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author | Olaf Kirch <olaf.kirch@oracle.com> | 2007-05-09 02:32:54 -0700 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-09 12:30:46 -0700 |
commit | f97380bcadd6bd2e368727de4061aaba4989c426 (patch) | |
tree | 179db9e733545aa1e796a22f670fc86963059492 /drivers | |
parent | 2f9941b6c55d70103c1bc3f2c7676acd9f20bf8a (diff) | |
download | linux-f97380bcadd6bd2e368727de4061aaba4989c426.tar.gz linux-f97380bcadd6bd2e368727de4061aaba4989c426.tar.bz2 linux-f97380bcadd6bd2e368727de4061aaba4989c426.zip |
dm crypt: use smaller bvecs in clones
Allocate smaller clones
With the previous dm-crypt fixes, there is no need for the clone bios to have
the same bvec size as the original - we just need to make them big enough for
the remaining number of pages. The only requirement is that we clear the
"out" index in convert_context, so that crypt_convert starts storing data at
the right position within the clone bio.
Signed-off-by: Olaf Kirch <olaf.kirch@oracle.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/md/dm-crypt.c | 29 |
1 files changed, 8 insertions, 21 deletions
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index 339b575ce07f..1ecee5e1c548 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -379,8 +379,7 @@ static int crypt_convert(struct crypt_config *cc, * This should never violate the device limitations * May return a smaller bio when running out of pages */ -static struct bio *crypt_alloc_buffer(struct crypt_io *io, unsigned int size, - unsigned int *bio_vec_idx) +static struct bio *crypt_alloc_buffer(struct crypt_io *io, unsigned int size) { struct crypt_config *cc = io->target->private; struct bio *clone; @@ -394,16 +393,7 @@ static struct bio *crypt_alloc_buffer(struct crypt_io *io, unsigned int size, clone_init(io, clone); - /* if the last bio was not complete, continue where that one ended */ - clone->bi_idx = *bio_vec_idx; - clone->bi_vcnt = *bio_vec_idx; - clone->bi_size = 0; - clone->bi_flags &= ~(1 << BIO_SEG_VALID); - - /* clone->bi_idx pages have already been allocated */ - size -= clone->bi_idx * PAGE_SIZE; - - for (i = clone->bi_idx; i < nr_iovecs; i++) { + for (i = 0; i < nr_iovecs; i++) { struct bio_vec *bv = bio_iovec_idx(clone, i); bv->bv_page = mempool_alloc(cc->page_pool, gfp_mask); @@ -415,7 +405,7 @@ static struct bio *crypt_alloc_buffer(struct crypt_io *io, unsigned int size, * return a partially allocated bio, the caller will then try * to allocate additional bios while submitting this partial bio */ - if ((i - clone->bi_idx) == (MIN_BIO_PAGES - 1)) + if (i == (MIN_BIO_PAGES - 1)) gfp_mask = (gfp_mask | __GFP_NOWARN) & ~__GFP_WAIT; bv->bv_offset = 0; @@ -434,12 +424,6 @@ static struct bio *crypt_alloc_buffer(struct crypt_io *io, unsigned int size, return NULL; } - /* - * Remember the last bio_vec allocated to be able - * to correctly continue after the splitting. - */ - *bio_vec_idx = clone->bi_vcnt; - return clone; } @@ -597,7 +581,6 @@ static void process_write(struct crypt_io *io) struct convert_context ctx; unsigned remaining = base_bio->bi_size; sector_t sector = base_bio->bi_sector - io->target->begin; - unsigned bvec_idx = 0; atomic_inc(&io->pending); @@ -608,13 +591,14 @@ static void process_write(struct crypt_io *io) * so repeat the whole process until all the data can be handled. */ while (remaining) { - clone = crypt_alloc_buffer(io, base_bio->bi_size, &bvec_idx); + clone = crypt_alloc_buffer(io, remaining); if (unlikely(!clone)) { dec_pending(io, -ENOMEM); return; } ctx.bio_out = clone; + ctx.idx_out = 0; if (unlikely(crypt_convert(cc, &ctx) < 0)) { crypt_free_buffer_pages(cc, clone, clone->bi_size); @@ -623,6 +607,9 @@ static void process_write(struct crypt_io *io) return; } + /* crypt_convert should have filled the clone bio */ + BUG_ON(ctx.idx_out < clone->bi_vcnt); + clone->bi_sector = cc->start + sector; remaining -= clone->bi_size; sector += bio_sectors(clone); |