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authorLinus Torvalds <torvalds@linux-foundation.org>2012-10-11 09:04:23 +0900
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-11 09:04:23 +0900
commitce40be7a820bb393ac4ac69865f018d2f4038cf0 (patch)
treeb1fe5a93346eb06f22b1c303d63ec5456d7212ab /drivers/md/dm.c
parentba0a5a36f60e4c1152af3a2ae2813251974405bf (diff)
parent02f3939e1a9357b7c370a4a69717cf9c02452737 (diff)
Merge branch 'for-3.7/core' of git://git.kernel.dk/linux-block
Pull block IO update from Jens Axboe: "Core block IO bits for 3.7. Not a huge round this time, it contains: - First series from Kent cleaning up and generalizing bio allocation and freeing. - WRITE_SAME support from Martin. - Mikulas patches to prevent O_DIRECT crashes when someone changes the block size of a device. - Make bio_split() work on data-less bio's (like trim/discards). - A few other minor fixups." Fixed up silent semantic mis-merge as per Mikulas Patocka and Andrew Morton. It is due to the VM no longer using a prio-tree (see commit 6b2dbba8b6ac: "mm: replace vma prio_tree with an interval tree"). So make set_blocksize() use mapping_mapped() instead of open-coding the internal VM knowledge that has changed. * 'for-3.7/core' of git://git.kernel.dk/linux-block: (26 commits) block: makes bio_split support bio without data scatterlist: refactor the sg_nents scatterlist: add sg_nents fs: fix include/percpu-rwsem.h export error percpu-rw-semaphore: fix documentation typos fs/block_dev.c:1644:5: sparse: symbol 'blkdev_mmap' was not declared blockdev: turn a rw semaphore into a percpu rw semaphore Fix a crash when block device is read and block size is changed at the same time block: fix request_queue->flags initialization block: lift the initial queue bypass mode on blk_register_queue() instead of blk_init_allocated_queue() block: ioctl to zero block ranges block: Make blkdev_issue_zeroout use WRITE SAME block: Implement support for WRITE SAME block: Consolidate command flag and queue limit checks for merges block: Clean up special command handling logic block/blk-tag.c: Remove useless kfree block: remove the duplicated setting for congestion_threshold block: reject invalid queue attribute values block: Add bio_clone_bioset(), bio_clone_kmalloc() block: Consolidate bio_alloc_bioset(), bio_kmalloc() ...
Diffstat (limited to 'drivers/md/dm.c')
-rw-r--r--drivers/md/dm.c74
1 files changed, 22 insertions, 52 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 67ffa391edcf..66ceaff6455c 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -86,12 +86,17 @@ struct dm_rq_target_io {
};
/*
- * For request-based dm.
- * One of these is allocated per bio.
+ * For request-based dm - the bio clones we allocate are embedded in these
+ * structs.
+ *
+ * We allocate these with bio_alloc_bioset, using the front_pad parameter when
+ * the bioset is created - this means the bio has to come at the end of the
+ * struct.
*/
struct dm_rq_clone_bio_info {
struct bio *orig;
struct dm_rq_target_io *tio;
+ struct bio clone;
};
union map_info *dm_get_mapinfo(struct bio *bio)
@@ -211,6 +216,11 @@ struct dm_md_mempools {
static struct kmem_cache *_io_cache;
static struct kmem_cache *_tio_cache;
static struct kmem_cache *_rq_tio_cache;
+
+/*
+ * Unused now, and needs to be deleted. But since io_pool is overloaded and it's
+ * still used for _io_cache, I'm leaving this for a later cleanup
+ */
static struct kmem_cache *_rq_bio_info_cache;
static int __init local_init(void)
@@ -467,16 +477,6 @@ static void free_rq_tio(struct dm_rq_target_io *tio)
mempool_free(tio, tio->md->tio_pool);
}
-static struct dm_rq_clone_bio_info *alloc_bio_info(struct mapped_device *md)
-{
- return mempool_alloc(md->io_pool, GFP_ATOMIC);
-}
-
-static void free_bio_info(struct dm_rq_clone_bio_info *info)
-{
- mempool_free(info, info->tio->md->io_pool);
-}
-
static int md_in_flight(struct mapped_device *md)
{
return atomic_read(&md->pending[READ]) +
@@ -681,11 +681,6 @@ static void clone_endio(struct bio *bio, int error)
}
}
- /*
- * Store md for cleanup instead of tio which is about to get freed.
- */
- bio->bi_private = md->bs;
-
free_tio(md, tio);
bio_put(bio);
dec_pending(io, error);
@@ -1036,11 +1031,6 @@ static void __map_bio(struct dm_target *ti, struct bio *clone,
/* error the io and bail out, or requeue it if needed */
md = tio->io->md;
dec_pending(tio->io, r);
- /*
- * Store bio_set for cleanup.
- */
- clone->bi_end_io = NULL;
- clone->bi_private = md->bs;
bio_put(clone);
free_tio(md, tio);
} else if (r) {
@@ -1059,13 +1049,6 @@ struct clone_info {
unsigned short idx;
};
-static void dm_bio_destructor(struct bio *bio)
-{
- struct bio_set *bs = bio->bi_private;
-
- bio_free(bio, bs);
-}
-
/*
* Creates a little bio that just does part of a bvec.
*/
@@ -1077,7 +1060,6 @@ static struct bio *split_bvec(struct bio *bio, sector_t sector,
struct bio_vec *bv = bio->bi_io_vec + idx;
clone = bio_alloc_bioset(GFP_NOIO, 1, bs);
- clone->bi_destructor = dm_bio_destructor;
*clone->bi_io_vec = *bv;
clone->bi_sector = sector;
@@ -1090,7 +1072,7 @@ static struct bio *split_bvec(struct bio *bio, sector_t sector,
clone->bi_flags |= 1 << BIO_CLONED;
if (bio_integrity(bio)) {
- bio_integrity_clone(clone, bio, GFP_NOIO, bs);
+ bio_integrity_clone(clone, bio, GFP_NOIO);
bio_integrity_trim(clone,
bio_sector_offset(bio, idx, offset), len);
}
@@ -1109,7 +1091,6 @@ static struct bio *clone_bio(struct bio *bio, sector_t sector,
clone = bio_alloc_bioset(GFP_NOIO, bio->bi_max_vecs, bs);
__bio_clone(clone, bio);
- clone->bi_destructor = dm_bio_destructor;
clone->bi_sector = sector;
clone->bi_idx = idx;
clone->bi_vcnt = idx + bv_count;
@@ -1117,7 +1098,7 @@ static struct bio *clone_bio(struct bio *bio, sector_t sector,
clone->bi_flags &= ~(1 << BIO_SEG_VALID);
if (bio_integrity(bio)) {
- bio_integrity_clone(clone, bio, GFP_NOIO, bs);
+ bio_integrity_clone(clone, bio, GFP_NOIO);
if (idx != bio->bi_idx || clone->bi_size < bio->bi_size)
bio_integrity_trim(clone,
@@ -1152,9 +1133,8 @@ static void __issue_target_request(struct clone_info *ci, struct dm_target *ti,
* ci->bio->bi_max_vecs is BIO_INLINE_VECS anyway, for both flush
* and discard, so no need for concern about wasted bvec allocations.
*/
- clone = bio_alloc_bioset(GFP_NOIO, ci->bio->bi_max_vecs, ci->md->bs);
- __bio_clone(clone, ci->bio);
- clone->bi_destructor = dm_bio_destructor;
+ clone = bio_clone_bioset(ci->bio, GFP_NOIO, ci->md->bs);
+
if (len) {
clone->bi_sector = ci->sector;
clone->bi_size = to_bytes(len);
@@ -1484,30 +1464,17 @@ void dm_dispatch_request(struct request *rq)
}
EXPORT_SYMBOL_GPL(dm_dispatch_request);
-static void dm_rq_bio_destructor(struct bio *bio)
-{
- struct dm_rq_clone_bio_info *info = bio->bi_private;
- struct mapped_device *md = info->tio->md;
-
- free_bio_info(info);
- bio_free(bio, md->bs);
-}
-
static int dm_rq_bio_constructor(struct bio *bio, struct bio *bio_orig,
void *data)
{
struct dm_rq_target_io *tio = data;
- struct mapped_device *md = tio->md;
- struct dm_rq_clone_bio_info *info = alloc_bio_info(md);
-
- if (!info)
- return -ENOMEM;
+ struct dm_rq_clone_bio_info *info =
+ container_of(bio, struct dm_rq_clone_bio_info, clone);
info->orig = bio_orig;
info->tio = tio;
bio->bi_end_io = end_clone_bio;
bio->bi_private = info;
- bio->bi_destructor = dm_rq_bio_destructor;
return 0;
}
@@ -2771,7 +2738,10 @@ struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity)
if (!pools->tio_pool)
goto free_io_pool_and_out;
- pools->bs = bioset_create(pool_size, 0);
+ pools->bs = (type == DM_TYPE_BIO_BASED) ?
+ bioset_create(pool_size, 0) :
+ bioset_create(pool_size,
+ offsetof(struct dm_rq_clone_bio_info, clone));
if (!pools->bs)
goto free_tio_pool_and_out;