#define AFS_LOCK_GRANTED 0
#define AFS_LOCK_PENDING 1
+struct workqueue_struct *afs_lock_manager;
+
static void afs_fl_copy_lock(struct file_lock *new, struct file_lock *fl);
static void afs_fl_release_private(struct file_lock *fl);
-static struct workqueue_struct *afs_lock_manager;
-static DEFINE_MUTEX(afs_lock_manager_mutex);
-
static const struct file_lock_operations afs_lock_ops = {
.fl_copy_lock = afs_fl_copy_lock,
.fl_release_private = afs_fl_release_private,
};
-/*
- * initialise the lock manager thread if it isn't already running
- */
-static int afs_init_lock_manager(void)
-{
- int ret;
-
- ret = 0;
- if (!afs_lock_manager) {
- mutex_lock(&afs_lock_manager_mutex);
- if (!afs_lock_manager) {
- afs_lock_manager = alloc_workqueue("kafs_lockd",
- WQ_MEM_RECLAIM, 0);
- if (!afs_lock_manager)
- ret = -ENOMEM;
- }
- mutex_unlock(&afs_lock_manager_mutex);
- }
- return ret;
-}
-
-/*
- * destroy the lock manager thread if it's running
- */
-void __exit afs_kill_lock_manager(void)
-{
- if (afs_lock_manager)
- destroy_workqueue(afs_lock_manager);
-}
-
/*
* if the callback is broken on this vnode, then the lock may now be available
*/
}
}
+/*
+ * 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);
}
if (fl->fl_start != 0 || fl->fl_end != OFFSET_MAX)
return -EINVAL;
- ret = afs_init_lock_manager();
- if (ret < 0)
- return ret;
-
fl->fl_ops = &afs_lock_ops;
INIT_LIST_HEAD(&fl->fl_u.afs.link);
fl->fl_u.afs.state = AFS_LOCK_PENDING;
/* make sure we've got a callback on this file and that our view of the
* data version is up to date */
- ret = afs_vnode_fetch_status(vnode, NULL, key);
+ ret = afs_validate(vnode, key);
if (ret < 0)
goto error;
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, NULL, key);
+ 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, NULL, key);
+ ret = afs_fetch_status(vnode, key);
if (ret < 0)
goto error;
lock_count = vnode->status.lock_count;
projects / mirror_ubuntu-bionic-kernel.git / blobdiff