From 8287889742940cf3c416e755322090d09f2829be Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Sat, 26 Mar 2011 09:13:08 +1100 Subject: xfs: preallocation transactions do not need to be synchronous 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 Reviewed-by: Christoph Hellwig Reviewed-by: Alex Elder --- fs/xfs/linux-2.6/xfs_file.c | 6 +++++- fs/xfs/linux-2.6/xfs_ioctl.c | 4 ++++ fs/xfs/xfs_vnodeops.c | 3 ++- fs/xfs/xfs_vnodeops.h | 1 + 4 files changed, 12 insertions(+), 2 deletions(-) diff --git a/fs/xfs/linux-2.6/xfs_file.c b/fs/xfs/linux-2.6/xfs_file.c index a55c1b46b219..52aadfbed132 100644 --- a/fs/xfs/linux-2.6/xfs_file.c +++ b/fs/xfs/linux-2.6/xfs_file.c @@ -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; diff --git a/fs/xfs/linux-2.6/xfs_ioctl.c b/fs/xfs/linux-2.6/xfs_ioctl.c index 0ca0e3c024d7..acca2c5ca3fa 100644 --- a/fs/xfs/linux-2.6/xfs_ioctl.c +++ b/fs/xfs/linux-2.6/xfs_ioctl.c @@ -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; diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c index 37d8146ee15b..c48b4217ec47 100644 --- a/fs/xfs/xfs_vnodeops.c +++ b/fs/xfs/xfs_vnodeops.c @@ -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); diff --git a/fs/xfs/xfs_vnodeops.h b/fs/xfs/xfs_vnodeops.h index f6702927eee4..3bcd23353d6c 100644 --- a/fs/xfs/xfs_vnodeops.h +++ b/fs/xfs/xfs_vnodeops.h @@ -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); -- cgit v1.2.3-58-ga151