kernel.git/fs/btrfs/sysfs.c, branch linux-5.19.y

btrfs: change the bg_reclaim_threshold valid region from 0 to 100

2022-05-16T15:03:11Z

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

btrfs: make the bg_reclaim_threshold per-space info

2022-05-16T15:03:11Z

For non-zoned file systems it's useful to have the auto reclaim feature, however there are different use cases for non-zoned, for example we may not want to reclaim metadata chunks ever, only data chunks. Move this sysfs flag to per-space_info. This won't affect current users because this tunable only ever did anything for zoned, and that is currently hidden behind BTRFS_CONFIG_DEBUG. Tested-by: Pankaj Raghav Signed-off-by: Josef Bacik [ jth restore global bg_reclaim_threshold ] Signed-off-by: Johannes Thumshirn Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: expand subpage support to any PAGE_SIZE > 4K

2022-05-16T15:03:11Z

With the recent change in metadata handling, we can handle metadata in the following cases: - nodesize < PAGE_SIZE and sectorsize < PAGE_SIZE Go subpage routine for both metadata and data. - nodesize < PAGE_SIZE and sectorsize >= PAGE_SIZE Invalid case for now. As we require nodesize >= sectorsize. - nodesize >= PAGE_SIZE and sectorsize < PAGE_SIZE Go subpage routine for data, but regular page routine for metadata. - nodesize >= PAGE_SIZE and sectorsize >= PAGE_SIZE Go regular page routine for both metadata and data. Now we can handle any sectorsize < PAGE_SIZE, plus the existing sectorsize == PAGE_SIZE support. But here we introduce an artificial limit, any PAGE_SIZE > 4K case, we will only support 4K and PAGE_SIZE as sector size. The idea here is to reduce the test combinations, and push 4K as the default standard in the future. Signed-off-by: Qu Wenruo Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: sysfs: export the balance paused state of exclusive operation

2022-05-05T19:05:56Z

The new state allowing device addition with paused balance is not exported to user space so it can't recognize it and actually start the operation. Fixes: efc0e69c2fea ("btrfs: introduce exclusive operation BALANCE_PAUSED state") CC: stable@vger.kernel.org # 5.17 Signed-off-by: David Sterba

btrfs: replace BUILD_BUG_ON by static_assert

2022-03-14T12:13:49Z

The static_assert introduced in 6bab69c65013 ("build_bug.h: add wrapper for _Static_assert") has been supported by compilers for a long time (gcc 4.6, clang 3.0) and can be used in header files. We don't need to put BUILD_BUG_ON to random functions but rather keep it next to the definition. The exception here is the UAPI header btrfs_tree.h that could be potentially included by userspace code and the static assert is not defined (nor used in any other header). Reviewed-by: Johannes Thumshirn Signed-off-by: David Sterba

btrfs: add definition for EXTENT_TREE_V2

2022-03-14T12:13:48Z

This adds the initial definition of the EXTENT_TREE_V2 incompat feature flag. This also hides the support behind CONFIG_BTRFS_DEBUG. THIS IS A IN DEVELOPMENT FORMAT CHANGE, DO NOT USE UNLESS YOU ARE A DEVELOPER OR A TESTER. The format is in flux and will be added in stages, any fs will need to be re-made between updates to the format. Signed-off-by: Josef Bacik Signed-off-by: David Sterba

btrfs: sysfs: add devinfo/fsid to retrieve actual fsid from the device

2022-01-07T13:18:25Z

In the case of the seed device, the fsid can be different from the mounted sprout fsid. The userland has to read the device superblock to know the fsid but, that idea fails if the device is missing. So add a sysfs interface devinfo//fsid to show the fsid of the device. For example: $ cd /sys/fs/btrfs/b10b02a5-f9de-4276-b9e8-2bfd09a578a8 $ cat devinfo/1/fsid c44d771f-639d-4df3-99ec-5bc7ad2af93b $ cat devinfo/3/fsid b10b02a5-f9de-4276-b9e8-2bfd09a578a8 Though it's related to seeding, the name of the sysfs file is plain fsid as it matches what blkid says. A path to the device's fsid will aid scripting. Reviewed-by: Josef Bacik Signed-off-by: Anand Jain Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: sysfs: convert scnprintf and snprintf to sysfs_emit

2021-10-26T17:08:07Z

Commit 2efc459d06f1 ("sysfs: Add sysfs_emit and sysfs_emit_at to format sysfs out") merged in 5.10 introduced two new functions sysfs_emit() and sysfs_emit_at() which are aware of the PAGE_SIZE limit of the output buffer. Use the above two new functions instead of scnprintf() and snprintf() in various sysfs show(). Reviewed-by: Josef Bacik Signed-off-by: Anand Jain Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: sysfs: document structures and their associated files

2021-08-23T11:19:12Z

Sysfs file has grown big. It takes some time to locate the correct struct attribute to add new files. Create a table and map the struct attribute to its sysfs path. Also, fix the comment about the debug sysfs path. And add the comments to the attributes instead of attribute group, where sysfs file names are defined. Signed-off-by: Anand Jain Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: zoned: allow disabling of zone auto reclaim

2021-08-23T11:19:11Z

Automatically reclaiming dirty zones might not always be desired for all workloads, especially as there are currently still some rough edges with the relocation code on zoned filesystems. Allow disabling zone auto reclaim on a per filesystem basis by writing 0 as the threshold value. Reviewed-by: Naohiro Aota Signed-off-by: Johannes Thumshirn Reviewed-by: David Sterba Signed-off-by: David Sterba