/* Drop the connection to not overload the server */
#define NUM_STATUS_IO_TIMEOUT 5
+struct mount_ctx {
+ struct cifs_sb_info *cifs_sb;
+ struct smb3_fs_context *fs_ctx;
+ unsigned int xid;
+ struct TCP_Server_Info *server;
+ struct cifs_ses *ses;
+ struct cifs_tcon *tcon;
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ struct cifs_ses *root_ses;
+ uuid_t mount_id;
+ char *origin_fullpath, *leaf_fullpath;
+#endif
+};
+
static int ip_connect(struct TCP_Server_Info *server);
static int generic_ip_connect(struct TCP_Server_Info *server);
static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
}
#ifdef CONFIG_CIFS_DFS_UPCALL
-static int reconnect_dfs_server(struct TCP_Server_Info *server, struct cifs_sb_info *cifs_sb)
+static int __reconnect_target_unlocked(struct TCP_Server_Info *server, const char *target)
+{
+ int rc;
+ char *hostname;
+
+ if (!cifs_swn_set_server_dstaddr(server)) {
+ if (server->hostname != target) {
+ hostname = extract_hostname(target);
+ if (!IS_ERR(hostname)) {
+ kfree(server->hostname);
+ server->hostname = hostname;
+ } else {
+ cifs_dbg(FYI, "%s: couldn't extract hostname or address from dfs target: %ld\n",
+ __func__, PTR_ERR(hostname));
+ cifs_dbg(FYI, "%s: default to last target server: %s\n", __func__,
+ server->hostname);
+ }
+ }
+ /* resolve the hostname again to make sure that IP address is up-to-date. */
+ rc = reconn_set_ipaddr_from_hostname(server);
+ cifs_dbg(FYI, "%s: reconn_set_ipaddr_from_hostname: rc=%d\n", __func__, rc);
+ }
+ /* Reconnect the socket */
+ if (cifs_rdma_enabled(server))
+ rc = smbd_reconnect(server);
+ else
+ rc = generic_ip_connect(server);
+
+ return rc;
+}
+
+static int reconnect_target_unlocked(struct TCP_Server_Info *server, struct dfs_cache_tgt_list *tl,
+ struct dfs_cache_tgt_iterator **target_hint)
+{
+ int rc;
+ struct dfs_cache_tgt_iterator *tit;
+
+ *target_hint = NULL;
+
+ /* If dfs target list is empty, then reconnect to last server */
+ tit = dfs_cache_get_tgt_iterator(tl);
+ if (!tit)
+ return __reconnect_target_unlocked(server, server->hostname);
+
+ /* Otherwise, try every dfs target in @tl */
+ for (; tit; tit = dfs_cache_get_next_tgt(tl, tit)) {
+ rc = __reconnect_target_unlocked(server, dfs_cache_get_tgt_name(tit));
+ if (!rc) {
+ *target_hint = tit;
+ break;
+ }
+ }
+ return rc;
+}
+
+static int reconnect_dfs_server(struct TCP_Server_Info *server)
{
int rc = 0;
- const char *refpath = cifs_sb->origin_fullpath + 1;
+ const char *refpath = server->current_fullpath + 1;
struct dfs_cache_tgt_list tl = DFS_CACHE_TGT_LIST_INIT(tl);
- struct dfs_cache_tgt_iterator *tit = NULL;
- int num_targets = 1;
- char *hostname;
+ struct dfs_cache_tgt_iterator *target_hint = NULL;
+ int num_targets = 0;
/*
* Determine the number of dfs targets the referral path in @cifs_sb resolves to.
* through /proc/fs/cifs/dfscache or the target list is empty due to server settings after
* refreshing the referral, so, in this case, default it to 1.
*/
- if (!dfs_cache_noreq_find(refpath, NULL, &tl)) {
+ if (!dfs_cache_noreq_find(refpath, NULL, &tl))
num_targets = dfs_cache_get_nr_tgts(&tl);
- if (!num_targets)
- num_targets = 1;
- }
+ if (!num_targets)
+ num_targets = 1;
if (!cifs_tcp_ses_needs_reconnect(server, num_targets))
return 0;
cifs_mark_tcp_ses_conns_for_reconnect(server);
do {
- /* Get next dfs target from target list (if any) */
- if (!tit)
- tit = dfs_cache_get_tgt_iterator(&tl);
- else
- tit = dfs_cache_get_next_tgt(&tl, tit);
-
try_to_freeze();
mutex_lock(&server->srv_mutex);
- if (!cifs_swn_set_server_dstaddr(server)) {
- /*
- * If any dfs target was selected, then update @server with either a
- * hostname or an address.
- */
- if (tit) {
- hostname = extract_hostname(dfs_cache_get_tgt_name(tit));
- if (!IS_ERR(hostname)) {
- kfree(server->hostname);
- server->hostname = hostname;
- } else {
- cifs_dbg(FYI, "%s: couldn't extract hostname or address from dfs target: %ld\n",
- __func__, PTR_ERR(hostname));
- cifs_dbg(FYI, "%s: default to last target server: %s\n",
- __func__, server->hostname);
- }
- }
- /* resolve the hostname again to make sure that IP address is up-to-date. */
- rc = reconn_set_ipaddr_from_hostname(server);
- cifs_dbg(FYI, "%s: reconn_set_ipaddr_from_hostname: rc=%d\n", __func__, rc);
- }
-
- /* Reconnect the socket */
- if (cifs_rdma_enabled(server))
- rc = smbd_reconnect(server);
- else
- rc = generic_ip_connect(server);
-
+ rc = reconnect_target_unlocked(server, &tl, &target_hint);
if (rc) {
- /* Failed to reconnect socket. Retry next dfs target. */
+ /* Failed to reconnect socket */
mutex_unlock(&server->srv_mutex);
cifs_dbg(FYI, "%s: reconnect error %d\n", __func__, rc);
msleep(3000);
continue;
}
-
/*
* Socket was created. Update tcp session status to CifsNeedNegotiate so that a
* process waiting for reconnect will know it needs to re-establish session and tcon
mutex_unlock(&server->srv_mutex);
} while (server->tcpStatus == CifsNeedReconnect);
- if (tit)
- dfs_cache_noreq_update_tgthint(refpath, tit);
+ if (target_hint)
+ dfs_cache_noreq_update_tgthint(refpath, target_hint);
dfs_cache_free_tgts(&tl);
int cifs_reconnect(struct TCP_Server_Info *server)
{
- int rc;
- struct super_block *sb;
- struct cifs_sb_info *cifs_sb;
-
- /*
- * If tcp session is not an dfs connection or it is a channel, then reconnect to last target
- * server.
- */
+ /* If tcp session is not an dfs connection, then reconnect to last target server */
spin_lock(&cifs_tcp_ses_lock);
- if (!server->is_dfs_conn || server->is_channel) {
+ if (!server->is_dfs_conn || !server->origin_fullpath || !server->leaf_fullpath) {
spin_unlock(&cifs_tcp_ses_lock);
return __cifs_reconnect(server);
}
spin_unlock(&cifs_tcp_ses_lock);
- /* If no superblock, then it might be an ipc connection */
- sb = cifs_get_tcp_super(server);
- if (IS_ERR(sb))
- return __cifs_reconnect(server);
-
- /*
- * Check for a referral path to look up in superblock. If unset, then simply reconnect to
- * last target server.
- */
- cifs_sb = CIFS_SB(sb);
- if (!cifs_sb->origin_fullpath || !cifs_sb->origin_fullpath[0])
- rc = __cifs_reconnect(server);
- else
- rc = reconnect_dfs_server(server, cifs_sb);
-
- cifs_put_tcp_super(sb);
- return rc;
+ return reconnect_dfs_server(server);
}
#else
int cifs_reconnect(struct TCP_Server_Info *server)
*/
}
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ kfree(server->origin_fullpath);
+ kfree(server->leaf_fullpath);
+#endif
kfree(server);
length = atomic_dec_return(&tcpSesAllocCount);
INIT_DELAYED_WORK(&tcp_ses->resolve, cifs_resolve_server);
INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
mutex_init(&tcp_ses->reconnect_mutex);
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ mutex_init(&tcp_ses->refpath_lock);
+#endif
memcpy(&tcp_ses->srcaddr, &ctx->srcaddr,
sizeof(tcp_ses->srcaddr));
memcpy(&tcp_ses->dstaddr, &ctx->dstaddr,
}
/* Release all succeed connections */
-static inline void mount_put_conns(struct cifs_sb_info *cifs_sb,
- unsigned int xid,
- struct TCP_Server_Info *server,
- struct cifs_ses *ses, struct cifs_tcon *tcon)
+static inline void mount_put_conns(struct mount_ctx *mnt_ctx)
{
int rc = 0;
- if (tcon)
- cifs_put_tcon(tcon);
- else if (ses)
- cifs_put_smb_ses(ses);
- else if (server)
- cifs_put_tcp_session(server, 0);
- cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
- free_xid(xid);
+ if (mnt_ctx->tcon)
+ cifs_put_tcon(mnt_ctx->tcon);
+ else if (mnt_ctx->ses)
+ cifs_put_smb_ses(mnt_ctx->ses);
+ else if (mnt_ctx->server)
+ cifs_put_tcp_session(mnt_ctx->server, 0);
+ mnt_ctx->cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
+ free_xid(mnt_ctx->xid);
}
/* Get connections for tcp, ses and tcon */
-static int mount_get_conns(struct smb3_fs_context *ctx, struct cifs_sb_info *cifs_sb,
- unsigned int *xid,
- struct TCP_Server_Info **nserver,
- struct cifs_ses **nses, struct cifs_tcon **ntcon)
+static int mount_get_conns(struct mount_ctx *mnt_ctx)
{
int rc = 0;
- struct TCP_Server_Info *server;
- struct cifs_ses *ses;
- struct cifs_tcon *tcon;
-
- *nserver = NULL;
- *nses = NULL;
- *ntcon = NULL;
+ struct TCP_Server_Info *server = NULL;
+ struct cifs_ses *ses = NULL;
+ struct cifs_tcon *tcon = NULL;
+ struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
+ struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
+ unsigned int xid;
- *xid = get_xid();
+ xid = get_xid();
/* get a reference to a tcp session */
server = cifs_get_tcp_session(ctx);
if (IS_ERR(server)) {
rc = PTR_ERR(server);
- return rc;
+ server = NULL;
+ goto out;
}
- *nserver = server;
-
/* get a reference to a SMB session */
ses = cifs_get_smb_ses(server, ctx);
if (IS_ERR(ses)) {
rc = PTR_ERR(ses);
- return rc;
+ ses = NULL;
+ goto out;
}
- *nses = ses;
-
if ((ctx->persistent == true) && (!(ses->server->capabilities &
SMB2_GLOBAL_CAP_PERSISTENT_HANDLES))) {
cifs_server_dbg(VFS, "persistent handles not supported by server\n");
- return -EOPNOTSUPP;
+ rc = -EOPNOTSUPP;
+ goto out;
}
/* search for existing tcon to this server share */
tcon = cifs_get_tcon(ses, ctx);
if (IS_ERR(tcon)) {
rc = PTR_ERR(tcon);
- return rc;
+ tcon = NULL;
+ goto out;
}
- *ntcon = tcon;
-
/* if new SMB3.11 POSIX extensions are supported do not remap / and \ */
if (tcon->posix_extensions)
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
* reset of caps checks mount to see if unix extensions disabled
* for just this mount.
*/
- reset_cifs_unix_caps(*xid, tcon, cifs_sb, ctx);
+ reset_cifs_unix_caps(xid, tcon, cifs_sb, ctx);
if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
(le64_to_cpu(tcon->fsUnixInfo.Capability) &
- CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP))
- return -EACCES;
+ CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
+ rc = -EACCES;
+ goto out;
+ }
} else
tcon->unix_ext = 0; /* server does not support them */
/* do not care if a following call succeed - informational */
if (!tcon->pipe && server->ops->qfs_tcon) {
- server->ops->qfs_tcon(*xid, tcon, cifs_sb);
+ server->ops->qfs_tcon(xid, tcon, cifs_sb);
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE) {
if (tcon->fsDevInfo.DeviceCharacteristics &
cpu_to_le32(FILE_READ_ONLY_DEVICE))
(cifs_sb->ctx->rsize > server->ops->negotiate_rsize(tcon, ctx)))
cifs_sb->ctx->rsize = server->ops->negotiate_rsize(tcon, ctx);
- return 0;
+out:
+ mnt_ctx->server = server;
+ mnt_ctx->ses = ses;
+ mnt_ctx->tcon = tcon;
+ mnt_ctx->xid = xid;
+
+ return rc;
}
static int mount_setup_tlink(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
}
#ifdef CONFIG_CIFS_DFS_UPCALL
-static int mount_get_dfs_conns(struct smb3_fs_context *ctx, struct cifs_sb_info *cifs_sb,
- unsigned int *xid, struct TCP_Server_Info **nserver,
- struct cifs_ses **nses, struct cifs_tcon **ntcon)
+/* Get unique dfs connections */
+static int mount_get_dfs_conns(struct mount_ctx *mnt_ctx)
{
int rc;
- ctx->nosharesock = true;
- rc = mount_get_conns(ctx, cifs_sb, xid, nserver, nses, ntcon);
- if (*nserver) {
+ mnt_ctx->fs_ctx->nosharesock = true;
+ rc = mount_get_conns(mnt_ctx);
+ if (mnt_ctx->server) {
cifs_dbg(FYI, "%s: marking tcp session as a dfs connection\n", __func__);
spin_lock(&cifs_tcp_ses_lock);
- (*nserver)->is_dfs_conn = true;
+ mnt_ctx->server->is_dfs_conn = true;
spin_unlock(&cifs_tcp_ses_lock);
}
return rc;
}
/*
- * expand_dfs_referral - Perform a dfs referral query and update the cifs_sb
+ * expand_dfs_referral - Update cifs_sb from dfs referral path
*
- * If a referral is found, cifs_sb->ctx->mount_options will be (re-)allocated
- * to a string containing updated options for the submount. Otherwise it
- * will be left untouched.
- *
- * Returns the rc from get_dfs_path to the caller, which can be used to
- * determine whether there were referrals.
+ * cifs_sb->ctx->mount_options will be (re-)allocated to a string containing updated options for the
+ * submount. Otherwise it will be left untouched.
*/
-static int
-expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
- struct smb3_fs_context *ctx, struct cifs_sb_info *cifs_sb,
- char *ref_path)
+static int expand_dfs_referral(struct mount_ctx *mnt_ctx, const char *full_path,
+ struct dfs_info3_param *referral)
{
int rc;
- struct dfs_info3_param referral = {0};
- char *full_path = NULL, *mdata = NULL;
-
- if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
- return -EREMOTE;
-
- full_path = build_unc_path_to_root(ctx, cifs_sb, true);
- if (IS_ERR(full_path))
- return PTR_ERR(full_path);
-
- rc = dfs_cache_find(xid, ses, cifs_sb->local_nls, cifs_remap(cifs_sb),
- ref_path, &referral, NULL);
- if (!rc) {
- char *fake_devname = NULL;
-
- mdata = cifs_compose_mount_options(cifs_sb->ctx->mount_options,
- full_path + 1, &referral,
- &fake_devname);
- free_dfs_info_param(&referral);
-
- if (IS_ERR(mdata)) {
- rc = PTR_ERR(mdata);
- mdata = NULL;
- } else {
- /*
- * We can not clear out the whole structure since we
- * no longer have an explicit function to parse
- * a mount-string. Instead we need to clear out the
- * individual fields that are no longer valid.
- */
- kfree(ctx->prepath);
- ctx->prepath = NULL;
- rc = cifs_setup_volume_info(ctx, mdata, fake_devname);
- }
- kfree(fake_devname);
- kfree(cifs_sb->ctx->mount_options);
- cifs_sb->ctx->mount_options = mdata;
- }
- kfree(full_path);
- return rc;
-}
-
-static int get_next_dfs_tgt(struct dfs_cache_tgt_list *tgt_list,
- struct dfs_cache_tgt_iterator **tgt_it)
-{
- if (!*tgt_it)
- *tgt_it = dfs_cache_get_tgt_iterator(tgt_list);
- else
- *tgt_it = dfs_cache_get_next_tgt(tgt_list, *tgt_it);
- return !*tgt_it ? -EHOSTDOWN : 0;
-}
-
-static int update_vol_info(const struct dfs_cache_tgt_iterator *tgt_it,
- struct smb3_fs_context *fake_ctx, struct smb3_fs_context *ctx)
-{
- const char *tgt = dfs_cache_get_tgt_name(tgt_it);
- int len = strlen(tgt) + 2;
- char *new_unc;
-
- new_unc = kmalloc(len, GFP_KERNEL);
- if (!new_unc)
- return -ENOMEM;
- scnprintf(new_unc, len, "\\%s", tgt);
-
- kfree(ctx->UNC);
- ctx->UNC = new_unc;
-
- if (fake_ctx->prepath) {
- kfree(ctx->prepath);
- ctx->prepath = fake_ctx->prepath;
- fake_ctx->prepath = NULL;
- }
- memcpy(&ctx->dstaddr, &fake_ctx->dstaddr, sizeof(ctx->dstaddr));
-
- return 0;
-}
-
-static int do_dfs_failover(const char *path, const char *full_path, struct cifs_sb_info *cifs_sb,
- struct smb3_fs_context *ctx, struct cifs_ses *root_ses,
- unsigned int *xid, struct TCP_Server_Info **server,
- struct cifs_ses **ses, struct cifs_tcon **tcon)
-{
- int rc;
- char *npath = NULL;
- struct dfs_cache_tgt_list tgt_list = DFS_CACHE_TGT_LIST_INIT(tgt_list);
- struct dfs_cache_tgt_iterator *tgt_it = NULL;
- struct smb3_fs_context tmp_ctx = {NULL};
-
- if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
- return -EOPNOTSUPP;
-
- npath = dfs_cache_canonical_path(path, cifs_sb->local_nls, cifs_remap(cifs_sb));
- if (IS_ERR(npath))
- return PTR_ERR(npath);
-
- cifs_dbg(FYI, "%s: path=%s full_path=%s\n", __func__, npath, full_path);
-
- rc = dfs_cache_noreq_find(npath, NULL, &tgt_list);
- if (rc)
- goto out;
- /*
- * We use a 'tmp_ctx' here because we need pass it down to the mount_{get,put} functions to
- * test connection against new DFS targets.
- */
- rc = smb3_fs_context_dup(&tmp_ctx, ctx);
- if (rc)
- goto out;
-
- for (;;) {
- struct dfs_info3_param ref = {0};
- char *fake_devname = NULL, *mdata = NULL;
-
- /* Get next DFS target server - if any */
- rc = get_next_dfs_tgt(&tgt_list, &tgt_it);
- if (rc)
- break;
-
- rc = dfs_cache_get_tgt_referral(npath, tgt_it, &ref);
- if (rc)
- break;
-
- cifs_dbg(FYI, "%s: old ctx: UNC=%s prepath=%s\n", __func__, tmp_ctx.UNC,
- tmp_ctx.prepath);
-
- mdata = cifs_compose_mount_options(cifs_sb->ctx->mount_options, full_path + 1, &ref,
- &fake_devname);
- free_dfs_info_param(&ref);
-
- if (IS_ERR(mdata)) {
- rc = PTR_ERR(mdata);
- mdata = NULL;
- } else
- rc = cifs_setup_volume_info(&tmp_ctx, mdata, fake_devname);
-
- kfree(mdata);
- kfree(fake_devname);
-
- if (rc)
- break;
-
- cifs_dbg(FYI, "%s: new ctx: UNC=%s prepath=%s\n", __func__, tmp_ctx.UNC,
- tmp_ctx.prepath);
-
- mount_put_conns(cifs_sb, *xid, *server, *ses, *tcon);
- rc = mount_get_dfs_conns(&tmp_ctx, cifs_sb, xid, server, ses, tcon);
- if (!rc || (*server && *ses)) {
- /*
- * We were able to connect to new target server. Update current context with
- * new target server.
- */
- rc = update_vol_info(tgt_it, &tmp_ctx, ctx);
- break;
- }
- }
- if (!rc) {
- cifs_dbg(FYI, "%s: final ctx: UNC=%s prepath=%s\n", __func__, tmp_ctx.UNC,
- tmp_ctx.prepath);
+ struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
+ struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
+ char *fake_devname = NULL, *mdata = NULL;
+
+ mdata = cifs_compose_mount_options(cifs_sb->ctx->mount_options, full_path + 1, referral,
+ &fake_devname);
+ if (IS_ERR(mdata)) {
+ rc = PTR_ERR(mdata);
+ mdata = NULL;
+ } else {
/*
- * Update DFS target hint in DFS referral cache with the target server we
- * successfully reconnected to.
+ * We can not clear out the whole structure since we no longer have an explicit
+ * function to parse a mount-string. Instead we need to clear out the individual
+ * fields that are no longer valid.
*/
- rc = dfs_cache_update_tgthint(*xid, root_ses ? root_ses : *ses, cifs_sb->local_nls,
- cifs_remap(cifs_sb), path, tgt_it);
+ kfree(ctx->prepath);
+ ctx->prepath = NULL;
+ rc = cifs_setup_volume_info(ctx, mdata, fake_devname);
}
+ kfree(fake_devname);
+ kfree(cifs_sb->ctx->mount_options);
+ cifs_sb->ctx->mount_options = mdata;
-out:
- kfree(npath);
- smb3_cleanup_fs_context_contents(&tmp_ctx);
- dfs_cache_free_tgts(&tgt_list);
return rc;
}
#endif
* Check if path is remote (e.g. a DFS share). Return -EREMOTE if it is,
* otherwise 0.
*/
-static int is_path_remote(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx,
- const unsigned int xid,
- struct TCP_Server_Info *server,
- struct cifs_tcon *tcon)
+static int is_path_remote(struct mount_ctx *mnt_ctx)
{
int rc;
+ struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
+ struct TCP_Server_Info *server = mnt_ctx->server;
+ unsigned int xid = mnt_ctx->xid;
+ struct cifs_tcon *tcon = mnt_ctx->tcon;
+ struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
char *full_path;
if (!server->ops->is_path_accessible)
}
#ifdef CONFIG_CIFS_DFS_UPCALL
-static void set_root_ses(struct cifs_sb_info *cifs_sb, const uuid_t *mount_id, struct cifs_ses *ses,
- struct cifs_ses **root_ses)
+static void set_root_ses(struct mount_ctx *mnt_ctx)
{
- if (ses) {
+ if (mnt_ctx->ses) {
spin_lock(&cifs_tcp_ses_lock);
- ses->ses_count++;
+ mnt_ctx->ses->ses_count++;
spin_unlock(&cifs_tcp_ses_lock);
- dfs_cache_add_refsrv_session(mount_id, ses);
+ dfs_cache_add_refsrv_session(&mnt_ctx->mount_id, mnt_ctx->ses);
}
- *root_ses = ses;
+ mnt_ctx->root_ses = mnt_ctx->ses;
}
-/* Set up next dfs prefix path in @dfs_path */
-static int next_dfs_prepath(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx,
- const unsigned int xid, struct TCP_Server_Info *server,
- struct cifs_tcon *tcon, char **dfs_path)
+static int is_dfs_mount(struct mount_ctx *mnt_ctx, bool *isdfs, struct dfs_cache_tgt_list *root_tl)
{
- char *path, *npath;
- int added_treename = is_tcon_dfs(tcon);
int rc;
+ struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
+ struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
- path = cifs_build_path_to_root(ctx, cifs_sb, tcon, added_treename);
- if (!path)
- return -ENOMEM;
+ *isdfs = true;
- rc = is_path_remote(cifs_sb, ctx, xid, server, tcon);
- if (rc == -EREMOTE) {
- struct smb3_fs_context v = {NULL};
- /* if @path contains a tree name, skip it in the prefix path */
- if (added_treename) {
- rc = smb3_parse_devname(path, &v);
- if (rc)
- goto out;
- npath = build_unc_path_to_root(&v, cifs_sb, true);
- smb3_cleanup_fs_context_contents(&v);
- } else {
- v.UNC = ctx->UNC;
- v.prepath = path + 1;
- npath = build_unc_path_to_root(&v, cifs_sb, true);
- }
+ rc = mount_get_conns(mnt_ctx);
+ /*
+ * If called with 'nodfs' mount option, then skip DFS resolving. Otherwise unconditionally
+ * try to get an DFS referral (even cached) to determine whether it is an DFS mount.
+ *
+ * Skip prefix path to provide support for DFS referrals from w2k8 servers which don't seem
+ * to respond with PATH_NOT_COVERED to requests that include the prefix.
+ */
+ if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS) ||
+ dfs_cache_find(mnt_ctx->xid, mnt_ctx->ses, cifs_sb->local_nls, cifs_remap(cifs_sb),
+ ctx->UNC + 1, NULL, root_tl)) {
+ if (rc)
+ return rc;
+ /* Check if it is fully accessible and then mount it */
+ rc = is_path_remote(mnt_ctx);
+ if (!rc)
+ *isdfs = false;
+ else if (rc != -EREMOTE)
+ return rc;
+ }
+ return 0;
+}
- if (IS_ERR(npath)) {
- rc = PTR_ERR(npath);
- goto out;
- }
+static int connect_dfs_target(struct mount_ctx *mnt_ctx, const char *full_path,
+ const char *ref_path, struct dfs_cache_tgt_iterator *tit)
+{
+ int rc;
+ struct dfs_info3_param ref = {};
+ struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
+ char *oldmnt = cifs_sb->ctx->mount_options;
- kfree(*dfs_path);
- *dfs_path = npath;
- rc = -EREMOTE;
+ rc = dfs_cache_get_tgt_referral(ref_path, tit, &ref);
+ if (rc)
+ goto out;
+
+ rc = expand_dfs_referral(mnt_ctx, full_path, &ref);
+ if (rc)
+ goto out;
+
+ /* Connect to new target only if we were redirected (e.g. mount options changed) */
+ if (oldmnt != cifs_sb->ctx->mount_options) {
+ mount_put_conns(mnt_ctx);
+ rc = mount_get_dfs_conns(mnt_ctx);
+ }
+ if (!rc) {
+ if (cifs_is_referral_server(mnt_ctx->tcon, &ref))
+ set_root_ses(mnt_ctx);
+ rc = dfs_cache_update_tgthint(mnt_ctx->xid, mnt_ctx->root_ses, cifs_sb->local_nls,
+ cifs_remap(cifs_sb), ref_path, tit);
}
out:
- kfree(path);
+ free_dfs_info_param(&ref);
return rc;
}
-/* Check if resolved targets can handle any DFS referrals */
-static int is_referral_server(const char *ref_path, struct cifs_sb_info *cifs_sb,
- struct cifs_tcon *tcon, bool *ref_server)
+static int connect_dfs_root(struct mount_ctx *mnt_ctx, struct dfs_cache_tgt_list *root_tl)
{
int rc;
- struct dfs_info3_param ref = {0};
+ char *full_path;
+ struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
+ struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
+ struct dfs_cache_tgt_iterator *tit;
- cifs_dbg(FYI, "%s: ref_path=%s\n", __func__, ref_path);
+ /* Put initial connections as they might be shared with other mounts. We need unique dfs
+ * connections per mount to properly failover, so mount_get_dfs_conns() must be used from
+ * now on.
+ */
+ mount_put_conns(mnt_ctx);
+ mount_get_dfs_conns(mnt_ctx);
- if (is_tcon_dfs(tcon)) {
- *ref_server = true;
- } else {
- char *npath;
+ full_path = build_unc_path_to_root(ctx, cifs_sb, true);
+ if (IS_ERR(full_path))
+ return PTR_ERR(full_path);
- npath = dfs_cache_canonical_path(ref_path, cifs_sb->local_nls, cifs_remap(cifs_sb));
- if (IS_ERR(npath))
- return PTR_ERR(npath);
+ mnt_ctx->origin_fullpath = dfs_cache_canonical_path(ctx->UNC, cifs_sb->local_nls,
+ cifs_remap(cifs_sb));
+ if (IS_ERR(mnt_ctx->origin_fullpath)) {
+ rc = PTR_ERR(mnt_ctx->origin_fullpath);
+ mnt_ctx->origin_fullpath = NULL;
+ goto out;
+ }
- rc = dfs_cache_noreq_find(npath, &ref, NULL);
- kfree(npath);
- if (rc) {
- cifs_dbg(VFS, "%s: dfs_cache_noreq_find: failed (rc=%d)\n", __func__, rc);
- return rc;
+ /* Try all dfs root targets */
+ for (rc = -ENOENT, tit = dfs_cache_get_tgt_iterator(root_tl);
+ tit; tit = dfs_cache_get_next_tgt(root_tl, tit)) {
+ rc = connect_dfs_target(mnt_ctx, full_path, mnt_ctx->origin_fullpath + 1, tit);
+ if (!rc) {
+ mnt_ctx->leaf_fullpath = kstrdup(mnt_ctx->origin_fullpath, GFP_KERNEL);
+ if (!mnt_ctx->leaf_fullpath)
+ rc = -ENOMEM;
+ break;
}
- cifs_dbg(FYI, "%s: ref.flags=0x%x\n", __func__, ref.flags);
- /*
- * Check if all targets are capable of handling DFS referrals as per
- * MS-DFSC 2.2.4 RESP_GET_DFS_REFERRAL.
- */
- *ref_server = !!(ref.flags & DFSREF_REFERRAL_SERVER);
- free_dfs_info_param(&ref);
}
- return 0;
+
+out:
+ kfree(full_path);
+ return rc;
}
-int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
+static int __follow_dfs_link(struct mount_ctx *mnt_ctx)
{
- int rc = 0;
- unsigned int xid;
- struct TCP_Server_Info *server = NULL;
- struct cifs_ses *ses = NULL, *root_ses = NULL;
- struct cifs_tcon *tcon = NULL;
- int count = 0;
- uuid_t mount_id = {0};
- char *ref_path = NULL, *full_path = NULL;
- char *oldmnt = NULL;
- bool ref_server = false;
+ int rc;
+ struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
+ struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
+ char *full_path;
+ struct dfs_cache_tgt_list tl = DFS_CACHE_TGT_LIST_INIT(tl);
+ struct dfs_cache_tgt_iterator *tit;
- rc = mount_get_conns(ctx, cifs_sb, &xid, &server, &ses, &tcon);
- /*
- * If called with 'nodfs' mount option, then skip DFS resolving. Otherwise unconditionally
- * try to get an DFS referral (even cached) to determine whether it is an DFS mount.
- *
- * Skip prefix path to provide support for DFS referrals from w2k8 servers which don't seem
- * to respond with PATH_NOT_COVERED to requests that include the prefix.
- */
- if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS) ||
- dfs_cache_find(xid, ses, cifs_sb->local_nls, cifs_remap(cifs_sb), ctx->UNC + 1, NULL,
- NULL)) {
- if (rc)
- goto error;
- /* Check if it is fully accessible and then mount it */
- rc = is_path_remote(cifs_sb, ctx, xid, server, tcon);
- if (!rc)
- goto out;
- if (rc != -EREMOTE)
- goto error;
+ full_path = build_unc_path_to_root(ctx, cifs_sb, true);
+ if (IS_ERR(full_path))
+ return PTR_ERR(full_path);
+
+ kfree(mnt_ctx->leaf_fullpath);
+ mnt_ctx->leaf_fullpath = dfs_cache_canonical_path(full_path, cifs_sb->local_nls,
+ cifs_remap(cifs_sb));
+ if (IS_ERR(mnt_ctx->leaf_fullpath)) {
+ rc = PTR_ERR(mnt_ctx->leaf_fullpath);
+ mnt_ctx->leaf_fullpath = NULL;
+ goto out;
}
- mount_put_conns(cifs_sb, xid, server, ses, tcon);
- /*
- * Ignore error check here because we may failover to other targets from cached a
- * referral.
- */
- (void)mount_get_dfs_conns(ctx, cifs_sb, &xid, &server, &ses, &tcon);
+ /* Get referral from dfs link */
+ rc = dfs_cache_find(mnt_ctx->xid, mnt_ctx->root_ses, cifs_sb->local_nls,
+ cifs_remap(cifs_sb), mnt_ctx->leaf_fullpath + 1, NULL, &tl);
+ if (rc)
+ goto out;
- /* Get path of DFS root */
- ref_path = build_unc_path_to_root(ctx, cifs_sb, false);
- if (IS_ERR(ref_path)) {
- rc = PTR_ERR(ref_path);
- ref_path = NULL;
- goto error;
+ /* Try all dfs link targets */
+ for (rc = -ENOENT, tit = dfs_cache_get_tgt_iterator(&tl);
+ tit; tit = dfs_cache_get_next_tgt(&tl, tit)) {
+ rc = connect_dfs_target(mnt_ctx, full_path, mnt_ctx->leaf_fullpath + 1, tit);
+ if (!rc) {
+ rc = is_path_remote(mnt_ctx);
+ break;
+ }
+ }
+
+out:
+ kfree(full_path);
+ dfs_cache_free_tgts(&tl);
+ return rc;
+}
+
+static int follow_dfs_link(struct mount_ctx *mnt_ctx)
+{
+ int rc;
+ struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
+ struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
+ char *full_path;
+ int num_links = 0;
+
+ full_path = build_unc_path_to_root(ctx, cifs_sb, true);
+ if (IS_ERR(full_path))
+ return PTR_ERR(full_path);
+
+ kfree(mnt_ctx->origin_fullpath);
+ mnt_ctx->origin_fullpath = dfs_cache_canonical_path(full_path, cifs_sb->local_nls,
+ cifs_remap(cifs_sb));
+ kfree(full_path);
+
+ if (IS_ERR(mnt_ctx->origin_fullpath)) {
+ rc = PTR_ERR(mnt_ctx->origin_fullpath);
+ mnt_ctx->origin_fullpath = NULL;
+ return rc;
}
- uuid_gen(&mount_id);
- set_root_ses(cifs_sb, &mount_id, ses, &root_ses);
do {
- /* Save full path of last DFS path we used to resolve final target server */
- kfree(full_path);
- full_path = build_unc_path_to_root(ctx, cifs_sb, !!count);
- if (IS_ERR(full_path)) {
- rc = PTR_ERR(full_path);
- full_path = NULL;
- break;
- }
- /* Chase referral */
- oldmnt = cifs_sb->ctx->mount_options;
- rc = expand_dfs_referral(xid, root_ses, ctx, cifs_sb, ref_path + 1);
- if (rc)
+ rc = __follow_dfs_link(mnt_ctx);
+ if (!rc || rc != -EREMOTE)
break;
- /* Connect to new DFS target only if we were redirected */
- if (oldmnt != cifs_sb->ctx->mount_options) {
- mount_put_conns(cifs_sb, xid, server, ses, tcon);
- rc = mount_get_dfs_conns(ctx, cifs_sb, &xid, &server, &ses, &tcon);
- }
- if (rc && !server && !ses) {
- /* Failed to connect. Try to connect to other targets in the referral. */
- rc = do_dfs_failover(ref_path + 1, full_path, cifs_sb, ctx, root_ses, &xid,
- &server, &ses, &tcon);
- }
- if (rc == -EACCES || rc == -EOPNOTSUPP || !server || !ses)
- break;
- if (!tcon)
- continue;
+ } while (rc = -ELOOP, ++num_links < MAX_NESTED_LINKS);
- /* Make sure that requests go through new root servers */
- rc = is_referral_server(ref_path + 1, cifs_sb, tcon, &ref_server);
- if (rc)
- break;
- if (ref_server)
- set_root_ses(cifs_sb, &mount_id, ses, &root_ses);
+ return rc;
+}
- /* Get next dfs path and then continue chasing them if -EREMOTE */
- rc = next_dfs_prepath(cifs_sb, ctx, xid, server, tcon, &ref_path);
- /* Prevent recursion on broken link referrals */
- if (rc == -EREMOTE && ++count > MAX_NESTED_LINKS)
- rc = -ELOOP;
- } while (rc == -EREMOTE);
+/* Set up DFS referral paths for failover */
+static void setup_server_referral_paths(struct mount_ctx *mnt_ctx)
+{
+ struct TCP_Server_Info *server = mnt_ctx->server;
+
+ server->origin_fullpath = mnt_ctx->origin_fullpath;
+ server->leaf_fullpath = mnt_ctx->leaf_fullpath;
+ server->current_fullpath = mnt_ctx->leaf_fullpath;
+ mnt_ctx->origin_fullpath = mnt_ctx->leaf_fullpath = NULL;
+}
- if (rc || !tcon || !ses)
+int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
+{
+ int rc;
+ struct mount_ctx mnt_ctx = { .cifs_sb = cifs_sb, .fs_ctx = ctx, };
+ struct dfs_cache_tgt_list tl = DFS_CACHE_TGT_LIST_INIT(tl);
+ bool isdfs;
+
+ rc = is_dfs_mount(&mnt_ctx, &isdfs, &tl);
+ if (rc)
goto error;
+ if (!isdfs)
+ goto out;
- kfree(ref_path);
- /*
- * Store DFS full path in both superblock and tree connect structures.
- *
- * For DFS root mounts, the prefix path (cifs_sb->prepath) is preserved during reconnect so
- * only the root path is set in cifs_sb->origin_fullpath and tcon->dfs_path. And for DFS
- * links, the prefix path is included in both and may be changed during reconnect. See
- * cifs_tree_connect().
- */
- ref_path = dfs_cache_canonical_path(full_path, cifs_sb->local_nls, cifs_remap(cifs_sb));
- kfree(full_path);
- full_path = NULL;
+ uuid_gen(&mnt_ctx.mount_id);
+ rc = connect_dfs_root(&mnt_ctx, &tl);
+ dfs_cache_free_tgts(&tl);
- if (IS_ERR(ref_path)) {
- rc = PTR_ERR(ref_path);
- ref_path = NULL;
+ if (rc)
goto error;
- }
- cifs_sb->origin_fullpath = ref_path;
- ref_path = kstrdup(cifs_sb->origin_fullpath, GFP_KERNEL);
- if (!ref_path) {
- rc = -ENOMEM;
+ rc = is_path_remote(&mnt_ctx);
+ if (rc == -EREMOTE)
+ rc = follow_dfs_link(&mnt_ctx);
+ if (rc)
goto error;
- }
- spin_lock(&cifs_tcp_ses_lock);
- tcon->dfs_path = ref_path;
- ref_path = NULL;
- spin_unlock(&cifs_tcp_ses_lock);
+ setup_server_referral_paths(&mnt_ctx);
/*
- * After reconnecting to a different server, unique ids won't
- * match anymore, so we disable serverino. This prevents
- * dentry revalidation to think the dentry are stale (ESTALE).
+ * After reconnecting to a different server, unique ids won't match anymore, so we disable
+ * serverino. This prevents dentry revalidation to think the dentry are stale (ESTALE).
*/
cifs_autodisable_serverino(cifs_sb);
/*
- * Force the use of prefix path to support failover on DFS paths that
- * resolve to targets that have different prefix paths.
+ * Force the use of prefix path to support failover on DFS paths that resolve to targets
+ * that have different prefix paths.
*/
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
kfree(cifs_sb->prepath);
cifs_sb->prepath = ctx->prepath;
ctx->prepath = NULL;
- uuid_copy(&cifs_sb->dfs_mount_id, &mount_id);
+ uuid_copy(&cifs_sb->dfs_mount_id, &mnt_ctx.mount_id);
out:
- free_xid(xid);
- cifs_try_adding_channels(cifs_sb, ses);
- return mount_setup_tlink(cifs_sb, ses, tcon);
+ free_xid(mnt_ctx.xid);
+ cifs_try_adding_channels(cifs_sb, mnt_ctx.ses);
+ return mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
error:
- kfree(ref_path);
- kfree(full_path);
- kfree(cifs_sb->origin_fullpath);
- dfs_cache_put_refsrv_sessions(&mount_id);
- mount_put_conns(cifs_sb, xid, server, ses, tcon);
+ dfs_cache_put_refsrv_sessions(&mnt_ctx.mount_id);
+ kfree(mnt_ctx.origin_fullpath);
+ kfree(mnt_ctx.leaf_fullpath);
+ mount_put_conns(&mnt_ctx);
return rc;
}
#else
int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
{
int rc = 0;
- unsigned int xid;
- struct cifs_ses *ses;
- struct cifs_tcon *tcon;
- struct TCP_Server_Info *server;
+ struct mount_ctx mnt_ctx = { .cifs_sb = cifs_sb, .fs_ctx = ctx, };
- rc = mount_get_conns(ctx, cifs_sb, &xid, &server, &ses, &tcon);
+ rc = mount_get_conns(&mnt_ctx);
if (rc)
goto error;
- if (tcon) {
- rc = is_path_remote(cifs_sb, ctx, xid, server, tcon);
+ if (mnt_ctx.tcon) {
+ rc = is_path_remote(&mnt_ctx);
if (rc == -EREMOTE)
rc = -EOPNOTSUPP;
if (rc)
goto error;
}
- free_xid(xid);
-
- return mount_setup_tlink(cifs_sb, ses, tcon);
+ free_xid(mnt_ctx.xid);
+ return mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
error:
- mount_put_conns(cifs_sb, xid, server, ses, tcon);
+ mount_put_conns(&mnt_ctx);
return rc;
}
#endif
kfree(cifs_sb->prepath);
#ifdef CONFIG_CIFS_DFS_UPCALL
dfs_cache_put_refsrv_sessions(&cifs_sb->dfs_mount_id);
- kfree(cifs_sb->origin_fullpath);
#endif
call_rcu(&cifs_sb->rcu, delayed_free);
}
}
#ifdef CONFIG_CIFS_DFS_UPCALL
-int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const struct nls_table *nlsc)
+static void mark_tcon_tcp_ses_for_reconnect(struct cifs_tcon *tcon)
+{
+ int i;
+
+ for (i = 0; i < tcon->ses->chan_count; i++) {
+ spin_lock(&GlobalMid_Lock);
+ if (tcon->ses->chans[i].server->tcpStatus != CifsExiting)
+ tcon->ses->chans[i].server->tcpStatus = CifsNeedReconnect;
+ spin_unlock(&GlobalMid_Lock);
+ }
+}
+
+/* Update dfs referral path of superblock */
+static int update_server_fullpath(struct TCP_Server_Info *server, struct cifs_sb_info *cifs_sb,
+ const char *target)
+{
+ int rc = 0;
+ size_t len = strlen(target);
+ char *refpath, *npath;
+
+ if (unlikely(len < 2 || *target != '\\'))
+ return -EINVAL;
+
+ if (target[1] == '\\') {
+ len += 1;
+ refpath = kmalloc(len, GFP_KERNEL);
+ if (!refpath)
+ return -ENOMEM;
+
+ scnprintf(refpath, len, "%s", target);
+ } else {
+ len += sizeof("\\");
+ refpath = kmalloc(len, GFP_KERNEL);
+ if (!refpath)
+ return -ENOMEM;
+
+ scnprintf(refpath, len, "\\%s", target);
+ }
+
+ npath = dfs_cache_canonical_path(refpath, cifs_sb->local_nls, cifs_remap(cifs_sb));
+ kfree(refpath);
+
+ if (IS_ERR(npath)) {
+ rc = PTR_ERR(npath);
+ } else {
+ mutex_lock(&server->refpath_lock);
+ kfree(server->leaf_fullpath);
+ server->leaf_fullpath = npath;
+ mutex_unlock(&server->refpath_lock);
+ server->current_fullpath = server->leaf_fullpath;
+ }
+ return rc;
+}
+
+static int target_share_matches_server(struct TCP_Server_Info *server, const char *tcp_host,
+ size_t tcp_host_len, char *share, bool *target_match)
+{
+ int rc = 0;
+ const char *dfs_host;
+ size_t dfs_host_len;
+
+ *target_match = true;
+ extract_unc_hostname(share, &dfs_host, &dfs_host_len);
+
+ /* Check if hostnames or addresses match */
+ if (dfs_host_len != tcp_host_len || strncasecmp(dfs_host, tcp_host, dfs_host_len) != 0) {
+ cifs_dbg(FYI, "%s: %.*s doesn't match %.*s\n", __func__, (int)dfs_host_len,
+ dfs_host, (int)tcp_host_len, tcp_host);
+ rc = match_target_ip(server, dfs_host, dfs_host_len, target_match);
+ if (rc)
+ cifs_dbg(VFS, "%s: failed to match target ip: %d\n", __func__, rc);
+ }
+ return rc;
+}
+
+int __tree_connect_dfs_target(const unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb, char *tree,
+ struct dfs_cache_tgt_list *tl, struct dfs_info3_param *ref)
{
int rc;
struct TCP_Server_Info *server = tcon->ses->server;
const struct smb_version_operations *ops = server->ops;
- struct dfs_cache_tgt_list tl;
- struct dfs_cache_tgt_iterator *it = NULL;
- char *tree;
+ struct cifs_tcon *ipc = tcon->ses->tcon_ipc;
+ bool islink;
+ char *share = NULL, *prefix = NULL;
const char *tcp_host;
size_t tcp_host_len;
- const char *dfs_host;
- size_t dfs_host_len;
- char *share = NULL, *prefix = NULL;
- struct dfs_info3_param ref = {0};
- bool isroot;
+ struct dfs_cache_tgt_iterator *tit;
+ bool target_match;
- tree = kzalloc(MAX_TREE_SIZE, GFP_KERNEL);
- if (!tree)
- return -ENOMEM;
+ extract_unc_hostname(server->hostname, &tcp_host, &tcp_host_len);
- /* If it is not dfs or there was no cached dfs referral, then reconnect to same share */
- if (!tcon->dfs_path || dfs_cache_noreq_find(tcon->dfs_path + 1, &ref, &tl)) {
- if (tcon->ipc) {
- scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", server->hostname);
- rc = ops->tree_connect(xid, tcon->ses, tree, tcon, nlsc);
- } else {
- rc = ops->tree_connect(xid, tcon->ses, tcon->treeName, tcon, nlsc);
- }
+ islink = ref->server_type == DFS_TYPE_LINK;
+ free_dfs_info_param(ref);
+
+ tit = dfs_cache_get_tgt_iterator(tl);
+ if (!tit) {
+ rc = -ENOENT;
goto out;
}
- isroot = ref.server_type == DFS_TYPE_ROOT;
- free_dfs_info_param(&ref);
-
- extract_unc_hostname(server->hostname, &tcp_host, &tcp_host_len);
-
- for (it = dfs_cache_get_tgt_iterator(&tl); it; it = dfs_cache_get_next_tgt(&tl, it)) {
- bool target_match;
+ /* Try to tree connect to all dfs targets */
+ for (; tit; tit = dfs_cache_get_next_tgt(tl, tit)) {
+ const char *target = dfs_cache_get_tgt_name(tit);
+ struct dfs_cache_tgt_list ntl = DFS_CACHE_TGT_LIST_INIT(ntl);
kfree(share);
kfree(prefix);
- share = NULL;
- prefix = NULL;
- rc = dfs_cache_get_tgt_share(tcon->dfs_path + 1, it, &share, &prefix);
+ /* Check if share matches with tcp ses */
+ rc = dfs_cache_get_tgt_share(server->current_fullpath + 1, tit, &share, &prefix);
if (rc) {
- cifs_dbg(VFS, "%s: failed to parse target share %d\n",
- __func__, rc);
- continue;
+ cifs_dbg(VFS, "%s: failed to parse target share: %d\n", __func__, rc);
+ break;
}
- extract_unc_hostname(share, &dfs_host, &dfs_host_len);
-
- if (dfs_host_len != tcp_host_len
- || strncasecmp(dfs_host, tcp_host, dfs_host_len) != 0) {
- cifs_dbg(FYI, "%s: %.*s doesn't match %.*s\n", __func__, (int)dfs_host_len,
- dfs_host, (int)tcp_host_len, tcp_host);
+ rc = target_share_matches_server(server, tcp_host, tcp_host_len, share,
+ &target_match);
+ if (rc)
+ break;
+ if (!target_match) {
+ rc = -EHOSTUNREACH;
+ continue;
+ }
- rc = match_target_ip(server, dfs_host, dfs_host_len, &target_match);
- if (rc) {
- cifs_dbg(VFS, "%s: failed to match target ip: %d\n", __func__, rc);
+ if (ipc->need_reconnect) {
+ scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", server->hostname);
+ rc = ops->tree_connect(xid, ipc->ses, tree, ipc, cifs_sb->local_nls);
+ if (rc)
break;
- }
+ }
- if (!target_match) {
- cifs_dbg(FYI, "%s: skipping target\n", __func__);
+ scnprintf(tree, MAX_TREE_SIZE, "\\%s", share);
+ if (!islink) {
+ rc = ops->tree_connect(xid, tcon->ses, tree, tcon, cifs_sb->local_nls);
+ break;
+ }
+ /*
+ * If no dfs referrals were returned from link target, then just do a TREE_CONNECT
+ * to it. Otherwise, cache the dfs referral and then mark current tcp ses for
+ * reconnect so either the demultiplex thread or the echo worker will reconnect to
+ * newly resolved target.
+ */
+ if (dfs_cache_find(xid, tcon->ses, cifs_sb->local_nls, cifs_remap(cifs_sb), target,
+ ref, &ntl)) {
+ rc = ops->tree_connect(xid, tcon->ses, tree, tcon, cifs_sb->local_nls);
+ if (rc)
continue;
- }
+ rc = dfs_cache_noreq_update_tgthint(server->current_fullpath + 1, tit);
+ if (!rc)
+ rc = cifs_update_super_prepath(cifs_sb, prefix);
+ break;
}
+ /* Target is another dfs share */
+ rc = update_server_fullpath(server, cifs_sb, target);
+ dfs_cache_free_tgts(tl);
- if (tcon->ipc) {
- scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", share);
- rc = ops->tree_connect(xid, tcon->ses, tree, tcon, nlsc);
+ if (!rc) {
+ rc = -EREMOTE;
+ list_replace_init(&ntl.tl_list, &tl->tl_list);
} else {
- scnprintf(tree, MAX_TREE_SIZE, "\\%s", share);
- rc = ops->tree_connect(xid, tcon->ses, tree, tcon, nlsc);
- /* Only handle prefix paths of DFS link targets */
- if (!rc && !isroot) {
- rc = update_super_prepath(tcon, prefix);
- break;
- }
+ dfs_cache_free_tgts(&ntl);
+ free_dfs_info_param(ref);
}
- if (rc == -EREMOTE)
- break;
+ break;
}
+out:
kfree(share);
kfree(prefix);
- if (!rc) {
- if (it)
- rc = dfs_cache_noreq_update_tgthint(tcon->dfs_path + 1, it);
- else
- rc = -ENOENT;
+ return rc;
+}
+
+int tree_connect_dfs_target(const unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb, char *tree,
+ struct dfs_cache_tgt_list *tl, struct dfs_info3_param *ref)
+{
+ int rc;
+ int num_links = 0;
+ struct TCP_Server_Info *server = tcon->ses->server;
+
+ do {
+ rc = __tree_connect_dfs_target(xid, tcon, cifs_sb, tree, tl, ref);
+ if (!rc || rc != -EREMOTE)
+ break;
+ } while (rc = -ELOOP, ++num_links < MAX_NESTED_LINKS);
+ /*
+ * If we couldn't tree connect to any targets from last referral path, then retry from
+ * original referral path.
+ */
+ if (rc && server->current_fullpath != server->origin_fullpath) {
+ server->current_fullpath = server->origin_fullpath;
+ mark_tcon_tcp_ses_for_reconnect(tcon);
}
- dfs_cache_free_tgts(&tl);
+
+ dfs_cache_free_tgts(tl);
+ return rc;
+}
+
+int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const struct nls_table *nlsc)
+{
+ int rc;
+ struct TCP_Server_Info *server = tcon->ses->server;
+ const struct smb_version_operations *ops = server->ops;
+ struct super_block *sb = NULL;
+ struct cifs_sb_info *cifs_sb;
+ struct dfs_cache_tgt_list tl = DFS_CACHE_TGT_LIST_INIT(tl);
+ char *tree;
+ struct dfs_info3_param ref = {0};
+
+ tree = kzalloc(MAX_TREE_SIZE, GFP_KERNEL);
+ if (!tree)
+ return -ENOMEM;
+
+ if (tcon->ipc) {
+ scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", server->hostname);
+ rc = ops->tree_connect(xid, tcon->ses, tree, tcon, nlsc);
+ goto out;
+ }
+
+ sb = cifs_get_tcp_super(server);
+ if (IS_ERR(sb)) {
+ rc = PTR_ERR(sb);
+ cifs_dbg(VFS, "%s: could not find superblock: %d\n", __func__, rc);
+ goto out;
+ }
+
+ cifs_sb = CIFS_SB(sb);
+
+ /* If it is not dfs or there was no cached dfs referral, then reconnect to same share */
+ if (!server->current_fullpath ||
+ dfs_cache_noreq_find(server->current_fullpath + 1, &ref, &tl)) {
+ rc = ops->tree_connect(xid, tcon->ses, tcon->treeName, tcon, cifs_sb->local_nls);
+ goto out;
+ }
+
+ rc = tree_connect_dfs_target(xid, tcon, cifs_sb, tree, &tl, &ref);
+
out:
kfree(tree);
+ cifs_put_tcp_super(sb);
+
return rc;
}
#else
projects / mirror_ubuntu-kernels.git / commitdiff