Commit 080f6276 authored by Eric W. Biederman's avatar Eric W. Biederman
Browse files

proc: In proc_prune_siblings_dcache cache an aquired super block 



Because there are likely to be several sysctls in a row on the
same superblock cache the super_block after the count has
been raised and don't deactivate it until we are processing
another super_block.

Signed-off-by: default avatar"Eric W. Biederman" <ebiederm@xmission.com>
parent 26dbc60f

fs/proc/inode.c

+10 −4
Original line number Diff line number Diff line
@@ -108,10 +108,11 @@ void proc_prune_siblings_dcache(struct hlist_head *inodes, spinlock_t *lock) 
	struct inode *inode;

	struct proc_inode *ei;

	struct hlist_node *node;

	struct super_block *sb;

	struct super_block *old_sb = NULL;



	rcu_read_lock();

	for (;;) {

		struct super_block *sb;

		node = hlist_first_rcu(inodes);

		if (!node)

			break;
@@ -122,23 +123,28 @@ void proc_prune_siblings_dcache(struct hlist_head *inodes, spinlock_t *lock) 


		inode = &ei->vfs_inode;

		sb = inode->i_sb;

		if (!atomic_inc_not_zero(&sb->s_active))

		if ((sb != old_sb) && !atomic_inc_not_zero(&sb->s_active))

			continue;

		inode = igrab(inode);

		rcu_read_unlock();

		if (sb != old_sb) {

			if (old_sb)

				deactivate_super(old_sb);

			old_sb = sb;

		}

		if (unlikely(!inode)) {

			deactivate_super(sb);

			rcu_read_lock();

			continue;

		}



		d_prune_aliases(inode);

		iput(inode);

		deactivate_super(sb);



		rcu_read_lock();

	}

	rcu_read_unlock();

	if (old_sb)

		deactivate_super(old_sb);

}



static int proc_show_options(struct seq_file *seq, struct dentry *root)

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