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f2fs: fix to access nullified flush_cmd_control pointer

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f2fs_sync_file()             remount_ro
 - f2fs_readonly
                               - destroy_flush_cmd_control
 - f2fs_issue_flush
   - no fcc pointer!

So, this patch doesn't free fcc in this case, but just stop its kernel thread
which sends flush commands.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim
2016-12-07 16:23:32 -08:00
parent a2125ff7dd
commit 5eba8c5d1f
3 changed files with 29 additions and 11 deletions
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5
fs/f2fs/super.c
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@@ -1102,8 +1102,9 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
* or if flush_merge is not passed in mount option.
*/
if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
destroy_flush_cmd_control(sbi);
} else if (!SM_I(sbi)->cmd_control_info) {
clear_opt(sbi, FLUSH_MERGE);
destroy_flush_cmd_control(sbi, false);
} else {
err = create_flush_cmd_control(sbi);
if (err)
goto restore_gc;