kernel/linux.git/fs/btrfs/sysfs.c, branch linux-6.0.y

btrfs: separate BLOCK_GROUP_TREE compat RO flag from EXTENT_TREE_V2

2023-01-12T11:00:44+00:00

[ Upstream commit 1c56ab991903dce60e905a08f431c0e6f79b9b9e ] The problem of long mount time caused by block group item search is already known for some time, and the solution of block group tree has been proposed. There is really no need to bound this feature into extent tree v2, just introduce compat RO flag, BLOCK_GROUP_TREE, to correctly solve the problem. All the code handling block group root is already in the upstream kernel, thus this patch really only needs to introduce the new compat RO flag. This patch introduces one extra artificial limitation on block group tree feature, that free space cache v2 and no-holes feature must be enabled to use this new compat RO feature. This artificial requirement is mostly to reduce the test combinations, and can be a guideline for future features, to mostly rely on the latest default features. Signed-off-by: Qu Wenruo Reviewed-by: David Sterba Signed-off-by: David Sterba Stable-dep-of: 2ba48b20049b ("btrfs: fix compat_ro checks against remount") Signed-off-by: Sasha Levin

btrfs: sysfs: normalize the error handling branch in btrfs_init_sysfs()

2022-12-02T16:43:17+00:00

commit ffdbb44f2f23f963b8f5672e35c3a26088177a62 upstream. Although kset_unregister() can eventually remove all attribute files, explicitly rolling back with the matching function makes the code logic look clearer. CC: stable@vger.kernel.org # 5.4+ Reviewed-by: Qu Wenruo Signed-off-by: Zhen Lei Reviewed-by: David Sterba Signed-off-by: David Sterba Signed-off-by: Greg Kroah-Hartman

btrfs: sysfs: remove BIG_METADATA feature files

2022-07-25T15:45:39+00:00

This flag has been merged in 3.10 and is effectively always-on. Its status depends on the host page size so there's another way to guarantee compatibility with old kernels. Due to a bug introduced in 6f93e834fa7c ("btrfs: fix upper limit for max_inline for page size 64K") the flag is not persisted among features in the superblock so it's not reliable. Signed-off-by: Nikolay Borisov Reviewed-by: David Sterba [ update changelog ] Signed-off-by: David Sterba

btrfs: sysfs: remove MIXED_BACKREF feature file

2022-07-25T15:45:39+00:00

This feature has been the default for about 13 year. At this point it's safe to consider it an indispensable feature of BTRFS as such there's no need to advertise it in sysfs. Remove the global sysfs feature file, the per-filesystem feature file has never been there. Signed-off-by: Nikolay Borisov Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: sysfs: export commit stats

2022-07-25T15:45:37+00:00

Export commit stats in file /sys/fs/btrfs/UUID/commit_stats with example output like: commits 123 last_commit_ms 11 max_commit_ms 150 total_commit_ms 2000 The values are in one file so reading them at a single time will give a more consistent view. The stats are internally tracked in nanoseconds so the cumulative values should not suffer from rounding errors. Writing 0 to the file 'commit_stats' will reset max_commit_ms. Initial values are set at first mount of the filesystem. Reviewed-by: Nikolay Borisov Signed-off-by: Ioannis Angelakopoulos [ update changelog ] Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: sysfs: advertise zoned support among features

2022-07-25T15:45:34+00:00

We've hidden the zoned support in sysfs under debug config for the first releases but now the stability is reasonable, though not all features have been implemented. Signed-off-by: David Sterba

btrfs: sysfs: add force_chunk_alloc trigger to force allocation

2022-07-25T15:45:32+00:00

Adds write-only trigger to force new chunk allocation for a given block group type. It is at /sys/fs/btrfs//allocation//force_chunk_alloc Note: this is now only for debugging and testing and is enabled with the CONFIG_BTRFS_DEBUG configuration option. The transaction is started from sysfs context and can be problematic in some cases. Signed-off-by: Stefan Roesch Reviewed-by: David Sterba [ Changes from the original submission: - update changelog - drop unnecessary error messages - switch value to bool and use kstrtobool - move BTRFS_ATTR_W definition - add comment for using transaction ] Signed-off-by: David Sterba

btrfs: sysfs: export chunk size in space infos

2022-07-25T15:45:32+00:00

Add new sysfs knob /sys/fs/btrfs//allocation//chunk_size. This allows to query the chunk size and also set the chunk size. Constraints: - can be changed by root only - system chunk size can't be set - maximum chunk size is 10% of the filesystem size - final value is rounded down to a multiple of 256M - cannot be set on zoned filesystem Note, that rounding and the 10% clamp will result to a different value on filesystems smaller than 10G, typically 768M. Signed-off-by: Stefan Roesch Reviewed-by: David Sterba [ Changes to original submission: - document setting constraints - drop read-only requirement - drop unnecessary error messages - fix return values of _store callback - use memparse for the value - fix rounding down to 256M ] Signed-off-by: David Sterba

btrfs: fix typos in comments

2022-07-25T15:44:33+00:00

Codespell has found a few typos. Signed-off-by: David Sterba

btrfs: change the bg_reclaim_threshold valid region from 0 to 100

2022-05-16T15:03:11+00:00

For the non-zoned case we may want to set the threshold for reclaim to something below 50%. Change the acceptable threshold from 50-100 to 0-100. Tested-by: Pankaj Raghav Signed-off-by: Josef Bacik Signed-off-by: Johannes Thumshirn Reviewed-by: David Sterba Signed-off-by: David Sterba