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btrfs: make btrfs_issue_discard return bytes discarded 

Initially this will just be the length argument passed to it,
but the following patches will adjust that to reflect re-alignment
and skipped blocks.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Tested-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
steinar/wifi_calib_4_9_kernel
Jeff Mahoney 2015-06-15 09:41:14 -04:00 committed by Chris Mason
parent 00d80e342c
commit d04c6b8832
1 changed files with 14 additions and 5 deletions
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19
fs/btrfs/extent-tree.c
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@ -1883,10 +1883,17 @@ static int remove_extent_backref(struct btrfs_trans_handle *trans,
return ret;
}
static int btrfs_issue_discard(struct block_device *bdev,
u64 start, u64 len)
static int btrfs_issue_discard(struct block_device *bdev, u64 start, u64 len,
u64 *discarded_bytes)
{
return blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_NOFS, 0);
int ret = 0;
*discarded_bytes = 0;
ret = blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_NOFS, 0);
if (!ret)
*discarded_bytes = len;
return ret;
}
int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr,
@ -1907,14 +1914,16 @@ int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr,
for (i = 0; i < bbio->num_stripes; i++, stripe++) {
u64 bytes;
if (!stripe->dev->can_discard)
continue;
ret = btrfs_issue_discard(stripe->dev->bdev,
stripe->physical,
stripe->length);
stripe->length,
&bytes);
if (!ret)
discarded_bytes += stripe->length;
discarded_bytes += bytes;
else if (ret != -EOPNOTSUPP)
break; /* Logic errors or -ENOMEM, or -EIO but I don't know how that could happen JDM */