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Diffstat (limited to 'Documentation/ABI/testing/sysfs-fs-erofs')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-fs-erofs | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-fs-erofs b/Documentation/ABI/testing/sysfs-fs-erofs new file mode 100644 index 000000000..0b8b4354e --- /dev/null +++ b/Documentation/ABI/testing/sysfs-fs-erofs @@ -0,0 +1,49 @@ +What: /sys/fs/erofs/features/ +Date: November 2021 +Contact: "Huang Jianan" <huangjianan@oppo.com> +Description: Shows all enabled kernel features. + Supported features: + compr_cfgs, big_pcluster, chunked_file, device_table, + compr_head2, sb_chksum, ztailpacking, dedupe, fragments, + xattr_prefixes, 48bit, metabox. + +What: /sys/fs/erofs/<disk>/sync_decompress +Date: November 2021 +Contact: "Huang Jianan" <huangjianan@oppo.com> +Description: Control strategy of synchronous decompression. Synchronous + decompression tries to decompress in the reader thread for + synchronous reads and small asynchronous reads (<= 12 KiB): + + - 0 (auto, default): apply to synchronous reads only, but will + switch to 1 (force on) if any decompression + request is detected in atomic contexts; + - 1 (force on): apply to synchronous reads and small + asynchronous reads; + - 2 (force off): disable synchronous decompression completely. + +What: /sys/fs/erofs/<disk>/drop_caches +Date: November 2024 +Contact: "Guo Chunhai" <guochunhai@vivo.com> +Description: Writing to this will drop compression-related caches, + currently used to drop in-memory pclusters and cached + compressed folios: + + - 1 : invalidate cached compressed folios + - 2 : drop in-memory pclusters + - 3 : drop in-memory pclusters and cached compressed folios + +What: /sys/fs/erofs/accel +Date: May 2025 +Contact: "Bo Liu" <liubo03@inspur.com> +Description: Used to set or show hardware accelerators in effect + and multiple accelerators are separated by '\n'. + Supported accelerator(s): qat_deflate. + Disable all accelerators with an empty string (echo > accel). + +What: /sys/fs/erofs/<disk>/dir_ra_bytes +Date: July 2025 +Contact: "Chao Yu" <chao@kernel.org> +Description: Used to set or show readahead bytes during readdir(), by + default the value is 16384. + + - 0: disable readahead. |