Gitweb: http://git.kernel.org/linus/443b94baaa16771e98b29ca7c24f1e305738ffca
Commit: 443b94baaa16771e98b29ca7c24f1e305738ffca
Parent: 5af7926ff33b68b3ba46531471c6e0564b285efc
Author: Al Viro <viro@zeniv.linux.org.uk>
AuthorDate: Tue May 5 23:48:50 2009 -0400
Committer: Al Viro <viro@zeniv.linux.org.uk>
CommitDate: Thu Jun 11 21:36:07 2009 -0400
Make sure that all callers of remount hold s_umount exclusive
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/super.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/super.c b/fs/super.c
index cb19fff..49f670c 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);
--
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