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| author |   Jaegeuk Kim <jaegeuk@kernel.org> | 2018-08-22 21:18:00 -0700 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2018-09-05 13:41:07 -0700 |
| commit | 0ded69f632bb717be9aeea3ae74e29050fcb060c (patch) | |
| tree | 2e163c4d4d623d41c061f5884fe405bd71c0b050 /fs/f2fs/data.c | |
| parent | Revert "f2fs: use printk_ratelimited for f2fs_msg" (diff) | |
| download | wireguard-linux-0ded69f632bb717be9aeea3ae74e29050fcb060c.tar.xz wireguard-linux-0ded69f632bb717be9aeea3ae74e29050fcb060c.zip | |
f2fs: avoid wrong decrypted data from disk
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
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/data.c')
| -rw-r--r-- | fs/f2fs/data.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 382c1ef9a9e4..8c204f896c22 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -565,9 +565,6 @@ static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr, ctx->bio = bio; ctx->enabled_steps = post_read_steps; bio->bi_private = ctx; - - /* wait the page to be moved by cleaning */ - f2fs_wait_on_block_writeback(sbi, blkaddr); } return bio; @@ -582,6 +579,9 @@ static int f2fs_submit_page_read(struct inode *inode, struct page *page, if (IS_ERR(bio)) return PTR_ERR(bio); + /* wait for GCed page writeback via META_MAPPING */ + f2fs_wait_on_block_writeback(inode, blkaddr); + if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) { bio_put(bio); return -EFAULT; @@ -1558,6 +1558,12 @@ submit_and_realloc: } } + /* + * If the page is under writeback, we need to wait for + * its completion to see the correct decrypted data. + */ + f2fs_wait_on_block_writeback(inode, block_nr); + if (bio_add_page(bio, page, blocksize, 0) < blocksize) goto submit_and_realloc; @@ -1625,7 +1631,7 @@ static int encrypt_one_page(struct f2fs_io_info *fio) return 0; /* wait for GCed page writeback via META_MAPPING */ - f2fs_wait_on_block_writeback(fio->sbi, fio->old_blkaddr); + f2fs_wait_on_block_writeback(inode, fio->old_blkaddr); retry_encrypt: fio->encrypted_page = fscrypt_encrypt_page(inode, fio->page, @@ -2382,10 +2388,6 @@ repeat: f2fs_wait_on_page_writeback(page, DATA, false); - /* wait for GCed page writeback via META_MAPPING */ - if (f2fs_post_read_required(inode)) - f2fs_wait_on_block_writeback(sbi, blkaddr); - if (len == PAGE_SIZE || PageUptodate(page)) return 0; |