erofs: add erofs_fscache_read_folios() helper

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Add erofs_fscache_read_folios() helper reading from fscache. It supports
on-demand read semantics. That is, it will make the backend prepare for
the data when cache miss. Once data ready, it will read from the cache.

This helper can then be used to implement .readpage()/.readahead() of
on-demand read semantics.

Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220425122143.56815-15-jefflexu@linux.alibaba.com
Acked-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

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Jeffle Xu 2022-04-25 20:21:36 +08:00 • committed by Gao Xiang

parent 3c265d7dce

commit ec00b5e29c

1 changed files with 54 additions and 0 deletions

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fs/erofs/fscache.c

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