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linux-yocto/Documentation/ABI/testing/sysfs-fs-erofs
Chunhai Guo db80b98305 erofs: add sysfs node to drop internal caches 
Add a sysfs node to drop compression-related caches, currently used to
drop in-memory pclusters and cached compressed folios.

Signed-off-by: Chunhai Guo <guochunhai@vivo.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20241113041148.749129-1-guochunhai@vivo.com
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
2024-11-18 18:50:13 +08:00

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What: /sys/fs/erofs/features/ Date: November 2021 Contact: "Huang Jianan" huangjianan@oppo.com Description: Shows all enabled kernel features. Supported features: zero_padding, compr_cfgs, big_pcluster, chunked_file, device_table, compr_head2, sb_chksum, ztailpacking, dedupe, fragments.

What: /sys/fs/erofs//sync_decompress Date: November 2021 Contact: "Huang Jianan" huangjianan@oppo.com Description: Control strategy of sync decompression:

	- 0 (default, auto): enable for readpage, and enable for
	  readahead on atomic contexts only.
	- 1 (force on): enable for readpage and readahead.
	- 2 (force off): disable for all situations.

What: /sys/fs/erofs//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