erofs: dax support for non-tailpacking regular file

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DAX is quite useful for some VM use cases in order to save guest
memory extremely with minimal lightweight EROFS.

In order to prepare for such use cases, add preliminary dax support
for non-tailpacking regular files for now.

Tested with the DRAM-emulated PMEM and the EROFS image generated by
"mkfs.erofs -Enoinline_data enwik9.fsdax.img enwik9"

Link: https://lore.kernel.org/r/20210805003601.183063-3-hsiangkao@linux.alibaba.com
Cc: nvdimm@lists.linux.dev
Cc: linux-fsdevel@vger.kernel.org
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

...

This commit is contained in:

Gao Xiang 2021-08-05 08:36:00 +08:00

parent a08e67a028

commit 06252e9ce0

5 changed files with 107 additions and 4 deletions

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3

Documentation/filesystems/erofs.rst

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42

fs/erofs/data.c

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4

fs/erofs/inode.c

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3

fs/erofs/internal.h

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59

fs/erofs/super.c

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