summaryrefslogtreecommitdiff
path: root/fs/kernfs/file.c
diff options
context:
space:
mode:
authorTejun Heo <tj@kernel.org>2013-11-28 23:54:34 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-11-30 06:08:39 +0400
commit414985ae23c031efbd6d16d484dea8b5de28b8f7 (patch)
tree06813b5fec1e2e46d9a86cd79e0dd9d23a8d51a0 /fs/kernfs/file.c
parentfd7b9f7b9776b11df629e9dd3865320bf57ce588 (diff)
downloadlinux-414985ae23c031efbd6d16d484dea8b5de28b8f7.tar.xz
sysfs, kernfs: move file core code to fs/kernfs/file.c
Move core file code to fs/kernfs/file.c. fs/sysfs/file.c now contains sysfs kernfs_ops callbacks, sysfs wrappers around kernfs interfaces, and sysfs_schedule_callback(). The respective declarations in fs/sysfs/sysfs.h are moved to fs/kernfs/kernfs-internal.h. This is pure relocation. v2: Refreshed on top of the v2 of "sysfs, kernfs: prepare read path for kernfs". v3: Refreshed on top of the v3 of "sysfs, kernfs: prepare read path for kernfs". Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/kernfs/file.c')
-rw-r--r--fs/kernfs/file.c805
1 files changed, 805 insertions, 0 deletions
diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c
index 90b1e88dad44..fa172e86047f 100644
--- a/fs/kernfs/file.c
+++ b/fs/kernfs/file.c
@@ -7,3 +7,808 @@
*
* This file is released under the GPLv2.
*/
+
+#include <linux/fs.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/poll.h>
+#include <linux/pagemap.h>
+#include <linux/poll.h>
+#include <linux/sched.h>
+
+#include "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 */
+};
+
+static struct sysfs_open_file *sysfs_of(struct file *file)
+{
+ return ((struct seq_file *)file->private_data)->private;
+}
+
+/*
+ * Determine the kernfs_ops for the given sysfs_dirent. This function must
+ * be called while holding an active reference.
+ */
+static const struct kernfs_ops *kernfs_ops(struct sysfs_dirent *sd)
+{
+ if (sd->s_flags & SYSFS_FLAG_LOCKDEP)
+ lockdep_assert_held(sd);
+ return sd->s_attr.ops;
+}
+
+static void *kernfs_seq_start(struct seq_file *sf, loff_t *ppos)
+{
+ struct sysfs_open_file *of = sf->private;
+ const struct kernfs_ops *ops;
+
+ /*
+ * @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))
+ return ERR_PTR(-ENODEV);
+
+ ops = kernfs_ops(of->sd);
+ if (ops->seq_start) {
+ return ops->seq_start(sf, ppos);
+ } else {
+ /*
+ * The same behavior and code as single_open(). Returns
+ * !NULL if pos is at the beginning; otherwise, NULL.
+ */
+ return NULL + !*ppos;
+ }
+}
+
+static void *kernfs_seq_next(struct seq_file *sf, void *v, loff_t *ppos)
+{
+ struct sysfs_open_file *of = sf->private;
+ const struct kernfs_ops *ops = kernfs_ops(of->sd);
+
+ if (ops->seq_next) {
+ return ops->seq_next(sf, v, ppos);
+ } else {
+ /*
+ * The same behavior and code as single_open(), always
+ * terminate after the initial read.
+ */
+ ++*ppos;
+ return NULL;
+ }
+}
+
+static void kernfs_seq_stop(struct seq_file *sf, void *v)
+{
+ struct sysfs_open_file *of = sf->private;
+ const struct kernfs_ops *ops = kernfs_ops(of->sd);
+
+ if (ops->seq_stop)
+ ops->seq_stop(sf, v);
+
+ sysfs_put_active(of->sd);
+ mutex_unlock(&of->mutex);
+}
+
+static int kernfs_seq_show(struct seq_file *sf, void *v)
+{
+ struct sysfs_open_file *of = sf->private;
+
+ of->event = atomic_read(&of->sd->s_attr.open->event);
+
+ return of->sd->s_attr.ops->seq_show(sf, v);
+}
+
+static const struct seq_operations kernfs_seq_ops = {
+ .start = kernfs_seq_start,
+ .next = kernfs_seq_next,
+ .stop = kernfs_seq_stop,
+ .show = kernfs_seq_show,
+};
+
+/*
+ * 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 kernfs_file_direct_read(struct sysfs_open_file *of,
+ char __user *user_buf, size_t count,
+ loff_t *ppos)
+{
+ ssize_t len = min_t(size_t, count, PAGE_SIZE);
+ const struct kernfs_ops *ops;
+ char *buf;
+
+ buf = kmalloc(len, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ /*
+ * @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)) {
+ len = -ENODEV;
+ mutex_unlock(&of->mutex);
+ goto out_free;
+ }
+
+ ops = kernfs_ops(of->sd);
+ if (ops->read)
+ len = ops->read(of, buf, len, *ppos);
+ else
+ len = -EINVAL;
+
+ sysfs_put_active(of->sd);
+ mutex_unlock(&of->mutex);
+
+ if (len < 0)
+ goto out_free;
+
+ if (copy_to_user(user_buf, buf, len)) {
+ len = -EFAULT;
+ goto out_free;
+ }
+
+ *ppos += len;
+
+ out_free:
+ kfree(buf);
+ return len;
+}
+
+/**
+ * kernfs_file_read - kernfs vfs read callback
+ * @file: file pointer
+ * @user_buf: data to write
+ * @count: number of bytes
+ * @ppos: starting offset
+ */
+static ssize_t kernfs_file_read(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct sysfs_open_file *of = sysfs_of(file);
+
+ if (of->sd->s_flags & SYSFS_FLAG_HAS_SEQ_SHOW)
+ return seq_read(file, user_buf, count, ppos);
+ else
+ return kernfs_file_direct_read(of, user_buf, count, ppos);
+}
+
+/**
+ * kernfs_file_write - kernfs vfs write callback
+ * @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 kernfs write
+ * operation.
+ *
+ * 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 kernfs_file_write(struct file *file, const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct sysfs_open_file *of = sysfs_of(file);
+ ssize_t len = min_t(size_t, count, PAGE_SIZE);
+ const struct kernfs_ops *ops;
+ char *buf;
+
+ buf = kmalloc(len + 1, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ if (copy_from_user(buf, user_buf, len)) {
+ len = -EFAULT;
+ goto out_free;
+ }
+ buf[len] = '\0'; /* guarantee string termination */
+
+ /*
+ * @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);
+ len = -ENODEV;
+ goto out_free;
+ }
+
+ ops = kernfs_ops(of->sd);
+ if (ops->write)
+ len = ops->write(of, buf, len, *ppos);
+ else
+ len = -EINVAL;
+
+ sysfs_put_active(of->sd);
+ mutex_unlock(&of->mutex);
+
+ if (len > 0)
+ *ppos += len;
+out_free:
+ kfree(buf);
+ return len;
+}
+
+static void kernfs_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);
+}
+
+static int kernfs_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+ struct file *file = vma->vm_file;
+ struct sysfs_open_file *of = sysfs_of(file);
+ int ret;
+
+ 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;
+}
+
+static int kernfs_vma_page_mkwrite(struct vm_area_struct *vma,
+ struct vm_fault *vmf)
+{
+ struct file *file = vma->vm_file;
+ struct sysfs_open_file *of = sysfs_of(file);
+ int ret;
+
+ if (!of->vm_ops)
+ return VM_FAULT_SIGBUS;
+
+ 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);
+ else
+ file_update_time(file);
+
+ sysfs_put_active(of->sd);
+ return ret;
+}
+
+static int kernfs_vma_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 kernfs_vma_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 *kernfs_vma_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 kernfs_vma_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 kernfs_vm_ops = {
+ .open = kernfs_vma_open,
+ .fault = kernfs_vma_fault,
+ .page_mkwrite = kernfs_vma_page_mkwrite,
+ .access = kernfs_vma_access,
+#ifdef CONFIG_NUMA
+ .set_policy = kernfs_vma_set_policy,
+ .get_policy = kernfs_vma_get_policy,
+ .migrate = kernfs_vma_migrate,
+#endif
+};
+
+static int kernfs_file_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ struct sysfs_open_file *of = sysfs_of(file);
+ const struct kernfs_ops *ops;
+ int rc;
+
+ mutex_lock(&of->mutex);
+
+ rc = -ENODEV;
+ if (!sysfs_get_active(of->sd))
+ goto out_unlock;
+
+ ops = kernfs_ops(of->sd);
+ if (ops->mmap)
+ rc = ops->mmap(of, 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;
+
+ /*
+ * 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 = &kernfs_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;
+ }
+
+ 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;
+ }
+
+ /* 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->files);
+ goto retry;
+}
+
+/**
+ * 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;
+
+ mutex_lock(&sysfs_open_file_mutex);
+ spin_lock_irqsave(&sysfs_open_dirent_lock, flags);
+
+ if (of)
+ list_del(&of->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 kernfs_file_open(struct inode *inode, struct file *file)
+{
+ struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+ const struct kernfs_ops *ops;
+ struct sysfs_open_file *of;
+ bool has_read, has_write, has_mmap;
+ int error = -EACCES;
+
+ if (!sysfs_get_active(attr_sd))
+ return -ENODEV;
+
+ ops = kernfs_ops(attr_sd);
+
+ has_read = ops->seq_show || ops->read || ops->mmap;
+ has_write = ops->write || ops->mmap;
+ has_mmap = ops->mmap;
+
+ /* 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 has mmap or not for now.
+ */
+ if (has_mmap)
+ 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 (ops->seq_show)
+ error = seq_open(file, &kernfs_seq_ops);
+ else
+ error = seq_open(file, NULL);
+ if (error)
+ goto err_free;
+
+ ((struct seq_file *)file->private_data)->private = of;
+
+ /* 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:
+ seq_release(inode, file);
+err_free:
+ kfree(of);
+err_out:
+ sysfs_put_active(attr_sd);
+ return error;
+}
+
+static int kernfs_file_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);
+ seq_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 (!(sd->s_flags & SYSFS_FLAG_HAS_MMAP))
+ 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);
+ }
+ 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 kernfs_file_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;
+}
+
+/**
+ * kernfs_notify - notify a kernfs file
+ * @sd: file to notify
+ *
+ * Notify @sd such that poll(2) on @sd wakes up.
+ */
+void kernfs_notify(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(kernfs_notify);
+
+const struct file_operations kernfs_file_operations = {
+ .read = kernfs_file_read,
+ .write = kernfs_file_write,
+ .llseek = generic_file_llseek,
+ .mmap = kernfs_file_mmap,
+ .open = kernfs_file_open,
+ .release = kernfs_file_release,
+ .poll = kernfs_file_poll,
+};
+
+/**
+ * kernfs_create_file_ns_key - create a file
+ * @parent: directory to create the file in
+ * @name: name of the file
+ * @mode: mode of the file
+ * @size: size of the file
+ * @ops: kernfs operations for the file
+ * @priv: private data for the file
+ * @ns: optional namespace tag of the file
+ * @key: lockdep key for the file's active_ref, %NULL to disable lockdep
+ *
+ * Returns the created node on success, ERR_PTR() value on error.
+ */
+struct sysfs_dirent *kernfs_create_file_ns_key(struct sysfs_dirent *parent,
+ const char *name,
+ umode_t mode, loff_t size,
+ const struct kernfs_ops *ops,
+ void *priv, const void *ns,
+ struct lock_class_key *key)
+{
+ struct sysfs_addrm_cxt acxt;
+ struct sysfs_dirent *sd;
+ int rc;
+
+ sd = sysfs_new_dirent(name, (mode & S_IALLUGO) | S_IFREG,
+ SYSFS_KOBJ_ATTR);
+ if (!sd)
+ return ERR_PTR(-ENOMEM);
+
+ sd->s_attr.ops = ops;
+ sd->s_attr.size = size;
+ sd->s_ns = ns;
+ sd->priv = priv;
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ if (key) {
+ lockdep_init_map(&sd->dep_map, "s_active", key, 0);
+ sd->s_flags |= SYSFS_FLAG_LOCKDEP;
+ }
+#endif
+
+ /*
+ * sd->s_attr.ops is accesible only while holding active ref. We
+ * need to know whether some ops are implemented outside active
+ * ref. Cache their existence in flags.
+ */
+ if (ops->seq_show)
+ sd->s_flags |= SYSFS_FLAG_HAS_SEQ_SHOW;
+ if (ops->mmap)
+ sd->s_flags |= SYSFS_FLAG_HAS_MMAP;
+
+ sysfs_addrm_start(&acxt);
+ rc = sysfs_add_one(&acxt, sd, parent);
+ sysfs_addrm_finish(&acxt);
+
+ if (rc) {
+ kernfs_put(sd);
+ return ERR_PTR(rc);
+ }
+ return sd;
+}