diff options
| author | Sachin Prabhu <sprabhu@redhat.com> | 2016-07-29 22:38:20 +0100 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2017-10-12 15:28:21 +0100 |
| commit | f204fa8b8d4809edc87cf137ba684fbfd03b7c1c (patch) | |
| tree | f23a169dc65ed23459c705a7cc7735316c31ea78 | |
| parent | 5726cde9e952226754e150b999441a6cdd6d566e (diff) | |
Compare prepaths when comparing superblocks
commit c1d8b24d18192764fe82067ec6aa8d4c3bf094e0 upstream.
The patch
fs/cifs: make share unaccessible at root level mountable
makes use of prepaths when any component of the underlying path is
inaccessible.
When mounting 2 separate shares having different prepaths but are other
wise similar in other respects, we end up sharing superblocks when we
shouldn't be doing so.
Signed-off-by: Sachin Prabhu <sprabhu@redhat.com>
Tested-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | fs/cifs/connect.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 6d36a1e7a264..5f2a16751aa7 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -2751,6 +2751,24 @@ compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data) return 1; } +static int +match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data) +{ + struct cifs_sb_info *old = CIFS_SB(sb); + struct cifs_sb_info *new = mnt_data->cifs_sb; + + if (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) { + if (!(new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)) + return 0; + /* The prepath should be null terminated strings */ + if (strcmp(new->prepath, old->prepath)) + return 0; + + return 1; + } + return 0; +} + int cifs_match_super(struct super_block *sb, void *data) { @@ -2778,7 +2796,8 @@ cifs_match_super(struct super_block *sb, void *data) if (!match_server(tcp_srv, volume_info) || !match_session(ses, volume_info) || - !match_tcon(tcon, volume_info->UNC)) { + !match_tcon(tcon, volume_info->UNC) || + !match_prepath(sb, mnt_data)) { rc = 0; goto out; } |