#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 <linux/seq_file.h>
-#include <linux/mm.h>
#include "sysfs.h"
+#include "../kernfs/kernfs-internal.h"
/*
- * There's one sysfs_open_file 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 seq_file whose ->private points to
- * sysfs_open_file. sysfs_open_files are chained at
- * sysfs_open_dirent->files, 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 files; /* goes through sysfs_open_file.list */
-};
-
-struct sysfs_open_file {
- struct sysfs_dirent *sd;
- struct file *file;
- struct mutex mutex;
- int event;
- struct list_head list;
-
- bool mmapped;
- const struct vm_operations_struct *vm_ops;
-};
-
-static bool sysfs_is_bin(struct sysfs_dirent *sd)
-{
- return sysfs_type(sd) == SYSFS_KOBJ_BIN_ATTR;
-}
-
-static struct sysfs_open_file *sysfs_of(struct file *file)
-{
- return ((struct seq_file *)file->private_data)->private;
-}
-
-/*
- * Determine ktype->sysfs_ops for the given sysfs_dirent. This function
+ * Determine ktype->sysfs_ops for the given kernfs_node. This function
* must be called while holding an active reference.
*/
-static const struct sysfs_ops *sysfs_file_ops(struct sysfs_dirent *sd)
+static const struct sysfs_ops *sysfs_file_ops(struct kernfs_node *kn)
{
- struct kobject *kobj = sd->s_parent->s_dir.kobj;
+ struct kobject *kobj = kn->parent->priv;
- if (!sysfs_ignore_lockdep(sd))
- lockdep_assert_held(sd);
+ if (kn->flags & KERNFS_LOCKDEP)
+ lockdep_assert_held(kn);
return kobj->ktype ? kobj->ktype->sysfs_ops : NULL;
}
* details like buffering and seeking. The following function pipes
* sysfs_ops->show() result through seq_file.
*/
-static int sysfs_seq_show(struct seq_file *sf, void *v)
+static int sysfs_kf_seq_show(struct seq_file *sf, void *v)
{
- struct sysfs_open_file *of = sf->private;
- struct kobject *kobj = of->sd->s_parent->s_dir.kobj;
- const struct sysfs_ops *ops;
- char *buf;
+ struct kernfs_open_file *of = sf->private;
+ struct kobject *kobj = of->kn->parent->priv;
+ const struct sysfs_ops *ops = sysfs_file_ops(of->kn);
ssize_t count;
+ char *buf;
/* acquire buffer and ensure that it's >= PAGE_SIZE */
count = seq_get_buf(sf, &buf);
}
/*
- * Need @of->sd for attr and ops, its parent for kobj. @of->mutex
- * nests outside active ref and is just to ensure that the ops
- * aren't called concurrently for the same open file.
+ * Invoke show(). Control may reach here via seq file lseek even
+ * if @ops->show() isn't implemented.
*/
- mutex_lock(&of->mutex);
- if (!sysfs_get_active(of->sd)) {
- mutex_unlock(&of->mutex);
- return -ENODEV;
+ if (ops->show) {
+ count = ops->show(kobj, of->kn->priv, buf);
+ if (count < 0)
+ return count;
}
- of->event = atomic_read(&of->sd->s_attr.open->event);
-
- /*
- * Lookup @ops and invoke show(). Control may reach here via seq
- * file lseek even if @ops->show() isn't implemented.
- */
- ops = sysfs_file_ops(of->sd);
- if (ops->show)
- count = ops->show(kobj, of->sd->s_attr.attr, buf);
- else
- count = 0;
-
- sysfs_put_active(of->sd);
- mutex_unlock(&of->mutex);
-
- if (count < 0)
- return count;
-
/*
* The code works fine with PAGE_SIZE return but it's likely to
* indicate truncated result or overflow in normal use cases.
return 0;
}
-/*
- * Read method for bin files. As reading a bin file can have side-effects,
- * the exact offset and bytes specified in read(2) call should be passed to
- * the read callback making it difficult to use seq_file. Implement
- * simplistic custom buffering for bin files.
- */
-static ssize_t sysfs_bin_read(struct file *file, char __user *userbuf,
- size_t bytes, loff_t *off)
+static ssize_t sysfs_kf_bin_read(struct kernfs_open_file *of, char *buf,
+ size_t count, loff_t pos)
{
- struct sysfs_open_file *of = sysfs_of(file);
- struct bin_attribute *battr = of->sd->s_attr.bin_attr;
- struct kobject *kobj = of->sd->s_parent->s_dir.kobj;
- loff_t size = file_inode(file)->i_size;
- int count = min_t(size_t, bytes, PAGE_SIZE);
- loff_t offs = *off;
- char *buf;
+ struct bin_attribute *battr = of->kn->priv;
+ struct kobject *kobj = of->kn->parent->priv;
+ loff_t size = file_inode(of->file)->i_size;
- if (!bytes)
+ if (!count)
return 0;
if (size) {
- if (offs > size)
+ if (pos > size)
return 0;
- if (offs + count > size)
- count = size - offs;
- }
-
- buf = kmalloc(count, GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
-
- /* need of->sd for battr, its parent for kobj */
- mutex_lock(&of->mutex);
- if (!sysfs_get_active(of->sd)) {
- count = -ENODEV;
- mutex_unlock(&of->mutex);
- goto out_free;
- }
-
- if (battr->read)
- count = battr->read(file, kobj, battr, buf, offs, count);
- else
- count = -EIO;
-
- sysfs_put_active(of->sd);
- mutex_unlock(&of->mutex);
-
- if (count < 0)
- goto out_free;
-
- if (copy_to_user(userbuf, buf, count)) {
- count = -EFAULT;
- goto out_free;
+ if (pos + count > size)
+ count = size - pos;
}
- pr_debug("offs = %lld, *off = %lld, count = %d\n", offs, *off, count);
-
- *off = offs + count;
+ if (!battr->read)
+ return -EIO;
- out_free:
- kfree(buf);
- return count;
+ return battr->read(of->file, kobj, battr, buf, pos, count);
}
-/**
- * flush_write_buffer - push buffer to kobject
- * @of: open file
- * @buf: data buffer for file
- * @off: file offset to write to
- * @count: number of bytes
- *
- * Get the correct pointers for the kobject and the attribute we're dealing
- * with, then call the store() method for it with @buf.
- */
-static int flush_write_buffer(struct sysfs_open_file *of, char *buf, loff_t off,
- size_t count)
+/* kernfs write callback for regular sysfs files */
+static ssize_t sysfs_kf_write(struct kernfs_open_file *of, char *buf,
+ size_t count, loff_t pos)
{
- struct kobject *kobj = of->sd->s_parent->s_dir.kobj;
- int rc = 0;
-
- /*
- * Need @of->sd for attr and ops, its parent for kobj. @of->mutex
- * nests outside active ref and is just to ensure that the ops
- * aren't called concurrently for the same open file.
- */
- mutex_lock(&of->mutex);
- if (!sysfs_get_active(of->sd)) {
- mutex_unlock(&of->mutex);
- return -ENODEV;
- }
+ const struct sysfs_ops *ops = sysfs_file_ops(of->kn);
+ struct kobject *kobj = of->kn->parent->priv;
- if (sysfs_is_bin(of->sd)) {
- struct bin_attribute *battr = of->sd->s_attr.bin_attr;
-
- rc = -EIO;
- if (battr->write)
- rc = battr->write(of->file, kobj, battr, buf, off,
- count);
- } else {
- const struct sysfs_ops *ops = sysfs_file_ops(of->sd);
-
- rc = ops->store(kobj, of->sd->s_attr.attr, buf, count);
- }
-
- sysfs_put_active(of->sd);
- mutex_unlock(&of->mutex);
+ if (!count)
+ return 0;
- return rc;
+ return ops->store(kobj, of->kn->priv, buf, count);
}
-/**
- * sysfs_write_file - write an attribute
- * @file: file pointer
- * @user_buf: data to write
- * @count: number of bytes
- * @ppos: starting offset
- *
- * Copy data in from userland and pass it to the matching
- * sysfs_ops->store() by invoking 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 *user_buf,
- size_t count, loff_t *ppos)
+/* kernfs write callback for bin sysfs files */
+static ssize_t sysfs_kf_bin_write(struct kernfs_open_file *of, char *buf,
+ size_t count, loff_t pos)
{
- struct sysfs_open_file *of = sysfs_of(file);
- ssize_t len = min_t(size_t, count, PAGE_SIZE);
- loff_t size = file_inode(file)->i_size;
- char *buf;
+ struct bin_attribute *battr = of->kn->priv;
+ struct kobject *kobj = of->kn->parent->priv;
+ loff_t size = file_inode(of->file)->i_size;
- if (sysfs_is_bin(of->sd) && size) {
- if (size <= *ppos)
+ if (size) {
+ if (size <= pos)
return 0;
- len = min_t(ssize_t, len, size - *ppos);
+ count = min_t(ssize_t, count, size - pos);
}
-
- if (!len)
+ if (!count)
return 0;
- buf = kmalloc(len + 1, GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
+ if (!battr->write)
+ return -EIO;
- if (copy_from_user(buf, user_buf, len)) {
- len = -EFAULT;
- goto out_free;
- }
- buf[len] = '\0'; /* guarantee string termination */
-
- len = flush_write_buffer(of, buf, *ppos, len);
- if (len > 0)
- *ppos += len;
-out_free:
- kfree(buf);
- return len;
-}
-
-static void sysfs_bin_vma_open(struct vm_area_struct *vma)
-{
- struct file *file = vma->vm_file;
- struct sysfs_open_file *of = sysfs_of(file);
-
- if (!of->vm_ops)
- return;
-
- if (!sysfs_get_active(of->sd))
- return;
-
- if (of->vm_ops->open)
- of->vm_ops->open(vma);
-
- sysfs_put_active(of->sd);
+ return battr->write(of->file, kobj, battr, buf, pos, count);
}
-static int sysfs_bin_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
+static int sysfs_kf_bin_mmap(struct kernfs_open_file *of,
+ struct vm_area_struct *vma)
{
- struct file *file = vma->vm_file;
- struct sysfs_open_file *of = sysfs_of(file);
- int ret;
+ struct bin_attribute *battr = of->kn->priv;
+ struct kobject *kobj = of->kn->parent->priv;
- if (!of->vm_ops)
- return VM_FAULT_SIGBUS;
-
- if (!sysfs_get_active(of->sd))
- return VM_FAULT_SIGBUS;
-
- ret = VM_FAULT_SIGBUS;
- if (of->vm_ops->fault)
- ret = of->vm_ops->fault(vma, vmf);
-
- sysfs_put_active(of->sd);
- return ret;
+ return battr->mmap(of->file, kobj, battr, vma);
}
-static int sysfs_bin_page_mkwrite(struct vm_area_struct *vma,
- struct vm_fault *vmf)
+void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr)
{
- struct file *file = vma->vm_file;
- struct sysfs_open_file *of = sysfs_of(file);
- int ret;
-
- if (!of->vm_ops)
- return VM_FAULT_SIGBUS;
+ struct kernfs_node *kn = kobj->sd, *tmp;
- if (!sysfs_get_active(of->sd))
- return VM_FAULT_SIGBUS;
-
- ret = 0;
- if (of->vm_ops->page_mkwrite)
- ret = of->vm_ops->page_mkwrite(vma, vmf);
+ if (kn && dir)
+ kn = kernfs_find_and_get(kn, dir);
else
- file_update_time(file);
-
- sysfs_put_active(of->sd);
- return ret;
-}
-
-static int sysfs_bin_access(struct vm_area_struct *vma, unsigned long addr,
- void *buf, int len, int write)
-{
- struct file *file = vma->vm_file;
- struct sysfs_open_file *of = sysfs_of(file);
- int ret;
-
- if (!of->vm_ops)
- return -EINVAL;
-
- if (!sysfs_get_active(of->sd))
- return -EINVAL;
-
- ret = -EINVAL;
- if (of->vm_ops->access)
- ret = of->vm_ops->access(vma, addr, buf, len, write);
-
- sysfs_put_active(of->sd);
- return ret;
-}
-
-#ifdef CONFIG_NUMA
-static int sysfs_bin_set_policy(struct vm_area_struct *vma,
- struct mempolicy *new)
-{
- struct file *file = vma->vm_file;
- struct sysfs_open_file *of = sysfs_of(file);
- int ret;
-
- if (!of->vm_ops)
- return 0;
-
- if (!sysfs_get_active(of->sd))
- return -EINVAL;
-
- ret = 0;
- if (of->vm_ops->set_policy)
- ret = of->vm_ops->set_policy(vma, new);
-
- sysfs_put_active(of->sd);
- return ret;
-}
-
-static struct mempolicy *sysfs_bin_get_policy(struct vm_area_struct *vma,
- unsigned long addr)
-{
- struct file *file = vma->vm_file;
- struct sysfs_open_file *of = sysfs_of(file);
- struct mempolicy *pol;
-
- if (!of->vm_ops)
- return vma->vm_policy;
-
- if (!sysfs_get_active(of->sd))
- return vma->vm_policy;
-
- pol = vma->vm_policy;
- if (of->vm_ops->get_policy)
- pol = of->vm_ops->get_policy(vma, addr);
-
- sysfs_put_active(of->sd);
- return pol;
-}
-
-static int sysfs_bin_migrate(struct vm_area_struct *vma, const nodemask_t *from,
- const nodemask_t *to, unsigned long flags)
-{
- struct file *file = vma->vm_file;
- struct sysfs_open_file *of = sysfs_of(file);
- int ret;
-
- if (!of->vm_ops)
- return 0;
-
- if (!sysfs_get_active(of->sd))
- return 0;
-
- ret = 0;
- if (of->vm_ops->migrate)
- ret = of->vm_ops->migrate(vma, from, to, flags);
-
- sysfs_put_active(of->sd);
- return ret;
-}
-#endif
-
-static const struct vm_operations_struct sysfs_bin_vm_ops = {
- .open = sysfs_bin_vma_open,
- .fault = sysfs_bin_fault,
- .page_mkwrite = sysfs_bin_page_mkwrite,
- .access = sysfs_bin_access,
-#ifdef CONFIG_NUMA
- .set_policy = sysfs_bin_set_policy,
- .get_policy = sysfs_bin_get_policy,
- .migrate = sysfs_bin_migrate,
-#endif
-};
-
-static int sysfs_bin_mmap(struct file *file, struct vm_area_struct *vma)
-{
- struct sysfs_open_file *of = sysfs_of(file);
- struct bin_attribute *battr = of->sd->s_attr.bin_attr;
- struct kobject *kobj = of->sd->s_parent->s_dir.kobj;
- int rc;
-
- mutex_lock(&of->mutex);
-
- /* need of->sd for battr, its parent for kobj */
- rc = -ENODEV;
- if (!sysfs_get_active(of->sd))
- goto out_unlock;
-
- if (!battr->mmap)
- goto out_put;
-
- rc = battr->mmap(file, kobj, battr, vma);
- if (rc)
- goto out_put;
-
- /*
- * PowerPC's pci_mmap of legacy_mem uses shmem_zero_setup()
- * to satisfy versions of X which crash if the mmap fails: that
- * substitutes a new vm_file, and we don't then want bin_vm_ops.
- */
- if (vma->vm_file != file)
- goto out_put;
-
- rc = -EINVAL;
- if (of->mmapped && of->vm_ops != vma->vm_ops)
- goto out_put;
+ kernfs_get(kn);
- /*
- * It is not possible to successfully wrap close.
- * So error if someone is trying to use close.
- */
- rc = -EINVAL;
- if (vma->vm_ops && vma->vm_ops->close)
- goto out_put;
-
- rc = 0;
- of->mmapped = 1;
- of->vm_ops = vma->vm_ops;
- vma->vm_ops = &sysfs_bin_vm_ops;
-out_put:
- sysfs_put_active(of->sd);
-out_unlock:
- mutex_unlock(&of->mutex);
-
- return rc;
-}
-
-/**
- * sysfs_get_open_dirent - get or create sysfs_open_dirent
- * @sd: target sysfs_dirent
- * @of: sysfs_open_file for this instance of open
- *
- * If @sd->s_attr.open exists, increment its reference count;
- * otherwise, create one. @of is chained to the files 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_open_file *of)
-{
- 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;
+ if (kn && attr) {
+ tmp = kernfs_find_and_get(kn, attr);
+ kernfs_put(kn);
+ kn = tmp;
}
- od = sd->s_attr.open;
- if (od) {
- atomic_inc(&od->refcnt);
- list_add_tail(&of->list, &od->files);
- }
-
- spin_unlock_irq(&sysfs_open_dirent_lock);
- mutex_unlock(&sysfs_open_file_mutex);
-
- if (od) {
- kfree(new_od);
- return 0;
+ if (kn) {
+ kernfs_notify(kn);
+ kernfs_put(kn);
}
+}
+EXPORT_SYMBOL_GPL(sysfs_notify);
- /* not there, initialize a new one and retry */
- new_od = kmalloc(sizeof(*new_od), GFP_KERNEL);
- if (!new_od)
- return -ENOMEM;
+static const struct kernfs_ops sysfs_file_kfops_empty = {
+};
- atomic_set(&new_od->refcnt, 0);
- atomic_set(&new_od->event, 1);
- init_waitqueue_head(&new_od->poll);
- INIT_LIST_HEAD(&new_od->files);
- goto retry;
-}
+static const struct kernfs_ops sysfs_file_kfops_ro = {
+ .seq_show = sysfs_kf_seq_show,
+};
-/**
- * sysfs_put_open_dirent - put sysfs_open_dirent
- * @sd: target sysfs_dirent
- * @of: associated sysfs_open_file
- *
- * Put @sd->s_attr.open and unlink @of from the files list. If
- * reference count reaches zero, disassociate and free it.
- *
- * LOCKING:
- * None.
- */
-static void sysfs_put_open_dirent(struct sysfs_dirent *sd,
- struct sysfs_open_file *of)
-{
- struct sysfs_open_dirent *od = sd->s_attr.open;
- unsigned long flags;
+static const struct kernfs_ops sysfs_file_kfops_wo = {
+ .write = sysfs_kf_write,
+};
- mutex_lock(&sysfs_open_file_mutex);
- spin_lock_irqsave(&sysfs_open_dirent_lock, flags);
+static const struct kernfs_ops sysfs_file_kfops_rw = {
+ .seq_show = sysfs_kf_seq_show,
+ .write = sysfs_kf_write,
+};
- if (of)
- list_del(&of->list);
+static const struct kernfs_ops sysfs_bin_kfops_ro = {
+ .read = sysfs_kf_bin_read,
+};
- if (atomic_dec_and_test(&od->refcnt))
- sd->s_attr.open = NULL;
- else
- od = NULL;
+static const struct kernfs_ops sysfs_bin_kfops_wo = {
+ .write = sysfs_kf_bin_write,
+};
- spin_unlock_irqrestore(&sysfs_open_dirent_lock, flags);
- mutex_unlock(&sysfs_open_file_mutex);
+static const struct kernfs_ops sysfs_bin_kfops_rw = {
+ .read = sysfs_kf_bin_read,
+ .write = sysfs_kf_bin_write,
+};
- kfree(od);
-}
+static const struct kernfs_ops sysfs_bin_kfops_mmap = {
+ .read = sysfs_kf_bin_read,
+ .write = sysfs_kf_bin_write,
+ .mmap = sysfs_kf_bin_mmap,
+};
-static int sysfs_open_file(struct inode *inode, struct file *file)
+int sysfs_add_file_mode_ns(struct kernfs_node *parent,
+ const struct attribute *attr, bool is_bin,
+ umode_t mode, const void *ns)
{
- struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
- struct kobject *kobj = attr_sd->s_parent->s_dir.kobj;
- struct sysfs_open_file *of;
- bool has_read, has_write;
- int error = -EACCES;
-
- /* need attr_sd for attr and ops, its parent for kobj */
- if (!sysfs_get_active(attr_sd))
- return -ENODEV;
+ struct lock_class_key *key = NULL;
+ const struct kernfs_ops *ops;
+ struct kernfs_node *kn;
+ loff_t size;
- if (sysfs_is_bin(attr_sd)) {
- struct bin_attribute *battr = attr_sd->s_attr.bin_attr;
-
- has_read = battr->read || battr->mmap;
- has_write = battr->write || battr->mmap;
- } else {
- const struct sysfs_ops *ops = sysfs_file_ops(attr_sd);
+ if (!is_bin) {
+ struct kobject *kobj = parent->priv;
+ const struct sysfs_ops *sysfs_ops = kobj->ktype->sysfs_ops;
/* every kobject with an attribute needs a ktype assigned */
- if (WARN(!ops, KERN_ERR
+ if (WARN(!sysfs_ops, KERN_ERR
"missing sysfs attribute operations for kobject: %s\n",
kobject_name(kobj)))
- goto err_out;
-
- has_read = ops->show;
- has_write = ops->store;
- }
-
- /* check perms and supported operations */
- if ((file->f_mode & FMODE_WRITE) &&
- (!(inode->i_mode & S_IWUGO) || !has_write))
- goto err_out;
-
- if ((file->f_mode & FMODE_READ) &&
- (!(inode->i_mode & S_IRUGO) || !has_read))
- goto err_out;
-
- /* allocate a sysfs_open_file for the file */
- error = -ENOMEM;
- of = kzalloc(sizeof(struct sysfs_open_file), GFP_KERNEL);
- if (!of)
- goto err_out;
-
- /*
- * The following is done to give a different lockdep key to
- * @of->mutex for files which implement mmap. This is a rather
- * crude way to avoid false positive lockdep warning around
- * mm->mmap_sem - mmap nests @of->mutex under mm->mmap_sem and
- * reading /sys/block/sda/trace/act_mask grabs sr_mutex, under
- * which mm->mmap_sem nests, while holding @of->mutex. As each
- * open file has a separate mutex, it's okay as long as those don't
- * happen on the same file. At this point, we can't easily give
- * each file a separate locking class. Let's differentiate on
- * whether the file is bin or not for now.
- */
- if (sysfs_is_bin(attr_sd))
- mutex_init(&of->mutex);
- else
- mutex_init(&of->mutex);
-
- of->sd = attr_sd;
- of->file = file;
-
- /*
- * Always instantiate seq_file even if read access doesn't use
- * seq_file or is not requested. This unifies private data access
- * and readable regular files are the vast majority anyway.
- */
- if (sysfs_is_bin(attr_sd))
- error = single_open(file, NULL, of);
- else
- error = single_open(file, sysfs_seq_show, of);
- if (error)
- goto err_free;
-
- /* seq_file clears PWRITE unconditionally, restore it if WRITE */
- if (file->f_mode & FMODE_WRITE)
- file->f_mode |= FMODE_PWRITE;
-
- /* make sure we have open dirent struct */
- error = sysfs_get_open_dirent(attr_sd, of);
- if (error)
- goto err_close;
-
- /* open succeeded, put active references */
- sysfs_put_active(attr_sd);
- return 0;
-
-err_close:
- single_release(inode, file);
-err_free:
- kfree(of);
-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_open_file *of = sysfs_of(filp);
-
- sysfs_put_open_dirent(sd, of);
- single_release(inode, filp);
- kfree(of);
-
- return 0;
-}
-
-void sysfs_unmap_bin_file(struct sysfs_dirent *sd)
-{
- struct sysfs_open_dirent *od;
- struct sysfs_open_file *of;
-
- if (!sysfs_is_bin(sd))
- return;
-
- spin_lock_irq(&sysfs_open_dirent_lock);
- od = sd->s_attr.open;
- if (od)
- atomic_inc(&od->refcnt);
- spin_unlock_irq(&sysfs_open_dirent_lock);
- if (!od)
- return;
-
- mutex_lock(&sysfs_open_file_mutex);
- list_for_each_entry(of, &od->files, list) {
- struct inode *inode = file_inode(of->file);
- unmap_mapping_range(inode->i_mapping, 0, 0, 1);
+ return -EINVAL;
+
+ if (sysfs_ops->show && sysfs_ops->store)
+ ops = &sysfs_file_kfops_rw;
+ else if (sysfs_ops->show)
+ ops = &sysfs_file_kfops_ro;
+ else if (sysfs_ops->store)
+ ops = &sysfs_file_kfops_wo;
+ else
+ ops = &sysfs_file_kfops_empty;
+
+ size = PAGE_SIZE;
+ } else {
+ struct bin_attribute *battr = (void *)attr;
+
+ if (battr->mmap)
+ ops = &sysfs_bin_kfops_mmap;
+ else if (battr->read && battr->write)
+ ops = &sysfs_bin_kfops_rw;
+ else if (battr->read)
+ ops = &sysfs_bin_kfops_ro;
+ else if (battr->write)
+ ops = &sysfs_bin_kfops_wo;
+ else
+ ops = &sysfs_file_kfops_empty;
+
+ size = battr->size;
}
- mutex_unlock(&sysfs_open_file_mutex);
-
- sysfs_put_open_dirent(sd, NULL);
-}
-
-/* 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_open_file *of = sysfs_of(filp);
- 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 (of->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);
- }
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ if (!attr->ignore_lockdep)
+ key = attr->key ?: (struct lock_class_key *)&attr->skey;
+#endif
+ kn = __kernfs_create_file(parent, attr->name, mode, size, ops,
+ (void *)attr, ns, true, key);
+ if (IS_ERR(kn)) {
+ if (PTR_ERR(kn) == -EEXIST)
+ sysfs_warn_dup(parent, attr->name);
+ return PTR_ERR(kn);
}
-
- 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 = seq_read,
- .write = sysfs_write_file,
- .llseek = generic_file_llseek,
- .open = sysfs_open_file,
- .release = sysfs_release,
- .poll = sysfs_poll,
-};
-
-const struct file_operations sysfs_bin_operations = {
- .read = sysfs_bin_read,
- .write = sysfs_write_file,
- .llseek = generic_file_llseek,
- .mmap = sysfs_bin_mmap,
- .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;
+ return 0;
}
-
-int sysfs_add_file(struct sysfs_dirent *dir_sd, const struct attribute *attr,
- int type)
+int sysfs_add_file(struct kernfs_node *parent, const struct attribute *attr,
+ bool is_bin)
{
- return sysfs_add_file_mode_ns(dir_sd, attr, type, attr->mode, NULL);
+ return sysfs_add_file_mode_ns(parent, attr, is_bin, attr->mode, NULL);
}
/**
{
BUG_ON(!kobj || !kobj->sd || !attr);
- return sysfs_add_file_mode_ns(kobj->sd, attr, SYSFS_KOBJ_ATTR,
- attr->mode, ns);
+ return sysfs_add_file_mode_ns(kobj->sd, attr, false, attr->mode, ns);
}
EXPORT_SYMBOL_GPL(sysfs_create_file_ns);
int sysfs_add_file_to_group(struct kobject *kobj,
const struct attribute *attr, const char *group)
{
- struct sysfs_dirent *dir_sd;
+ struct kernfs_node *parent;
int error;
- if (group)
- dir_sd = sysfs_get_dirent(kobj->sd, group);
- else
- dir_sd = sysfs_get(kobj->sd);
+ if (group) {
+ parent = kernfs_find_and_get(kobj->sd, group);
+ } else {
+ parent = kobj->sd;
+ kernfs_get(parent);
+ }
- if (!dir_sd)
+ if (!parent)
return -ENOENT;
- error = sysfs_add_file(dir_sd, attr, SYSFS_KOBJ_ATTR);
- sysfs_put(dir_sd);
+ error = sysfs_add_file(parent, attr, false);
+ kernfs_put(parent);
return error;
}
int sysfs_chmod_file(struct kobject *kobj, const struct attribute *attr,
umode_t mode)
{
- struct sysfs_dirent *sd;
+ struct kernfs_node *kn;
struct iattr newattrs;
int rc;
- mutex_lock(&sysfs_mutex);
-
- rc = -ENOENT;
- sd = sysfs_find_dirent(kobj->sd, attr->name, NULL);
- if (!sd)
- goto out;
+ kn = kernfs_find_and_get(kobj->sd, attr->name);
+ if (!kn)
+ return -ENOENT;
- newattrs.ia_mode = (mode & S_IALLUGO) | (sd->s_mode & ~S_IALLUGO);
+ newattrs.ia_mode = (mode & S_IALLUGO) | (kn->mode & ~S_IALLUGO);
newattrs.ia_valid = ATTR_MODE;
- rc = sysfs_sd_setattr(sd, &newattrs);
- out:
- mutex_unlock(&sysfs_mutex);
+ rc = kernfs_setattr(kn, &newattrs);
+
+ kernfs_put(kn);
return rc;
}
EXPORT_SYMBOL_GPL(sysfs_chmod_file);
void sysfs_remove_file_ns(struct kobject *kobj, const struct attribute *attr,
const void *ns)
{
- struct sysfs_dirent *dir_sd = kobj->sd;
+ struct kernfs_node *parent = kobj->sd;
- sysfs_hash_and_remove(dir_sd, attr->name, ns);
+ kernfs_remove_by_name_ns(parent, attr->name, ns);
}
EXPORT_SYMBOL_GPL(sysfs_remove_file_ns);
void sysfs_remove_file_from_group(struct kobject *kobj,
const struct attribute *attr, const char *group)
{
- struct sysfs_dirent *dir_sd;
+ struct kernfs_node *parent;
- 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);
+ if (group) {
+ parent = kernfs_find_and_get(kobj->sd, group);
+ } else {
+ parent = kobj->sd;
+ kernfs_get(parent);
+ }
+
+ if (parent) {
+ kernfs_remove_by_name(parent, attr->name);
+ kernfs_put(parent);
}
}
EXPORT_SYMBOL_GPL(sysfs_remove_file_from_group);
{
BUG_ON(!kobj || !kobj->sd || !attr);
- return sysfs_add_file(kobj->sd, &attr->attr, SYSFS_KOBJ_BIN_ATTR);
+ return sysfs_add_file(kobj->sd, &attr->attr, true);
}
EXPORT_SYMBOL_GPL(sysfs_create_bin_file);
void sysfs_remove_bin_file(struct kobject *kobj,
const struct bin_attribute *attr)
{
- sysfs_hash_and_remove(kobj->sd, attr->attr.name, NULL);
+ kernfs_remove_by_name(kobj->sd, attr->attr.name);
}
EXPORT_SYMBOL_GPL(sysfs_remove_bin_file);
projects / ~andy / linux / blobdiff