Instead of counting bio segments, count the number of bytes submitted.
This insulates us from the block layer's definition of what a 'same page'
is, which is not necessarily clear once THPs are involved.
Signed-off-by: Matthew Wilcox (Oracle) <wi...@infradead.org>
---
fs/iomap/buffered-io.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index c9b44f86d166..8c6187a6f34e 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -1050,7 +1050,7 @@ EXPORT_SYMBOL_GPL(iomap_page_mkwrite);
static void
iomap_finish_page_writeback(struct inode *inode, struct page *page,
- int error)
+ int error, unsigned int len)
{
struct iomap_page *iop = to_iomap_page(page);
@@ -1062,7 +1062,7 @@ iomap_finish_page_writeback(struct inode *inode, struct
page *page,
WARN_ON_ONCE(i_blocks_per_page(inode, page) > 1 && !iop);
WARN_ON_ONCE(iop && atomic_read(&iop->write_count) <= 0);
- if (!iop || atomic_dec_and_test(&iop->write_count))
+ if (!iop || atomic_sub_and_test(len, &iop->write_count))
end_page_writeback(page);
}
@@ -1096,7 +1096,8 @@ iomap_finish_ioend(struct iomap_ioend *ioend, int error)
/* walk each page on bio, ending page IO on them */
bio_for_each_segment_all(bv, bio, iter_all)
- iomap_finish_page_writeback(inode, bv->bv_page, error);
+ iomap_finish_page_writeback(inode, bv->bv_page, error,
+ bv->bv_len);
bio_put(bio);
}
/* The ioend has been freed by bio_put() */
@@ -1312,8 +1313,8 @@ iomap_add_to_ioend(struct inode *inode, loff_t offset,
struct page *page,
merged = __bio_try_merge_page(wpc->ioend->io_bio, page, len, poff,
&same_page);
- if (iop && !same_page)
- atomic_inc(&iop->write_count);
+ if (iop)
+ atomic_add(len, &iop->write_count);
if (!merged) {
if (bio_full(wpc->ioend->io_bio, len)) {
--
2.28.0
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