f2fs: fix avoid race between truncate and background GC

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Thread A				Background GC
- f2fs_setattr isize to 0
 - truncate_setsize
					- gc_data_segment
					 - f2fs_get_read_data_page page #0
					  - set_page_dirty
					  - set_cold_data
 - f2fs_truncate

- f2fs_setattr isize to 4k
- read 4k <--- hit data in cached page #0

Above race condition can cause read out invalid data in a truncated
page, fix it by i_gc_rwsem[WRITE] lock.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

...

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Chao Yu 2018-08-05 23:04:25 +08:00 • committed by Jaegeuk Kim

parent c7079853c8

commit a33c150237

2 changed files with 27 additions and 14 deletions

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4

fs/f2fs/data.c

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39

fs/f2fs/file.c

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