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xfs: remove the io_type field from the writeback context and ioend

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The io_type field contains what is basically a summary of information
from the inode fork and the imap.  But we can just as easily use that
information directly, simplifying a few bits here and there and
improving the trace points.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig
2019-02-15 08:02:46 -08:00
committed by Darrick J. Wong
parent c4a6bf7f6c
commit be225fec72
5 changed files with 63 additions and 98 deletions
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93
fs/xfs/xfs_aops.c
View File

@@ -28,7 +28,7 @@
*/
struct xfs_writepage_ctx {
struct xfs_bmbt_irec imap;
unsigned int io_type;
int fork;
unsigned int data_seq;
unsigned int cow_seq;
struct xfs_ioend *ioend;
@@ -256,30 +256,20 @@ xfs_end_io(
*/
error = blk_status_to_errno(ioend->io_bio->bi_status);
if (unlikely(error)) {
switch (ioend->io_type) {
case XFS_IO_COW:
if (ioend->io_fork == XFS_COW_FORK)
xfs_reflink_cancel_cow_range(ip, offset, size, true);
break;
}
goto done;
}
/*
* Success: commit the COW or unwritten blocks if needed.
* Success: commit the COW or unwritten blocks if needed.
*/
switch (ioend->io_type) {
case XFS_IO_COW:
if (ioend->io_fork == XFS_COW_FORK)
error = xfs_reflink_end_cow(ip, offset, size);
break;
case XFS_IO_UNWRITTEN:
/* writeback should never update isize */
else if (ioend->io_state == XFS_EXT_UNWRITTEN)
error = xfs_iomap_write_unwritten(ip, offset, size, false);
break;
default:
else
ASSERT(!xfs_ioend_is_append(ioend) || ioend->io_append_trans);
break;
}
done:
if (ioend->io_append_trans)
@@ -294,7 +284,8 @@ xfs_end_bio(
struct xfs_ioend *ioend = bio->bi_private;
struct xfs_mount *mp = XFS_I(ioend->io_inode)->i_mount;
if (ioend->io_type == XFS_IO_UNWRITTEN || ioend->io_type == XFS_IO_COW)
if (ioend->io_fork == XFS_COW_FORK ||
ioend->io_state == XFS_EXT_UNWRITTEN)
queue_work(mp->m_unwritten_workqueue, &ioend->io_work);
else if (ioend->io_append_trans)
queue_work(mp->m_data_workqueue, &ioend->io_work);
@@ -320,7 +311,7 @@ xfs_imap_valid(
* covers the offset. Be careful to check this first because the caller
* can revalidate a COW mapping without updating the data seqno.
*/
if (wpc->io_type == XFS_IO_COW)
if (wpc->fork == XFS_COW_FORK)
return true;
/*
@@ -350,7 +341,6 @@ xfs_map_blocks(
xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset), end_fsb;
xfs_fileoff_t cow_fsb = NULLFILEOFF;
struct xfs_bmbt_irec imap;
int whichfork = XFS_DATA_FORK;
struct xfs_iext_cursor icur;
int error = 0;
@@ -400,6 +390,9 @@ xfs_map_blocks(
if (cow_fsb != NULLFILEOFF && cow_fsb <= offset_fsb) {
wpc->cow_seq = READ_ONCE(ip->i_cowfp->if_seq);
xfs_iunlock(ip, XFS_ILOCK_SHARED);
wpc->fork = XFS_COW_FORK;
/*
* Truncate can race with writeback since writeback doesn't
* take the iolock and truncate decreases the file size before
@@ -412,11 +405,13 @@ xfs_map_blocks(
* will kill the contents anyway.
*/
if (offset > i_size_read(inode)) {
wpc->io_type = XFS_IO_HOLE;
wpc->imap.br_blockcount = end_fsb - offset_fsb;
wpc->imap.br_startoff = offset_fsb;
wpc->imap.br_startblock = HOLESTARTBLOCK;
wpc->imap.br_state = XFS_EXT_NORM;
return 0;
}
whichfork = XFS_COW_FORK;
wpc->io_type = XFS_IO_COW;
goto allocate_blocks;
}
@@ -439,12 +434,14 @@ xfs_map_blocks(
wpc->data_seq = READ_ONCE(ip->i_df.if_seq);
xfs_iunlock(ip, XFS_ILOCK_SHARED);
wpc->fork = XFS_DATA_FORK;
if (imap.br_startoff > offset_fsb) {
/* landed in a hole or beyond EOF */
imap.br_blockcount = imap.br_startoff - offset_fsb;
imap.br_startoff = offset_fsb;
imap.br_startblock = HOLESTARTBLOCK;
wpc->io_type = XFS_IO_HOLE;
imap.br_state = XFS_EXT_NORM;
} else {
/*
* Truncate to the next COW extent if there is one. This is the
@@ -456,31 +453,24 @@ xfs_map_blocks(
cow_fsb < imap.br_startoff + imap.br_blockcount)
imap.br_blockcount = cow_fsb - imap.br_startoff;
if (isnullstartblock(imap.br_startblock)) {
/* got a delalloc extent */
wpc->io_type = XFS_IO_DELALLOC;
/* got a delalloc extent? */
if (isnullstartblock(imap.br_startblock))
goto allocate_blocks;
}
if (imap.br_state == XFS_EXT_UNWRITTEN)
wpc->io_type = XFS_IO_UNWRITTEN;
else
wpc->io_type = XFS_IO_OVERWRITE;
}
wpc->imap = imap;
trace_xfs_map_blocks_found(ip, offset, count, wpc->io_type, &imap);
trace_xfs_map_blocks_found(ip, offset, count, wpc->fork, &imap);
return 0;
allocate_blocks:
error = xfs_iomap_write_allocate(ip, whichfork, offset, &imap,
whichfork == XFS_COW_FORK ?
error = xfs_iomap_write_allocate(ip, wpc->fork, offset, &imap,
wpc->fork == XFS_COW_FORK ?
&wpc->cow_seq : &wpc->data_seq);
if (error)
return error;
ASSERT(whichfork == XFS_COW_FORK || cow_fsb == NULLFILEOFF ||
ASSERT(wpc->fork == XFS_COW_FORK || cow_fsb == NULLFILEOFF ||
imap.br_startoff + imap.br_blockcount <= cow_fsb);
wpc->imap = imap;
trace_xfs_map_blocks_alloc(ip, offset, count, wpc->io_type, &imap);
trace_xfs_map_blocks_alloc(ip, offset, count, wpc->fork, &imap);
return 0;
}
@@ -505,7 +495,7 @@ xfs_submit_ioend(
int status)
{
/* Convert CoW extents to regular */
if (!status && ioend->io_type == XFS_IO_COW) {
if (!status && ioend->io_fork == XFS_COW_FORK) {
/*
* Yuk. This can do memory allocation, but is not a
* transactional operation so everything is done in GFP_KERNEL
@@ -523,7 +513,8 @@ xfs_submit_ioend(
/* Reserve log space if we might write beyond the on-disk inode size. */
if (!status &&
ioend->io_type != XFS_IO_UNWRITTEN &&
(ioend->io_fork == XFS_COW_FORK ||
ioend->io_state != XFS_EXT_UNWRITTEN) &&
xfs_ioend_is_append(ioend) &&
!ioend->io_append_trans)
status = xfs_setfilesize_trans_alloc(ioend);
@@ -552,7 +543,8 @@ xfs_submit_ioend(
static struct xfs_ioend *
xfs_alloc_ioend(
struct inode *inode,
unsigned int type,
int fork,
xfs_exntst_t state,
xfs_off_t offset,
struct block_device *bdev,
sector_t sector)
@@ -566,7 +558,8 @@ xfs_alloc_ioend(
ioend = container_of(bio, struct xfs_ioend, io_inline_bio);
INIT_LIST_HEAD(&ioend->io_list);
ioend->io_type = type;
ioend->io_fork = fork;
ioend->io_state = state;
ioend->io_inode = inode;
ioend->io_size = 0;
ioend->io_offset = offset;
@@ -627,13 +620,15 @@ xfs_add_to_ioend(
sector = xfs_fsb_to_db(ip, wpc->imap.br_startblock) +
((offset - XFS_FSB_TO_B(mp, wpc->imap.br_startoff)) >> 9);
if (!wpc->ioend || wpc->io_type != wpc->ioend->io_type ||
if (!wpc->ioend ||
wpc->fork != wpc->ioend->io_fork ||
wpc->imap.br_state != wpc->ioend->io_state ||
sector != bio_end_sector(wpc->ioend->io_bio) ||
offset != wpc->ioend->io_offset + wpc->ioend->io_size) {
if (wpc->ioend)
list_add(&wpc->ioend->io_list, iolist);
wpc->ioend = xfs_alloc_ioend(inode, wpc->io_type, offset,
bdev, sector);
wpc->ioend = xfs_alloc_ioend(inode, wpc->fork,
wpc->imap.br_state, offset, bdev, sector);
}
if (!__bio_try_merge_page(wpc->ioend->io_bio, page, len, poff)) {
@@ -742,7 +737,7 @@ xfs_writepage_map(
error = xfs_map_blocks(wpc, inode, file_offset);
if (error)
break;
if (wpc->io_type == XFS_IO_HOLE)
if (wpc->imap.br_startblock == HOLESTARTBLOCK)
continue;
xfs_add_to_ioend(inode, file_offset, page, iop, wpc, wbc,
&submit_list);
@@ -937,9 +932,7 @@ xfs_vm_writepage(
struct page *page,
struct writeback_control *wbc)
{
struct xfs_writepage_ctx wpc = {
.io_type = XFS_IO_HOLE,
};
struct xfs_writepage_ctx wpc = { };
int ret;
ret = xfs_do_writepage(page, wbc, &wpc);
@@ -953,9 +946,7 @@ xfs_vm_writepages(
struct address_space *mapping,
struct writeback_control *wbc)
{
struct xfs_writepage_ctx wpc = {
.io_type = XFS_IO_HOLE,
};
struct xfs_writepage_ctx wpc = { };
int ret;
xfs_iflags_clear(XFS_I(mapping->host), XFS_ITRUNCATED);