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block: Convert various code to bio_for_each_segment()

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With immutable biovecs we don't want code accessing bi_io_vec directly -
the uses this patch changes weren't incorrect since they all own the
bio, but it makes the code harder to audit for no good reason - also,
this will help with multipage bvecs later.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Chris Mason <chris.mason@fusionio.com>
Cc: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Cc: Joern Engel <joern@logfs.org>
Cc: Prasad Joshi <prasadjoshi.linux@gmail.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Kent Overstreet
2013-11-07 12:20:26 -08:00
parent 33879d4512
commit 2c30c71bd6
10 changed files with 66 additions and 101 deletions
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35
fs/btrfs/extent_io.c
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@ -2332,12 +2332,13 @@ int end_extent_writepage(struct page *page, int err, u64 start, u64 end)
*/
static void end_bio_extent_writepage(struct bio *bio, int err)
{
struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
struct bio_vec *bvec;
struct extent_io_tree *tree;
u64 start;
u64 end;
int i;
do {
bio_for_each_segment_all(bvec, bio, i) {
struct page *page = bvec->bv_page;
tree = &BTRFS_I(page->mapping->host)->io_tree;
@ -2355,14 +2356,11 @@ static void end_bio_extent_writepage(struct bio *bio, int err)
start = page_offset(page);
end = start + bvec->bv_offset + bvec->bv_len - 1;
if (--bvec >= bio->bi_io_vec)
prefetchw(&bvec->bv_page->flags);
if (end_extent_writepage(page, err, start, end))
continue;
end_page_writeback(page);
} while (bvec >= bio->bi_io_vec);
}
bio_put(bio);
}
@ -2392,9 +2390,8 @@ endio_readpage_release_extent(struct extent_io_tree *tree, u64 start, u64 len,
*/
static void end_bio_extent_readpage(struct bio *bio, int err)
{
struct bio_vec *bvec;
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
struct bio_vec *bvec_end = bio->bi_io_vec + bio->bi_vcnt - 1;
struct bio_vec *bvec = bio->bi_io_vec;
struct btrfs_io_bio *io_bio = btrfs_io_bio(bio);
struct extent_io_tree *tree;
u64 offset = 0;
@ -2405,11 +2402,12 @@ static void end_bio_extent_readpage(struct bio *bio, int err)
u64 extent_len = 0;
int mirror;
int ret;
int i;
if (err)
uptodate = 0;
do {
bio_for_each_segment_all(bvec, bio, i) {
struct page *page = bvec->bv_page;
struct inode *inode = page->mapping->host;
@ -2433,9 +2431,6 @@ static void end_bio_extent_readpage(struct bio *bio, int err)
end = start + bvec->bv_offset + bvec->bv_len - 1;
len = bvec->bv_len;
if (++bvec <= bvec_end)
prefetchw(&bvec->bv_page->flags);
mirror = io_bio->mirror_num;
if (likely(uptodate && tree->ops &&
tree->ops->readpage_end_io_hook)) {
@ -2516,7 +2511,7 @@ readpage_ok:
extent_start = start;
extent_len = end + 1 - start;
}
} while (bvec <= bvec_end);
}
if (extent_len)
endio_readpage_release_extent(tree, extent_start, extent_len,
@ -2547,7 +2542,6 @@ btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
}
if (bio) {
bio->bi_size = 0;
bio->bi_bdev = bdev;
bio->bi_sector = first_sector;
btrfs_bio = btrfs_io_bio(bio);
@ -3410,20 +3404,18 @@ static void end_extent_buffer_writeback(struct extent_buffer *eb)
static void end_bio_extent_buffer_writepage(struct bio *bio, int err)
{
int uptodate = err == 0;
struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
struct bio_vec *bvec;
struct extent_buffer *eb;
int done;
int i, done;
do {
bio_for_each_segment_all(bvec, bio, i) {
struct page *page = bvec->bv_page;
bvec--;
eb = (struct extent_buffer *)page->private;
BUG_ON(!eb);
done = atomic_dec_and_test(&eb->io_pages);
if (!uptodate || test_bit(EXTENT_BUFFER_IOERR, &eb->bflags)) {
if (err || test_bit(EXTENT_BUFFER_IOERR, &eb->bflags)) {
set_bit(EXTENT_BUFFER_IOERR, &eb->bflags);
ClearPageUptodate(page);
SetPageError(page);
@ -3435,10 +3427,9 @@ static void end_bio_extent_buffer_writepage(struct bio *bio, int err)
continue;
end_extent_buffer_writeback(eb);
} while (bvec >= bio->bi_io_vec);
}
bio_put(bio);
}
static int write_one_eb(struct extent_buffer *eb,