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| author | David Sterba <dsterba@suse.com> | 2022-07-26 20:54:10 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2022-12-05 18:00:41 +0100 |
| commit | 63a7cb13071842966c1ce931edacbc23573aada5 (patch) | |
| tree | f888ce16a46f6aad0414e3457b15f0bcf416e615 /fs/btrfs/volumes.c | |
| parent | 467761f90405004e58795116aa7d81f3d298dcfb (diff) | |
| download | linux-63a7cb13071842966c1ce931edacbc23573aada5.tar.bz2 | |
btrfs: auto enable discard=async when possible
There's a request to automatically enable async discard for capable
devices. We can do that, the async mode is designed to wait for larger
freed extents and is not intrusive, with limits to iops, kbps or latency.
The status and tunables will be exported in /sys/fs/btrfs/FSID/discard .
The automatic selection is done if there's at least one discard capable
device in the filesystem (not capable devices are skipped). Mounting
with any other discard option will honor that option, notably mounting
with nodiscard will keep it disabled.
Link: https://lore.kernel.org/linux-btrfs/CAEg-Je_b1YtdsCR0zS5XZ_SbvJgN70ezwvRwLiCZgDGLbeMB=w@mail.gmail.com/
Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/volumes.c')
| -rw-r--r-- | fs/btrfs/volumes.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 635f45f1a2ef..796e9f5ff8f8 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -641,6 +641,9 @@ static int btrfs_open_one_device(struct btrfs_fs_devices *fs_devices, if (!bdev_nonrot(bdev)) fs_devices->rotating = true; + if (bdev_max_discard_sectors(bdev)) + fs_devices->discardable = true; + device->bdev = bdev; clear_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state); device->mode = flags; |