Commit 1baaed8f authored by Dave Chinner's avatar Dave Chinner Committed by Ben Myers
Browse files

xfs: xfs_ifree doesn't need to modify the inode buffer 



Long ago, bulkstat used to read inodes directly from the backing
buffer for speed. This had the unfortunate problem of being cache
incoherent with unlinks, and so xfs_ifree() had to mark the inode
as free directly in the backing buffer. bulkstat was changed some
time ago to use inode cache coherent lookups, and so will never see
unlinked inodes in it's lookups. Hence xfs_ifree() does not need to
touch the inode backing buffer anymore.

Signed-off-by: default avatarDave Chinner <dchinner@redhat.com>
Reviewed-by: default avatarMark Tinguely <tinguely@sgi.com>
Signed-off-by: default avatarBen Myers <bpm@sgi.com>
parent cca9f93a

fs/xfs/xfs_inode.c

+4 −28
Original line number Diff line number Diff line
@@ -2048,8 +2048,6 @@ xfs_ifree( 
	int			error;

	int			delete;

	xfs_ino_t		first_ino;

	xfs_dinode_t    	*dip;

	xfs_buf_t       	*ibp;



	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));

	ASSERT(ip->i_d.di_nlink == 0);
@@ -2062,14 +2060,13 @@ xfs_ifree( 
	 * Pull the on-disk inode from the AGI unlinked list.

	 */

	error = xfs_iunlink_remove(tp, ip);

	if (error != 0) {

	if (error)

		return error;

	}



	error = xfs_difree(tp, ip->i_ino, flist, &delete, &first_ino);

	if (error != 0) {

	if (error)

		return error;

	}



	ip->i_d.di_mode = 0;		/* mark incore inode as free */

	ip->i_d.di_flags = 0;

	ip->i_d.di_dmevmask = 0;
@@ -2081,31 +2078,10 @@ xfs_ifree( 
	 * by reincarnations of this inode.

	 */

	ip->i_d.di_gen++;



	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);



	error = xfs_imap_to_bp(ip->i_mount, tp, &ip->i_imap, &dip, &ibp,

			       0, 0);

	if (error)

		return error;



        /*

	* Clear the on-disk di_mode. This is to prevent xfs_bulkstat

	* from picking up this inode when it is reclaimed (its incore state

	* initialzed but not flushed to disk yet). The in-core di_mode is

	* already cleared  and a corresponding transaction logged.

	* The hack here just synchronizes the in-core to on-disk

	* di_mode value in advance before the actual inode sync to disk.

	* This is OK because the inode is already unlinked and would never

	* change its di_mode again for this inode generation.

	* This is a temporary hack that would require a proper fix

	* in the future.

	*/

	dip->di_mode = 0;



	if (delete) {

	if (delete)

		error = xfs_ifree_cluster(ip, tp, first_ino);

	}



	return error;

}

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