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authorSteve French <sfrench@us.ibm.com>2008-12-02 17:24:33 +0000
committerSteve French <sfrench@us.ibm.com>2008-12-26 02:29:10 +0000
commit13a6e42af8d90e2e8eb7fa50adf862a525b70518 (patch)
tree5d6021da7bc49b75cca5a0947f89bde7233ebce4 /fs/cifs/cifs_fs_sb.h
parentd5c5605c27c92dac6de1a7a658af5b030847f949 (diff)
[CIFS] add mount option to send mandatory rather than advisory locks
Some applications/subsystems require mandatory byte range locks (as is used for Windows/DOS/OS2 etc). Sending advisory (posix style) byte range lock requests (instead of mandatory byte range locks) can lead to problems for these applications (which expect that other clients be prevented from writing to portions of the file which they have locked and are updating). This mount option allows mounting cifs with the new mount option "forcemand" (or "forcemandatorylock") in order to have the cifs client use mandatory byte range locks (ie SMB/CIFS/Windows/NTFS style locks) rather than posix byte range lock requests, even if the server would support posix byte range lock requests. This has no effect if the server does not support the CIFS Unix Extensions (since posix style locks require support for the CIFS Unix Extensions), but for mounts to Samba servers this can be helpful for Wine and applications that require mandatory byte range locks. Acked-by: Jeff Layton <jlayton@redhat.com> CC: Alexander Bokovoy <ab@samba.org> Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs/cifs/cifs_fs_sb.h')
-rw-r--r--fs/cifs/cifs_fs_sb.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/cifs/cifs_fs_sb.h b/fs/cifs/cifs_fs_sb.h
index 877c85409f1..5edd5cc415a 100644
--- a/fs/cifs/cifs_fs_sb.h
+++ b/fs/cifs/cifs_fs_sb.h
@@ -20,7 +20,7 @@
#define CIFS_MOUNT_NO_PERM 1 /* do not do client vfs_perm check */
#define CIFS_MOUNT_SET_UID 2 /* set current->euid in create etc. */
-#define CIFS_MOUNT_SERVER_INUM 4 /* inode numbers from uniqueid from server */
+#define CIFS_MOUNT_SERVER_INUM 4 /* inode numbers from uniqueid from server */
#define CIFS_MOUNT_DIRECT_IO 8 /* do not write nor read through page cache */
#define CIFS_MOUNT_NO_XATTR 0x10 /* if set - disable xattr support */
#define CIFS_MOUNT_MAP_SPECIAL_CHR 0x20 /* remap illegal chars in filenames */
@@ -30,7 +30,8 @@
#define CIFS_MOUNT_CIFS_ACL 0x200 /* send ACL requests to non-POSIX srv */
#define CIFS_MOUNT_OVERR_UID 0x400 /* override uid returned from server */
#define CIFS_MOUNT_OVERR_GID 0x800 /* override gid returned from server */
-#define CIFS_MOUNT_DYNPERM 0x1000 /* allow in-memory only mode setting */
+#define CIFS_MOUNT_DYNPERM 0x1000 /* allow in-memory only mode setting */
+#define CIFS_MOUNT_NOPOSIXBRL 0x2000 /* mandatory not posix byte range lock */
struct cifs_sb_info {
struct cifsTconInfo *tcon; /* primary mount */