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