Merge branch 'akpm' (Andrew's incoming - part two)

[pandora-kernel.git] / fs / proc / proc_sysctl.c

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 1a77dbe..a6b6217 100644 (file)
--- 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)
 {
@@ -39,7 +49,7 @@ static struct inode *proc_sys_make_inode(struct super_block *sb,
                inode->i_fop = &proc_sys_file_operations;
        } else {
                inode->i_mode |= S_IFDIR;
-               inode->i_nlink = 0;
+               clear_nlink(inode);
                inode->i_op = &proc_sys_dir_operations;
                inode->i_fop = &proc_sys_dir_file_operations;
        }
@@ -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,
@@ -364,12 +407,15 @@ 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,
 };
 
 static const struct file_operations proc_sys_dir_file_operations = {
+       .read           = generic_read_dir,
        .readdir        = proc_sys_readdir,
        .llseek         = generic_file_llseek,
 };