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procfs: switch /proc/self away from proc_dir_entry

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Just have it pinned in dcache all along and let procfs ->kill_sb()
drop it before kill_anon_super().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2013-03-29 19:27:05 -04:00
parent 0ecc833bac
commit 021ada7dff
6 changed files with 56 additions and 12 deletions
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46
fs/proc/self.c
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@@ -1,6 +1,7 @@
#include <linux/proc_fs.h>
#include <linux/sched.h>
#include <linux/namei.h>
#include <linux/pid_namespace.h>
#include "internal.h"
/*
* /proc/self:
@@ -48,12 +49,43 @@ static const struct inode_operations proc_self_inode_operations = {
.put_link = proc_self_put_link,
};
static unsigned self_inum;
int proc_setup_self(struct super_block *s)
{
struct inode *root_inode = s->s_root->d_inode;
struct pid_namespace *ns = s->s_fs_info;
struct dentry *self;
mutex_lock(&root_inode->i_mutex);
self = d_alloc_name(s->s_root, "self");
if (self) {
struct inode *inode = new_inode_pseudo(s);
if (inode) {
inode->i_ino = self_inum;
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
inode->i_mode = S_IFLNK | S_IRWXUGO;
inode->i_uid = GLOBAL_ROOT_UID;
inode->i_gid = GLOBAL_ROOT_GID;
inode->i_op = &proc_self_inode_operations;
d_add(self, inode);
} else {
dput(self);
self = ERR_PTR(-ENOMEM);
}
} else {
self = ERR_PTR(-ENOMEM);
}
mutex_unlock(&root_inode->i_mutex);
if (IS_ERR(self)) {
pr_err("proc_fill_super: can't allocate /proc/self\n");
return PTR_ERR(self);
}
ns->proc_self = self;
return 0;
}
void __init proc_self_init(void)
{
struct proc_dir_entry *proc_self_symlink;
umode_t mode;
mode = S_IFLNK | S_IRWXUGO;
proc_self_symlink = proc_create("self", mode, NULL, NULL );
proc_self_symlink->proc_iops = &proc_self_inode_operations;
proc_alloc_inum(&self_inum);
}