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ext4: use sb_issue_zeroout in ext4_ext_zeroout

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Change ext4_ext_zeroout to use sb_issue_zeroout instead of its
own approach to zero out extents.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Lukas Czerner 2010-10-27 21:30:06 -04:00 committed by Theodore Ts'o
parent a31437b85a
commit 2407518de6
1 changed files with 7 additions and 62 deletions
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69
fs/ext4/extents.c
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@ -2535,77 +2535,22 @@ void ext4_ext_release(struct super_block *sb)
#endif
}
static void bi_complete(struct bio *bio, int error)
{
complete((struct completion *)bio->bi_private);
}
/* FIXME!! we need to try to merge to left or right after zero-out */
static int ext4_ext_zeroout(struct inode *inode, struct ext4_extent *ex)
{
ext4_fsblk_t ee_pblock;
unsigned int ee_len;
int ret;
struct bio *bio;
int blkbits, blocksize;
sector_t ee_pblock;
struct completion event;
unsigned int ee_len, len, done, offset;
blkbits = inode->i_blkbits;
blocksize = inode->i_sb->s_blocksize;
ee_len = ext4_ext_get_actual_len(ex);
ee_pblock = ext_pblock(ex);
/* convert ee_pblock to 512 byte sectors */
ee_pblock = ee_pblock << (blkbits - 9);
ret = sb_issue_zeroout(inode->i_sb, ee_pblock, ee_len,
GFP_NOFS, BLKDEV_IFL_WAIT);
if (ret > 0)
ret = 0;
while (ee_len > 0) {
if (ee_len > BIO_MAX_PAGES)
len = BIO_MAX_PAGES;
else
len = ee_len;
bio = bio_alloc(GFP_NOIO, len);
if (!bio)
return -ENOMEM;
bio->bi_sector = ee_pblock;
bio->bi_bdev = inode->i_sb->s_bdev;
done = 0;
offset = 0;
while (done < len) {
ret = bio_add_page(bio, ZERO_PAGE(0),
blocksize, offset);
if (ret != blocksize) {
/*
* We can't add any more pages because of
* hardware limitations. Start a new bio.
*/
break;
}
done++;
offset += blocksize;
if (offset >= PAGE_CACHE_SIZE)
offset = 0;
}
init_completion(&event);
bio->bi_private = &event;
bio->bi_end_io = bi_complete;
submit_bio(WRITE, bio);
wait_for_completion(&event);
if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) {
bio_put(bio);
return -EIO;
}
bio_put(bio);
ee_len -= done;
ee_pblock += done << (blkbits - 9);
}
return 0;
return ret;
}
#define EXT4_EXT_ZERO_LEN 7