On 2024/8/19 16:34, Yeongjin Gil wrote:
In f2fs_do_write_data_page, when the data block is NULL_ADDR, it skips
writepage considering that it has been already truncated.
This results in an infinite loop as the PAGECACHE_TAG_TOWRITE tag is not
cleared during the writeback process for a compressed file including
NULL_ADDR in compress_mode=user.

This is the reproduction process:

1. dd if=/dev/zero bs=4096 count=1024 seek=1024 of=testfile
2. f2fs_io compress testfile
3. dd if=/dev/zero bs=4096 count=1 conv=notrunc of=testfile
4. f2fs_io decompress testfile

To prevent the problem, let's check whether the cluster is fully
allocated before redirty its pages.

Fixes: 5fdb322ff2c2 ("f2fs: add F2FS_IOC_DECOMPRESS_FILE and 
F2FS_IOC_COMPRESS_FILE")
Reviewed-by: Sungjong Seo <[email protected]>
Reviewed-by: Sunmin Jeong <[email protected]>
Tested-by: Jaewook Kim <[email protected]>
Signed-off-by: Yeongjin Gil <[email protected]>

Reviewed-by: Chao Yu <[email protected]>

Thanks,


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