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cifs: add mount option to enable local caching 

Add a mount option 'fsc' to enable local caching on CIFS.

I considered adding a separate debug bit for caching, but it appears that
debugging would be relatively easier with the normal CIFS_INFO level.

As the cifs-utils (userspace) changes are not done yet, this patch enables
'fsc' by default to enable testing.

Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Suresh Jayaraman 2010-07-05 18:13:36 +05:30 committed by Steve French
parent 56698236e1
commit fa1df75d4d
2 changed files with 9 additions and 0 deletions
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1
fs/cifs/cifs_fs_sb.h
View File

@ -35,6 +35,7 @@
#define CIFS_MOUNT_DYNPERM 0x1000 /* allow in-memory only mode setting */
#define CIFS_MOUNT_NOPOSIXBRL 0x2000 /* mandatory not posix byte range lock */
#define CIFS_MOUNT_NOSSYNC 0x4000 /* don't do slow SMBflush on every sync*/
#define CIFS_MOUNT_FSCACHE 0x8000 /* local caching enabled */
struct cifs_sb_info {
struct cifsTconInfo *tcon; /* primary mount */

8
fs/cifs/connect.c
View File

@ -98,6 +98,7 @@ struct smb_vol {
bool noblocksnd:1;
bool noautotune:1;
bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
bool fsc:1; /* enable fscache */
unsigned int rsize;
unsigned int wsize;
bool sockopt_tcp_nodelay:1;
@ -843,6 +844,9 @@ cifs_parse_mount_options(char *options, const char *devname,
/* default to using server inode numbers where available */
vol->server_ino = 1;
/* XXX: default to fsc for testing until mount.cifs pieces are done */
vol->fsc = 1;
if (!options)
return 1;
@ -1332,6 +1336,8 @@ cifs_parse_mount_options(char *options, const char *devname,
printk(KERN_WARNING "CIFS: Mount option noac not "
"supported. Instead set "
"/proc/fs/cifs/LookupCacheEnabled to 0\n");
} else if (strnicmp(data, "fsc", 3) == 0) {
vol->fsc = true;
} else
printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
data);
@ -2463,6 +2469,8 @@ static void setup_cifs_sb(struct smb_vol *pvolume_info,
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
if (pvolume_info->dynperm)
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
if (pvolume_info->fsc)
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
if (pvolume_info->direct_io) {
cFYI(1, "mounting share using direct i/o");
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;