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xfs: use a struct iomap in xfs_writepage_ctx

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In preparation for moving the XFS writeback code to fs/iomap.c, switch
it to use struct iomap instead of the XFS-specific struct xfs_bmbt_irec.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Carlos Maiolino <cmaiolino@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
2019-10-17 13:12:06 -07:00
committed by Darrick J. Wong
parent 05b30949f1
commit 4e087a3b31
4 changed files with 50 additions and 51 deletions
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82
fs/xfs/xfs_aops.c
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@@ -22,7 +22,7 @@
* structure owned by writepages passed to individual writepage calls
*/
struct xfs_writepage_ctx {
struct xfs_bmbt_irec imap;
struct iomap iomap;
int fork;
unsigned int data_seq;
unsigned int cow_seq;
@@ -267,7 +267,7 @@ xfs_end_ioend(
*/
if (ioend->io_fork == XFS_COW_FORK)
error = xfs_reflink_end_cow(ip, offset, size);
else if (ioend->io_state == XFS_EXT_UNWRITTEN)
else if (ioend->io_type == IOMAP_UNWRITTEN)
error = xfs_iomap_write_unwritten(ip, offset, size, false);
else
ASSERT(!xfs_ioend_is_append(ioend) || ioend->io_append_trans);
@@ -300,8 +300,8 @@ xfs_ioend_can_merge(
return false;
if ((ioend->io_fork == XFS_COW_FORK) ^ (next->io_fork == XFS_COW_FORK))
return false;
if ((ioend->io_state == XFS_EXT_UNWRITTEN) ^
(next->io_state == XFS_EXT_UNWRITTEN))
if ((ioend->io_type == IOMAP_UNWRITTEN) ^
(next->io_type == IOMAP_UNWRITTEN))
return false;
if (ioend->io_offset + ioend->io_size != next->io_offset)
return false;
@@ -403,7 +403,7 @@ xfs_end_bio(
unsigned long flags;
if (ioend->io_fork == XFS_COW_FORK ||
ioend->io_state == XFS_EXT_UNWRITTEN ||
ioend->io_type == IOMAP_UNWRITTEN ||
ioend->io_append_trans != NULL) {
spin_lock_irqsave(&ip->i_ioend_lock, flags);
if (list_empty(&ip->i_ioend_list))
@@ -423,10 +423,10 @@ static bool
xfs_imap_valid(
struct xfs_writepage_ctx *wpc,
struct xfs_inode *ip,
xfs_fileoff_t offset_fsb)
loff_t offset)
{
if (offset_fsb < wpc->imap.br_startoff ||
offset_fsb >= wpc->imap.br_startoff + wpc->imap.br_blockcount)
if (offset < wpc->iomap.offset ||
offset >= wpc->iomap.offset + wpc->iomap.length)
return false;
/*
* If this is a COW mapping, it is sufficient to check that the mapping
@@ -453,7 +453,7 @@ xfs_imap_valid(
/*
* Pass in a dellalloc extent and convert it to real extents, return the real
* extent that maps offset_fsb in wpc->imap.
* extent that maps offset_fsb in wpc->iomap.
*
* The current page is held locked so nothing could have removed the block
* backing offset_fsb, although it could have moved from the COW to the data
@@ -463,23 +463,23 @@ static int
xfs_convert_blocks(
struct xfs_writepage_ctx *wpc,
struct xfs_inode *ip,
xfs_fileoff_t offset_fsb)
loff_t offset)
{
int error;
/*
* Attempt to allocate whatever delalloc extent currently backs
* offset_fsb and put the result into wpc->imap. Allocate in a loop
* because it may take several attempts to allocate real blocks for a
* contiguous delalloc extent if free space is sufficiently fragmented.
* Attempt to allocate whatever delalloc extent currently backs offset
* and put the result into wpc->iomap. Allocate in a loop because it
* may take several attempts to allocate real blocks for a contiguous
* delalloc extent if free space is sufficiently fragmented.
*/
do {
error = xfs_bmapi_convert_delalloc(ip, wpc->fork, offset_fsb,
&wpc->imap, wpc->fork == XFS_COW_FORK ?
error = xfs_bmapi_convert_delalloc(ip, wpc->fork, offset,
&wpc->iomap, wpc->fork == XFS_COW_FORK ?
&wpc->cow_seq : &wpc->data_seq);
if (error)
return error;
} while (wpc->imap.br_startoff + wpc->imap.br_blockcount <= offset_fsb);
} while (wpc->iomap.offset + wpc->iomap.length <= offset);
return 0;
}
@@ -519,7 +519,7 @@ xfs_map_blocks(
* against concurrent updates and provides a memory barrier on the way
* out that ensures that we always see the current value.
*/
if (xfs_imap_valid(wpc, ip, offset_fsb))
if (xfs_imap_valid(wpc, ip, offset))
return 0;
/*
@@ -552,7 +552,7 @@ retry:
* No COW extent overlap. Revalidate now that we may have updated
* ->cow_seq. If the data mapping is still valid, we're done.
*/
if (xfs_imap_valid(wpc, ip, offset_fsb)) {
if (xfs_imap_valid(wpc, ip, offset)) {
xfs_iunlock(ip, XFS_ILOCK_SHARED);
return 0;
}
@@ -592,11 +592,11 @@ retry:
isnullstartblock(imap.br_startblock))
goto allocate_blocks;
wpc->imap = imap;
xfs_bmbt_to_iomap(ip, &wpc->iomap, &imap, 0);
trace_xfs_map_blocks_found(ip, offset, count, wpc->fork, &imap);
return 0;
allocate_blocks:
error = xfs_convert_blocks(wpc, ip, offset_fsb);
error = xfs_convert_blocks(wpc, ip, offset);
if (error) {
/*
* If we failed to find the extent in the COW fork we might have
@@ -616,12 +616,15 @@ allocate_blocks:
* original delalloc one. Trim the return extent to the next COW
* boundary again to force a re-lookup.
*/
if (wpc->fork != XFS_COW_FORK && cow_fsb != NULLFILEOFF &&
cow_fsb < wpc->imap.br_startoff + wpc->imap.br_blockcount)
wpc->imap.br_blockcount = cow_fsb - wpc->imap.br_startoff;
if (wpc->fork != XFS_COW_FORK && cow_fsb != NULLFILEOFF) {
loff_t cow_offset = XFS_FSB_TO_B(mp, cow_fsb);
ASSERT(wpc->imap.br_startoff <= offset_fsb);
ASSERT(wpc->imap.br_startoff + wpc->imap.br_blockcount > offset_fsb);
if (cow_offset < wpc->iomap.offset + wpc->iomap.length)
wpc->iomap.length = cow_offset - wpc->iomap.offset;
}
ASSERT(wpc->iomap.offset <= offset);
ASSERT(wpc->iomap.offset + wpc->iomap.length > offset);
trace_xfs_map_blocks_alloc(ip, offset, count, wpc->fork, &imap);
return 0;
}
@@ -664,7 +667,7 @@ xfs_submit_ioend(
/* Reserve log space if we might write beyond the on-disk inode size. */
if (!status &&
(ioend->io_fork == XFS_COW_FORK ||
ioend->io_state != XFS_EXT_UNWRITTEN) &&
ioend->io_type != IOMAP_UNWRITTEN) &&
xfs_ioend_is_append(ioend) &&
!ioend->io_append_trans)
status = xfs_setfilesize_trans_alloc(ioend);
@@ -693,10 +696,8 @@ xfs_submit_ioend(
static struct xfs_ioend *
xfs_alloc_ioend(
struct inode *inode,
int fork,
xfs_exntst_t state,
struct xfs_writepage_ctx *wpc,
xfs_off_t offset,
struct block_device *bdev,
sector_t sector,
struct writeback_control *wbc)
{
@@ -704,7 +705,7 @@ xfs_alloc_ioend(
struct bio *bio;
bio = bio_alloc_bioset(GFP_NOFS, BIO_MAX_PAGES, &xfs_ioend_bioset);
bio_set_dev(bio, bdev);
bio_set_dev(bio, wpc->iomap.bdev);
bio->bi_iter.bi_sector = sector;
bio->bi_opf = REQ_OP_WRITE | wbc_to_write_flags(wbc);
bio->bi_write_hint = inode->i_write_hint;
@@ -712,8 +713,8 @@ xfs_alloc_ioend(
ioend = container_of(bio, struct xfs_ioend, io_inline_bio);
INIT_LIST_HEAD(&ioend->io_list);
ioend->io_fork = fork;
ioend->io_state = state;
ioend->io_fork = wpc->fork;
ioend->io_type = wpc->iomap.type;
ioend->io_inode = inode;
ioend->io_size = 0;
ioend->io_offset = offset;
@@ -761,26 +762,19 @@ xfs_add_to_ioend(
struct writeback_control *wbc,
struct list_head *iolist)
{
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
struct block_device *bdev = xfs_find_bdev_for_inode(inode);
sector_t sector = iomap_sector(&wpc->iomap, offset);
unsigned len = i_blocksize(inode);
unsigned poff = offset & (PAGE_SIZE - 1);
bool merged, same_page = false;
sector_t sector;
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->fork != wpc->ioend->io_fork ||
wpc->imap.br_state != wpc->ioend->io_state ||
wpc->iomap.type != wpc->ioend->io_type ||
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->fork,
wpc->imap.br_state, offset, bdev, sector, wbc);
wpc->ioend = xfs_alloc_ioend(inode, wpc, offset, sector, wbc);
}
merged = __bio_try_merge_page(wpc->ioend->io_bio, page, len, poff,
@@ -894,7 +888,7 @@ xfs_writepage_map(
error = xfs_map_blocks(wpc, inode, file_offset);
if (error)
break;
if (wpc->imap.br_startblock == HOLESTARTBLOCK)
if (wpc->iomap.type == IOMAP_HOLE)
continue;
xfs_add_to_ioend(inode, file_offset, page, iop, wpc, wbc,
&submit_list);