sysfs, kernfs: move file core code to fs/kernfs/file.c (414985ae) · Commits · e / devices / android_kernel_fairphone_FP5

fs/kernfs/file.c

+805 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}

fs/kernfs/kernfs-internal.h

+7 −0

Original line number	Diff line number	Diff line
		@@ -142,4 +142,11 @@ int sysfs_add_one(struct sysfs_addrm_cxt acxt, struct sysfs_dirent sd,
		void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt);
		struct sysfs_dirent sysfs_new_dirent(const char name, umode_t mode, int type);

		/*
		* file.c
		*/
		extern const struct file_operations kernfs_file_operations;

		void sysfs_unmap_bin_file(struct sysfs_dirent *sd);

		#endif /* __KERNFS_INTERNAL_H */

fs/sysfs/file.c

+1 −801

File changed.

Preview size limit exceeded, changes collapsed.

fs/sysfs/sysfs.h

+0 −4

Original line number	Diff line number	Diff line
		@@ -41,15 +41,11 @@ void sysfs_warn_dup(struct sysfs_dirent parent, const char name);
		/*
		* file.c
		*/
		extern const struct file_operations kernfs_file_operations;

		int sysfs_add_file(struct sysfs_dirent *dir_sd,
		const struct attribute *attr, bool is_bin);

		int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd,
		const struct attribute *attr, bool is_bin,
		umode_t amode, const void *ns);
		void sysfs_unmap_bin_file(struct sysfs_dirent *sd);

		/*
		* symlink.c