tree 76cd720f7405d4ee8042ac86176c1ee2a713ff38
parent e5e0906b6b4c517a8622f2ff196c19cbd1068644
author Jaegeuk Kim <jaegeuk@kernel.org> 1432862357 -0700
committer Jaegeuk Kim <jaegeuk@kernel.org> 1433200869 -0700

f2fs: fix a deadlock for summary page lock vs. sentry_lock

In f2fs_gc:                      In f2fs_replace_block:
 - lock_page(sum_page)
  - check_valid_map()            - mutex_lock(sentry_lock)
   - mutex_lock(sentry_lock)     - change_curseg()
                                  - lock_page(sum_page)

This patch fixes the deadlock condition.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>