[PATCH] nilfs: fix unprotected super_block flags modification in nilfs_error

[Jiro SEKIBA]

Hi,

This is a trivial patch to protect super_block flags.

super_block flags must be protected by the proper semaphore
when modifying it.

Signed-off-by: Jiro SEKIBA <j...@unicus.jp>
---
 fs/nilfs2/super.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 8173fae..3ee02b8 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -110,7 +110,9 @@ void nilfs_error(struct super_block *sb, const char 
*function,
 
                if (nilfs_test_opt(sbi, ERRORS_RO)) {
                        printk(KERN_CRIT "Remounting filesystem read-only\n");
+                       down_write(&nilfs->ns_super_sem);
                        sb->s_flags |= MS_RDONLY;
+                       up_write(&nilfs->ns_super_sem);
                }
        }
 
-- 
1.5.6.5

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