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f2fs: fix to align to section for fallocate() on pinned file
[ Upstream commit e1175f0 ] Now, fallocate() on a pinned file only allocates blocks which aligns to segment rather than section, so GC may try to migrate pinned file's block, and after several times of failure, pinned file's block could be migrated to other place, however user won't be aware of such condition, and then old obsolete block address may be readed/written incorrectly. To avoid such condition, let's try to allocate pinned file's blocks with section alignment. Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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