[PATCH 5.18 242/879] cifs: return ENOENT for DFS lookup_cache_entry()

Greg Kroah-Hartman
2022-06-07T22:28:25Z

From: Enzo Matsumiya <ematsumiya@suse.de>

[ Upstream commit 337b8b0e4343567221ef8d88aac5e418208d4ac1 ]

EEXIST didn't make sense to use when dfs_cache_find() couldn't find a
cache entry nor retrieve a referral target.

It also doesn't make sense cifs_dfs_query_info_nonascii_quirk() to
emulate ENOENT anymore.

Signed-off-by: Enzo Matsumiya <ematsumiya@suse.de>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/cifs/connect.c | 6 ++++--
fs/cifs/dfs_cache.c | 6 +++---
fs/cifs/misc.c | 6 +-----
3 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 2a639fc79c30..b28b1ff39fed 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -3406,8 +3406,9 @@ cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
}

/*
- * Check if path is remote (e.g. a DFS share). Return -EREMOTE if it is,
- * otherwise 0.
+ * Check if path is remote (i.e. a DFS share).
+ *
+ * Return -EREMOTE if it is, otherwise 0 or -errno.
*/
static int is_path_remote(struct mount_ctx *mnt_ctx)
{
@@ -3697,6 +3698,7 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
if (!isdfs)
goto out;

+ /* proceed as DFS mount */
uuid_gen(&mnt_ctx.mount_id);
rc = connect_dfs_root(&mnt_ctx, &tl);
dfs_cache_free_tgts(&tl);
diff --git a/fs/cifs/dfs_cache.c b/fs/cifs/dfs_cache.c
index 956f8e5cf3e7..c5dd6f7305bd 100644
--- a/fs/cifs/dfs_cache.c
+++ b/fs/cifs/dfs_cache.c
@@ -654,7 +654,7 @@ static struct cache_entry *__lookup_cache_entry(const char *path, unsigned int h
return ce;
}
}
- return ERR_PTR(-EEXIST);
+ return ERR_PTR(-ENOENT);
}

/*
@@ -662,7 +662,7 @@ static struct cache_entry *__lookup_cache_entry(const char *path, unsigned int h
*
* Use whole path components in the match. Must be called with htable_rw_lock held.
*
- * Return ERR_PTR(-EEXIST) if the entry is not found.
+ * Return ERR_PTR(-ENOENT) if the entry is not found.
*/
static struct cache_entry *lookup_cache_entry(const char *path)
{
@@ -710,7 +710,7 @@ static struct cache_entry *lookup_cache_entry(const char *path)
while (e > s && *e != sep)
e--;
}
- return ERR_PTR(-EEXIST);
+ return ERR_PTR(-ENOENT);
}

/**
diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index 114810e563a9..5a803d686146 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -1308,7 +1308,7 @@ int cifs_update_super_prepath(struct cifs_sb_info *cifs_sb, char *prefix)
* for "\<server>\<dfsname>\<linkpath>" DFS reference,
* where <dfsname> contains non-ASCII unicode symbols.
*
- * Check such DFS reference and emulate -ENOENT if it is actual.
+ * Check such DFS reference.
*/
int cifs_dfs_query_info_nonascii_quirk(const unsigned int xid,
struct cifs_tcon *tcon,
@@ -1340,10 +1340,6 @@ int cifs_dfs_query_info_nonascii_quirk(const unsigned int xid,
cifs_dbg(FYI, "DFS ref '%s' is found, emulate -EREMOTE\n",
dfspath);
rc = -EREMOTE;
- } else if (rc == -EEXIST) {
- cifs_dbg(FYI, "DFS ref '%s' is not found, emulate -ENOENT\n",
- dfspath);
- rc = -ENOENT;
} else {
cifs_dbg(FYI, "%s: dfs_cache_find returned %d\n", __func__, rc);
}
--
2.35.1