CIFS: Add strictcache mount option

Use for switching on strict cache mode. In this mode the
client reads from the cache all the time it has Oplock Level II,
otherwise - read from the server. As for write - the client stores
a data in the cache in Exclusive Oplock case, otherwise - write
directly to the server.

Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

diff --git a/fs/cifs/README b/fs/cifs/README
index 46af99a..fe16835 100644 (file)
--- a/fs/cifs/README
+++ b/fs/cifs/README
@@ -452,6 +452,11 @@ A partial list of the supported mount options follows:
                if oplock (caching token) is granted and held. Note that
                direct allows write operations larger than page size
                to be sent to the server.
+  strictcache   Use for switching on strict cache mode. In this mode the
+               client read from the cache all the time it has Oplock Level II,
+               otherwise - read from the server. All written data are stored
+               in the cache, but if the client doesn't have Exclusive Oplock,
+               it writes the data to the server.
   acl          Allow setfacl and getfacl to manage posix ACLs if server
                supports them.  (default)
   noacl        Do not allow setfacl and getfacl calls on this mount

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 0cc3b81..47034af 100644 (file)
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -87,6 +87,7 @@ struct smb_vol {
        bool no_xattr:1;   /* set if xattr (EA) support should be disabled*/
        bool server_ino:1; /* use inode numbers from server ie UniqueId */
        bool direct_io:1;
+       bool strict_io:1; /* strict cache behavior */
        bool remap:1;      /* set to remap seven reserved chars in filenames */
        bool posix_paths:1; /* unset to not ask for posix pathnames. */
        bool no_linux_ext:1;
@@ -1344,6 +1345,8 @@ cifs_parse_mount_options(char *options, const char *devname,
                        vol->direct_io = 1;
                } else if (strnicmp(data, "forcedirectio", 13) == 0) {
                        vol->direct_io = 1;
+               } else if (strnicmp(data, "strictcache", 11) == 0) {
+                       vol->strict_io = 1;
                } else if (strnicmp(data, "noac", 4) == 0) {
                        printk(KERN_WARNING "CIFS: Mount option noac not "
                                "supported. Instead set "
@@ -2584,6 +2587,8 @@ static void setup_cifs_sb(struct smb_vol *pvolume_info,
        if (pvolume_info->multiuser)
                cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
                                            CIFS_MOUNT_NO_PERM);
+       if (pvolume_info->strict_io)
+               cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
        if (pvolume_info->direct_io) {
                cFYI(1, "mounting share using direct i/o");
                cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;