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@xxxxxx>
---
fs/xfs/xfs_file.c | 2 +-
fs/xfs/xfs_iops.c | 28 +++++++++++++++-------------
fs/xfs/xfs_vnodeops.c | 3 +--
fs/xfs/xfs_vnodeops.h | 2 +-
4 files changed, 18 insertions(+), 17 deletions(-)
Index: xfs/fs/xfs/xfs_file.c
===================================================================
--- xfs.orig/fs/xfs/xfs_file.c 2012-11-30 18:39:45.396020469 -0800
+++ xfs/fs/xfs/xfs_file.c 2012-11-30 18:39:56.240020746 -0800
@@ -853,7 +853,7 @@ xfs_file_fallocate(
iattr.ia_valid = ATTR_SIZE;
iattr.ia_size = new_size;
- error = -xfs_setattr_size(ip, &iattr, XFS_ATTR_NOLOCK);
+ error = -xfs_setattr_size(ip, &iattr);
}
out_unlock:
Index: xfs/fs/xfs/xfs_iops.c
===================================================================
--- xfs.orig/fs/xfs/xfs_iops.c 2012-11-30 18:39:45.396020469 -0800
+++ xfs/fs/xfs/xfs_iops.c 2012-11-30 18:39:56.240020746 -0800
@@ -689,8 +689,7 @@ out_dqrele:
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);
@@ -718,11 +717,6 @@ xfs_setattr_size(
ATTR_MTIME_SET|ATTR_KILL_SUID|ATTR_KILL_SGID|
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;
@@ -736,7 +730,6 @@ xfs_setattr_size(
/*
* 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);
}
@@ -893,12 +886,21 @@ out_trans_cancel:
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
Index: xfs/fs/xfs/xfs_vnodeops.c
===================================================================
--- xfs.orig/fs/xfs/xfs_vnodeops.c 2012-11-30 18:39:45.396020469 -0800
+++ xfs/fs/xfs/xfs_vnodeops.c 2012-11-30 18:39:56.244020743 -0800
@@ -2291,8 +2291,7 @@ xfs_change_file_space(
iattr.ia_valid = ATTR_SIZE;
iattr.ia_size = startoffset;
- error = xfs_setattr_size(ip, &iattr,
- attr_flags | XFS_ATTR_NOLOCK);
+ error = xfs_setattr_size(ip, &iattr);
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
if (error)
Index: xfs/fs/xfs/xfs_vnodeops.h
===================================================================
--- xfs.orig/fs/xfs/xfs_vnodeops.h 2012-11-30 18:39:53.784020685 -0800
+++ xfs/fs/xfs/xfs_vnodeops.h 2012-11-30 18:39:56.244020743 -0800
@@ -13,7 +13,7 @@ struct xfs_inode;
int xfs_setattr_nonsize(struct xfs_inode *ip, struct iattr *vap, int flags);
-int xfs_setattr_size(struct xfs_inode *ip, struct iattr *vap, int flags);
+int xfs_setattr_size(struct xfs_inode *ip, struct iattr *iattr);
#define XFS_ATTR_DMI 0x01 /* invocation from a DMI function */
#define XFS_ATTR_NOLOCK 0x04 /* Don't grab any conflicting locks */
#define XFS_ATTR_NOACL 0x08 /* Don't call xfs_acl_chmod */
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