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fs: rcu-walk aware d_revalidate method

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Require filesystems be aware of .d_revalidate being called in rcu-walk
mode (nd->flags & LOOKUP_RCU). For now do a simple push down, returning
-ECHILD from all implementations.

Signed-off-by: Nick Piggin <[email protected]>
This commit is contained in:
Nick Piggin 2011-01-07 17:49:57 +11:00
commit 34286d6662
27 changed files with 215 additions and 61 deletions
Download patch file Download diff file Expand all files Collapse all files

33
fs/proc/base.c
View file

@ -1719,10 +1719,16 @@ static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat
*/
static int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
{
struct inode *inode = dentry->d_inode;
struct task_struct *task = get_proc_task(inode);
struct inode *inode;
struct task_struct *task;
const struct cred *cred;
if (nd && nd->flags & LOOKUP_RCU)
return -ECHILD;
inode = dentry->d_inode;
task = get_proc_task(inode);
if (task) {
if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
task_dumpable(task)) {
@ -1888,12 +1894,19 @@ static int proc_fd_link(struct inode *inode, struct path *path)
static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
{
struct inode *inode = dentry->d_inode;
struct task_struct *task = get_proc_task(inode);
int fd = proc_fd(inode);
struct inode *inode;
struct task_struct *task;
int fd;
struct files_struct *files;
const struct cred *cred;
if (nd && nd->flags & LOOKUP_RCU)
return -ECHILD;
inode = dentry->d_inode;
task = get_proc_task(inode);
fd = proc_fd(inode);
if (task) {
files = get_files_struct(task);
if (files) {
@ -2563,8 +2576,14 @@ static const struct pid_entry proc_base_stuff[] = {
*/
static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd)
{
struct inode *inode = dentry->d_inode;
struct task_struct *task = get_proc_task(inode);
struct inode *inode;
struct task_struct *task;
if (nd->flags & LOOKUP_RCU)
return -ECHILD;
inode = dentry->d_inode;
task = get_proc_task(inode);
if (task) {
put_task_struct(task);
return 1;

3
fs/proc/proc_sysctl.c
View file

@ -5,6 +5,7 @@
#include <linux/sysctl.h>
#include <linux/proc_fs.h>
#include <linux/security.h>
#include <linux/namei.h>
#include "internal.h"
static const struct dentry_operations proc_sys_dentry_operations;
@ -389,6 +390,8 @@ static const struct inode_operations proc_sys_dir_operations = {
static int proc_sys_revalidate(struct dentry *dentry, struct nameidata *nd)
{
if (nd->flags & LOOKUP_RCU)
return -ECHILD;
return !PROC_I(dentry->d_inode)->sysctl->unregistering;
}