diff options
| author | Luca Stefani <luca.stefani.ge1@gmail.com> | 2024-09-17 22:33:04 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2024-10-07 23:21:53 +0200 |
| commit | a99fcb0158978ed332009449b484e5f3ca2d7df4 (patch) | |
| tree | 9cdee55aaaeb2b9e3a62700e2c409f020c051fa5 /fs/btrfs/volumes.h | |
| parent | d6e7ac65d4c106149d08a0ffba39fc516ae3d21b (diff) | |
btrfs: split remaining space to discard in chunks
Per Qu Wenruo in case we have a very large disk, e.g. 8TiB device,
mostly empty although we will do the split according to our super block
locations, the last super block ends at 256G, we can submit a huge
discard for the range [256G, 8T), causing a large delay.
Split the space left to discard based on BTRFS_MAX_DISCARD_CHUNK_SIZE in
preparation of introduction of cancellation points to trim. The value
of the chunk size is arbitrary, it can be higher or derived from actual
device capabilities but we can't easily read that using
bio_discard_limit().
Link: https://bugzilla.kernel.org/show_bug.cgi?id=219180
Link: https://bugzilla.suse.com/show_bug.cgi?id=1229737
CC: stable@vger.kernel.org # 5.15+
Signed-off-by: Luca Stefani <luca.stefani.ge1@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/volumes.h')
| -rw-r--r-- | fs/btrfs/volumes.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index 03d2d60afe0c..4481575dd70f 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -30,6 +30,12 @@ struct btrfs_zoned_device_info; #define BTRFS_MAX_DATA_CHUNK_SIZE (10ULL * SZ_1G) +/* + * Arbitratry maximum size of one discard request to limit potentially long time + * spent in blkdev_issue_discard(). + */ +#define BTRFS_MAX_DISCARD_CHUNK_SIZE (SZ_1G) + extern struct mutex uuid_mutex; #define BTRFS_STRIPE_LEN SZ_64K |