2005-04-17 06:20:36 +08:00
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/*
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* dir.c - Operations for sysfs directories.
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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 15:09:12 +08:00
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#include <linux/namei.h>
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2007-06-14 02:45:13 +08:00
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#include <linux/idr.h>
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2007-06-14 02:45:18 +08:00
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#include <linux/completion.h>
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2006-12-20 17:52:44 +08:00
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#include <asm/semaphore.h>
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2005-04-17 06:20:36 +08:00
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#include "sysfs.h"
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2007-06-14 03:27:23 +08:00
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DEFINE_MUTEX(sysfs_mutex);
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2007-06-14 03:27:23 +08:00
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spinlock_t sysfs_assoc_lock = SPIN_LOCK_UNLOCKED;
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2005-04-17 06:20:36 +08:00
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2007-06-14 02:45:13 +08:00
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static spinlock_t sysfs_ino_lock = SPIN_LOCK_UNLOCKED;
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static DEFINE_IDA(sysfs_ino_ida);
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2007-06-14 02:45:18 +08:00
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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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* sd->s_parent->s_children.
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*
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* Locking:
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2007-06-14 03:27:23 +08:00
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* mutex_lock(sysfs_mutex)
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2007-06-14 02:45:18 +08:00
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*/
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2007-06-14 03:27:24 +08:00
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void sysfs_link_sibling(struct sysfs_dirent *sd)
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2007-06-14 02:45:18 +08:00
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{
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struct sysfs_dirent *parent_sd = sd->s_parent;
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BUG_ON(sd->s_sibling);
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sd->s_sibling = parent_sd->s_children;
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parent_sd->s_children = sd;
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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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* sd->s_parent->s_children.
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*
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* Locking:
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2007-06-14 03:27:23 +08:00
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* mutex_lock(sysfs_mutex)
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2007-06-14 02:45:18 +08:00
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*/
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2007-06-14 03:27:24 +08:00
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void sysfs_unlink_sibling(struct sysfs_dirent *sd)
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2007-06-14 02:45:18 +08:00
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{
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struct sysfs_dirent **pos;
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for (pos = &sd->s_parent->s_children; *pos; pos = &(*pos)->s_sibling) {
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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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2007-06-14 03:27:25 +08:00
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/**
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* sysfs_get_dentry - get dentry for the given sysfs_dirent
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* @sd: sysfs_dirent of interest
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*
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* Get dentry for @sd. Dentry is looked up if currently not
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* present. This function climbs sysfs_dirent tree till it
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* reaches a sysfs_dirent with valid dentry attached and descends
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* down from there looking up dentry for each step.
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*
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* LOCKING:
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* Kernel thread context (may sleep)
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*
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* RETURNS:
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* Pointer to found dentry on success, ERR_PTR() value on error.
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*/
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struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd)
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{
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struct sysfs_dirent *cur;
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struct dentry *parent_dentry, *dentry;
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int i, depth;
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/* Find the first parent which has valid s_dentry and get the
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* dentry.
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*/
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mutex_lock(&sysfs_mutex);
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restart0:
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spin_lock(&sysfs_assoc_lock);
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restart1:
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spin_lock(&dcache_lock);
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dentry = NULL;
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depth = 0;
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cur = sd;
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while (!cur->s_dentry || !cur->s_dentry->d_inode) {
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if (cur->s_flags & SYSFS_FLAG_REMOVED) {
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dentry = ERR_PTR(-ENOENT);
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depth = 0;
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break;
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}
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cur = cur->s_parent;
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depth++;
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}
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if (!IS_ERR(dentry))
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dentry = dget_locked(cur->s_dentry);
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spin_unlock(&dcache_lock);
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spin_unlock(&sysfs_assoc_lock);
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/* from the found dentry, look up depth times */
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while (depth--) {
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/* find and get depth'th ancestor */
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for (cur = sd, i = 0; cur && i < depth; i++)
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cur = cur->s_parent;
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/* This can happen if tree structure was modified due
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* to move/rename. Restart.
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*/
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if (i != depth) {
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dput(dentry);
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goto restart0;
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}
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sysfs_get(cur);
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mutex_unlock(&sysfs_mutex);
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/* look it up */
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parent_dentry = dentry;
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dentry = lookup_one_len_kern(cur->s_name, parent_dentry,
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strlen(cur->s_name));
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dput(parent_dentry);
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if (IS_ERR(dentry)) {
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sysfs_put(cur);
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return dentry;
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}
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mutex_lock(&sysfs_mutex);
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spin_lock(&sysfs_assoc_lock);
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/* This, again, can happen if tree structure has
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* changed and we looked up the wrong thing. Restart.
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*/
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if (cur->s_dentry != dentry) {
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dput(dentry);
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sysfs_put(cur);
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goto restart1;
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}
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spin_unlock(&sysfs_assoc_lock);
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sysfs_put(cur);
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}
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mutex_unlock(&sysfs_mutex);
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return dentry;
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}
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2007-06-14 02:45:18 +08:00
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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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struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd)
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{
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2007-06-14 02:45:18 +08:00
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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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if (likely(t == v))
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return sd;
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if (t < 0)
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return NULL;
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cpu_relax();
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2007-06-14 02:45:18 +08:00
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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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void sysfs_put_active(struct sysfs_dirent *sd)
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{
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2007-06-14 02:45:18 +08:00
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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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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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2007-06-14 02:45:18 +08:00
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* sd->s_sibling.
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2007-06-14 02:45:18 +08:00
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*/
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2007-06-14 02:45:18 +08:00
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cmpl = (void *)sd->s_sibling;
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2007-06-14 02:45:18 +08:00
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complete(cmpl);
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2007-06-14 02:45:18 +08:00
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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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2007-06-14 02:45:18 +08:00
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* Deny new active references and drain existing ones.
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2007-06-14 02:45:18 +08:00
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*/
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2007-06-14 03:27:24 +08:00
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static void sysfs_deactivate(struct sysfs_dirent *sd)
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2007-06-14 02:45:18 +08:00
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{
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2007-06-14 02:45:18 +08:00
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DECLARE_COMPLETION_ONSTACK(wait);
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int v;
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2007-06-14 02:45:18 +08:00
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2007-06-14 03:27:22 +08:00
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BUG_ON(sd->s_sibling || !(sd->s_flags & SYSFS_FLAG_REMOVED));
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2007-06-14 02:45:18 +08:00
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sd->s_sibling = (void *)&wait;
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2007-06-14 02:45:18 +08:00
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/* atomic_add_return() is a mb(), put_active() will always see
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2007-06-14 02:45:18 +08:00
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* the updated sd->s_sibling.
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2007-06-14 02:45:18 +08:00
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*/
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2007-06-14 02:45:18 +08:00
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v = atomic_add_return(SD_DEACTIVATED_BIAS, &sd->s_active);
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if (v != SD_DEACTIVATED_BIAS)
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wait_for_completion(&wait);
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2007-06-14 02:45:18 +08:00
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sd->s_sibling = NULL;
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2007-06-14 02:45:18 +08:00
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}
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2007-06-14 02:45:17 +08:00
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static int sysfs_alloc_ino(ino_t *pino)
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2007-06-14 02:45:13 +08:00
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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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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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|
2007-06-14 02:45:13 +08:00
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void release_sysfs_dirent(struct sysfs_dirent * sd)
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{
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2007-06-14 02:45:14 +08:00
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struct sysfs_dirent *parent_sd;
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repeat:
|
2007-06-14 03:27:23 +08:00
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/* Moving/renaming is always done while holding reference.
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* sd->s_parent won't change beneath us.
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*/
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2007-06-14 02:45:14 +08:00
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parent_sd = sd->s_parent;
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2007-06-14 03:27:21 +08:00
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if (sysfs_type(sd) == SYSFS_KOBJ_LINK)
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2007-06-14 02:45:15 +08:00
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sysfs_put(sd->s_elem.symlink.target_sd);
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2007-06-14 03:27:21 +08:00
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if (sysfs_type(sd) & SYSFS_COPY_NAME)
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2007-06-14 02:45:15 +08:00
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kfree(sd->s_name);
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2007-06-14 02:45:13 +08:00
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kfree(sd->s_iattr);
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2007-06-14 02:45:13 +08:00
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sysfs_free_ino(sd->s_ino);
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2007-06-14 02:45:13 +08:00
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kmem_cache_free(sysfs_dir_cachep, sd);
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2007-06-14 02:45:14 +08:00
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sd = parent_sd;
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if (sd && atomic_dec_and_test(&sd->s_count))
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goto repeat;
|
2007-06-14 02:45:13 +08:00
|
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}
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|
2005-04-17 06:20:36 +08:00
|
|
|
static void sysfs_d_iput(struct dentry * dentry, struct inode * inode)
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{
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struct sysfs_dirent * sd = dentry->d_fsdata;
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if (sd) {
|
2007-06-14 03:27:23 +08:00
|
|
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/* sd->s_dentry is protected with sysfs_assoc_lock.
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* This allows sysfs_drop_dentry() to dereference it.
|
2007-06-11 13:04:01 +08:00
|
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*/
|
2007-06-14 03:27:23 +08:00
|
|
|
spin_lock(&sysfs_assoc_lock);
|
2007-06-11 13:04:01 +08:00
|
|
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|
|
/* The dentry might have been deleted or another
|
|
|
|
* lookup could have happened updating sd->s_dentry to
|
|
|
|
* point the new dentry. Ignore if it isn't pointing
|
|
|
|
* to this dentry.
|
|
|
|
*/
|
|
|
|
if (sd->s_dentry == dentry)
|
|
|
|
sd->s_dentry = NULL;
|
2007-06-14 03:27:23 +08:00
|
|
|
spin_unlock(&sysfs_assoc_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
sysfs_put(sd);
|
|
|
|
}
|
|
|
|
iput(inode);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct dentry_operations sysfs_dentry_ops = {
|
|
|
|
.d_iput = sysfs_d_iput,
|
|
|
|
};
|
|
|
|
|
2007-06-14 02:45:15 +08:00
|
|
|
struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2007-06-14 02:45:15 +08:00
|
|
|
char *dup_name = NULL;
|
|
|
|
struct sysfs_dirent *sd = NULL;
|
|
|
|
|
|
|
|
if (type & SYSFS_COPY_NAME) {
|
|
|
|
name = dup_name = kstrdup(name, GFP_KERNEL);
|
|
|
|
if (!name)
|
|
|
|
goto err_out;
|
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-02-10 17:45:03 +08:00
|
|
|
sd = kmem_cache_zalloc(sysfs_dir_cachep, GFP_KERNEL);
|
2005-04-17 06:20:36 +08:00
|
|
|
if (!sd)
|
2007-06-14 02:45:15 +08:00
|
|
|
goto err_out;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-06-14 02:45:15 +08:00
|
|
|
if (sysfs_alloc_ino(&sd->s_ino))
|
|
|
|
goto err_out;
|
2007-06-14 02:45:13 +08:00
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
atomic_set(&sd->s_count, 1);
|
2007-06-14 02:45:18 +08:00
|
|
|
atomic_set(&sd->s_active, 0);
|
2006-08-04 00:06:25 +08:00
|
|
|
atomic_set(&sd->s_event, 1);
|
2007-06-14 02:45:14 +08:00
|
|
|
|
2007-06-14 02:45:15 +08:00
|
|
|
sd->s_name = name;
|
2007-06-14 02:45:14 +08:00
|
|
|
sd->s_mode = mode;
|
2007-06-14 03:27:21 +08:00
|
|
|
sd->s_flags = type;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
return sd;
|
2007-06-14 02:45:15 +08:00
|
|
|
|
|
|
|
err_out:
|
|
|
|
kfree(dup_name);
|
|
|
|
kmem_cache_free(sysfs_dir_cachep, sd);
|
|
|
|
return NULL;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2007-06-14 03:27:23 +08:00
|
|
|
/**
|
|
|
|
* sysfs_attach_dentry - associate sysfs_dirent with dentry
|
|
|
|
* @sd: target sysfs_dirent
|
|
|
|
* @dentry: dentry to associate
|
|
|
|
*
|
|
|
|
* Associate @sd with @dentry. This is protected by
|
|
|
|
* sysfs_assoc_lock to avoid race with sysfs_d_iput().
|
|
|
|
*
|
|
|
|
* LOCKING:
|
|
|
|
* mutex_lock(sysfs_mutex)
|
|
|
|
*/
|
2007-06-14 02:45:16 +08:00
|
|
|
static void sysfs_attach_dentry(struct sysfs_dirent *sd, struct dentry *dentry)
|
|
|
|
{
|
|
|
|
dentry->d_op = &sysfs_dentry_ops;
|
|
|
|
dentry->d_fsdata = sysfs_get(sd);
|
|
|
|
|
|
|
|
/* protect sd->s_dentry against sysfs_d_iput */
|
2007-06-14 03:27:23 +08:00
|
|
|
spin_lock(&sysfs_assoc_lock);
|
2007-06-14 02:45:16 +08:00
|
|
|
sd->s_dentry = dentry;
|
2007-06-14 03:27:23 +08:00
|
|
|
spin_unlock(&sysfs_assoc_lock);
|
2007-06-14 02:45:16 +08:00
|
|
|
|
|
|
|
d_rehash(dentry);
|
|
|
|
}
|
|
|
|
|
2007-06-14 03:27:24 +08:00
|
|
|
static int sysfs_ilookup_test(struct inode *inode, void *arg)
|
|
|
|
{
|
|
|
|
struct sysfs_dirent *sd = arg;
|
|
|
|
return inode->i_ino == sd->s_ino;
|
|
|
|
}
|
|
|
|
|
2007-06-14 03:27:23 +08:00
|
|
|
/**
|
2007-06-14 03:27:24 +08:00
|
|
|
* sysfs_addrm_start - prepare for sysfs_dirent add/remove
|
|
|
|
* @acxt: pointer to sysfs_addrm_cxt to be used
|
|
|
|
* @parent_sd: parent sysfs_dirent
|
2007-06-14 03:27:23 +08:00
|
|
|
*
|
2007-06-14 03:27:24 +08:00
|
|
|
* This function is called when the caller is about to add or
|
|
|
|
* remove sysfs_dirent under @parent_sd. This function acquires
|
|
|
|
* sysfs_mutex, grabs inode for @parent_sd if available and lock
|
|
|
|
* i_mutex of it. @acxt is used to keep and pass context to
|
|
|
|
* other addrm functions.
|
2007-06-14 03:27:23 +08:00
|
|
|
*
|
|
|
|
* LOCKING:
|
2007-06-14 03:27:24 +08:00
|
|
|
* Kernel thread context (may sleep). sysfs_mutex is locked on
|
|
|
|
* return. i_mutex of parent inode is locked on return if
|
|
|
|
* available.
|
2007-06-14 03:27:23 +08:00
|
|
|
*/
|
2007-06-14 03:27:24 +08:00
|
|
|
void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt,
|
|
|
|
struct sysfs_dirent *parent_sd)
|
2007-01-25 03:35:52 +08:00
|
|
|
{
|
2007-06-14 03:27:24 +08:00
|
|
|
struct inode *inode;
|
2007-01-25 03:35:52 +08:00
|
|
|
|
2007-06-14 03:27:24 +08:00
|
|
|
memset(acxt, 0, sizeof(*acxt));
|
|
|
|
acxt->parent_sd = parent_sd;
|
|
|
|
|
|
|
|
/* Lookup parent inode. inode initialization and I_NEW
|
|
|
|
* clearing are protected by sysfs_mutex. By grabbing it and
|
|
|
|
* looking up with _nowait variant, inode state can be
|
|
|
|
* determined reliably.
|
|
|
|
*/
|
|
|
|
mutex_lock(&sysfs_mutex);
|
|
|
|
|
|
|
|
inode = ilookup5_nowait(sysfs_sb, parent_sd->s_ino, sysfs_ilookup_test,
|
|
|
|
parent_sd);
|
|
|
|
|
|
|
|
if (inode && !(inode->i_state & I_NEW)) {
|
|
|
|
/* parent inode available */
|
|
|
|
acxt->parent_inode = inode;
|
|
|
|
|
|
|
|
/* sysfs_mutex is below i_mutex in lock hierarchy.
|
|
|
|
* First, trylock i_mutex. If fails, unlock
|
|
|
|
* sysfs_mutex and lock them in order.
|
|
|
|
*/
|
|
|
|
if (!mutex_trylock(&inode->i_mutex)) {
|
|
|
|
mutex_unlock(&sysfs_mutex);
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
|
|
mutex_lock(&sysfs_mutex);
|
|
|
|
}
|
|
|
|
} else
|
|
|
|
iput(inode);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* 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. @sd is NOT
|
|
|
|
* linked into the children list of the parent. The caller
|
|
|
|
* should invoke sysfs_link_sibling() after this function
|
|
|
|
* completes if @sd needs to be on the children list.
|
|
|
|
*
|
|
|
|
* 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_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
|
|
|
|
{
|
|
|
|
sd->s_parent = sysfs_get(acxt->parent_sd);
|
|
|
|
|
|
|
|
if (sysfs_type(sd) == SYSFS_DIR && acxt->parent_inode)
|
|
|
|
inc_nlink(acxt->parent_inode);
|
|
|
|
|
|
|
|
acxt->cnt++;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* sysfs_remove_one - remove sysfs_dirent from parent
|
|
|
|
* @acxt: addrm context to use
|
|
|
|
* @sd: sysfs_dirent to be added
|
|
|
|
*
|
|
|
|
* Mark @sd removed and drop nlink of parent inode if @sd is a
|
|
|
|
* directory. @sd is NOT unlinked from the children list of the
|
|
|
|
* parent. The caller is repsonsible for removing @sd from the
|
|
|
|
* children list before calling this function.
|
|
|
|
*
|
|
|
|
* 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)
|
|
|
|
{
|
|
|
|
BUG_ON(sd->s_sibling || (sd->s_flags & SYSFS_FLAG_REMOVED));
|
|
|
|
|
|
|
|
sd->s_flags |= SYSFS_FLAG_REMOVED;
|
|
|
|
sd->s_sibling = acxt->removed;
|
|
|
|
acxt->removed = sd;
|
|
|
|
|
|
|
|
if (sysfs_type(sd) == SYSFS_DIR && acxt->parent_inode)
|
|
|
|
drop_nlink(acxt->parent_inode);
|
|
|
|
|
|
|
|
acxt->cnt++;
|
|
|
|
}
|
|
|
|
|
2007-06-14 03:27:24 +08:00
|
|
|
/**
|
|
|
|
* sysfs_drop_dentry - drop dentry for the specified sysfs_dirent
|
|
|
|
* @sd: target sysfs_dirent
|
|
|
|
*
|
|
|
|
* Drop dentry for @sd. @sd must have been unlinked from its
|
|
|
|
* parent on entry to this function such that it can't be looked
|
|
|
|
* up anymore.
|
|
|
|
*
|
|
|
|
* @sd->s_dentry which is protected with sysfs_assoc_lock points
|
|
|
|
* to the currently associated dentry but we're not holding a
|
|
|
|
* reference to it and racing with dput(). Grab dcache_lock and
|
|
|
|
* verify dentry before dropping it. If @sd->s_dentry is NULL or
|
|
|
|
* dput() beats us, no need to bother.
|
|
|
|
*/
|
|
|
|
static void sysfs_drop_dentry(struct sysfs_dirent *sd)
|
|
|
|
{
|
|
|
|
struct dentry *dentry = NULL;
|
|
|
|
struct inode *inode;
|
|
|
|
|
|
|
|
/* We're not holding a reference to ->s_dentry dentry but the
|
|
|
|
* field will stay valid as long as sysfs_assoc_lock is held.
|
|
|
|
*/
|
|
|
|
spin_lock(&sysfs_assoc_lock);
|
|
|
|
spin_lock(&dcache_lock);
|
|
|
|
|
|
|
|
/* drop dentry if it's there and dput() didn't kill it yet */
|
|
|
|
if (sd->s_dentry && sd->s_dentry->d_inode) {
|
|
|
|
dentry = dget_locked(sd->s_dentry);
|
|
|
|
spin_lock(&dentry->d_lock);
|
|
|
|
__d_drop(dentry);
|
|
|
|
spin_unlock(&dentry->d_lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
spin_unlock(&dcache_lock);
|
|
|
|
spin_unlock(&sysfs_assoc_lock);
|
|
|
|
|
2007-06-14 03:27:25 +08:00
|
|
|
/* dentries for shadowed inodes are pinned, unpin */
|
|
|
|
if (dentry && sysfs_is_shadowed_inode(dentry->d_inode))
|
2007-06-14 03:27:24 +08:00
|
|
|
dput(dentry);
|
2007-06-14 03:27:25 +08:00
|
|
|
dput(dentry);
|
2007-06-14 03:27:24 +08:00
|
|
|
|
|
|
|
/* adjust nlink and update timestamp */
|
|
|
|
inode = ilookup(sysfs_sb, sd->s_ino);
|
|
|
|
if (inode) {
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
|
|
|
|
|
|
inode->i_ctime = CURRENT_TIME;
|
|
|
|
drop_nlink(inode);
|
|
|
|
if (sysfs_type(sd) == SYSFS_DIR)
|
|
|
|
drop_nlink(inode);
|
|
|
|
|
|
|
|
mutex_unlock(&inode->i_mutex);
|
|
|
|
iput(inode);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2007-06-14 03:27:24 +08:00
|
|
|
/**
|
|
|
|
* 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
|
|
|
|
* cleaned up. Timestamps on the parent inode are updated.
|
|
|
|
*
|
|
|
|
* LOCKING:
|
|
|
|
* All mutexes acquired by sysfs_addrm_start() are released.
|
|
|
|
*
|
|
|
|
* RETURNS:
|
|
|
|
* Number of added/removed sysfs_dirents since sysfs_addrm_start().
|
|
|
|
*/
|
|
|
|
int sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt)
|
|
|
|
{
|
|
|
|
/* release resources acquired by sysfs_addrm_start() */
|
|
|
|
mutex_unlock(&sysfs_mutex);
|
|
|
|
if (acxt->parent_inode) {
|
|
|
|
struct inode *inode = acxt->parent_inode;
|
|
|
|
|
|
|
|
/* if added/removed, update timestamps on the parent */
|
|
|
|
if (acxt->cnt)
|
|
|
|
inode->i_ctime = inode->i_mtime = CURRENT_TIME;
|
|
|
|
|
|
|
|
mutex_unlock(&inode->i_mutex);
|
|
|
|
iput(inode);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* kill removed sysfs_dirents */
|
|
|
|
while (acxt->removed) {
|
|
|
|
struct sysfs_dirent *sd = acxt->removed;
|
|
|
|
|
|
|
|
acxt->removed = sd->s_sibling;
|
|
|
|
sd->s_sibling = NULL;
|
|
|
|
|
|
|
|
sysfs_drop_dentry(sd);
|
|
|
|
sysfs_deactivate(sd);
|
|
|
|
sysfs_put(sd);
|
2007-06-14 02:45:14 +08:00
|
|
|
}
|
2007-06-14 03:27:24 +08:00
|
|
|
|
|
|
|
return acxt->cnt;
|
2007-01-25 03:35:52 +08:00
|
|
|
}
|
|
|
|
|
2007-06-14 03:27:22 +08:00
|
|
|
/**
|
|
|
|
* 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 22:10:14 +08:00
|
|
|
*
|
2007-06-14 03:27:22 +08:00
|
|
|
* LOCKING:
|
2007-06-14 03:27:23 +08:00
|
|
|
* mutex_lock(sysfs_mutex)
|
2006-03-09 22:10:14 +08:00
|
|
|
*
|
2007-06-14 03:27:22 +08:00
|
|
|
* RETURNS:
|
|
|
|
* Pointer to sysfs_dirent if found, NULL if not.
|
2006-03-09 22:10:14 +08:00
|
|
|
*/
|
2007-06-14 03:27:22 +08:00
|
|
|
struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,
|
|
|
|
const unsigned char *name)
|
2006-03-09 22:10:14 +08:00
|
|
|
{
|
2007-06-14 03:27:22 +08:00
|
|
|
struct sysfs_dirent *sd;
|
|
|
|
|
|
|
|
for (sd = parent_sd->s_children; sd; sd = sd->s_sibling)
|
|
|
|
if (sysfs_type(sd) && !strcmp(sd->s_name, name))
|
|
|
|
return sd;
|
|
|
|
return NULL;
|
|
|
|
}
|
2006-03-09 22:10:14 +08:00
|
|
|
|
2007-06-14 03:27:22 +08:00
|
|
|
/**
|
|
|
|
* 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:
|
2007-06-14 03:27:23 +08:00
|
|
|
* Kernel thread context (may sleep). Grabs sysfs_mutex.
|
2007-06-14 03:27:22 +08:00
|
|
|
*
|
|
|
|
* 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;
|
|
|
|
|
2007-06-14 03:27:23 +08:00
|
|
|
mutex_lock(&sysfs_mutex);
|
2007-06-14 03:27:22 +08:00
|
|
|
sd = sysfs_find_dirent(parent_sd, name);
|
|
|
|
sysfs_get(sd);
|
2007-06-14 03:27:23 +08:00
|
|
|
mutex_unlock(&sysfs_mutex);
|
2007-06-14 03:27:22 +08:00
|
|
|
|
|
|
|
return sd;
|
2006-03-09 22:10:14 +08:00
|
|
|
}
|
|
|
|
|
2007-06-14 03:27:22 +08:00
|
|
|
static int create_dir(struct kobject *kobj, struct sysfs_dirent *parent_sd,
|
|
|
|
const char *name, struct sysfs_dirent **p_sd)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO;
|
2007-06-14 03:27:25 +08:00
|
|
|
struct sysfs_addrm_cxt acxt;
|
2007-06-14 02:45:14 +08:00
|
|
|
struct sysfs_dirent *sd;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-06-14 02:45:17 +08:00
|
|
|
/* allocate */
|
2007-06-14 02:45:15 +08:00
|
|
|
sd = sysfs_new_dirent(name, mode, SYSFS_DIR);
|
2007-06-14 02:45:14 +08:00
|
|
|
if (!sd)
|
2007-06-14 03:27:25 +08:00
|
|
|
return -ENOMEM;
|
2007-06-14 02:45:15 +08:00
|
|
|
sd->s_elem.dir.kobj = kobj;
|
2007-06-14 02:45:14 +08:00
|
|
|
|
2007-06-14 02:45:17 +08:00
|
|
|
/* link in */
|
2007-06-14 03:27:25 +08:00
|
|
|
sysfs_addrm_start(&acxt, parent_sd);
|
|
|
|
if (!sysfs_find_dirent(parent_sd, name)) {
|
|
|
|
sysfs_add_one(&acxt, sd);
|
|
|
|
sysfs_link_sibling(sd);
|
|
|
|
}
|
|
|
|
if (sysfs_addrm_finish(&acxt)) {
|
|
|
|
*p_sd = sd;
|
|
|
|
return 0;
|
|
|
|
}
|
2007-06-14 02:45:14 +08:00
|
|
|
|
|
|
|
sysfs_put(sd);
|
2007-06-14 03:27:25 +08:00
|
|
|
return -EEXIST;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2007-06-14 03:27:22 +08:00
|
|
|
int sysfs_create_subdir(struct kobject *kobj, const char *name,
|
|
|
|
struct sysfs_dirent **p_sd)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2007-06-14 03:27:22 +08:00
|
|
|
return create_dir(kobj, kobj->sd, name, p_sd);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* sysfs_create_dir - create a directory for an object.
|
|
|
|
* @kobj: object we're creating directory for.
|
2007-06-14 03:27:22 +08:00
|
|
|
* @shadow_parent: parent object.
|
2005-04-17 06:20:36 +08:00
|
|
|
*/
|
2007-06-14 03:27:22 +08:00
|
|
|
int sysfs_create_dir(struct kobject *kobj,
|
|
|
|
struct sysfs_dirent *shadow_parent_sd)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2007-06-14 03:27:22 +08:00
|
|
|
struct sysfs_dirent *parent_sd, *sd;
|
2005-04-17 06:20:36 +08:00
|
|
|
int error = 0;
|
|
|
|
|
|
|
|
BUG_ON(!kobj);
|
|
|
|
|
2007-06-14 03:27:22 +08:00
|
|
|
if (shadow_parent_sd)
|
|
|
|
parent_sd = shadow_parent_sd;
|
2007-01-25 03:35:52 +08:00
|
|
|
else if (kobj->parent)
|
2007-06-14 03:27:22 +08:00
|
|
|
parent_sd = kobj->parent->sd;
|
2005-04-17 06:20:36 +08:00
|
|
|
else if (sysfs_mount && sysfs_mount->mnt_sb)
|
2007-06-14 03:27:22 +08:00
|
|
|
parent_sd = sysfs_mount->mnt_sb->s_root->d_fsdata;
|
2005-04-17 06:20:36 +08:00
|
|
|
else
|
|
|
|
return -EFAULT;
|
|
|
|
|
2007-06-14 03:27:22 +08:00
|
|
|
error = create_dir(kobj, parent_sd, kobject_name(kobj), &sd);
|
2005-04-17 06:20:36 +08:00
|
|
|
if (!error)
|
2007-06-14 03:27:22 +08:00
|
|
|
kobj->sd = sd;
|
2005-04-17 06:20:36 +08:00
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
2007-06-14 03:27:25 +08:00
|
|
|
static int sysfs_count_nlink(struct sysfs_dirent *sd)
|
|
|
|
{
|
|
|
|
struct sysfs_dirent *child;
|
|
|
|
int nr = 0;
|
|
|
|
|
|
|
|
for (child = sd->s_children; child; child = child->s_sibling)
|
|
|
|
if (sysfs_type(child) == SYSFS_DIR)
|
|
|
|
nr++;
|
|
|
|
return nr + 2;
|
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry,
|
|
|
|
struct nameidata *nd)
|
|
|
|
{
|
|
|
|
struct sysfs_dirent * parent_sd = dentry->d_parent->d_fsdata;
|
|
|
|
struct sysfs_dirent * sd;
|
2007-06-14 03:27:21 +08:00
|
|
|
struct bin_attribute *bin_attr;
|
2007-06-14 02:45:17 +08:00
|
|
|
struct inode *inode;
|
|
|
|
int found = 0;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-06-14 02:45:18 +08:00
|
|
|
for (sd = parent_sd->s_children; sd; sd = sd->s_sibling) {
|
2007-06-14 03:27:25 +08:00
|
|
|
if (sysfs_type(sd) &&
|
2007-06-14 02:45:17 +08:00
|
|
|
!strcmp(sd->s_name, dentry->d_name.name)) {
|
|
|
|
found = 1;
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2007-06-14 02:45:17 +08:00
|
|
|
/* no such entry */
|
|
|
|
if (!found)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
/* attach dentry and inode */
|
2007-06-14 02:45:17 +08:00
|
|
|
inode = sysfs_get_inode(sd);
|
2007-06-14 02:45:17 +08:00
|
|
|
if (!inode)
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
|
2007-06-14 03:27:23 +08:00
|
|
|
mutex_lock(&sysfs_mutex);
|
|
|
|
|
2007-06-14 02:45:17 +08:00
|
|
|
if (inode->i_state & I_NEW) {
|
|
|
|
/* initialize inode according to type */
|
2007-06-14 03:27:21 +08:00
|
|
|
switch (sysfs_type(sd)) {
|
2007-06-14 03:27:25 +08:00
|
|
|
case SYSFS_DIR:
|
|
|
|
inode->i_op = &sysfs_dir_inode_operations;
|
|
|
|
inode->i_fop = &sysfs_dir_operations;
|
|
|
|
inode->i_nlink = sysfs_count_nlink(sd);
|
|
|
|
break;
|
2007-06-14 03:27:21 +08:00
|
|
|
case SYSFS_KOBJ_ATTR:
|
2007-06-14 02:45:17 +08:00
|
|
|
inode->i_size = PAGE_SIZE;
|
|
|
|
inode->i_fop = &sysfs_file_operations;
|
2007-06-14 03:27:21 +08:00
|
|
|
break;
|
|
|
|
case SYSFS_KOBJ_BIN_ATTR:
|
|
|
|
bin_attr = sd->s_elem.bin_attr.bin_attr;
|
2007-06-14 02:45:17 +08:00
|
|
|
inode->i_size = bin_attr->size;
|
|
|
|
inode->i_fop = &bin_fops;
|
2007-06-14 03:27:21 +08:00
|
|
|
break;
|
|
|
|
case SYSFS_KOBJ_LINK:
|
2007-06-14 02:45:17 +08:00
|
|
|
inode->i_op = &sysfs_symlink_inode_operations;
|
2007-06-14 03:27:21 +08:00
|
|
|
break;
|
|
|
|
default:
|
|
|
|
BUG();
|
|
|
|
}
|
2007-06-14 02:45:17 +08:00
|
|
|
}
|
2007-06-14 02:45:17 +08:00
|
|
|
|
|
|
|
sysfs_instantiate(dentry, inode);
|
|
|
|
sysfs_attach_dentry(sd, dentry);
|
|
|
|
|
2007-06-14 03:27:23 +08:00
|
|
|
mutex_unlock(&sysfs_mutex);
|
|
|
|
|
2007-06-14 02:45:17 +08:00
|
|
|
return NULL;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2007-02-12 16:55:40 +08:00
|
|
|
const struct inode_operations sysfs_dir_inode_operations = {
|
2005-04-17 06:20:36 +08:00
|
|
|
.lookup = sysfs_lookup,
|
2005-05-31 13:09:14 +08:00
|
|
|
.setattr = sysfs_setattr,
|
2005-04-17 06:20:36 +08:00
|
|
|
};
|
|
|
|
|
2007-06-14 03:27:22 +08:00
|
|
|
static void remove_dir(struct sysfs_dirent *sd)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2007-06-14 03:27:24 +08:00
|
|
|
struct sysfs_addrm_cxt acxt;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-06-14 03:27:24 +08:00
|
|
|
sysfs_addrm_start(&acxt, sd->s_parent);
|
|
|
|
sysfs_unlink_sibling(sd);
|
|
|
|
sysfs_remove_one(&acxt, sd);
|
|
|
|
sysfs_addrm_finish(&acxt);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2007-06-14 03:27:22 +08:00
|
|
|
void sysfs_remove_subdir(struct sysfs_dirent *sd)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2007-06-14 03:27:22 +08:00
|
|
|
remove_dir(sd);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2007-06-14 03:27:22 +08:00
|
|
|
static void __sysfs_remove_dir(struct sysfs_dirent *dir_sd)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2007-06-14 03:27:24 +08:00
|
|
|
struct sysfs_addrm_cxt acxt;
|
2007-06-14 02:45:18 +08:00
|
|
|
struct sysfs_dirent **pos;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-06-14 03:27:22 +08:00
|
|
|
if (!dir_sd)
|
2005-04-17 06:20:36 +08:00
|
|
|
return;
|
|
|
|
|
2007-06-14 03:27:22 +08:00
|
|
|
pr_debug("sysfs %s: removing dir\n", dir_sd->s_name);
|
2007-06-14 03:27:24 +08:00
|
|
|
sysfs_addrm_start(&acxt, dir_sd);
|
2007-06-14 03:27:22 +08:00
|
|
|
pos = &dir_sd->s_children;
|
2007-06-14 02:45:18 +08:00
|
|
|
while (*pos) {
|
|
|
|
struct sysfs_dirent *sd = *pos;
|
|
|
|
|
2007-06-14 03:27:25 +08:00
|
|
|
if (sysfs_type(sd) && sysfs_type(sd) != SYSFS_DIR) {
|
2007-06-14 02:45:18 +08:00
|
|
|
*pos = sd->s_sibling;
|
2007-06-14 03:27:24 +08:00
|
|
|
sd->s_sibling = NULL;
|
|
|
|
sysfs_remove_one(&acxt, sd);
|
2007-06-14 02:45:18 +08:00
|
|
|
} else
|
|
|
|
pos = &(*pos)->s_sibling;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2007-06-14 03:27:24 +08:00
|
|
|
sysfs_addrm_finish(&acxt);
|
2007-06-14 02:45:16 +08:00
|
|
|
|
2007-06-14 03:27:22 +08:00
|
|
|
remove_dir(dir_sd);
|
2007-01-25 03:35:52 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* 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)
|
|
|
|
{
|
2007-06-14 03:27:22 +08:00
|
|
|
struct sysfs_dirent *sd = kobj->sd;
|
2007-06-14 02:45:15 +08:00
|
|
|
|
2007-06-14 03:27:23 +08:00
|
|
|
spin_lock(&sysfs_assoc_lock);
|
2007-06-14 03:27:22 +08:00
|
|
|
kobj->sd = NULL;
|
2007-06-14 03:27:23 +08:00
|
|
|
spin_unlock(&sysfs_assoc_lock);
|
2007-06-14 02:45:15 +08:00
|
|
|
|
2007-06-14 03:27:22 +08:00
|
|
|
__sysfs_remove_dir(sd);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2007-06-14 03:27:22 +08:00
|
|
|
int sysfs_rename_dir(struct kobject *kobj, struct sysfs_dirent *new_parent_sd,
|
2007-01-25 03:35:52 +08:00
|
|
|
const char *new_name)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2007-06-14 03:27:22 +08:00
|
|
|
struct sysfs_dirent *sd = kobj->sd;
|
2007-06-14 03:27:25 +08:00
|
|
|
struct dentry *new_parent = NULL;
|
|
|
|
struct dentry *old_dentry = NULL, *new_dentry = NULL;
|
|
|
|
const char *dup_name = NULL;
|
2007-06-14 02:45:14 +08:00
|
|
|
int error;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-06-14 03:27:25 +08:00
|
|
|
/* get dentries */
|
|
|
|
old_dentry = sysfs_get_dentry(sd);
|
|
|
|
if (IS_ERR(old_dentry)) {
|
|
|
|
error = PTR_ERR(old_dentry);
|
|
|
|
goto out_dput;
|
|
|
|
}
|
|
|
|
|
|
|
|
new_parent = sysfs_get_dentry(new_parent_sd);
|
|
|
|
if (IS_ERR(new_parent)) {
|
|
|
|
error = PTR_ERR(new_parent);
|
|
|
|
goto out_dput;
|
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-06-14 03:27:25 +08:00
|
|
|
/* lock new_parent and get dentry for new name */
|
2007-01-25 03:35:52 +08:00
|
|
|
mutex_lock(&new_parent->d_inode->i_mutex);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-01-25 03:35:52 +08:00
|
|
|
new_dentry = lookup_one_len(new_name, new_parent, strlen(new_name));
|
2007-06-14 02:45:14 +08:00
|
|
|
if (IS_ERR(new_dentry)) {
|
|
|
|
error = PTR_ERR(new_dentry);
|
|
|
|
goto out_unlock;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2007-06-14 02:45:14 +08:00
|
|
|
|
|
|
|
/* By allowing two different directories with the same
|
|
|
|
* d_parent we allow this routine to move between different
|
|
|
|
* shadows of the same directory
|
|
|
|
*/
|
|
|
|
error = -EINVAL;
|
2007-06-14 03:27:25 +08:00
|
|
|
if (old_dentry->d_parent->d_inode != new_parent->d_inode ||
|
2007-06-14 02:45:14 +08:00
|
|
|
new_dentry->d_parent->d_inode != new_parent->d_inode ||
|
2007-06-14 03:27:25 +08:00
|
|
|
old_dentry == new_dentry)
|
|
|
|
goto out_unlock;
|
2007-06-14 02:45:14 +08:00
|
|
|
|
|
|
|
error = -EEXIST;
|
|
|
|
if (new_dentry->d_inode)
|
2007-06-14 03:27:25 +08:00
|
|
|
goto out_unlock;
|
2007-06-14 02:45:14 +08:00
|
|
|
|
2007-06-14 02:45:15 +08:00
|
|
|
/* rename kobject and sysfs_dirent */
|
|
|
|
error = -ENOMEM;
|
|
|
|
new_name = dup_name = kstrdup(new_name, GFP_KERNEL);
|
|
|
|
if (!new_name)
|
|
|
|
goto out_drop;
|
|
|
|
|
2007-06-14 02:45:14 +08:00
|
|
|
error = kobject_set_name(kobj, "%s", new_name);
|
|
|
|
if (error)
|
2007-06-14 03:27:25 +08:00
|
|
|
goto out_drop;
|
2007-06-14 02:45:14 +08:00
|
|
|
|
2007-06-14 03:27:25 +08:00
|
|
|
dup_name = sd->s_name;
|
2007-06-14 02:45:15 +08:00
|
|
|
sd->s_name = new_name;
|
|
|
|
|
|
|
|
/* move under the new parent */
|
2007-06-14 02:45:14 +08:00
|
|
|
d_add(new_dentry, NULL);
|
2007-06-14 03:27:22 +08:00
|
|
|
d_move(sd->s_dentry, new_dentry);
|
2007-06-14 02:45:14 +08:00
|
|
|
|
2007-06-14 03:27:23 +08:00
|
|
|
mutex_lock(&sysfs_mutex);
|
|
|
|
|
2007-06-14 02:45:18 +08:00
|
|
|
sysfs_unlink_sibling(sd);
|
2007-06-14 03:27:22 +08:00
|
|
|
sysfs_get(new_parent_sd);
|
2007-06-14 02:45:17 +08:00
|
|
|
sysfs_put(sd->s_parent);
|
2007-06-14 03:27:22 +08:00
|
|
|
sd->s_parent = new_parent_sd;
|
2007-06-14 02:45:18 +08:00
|
|
|
sysfs_link_sibling(sd);
|
2007-06-14 02:45:14 +08:00
|
|
|
|
2007-06-14 03:27:23 +08:00
|
|
|
mutex_unlock(&sysfs_mutex);
|
|
|
|
|
2007-06-14 02:45:14 +08:00
|
|
|
error = 0;
|
|
|
|
goto out_unlock;
|
|
|
|
|
|
|
|
out_drop:
|
|
|
|
d_drop(new_dentry);
|
|
|
|
out_unlock:
|
2007-01-25 03:35:52 +08:00
|
|
|
mutex_unlock(&new_parent->d_inode->i_mutex);
|
2007-06-14 03:27:25 +08:00
|
|
|
out_dput:
|
|
|
|
kfree(dup_name);
|
|
|
|
dput(new_parent);
|
|
|
|
dput(old_dentry);
|
|
|
|
dput(new_dentry);
|
2005-04-17 06:20:36 +08:00
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
2007-06-14 03:27:25 +08:00
|
|
|
int sysfs_move_dir(struct kobject *kobj, struct kobject *new_parent_kobj)
|
2006-11-21 00:07:51 +08:00
|
|
|
{
|
2007-06-14 03:27:25 +08:00
|
|
|
struct sysfs_dirent *sd = kobj->sd;
|
|
|
|
struct sysfs_dirent *new_parent_sd;
|
|
|
|
struct dentry *old_parent, *new_parent = NULL;
|
|
|
|
struct dentry *old_dentry = NULL, *new_dentry = NULL;
|
2006-11-21 00:07:51 +08:00
|
|
|
int error;
|
|
|
|
|
2007-06-14 03:27:25 +08:00
|
|
|
BUG_ON(!sd->s_parent);
|
|
|
|
new_parent_sd = new_parent_kobj->sd ? new_parent_kobj->sd : &sysfs_root;
|
|
|
|
|
|
|
|
/* get dentries */
|
|
|
|
old_dentry = sysfs_get_dentry(sd);
|
|
|
|
if (IS_ERR(old_dentry)) {
|
|
|
|
error = PTR_ERR(old_dentry);
|
|
|
|
goto out_dput;
|
|
|
|
}
|
|
|
|
old_parent = sd->s_parent->s_dentry;
|
|
|
|
|
|
|
|
new_parent = sysfs_get_dentry(new_parent_sd);
|
|
|
|
if (IS_ERR(new_parent)) {
|
|
|
|
error = PTR_ERR(new_parent);
|
|
|
|
goto out_dput;
|
|
|
|
}
|
2006-11-21 00:07:51 +08:00
|
|
|
|
2007-06-14 03:27:25 +08:00
|
|
|
if (old_parent->d_inode == new_parent->d_inode) {
|
|
|
|
error = 0;
|
|
|
|
goto out_dput; /* nothing to move */
|
|
|
|
}
|
2006-11-21 00:07:51 +08:00
|
|
|
again:
|
2007-06-14 03:27:25 +08:00
|
|
|
mutex_lock(&old_parent->d_inode->i_mutex);
|
|
|
|
if (!mutex_trylock(&new_parent->d_inode->i_mutex)) {
|
|
|
|
mutex_unlock(&old_parent->d_inode->i_mutex);
|
2006-11-21 00:07:51 +08:00
|
|
|
goto again;
|
|
|
|
}
|
|
|
|
|
2007-06-14 03:27:25 +08:00
|
|
|
new_dentry = lookup_one_len(kobj->name, new_parent, strlen(kobj->name));
|
2006-11-21 00:07:51 +08:00
|
|
|
if (IS_ERR(new_dentry)) {
|
|
|
|
error = PTR_ERR(new_dentry);
|
2007-06-14 03:27:25 +08:00
|
|
|
goto out_unlock;
|
2006-11-21 00:07:51 +08:00
|
|
|
} else
|
|
|
|
error = 0;
|
|
|
|
d_add(new_dentry, NULL);
|
2007-06-14 03:27:22 +08:00
|
|
|
d_move(sd->s_dentry, new_dentry);
|
2006-11-21 00:07:51 +08:00
|
|
|
dput(new_dentry);
|
|
|
|
|
|
|
|
/* Remove from old parent's list and insert into new parent's list. */
|
2007-06-14 03:27:23 +08:00
|
|
|
mutex_lock(&sysfs_mutex);
|
|
|
|
|
2007-06-14 02:45:18 +08:00
|
|
|
sysfs_unlink_sibling(sd);
|
2007-06-14 02:45:17 +08:00
|
|
|
sysfs_get(new_parent_sd);
|
|
|
|
sysfs_put(sd->s_parent);
|
|
|
|
sd->s_parent = new_parent_sd;
|
2007-06-14 02:45:18 +08:00
|
|
|
sysfs_link_sibling(sd);
|
2006-11-21 00:07:51 +08:00
|
|
|
|
2007-06-14 03:27:23 +08:00
|
|
|
mutex_unlock(&sysfs_mutex);
|
2006-11-21 00:07:51 +08:00
|
|
|
|
2007-06-14 03:27:25 +08:00
|
|
|
out_unlock:
|
|
|
|
mutex_unlock(&new_parent->d_inode->i_mutex);
|
|
|
|
mutex_unlock(&old_parent->d_inode->i_mutex);
|
|
|
|
out_dput:
|
|
|
|
dput(new_parent);
|
|
|
|
dput(old_dentry);
|
|
|
|
dput(new_dentry);
|
2006-11-21 00:07:51 +08:00
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
static int sysfs_dir_open(struct inode *inode, struct file *file)
|
|
|
|
{
|
2006-12-08 18:36:36 +08:00
|
|
|
struct dentry * dentry = file->f_path.dentry;
|
2005-04-17 06:20:36 +08:00
|
|
|
struct sysfs_dirent * parent_sd = dentry->d_fsdata;
|
2007-06-14 02:45:14 +08:00
|
|
|
struct sysfs_dirent * sd;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-06-14 02:45:15 +08:00
|
|
|
sd = sysfs_new_dirent("_DIR_", 0, 0);
|
2007-06-14 03:27:23 +08:00
|
|
|
if (sd) {
|
|
|
|
mutex_lock(&sysfs_mutex);
|
2007-06-14 03:27:24 +08:00
|
|
|
sd->s_parent = sysfs_get(parent_sd);
|
|
|
|
sysfs_link_sibling(sd);
|
2007-06-14 03:27:23 +08:00
|
|
|
mutex_unlock(&sysfs_mutex);
|
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-06-14 02:45:14 +08:00
|
|
|
file->private_data = sd;
|
|
|
|
return sd ? 0 : -ENOMEM;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static int sysfs_dir_close(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
struct sysfs_dirent * cursor = file->private_data;
|
|
|
|
|
2007-06-14 03:27:23 +08:00
|
|
|
mutex_lock(&sysfs_mutex);
|
2007-06-14 02:45:18 +08:00
|
|
|
sysfs_unlink_sibling(cursor);
|
2007-06-14 03:27:23 +08:00
|
|
|
mutex_unlock(&sysfs_mutex);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
release_sysfs_dirent(cursor);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* 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 18:36:36 +08:00
|
|
|
struct dentry *dentry = filp->f_path.dentry;
|
2005-04-17 06:20:36 +08:00
|
|
|
struct sysfs_dirent * parent_sd = dentry->d_fsdata;
|
|
|
|
struct sysfs_dirent *cursor = filp->private_data;
|
2007-06-14 02:45:18 +08:00
|
|
|
struct sysfs_dirent **pos;
|
2005-04-17 06:20:36 +08:00
|
|
|
ino_t ino;
|
|
|
|
int i = filp->f_pos;
|
|
|
|
|
|
|
|
switch (i) {
|
|
|
|
case 0:
|
2007-06-11 13:02:45 +08:00
|
|
|
ino = parent_sd->s_ino;
|
2005-04-17 06:20:36 +08:00
|
|
|
if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
|
|
|
|
break;
|
|
|
|
filp->f_pos++;
|
|
|
|
i++;
|
|
|
|
/* fallthrough */
|
|
|
|
case 1:
|
2007-06-14 02:45:14 +08:00
|
|
|
if (parent_sd->s_parent)
|
|
|
|
ino = parent_sd->s_parent->s_ino;
|
|
|
|
else
|
|
|
|
ino = parent_sd->s_ino;
|
2005-04-17 06:20:36 +08:00
|
|
|
if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
|
|
|
|
break;
|
|
|
|
filp->f_pos++;
|
|
|
|
i++;
|
|
|
|
/* fallthrough */
|
|
|
|
default:
|
2007-06-14 03:27:23 +08:00
|
|
|
mutex_lock(&sysfs_mutex);
|
|
|
|
|
2007-06-14 02:45:18 +08:00
|
|
|
pos = &parent_sd->s_children;
|
|
|
|
while (*pos != cursor)
|
|
|
|
pos = &(*pos)->s_sibling;
|
|
|
|
|
|
|
|
/* unlink cursor */
|
|
|
|
*pos = cursor->s_sibling;
|
|
|
|
|
2006-06-26 15:24:40 +08:00
|
|
|
if (filp->f_pos == 2)
|
2007-06-14 02:45:18 +08:00
|
|
|
pos = &parent_sd->s_children;
|
2006-06-26 15:24:40 +08:00
|
|
|
|
2007-06-14 02:45:18 +08:00
|
|
|
for ( ; *pos; pos = &(*pos)->s_sibling) {
|
|
|
|
struct sysfs_dirent *next = *pos;
|
2005-04-17 06:20:36 +08:00
|
|
|
const char * name;
|
|
|
|
int len;
|
|
|
|
|
2007-06-14 03:27:21 +08:00
|
|
|
if (!sysfs_type(next))
|
2005-04-17 06:20:36 +08:00
|
|
|
continue;
|
|
|
|
|
2007-06-14 02:45:15 +08:00
|
|
|
name = next->s_name;
|
2005-04-17 06:20:36 +08:00
|
|
|
len = strlen(name);
|
2007-06-11 13:02:45 +08:00
|
|
|
ino = next->s_ino;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
if (filldir(dirent, name, len, filp->f_pos, ino,
|
|
|
|
dt_type(next)) < 0)
|
2007-06-14 02:45:18 +08:00
|
|
|
break;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
filp->f_pos++;
|
|
|
|
}
|
2007-06-14 02:45:18 +08:00
|
|
|
|
|
|
|
/* put cursor back in */
|
|
|
|
cursor->s_sibling = *pos;
|
|
|
|
*pos = cursor;
|
2007-06-14 03:27:23 +08:00
|
|
|
|
|
|
|
mutex_unlock(&sysfs_mutex);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static loff_t sysfs_dir_lseek(struct file * file, loff_t offset, int origin)
|
|
|
|
{
|
2006-12-08 18:36:36 +08:00
|
|
|
struct dentry * dentry = file->f_path.dentry;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
switch (origin) {
|
|
|
|
case 1:
|
|
|
|
offset += file->f_pos;
|
|
|
|
case 0:
|
|
|
|
if (offset >= 0)
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
if (offset != file->f_pos) {
|
2007-06-14 03:27:23 +08:00
|
|
|
mutex_lock(&sysfs_mutex);
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
file->f_pos = offset;
|
|
|
|
if (file->f_pos >= 2) {
|
|
|
|
struct sysfs_dirent *sd = dentry->d_fsdata;
|
|
|
|
struct sysfs_dirent *cursor = file->private_data;
|
2007-06-14 02:45:18 +08:00
|
|
|
struct sysfs_dirent **pos;
|
2005-04-17 06:20:36 +08:00
|
|
|
loff_t n = file->f_pos - 2;
|
|
|
|
|
2007-06-14 02:45:18 +08:00
|
|
|
sysfs_unlink_sibling(cursor);
|
|
|
|
|
|
|
|
pos = &sd->s_children;
|
|
|
|
while (n && *pos) {
|
|
|
|
struct sysfs_dirent *next = *pos;
|
2007-06-14 03:27:21 +08:00
|
|
|
if (sysfs_type(next))
|
2005-04-17 06:20:36 +08:00
|
|
|
n--;
|
2007-06-14 02:45:18 +08:00
|
|
|
pos = &(*pos)->s_sibling;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2007-06-14 02:45:18 +08:00
|
|
|
|
|
|
|
cursor->s_sibling = *pos;
|
|
|
|
*pos = cursor;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2007-06-14 03:27:23 +08:00
|
|
|
|
|
|
|
mutex_unlock(&sysfs_mutex);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2007-06-14 03:27:23 +08:00
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
return offset;
|
|
|
|
}
|
|
|
|
|
2007-01-25 03:35:52 +08:00
|
|
|
|
|
|
|
/**
|
|
|
|
* sysfs_make_shadowed_dir - Setup so a directory can be shadowed
|
|
|
|
* @kobj: object we're creating shadow of.
|
|
|
|
*/
|
|
|
|
|
|
|
|
int sysfs_make_shadowed_dir(struct kobject *kobj,
|
|
|
|
void * (*follow_link)(struct dentry *, struct nameidata *))
|
|
|
|
{
|
2007-06-14 03:27:25 +08:00
|
|
|
struct dentry *dentry;
|
2007-01-25 03:35:52 +08:00
|
|
|
struct inode *inode;
|
|
|
|
struct inode_operations *i_op;
|
|
|
|
|
2007-06-14 03:27:25 +08:00
|
|
|
/* get dentry for @kobj->sd, dentry of a shadowed dir is pinned */
|
|
|
|
dentry = sysfs_get_dentry(kobj->sd);
|
|
|
|
if (IS_ERR(dentry))
|
|
|
|
return PTR_ERR(dentry);
|
|
|
|
|
|
|
|
inode = dentry->d_inode;
|
|
|
|
if (inode->i_op != &sysfs_dir_inode_operations) {
|
|
|
|
dput(dentry);
|
2007-01-25 03:35:52 +08:00
|
|
|
return -EINVAL;
|
2007-06-14 03:27:25 +08:00
|
|
|
}
|
2007-01-25 03:35:52 +08:00
|
|
|
|
|
|
|
i_op = kmalloc(sizeof(*i_op), GFP_KERNEL);
|
|
|
|
if (!i_op)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
memcpy(i_op, &sysfs_dir_inode_operations, sizeof(*i_op));
|
|
|
|
i_op->follow_link = follow_link;
|
|
|
|
|
|
|
|
/* Locking of inode->i_op?
|
|
|
|
* Since setting i_op is a single word write and they
|
|
|
|
* are atomic we should be ok here.
|
|
|
|
*/
|
|
|
|
inode->i_op = i_op;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* sysfs_create_shadow_dir - create a shadow directory for an object.
|
|
|
|
* @kobj: object we're creating directory for.
|
|
|
|
*
|
|
|
|
* sysfs_make_shadowed_dir must already have been called on this
|
|
|
|
* directory.
|
|
|
|
*/
|
|
|
|
|
2007-06-14 03:27:22 +08:00
|
|
|
struct sysfs_dirent *sysfs_create_shadow_dir(struct kobject *kobj)
|
2007-01-25 03:35:52 +08:00
|
|
|
{
|
2007-06-14 03:27:25 +08:00
|
|
|
struct sysfs_dirent *parent_sd = kobj->sd->s_parent;
|
|
|
|
struct dentry *dir, *parent, *shadow;
|
|
|
|
struct inode *inode;
|
2007-01-25 03:35:52 +08:00
|
|
|
struct sysfs_dirent *sd;
|
2007-06-14 03:27:24 +08:00
|
|
|
struct sysfs_addrm_cxt acxt;
|
2007-01-25 03:35:52 +08:00
|
|
|
|
2007-06-14 03:27:25 +08:00
|
|
|
dir = sysfs_get_dentry(kobj->sd);
|
|
|
|
if (IS_ERR(dir)) {
|
|
|
|
sd = (void *)dir;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
parent = dir->d_parent;
|
|
|
|
|
|
|
|
inode = dir->d_inode;
|
2007-06-14 03:27:22 +08:00
|
|
|
sd = ERR_PTR(-EINVAL);
|
2007-01-25 03:35:52 +08:00
|
|
|
if (!sysfs_is_shadowed_inode(inode))
|
2007-06-14 03:27:25 +08:00
|
|
|
goto out_dput;
|
2007-01-25 03:35:52 +08:00
|
|
|
|
|
|
|
shadow = d_alloc(parent, &dir->d_name);
|
|
|
|
if (!shadow)
|
|
|
|
goto nomem;
|
|
|
|
|
2007-06-14 02:45:15 +08:00
|
|
|
sd = sysfs_new_dirent("_SHADOW_", inode->i_mode, SYSFS_DIR);
|
2007-01-25 03:35:52 +08:00
|
|
|
if (!sd)
|
|
|
|
goto nomem;
|
2007-06-14 02:45:15 +08:00
|
|
|
sd->s_elem.dir.kobj = kobj;
|
2007-01-25 03:35:52 +08:00
|
|
|
|
2007-06-14 03:27:24 +08:00
|
|
|
sysfs_addrm_start(&acxt, parent_sd);
|
|
|
|
|
|
|
|
/* add but don't link into children list */
|
|
|
|
sysfs_add_one(&acxt, sd);
|
|
|
|
|
|
|
|
/* attach and instantiate dentry */
|
|
|
|
sysfs_attach_dentry(sd, shadow);
|
2007-01-25 03:35:52 +08:00
|
|
|
d_instantiate(shadow, igrab(inode));
|
2007-06-14 03:27:24 +08:00
|
|
|
inc_nlink(inode); /* tj: synchronization? */
|
|
|
|
|
|
|
|
sysfs_addrm_finish(&acxt);
|
2007-01-25 03:35:52 +08:00
|
|
|
|
|
|
|
dget(shadow); /* Extra count - pin the dentry in core */
|
|
|
|
|
2007-06-14 03:27:25 +08:00
|
|
|
goto out_dput;
|
|
|
|
|
|
|
|
nomem:
|
2007-01-25 03:35:52 +08:00
|
|
|
dput(shadow);
|
2007-06-14 03:27:22 +08:00
|
|
|
sd = ERR_PTR(-ENOMEM);
|
2007-06-14 03:27:25 +08:00
|
|
|
out_dput:
|
|
|
|
dput(dir);
|
|
|
|
out:
|
|
|
|
return sd;
|
2007-01-25 03:35:52 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* sysfs_remove_shadow_dir - remove an object's directory.
|
2007-06-14 03:27:22 +08:00
|
|
|
* @shadow_sd: sysfs_dirent of shadow directory
|
2007-01-25 03:35:52 +08:00
|
|
|
*
|
|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
|
2007-06-14 03:27:22 +08:00
|
|
|
void sysfs_remove_shadow_dir(struct sysfs_dirent *shadow_sd)
|
2007-01-25 03:35:52 +08:00
|
|
|
{
|
2007-06-14 03:27:22 +08:00
|
|
|
__sysfs_remove_dir(shadow_sd);
|
2007-01-25 03:35:52 +08:00
|
|
|
}
|
|
|
|
|
2006-03-28 17:56:42 +08:00
|
|
|
const struct file_operations sysfs_dir_operations = {
|
2005-04-17 06:20:36 +08:00
|
|
|
.open = sysfs_dir_open,
|
|
|
|
.release = sysfs_dir_close,
|
|
|
|
.llseek = sysfs_dir_lseek,
|
|
|
|
.read = generic_read_dir,
|
|
|
|
.readdir = sysfs_readdir,
|
|
|
|
};
|