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fs/cifs: make share unaccessible at root level mountable

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commit a6b5058faf upstream.

if, when mounting //HOST/share/sub/dir/foo we can query /sub/dir/foo but
not any of the path components above:

- store the /sub/dir/foo prefix in the cifs super_block info
- in the superblock, set root dentry to the subpath dentry (instead of
  the share root)
- set a flag in the superblock to remember it
- use prefixpath when building path from a dentry

fixes bso#8950

Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Reviewed-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
[bwh: Backported to 3.16: use Jiri Slaby's backport of the change in
 cifs_root_iget()]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
This commit is contained in:
Aurelien Aptel 2016-05-25 19:59:09 +02:00 • committed by Ben Hutchings
commit a2b22f2031
5 changed files with 104 additions and 5 deletions
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