erofs: refine z_erofs_transform_plain() for sub-page block support

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Sub-page block support is still unusable even with previous commits if
interlaced PLAIN pclusters exist.  Such pclusters can be found if the
fragment feature is enabled.

This commit tries to handle "the head part" of interlaced PLAIN
pclusters first: it was once explained in commit fdffc091e6 ("erofs:
support interlaced uncompressed data for compressed files").

It uses a unique way for both shifted and interlaced PLAIN pclusters.
As an added bonus, PLAIN pclusters larger than the block size is also
supported now for the upcoming large lclusters.

Reviewed-by: Yue Hu <huyue2@coolpad.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20231206091057.87027-5-hsiangkao@linux.alibaba.com

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This commit is contained in:

Gao Xiang 2023-12-06 17:10:56 +08:00

parent e5aba911de

commit 1ca0152014

1 changed files with 48 additions and 33 deletions

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fs/erofs/decompressor.c

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