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authorNikolay Borisov <nborisov@suse.com>2019-03-25 14:31:21 +0200
committerDavid Sterba <dsterba@suse.com>2019-04-29 19:02:35 +0200
commitc2d1b3aae33605a61cbab445d8ae1c708ccd2698 (patch)
treef0db726163ee3afb436a1b846264b4140cfc1531
parent040ee6120cb6706aa840a62f3b7966ebce9bfcd3 (diff)
btrfs: Honour FITRIM range constraints during free space trim
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: 499f377f49f0 ("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>
-rw-r--r--fs/btrfs/extent-tree.c25
1 files changed, 19 insertions, 6 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index aa52b0995fba..c5f9e8359c6f 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -11309,9 +11309,9 @@ int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
* held back allocations.
*/
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;
@@ -11354,8 +11354,8 @@ static int btrfs_trim_free_extents(struct btrfs_device *device,
if (!trans)
up_read(&fs_info->commit_root_sem);
- 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) {
up_read(&fs_info->commit_root_sem);
btrfs_put_transaction(trans);
@@ -11368,6 +11368,16 @@ 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);
mutex_unlock(&fs_info->chunk_mutex);
@@ -11377,6 +11387,10 @@ 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;
@@ -11460,8 +11474,7 @@ int btrfs_trim_fs(struct btrfs_fs_info *fs_info, 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;