![Stephen Boyd](/assets/img/avatar_default.png)
Many users of debugfs copy the implementation of default_open() when they want to support a custom read/write function op. This leads to a proliferation of the default_open() implementation across the entire tree. Now that the common implementation has been consolidated into libfs we can replace all the users of this function with simple_open(). This replacement was done with the following semantic patch: <smpl> @ open @ identifier open_f != simple_open; identifier i, f; @@ -int open_f(struct inode *i, struct file *f) -{ ( -if (i->i_private) -f->private_data = i->i_private; | -f->private_data = i->i_private; ) -return 0; -} @ has_open depends on open @ identifier fops; identifier open.open_f; @@ struct file_operations fops = { ... -.open = open_f, +.open = simple_open, ... }; </smpl> [akpm@linux-foundation.org: checkpatch fixes] Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Julia Lawall <Julia.Lawall@lip6.fr> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
749 lines
17 KiB
C
749 lines
17 KiB
C
/*****************************************************************************/
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/*
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* inode.c -- Inode/Dentry functions for the USB device file system.
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*
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* Copyright (C) 2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
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* Copyright (C) 2001,2002,2004 Greg Kroah-Hartman (greg@kroah.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* History:
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* 0.1 04.01.2000 Created
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* 0.2 10.12.2001 converted to use the vfs layer better
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*/
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/*****************************************************************************/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include <linux/pagemap.h>
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#include <linux/init.h>
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#include <linux/proc_fs.h>
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#include <linux/usb.h>
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#include <linux/namei.h>
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#include <linux/usbdevice_fs.h>
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#include <linux/parser.h>
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#include <linux/notifier.h>
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#include <linux/seq_file.h>
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#include <linux/usb/hcd.h>
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#include <asm/byteorder.h>
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#include "usb.h"
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#define USBFS_DEFAULT_DEVMODE (S_IWUSR | S_IRUGO)
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#define USBFS_DEFAULT_BUSMODE (S_IXUGO | S_IRUGO)
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#define USBFS_DEFAULT_LISTMODE S_IRUGO
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static const struct file_operations default_file_operations;
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static struct vfsmount *usbfs_mount;
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static int usbfs_mount_count; /* = 0 */
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static struct dentry *devices_usbfs_dentry;
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static int num_buses; /* = 0 */
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static uid_t devuid; /* = 0 */
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static uid_t busuid; /* = 0 */
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static uid_t listuid; /* = 0 */
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static gid_t devgid; /* = 0 */
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static gid_t busgid; /* = 0 */
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static gid_t listgid; /* = 0 */
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static umode_t devmode = USBFS_DEFAULT_DEVMODE;
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static umode_t busmode = USBFS_DEFAULT_BUSMODE;
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static umode_t listmode = USBFS_DEFAULT_LISTMODE;
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static int usbfs_show_options(struct seq_file *seq, struct dentry *root)
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{
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if (devuid != 0)
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seq_printf(seq, ",devuid=%u", devuid);
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if (devgid != 0)
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seq_printf(seq, ",devgid=%u", devgid);
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if (devmode != USBFS_DEFAULT_DEVMODE)
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seq_printf(seq, ",devmode=%o", devmode);
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if (busuid != 0)
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seq_printf(seq, ",busuid=%u", busuid);
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if (busgid != 0)
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seq_printf(seq, ",busgid=%u", busgid);
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if (busmode != USBFS_DEFAULT_BUSMODE)
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seq_printf(seq, ",busmode=%o", busmode);
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if (listuid != 0)
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seq_printf(seq, ",listuid=%u", listuid);
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if (listgid != 0)
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seq_printf(seq, ",listgid=%u", listgid);
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if (listmode != USBFS_DEFAULT_LISTMODE)
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seq_printf(seq, ",listmode=%o", listmode);
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return 0;
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}
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enum {
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Opt_devuid, Opt_devgid, Opt_devmode,
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Opt_busuid, Opt_busgid, Opt_busmode,
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Opt_listuid, Opt_listgid, Opt_listmode,
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Opt_err,
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};
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static const match_table_t tokens = {
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{Opt_devuid, "devuid=%u"},
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{Opt_devgid, "devgid=%u"},
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{Opt_devmode, "devmode=%o"},
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{Opt_busuid, "busuid=%u"},
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{Opt_busgid, "busgid=%u"},
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{Opt_busmode, "busmode=%o"},
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{Opt_listuid, "listuid=%u"},
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{Opt_listgid, "listgid=%u"},
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{Opt_listmode, "listmode=%o"},
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{Opt_err, NULL}
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};
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static int parse_options(struct super_block *s, char *data)
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{
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char *p;
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int option;
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/* (re)set to defaults. */
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devuid = 0;
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busuid = 0;
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listuid = 0;
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devgid = 0;
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busgid = 0;
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listgid = 0;
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devmode = USBFS_DEFAULT_DEVMODE;
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busmode = USBFS_DEFAULT_BUSMODE;
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listmode = USBFS_DEFAULT_LISTMODE;
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while ((p = strsep(&data, ",")) != NULL) {
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substring_t args[MAX_OPT_ARGS];
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int token;
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if (!*p)
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continue;
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token = match_token(p, tokens, args);
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switch (token) {
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case Opt_devuid:
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if (match_int(&args[0], &option))
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return -EINVAL;
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devuid = option;
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break;
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case Opt_devgid:
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if (match_int(&args[0], &option))
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return -EINVAL;
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devgid = option;
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break;
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case Opt_devmode:
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if (match_octal(&args[0], &option))
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return -EINVAL;
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devmode = option & S_IRWXUGO;
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break;
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case Opt_busuid:
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if (match_int(&args[0], &option))
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return -EINVAL;
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busuid = option;
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break;
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case Opt_busgid:
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if (match_int(&args[0], &option))
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return -EINVAL;
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busgid = option;
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break;
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case Opt_busmode:
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if (match_octal(&args[0], &option))
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return -EINVAL;
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busmode = option & S_IRWXUGO;
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break;
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case Opt_listuid:
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if (match_int(&args[0], &option))
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return -EINVAL;
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listuid = option;
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break;
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case Opt_listgid:
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if (match_int(&args[0], &option))
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return -EINVAL;
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listgid = option;
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break;
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case Opt_listmode:
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if (match_octal(&args[0], &option))
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return -EINVAL;
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listmode = option & S_IRWXUGO;
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break;
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default:
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printk(KERN_ERR "usbfs: unrecognised mount option "
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"\"%s\" or missing value\n", p);
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return -EINVAL;
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}
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}
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return 0;
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}
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static void update_special(struct dentry *special)
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{
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special->d_inode->i_uid = listuid;
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special->d_inode->i_gid = listgid;
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special->d_inode->i_mode = S_IFREG | listmode;
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}
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static void update_dev(struct dentry *dev)
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{
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dev->d_inode->i_uid = devuid;
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dev->d_inode->i_gid = devgid;
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dev->d_inode->i_mode = S_IFREG | devmode;
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}
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static void update_bus(struct dentry *bus)
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{
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struct dentry *dev = NULL;
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bus->d_inode->i_uid = busuid;
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bus->d_inode->i_gid = busgid;
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bus->d_inode->i_mode = S_IFDIR | busmode;
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mutex_lock(&bus->d_inode->i_mutex);
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list_for_each_entry(dev, &bus->d_subdirs, d_u.d_child)
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if (dev->d_inode)
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update_dev(dev);
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mutex_unlock(&bus->d_inode->i_mutex);
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}
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static void update_sb(struct super_block *sb)
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{
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struct dentry *root = sb->s_root;
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struct dentry *bus = NULL;
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if (!root)
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return;
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mutex_lock_nested(&root->d_inode->i_mutex, I_MUTEX_PARENT);
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list_for_each_entry(bus, &root->d_subdirs, d_u.d_child) {
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if (bus->d_inode) {
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switch (S_IFMT & bus->d_inode->i_mode) {
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case S_IFDIR:
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update_bus(bus);
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break;
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case S_IFREG:
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update_special(bus);
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break;
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default:
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printk(KERN_WARNING "usbfs: Unknown node %s "
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"mode %x found on remount!\n",
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bus->d_name.name, bus->d_inode->i_mode);
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break;
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}
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}
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}
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mutex_unlock(&root->d_inode->i_mutex);
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}
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static int remount(struct super_block *sb, int *flags, char *data)
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{
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/* If this is not a real mount,
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* i.e. it's a simple_pin_fs from create_special_files,
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* then ignore it.
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*/
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if (*flags & MS_KERNMOUNT)
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return 0;
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if (parse_options(sb, data)) {
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printk(KERN_WARNING "usbfs: mount parameter error.\n");
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return -EINVAL;
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}
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if (usbfs_mount)
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update_sb(usbfs_mount->mnt_sb);
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return 0;
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}
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static struct inode *usbfs_get_inode (struct super_block *sb, umode_t mode, dev_t dev)
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{
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struct inode *inode = new_inode(sb);
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if (inode) {
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inode->i_ino = get_next_ino();
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inode_init_owner(inode, NULL, mode);
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inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
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switch (mode & S_IFMT) {
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default:
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init_special_inode(inode, mode, dev);
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break;
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case S_IFREG:
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inode->i_fop = &default_file_operations;
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break;
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case S_IFDIR:
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inode->i_op = &simple_dir_inode_operations;
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inode->i_fop = &simple_dir_operations;
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/* directory inodes start off with i_nlink == 2 (for "." entry) */
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inc_nlink(inode);
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break;
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}
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}
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return inode;
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}
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/* SMP-safe */
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static int usbfs_mknod (struct inode *dir, struct dentry *dentry, umode_t mode,
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dev_t dev)
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{
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struct inode *inode = usbfs_get_inode(dir->i_sb, mode, dev);
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int error = -EPERM;
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if (dentry->d_inode)
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return -EEXIST;
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if (inode) {
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d_instantiate(dentry, inode);
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dget(dentry);
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error = 0;
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}
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return error;
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}
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static int usbfs_mkdir (struct inode *dir, struct dentry *dentry, umode_t mode)
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{
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int res;
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mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR;
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res = usbfs_mknod (dir, dentry, mode, 0);
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if (!res)
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inc_nlink(dir);
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return res;
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}
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static int usbfs_create (struct inode *dir, struct dentry *dentry, umode_t mode)
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{
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mode = (mode & S_IALLUGO) | S_IFREG;
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return usbfs_mknod (dir, dentry, mode, 0);
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}
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static inline int usbfs_positive (struct dentry *dentry)
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{
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return dentry->d_inode && !d_unhashed(dentry);
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}
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static int usbfs_empty (struct dentry *dentry)
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{
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struct list_head *list;
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spin_lock(&dentry->d_lock);
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list_for_each(list, &dentry->d_subdirs) {
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struct dentry *de = list_entry(list, struct dentry, d_u.d_child);
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spin_lock_nested(&de->d_lock, DENTRY_D_LOCK_NESTED);
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if (usbfs_positive(de)) {
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spin_unlock(&de->d_lock);
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spin_unlock(&dentry->d_lock);
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return 0;
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}
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spin_unlock(&de->d_lock);
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}
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spin_unlock(&dentry->d_lock);
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return 1;
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}
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static int usbfs_unlink (struct inode *dir, struct dentry *dentry)
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{
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struct inode *inode = dentry->d_inode;
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mutex_lock(&inode->i_mutex);
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drop_nlink(dentry->d_inode);
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dput(dentry);
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mutex_unlock(&inode->i_mutex);
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d_delete(dentry);
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return 0;
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}
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static int usbfs_rmdir(struct inode *dir, struct dentry *dentry)
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{
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int error = -ENOTEMPTY;
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struct inode * inode = dentry->d_inode;
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mutex_lock(&inode->i_mutex);
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dentry_unhash(dentry);
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if (usbfs_empty(dentry)) {
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dont_mount(dentry);
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drop_nlink(dentry->d_inode);
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drop_nlink(dentry->d_inode);
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dput(dentry);
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inode->i_flags |= S_DEAD;
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drop_nlink(dir);
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error = 0;
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}
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mutex_unlock(&inode->i_mutex);
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if (!error)
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d_delete(dentry);
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return error;
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}
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/* default file operations */
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static ssize_t default_read_file (struct file *file, char __user *buf,
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size_t count, loff_t *ppos)
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{
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return 0;
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}
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static ssize_t default_write_file (struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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return count;
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}
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static loff_t default_file_lseek (struct file *file, loff_t offset, int orig)
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{
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loff_t retval = -EINVAL;
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mutex_lock(&file->f_path.dentry->d_inode->i_mutex);
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switch(orig) {
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case 0:
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if (offset > 0) {
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file->f_pos = offset;
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retval = file->f_pos;
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}
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break;
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case 1:
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if ((offset + file->f_pos) > 0) {
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file->f_pos += offset;
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retval = file->f_pos;
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}
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break;
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default:
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break;
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}
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mutex_unlock(&file->f_path.dentry->d_inode->i_mutex);
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return retval;
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}
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static const struct file_operations default_file_operations = {
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.read = default_read_file,
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.write = default_write_file,
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.open = simple_open,
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.llseek = default_file_lseek,
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};
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static const struct super_operations usbfs_ops = {
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.statfs = simple_statfs,
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.drop_inode = generic_delete_inode,
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.remount_fs = remount,
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.show_options = usbfs_show_options,
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};
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static int usbfs_fill_super(struct super_block *sb, void *data, int silent)
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{
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struct inode *inode;
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sb->s_blocksize = PAGE_CACHE_SIZE;
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sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
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sb->s_magic = USBDEVICE_SUPER_MAGIC;
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sb->s_op = &usbfs_ops;
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sb->s_time_gran = 1;
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inode = usbfs_get_inode(sb, S_IFDIR | 0755, 0);
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sb->s_root = d_make_root(inode);
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if (!sb->s_root) {
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dbg("%s: could not get root dentry!",__func__);
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return -ENOMEM;
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}
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return 0;
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}
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/*
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* fs_create_by_name - create a file, given a name
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* @name: name of file
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* @mode: type of file
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* @parent: dentry of directory to create it in
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* @dentry: resulting dentry of file
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*
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* This function handles both regular files and directories.
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*/
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static int fs_create_by_name (const char *name, umode_t mode,
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struct dentry *parent, struct dentry **dentry)
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{
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int error = 0;
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/* If the parent is not specified, we create it in the root.
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* We need the root dentry to do this, which is in the super
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* block. A pointer to that is in the struct vfsmount that we
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* have around.
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*/
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if (!parent ) {
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if (usbfs_mount)
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parent = usbfs_mount->mnt_root;
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}
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if (!parent) {
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dbg("Ah! can not find a parent!");
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return -EFAULT;
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}
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*dentry = NULL;
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mutex_lock(&parent->d_inode->i_mutex);
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*dentry = lookup_one_len(name, parent, strlen(name));
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if (!IS_ERR(*dentry)) {
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if (S_ISDIR(mode))
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error = usbfs_mkdir (parent->d_inode, *dentry, mode);
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else
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error = usbfs_create (parent->d_inode, *dentry, mode);
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} else
|
|
error = PTR_ERR(*dentry);
|
|
mutex_unlock(&parent->d_inode->i_mutex);
|
|
|
|
return error;
|
|
}
|
|
|
|
static struct dentry *fs_create_file (const char *name, umode_t mode,
|
|
struct dentry *parent, void *data,
|
|
const struct file_operations *fops,
|
|
uid_t uid, gid_t gid)
|
|
{
|
|
struct dentry *dentry;
|
|
int error;
|
|
|
|
dbg("creating file '%s'",name);
|
|
|
|
error = fs_create_by_name (name, mode, parent, &dentry);
|
|
if (error) {
|
|
dentry = NULL;
|
|
} else {
|
|
if (dentry->d_inode) {
|
|
if (data)
|
|
dentry->d_inode->i_private = data;
|
|
if (fops)
|
|
dentry->d_inode->i_fop = fops;
|
|
dentry->d_inode->i_uid = uid;
|
|
dentry->d_inode->i_gid = gid;
|
|
}
|
|
}
|
|
|
|
return dentry;
|
|
}
|
|
|
|
static void fs_remove_file (struct dentry *dentry)
|
|
{
|
|
struct dentry *parent = dentry->d_parent;
|
|
|
|
if (!parent || !parent->d_inode)
|
|
return;
|
|
|
|
mutex_lock_nested(&parent->d_inode->i_mutex, I_MUTEX_PARENT);
|
|
if (usbfs_positive(dentry)) {
|
|
if (dentry->d_inode) {
|
|
if (S_ISDIR(dentry->d_inode->i_mode))
|
|
usbfs_rmdir(parent->d_inode, dentry);
|
|
else
|
|
usbfs_unlink(parent->d_inode, dentry);
|
|
dput(dentry);
|
|
}
|
|
}
|
|
mutex_unlock(&parent->d_inode->i_mutex);
|
|
}
|
|
|
|
/* --------------------------------------------------------------------- */
|
|
|
|
static struct dentry *usb_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return mount_single(fs_type, flags, data, usbfs_fill_super);
|
|
}
|
|
|
|
static struct file_system_type usb_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "usbfs",
|
|
.mount = usb_mount,
|
|
.kill_sb = kill_litter_super,
|
|
};
|
|
|
|
/* --------------------------------------------------------------------- */
|
|
|
|
static int create_special_files (void)
|
|
{
|
|
struct dentry *parent;
|
|
int retval;
|
|
|
|
/* create the devices special file */
|
|
retval = simple_pin_fs(&usb_fs_type, &usbfs_mount, &usbfs_mount_count);
|
|
if (retval) {
|
|
printk(KERN_ERR "Unable to get usbfs mount\n");
|
|
goto exit;
|
|
}
|
|
|
|
parent = usbfs_mount->mnt_root;
|
|
devices_usbfs_dentry = fs_create_file ("devices",
|
|
listmode | S_IFREG, parent,
|
|
NULL, &usbfs_devices_fops,
|
|
listuid, listgid);
|
|
if (devices_usbfs_dentry == NULL) {
|
|
printk(KERN_ERR "Unable to create devices usbfs file\n");
|
|
retval = -ENODEV;
|
|
goto error_clean_mounts;
|
|
}
|
|
|
|
goto exit;
|
|
|
|
error_clean_mounts:
|
|
simple_release_fs(&usbfs_mount, &usbfs_mount_count);
|
|
exit:
|
|
return retval;
|
|
}
|
|
|
|
static void remove_special_files (void)
|
|
{
|
|
if (devices_usbfs_dentry)
|
|
fs_remove_file (devices_usbfs_dentry);
|
|
devices_usbfs_dentry = NULL;
|
|
simple_release_fs(&usbfs_mount, &usbfs_mount_count);
|
|
}
|
|
|
|
void usbfs_update_special (void)
|
|
{
|
|
struct inode *inode;
|
|
|
|
if (devices_usbfs_dentry) {
|
|
inode = devices_usbfs_dentry->d_inode;
|
|
if (inode)
|
|
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
|
|
}
|
|
}
|
|
|
|
static void usbfs_add_bus(struct usb_bus *bus)
|
|
{
|
|
struct dentry *parent;
|
|
char name[8];
|
|
int retval;
|
|
|
|
/* create the special files if this is the first bus added */
|
|
if (num_buses == 0) {
|
|
retval = create_special_files();
|
|
if (retval)
|
|
return;
|
|
}
|
|
++num_buses;
|
|
|
|
sprintf (name, "%03d", bus->busnum);
|
|
|
|
parent = usbfs_mount->mnt_root;
|
|
bus->usbfs_dentry = fs_create_file (name, busmode | S_IFDIR, parent,
|
|
bus, NULL, busuid, busgid);
|
|
if (bus->usbfs_dentry == NULL) {
|
|
printk(KERN_ERR "Error creating usbfs bus entry\n");
|
|
return;
|
|
}
|
|
}
|
|
|
|
static void usbfs_remove_bus(struct usb_bus *bus)
|
|
{
|
|
if (bus->usbfs_dentry) {
|
|
fs_remove_file (bus->usbfs_dentry);
|
|
bus->usbfs_dentry = NULL;
|
|
}
|
|
|
|
--num_buses;
|
|
if (num_buses <= 0) {
|
|
remove_special_files();
|
|
num_buses = 0;
|
|
}
|
|
}
|
|
|
|
static void usbfs_add_device(struct usb_device *dev)
|
|
{
|
|
char name[8];
|
|
int i;
|
|
int i_size;
|
|
|
|
sprintf (name, "%03d", dev->devnum);
|
|
dev->usbfs_dentry = fs_create_file (name, devmode | S_IFREG,
|
|
dev->bus->usbfs_dentry, dev,
|
|
&usbdev_file_operations,
|
|
devuid, devgid);
|
|
if (dev->usbfs_dentry == NULL) {
|
|
printk(KERN_ERR "Error creating usbfs device entry\n");
|
|
return;
|
|
}
|
|
|
|
/* Set the size of the device's file to be
|
|
* equal to the size of the device descriptors. */
|
|
i_size = sizeof (struct usb_device_descriptor);
|
|
for (i = 0; i < dev->descriptor.bNumConfigurations; ++i) {
|
|
struct usb_config_descriptor *config =
|
|
(struct usb_config_descriptor *)dev->rawdescriptors[i];
|
|
i_size += le16_to_cpu(config->wTotalLength);
|
|
}
|
|
if (dev->usbfs_dentry->d_inode)
|
|
dev->usbfs_dentry->d_inode->i_size = i_size;
|
|
}
|
|
|
|
static void usbfs_remove_device(struct usb_device *dev)
|
|
{
|
|
if (dev->usbfs_dentry) {
|
|
fs_remove_file (dev->usbfs_dentry);
|
|
dev->usbfs_dentry = NULL;
|
|
}
|
|
}
|
|
|
|
static int usbfs_notify(struct notifier_block *self, unsigned long action, void *dev)
|
|
{
|
|
switch (action) {
|
|
case USB_DEVICE_ADD:
|
|
usbfs_add_device(dev);
|
|
break;
|
|
case USB_DEVICE_REMOVE:
|
|
usbfs_remove_device(dev);
|
|
break;
|
|
case USB_BUS_ADD:
|
|
usbfs_add_bus(dev);
|
|
break;
|
|
case USB_BUS_REMOVE:
|
|
usbfs_remove_bus(dev);
|
|
}
|
|
|
|
usbfs_update_special();
|
|
usbfs_conn_disc_event();
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block usbfs_nb = {
|
|
.notifier_call = usbfs_notify,
|
|
};
|
|
|
|
/* --------------------------------------------------------------------- */
|
|
|
|
static struct proc_dir_entry *usbdir = NULL;
|
|
|
|
int __init usbfs_init(void)
|
|
{
|
|
int retval;
|
|
|
|
retval = register_filesystem(&usb_fs_type);
|
|
if (retval)
|
|
return retval;
|
|
|
|
usb_register_notify(&usbfs_nb);
|
|
|
|
/* create mount point for usbfs */
|
|
usbdir = proc_mkdir("bus/usb", NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void usbfs_cleanup(void)
|
|
{
|
|
usb_unregister_notify(&usbfs_nb);
|
|
unregister_filesystem(&usb_fs_type);
|
|
if (usbdir)
|
|
remove_proc_entry("bus/usb", NULL);
|
|
}
|
|
|