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author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2021-11-03 14:05:47 -0400 |
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committer | Matthew Wilcox (Oracle) <willy@infradead.org> | 2021-12-16 15:49:51 -0500 |
commit | d1bd0b4ebfe0521964e6937195bd2f76866660c7 (patch) | |
tree | e6c1401ff8a9455e31d7b922d580bc0439296c90 | |
parent | 640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662 (diff) | |
download | linux-stable-d1bd0b4ebfe0521964e6937195bd2f76866660c7.tar.gz linux-stable-d1bd0b4ebfe0521964e6937195bd2f76866660c7.tar.bz2 linux-stable-d1bd0b4ebfe0521964e6937195bd2f76866660c7.zip |
fs/buffer: Convert __block_write_begin_int() to take a folio
There are no plans to convert buffer_head infrastructure to use large
folios, but __block_write_begin_int() is called from iomap, and it's
more convenient and less error-prone if we pass in a folio from iomap.
It also has a nice saving of almost 200 bytes of code from removing
repeated calls to compound_head().
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
-rw-r--r-- | fs/buffer.c | 23 | ||||
-rw-r--r-- | fs/internal.h | 2 | ||||
-rw-r--r-- | fs/iomap/buffered-io.c | 7 |
3 files changed, 18 insertions, 14 deletions
diff --git a/fs/buffer.c b/fs/buffer.c index 46bc589b7a03..8e112b6bd371 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -1969,34 +1969,34 @@ iomap_to_bh(struct inode *inode, sector_t block, struct buffer_head *bh, } } -int __block_write_begin_int(struct page *page, loff_t pos, unsigned len, +int __block_write_begin_int(struct folio *folio, loff_t pos, unsigned len, get_block_t *get_block, const struct iomap *iomap) { unsigned from = pos & (PAGE_SIZE - 1); unsigned to = from + len; - struct inode *inode = page->mapping->host; + struct inode *inode = folio->mapping->host; unsigned block_start, block_end; sector_t block; int err = 0; unsigned blocksize, bbits; struct buffer_head *bh, *head, *wait[2], **wait_bh=wait; - BUG_ON(!PageLocked(page)); + BUG_ON(!folio_test_locked(folio)); BUG_ON(from > PAGE_SIZE); BUG_ON(to > PAGE_SIZE); BUG_ON(from > to); - head = create_page_buffers(page, inode, 0); + head = create_page_buffers(&folio->page, inode, 0); blocksize = head->b_size; bbits = block_size_bits(blocksize); - block = (sector_t)page->index << (PAGE_SHIFT - bbits); + block = (sector_t)folio->index << (PAGE_SHIFT - bbits); for(bh = head, block_start = 0; bh != head || !block_start; block++, block_start=block_end, bh = bh->b_this_page) { block_end = block_start + blocksize; if (block_end <= from || block_start >= to) { - if (PageUptodate(page)) { + if (folio_test_uptodate(folio)) { if (!buffer_uptodate(bh)) set_buffer_uptodate(bh); } @@ -2016,20 +2016,20 @@ int __block_write_begin_int(struct page *page, loff_t pos, unsigned len, if (buffer_new(bh)) { clean_bdev_bh_alias(bh); - if (PageUptodate(page)) { + if (folio_test_uptodate(folio)) { clear_buffer_new(bh); set_buffer_uptodate(bh); mark_buffer_dirty(bh); continue; } if (block_end > to || block_start < from) - zero_user_segments(page, + folio_zero_segments(folio, to, block_end, block_start, from); continue; } } - if (PageUptodate(page)) { + if (folio_test_uptodate(folio)) { if (!buffer_uptodate(bh)) set_buffer_uptodate(bh); continue; @@ -2050,14 +2050,15 @@ int __block_write_begin_int(struct page *page, loff_t pos, unsigned len, err = -EIO; } if (unlikely(err)) - page_zero_new_buffers(page, from, to); + page_zero_new_buffers(&folio->page, from, to); return err; } int __block_write_begin(struct page *page, loff_t pos, unsigned len, get_block_t *get_block) { - return __block_write_begin_int(page, pos, len, get_block, NULL); + return __block_write_begin_int(page_folio(page), pos, len, get_block, + NULL); } EXPORT_SYMBOL(__block_write_begin); diff --git a/fs/internal.h b/fs/internal.h index 7979ff8d168c..8590c973c2f4 100644 --- a/fs/internal.h +++ b/fs/internal.h @@ -37,7 +37,7 @@ static inline int emergency_thaw_bdev(struct super_block *sb) /* * buffer.c */ -int __block_write_begin_int(struct page *page, loff_t pos, unsigned len, +int __block_write_begin_int(struct folio *folio, loff_t pos, unsigned len, get_block_t *get_block, const struct iomap *iomap); /* diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 71a36ae120ee..ecb65167715b 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -603,6 +603,7 @@ static int iomap_write_begin(const struct iomap_iter *iter, loff_t pos, const struct iomap_page_ops *page_ops = iter->iomap.page_ops; const struct iomap *srcmap = iomap_iter_srcmap(iter); struct page *page; + struct folio *folio; int status = 0; BUG_ON(pos + len > iter->iomap.offset + iter->iomap.length); @@ -624,11 +625,12 @@ static int iomap_write_begin(const struct iomap_iter *iter, loff_t pos, status = -ENOMEM; goto out_no_page; } + folio = page_folio(page); if (srcmap->type == IOMAP_INLINE) status = iomap_write_begin_inline(iter, page); else if (srcmap->flags & IOMAP_F_BUFFER_HEAD) - status = __block_write_begin_int(page, pos, len, NULL, srcmap); + status = __block_write_begin_int(folio, pos, len, NULL, srcmap); else status = __iomap_write_begin(iter, pos, len, page); @@ -960,11 +962,12 @@ EXPORT_SYMBOL_GPL(iomap_truncate_page); static loff_t iomap_page_mkwrite_iter(struct iomap_iter *iter, struct page *page) { + struct folio *folio = page_folio(page); loff_t length = iomap_length(iter); int ret; if (iter->iomap.flags & IOMAP_F_BUFFER_HEAD) { - ret = __block_write_begin_int(page, iter->pos, length, NULL, + ret = __block_write_begin_int(folio, iter->pos, length, NULL, &iter->iomap); if (ret) return ret; |