erofs: adapt folios for z_erofs_readahead()

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It's a straight-forward conversion except that readahead_folio()
will do folio_put() in advance but it doesn't matter since folios
are still locked.

As before, since file-backed folios (pages for now) are locked, so
we could temporarily use folio->private as an internal counter to
indicate split parts of each folio for the corresponding pclusters
to decompress.

When such counter becomes zero, the folio will be finally unlocked
(see compress.h and z_erofs_onlinepage_endio()).

Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230817082813.81180-7-hsiangkao@linux.alibaba.com

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Gao Xiang 2023-08-17 16:28:12 +08:00

parent 06ec03660d

commit 491b1105a8

1 changed files with 15 additions and 17 deletions

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fs/erofs/zdata.c

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