diff options
Diffstat (limited to 'ANDROID_3.4.5/block/blk-lib.c')
| -rw-r--r-- | ANDROID_3.4.5/block/blk-lib.c | 178 |
1 files changed, 0 insertions, 178 deletions
diff --git a/ANDROID_3.4.5/block/blk-lib.c b/ANDROID_3.4.5/block/blk-lib.c deleted file mode 100644 index 2b461b49..00000000 --- a/ANDROID_3.4.5/block/blk-lib.c +++ /dev/null @@ -1,178 +0,0 @@ -/* - * Functions related to generic helpers functions - */ -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/bio.h> -#include <linux/blkdev.h> -#include <linux/scatterlist.h> - -#include "blk.h" - -struct bio_batch { - atomic_t done; - unsigned long flags; - struct completion *wait; -}; - -static void bio_batch_end_io(struct bio *bio, int err) -{ - struct bio_batch *bb = bio->bi_private; - - if (err && (err != -EOPNOTSUPP)) - clear_bit(BIO_UPTODATE, &bb->flags); - if (atomic_dec_and_test(&bb->done)) - complete(bb->wait); - bio_put(bio); -} - -/** - * blkdev_issue_discard - queue a discard - * @bdev: blockdev to issue discard for - * @sector: start sector - * @nr_sects: number of sectors to discard - * @gfp_mask: memory allocation flags (for bio_alloc) - * @flags: BLKDEV_IFL_* flags to control behaviour - * - * Description: - * Issue a discard request for the sectors in question. - */ -int blkdev_issue_discard(struct block_device *bdev, sector_t sector, - sector_t nr_sects, gfp_t gfp_mask, unsigned long flags) -{ - DECLARE_COMPLETION_ONSTACK(wait); - struct request_queue *q = bdev_get_queue(bdev); - int type = REQ_WRITE | REQ_DISCARD; - unsigned int max_discard_sectors; - struct bio_batch bb; - struct bio *bio; - int ret = 0; - - if (!q) - return -ENXIO; - - if (!blk_queue_discard(q)) - return -EOPNOTSUPP; - - /* - * Ensure that max_discard_sectors is of the proper - * granularity - */ - max_discard_sectors = min(q->limits.max_discard_sectors, UINT_MAX >> 9); - if (unlikely(!max_discard_sectors)) { - /* Avoid infinite loop below. Being cautious never hurts. */ - return -EOPNOTSUPP; - } else if (q->limits.discard_granularity) { - unsigned int disc_sects = q->limits.discard_granularity >> 9; - - max_discard_sectors &= ~(disc_sects - 1); - } - - if (flags & BLKDEV_DISCARD_SECURE) { - if (!blk_queue_secdiscard(q)) - return -EOPNOTSUPP; - type |= REQ_SECURE; - } - - atomic_set(&bb.done, 1); - bb.flags = 1 << BIO_UPTODATE; - bb.wait = &wait; - - while (nr_sects) { - bio = bio_alloc(gfp_mask, 1); - if (!bio) { - ret = -ENOMEM; - break; - } - - bio->bi_sector = sector; - bio->bi_end_io = bio_batch_end_io; - bio->bi_bdev = bdev; - bio->bi_private = &bb; - - 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; - } - - atomic_inc(&bb.done); - submit_bio(type, bio); - } - - /* Wait for bios in-flight */ - if (!atomic_dec_and_test(&bb.done)) - wait_for_completion(&wait); - - if (!test_bit(BIO_UPTODATE, &bb.flags)) - ret = -EIO; - - return ret; -} -EXPORT_SYMBOL(blkdev_issue_discard); - -/** - * blkdev_issue_zeroout - generate number of zero filed write bios - * @bdev: blockdev to issue - * @sector: start sector - * @nr_sects: number of sectors to write - * @gfp_mask: memory allocation flags (for bio_alloc) - * - * Description: - * Generate and issue number of bios with zerofiled pages. - */ - -int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, - sector_t nr_sects, gfp_t gfp_mask) -{ - int ret; - struct bio *bio; - struct bio_batch bb; - unsigned int sz; - DECLARE_COMPLETION_ONSTACK(wait); - - atomic_set(&bb.done, 1); - bb.flags = 1 << BIO_UPTODATE; - bb.wait = &wait; - - ret = 0; - while (nr_sects != 0) { - bio = bio_alloc(gfp_mask, - min(nr_sects, (sector_t)BIO_MAX_PAGES)); - if (!bio) { - ret = -ENOMEM; - break; - } - - bio->bi_sector = sector; - bio->bi_bdev = bdev; - bio->bi_end_io = bio_batch_end_io; - bio->bi_private = &bb; - - while (nr_sects != 0) { - sz = min((sector_t) PAGE_SIZE >> 9 , nr_sects); - ret = bio_add_page(bio, ZERO_PAGE(0), sz << 9, 0); - nr_sects -= ret >> 9; - sector += ret >> 9; - if (ret < (sz << 9)) - break; - } - ret = 0; - atomic_inc(&bb.done); - submit_bio(WRITE, bio); - } - - /* Wait for bios in-flight */ - if (!atomic_dec_and_test(&bb.done)) - wait_for_completion(&wait); - - if (!test_bit(BIO_UPTODATE, &bb.flags)) - /* One of bios in the batch was completed with error.*/ - ret = -EIO; - - return ret; -} -EXPORT_SYMBOL(blkdev_issue_zeroout); |