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f2fs: fix data corruption issue with hardware encryption

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Direct IO can be used in case of hardware encryption. The following
scenario results into data corruption issue in this path -

Thread A -                          Thread B-
-> write file#1 in direct IO
                                    -> GC gets kicked in
                                    -> GC submitted bio on meta mapping
				       for file#1, but pending completion
-> write file#1 again with new data
   in direct IO
                                    -> GC bio gets completed now
                                    -> GC writes old data to the new
                                       location and thus file#1 is
				       corrupted.

Fix this by submitting and waiting for pending io on meta mapping
for direct IO case in f2fs_map_blocks().

Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Sahitya Tummala
2018-10-10 10:56:22 +05:30
committed by Jaegeuk Kim
parent 0c093b590e
commit 1e78e8bd9d
3 changed files with 22 additions and 0 deletions
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9
fs/f2fs/segment.c
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@@ -3303,6 +3303,15 @@ void f2fs_wait_on_block_writeback(struct inode *inode, block_t blkaddr)
}
}
void f2fs_wait_on_block_writeback_range(struct inode *inode, block_t blkaddr,
block_t len)
{
block_t i;
for (i = 0; i < len; i++)
f2fs_wait_on_block_writeback(inode, blkaddr + i);
}
static int read_compacted_summaries(struct f2fs_sb_info *sbi)
{
struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);