2005-04-16 18:20:36 -04:00
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/*
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2007-09-20 04:31:38 -04:00
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* fs/sysfs/dir.c - sysfs core and dir operation implementation
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*
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* Copyright (c) 2001-3 Patrick Mochel
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* Copyright (c) 2007 SUSE Linux Products GmbH
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* Copyright (c) 2007 Tejun Heo <teheo@suse.de>
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*
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* This file is released under the GPLv2.
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*
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* Please see Documentation/filesystems/sysfs.txt for more information.
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2005-04-16 18:20:36 -04:00
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*/
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#undef DEBUG
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include <linux/module.h>
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#include <linux/kobject.h>
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2005-06-23 03:09:12 -04:00
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#include <linux/namei.h>
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2007-06-13 14:45:13 -04:00
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#include <linux/idr.h>
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2007-06-13 14:45:18 -04:00
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#include <linux/completion.h>
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2007-07-26 10:53:53 -04:00
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#include <linux/mutex.h>
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2008-03-13 22:41:52 -04:00
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#include <linux/slab.h>
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2009-11-04 05:50:06 -05:00
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#include <linux/security.h>
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2005-04-16 18:20:36 -04:00
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#include "sysfs.h"
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2007-06-13 15:27:23 -04:00
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DEFINE_MUTEX(sysfs_mutex);
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2007-10-17 02:30:25 -04:00
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DEFINE_SPINLOCK(sysfs_assoc_lock);
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2005-04-16 18:20:36 -04:00
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2007-10-17 02:30:25 -04:00
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static DEFINE_SPINLOCK(sysfs_ino_lock);
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2007-06-13 14:45:13 -04:00
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static DEFINE_IDA(sysfs_ino_ida);
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2007-06-13 14:45:18 -04:00
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/**
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* sysfs_link_sibling - link sysfs_dirent into sibling list
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* @sd: sysfs_dirent of interest
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*
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* Link @sd into its sibling list which starts from
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2007-09-20 03:05:12 -04:00
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* sd->s_parent->s_dir.children.
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2007-06-13 14:45:18 -04:00
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*
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* Locking:
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2007-06-13 15:27:23 -04:00
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* mutex_lock(sysfs_mutex)
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2007-06-13 14:45:18 -04:00
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*/
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2007-08-02 08:38:03 -04:00
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static void sysfs_link_sibling(struct sysfs_dirent *sd)
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2007-06-13 14:45:18 -04:00
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{
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struct sysfs_dirent *parent_sd = sd->s_parent;
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2007-08-20 08:36:30 -04:00
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struct sysfs_dirent **pos;
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2007-06-13 14:45:18 -04:00
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BUG_ON(sd->s_sibling);
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2007-08-20 08:36:30 -04:00
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/* Store directory entries in order by ino. This allows
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* readdir to properly restart without having to add a
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2007-09-20 03:05:12 -04:00
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* cursor into the s_dir.children list.
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2007-08-20 08:36:30 -04:00
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*/
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2007-09-20 03:05:12 -04:00
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for (pos = &parent_sd->s_dir.children; *pos; pos = &(*pos)->s_sibling) {
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2007-08-20 08:36:30 -04:00
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if (sd->s_ino < (*pos)->s_ino)
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break;
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}
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sd->s_sibling = *pos;
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*pos = sd;
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2007-06-13 14:45:18 -04:00
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}
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/**
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* sysfs_unlink_sibling - unlink sysfs_dirent from sibling list
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* @sd: sysfs_dirent of interest
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*
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* Unlink @sd from its sibling list which starts from
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2007-09-20 03:05:12 -04:00
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* sd->s_parent->s_dir.children.
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2007-06-13 14:45:18 -04:00
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*
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* Locking:
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2007-06-13 15:27:23 -04:00
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* mutex_lock(sysfs_mutex)
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2007-06-13 14:45:18 -04:00
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*/
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2007-08-02 08:38:03 -04:00
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static void sysfs_unlink_sibling(struct sysfs_dirent *sd)
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2007-06-13 14:45:18 -04:00
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{
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struct sysfs_dirent **pos;
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2007-09-20 03:05:12 -04:00
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for (pos = &sd->s_parent->s_dir.children; *pos;
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pos = &(*pos)->s_sibling) {
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2007-06-13 14:45:18 -04:00
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if (*pos == sd) {
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*pos = sd->s_sibling;
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sd->s_sibling = NULL;
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break;
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}
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}
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}
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2007-06-13 14:45:18 -04:00
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/**
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* sysfs_get_active - get an active reference to sysfs_dirent
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* @sd: sysfs_dirent to get an active reference to
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*
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* Get an active reference of @sd. This function is noop if @sd
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* is NULL.
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*
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* RETURNS:
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* Pointer to @sd on success, NULL on failure.
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*/
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2007-10-24 12:23:32 -04:00
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static struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd)
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2007-06-13 14:45:18 -04:00
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{
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2007-06-13 14:45:18 -04:00
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if (unlikely(!sd))
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return NULL;
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while (1) {
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int v, t;
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v = atomic_read(&sd->s_active);
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if (unlikely(v < 0))
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return NULL;
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t = atomic_cmpxchg(&sd->s_active, v, v + 1);
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2010-01-02 16:37:12 -05:00
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if (likely(t == v)) {
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rwsem_acquire_read(&sd->dep_map, 0, 1, _RET_IP_);
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2007-06-13 14:45:18 -04:00
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return sd;
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2010-01-02 16:37:12 -05:00
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}
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2007-06-13 14:45:18 -04:00
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if (t < 0)
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return NULL;
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cpu_relax();
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2007-06-13 14:45:18 -04:00
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}
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}
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/**
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* sysfs_put_active - put an active reference to sysfs_dirent
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* @sd: sysfs_dirent to put an active reference to
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*
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* Put an active reference to @sd. This function is noop if @sd
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* is NULL.
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*/
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2007-10-24 12:23:32 -04:00
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static void sysfs_put_active(struct sysfs_dirent *sd)
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2007-06-13 14:45:18 -04:00
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{
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2007-06-13 14:45:18 -04:00
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struct completion *cmpl;
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int v;
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if (unlikely(!sd))
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return;
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2010-01-02 16:37:12 -05:00
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rwsem_release(&sd->dep_map, 1, _RET_IP_);
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2007-06-13 14:45:18 -04:00
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v = atomic_dec_return(&sd->s_active);
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if (likely(v != SD_DEACTIVATED_BIAS))
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return;
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/* atomic_dec_return() is a mb(), we'll always see the updated
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2007-06-13 14:45:18 -04:00
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* sd->s_sibling.
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2007-06-13 14:45:18 -04:00
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*/
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2007-06-13 14:45:18 -04:00
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cmpl = (void *)sd->s_sibling;
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2007-06-13 14:45:18 -04:00
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complete(cmpl);
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2007-06-13 14:45:18 -04:00
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}
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/**
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* sysfs_get_active_two - get active references to sysfs_dirent and parent
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* @sd: sysfs_dirent of interest
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*
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* Get active reference to @sd and its parent. Parent's active
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* reference is grabbed first. This function is noop if @sd is
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* NULL.
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*
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* RETURNS:
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* Pointer to @sd on success, NULL on failure.
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*/
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struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd)
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{
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if (sd) {
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if (sd->s_parent && unlikely(!sysfs_get_active(sd->s_parent)))
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return NULL;
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if (unlikely(!sysfs_get_active(sd))) {
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sysfs_put_active(sd->s_parent);
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return NULL;
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}
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}
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return sd;
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}
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/**
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* sysfs_put_active_two - put active references to sysfs_dirent and parent
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* @sd: sysfs_dirent of interest
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*
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* Put active references to @sd and its parent. This function is
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* noop if @sd is NULL.
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*/
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void sysfs_put_active_two(struct sysfs_dirent *sd)
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{
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if (sd) {
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sysfs_put_active(sd);
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sysfs_put_active(sd->s_parent);
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}
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}
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/**
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* sysfs_deactivate - deactivate sysfs_dirent
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* @sd: sysfs_dirent to deactivate
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*
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2007-06-13 14:45:18 -04:00
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* Deny new active references and drain existing ones.
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2007-06-13 14:45:18 -04:00
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*/
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2007-06-13 15:27:24 -04:00
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static void sysfs_deactivate(struct sysfs_dirent *sd)
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2007-06-13 14:45:18 -04:00
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{
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2007-06-13 14:45:18 -04:00
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DECLARE_COMPLETION_ONSTACK(wait);
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int v;
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2007-06-13 14:45:18 -04:00
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2007-06-13 15:27:22 -04:00
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BUG_ON(sd->s_sibling || !(sd->s_flags & SYSFS_FLAG_REMOVED));
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2007-06-13 14:45:18 -04:00
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sd->s_sibling = (void *)&wait;
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2007-06-13 14:45:18 -04:00
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2010-01-02 16:37:12 -05:00
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rwsem_acquire(&sd->dep_map, 0, 0, _RET_IP_);
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2007-06-13 14:45:18 -04:00
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/* atomic_add_return() is a mb(), put_active() will always see
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2007-06-13 14:45:18 -04:00
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* the updated sd->s_sibling.
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2007-06-13 14:45:18 -04:00
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*/
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2007-06-13 14:45:18 -04:00
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v = atomic_add_return(SD_DEACTIVATED_BIAS, &sd->s_active);
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2010-01-02 16:37:12 -05:00
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if (v != SD_DEACTIVATED_BIAS) {
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lock_contended(&sd->dep_map, _RET_IP_);
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2007-06-13 14:45:18 -04:00
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wait_for_completion(&wait);
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2010-01-02 16:37:12 -05:00
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}
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2007-06-13 14:45:18 -04:00
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2007-06-13 14:45:18 -04:00
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sd->s_sibling = NULL;
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2010-01-02 16:37:12 -05:00
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lock_acquired(&sd->dep_map, _RET_IP_);
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rwsem_release(&sd->dep_map, 1, _RET_IP_);
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2007-06-13 14:45:18 -04:00
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}
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2007-06-13 14:45:17 -04:00
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static int sysfs_alloc_ino(ino_t *pino)
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2007-06-13 14:45:13 -04:00
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{
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int ino, rc;
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retry:
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spin_lock(&sysfs_ino_lock);
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rc = ida_get_new_above(&sysfs_ino_ida, 2, &ino);
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spin_unlock(&sysfs_ino_lock);
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if (rc == -EAGAIN) {
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if (ida_pre_get(&sysfs_ino_ida, GFP_KERNEL))
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goto retry;
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rc = -ENOMEM;
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|
}
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*pino = ino;
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return rc;
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|
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}
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static void sysfs_free_ino(ino_t ino)
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{
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spin_lock(&sysfs_ino_lock);
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ida_remove(&sysfs_ino_ida, ino);
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spin_unlock(&sysfs_ino_lock);
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|
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}
|
|
|
|
|
2007-06-13 14:45:13 -04:00
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|
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void release_sysfs_dirent(struct sysfs_dirent * sd)
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|
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{
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2007-06-13 14:45:14 -04:00
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struct sysfs_dirent *parent_sd;
|
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|
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|
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|
repeat:
|
2007-06-13 15:27:23 -04:00
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|
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/* Moving/renaming is always done while holding reference.
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|
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* sd->s_parent won't change beneath us.
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|
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|
*/
|
2007-06-13 14:45:14 -04:00
|
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|
parent_sd = sd->s_parent;
|
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|
|
|
2007-06-13 15:27:21 -04:00
|
|
|
if (sysfs_type(sd) == SYSFS_KOBJ_LINK)
|
2007-09-20 03:05:11 -04:00
|
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|
sysfs_put(sd->s_symlink.target_sd);
|
2007-06-13 15:27:21 -04:00
|
|
|
if (sysfs_type(sd) & SYSFS_COPY_NAME)
|
2007-06-13 14:45:15 -04:00
|
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|
kfree(sd->s_name);
|
2009-11-04 05:50:06 -05:00
|
|
|
if (sd->s_iattr && sd->s_iattr->ia_secdata)
|
|
|
|
security_release_secctx(sd->s_iattr->ia_secdata,
|
|
|
|
sd->s_iattr->ia_secdata_len);
|
2007-06-13 14:45:13 -04:00
|
|
|
kfree(sd->s_iattr);
|
2007-06-13 14:45:13 -04:00
|
|
|
sysfs_free_ino(sd->s_ino);
|
2007-06-13 14:45:13 -04:00
|
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|
kmem_cache_free(sysfs_dir_cachep, sd);
|
2007-06-13 14:45:14 -04:00
|
|
|
|
|
|
|
sd = parent_sd;
|
|
|
|
if (sd && atomic_dec_and_test(&sd->s_count))
|
|
|
|
goto repeat;
|
2007-06-13 14:45:13 -04:00
|
|
|
}
|
|
|
|
|
2009-11-08 02:27:01 -05:00
|
|
|
static int sysfs_dentry_delete(struct dentry *dentry)
|
|
|
|
{
|
|
|
|
struct sysfs_dirent *sd = dentry->d_fsdata;
|
|
|
|
return !!(sd->s_flags & SYSFS_FLAG_REMOVED);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int sysfs_dentry_revalidate(struct dentry *dentry, struct nameidata *nd)
|
|
|
|
{
|
|
|
|
struct sysfs_dirent *sd = dentry->d_fsdata;
|
|
|
|
int is_dir;
|
|
|
|
|
|
|
|
mutex_lock(&sysfs_mutex);
|
|
|
|
|
|
|
|
/* The sysfs dirent has been deleted */
|
|
|
|
if (sd->s_flags & SYSFS_FLAG_REMOVED)
|
|
|
|
goto out_bad;
|
|
|
|
|
2009-11-20 19:08:56 -05:00
|
|
|
/* The sysfs dirent has been moved? */
|
|
|
|
if (dentry->d_parent->d_fsdata != sd->s_parent)
|
|
|
|
goto out_bad;
|
|
|
|
|
|
|
|
/* The sysfs dirent has been renamed */
|
|
|
|
if (strcmp(dentry->d_name.name, sd->s_name) != 0)
|
|
|
|
goto out_bad;
|
|
|
|
|
2009-11-08 02:27:01 -05:00
|
|
|
mutex_unlock(&sysfs_mutex);
|
|
|
|
out_valid:
|
|
|
|
return 1;
|
|
|
|
out_bad:
|
|
|
|
/* Remove the dentry from the dcache hashes.
|
|
|
|
* If this is a deleted dentry we use d_drop instead of d_delete
|
|
|
|
* so sysfs doesn't need to cope with negative dentries.
|
2009-11-20 19:08:56 -05:00
|
|
|
*
|
|
|
|
* If this is a dentry that has simply been renamed we
|
|
|
|
* use d_drop to remove it from the dcache lookup on its
|
|
|
|
* old parent. If this dentry persists later when a lookup
|
|
|
|
* is performed at its new name the dentry will be readded
|
|
|
|
* to the dcache hashes.
|
2009-11-08 02:27:01 -05:00
|
|
|
*/
|
|
|
|
is_dir = (sysfs_type(sd) == SYSFS_DIR);
|
|
|
|
mutex_unlock(&sysfs_mutex);
|
|
|
|
if (is_dir) {
|
|
|
|
/* If we have submounts we must allow the vfs caches
|
|
|
|
* to lie about the state of the filesystem to prevent
|
|
|
|
* leaks and other nasty things.
|
|
|
|
*/
|
|
|
|
if (have_submounts(dentry))
|
|
|
|
goto out_valid;
|
|
|
|
shrink_dcache_parent(dentry);
|
|
|
|
}
|
|
|
|
d_drop(dentry);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2009-11-08 02:27:00 -05:00
|
|
|
static void sysfs_dentry_iput(struct dentry *dentry, struct inode *inode)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
|
|
|
struct sysfs_dirent * sd = dentry->d_fsdata;
|
|
|
|
|
2007-08-20 08:36:30 -04:00
|
|
|
sysfs_put(sd);
|
2005-04-16 18:20:36 -04:00
|
|
|
iput(inode);
|
|
|
|
}
|
|
|
|
|
2009-02-20 01:01:46 -05:00
|
|
|
static const struct dentry_operations sysfs_dentry_ops = {
|
2009-11-08 02:27:01 -05:00
|
|
|
.d_revalidate = sysfs_dentry_revalidate,
|
|
|
|
.d_delete = sysfs_dentry_delete,
|
2009-11-08 02:27:00 -05:00
|
|
|
.d_iput = sysfs_dentry_iput,
|
2005-04-16 18:20:36 -04:00
|
|
|
};
|
|
|
|
|
2007-06-13 14:45:15 -04:00
|
|
|
struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
2007-06-13 14:45:15 -04:00
|
|
|
char *dup_name = NULL;
|
2007-07-13 22:03:35 -04:00
|
|
|
struct sysfs_dirent *sd;
|
2007-06-13 14:45:15 -04:00
|
|
|
|
|
|
|
if (type & SYSFS_COPY_NAME) {
|
|
|
|
name = dup_name = kstrdup(name, GFP_KERNEL);
|
|
|
|
if (!name)
|
2007-07-13 22:03:35 -04:00
|
|
|
return NULL;
|
2007-06-13 14:45:15 -04:00
|
|
|
}
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2007-02-10 04:45:03 -05:00
|
|
|
sd = kmem_cache_zalloc(sysfs_dir_cachep, GFP_KERNEL);
|
2005-04-16 18:20:36 -04:00
|
|
|
if (!sd)
|
2007-07-13 22:03:35 -04:00
|
|
|
goto err_out1;
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2007-06-13 14:45:15 -04:00
|
|
|
if (sysfs_alloc_ino(&sd->s_ino))
|
2007-07-13 22:03:35 -04:00
|
|
|
goto err_out2;
|
2007-06-13 14:45:13 -04:00
|
|
|
|
2005-04-16 18:20:36 -04:00
|
|
|
atomic_set(&sd->s_count, 1);
|
2007-06-13 14:45:18 -04:00
|
|
|
atomic_set(&sd->s_active, 0);
|
2010-01-02 16:37:12 -05:00
|
|
|
sysfs_dirent_init_lockdep(sd);
|
2007-06-13 14:45:14 -04:00
|
|
|
|
2007-06-13 14:45:15 -04:00
|
|
|
sd->s_name = name;
|
2007-06-13 14:45:14 -04:00
|
|
|
sd->s_mode = mode;
|
2007-06-13 15:27:21 -04:00
|
|
|
sd->s_flags = type;
|
2005-04-16 18:20:36 -04:00
|
|
|
|
|
|
|
return sd;
|
2007-06-13 14:45:15 -04:00
|
|
|
|
2007-07-13 22:03:35 -04:00
|
|
|
err_out2:
|
2007-06-13 14:45:15 -04:00
|
|
|
kmem_cache_free(sysfs_dir_cachep, sd);
|
2007-07-13 22:03:35 -04:00
|
|
|
err_out1:
|
|
|
|
kfree(dup_name);
|
2007-06-13 14:45:15 -04:00
|
|
|
return NULL;
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
2007-06-13 15:27:23 -04:00
|
|
|
/**
|
2007-06-13 15:27:24 -04:00
|
|
|
* sysfs_addrm_start - prepare for sysfs_dirent add/remove
|
|
|
|
* @acxt: pointer to sysfs_addrm_cxt to be used
|
|
|
|
* @parent_sd: parent sysfs_dirent
|
2007-06-13 15:27:23 -04:00
|
|
|
*
|
2007-06-13 15:27:24 -04:00
|
|
|
* This function is called when the caller is about to add or
|
|
|
|
* remove sysfs_dirent under @parent_sd. This function acquires
|
2009-11-20 19:08:55 -05:00
|
|
|
* sysfs_mutex. @acxt is used to keep and pass context to
|
2007-06-13 15:27:24 -04:00
|
|
|
* other addrm functions.
|
2007-06-13 15:27:23 -04:00
|
|
|
*
|
|
|
|
* LOCKING:
|
2007-06-13 15:27:24 -04:00
|
|
|
* Kernel thread context (may sleep). sysfs_mutex is locked on
|
2009-11-20 19:08:55 -05:00
|
|
|
* return.
|
2007-06-13 15:27:23 -04:00
|
|
|
*/
|
2007-06-13 15:27:24 -04:00
|
|
|
void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt,
|
|
|
|
struct sysfs_dirent *parent_sd)
|
2007-01-24 14:35:52 -05:00
|
|
|
{
|
2007-06-13 15:27:24 -04:00
|
|
|
memset(acxt, 0, sizeof(*acxt));
|
|
|
|
acxt->parent_sd = parent_sd;
|
|
|
|
|
|
|
|
mutex_lock(&sysfs_mutex);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2008-06-10 05:09:08 -04:00
|
|
|
* __sysfs_add_one - add sysfs_dirent to parent without warning
|
2007-06-13 15:27:24 -04:00
|
|
|
* @acxt: addrm context to use
|
|
|
|
* @sd: sysfs_dirent to be added
|
|
|
|
*
|
|
|
|
* Get @acxt->parent_sd and set sd->s_parent to it and increment
|
2007-09-20 03:05:09 -04:00
|
|
|
* nlink of parent inode if @sd is a directory and link into the
|
|
|
|
* children list of the parent.
|
2007-06-13 15:27:24 -04:00
|
|
|
*
|
|
|
|
* This function should be called between calls to
|
|
|
|
* sysfs_addrm_start() and sysfs_addrm_finish() and should be
|
|
|
|
* passed the same @acxt as passed to sysfs_addrm_start().
|
|
|
|
*
|
|
|
|
* LOCKING:
|
|
|
|
* Determined by sysfs_addrm_start().
|
2007-08-02 08:38:03 -04:00
|
|
|
*
|
|
|
|
* RETURNS:
|
|
|
|
* 0 on success, -EEXIST if entry with the given name already
|
|
|
|
* exists.
|
2007-06-13 15:27:24 -04:00
|
|
|
*/
|
2008-06-10 05:09:08 -04:00
|
|
|
int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
|
2007-06-13 15:27:24 -04:00
|
|
|
{
|
2009-11-20 19:08:51 -05:00
|
|
|
struct sysfs_inode_attrs *ps_iattr;
|
|
|
|
|
2008-05-15 01:34:16 -04:00
|
|
|
if (sysfs_find_dirent(acxt->parent_sd, sd->s_name))
|
2007-08-02 08:38:03 -04:00
|
|
|
return -EEXIST;
|
|
|
|
|
2007-06-13 15:27:24 -04:00
|
|
|
sd->s_parent = sysfs_get(acxt->parent_sd);
|
|
|
|
|
2007-08-02 08:38:03 -04:00
|
|
|
sysfs_link_sibling(sd);
|
2007-08-02 08:38:03 -04:00
|
|
|
|
2009-11-20 19:08:51 -05:00
|
|
|
/* Update timestamps on the parent */
|
|
|
|
ps_iattr = acxt->parent_sd->s_iattr;
|
|
|
|
if (ps_iattr) {
|
|
|
|
struct iattr *ps_iattrs = &ps_iattr->ia_iattr;
|
|
|
|
ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME;
|
|
|
|
}
|
|
|
|
|
2007-08-02 08:38:03 -04:00
|
|
|
return 0;
|
2007-06-13 15:27:24 -04:00
|
|
|
}
|
|
|
|
|
2009-02-12 12:56:59 -05:00
|
|
|
/**
|
|
|
|
* sysfs_pathname - return full path to sysfs dirent
|
|
|
|
* @sd: sysfs_dirent whose path we want
|
|
|
|
* @path: caller allocated buffer
|
|
|
|
*
|
|
|
|
* Gives the name "/" to the sysfs_root entry; any path returned
|
|
|
|
* is relative to wherever sysfs is mounted.
|
|
|
|
*
|
|
|
|
* XXX: does no error checking on @path size
|
|
|
|
*/
|
|
|
|
static char *sysfs_pathname(struct sysfs_dirent *sd, char *path)
|
|
|
|
{
|
|
|
|
if (sd->s_parent) {
|
|
|
|
sysfs_pathname(sd->s_parent, path);
|
|
|
|
strcat(path, "/");
|
|
|
|
}
|
|
|
|
strcat(path, sd->s_name);
|
|
|
|
return path;
|
|
|
|
}
|
|
|
|
|
2008-06-10 05:09:08 -04:00
|
|
|
/**
|
|
|
|
* sysfs_add_one - add sysfs_dirent to parent
|
|
|
|
* @acxt: addrm context to use
|
|
|
|
* @sd: sysfs_dirent to be added
|
|
|
|
*
|
|
|
|
* Get @acxt->parent_sd and set sd->s_parent to it and increment
|
|
|
|
* nlink of parent inode if @sd is a directory and link into the
|
|
|
|
* children list of the parent.
|
|
|
|
*
|
|
|
|
* This function should be called between calls to
|
|
|
|
* sysfs_addrm_start() and sysfs_addrm_finish() and should be
|
|
|
|
* passed the same @acxt as passed to sysfs_addrm_start().
|
|
|
|
*
|
|
|
|
* LOCKING:
|
|
|
|
* Determined by sysfs_addrm_start().
|
|
|
|
*
|
|
|
|
* RETURNS:
|
|
|
|
* 0 on success, -EEXIST if entry with the given name already
|
|
|
|
* exists.
|
|
|
|
*/
|
|
|
|
int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
ret = __sysfs_add_one(acxt, sd);
|
2009-02-12 12:56:59 -05:00
|
|
|
if (ret == -EEXIST) {
|
|
|
|
char *path = kzalloc(PATH_MAX, GFP_KERNEL);
|
|
|
|
WARN(1, KERN_WARNING
|
|
|
|
"sysfs: cannot create duplicate filename '%s'\n",
|
|
|
|
(path == NULL) ? sd->s_name :
|
|
|
|
strcat(strcat(sysfs_pathname(acxt->parent_sd, path), "/"),
|
|
|
|
sd->s_name));
|
|
|
|
kfree(path);
|
|
|
|
}
|
|
|
|
|
2008-06-10 05:09:08 -04:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2007-06-13 15:27:24 -04:00
|
|
|
/**
|
|
|
|
* sysfs_remove_one - remove sysfs_dirent from parent
|
|
|
|
* @acxt: addrm context to use
|
2008-01-08 12:11:24 -05:00
|
|
|
* @sd: sysfs_dirent to be removed
|
2007-06-13 15:27:24 -04:00
|
|
|
*
|
|
|
|
* Mark @sd removed and drop nlink of parent inode if @sd is a
|
2007-09-20 03:05:09 -04:00
|
|
|
* directory. @sd is unlinked from the children list.
|
2007-06-13 15:27:24 -04:00
|
|
|
*
|
|
|
|
* This function should be called between calls to
|
|
|
|
* sysfs_addrm_start() and sysfs_addrm_finish() and should be
|
|
|
|
* passed the same @acxt as passed to sysfs_addrm_start().
|
|
|
|
*
|
|
|
|
* LOCKING:
|
|
|
|
* Determined by sysfs_addrm_start().
|
|
|
|
*/
|
|
|
|
void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
|
|
|
|
{
|
2009-11-20 19:08:51 -05:00
|
|
|
struct sysfs_inode_attrs *ps_iattr;
|
|
|
|
|
2007-08-02 08:38:03 -04:00
|
|
|
BUG_ON(sd->s_flags & SYSFS_FLAG_REMOVED);
|
|
|
|
|
|
|
|
sysfs_unlink_sibling(sd);
|
2007-06-13 15:27:24 -04:00
|
|
|
|
2009-11-20 19:08:51 -05:00
|
|
|
/* Update timestamps on the parent */
|
|
|
|
ps_iattr = acxt->parent_sd->s_iattr;
|
|
|
|
if (ps_iattr) {
|
|
|
|
struct iattr *ps_iattrs = &ps_iattr->ia_iattr;
|
|
|
|
ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME;
|
|
|
|
}
|
|
|
|
|
2007-06-13 15:27:24 -04:00
|
|
|
sd->s_flags |= SYSFS_FLAG_REMOVED;
|
|
|
|
sd->s_sibling = acxt->removed;
|
|
|
|
acxt->removed = sd;
|
2007-06-13 15:27:24 -04:00
|
|
|
}
|
|
|
|
|
2007-06-13 15:27:24 -04:00
|
|
|
/**
|
|
|
|
* sysfs_addrm_finish - finish up sysfs_dirent add/remove
|
|
|
|
* @acxt: addrm context to finish up
|
|
|
|
*
|
|
|
|
* Finish up sysfs_dirent add/remove. Resources acquired by
|
|
|
|
* sysfs_addrm_start() are released and removed sysfs_dirents are
|
2009-11-20 19:08:55 -05:00
|
|
|
* cleaned up.
|
2007-06-13 15:27:24 -04:00
|
|
|
*
|
|
|
|
* LOCKING:
|
2009-11-20 19:08:55 -05:00
|
|
|
* sysfs_mutex is released.
|
2007-06-13 15:27:24 -04:00
|
|
|
*/
|
2007-08-02 08:38:03 -04:00
|
|
|
void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt)
|
2007-06-13 15:27:24 -04:00
|
|
|
{
|
|
|
|
/* release resources acquired by sysfs_addrm_start() */
|
|
|
|
mutex_unlock(&sysfs_mutex);
|
|
|
|
|
|
|
|
/* kill removed sysfs_dirents */
|
|
|
|
while (acxt->removed) {
|
|
|
|
struct sysfs_dirent *sd = acxt->removed;
|
|
|
|
|
|
|
|
acxt->removed = sd->s_sibling;
|
|
|
|
sd->s_sibling = NULL;
|
|
|
|
|
|
|
|
sysfs_deactivate(sd);
|
2009-03-04 14:57:20 -05:00
|
|
|
unmap_bin_file(sd);
|
2007-06-13 15:27:24 -04:00
|
|
|
sysfs_put(sd);
|
2007-06-13 14:45:14 -04:00
|
|
|
}
|
2007-01-24 14:35:52 -05:00
|
|
|
}
|
|
|
|
|
2007-06-13 15:27:22 -04:00
|
|
|
/**
|
|
|
|
* sysfs_find_dirent - find sysfs_dirent with the given name
|
|
|
|
* @parent_sd: sysfs_dirent to search under
|
|
|
|
* @name: name to look for
|
|
|
|
*
|
|
|
|
* Look for sysfs_dirent with name @name under @parent_sd.
|
2006-03-09 09:10:14 -05:00
|
|
|
*
|
2007-06-13 15:27:22 -04:00
|
|
|
* LOCKING:
|
2007-06-13 15:27:23 -04:00
|
|
|
* mutex_lock(sysfs_mutex)
|
2006-03-09 09:10:14 -05:00
|
|
|
*
|
2007-06-13 15:27:22 -04:00
|
|
|
* RETURNS:
|
|
|
|
* Pointer to sysfs_dirent if found, NULL if not.
|
2006-03-09 09:10:14 -05:00
|
|
|
*/
|
2007-06-13 15:27:22 -04:00
|
|
|
struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,
|
|
|
|
const unsigned char *name)
|
2006-03-09 09:10:14 -05:00
|
|
|
{
|
2007-06-13 15:27:22 -04:00
|
|
|
struct sysfs_dirent *sd;
|
|
|
|
|
2007-09-20 03:05:12 -04:00
|
|
|
for (sd = parent_sd->s_dir.children; sd; sd = sd->s_sibling)
|
2007-08-20 08:36:30 -04:00
|
|
|
if (!strcmp(sd->s_name, name))
|
2007-06-13 15:27:22 -04:00
|
|
|
return sd;
|
|
|
|
return NULL;
|
|
|
|
}
|
2006-03-09 09:10:14 -05:00
|
|
|
|
2007-06-13 15:27:22 -04:00
|
|
|
/**
|
|
|
|
* sysfs_get_dirent - find and get sysfs_dirent with the given name
|
|
|
|
* @parent_sd: sysfs_dirent to search under
|
|
|
|
* @name: name to look for
|
|
|
|
*
|
|
|
|
* Look for sysfs_dirent with name @name under @parent_sd and get
|
|
|
|
* it if found.
|
|
|
|
*
|
|
|
|
* LOCKING:
|
2007-06-13 15:27:23 -04:00
|
|
|
* Kernel thread context (may sleep). Grabs sysfs_mutex.
|
2007-06-13 15:27:22 -04:00
|
|
|
*
|
|
|
|
* RETURNS:
|
|
|
|
* Pointer to sysfs_dirent if found, NULL if not.
|
|
|
|
*/
|
|
|
|
struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
|
|
|
|
const unsigned char *name)
|
|
|
|
{
|
|
|
|
struct sysfs_dirent *sd;
|
|
|
|
|
2007-06-13 15:27:23 -04:00
|
|
|
mutex_lock(&sysfs_mutex);
|
2007-06-13 15:27:22 -04:00
|
|
|
sd = sysfs_find_dirent(parent_sd, name);
|
|
|
|
sysfs_get(sd);
|
2007-06-13 15:27:23 -04:00
|
|
|
mutex_unlock(&sysfs_mutex);
|
2007-06-13 15:27:22 -04:00
|
|
|
|
|
|
|
return sd;
|
2006-03-09 09:10:14 -05:00
|
|
|
}
|
2008-07-15 18:58:04 -04:00
|
|
|
EXPORT_SYMBOL_GPL(sysfs_get_dirent);
|
2006-03-09 09:10:14 -05:00
|
|
|
|
2007-06-13 15:27:22 -04:00
|
|
|
static int create_dir(struct kobject *kobj, struct sysfs_dirent *parent_sd,
|
|
|
|
const char *name, struct sysfs_dirent **p_sd)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
|
|
|
umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO;
|
2007-06-13 15:27:25 -04:00
|
|
|
struct sysfs_addrm_cxt acxt;
|
2007-06-13 14:45:14 -04:00
|
|
|
struct sysfs_dirent *sd;
|
2007-08-02 08:38:03 -04:00
|
|
|
int rc;
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2007-06-13 14:45:17 -04:00
|
|
|
/* allocate */
|
2007-06-13 14:45:15 -04:00
|
|
|
sd = sysfs_new_dirent(name, mode, SYSFS_DIR);
|
2007-06-13 14:45:14 -04:00
|
|
|
if (!sd)
|
2007-06-13 15:27:25 -04:00
|
|
|
return -ENOMEM;
|
2007-09-20 03:05:11 -04:00
|
|
|
sd->s_dir.kobj = kobj;
|
2007-06-13 14:45:14 -04:00
|
|
|
|
2007-06-13 14:45:17 -04:00
|
|
|
/* link in */
|
2007-06-13 15:27:25 -04:00
|
|
|
sysfs_addrm_start(&acxt, parent_sd);
|
2007-08-02 08:38:03 -04:00
|
|
|
rc = sysfs_add_one(&acxt, sd);
|
|
|
|
sysfs_addrm_finish(&acxt);
|
2007-07-18 03:38:11 -04:00
|
|
|
|
2007-08-02 08:38:03 -04:00
|
|
|
if (rc == 0)
|
|
|
|
*p_sd = sd;
|
|
|
|
else
|
2007-07-18 03:38:11 -04:00
|
|
|
sysfs_put(sd);
|
2007-06-13 14:45:14 -04:00
|
|
|
|
2007-08-02 08:38:03 -04:00
|
|
|
return rc;
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
2007-06-13 15:27:22 -04:00
|
|
|
int sysfs_create_subdir(struct kobject *kobj, const char *name,
|
|
|
|
struct sysfs_dirent **p_sd)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
2007-06-13 15:27:22 -04:00
|
|
|
return create_dir(kobj, kobj->sd, name, p_sd);
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* sysfs_create_dir - create a directory for an object.
|
|
|
|
* @kobj: object we're creating directory for.
|
|
|
|
*/
|
2007-07-31 06:15:08 -04:00
|
|
|
int sysfs_create_dir(struct kobject * kobj)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
2007-06-13 15:27:22 -04:00
|
|
|
struct sysfs_dirent *parent_sd, *sd;
|
2005-04-16 18:20:36 -04:00
|
|
|
int error = 0;
|
|
|
|
|
|
|
|
BUG_ON(!kobj);
|
|
|
|
|
2007-07-31 06:15:08 -04:00
|
|
|
if (kobj->parent)
|
2007-06-13 15:27:22 -04:00
|
|
|
parent_sd = kobj->parent->sd;
|
2005-04-16 18:20:36 -04:00
|
|
|
else
|
2007-08-20 08:36:30 -04:00
|
|
|
parent_sd = &sysfs_root;
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2007-06-13 15:27:22 -04:00
|
|
|
error = create_dir(kobj, parent_sd, kobject_name(kobj), &sd);
|
2005-04-16 18:20:36 -04:00
|
|
|
if (!error)
|
2007-06-13 15:27:22 -04:00
|
|
|
kobj->sd = sd;
|
2005-04-16 18:20:36 -04:00
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry,
|
|
|
|
struct nameidata *nd)
|
|
|
|
{
|
2007-07-31 06:15:08 -04:00
|
|
|
struct dentry *ret = NULL;
|
2007-08-02 08:38:02 -04:00
|
|
|
struct sysfs_dirent *parent_sd = dentry->d_parent->d_fsdata;
|
|
|
|
struct sysfs_dirent *sd;
|
2007-06-13 14:45:17 -04:00
|
|
|
struct inode *inode;
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2007-07-31 06:15:08 -04:00
|
|
|
mutex_lock(&sysfs_mutex);
|
|
|
|
|
2007-08-20 08:36:30 -04:00
|
|
|
sd = sysfs_find_dirent(parent_sd, dentry->d_name.name);
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2007-06-13 14:45:17 -04:00
|
|
|
/* no such entry */
|
2008-01-15 22:06:14 -05:00
|
|
|
if (!sd) {
|
|
|
|
ret = ERR_PTR(-ENOENT);
|
2007-07-31 06:15:08 -04:00
|
|
|
goto out_unlock;
|
2008-01-15 22:06:14 -05:00
|
|
|
}
|
2007-06-13 14:45:17 -04:00
|
|
|
|
|
|
|
/* attach dentry and inode */
|
2007-06-13 14:45:17 -04:00
|
|
|
inode = sysfs_get_inode(sd);
|
2007-07-31 06:15:08 -04:00
|
|
|
if (!inode) {
|
|
|
|
ret = ERR_PTR(-ENOMEM);
|
|
|
|
goto out_unlock;
|
|
|
|
}
|
2007-06-13 15:27:23 -04:00
|
|
|
|
2007-09-20 03:05:11 -04:00
|
|
|
/* instantiate and hash dentry */
|
2009-11-20 19:08:56 -05:00
|
|
|
ret = d_find_alias(inode);
|
|
|
|
if (!ret) {
|
|
|
|
dentry->d_op = &sysfs_dentry_ops;
|
|
|
|
dentry->d_fsdata = sysfs_get(sd);
|
|
|
|
d_add(dentry, inode);
|
|
|
|
} else {
|
|
|
|
d_move(ret, dentry);
|
|
|
|
iput(inode);
|
|
|
|
}
|
2007-06-13 14:45:17 -04:00
|
|
|
|
2007-07-31 06:15:08 -04:00
|
|
|
out_unlock:
|
2007-06-13 15:27:23 -04:00
|
|
|
mutex_unlock(&sysfs_mutex);
|
2007-07-31 06:15:08 -04:00
|
|
|
return ret;
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
2007-02-12 03:55:40 -05:00
|
|
|
const struct inode_operations sysfs_dir_inode_operations = {
|
2005-04-16 18:20:36 -04:00
|
|
|
.lookup = sysfs_lookup,
|
2009-11-20 19:08:53 -05:00
|
|
|
.permission = sysfs_permission,
|
2005-05-31 01:09:14 -04:00
|
|
|
.setattr = sysfs_setattr,
|
2009-11-20 19:08:53 -05:00
|
|
|
.getattr = sysfs_getattr,
|
2009-09-09 14:25:37 -04:00
|
|
|
.setxattr = sysfs_setxattr,
|
2005-04-16 18:20:36 -04:00
|
|
|
};
|
|
|
|
|
2007-06-13 15:27:22 -04:00
|
|
|
static void remove_dir(struct sysfs_dirent *sd)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
2007-06-13 15:27:24 -04:00
|
|
|
struct sysfs_addrm_cxt acxt;
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2007-06-13 15:27:24 -04:00
|
|
|
sysfs_addrm_start(&acxt, sd->s_parent);
|
|
|
|
sysfs_remove_one(&acxt, sd);
|
|
|
|
sysfs_addrm_finish(&acxt);
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
2007-06-13 15:27:22 -04:00
|
|
|
void sysfs_remove_subdir(struct sysfs_dirent *sd)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
2007-06-13 15:27:22 -04:00
|
|
|
remove_dir(sd);
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2007-06-13 15:27:22 -04:00
|
|
|
static void __sysfs_remove_dir(struct sysfs_dirent *dir_sd)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
2007-06-13 15:27:24 -04:00
|
|
|
struct sysfs_addrm_cxt acxt;
|
2007-06-13 14:45:18 -04:00
|
|
|
struct sysfs_dirent **pos;
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2007-06-13 15:27:22 -04:00
|
|
|
if (!dir_sd)
|
2005-04-16 18:20:36 -04:00
|
|
|
return;
|
|
|
|
|
2007-06-13 15:27:22 -04:00
|
|
|
pr_debug("sysfs %s: removing dir\n", dir_sd->s_name);
|
2007-06-13 15:27:24 -04:00
|
|
|
sysfs_addrm_start(&acxt, dir_sd);
|
2007-09-20 03:05:12 -04:00
|
|
|
pos = &dir_sd->s_dir.children;
|
2007-06-13 14:45:18 -04:00
|
|
|
while (*pos) {
|
|
|
|
struct sysfs_dirent *sd = *pos;
|
|
|
|
|
2007-08-20 08:36:30 -04:00
|
|
|
if (sysfs_type(sd) != SYSFS_DIR)
|
2007-06-13 15:27:24 -04:00
|
|
|
sysfs_remove_one(&acxt, sd);
|
2007-08-02 08:38:03 -04:00
|
|
|
else
|
2007-06-13 14:45:18 -04:00
|
|
|
pos = &(*pos)->s_sibling;
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
2007-06-13 15:27:24 -04:00
|
|
|
sysfs_addrm_finish(&acxt);
|
2007-06-13 14:45:16 -04:00
|
|
|
|
2007-06-13 15:27:22 -04:00
|
|
|
remove_dir(dir_sd);
|
2007-01-24 14:35:52 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* sysfs_remove_dir - remove an object's directory.
|
|
|
|
* @kobj: object.
|
|
|
|
*
|
|
|
|
* The only thing special about this is that we remove any files in
|
|
|
|
* the directory before we remove the directory, and we've inlined
|
|
|
|
* what used to be sysfs_rmdir() below, instead of calling separately.
|
|
|
|
*/
|
|
|
|
|
|
|
|
void sysfs_remove_dir(struct kobject * kobj)
|
|
|
|
{
|
2007-06-13 15:27:22 -04:00
|
|
|
struct sysfs_dirent *sd = kobj->sd;
|
2007-06-13 14:45:15 -04:00
|
|
|
|
2007-06-13 15:27:23 -04:00
|
|
|
spin_lock(&sysfs_assoc_lock);
|
2007-06-13 15:27:22 -04:00
|
|
|
kobj->sd = NULL;
|
2007-06-13 15:27:23 -04:00
|
|
|
spin_unlock(&sysfs_assoc_lock);
|
2007-06-13 14:45:15 -04:00
|
|
|
|
2007-06-13 15:27:22 -04:00
|
|
|
__sysfs_remove_dir(sd);
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
2009-11-20 19:08:57 -05:00
|
|
|
int sysfs_rename(struct sysfs_dirent *sd,
|
|
|
|
struct sysfs_dirent *new_parent_sd, const char *new_name)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
2007-06-13 15:27:25 -04:00
|
|
|
const char *dup_name = NULL;
|
2007-06-13 14:45:14 -04:00
|
|
|
int error;
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2009-11-20 19:08:56 -05:00
|
|
|
mutex_lock(&sysfs_mutex);
|
2007-08-20 08:36:30 -04:00
|
|
|
|
2007-08-20 08:36:31 -04:00
|
|
|
error = 0;
|
2009-11-20 19:08:57 -05:00
|
|
|
if ((sd->s_parent == new_parent_sd) &&
|
|
|
|
(strcmp(sd->s_name, new_name) == 0))
|
2007-08-20 08:36:31 -04:00
|
|
|
goto out; /* nothing to rename */
|
|
|
|
|
|
|
|
error = -EEXIST;
|
2009-11-20 19:08:57 -05:00
|
|
|
if (sysfs_find_dirent(new_parent_sd, new_name))
|
2009-11-20 19:08:56 -05:00
|
|
|
goto out;
|
2007-06-13 14:45:14 -04:00
|
|
|
|
2008-07-03 21:05:28 -04:00
|
|
|
/* rename sysfs_dirent */
|
2009-11-20 19:08:57 -05:00
|
|
|
if (strcmp(sd->s_name, new_name) != 0) {
|
|
|
|
error = -ENOMEM;
|
|
|
|
new_name = dup_name = kstrdup(new_name, GFP_KERNEL);
|
|
|
|
if (!new_name)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
dup_name = sd->s_name;
|
|
|
|
sd->s_name = new_name;
|
|
|
|
}
|
2007-06-13 14:45:15 -04:00
|
|
|
|
2009-11-20 19:08:57 -05:00
|
|
|
/* Remove from old parent's list and insert into new parent's list. */
|
|
|
|
if (sd->s_parent != new_parent_sd) {
|
|
|
|
sysfs_unlink_sibling(sd);
|
|
|
|
sysfs_get(new_parent_sd);
|
|
|
|
sysfs_put(sd->s_parent);
|
|
|
|
sd->s_parent = new_parent_sd;
|
|
|
|
sysfs_link_sibling(sd);
|
|
|
|
}
|
2007-06-13 14:45:15 -04:00
|
|
|
|
2007-06-13 14:45:14 -04:00
|
|
|
error = 0;
|
2009-11-20 19:08:56 -05:00
|
|
|
out:
|
2007-08-20 08:36:31 -04:00
|
|
|
mutex_unlock(&sysfs_mutex);
|
2007-06-13 15:27:25 -04:00
|
|
|
kfree(dup_name);
|
2005-04-16 18:20:36 -04:00
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
2009-11-20 19:08:57 -05:00
|
|
|
int sysfs_rename_dir(struct kobject *kobj, const char *new_name)
|
|
|
|
{
|
|
|
|
return sysfs_rename(kobj->sd, kobj->sd->s_parent, new_name);
|
|
|
|
}
|
|
|
|
|
2007-06-13 15:27:25 -04:00
|
|
|
int sysfs_move_dir(struct kobject *kobj, struct kobject *new_parent_kobj)
|
2006-11-20 11:07:51 -05:00
|
|
|
{
|
2007-06-13 15:27:25 -04:00
|
|
|
struct sysfs_dirent *sd = kobj->sd;
|
|
|
|
struct sysfs_dirent *new_parent_sd;
|
2006-11-20 11:07:51 -05:00
|
|
|
|
2007-06-13 15:27:25 -04:00
|
|
|
BUG_ON(!sd->s_parent);
|
2009-11-20 19:08:57 -05:00
|
|
|
new_parent_sd = new_parent_kobj && new_parent_kobj->sd ?
|
2009-10-06 09:33:35 -04:00
|
|
|
new_parent_kobj->sd : &sysfs_root;
|
2007-06-13 15:27:25 -04:00
|
|
|
|
2009-11-20 19:08:57 -05:00
|
|
|
return sysfs_rename(sd, new_parent_sd, sd->s_name);
|
2006-11-20 11:07:51 -05:00
|
|
|
}
|
|
|
|
|
2005-04-16 18:20:36 -04:00
|
|
|
/* Relationship between s_mode and the DT_xxx types */
|
|
|
|
static inline unsigned char dt_type(struct sysfs_dirent *sd)
|
|
|
|
{
|
|
|
|
return (sd->s_mode >> 12) & 15;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
|
|
|
|
{
|
2006-12-08 05:36:36 -05:00
|
|
|
struct dentry *dentry = filp->f_path.dentry;
|
2005-04-16 18:20:36 -04:00
|
|
|
struct sysfs_dirent * parent_sd = dentry->d_fsdata;
|
2007-08-20 08:36:30 -04:00
|
|
|
struct sysfs_dirent *pos;
|
2005-04-16 18:20:36 -04:00
|
|
|
ino_t ino;
|
|
|
|
|
2007-08-20 08:36:30 -04:00
|
|
|
if (filp->f_pos == 0) {
|
|
|
|
ino = parent_sd->s_ino;
|
|
|
|
if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) == 0)
|
2005-04-16 18:20:36 -04:00
|
|
|
filp->f_pos++;
|
2007-08-20 08:36:30 -04:00
|
|
|
}
|
|
|
|
if (filp->f_pos == 1) {
|
|
|
|
if (parent_sd->s_parent)
|
|
|
|
ino = parent_sd->s_parent->s_ino;
|
|
|
|
else
|
|
|
|
ino = parent_sd->s_ino;
|
|
|
|
if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) == 0)
|
2005-04-16 18:20:36 -04:00
|
|
|
filp->f_pos++;
|
2007-08-20 08:36:30 -04:00
|
|
|
}
|
|
|
|
if ((filp->f_pos > 1) && (filp->f_pos < INT_MAX)) {
|
|
|
|
mutex_lock(&sysfs_mutex);
|
2007-06-13 14:45:18 -04:00
|
|
|
|
2007-08-20 08:36:30 -04:00
|
|
|
/* Skip the dentries we have already reported */
|
2007-09-20 03:05:12 -04:00
|
|
|
pos = parent_sd->s_dir.children;
|
2007-08-20 08:36:30 -04:00
|
|
|
while (pos && (filp->f_pos > pos->s_ino))
|
|
|
|
pos = pos->s_sibling;
|
2007-06-13 15:27:23 -04:00
|
|
|
|
2007-08-20 08:36:30 -04:00
|
|
|
for ( ; pos; pos = pos->s_sibling) {
|
|
|
|
const char * name;
|
|
|
|
int len;
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2007-08-20 08:36:30 -04:00
|
|
|
name = pos->s_name;
|
|
|
|
len = strlen(name);
|
|
|
|
filp->f_pos = ino = pos->s_ino;
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2007-08-20 08:36:30 -04:00
|
|
|
if (filldir(dirent, name, len, filp->f_pos, ino,
|
|
|
|
dt_type(pos)) < 0)
|
2005-04-16 18:20:36 -04:00
|
|
|
break;
|
|
|
|
}
|
2007-08-20 08:36:30 -04:00
|
|
|
if (!pos)
|
|
|
|
filp->f_pos = INT_MAX;
|
2007-06-13 15:27:23 -04:00
|
|
|
mutex_unlock(&sysfs_mutex);
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
2007-08-20 08:36:30 -04:00
|
|
|
return 0;
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
2007-08-20 08:36:30 -04:00
|
|
|
|
2006-03-28 04:56:42 -05:00
|
|
|
const struct file_operations sysfs_dir_operations = {
|
2005-04-16 18:20:36 -04:00
|
|
|
.read = generic_read_dir,
|
|
|
|
.readdir = sysfs_readdir,
|
2008-09-03 15:53:01 -04:00
|
|
|
.llseek = generic_file_llseek,
|
2005-04-16 18:20:36 -04:00
|
|
|
};
|