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authorAurelien Aptel <aaptel@suse.com>2019-04-02 13:00:33 +0200
committerSteve French <stfrench@microsoft.com>2019-05-07 23:24:54 -0500
commitd070f9dd625a68d8ed4fc1de685af06a489e6f8b (patch)
tree1dca4a5138182cdb101d5ef9f4291f406d7b370a
parentc8b6ac1a9d1fb26adaeaafc3fb872e6713dfeaf7 (diff)
CIFS: check CIFS_MOUNT_NO_DFS when trying to reuse existing sb
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>
-rw-r--r--fs/cifs/cifsglob.h11
1 files changed, 10 insertions, 1 deletions
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 779ceb1f0412..0dc55f4e6929 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -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)