diff options
| author | Jaegeuk Kim <jaegeuk@kernel.org> | 2018-12-28 11:00:38 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-03-19 13:11:55 +0100 |
| commit | ff08fb99584337ac227c64572fbe734a0e376336 (patch) | |
| tree | 88cd128a6b06ebd619c133d8ecef24b991039349 | |
| parent | 4fa1d0ff4f0dcec58682ed3c21161239a1726cbb (diff) | |
f2fs: wait on atomic writes to count F2FS_CP_WB_DATA
commit 31867b23d7d1ee3535136c6a410a6cf56f666bfc upstream.
Otherwise, we can get wrong counts incurring checkpoint hang.
IO_W (CP: -24, Data: 24, Flush: ( 0 0 1), Discard: ( 0 0))
Thread A Thread B
- f2fs_write_data_pages
- __write_data_page
- f2fs_submit_page_write
- inc_page_count(F2FS_WB_DATA)
type is F2FS_WB_DATA due to file is non-atomic one
- f2fs_ioc_start_atomic_write
- set_inode_flag(FI_ATOMIC_FILE)
- f2fs_write_end_io
- dec_page_count(F2FS_WB_CP_DATA)
type is F2FS_WB_DATA due to file becomes
atomic one
Cc: <stable@vger.kernel.org>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/f2fs/file.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 9eaf07fd8b4c..7df6373c77bc 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -1749,10 +1749,12 @@ static int f2fs_ioc_start_atomic_write(struct file *filp) down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]); - if (!get_dirty_pages(inode)) - goto skip_flush; - - f2fs_msg(F2FS_I_SB(inode)->sb, KERN_WARNING, + /* + * Should wait end_io to count F2FS_WB_CP_DATA correctly by + * f2fs_is_atomic_file. + */ + if (get_dirty_pages(inode)) + f2fs_msg(F2FS_I_SB(inode)->sb, KERN_WARNING, "Unexpected flush for atomic writes: ino=%lu, npages=%u", inode->i_ino, get_dirty_pages(inode)); ret = filemap_write_and_wait_range(inode->i_mapping, 0, LLONG_MAX); @@ -1760,7 +1762,7 @@ static int f2fs_ioc_start_atomic_write(struct file *filp) up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]); goto out; } -skip_flush: + set_inode_flag(inode, FI_ATOMIC_FILE); clear_inode_flag(inode, FI_ATOMIC_REVOKE_REQUEST); up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]); |