f2fs: Prevent s_writer rw_sem count mismatch in f2fs_evict_inode

If f2fs_evict_inode is called between freeze_super and thaw_super, the
s_writer rwsem count may become negative, resulting in hang.

CPU1                       CPU2

f2fs_resize_fs()           f2fs_evict_inode()
  f2fs_freeze
    set SBI_IS_FREEZING
                             skip sb_start_intwrite
  f2fs_unfreeze
    clear SBI_IS_FREEZING
                             sb_end_intwrite

To solve this problem, the call to sb_end_write is determined by whether
sb_start_intwrite is called, rather than the current freezing status.

Reviewed-by: Sungjong Seo <[email protected]>
Reviewed-by: Sunmin Jeong <[email protected]>
Signed-off-by: Yeongjin Gil <[email protected]>
Reviewed-by: Chao Yu <[email protected]>
Signed-off-by: Jaegeuk Kim <[email protected]>

0 files changed, 0 insertions, 0 deletions