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cifs: Properly handle auto disabling of serverino option 

Fix mount options comparison when serverino option is turned off later
in cifs_autodisable_serverino() and thus avoiding mismatch of new cifs
mounts.

Cc: stable@vger.kernel.org
Signed-off-by: Paulo Alcantara (SUSE) <paulo@paulo.ac>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Pavel Shilovsky <pshilove@microsoft.com>
This commit is contained in:
Paulo Alcantara (SUSE) 2019-06-18 16:16:02 -03:00 committed by Steve French
parent dc179268cd
commit 29fbeb7a90
3 changed files with 12 additions and 2 deletions
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5
fs/cifs/cifs_fs_sb.h
View File

@ -83,5 +83,10 @@ struct cifs_sb_info {
* failover properly.
*/
char *origin_fullpath; /* \\HOST\SHARE\[OPTIONAL PATH] */
/*
* Indicate whether serverino option was turned off later
* (cifs_autodisable_serverino) in order to match new mounts.
*/
bool mnt_cifs_serverino_autodisabled;
};
#endif /* _CIFS_FS_SB_H */

8
fs/cifs/connect.c
View File

@ -3467,12 +3467,16 @@ compare_mount_options(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;
unsigned int oldflags = old->mnt_cifs_flags & CIFS_MOUNT_MASK;
unsigned int newflags = new->mnt_cifs_flags & CIFS_MOUNT_MASK;
if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
return 0;
if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
(new->mnt_cifs_flags & CIFS_MOUNT_MASK))
if (old->mnt_cifs_serverino_autodisabled)
newflags &= ~CIFS_MOUNT_SERVER_INUM;
if (oldflags != newflags)
return 0;
/*

1
fs/cifs/misc.c
View File

@ -539,6 +539,7 @@ cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb)
tcon = cifs_sb_master_tcon(cifs_sb);
cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
cifs_sb->mnt_cifs_serverino_autodisabled = true;
cifs_dbg(VFS, "Autodisabling the use of server inode numbers on %s.\n",
tcon ? tcon->treeName : "new server");
cifs_dbg(VFS, "The server doesn't seem to support them properly or the files might be on different servers (DFS).\n");