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xfs: preallocation transactions do not need to be synchronous

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Preallocation and hole punch transactions are currently synchronous
and this is causing performance problems in some cases. The
transactions don't need to be synchronous as we don't need to
guarantee the preallocation is persistent on disk until a
fdatasync, fsync, sync operation occurs. If the file is opened
O_SYNC or O_DATASYNC, only then should the transaction be issued
synchronously.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Dave Chinner 2011-03-26 09:13:08 +11:00 committed by Dave Chinner
parent 0c9ba97318
commit 8287889742
4 changed files with 12 additions and 2 deletions
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6
fs/xfs/linux-2.6/xfs_file.c
View file

@ -896,6 +896,7 @@ xfs_file_fallocate(
xfs_flock64_t bf;
xfs_inode_t *ip = XFS_I(inode);
int cmd = XFS_IOC_RESVSP;
int attr_flags = XFS_ATTR_NOLOCK;
if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
return -EOPNOTSUPP;
@ -918,7 +919,10 @@ xfs_file_fallocate(
goto out_unlock;
}
error = -xfs_change_file_space(ip, cmd, &bf, 0, XFS_ATTR_NOLOCK);
if (file->f_flags & O_DSYNC)
attr_flags |= XFS_ATTR_SYNC;
error = -xfs_change_file_space(ip, cmd, &bf, 0, attr_flags);
if (error)
goto out_unlock;

4
fs/xfs/linux-2.6/xfs_ioctl.c
View file

@ -624,6 +624,10 @@ xfs_ioc_space(
if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
attr_flags |= XFS_ATTR_NONBLOCK;
if (filp->f_flags & O_DSYNC)
attr_flags |= XFS_ATTR_SYNC;
if (ioflags & IO_INVIS)
attr_flags |= XFS_ATTR_DMI;

3
fs/xfs/xfs_vnodeops.c
View file

@ -2831,7 +2831,8 @@ xfs_change_file_space(
ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
xfs_trans_set_sync(tp);
if (attr_flags & XFS_ATTR_SYNC)
xfs_trans_set_sync(tp);
error = xfs_trans_commit(tp, 0);

1
fs/xfs/xfs_vnodeops.h
View file

@ -18,6 +18,7 @@ int xfs_setattr(struct xfs_inode *ip, struct iattr *vap, int flags);
#define XFS_ATTR_NONBLOCK 0x02 /* return EAGAIN if operation would block */
#define XFS_ATTR_NOLOCK 0x04 /* Don't grab any conflicting locks */
#define XFS_ATTR_NOACL 0x08 /* Don't call xfs_acl_chmod */
#define XFS_ATTR_SYNC 0x10 /* synchronous operation required */
int xfs_readlink(struct xfs_inode *ip, char *link);
int xfs_release(struct xfs_inode *ip);