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authorPavel Shilovsky <piastryyy@gmail.com>2011-01-24 22:16:35 +0300
committerSteve French <sfrench@us.ibm.com>2011-01-25 22:31:38 +0300
commitd39454ffe4a3c85428483b8a8a8e5e797b6363d5 (patch)
tree60d9762510ed6e1da338d5777827e18917e799bf /fs/cifs
parent72432ffcf555decbbae47f1be338e1d2f210aa69 (diff)
downloadlinux-d39454ffe4a3c85428483b8a8a8e5e797b6363d5.tar.xz
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>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/README5
-rw-r--r--fs/cifs/connect.c5
2 files changed, 10 insertions, 0 deletions
diff --git a/fs/cifs/README b/fs/cifs/README
index 46af99ab3614..fe1683590828 100644
--- 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 0cc3b81c2e84..47034af67b09 100644
--- 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;