rxrpc.o \
security.o \
server.o \
+ server_list.o \
super.o \
netdevices.o \
vlclient.o \
- vlocation.o \
- vnode.o \
volume.o \
write.o \
xattr.o
return alist;
}
+/*
+ * Merge an IPv4 entry into a fileserver address list.
+ */
+void afs_merge_fs_addr4(struct afs_addr_list *alist, __be32 xdr)
+{
+ struct sockaddr_in6 *a;
+ int i;
+
+ for (i = 0; i < alist->nr_ipv4; i++) {
+ a = &alist->addrs[i].transport.sin6;
+ if (xdr == a->sin6_addr.s6_addr32[3])
+ return;
+ if (xdr < a->sin6_addr.s6_addr32[3])
+ break;
+ }
+
+ if (i < alist->nr_addrs)
+ memmove(alist->addrs + i + 1,
+ alist->addrs + i,
+ sizeof(alist->addrs[0]) * (alist->nr_addrs - i));
+
+ a = &alist->addrs[i].transport.sin6;
+ a->sin6_port = htons(AFS_FS_PORT);
+ a->sin6_addr.s6_addr32[0] = 0;
+ a->sin6_addr.s6_addr32[1] = 0;
+ a->sin6_addr.s6_addr32[2] = htonl(0xffff);
+ a->sin6_addr.s6_addr32[3] = xdr;
+ alist->nr_ipv4++;
+ alist->nr_addrs++;
+}
+
/*
* Get an address to try.
*/
FSFETCHDATA64 = 65537, /* AFS Fetch file data */
FSSTOREDATA64 = 65538, /* AFS Store file data */
FSGIVEUPALLCALLBACKS = 65539, /* AFS Give up all outstanding callbacks on a server */
+ FSGETCAPABILITIES = 65540, /* Probe and get the capabilities of a fileserver */
};
enum AFS_FS_Errors {
#define AFS_VLDB_MAXNAMELEN 65
+
+struct afs_ListAddrByAttributes__xdr {
+ __be32 Mask;
+#define AFS_VLADDR_IPADDR 0x1 /* Match by ->ipaddr */
+#define AFS_VLADDR_INDEX 0x2 /* Match by ->index */
+#define AFS_VLADDR_UUID 0x4 /* Match by ->uuid */
+ __be32 ipaddr;
+ __be32 index;
+ __be32 spare;
+ struct afs_uuid__xdr uuid;
+};
+
+struct afs_uvldbentry__xdr {
+ __be32 name[AFS_VLDB_MAXNAMELEN];
+ __be32 nServers;
+ struct afs_uuid__xdr serverNumber[AFS_NMAXNSERVERS];
+ __be32 serverUnique[AFS_NMAXNSERVERS];
+ __be32 serverPartition[AFS_NMAXNSERVERS];
+ __be32 serverFlags[AFS_NMAXNSERVERS];
+ __be32 volumeId[AFS_MAXTYPES];
+ __be32 cloneId;
+ __be32 flags;
+ __be32 spares1;
+ __be32 spares2;
+ __be32 spares3;
+ __be32 spares4;
+ __be32 spares5;
+ __be32 spares6;
+ __be32 spares7;
+ __be32 spares8;
+ __be32 spares9;
+};
+
+struct afs_address_list {
+ refcount_t usage;
+ unsigned int version;
+ unsigned int nr_addrs;
+ struct sockaddr_rxrpc addrs[];
+};
+
+extern void afs_put_address_list(struct afs_address_list *alist);
+
#endif /* AFS_VL_H */
* - Called with volume->server_sem held.
*/
int afs_register_server_cb_interest(struct afs_vnode *vnode,
- struct afs_cb_interest **ppcbi,
- struct afs_server *server)
+ struct afs_server_entry *entry)
{
- struct afs_cb_interest *cbi = *ppcbi, *vcbi, *new, *x;
+ struct afs_cb_interest *cbi = entry->cb_interest, *vcbi, *new, *x;
+ struct afs_server *server = entry->server;
again:
vcbi = vnode->cb_interest;
if (!cbi && vcbi->server == server) {
afs_get_cb_interest(vcbi);
- x = cmpxchg(ppcbi, cbi, vcbi);
+ x = cmpxchg(&entry->cb_interest, cbi, vcbi);
if (x != cbi) {
cbi = x;
afs_put_cb_interest(afs_v2net(vnode), vcbi);
list_add_tail(&new->cb_link, &server->cb_interests);
write_unlock(&server->cb_break_lock);
- x = cmpxchg(ppcbi, cbi, new);
+ x = cmpxchg(&entry->cb_interest, cbi, new);
if (x == cbi) {
cbi = new;
} else {
*/
void afs_init_callback_state(struct afs_server *server)
{
- if (!test_and_clear_bit(AFS_SERVER_NEW, &server->flags))
+ if (!test_and_clear_bit(AFS_SERVER_FL_NEW, &server->flags))
server->cb_s_break++;
}
/*
* Clear the callback interests in a server list.
*/
-void afs_clear_callback_interests(struct afs_net *net, struct afs_volume *volume)
+void afs_clear_callback_interests(struct afs_net *net, struct afs_server_list *slist)
{
int i;
- for (i = 0; i < ARRAY_SIZE(volume->cb_interests); i++) {
- afs_put_cb_interest(net, volume->cb_interests[i]);
- volume->cb_interests[i] = NULL;
+ for (i = 0; i < slist->nr_servers; i++) {
+ afs_put_cb_interest(net, slist->servers[i].cb_interest);
+ slist->servers[i].cb_interest = NULL;
}
}
atomic_set(&cell->usage, 2);
INIT_WORK(&cell->manager, afs_manage_cell);
- rwlock_init(&cell->servers_lock);
- INIT_LIST_HEAD(&cell->servers);
- init_rwsem(&cell->vl_sem);
- INIT_LIST_HEAD(&cell->vl_list);
- spin_lock_init(&cell->vl_lock);
cell->flags = ((1 << AFS_CELL_FL_NOT_READY) |
(1 << AFS_CELL_FL_NO_LOOKUP_YET));
+ INIT_LIST_HEAD(&cell->proc_volumes);
+ rwlock_init(&cell->proc_lock);
rwlock_init(&cell->vl_addrs_lock);
/* Fill in the VL server list if we were given a list of addresses to
dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version;
/* instantiate the dentry */
- inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL);
+ inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL, NULL);
key_put(key);
if (IS_ERR(inode)) {
_leave(" = %ld", PTR_ERR(inode));
_enter("%pd", dentry);
}
+/*
+ * Create a new inode for create/mkdir/symlink
+ */
+static void afs_vnode_new_inode(struct afs_fs_cursor *fc,
+ struct dentry *new_dentry,
+ struct afs_fid *newfid,
+ struct afs_file_status *newstatus,
+ struct afs_callback *newcb)
+{
+ struct inode *inode;
+
+ if (fc->ac.error < 0)
+ return;
+
+ inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key,
+ newfid, newstatus, newcb, fc->cbi);
+ if (IS_ERR(inode)) {
+ /* ENOMEM or EINTR at a really inconvenient time - just abandon
+ * the new directory on the server.
+ */
+ fc->ac.error = PTR_ERR(inode);
+ return;
+ }
+
+ d_instantiate(new_dentry, inode);
+ if (d_unhashed(new_dentry))
+ d_rehash(new_dentry);
+}
+
/*
* create a directory on an AFS filesystem
*/
static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
- struct afs_file_status status;
- struct afs_callback cb;
- struct afs_server *server;
- struct afs_vnode *dvnode, *vnode;
- struct afs_fid fid;
- struct inode *inode;
+ struct afs_file_status newstatus;
+ struct afs_fs_cursor fc;
+ struct afs_callback newcb;
+ struct afs_vnode *dvnode = AFS_FS_I(dir);
+ struct afs_fid newfid;
struct key *key;
int ret;
- dvnode = AFS_FS_I(dir);
+ mode |= S_IFDIR;
_enter("{%x:%u},{%pd},%ho",
dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
goto error;
}
- mode |= S_IFDIR;
- ret = afs_vnode_create(dvnode, key, dentry->d_name.name,
- mode, &fid, &status, &cb, &server);
- if (ret < 0)
- goto mkdir_error;
+ ret = -ERESTARTSYS;
+ if (afs_begin_vnode_operation(&fc, dvnode, key)) {
+ while (afs_select_fileserver(&fc)) {
+ fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
+ afs_fs_create(&fc, dentry->d_name.name, mode,
+ &newfid, &newstatus, &newcb);
+ }
- inode = afs_iget(dir->i_sb, key, &fid, &status, &cb);
- if (IS_ERR(inode)) {
- /* ENOMEM at a really inconvenient time - just abandon the new
- * directory on the server */
- ret = PTR_ERR(inode);
- goto iget_error;
+ afs_check_for_remote_deletion(&fc, fc.vnode);
+ afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
+ afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb);
+ ret = afs_end_vnode_operation(&fc);
+ if (ret < 0)
+ goto error_key;
}
- /* apply the status report we've got for the new vnode */
- vnode = AFS_FS_I(inode);
- spin_lock(&vnode->lock);
- vnode->update_cnt++;
- spin_unlock(&vnode->lock);
- afs_vnode_finalise_status_update(vnode, server);
- afs_put_server(afs_i2net(dir), server);
-
- d_instantiate(dentry, inode);
- if (d_unhashed(dentry)) {
- _debug("not hashed");
- d_rehash(dentry);
- }
key_put(key);
_leave(" = 0");
return 0;
-iget_error:
- afs_put_server(afs_i2net(dir), server);
-mkdir_error:
+error_key:
key_put(key);
error:
d_drop(dentry);
return ret;
}
+/*
+ * Remove a subdir from a directory.
+ */
+static void afs_dir_remove_subdir(struct dentry *dentry)
+{
+ if (d_really_is_positive(dentry)) {
+ struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
+
+ clear_nlink(&vnode->vfs_inode);
+ set_bit(AFS_VNODE_DELETED, &vnode->flags);
+ clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
+ }
+}
+
/*
* remove a directory from an AFS filesystem
*/
static int afs_rmdir(struct inode *dir, struct dentry *dentry)
{
- struct afs_vnode *dvnode, *vnode;
+ struct afs_fs_cursor fc;
+ struct afs_vnode *dvnode = AFS_FS_I(dir);
struct key *key;
int ret;
- dvnode = AFS_FS_I(dir);
-
_enter("{%x:%u},{%pd}",
dvnode->fid.vid, dvnode->fid.vnode, dentry);
goto error;
}
- ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true);
- if (ret < 0)
- goto rmdir_error;
+ ret = -ERESTARTSYS;
+ if (afs_begin_vnode_operation(&fc, dvnode, key)) {
+ while (afs_select_fileserver(&fc)) {
+ fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
+ afs_fs_remove(&fc, dentry->d_name.name, true);
+ }
- if (d_really_is_positive(dentry)) {
- vnode = AFS_FS_I(d_inode(dentry));
- clear_nlink(&vnode->vfs_inode);
- set_bit(AFS_VNODE_DELETED, &vnode->flags);
- clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
+ afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
+ ret = afs_end_vnode_operation(&fc);
+ if (ret == 0)
+ afs_dir_remove_subdir(dentry);
}
key_put(key);
- _leave(" = 0");
- return 0;
-
-rmdir_error:
- key_put(key);
error:
- _leave(" = %d", ret);
return ret;
}
/*
- * remove a file from an AFS filesystem
+ * Remove a link to a file or symlink from a directory.
+ *
+ * If the file was not deleted due to excess hard links, the fileserver will
+ * break the callback promise on the file - if it had one - before it returns
+ * to us, and if it was deleted, it won't
+ *
+ * However, if we didn't have a callback promise outstanding, or it was
+ * outstanding on a different server, then it won't break it either...
+ */
+static int afs_dir_remove_link(struct dentry *dentry, struct key *key)
+{
+ int ret = 0;
+
+ if (d_really_is_positive(dentry)) {
+ struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
+
+ if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
+ kdebug("AFS_VNODE_DELETED");
+ clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
+
+ ret = afs_validate(vnode, key);
+ if (ret == -ESTALE)
+ ret = 0;
+ _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret);
+ }
+
+ return ret;
+}
+
+/*
+ * Remove a file or symlink from an AFS filesystem.
*/
static int afs_unlink(struct inode *dir, struct dentry *dentry)
{
- struct afs_vnode *dvnode, *vnode;
+ struct afs_fs_cursor fc;
+ struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
struct key *key;
int ret;
- dvnode = AFS_FS_I(dir);
-
_enter("{%x:%u},{%pd}",
dvnode->fid.vid, dvnode->fid.vnode, dentry);
- ret = -ENAMETOOLONG;
if (dentry->d_name.len >= AFSNAMEMAX)
- goto error;
+ return -ENAMETOOLONG;
key = afs_request_key(dvnode->volume->cell);
if (IS_ERR(key)) {
goto error;
}
+ /* Try to make sure we have a callback promise on the victim. */
if (d_really_is_positive(dentry)) {
vnode = AFS_FS_I(d_inode(dentry));
-
- /* make sure we have a callback promise on the victim */
ret = afs_validate(vnode, key);
if (ret < 0)
- goto error;
+ goto error_key;
}
- ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false);
- if (ret < 0)
- goto remove_error;
+ ret = -ERESTARTSYS;
+ if (afs_begin_vnode_operation(&fc, dvnode, key)) {
+ while (afs_select_fileserver(&fc)) {
+ fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
+ afs_fs_remove(&fc, dentry->d_name.name, false);
+ }
- if (d_really_is_positive(dentry)) {
- /* if the file wasn't deleted due to excess hard links, the
- * fileserver will break the callback promise on the file - if
- * it had one - before it returns to us, and if it was deleted,
- * it won't
- *
- * however, if we didn't have a callback promise outstanding,
- * or it was outstanding on a different server, then it won't
- * break it either...
- */
- vnode = AFS_FS_I(d_inode(dentry));
- if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
- _debug("AFS_VNODE_DELETED");
- clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
- ret = afs_validate(vnode, key);
- _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret);
+ afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
+ ret = afs_end_vnode_operation(&fc);
+ if (ret == 0)
+ ret = afs_dir_remove_link(dentry, key);
}
- key_put(key);
- _leave(" = 0");
- return 0;
-
-remove_error:
+error_key:
key_put(key);
error:
_leave(" = %d", ret);
static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
bool excl)
{
- struct afs_file_status status;
- struct afs_callback cb;
- struct afs_server *server;
- struct afs_vnode *dvnode, *vnode;
- struct afs_fid fid;
- struct inode *inode;
+ struct afs_fs_cursor fc;
+ struct afs_file_status newstatus;
+ struct afs_callback newcb;
+ struct afs_vnode *dvnode = dvnode = AFS_FS_I(dir);
+ struct afs_fid newfid;
struct key *key;
int ret;
- dvnode = AFS_FS_I(dir);
+ mode |= S_IFREG;
_enter("{%x:%u},{%pd},%ho,",
dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
+ ret = -ENAMETOOLONG;
+ if (dentry->d_name.len >= AFSNAMEMAX)
+ goto error;
+
key = afs_request_key(dvnode->volume->cell);
if (IS_ERR(key)) {
ret = PTR_ERR(key);
goto error;
}
- mode |= S_IFREG;
- ret = afs_vnode_create(dvnode, key, dentry->d_name.name,
- mode, &fid, &status, &cb, &server);
- if (ret < 0)
- goto create_error;
+ ret = -ERESTARTSYS;
+ if (afs_begin_vnode_operation(&fc, dvnode, key)) {
+ while (afs_select_fileserver(&fc)) {
+ fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
+ afs_fs_create(&fc, dentry->d_name.name, mode,
+ &newfid, &newstatus, &newcb);
+ }
- inode = afs_iget(dir->i_sb, key, &fid, &status, &cb);
- if (IS_ERR(inode)) {
- /* ENOMEM at a really inconvenient time - just abandon the new
- * directory on the server */
- ret = PTR_ERR(inode);
- goto iget_error;
+ afs_check_for_remote_deletion(&fc, fc.vnode);
+ afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
+ afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb);
+ ret = afs_end_vnode_operation(&fc);
+ if (ret < 0)
+ goto error_key;
}
- /* apply the status report we've got for the new vnode */
- vnode = AFS_FS_I(inode);
- spin_lock(&vnode->lock);
- vnode->update_cnt++;
- spin_unlock(&vnode->lock);
- afs_vnode_finalise_status_update(vnode, server);
- afs_put_server(afs_i2net(dir), server);
-
- d_instantiate(dentry, inode);
- if (d_unhashed(dentry)) {
- _debug("not hashed");
- d_rehash(dentry);
- }
key_put(key);
_leave(" = 0");
return 0;
-iget_error:
- afs_put_server(afs_i2net(dir), server);
-create_error:
+error_key:
key_put(key);
error:
d_drop(dentry);
static int afs_link(struct dentry *from, struct inode *dir,
struct dentry *dentry)
{
+ struct afs_fs_cursor fc;
struct afs_vnode *dvnode, *vnode;
struct key *key;
int ret;
dvnode->fid.vid, dvnode->fid.vnode,
dentry);
+ ret = -ENAMETOOLONG;
+ if (dentry->d_name.len >= AFSNAMEMAX)
+ goto error;
+
key = afs_request_key(dvnode->volume->cell);
if (IS_ERR(key)) {
ret = PTR_ERR(key);
goto error;
}
- ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name);
- if (ret < 0)
- goto link_error;
+ ret = -ERESTARTSYS;
+ if (afs_begin_vnode_operation(&fc, dvnode, key)) {
+ if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) {
+ afs_end_vnode_operation(&fc);
+ return -ERESTARTSYS;
+ }
+
+ while (afs_select_fileserver(&fc)) {
+ fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
+ fc.cb_break_2 = vnode->cb_break + vnode->cb_s_break;
+ afs_fs_link(&fc, vnode, dentry->d_name.name);
+ }
+
+ afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
+ afs_vnode_commit_status(&fc, vnode, fc.cb_break_2);
+ ihold(&vnode->vfs_inode);
+ d_instantiate(dentry, &vnode->vfs_inode);
+
+ mutex_unlock(&vnode->io_lock);
+ ret = afs_end_vnode_operation(&fc);
+ if (ret < 0)
+ goto error_key;
+ }
- ihold(&vnode->vfs_inode);
- d_instantiate(dentry, &vnode->vfs_inode);
key_put(key);
_leave(" = 0");
return 0;
-link_error:
+error_key:
key_put(key);
error:
d_drop(dentry);
static int afs_symlink(struct inode *dir, struct dentry *dentry,
const char *content)
{
- struct afs_file_status status;
- struct afs_server *server;
- struct afs_vnode *dvnode, *vnode;
- struct afs_fid fid;
- struct inode *inode;
+ struct afs_fs_cursor fc;
+ struct afs_file_status newstatus;
+ struct afs_vnode *dvnode = AFS_FS_I(dir);
+ struct afs_fid newfid;
struct key *key;
int ret;
- dvnode = AFS_FS_I(dir);
-
_enter("{%x:%u},{%pd},%s",
dvnode->fid.vid, dvnode->fid.vnode, dentry,
content);
+ ret = -ENAMETOOLONG;
+ if (dentry->d_name.len >= AFSNAMEMAX)
+ goto error;
+
ret = -EINVAL;
if (strlen(content) >= AFSPATHMAX)
goto error;
goto error;
}
- ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content,
- &fid, &status, &server);
- if (ret < 0)
- goto create_error;
+ ret = -ERESTARTSYS;
+ if (afs_begin_vnode_operation(&fc, dvnode, key)) {
+ while (afs_select_fileserver(&fc)) {
+ fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
+ afs_fs_symlink(&fc, dentry->d_name.name, content,
+ &newfid, &newstatus);
+ }
- inode = afs_iget(dir->i_sb, key, &fid, &status, NULL);
- if (IS_ERR(inode)) {
- /* ENOMEM at a really inconvenient time - just abandon the new
- * directory on the server */
- ret = PTR_ERR(inode);
- goto iget_error;
+ afs_check_for_remote_deletion(&fc, fc.vnode);
+ afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
+ afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL);
+ ret = afs_end_vnode_operation(&fc);
+ if (ret < 0)
+ goto error_key;
}
- /* apply the status report we've got for the new vnode */
- vnode = AFS_FS_I(inode);
- spin_lock(&vnode->lock);
- vnode->update_cnt++;
- spin_unlock(&vnode->lock);
- afs_vnode_finalise_status_update(vnode, server);
- afs_put_server(afs_i2net(dir), server);
-
- d_instantiate(dentry, inode);
- if (d_unhashed(dentry)) {
- _debug("not hashed");
- d_rehash(dentry);
- }
key_put(key);
_leave(" = 0");
return 0;
-iget_error:
- afs_put_server(afs_i2net(dir), server);
-create_error:
+error_key:
key_put(key);
error:
d_drop(dentry);
struct inode *new_dir, struct dentry *new_dentry,
unsigned int flags)
{
+ struct afs_fs_cursor fc;
struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
struct key *key;
int ret;
goto error;
}
- ret = afs_vnode_rename(orig_dvnode, new_dvnode, key,
- old_dentry->d_name.name,
- new_dentry->d_name.name);
- if (ret < 0)
- goto rename_error;
+ ret = -ERESTARTSYS;
+ if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) {
+ if (orig_dvnode != new_dvnode) {
+ if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) {
+ afs_end_vnode_operation(&fc);
+ return -ERESTARTSYS;
+ }
+ }
+ while (afs_select_fileserver(&fc)) {
+ fc.cb_break = orig_dvnode->cb_break + orig_dvnode->cb_s_break;
+ fc.cb_break_2 = new_dvnode->cb_break + new_dvnode->cb_s_break;
+ afs_fs_rename(&fc, old_dentry->d_name.name,
+ new_dvnode, new_dentry->d_name.name);
+ }
+
+ afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break);
+ afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2);
+ if (orig_dvnode != new_dvnode)
+ mutex_unlock(&new_dvnode->io_lock);
+ ret = afs_end_vnode_operation(&fc);
+ if (ret < 0)
+ goto error_key;
+ }
+
key_put(key);
_leave(" = 0");
return 0;
-rename_error:
+error_key:
key_put(key);
error:
d_drop(new_dentry);
}
#endif
+/*
+ * Fetch file data from the volume.
+ */
+int afs_fetch_data(struct afs_vnode *vnode, struct key *key, struct afs_read *desc)
+{
+ struct afs_fs_cursor fc;
+ int ret;
+
+ _enter("%s{%x:%u.%u},%x,,,",
+ vnode->volume->name,
+ vnode->fid.vid,
+ vnode->fid.vnode,
+ vnode->fid.unique,
+ key_serial(key));
+
+ ret = -ERESTARTSYS;
+ if (afs_begin_vnode_operation(&fc, vnode, key)) {
+ while (afs_select_fileserver(&fc)) {
+ fc.cb_break = vnode->cb_break + vnode->cb_s_break;
+ afs_fs_fetch_data(&fc, desc);
+ }
+
+ afs_check_for_remote_deletion(&fc, fc.vnode);
+ afs_vnode_commit_status(&fc, vnode, fc.cb_break);
+ ret = afs_end_vnode_operation(&fc);
+ }
+
+ _leave(" = %d", ret);
+ return ret;
+}
+
/*
* read page from file, directory or symlink, given a key to use
*/
/* read the contents of the file from the server into the
* page */
- ret = afs_vnode_fetch_data(vnode, key, req);
+ ret = afs_fetch_data(vnode, key, req);
afs_put_read(req);
if (ret < 0) {
if (ret == -ENOENT) {
ret = afs_page_filler(key, page);
} else {
struct inode *inode = page->mapping->host;
- key = afs_request_key(AFS_FS_S(inode->i_sb)->volume->cell);
+ key = afs_request_key(AFS_FS_S(inode->i_sb)->cell);
if (IS_ERR(key)) {
ret = PTR_ERR(key);
} else {
return 0;
}
- ret = afs_vnode_fetch_data(vnode, key, req);
+ ret = afs_fetch_data(vnode, key, req);
if (ret < 0)
goto error;
}
}
+/*
+ * Get a lock on a file
+ */
+static int afs_set_lock(struct afs_vnode *vnode, struct key *key,
+ afs_lock_type_t type)
+{
+ struct afs_fs_cursor fc;
+ int ret;
+
+ _enter("%s{%x:%u.%u},%x,%u",
+ vnode->volume->name,
+ vnode->fid.vid,
+ vnode->fid.vnode,
+ vnode->fid.unique,
+ key_serial(key), type);
+
+ ret = -ERESTARTSYS;
+ if (afs_begin_vnode_operation(&fc, vnode, key)) {
+ while (afs_select_fileserver(&fc)) {
+ fc.cb_break = vnode->cb_break + vnode->cb_s_break;
+ afs_fs_set_lock(&fc, type);
+ }
+
+ afs_check_for_remote_deletion(&fc, fc.vnode);
+ afs_vnode_commit_status(&fc, vnode, fc.cb_break);
+ ret = afs_end_vnode_operation(&fc);
+ }
+
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * Extend a lock on a file
+ */
+static int afs_extend_lock(struct afs_vnode *vnode, struct key *key)
+{
+ struct afs_fs_cursor fc;
+ int ret;
+
+ _enter("%s{%x:%u.%u},%x",
+ vnode->volume->name,
+ vnode->fid.vid,
+ vnode->fid.vnode,
+ vnode->fid.unique,
+ key_serial(key));
+
+ ret = -ERESTARTSYS;
+ if (afs_begin_vnode_operation(&fc, vnode, key)) {
+ while (afs_select_current_fileserver(&fc)) {
+ fc.cb_break = vnode->cb_break + vnode->cb_s_break;
+ afs_fs_extend_lock(&fc);
+ }
+
+ afs_check_for_remote_deletion(&fc, fc.vnode);
+ afs_vnode_commit_status(&fc, vnode, fc.cb_break);
+ ret = afs_end_vnode_operation(&fc);
+ }
+
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * Release a lock on a file
+ */
+static int afs_release_lock(struct afs_vnode *vnode, struct key *key)
+{
+ struct afs_fs_cursor fc;
+ int ret;
+
+ _enter("%s{%x:%u.%u},%x",
+ vnode->volume->name,
+ vnode->fid.vid,
+ vnode->fid.vnode,
+ vnode->fid.unique,
+ key_serial(key));
+
+ ret = -ERESTARTSYS;
+ if (afs_begin_vnode_operation(&fc, vnode, key)) {
+ while (afs_select_current_fileserver(&fc)) {
+ fc.cb_break = vnode->cb_break + vnode->cb_s_break;
+ afs_fs_release_lock(&fc);
+ }
+
+ afs_check_for_remote_deletion(&fc, fc.vnode);
+ afs_vnode_commit_status(&fc, vnode, fc.cb_break);
+ ret = afs_end_vnode_operation(&fc);
+ }
+
+ _leave(" = %d", ret);
+ return ret;
+}
+
/*
* do work for a lock, including:
* - probing for a lock we're waiting on but didn't get immediately
/* attempt to release the server lock; if it fails, we just
* wait 5 minutes and it'll time out anyway */
- ret = afs_vnode_release_lock(vnode, vnode->unlock_key);
+ ret = afs_release_lock(vnode, vnode->unlock_key);
if (ret < 0)
printk(KERN_WARNING "AFS:"
" Failed to release lock on {%x:%x} error %d\n",
key = key_get(fl->fl_file->private_data);
spin_unlock(&vnode->lock);
- ret = afs_vnode_extend_lock(vnode, key);
+ ret = afs_extend_lock(vnode, key);
clear_bit(AFS_VNODE_LOCKING, &vnode->flags);
key_put(key);
switch (ret) {
AFS_LOCK_READ : AFS_LOCK_WRITE;
spin_unlock(&vnode->lock);
- ret = afs_vnode_set_lock(vnode, key, type);
+ ret = afs_set_lock(vnode, key, type);
clear_bit(AFS_VNODE_LOCKING, &vnode->flags);
switch (ret) {
case -EWOULDBLOCK:
clear_bit(AFS_VNODE_READLOCKED, &vnode->flags);
clear_bit(AFS_VNODE_WRITELOCKED, &vnode->flags);
spin_unlock(&vnode->lock);
- afs_vnode_release_lock(vnode, key);
+ afs_release_lock(vnode, key);
if (!list_empty(&vnode->pending_locks))
afs_lock_may_be_available(vnode);
}
set_bit(AFS_VNODE_LOCKING, &vnode->flags);
spin_unlock(&vnode->lock);
- ret = afs_vnode_set_lock(vnode, key, type);
+ ret = afs_set_lock(vnode, key, type);
clear_bit(AFS_VNODE_LOCKING, &vnode->flags);
switch (ret) {
case 0:
/* again, make sure we've got a callback on this file and, again, make
* sure that our view of the data version is up to date (we ignore
* errors incurred here and deal with the consequences elsewhere) */
- afs_vnode_fetch_status(vnode, key, false);
+ afs_validate(vnode, key);
error:
spin_unlock(&inode->i_lock);
posix_test_lock(file, fl);
if (fl->fl_type == F_UNLCK) {
/* no local locks; consult the server */
- ret = afs_vnode_fetch_status(vnode, key, true);
+ ret = afs_fetch_status(vnode, key);
if (ret < 0)
goto error;
lock_count = vnode->status.lock_count;
*/
static u8 afs_discard_buffer[64];
-static inline void afs_use_fs_server(struct afs_call *call, struct afs_server *server)
+static inline void afs_use_fs_server(struct afs_call *call, struct afs_cb_interest *cbi)
{
- call->server = afs_get_server(server);
+ call->cbi = afs_get_cb_interest(cbi);
}
/*
kuid_t owner;
kgid_t group;
- write_seqlock(&vnode->cb_lock);
+ if (vnode)
+ write_seqlock(&vnode->cb_lock);
#define EXTRACT(DST) \
do { \
status->data_version = data_version;
}
- write_sequnlock(&vnode->cb_lock);
+ if (vnode)
+ write_sequnlock(&vnode->cb_lock);
}
/*
struct afs_vnode *vnode,
const __be32 **_bp)
{
+ struct afs_cb_interest *old, *cbi = call->cbi;
const __be32 *bp = *_bp;
u32 cb_expiry;
write_seqlock(&vnode->cb_lock);
- if (call->cb_break == (vnode->cb_break + call->server->cb_s_break)) {
+ if (call->cb_break == (vnode->cb_break + cbi->server->cb_s_break)) {
vnode->cb_version = ntohl(*bp++);
cb_expiry = ntohl(*bp++);
vnode->cb_type = ntohl(*bp++);
vnode->cb_expires_at = cb_expiry + ktime_get_real_seconds();
+ old = vnode->cb_interest;
+ if (old != call->cbi) {
+ vnode->cb_interest = cbi;
+ cbi = old;
+ }
set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
} else {
bp += 3;
}
write_sequnlock(&vnode->cb_lock);
+ call->cbi = cbi;
*_bp = bp;
}
/*
* fetch the status information for a file
*/
-int afs_fs_fetch_file_status(struct afs_fs_cursor *fc,
- struct key *key,
- struct afs_vnode *vnode,
- struct afs_volsync *volsync,
- bool async)
+int afs_fs_fetch_file_status(struct afs_fs_cursor *fc, struct afs_volsync *volsync)
{
+ struct afs_vnode *vnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(vnode);
__be32 *bp;
_enter(",%x,{%x:%u},,",
- key_serial(key), vnode->fid.vid, vnode->fid.vnode);
+ key_serial(fc->key), vnode->fid.vid, vnode->fid.vnode);
call = afs_alloc_flat_call(net, &afs_RXFSFetchStatus, 16, (21 + 3 + 6) * 4);
- if (!call)
+ if (!call) {
+ fc->ac.error = -ENOMEM;
return -ENOMEM;
+ }
- call->key = key;
+ call->key = fc->key;
call->reply[0] = vnode;
call->reply[1] = volsync;
bp[2] = htonl(vnode->fid.vnode);
bp[3] = htonl(vnode->fid.unique);
- call->cb_break = vnode->cb_break + fc->server->cb_s_break;
- afs_use_fs_server(call, fc->server);
- return afs_make_call(&fc->ac, call, GFP_NOFS, async);
+ call->cb_break = fc->cb_break;
+ afs_use_fs_server(call, fc->cbi);
+ return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}
/*
/*
* fetch data from a very large file
*/
-static int afs_fs_fetch_data64(struct afs_fs_cursor *fc,
- struct key *key,
- struct afs_vnode *vnode,
- struct afs_read *req,
- bool async)
+static int afs_fs_fetch_data64(struct afs_fs_cursor *fc, struct afs_read *req)
{
+ struct afs_vnode *vnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(vnode);
__be32 *bp;
if (!call)
return -ENOMEM;
- call->key = key;
+ call->key = fc->key;
call->reply[0] = vnode;
call->reply[1] = NULL; /* volsync */
call->reply[2] = req;
bp[7] = htonl(lower_32_bits(req->len));
atomic_inc(&req->usage);
- call->cb_break = vnode->cb_break + fc->server->cb_s_break;
- afs_use_fs_server(call, fc->server);
- return afs_make_call(&fc->ac, call, GFP_NOFS, async);
+ call->cb_break = fc->cb_break;
+ afs_use_fs_server(call, fc->cbi);
+ return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}
/*
* fetch data from a file
*/
-int afs_fs_fetch_data(struct afs_fs_cursor *fc,
- struct key *key,
- struct afs_vnode *vnode,
- struct afs_read *req,
- bool async)
+int afs_fs_fetch_data(struct afs_fs_cursor *fc, struct afs_read *req)
{
+ struct afs_vnode *vnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(vnode);
__be32 *bp;
if (upper_32_bits(req->pos) ||
upper_32_bits(req->len) ||
upper_32_bits(req->pos + req->len))
- return afs_fs_fetch_data64(fc, key, vnode, req, async);
+ return afs_fs_fetch_data64(fc, req);
_enter("");
if (!call)
return -ENOMEM;
- call->key = key;
+ call->key = fc->key;
call->reply[0] = vnode;
call->reply[1] = NULL; /* volsync */
call->reply[2] = req;
bp[5] = htonl(lower_32_bits(req->len));
atomic_inc(&req->usage);
- call->cb_break = vnode->cb_break + fc->server->cb_s_break;
- afs_use_fs_server(call, fc->server);
- return afs_make_call(&fc->ac, call, GFP_NOFS, async);
+ call->cb_break = fc->cb_break;
+ afs_use_fs_server(call, fc->cbi);
+ return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}
/*
* create a file or make a directory
*/
int afs_fs_create(struct afs_fs_cursor *fc,
- struct key *key,
- struct afs_vnode *vnode,
const char *name,
umode_t mode,
struct afs_fid *newfid,
struct afs_file_status *newstatus,
- struct afs_callback *newcb,
- bool async)
+ struct afs_callback *newcb)
{
+ struct afs_vnode *vnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(vnode);
size_t namesz, reqsz, padsz;
if (!call)
return -ENOMEM;
- call->key = key;
+ call->key = fc->key;
call->reply[0] = vnode;
call->reply[1] = newfid;
call->reply[2] = newstatus;
*bp++ = htonl(mode & S_IALLUGO); /* unix mode */
*bp++ = 0; /* segment size */
- afs_use_fs_server(call, fc->server);
- return afs_make_call(&fc->ac, call, GFP_NOFS, async);
+ afs_use_fs_server(call, fc->cbi);
+ return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}
/*
/*
* remove a file or directory
*/
-int afs_fs_remove(struct afs_fs_cursor *fc,
- struct key *key,
- struct afs_vnode *vnode,
- const char *name,
- bool isdir,
- bool async)
+int afs_fs_remove(struct afs_fs_cursor *fc, const char *name, bool isdir)
{
+ struct afs_vnode *vnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(vnode);
size_t namesz, reqsz, padsz;
if (!call)
return -ENOMEM;
- call->key = key;
+ call->key = fc->key;
call->reply[0] = vnode;
/* marshall the parameters */
bp = (void *) bp + padsz;
}
- afs_use_fs_server(call, fc->server);
- return afs_make_call(&fc->ac, call, GFP_NOFS, async);
+ afs_use_fs_server(call, fc->cbi);
+ return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}
/*
/*
* make a hard link
*/
-int afs_fs_link(struct afs_fs_cursor *fc,
- struct key *key,
- struct afs_vnode *dvnode,
- struct afs_vnode *vnode,
- const char *name,
- bool async)
+int afs_fs_link(struct afs_fs_cursor *fc, struct afs_vnode *vnode,
+ const char *name)
{
+ struct afs_vnode *dvnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(vnode);
size_t namesz, reqsz, padsz;
if (!call)
return -ENOMEM;
- call->key = key;
+ call->key = fc->key;
call->reply[0] = dvnode;
call->reply[1] = vnode;
*bp++ = htonl(vnode->fid.vnode);
*bp++ = htonl(vnode->fid.unique);
- afs_use_fs_server(call, fc->server);
- return afs_make_call(&fc->ac, call, GFP_NOFS, async);
+ afs_use_fs_server(call, fc->cbi);
+ return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}
/*
* create a symbolic link
*/
int afs_fs_symlink(struct afs_fs_cursor *fc,
- struct key *key,
- struct afs_vnode *vnode,
const char *name,
const char *contents,
struct afs_fid *newfid,
- struct afs_file_status *newstatus,
- bool async)
+ struct afs_file_status *newstatus)
{
+ struct afs_vnode *vnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(vnode);
size_t namesz, reqsz, padsz, c_namesz, c_padsz;
if (!call)
return -ENOMEM;
- call->key = key;
+ call->key = fc->key;
call->reply[0] = vnode;
call->reply[1] = newfid;
call->reply[2] = newstatus;
*bp++ = htonl(S_IRWXUGO); /* unix mode */
*bp++ = 0; /* segment size */
- afs_use_fs_server(call, fc->server);
- return afs_make_call(&fc->ac, call, GFP_NOFS, async);
+ afs_use_fs_server(call, fc->cbi);
+ return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}
/*
* create a symbolic link
*/
int afs_fs_rename(struct afs_fs_cursor *fc,
- struct key *key,
- struct afs_vnode *orig_dvnode,
const char *orig_name,
struct afs_vnode *new_dvnode,
- const char *new_name,
- bool async)
+ const char *new_name)
{
+ struct afs_vnode *orig_dvnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(orig_dvnode);
size_t reqsz, o_namesz, o_padsz, n_namesz, n_padsz;
if (!call)
return -ENOMEM;
- call->key = key;
+ call->key = fc->key;
call->reply[0] = orig_dvnode;
call->reply[1] = new_dvnode;
bp = (void *) bp + n_padsz;
}
- afs_use_fs_server(call, fc->server);
- return afs_make_call(&fc->ac, call, GFP_NOFS, async);
+ afs_use_fs_server(call, fc->cbi);
+ return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}
/*
struct afs_writeback *wb,
pgoff_t first, pgoff_t last,
unsigned offset, unsigned to,
- loff_t size, loff_t pos, loff_t i_size,
- bool async)
+ loff_t size, loff_t pos, loff_t i_size)
{
struct afs_vnode *vnode = wb->vnode;
struct afs_call *call;
*bp++ = htonl(i_size >> 32);
*bp++ = htonl((u32) i_size);
- afs_use_fs_server(call, fc->server);
- return afs_make_call(&fc->ac, call, GFP_NOFS, async);
+ return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}
/*
*/
int afs_fs_store_data(struct afs_fs_cursor *fc, struct afs_writeback *wb,
pgoff_t first, pgoff_t last,
- unsigned offset, unsigned to,
- bool async)
+ unsigned offset, unsigned to)
{
struct afs_vnode *vnode = wb->vnode;
struct afs_call *call;
if (pos >> 32 || i_size >> 32 || size >> 32 || (pos + size) >> 32)
return afs_fs_store_data64(fc, wb, first, last, offset, to,
- size, pos, i_size, async);
+ size, pos, i_size);
call = afs_alloc_flat_call(net, &afs_RXFSStoreData,
(4 + 6 + 3) * 4,
*bp++ = htonl(size);
*bp++ = htonl(i_size);
- afs_use_fs_server(call, fc->server);
- return afs_make_call(&fc->ac, call, GFP_NOFS, async);
+ afs_use_fs_server(call, fc->cbi);
+ return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}
/*
* set the attributes on a very large file, using FS.StoreData rather than
* FS.StoreStatus so as to alter the file size also
*/
-static int afs_fs_setattr_size64(struct afs_fs_cursor *fc, struct key *key,
- struct afs_vnode *vnode, struct iattr *attr,
- bool async)
+static int afs_fs_setattr_size64(struct afs_fs_cursor *fc, struct iattr *attr)
{
+ struct afs_vnode *vnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(vnode);
__be32 *bp;
_enter(",%x,{%x:%u},,",
- key_serial(key), vnode->fid.vid, vnode->fid.vnode);
+ key_serial(fc->key), vnode->fid.vid, vnode->fid.vnode);
ASSERT(attr->ia_valid & ATTR_SIZE);
if (!call)
return -ENOMEM;
- call->key = key;
+ call->key = fc->key;
call->reply[0] = vnode;
call->store_version = vnode->status.data_version + 1;
call->operation_ID = FSSTOREDATA;
*bp++ = htonl(attr->ia_size >> 32); /* new file length */
*bp++ = htonl((u32) attr->ia_size);
- afs_use_fs_server(call, fc->server);
- return afs_make_call(&fc->ac, call, GFP_NOFS, async);
+ afs_use_fs_server(call, fc->cbi);
+ return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}
/*
* set the attributes on a file, using FS.StoreData rather than FS.StoreStatus
* so as to alter the file size also
*/
-static int afs_fs_setattr_size(struct afs_fs_cursor *fc, struct key *key,
- struct afs_vnode *vnode, struct iattr *attr,
- bool async)
+static int afs_fs_setattr_size(struct afs_fs_cursor *fc, struct iattr *attr)
{
+ struct afs_vnode *vnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(vnode);
__be32 *bp;
_enter(",%x,{%x:%u},,",
- key_serial(key), vnode->fid.vid, vnode->fid.vnode);
+ key_serial(fc->key), vnode->fid.vid, vnode->fid.vnode);
ASSERT(attr->ia_valid & ATTR_SIZE);
if (attr->ia_size >> 32)
- return afs_fs_setattr_size64(fc, key, vnode, attr, async);
+ return afs_fs_setattr_size64(fc, attr);
call = afs_alloc_flat_call(net, &afs_RXFSStoreData_as_Status,
(4 + 6 + 3) * 4,
if (!call)
return -ENOMEM;
- call->key = key;
+ call->key = fc->key;
call->reply[0] = vnode;
call->store_version = vnode->status.data_version + 1;
call->operation_ID = FSSTOREDATA;
*bp++ = 0; /* size of write */
*bp++ = htonl(attr->ia_size); /* new file length */
- afs_use_fs_server(call, fc->server);
- return afs_make_call(&fc->ac, call, GFP_NOFS, async);
+ afs_use_fs_server(call, fc->cbi);
+ return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}
/*
* set the attributes on a file, using FS.StoreData if there's a change in file
* size, and FS.StoreStatus otherwise
*/
-int afs_fs_setattr(struct afs_fs_cursor *fc, struct key *key,
- struct afs_vnode *vnode, struct iattr *attr,
- bool async)
+int afs_fs_setattr(struct afs_fs_cursor *fc, struct iattr *attr)
{
+ struct afs_vnode *vnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(vnode);
__be32 *bp;
if (attr->ia_valid & ATTR_SIZE)
- return afs_fs_setattr_size(fc, key, vnode, attr, async);
+ return afs_fs_setattr_size(fc, attr);
_enter(",%x,{%x:%u},,",
- key_serial(key), vnode->fid.vid, vnode->fid.vnode);
+ key_serial(fc->key), vnode->fid.vid, vnode->fid.vnode);
call = afs_alloc_flat_call(net, &afs_RXFSStoreStatus,
(4 + 6) * 4,
if (!call)
return -ENOMEM;
- call->key = key;
+ call->key = fc->key;
call->reply[0] = vnode;
call->operation_ID = FSSTORESTATUS;
xdr_encode_AFS_StoreStatus(&bp, attr);
- afs_use_fs_server(call, fc->server);
- return afs_make_call(&fc->ac, call, GFP_NOFS, async);
+ afs_use_fs_server(call, fc->cbi);
+ return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}
/*
* fetch the status of a volume
*/
int afs_fs_get_volume_status(struct afs_fs_cursor *fc,
- struct key *key,
- struct afs_vnode *vnode,
- struct afs_volume_status *vs,
- bool async)
+ struct afs_volume_status *vs)
{
+ struct afs_vnode *vnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(vnode);
__be32 *bp;
return -ENOMEM;
}
- call->key = key;
+ call->key = fc->key;
call->reply[0] = vnode;
call->reply[1] = vs;
call->reply[2] = tmpbuf;
bp[0] = htonl(FSGETVOLUMESTATUS);
bp[1] = htonl(vnode->fid.vid);
- afs_use_fs_server(call, fc->server);
- return afs_make_call(&fc->ac, call, GFP_NOFS, async);
+ afs_use_fs_server(call, fc->cbi);
+ return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}
/*
};
/*
- * get a lock on a file
+ * Set a lock on a file
*/
-int afs_fs_set_lock(struct afs_fs_cursor *fc,
- struct key *key,
- struct afs_vnode *vnode,
- afs_lock_type_t type,
- bool async)
+int afs_fs_set_lock(struct afs_fs_cursor *fc, afs_lock_type_t type)
{
+ struct afs_vnode *vnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(vnode);
__be32 *bp;
if (!call)
return -ENOMEM;
- call->key = key;
+ call->key = fc->key;
call->reply[0] = vnode;
/* marshall the parameters */
*bp++ = htonl(vnode->fid.unique);
*bp++ = htonl(type);
- afs_use_fs_server(call, fc->server);
- return afs_make_call(&fc->ac, call, GFP_NOFS, async);
+ afs_use_fs_server(call, fc->cbi);
+ return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}
/*
* extend a lock on a file
*/
-int afs_fs_extend_lock(struct afs_fs_cursor *fc,
- struct key *key,
- struct afs_vnode *vnode,
- bool async)
+int afs_fs_extend_lock(struct afs_fs_cursor *fc)
{
+ struct afs_vnode *vnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(vnode);
__be32 *bp;
if (!call)
return -ENOMEM;
- call->key = key;
+ call->key = fc->key;
call->reply[0] = vnode;
/* marshall the parameters */
*bp++ = htonl(vnode->fid.vnode);
*bp++ = htonl(vnode->fid.unique);
- afs_use_fs_server(call, fc->server);
- return afs_make_call(&fc->ac, call, GFP_NOFS, async);
+ afs_use_fs_server(call, fc->cbi);
+ return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}
/*
* release a lock on a file
*/
-int afs_fs_release_lock(struct afs_fs_cursor *fc,
- struct key *key,
- struct afs_vnode *vnode,
- bool async)
+int afs_fs_release_lock(struct afs_fs_cursor *fc)
{
+ struct afs_vnode *vnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(vnode);
__be32 *bp;
if (!call)
return -ENOMEM;
- call->key = key;
+ call->key = fc->key;
call->reply[0] = vnode;
/* marshall the parameters */
*bp++ = htonl(vnode->fid.vnode);
*bp++ = htonl(vnode->fid.unique);
- afs_use_fs_server(call, fc->server);
- return afs_make_call(&fc->ac, call, GFP_NOFS, async);
+ afs_use_fs_server(call, fc->cbi);
+ return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}
/*
/*
* Flush all the callbacks we have on a server.
*/
-int afs_fs_give_up_all_callbacks(struct afs_server *server,
+int afs_fs_give_up_all_callbacks(struct afs_net *net,
+ struct afs_server *server,
struct afs_addr_cursor *ac,
- struct key *key,
- bool async)
+ struct key *key)
{
struct afs_call *call;
__be32 *bp;
_enter("");
- call = afs_alloc_flat_call(server->net, &afs_RXFSGiveUpAllCallBacks, 2 * 4, 0);
+ call = afs_alloc_flat_call(net, &afs_RXFSGiveUpAllCallBacks, 1 * 4, 0);
if (!call)
return -ENOMEM;
*bp++ = htonl(FSGIVEUPALLCALLBACKS);
/* Can't take a ref on server */
- return afs_make_call(ac, call, GFP_NOFS, async);
+ return afs_make_call(ac, call, GFP_NOFS, false);
+}
+
+/*
+ * Deliver reply data to an FS.GetCapabilities operation.
+ */
+static int afs_deliver_fs_get_capabilities(struct afs_call *call)
+{
+ u32 count;
+ int ret;
+
+ _enter("{%u,%zu/%u}", call->unmarshall, call->offset, call->count);
+
+again:
+ switch (call->unmarshall) {
+ case 0:
+ call->offset = 0;
+ call->unmarshall++;
+
+ /* Extract the capabilities word count */
+ case 1:
+ ret = afs_extract_data(call, &call->tmp,
+ 1 * sizeof(__be32),
+ true);
+ if (ret < 0)
+ return ret;
+
+ count = ntohl(call->tmp);
+
+ call->count = count;
+ call->count2 = count;
+ call->offset = 0;
+ call->unmarshall++;
+
+ /* Extract capabilities words */
+ case 2:
+ count = min(call->count, 16U);
+ ret = afs_extract_data(call, call->buffer,
+ count * sizeof(__be32),
+ call->count > 16);
+ if (ret < 0)
+ return ret;
+
+ /* TODO: Examine capabilities */
+
+ call->count -= count;
+ if (call->count > 0)
+ goto again;
+ call->offset = 0;
+ call->unmarshall++;
+ break;
+ }
+
+ _leave(" = 0 [done]");
+ return 0;
+}
+
+/*
+ * FS.GetCapabilities operation type
+ */
+static const struct afs_call_type afs_RXFSGetCapabilities = {
+ .name = "FS.GetCapabilities",
+ .deliver = afs_deliver_fs_get_capabilities,
+ .destructor = afs_flat_call_destructor,
+};
+
+/*
+ * Probe a fileserver for the capabilities that it supports. This can
+ * return up to 196 words.
+ */
+int afs_fs_get_capabilities(struct afs_net *net,
+ struct afs_server *server,
+ struct afs_addr_cursor *ac,
+ struct key *key)
+{
+ struct afs_call *call;
+ __be32 *bp;
+
+ _enter("");
+
+ call = afs_alloc_flat_call(net, &afs_RXFSGetCapabilities, 1 * 4, 16 * 4);
+ if (!call)
+ return -ENOMEM;
+
+ call->key = key;
+
+ /* marshall the parameters */
+ bp = call->request;
+ *bp++ = htonl(FSGETCAPABILITIES);
+
+ /* Can't take a ref on server */
+ return afs_make_call(ac, call, GFP_NOFS, false);
}
return 0;
}
+/*
+ * Fetch file status from the volume.
+ */
+int afs_fetch_status(struct afs_vnode *vnode, struct key *key)
+{
+ struct afs_fs_cursor fc;
+ int ret;
+
+ _enter("%s,{%x:%u.%u,S=%lx}",
+ vnode->volume->name,
+ vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
+ vnode->flags);
+
+ ret = -ERESTARTSYS;
+ if (afs_begin_vnode_operation(&fc, vnode, key)) {
+ while (afs_select_fileserver(&fc)) {
+ fc.cb_break = vnode->cb_break + vnode->cb_s_break;
+ afs_fs_fetch_file_status(&fc, NULL);
+ }
+
+ afs_check_for_remote_deletion(&fc, fc.vnode);
+ afs_vnode_commit_status(&fc, vnode, fc.cb_break);
+ ret = afs_end_vnode_operation(&fc);
+ }
+
+ _leave(" = %d", ret);
+ return ret;
+}
+
/*
* iget5() comparator
*/
*/
struct inode *afs_iget(struct super_block *sb, struct key *key,
struct afs_fid *fid, struct afs_file_status *status,
- struct afs_callback *cb)
+ struct afs_callback *cb, struct afs_cb_interest *cbi)
{
struct afs_iget_data data = { .fid = *fid };
struct afs_super_info *as;
if (!status) {
/* it's a remotely extant inode */
- ret = afs_vnode_fetch_status(vnode, key, true);
+ ret = afs_fetch_status(vnode, key);
if (ret < 0)
goto bad_inode;
} else {
vnode->cb_version = cb->version;
vnode->cb_type = cb->type;
vnode->cb_expires_at = cb->expiry;
+ vnode->cb_interest = afs_get_cb_interest(cbi);
set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
}
* access */
if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
_debug("not promised");
- ret = afs_vnode_fetch_status(vnode, key, false);
+ ret = afs_fetch_status(vnode, key);
if (ret < 0) {
if (ret == -ENOENT) {
set_bit(AFS_VNODE_DELETED, &vnode->flags);
*/
int afs_setattr(struct dentry *dentry, struct iattr *attr)
{
+ struct afs_fs_cursor fc;
struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
struct key *key;
int ret;
}
}
- ret = afs_vnode_setattr(vnode, key, attr);
+ ret = -ERESTARTSYS;
+ if (afs_begin_vnode_operation(&fc, vnode, key)) {
+ while (afs_select_fileserver(&fc)) {
+ fc.cb_break = vnode->cb_break + vnode->cb_s_break;
+ afs_fs_setattr(&fc, attr);
+ }
+
+ afs_check_for_remote_deletion(&fc, fc.vnode);
+ afs_vnode_commit_status(&fc, vnode, fc.cb_break);
+ ret = afs_end_vnode_operation(&fc);
+ }
+
if (!(attr->ia_valid & ATTR_FILE))
key_put(key);
struct pagevec;
struct afs_call;
-typedef enum {
- AFS_VL_NEW, /* new, uninitialised record */
- AFS_VL_CREATING, /* creating record */
- AFS_VL_VALID, /* record is pending */
- AFS_VL_NO_VOLUME, /* no such volume available */
- AFS_VL_UPDATING, /* update in progress */
- AFS_VL_VOLUME_DELETED, /* volume was deleted */
- AFS_VL_UNCERTAIN, /* uncertain state (update failed) */
-} __attribute__((packed)) afs_vlocation_state_t;
-
struct afs_mount_params {
bool rwpath; /* T if the parent should be considered R/W */
bool force; /* T to force cell type */
struct afs_addr_list {
struct rcu_head rcu; /* Must be first */
refcount_t usage;
+ u32 version; /* Version */
unsigned short nr_addrs;
unsigned short index; /* Address currently in use */
+ unsigned short nr_ipv4; /* Number of IPv4 addresses */
struct sockaddr_rxrpc addrs[];
};
struct key *key; /* security for this call */
struct afs_net *net; /* The network namespace */
struct afs_server *cm_server; /* Server affected by incoming CM call */
- struct afs_server *server; /* Server used by client call */
+ struct afs_cb_interest *cbi; /* Callback interest for server used */
void *request; /* request data (first part) */
struct address_space *mapping; /* page set */
struct afs_writeback *wb; /* writeback being performed */
struct afs_net *net; /* Network namespace */
struct afs_cell *cell; /* The cell in which the volume resides */
struct afs_volume *volume; /* volume record */
- char rwparent; /* T if parent is R/W AFS volume */
};
static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
spinlock_t proc_cells_lock;
struct list_head proc_cells;
- /* Volume location database */
- struct list_head vl_updates; /* VL records in need-update order */
- struct list_head vl_graveyard; /* Inactive VL records */
- struct delayed_work vl_reaper;
- struct delayed_work vl_updater;
- spinlock_t vl_updates_lock;
- spinlock_t vl_graveyard_lock;
+ /* Known servers. Theoretically each fileserver can only be in one
+ * cell, but in practice, people create aliases and subsets and there's
+ * no easy way to distinguish them.
+ */
+ seqlock_t fs_lock; /* For fs_servers */
+ struct rb_root fs_servers; /* afs_server (by server UUID or address) */
+ struct list_head fs_updates; /* afs_server (by update_at) */
+ struct hlist_head fs_proc; /* procfs servers list */
- /* File locking renewal management */
- struct mutex lock_manager_mutex;
+ struct hlist_head fs_addresses4; /* afs_server (by lowest IPv4 addr) */
+ struct hlist_head fs_addresses6; /* afs_server (by lowest IPv6 addr) */
+ seqlock_t fs_addr_lock; /* For fs_addresses[46] */
- /* Server database */
- struct rb_root servers; /* Active servers */
- rwlock_t servers_lock;
- struct list_head server_graveyard; /* Inactive server LRU list */
- spinlock_t server_graveyard_lock;
- struct timer_list server_timer;
- struct work_struct server_reaper;
+ struct work_struct fs_manager;
+ struct timer_list fs_timer;
atomic_t servers_outstanding;
+ /* File locking renewal management */
+ struct mutex lock_manager_mutex;
+
/* Misc */
struct proc_dir_entry *proc_afs; /* /proc/net/afs directory */
};
};
/*
- * AFS cell record
+ * AFS cell record.
+ *
+ * This is a tricky concept to get right as it is possible to create aliases
+ * simply by pointing AFSDB/SRV records for two names at the same set of VL
+ * servers; it is also possible to do things like setting up two sets of VL
+ * servers, one of which provides a superset of the volumes provided by the
+ * other (for internal/external division, for example).
+ *
+ * Cells only exist in the sense that (a) a cell's name maps to a set of VL
+ * servers and (b) a cell's name is used by the client to select the key to use
+ * for authentication and encryption. The cell name is not typically used in
+ * the protocol.
+ *
+ * There is no easy way to determine if two cells are aliases or one is a
+ * subset of another.
*/
struct afs_cell {
union {
#ifdef CONFIG_AFS_FSCACHE
struct fscache_cookie *cache; /* caching cookie */
#endif
-
- /* server record management */
- rwlock_t servers_lock; /* active server list lock */
- struct list_head servers; /* active server list */
-
- /* volume location record management */
- struct rw_semaphore vl_sem; /* volume management serialisation semaphore */
- struct list_head vl_list; /* cell's active VL record list */
time64_t dns_expiry; /* Time AFSDB/SRV record expires */
time64_t last_inactive; /* Time of last drop of usage count */
atomic_t usage;
enum afs_cell_state state;
short error;
- spinlock_t vl_lock; /* vl_list lock */
+ /* Active fileserver interaction state. */
+ struct list_head proc_volumes; /* procfs volume list */
+ rwlock_t proc_lock;
- /* VLDB server list. */
+ /* VL server list. */
rwlock_t vl_addrs_lock; /* Lock on vl_addrs */
struct afs_addr_list __rcu *vl_addrs; /* List of VL servers */
u8 name_len; /* Length of name */
};
/*
- * entry in the cached volume location catalogue
+ * Cached VLDB entry.
+ *
+ * This is pointed to by cell->vldb_entries, indexed by name.
*/
-struct afs_cache_vlocation {
- /* volume name (lowercase, padded with NULs) */
- uint8_t name[AFS_MAXVOLNAME + 1];
+struct afs_vldb_entry {
+ afs_volid_t vid[3]; /* Volume IDs for R/W, R/O and Bak volumes */
- uint8_t nservers; /* number of entries used in servers[] */
- uint8_t vidmask; /* voltype mask for vid[] */
- uint8_t srvtmask[8]; /* voltype masks for servers[] */
+ unsigned long flags;
+#define AFS_VLDB_HAS_RW 0 /* - R/W volume exists */
+#define AFS_VLDB_HAS_RO 1 /* - R/O volume exists */
+#define AFS_VLDB_HAS_BAK 2 /* - Backup volume exists */
+#define AFS_VLDB_QUERY_VALID 3 /* - Record is valid */
+#define AFS_VLDB_QUERY_ERROR 4 /* - VL server returned error */
+
+ uuid_t fs_server[AFS_NMAXNSERVERS];
+ u8 fs_mask[AFS_NMAXNSERVERS];
#define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */
#define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */
#define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
-
- afs_volid_t vid[3]; /* volume IDs for R/W, R/O and Bak volumes */
- struct sockaddr_rxrpc servers[8]; /* fileserver addresses */
- time_t rtime; /* last retrieval time */
-};
-
-/*
- * AFS volume location record
- */
-struct afs_vlocation {
- atomic_t usage;
- time64_t time_of_death; /* time at which put reduced usage to 0 */
- struct list_head link; /* link in cell volume location list */
- struct list_head grave; /* link in master graveyard list */
- struct list_head update; /* link in master update list */
- struct afs_cell *cell; /* cell to which volume belongs */
- struct afs_cache_vlocation vldb; /* volume information DB record */
- struct afs_volume *vols[3]; /* volume access record pointer (index by type) */
- wait_queue_head_t waitq; /* status change waitqueue */
- time64_t update_at; /* time at which record should be updated */
- spinlock_t lock; /* access lock */
- afs_vlocation_state_t state; /* volume location state */
- unsigned short upd_rej_cnt; /* ENOMEDIUM count during update */
- unsigned short upd_busy_cnt; /* EBUSY count during update */
- bool valid; /* T if valid */
+ short error;
+ u8 nr_servers; /* Number of server records */
+ u8 name_len;
+ u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
};
/*
- * AFS fileserver record
+ * Record of fileserver with which we're actively communicating.
*/
struct afs_server {
- atomic_t usage;
- time64_t time_of_death; /* time at which put reduced usage to 0 */
- struct afs_addr_list __rcu *addrs; /* List of addresses for this server */
- struct afs_net *net; /* Network namespace in which the server resides */
- struct afs_cell *cell; /* cell in which server resides */
- struct list_head link; /* link in cell's server list */
- struct list_head grave; /* link in master graveyard list */
-
- struct rb_node master_rb; /* link in master by-addr tree */
- struct rw_semaphore sem; /* access lock */
+ struct rcu_head rcu;
+ union {
+ uuid_t uuid; /* Server ID */
+ struct afs_uuid _uuid;
+ };
+
+ struct afs_addr_list __rcu *addresses;
+ struct rb_node uuid_rb; /* Link in net->servers */
+ struct hlist_node addr4_link; /* Link in net->fs_addresses4 */
+ struct hlist_node addr6_link; /* Link in net->fs_addresses6 */
+ struct hlist_node proc_link; /* Link in net->fs_proc */
+ struct afs_server *gc_next; /* Next server in manager's list */
+ time64_t put_time; /* Time at which last put */
+ time64_t update_at; /* Time at which to next update the record */
unsigned long flags;
-#define AFS_SERVER_NEW 0 /* New server, don't inc cb_s_break */
+#define AFS_SERVER_FL_NEW 0 /* New server, don't inc cb_s_break */
+#define AFS_SERVER_FL_NOT_READY 1 /* The record is not ready for use */
+#define AFS_SERVER_FL_NOT_FOUND 2 /* VL server says no such server */
+#define AFS_SERVER_FL_VL_FAIL 3 /* Failed to access VL server */
+#define AFS_SERVER_FL_UPDATING 4
+#define AFS_SERVER_FL_PROBED 5 /* The fileserver has been probed */
+#define AFS_SERVER_FL_PROBING 6 /* Fileserver is being probed */
+ atomic_t usage;
+ u32 addr_version; /* Address list version */
/* file service access */
- int fs_state; /* 0 or reason FS currently marked dead (-errno) */
- spinlock_t fs_lock; /* access lock */
+ rwlock_t fs_lock; /* access lock */
/* callback promise management */
struct list_head cb_interests; /* List of superblocks using this server */
};
/*
- * AFS volume access record
+ * Replaceable server list.
+ */
+struct afs_server_entry {
+ struct afs_server *server;
+ struct afs_cb_interest *cb_interest;
+};
+
+struct afs_server_list {
+ refcount_t usage;
+ unsigned short nr_servers;
+ unsigned short index; /* Server currently in use */
+ unsigned short vnovol_mask; /* Servers to be skipped due to VNOVOL */
+ unsigned int seq; /* Set to ->servers_seq when installed */
+ struct afs_server_entry servers[];
+};
+
+/*
+ * Live AFS volume management.
*/
struct afs_volume {
+ afs_volid_t vid; /* volume ID */
atomic_t usage;
- struct afs_cell *cell; /* cell to which belongs (unrefd ptr) */
- struct afs_vlocation *vlocation; /* volume location */
+ time64_t update_at; /* Time at which to next update */
+ struct afs_cell *cell; /* Cell to which belongs (pins ref) */
+ struct list_head proc_link; /* Link in cell->vl_proc */
+ unsigned long flags;
+#define AFS_VOLUME_NEEDS_UPDATE 0 /* - T if an update needs performing */
+#define AFS_VOLUME_UPDATING 1 /* - T if an update is in progress */
+#define AFS_VOLUME_WAIT 2 /* - T if users must wait for update */
+#define AFS_VOLUME_DELETED 3 /* - T if volume appears deleted */
+#define AFS_VOLUME_OFFLINE 4 /* - T if volume offline notice given */
+#define AFS_VOLUME_BUSY 5 /* - T if volume busy notice given */
#ifdef CONFIG_AFS_FSCACHE
struct fscache_cookie *cache; /* caching cookie */
#endif
- afs_volid_t vid; /* volume ID */
+ struct afs_server_list *servers; /* List of servers on which volume resides */
+ rwlock_t servers_lock; /* Lock for ->servers */
+ unsigned int servers_seq; /* Incremented each time ->servers changes */
+
afs_voltype_t type; /* type of volume */
+ short error;
char type_force; /* force volume type (suppress R/O -> R/W) */
- unsigned short nservers; /* number of server slots filled */
- unsigned short rjservers; /* number of servers discarded due to -ENOMEDIUM */
- struct afs_server *servers[8]; /* servers on which volume resides (ordered) */
- struct afs_cb_interest *cb_interests[8]; /* Interests on servers for callbacks */
- struct rw_semaphore server_sem; /* lock for accessing current server */
-};
-
-/*
- * vnode catalogue entry
- */
-struct afs_cache_vnode {
- afs_vnodeid_t vnode_id; /* vnode ID */
- unsigned vnode_unique; /* vnode ID uniquifier */
- afs_dataversion_t data_version; /* data version */
+ u8 name_len;
+ u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
};
/*
struct fscache_cookie *cache; /* caching cookie */
#endif
struct afs_permits *permit_cache; /* cache of permits so far obtained */
+ struct mutex io_lock; /* Lock for serialising I/O on this mutex */
struct mutex validate_lock; /* lock for validating this vnode */
- wait_queue_head_t update_waitq; /* status fetch waitqueue */
- int update_cnt; /* number of outstanding ops that will update the
- * status */
spinlock_t writeback_lock; /* lock for writebacks */
spinlock_t lock; /* waitqueue/flags lock */
unsigned long flags;
struct afs_addr_cursor {
struct afs_addr_list *alist; /* Current address list (pins ref) */
struct sockaddr_rxrpc *addr;
+ u32 abort_code;
unsigned short start; /* Starting point in alist->addrs[] */
unsigned short index; /* Wrapping offset from start to current addr */
short error;
*/
struct afs_fs_cursor {
struct afs_addr_cursor ac;
- struct afs_server *server; /* Current server (pins ref) */
+ struct afs_vnode *vnode;
+ struct afs_server_list *server_list; /* Current server list (pins ref) */
+ struct afs_cb_interest *cbi; /* Server on which this resides (pins ref) */
+ struct key *key; /* Key for the server */
+ unsigned int cb_break; /* cb_break + cb_s_break before the call */
+ unsigned int cb_break_2; /* cb_break + cb_s_break (2nd vnode) */
+ unsigned char start; /* Initial index in server list */
+ unsigned char index; /* Number of servers tried beyond start */
+ unsigned short flags;
+#define AFS_FS_CURSOR_STOP 0x0001 /* Set to cease iteration */
+#define AFS_FS_CURSOR_VBUSY 0x0002 /* Set if seen VBUSY */
+#define AFS_FS_CURSOR_VMOVED 0x0004 /* Set if seen VMOVED */
+#define AFS_FS_CURSOR_VNOVOL 0x0008 /* Set if seen VNOVOL */
+#define AFS_FS_CURSOR_CUR_ONLY 0x0010 /* Set if current server only (file lock held) */
+#define AFS_FS_CURSOR_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */
};
/*****************************************************************************/
extern int afs_end_cursor(struct afs_addr_cursor *);
extern int afs_set_vl_cursor(struct afs_addr_cursor *, struct afs_cell *);
+extern void afs_merge_fs_addr4(struct afs_addr_list *, __be32);
+
/*
* cache.c
*/
extern void afs_break_callback(struct afs_vnode *);
extern void afs_break_callbacks(struct afs_server *, size_t,struct afs_callback[]);
-extern int afs_register_server_cb_interest(struct afs_vnode *, struct afs_cb_interest **,
- struct afs_server *);
+extern int afs_register_server_cb_interest(struct afs_vnode *, struct afs_server_entry *);
extern void afs_put_cb_interest(struct afs_net *, struct afs_cb_interest *);
-extern void afs_clear_callback_interests(struct afs_net *, struct afs_volume *);
+extern void afs_clear_callback_interests(struct afs_net *, struct afs_server_list *);
static inline struct afs_cb_interest *afs_get_cb_interest(struct afs_cb_interest *cbi)
{
extern int afs_open(struct inode *, struct file *);
extern int afs_release(struct inode *, struct file *);
+extern int afs_fetch_data(struct afs_vnode *, struct key *, struct afs_read *);
extern int afs_page_filler(void *, struct page *);
extern void afs_put_read(struct afs_read *);
/*
* fsclient.c
*/
-extern int afs_fs_fetch_file_status(struct afs_fs_cursor *, struct key *,
- struct afs_vnode *, struct afs_volsync *,
- bool);
-extern int afs_fs_give_up_callbacks(struct afs_net *, struct afs_server *, bool);
-extern int afs_fs_fetch_data(struct afs_fs_cursor *, struct key *,
- struct afs_vnode *, struct afs_read *, bool);
-extern int afs_fs_create(struct afs_fs_cursor *, struct key *,
- struct afs_vnode *, const char *, umode_t,
- struct afs_fid *, struct afs_file_status *,
- struct afs_callback *, bool);
-extern int afs_fs_remove(struct afs_fs_cursor *, struct key *,
- struct afs_vnode *, const char *, bool, bool);
-extern int afs_fs_link(struct afs_fs_cursor *, struct key *, struct afs_vnode *,
- struct afs_vnode *, const char *, bool);
-extern int afs_fs_symlink(struct afs_fs_cursor *, struct key *,
- struct afs_vnode *, const char *, const char *,
- struct afs_fid *, struct afs_file_status *, bool);
-extern int afs_fs_rename(struct afs_fs_cursor *, struct key *,
- struct afs_vnode *, const char *,
- struct afs_vnode *, const char *, bool);
+extern int afs_fs_fetch_file_status(struct afs_fs_cursor *, struct afs_volsync *);
+extern int afs_fs_give_up_callbacks(struct afs_net *, struct afs_server *);
+extern int afs_fs_fetch_data(struct afs_fs_cursor *, struct afs_read *);
+extern int afs_fs_create(struct afs_fs_cursor *, const char *, umode_t,
+ struct afs_fid *, struct afs_file_status *, struct afs_callback *);
+extern int afs_fs_remove(struct afs_fs_cursor *, const char *, bool);
+extern int afs_fs_link(struct afs_fs_cursor *, struct afs_vnode *, const char *);
+extern int afs_fs_symlink(struct afs_fs_cursor *, const char *, const char *,
+ struct afs_fid *, struct afs_file_status *);
+extern int afs_fs_rename(struct afs_fs_cursor *, const char *,
+ struct afs_vnode *, const char *);
extern int afs_fs_store_data(struct afs_fs_cursor *, struct afs_writeback *,
- pgoff_t, pgoff_t, unsigned, unsigned, bool);
-extern int afs_fs_setattr(struct afs_fs_cursor *, struct key *,
- struct afs_vnode *, struct iattr *, bool);
-extern int afs_fs_get_volume_status(struct afs_fs_cursor *, struct key *,
- struct afs_vnode *,
- struct afs_volume_status *, bool);
-extern int afs_fs_set_lock(struct afs_fs_cursor *, struct key *,
- struct afs_vnode *, afs_lock_type_t, bool);
-extern int afs_fs_extend_lock(struct afs_fs_cursor *, struct key *,
- struct afs_vnode *, bool);
-extern int afs_fs_release_lock(struct afs_fs_cursor *, struct key *,
- struct afs_vnode *, bool);
-extern int afs_fs_give_up_all_callbacks(struct afs_server *, struct afs_addr_cursor *,
- struct key *, bool);
+ pgoff_t, pgoff_t, unsigned, unsigned);
+extern int afs_fs_setattr(struct afs_fs_cursor *, struct iattr *);
+extern int afs_fs_get_volume_status(struct afs_fs_cursor *, struct afs_volume_status *);
+extern int afs_fs_set_lock(struct afs_fs_cursor *, afs_lock_type_t);
+extern int afs_fs_extend_lock(struct afs_fs_cursor *);
+extern int afs_fs_release_lock(struct afs_fs_cursor *);
+extern int afs_fs_give_up_all_callbacks(struct afs_net *, struct afs_server *,
+ struct afs_addr_cursor *, struct key *);
+extern int afs_fs_get_capabilities(struct afs_net *, struct afs_server *,
+ struct afs_addr_cursor *, struct key *);
/*
* inode.c
*/
+extern int afs_fetch_status(struct afs_vnode *, struct key *);
extern int afs_iget5_test(struct inode *, void *);
extern struct inode *afs_iget_autocell(struct inode *, const char *, int,
struct key *);
extern struct inode *afs_iget(struct super_block *, struct key *,
struct afs_fid *, struct afs_file_status *,
- struct afs_callback *);
+ struct afs_callback *,
+ struct afs_cb_interest *);
extern void afs_zap_data(struct afs_vnode *);
extern int afs_validate(struct afs_vnode *, struct key *);
extern int afs_getattr(const struct path *, struct kstat *, u32, unsigned int);
extern int afs_proc_cell_setup(struct afs_net *, struct afs_cell *);
extern void afs_proc_cell_remove(struct afs_net *, struct afs_cell *);
+/*
+ * rotate.c
+ */
+extern bool afs_begin_vnode_operation(struct afs_fs_cursor *, struct afs_vnode *,
+ struct key *);
+extern bool afs_select_fileserver(struct afs_fs_cursor *);
+extern bool afs_select_current_fileserver(struct afs_fs_cursor *);
+extern int afs_end_vnode_operation(struct afs_fs_cursor *);
+
/*
* rxrpc.c
*/
return server;
}
-extern void afs_server_timer(struct timer_list *);
-extern struct afs_server *afs_lookup_server(struct afs_cell *,
- struct sockaddr_rxrpc *);
extern struct afs_server *afs_find_server(struct afs_net *,
const struct sockaddr_rxrpc *);
+extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *);
+extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *);
extern void afs_put_server(struct afs_net *, struct afs_server *);
-extern void afs_reap_server(struct work_struct *);
+extern void afs_manage_servers(struct work_struct *);
+extern void afs_servers_timer(struct timer_list *);
extern void __net_exit afs_purge_servers(struct afs_net *);
+extern bool afs_probe_fileserver(struct afs_fs_cursor *);
+extern bool afs_check_server_record(struct afs_fs_cursor *, struct afs_server *);
/*
- * super.c
+ * server_list.c
*/
-extern int __init afs_fs_init(void);
-extern void __exit afs_fs_exit(void);
+static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist)
+{
+ refcount_inc(&slist->usage);
+ return slist;
+}
-/*
- * vlclient.c
- */
-extern int afs_vl_get_entry_by_name(struct afs_net *, struct afs_addr_cursor *,
- struct key *, const char *,
- struct afs_cache_vlocation *, bool);
-extern int afs_vl_get_entry_by_id(struct afs_net *, struct afs_addr_cursor *,
- struct key *, afs_volid_t, afs_voltype_t,
- struct afs_cache_vlocation *, bool);
+extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *);
+extern struct afs_server_list *afs_alloc_server_list(struct afs_cell *, struct key *,
+ struct afs_vldb_entry *,
+ u8);
+extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *);
/*
- * vlocation.c
+ * super.c
*/
-extern struct workqueue_struct *afs_vlocation_update_worker;
-
-#define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0)
-
-extern struct afs_vlocation *afs_vlocation_lookup(struct afs_net *,
- struct afs_cell *,
- struct key *,
- const char *, size_t);
-extern void afs_put_vlocation(struct afs_net *, struct afs_vlocation *);
-extern void afs_vlocation_updater(struct work_struct *);
-extern void afs_vlocation_reaper(struct work_struct *);
-extern void __net_exit afs_vlocation_purge(struct afs_net *);
+extern int __init afs_fs_init(void);
+extern void __exit afs_fs_exit(void);
/*
- * vnode.c
+ * vlclient.c
*/
-static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
-{
- return container_of(inode, struct afs_vnode, vfs_inode);
-}
-
-static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
-{
- return &vnode->vfs_inode;
-}
-
-extern void afs_vnode_finalise_status_update(struct afs_vnode *,
- struct afs_server *);
-extern int afs_vnode_fetch_status(struct afs_vnode *, struct key *, bool);
-extern int afs_vnode_fetch_data(struct afs_vnode *, struct key *,
- struct afs_read *);
-extern int afs_vnode_create(struct afs_vnode *, struct key *, const char *,
- umode_t, struct afs_fid *, struct afs_file_status *,
- struct afs_callback *, struct afs_server **);
-extern int afs_vnode_remove(struct afs_vnode *, struct key *, const char *,
- bool);
-extern int afs_vnode_link(struct afs_vnode *, struct afs_vnode *, struct key *,
- const char *);
-extern int afs_vnode_symlink(struct afs_vnode *, struct key *, const char *,
- const char *, struct afs_fid *,
- struct afs_file_status *, struct afs_server **);
-extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *,
- struct key *, const char *, const char *);
-extern int afs_vnode_store_data(struct afs_writeback *, pgoff_t, pgoff_t,
- unsigned, unsigned);
-extern int afs_vnode_setattr(struct afs_vnode *, struct key *, struct iattr *);
-extern int afs_vnode_get_volume_status(struct afs_vnode *, struct key *,
- struct afs_volume_status *);
-extern int afs_vnode_set_lock(struct afs_vnode *, struct key *,
- afs_lock_type_t);
-extern int afs_vnode_extend_lock(struct afs_vnode *, struct key *);
-extern int afs_vnode_release_lock(struct afs_vnode *, struct key *);
+extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_net *,
+ struct afs_addr_cursor *,
+ struct key *, const char *, int);
+extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_net *, struct afs_addr_cursor *,
+ struct key *, const uuid_t *);
/*
* volume.c
*/
-static inline struct afs_volume *afs_get_volume(struct afs_volume *volume)
+static inline struct afs_volume *__afs_get_volume(struct afs_volume *volume)
{
if (volume)
atomic_inc(&volume->usage);
return volume;
}
+extern struct afs_volume *afs_create_volume(struct afs_mount_params *);
+extern void afs_activate_volume(struct afs_volume *);
+extern void afs_deactivate_volume(struct afs_volume *);
extern void afs_put_volume(struct afs_cell *, struct afs_volume *);
-extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *);
-extern void afs_init_fs_cursor(struct afs_fs_cursor *, struct afs_vnode *);
-extern int afs_set_fs_cursor(struct afs_fs_cursor *, struct afs_vnode *);
-extern bool afs_volume_pick_fileserver(struct afs_fs_cursor *, struct afs_vnode *);
-extern bool afs_iterate_fs_cursor(struct afs_fs_cursor *, struct afs_vnode *);
-extern int afs_end_fs_cursor(struct afs_fs_cursor *, struct afs_net *);
+extern int afs_check_volume_status(struct afs_volume *, struct key *);
/*
* write.c
extern const struct xattr_handler *afs_xattr_handlers[];
extern ssize_t afs_listxattr(struct dentry *, char *, size_t);
+
+/*
+ * Miscellaneous inline functions.
+ */
+static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
+{
+ return container_of(inode, struct afs_vnode, vfs_inode);
+}
+
+static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
+{
+ return &vnode->vfs_inode;
+}
+
+static inline void afs_vnode_commit_status(struct afs_fs_cursor *fc,
+ struct afs_vnode *vnode,
+ unsigned int cb_break)
+{
+ if (fc->ac.error == 0)
+ afs_cache_permit(vnode, fc->key, cb_break);
+}
+
+static inline void afs_check_for_remote_deletion(struct afs_fs_cursor *fc,
+ struct afs_vnode *vnode)
+{
+ if (fc->ac.error == -ENOENT) {
+ set_bit(AFS_VNODE_DELETED, &vnode->flags);
+ afs_break_callback(vnode);
+ }
+}
+
+
/*****************************************************************************/
/*
* debug tracing
spin_lock_init(&net->proc_cells_lock);
INIT_LIST_HEAD(&net->proc_cells);
- INIT_LIST_HEAD(&net->vl_updates);
- INIT_LIST_HEAD(&net->vl_graveyard);
- INIT_DELAYED_WORK(&net->vl_reaper, afs_vlocation_reaper);
- INIT_DELAYED_WORK(&net->vl_updater, afs_vlocation_updater);
- spin_lock_init(&net->vl_updates_lock);
- spin_lock_init(&net->vl_graveyard_lock);
- net->servers = RB_ROOT;
- rwlock_init(&net->servers_lock);
- INIT_LIST_HEAD(&net->server_graveyard);
- spin_lock_init(&net->server_graveyard_lock);
- INIT_WORK(&net->server_reaper, afs_reap_server);
- timer_setup(&net->server_timer, afs_server_timer, 0);
+ seqlock_init(&net->fs_lock);
+ net->fs_servers = RB_ROOT;
+ INIT_LIST_HEAD(&net->fs_updates);
+ INIT_HLIST_HEAD(&net->fs_proc);
+
+ INIT_HLIST_HEAD(&net->fs_addresses4);
+ INIT_HLIST_HEAD(&net->fs_addresses6);
+ seqlock_init(&net->fs_addr_lock);
+
+ INIT_WORK(&net->fs_manager, afs_manage_servers);
+ timer_setup(&net->fs_timer, afs_servers_timer, 0);
/* Register the /proc stuff */
ret = afs_proc_init(net);
error_open_socket:
net->live = false;
- afs_vlocation_purge(net);
afs_cell_purge(net);
+ afs_purge_servers(net);
error_cell_init:
net->live = false;
afs_proc_cleanup(net);
static void __net_exit afs_net_exit(struct afs_net *net)
{
net->live = false;
- afs_purge_servers(net);
- afs_vlocation_purge(net);
afs_cell_purge(net);
+ afs_purge_servers(net);
afs_close_socket(net);
afs_proc_cleanup(net);
}
afs_async_calls = alloc_workqueue("kafsd", WQ_MEM_RECLAIM, 0);
if (!afs_async_calls)
goto error_async;
- afs_vlocation_update_worker =
- alloc_workqueue("kafs_vlupdated", WQ_MEM_RECLAIM, 0);
- if (!afs_vlocation_update_worker)
- goto error_vl_up;
afs_lock_manager = alloc_workqueue("kafs_lockd", WQ_MEM_RECLAIM, 0);
if (!afs_lock_manager)
goto error_lockmgr;
#endif
destroy_workqueue(afs_lock_manager);
error_lockmgr:
- destroy_workqueue(afs_vlocation_update_worker);
-error_vl_up:
destroy_workqueue(afs_async_calls);
error_async:
destroy_workqueue(afs_wq);
fscache_unregister_netfs(&afs_cache_netfs);
#endif
destroy_workqueue(afs_lock_manager);
- destroy_workqueue(afs_vlocation_update_worker);
destroy_workqueue(afs_async_calls);
destroy_workqueue(afs_wq);
afs_clean_up_permit_cache();
.release = seq_release,
};
-static int afs_proc_cell_servers_open(struct inode *inode, struct file *file);
-static void *afs_proc_cell_servers_start(struct seq_file *p, loff_t *pos);
-static void *afs_proc_cell_servers_next(struct seq_file *p, void *v,
+static int afs_proc_servers_open(struct inode *inode, struct file *file);
+static void *afs_proc_servers_start(struct seq_file *p, loff_t *pos);
+static void *afs_proc_servers_next(struct seq_file *p, void *v,
loff_t *pos);
-static void afs_proc_cell_servers_stop(struct seq_file *p, void *v);
-static int afs_proc_cell_servers_show(struct seq_file *m, void *v);
-
-static const struct seq_operations afs_proc_cell_servers_ops = {
- .start = afs_proc_cell_servers_start,
- .next = afs_proc_cell_servers_next,
- .stop = afs_proc_cell_servers_stop,
- .show = afs_proc_cell_servers_show,
+static void afs_proc_servers_stop(struct seq_file *p, void *v);
+static int afs_proc_servers_show(struct seq_file *m, void *v);
+
+static const struct seq_operations afs_proc_servers_ops = {
+ .start = afs_proc_servers_start,
+ .next = afs_proc_servers_next,
+ .stop = afs_proc_servers_stop,
+ .show = afs_proc_servers_show,
};
-static const struct file_operations afs_proc_cell_servers_fops = {
- .open = afs_proc_cell_servers_open,
+static const struct file_operations afs_proc_servers_fops = {
+ .open = afs_proc_servers_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
goto error_dir;
if (!proc_create("cells", 0644, net->proc_afs, &afs_proc_cells_fops) ||
- !proc_create("rootcell", 0644, net->proc_afs, &afs_proc_rootcell_fops))
+ !proc_create("rootcell", 0644, net->proc_afs, &afs_proc_rootcell_fops) ||
+ !proc_create("servers", 0644, net->proc_afs, &afs_proc_servers_fops))
goto error_tree;
_leave(" = 0");
m = file->private_data;
m->private = PDE_DATA(inode);
-
return 0;
}
if (!dir)
goto error_dir;
- if (!proc_create_data("servers", 0, dir,
- &afs_proc_cell_servers_fops, cell) ||
- !proc_create_data("vlservers", 0, dir,
- &afs_proc_cell_vlservers_fops, cell) ||
+ if (!proc_create_data("vlservers", 0, dir,
+ &afs_proc_cell_vlservers_fops, cell) ||
!proc_create_data("volumes", 0, dir,
- &afs_proc_cell_volumes_fops, cell))
+ &afs_proc_cell_volumes_fops, cell))
goto error_tree;
_leave(" = 0");
_enter("cell=%p pos=%Ld", cell, *_pos);
- /* lock the list against modification */
- down_read(&cell->vl_sem);
- return seq_list_start_head(&cell->vl_list, *_pos);
+ read_lock(&cell->proc_lock);
+ return seq_list_start_head(&cell->proc_volumes, *_pos);
}
/*
struct afs_cell *cell = p->private;
_enter("cell=%p pos=%Ld", cell, *_pos);
- return seq_list_next(v, &cell->vl_list, _pos);
+ return seq_list_next(v, &cell->proc_volumes, _pos);
}
/*
{
struct afs_cell *cell = p->private;
- up_read(&cell->vl_sem);
+ read_unlock(&cell->proc_lock);
}
-static const char afs_vlocation_states[][4] = {
- [AFS_VL_NEW] = "New",
- [AFS_VL_CREATING] = "Crt",
- [AFS_VL_VALID] = "Val",
- [AFS_VL_NO_VOLUME] = "NoV",
- [AFS_VL_UPDATING] = "Upd",
- [AFS_VL_VOLUME_DELETED] = "Del",
- [AFS_VL_UNCERTAIN] = "Unc",
+static const char afs_vol_types[3][3] = {
+ [AFSVL_RWVOL] = "RW",
+ [AFSVL_ROVOL] = "RO",
+ [AFSVL_BACKVOL] = "BK",
};
/*
static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
{
struct afs_cell *cell = m->private;
- struct afs_vlocation *vlocation =
- list_entry(v, struct afs_vlocation, link);
+ struct afs_volume *vol = list_entry(v, struct afs_volume, proc_link);
- /* display header on line 1 */
- if (v == &cell->vl_list) {
- seq_puts(m, "USE STT VLID[0] VLID[1] VLID[2] NAME\n");
+ /* Display header on line 1 */
+ if (v == &cell->proc_volumes) {
+ seq_puts(m, "USE VID TY\n");
return 0;
}
- /* display one cell per line on subsequent lines */
- seq_printf(m, "%3d %s %08x %08x %08x %s\n",
- atomic_read(&vlocation->usage),
- afs_vlocation_states[vlocation->state],
- vlocation->vldb.vid[0],
- vlocation->vldb.vid[1],
- vlocation->vldb.vid[2],
- vlocation->vldb.name);
+ seq_printf(m, "%3d %08x %s\n",
+ atomic_read(&vol->usage), vol->vid,
+ afs_vol_types[vol->type]);
return 0;
}
}
/*
- * open "/proc/fs/afs/<cell>/servers" which provides a summary of active
+ * open "/proc/fs/afs/servers" which provides a summary of active
* servers
*/
-static int afs_proc_cell_servers_open(struct inode *inode, struct file *file)
+static int afs_proc_servers_open(struct inode *inode, struct file *file)
{
- struct afs_cell *cell;
- struct seq_file *m;
- int ret;
-
- cell = PDE_DATA(inode);
- if (!cell)
- return -ENOENT;
-
- ret = seq_open(file, &afs_proc_cell_servers_ops);
- if (ret < 0)
- return ret;
-
- m = file->private_data;
- m->private = cell;
- return 0;
+ return seq_open(file, &afs_proc_servers_ops);
}
/*
- * set up the iterator to start reading from the cells list and return the
- * first item
+ * Set up the iterator to start reading from the server list and return the
+ * first item.
*/
-static void *afs_proc_cell_servers_start(struct seq_file *m, loff_t *_pos)
- __acquires(m->private->servers_lock)
+static void *afs_proc_servers_start(struct seq_file *m, loff_t *_pos)
{
- struct afs_cell *cell = m->private;
-
- _enter("cell=%p pos=%Ld", cell, *_pos);
+ struct afs_net *net = afs_seq2net(m);
- /* lock the list against modification */
- read_lock(&cell->servers_lock);
- return seq_list_start_head(&cell->servers, *_pos);
+ rcu_read_lock();
+ return seq_hlist_start_head_rcu(&net->fs_proc, *_pos);
}
/*
* move to next cell in cells list
*/
-static void *afs_proc_cell_servers_next(struct seq_file *p, void *v,
- loff_t *_pos)
+static void *afs_proc_servers_next(struct seq_file *m, void *v, loff_t *_pos)
{
- struct afs_cell *cell = p->private;
+ struct afs_net *net = afs_seq2net(m);
- _enter("cell=%p pos=%Ld", cell, *_pos);
- return seq_list_next(v, &cell->servers, _pos);
+ return seq_hlist_next_rcu(v, &net->fs_proc, _pos);
}
/*
* clean up after reading from the cells list
*/
-static void afs_proc_cell_servers_stop(struct seq_file *p, void *v)
- __releases(p->private->servers_lock)
+static void afs_proc_servers_stop(struct seq_file *p, void *v)
{
- struct afs_cell *cell = p->private;
-
- read_unlock(&cell->servers_lock);
+ rcu_read_unlock();
}
/*
* display a header line followed by a load of volume lines
*/
-static int afs_proc_cell_servers_show(struct seq_file *m, void *v)
+static int afs_proc_servers_show(struct seq_file *m, void *v)
{
- struct afs_cell *cell = m->private;
- struct afs_server *server = list_entry(v, struct afs_server, link);
- char ipaddr[64];
+ struct afs_server *server;
+ struct afs_addr_list *alist;
- /* display header on line 1 */
- if (v == &cell->servers) {
- seq_puts(m, "USE ADDR STATE\n");
+ if (v == SEQ_START_TOKEN) {
+ seq_puts(m, "UUID USE ADDR\n");
return 0;
}
- /* display one cell per line on subsequent lines */
- sprintf(ipaddr, "%pISp", &server->addrs->addrs[0].transport);
- seq_printf(m, "%3d %-15s %5d\n",
- atomic_read(&server->usage), ipaddr, server->fs_state);
-
+ server = list_entry(v, struct afs_server, proc_link);
+ alist = rcu_dereference(server->addresses);
+ seq_printf(m, "%pU %3d %pISp\n",
+ &server->uuid,
+ atomic_read(&server->usage),
+ &alist->addrs[alist->index].transport);
return 0;
}
#include <linux/kernel.h>
#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/sched/signal.h>
#include "internal.h"
+#include "afs_fs.h"
/*
* Initialise a filesystem server cursor for iterating over FS servers.
memset(fc, 0, sizeof(*fc));
}
+/*
+ * Begin an operation on the fileserver.
+ *
+ * Fileserver operations are serialised on the server by vnode, so we serialise
+ * them here also using the io_lock.
+ */
+bool afs_begin_vnode_operation(struct afs_fs_cursor *fc, struct afs_vnode *vnode,
+ struct key *key)
+{
+ afs_init_fs_cursor(fc, vnode);
+ fc->vnode = vnode;
+ fc->key = key;
+ fc->ac.error = SHRT_MAX;
+
+ if (mutex_lock_interruptible(&vnode->io_lock) < 0) {
+ fc->ac.error = -EINTR;
+ fc->flags |= AFS_FS_CURSOR_STOP;
+ return false;
+ }
+
+ if (test_bit(AFS_VNODE_READLOCKED, &vnode->flags) ||
+ test_bit(AFS_VNODE_WRITELOCKED, &vnode->flags))
+ fc->flags |= AFS_FS_CURSOR_CUR_ONLY;
+ return true;
+}
+
+/*
+ * Begin iteration through a server list, starting with the vnode's last used
+ * server if possible, or the last recorded good server if not.
+ */
+static bool afs_start_fs_iteration(struct afs_fs_cursor *fc,
+ struct afs_vnode *vnode)
+{
+ struct afs_cb_interest *cbi;
+ int i;
+
+ read_lock(&vnode->volume->servers_lock);
+ fc->server_list = afs_get_serverlist(vnode->volume->servers);
+ read_unlock(&vnode->volume->servers_lock);
+
+ cbi = vnode->cb_interest;
+ if (cbi) {
+ /* See if the vnode's preferred record is still available */
+ for (i = 0; i < fc->server_list->nr_servers; i++) {
+ if (fc->server_list->servers[i].cb_interest == cbi) {
+ fc->start = i;
+ goto found_interest;
+ }
+ }
+
+ /* If we have a lock outstanding on a server that's no longer
+ * serving this vnode, then we can't switch to another server
+ * and have to return an error.
+ */
+ if (fc->flags & AFS_FS_CURSOR_CUR_ONLY) {
+ fc->ac.error = -ESTALE;
+ return false;
+ }
+
+ /* Note that the callback promise is effectively broken */
+ write_seqlock(&vnode->cb_lock);
+ ASSERTCMP(cbi, ==, vnode->cb_interest);
+ vnode->cb_interest = NULL;
+ if (test_and_clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags))
+ vnode->cb_break++;
+ write_sequnlock(&vnode->cb_lock);
+
+ afs_put_cb_interest(afs_v2net(vnode), cbi);
+ cbi = NULL;
+ } else {
+ fc->start = READ_ONCE(fc->server_list->index);
+ }
+
+found_interest:
+ fc->index = fc->start;
+ return true;
+}
+
+/*
+ * Post volume busy note.
+ */
+static void afs_busy(struct afs_volume *volume, u32 abort_code)
+{
+ const char *m;
+
+ switch (abort_code) {
+ case VOFFLINE: m = "offline"; break;
+ case VRESTARTING: m = "restarting"; break;
+ case VSALVAGING: m = "being salvaged"; break;
+ default: m = "busy"; break;
+ }
+
+ pr_notice("kAFS: Volume %u '%s' is %s\n", volume->vid, volume->name, m);
+}
+
+/*
+ * Sleep and retry the operation to the same fileserver.
+ */
+static bool afs_sleep_and_retry(struct afs_fs_cursor *fc)
+{
+ msleep_interruptible(1000);
+ if (signal_pending(current)) {
+ fc->ac.error = -ERESTARTSYS;
+ return false;
+ }
+
+ return true;
+}
+
+/*
+ * Select the fileserver to use. May be called multiple times to rotate
+ * through the fileservers.
+ */
+bool afs_select_fileserver(struct afs_fs_cursor *fc)
+{
+ struct afs_addr_list *alist;
+ struct afs_server *server;
+ struct afs_vnode *vnode = fc->vnode;
+
+ _enter("%u/%u,%u/%u,%d,%d",
+ fc->index, fc->start,
+ fc->ac.index, fc->ac.start,
+ fc->ac.error, fc->ac.abort_code);
+
+ if (fc->flags & AFS_FS_CURSOR_STOP) {
+ _leave(" = f [stopped]");
+ return false;
+ }
+
+ /* Evaluate the result of the previous operation, if there was one. */
+ switch (fc->ac.error) {
+ case SHRT_MAX:
+ goto start;
+
+ case 0:
+ default:
+ /* Success or local failure. Stop. */
+ fc->flags |= AFS_FS_CURSOR_STOP;
+ _leave(" = f [okay/local %d]", fc->ac.error);
+ return false;
+
+ case -ECONNABORTED:
+ /* The far side rejected the operation on some grounds. This
+ * might involve the server being busy or the volume having been moved.
+ */
+ switch (fc->ac.abort_code) {
+ case VNOVOL:
+ /* This fileserver doesn't know about the volume.
+ * - May indicate that the VL is wrong - retry once and compare
+ * the results.
+ * - May indicate that the fileserver couldn't attach to the vol.
+ */
+ if (fc->flags & AFS_FS_CURSOR_VNOVOL) {
+ fc->ac.error = -EREMOTEIO;
+ goto failed;
+ }
+
+ write_lock(&vnode->volume->servers_lock);
+ fc->server_list->vnovol_mask |= 1 << fc->index;
+ write_unlock(&vnode->volume->servers_lock);
+
+ set_bit(AFS_VOLUME_NEEDS_UPDATE, &vnode->volume->flags);
+ fc->ac.error = afs_check_volume_status(vnode->volume, fc->key);
+ if (fc->ac.error < 0)
+ goto failed;
+
+ if (test_bit(AFS_VOLUME_DELETED, &vnode->volume->flags)) {
+ fc->ac.error = -ENOMEDIUM;
+ goto failed;
+ }
+
+ /* If the server list didn't change, then assume that
+ * it's the fileserver having trouble.
+ */
+ if (vnode->volume->servers == fc->server_list) {
+ fc->ac.error = -EREMOTEIO;
+ goto failed;
+ }
+
+ /* Try again */
+ fc->flags |= AFS_FS_CURSOR_VNOVOL;
+ _leave(" = t [vnovol]");
+ return true;
+
+ case VSALVAGE: /* TODO: Should this return an error or iterate? */
+ case VVOLEXISTS:
+ case VNOSERVICE:
+ case VONLINE:
+ case VDISKFULL:
+ case VOVERQUOTA:
+ fc->ac.error = afs_abort_to_error(fc->ac.abort_code);
+ goto next_server;
+
+ case VOFFLINE:
+ if (!test_and_set_bit(AFS_VOLUME_OFFLINE, &vnode->volume->flags)) {
+ afs_busy(vnode->volume, fc->ac.abort_code);
+ clear_bit(AFS_VOLUME_BUSY, &vnode->volume->flags);
+ }
+ if (fc->flags & AFS_FS_CURSOR_NO_VSLEEP) {
+ fc->ac.error = -EADV;
+ goto failed;
+ }
+ if (fc->flags & AFS_FS_CURSOR_CUR_ONLY) {
+ fc->ac.error = -ESTALE;
+ goto failed;
+ }
+ goto busy;
+
+ case VSALVAGING:
+ case VRESTARTING:
+ case VBUSY:
+ /* Retry after going round all the servers unless we
+ * have a file lock we need to maintain.
+ */
+ if (fc->flags & AFS_FS_CURSOR_NO_VSLEEP) {
+ fc->ac.error = -EBUSY;
+ goto failed;
+ }
+ if (!test_and_set_bit(AFS_VOLUME_BUSY, &vnode->volume->flags)) {
+ afs_busy(vnode->volume, fc->ac.abort_code);
+ clear_bit(AFS_VOLUME_OFFLINE, &vnode->volume->flags);
+ }
+ busy:
+ if (fc->flags & AFS_FS_CURSOR_CUR_ONLY) {
+ if (!afs_sleep_and_retry(fc))
+ goto failed;
+
+ /* Retry with same server & address */
+ _leave(" = t [vbusy]");
+ return true;
+ }
+
+ fc->flags |= AFS_FS_CURSOR_VBUSY;
+ goto next_server;
+
+ case VMOVED:
+ /* The volume migrated to another server. We consider
+ * consider all locks and callbacks broken and request
+ * an update from the VLDB.
+ *
+ * We also limit the number of VMOVED hops we will
+ * honour, just in case someone sets up a loop.
+ */
+ if (fc->flags & AFS_FS_CURSOR_VMOVED) {
+ fc->ac.error = -EREMOTEIO;
+ goto failed;
+ }
+ fc->flags |= AFS_FS_CURSOR_VMOVED;
+
+ set_bit(AFS_VOLUME_WAIT, &vnode->volume->flags);
+ set_bit(AFS_VOLUME_NEEDS_UPDATE, &vnode->volume->flags);
+ fc->ac.error = afs_check_volume_status(vnode->volume, fc->key);
+ if (fc->ac.error < 0)
+ goto failed;
+
+ /* If the server list didn't change, then the VLDB is
+ * out of sync with the fileservers. This is hopefully
+ * a temporary condition, however, so we don't want to
+ * permanently block access to the file.
+ *
+ * TODO: Try other fileservers if we can.
+ *
+ * TODO: Retry a few times with sleeps.
+ */
+ if (vnode->volume->servers == fc->server_list) {
+ fc->ac.error = -ENOMEDIUM;
+ goto failed;
+ }
+
+ goto restart_from_beginning;
+
+ default:
+ clear_bit(AFS_VOLUME_OFFLINE, &vnode->volume->flags);
+ clear_bit(AFS_VOLUME_BUSY, &vnode->volume->flags);
+ fc->ac.error = afs_abort_to_error(fc->ac.abort_code);
+ goto failed;
+ }
+
+ case -ENETUNREACH:
+ case -EHOSTUNREACH:
+ case -ECONNREFUSED:
+ case -ETIMEDOUT:
+ case -ETIME:
+ _debug("no conn");
+ goto iterate_address;
+ }
+
+restart_from_beginning:
+ _debug("restart");
+ afs_end_cursor(&fc->ac);
+ afs_put_cb_interest(afs_v2net(vnode), fc->cbi);
+ fc->cbi = NULL;
+ afs_put_serverlist(afs_v2net(vnode), fc->server_list);
+ fc->server_list = NULL;
+start:
+ _debug("start");
+ /* See if we need to do an update of the volume record. Note that the
+ * volume may have moved or even have been deleted.
+ */
+ fc->ac.error = afs_check_volume_status(vnode->volume, fc->key);
+ if (fc->ac.error < 0)
+ goto failed;
+
+ if (!afs_start_fs_iteration(fc, vnode))
+ goto failed;
+ goto use_server;
+
+next_server:
+ _debug("next");
+ afs_put_cb_interest(afs_v2net(vnode), fc->cbi);
+ fc->cbi = NULL;
+ fc->index++;
+ if (fc->index >= fc->server_list->nr_servers)
+ fc->index = 0;
+ if (fc->index != fc->start)
+ goto use_server;
+
+ /* That's all the servers poked to no good effect. Try again if some
+ * of them were busy.
+ */
+ if (fc->flags & AFS_FS_CURSOR_VBUSY)
+ goto restart_from_beginning;
+
+ fc->ac.error = -EDESTADDRREQ;
+ goto failed;
+
+use_server:
+ _debug("use");
+ /* We're starting on a different fileserver from the list. We need to
+ * check it, create a callback intercept, find its address list and
+ * probe its capabilities before we use it.
+ */
+ ASSERTCMP(fc->ac.alist, ==, NULL);
+ server = fc->server_list->servers[fc->index].server;
+
+ if (!afs_check_server_record(fc, server))
+ goto failed;
+
+ _debug("USING SERVER: %pU", &server->uuid);
+
+ /* Make sure we've got a callback interest record for this server. We
+ * have to link it in before we send the request as we can be sent a
+ * break request before we've finished decoding the reply and
+ * installing the vnode.
+ */
+ fc->ac.error = afs_register_server_cb_interest(
+ vnode, &fc->server_list->servers[fc->index]);
+ if (fc->ac.error < 0)
+ goto failed;
+
+ fc->cbi = afs_get_cb_interest(vnode->cb_interest);
+
+ read_lock(&server->fs_lock);
+ alist = rcu_dereference_protected(server->addresses,
+ lockdep_is_held(&server->fs_lock));
+ afs_get_addrlist(alist);
+ read_unlock(&server->fs_lock);
+
+
+ /* Probe the current fileserver if we haven't done so yet. */
+ if (!test_bit(AFS_SERVER_FL_PROBED, &server->flags)) {
+ fc->ac.alist = afs_get_addrlist(alist);
+
+ if (!afs_probe_fileserver(fc))
+ goto failed;
+ }
+
+ if (!fc->ac.alist)
+ fc->ac.alist = alist;
+ else
+ afs_put_addrlist(alist);
+
+ fc->ac.addr = NULL;
+ fc->ac.start = READ_ONCE(alist->index);
+ fc->ac.index = fc->ac.start;
+ fc->ac.error = 0;
+ fc->ac.begun = false;
+ goto iterate_address;
+
+iterate_address:
+ ASSERT(fc->ac.alist);
+ _debug("iterate %d/%d", fc->ac.index, fc->ac.alist->nr_addrs);
+ /* Iterate over the current server's address list to try and find an
+ * address on which it will respond to us.
+ */
+ if (afs_iterate_addresses(&fc->ac)) {
+ _leave(" = t");
+ return true;
+ }
+
+ afs_end_cursor(&fc->ac);
+ goto next_server;
+
+failed:
+ fc->flags |= AFS_FS_CURSOR_STOP;
+ _leave(" = f [failed %d]", fc->ac.error);
+ return false;
+}
+
+/*
+ * Select the same fileserver we used for a vnode before and only that
+ * fileserver. We use this when we have a lock on that file, which is backed
+ * only by the fileserver we obtained it from.
+ */
+bool afs_select_current_fileserver(struct afs_fs_cursor *fc)
+{
+ struct afs_vnode *vnode = fc->vnode;
+ struct afs_cb_interest *cbi = vnode->cb_interest;
+ struct afs_addr_list *alist;
+
+ _enter("");
+
+ if (!cbi) {
+ fc->ac.error = -ESTALE;
+ fc->flags |= AFS_FS_CURSOR_STOP;
+ return false;
+ }
+
+ read_lock(&cbi->server->fs_lock);
+ alist = afs_get_addrlist(cbi->server->addresses);
+ read_unlock(&cbi->server->fs_lock);
+ if (!alist) {
+ fc->ac.error = -ESTALE;
+ fc->flags |= AFS_FS_CURSOR_STOP;
+ return false;
+ }
+
+ fc->ac.alist = alist;
+ fc->ac.error = 0;
+ return true;
+}
+
+/*
+ * Tidy up a filesystem cursor and unlock the vnode.
+ */
+int afs_end_vnode_operation(struct afs_fs_cursor *fc)
+{
+ struct afs_net *net = afs_v2net(fc->vnode);
+ int ret;
+
+ mutex_unlock(&fc->vnode->io_lock);
+
+ afs_end_cursor(&fc->ac);
+ afs_put_cb_interest(net, fc->cbi);
+ afs_put_serverlist(net, fc->server_list);
+
+ ret = fc->ac.error;
+ if (ret == -ECONNABORTED)
+ afs_abort_to_error(fc->ac.abort_code);
+
+ return fc->ac.error;
+}
+
+#if 0
/*
* Set a filesystem server cursor for using a specific FS server.
*/
afs_put_server(net, fc->server);
return fc->ac.error;
}
+
+#endif
struct workqueue_struct *afs_async_calls;
static void afs_wake_up_call_waiter(struct sock *, struct rxrpc_call *, unsigned long);
-static long afs_wait_for_call_to_complete(struct afs_call *);
+static long afs_wait_for_call_to_complete(struct afs_call *, struct afs_addr_cursor *);
static void afs_wake_up_async_call(struct sock *, struct rxrpc_call *, unsigned long);
static void afs_process_async_call(struct work_struct *);
static void afs_rx_new_call(struct sock *, struct rxrpc_call *, unsigned long);
call->type->destructor(call);
afs_put_server(call->net, call->cm_server);
+ afs_put_cb_interest(call->net, call->cbi);
kfree(call->request);
kfree(call);
struct kvec iov[1];
size_t offset;
s64 tx_total_len;
- u32 abort_code;
int ret;
_enter(",{%pISp},", &srx->transport);
afs_wake_up_async_call :
afs_wake_up_call_waiter),
call->upgrade);
- call->key = NULL;
if (IS_ERR(rxcall)) {
ret = PTR_ERR(rxcall);
goto error_kill_call;
if (call->async)
return -EINPROGRESS;
- return afs_wait_for_call_to_complete(call);
+ return afs_wait_for_call_to_complete(call, ac);
error_do_abort:
call->state = AFS_CALL_COMPLETE;
rxrpc_kernel_abort_call(call->net->socket, rxcall,
RX_USER_ABORT, ret, "KSD");
} else {
- abort_code = 0;
offset = 0;
rxrpc_kernel_recv_data(call->net->socket, rxcall, NULL,
0, &offset, false, &call->abort_code,
&call->service_id);
- ret = afs_abort_to_error(call->abort_code);
+ ac->abort_code = call->abort_code;
+ ac->responded = true;
}
error_kill_call:
afs_put_call(call);
+ ac->error = ret;
_leave(" = %d", ret);
return ret;
}
/*
* wait synchronously for a call to complete
*/
-static long afs_wait_for_call_to_complete(struct afs_call *call)
+static long afs_wait_for_call_to_complete(struct afs_call *call,
+ struct afs_addr_cursor *ac)
{
signed long rtt2, timeout;
long ret;
/* Kill off the call if it's still live. */
if (call->state < AFS_CALL_COMPLETE) {
_debug("call interrupted");
- rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
- RX_USER_ABORT, -EINTR, "KWI");
+ if (rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
+ RX_USER_ABORT, -EINTR, "KWI"))
+ call->error = -ERESTARTSYS;
}
- ret = call->error;
- if (ret < 0) {
- ret = afs_abort_to_error(call->abort_code);
- } else if (ret == 0 && call->ret_reply0) {
- ret = (long)call->reply[0];
- call->reply[0] = NULL;
+ ac->abort_code = call->abort_code;
+ ac->error = call->error;
+
+ ret = ac->error;
+ switch (ret) {
+ case 0:
+ if (call->ret_reply0) {
+ ret = (long)call->reply[0];
+ call->reply[0] = NULL;
+ }
+ /* Fall through */
+ case -ECONNABORTED:
+ ac->responded = true;
+ break;
}
_debug("call complete");
return 0;
}
- if (ret == -ECONNABORTED)
- call->error = afs_abort_to_error(call->abort_code);
- else
- call->error = ret;
+ call->error = ret;
call->state = AFS_CALL_COMPLETE;
return ret;
}
*/
_debug("no valid permit");
- ret = afs_vnode_fetch_status(vnode, key, true);
+ ret = afs_fetch_status(vnode, key);
if (ret < 0) {
*_access = 0;
_leave(" = %d", ret);
#include "afs_fs.h"
#include "internal.h"
-static unsigned afs_server_timeout = 10; /* server timeout in seconds */
+static unsigned afs_server_gc_delay = 10; /* Server record timeout in seconds */
+static unsigned afs_server_update_delay = 30; /* Time till VLDB recheck in secs */
static void afs_inc_servers_outstanding(struct afs_net *net)
{
wake_up_atomic_t(&net->servers_outstanding);
}
-void afs_server_timer(struct timer_list *timer)
+/*
+ * Find a server by one of its addresses.
+ */
+struct afs_server *afs_find_server(struct afs_net *net,
+ const struct sockaddr_rxrpc *srx)
{
- struct afs_net *net = container_of(timer, struct afs_net, server_timer);
+ const struct sockaddr_in6 *a = &srx->transport.sin6, *b;
+ const struct afs_addr_list *alist;
+ struct afs_server *server = NULL;
+ unsigned int i;
+ bool ipv6 = true;
+ int seq = 0, diff;
+
+ if (srx->transport.sin6.sin6_addr.s6_addr32[0] == 0 ||
+ srx->transport.sin6.sin6_addr.s6_addr32[1] == 0 ||
+ srx->transport.sin6.sin6_addr.s6_addr32[2] == htonl(0xffff))
+ ipv6 = false;
+
+ rcu_read_lock();
+
+ do {
+ if (server)
+ afs_put_server(net, server);
+ server = NULL;
+ read_seqbegin_or_lock(&net->fs_addr_lock, &seq);
+
+ if (ipv6) {
+ hlist_for_each_entry_rcu(server, &net->fs_addresses6, addr6_link) {
+ alist = rcu_dereference(server->addresses);
+ for (i = alist->nr_ipv4; i < alist->nr_addrs; i++) {
+ b = &alist->addrs[i].transport.sin6;
+ diff = (u16)a->sin6_port - (u16)b->sin6_port;
+ if (diff == 0)
+ diff = memcmp(&a->sin6_addr,
+ &b->sin6_addr,
+ sizeof(struct in6_addr));
+ if (diff == 0)
+ goto found;
+ if (diff < 0) {
+ // TODO: Sort the list
+ //if (i == alist->nr_ipv4)
+ // goto not_found;
+ break;
+ }
+ }
+ }
+ } else {
+ hlist_for_each_entry_rcu(server, &net->fs_addresses4, addr4_link) {
+ alist = rcu_dereference(server->addresses);
+ for (i = 0; i < alist->nr_ipv4; i++) {
+ b = &alist->addrs[i].transport.sin6;
+ diff = (u16)a->sin6_port - (u16)b->sin6_port;
+ if (diff == 0)
+ diff = ((u32)a->sin6_addr.s6_addr32[3] -
+ (u32)b->sin6_addr.s6_addr32[3]);
+ if (diff == 0)
+ goto found;
+ if (diff < 0) {
+ // TODO: Sort the list
+ //if (i == 0)
+ // goto not_found;
+ break;
+ }
+ }
+ }
+ }
- if (!queue_work(afs_wq, &net->server_reaper))
- afs_dec_servers_outstanding(net);
+ //not_found:
+ server = NULL;
+ found:
+ if (server && !atomic_inc_not_zero(&server->usage))
+ server = NULL;
+
+ } while (need_seqretry(&net->fs_addr_lock, seq));
+
+ done_seqretry(&net->fs_addr_lock, seq);
+
+ rcu_read_unlock();
+ return server;
}
/*
- * install a server record in the master tree
+ * Look up a server by its UUID
*/
-static int afs_install_server(struct afs_server *server)
+struct afs_server *afs_find_server_by_uuid(struct afs_net *net, const uuid_t *uuid)
{
- struct afs_server *xserver;
- struct afs_net *net = server->cell->net;
+ struct afs_server *server = NULL;
+ struct rb_node *p;
+ int diff, seq = 0;
+
+ _enter("%pU", uuid);
+
+ do {
+ /* Unfortunately, rbtree walking doesn't give reliable results
+ * under just the RCU read lock, so we have to check for
+ * changes.
+ */
+ if (server)
+ afs_put_server(net, server);
+ server = NULL;
+
+ read_seqbegin_or_lock(&net->fs_lock, &seq);
+
+ p = net->fs_servers.rb_node;
+ while (p) {
+ server = rb_entry(p, struct afs_server, uuid_rb);
+
+ diff = memcmp(uuid, &server->uuid, sizeof(*uuid));
+ if (diff < 0) {
+ p = p->rb_left;
+ } else if (diff > 0) {
+ p = p->rb_right;
+ } else {
+ afs_get_server(server);
+ break;
+ }
+
+ server = NULL;
+ }
+ } while (need_seqretry(&net->fs_lock, seq));
+
+ done_seqretry(&net->fs_lock, seq);
+
+ _leave(" = %p", server);
+ return server;
+}
+
+/*
+ * Install a server record in the namespace tree
+ */
+static struct afs_server *afs_install_server(struct afs_net *net,
+ struct afs_server *candidate)
+{
+ const struct afs_addr_list *alist;
+ struct afs_server *server;
struct rb_node **pp, *p;
- int ret, diff;
+ int ret = -EEXIST, diff;
- _enter("%p", server);
+ _enter("%p", candidate);
- write_lock(&net->servers_lock);
+ write_seqlock(&net->fs_lock);
- ret = -EEXIST;
- pp = &net->servers.rb_node;
+ /* Firstly install the server in the UUID lookup tree */
+ pp = &net->fs_servers.rb_node;
p = NULL;
while (*pp) {
p = *pp;
_debug("- consider %p", p);
- xserver = rb_entry(p, struct afs_server, master_rb);
- diff = memcmp(&server->addrs->addrs[0],
- &xserver->addrs->addrs[0],
- sizeof(sizeof(server->addrs->addrs[0])));
+ server = rb_entry(p, struct afs_server, uuid_rb);
+ diff = memcmp(&candidate->uuid, &server->uuid, sizeof(uuid_t));
if (diff < 0)
pp = &(*pp)->rb_left;
else if (diff > 0)
pp = &(*pp)->rb_right;
else
- goto error;
+ goto exists;
}
- rb_link_node(&server->master_rb, p, pp);
- rb_insert_color(&server->master_rb, &net->servers);
+ server = candidate;
+ rb_link_node(&server->uuid_rb, p, pp);
+ rb_insert_color(&server->uuid_rb, &net->fs_servers);
+ hlist_add_head_rcu(&server->proc_link, &net->fs_proc);
+
+ write_seqlock(&net->fs_addr_lock);
+ alist = rcu_dereference_protected(server->addresses,
+ lockdep_is_held(&net->fs_addr_lock.lock));
+
+ /* Secondly, if the server has any IPv4 and/or IPv6 addresses, install
+ * it in the IPv4 and/or IPv6 reverse-map lists.
+ *
+ * TODO: For speed we want to use something other than a flat list
+ * here; even sorting the list in terms of lowest address would help a
+ * bit, but anything we might want to do gets messy and memory
+ * intensive.
+ */
+ if (alist->nr_ipv4 > 0)
+ hlist_add_head_rcu(&server->addr4_link, &net->fs_addresses4);
+ if (alist->nr_addrs > alist->nr_ipv4)
+ hlist_add_head_rcu(&server->addr6_link, &net->fs_addresses6);
+
+ write_sequnlock(&net->fs_addr_lock);
ret = 0;
-error:
- write_unlock(&net->servers_lock);
- return ret;
+exists:
+ afs_get_server(server);
+ write_sequnlock(&net->fs_lock);
+ return server;
}
/*
* allocate a new server record
*/
-static struct afs_server *afs_alloc_server(struct afs_cell *cell,
- const struct sockaddr_rxrpc *addr)
+static struct afs_server *afs_alloc_server(struct afs_net *net,
+ const uuid_t *uuid,
+ struct afs_addr_list *alist)
{
struct afs_server *server;
server = kzalloc(sizeof(struct afs_server), GFP_KERNEL);
if (!server)
goto enomem;
- server->addrs = kzalloc(sizeof(struct afs_addr_list) +
- sizeof(struct sockaddr_rxrpc),
- GFP_KERNEL);
- if (!server->addrs)
- goto enomem_server;
atomic_set(&server->usage, 1);
- server->net = cell->net;
- server->cell = cell;
-
- INIT_LIST_HEAD(&server->link);
- INIT_LIST_HEAD(&server->grave);
- init_rwsem(&server->sem);
- spin_lock_init(&server->fs_lock);
+ RCU_INIT_POINTER(server->addresses, alist);
+ server->addr_version = alist->version;
+ server->uuid = *uuid;
+ server->flags = (1UL << AFS_SERVER_FL_NEW);
+ server->update_at = ktime_get_real_seconds() + afs_server_update_delay;
+ rwlock_init(&server->fs_lock);
INIT_LIST_HEAD(&server->cb_interests);
rwlock_init(&server->cb_break_lock);
- refcount_set(&server->addrs->usage, 1);
- server->addrs->nr_addrs = 1;
- server->addrs->addrs[0] = *addr;
- afs_inc_servers_outstanding(cell->net);
-
- _leave(" = %p{%d}", server, atomic_read(&server->usage));
+ afs_inc_servers_outstanding(net);
+ _leave(" = %p", server);
return server;
-enomem_server:
- kfree(server);
enomem:
_leave(" = NULL [nomem]");
return NULL;
}
/*
- * get an FS-server record for a cell
+ * Look up an address record for a server
*/
-struct afs_server *afs_lookup_server(struct afs_cell *cell,
- struct sockaddr_rxrpc *addr)
+static struct afs_addr_list *afs_vl_lookup_addrs(struct afs_cell *cell,
+ struct key *key, const uuid_t *uuid)
{
- struct afs_server *server, *candidate;
-
- _enter("%p,%pIS", cell, &addr->transport);
-
- /* quick scan of the list to see if we already have the server */
- read_lock(&cell->servers_lock);
-
- list_for_each_entry(server, &cell->servers, link) {
- if (memcmp(&server->addrs->addrs[0], addr, sizeof(*addr)) == 0)
- goto found_server_quickly;
- }
- read_unlock(&cell->servers_lock);
-
- candidate = afs_alloc_server(cell, addr);
- if (!candidate) {
- _leave(" = -ENOMEM");
- return ERR_PTR(-ENOMEM);
- }
-
- write_lock(&cell->servers_lock);
-
- /* check the cell's server list again */
- list_for_each_entry(server, &cell->servers, link) {
- if (memcmp(&server->addrs->addrs[0], addr, sizeof(*addr)) == 0)
- goto found_server;
- }
-
- _debug("new");
- server = candidate;
- if (afs_install_server(server) < 0)
- goto server_in_two_cells;
-
- afs_get_cell(cell);
- list_add_tail(&server->link, &cell->servers);
-
- write_unlock(&cell->servers_lock);
- _leave(" = %p{%d}", server, atomic_read(&server->usage));
- return server;
-
- /* found a matching server quickly */
-found_server_quickly:
- _debug("found quickly");
- afs_get_server(server);
- read_unlock(&cell->servers_lock);
-no_longer_unused:
- if (!list_empty(&server->grave)) {
- spin_lock(&cell->net->server_graveyard_lock);
- list_del_init(&server->grave);
- spin_unlock(&cell->net->server_graveyard_lock);
+ struct afs_addr_cursor ac;
+ struct afs_addr_list *alist;
+ int ret;
+
+ ret = afs_set_vl_cursor(&ac, cell);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ while (afs_iterate_addresses(&ac)) {
+ alist = afs_vl_get_addrs_u(cell->net, &ac, key, uuid);
+ switch (ac.error) {
+ case 0:
+ afs_end_cursor(&ac);
+ return alist;
+ case -ECONNABORTED:
+ ac.error = afs_abort_to_error(ac.abort_code);
+ goto error;
+ case -ENOMEM:
+ case -ENONET:
+ goto error;
+ case -ENETUNREACH:
+ case -EHOSTUNREACH:
+ case -ECONNREFUSED:
+ break;
+ default:
+ ac.error = -EIO;
+ goto error;
+ }
}
- _leave(" = %p{%d}", server, atomic_read(&server->usage));
- return server;
- /* found a matching server on the second pass */
-found_server:
- _debug("found");
- afs_get_server(server);
- write_unlock(&cell->servers_lock);
- kfree(candidate);
- goto no_longer_unused;
-
- /* found a server that seems to be in two cells */
-server_in_two_cells:
- write_unlock(&cell->servers_lock);
- kfree(candidate);
- afs_dec_servers_outstanding(cell->net);
- printk(KERN_NOTICE "kAFS: Server %pI4 appears to be in two cells\n",
- addr);
- _leave(" = -EEXIST");
- return ERR_PTR(-EEXIST);
+error:
+ return ERR_PTR(afs_end_cursor(&ac));
}
/*
- * look up a server by its IP address
+ * Get or create a fileserver record.
*/
-struct afs_server *afs_find_server(struct afs_net *net,
- const struct sockaddr_rxrpc *srx)
+struct afs_server *afs_lookup_server(struct afs_cell *cell, struct key *key,
+ const uuid_t *uuid)
{
- struct afs_server *server = NULL;
- struct rb_node *p;
- int diff;
+ struct afs_addr_list *alist;
+ struct afs_server *server, *candidate;
- _enter("{%d,%pIS}", srx->transport.family, &srx->transport);
+ _enter("%p,%pU", cell->net, uuid);
- read_lock(&net->servers_lock);
+ server = afs_find_server_by_uuid(cell->net, uuid);
+ if (server)
+ return server;
- p = net->servers.rb_node;
- while (p) {
- server = rb_entry(p, struct afs_server, master_rb);
+ alist = afs_vl_lookup_addrs(cell, key, uuid);
+ if (IS_ERR(alist))
+ return ERR_CAST(alist);
- _debug("- consider %p", p);
+ candidate = afs_alloc_server(cell->net, uuid, alist);
+ if (!candidate) {
+ afs_put_addrlist(alist);
+ return ERR_PTR(-ENOMEM);
+ }
- diff = memcmp(srx, &server->addrs->addrs[0], sizeof(*srx));
- if (diff < 0) {
- p = p->rb_left;
- } else if (diff > 0) {
- p = p->rb_right;
- } else {
- afs_get_server(server);
- goto found;
- }
+ server = afs_install_server(cell->net, candidate);
+ if (server != candidate) {
+ afs_put_addrlist(alist);
+ kfree(candidate);
}
- server = NULL;
-found:
- read_unlock(&net->servers_lock);
- _leave(" = %p", server);
+ _leave(" = %p{%d}", server, atomic_read(&server->usage));
return server;
}
+/*
+ * Set the server timer to fire after a given delay, assuming it's not already
+ * set for an earlier time.
+ */
static void afs_set_server_timer(struct afs_net *net, time64_t delay)
{
- afs_inc_servers_outstanding(net);
if (net->live) {
- if (timer_reduce(&net->server_timer, jiffies + delay * HZ))
- afs_dec_servers_outstanding(net);
- } else {
- if (!queue_work(afs_wq, &net->server_reaper))
+ afs_inc_servers_outstanding(net);
+ if (timer_reduce(&net->fs_timer, jiffies + delay * HZ))
afs_dec_servers_outstanding(net);
}
}
/*
- * destroy a server record
- * - removes from the cell list
+ * Server management timer. We have an increment on fs_outstanding that we
+ * need to pass along to the work item.
+ */
+void afs_servers_timer(struct timer_list *timer)
+{
+ struct afs_net *net = container_of(timer, struct afs_net, fs_timer);
+
+ _enter("");
+ if (!queue_work(afs_wq, &net->fs_manager))
+ afs_dec_servers_outstanding(net);
+}
+
+/*
+ * Release a reference on a server record.
*/
void afs_put_server(struct afs_net *net, struct afs_server *server)
{
+ unsigned int usage;
+
if (!server)
return;
- _enter("%p{%d}", server, atomic_read(&server->usage));
+ server->put_time = ktime_get_real_seconds();
- _debug("PUT SERVER %d", atomic_read(&server->usage));
+ usage = atomic_dec_return(&server->usage);
- ASSERTCMP(atomic_read(&server->usage), >, 0);
+ _enter("{%u}", usage);
- if (likely(!atomic_dec_and_test(&server->usage))) {
- _leave("");
+ if (likely(usage > 0))
return;
- }
- spin_lock(&net->server_graveyard_lock);
- if (atomic_read(&server->usage) == 0) {
- list_move_tail(&server->grave, &net->server_graveyard);
- server->time_of_death = ktime_get_real_seconds();
- afs_set_server_timer(net, afs_server_timeout);
- }
- spin_unlock(&net->server_graveyard_lock);
- _leave(" [dead]");
+ afs_set_server_timer(net, afs_server_gc_delay);
+}
+
+static void afs_server_rcu(struct rcu_head *rcu)
+{
+ struct afs_server *server = container_of(rcu, struct afs_server, rcu);
+
+ afs_put_addrlist(server->addresses);
+ kfree(server);
}
/*
*/
static void afs_destroy_server(struct afs_net *net, struct afs_server *server)
{
- struct afs_addr_list *alist = server->addrs;
+ struct afs_addr_list *alist = server->addresses;
struct afs_addr_cursor ac = {
.alist = alist,
.addr = &alist->addrs[0],
};
_enter("%p", server);
- afs_fs_give_up_all_callbacks(server, &ac, NULL, false);
- afs_put_cell(net, server->cell);
- afs_put_addrlist(server->addrs);
- kfree(server);
+ afs_fs_give_up_all_callbacks(net, server, &ac, NULL);
+ call_rcu(&server->rcu, afs_server_rcu);
afs_dec_servers_outstanding(net);
}
/*
- * reap dead server records
+ * Garbage collect any expired servers.
*/
-void afs_reap_server(struct work_struct *work)
+static void afs_gc_servers(struct afs_net *net, struct afs_server *gc_list)
{
- LIST_HEAD(corpses);
struct afs_server *server;
- struct afs_net *net = container_of(work, struct afs_net, server_reaper);
- unsigned long delay, expiry;
- time64_t now;
-
- now = ktime_get_real_seconds();
- spin_lock(&net->server_graveyard_lock);
-
- while (!list_empty(&net->server_graveyard)) {
- server = list_entry(net->server_graveyard.next,
- struct afs_server, grave);
-
- /* the queue is ordered most dead first */
- if (net->live) {
- expiry = server->time_of_death + afs_server_timeout;
- if (expiry > now) {
- delay = (expiry - now);
- afs_set_server_timer(net, delay);
- break;
- }
+ bool deleted;
+ int usage;
+
+ while ((server = gc_list)) {
+ gc_list = server->gc_next;
+
+ write_seqlock(&net->fs_lock);
+ usage = 1;
+ deleted = atomic_try_cmpxchg(&server->usage, &usage, 0);
+ if (deleted) {
+ rb_erase(&server->uuid_rb, &net->fs_servers);
+ hlist_del_rcu(&server->proc_link);
}
+ write_sequnlock(&net->fs_lock);
- write_lock(&server->cell->servers_lock);
- write_lock(&net->servers_lock);
- if (atomic_read(&server->usage) > 0) {
- list_del_init(&server->grave);
- } else {
- list_move_tail(&server->grave, &corpses);
- list_del_init(&server->link);
- rb_erase(&server->master_rb, &net->servers);
+ if (deleted)
+ afs_destroy_server(net, server);
+ }
+}
+
+/*
+ * Manage the records of servers known to be within a network namespace. This
+ * includes garbage collecting unused servers.
+ *
+ * Note also that we were given an increment on net->servers_outstanding by
+ * whoever queued us that we need to deal with before returning.
+ */
+void afs_manage_servers(struct work_struct *work)
+{
+ struct afs_net *net = container_of(work, struct afs_net, fs_manager);
+ struct afs_server *gc_list = NULL;
+ struct rb_node *cursor;
+ time64_t now = ktime_get_real_seconds(), next_manage = TIME64_MAX;
+ bool purging = !net->live;
+
+ _enter("");
+
+ /* Trawl the server list looking for servers that have expired from
+ * lack of use.
+ */
+ read_seqlock_excl(&net->fs_lock);
+
+ for (cursor = rb_first(&net->fs_servers); cursor; cursor = rb_next(cursor)) {
+ struct afs_server *server =
+ rb_entry(cursor, struct afs_server, uuid_rb);
+ int usage = atomic_read(&server->usage);
+
+ _debug("manage %pU %u", &server->uuid, usage);
+
+ ASSERTCMP(usage, >=, 1);
+ ASSERTIFCMP(purging, usage, ==, 1);
+
+ if (usage == 1) {
+ time64_t expire_at = server->put_time;
+
+ if (!test_bit(AFS_SERVER_FL_VL_FAIL, &server->flags) &&
+ !test_bit(AFS_SERVER_FL_NOT_FOUND, &server->flags))
+ expire_at += afs_server_gc_delay;
+ if (purging || expire_at <= now) {
+ server->gc_next = gc_list;
+ gc_list = server;
+ } else if (expire_at < next_manage) {
+ next_manage = expire_at;
+ }
}
- write_unlock(&net->servers_lock);
- write_unlock(&server->cell->servers_lock);
}
- spin_unlock(&net->server_graveyard_lock);
+ read_sequnlock_excl(&net->fs_lock);
- /* now reap the corpses we've extracted */
- while (!list_empty(&corpses)) {
- server = list_entry(corpses.next, struct afs_server, grave);
- list_del(&server->grave);
- afs_destroy_server(net, server);
+ /* Update the timer on the way out. We have to pass an increment on
+ * servers_outstanding in the namespace that we are in to the timer or
+ * the work scheduler.
+ */
+ if (!purging && next_manage < TIME64_MAX) {
+ now = ktime_get_real_seconds();
+
+ if (next_manage - now <= 0) {
+ if (queue_work(afs_wq, &net->fs_manager))
+ afs_inc_servers_outstanding(net);
+ } else {
+ afs_set_server_timer(net, next_manage - now);
+ }
}
+ afs_gc_servers(net, gc_list);
+
afs_dec_servers_outstanding(net);
+ _leave(" [%d]", atomic_read(&net->servers_outstanding));
+}
+
+static void afs_queue_server_manager(struct afs_net *net)
+{
+ afs_inc_servers_outstanding(net);
+ if (!queue_work(afs_wq, &net->fs_manager))
+ afs_dec_servers_outstanding(net);
}
/*
- * Discard all the server records from a net namespace when it is destroyed or
- * the afs module is removed.
+ * Purge list of servers.
*/
-void __net_exit afs_purge_servers(struct afs_net *net)
+void afs_purge_servers(struct afs_net *net)
{
- if (del_timer_sync(&net->server_timer))
+ _enter("");
+
+ if (del_timer_sync(&net->fs_timer))
atomic_dec(&net->servers_outstanding);
- afs_inc_servers_outstanding(net);
- if (!queue_work(afs_wq, &net->server_reaper))
- afs_dec_servers_outstanding(net);
+ afs_queue_server_manager(net);
+ _debug("wait");
wait_on_atomic_t(&net->servers_outstanding, atomic_t_wait,
TASK_UNINTERRUPTIBLE);
+ _leave("");
+}
+
+/*
+ * Probe a fileserver to find its capabilities.
+ *
+ * TODO: Try service upgrade.
+ */
+static bool afs_do_probe_fileserver(struct afs_fs_cursor *fc)
+{
+ _enter("");
+
+ fc->ac.addr = NULL;
+ fc->ac.start = READ_ONCE(fc->ac.alist->index);
+ fc->ac.index = fc->ac.start;
+ fc->ac.error = 0;
+ fc->ac.begun = false;
+
+ while (afs_iterate_addresses(&fc->ac)) {
+ afs_fs_get_capabilities(afs_v2net(fc->vnode), fc->cbi->server,
+ &fc->ac, fc->key);
+ switch (fc->ac.error) {
+ case 0:
+ afs_end_cursor(&fc->ac);
+ set_bit(AFS_SERVER_FL_PROBED, &fc->cbi->server->flags);
+ return true;
+ case -ECONNABORTED:
+ fc->ac.error = afs_abort_to_error(fc->ac.abort_code);
+ goto error;
+ case -ENOMEM:
+ case -ENONET:
+ goto error;
+ case -ENETUNREACH:
+ case -EHOSTUNREACH:
+ case -ECONNREFUSED:
+ case -ETIMEDOUT:
+ case -ETIME:
+ break;
+ default:
+ fc->ac.error = -EIO;
+ goto error;
+ }
+ }
+
+error:
+ afs_end_cursor(&fc->ac);
+ return false;
+}
+
+/*
+ * If we haven't already, try probing the fileserver to get its capabilities.
+ * We try not to instigate parallel probes, but it's possible that the parallel
+ * probes will fail due to authentication failure when ours would succeed.
+ *
+ * TODO: Try sending an anonymous probe if an authenticated probe fails.
+ */
+bool afs_probe_fileserver(struct afs_fs_cursor *fc)
+{
+ bool success;
+ int ret, retries = 0;
+
+ _enter("");
+
+retry:
+ if (test_bit(AFS_SERVER_FL_PROBED, &fc->cbi->server->flags)) {
+ _leave(" = t");
+ return true;
+ }
+
+ if (!test_and_set_bit_lock(AFS_SERVER_FL_PROBING, &fc->cbi->server->flags)) {
+ success = afs_do_probe_fileserver(fc);
+ clear_bit_unlock(AFS_SERVER_FL_PROBING, &fc->cbi->server->flags);
+ wake_up_bit(&fc->cbi->server->flags, AFS_SERVER_FL_PROBING);
+ _leave(" = t");
+ return success;
+ }
+
+ _debug("wait");
+ ret = wait_on_bit(&fc->cbi->server->flags, AFS_SERVER_FL_PROBING,
+ TASK_INTERRUPTIBLE);
+ if (ret == -ERESTARTSYS) {
+ fc->ac.error = ret;
+ _leave(" = f [%d]", ret);
+ return false;
+ }
+
+ retries++;
+ if (retries == 4) {
+ fc->ac.error = -ESTALE;
+ _leave(" = f [stale]");
+ return false;
+ }
+ _debug("retry");
+ goto retry;
+}
+
+/*
+ * Get an update for a server's address list.
+ */
+static noinline bool afs_update_server_record(struct afs_fs_cursor *fc, struct afs_server *server)
+{
+ struct afs_addr_list *alist, *discard;
+
+ _enter("");
+
+ alist = afs_vl_lookup_addrs(fc->vnode->volume->cell, fc->key,
+ &server->uuid);
+ if (IS_ERR(alist)) {
+ fc->ac.error = PTR_ERR(alist);
+ _leave(" = f [%d]", fc->ac.error);
+ return false;
+ }
+
+ discard = alist;
+ if (server->addr_version != alist->version) {
+ write_lock(&server->fs_lock);
+ discard = rcu_dereference_protected(server->addresses,
+ lockdep_is_held(&server->fs_lock));
+ rcu_assign_pointer(server->addresses, alist);
+ server->addr_version = alist->version;
+ write_unlock(&server->fs_lock);
+ }
+
+ server->update_at = ktime_get_real_seconds() + afs_server_update_delay;
+ afs_put_addrlist(discard);
+ _leave(" = t");
+ return true;
+}
+
+/*
+ * See if a server's address list needs updating.
+ */
+bool afs_check_server_record(struct afs_fs_cursor *fc, struct afs_server *server)
+{
+ time64_t now = ktime_get_real_seconds();
+ long diff;
+ bool success;
+ int ret, retries = 0;
+
+ _enter("");
+
+ ASSERT(server);
+
+retry:
+ diff = READ_ONCE(server->update_at) - now;
+ if (diff > 0) {
+ _leave(" = t [not now %ld]", diff);
+ return true;
+ }
+
+ if (!test_and_set_bit_lock(AFS_SERVER_FL_UPDATING, &server->flags)) {
+ success = afs_update_server_record(fc, server);
+ clear_bit_unlock(AFS_SERVER_FL_UPDATING, &server->flags);
+ wake_up_bit(&server->flags, AFS_SERVER_FL_UPDATING);
+ _leave(" = %d", success);
+ return success;
+ }
+
+ ret = wait_on_bit(&server->flags, AFS_SERVER_FL_UPDATING,
+ TASK_INTERRUPTIBLE);
+ if (ret == -ERESTARTSYS) {
+ fc->ac.error = ret;
+ _leave(" = f [intr]");
+ return false;
+ }
+
+ retries++;
+ if (retries == 4) {
+ _leave(" = f [stale]");
+ ret = -ESTALE;
+ return false;
+ }
+ goto retry;
}
--- /dev/null
+/* AFS fileserver list management.
+ *
+ * Copyright (C) 2017 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include "internal.h"
+
+void afs_put_serverlist(struct afs_net *net, struct afs_server_list *slist)
+{
+ int i;
+
+ if (refcount_dec_and_test(&slist->usage)) {
+ for (i = 0; i < slist->nr_servers; i++) {
+ afs_put_cb_interest(net, slist->servers[i].cb_interest);
+ afs_put_server(net, slist->servers[i].server);
+ }
+ kfree(slist);
+ }
+}
+
+/*
+ * Build a server list from a VLDB record.
+ */
+struct afs_server_list *afs_alloc_server_list(struct afs_cell *cell,
+ struct key *key,
+ struct afs_vldb_entry *vldb,
+ u8 type_mask)
+{
+ struct afs_server_list *slist;
+ struct afs_server *server;
+ int ret = -ENOMEM, nr_servers = 0, i, j;
+
+ for (i = 0; i < vldb->nr_servers; i++)
+ if (vldb->fs_mask[i] & type_mask)
+ nr_servers++;
+
+ slist = kzalloc(sizeof(struct afs_server_list) +
+ sizeof(struct afs_server_entry) * nr_servers,
+ GFP_KERNEL);
+ if (!slist)
+ goto error;
+
+ refcount_set(&slist->usage, 1);
+
+ /* Make sure a records exists for each server in the list. */
+ for (i = 0; i < vldb->nr_servers; i++) {
+ if (!(vldb->fs_mask[i] & type_mask))
+ continue;
+
+ server = afs_lookup_server(cell, key, &vldb->fs_server[i]);
+ if (IS_ERR(server)) {
+ ret = PTR_ERR(server);
+ if (ret == -ENOENT)
+ continue;
+ goto error_2;
+ }
+
+ /* Insertion-sort by server pointer */
+ for (j = 0; j < slist->nr_servers; j++)
+ if (slist->servers[j].server >= server)
+ break;
+ if (j < slist->nr_servers) {
+ if (slist->servers[j].server == server) {
+ afs_put_server(cell->net, server);
+ continue;
+ }
+
+ memmove(slist->servers + j + 1,
+ slist->servers + j,
+ (slist->nr_servers - j) * sizeof(struct afs_server_entry));
+ }
+
+ slist->servers[j].server = server;
+ slist->nr_servers++;
+ }
+
+ if (slist->nr_servers == 0) {
+ ret = -EDESTADDRREQ;
+ goto error_2;
+ }
+
+ return slist;
+
+error_2:
+ afs_put_serverlist(cell->net, slist);
+error:
+ return ERR_PTR(ret);
+}
+
+/*
+ * Copy the annotations from an old server list to its potential replacement.
+ */
+bool afs_annotate_server_list(struct afs_server_list *new,
+ struct afs_server_list *old)
+{
+ struct afs_server *cur;
+ int i, j;
+
+ if (old->nr_servers != new->nr_servers)
+ goto changed;
+
+ for (i = 0; i < old->nr_servers; i++)
+ if (old->servers[i].server != new->servers[i].server)
+ goto changed;
+
+ return false;
+
+changed:
+ /* Maintain the same current server as before if possible. */
+ cur = old->servers[old->index].server;
+ for (j = 0; j < new->nr_servers; j++) {
+ if (new->servers[j].server == cur) {
+ new->index = j;
+ break;
+ }
+ }
+
+ /* Keep the old callback interest records where possible so that we
+ * maintain callback interception.
+ */
+ i = 0;
+ j = 0;
+ while (i < old->nr_servers && j < new->nr_servers) {
+ if (new->servers[j].server == old->servers[i].server) {
+ struct afs_cb_interest *cbi = old->servers[i].cb_interest;
+ if (cbi) {
+ new->servers[j].cb_interest = cbi;
+ refcount_inc(&cbi->usage);
+ }
+ i++;
+ j++;
+ continue;
+ }
+
+ if (new->servers[j].server < old->servers[i].server) {
+ j++;
+ continue;
+ }
+
+ i++;
+ continue;
+ }
+
+ return true;
+}
*/
static int afs_show_devname(struct seq_file *m, struct dentry *root)
{
- struct afs_super_info *as = root->d_sb->s_fs_info;
+ struct afs_super_info *as = AFS_FS_S(root->d_sb);
struct afs_volume *volume = as->volume;
- struct afs_cell *cell = volume->cell;
+ struct afs_cell *cell = as->cell;
const char *suf = "";
char pref = '%';
break;
}
- seq_printf(m, "%c%s:%s%s", pref, cell->name, volume->vlocation->vldb.name, suf);
+ seq_printf(m, "%c%s:%s%s", pref, cell->name, volume->name, suf);
return 0;
}
static int afs_test_super(struct super_block *sb, void *data)
{
struct afs_super_info *as1 = data;
- struct afs_super_info *as = sb->s_fs_info;
+ struct afs_super_info *as = AFS_FS_S(sb);
- return as->net == as1->net && as->volume == as1->volume;
+ return as->net == as1->net && as->volume->vid == as1->volume->vid;
}
static int afs_set_super(struct super_block *sb, void *data)
{
- sb->s_fs_info = data;
+ struct afs_super_info *as = data;
+
+ sb->s_fs_info = as;
return set_anon_super(sb, NULL);
}
static int afs_fill_super(struct super_block *sb,
struct afs_mount_params *params)
{
- struct afs_super_info *as = sb->s_fs_info;
+ struct afs_super_info *as = AFS_FS_S(sb);
struct afs_fid fid;
struct inode *inode = NULL;
int ret;
if (ret)
return ret;
sb->s_bdi->ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_SIZE;
- strlcpy(sb->s_id, as->volume->vlocation->vldb.name, sizeof(sb->s_id));
+ sprintf(sb->s_id, "%u", as->volume->vid);
+
+ afs_activate_volume(as->volume);
/* allocate the root inode and dentry */
fid.vid = as->volume->vid;
fid.vnode = 1;
fid.unique = 1;
- inode = afs_iget(sb, params->key, &fid, NULL, NULL);
+ inode = afs_iget(sb, params->key, &fid, NULL, NULL, NULL);
if (IS_ERR(inode))
return PTR_ERR(inode);
{
struct afs_mount_params params;
struct super_block *sb;
- struct afs_volume *vol;
+ struct afs_volume *candidate;
struct key *key;
struct afs_super_info *as;
int ret;
ret = -ENOMEM;
as = afs_alloc_sbi(¶ms);
if (!as)
- goto error;
+ goto error_key;
- /* parse the device name */
- vol = afs_volume_lookup(¶ms);
- if (IS_ERR(vol)) {
- ret = PTR_ERR(vol);
- goto error;
+ /* Assume we're going to need a volume record; at the very least we can
+ * use it to update the volume record if we have one already. This
+ * checks that the volume exists within the cell.
+ */
+ candidate = afs_create_volume(¶ms);
+ if (IS_ERR(candidate)) {
+ ret = PTR_ERR(candidate);
+ goto error_as;
}
- as->volume = vol;
+
+ as->volume = candidate;
/* allocate a deviceless superblock */
sb = sget(fs_type, afs_test_super, afs_set_super, flags, as);
error_sb:
deactivate_locked_super(sb);
+ goto error_key;
error_as:
afs_destroy_sbi(as);
+error_key:
+ key_put(params.key);
error:
afs_put_cell(params.net, params.cell);
- key_put(params.key);
_leave(" = %d", ret);
return ERR_PTR(ret);
}
/* Clear the callback interests (which will do ilookup5) before
* deactivating the superblock.
*/
- afs_clear_callback_interests(as->net, as->volume);
+ afs_clear_callback_interests(as->net, as->volume->servers);
kill_anon_super(sb);
+ afs_deactivate_volume(as->volume);
afs_destroy_sbi(as);
}
memset(vnode, 0, sizeof(*vnode));
inode_init_once(&vnode->vfs_inode);
- init_waitqueue_head(&vnode->update_waitq);
+ mutex_init(&vnode->io_lock);
mutex_init(&vnode->validate_lock);
spin_lock_init(&vnode->writeback_lock);
spin_lock_init(&vnode->lock);
memset(&vnode->status, 0, sizeof(vnode->status));
vnode->volume = NULL;
- vnode->update_cnt = 0;
vnode->flags = 1 << AFS_VNODE_UNSET;
_leave(" = %p", &vnode->vfs_inode);
*/
static int afs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
+ struct afs_fs_cursor fc;
struct afs_volume_status vs;
struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
struct key *key;
if (IS_ERR(key))
return PTR_ERR(key);
- ret = afs_vnode_get_volume_status(vnode, key, &vs);
- key_put(key);
- if (ret < 0) {
- _leave(" = %d", ret);
- return ret;
+ ret = -ERESTARTSYS;
+ if (afs_begin_vnode_operation(&fc, vnode, key)) {
+ fc.flags |= AFS_FS_CURSOR_NO_VSLEEP;
+ while (afs_select_fileserver(&fc)) {
+ fc.cb_break = vnode->cb_break + vnode->cb_s_break;
+ afs_fs_get_volume_status(&fc, &vs);
+ }
+
+ afs_check_for_remote_deletion(&fc, fc.vnode);
+ afs_vnode_commit_status(&fc, vnode, fc.cb_break);
+ ret = afs_end_vnode_operation(&fc);
}
- buf->f_type = dentry->d_sb->s_magic;
- buf->f_bsize = AFS_BLOCK_SIZE;
- buf->f_namelen = AFSNAMEMAX - 1;
+ key_put(key);
- if (vs.max_quota == 0)
- buf->f_blocks = vs.part_max_blocks;
- else
- buf->f_blocks = vs.max_quota;
- buf->f_bavail = buf->f_bfree = buf->f_blocks - vs.blocks_in_use;
- return 0;
+ if (ret == 0) {
+ buf->f_type = dentry->d_sb->s_magic;
+ buf->f_bsize = AFS_BLOCK_SIZE;
+ buf->f_namelen = AFSNAMEMAX - 1;
+
+ if (vs.max_quota == 0)
+ buf->f_blocks = vs.part_max_blocks;
+ else
+ buf->f_blocks = vs.max_quota;
+ buf->f_bavail = buf->f_bfree = buf->f_blocks - vs.blocks_in_use;
+ }
+
+ return ret;
}
#include "internal.h"
/*
- * deliver reply data to a VL.GetEntryByXXX call
+ * Deliver reply data to a VL.GetEntryByNameU call.
*/
-static int afs_deliver_vl_get_entry_by_xxx(struct afs_call *call)
+static int afs_deliver_vl_get_entry_by_name_u(struct afs_call *call)
{
- struct afs_cache_vlocation *entry;
- __be32 *bp;
+ struct afs_uvldbentry__xdr *uvldb;
+ struct afs_vldb_entry *entry;
+ bool new_only = false;
u32 tmp;
- int loop, ret;
+ int i, ret;
_enter("");
return ret;
/* unmarshall the reply once we've received all of it */
+ uvldb = call->buffer;
entry = call->reply[0];
- bp = call->buffer;
-
- for (loop = 0; loop < 64; loop++)
- entry->name[loop] = ntohl(*bp++);
- entry->name[loop] = 0;
- bp++; /* final NUL */
-
- bp++; /* type */
- entry->nservers = ntohl(*bp++);
-
- for (loop = 0; loop < 8; loop++) {
- entry->servers[loop].srx_family = AF_RXRPC;
- entry->servers[loop].srx_service = FS_SERVICE;
- entry->servers[loop].transport_type = SOCK_DGRAM;
- entry->servers[loop].transport_len = sizeof(entry->servers[loop].transport.sin6);
- entry->servers[loop].transport.sin6.sin6_family = AF_INET6;
- entry->servers[loop].transport.sin6.sin6_port = htons(AFS_FS_PORT);
- entry->servers[loop].transport.sin6.sin6_flowinfo = 0;
- entry->servers[loop].transport.sin6.sin6_scope_id = 0;
- entry->servers[loop].transport.sin6.sin6_addr.s6_addr32[0] = 0;
- entry->servers[loop].transport.sin6.sin6_addr.s6_addr32[1] = 0;
- entry->servers[loop].transport.sin6.sin6_addr.s6_addr32[2] = htonl(0xffff);
- entry->servers[loop].transport.sin6.sin6_addr.s6_addr32[3] = *bp++;
+
+ for (i = 0; i < ARRAY_SIZE(uvldb->name) - 1; i++)
+ entry->name[i] = (u8)ntohl(uvldb->name[i]);
+ entry->name[i] = 0;
+ entry->name_len = strlen(entry->name);
+
+ /* If there is a new replication site that we can use, ignore all the
+ * sites that aren't marked as new.
+ */
+ for (i = 0; i < AFS_NMAXNSERVERS; i++) {
+ tmp = ntohl(uvldb->serverFlags[i]);
+ if (!(tmp & AFS_VLSF_DONTUSE) &&
+ (tmp & AFS_VLSF_NEWREPSITE))
+ new_only = true;
}
- bp += 8; /* partition IDs */
+ for (i = 0; i < AFS_NMAXNSERVERS; i++) {
+ struct afs_uuid__xdr *xdr;
+ struct afs_uuid *uuid;
+ int j;
- for (loop = 0; loop < 8; loop++) {
- tmp = ntohl(*bp++);
- entry->srvtmask[loop] = 0;
+ tmp = ntohl(uvldb->serverFlags[i]);
+ if (tmp & AFS_VLSF_DONTUSE ||
+ (new_only && !(tmp & AFS_VLSF_NEWREPSITE)))
+ continue;
if (tmp & AFS_VLSF_RWVOL)
- entry->srvtmask[loop] |= AFS_VOL_VTM_RW;
+ entry->fs_mask[i] |= AFS_VOL_VTM_RW;
if (tmp & AFS_VLSF_ROVOL)
- entry->srvtmask[loop] |= AFS_VOL_VTM_RO;
+ entry->fs_mask[i] |= AFS_VOL_VTM_RO;
if (tmp & AFS_VLSF_BACKVOL)
- entry->srvtmask[loop] |= AFS_VOL_VTM_BAK;
- }
+ entry->fs_mask[i] |= AFS_VOL_VTM_BAK;
+ if (!entry->fs_mask[i])
+ continue;
+
+ xdr = &uvldb->serverNumber[i];
+ uuid = (struct afs_uuid *)&entry->fs_server[i];
+ uuid->time_low = xdr->time_low;
+ uuid->time_mid = htons(ntohl(xdr->time_mid));
+ uuid->time_hi_and_version = htons(ntohl(xdr->time_hi_and_version));
+ uuid->clock_seq_hi_and_reserved = (u8)ntohl(xdr->clock_seq_hi_and_reserved);
+ uuid->clock_seq_low = (u8)ntohl(xdr->clock_seq_low);
+ for (j = 0; j < 6; j++)
+ uuid->node[j] = (u8)ntohl(xdr->node[j]);
- entry->vid[0] = ntohl(*bp++);
- entry->vid[1] = ntohl(*bp++);
- entry->vid[2] = ntohl(*bp++);
+ entry->nr_servers++;
+ }
- bp++; /* clone ID */
+ for (i = 0; i < AFS_MAXTYPES; i++)
+ entry->vid[i] = ntohl(uvldb->volumeId[i]);
- tmp = ntohl(*bp++); /* flags */
- entry->vidmask = 0;
+ tmp = ntohl(uvldb->flags);
if (tmp & AFS_VLF_RWEXISTS)
- entry->vidmask |= AFS_VOL_VTM_RW;
+ __set_bit(AFS_VLDB_HAS_RW, &entry->flags);
if (tmp & AFS_VLF_ROEXISTS)
- entry->vidmask |= AFS_VOL_VTM_RO;
+ __set_bit(AFS_VLDB_HAS_RO, &entry->flags);
if (tmp & AFS_VLF_BACKEXISTS)
- entry->vidmask |= AFS_VOL_VTM_BAK;
- if (!entry->vidmask)
- return -EBADMSG;
+ __set_bit(AFS_VLDB_HAS_BAK, &entry->flags);
+ if (!(tmp & (AFS_VLF_RWEXISTS | AFS_VLF_ROEXISTS | AFS_VLF_BACKEXISTS))) {
+ entry->error = -ENOMEDIUM;
+ __set_bit(AFS_VLDB_QUERY_ERROR, &entry->flags);
+ }
+
+ __set_bit(AFS_VLDB_QUERY_VALID, &entry->flags);
_leave(" = 0 [done]");
return 0;
}
-/*
- * VL.GetEntryByName operation type
- */
-static const struct afs_call_type afs_RXVLGetEntryByName = {
- .name = "VL.GetEntryByName",
- .deliver = afs_deliver_vl_get_entry_by_xxx,
- .destructor = afs_flat_call_destructor,
-};
+static void afs_destroy_vl_get_entry_by_name_u(struct afs_call *call)
+{
+ kfree(call->reply[0]);
+ afs_flat_call_destructor(call);
+}
/*
- * VL.GetEntryById operation type
+ * VL.GetEntryByNameU operation type.
*/
-static const struct afs_call_type afs_RXVLGetEntryById = {
- .name = "VL.GetEntryById",
- .deliver = afs_deliver_vl_get_entry_by_xxx,
- .destructor = afs_flat_call_destructor,
+static const struct afs_call_type afs_RXVLGetEntryByNameU = {
+ .name = "VL.GetEntryByNameU",
+ .deliver = afs_deliver_vl_get_entry_by_name_u,
+ .destructor = afs_destroy_vl_get_entry_by_name_u,
};
/*
- * dispatch a get volume entry by name operation
+ * Dispatch a get volume entry by name or ID operation (uuid variant). If the
+ * volname is a decimal number then it's a volume ID not a volume name.
*/
-int afs_vl_get_entry_by_name(struct afs_net *net,
- struct afs_addr_cursor *ac,
- struct key *key,
- const char *volname,
- struct afs_cache_vlocation *entry,
- bool async)
+struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_net *net,
+ struct afs_addr_cursor *ac,
+ struct key *key,
+ const char *volname,
+ int volnamesz)
{
+ struct afs_vldb_entry *entry;
struct afs_call *call;
- size_t volnamesz, reqsz, padsz;
+ size_t reqsz, padsz;
__be32 *bp;
_enter("");
- volnamesz = strlen(volname);
padsz = (4 - (volnamesz & 3)) & 3;
reqsz = 8 + volnamesz + padsz;
- call = afs_alloc_flat_call(net, &afs_RXVLGetEntryByName, reqsz, 384);
- if (!call)
- return -ENOMEM;
+ entry = kzalloc(sizeof(struct afs_vldb_entry), GFP_KERNEL);
+ if (!entry)
+ return ERR_PTR(-ENOMEM);
+
+ call = afs_alloc_flat_call(net, &afs_RXVLGetEntryByNameU, reqsz,
+ sizeof(struct afs_uvldbentry__xdr));
+ if (!call) {
+ kfree(entry);
+ return ERR_PTR(-ENOMEM);
+ }
call->key = key;
call->reply[0] = entry;
+ call->ret_reply0 = true;
- /* marshall the parameters */
+ /* Marshall the parameters */
bp = call->request;
- *bp++ = htonl(VLGETENTRYBYNAME);
+ *bp++ = htonl(VLGETENTRYBYNAMEU);
*bp++ = htonl(volnamesz);
memcpy(bp, volname, volnamesz);
if (padsz > 0)
- memset((void *) bp + volnamesz, 0, padsz);
+ memset((void *)bp + volnamesz, 0, padsz);
- /* initiate the call */
- return afs_make_call(ac, call, GFP_KERNEL, async);
+ return (struct afs_vldb_entry *)afs_make_call(ac, call, GFP_KERNEL, false);
}
/*
- * dispatch a get volume entry by ID operation
+ * Deliver reply data to a VL.GetAddrsU call.
+ *
+ * GetAddrsU(IN ListAddrByAttributes *inaddr,
+ * OUT afsUUID *uuidp1,
+ * OUT uint32_t *uniquifier,
+ * OUT uint32_t *nentries,
+ * OUT bulkaddrs *blkaddrs);
*/
-int afs_vl_get_entry_by_id(struct afs_net *net,
- struct afs_addr_cursor *ac,
- struct key *key,
- afs_volid_t volid,
- afs_voltype_t voltype,
- struct afs_cache_vlocation *entry,
- bool async)
+static int afs_deliver_vl_get_addrs_u(struct afs_call *call)
{
+ struct afs_addr_list *alist;
+ __be32 *bp;
+ u32 uniquifier, nentries, count;
+ int i, ret;
+
+ _enter("{%u,%zu/%u}", call->unmarshall, call->offset, call->count);
+
+again:
+ switch (call->unmarshall) {
+ case 0:
+ call->offset = 0;
+ call->unmarshall++;
+
+ /* Extract the returned uuid, uniquifier, nentries and blkaddrs size */
+ case 1:
+ ret = afs_extract_data(call, call->buffer,
+ sizeof(struct afs_uuid__xdr) + 3 * sizeof(__be32),
+ true);
+ if (ret < 0)
+ return ret;
+
+ bp = call->buffer + sizeof(struct afs_uuid__xdr);
+ uniquifier = ntohl(*bp++);
+ nentries = ntohl(*bp++);
+ count = ntohl(*bp);
+
+ nentries = min(nentries, count);
+ alist = afs_alloc_addrlist(nentries, FS_SERVICE, AFS_FS_PORT);
+ if (!alist)
+ return -ENOMEM;
+ alist->version = uniquifier;
+ call->reply[0] = alist;
+ call->count = count;
+ call->count2 = nentries;
+ call->offset = 0;
+ call->unmarshall++;
+
+ /* Extract entries */
+ case 2:
+ count = min(call->count, 4U);
+ ret = afs_extract_data(call, call->buffer,
+ count * sizeof(__be32),
+ call->count > 4);
+ if (ret < 0)
+ return ret;
+
+ alist = call->reply[0];
+ bp = call->buffer;
+ for (i = 0; i < count; i++)
+ if (alist->nr_addrs < call->count2)
+ afs_merge_fs_addr4(alist, *bp++);
+
+ call->count -= count;
+ if (call->count > 0)
+ goto again;
+ call->offset = 0;
+ call->unmarshall++;
+ break;
+ }
+
+ _leave(" = 0 [done]");
+ return 0;
+}
+
+static void afs_vl_get_addrs_u_destructor(struct afs_call *call)
+{
+ afs_put_server(call->net, (struct afs_server *)call->reply[0]);
+ kfree(call->reply[1]);
+ return afs_flat_call_destructor(call);
+}
+
+/*
+ * VL.GetAddrsU operation type.
+ */
+static const struct afs_call_type afs_RXVLGetAddrsU = {
+ .name = "VL.GetAddrsU",
+ .deliver = afs_deliver_vl_get_addrs_u,
+ .destructor = afs_vl_get_addrs_u_destructor,
+};
+
+/*
+ * Dispatch an operation to get the addresses for a server, where the server is
+ * nominated by UUID.
+ */
+struct afs_addr_list *afs_vl_get_addrs_u(struct afs_net *net,
+ struct afs_addr_cursor *ac,
+ struct key *key,
+ const uuid_t *uuid)
+{
+ struct afs_ListAddrByAttributes__xdr *r;
+ const struct afs_uuid *u = (const struct afs_uuid *)uuid;
struct afs_call *call;
__be32 *bp;
+ int i;
_enter("");
- call = afs_alloc_flat_call(net, &afs_RXVLGetEntryById, 12, 384);
+ call = afs_alloc_flat_call(net, &afs_RXVLGetAddrsU,
+ sizeof(__be32) + sizeof(struct afs_ListAddrByAttributes__xdr),
+ sizeof(struct afs_uuid__xdr) + 3 * sizeof(__be32));
if (!call)
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
call->key = key;
- call->reply[0] = entry;
+ call->reply[0] = NULL;
+ call->ret_reply0 = true;
- /* marshall the parameters */
+ /* Marshall the parameters */
bp = call->request;
- *bp++ = htonl(VLGETENTRYBYID);
- *bp++ = htonl(volid);
- *bp = htonl(voltype);
+ *bp++ = htonl(VLGETADDRSU);
+ r = (struct afs_ListAddrByAttributes__xdr *)bp;
+ r->Mask = htonl(AFS_VLADDR_UUID);
+ r->ipaddr = 0;
+ r->index = 0;
+ r->spare = 0;
+ r->uuid.time_low = u->time_low;
+ r->uuid.time_mid = htonl(ntohs(u->time_mid));
+ r->uuid.time_hi_and_version = htonl(ntohs(u->time_hi_and_version));
+ r->uuid.clock_seq_hi_and_reserved = htonl(u->clock_seq_hi_and_reserved);
+ r->uuid.clock_seq_low = htonl(u->clock_seq_low);
+ for (i = 0; i < 6; i++)
+ r->uuid.node[i] = ntohl(u->node[i]);
- /* initiate the call */
- return afs_make_call(ac, call, GFP_KERNEL, async);
+ return (struct afs_addr_list *)afs_make_call(ac, call, GFP_KERNEL, false);
}
+++ /dev/null
-/* AFS volume location management
- *
- * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/sched.h>
-#include "internal.h"
-
-struct workqueue_struct *afs_vlocation_update_worker;
-
-static unsigned afs_vlocation_timeout = 10; /* volume location timeout in seconds */
-static unsigned afs_vlocation_update_timeout = 10 * 60;
-
-/*
- * iterate through the VL servers in a cell until one of them admits knowing
- * about the volume in question
- */
-static int afs_vlocation_access_vl_by_name(struct afs_vlocation *vl,
- struct key *key,
- struct afs_cache_vlocation *vldb)
-{
- struct afs_addr_cursor ac;
- int ret;
-
- _enter("%s,%s", vl->cell->name, vl->vldb.name);
-
- ret = afs_set_vl_cursor(&ac, vl->cell);
- if (ret < 0)
- return ret;
-
- down_write(&vl->cell->vl_sem);
-
- ret = -ENOMEDIUM;
- while (afs_iterate_addresses(&ac)) {
- _debug("CellServ[%hu]: %pIS", ac.index, &ac.addr->transport);
-
- /* attempt to access the VL server */
- ac.error = afs_vl_get_entry_by_name(vl->cell->net, &ac, key,
- vl->vldb.name, vldb, false);
- switch (ac.error) {
- case 0:
- goto out;
- case -ENOMEM:
- case -ENONET:
- case -ENETUNREACH:
- case -EHOSTUNREACH:
- case -ECONNREFUSED:
- if (ac.error == -ENOMEM || ac.error == -ENONET)
- goto out;
- break;
- case -ENOMEDIUM:
- case -EKEYREJECTED:
- case -EKEYEXPIRED:
- ac.responded = true;
- goto out;
- default:
- ac.responded = true;
- ac.error = -EIO;
- break;
- }
- }
-
-out:
- up_write(&vl->cell->vl_sem);
- ret = afs_end_cursor(&ac);
- _leave(" = %d", ret);
- return ret;
-}
-
-/*
- * iterate through the VL servers in a cell until one of them admits knowing
- * about the volume in question
- */
-static int afs_vlocation_access_vl_by_id(struct afs_vlocation *vl,
- struct key *key,
- afs_volid_t volid,
- afs_voltype_t voltype,
- struct afs_cache_vlocation *vldb)
-{
- struct afs_addr_cursor ac;
- int ret;
-
- _enter("%s,%x,%d,", vl->cell->name, volid, voltype);
-
- ret = afs_set_vl_cursor(&ac, vl->cell);
- if (ret < 0)
- return ret;
-
- down_write(&vl->cell->vl_sem);
- ret = -ENOMEDIUM;
- while (afs_iterate_addresses(&ac)) {
- _debug("CellServ[%hu]: %pIS", ac.index, &ac.addr->transport);
-
- /* attempt to access the VL server */
- ac.error = afs_vl_get_entry_by_id(vl->cell->net, &ac, key, volid,
- voltype, vldb, false);
- switch (ac.error) {
- case 0:
- goto out;
- case -ENOMEM:
- case -ENONET:
- case -ENETUNREACH:
- case -EHOSTUNREACH:
- case -ECONNREFUSED:
- if (ac.error == -ENOMEM || ac.error == -ENONET)
- goto out;
- goto rotate;
- case -EBUSY:
- ac.responded = true;
- vl->upd_busy_cnt++;
- if (vl->upd_busy_cnt <= 3) {
- if (vl->upd_busy_cnt > 1) {
- /* second+ BUSY - sleep a little bit */
- set_current_state(TASK_UNINTERRUPTIBLE);
- schedule_timeout(1);
- }
- continue;
- }
- break;
- case -ENOMEDIUM:
- ac.responded = true;
- vl->upd_rej_cnt++;
- goto rotate;
- default:
- ac.responded = true;
- ac.error = -EIO;
- goto rotate;
- }
-
- /* rotate the server records upon lookup failure */
- rotate:
- vl->upd_busy_cnt = 0;
- }
-
-out:
- if (ac.error < 0 && vl->upd_rej_cnt > 0) {
- printk(KERN_NOTICE "kAFS:"
- " Active volume no longer valid '%s'\n",
- vl->vldb.name);
- vl->valid = 0;
- ac.error = -ENOMEDIUM;
- }
-
- up_write(&vl->cell->vl_sem);
- ret = afs_end_cursor(&ac);
- _leave(" = %d", ret);
- return ret;
-}
-
-/*
- * allocate a volume location record
- */
-static struct afs_vlocation *afs_vlocation_alloc(struct afs_cell *cell,
- const char *name,
- size_t namesz)
-{
- struct afs_vlocation *vl;
-
- vl = kzalloc(sizeof(struct afs_vlocation), GFP_KERNEL);
- if (vl) {
- vl->cell = cell;
- vl->state = AFS_VL_NEW;
- atomic_set(&vl->usage, 1);
- INIT_LIST_HEAD(&vl->link);
- INIT_LIST_HEAD(&vl->grave);
- INIT_LIST_HEAD(&vl->update);
- init_waitqueue_head(&vl->waitq);
- spin_lock_init(&vl->lock);
- memcpy(vl->vldb.name, name, namesz);
- }
-
- _leave(" = %p", vl);
- return vl;
-}
-
-/*
- * update record if we found it in the cache
- */
-static int afs_vlocation_update_record(struct afs_vlocation *vl,
- struct key *key,
- struct afs_cache_vlocation *vldb)
-{
- afs_voltype_t voltype;
- afs_volid_t vid;
- int ret;
-
- /* try to look up a cached volume in the cell VL databases by ID */
- _debug("Locally Cached: %s %02x", vl->vldb.name, vl->vldb.vidmask);
-
- _debug("Vids: %08x %08x %08x",
- vl->vldb.vid[0],
- vl->vldb.vid[1],
- vl->vldb.vid[2]);
-
- if (vl->vldb.vidmask & AFS_VOL_VTM_RW) {
- vid = vl->vldb.vid[0];
- voltype = AFSVL_RWVOL;
- } else if (vl->vldb.vidmask & AFS_VOL_VTM_RO) {
- vid = vl->vldb.vid[1];
- voltype = AFSVL_ROVOL;
- } else if (vl->vldb.vidmask & AFS_VOL_VTM_BAK) {
- vid = vl->vldb.vid[2];
- voltype = AFSVL_BACKVOL;
- } else {
- BUG();
- vid = 0;
- voltype = 0;
- }
-
- /* contact the server to make sure the volume is still available
- * - TODO: need to handle disconnected operation here
- */
- ret = afs_vlocation_access_vl_by_id(vl, key, vid, voltype, vldb);
- switch (ret) {
- /* net error */
- default:
- printk(KERN_WARNING "kAFS:"
- " failed to update volume '%s' (%x) up in '%s': %d\n",
- vl->vldb.name, vid, vl->cell->name, ret);
- _leave(" = %d", ret);
- return ret;
-
- /* pulled from local cache into memory */
- case 0:
- _leave(" = 0");
- return 0;
-
- /* uh oh... looks like the volume got deleted */
- case -ENOMEDIUM:
- printk(KERN_ERR "kAFS:"
- " volume '%s' (%x) does not exist '%s'\n",
- vl->vldb.name, vid, vl->cell->name);
-
- /* TODO: make existing record unavailable */
- _leave(" = %d", ret);
- return ret;
- }
-}
-
-/*
- * apply the update to a VL record
- */
-static void afs_vlocation_apply_update(struct afs_vlocation *vl,
- struct afs_cache_vlocation *vldb)
-{
- _debug("Done VL Lookup: %s %02x", vldb->name, vldb->vidmask);
-
- _debug("Vids: %08x %08x %08x",
- vldb->vid[0], vldb->vid[1], vldb->vid[2]);
-
- if (strcmp(vldb->name, vl->vldb.name) != 0)
- printk(KERN_NOTICE "kAFS:"
- " name of volume '%s' changed to '%s' on server\n",
- vl->vldb.name, vldb->name);
-
- vl->vldb = *vldb;
-}
-
-/*
- * fill in a volume location record, consulting the cache and the VL server
- * both
- */
-static int afs_vlocation_fill_in_record(struct afs_vlocation *vl,
- struct key *key)
-{
- struct afs_cache_vlocation vldb;
- int ret;
-
- _enter("");
-
- ASSERTCMP(vl->valid, ==, 0);
-
- memset(&vldb, 0, sizeof(vldb));
-
- /* Try to look up an unknown volume in the cell VL databases by name */
- ret = afs_vlocation_access_vl_by_name(vl, key, &vldb);
- if (ret < 0) {
- printk("kAFS: failed to locate '%s' in cell '%s'\n",
- vl->vldb.name, vl->cell->name);
- return ret;
- }
-
- afs_vlocation_apply_update(vl, &vldb);
- _leave(" = 0");
- return 0;
-}
-
-/*
- * queue a vlocation record for updates
- */
-static void afs_vlocation_queue_for_updates(struct afs_net *net,
- struct afs_vlocation *vl)
-{
- struct afs_vlocation *xvl;
-
- /* wait at least 10 minutes before updating... */
- vl->update_at = ktime_get_real_seconds() +
- afs_vlocation_update_timeout;
-
- spin_lock(&net->vl_updates_lock);
-
- if (!list_empty(&net->vl_updates)) {
- /* ... but wait at least 1 second more than the newest record
- * already queued so that we don't spam the VL server suddenly
- * with lots of requests
- */
- xvl = list_entry(net->vl_updates.prev,
- struct afs_vlocation, update);
- if (vl->update_at <= xvl->update_at)
- vl->update_at = xvl->update_at + 1;
- } else if (net->live) {
- queue_delayed_work(afs_vlocation_update_worker,
- &net->vl_updater,
- afs_vlocation_update_timeout * HZ);
- }
-
- list_add_tail(&vl->update, &net->vl_updates);
- spin_unlock(&net->vl_updates_lock);
-}
-
-/*
- * lookup volume location
- * - iterate through the VL servers in a cell until one of them admits knowing
- * about the volume in question
- * - lookup in the local cache if not able to find on the VL server
- * - insert/update in the local cache if did get a VL response
- */
-struct afs_vlocation *afs_vlocation_lookup(struct afs_net *net,
- struct afs_cell *cell,
- struct key *key,
- const char *name,
- size_t namesz)
-{
- struct afs_vlocation *vl;
- int ret;
-
- _enter("{%s},{%x},%*.*s,%zu",
- cell->name, key_serial(key),
- (int) namesz, (int) namesz, name, namesz);
-
- if (namesz >= sizeof(vl->vldb.name)) {
- _leave(" = -ENAMETOOLONG");
- return ERR_PTR(-ENAMETOOLONG);
- }
-
- /* see if we have an in-memory copy first */
- down_write(&cell->vl_sem);
- spin_lock(&cell->vl_lock);
- list_for_each_entry(vl, &cell->vl_list, link) {
- if (vl->vldb.name[namesz] != '\0')
- continue;
- if (memcmp(vl->vldb.name, name, namesz) == 0)
- goto found_in_memory;
- }
- spin_unlock(&cell->vl_lock);
-
- /* not in the cell's in-memory lists - create a new record */
- vl = afs_vlocation_alloc(cell, name, namesz);
- if (!vl) {
- up_write(&cell->vl_sem);
- return ERR_PTR(-ENOMEM);
- }
-
- afs_get_cell(cell);
-
- list_add_tail(&vl->link, &cell->vl_list);
- vl->state = AFS_VL_CREATING;
- up_write(&cell->vl_sem);
-
-fill_in_record:
- ret = afs_vlocation_fill_in_record(vl, key);
- if (ret < 0)
- goto error_abandon;
- spin_lock(&vl->lock);
- vl->state = AFS_VL_VALID;
- spin_unlock(&vl->lock);
- wake_up(&vl->waitq);
-
- /* schedule for regular updates */
- afs_vlocation_queue_for_updates(net, vl);
- goto success;
-
-found_in_memory:
- /* found in memory */
- _debug("found in memory");
- atomic_inc(&vl->usage);
- spin_unlock(&cell->vl_lock);
- if (!list_empty(&vl->grave)) {
- spin_lock(&net->vl_graveyard_lock);
- list_del_init(&vl->grave);
- spin_unlock(&net->vl_graveyard_lock);
- }
- up_write(&cell->vl_sem);
-
- /* see if it was an abandoned record that we might try filling in */
- spin_lock(&vl->lock);
- while (vl->state != AFS_VL_VALID) {
- afs_vlocation_state_t state = vl->state;
-
- _debug("invalid [state %d]", state);
-
- if (state == AFS_VL_NEW || state == AFS_VL_NO_VOLUME) {
- vl->state = AFS_VL_CREATING;
- spin_unlock(&vl->lock);
- goto fill_in_record;
- }
-
- /* must now wait for creation or update by someone else to
- * complete */
- _debug("wait");
-
- spin_unlock(&vl->lock);
- ret = wait_event_interruptible(vl->waitq,
- vl->state == AFS_VL_NEW ||
- vl->state == AFS_VL_VALID ||
- vl->state == AFS_VL_NO_VOLUME);
- if (ret < 0)
- goto error;
- spin_lock(&vl->lock);
- }
- spin_unlock(&vl->lock);
-
-success:
- _leave(" = %p", vl);
- return vl;
-
-error_abandon:
- spin_lock(&vl->lock);
- vl->state = AFS_VL_NEW;
- spin_unlock(&vl->lock);
- wake_up(&vl->waitq);
-error:
- ASSERT(vl != NULL);
- afs_put_vlocation(net, vl);
- _leave(" = %d", ret);
- return ERR_PTR(ret);
-}
-
-/*
- * finish using a volume location record
- */
-void afs_put_vlocation(struct afs_net *net, struct afs_vlocation *vl)
-{
- if (!vl)
- return;
-
- _enter("%s", vl->vldb.name);
-
- ASSERTCMP(atomic_read(&vl->usage), >, 0);
-
- if (likely(!atomic_dec_and_test(&vl->usage))) {
- _leave("");
- return;
- }
-
- spin_lock(&net->vl_graveyard_lock);
- if (atomic_read(&vl->usage) == 0) {
- _debug("buried");
- list_move_tail(&vl->grave, &net->vl_graveyard);
- vl->time_of_death = ktime_get_real_seconds();
- queue_delayed_work(afs_wq, &net->vl_reaper,
- afs_vlocation_timeout * HZ);
-
- /* suspend updates on this record */
- if (!list_empty(&vl->update)) {
- spin_lock(&net->vl_updates_lock);
- list_del_init(&vl->update);
- spin_unlock(&net->vl_updates_lock);
- }
- }
- spin_unlock(&net->vl_graveyard_lock);
- _leave(" [killed?]");
-}
-
-/*
- * destroy a dead volume location record
- */
-static void afs_vlocation_destroy(struct afs_net *net, struct afs_vlocation *vl)
-{
- _enter("%p", vl);
-
- afs_put_cell(net, vl->cell);
- kfree(vl);
-}
-
-/*
- * reap dead volume location records
- */
-void afs_vlocation_reaper(struct work_struct *work)
-{
- LIST_HEAD(corpses);
- struct afs_vlocation *vl;
- struct afs_net *net = container_of(work, struct afs_net, vl_reaper.work);
- unsigned long delay, expiry;
- time64_t now;
-
- _enter("");
-
- now = ktime_get_real_seconds();
- spin_lock(&net->vl_graveyard_lock);
-
- while (!list_empty(&net->vl_graveyard)) {
- vl = list_entry(net->vl_graveyard.next,
- struct afs_vlocation, grave);
-
- _debug("check %p", vl);
-
- /* the queue is ordered most dead first */
- if (net->live) {
- expiry = vl->time_of_death + afs_vlocation_timeout;
- if (expiry > now) {
- delay = (expiry - now) * HZ;
- _debug("delay %lu", delay);
- mod_delayed_work(afs_wq, &net->vl_reaper, delay);
- break;
- }
- }
-
- spin_lock(&vl->cell->vl_lock);
- if (atomic_read(&vl->usage) > 0) {
- _debug("no reap");
- list_del_init(&vl->grave);
- } else {
- _debug("reap");
- list_move_tail(&vl->grave, &corpses);
- list_del_init(&vl->link);
- }
- spin_unlock(&vl->cell->vl_lock);
- }
-
- spin_unlock(&net->vl_graveyard_lock);
-
- /* now reap the corpses we've extracted */
- while (!list_empty(&corpses)) {
- vl = list_entry(corpses.next, struct afs_vlocation, grave);
- list_del(&vl->grave);
- afs_vlocation_destroy(net, vl);
- }
-
- _leave("");
-}
-
-/*
- * discard all the volume location records for rmmod
- */
-void __net_exit afs_vlocation_purge(struct afs_net *net)
-{
- spin_lock(&net->vl_updates_lock);
- list_del_init(&net->vl_updates);
- spin_unlock(&net->vl_updates_lock);
- mod_delayed_work(afs_vlocation_update_worker, &net->vl_updater, 0);
- mod_delayed_work(afs_wq, &net->vl_reaper, 0);
-}
-
-/*
- * update a volume location
- */
-void afs_vlocation_updater(struct work_struct *work)
-{
- struct afs_cache_vlocation vldb;
- struct afs_vlocation *vl, *xvl;
- struct afs_net *net = container_of(work, struct afs_net, vl_updater.work);
- time64_t now;
- long timeout;
- int ret;
-
- if (!net->live)
- return;
-
- _enter("");
-
- now = ktime_get_real_seconds();
-
- /* find a record to update */
- spin_lock(&net->vl_updates_lock);
- for (;;) {
- if (list_empty(&net->vl_updates) || !net->live) {
- spin_unlock(&net->vl_updates_lock);
- _leave(" [nothing]");
- return;
- }
-
- vl = list_entry(net->vl_updates.next,
- struct afs_vlocation, update);
- if (atomic_read(&vl->usage) > 0)
- break;
- list_del_init(&vl->update);
- }
-
- timeout = vl->update_at - now;
- if (timeout > 0) {
- queue_delayed_work(afs_vlocation_update_worker,
- &net->vl_updater, timeout * HZ);
- spin_unlock(&net->vl_updates_lock);
- _leave(" [nothing]");
- return;
- }
-
- list_del_init(&vl->update);
- atomic_inc(&vl->usage);
- spin_unlock(&net->vl_updates_lock);
-
- /* we can now perform the update */
- _debug("update %s", vl->vldb.name);
- vl->state = AFS_VL_UPDATING;
- vl->upd_rej_cnt = 0;
- vl->upd_busy_cnt = 0;
-
- ret = afs_vlocation_update_record(vl, NULL, &vldb);
- spin_lock(&vl->lock);
- switch (ret) {
- case 0:
- afs_vlocation_apply_update(vl, &vldb);
- vl->state = AFS_VL_VALID;
- break;
- case -ENOMEDIUM:
- vl->state = AFS_VL_VOLUME_DELETED;
- break;
- default:
- vl->state = AFS_VL_UNCERTAIN;
- break;
- }
- spin_unlock(&vl->lock);
- wake_up(&vl->waitq);
-
- /* and then reschedule */
- _debug("reschedule");
- vl->update_at = ktime_get_real_seconds() +
- afs_vlocation_update_timeout;
-
- spin_lock(&net->vl_updates_lock);
-
- if (!list_empty(&net->vl_updates)) {
- /* next update in 10 minutes, but wait at least 1 second more
- * than the newest record already queued so that we don't spam
- * the VL server suddenly with lots of requests
- */
- xvl = list_entry(net->vl_updates.prev,
- struct afs_vlocation, update);
- if (vl->update_at <= xvl->update_at)
- vl->update_at = xvl->update_at + 1;
- xvl = list_entry(net->vl_updates.next,
- struct afs_vlocation, update);
- timeout = xvl->update_at - now;
- if (timeout < 0)
- timeout = 0;
- } else {
- timeout = afs_vlocation_update_timeout;
- }
-
- ASSERT(list_empty(&vl->update));
-
- list_add_tail(&vl->update, &net->vl_updates);
-
- _debug("timeout %ld", timeout);
- queue_delayed_work(afs_vlocation_update_worker, &net->vl_updater, timeout * HZ);
- spin_unlock(&net->vl_updates_lock);
- afs_put_vlocation(net, vl);
-}
+++ /dev/null
-/* AFS vnode management
- *
- * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/fs.h>
-#include <linux/sched.h>
-#include "internal.h"
-
-/*
- * Handle remote file deletion.
- */
-static void afs_vnode_deleted_remotely(struct afs_vnode *vnode)
-{
- struct afs_cb_interest *cbi = vnode->cb_interest;
-
- _enter("{%p}", cbi);
-
- set_bit(AFS_VNODE_DELETED, &vnode->flags);
-
- if (cbi) {
- vnode->cb_interest = NULL;
- afs_put_cb_interest(afs_v2net(vnode), cbi);
- }
-
- _leave("");
-}
-
-/*
- * finish off updating the recorded status of a file after a successful
- * operation completion
- * - starts callback expiry timer
- * - adds to server's callback list
- */
-void afs_vnode_finalise_status_update(struct afs_vnode *vnode,
- struct afs_server *server)
-{
- spin_lock(&vnode->lock);
- vnode->update_cnt--;
- ASSERTCMP(vnode->update_cnt, >=, 0);
- spin_unlock(&vnode->lock);
-
- wake_up_all(&vnode->update_waitq);
- _leave("");
-}
-
-/*
- * finish off updating the recorded status of a file after an operation failed
- */
-static void afs_vnode_status_update_failed(struct afs_fs_cursor *fc,
- struct afs_vnode *vnode)
-{
- _enter("{%x:%u},%d", vnode->fid.vid, vnode->fid.vnode, fc->ac.error);
-
- spin_lock(&vnode->lock);
-
- if (fc->ac.error == -ENOENT) {
- /* the file was deleted on the server */
- _debug("got NOENT from server - marking file deleted");
- afs_vnode_deleted_remotely(vnode);
- }
-
- vnode->update_cnt--;
- ASSERTCMP(vnode->update_cnt, >=, 0);
- spin_unlock(&vnode->lock);
-
- wake_up_all(&vnode->update_waitq);
- _leave("");
-}
-
-/*
- * fetch file status from the volume
- * - don't issue a fetch if:
- * - the changed bit is not set and there's a valid callback
- * - there are any outstanding ops that will fetch the status
- * - TODO implement local caching
- */
-int afs_vnode_fetch_status(struct afs_vnode *vnode, struct key *key, bool force)
-{
- struct afs_fs_cursor fc;
- unsigned int cb_break = 0;
-
- DECLARE_WAITQUEUE(myself, current);
-
- _enter("%s,{%x:%u.%u,S=%lx},%u",
- vnode->volume->vlocation->vldb.name,
- vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
- vnode->flags,
- force);
-
- if (!force && test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
- _leave(" [unchanged]");
- return 0;
- }
-
- if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
- _leave(" [deleted]");
- return -ENOENT;
- }
-
- cb_break = vnode->cb_break + vnode->cb_s_break;
-
- spin_lock(&vnode->lock);
-
- if (!force && test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
- spin_unlock(&vnode->lock);
- _leave(" [unchanged]");
- return 0;
- }
-
- ASSERTCMP(vnode->update_cnt, >=, 0);
-
- if (vnode->update_cnt > 0) {
- /* someone else started a fetch */
- _debug("wait on fetch %d", vnode->update_cnt);
-
- set_current_state(TASK_UNINTERRUPTIBLE);
- ASSERT(myself.func != NULL);
- add_wait_queue(&vnode->update_waitq, &myself);
-
- /* wait for the status to be updated */
- for (;;) {
- if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags))
- break;
- if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
- break;
-
- /* check to see if it got updated and invalidated all
- * before we saw it */
- if (vnode->update_cnt == 0) {
- remove_wait_queue(&vnode->update_waitq,
- &myself);
- set_current_state(TASK_RUNNING);
- goto get_anyway;
- }
-
- spin_unlock(&vnode->lock);
-
- schedule();
- set_current_state(TASK_UNINTERRUPTIBLE);
-
- spin_lock(&vnode->lock);
- }
-
- remove_wait_queue(&vnode->update_waitq, &myself);
- spin_unlock(&vnode->lock);
- set_current_state(TASK_RUNNING);
-
- return test_bit(AFS_VNODE_DELETED, &vnode->flags) ?
- -ENOENT : 0;
- }
-
-get_anyway:
- /* okay... we're going to have to initiate the op */
- vnode->update_cnt++;
-
- spin_unlock(&vnode->lock);
-
- /* merge AFS status fetches and clear outstanding callback on this
- * vnode */
- afs_init_fs_cursor(&fc, vnode);
- do {
- /* pick a server to query */
- if (!afs_volume_pick_fileserver(&fc, vnode))
- goto no_server;
-
- fc.ac.error = afs_fs_fetch_file_status(&fc, key, vnode, NULL, false);
-
- } while (afs_iterate_fs_cursor(&fc, vnode));
-
- /* adjust the flags */
- if (fc.ac.error == 0) {
- _debug("adjust");
- afs_cache_permit(vnode, key, cb_break);
- afs_vnode_finalise_status_update(vnode, fc.server);
- } else {
- _debug("failed [%d]", fc.ac.error);
- afs_vnode_status_update_failed(&fc, vnode);
- }
-
-out:
- afs_end_fs_cursor(&fc, afs_v2net(vnode));
- ASSERTCMP(vnode->update_cnt, >=, 0);
- _leave(" = %d [cnt %d]", fc.ac.error, vnode->update_cnt);
- return fc.ac.error;
-
-no_server:
- spin_lock(&vnode->lock);
- vnode->update_cnt--;
- spin_unlock(&vnode->lock);
- goto out;
-}
-
-/*
- * fetch file data from the volume
- * - TODO implement caching
- */
-int afs_vnode_fetch_data(struct afs_vnode *vnode, struct key *key,
- struct afs_read *desc)
-{
- struct afs_fs_cursor fc;
-
- _enter("%s{%x:%u.%u},%x,,,",
- vnode->volume->vlocation->vldb.name,
- vnode->fid.vid,
- vnode->fid.vnode,
- vnode->fid.unique,
- key_serial(key));
-
- /* this op will fetch the status */
- spin_lock(&vnode->lock);
- vnode->update_cnt++;
- spin_unlock(&vnode->lock);
-
- /* merge in AFS status fetches and clear outstanding callback on this
- * vnode */
- afs_init_fs_cursor(&fc, vnode);
- do {
- /* pick a server to query */
- if (!afs_volume_pick_fileserver(&fc, vnode))
- goto no_server;
-
- fc.ac.error = afs_fs_fetch_data(&fc, key, vnode, desc, false);
-
- } while (afs_iterate_fs_cursor(&fc, vnode));
-
- /* adjust the flags */
- if (fc.ac.error == 0)
- afs_vnode_finalise_status_update(vnode, fc.server);
- else
- afs_vnode_status_update_failed(&fc, vnode);
-
-out:
- return afs_end_fs_cursor(&fc, afs_v2net(vnode));
-
-no_server:
- spin_lock(&vnode->lock);
- vnode->update_cnt--;
- ASSERTCMP(vnode->update_cnt, >=, 0);
- spin_unlock(&vnode->lock);
- goto out;
-}
-
-/*
- * make a file or a directory
- */
-int afs_vnode_create(struct afs_vnode *vnode, struct key *key,
- const char *name, umode_t mode, struct afs_fid *newfid,
- struct afs_file_status *newstatus,
- struct afs_callback *newcb, struct afs_server **_server)
-{
- struct afs_fs_cursor fc;
-
- _enter("%s{%x:%u.%u},%x,%s,,",
- vnode->volume->vlocation->vldb.name,
- vnode->fid.vid,
- vnode->fid.vnode,
- vnode->fid.unique,
- key_serial(key),
- name);
-
- /* this op will fetch the status on the directory we're creating in */
- spin_lock(&vnode->lock);
- vnode->update_cnt++;
- spin_unlock(&vnode->lock);
-
- afs_init_fs_cursor(&fc, vnode);
- do {
- /* pick a server to query */
- if (!afs_volume_pick_fileserver(&fc, vnode))
- goto no_server;
-
- fc.ac.error = afs_fs_create(&fc, key, vnode, name, mode, newfid,
- newstatus, newcb, false);
-
- } while (afs_iterate_fs_cursor(&fc, vnode));
-
- /* adjust the flags */
- if (fc.ac.error == 0) {
- afs_vnode_finalise_status_update(vnode, fc.server);
- *_server = fc.server;
- fc.server = NULL;
- } else {
- afs_vnode_status_update_failed(&fc, vnode);
- *_server = NULL;
- }
-
-out:
- return afs_end_fs_cursor(&fc, afs_v2net(vnode));
-
-no_server:
- spin_lock(&vnode->lock);
- vnode->update_cnt--;
- ASSERTCMP(vnode->update_cnt, >=, 0);
- spin_unlock(&vnode->lock);
- goto out;
-}
-
-/*
- * remove a file or directory
- */
-int afs_vnode_remove(struct afs_vnode *vnode, struct key *key, const char *name,
- bool isdir)
-{
- struct afs_fs_cursor fc;
-
- _enter("%s{%x:%u.%u},%x,%s",
- vnode->volume->vlocation->vldb.name,
- vnode->fid.vid,
- vnode->fid.vnode,
- vnode->fid.unique,
- key_serial(key),
- name);
-
- /* this op will fetch the status on the directory we're removing from */
- spin_lock(&vnode->lock);
- vnode->update_cnt++;
- spin_unlock(&vnode->lock);
-
- afs_init_fs_cursor(&fc, vnode);
- do {
- /* pick a server to query */
- if (!afs_volume_pick_fileserver(&fc, vnode))
- goto no_server;
-
- fc.ac.error = afs_fs_remove(&fc, key, vnode, name, isdir, false);
-
- } while (afs_iterate_fs_cursor(&fc, vnode));
-
- /* adjust the flags */
- if (fc.ac.error == 0)
- afs_vnode_finalise_status_update(vnode, fc.server);
- else
- afs_vnode_status_update_failed(&fc, vnode);
-
-out:
- return afs_end_fs_cursor(&fc, afs_v2net(vnode));
-
-no_server:
- spin_lock(&vnode->lock);
- vnode->update_cnt--;
- ASSERTCMP(vnode->update_cnt, >=, 0);
- spin_unlock(&vnode->lock);
- goto out;
-}
-
-/*
- * create a hard link
- */
-int afs_vnode_link(struct afs_vnode *dvnode, struct afs_vnode *vnode,
- struct key *key, const char *name)
-{
- struct afs_fs_cursor fc;
-
- _enter("%s{%x:%u.%u},%s{%x:%u.%u},%x,%s",
- dvnode->volume->vlocation->vldb.name,
- dvnode->fid.vid,
- dvnode->fid.vnode,
- dvnode->fid.unique,
- vnode->volume->vlocation->vldb.name,
- vnode->fid.vid,
- vnode->fid.vnode,
- vnode->fid.unique,
- key_serial(key),
- name);
-
- /* this op will fetch the status on the directory we're removing from */
- spin_lock(&vnode->lock);
- vnode->update_cnt++;
- spin_unlock(&vnode->lock);
- spin_lock(&dvnode->lock);
- dvnode->update_cnt++;
- spin_unlock(&dvnode->lock);
-
- afs_init_fs_cursor(&fc, vnode);
- do {
- /* pick a server to query */
- if (!afs_volume_pick_fileserver(&fc, dvnode))
- goto no_server;
-
- fc.ac.error = afs_fs_link(&fc, key, dvnode, vnode, name, false);
-
- } while (afs_iterate_fs_cursor(&fc, dvnode));
-
- /* adjust the flags */
- if (fc.ac.error == 0) {
- afs_vnode_finalise_status_update(vnode, fc.server);
- afs_vnode_finalise_status_update(dvnode, fc.server);
- } else {
- afs_vnode_status_update_failed(&fc, vnode);
- afs_vnode_status_update_failed(&fc, dvnode);
- }
-
-out:
- return afs_end_fs_cursor(&fc, afs_v2net(vnode));
-
-no_server:
- spin_lock(&vnode->lock);
- vnode->update_cnt--;
- ASSERTCMP(vnode->update_cnt, >=, 0);
- spin_unlock(&vnode->lock);
- spin_lock(&dvnode->lock);
- dvnode->update_cnt--;
- ASSERTCMP(dvnode->update_cnt, >=, 0);
- spin_unlock(&dvnode->lock);
- goto out;
-}
-
-/*
- * create a symbolic link
- */
-int afs_vnode_symlink(struct afs_vnode *vnode, struct key *key,
- const char *name, const char *content,
- struct afs_fid *newfid,
- struct afs_file_status *newstatus,
- struct afs_server **_server)
-{
- struct afs_fs_cursor fc;
-
- _enter("%s{%x:%u.%u},%x,%s,%s,,,",
- vnode->volume->vlocation->vldb.name,
- vnode->fid.vid,
- vnode->fid.vnode,
- vnode->fid.unique,
- key_serial(key),
- name, content);
-
- /* this op will fetch the status on the directory we're creating in */
- spin_lock(&vnode->lock);
- vnode->update_cnt++;
- spin_unlock(&vnode->lock);
-
- afs_init_fs_cursor(&fc, vnode);
- do {
- /* pick a server to query */
- if (!afs_volume_pick_fileserver(&fc, vnode))
- goto no_server;
-
- fc.ac.error = afs_fs_symlink(&fc, key, vnode, name, content,
- newfid, newstatus, false);
-
- } while (afs_iterate_fs_cursor(&fc, vnode));
-
- /* adjust the flags */
- if (fc.ac.error == 0) {
- afs_vnode_finalise_status_update(vnode, fc.server);
- *_server = fc.server;
- fc.server = NULL;
- } else {
- afs_vnode_status_update_failed(&fc, vnode);
- *_server = NULL;
- }
-
-out:
- return afs_end_fs_cursor(&fc, afs_v2net(vnode));
-
-no_server:
- spin_lock(&vnode->lock);
- vnode->update_cnt--;
- ASSERTCMP(vnode->update_cnt, >=, 0);
- spin_unlock(&vnode->lock);
- *_server = NULL;
- goto out;
-}
-
-/*
- * rename a file
- */
-int afs_vnode_rename(struct afs_vnode *orig_dvnode,
- struct afs_vnode *new_dvnode,
- struct key *key,
- const char *orig_name,
- const char *new_name)
-{
- struct afs_fs_cursor fc;
-
- _enter("%s{%x:%u.%u},%s{%u,%u,%u},%x,%s,%s",
- orig_dvnode->volume->vlocation->vldb.name,
- orig_dvnode->fid.vid,
- orig_dvnode->fid.vnode,
- orig_dvnode->fid.unique,
- new_dvnode->volume->vlocation->vldb.name,
- new_dvnode->fid.vid,
- new_dvnode->fid.vnode,
- new_dvnode->fid.unique,
- key_serial(key),
- orig_name,
- new_name);
-
- /* this op will fetch the status on both the directories we're dealing
- * with */
- spin_lock(&orig_dvnode->lock);
- orig_dvnode->update_cnt++;
- spin_unlock(&orig_dvnode->lock);
- if (new_dvnode != orig_dvnode) {
- spin_lock(&new_dvnode->lock);
- new_dvnode->update_cnt++;
- spin_unlock(&new_dvnode->lock);
- }
-
- afs_init_fs_cursor(&fc, orig_dvnode);
- do {
- /* pick a server to query */
- if (!afs_volume_pick_fileserver(&fc, orig_dvnode))
- goto no_server;
-
- fc.ac.error = afs_fs_rename(&fc, key, orig_dvnode, orig_name,
- new_dvnode, new_name, false);
-
- } while (afs_iterate_fs_cursor(&fc, orig_dvnode));
-
- /* adjust the flags */
- if (fc.ac.error == 0) {
- afs_vnode_finalise_status_update(orig_dvnode, fc.server);
- if (new_dvnode != orig_dvnode)
- afs_vnode_finalise_status_update(new_dvnode, fc.server);
- } else {
- afs_vnode_status_update_failed(&fc, orig_dvnode);
- if (new_dvnode != orig_dvnode)
- afs_vnode_status_update_failed(&fc, new_dvnode);
- }
-
-out:
- return afs_end_fs_cursor(&fc, afs_v2net(orig_dvnode));
-
-no_server:
- spin_lock(&orig_dvnode->lock);
- orig_dvnode->update_cnt--;
- ASSERTCMP(orig_dvnode->update_cnt, >=, 0);
- spin_unlock(&orig_dvnode->lock);
- if (new_dvnode != orig_dvnode) {
- spin_lock(&new_dvnode->lock);
- new_dvnode->update_cnt--;
- ASSERTCMP(new_dvnode->update_cnt, >=, 0);
- spin_unlock(&new_dvnode->lock);
- }
- goto out;
-}
-
-/*
- * write to a file
- */
-int afs_vnode_store_data(struct afs_writeback *wb, pgoff_t first, pgoff_t last,
- unsigned offset, unsigned to)
-{
- struct afs_fs_cursor fc;
- struct afs_vnode *vnode = wb->vnode;
-
- _enter("%s{%x:%u.%u},%x,%lx,%lx,%x,%x",
- vnode->volume->vlocation->vldb.name,
- vnode->fid.vid,
- vnode->fid.vnode,
- vnode->fid.unique,
- key_serial(wb->key),
- first, last, offset, to);
-
- /* this op will fetch the status */
- spin_lock(&vnode->lock);
- vnode->update_cnt++;
- spin_unlock(&vnode->lock);
-
- afs_init_fs_cursor(&fc, vnode);
- do {
- /* pick a server to query */
- if (!afs_volume_pick_fileserver(&fc, vnode))
- goto no_server;
-
- fc.ac.error = afs_fs_store_data(&fc, wb, first, last, offset, to,
- false);
-
- } while (afs_iterate_fs_cursor(&fc, vnode));
-
- /* adjust the flags */
- if (fc.ac.error == 0) {
- afs_vnode_finalise_status_update(vnode, fc.server);
- } else {
- afs_vnode_status_update_failed(&fc, vnode);
- }
-
-out:
- return afs_end_fs_cursor(&fc, afs_v2net(vnode));
-
-no_server:
- spin_lock(&vnode->lock);
- vnode->update_cnt--;
- ASSERTCMP(vnode->update_cnt, >=, 0);
- spin_unlock(&vnode->lock);
- goto out;
-}
-
-/*
- * set the attributes on a file
- */
-int afs_vnode_setattr(struct afs_vnode *vnode, struct key *key,
- struct iattr *attr)
-{
- struct afs_fs_cursor fc;
-
- _enter("%s{%x:%u.%u},%x",
- vnode->volume->vlocation->vldb.name,
- vnode->fid.vid,
- vnode->fid.vnode,
- vnode->fid.unique,
- key_serial(key));
-
- /* this op will fetch the status */
- spin_lock(&vnode->lock);
- vnode->update_cnt++;
- spin_unlock(&vnode->lock);
-
- afs_init_fs_cursor(&fc, vnode);
- do {
- /* pick a server to query */
- if (!afs_volume_pick_fileserver(&fc, vnode))
- goto no_server;
-
- fc.ac.error = afs_fs_setattr(&fc, key, vnode, attr, false);
-
- } while (afs_iterate_fs_cursor(&fc, vnode));
-
- /* adjust the flags */
- if (fc.ac.error == 0) {
- afs_vnode_finalise_status_update(vnode, fc.server);
- } else {
- afs_vnode_status_update_failed(&fc, vnode);
- }
-
-out:
- return afs_end_fs_cursor(&fc, afs_v2net(vnode));
-
-no_server:
- spin_lock(&vnode->lock);
- vnode->update_cnt--;
- ASSERTCMP(vnode->update_cnt, >=, 0);
- spin_unlock(&vnode->lock);
- goto out;
-}
-
-/*
- * get the status of a volume
- */
-int afs_vnode_get_volume_status(struct afs_vnode *vnode, struct key *key,
- struct afs_volume_status *vs)
-{
- struct afs_fs_cursor fc;
-
- _enter("%s{%x:%u.%u},%x,",
- vnode->volume->vlocation->vldb.name,
- vnode->fid.vid,
- vnode->fid.vnode,
- vnode->fid.unique,
- key_serial(key));
-
- afs_init_fs_cursor(&fc, vnode);
- do {
- /* pick a server to query */
- if (!afs_volume_pick_fileserver(&fc, vnode))
- break;
-
- fc.ac.error = afs_fs_get_volume_status(&fc, key, vnode, vs, false);
-
- } while (afs_iterate_fs_cursor(&fc, vnode));
-
- return afs_end_fs_cursor(&fc, afs_v2net(vnode));
-}
-
-/*
- * get a lock on a file
- */
-int afs_vnode_set_lock(struct afs_vnode *vnode, struct key *key,
- afs_lock_type_t type)
-{
- struct afs_fs_cursor fc;
-
- _enter("%s{%x:%u.%u},%x,%u",
- vnode->volume->vlocation->vldb.name,
- vnode->fid.vid,
- vnode->fid.vnode,
- vnode->fid.unique,
- key_serial(key), type);
-
- afs_init_fs_cursor(&fc, vnode);
- do {
- /* pick a server to query */
- if (!afs_volume_pick_fileserver(&fc, vnode))
- break;
-
- fc.ac.error = afs_fs_set_lock(&fc, key, vnode, type, false);
-
- } while (afs_iterate_fs_cursor(&fc, vnode));
-
- return afs_end_fs_cursor(&fc, afs_v2net(vnode));
-}
-
-/*
- * extend a lock on a file
- */
-int afs_vnode_extend_lock(struct afs_vnode *vnode, struct key *key)
-{
- struct afs_fs_cursor fc;
- int ret;
-
- _enter("%s{%x:%u.%u},%x",
- vnode->volume->vlocation->vldb.name,
- vnode->fid.vid,
- vnode->fid.vnode,
- vnode->fid.unique,
- key_serial(key));
-
- ret = afs_set_fs_cursor(&fc, vnode);
- if (ret < 0)
- return ret;
-
- fc.ac.error = afs_fs_extend_lock(&fc, key, vnode, false);
-
- return afs_end_fs_cursor(&fc, afs_v2net(vnode));
-}
-
-/*
- * release a lock on a file
- */
-int afs_vnode_release_lock(struct afs_vnode *vnode, struct key *key)
-{
- struct afs_fs_cursor fc;
- int ret;
-
- _enter("%s{%x:%u.%u},%x",
- vnode->volume->vlocation->vldb.name,
- vnode->fid.vid,
- vnode->fid.vnode,
- vnode->fid.unique,
- key_serial(key));
-
- ret = afs_set_fs_cursor(&fc, vnode);
- if (ret < 0)
- return ret;
-
- fc.ac.error = afs_fs_release_lock(&fc, key, vnode, false);
-
- return afs_end_fs_cursor(&fc, afs_v2net(vnode));
-}
#include <linux/slab.h>
#include "internal.h"
-static const char *afs_voltypes[] = { "R/W", "R/O", "BAK" };
+unsigned __read_mostly afs_volume_gc_delay = 10;
+unsigned __read_mostly afs_volume_record_life = 60 * 60;
+
+static const char *const afs_voltypes[] = { "R/W", "R/O", "BAK" };
/*
- * lookup a volume by name
- * - this can be one of the following:
+ * Allocate a volume record and load it up from a vldb record.
+ */
+static struct afs_volume *afs_alloc_volume(struct afs_mount_params *params,
+ struct afs_vldb_entry *vldb,
+ unsigned long type_mask)
+{
+ struct afs_server_list *slist;
+ struct afs_server *server;
+ struct afs_volume *volume;
+ int ret = -ENOMEM, nr_servers = 0, i, j;
+
+ for (i = 0; i < vldb->nr_servers; i++)
+ if (vldb->fs_mask[i] & type_mask)
+ nr_servers++;
+
+ volume = kzalloc(sizeof(struct afs_volume), GFP_KERNEL);
+ if (!volume)
+ goto error_0;
+
+ volume->vid = vldb->vid[params->type];
+ volume->update_at = ktime_get_real_seconds() + afs_volume_record_life;
+ volume->cell = afs_get_cell(params->cell);
+ volume->type = params->type;
+ volume->type_force = params->force;
+ volume->name_len = vldb->name_len;
+
+ atomic_set(&volume->usage, 1);
+ INIT_LIST_HEAD(&volume->proc_link);
+ rwlock_init(&volume->servers_lock);
+ memcpy(volume->name, vldb->name, vldb->name_len + 1);
+
+ slist = afs_alloc_server_list(params->cell, params->key, vldb, type_mask);
+ if (IS_ERR(slist)) {
+ ret = PTR_ERR(slist);
+ goto error_1;
+ }
+
+ refcount_set(&slist->usage, 1);
+ volume->servers = slist;
+
+ /* Make sure a records exists for each server this volume occupies. */
+ for (i = 0; i < nr_servers; i++) {
+ if (!(vldb->fs_mask[i] & type_mask))
+ continue;
+
+ server = afs_lookup_server(params->cell, params->key,
+ &vldb->fs_server[i]);
+ if (IS_ERR(server)) {
+ ret = PTR_ERR(server);
+ if (ret == -ENOENT)
+ continue;
+ goto error_2;
+ }
+
+ /* Insertion-sort by server pointer */
+ for (j = 0; j < slist->nr_servers; j++)
+ if (slist->servers[j].server >= server)
+ break;
+ if (j < slist->nr_servers) {
+ if (slist->servers[j].server == server) {
+ afs_put_server(params->net, server);
+ continue;
+ }
+
+ memmove(slist->servers + j + 1,
+ slist->servers + j,
+ (slist->nr_servers - j) * sizeof(struct afs_server_entry));
+ }
+
+ slist->servers[j].server = server;
+ slist->nr_servers++;
+ }
+
+ if (slist->nr_servers == 0) {
+ ret = -EDESTADDRREQ;
+ goto error_2;
+ }
+
+ return volume;
+
+error_2:
+ afs_put_serverlist(params->net, slist);
+error_1:
+ kfree(volume);
+error_0:
+ return ERR_PTR(ret);
+}
+
+/*
+ * Look up a VLDB record for a volume.
+ */
+static struct afs_vldb_entry *afs_vl_lookup_vldb(struct afs_cell *cell,
+ struct key *key,
+ const char *volname,
+ size_t volnamesz)
+{
+ struct afs_addr_cursor ac;
+ struct afs_vldb_entry *vldb;
+ int ret;
+
+ ret = afs_set_vl_cursor(&ac, cell);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ while (afs_iterate_addresses(&ac)) {
+ vldb = afs_vl_get_entry_by_name_u(cell->net, &ac, key,
+ volname, volnamesz);
+ switch (ac.error) {
+ case 0:
+ afs_end_cursor(&ac);
+ return vldb;
+ case -ECONNABORTED:
+ ac.error = afs_abort_to_error(ac.abort_code);
+ goto error;
+ case -ENOMEM:
+ case -ENONET:
+ goto error;
+ case -ENETUNREACH:
+ case -EHOSTUNREACH:
+ case -ECONNREFUSED:
+ break;
+ default:
+ ac.error = -EIO;
+ goto error;
+ }
+ }
+
+error:
+ return ERR_PTR(afs_end_cursor(&ac));
+}
+
+/*
+ * Look up a volume in the VL server and create a candidate volume record for
+ * it.
+ *
+ * The volume name can be one of the following:
* "%[cell:]volume[.]" R/W volume
* "#[cell:]volume[.]" R/O or R/W volume (rwparent=0),
* or R/W (rwparent=1) volume
* - Rule 3: If parent volume is R/W, then only mount R/W volume unless
* explicitly told otherwise
*/
-struct afs_volume *afs_volume_lookup(struct afs_mount_params *params)
+struct afs_volume *afs_create_volume(struct afs_mount_params *params)
{
- struct afs_vlocation *vlocation = NULL;
- struct afs_volume *volume = NULL;
- struct afs_server *server = NULL;
- char srvtmask;
- int ret, loop;
-
- _enter("{%*.*s,%d}",
- params->volnamesz, params->volnamesz, params->volname, params->rwpath);
-
- /* lookup the volume location record */
- vlocation = afs_vlocation_lookup(params->net, params->cell, params->key,
- params->volname, params->volnamesz);
- if (IS_ERR(vlocation)) {
- ret = PTR_ERR(vlocation);
- vlocation = NULL;
- goto error;
- }
+ struct afs_vldb_entry *vldb;
+ struct afs_volume *volume;
+ unsigned long type_mask = 1UL << params->type;
- /* make the final decision on the type we want */
- ret = -ENOMEDIUM;
- if (params->force && !(vlocation->vldb.vidmask & (1 << params->type)))
- goto error;
+ vldb = afs_vl_lookup_vldb(params->cell, params->key,
+ params->volname, params->volnamesz);
+ if (IS_ERR(vldb))
+ return ERR_CAST(vldb);
- srvtmask = 0;
- for (loop = 0; loop < vlocation->vldb.nservers; loop++)
- srvtmask |= vlocation->vldb.srvtmask[loop];
+ if (test_bit(AFS_VLDB_QUERY_ERROR, &vldb->flags)) {
+ volume = ERR_PTR(vldb->error);
+ goto error;
+ }
+ /* Make the final decision on the type we want */
+ volume = ERR_PTR(-ENOMEDIUM);
if (params->force) {
- if (!(srvtmask & (1 << params->type)))
+ if (!(vldb->flags & type_mask))
goto error;
- } else if (srvtmask & AFS_VOL_VTM_RO) {
+ } else if (test_bit(AFS_VLDB_HAS_RO, &vldb->flags)) {
params->type = AFSVL_ROVOL;
- } else if (srvtmask & AFS_VOL_VTM_RW) {
+ } else if (test_bit(AFS_VLDB_HAS_RW, &vldb->flags)) {
params->type = AFSVL_RWVOL;
} else {
goto error;
}
- down_write(¶ms->cell->vl_sem);
+ type_mask = 1UL << params->type;
+ volume = afs_alloc_volume(params, vldb, type_mask);
- /* is the volume already active? */
- if (vlocation->vols[params->type]) {
- /* yes - re-use it */
- volume = vlocation->vols[params->type];
- afs_get_volume(volume);
- goto success;
- }
+error:
+ kfree(vldb);
+ return volume;
+}
- /* create a new volume record */
- _debug("creating new volume record");
+/*
+ * Destroy a volume record
+ */
+static void afs_destroy_volume(struct afs_net *net, struct afs_volume *volume)
+{
+ _enter("%p", volume);
- ret = -ENOMEM;
- volume = kzalloc(sizeof(struct afs_volume), GFP_KERNEL);
- if (!volume)
- goto error_up;
+#ifdef CONFIG_AFS_FSCACHE
+ ASSERTCMP(volume->cache, ==, NULL);
+#endif
- atomic_set(&volume->usage, 1);
- volume->type = params->type;
- volume->type_force = params->force;
- volume->cell = params->cell;
- volume->vid = vlocation->vldb.vid[params->type];
-
- init_rwsem(&volume->server_sem);
-
- /* look up all the applicable server records */
- for (loop = 0; loop < 8; loop++) {
- if (vlocation->vldb.srvtmask[loop] & (1 << volume->type)) {
- server = afs_lookup_server(
- volume->cell, &vlocation->vldb.servers[loop]);
- if (IS_ERR(server)) {
- ret = PTR_ERR(server);
- goto error_discard;
- }
+ afs_put_serverlist(net, volume->servers);
+ afs_put_cell(net, volume->cell);
+ kfree(volume);
- volume->servers[volume->nservers] = server;
- volume->nservers++;
- }
+ _leave(" [destroyed]");
+}
+
+/*
+ * Drop a reference on a volume record.
+ */
+void afs_put_volume(struct afs_cell *cell, struct afs_volume *volume)
+{
+ if (volume) {
+ _enter("%s", volume->name);
+
+ if (atomic_dec_and_test(&volume->usage))
+ afs_destroy_volume(cell->net, volume);
}
+}
- /* attach the cache and volume location */
+/*
+ * Activate a volume.
+ */
+void afs_activate_volume(struct afs_volume *volume)
+{
#ifdef CONFIG_AFS_FSCACHE
volume->cache = fscache_acquire_cookie(volume->cell->cache,
&afs_volume_cache_index_def,
volume, true);
#endif
- afs_get_vlocation(vlocation);
- volume->vlocation = vlocation;
-
- vlocation->vols[volume->type] = volume;
-success:
- _debug("kAFS selected %s volume %08x",
- afs_voltypes[volume->type], volume->vid);
- up_write(¶ms->cell->vl_sem);
- afs_put_vlocation(params->net, vlocation);
- _leave(" = %p", volume);
- return volume;
+ write_lock(&volume->cell->proc_lock);
+ list_add_tail(&volume->proc_link, &volume->cell->proc_volumes);
+ write_unlock(&volume->cell->proc_lock);
+}
- /* clean up */
-error_up:
- up_write(¶ms->cell->vl_sem);
-error:
- afs_put_vlocation(params->net, vlocation);
- _leave(" = %d", ret);
- return ERR_PTR(ret);
+/*
+ * Deactivate a volume.
+ */
+void afs_deactivate_volume(struct afs_volume *volume)
+{
+ _enter("%s", volume->name);
-error_discard:
- up_write(¶ms->cell->vl_sem);
+ write_lock(&volume->cell->proc_lock);
+ list_del_init(&volume->proc_link);
+ write_unlock(&volume->cell->proc_lock);
- for (loop = volume->nservers - 1; loop >= 0; loop--) {
- afs_put_cb_interest(params->net, volume->cb_interests[loop]);
- afs_put_server(params->net, volume->servers[loop]);
- }
+#ifdef CONFIG_AFS_FSCACHE
+ fscache_relinquish_cookie(volume->cache,
+ test_bit(AFS_VOLUME_DELETED, &volume->flags));
+ volume->cache = NULL;
+#endif
- kfree(volume);
- goto error;
+ _leave("");
}
/*
- * destroy a volume record
+ * Query the VL service to update the volume status.
*/
-void afs_put_volume(struct afs_cell *cell, struct afs_volume *volume)
+static int afs_update_volume_status(struct afs_volume *volume, struct key *key)
{
- struct afs_vlocation *vlocation;
- int loop;
+ struct afs_server_list *new, *old, *discard;
+ struct afs_vldb_entry *vldb;
+ char idbuf[16];
+ int ret, idsz;
- if (!volume)
- return;
+ _enter("");
- _enter("%p", volume);
+ /* We look up an ID by passing it as a decimal string in the
+ * operation's name parameter.
+ */
+ idsz = sprintf(idbuf, "%u", volume->vid);
- ASSERTCMP(atomic_read(&volume->usage), >, 0);
+ vldb = afs_vl_lookup_vldb(volume->cell, key, idbuf, idsz);
+ if (IS_ERR(vldb)) {
+ ret = PTR_ERR(vldb);
+ goto error;
+ }
- vlocation = volume->vlocation;
+ /* See if the volume got renamed. */
+ if (vldb->name_len != volume->name_len ||
+ memcmp(vldb->name, volume->name, vldb->name_len) != 0) {
+ /* TODO: Use RCU'd string. */
+ memcpy(volume->name, vldb->name, AFS_MAXVOLNAME);
+ volume->name_len = vldb->name_len;
+ }
+
+ /* See if the volume's server list got updated. */
+ new = afs_alloc_server_list(volume->cell, key,
+ vldb, (1 << volume->type));
+ if (IS_ERR(new)) {
+ ret = PTR_ERR(new);
+ goto error_vldb;
+ }
- /* to prevent a race, the decrement and the dequeue must be effectively
- * atomic */
- down_write(&cell->vl_sem);
+ write_lock(&volume->servers_lock);
- if (likely(!atomic_dec_and_test(&volume->usage))) {
- up_write(&vlocation->cell->vl_sem);
- _leave("");
- return;
+ discard = new;
+ old = volume->servers;
+ if (afs_annotate_server_list(new, old)) {
+ new->seq = volume->servers_seq + 1;
+ volume->servers = new;
+ smp_wmb();
+ volume->servers_seq++;
+ discard = old;
}
- vlocation->vols[volume->type] = NULL;
+ volume->update_at = ktime_get_real_seconds() + afs_volume_record_life;
+ clear_bit(AFS_VOLUME_NEEDS_UPDATE, &volume->flags);
+ write_unlock(&volume->servers_lock);
+ ret = 0;
- up_write(&cell->vl_sem);
+ afs_put_serverlist(volume->cell->net, discard);
+error_vldb:
+ kfree(vldb);
+error:
+ _leave(" = %d", ret);
+ return ret;
+}
- /* finish cleaning up the volume */
-#ifdef CONFIG_AFS_FSCACHE
- fscache_relinquish_cookie(volume->cache, 0);
-#endif
- afs_put_vlocation(cell->net, vlocation);
+/*
+ * Make sure the volume record is up to date.
+ */
+int afs_check_volume_status(struct afs_volume *volume, struct key *key)
+{
+ time64_t now = ktime_get_real_seconds();
+ int ret, retries = 0;
- for (loop = volume->nservers - 1; loop >= 0; loop--) {
- afs_put_cb_interest(cell->net, volume->cb_interests[loop]);
- afs_put_server(cell->net, volume->servers[loop]);
+ _enter("");
+
+ if (volume->update_at <= now)
+ set_bit(AFS_VOLUME_NEEDS_UPDATE, &volume->flags);
+
+retry:
+ if (!test_bit(AFS_VOLUME_NEEDS_UPDATE, &volume->flags) &&
+ !test_bit(AFS_VOLUME_WAIT, &volume->flags)) {
+ _leave(" = 0");
+ return 0;
}
- kfree(volume);
+ if (!test_and_set_bit_lock(AFS_VOLUME_UPDATING, &volume->flags)) {
+ ret = afs_update_volume_status(volume, key);
+ clear_bit_unlock(AFS_VOLUME_WAIT, &volume->flags);
+ clear_bit_unlock(AFS_VOLUME_UPDATING, &volume->flags);
+ wake_up_bit(&volume->flags, AFS_VOLUME_WAIT);
+ _leave(" = %d", ret);
+ return ret;
+ }
- _leave(" [destroyed]");
+ if (!test_bit(AFS_VOLUME_WAIT, &volume->flags)) {
+ _leave(" = 0 [no wait]");
+ return 0;
+ }
+
+ ret = wait_on_bit(&volume->flags, AFS_VOLUME_WAIT, TASK_INTERRUPTIBLE);
+ if (ret == -ERESTARTSYS) {
+ _leave(" = %d", ret);
+ return ret;
+ }
+
+ retries++;
+ if (retries == 4) {
+ _leave(" = -ESTALE");
+ return -ESTALE;
+ }
+ goto retry;
}
req->pages[0] = page;
get_page(page);
- ret = afs_vnode_fetch_data(vnode, key, req);
+ ret = afs_fetch_data(vnode, key, req);
afs_put_read(req);
if (ret < 0) {
if (ret == -ENOENT) {
_leave("");
}
+/*
+ * write to a file
+ */
+static int afs_store_data(struct afs_writeback *wb, pgoff_t first, pgoff_t last,
+ unsigned offset, unsigned to)
+{
+ struct afs_fs_cursor fc;
+ struct afs_vnode *vnode = wb->vnode;
+ int ret;
+
+ _enter("%s{%x:%u.%u},%x,%lx,%lx,%x,%x",
+ vnode->volume->name,
+ vnode->fid.vid,
+ vnode->fid.vnode,
+ vnode->fid.unique,
+ key_serial(wb->key),
+ first, last, offset, to);
+
+ ret = -ERESTARTSYS;
+ if (afs_begin_vnode_operation(&fc, vnode, wb->key)) {
+ while (afs_select_fileserver(&fc)) {
+ fc.cb_break = vnode->cb_break + vnode->cb_s_break;
+ afs_fs_store_data(&fc, wb, first, last, offset, to);
+ }
+
+ afs_check_for_remote_deletion(&fc, fc.vnode);
+ afs_vnode_commit_status(&fc, vnode, fc.cb_break);
+ ret = afs_end_vnode_operation(&fc);
+ }
+
+ _leave(" = %d", ret);
+ return ret;
+}
+
/*
* synchronously write back the locked page and any subsequent non-locked dirty
* pages also covered by the same writeback record
_debug("write back %lx[%u..] to %lx[..%u]", first, offset, last, to);
- ret = afs_vnode_store_data(wb, first, last, offset, to);
+ ret = afs_store_data(wb, first, last, offset, to);
if (ret < 0) {
switch (ret) {
case -EDQUOT:
void *buffer, size_t size)
{
struct afs_vnode *vnode = AFS_FS_I(inode);
- const char *volname = vnode->volume->vlocation->vldb.name;
+ const char *volname = vnode->volume->name;
size_t namelen;
namelen = strlen(volname);
projects / mirror_ubuntu-bionic-kernel.git / commitdiff