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: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
index 3ac137d..66d585c 100644
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -221,8 +221,11 @@
* 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 @@
* 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,
- 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;
- }
+ code = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
+ XFS_TRANS_PERM_LOG_RES,
+ 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);