aboutsummaryrefslogtreecommitdiffstats
path: root/fs/f2fs/data.c
diff options
context:
space:
mode:
authorJaegeuk Kim <jaegeuk.kim@samsung.com>2014-01-16 16:20:40 +0900
committerZiyan <jaraidaniel@gmail.com>2015-05-02 14:36:09 +0200
commitfabfb4191960629dbb2f6c9a1d3012c5fc054cdf (patch)
tree77318f787f2f6c0b2b6cf241405f9afd8e25e482 /fs/f2fs/data.c
parent443d894a2be5fc3d0189fc19e3e299d8a6f402c0 (diff)
downloadkernel_samsung_tuna-fabfb4191960629dbb2f6c9a1d3012c5fc054cdf.zip
kernel_samsung_tuna-fabfb4191960629dbb2f6c9a1d3012c5fc054cdf.tar.gz
kernel_samsung_tuna-fabfb4191960629dbb2f6c9a1d3012c5fc054cdf.tar.bz2
f2fs: avoid f2fs_balance_fs call during pageout
This patch should resolve the following bug. ========================================================= [ INFO: possible irq lock inversion dependency detected ] 3.13.0-rc5.f2fs+ #6 Not tainted --------------------------------------------------------- kswapd0/41 just changed the state of lock: (&sbi->gc_mutex){+.+.-.}, at: [<ffffffffa030503e>] f2fs_balance_fs+0xae/0xd0 [f2fs] but this lock took another, RECLAIM_FS-READ-unsafe lock in the past: (&sbi->cp_rwsem){++++.?} and interrupts could create inverse lock ordering between them. other info that might help us debug this: Chain exists of: &sbi->gc_mutex --> &sbi->cp_mutex --> &sbi->cp_rwsem Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sbi->cp_rwsem); local_irq_disable(); lock(&sbi->gc_mutex); lock(&sbi->cp_mutex); <Interrupt> lock(&sbi->gc_mutex); *** DEADLOCK *** This bug is due to the f2fs_balance_fs call in f2fs_write_data_page. If f2fs_write_data_page is triggered by wbc->for_reclaim via kswapd, it should not call f2fs_balance_fs which tries to get a mutex grabbed by original syscall flow. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Diffstat (limited to 'fs/f2fs/data.c')
-rw-r--r--fs/f2fs/data.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 9a91c9a..81c0ecb 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -841,8 +841,10 @@ write:
else if (err)
goto redirty_out;
- if (wbc->for_reclaim)
+ if (wbc->for_reclaim) {
f2fs_submit_merged_bio(sbi, DATA, WRITE);
+ need_balance_fs = false;
+ }
clear_cold_data(page);
out: