f2fs: cover cp_file information with ilock
If a file is linked with other files, it should be checkpointed at every fsync
calls.
For this, we use set_cp_file() with FADVISE_CP_BIT, but previously we didn't
cover the flag by the global lock.
This patch fixes that the inode page stores this correctly.
Signed-off-by: NJaegeuk Kim <jaegeuk.kim@samsung.com>
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