diff options
author | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-06 09:01:25 -0800 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-06 09:01:25 -0800 |
commit | d99cf9d679a520d67f81d805b7cb91c68e1847f0 (patch) | |
tree | 415aefe6d168df27c006fcc53b1ea5242eabaaea /fs/bio.c | |
parent | 7ed40918a386afc2e14a6d3da563ea6d13686c25 (diff) | |
parent | e650c305ec3178818b317dad37a6d9c7fa8ba28d (diff) |
Merge branch 'post-2.6.15' of git://brick.kernel.dk/data/git/linux-2.6-block
Manual fixup for merge with Jens' "Suspend support for libata", commit
ID 9b847548663ef1039dd49f0eb4463d001e596bc3.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/bio.c')
-rw-r--r-- | fs/bio.c | 26 |
1 files changed, 24 insertions, 2 deletions
@@ -325,10 +325,31 @@ static int __bio_add_page(request_queue_t *q, struct bio *bio, struct page if (unlikely(bio_flagged(bio, BIO_CLONED))) return 0; - if (bio->bi_vcnt >= bio->bi_max_vecs) + if (((bio->bi_size + len) >> 9) > max_sectors) return 0; - if (((bio->bi_size + len) >> 9) > max_sectors) + /* + * For filesystems with a blocksize smaller than the pagesize + * we will often be called with the same page as last time and + * a consecutive offset. Optimize this special case. + */ + if (bio->bi_vcnt > 0) { + struct bio_vec *prev = &bio->bi_io_vec[bio->bi_vcnt - 1]; + + if (page == prev->bv_page && + offset == prev->bv_offset + prev->bv_len) { + prev->bv_len += len; + if (q->merge_bvec_fn && + q->merge_bvec_fn(q, bio, prev) < len) { + prev->bv_len -= len; + return 0; + } + + goto done; + } + } + + if (bio->bi_vcnt >= bio->bi_max_vecs) return 0; /* @@ -382,6 +403,7 @@ static int __bio_add_page(request_queue_t *q, struct bio *bio, struct page bio->bi_vcnt++; bio->bi_phys_segments++; bio->bi_hw_segments++; + done: bio->bi_size += len; return len; } |