Commit fa9b227e authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Al Viro
Browse files

xfs: new truncate sequence 



Convert XFS to the new truncate sequence.  We still can have errors after
updating the file size in xfs_setattr, but these are real I/O errors and lead
to a transaction abort and filesystem shutdown, so they are not an issue.

Errors from ->write_begin and write_end can now be handled correctly because
we can actually get rid of the delalloc extents while previous the buffer
state was stipped in block_invalidatepage.

There is still no error handling for ->direct_IO, because doing so will need
some major restructuring given that we only have the iolock shared and do not
hold i_mutex at all.  Fortunately leaving the normally allocated blocks behind
there is not a major issue and this will get cleaned up by xfs_free_eofblock
later.

Note: the patch is against Al's vfs.git tree as that contains the nessecary
preparations.  I'd prefer to get it applied there so that we can get some
testing in linux-next.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 2f246fd0

fs/xfs/linux-2.6/xfs_aops.c

+36 −6
Original line number Diff line number Diff line
@@ -1494,6 +1494,22 @@ xfs_vm_direct_IO( 
	return ret;

}



STATIC void

xfs_vm_write_failed(

	struct address_space	*mapping,

	loff_t			to)

{

	struct inode		*inode = mapping->host;



	if (to > inode->i_size) {

		struct iattr	ia = {

			.ia_valid	= ATTR_SIZE | ATTR_FORCE,

			.ia_size	= inode->i_size,

		};

		xfs_setattr(XFS_I(inode), &ia, XFS_ATTR_NOLOCK);

	}

}



STATIC int

xfs_vm_write_begin(

	struct file		*file,
@@ -1508,12 +1524,26 @@ xfs_vm_write_begin( 


	ret = block_write_begin(mapping, pos, len, flags | AOP_FLAG_NOFS,

				pagep, xfs_get_blocks);

	if (unlikely(ret)) {

		loff_t isize = mapping->host->i_size;

		if (pos + len > isize)

			vmtruncate(mapping->host, isize);

	if (unlikely(ret))

		xfs_vm_write_failed(mapping, pos + len);

	return ret;

}



STATIC int

xfs_vm_write_end(

	struct file		*file,

	struct address_space	*mapping,

	loff_t			pos,

	unsigned		len,

	unsigned		copied,

	struct page		*page,

	void			*fsdata)

{

	int			ret;



	ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);

	if (unlikely(ret < len))

		xfs_vm_write_failed(mapping, pos + len);

	return ret;

}
@@ -1559,7 +1589,7 @@ const struct address_space_operations xfs_address_space_operations = { 
	.releasepage		= xfs_vm_releasepage,

	.invalidatepage		= xfs_vm_invalidatepage,

	.write_begin		= xfs_vm_write_begin,

	.write_end		= generic_write_end,

	.write_end		= xfs_vm_write_end,

	.bmap			= xfs_vm_bmap,

	.direct_IO		= xfs_vm_direct_IO,

	.migratepage		= buffer_migrate_page,

fs/xfs/linux-2.6/xfs_iops.c

+0 −16
Original line number Diff line number Diff line
@@ -540,21 +540,6 @@ xfs_vn_setattr( 
	return -xfs_setattr(XFS_I(dentry->d_inode), iattr, 0);

}



/*

 * block_truncate_page can return an error, but we can't propagate it

 * at all here. Leave a complaint + stack trace in the syslog because

 * this could be bad. If it is bad, we need to propagate the error further.

 */

STATIC void

xfs_vn_truncate(

	struct inode	*inode)

{

	int	error;

	error = block_truncate_page(inode->i_mapping, inode->i_size,

							xfs_get_blocks);

	WARN_ON(error);

}



STATIC long

xfs_vn_fallocate(

	struct inode	*inode,
@@ -694,7 +679,6 @@ xfs_vn_fiemap( 


static const struct inode_operations xfs_inode_operations = {

	.check_acl		= xfs_check_acl,

	.truncate		= xfs_vn_truncate,

	.getattr		= xfs_vn_getattr,

	.setattr		= xfs_vn_setattr,

	.setxattr		= generic_setxattr,

fs/xfs/linux-2.6/xfs_linux.h

+0 −2
Original line number Diff line number Diff line
@@ -156,8 +156,6 @@ 
 */

#define xfs_sort(a,n,s,fn)	sort(a,n,s,fn,NULL)

#define xfs_stack_trace()	dump_stack()

#define xfs_itruncate_data(ip, off)	\

	(-vmtruncate(VFS_I(ip), (off)))





/* Move the kernel do_div definition off to one side */

fs/xfs/xfs_vnodeops.c

+20 −18
Original line number Diff line number Diff line
@@ -221,8 +221,11 @@ xfs_setattr( 
			 * transaction to modify the i_size.

			 */

			code = xfs_zero_eof(ip, iattr->ia_size, ip->i_size);

			if (code)

				goto error_return;

		}

		xfs_iunlock(ip, XFS_ILOCK_EXCL);

		lock_flags &= ~XFS_ILOCK_EXCL;



		/*

		 * We are going to log the inode size change in this
@@ -236,36 +239,35 @@ xfs_setattr( 
		 * really care about here and prevents waiting for other data

		 * not within the range we care about here.

		 */

		if (!code &&

		    ip->i_size != ip->i_d.di_size &&

		if (ip->i_size != ip->i_d.di_size &&

		    iattr->ia_size > ip->i_d.di_size) {

			code = xfs_flush_pages(ip,

					ip->i_d.di_size, iattr->ia_size,

					XBF_ASYNC, FI_NONE);

			if (code)

				goto error_return;

		}



		/* wait for all I/O to complete */

		xfs_ioend_wait(ip);



		if (!code)

			code = xfs_itruncate_data(ip, iattr->ia_size);

		if (code) {

			ASSERT(tp == NULL);

			lock_flags &= ~XFS_ILOCK_EXCL;

			ASSERT(lock_flags == XFS_IOLOCK_EXCL || !need_iolock);

		code = -block_truncate_page(inode->i_mapping, iattr->ia_size,

					    xfs_get_blocks);

		if (code)

			goto error_return;

		}



		tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE);

		if ((code = xfs_trans_reserve(tp, 0,

					     XFS_ITRUNCATE_LOG_RES(mp), 0,

		code = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,

					 XFS_TRANS_PERM_LOG_RES,

					     XFS_ITRUNCATE_LOG_COUNT))) {

			xfs_trans_cancel(tp, 0);

			if (need_iolock)

				xfs_iunlock(ip, XFS_IOLOCK_EXCL);

			return code;

		}

					 XFS_ITRUNCATE_LOG_COUNT);

		if (code)

			goto error_return;



		truncate_setsize(inode, iattr->ia_size);



		commit_flags = XFS_TRANS_RELEASE_LOG_RES;

		lock_flags |= XFS_ILOCK_EXCL;



		xfs_ilock(ip, XFS_ILOCK_EXCL);



		xfs_trans_ijoin(tp, ip);

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