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xfs: handle zeroing in xfs_file_iomap_begin_delay 

We only need to allocate blocks for zeroing for reflink inodes,
and for we currently have a special case for reflink files in
the otherwise direct I/O path that I'd like to get rid of.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Christoph Hellwig 2018-10-18 17:19:26 +11:00 committed by Dave Chinner
parent daa79baefc
commit 0365c5d6c3
1 changed files with 38 additions and 6 deletions
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44
fs/xfs/xfs_iomap.c
View File

@ -62,6 +62,21 @@ xfs_bmbt_to_iomap(
iomap->dax_dev = xfs_find_daxdev_for_inode(VFS_I(ip));
}
static void
xfs_hole_to_iomap(
struct xfs_inode *ip,
struct iomap *iomap,
xfs_fileoff_t offset_fsb,
xfs_fileoff_t end_fsb)
{
iomap->addr = IOMAP_NULL_ADDR;
iomap->type = IOMAP_HOLE;
iomap->offset = XFS_FSB_TO_B(ip->i_mount, offset_fsb);
iomap->length = XFS_FSB_TO_B(ip->i_mount, end_fsb - offset_fsb);
iomap->bdev = xfs_find_bdev_for_inode(VFS_I(ip));
iomap->dax_dev = xfs_find_daxdev_for_inode(VFS_I(ip));
}
xfs_extlen_t
xfs_eof_alignment(
struct xfs_inode *ip,
@ -502,6 +517,7 @@ xfs_file_iomap_begin_delay(
struct inode *inode,
loff_t offset,
loff_t count,
unsigned flags,
struct iomap *iomap)
{
struct xfs_inode *ip = XFS_I(inode);
@ -538,13 +554,23 @@ xfs_file_iomap_begin_delay(
goto out_unlock;
}
end_fsb = min(XFS_B_TO_FSB(mp, offset + count), maxbytes_fsb);
eof = !xfs_iext_lookup_extent(ip, ifp, offset_fsb, &icur, &got);
if (!eof && got.br_startoff <= offset_fsb) {
if (xfs_is_reflink_inode(ip)) {
if (eof)
got.br_startoff = end_fsb; /* fake hole until the end */
if (got.br_startoff <= offset_fsb) {
/*
* For reflink files we may need a delalloc reservation when
* overwriting shared extents. This includes zeroing of
* existing extents that contain data.
*/
if (xfs_is_reflink_inode(ip) &&
((flags & IOMAP_WRITE) ||
got.br_state != XFS_EXT_UNWRITTEN)) {
bool shared;
end_fsb = min(XFS_B_TO_FSB(mp, offset + count),
maxbytes_fsb);
xfs_trim_extent(&got, offset_fsb, end_fsb - offset_fsb);
error = xfs_reflink_reserve_cow(ip, &got, &shared);
if (error)
@ -555,6 +581,11 @@ xfs_file_iomap_begin_delay(
goto done;
}
if (flags & IOMAP_ZERO) {
xfs_hole_to_iomap(ip, iomap, offset_fsb, got.br_startoff);
goto out_unlock;
}
error = xfs_qm_dqattach_locked(ip, false);
if (error)
goto out_unlock;
@ -1009,10 +1040,11 @@ xfs_file_iomap_begin(
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
if (((flags & (IOMAP_WRITE | IOMAP_DIRECT)) == IOMAP_WRITE) &&
if ((flags & (IOMAP_WRITE | IOMAP_ZERO)) && !(flags & IOMAP_DIRECT) &&
!IS_DAX(inode) && !xfs_get_extsz_hint(ip)) {
/* Reserve delalloc blocks for regular writeback. */
return xfs_file_iomap_begin_delay(inode, offset, length, iomap);
return xfs_file_iomap_begin_delay(inode, offset, length, flags,
iomap);
}
/*