From 021ada7dff22d0d9540ff596cb0f8bb866755ee1 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Fri, 29 Mar 2013 19:27:05 -0400 Subject: procfs: switch /proc/self away from proc_dir_entry Just have it pinned in dcache all along and let procfs ->kill_sb() drop it before kill_anon_super(). Signed-off-by: Al Viro --- fs/proc/self.c | 46 +++++++++++++++++++++++++++++++++++++++------- 1 file changed, 39 insertions(+), 7 deletions(-) (limited to 'fs/proc/self.c') diff --git a/fs/proc/self.c b/fs/proc/self.c index d8a025296613..21940d89977e 100644 --- a/fs/proc/self.c +++ b/fs/proc/self.c @@ -1,6 +1,7 @@ -#include #include #include +#include +#include "internal.h" /* * /proc/self: @@ -48,12 +49,43 @@ static const struct inode_operations proc_self_inode_operations = { .put_link = proc_self_put_link, }; -void __init proc_self_init(void) +static unsigned self_inum; + +int proc_setup_self(struct super_block *s) { - struct proc_dir_entry *proc_self_symlink; - umode_t mode; + 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; +} - mode = S_IFLNK | S_IRWXUGO; - proc_self_symlink = proc_create("self", mode, NULL, NULL ); - proc_self_symlink->proc_iops = &proc_self_inode_operations; +void __init proc_self_init(void) +{ + proc_alloc_inum(&self_inum); } -- cgit v1.2.2