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authorTejun Heo <tj@kernel.org>2013-11-28 14:54:34 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-11-29 18:08:39 -0800
commit414985ae23c031efbd6d16d484dea8b5de28b8f7 (patch)
tree06813b5fec1e2e46d9a86cd79e0dd9d23a8d51a0 /fs/sysfs/file.c
parentfd7b9f7b9776b11df629e9dd3865320bf57ce588 (diff)
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/sysfs/file.c')
-rw-r--r--fs/sysfs/file.c802
1 files changed, 1 insertions, 801 deletions
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 7f0a79fa2ed8..ac77d2be3c31 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -14,54 +14,12 @@
#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"
-
-/*
- * 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;
-}
+#include "../kernfs/kernfs-internal.h"
/*
* Determine ktype->sysfs_ops for the given sysfs_dirent. This function
@@ -143,147 +101,6 @@ static ssize_t sysfs_kf_bin_read(struct sysfs_open_file *of, char *buf,
return battr->read(of->file, kobj, battr, buf, pos, count);
}
-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 write callback for regular sysfs files */
static ssize_t sysfs_kf_write(struct sysfs_open_file *of, char *buf,
size_t count, loff_t pos)
@@ -319,67 +136,6 @@ static ssize_t sysfs_kf_bin_write(struct sysfs_open_file *of, char *buf,
return battr->write(of->file, kobj, battr, buf, pos, count);
}
-/**
- * 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 int sysfs_kf_bin_mmap(struct sysfs_open_file *of,
struct vm_area_struct *vma)
{
@@ -392,490 +148,6 @@ static int sysfs_kf_bin_mmap(struct sysfs_open_file *of,
return battr->mmap(of->file, kobj, battr, vma);
}
-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);
-
void sysfs_notify(struct kobject *k, const char *dir, const char *attr)
{
struct sysfs_dirent *sd = k->sd, *tmp;
@@ -898,16 +170,6 @@ void sysfs_notify(struct kobject *k, const char *dir, const char *attr)
}
EXPORT_SYMBOL_GPL(sysfs_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,
-};
-
static const struct kernfs_ops sysfs_file_kfops_empty = {
};
@@ -996,68 +258,6 @@ int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd,
return 0;
}
-/**
- * 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;
-}
-
int sysfs_add_file(struct sysfs_dirent *dir_sd, const struct attribute *attr,
bool is_bin)
{