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Message-Id: <20191001071152.24403-10-hch@lst.de>
Date: Tue, 1 Oct 2019 09:11:50 +0200
From: Christoph Hellwig <hch@....de>
To: "Darrick J . Wong" <darrick.wong@...cle.com>
Cc: Damien Le Moal <Damien.LeMoal@....com>,
Andreas Gruenbacher <agruenba@...hat.com>,
linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org,
Carlos Maiolino <cmaiolino@...hat.com>
Subject: [PATCH 09/11] xfs: remove the fork fields in the writepage_ctx and ioend
In preparation for moving the writeback code to iomap.c, replace the
XFS-specific COW fork concept with the iomap IOMAP_F_SHARED flag.
Signed-off-by: Christoph Hellwig <hch@....de>
Reviewed-by: Carlos Maiolino <cmaiolino@...hat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>
---
fs/xfs/xfs_aops.c | 42 ++++++++++++++++++++++--------------------
fs/xfs/xfs_aops.h | 2 +-
2 files changed, 23 insertions(+), 21 deletions(-)
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 9f22885902ef..8c101081e3b1 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -23,7 +23,6 @@
*/
struct xfs_writepage_ctx {
struct iomap iomap;
- int fork;
unsigned int data_seq;
unsigned int cow_seq;
struct xfs_ioend *ioend;
@@ -257,7 +256,7 @@ xfs_end_ioend(
*/
error = blk_status_to_errno(ioend->io_bio->bi_status);
if (unlikely(error)) {
- if (ioend->io_fork == XFS_COW_FORK)
+ if (ioend->io_flags & IOMAP_F_SHARED)
xfs_reflink_cancel_cow_range(ip, offset, size, true);
goto done;
}
@@ -265,7 +264,7 @@ xfs_end_ioend(
/*
* Success: commit the COW or unwritten blocks if needed.
*/
- if (ioend->io_fork == XFS_COW_FORK)
+ if (ioend->io_flags & IOMAP_F_SHARED)
error = xfs_reflink_end_cow(ip, offset, size);
else if (ioend->io_type == IOMAP_UNWRITTEN)
error = xfs_iomap_write_unwritten(ip, offset, size, false);
@@ -298,7 +297,8 @@ xfs_ioend_can_merge(
{
if (ioend->io_bio->bi_status != next->io_bio->bi_status)
return false;
- if ((ioend->io_fork == XFS_COW_FORK) ^ (next->io_fork == XFS_COW_FORK))
+ if ((ioend->io_flags & IOMAP_F_SHARED) ^
+ (next->io_flags & IOMAP_F_SHARED))
return false;
if ((ioend->io_type == IOMAP_UNWRITTEN) ^
(next->io_type == IOMAP_UNWRITTEN))
@@ -402,7 +402,7 @@ xfs_end_bio(
struct xfs_mount *mp = ip->i_mount;
unsigned long flags;
- if (ioend->io_fork == XFS_COW_FORK ||
+ if ((ioend->io_flags & IOMAP_F_SHARED) ||
ioend->io_type == IOMAP_UNWRITTEN ||
ioend->io_append_trans != NULL) {
spin_lock_irqsave(&ip->i_ioend_lock, flags);
@@ -433,7 +433,7 @@ 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->fork == XFS_COW_FORK)
+ if (wpc->iomap.flags & IOMAP_F_SHARED)
return true;
/*
@@ -463,6 +463,7 @@ static int
xfs_convert_blocks(
struct xfs_writepage_ctx *wpc,
struct xfs_inode *ip,
+ int whichfork,
loff_t offset)
{
int error;
@@ -474,8 +475,8 @@ xfs_convert_blocks(
* delalloc extent if free space is sufficiently fragmented.
*/
do {
- error = xfs_bmapi_convert_delalloc(ip, wpc->fork, offset,
- &wpc->iomap, wpc->fork == XFS_COW_FORK ?
+ error = xfs_bmapi_convert_delalloc(ip, whichfork, offset,
+ &wpc->iomap, whichfork == XFS_COW_FORK ?
&wpc->cow_seq : &wpc->data_seq);
if (error)
return error;
@@ -496,6 +497,7 @@ xfs_map_blocks(
xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, offset + count);
xfs_fileoff_t cow_fsb = NULLFILEOFF;
+ int whichfork = XFS_DATA_FORK;
struct xfs_bmbt_irec imap;
struct xfs_iext_cursor icur;
int retries = 0;
@@ -544,7 +546,7 @@ xfs_map_blocks(
wpc->cow_seq = READ_ONCE(ip->i_cowfp->if_seq);
xfs_iunlock(ip, XFS_ILOCK_SHARED);
- wpc->fork = XFS_COW_FORK;
+ whichfork = XFS_COW_FORK;
goto allocate_blocks;
}
@@ -567,8 +569,6 @@ xfs_map_blocks(
wpc->data_seq = READ_ONCE(ip->i_df.if_seq);
xfs_iunlock(ip, XFS_ILOCK_SHARED);
- wpc->fork = XFS_DATA_FORK;
-
/* landed in a hole or beyond EOF? */
if (imap.br_startoff > offset_fsb) {
imap.br_blockcount = imap.br_startoff - offset_fsb;
@@ -593,10 +593,10 @@ xfs_map_blocks(
goto allocate_blocks;
xfs_bmbt_to_iomap(ip, &wpc->iomap, &imap, 0);
- trace_xfs_map_blocks_found(ip, offset, count, wpc->fork, &imap);
+ trace_xfs_map_blocks_found(ip, offset, count, whichfork, &imap);
return 0;
allocate_blocks:
- error = xfs_convert_blocks(wpc, ip, offset);
+ error = xfs_convert_blocks(wpc, ip, whichfork, offset);
if (error) {
/*
* If we failed to find the extent in the COW fork we might have
@@ -605,7 +605,8 @@ xfs_map_blocks(
* the former case, but prevent additional retries to avoid
* looping forever for the latter case.
*/
- if (error == -EAGAIN && wpc->fork == XFS_COW_FORK && !retries++)
+ if (error == -EAGAIN && (wpc->iomap.flags & IOMAP_F_SHARED) &&
+ !retries++)
goto retry;
ASSERT(error != -EAGAIN);
return error;
@@ -616,7 +617,7 @@ xfs_map_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) {
+ if (!(wpc->iomap.flags & IOMAP_F_SHARED) && cow_fsb != NULLFILEOFF) {
loff_t cow_offset = XFS_FSB_TO_B(mp, cow_fsb);
if (cow_offset < wpc->iomap.offset + wpc->iomap.length)
@@ -625,7 +626,7 @@ xfs_map_blocks(
ASSERT(wpc->iomap.offset <= offset);
ASSERT(wpc->iomap.offset + wpc->iomap.length > offset);
- trace_xfs_map_blocks_alloc(ip, offset, count, wpc->fork, &imap);
+ trace_xfs_map_blocks_alloc(ip, offset, count, whichfork, &imap);
return 0;
}
@@ -659,14 +660,14 @@ xfs_submit_ioend(
nofs_flag = memalloc_nofs_save();
/* Convert CoW extents to regular */
- if (!status && ioend->io_fork == XFS_COW_FORK) {
+ if (!status && (ioend->io_flags & IOMAP_F_SHARED)) {
status = xfs_reflink_convert_cow(XFS_I(ioend->io_inode),
ioend->io_offset, ioend->io_size);
}
/* Reserve log space if we might write beyond the on-disk inode size. */
if (!status &&
- (ioend->io_fork == XFS_COW_FORK ||
+ ((ioend->io_flags & IOMAP_F_SHARED) ||
ioend->io_type != IOMAP_UNWRITTEN) &&
xfs_ioend_is_append(ioend) &&
!ioend->io_append_trans)
@@ -713,8 +714,8 @@ xfs_alloc_ioend(
ioend = container_of(bio, struct xfs_ioend, io_inline_bio);
INIT_LIST_HEAD(&ioend->io_list);
- ioend->io_fork = wpc->fork;
ioend->io_type = wpc->iomap.type;
+ ioend->io_flags = wpc->iomap.flags;
ioend->io_inode = inode;
ioend->io_size = 0;
ioend->io_offset = offset;
@@ -768,7 +769,8 @@ xfs_add_to_ioend(
bool merged, same_page = false;
if (!wpc->ioend ||
- wpc->fork != wpc->ioend->io_fork ||
+ (wpc->iomap.flags & IOMAP_F_SHARED) !=
+ (wpc->ioend->io_flags & IOMAP_F_SHARED) ||
wpc->iomap.type != wpc->ioend->io_type ||
sector != bio_end_sector(wpc->ioend->io_bio) ||
offset != wpc->ioend->io_offset + wpc->ioend->io_size) {
diff --git a/fs/xfs/xfs_aops.h b/fs/xfs/xfs_aops.h
index 4af8ec0115cd..c2756ed50b0d 100644
--- a/fs/xfs/xfs_aops.h
+++ b/fs/xfs/xfs_aops.h
@@ -13,8 +13,8 @@ extern struct bio_set xfs_ioend_bioset;
*/
struct xfs_ioend {
struct list_head io_list; /* next ioend in chain */
- int io_fork; /* inode fork written back */
u16 io_type;
+ u16 io_flags; /* IOMAP_F_* */
struct inode *io_inode; /* file being written to */
size_t io_size; /* size of the extent */
xfs_off_t io_offset; /* offset in the file */
--
2.20.1
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