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| author | Chao Yu <yuchao0@huawei.com> | 2018-08-05 23:04:25 +0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2018-08-13 10:48:17 -0700 |
| commit | a33c150237a20d97a174243bc658c86502f9d370 (patch) | |
| tree | 1bdaea29bcb138882d6318eb3e151b2febceba2a /fs/f2fs/data.c | |
| parent | c7079853c859c910b9d047a37891b4aafb8f8dd7 (diff) | |
| download | linux-a33c150237a20d97a174243bc658c86502f9d370.tar.gz | |
f2fs: fix avoid race between truncate and background GC
Thread A Background GC - f2fs_setattr isize to 0 - truncate_setsize - gc_data_segment - f2fs_get_read_data_page page #0 - set_page_dirty - set_cold_data - f2fs_truncate - f2fs_setattr isize to 4k - read 4k <--- hit data in cached page #0 Above race condition can cause read out invalid data in a truncated page, fix it by i_gc_rwsem[WRITE] lock. Signed-off-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 | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 1e6cc68fb7c4..45f043ee48bd 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -2199,8 +2199,12 @@ static void f2fs_write_failed(struct address_space *mapping, loff_t to) if (to > i_size) { down_write(&F2FS_I(inode)->i_mmap_sem); + down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]); + truncate_pagecache(inode, i_size); f2fs_truncate_blocks(inode, i_size, true); + + up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]); up_write(&F2FS_I(inode)->i_mmap_sem); } } |