diff options
| author | Chao Yu <yuchao0@huawei.com> | 2018-02-25 23:38:21 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-30 07:52:33 +0200 |
| commit | 393e472db4c85eb7f1f698569994bc60c1fc61be (patch) | |
| tree | bda1f50aba9b85ce3fb04ed3ccc3495cc6f2b9bd | |
| parent | d71b8b0d37da25e7fe4186e1c3d873a946f371a3 (diff) | |
f2fs: fix to set KEEP_SIZE bit in f2fs_zero_range
[ Upstream commit 17cd07ae95073c298af92c1ba14ac58ce84de33b ]
As Jayashree Mohan reported:
A simple workload to reproduce this would be :
1. create foo
2. Write (8K - 16K) // foo size = 16K now
3. fsync()
4. falloc zero_range , keep_size (4202496 - 4210688) // foo size must be 16K
5. fdatasync()
Crash now
On recovery, we see that the file size is 4210688 and not 16K, which
violates the semantics of keep_size flag. We have a test case to
reproduce this using CrashMonkey on 4.15 kernel. Try this out by
simply running :
./c_harness -f /dev/sda -d /dev/cow_ram0 -t f2fs -e 102400 -P -v
tests/generic_468_zero.so
The root cause is that we miss to set KEEP_SIZE bit correctly in zero_range
when zeroing block cross EOF with FALLOC_FL_KEEP_SIZE, let's fix this
missing case.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/f2fs/file.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index b8372095ba0a..29c5f799890c 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -1321,8 +1321,12 @@ static int f2fs_zero_range(struct inode *inode, loff_t offset, loff_t len, } out: - if (!(mode & FALLOC_FL_KEEP_SIZE) && i_size_read(inode) < new_size) - f2fs_i_size_write(inode, new_size); + if (new_size > i_size_read(inode)) { + if (mode & FALLOC_FL_KEEP_SIZE) + file_set_keep_isize(inode); + else + f2fs_i_size_write(inode, new_size); + } out_sem: up_write(&F2FS_I(inode)->i_mmap_sem); |