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GFS2: add barrier/nobarrier mount options 

Currently gfs2 issues barrier unconditionally.  There are various reasons
to disable them, be that just for testing or for stupid devices flushing
large battert backed caches.  Add a nobarrier option that matches xfs and
btrfs for this.  Also add a symmetric barrier option to turn it back on
at remount time.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Christoph Hellwig 2009-10-30 08:03:27 +01:00 committed by Steven Whitehouse
parent c14f5735e7
commit f25934c5f8
3 changed files with 17 additions and 0 deletions
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1
fs/gfs2/incore.h
View File

@ -429,6 +429,7 @@ struct gfs2_args {
unsigned int ar_meta:1; /* mount metafs */
unsigned int ar_discard:1; /* discard requests */
unsigned int ar_errors:2; /* errors=withdraw | panic */
unsigned int ar_nobarrier:1; /* do not send barriers */
int ar_commit; /* Commit interval */
int ar_statfs_quantum; /* The fast statfs interval */
int ar_quota_quantum; /* The quota interval */

2
fs/gfs2/ops_fstype.c
View File

@ -1131,6 +1131,8 @@ static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent
}
if (sdp->sd_args.ar_posix_acl)
sb->s_flags |= MS_POSIXACL;
if (sdp->sd_args.ar_nobarrier)
set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
sb->s_magic = GFS2_MAGIC;
sb->s_op = &gfs2_super_ops;

14
fs/gfs2/super.c
View File

@ -73,6 +73,8 @@ enum {
Opt_statfs_quantum,
Opt_statfs_percent,
Opt_quota_quantum,
Opt_barrier,
Opt_nobarrier,
Opt_error,
};
@ -107,6 +109,8 @@ static const match_table_t tokens = {
{Opt_statfs_quantum, "statfs_quantum=%d"},
{Opt_statfs_percent, "statfs_percent=%d"},
{Opt_quota_quantum, "quota_quantum=%d"},
{Opt_barrier, "barrier"},
{Opt_nobarrier, "nobarrier"},
{Opt_error, NULL}
};
@ -253,6 +257,12 @@ int gfs2_mount_args(struct gfs2_args *args, char *options)
}
args->ar_errors = GFS2_ERRORS_PANIC;
break;
case Opt_barrier:
args->ar_nobarrier = 0;
break;
case Opt_nobarrier:
args->ar_nobarrier = 1;
break;
case Opt_error:
default:
printk(KERN_WARNING "GFS2: invalid mount option: %s\n", o);
@ -1143,6 +1153,10 @@ static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
sb->s_flags |= MS_POSIXACL;
else
sb->s_flags &= ~MS_POSIXACL;
if (sdp->sd_args.ar_nobarrier)
set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
else
clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
spin_lock(&gt->gt_spin);
gt->gt_log_flush_secs = args.ar_commit;
gt->gt_quota_quantum = args.ar_quota_quantum;