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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2022-01-11 23:51:10 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-01-11 23:51:10 +0100 |
| commit | 9149fe8ba7ff798ea1c6b1fa05eeb59f95f9a94a (patch) | |
| tree | a982c6380c74c851720829eef7237610d2c10bac /Documentation | |
| parent | drivers/pcmcia: Fix ifdef covering yenta_pm_ops (diff) | |
| parent | erofs: use meta buffers for zmap operations (diff) | |
| download | linux-9149fe8ba7ff798ea1c6b1fa05eeb59f95f9a94a.tar.xz linux-9149fe8ba7ff798ea1c6b1fa05eeb59f95f9a94a.zip | |
Merge tag 'erofs-for-5.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs
Pull erofs updates from Gao Xiang:
"In this cycle, tail-packing data inline for compressed files is now
supported so that tail pcluster can be stored and read together with
inode metadata in order to save data I/O and storage space.
In addition to that, to prepare for the upcoming subpage, folio and
fscache features, we also introduce meta buffers to get rid of
erofs_get_meta_page() since it was too close to the page itself.
In addition, in order to show supported kernel features and control
sync decompression strategy, new sysfs nodes are introduced in this
cycle as well.
Summary:
- add sysfs interface and a sysfs node to control sync decompression
- add tail-packing inline support for compressed files
- get rid of erofs_get_meta_page()"
* tag 'erofs-for-5.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs:
erofs: use meta buffers for zmap operations
erofs: use meta buffers for xattr operations
erofs: use meta buffers for super operations
erofs: use meta buffers for inode operations
erofs: introduce meta buffer operations
erofs: add on-disk compressed tail-packing inline support
erofs: support inline data decompression
erofs: support unaligned data decompression
erofs: introduce z_erofs_fixup_insize
erofs: tidy up z_erofs_lz4_decompress
erofs: clean up erofs_map_blocks tracepoints
erofs: Replace zero-length array with flexible-array member
erofs: add sysfs node to control sync decompression strategy
erofs: add sysfs interface
erofs: rename lz4_0pading to zero_padding
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-fs-erofs | 16 | ||||
| -rw-r--r-- | Documentation/filesystems/erofs.rst | 8 |
2 files changed, 24 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-fs-erofs b/Documentation/ABI/testing/sysfs-fs-erofs new file mode 100644 index 000000000000..05482374a741 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-fs-erofs @@ -0,0 +1,16 @@ +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. + +What: /sys/fs/erofs/<disk>/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. diff --git a/Documentation/filesystems/erofs.rst b/Documentation/filesystems/erofs.rst index 01df283c7d04..7119aa213be7 100644 --- a/Documentation/filesystems/erofs.rst +++ b/Documentation/filesystems/erofs.rst @@ -93,6 +93,14 @@ dax A legacy option which is an alias for ``dax=always``. device=%s Specify a path to an extra device to be used together. =================== ========================================================= +Sysfs Entries +============= + +Information about mounted erofs file systems can be found in /sys/fs/erofs. +Each mounted filesystem will have a directory in /sys/fs/erofs based on its +device name (i.e., /sys/fs/erofs/sda). +(see also Documentation/ABI/testing/sysfs-fs-erofs) + On-disk details =============== |