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Linux/fs/proc/thread_self.c

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  1 #include <linux/sched.h>
  2 #include <linux/slab.h>
  3 #include <linux/pid_namespace.h>
  4 #include "internal.h"
  5 
  6 /*
  7  * /proc/thread_self:
  8  */
  9 static int proc_thread_self_readlink(struct dentry *dentry, char __user *buffer,
 10                               int buflen)
 11 {
 12         struct pid_namespace *ns = dentry->d_sb->s_fs_info;
 13         pid_t tgid = task_tgid_nr_ns(current, ns);
 14         pid_t pid = task_pid_nr_ns(current, ns);
 15         char tmp[PROC_NUMBUF + 6 + PROC_NUMBUF];
 16         if (!pid)
 17                 return -ENOENT;
 18         sprintf(tmp, "%d/task/%d", tgid, pid);
 19         return readlink_copy(buffer, buflen, tmp);
 20 }
 21 
 22 static const char *proc_thread_self_get_link(struct dentry *dentry,
 23                                              struct inode *inode,
 24                                              struct delayed_call *done)
 25 {
 26         struct pid_namespace *ns = inode->i_sb->s_fs_info;
 27         pid_t tgid = task_tgid_nr_ns(current, ns);
 28         pid_t pid = task_pid_nr_ns(current, ns);
 29         char *name;
 30 
 31         if (!pid)
 32                 return ERR_PTR(-ENOENT);
 33         name = kmalloc(PROC_NUMBUF + 6 + PROC_NUMBUF,
 34                                 dentry ? GFP_KERNEL : GFP_ATOMIC);
 35         if (unlikely(!name))
 36                 return dentry ? ERR_PTR(-ENOMEM) : ERR_PTR(-ECHILD);
 37         sprintf(name, "%d/task/%d", tgid, pid);
 38         set_delayed_call(done, kfree_link, name);
 39         return name;
 40 }
 41 
 42 static const struct inode_operations proc_thread_self_inode_operations = {
 43         .readlink       = proc_thread_self_readlink,
 44         .get_link       = proc_thread_self_get_link,
 45 };
 46 
 47 static unsigned thread_self_inum;
 48 
 49 int proc_setup_thread_self(struct super_block *s)
 50 {
 51         struct inode *root_inode = d_inode(s->s_root);
 52         struct pid_namespace *ns = s->s_fs_info;
 53         struct dentry *thread_self;
 54 
 55         inode_lock(root_inode);
 56         thread_self = d_alloc_name(s->s_root, "thread-self");
 57         if (thread_self) {
 58                 struct inode *inode = new_inode_pseudo(s);
 59                 if (inode) {
 60                         inode->i_ino = thread_self_inum;
 61                         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
 62                         inode->i_mode = S_IFLNK | S_IRWXUGO;
 63                         inode->i_uid = GLOBAL_ROOT_UID;
 64                         inode->i_gid = GLOBAL_ROOT_GID;
 65                         inode->i_op = &proc_thread_self_inode_operations;
 66                         d_add(thread_self, inode);
 67                 } else {
 68                         dput(thread_self);
 69                         thread_self = ERR_PTR(-ENOMEM);
 70                 }
 71         } else {
 72                 thread_self = ERR_PTR(-ENOMEM);
 73         }
 74         inode_unlock(root_inode);
 75         if (IS_ERR(thread_self)) {
 76                 pr_err("proc_fill_super: can't allocate /proc/thread_self\n");
 77                 return PTR_ERR(thread_self);
 78         }
 79         ns->proc_thread_self = thread_self;
 80         return 0;
 81 }
 82 
 83 void __init proc_thread_self_init(void)
 84 {
 85         proc_alloc_inum(&thread_self_inum);
 86 }
 87 

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