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Huang Ying 9a01b56b1a f2fs: avoid node page to be written twice in gc_node_segment 
In gc_node_segment, if node page gc is run concurrently with node page
writeback, and check_valid_map and get_node_page run after page locked
and before cur_valid_map is updated as below, it is possible for the
page to be written twice unnecessarily.

			sync_node_pages
			  try_lock_page
			  ...
check_valid_map		  f2fs_write_node_page
			    ...
			    write_node_page
			      do_write_page
			        allocate_data_block
				  ...
				  refresh_sit_entry /* update cur_valid_map */
				  ...
			    ...
			    unlock_page
get_node_page
...
set_page_dirty
...
f2fs_put_page
  unlock_page

This can be solved via calling check_valid_map after get_node_page again.

Signed-off-by: Huang, Ying <ying.huang@intel.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
 		2014-09-09 13:15:07 -07:00
..
Kconfig f2fs: fix typo 2014-08-19 10:01:33 -07:00
Makefile f2fs: key functions to handle inline data 2013-12-26 20:40:09 +09:00
acl.c f2fs: remove the redundant validation check of acl 2014-07-09 14:04:25 -07:00
acl.h f2fs: use generic posix ACL infrastructure 2014-01-25 23:58:19 -05:00
checkpoint.c f2fs: need fsck.f2fs when f2fs_bug_on is triggered 2014-09-09 13:15:02 -07:00
data.c f2fs: need fsck.f2fs when f2fs_bug_on is triggered 2014-09-09 13:15:02 -07:00
debug.c f2fs: fix typo 2014-08-19 10:01:33 -07:00
dir.c f2fs: need fsck.f2fs when f2fs_bug_on is triggered 2014-09-09 13:15:02 -07:00
f2fs.h f2fs: use lock-less list(llist) to simplify the flush cmd management 2014-09-09 13:15:06 -07:00
file.c f2fs: need fsck.f2fs when f2fs_bug_on is triggered 2014-09-09 13:15:02 -07:00
gc.c f2fs: avoid node page to be written twice in gc_node_segment 2014-09-09 13:15:07 -07:00
gc.h f2fs: fix typo 2014-08-19 10:01:33 -07:00
hash.c f2fs: fix wrong casting for dentry name 2014-08-29 00:26:50 -07:00
inline.c f2fs: need fsck.f2fs when f2fs_bug_on is triggered 2014-09-09 13:15:02 -07:00
inode.c f2fs: need fsck.f2fs when f2fs_bug_on is triggered 2014-09-09 13:15:02 -07:00
namei.c f2fs: introduce F2FS_I_SB, F2FS_M_SB, and F2FS_P_SB 2014-09-03 17:37:13 -07:00
node.c f2fs: refactor flush_sit_entries codes for reducing SIT writes 2014-09-09 13:15:05 -07:00
node.h f2fs: introduce F2FS_I_SB, F2FS_M_SB, and F2FS_P_SB 2014-09-03 17:37:13 -07:00
recovery.c f2fs: need fsck.f2fs when f2fs_bug_on is triggered 2014-09-09 13:15:02 -07:00
segment.c f2fs: use lock-less list(llist) to simplify the flush cmd management 2014-09-09 13:15:06 -07:00
segment.h f2fs: refactor flush_sit_entries codes for reducing SIT writes 2014-09-09 13:15:05 -07:00
super.c f2fs: need fsck.f2fs if the recovery was failed 2014-09-09 13:15:04 -07:00
xattr.c f2fs: need fsck.f2fs when f2fs_bug_on is triggered 2014-09-09 13:15:02 -07:00
xattr.h f2fs: pass flags field to setxattr functions 2014-05-07 10:21:56 +09:00