1168e9a76SHuang JiananWhat: /sys/fs/erofs/features/ 2168e9a76SHuang JiananDate: November 2021 3168e9a76SHuang JiananContact: "Huang Jianan" <huangjianan@oppo.com> 4168e9a76SHuang JiananDescription: Shows all enabled kernel features. 5168e9a76SHuang Jianan Supported features: 6168e9a76SHuang Jianan zero_padding, compr_cfgs, big_pcluster, chunked_file, 76967f6cbSYue Hu device_table, compr_head2, sb_chksum, ztailpacking, 841409132SBo Liu (OpenAnolis) dedupe, fragments, 48bit, metabox. 940452ffcSHuang Jianan 1040452ffcSHuang JiananWhat: /sys/fs/erofs/<disk>/sync_decompress 1140452ffcSHuang JiananDate: November 2021 1240452ffcSHuang JiananContact: "Huang Jianan" <huangjianan@oppo.com> 138b1ac84dSHans de GoedeDescription: Control strategy of sync decompression: 148b1ac84dSHans de Goede 1540452ffcSHuang Jianan - 0 (default, auto): enable for readpage, and enable for 168b1ac84dSHans de Goede readahead on atomic contexts only. 1740452ffcSHuang Jianan - 1 (force on): enable for readpage and readahead. 1840452ffcSHuang Jianan - 2 (force off): disable for all situations. 19db80b983SChunhai Guo 20db80b983SChunhai GuoWhat: /sys/fs/erofs/<disk>/drop_caches 21db80b983SChunhai GuoDate: November 2024 22db80b983SChunhai GuoContact: "Guo Chunhai" <guochunhai@vivo.com> 23db80b983SChunhai GuoDescription: Writing to this will drop compression-related caches, 24db80b983SChunhai Guo currently used to drop in-memory pclusters and cached 25db80b983SChunhai Guo compressed folios: 26db80b983SChunhai Guo 27db80b983SChunhai Guo - 1 : invalidate cached compressed folios 28db80b983SChunhai Guo - 2 : drop in-memory pclusters 29db80b983SChunhai Guo - 3 : drop in-memory pclusters and cached compressed folios 30b4a29efcSBo Liu 31b4a29efcSBo LiuWhat: /sys/fs/erofs/accel 32b4a29efcSBo LiuDate: May 2025 33b4a29efcSBo LiuContact: "Bo Liu" <liubo03@inspur.com> 34b4a29efcSBo LiuDescription: Used to set or show hardware accelerators in effect 35b4a29efcSBo Liu and multiple accelerators are separated by '\n'. 36b4a29efcSBo Liu Supported accelerator(s): qat_deflate. 37b4a29efcSBo Liu Disable all accelerators with an empty string (echo > accel). 38*df0ce6ceSChao Yu 39*df0ce6ceSChao YuWhat: /sys/fs/erofs/<disk>/dir_ra_bytes 40*df0ce6ceSChao YuDate: July 2025 41*df0ce6ceSChao YuContact: "Chao Yu" <chao@kernel.org> 42*df0ce6ceSChao YuDescription: Used to set or show readahead bytes during readdir(), by 43*df0ce6ceSChao Yu default the value is 16384. 44*df0ce6ceSChao Yu 45*df0ce6ceSChao Yu - 0: disable readahead. 46