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file.c
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/* * fs/sysfs/file.c - sysfs regular (text) file implementation * * Copyright (c) 2001-3 Patrick Mochel * Copyright (c) 2007 SUSE Linux Products GmbH * Copyright (c) 2007 Tejun Heo <teheo@suse.de> * * This file is released under the GPLv2. * * Please see Documentation/filesystems/sysfs.txt for more information. */ #include <linux/module.h> #include <linux/kobject.h> #include <linux/kallsyms.h> #include <linux/slab.h> #include <linux/fsnotify.h> #include <linux/namei.h> #include <linux/poll.h> #include <linux/list.h> #include <linux/mutex.h> #include <linux/limits.h> #include <linux/uaccess.h> #include "sysfs.h" /* * There's one sysfs_buffer for each open file and one sysfs_open_dirent * for each sysfs_dirent with one or more open files. * * sysfs_dirent->s_attr.open points to sysfs_open_dirent. s_attr.open is * protected by sysfs_open_dirent_lock. * * filp->private_data points to sysfs_buffer which is chained at * sysfs_open_dirent->buffers, which is protected by sysfs_open_file_mutex. */ static DEFINE_SPINLOCK(sysfs_open_dirent_lock); static DEFINE_MUTEX(sysfs_open_file_mutex); struct sysfs_open_dirent { atomic_t refcnt; atomic_t event; wait_queue_head_t poll; struct list_head buffers; /* goes through sysfs_buffer.list */ }; struct sysfs_buffer { size_t count; char *page; struct mutex mutex; int event; struct list_head list; }; /* * Determine ktype->sysfs_ops for the given sysfs_dirent. This function * must be called while holding an active reference. */ static const struct sysfs_ops *sysfs_file_ops(struct sysfs_dirent *sd) { struct kobject *kobj = sd->s_parent->s_dir.kobj; lockdep_assert_held(sd); return kobj->ktype ? kobj->ktype->sysfs_ops : NULL; } /** * fill_read_buffer - allocate and fill buffer from object. * @dentry: dentry pointer. * @buffer: data buffer for file. * * Allocate @buffer->page, if it hasn't been already, then call the * kobject's show() method to fill the buffer with this attribute's * data. * This is called only once, on the file's first read unless an error * is returned. */ static int fill_read_buffer(struct dentry *dentry, struct sysfs_buffer *buffer) { struct sysfs_dirent *attr_sd = dentry->d_fsdata; struct kobject *kobj = attr_sd->s_parent->s_dir.kobj; const struct sysfs_ops *ops; int ret = 0; ssize_t count; if (!buffer->page) buffer->page = (char *) get_zeroed_page(GFP_KERNEL); if (!buffer->page) return -ENOMEM; /* need attr_sd for attr and ops, its parent for kobj */ if (!sysfs_get_active(attr_sd)) return -ENODEV; buffer->event = atomic_read(&attr_sd->s_attr.open->event); ops = sysfs_file_ops(attr_sd); count = ops->show(kobj, attr_sd->s_attr.attr, buffer->page); sysfs_put_active(attr_sd); /* * The code works fine with PAGE_SIZE return but it's likely to * indicate truncated result or overflow in normal use cases. */ if (count >= (ssize_t)PAGE_SIZE) { print_symbol("fill_read_buffer: %s returned bad count\n", (unsigned long)ops->show); /* Try to struggle along */ count = PAGE_SIZE - 1; } if (count >= 0) buffer->count = count; else ret = count; return ret; } /** * sysfs_read_file - read an attribute. * @file: file pointer. * @buf: buffer to fill. * @count: number of bytes to read. * @ppos: starting offset in file. * * Userspace wants to read an attribute file. The attribute descriptor * is in the file's ->d_fsdata. The target object is in the directory's * ->d_fsdata. * * We call fill_read_buffer() to allocate and fill the buffer from the * object's show() method exactly once (if the read is happening from * the beginning of the file). That should fill the entire buffer with * all the data the object has to offer for that attribute. * We then call flush_read_buffer() to copy the buffer to userspace * in the increments specified. */ static ssize_t sysfs_read_file(struct file *file, char __user *buf, size_t count, loff_t *ppos) { struct sysfs_buffer *buffer = file->private_data; ssize_t retval = 0; mutex_lock(&buffer->mutex); /* * Fill on zero offset and the first read so that silly things like * "dd bs=1 skip=N" can work on sysfs files. */ if (*ppos == 0 || !buffer->page) { retval = fill_read_buffer(file->f_path.dentry, buffer); if (retval) goto out; } pr_debug("%s: count = %zd, ppos = %lld, buf = %s\n", __func__, count, *ppos, buffer->page); retval = simple_read_from_buffer(buf, count, ppos, buffer->page, buffer->count); out: mutex_unlock(&buffer->mutex); return retval; } /** * fill_write_buffer - copy buffer from userspace. * @buffer: data buffer for file. * @buf: data from user. * @count: number of bytes in @userbuf. * * Allocate @buffer->page if it hasn't been already, then * copy the user-supplied buffer into it. */ static int fill_write_buffer(struct sysfs_buffer *buffer, const char __user *buf, size_t count) { int error; if (!buffer->page) buffer->page = (char *)get_zeroed_page(GFP_KERNEL); if (!buffer->page) return -ENOMEM; if (count >= PAGE_SIZE) count = PAGE_SIZE - 1; error = copy_from_user(buffer->page, buf, count); /* * If buf is assumed to contain a string, terminate it by \0, so * e.g. sscanf() can scan the string easily. */ buffer->page[count] = 0; return error ? -EFAULT : count; } /** * flush_write_buffer - push buffer to kobject. * @dentry: dentry to the attribute * @buffer: data buffer for file. * @count: number of bytes * * Get the correct pointers for the kobject and the attribute we're * dealing with, then call the store() method for the attribute, * passing the buffer that we acquired in fill_write_buffer(). */ static int flush_write_buffer(struct dentry *dentry, struct sysfs_buffer *buffer, size_t count) { struct sysfs_dirent *attr_sd = dentry->d_fsdata; struct kobject *kobj = attr_sd->s_parent->s_dir.kobj; const struct sysfs_ops *ops; int rc; /* need attr_sd for attr and ops, its parent for kobj */ if (!sysfs_get_active(attr_sd)) return -ENODEV; ops = sysfs_file_ops(attr_sd); rc = ops->store(kobj, attr_sd->s_attr.attr, buffer->page, count); sysfs_put_active(attr_sd); return rc; } /** * sysfs_write_file - write an attribute. * @file: file pointer * @buf: data to write * @count: number of bytes * @ppos: starting offset * * Similar to sysfs_read_file(), though working in the opposite direction. * We allocate and fill the data from the user in fill_write_buffer(), * then push it to the kobject in flush_write_buffer(). * There is no easy way for us to know if userspace is only doing a partial * write, so we don't support them. We expect the entire buffer to come * on the first write. * Hint: if you're writing a value, first read the file, modify only the * the value you're changing, then write entire buffer back. */ static ssize_t sysfs_write_file(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { struct sysfs_buffer *buffer = file->private_data; ssize_t len; mutex_lock(&buffer->mutex); len = fill_write_buffer(buffer, buf, count); if (len > 0) len = flush_write_buffer(file->f_path.dentry, buffer, len); if (len > 0) *ppos += len; mutex_unlock(&buffer->mutex); return len; } /** * sysfs_get_open_dirent - get or create sysfs_open_dirent * @sd: target sysfs_dirent * @buffer: sysfs_buffer for this instance of open * * If @sd->s_attr.open exists, increment its reference count; * otherwise, create one. @buffer is chained to the buffers * list. * * LOCKING: * Kernel thread context (may sleep). * * RETURNS: * 0 on success, -errno on failure. */ static int sysfs_get_open_dirent(struct sysfs_dirent *sd, struct sysfs_buffer *buffer) { struct sysfs_open_dirent *od, *new_od = NULL; retry: mutex_lock(&sysfs_open_file_mutex); spin_lock_irq(&sysfs_open_dirent_lock); if (!sd->s_attr.open && new_od) { sd->s_attr.open = new_od; new_od = NULL; } od = sd->s_attr.open; if (od) { atomic_inc(&od->refcnt); list_add_tail(&buffer->list, &od->buffers); } spin_unlock_irq(&sysfs_open_dirent_lock); mutex_unlock(&sysfs_open_file_mutex); if (od) { kfree(new_od); return 0; } /* not there, initialize a new one and retry */ new_od = kmalloc(sizeof(*new_od), GFP_KERNEL); if (!new_od) return -ENOMEM; atomic_set(&new_od->refcnt, 0); atomic_set(&new_od->event, 1); init_waitqueue_head(&new_od->poll); INIT_LIST_HEAD(&new_od->buffers); goto retry; } /** * sysfs_put_open_dirent - put sysfs_open_dirent * @sd: target sysfs_dirent * @buffer: associated sysfs_buffer * * Put @sd->s_attr.open and unlink @buffer from the buffers list. * If reference count reaches zero, disassociate and free it. * * LOCKING: * None. */ static void sysfs_put_open_dirent(struct sysfs_dirent *sd, struct sysfs_buffer *buffer) { struct sysfs_open_dirent *od = sd->s_attr.open; unsigned long flags; mutex_lock(&sysfs_open_file_mutex); spin_lock_irqsave(&sysfs_open_dirent_lock, flags); list_del(&buffer->list); if (atomic_dec_and_test(&od->refcnt)) sd->s_attr.open = NULL; else od = NULL; spin_unlock_irqrestore(&sysfs_open_dirent_lock, flags); mutex_unlock(&sysfs_open_file_mutex); kfree(od); } static int sysfs_open_file(struct inode *inode, struct file *file) { struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata; struct kobject *kobj = attr_sd->s_parent->s_dir.kobj; struct sysfs_buffer *buffer; const struct sysfs_ops *ops; int error = -EACCES; /* need attr_sd for attr and ops, its parent for kobj */ if (!sysfs_get_active(attr_sd)) return -ENODEV; /* every kobject with an attribute needs a ktype assigned */ ops = sysfs_file_ops(attr_sd); if (WARN(!ops, KERN_ERR "missing sysfs attribute operations for kobject: %s\n", kobject_name(kobj))) goto err_out; /* File needs write support. * The inode's perms must say it's ok, * and we must have a store method. */ if (file->f_mode & FMODE_WRITE) { if (!(inode->i_mode & S_IWUGO) || !ops->store) goto err_out; } /* File needs read support. * The inode's perms must say it's ok, and we there * must be a show method for it. */ if (file->f_mode & FMODE_READ) { if (!(inode->i_mode & S_IRUGO) || !ops->show) goto err_out; } /* No error? Great, allocate a buffer for the file, and store it * it in file->private_data for easy access. */ error = -ENOMEM; buffer = kzalloc(sizeof(struct sysfs_buffer), GFP_KERNEL); if (!buffer) goto err_out; mutex_init(&buffer->mutex); file->private_data = buffer; /* make sure we have open dirent struct */ error = sysfs_get_open_dirent(attr_sd, buffer); if (error) goto err_free; /* open succeeded, put active references */ sysfs_put_active(attr_sd); return 0; err_free: kfree(buffer); err_out: sysfs_put_active(attr_sd); return error; } static int sysfs_release(struct inode *inode, struct file *filp) { struct sysfs_dirent *sd = filp->f_path.dentry->d_fsdata; struct sysfs_buffer *buffer = filp->private_data; sysfs_put_open_dirent(sd, buffer); if (buffer->page) free_page((unsigned long)buffer->page); kfree(buffer); return 0; } /* Sysfs attribute files are pollable. The idea is that you read * the content and then you use 'poll' or 'select' to wait for * the content to change. When the content changes (assuming the * manager for the kobject supports notification), poll will * return POLLERR|POLLPRI, and select will return the fd whether * it is waiting for read, write, or exceptions. * Once poll/select indicates that the value has changed, you * need to close and re-open the file, or seek to 0 and read again. * Reminder: this only works for attributes which actively support * it, and it is not possible to test an attribute from userspace * to see if it supports poll (Neither 'poll' nor 'select' return * an appropriate error code). When in doubt, set a suitable timeout value. */ static unsigned int sysfs_poll(struct file *filp, poll_table *wait) { struct sysfs_buffer *buffer = filp->private_data; struct sysfs_dirent *attr_sd = filp->f_path.dentry->d_fsdata; struct sysfs_open_dirent *od = attr_sd->s_attr.open; /* need parent for the kobj, grab both */ if (!sysfs_get_active(attr_sd)) goto trigger; poll_wait(filp, &od->poll, wait); sysfs_put_active(attr_sd); if (buffer->event != atomic_read(&od->event)) goto trigger; return DEFAULT_POLLMASK; trigger: return DEFAULT_POLLMASK|POLLERR|POLLPRI; } void sysfs_notify_dirent(struct sysfs_dirent *sd) { struct sysfs_open_dirent *od; unsigned long flags; spin_lock_irqsave(&sysfs_open_dirent_lock, flags); if (!WARN_ON(sysfs_type(sd) != SYSFS_KOBJ_ATTR)) { od = sd->s_attr.open; if (od) { atomic_inc(&od->event); wake_up_interruptible(&od->poll); } } spin_unlock_irqrestore(&sysfs_open_dirent_lock, flags); } EXPORT_SYMBOL_GPL(sysfs_notify_dirent); void sysfs_notify(struct kobject *k, const char *dir, const char *attr) { struct sysfs_dirent *sd = k->sd; mutex_lock(&sysfs_mutex); if (sd && dir) sd = sysfs_find_dirent(sd, dir, NULL); if (sd && attr) sd = sysfs_find_dirent(sd, attr, NULL); if (sd) sysfs_notify_dirent(sd); mutex_unlock(&sysfs_mutex); } EXPORT_SYMBOL_GPL(sysfs_notify); const struct file_operations sysfs_file_operations = { .read = sysfs_read_file, .write = sysfs_write_file, .llseek = generic_file_llseek, .open = sysfs_open_file, .release = sysfs_release, .poll = sysfs_poll, }; int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd, const struct attribute *attr, int type, umode_t amode, const void *ns) { umode_t mode = (amode & S_IALLUGO) | S_IFREG; struct sysfs_addrm_cxt acxt; struct sysfs_dirent *sd; int rc; sd = sysfs_new_dirent(attr->name, mode, type); if (!sd) return -ENOMEM; sd->s_ns = ns; sd->s_attr.attr = (void *)attr; sysfs_dirent_init_lockdep(sd); sysfs_addrm_start(&acxt); rc = sysfs_add_one(&acxt, sd, dir_sd); sysfs_addrm_finish(&acxt); if (rc) sysfs_put(sd); return rc; } int sysfs_add_file(struct sysfs_dirent *dir_sd, const struct attribute *attr, int type) { return sysfs_add_file_mode_ns(dir_sd, attr, type, attr->mode, NULL); } /** * sysfs_create_file_ns - create an attribute file for an object with custom ns * @kobj: object we're creating for * @attr: attribute descriptor * @ns: namespace the new file should belong to */ int sysfs_create_file_ns(struct kobject *kobj, const struct attribute *attr, const void *ns) { BUG_ON(!kobj || !kobj->sd || !attr); return sysfs_add_file_mode_ns(kobj->sd, attr, SYSFS_KOBJ_ATTR, attr->mode, ns); } EXPORT_SYMBOL_GPL(sysfs_create_file_ns); int sysfs_create_files(struct kobject *kobj, const struct attribute **ptr) { int err = 0; int i; for (i = 0; ptr[i] && !err; i++) err = sysfs_create_file(kobj, ptr[i]); if (err) while (--i >= 0) sysfs_remove_file(kobj, ptr[i]); return err; } EXPORT_SYMBOL_GPL(sysfs_create_files); /** * sysfs_add_file_to_group - add an attribute file to a pre-existing group. * @kobj: object we're acting for. * @attr: attribute descriptor. * @group: group name. */ int sysfs_add_file_to_group(struct kobject *kobj, const struct attribute *attr, const char *group) { struct sysfs_dirent *dir_sd; int error; if (group) dir_sd = sysfs_get_dirent(kobj->sd, group); else dir_sd = sysfs_get(kobj->sd); if (!dir_sd) return -ENOENT; error = sysfs_add_file(dir_sd, attr, SYSFS_KOBJ_ATTR); sysfs_put(dir_sd); return error; } EXPORT_SYMBOL_GPL(sysfs_add_file_to_group); /** * sysfs_chmod_file - update the modified mode value on an object attribute. * @kobj: object we're acting for. * @attr: attribute descriptor. * @mode: file permissions. * */ int sysfs_chmod_file(struct kobject *kobj, const struct attribute *attr, umode_t mode) { struct sysfs_dirent *sd; struct iattr newattrs; int rc; mutex_lock(&sysfs_mutex); rc = -ENOENT; sd = sysfs_find_dirent(kobj->sd, attr->name, NULL); if (!sd) goto out; newattrs.ia_mode = (mode & S_IALLUGO) | (sd->s_mode & ~S_IALLUGO); newattrs.ia_valid = ATTR_MODE; rc = sysfs_sd_setattr(sd, &newattrs); out: mutex_unlock(&sysfs_mutex); return rc; } EXPORT_SYMBOL_GPL(sysfs_chmod_file); /** * sysfs_remove_file_ns - remove an object attribute with a custom ns tag * @kobj: object we're acting for * @attr: attribute descriptor * @ns: namespace tag of the file to remove * * Hash the attribute name and namespace tag and kill the victim. */ void sysfs_remove_file_ns(struct kobject *kobj, const struct attribute *attr, const void *ns) { struct sysfs_dirent *dir_sd = kobj->sd; sysfs_hash_and_remove(dir_sd, attr->name, ns); } EXPORT_SYMBOL_GPL(sysfs_remove_file_ns); void sysfs_remove_files(struct kobject *kobj, const struct attribute **ptr) { int i; for (i = 0; ptr[i]; i++) sysfs_remove_file(kobj, ptr[i]); } EXPORT_SYMBOL_GPL(sysfs_remove_files); /** * sysfs_remove_file_from_group - remove an attribute file from a group. * @kobj: object we're acting for. * @attr: attribute descriptor. * @group: group name. */ void sysfs_remove_file_from_group(struct kobject *kobj, const struct attribute *attr, const char *group) { struct sysfs_dirent *dir_sd; if (group) dir_sd = sysfs_get_dirent(kobj->sd, group); else dir_sd = sysfs_get(kobj->sd); if (dir_sd) { sysfs_hash_and_remove(dir_sd, attr->name, NULL); sysfs_put(dir_sd); } } EXPORT_SYMBOL_GPL(sysfs_remove_file_from_group); struct sysfs_schedule_callback_struct { struct list_head workq_list; struct kobject *kobj; void (*func)(void *); void *data; struct module *owner; struct work_struct work; }; static struct workqueue_struct *sysfs_workqueue; static DEFINE_MUTEX(sysfs_workq_mutex); static LIST_HEAD(sysfs_workq); static void sysfs_schedule_callback_work(struct work_struct *work) { struct sysfs_schedule_callback_struct *ss = container_of(work, struct sysfs_schedule_callback_struct, work); (ss->func)(ss->data); kobject_put(ss->kobj); module_put(ss->owner); mutex_lock(&sysfs_workq_mutex); list_del(&ss->workq_list); mutex_unlock(&sysfs_workq_mutex); kfree(ss); } /** * sysfs_schedule_callback - helper to schedule a callback for a kobject * @kobj: object we're acting for. * @func: callback function to invoke later. * @data: argument to pass to @func. * @owner: module owning the callback code * * sysfs attribute methods must not unregister themselves or their parent * kobject (which would amount to the same thing). Attempts to do so will * deadlock, since unregistration is mutually exclusive with driver * callbacks. * * Instead methods can call this routine, which will attempt to allocate * and schedule a workqueue request to call back @func with @data as its * argument in the workqueue's process context. @kobj will be pinned * until @func returns. * * Returns 0 if the request was submitted, -ENOMEM if storage could not * be allocated, -ENODEV if a reference to @owner isn't available, * -EAGAIN if a callback has already been scheduled for @kobj. */ int sysfs_schedule_callback(struct kobject *kobj, void (*func)(void *), void *data, struct module *owner) { struct sysfs_schedule_callback_struct *ss, *tmp; if (!try_module_get(owner)) return -ENODEV; mutex_lock(&sysfs_workq_mutex); list_for_each_entry_safe(ss, tmp, &sysfs_workq, workq_list) if (ss->kobj == kobj) { module_put(owner); mutex_unlock(&sysfs_workq_mutex); return -EAGAIN; } mutex_unlock(&sysfs_workq_mutex); if (sysfs_workqueue == NULL) { sysfs_workqueue = create_singlethread_workqueue("sysfsd"); if (sysfs_workqueue == NULL) { module_put(owner); return -ENOMEM; } } ss = kmalloc(sizeof(*ss), GFP_KERNEL); if (!ss) { module_put(owner); return -ENOMEM; } kobject_get(kobj); ss->kobj = kobj; ss->func = func; ss->data = data; ss->owner = owner; INIT_WORK(&ss->work, sysfs_schedule_callback_work); INIT_LIST_HEAD(&ss->workq_list); mutex_lock(&sysfs_workq_mutex); list_add_tail(&ss->workq_list, &sysfs_workq); mutex_unlock(&sysfs_workq_mutex); queue_work(sysfs_workqueue, &ss->work); return 0; } EXPORT_SYMBOL_GPL(sysfs_schedule_callback);
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