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f2fs: avoid GC causing encrypted file corrupted
The encrypted file may be corrupted by GC in following case:
Time 1: | segment 1 blkaddr = A | GC -> | segment 2 blkaddr = B |
Encrypted block 1 is moved from blkaddr A of segment 1 to blkaddr B of
segment 2,
Time 2: | segment 1 blkaddr = B | GC -> | segment 3 blkaddr = C |
Before page 1 is written back and if segment 2 become a victim, then
page 1 is moved from blkaddr B of segment 2 to blkaddr Cof segment 3,
during the GC process of Time 2, f2fs should wait for page 1 written back
before reading it, or move_data_block will read a garbage block from
blkaddr B since page is not written back to blkaddr B yet.
Commit 6aa58d8a
("f2fs: readahead encrypted block during GC") introduce
ra_data_block to read encrypted block, but it forgets to add
f2fs_wait_on_page_writeback to avoid racing between GC and flush.
Signed-off-by: Yunlong Song <yunlong.song@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
parent
6f8b52ba44
commit
9bf1a3f739
1 changed files with 10 additions and 0 deletions
10
fs/f2fs/gc.c
10
fs/f2fs/gc.c
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@ -658,6 +658,14 @@ static int ra_data_block(struct inode *inode, pgoff_t index)
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fio.page = page;
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fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;
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/*
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* don't cache encrypted data into meta inode until previous dirty
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* data were writebacked to avoid racing between GC and flush.
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*/
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f2fs_wait_on_page_writeback(page, DATA, true);
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f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);
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fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(sbi),
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dn.data_blkaddr,
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FGP_LOCK | FGP_CREAT, GFP_NOFS);
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@ -745,6 +753,8 @@ static int move_data_block(struct inode *inode, block_t bidx,
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*/
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f2fs_wait_on_page_writeback(page, DATA, true);
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f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);
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err = f2fs_get_node_info(fio.sbi, dn.nid, &ni);
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if (err)
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goto put_out;
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