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btrfs: Honour FITRIM range constraints during free space trim

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commit c2d1b3aae3 upstream.

Up until now trimming the freespace was done irrespective of what the
arguments of the FITRIM ioctl were. For example fstrim's -o/-l arguments
will be entirely ignored. Fix it by correctly handling those paramter.
This requires breaking if the found freespace extent is after the end of
the passed range as well as completing trim after trimming
fstrim_range::len bytes.

Fixes: 499f377f49 ("btrfs: iterate over unused chunk space in FITRIM")
CC: stable@vger.kernel.org # 4.4+
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nikolay Borisov
2019-03-25 14:31:21 +02:00
committed by Chris
parent 8e159fab7c
commit 54e05f8a29
1 changed files with 19 additions and 6 deletions
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25
fs/btrfs/extent-tree.c
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@@ -11150,9 +11150,9 @@ int btrfs_error_unpin_extent_range(struct btrfs_root *root, u64 start, u64 end)
* transaction.
*/
static int btrfs_trim_free_extents(struct btrfs_device *device,
u64 minlen, u64 *trimmed)
struct fstrim_range *range, u64 *trimmed)
{
u64 start = 0, len = 0;
u64 start = range->start, len = 0;
int ret;
*trimmed = 0;
@@ -11188,8 +11188,8 @@ static int btrfs_trim_free_extents(struct btrfs_device *device,
atomic_inc(&trans->use_count);
spin_unlock(&fs_info->trans_lock);
ret = find_free_dev_extent_start(trans, device, minlen, start,
&start, &len);
ret = find_free_dev_extent_start(trans, device, range->minlen,
start, &start, &len);
if (trans)
btrfs_put_transaction(trans);
@@ -11201,6 +11201,16 @@ static int btrfs_trim_free_extents(struct btrfs_device *device,
break;
}
/* If we are out of the passed range break */
if (start > range->start + range->len - 1) {
mutex_unlock(&fs_info->chunk_mutex);
ret = 0;
break;
}
start = max(range->start, start);
len = min(range->len, len);
ret = btrfs_issue_discard(device->bdev, start, len, &bytes);
up_read(&fs_info->commit_root_sem);
mutex_unlock(&fs_info->chunk_mutex);
@@ -11211,6 +11221,10 @@ static int btrfs_trim_free_extents(struct btrfs_device *device,
start += len;
*trimmed += bytes;
/* We've trimmed enough */
if (*trimmed >= range->len)
break;
if (fatal_signal_pending(current)) {
ret = -ERESTARTSYS;
break;
@@ -11295,8 +11309,7 @@ int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range)
mutex_lock(&fs_info->fs_devices->device_list_mutex);
devices = &fs_info->fs_devices->devices;
list_for_each_entry(device, devices, dev_list) {
ret = btrfs_trim_free_extents(device, range->minlen,
&group_trimmed);
ret = btrfs_trim_free_extents(device, range, &group_trimmed);
if (ret) {
dev_failed++;
dev_ret = ret;