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-rw-r--r--fs/proc/generic.c23
1 files changed, 22 insertions, 1 deletions
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index 04c4804cbdef..2078e70e1595 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -15,6 +15,7 @@
#include <linux/stat.h>
#include <linux/mm.h>
#include <linux/module.h>
+#include <linux/namei.h>
#include <linux/slab.h>
#include <linux/printk.h>
#include <linux/mount.h>
@@ -217,6 +218,26 @@ void proc_free_inum(unsigned int inum)
ida_simple_remove(&proc_inum_ida, inum - PROC_DYNAMIC_FIRST);
}
+static int proc_misc_d_revalidate(struct dentry *dentry, unsigned int flags)
+{
+ if (flags & LOOKUP_RCU)
+ return -ECHILD;
+
+ if (atomic_read(&PDE(d_inode(dentry))->in_use) < 0)
+ return 0; /* revalidate */
+ return 1;
+}
+
+static int proc_misc_d_delete(const struct dentry *dentry)
+{
+ return atomic_read(&PDE(d_inode(dentry))->in_use) < 0;
+}
+
+static const struct dentry_operations proc_misc_dentry_ops = {
+ .d_revalidate = proc_misc_d_revalidate,
+ .d_delete = proc_misc_d_delete,
+};
+
/*
* Don't create negative dentries here, return -ENOENT by hand
* instead.
@@ -234,7 +255,7 @@ struct dentry *proc_lookup_de(struct inode *dir, struct dentry *dentry,
inode = proc_get_inode(dir->i_sb, de);
if (!inode)
return ERR_PTR(-ENOMEM);
- d_set_d_op(dentry, &simple_dentry_operations);
+ d_set_d_op(dentry, &proc_misc_dentry_ops);
d_add(dentry, inode);
return NULL;
}