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authorPaulo Alcantara <pc@cjr.nz>2022-03-04 19:22:15 +0300
committerSteve French <stfrench@microsoft.com>2022-03-22 07:30:14 +0300
commit5d7e282541fc91b831a5c4477c5d72881c623df9 (patch)
treeef49f0e9acc8da6dff8b297bca7e8c58207eabd7 /fs/cifs
parentdca65818c80cf06e0f08ba2cf94060a5236e73c2 (diff)
downloadlinux-5d7e282541fc91b831a5c4477c5d72881c623df9.tar.xz
cifs: do not skip link targets when an I/O fails
When I/O fails in one of the currently connected DFS targets, retry it from other targets as specified in MS-DFSC "3.1.5.2 I/O Operation to +Target Fails with an Error Other Than STATUS_PATH_NOT_COVERED." Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz> Cc: stable@vger.kernel.org Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/connect.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 9964c3634322..d6f8ccc7bfe2 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -3513,6 +3513,9 @@ static int connect_dfs_target(struct mount_ctx *mnt_ctx, const char *full_path,
struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
char *oldmnt = cifs_sb->ctx->mount_options;
+ cifs_dbg(FYI, "%s: full_path=%s ref_path=%s target=%s\n", __func__, full_path, ref_path,
+ dfs_cache_get_tgt_name(tit));
+
rc = dfs_cache_get_tgt_referral(ref_path, tit, &ref);
if (rc)
goto out;
@@ -3611,13 +3614,18 @@ static int __follow_dfs_link(struct mount_ctx *mnt_ctx)
if (rc)
goto out;
- /* Try all dfs link targets */
+ /* Try all dfs link targets. If an I/O fails from currently connected DFS target with an
+ * error other than STATUS_PATH_NOT_COVERED (-EREMOTE), then retry it from other targets as
+ * specified in MS-DFSC "3.1.5.2 I/O Operation to Target Fails with an Error Other Than
+ * STATUS_PATH_NOT_COVERED."
+ */
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;
+ if (!rc || rc == -EREMOTE)
+ break;
}
}
@@ -3691,7 +3699,7 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
goto error;
rc = is_path_remote(&mnt_ctx);
- if (rc == -EREMOTE)
+ if (rc)
rc = follow_dfs_link(&mnt_ctx);
if (rc)
goto error;