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CIFS: check CIFS_MOUNT_NO_DFS when trying to reuse existing sb

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if we mount A then mount A again with nodfs, we shouldn't reuse the
superblock. document the purpose of the defines as well.

there are most likely more flags that needs to be added to this mask,
in fact the logic to find them should be which flag should
be *ignored* when trying to reuse an existing sb.

Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Aurelien Aptel 2019-04-02 13:00:33 +02:00 committed by Steve French
parent c8b6ac1a9d
commit d070f9dd62
1 changed files with 10 additions and 1 deletions
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11
fs/cifs/cifsglob.h
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@ -596,6 +596,10 @@ struct smb_vol {
unsigned int max_credits; /* smb3 max_credits 10 < credits < 60000 */
};
/**
* CIFS superblock mount flags (mnt_cifs_flags) to consider when
* trying to reuse existing superblock for a new mount
*/
#define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \
CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \
CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \
@ -606,8 +610,13 @@ struct smb_vol {
CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \
CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \
CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \
CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID)
CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \
CIFS_MOUNT_NO_DFS)
/**
* Generic VFS superblock mount flags (s_flags) to consider when
* trying to reuse existing superblock for a new mount
*/
#define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \
SB_NODEV | SB_SYNCHRONOUS)