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authorChristoph Hellwig <hch@infradead.org>2009-09-30 13:54:20 +0200
committerJens Axboe <jens.axboe@oracle.com>2009-10-01 21:19:34 +0200
commit67efc9258010da35b27b3854d0880c7e193004ed (patch)
treed98ad032d8c701084539d5673c2d7d7ca5962a3f /block/blk-barrier.c
parentc15227de132f1295f3db6b7df9079956b1020fd8 (diff)
block: allow large discard requests
Currently we set the bio size to the byte equivalent of the blocks to be trimmed when submitting the initial DISCARD ioctl. That means it is subject to the max_hw_sectors limitation of the HBA which is much lower than the size of a DISCARD request we can support. Add a separate max_discard_sectors tunable to limit the size for discard requests. We limit the max discard request size in bytes to 32bit as that is the limit for bio->bi_size. This could be much larger if we had a way to pass that information through the block layer. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk-barrier.c')
-rw-r--r--block/blk-barrier.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/block/blk-barrier.c b/block/blk-barrier.c
index 21f5025c3945..8873b9b439ff 100644
--- a/block/blk-barrier.c
+++ b/block/blk-barrier.c
@@ -385,6 +385,8 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
while (nr_sects && !ret) {
unsigned int sector_size = q->limits.logical_block_size;
+ unsigned int max_discard_sectors =
+ min(q->limits.max_discard_sectors, UINT_MAX >> 9);
bio = bio_alloc(gfp_mask, 1);
if (!bio)
@@ -411,10 +413,10 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
* touch many more blocks on disk than the actual payload
* length.
*/
- if (nr_sects > queue_max_hw_sectors(q)) {
- bio->bi_size = queue_max_hw_sectors(q) << 9;
- nr_sects -= queue_max_hw_sectors(q);
- sector += queue_max_hw_sectors(q);
+ if (nr_sects > max_discard_sectors) {
+ bio->bi_size = max_discard_sectors << 9;
+ nr_sects -= max_discard_sectors;
+ sector += max_discard_sectors;
} else {
bio->bi_size = nr_sects << 9;
nr_sects = 0;