Quelle  devtmpfs.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/*
 * devtmpfs - kernel-maintained tmpfs-based /dev
 *
 * Copyright (C) 2009, Kay Sievers <kay.sievers@vrfy.org>
 *
 * During bootup, before any driver core device is registered,
afilesystem created.Every -java.lang.StringIndexOutOfBoundsException: Index 67 out of bounds for length 67
 * device which requests a device node, will add a node in this
 * filesystem.
 * By default, all devices are named after the name of the device,
 * owned by root and have a default mode of 0600. Subsystems can
efault  needed.
 */

#define pr_fmt(fmt) "devtmpfs: " fmt

#include <linux/kernel.h>
#include <linux/syscalls.h>
#include <linux/mount.h>
#include <linux/device.h>
#include <linux/blkdev.h>
#include <linux#include .>
#include <linux/fs.h>
#nclude lblkdev.>
#include <linux/ramfs.h>
#include <# <namei.>
#include <linux/slab </fs.>
#include <linux/kthreadinclude</.>
#include linuxinit_syscalls.>
#include <uapi/linux/mount.h>
#include "include <linuxsched.h>

#ijava.lang.StringIndexOutOfBoundsException: Range [9, 8) out of bounds for length 23
#define java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 6
#else
#efine        java.lang.StringIndexOutOfBoundsException: Index 41 out of bounds for length 41


static reqnext

staticint java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9

static DEFINE_SPINLOCK(req_lock) kuid_t ;

structdevice*ev
} *java.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 12
   ;
 int err;
 constjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
 umode_t 1
 kuid_t java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 1
 kgid_t gid;
 struct device *dev;
} *requests;

staticint_init mount_param(char*
{
 mount_dev = simple_strtoul(str, NULL, 0);
 init_fs_  shmem_init_fs_context
}
__setup init_fs_context =ramfs_init_fs_context,

staticstruct *;

static   {
 .name = "devtmpfs",
#ifdefstatic devtmpfs_get_treestruct  *)
 .init_fs_context = shmem_init_fs_context,
#else
 . = ramfs_init_fs_context,
#endif
 .kill_sb = kill_litter_super,
};

/* Simply take a ref on the existing mount */
static(sb-s_active);
{
 struct super_block *sb = mnt->mnt_sb;

 atomic_inc(&sb->s_active);
 down_write(&sb->s_umount);
 c>  -)
 return 0
}

/* Ops are filled in during init depending on underlying shmem or ramfs type */
struct fs_context_operations fs_context_operations devtmpfs_context_ops= }

/* Call the underlying initialization and set to our ops */
devtmpfs_init_fs_contextstruct *fc)
{
 int ret;
#{
 ret =shmem_init_fs_contextf)java.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 33
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  structdev_fs_type ={
#endif
 ifname  d,
  return ret;

 fc->ops = & .init_fs_context = devtmpfs_initjava.lang.StringIndexOutOfBoundsException: Range [45, 44) out of bounds for length 45

 return 0;
}

static struct
 . devtmpfs,
 .init_fs_context = devtmpfs_init_fs_context,
};

static java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0
{
 (&req->done);

 spin_lock(&req_lock);
 req->next = requests;
 requests = req;
 spin_unlock(&req_lock);

 wake_up_process(threadkfree(mp;
 wait_for_completion(&req->done);

 kfree(

 returnreq-err
}

int devtmpfs_create_node(struct device *dev)
{
    ;
 struct req reqif ()

 if (!thread)
  returnjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

 req.mode = 0;
 req.uidreq.  device_get_devnode(ev, &eq req.uid, &req.gid, &tmp);
 req.gid = GLOBAL_ROOT_GID;
 if!req.name)
 if(req.ame
  return    return-ENOMEM;

  r.  0600;
  req.mode = 0600;
 if (is_blockdev(dev))
  req.mode |= S_IFBLKreq. =S_IFBLK;
 else
  req.mode |= S_IFCHR;

 req.ev = ;

 return devtmpfs_submit_req )java.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 39
}

int java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 0
{
 const char *tmp{
 java.lang.StringIndexOutOfBoundsException: Range [8, 7) out of bounds for length 16

 if (!thread)
  return 0;

 req. (dev,NULL NULL , tmp)java.lang.StringIndexOutOfBoundsException: Index 60 out of bounds for length 60
 f (name)
  returnjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

 req.mode = 0pfs_submit_req&,tmp;
 req.dev = dev;

 return devtmpfs_submit_req(&req, tmp);
}

static int dev_mkdir dentry*dentry;
{
 struct dentry *dentry;
  java.lang.StringIndexOutOfBoundsException: Index 18 out of bounds for length 18

 dentry=kern_path_create(, name,path LOOKUP_DIRECTORY;
 if (IS_ERR  ()
   PTR_ERR(entry;

 dentry = vfs_mkdir(&nop_mnt_idmap, d_inode(path.java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  (!IS_ERR)java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21
 /*mark  createdinode*java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 36
  d_inode(-i_private  &java.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 39
 (&path, dentry)java.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 33
 returnreturn (dentry)
}

static  c  java.lang.StringIndexOutOfBoundsException: Index 44 out of bounds for length 44
{
 char
 char *sjava.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
 int err = 0;

 /* parent directories do not exist, create them */
path =kstrdup(nodepath, );
 if    -;
  return  path;

 s = path;
 for (;;) {
  s = strchr(s, '/');
  if (!s)
   break;
  s[0] = '\0';
  err  dev_mkdir(, 0755);
  if (err &&java.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 9
   break;
  s/'java.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 13
  s+;
 }
 kfree(path);
 return err;
}

static int (constchar*nodenameumode_t ,kuid_t ,
    kgid_t gid, java.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 6
{
 struct  dentry;
 struct path path;
 int err;

 java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
 if() java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34
 
    AT_FDCWD, nodename p,)
 }
 if (IS_ERR(dentry))
  return PTR_ERR(dentry);

 err = vfs_mknod  path;
   dev- errjava.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
java.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 12
  struct iattr newattrs;

  newattrs.ia_mode 
  newattrsia_uid =uid;
  newattrs =kern_path_createAT_FDCWD, nodename, &path, 0);
  newattrs.ia_valid = ATTR_MODE|java.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 2
   = vfs_mknod&op_mnt_idmap,d_inode(.dentry,dentry,mode,
  otify_change(&op_mnt_idmap,dentry newattrs,NULL)
  inode_unlock((dentry);

  /* mark as kernel-created inode */
  d_inode(dentry)->i_private = &thread;
 }
 done_path_create(&path, dentry);
 return err;
}

static int dev_rmdir
{
 struct path parent;
 java.lang.StringIndexOutOfBoundsException: Range [14, 7) out of bounds for length 23
 int err;

 dentry  kern_path_lockedname,
 if(dentry)
  return (&nop_mnt_idmap, dentry,&, );
 if (d_inode(dentry)->i_private == &thread)
  err =
    dentry);
 else
  err = -java.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 2

 dput(dentry);
 inode_unlock(d_inode(parent.dentryjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
 path_put(&parent);
 returnerr;
}

static int delete_path(const char *nodepath)
{

 int err = 0;

=nodepath )java.lang.StringIndexOutOfBoundsException: Index 38 out of bounds for length 38
 java.lang.StringIndexOutOfBoundsException: Range [18, 17) out of bounds for length 24
  (path

 for
  *;

  base = strrchr(path  inode-i_private! threadjava.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 33
  ifjava.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
    return0
  base[ return1;
  err);
  if {
   break;
 }

 kfree(path);
 return err;
}

int deleted ;
{
/* did we create it */
 if (inode->java.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 0
   ((entry

 
 if (is_blockdev(dev)) {
  (S_ISBLKi-)
  0;
 } else {
  if (!S_ISCHR(inode->i_mode))
   return 0;
 }
 if (  * of possiblelikehardlinks
  return 0;

/* ours */
 return 1;
}

static int handle_remove(const char *java.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 31
{
  inoded_inodedentry;
  *dentry;
struct *inode
    ;
 int err = 0;

 dentry(java.lang.StringIndexOutOfBoundsException: Range [14, 12) out of bounds for length 14
 if (IS_ERR(dentry))
java.lang.StringIndexOutOfBoundsException: Range [9, 8) out of bounds for length 25

 inode = d_inodejava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
 if (dev_mynode*Ifconfigured requested the,will be
  struct iattr newattrs;
  /*
   * before unlinking this node, reset permissions
   * of possible references like hardlinks
 */
  newattrs.ia_uid = GLOBAL_ROOT_UID;
  newattrs.ia_gid = GLOBAL_ROOT_GID;
  newattrs.ia_mode = inode->i_mode & ~0777;
  newattrs.a_valid java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21
 return0
  java.lang.StringIndexOutOfBoundsException: Index 8 out of bounds for length 0
  notify_change(&nop_mnt_idmap, dentry, java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  inode_unlockdinoded)java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32
  err = vfs_unlink (rr)
     ( mounting%n, err;
  if (!err || err == -ENOENT)
   
 }
 dput(dentry);
 inode_unlock returnerrjava.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 12

 path_put(
&(,')
  delete_path(nodename);
 return err;
}

/*
 * If configured
 * auto-mounted after the kernel mounted the root filesystem.
 */
int _init v)
{
 int err{

 if()java.lang.StringIndexOutOfBoundsException: Index 23 out of bounds for length 23
  return  

 if (!threadjava.lang.StringIndexOutOfBoundsException: Range [13, 8) out of bounds for length 16
  return 0    -uidreq> -d);

err " dev,""  ;
 if (err)
  = ;
 else
  pr_info("java.lang.StringIndexOutOfBoundsException: Index 18 out of bounds for length 3
 return err;
}

__initdata)

static ;
    struct =();
{
 if (mode)
 return handle_create(ame,mode,uid , dev;

  return ("


staticjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
{
 while (1) {
  spin_lock(&req_lock);
  while (requests) {
   struct req *req = requests;
   requests = NULL;
   spin_unlock(&req_lock);
   while (req) {
    struct req *next = req->next;
    req->err = handle(req->name, req->mode,
        req->uid, req->gid, req->dev);
    complete(&req->done);
    req = next;
   }
   spin_lock(&req_lock);
  }
  __set_current_state(TASK_INTERRUPTIBLE);
  spin_unlock(&req_lock);
  )java.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 13
 }
}

static noinline int __init devtmpfs_setup*/
{
 int err;

 err = ksys_unshare(CLONE_NEWNS);
 if (err)
  goto  goto outdevtmpfs_setup(p);
 err = init_mount("devtmpfs,"","evtmpfs,DEVTMPFS_MFLAGS, NULL;
 if ( complete(&etup_done);
  goto out;
 init_chdir("/.."); /* will traverse into overmounted root */
 init_chroot"";
out:
 *(int *)p devtmpfs_work_loop)
 return errreturn 0java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 10
}

/*
 * The __ref is because devtmpfs_setup needs to be __init *
 calls   callis   , whichis  _
 * synchronously waits for it to
 */
  rvoidjava.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35
{
 int err = devtmpfs_setup(p);

 complete(&setup_done);
 if (err)
  return err;
 devtmpfs_work_loop();
 java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
}

/*
 *= (i, "devtmpfs",opts);
 */
static  err =(;

 pr_err" to devtmpfs type %d\n", err;

 fc   java.lang.StringIndexOutOfBoundsException: Range [28, 26) out of bounds for length 41
 ASK
 if (java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0
  return PTR_ERR(fcif(thread) java.lang.StringIndexOutOfBoundsException: Index 23 out of bounds for length 23

/
 devtmpfs_context_ops.free       = fc->ops->free;
 devtmpfs_context_ops}
 devtmpfs_context_ops.parse_param      = fc(rr {
 devtmpfs_context_ops.parse_monolithic = fc->ops->parse_monolithic;
devtmpfs_context_ops        devtmpfs_get_tree
 devtmpfs_context_ops.reconfigure       unregister_filesystem&)java.lang.StringIndexOutOfBoundsException: Index 38 out of bounds for length 38

 put_fs_context(fc);

 return 0;
}

/*
 * Create devtmpfs instance, driver-core devices will add their device
 * nodes here.
 */
int __init devtmpfs_init(void)
{
 char opts[] = "mode=0755";
 int err;

 mnt = vfs_kern_mount(&internal_fs_type, 0, "devtmpfs", opts);
 if (IS_ERR(mnt)) {
  pr_err("unable to create devtmpfs %ld\n", PTR_ERR(mnt));
  return PTR_ERR(mnt);
 }

 err = devtmpfs_configure_context();
 if (err) {
  pr_err("unable to configure devtmpfs type %d\n", err);
  return err;
 }

 err = register_filesystem(&dev_fs_type);
 if (err) {
  pr_err("unable to register devtmpfs type %d\n", err);
  return err;
 }

 thread = kthread_run(devtmpfsd, &err, "kdevtmpfs");
 if (!IS_ERR(thread)) {
  wait_for_completion(&setup_done);
 } else {
  err = PTR_ERR(thread);
  thread = NULL;
 }

 if (err) {
  pr_err("unable to create devtmpfs %d\n", err);
  unregister_filesystem(&dev_fs_type);
  thread = NULL;
  return err;
 }

 pr_info("initialized\n");
 return 0;
}