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Diffstat (limited to 'fs/cifs/dfs.c')
-rw-r--r--fs/cifs/dfs.c137
1 files changed, 105 insertions, 32 deletions
diff --git a/fs/cifs/dfs.c b/fs/cifs/dfs.c
index 3a11716b6e13..a93dbca1411b 100644
--- a/fs/cifs/dfs.c
+++ b/fs/cifs/dfs.c
@@ -99,7 +99,7 @@ static int get_session(struct cifs_mount_ctx *mnt_ctx, const char *full_path)
return rc;
}
-static int get_root_smb_session(struct cifs_mount_ctx *mnt_ctx)
+static int add_root_smb_session(struct cifs_mount_ctx *mnt_ctx)
{
struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
struct dfs_root_ses *root_ses;
@@ -127,7 +127,7 @@ static int get_dfs_conn(struct cifs_mount_ctx *mnt_ctx, const char *ref_path, co
{
struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
struct dfs_info3_param ref = {};
- bool is_refsrv = false;
+ bool is_refsrv;
int rc, rc2;
rc = dfs_cache_get_tgt_referral(ref_path + 1, tit, &ref);
@@ -157,8 +157,10 @@ static int get_dfs_conn(struct cifs_mount_ctx *mnt_ctx, const char *ref_path, co
rc = cifs_is_path_remote(mnt_ctx);
}
+ dfs_cache_noreq_update_tgthint(ref_path + 1, tit);
+
if (rc == -EREMOTE && is_refsrv) {
- rc2 = get_root_smb_session(mnt_ctx);
+ rc2 = add_root_smb_session(mnt_ctx);
if (rc2)
rc = rc2;
}
@@ -248,16 +250,19 @@ static int __dfs_mount_share(struct cifs_mount_ctx *mnt_ctx)
tcon = mnt_ctx->tcon;
mutex_lock(&server->refpath_lock);
+ spin_lock(&server->srv_lock);
if (!server->origin_fullpath) {
server->origin_fullpath = origin_fullpath;
- server->current_fullpath = server->leaf_fullpath;
origin_fullpath = NULL;
}
+ spin_unlock(&server->srv_lock);
mutex_unlock(&server->refpath_lock);
if (list_empty(&tcon->dfs_ses_list)) {
list_replace_init(&mnt_ctx->dfs_ses_list,
&tcon->dfs_ses_list);
+ queue_delayed_work(dfscache_wq, &tcon->dfs_cache_work,
+ dfs_cache_get_ttl() * HZ);
} else {
dfs_put_root_smb_sessions(&mnt_ctx->dfs_ses_list);
}
@@ -272,15 +277,21 @@ out:
int dfs_mount_share(struct cifs_mount_ctx *mnt_ctx, bool *isdfs)
{
- struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
+ struct cifs_ses *ses;
+ char *source = ctx->source;
+ bool nodfs = ctx->nodfs;
int rc;
*isdfs = false;
-
+ /* Temporarily set @ctx->source to NULL as we're not matching DFS
+ * superblocks yet. See cifs_match_super() and match_server().
+ */
+ ctx->source = NULL;
rc = get_session(mnt_ctx, NULL);
if (rc)
- return rc;
+ goto out;
+
ctx->dfs_root_ses = mnt_ctx->ses;
/*
* If called with 'nodfs' mount option, then skip DFS resolving. Otherwise unconditionally
@@ -289,23 +300,41 @@ int dfs_mount_share(struct cifs_mount_ctx *mnt_ctx, bool *isdfs)
* 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_get_referral(mnt_ctx, ctx->UNC + 1, NULL, NULL)) {
+ if (!nodfs) {
+ rc = dfs_get_referral(mnt_ctx, ctx->UNC + 1, NULL, NULL);
+ if (rc) {
+ if (rc != -ENOENT && rc != -EOPNOTSUPP)
+ goto out;
+ nodfs = true;
+ }
+ }
+ if (nodfs) {
rc = cifs_mount_get_tcon(mnt_ctx);
- if (rc)
- return rc;
-
- rc = cifs_is_path_remote(mnt_ctx);
- if (!rc || rc != -EREMOTE)
- return rc;
+ if (!rc)
+ rc = cifs_is_path_remote(mnt_ctx);
+ goto out;
}
*isdfs = true;
- rc = get_root_smb_session(mnt_ctx);
- if (rc)
- return rc;
-
- return __dfs_mount_share(mnt_ctx);
+ /*
+ * Prevent DFS root session of being put in the first call to
+ * cifs_mount_put_conns(). If another DFS root server was not found
+ * while chasing the referrals (@ctx->dfs_root_ses == @ses), then we
+ * can safely put extra refcount of @ses.
+ */
+ ses = mnt_ctx->ses;
+ mnt_ctx->ses = NULL;
+ mnt_ctx->server = NULL;
+ rc = __dfs_mount_share(mnt_ctx);
+ if (ses == ctx->dfs_root_ses)
+ cifs_put_smb_ses(ses);
+out:
+ /*
+ * Restore previous value of @ctx->source so DFS superblock can be
+ * matched in cifs_match_super().
+ */
+ ctx->source = source;
+ return rc;
}
/* Update dfs referral path of superblock */
@@ -342,10 +371,11 @@ static int update_server_fullpath(struct TCP_Server_Info *server, struct cifs_sb
rc = PTR_ERR(npath);
} else {
mutex_lock(&server->refpath_lock);
+ spin_lock(&server->srv_lock);
kfree(server->leaf_fullpath);
server->leaf_fullpath = npath;
+ spin_unlock(&server->srv_lock);
mutex_unlock(&server->refpath_lock);
- server->current_fullpath = server->leaf_fullpath;
}
return rc;
}
@@ -374,6 +404,54 @@ static int target_share_matches_server(struct TCP_Server_Info *server, char *sha
return rc;
}
+static void __tree_connect_ipc(const unsigned int xid, char *tree,
+ struct cifs_sb_info *cifs_sb,
+ struct cifs_ses *ses)
+{
+ struct TCP_Server_Info *server = ses->server;
+ struct cifs_tcon *tcon = ses->tcon_ipc;
+ int rc;
+
+ spin_lock(&ses->ses_lock);
+ spin_lock(&ses->chan_lock);
+ if (cifs_chan_needs_reconnect(ses, server) ||
+ ses->ses_status != SES_GOOD) {
+ spin_unlock(&ses->chan_lock);
+ spin_unlock(&ses->ses_lock);
+ cifs_server_dbg(FYI, "%s: skipping ipc reconnect due to disconnected ses\n",
+ __func__);
+ return;
+ }
+ spin_unlock(&ses->chan_lock);
+ spin_unlock(&ses->ses_lock);
+
+ cifs_server_lock(server);
+ scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", server->hostname);
+ cifs_server_unlock(server);
+
+ rc = server->ops->tree_connect(xid, ses, tree, tcon,
+ cifs_sb->local_nls);
+ cifs_server_dbg(FYI, "%s: tree_reconnect %s: %d\n", __func__, tree, rc);
+ spin_lock(&tcon->tc_lock);
+ if (rc) {
+ tcon->status = TID_NEED_TCON;
+ } else {
+ tcon->status = TID_GOOD;
+ tcon->need_reconnect = false;
+ }
+ spin_unlock(&tcon->tc_lock);
+}
+
+static void tree_connect_ipc(const unsigned int xid, char *tree,
+ struct cifs_sb_info *cifs_sb,
+ struct cifs_tcon *tcon)
+{
+ struct cifs_ses *ses = tcon->ses;
+
+ __tree_connect_ipc(xid, tree, cifs_sb, ses);
+ __tree_connect_ipc(xid, tree, cifs_sb, CIFS_DFS_ROOT_SES(ses));
+}
+
static int __tree_connect_dfs_target(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, char *tree, bool islink,
struct dfs_cache_tgt_list *tl)
@@ -382,7 +460,6 @@ static int __tree_connect_dfs_target(const unsigned int xid, struct cifs_tcon *t
struct TCP_Server_Info *server = tcon->ses->server;
const struct smb_version_operations *ops = server->ops;
struct cifs_ses *root_ses = CIFS_DFS_ROOT_SES(tcon->ses);
- struct cifs_tcon *ipc = root_ses->tcon_ipc;
char *share = NULL, *prefix = NULL;
struct dfs_cache_tgt_iterator *tit;
bool target_match;
@@ -403,7 +480,7 @@ static int __tree_connect_dfs_target(const unsigned int xid, struct cifs_tcon *t
share = prefix = NULL;
/* Check if share matches with tcp ses */
- rc = dfs_cache_get_tgt_share(server->current_fullpath + 1, tit, &share, &prefix);
+ rc = dfs_cache_get_tgt_share(server->leaf_fullpath + 1, tit, &share, &prefix);
if (rc) {
cifs_dbg(VFS, "%s: failed to parse target share: %d\n", __func__, rc);
break;
@@ -417,19 +494,15 @@ static int __tree_connect_dfs_target(const unsigned int xid, struct cifs_tcon *t
continue;
}
- dfs_cache_noreq_update_tgthint(server->current_fullpath + 1, tit);
-
- if (ipc->need_reconnect) {
- scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", server->hostname);
- rc = ops->tree_connect(xid, ipc->ses, tree, ipc, cifs_sb->local_nls);
- cifs_dbg(FYI, "%s: reconnect ipc: %d\n", __func__, rc);
- }
+ dfs_cache_noreq_update_tgthint(server->leaf_fullpath + 1, tit);
+ tree_connect_ipc(xid, tree, cifs_sb, tcon);
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
@@ -539,8 +612,8 @@ int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const stru
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)) {
+ if (!server->leaf_fullpath ||
+ dfs_cache_noreq_find(server->leaf_fullpath + 1, &ref, &tl)) {
rc = ops->tree_connect(xid, tcon->ses, tcon->tree_name, tcon, cifs_sb->local_nls);
goto out;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-29 06:47:47 +0000