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f2fs: Convert to using invalidate_lock
Use invalidate_lock instead of f2fs' private i_mmap_sem. The intended purpose is exactly the same. By this conversion we fix a long standing race between hole punching and read(2) / readahead(2) paths that can lead to stale page cache contents. CC: Jaegeuk Kim <jaegeuk@kernel.org> CC: Chao Yu <yuchao0@huawei.com> CC: linux-f2fs-devel@lists.sourceforge.net Signed-off-by: Jan Kara <jack@suse.cz>
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