sysctl: add support for poll()

Adding support for poll() in sysctl fs allows userspace to receive
notifications of changes in sysctl entries.  This adds a infrastructure to
allow files in sysctl fs to be pollable and implements it for hostname and
domainname.

[akpm@linux-foundation.org: s/declare/define/ for definitions]
Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
Cc: Greg KH <gregkh@suse.de>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 45 insertions, 0 deletions

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index dacd840a675a..df594803f45a 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -3,6 +3,7 @@
  */
 #include <linux/init.h>
 #include <linux/sysctl.h>
+#include <linux/poll.h>
 #include <linux/proc_fs.h>
 #include <linux/security.h>
 #include <linux/namei.h>
@@ -14,6 +15,15 @@ static const struct inode_operations proc_sys_inode_operations;
 static const struct file_operations proc_sys_dir_file_operations;
 static const struct inode_operations proc_sys_dir_operations;
 
+void proc_sys_poll_notify(struct ctl_table_poll *poll)
+{
+        if (!poll)
+                return;
+
+        atomic_inc(&poll->event);
+        wake_up_interruptible(&poll->wait);
+}
+
 static struct inode *proc_sys_make_inode(struct super_block *sb,
                 struct ctl_table_header *head, struct ctl_table *table)
 {
@@ -176,6 +186,39 @@ static ssize_t proc_sys_write(struct file *filp, const char __user *buf,
         return proc_sys_call_handler(filp, (void __user *)buf, count, ppos, 1);
 }
 
+static int proc_sys_open(struct inode *inode, struct file *filp)
+{
+        struct ctl_table *table = PROC_I(inode)->sysctl_entry;
+
+        if (table->poll)
+                filp->private_data = proc_sys_poll_event(table->poll);
+
+        return 0;
+}
+
+static unsigned int proc_sys_poll(struct file *filp, poll_table *wait)
+{
+        struct inode *inode = filp->f_path.dentry->d_inode;
+        struct ctl_table *table = PROC_I(inode)->sysctl_entry;
+        unsigned long event = (unsigned long)filp->private_data;
+        unsigned int ret = DEFAULT_POLLMASK;
+
+        if (!table->proc_handler)
+                goto out;
+
+        if (!table->poll)
+                goto out;
+
+        poll_wait(filp, &table->poll->wait, wait);
+
+        if (event != atomic_read(&table->poll->event)) {
+                filp->private_data = proc_sys_poll_event(table->poll);
+                ret = POLLIN | POLLRDNORM | POLLERR | POLLPRI;
+        }
+
+out:
+        return ret;
+}
 
 static int proc_sys_fill_cache(struct file *filp, void *dirent,
                                 filldir_t filldir,
@@ -364,6 +407,8 @@ static int proc_sys_getattr(struct vfsmount *mnt, struct dentry *dentry, struct
 }
 
 static const struct file_operations proc_sys_file_operations = {
+        .open           = proc_sys_open,
+        .poll           = proc_sys_poll,
         .read           = proc_sys_read,
         .write          = proc_sys_write,
         .llseek         = default_llseek,