xfs: always take the iolock around xfs_setattr_size
There is no reason to conditionally take the iolock inside xfs_setattr_size
when we can let the caller handle it unconditionally, which just incrases
the lock hold time for the case where it was previously taken internally
by a few instructions.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 2b8952d..52ecd1c 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -709,8 +709,7 @@
int
xfs_setattr_size(
struct xfs_inode *ip,
- struct iattr *iattr,
- int flags)
+ struct iattr *iattr)
{
struct xfs_mount *mp = ip->i_mount;
struct inode *inode = VFS_I(ip);
@@ -733,15 +732,11 @@
if (error)
return XFS_ERROR(error);
+ ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
ASSERT(S_ISREG(ip->i_d.di_mode));
ASSERT((mask & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
- if (!(flags & XFS_ATTR_NOLOCK)) {
- lock_flags |= XFS_IOLOCK_EXCL;
- xfs_ilock(ip, lock_flags);
- }
-
oldsize = inode->i_size;
newsize = iattr->ia_size;
@@ -750,12 +745,11 @@
*/
if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) {
if (!(mask & (ATTR_CTIME|ATTR_MTIME)))
- goto out_unlock;
+ return 0;
/*
* Use the regular setattr path to update the timestamps.
*/
- xfs_iunlock(ip, lock_flags);
iattr->ia_valid &= ~ATTR_SIZE;
return xfs_setattr_nonsize(ip, iattr, 0);
}
@@ -765,7 +759,7 @@
*/
error = xfs_qm_dqattach(ip, 0);
if (error)
- goto out_unlock;
+ return error;
/*
* Now we can make the changes. Before we join the inode to the
@@ -783,7 +777,7 @@
*/
error = xfs_zero_eof(ip, newsize, oldsize);
if (error)
- goto out_unlock;
+ return error;
}
/*
@@ -802,7 +796,7 @@
error = -filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
ip->i_d.di_size, newsize);
if (error)
- goto out_unlock;
+ return error;
}
/*
@@ -812,7 +806,7 @@
error = -block_truncate_page(inode->i_mapping, newsize, xfs_get_blocks);
if (error)
- goto out_unlock;
+ return error;
tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE);
error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0);
@@ -916,12 +910,21 @@
STATIC int
xfs_vn_setattr(
- struct dentry *dentry,
- struct iattr *iattr)
+ struct dentry *dentry,
+ struct iattr *iattr)
{
- if (iattr->ia_valid & ATTR_SIZE)
- return -xfs_setattr_size(XFS_I(dentry->d_inode), iattr, 0);
- return -xfs_setattr_nonsize(XFS_I(dentry->d_inode), iattr, 0);
+ struct xfs_inode *ip = XFS_I(dentry->d_inode);
+ int error;
+
+ if (iattr->ia_valid & ATTR_SIZE) {
+ xfs_ilock(ip, XFS_IOLOCK_EXCL);
+ error = xfs_setattr_size(ip, iattr);
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+ } else {
+ error = xfs_setattr_nonsize(ip, iattr, 0);
+ }
+
+ return -error;
}
STATIC int