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f2fs: compress: fix zstd data corruption

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During zstd compression, ZSTD_endStream() may return non-zero value
because distination buffer is full, but there is still compressed data
remained in intermediate buffer, it means that zstd algorithm can not
save at last one block space, let's just writeback raw data instead of
compressed one, this can fix data corruption when decompressing
incomplete stored compression data.

Fixes: 50cfa66f0d ("f2fs: compress: support zstd compress algorithm")
Signed-off-by: Daeho Jeong <daehojeong@google.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2020-05-08 09:16:03 +08:00 committed by Jaegeuk Kim
parent 9c1223845a
commit 1454c978ef
1 changed files with 7 additions and 0 deletions
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7
fs/f2fs/compress.c
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@ -360,6 +360,13 @@ static int zstd_compress_pages(struct compress_ctx *cc)
return -EIO;
}
/*
* there is compressed data remained in intermediate buffer due to
* no more space in cbuf.cdata
*/
if (ret)
return -EAGAIN;
cc->clen = outbuf.pos;
return 0;
}