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Subject[PATCH] f2fs: avoid wrong decrypted data from disk
Date
1. Create a file in an encrypted directory
2. Do GC & drop caches
3. Read stale data before its bio for metapage was not issued yet

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
fs/f2fs/data.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 382c1ef9a9e4..c3557fd4a0bd 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1550,6 +1550,13 @@ static int f2fs_mpage_readpages(struct address_space *mapping,
bio = NULL;
}
if (bio == NULL) {
+ /*
+ * If the page is under writeback, we need to wait for
+ * its completion to see the correct decrypted data.
+ */
+ if (unlikely(f2fs_encrypted_file(inode)))
+ f2fs_wait_on_block_writeback(F2FS_I_SB(inode), block_nr);
+
bio = f2fs_grab_read_bio(inode, block_nr, nr_pages,
is_readahead ? REQ_RAHEAD : 0);
if (IS_ERR(bio)) {
--
2.17.0.441.gb46fe60e1d-goog
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