Revert "writeback: fix WB_SYNC_NONE writeback from umount"

[safe/jmp/linux-2.6] / fs / proc / base.c

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 18d5cc6..c7f9f23 100644 (file)
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -81,6 +81,7 @@
 #include <linux/elf.h>
 #include <linux/pid_namespace.h>
 #include <linux/fs_struct.h>
+#include <linux/slab.h>
 #include "internal.h"
 
 /* NOTE:
@@ -442,12 +443,13 @@ static const struct file_operations proc_lstats_operations = {
 unsigned long badness(struct task_struct *p, unsigned long uptime);
 static int proc_oom_score(struct task_struct *task, char *buffer)
 {
-       unsigned long points;
+       unsigned long points = 0;
        struct timespec uptime;
 
        do_posix_clock_monotonic_gettime(&uptime);
        read_lock(&tasklist_lock);
-       points = badness(task->group_leader, uptime.tv_sec);
+       if (pid_alive(task))
+               points = badness(task, uptime.tv_sec);
        read_unlock(&tasklist_lock);
        return sprintf(buffer, "%lu\n", points);
 }
@@ -647,17 +649,11 @@ static int mounts_release(struct inode *inode, struct file *file)
 static unsigned mounts_poll(struct file *file, poll_table *wait)
 {
        struct proc_mounts *p = file->private_data;
-       struct mnt_namespace *ns = p->ns;
        unsigned res = POLLIN | POLLRDNORM;
 
-       poll_wait(file, &ns->poll, wait);
-
-       spin_lock(&vfsmount_lock);
-       if (p->event != ns->event) {
-               p->event = ns->event;
+       poll_wait(file, &p->ns->poll, wait);
+       if (mnt_had_events(p))
                res |= POLLERR | POLLPRI;
-       }
-       spin_unlock(&vfsmount_lock);
 
        return res;
 }
@@ -734,6 +730,7 @@ out_no_task:
 
 static const struct file_operations proc_info_file_operations = {
        .read           = proc_info_read,
+       .llseek         = generic_file_llseek,
 };
 
 static int proc_single_show(struct seq_file *m, void *v)
@@ -991,6 +988,7 @@ out_no_task:
 
 static const struct file_operations proc_environ_operations = {
        .read           = environ_read,
+       .llseek         = generic_file_llseek,
 };
 
 static ssize_t oom_adjust_read(struct file *file, char __user *buf,
@@ -1064,6 +1062,7 @@ static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
 static const struct file_operations proc_oom_adjust_operations = {
        .read           = oom_adjust_read,
        .write          = oom_adjust_write,
+       .llseek         = generic_file_llseek,
 };
 
 #ifdef CONFIG_AUDITSYSCALL
@@ -1095,8 +1094,12 @@ static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
        if (!capable(CAP_AUDIT_CONTROL))
                return -EPERM;
 
-       if (current != pid_task(proc_pid(inode), PIDTYPE_PID))
+       rcu_read_lock();
+       if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) {
+               rcu_read_unlock();
                return -EPERM;
+       }
+       rcu_read_unlock();
 
        if (count >= PAGE_SIZE)
                count = PAGE_SIZE - 1;
@@ -1131,6 +1134,7 @@ out_free_page:
 static const struct file_operations proc_loginuid_operations = {
        .read           = proc_loginuid_read,
        .write          = proc_loginuid_write,
+       .llseek         = generic_file_llseek,
 };
 
 static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
@@ -1151,6 +1155,7 @@ static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
 
 static const struct file_operations proc_sessionid_operations = {
        .read           = proc_sessionid_read,
+       .llseek         = generic_file_llseek,
 };
 #endif
 
@@ -1202,6 +1207,7 @@ static ssize_t proc_fault_inject_write(struct file * file,
 static const struct file_operations proc_fault_inject_operations = {
        .read           = proc_fault_inject_read,
        .write          = proc_fault_inject_write,
+       .llseek         = generic_file_llseek,
 };
 #endif
 
@@ -1419,7 +1425,6 @@ static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
                goto out;
 
        error = PROC_I(inode)->op.proc_get_link(inode, &nd->path);
-       nd->last_type = LAST_BIND;
 out:
        return ERR_PTR(error);
 }
@@ -1944,7 +1949,7 @@ static ssize_t proc_fdinfo_read(struct file *file, char __user *buf,
 }
 
 static const struct file_operations proc_fdinfo_file_operations = {
-       .open           = nonseekable_open,
+       .open           = nonseekable_open,
        .read           = proc_fdinfo_read,
 };
 
@@ -2228,6 +2233,7 @@ out_no_task:
 static const struct file_operations proc_pid_attr_operations = {
        .read           = proc_pid_attr_read,
        .write          = proc_pid_attr_write,
+       .llseek         = generic_file_llseek,
 };
 
 static const struct pid_entry attr_dir_stuff[] = {
@@ -2348,6 +2354,7 @@ static ssize_t proc_coredump_filter_write(struct file *file,
 static const struct file_operations proc_coredump_filter_operations = {
        .read           = proc_coredump_filter_read,
        .write          = proc_coredump_filter_write,
+       .llseek         = generic_file_llseek,
 };
 #endif
 
@@ -2370,16 +2377,30 @@ static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
 {
        struct pid_namespace *ns = dentry->d_sb->s_fs_info;
        pid_t tgid = task_tgid_nr_ns(current, ns);
-       char tmp[PROC_NUMBUF];
-       if (!tgid)
-               return ERR_PTR(-ENOENT);
-       sprintf(tmp, "%d", task_tgid_nr_ns(current, ns));
-       return ERR_PTR(vfs_follow_link(nd,tmp));
+       char *name = ERR_PTR(-ENOENT);
+       if (tgid) {
+               name = __getname();
+               if (!name)
+                       name = ERR_PTR(-ENOMEM);
+               else
+                       sprintf(name, "%d", tgid);
+       }
+       nd_set_link(nd, name);
+       return NULL;
+}
+
+static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd,
+                               void *cookie)
+{
+       char *s = nd_get_link(nd);
+       if (!IS_ERR(s))
+               __putname(s);
 }
 
 static const struct inode_operations proc_self_inode_operations = {
        .readlink       = proc_self_readlink,
        .follow_link    = proc_self_follow_link,
+       .put_link       = proc_self_put_link,
 };
 
 /*
@@ -2896,7 +2917,7 @@ out_no_task:
  */
 static const struct pid_entry tid_base_stuff[] = {
        DIR("fd",        S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
-       DIR("fdinfo",    S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fd_operations),
+       DIR("fdinfo",    S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
        REG("environ",   S_IRUSR, proc_environ_operations),
        INF("auxv",      S_IRUSR, proc_pid_auxv),
        ONE("status",    S_IRUGO, proc_pid_status),