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authorAl Viro <viro@zeniv.linux.org.uk>2009-05-05 23:48:50 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2009-06-11 21:36:07 -0400
commit443b94baaa16771e98b29ca7c24f1e305738ffca (patch)
treecf498a25d012330928e0315222c46ea90c200530
parent5af7926ff33b68b3ba46531471c6e0564b285efc (diff)
downloadlinux-443b94baaa16771e98b29ca7c24f1e305738ffca.tar.bz2
Make sure that all callers of remount hold s_umount exclusive
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/super.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/super.c b/fs/super.c
index cb19fffc7681..49f670cb9a83 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -579,7 +579,7 @@ static void do_emergency_remount(struct work_struct *work)
list_for_each_entry(sb, &super_blocks, s_list) {
sb->s_count++;
spin_unlock(&sb_lock);
- down_read(&sb->s_umount);
+ down_write(&sb->s_umount);
if (sb->s_root && sb->s_bdev && !(sb->s_flags & MS_RDONLY)) {
/*
* ->remount_fs needs lock_kernel().
@@ -590,7 +590,8 @@ static void do_emergency_remount(struct work_struct *work)
do_remount_sb(sb, MS_RDONLY, NULL, 1);
unlock_kernel();
}
- drop_super(sb);
+ up_write(&sb->s_umount);
+ put_super(sb);
spin_lock(&sb_lock);
}
spin_unlock(&sb_lock);