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-rw-r--r--block/bio.c52
1 files changed, 23 insertions, 29 deletions
diff --git a/block/bio.c b/block/bio.c
index fb12df9..0ec61c9 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -744,7 +744,6 @@ static int __bio_add_page(struct request_queue *q, struct bio *bio, struct page
}
}
- bio->bi_iter.bi_size += len;
goto done;
}
@@ -761,32 +760,29 @@ static int __bio_add_page(struct request_queue *q, struct bio *bio, struct page
return 0;
/*
- * setup the new entry, we might clear it again later if we
- * cannot add the page
- */
- bvec = &bio->bi_io_vec[bio->bi_vcnt];
- bvec->bv_page = page;
- bvec->bv_len = len;
- bvec->bv_offset = offset;
- bio->bi_vcnt++;
- bio->bi_phys_segments++;
- bio->bi_iter.bi_size += len;
-
- /*
- * Perform a recount if the number of segments is greater
- * than queue_max_segments(q).
+ * we might lose a segment or two here, but rather that than
+ * make this too complex.
*/
- while (bio->bi_phys_segments > queue_max_segments(q)) {
+ while (bio->bi_phys_segments >= queue_max_segments(q)) {
if (retried_segments)
- goto failed;
+ return 0;
retried_segments = 1;
blk_recount_segments(q, bio);
}
/*
+ * setup the new entry, we might clear it again later if we
+ * cannot add the page
+ */
+ bvec = &bio->bi_io_vec[bio->bi_vcnt];
+ bvec->bv_page = page;
+ bvec->bv_len = len;
+ bvec->bv_offset = offset;
+
+ /*
* if queue has other restrictions (eg varying max sector size
* depending on offset), it can specify a merge_bvec_fn in the
* queue to get further control
@@ -803,25 +799,23 @@ static int __bio_add_page(struct request_queue *q, struct bio *bio, struct page
* merge_bvec_fn() returns number of bytes it can accept
* at this offset
*/
- if (q->merge_bvec_fn(q, &bvm, bvec) < bvec->bv_len)
- goto failed;
+ if (q->merge_bvec_fn(q, &bvm, bvec) < bvec->bv_len) {
+ bvec->bv_page = NULL;
+ bvec->bv_len = 0;
+ bvec->bv_offset = 0;
+ return 0;
+ }
}
/* If we may be able to merge these biovecs, force a recount */
- if (bio->bi_vcnt > 1 && (BIOVEC_PHYS_MERGEABLE(bvec-1, bvec)))
+ if (bio->bi_vcnt && (BIOVEC_PHYS_MERGEABLE(bvec-1, bvec)))
bio->bi_flags &= ~(1 << BIO_SEG_VALID);
+ bio->bi_vcnt++;
+ bio->bi_phys_segments++;
done:
+ bio->bi_iter.bi_size += len;
return len;
-
- failed:
- bvec->bv_page = NULL;
- bvec->bv_len = 0;
- bvec->bv_offset = 0;
- bio->bi_vcnt--;
- bio->bi_iter.bi_size -= len;
- blk_recount_segments(q, bio);
- return 0;
}
/**
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