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iomap: simplify iomap_readpage_actor

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Now that the outstanding reads are counted in bytes, there is no need
to use the low-level __bio_try_merge_page API, we can switch back to
always using bio_add_page and simplify iomap_readpage_actor again.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Christoph Hellwig 2021-08-02 14:43:43 -07:00 committed by Darrick J. Wong
parent c500bee1c5
commit d0364f9490
1 changed files with 4 additions and 12 deletions
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16
fs/iomap/buffered-io.c
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@ -241,7 +241,6 @@ iomap_readpage_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
struct iomap_readpage_ctx *ctx = data;
struct page *page = ctx->cur_page;
struct iomap_page *iop;
bool same_page = false, is_contig = false;
loff_t orig_pos = pos;
unsigned poff, plen;
sector_t sector;
@ -268,16 +267,10 @@ iomap_readpage_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
if (iop)
atomic_add(plen, &iop->read_bytes_pending);
/* Try to merge into a previous segment if we can */
sector = iomap_sector(iomap, pos);
if (ctx->bio && bio_end_sector(ctx->bio) == sector) {
if (__bio_try_merge_page(ctx->bio, page, plen, poff,
&same_page))
goto done;
is_contig = true;
}
if (!is_contig || bio_full(ctx->bio, plen)) {
if (!ctx->bio ||
bio_end_sector(ctx->bio) != sector ||
bio_add_page(ctx->bio, page, plen, poff) != plen) {
gfp_t gfp = mapping_gfp_constraint(page->mapping, GFP_KERNEL);
gfp_t orig_gfp = gfp;
unsigned int nr_vecs = DIV_ROUND_UP(length, PAGE_SIZE);
@ -301,9 +294,8 @@ iomap_readpage_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
ctx->bio->bi_iter.bi_sector = sector;
bio_set_dev(ctx->bio, iomap->bdev);
ctx->bio->bi_end_io = iomap_read_end_io;
__bio_add_page(ctx->bio, page, plen, poff);
}
bio_add_page(ctx->bio, page, plen, poff);
done:
/*
* Move the caller beyond our range so that it keeps making progress.