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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2020-09-21 18:58:41 +0300 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2020-09-21 18:59:26 +0300 |
| commit | 0fb2d7209d66a84d58d9337ffe9f609fd552b07b (patch) | |
| tree | 7d500de847f9327ddbd63c169c938a0095266198 | |
| parent | 7d636676d2841ba5d92462dfa99a89c2f2da8919 (diff) | |
| download | linux-0fb2d7209d66a84d58d9337ffe9f609fd552b07b.tar.xz | |
iomap: Convert write_count to write_bytes_pending
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) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
| -rw-r--r-- | fs/iomap/buffered-io.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 46370cea30c8..fdcdf1704e38 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -27,7 +27,7 @@ */ struct iomap_page { atomic_t read_bytes_pending; - atomic_t write_count; + atomic_t write_bytes_pending; spinlock_t uptodate_lock; unsigned long uptodate[]; }; @@ -73,7 +73,7 @@ iomap_page_release(struct page *page) if (!iop) return; WARN_ON_ONCE(atomic_read(&iop->read_bytes_pending)); - WARN_ON_ONCE(atomic_read(&iop->write_count)); + WARN_ON_ONCE(atomic_read(&iop->write_bytes_pending)); WARN_ON_ONCE(bitmap_full(iop->uptodate, nr_blocks) != PageUptodate(page)); kfree(iop); @@ -1047,7 +1047,7 @@ 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); @@ -1057,9 +1057,9 @@ 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); + WARN_ON_ONCE(iop && atomic_read(&iop->write_bytes_pending) <= 0); - if (!iop || atomic_dec_and_test(&iop->write_count)) + if (!iop || atomic_sub_and_test(len, &iop->write_bytes_pending)) end_page_writeback(page); } @@ -1093,7 +1093,8 @@ 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() */ @@ -1309,8 +1310,8 @@ 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_bytes_pending); if (!merged) { if (bio_full(wpc->ioend->io_bio, len)) { @@ -1353,7 +1354,7 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc, LIST_HEAD(submit_list); WARN_ON_ONCE(i_blocks_per_page(inode, page) > 1 && !iop); - WARN_ON_ONCE(iop && atomic_read(&iop->write_count) != 0); + WARN_ON_ONCE(iop && atomic_read(&iop->write_bytes_pending) != 0); /* * Walk through the page to find areas to write back. If we run off the |