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Make sure that all callers of remount hold s_umount exclusive
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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5af7926ff3
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1 changed files with 3 additions and 2 deletions
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@ -579,7 +579,7 @@ static void do_emergency_remount(struct work_struct *work)
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list_for_each_entry(sb, &super_blocks, s_list) {
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sb->s_count++;
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spin_unlock(&sb_lock);
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down_read(&sb->s_umount);
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down_write(&sb->s_umount);
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if (sb->s_root && sb->s_bdev && !(sb->s_flags & MS_RDONLY)) {
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/*
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* ->remount_fs needs lock_kernel().
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@ -590,7 +590,8 @@ static void do_emergency_remount(struct work_struct *work)
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do_remount_sb(sb, MS_RDONLY, NULL, 1);
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unlock_kernel();
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}
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drop_super(sb);
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up_write(&sb->s_umount);
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put_super(sb);
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spin_lock(&sb_lock);
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}
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spin_unlock(&sb_lock);
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