#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.
+ * There's one kernfs_open_file for each open file and one kernfs_open_node
+ * for each kernfs_node 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.
+ * kernfs_node->attr.open points to kernfs_open_node. attr.open is
+ * protected by kernfs_open_node_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.
+ * kernfs_open_file. kernfs_open_files are chained at
+ * kernfs_open_node->files, which is protected by kernfs_open_file_mutex.
*/
-static DEFINE_SPINLOCK(sysfs_open_dirent_lock);
-static DEFINE_MUTEX(sysfs_open_file_mutex);
+static DEFINE_SPINLOCK(kernfs_open_node_lock);
+static DEFINE_MUTEX(kernfs_open_file_mutex);
-struct sysfs_open_dirent {
+struct kernfs_open_node {
atomic_t refcnt;
atomic_t event;
wait_queue_head_t poll;
- struct list_head files; /* goes through sysfs_open_file.list */
+ struct list_head files; /* goes through kernfs_open_file.list */
};
-static struct sysfs_open_file *sysfs_of(struct file *file)
+static struct kernfs_open_file *kernfs_of(struct file *file)
{
return ((struct seq_file *)file->private_data)->private;
}
/*
- * Determine the kernfs_ops for the given sysfs_dirent. This function must
+ * Determine the kernfs_ops for the given kernfs_node. This function must
* be called while holding an active reference.
*/
-static const struct kernfs_ops *kernfs_ops(struct sysfs_dirent *sd)
+static const struct kernfs_ops *kernfs_ops(struct kernfs_node *kn)
{
- if (sd->s_flags & SYSFS_FLAG_LOCKDEP)
- lockdep_assert_held(sd);
- return sd->s_attr.ops;
+ if (kn->flags & KERNFS_LOCKDEP)
+ lockdep_assert_held(kn);
+ return kn->attr.ops;
+}
+
+/*
+ * As kernfs_seq_stop() is also called after kernfs_seq_start() or
+ * kernfs_seq_next() failure, it needs to distinguish whether it's stopping
+ * a seq_file iteration which is fully initialized with an active reference
+ * or an aborted kernfs_seq_start() due to get_active failure. The
+ * position pointer is the only context for each seq_file iteration and
+ * thus the stop condition should be encoded in it. As the return value is
+ * directly visible to userland, ERR_PTR(-ENODEV) is the only acceptable
+ * choice to indicate get_active failure.
+ *
+ * Unfortunately, this is complicated due to the optional custom seq_file
+ * operations which may return ERR_PTR(-ENODEV) too. kernfs_seq_stop()
+ * can't distinguish whether ERR_PTR(-ENODEV) is from get_active failure or
+ * custom seq_file operations and thus can't decide whether put_active
+ * should be performed or not only on ERR_PTR(-ENODEV).
+ *
+ * This is worked around by factoring out the custom seq_stop() and
+ * put_active part into kernfs_seq_stop_active(), skipping it from
+ * kernfs_seq_stop() if ERR_PTR(-ENODEV) while invoking it directly after
+ * custom seq_file operations fail with ERR_PTR(-ENODEV) - this ensures
+ * that kernfs_seq_stop_active() is skipped only after get_active failure.
+ */
+static void kernfs_seq_stop_active(struct seq_file *sf, void *v)
+{
+ struct kernfs_open_file *of = sf->private;
+ const struct kernfs_ops *ops = kernfs_ops(of->kn);
+
+ if (ops->seq_stop)
+ ops->seq_stop(sf, v);
+ kernfs_put_active(of->kn);
}
static void *kernfs_seq_start(struct seq_file *sf, loff_t *ppos)
{
- struct sysfs_open_file *of = sf->private;
+ struct kernfs_open_file *of = sf->private;
const struct kernfs_ops *ops;
/*
* the ops aren't called concurrently for the same open file.
*/
mutex_lock(&of->mutex);
- if (!sysfs_get_active(of->sd))
+ if (!kernfs_get_active(of->kn))
return ERR_PTR(-ENODEV);
- ops = kernfs_ops(of->sd);
+ ops = kernfs_ops(of->kn);
if (ops->seq_start) {
- return ops->seq_start(sf, ppos);
+ void *next = ops->seq_start(sf, ppos);
+ /* see the comment above kernfs_seq_stop_active() */
+ if (next == ERR_PTR(-ENODEV))
+ kernfs_seq_stop_active(sf, next);
+ return next;
} else {
/*
* The same behavior and code as single_open(). Returns
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);
+ struct kernfs_open_file *of = sf->private;
+ const struct kernfs_ops *ops = kernfs_ops(of->kn);
if (ops->seq_next) {
- return ops->seq_next(sf, v, ppos);
+ void *next = ops->seq_next(sf, v, ppos);
+ /* see the comment above kernfs_seq_stop_active() */
+ if (next == ERR_PTR(-ENODEV))
+ kernfs_seq_stop_active(sf, next);
+ return next;
} else {
/*
* The same behavior and code as single_open(), always
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);
+ struct kernfs_open_file *of = sf->private;
- sysfs_put_active(of->sd);
+ if (v != ERR_PTR(-ENODEV))
+ kernfs_seq_stop_active(sf, v);
mutex_unlock(&of->mutex);
}
static int kernfs_seq_show(struct seq_file *sf, void *v)
{
- struct sysfs_open_file *of = sf->private;
+ struct kernfs_open_file *of = sf->private;
- of->event = atomic_read(&of->sd->s_attr.open->event);
+ of->event = atomic_read(&of->kn->attr.open->event);
- return of->sd->s_attr.ops->seq_show(sf, v);
+ return of->kn->attr.ops->seq_show(sf, v);
}
static const struct seq_operations kernfs_seq_ops = {
* 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,
+static ssize_t kernfs_file_direct_read(struct kernfs_open_file *of,
char __user *user_buf, size_t count,
loff_t *ppos)
{
* the ops aren't called concurrently for the same open file.
*/
mutex_lock(&of->mutex);
- if (!sysfs_get_active(of->sd)) {
+ if (!kernfs_get_active(of->kn)) {
len = -ENODEV;
mutex_unlock(&of->mutex);
goto out_free;
}
- ops = kernfs_ops(of->sd);
+ ops = kernfs_ops(of->kn);
if (ops->read)
len = ops->read(of, buf, len, *ppos);
else
len = -EINVAL;
- sysfs_put_active(of->sd);
+ kernfs_put_active(of->kn);
mutex_unlock(&of->mutex);
if (len < 0)
}
/**
- * kernfs_file_read - kernfs vfs read callback
+ * kernfs_fop_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)
+static ssize_t kernfs_fop_read(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
{
- struct sysfs_open_file *of = sysfs_of(file);
+ struct kernfs_open_file *of = kernfs_of(file);
- if (of->sd->s_flags & SYSFS_FLAG_HAS_SEQ_SHOW)
+ if (of->kn->flags & KERNFS_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
+ * kernfs_fop_write - kernfs vfs write callback
* @file: file pointer
* @user_buf: data to write
* @count: number of bytes
* 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)
+static ssize_t kernfs_fop_write(struct file *file, const char __user *user_buf,
+ size_t count, loff_t *ppos)
{
- struct sysfs_open_file *of = sysfs_of(file);
+ struct kernfs_open_file *of = kernfs_of(file);
ssize_t len = min_t(size_t, count, PAGE_SIZE);
const struct kernfs_ops *ops;
char *buf;
* the ops aren't called concurrently for the same open file.
*/
mutex_lock(&of->mutex);
- if (!sysfs_get_active(of->sd)) {
+ if (!kernfs_get_active(of->kn)) {
mutex_unlock(&of->mutex);
len = -ENODEV;
goto out_free;
}
- ops = kernfs_ops(of->sd);
+ ops = kernfs_ops(of->kn);
if (ops->write)
len = ops->write(of, buf, len, *ppos);
else
len = -EINVAL;
- sysfs_put_active(of->sd);
+ kernfs_put_active(of->kn);
mutex_unlock(&of->mutex);
if (len > 0)
static void kernfs_vma_open(struct vm_area_struct *vma)
{
struct file *file = vma->vm_file;
- struct sysfs_open_file *of = sysfs_of(file);
+ struct kernfs_open_file *of = kernfs_of(file);
if (!of->vm_ops)
return;
- if (!sysfs_get_active(of->sd))
+ if (!kernfs_get_active(of->kn))
return;
if (of->vm_ops->open)
of->vm_ops->open(vma);
- sysfs_put_active(of->sd);
+ kernfs_put_active(of->kn);
}
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);
+ struct kernfs_open_file *of = kernfs_of(file);
int ret;
if (!of->vm_ops)
return VM_FAULT_SIGBUS;
- if (!sysfs_get_active(of->sd))
+ if (!kernfs_get_active(of->kn))
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);
+ kernfs_put_active(of->kn);
return ret;
}
struct vm_fault *vmf)
{
struct file *file = vma->vm_file;
- struct sysfs_open_file *of = sysfs_of(file);
+ struct kernfs_open_file *of = kernfs_of(file);
int ret;
if (!of->vm_ops)
return VM_FAULT_SIGBUS;
- if (!sysfs_get_active(of->sd))
+ if (!kernfs_get_active(of->kn))
return VM_FAULT_SIGBUS;
ret = 0;
else
file_update_time(file);
- sysfs_put_active(of->sd);
+ kernfs_put_active(of->kn);
return ret;
}
void *buf, int len, int write)
{
struct file *file = vma->vm_file;
- struct sysfs_open_file *of = sysfs_of(file);
+ struct kernfs_open_file *of = kernfs_of(file);
int ret;
if (!of->vm_ops)
return -EINVAL;
- if (!sysfs_get_active(of->sd))
+ if (!kernfs_get_active(of->kn))
return -EINVAL;
ret = -EINVAL;
if (of->vm_ops->access)
ret = of->vm_ops->access(vma, addr, buf, len, write);
- sysfs_put_active(of->sd);
+ kernfs_put_active(of->kn);
return ret;
}
struct mempolicy *new)
{
struct file *file = vma->vm_file;
- struct sysfs_open_file *of = sysfs_of(file);
+ struct kernfs_open_file *of = kernfs_of(file);
int ret;
if (!of->vm_ops)
return 0;
- if (!sysfs_get_active(of->sd))
+ if (!kernfs_get_active(of->kn))
return -EINVAL;
ret = 0;
if (of->vm_ops->set_policy)
ret = of->vm_ops->set_policy(vma, new);
- sysfs_put_active(of->sd);
+ kernfs_put_active(of->kn);
return ret;
}
unsigned long addr)
{
struct file *file = vma->vm_file;
- struct sysfs_open_file *of = sysfs_of(file);
+ struct kernfs_open_file *of = kernfs_of(file);
struct mempolicy *pol;
if (!of->vm_ops)
return vma->vm_policy;
- if (!sysfs_get_active(of->sd))
+ if (!kernfs_get_active(of->kn))
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);
+ kernfs_put_active(of->kn);
return pol;
}
unsigned long flags)
{
struct file *file = vma->vm_file;
- struct sysfs_open_file *of = sysfs_of(file);
+ struct kernfs_open_file *of = kernfs_of(file);
int ret;
if (!of->vm_ops)
return 0;
- if (!sysfs_get_active(of->sd))
+ if (!kernfs_get_active(of->kn))
return 0;
ret = 0;
if (of->vm_ops->migrate)
ret = of->vm_ops->migrate(vma, from, to, flags);
- sysfs_put_active(of->sd);
+ kernfs_put_active(of->kn);
return ret;
}
#endif
#endif
};
-static int kernfs_file_mmap(struct file *file, struct vm_area_struct *vma)
+static int kernfs_fop_mmap(struct file *file, struct vm_area_struct *vma)
{
- struct sysfs_open_file *of = sysfs_of(file);
+ struct kernfs_open_file *of = kernfs_of(file);
const struct kernfs_ops *ops;
int rc;
+ /*
+ * mmap path and of->mutex are prone to triggering spurious lockdep
+ * warnings and we don't want to add spurious locking dependency
+ * between the two. Check whether mmap is actually implemented
+ * without grabbing @of->mutex by testing HAS_MMAP flag. See the
+ * comment in kernfs_file_open() for more details.
+ */
+ if (!(of->kn->flags & KERNFS_HAS_MMAP))
+ return -ENODEV;
+
mutex_lock(&of->mutex);
rc = -ENODEV;
- if (!sysfs_get_active(of->sd))
+ if (!kernfs_get_active(of->kn))
goto out_unlock;
- ops = kernfs_ops(of->sd);
- if (ops->mmap)
- rc = ops->mmap(of, vma);
- if (rc)
- goto out_put;
+ ops = kernfs_ops(of->kn);
+ rc = ops->mmap(of, vma);
/*
* PowerPC's pci_mmap of legacy_mem uses shmem_zero_setup()
of->vm_ops = vma->vm_ops;
vma->vm_ops = &kernfs_vm_ops;
out_put:
- sysfs_put_active(of->sd);
+ kernfs_put_active(of->kn);
out_unlock:
mutex_unlock(&of->mutex);
}
/**
- * sysfs_get_open_dirent - get or create sysfs_open_dirent
- * @sd: target sysfs_dirent
- * @of: sysfs_open_file for this instance of open
+ * kernfs_get_open_node - get or create kernfs_open_node
+ * @kn: target kernfs_node
+ * @of: kernfs_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.
+ * If @kn->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)
+static int kernfs_get_open_node(struct kernfs_node *kn,
+ struct kernfs_open_file *of)
{
- struct sysfs_open_dirent *od, *new_od = NULL;
+ struct kernfs_open_node *on, *new_on = NULL;
retry:
- mutex_lock(&sysfs_open_file_mutex);
- spin_lock_irq(&sysfs_open_dirent_lock);
+ mutex_lock(&kernfs_open_file_mutex);
+ spin_lock_irq(&kernfs_open_node_lock);
- if (!sd->s_attr.open && new_od) {
- sd->s_attr.open = new_od;
- new_od = NULL;
+ if (!kn->attr.open && new_on) {
+ kn->attr.open = new_on;
+ new_on = NULL;
}
- od = sd->s_attr.open;
- if (od) {
- atomic_inc(&od->refcnt);
- list_add_tail(&of->list, &od->files);
+ on = kn->attr.open;
+ if (on) {
+ atomic_inc(&on->refcnt);
+ list_add_tail(&of->list, &on->files);
}
- spin_unlock_irq(&sysfs_open_dirent_lock);
- mutex_unlock(&sysfs_open_file_mutex);
+ spin_unlock_irq(&kernfs_open_node_lock);
+ mutex_unlock(&kernfs_open_file_mutex);
- if (od) {
- kfree(new_od);
+ if (on) {
+ kfree(new_on);
return 0;
}
/* not there, initialize a new one and retry */
- new_od = kmalloc(sizeof(*new_od), GFP_KERNEL);
- if (!new_od)
+ new_on = kmalloc(sizeof(*new_on), GFP_KERNEL);
+ if (!new_on)
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);
+ atomic_set(&new_on->refcnt, 0);
+ atomic_set(&new_on->event, 1);
+ init_waitqueue_head(&new_on->poll);
+ INIT_LIST_HEAD(&new_on->files);
goto retry;
}
/**
- * sysfs_put_open_dirent - put sysfs_open_dirent
- * @sd: target sysfs_dirent
- * @of: associated sysfs_open_file
+ * kernfs_put_open_node - put kernfs_open_node
+ * @kn: target kernfs_nodet
+ * @of: associated kernfs_open_file
*
- * Put @sd->s_attr.open and unlink @of from the files list. If
+ * Put @kn->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)
+static void kernfs_put_open_node(struct kernfs_node *kn,
+ struct kernfs_open_file *of)
{
- struct sysfs_open_dirent *od = sd->s_attr.open;
+ struct kernfs_open_node *on = kn->attr.open;
unsigned long flags;
- mutex_lock(&sysfs_open_file_mutex);
- spin_lock_irqsave(&sysfs_open_dirent_lock, flags);
+ mutex_lock(&kernfs_open_file_mutex);
+ spin_lock_irqsave(&kernfs_open_node_lock, flags);
if (of)
list_del(&of->list);
- if (atomic_dec_and_test(&od->refcnt))
- sd->s_attr.open = NULL;
+ if (atomic_dec_and_test(&on->refcnt))
+ kn->attr.open = NULL;
else
- od = NULL;
+ on = NULL;
- spin_unlock_irqrestore(&sysfs_open_dirent_lock, flags);
- mutex_unlock(&sysfs_open_file_mutex);
+ spin_unlock_irqrestore(&kernfs_open_node_lock, flags);
+ mutex_unlock(&kernfs_open_file_mutex);
- kfree(od);
+ kfree(on);
}
-static int kernfs_file_open(struct inode *inode, struct file *file)
+static int kernfs_fop_open(struct inode *inode, struct file *file)
{
- struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+ struct kernfs_node *kn = file->f_path.dentry->d_fsdata;
const struct kernfs_ops *ops;
- struct sysfs_open_file *of;
+ struct kernfs_open_file *of;
bool has_read, has_write, has_mmap;
int error = -EACCES;
- if (!sysfs_get_active(attr_sd))
+ if (!kernfs_get_active(kn))
return -ENODEV;
- ops = kernfs_ops(attr_sd);
+ ops = kernfs_ops(kn);
has_read = ops->seq_show || ops->read || ops->mmap;
has_write = ops->write || ops->mmap;
(!(inode->i_mode & S_IRUGO) || !has_read))
goto err_out;
- /* allocate a sysfs_open_file for the file */
+ /* allocate a kernfs_open_file for the file */
error = -ENOMEM;
- of = kzalloc(sizeof(struct sysfs_open_file), GFP_KERNEL);
+ of = kzalloc(sizeof(struct kernfs_open_file), GFP_KERNEL);
if (!of)
goto err_out;
* 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.
+ *
+ * Both paths of the branch look the same. They're supposed to
+ * look that way and give @of->mutex different static lockdep keys.
*/
if (has_mmap)
mutex_init(&of->mutex);
else
mutex_init(&of->mutex);
- of->sd = attr_sd;
+ of->kn = kn;
of->file = file;
/*
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);
+ /* make sure we have open node struct */
+ error = kernfs_get_open_node(kn, of);
if (error)
goto err_close;
/* open succeeded, put active references */
- sysfs_put_active(attr_sd);
+ kernfs_put_active(kn);
return 0;
err_close:
err_free:
kfree(of);
err_out:
- sysfs_put_active(attr_sd);
+ kernfs_put_active(kn);
return error;
}
-static int kernfs_file_release(struct inode *inode, struct file *filp)
+static int kernfs_fop_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);
+ struct kernfs_node *kn = filp->f_path.dentry->d_fsdata;
+ struct kernfs_open_file *of = kernfs_of(filp);
- sysfs_put_open_dirent(sd, of);
+ kernfs_put_open_node(kn, of);
seq_release(inode, filp);
kfree(of);
return 0;
}
-void sysfs_unmap_bin_file(struct sysfs_dirent *sd)
+void kernfs_unmap_bin_file(struct kernfs_node *kn)
{
- struct sysfs_open_dirent *od;
- struct sysfs_open_file *of;
+ struct kernfs_open_node *on;
+ struct kernfs_open_file *of;
- if (!(sd->s_flags & SYSFS_FLAG_HAS_MMAP))
+ if (!(kn->flags & KERNFS_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)
+ spin_lock_irq(&kernfs_open_node_lock);
+ on = kn->attr.open;
+ if (on)
+ atomic_inc(&on->refcnt);
+ spin_unlock_irq(&kernfs_open_node_lock);
+ if (!on)
return;
- mutex_lock(&sysfs_open_file_mutex);
- list_for_each_entry(of, &od->files, list) {
+ mutex_lock(&kernfs_open_file_mutex);
+ list_for_each_entry(of, &on->files, list) {
struct inode *inode = file_inode(of->file);
unmap_mapping_range(inode->i_mapping, 0, 0, 1);
}
- mutex_unlock(&sysfs_open_file_mutex);
+ mutex_unlock(&kernfs_open_file_mutex);
- sysfs_put_open_dirent(sd, NULL);
+ kernfs_put_open_node(kn, NULL);
}
-/* Sysfs attribute files are pollable. The idea is that you read
+/*
+ * Kernfs 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
* 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)
+static unsigned int kernfs_fop_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;
+ struct kernfs_open_file *of = kernfs_of(filp);
+ struct kernfs_node *kn = filp->f_path.dentry->d_fsdata;
+ struct kernfs_open_node *on = kn->attr.open;
/* need parent for the kobj, grab both */
- if (!sysfs_get_active(attr_sd))
+ if (!kernfs_get_active(kn))
goto trigger;
- poll_wait(filp, &od->poll, wait);
+ poll_wait(filp, &on->poll, wait);
- sysfs_put_active(attr_sd);
+ kernfs_put_active(kn);
- if (of->event != atomic_read(&od->event))
+ if (of->event != atomic_read(&on->event))
goto trigger;
return DEFAULT_POLLMASK;
/**
* kernfs_notify - notify a kernfs file
- * @sd: file to notify
+ * @kn: file to notify
*
- * Notify @sd such that poll(2) on @sd wakes up.
+ * Notify @kn such that poll(2) on @kn wakes up.
*/
-void kernfs_notify(struct sysfs_dirent *sd)
+void kernfs_notify(struct kernfs_node *kn)
{
- struct sysfs_open_dirent *od;
+ struct kernfs_open_node *on;
unsigned long flags;
- spin_lock_irqsave(&sysfs_open_dirent_lock, flags);
+ spin_lock_irqsave(&kernfs_open_node_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);
+ if (!WARN_ON(kernfs_type(kn) != KERNFS_FILE)) {
+ on = kn->attr.open;
+ if (on) {
+ atomic_inc(&on->event);
+ wake_up_interruptible(&on->poll);
}
}
- spin_unlock_irqrestore(&sysfs_open_dirent_lock, flags);
+ spin_unlock_irqrestore(&kernfs_open_node_lock, flags);
}
EXPORT_SYMBOL_GPL(kernfs_notify);
-const struct file_operations kernfs_file_operations = {
- .read = kernfs_file_read,
- .write = kernfs_file_write,
+const struct file_operations kernfs_file_fops = {
+ .read = kernfs_fop_read,
+ .write = kernfs_fop_write,
.llseek = generic_file_llseek,
- .mmap = kernfs_file_mmap,
- .open = kernfs_file_open,
- .release = kernfs_file_release,
- .poll = kernfs_file_poll,
+ .mmap = kernfs_fop_mmap,
+ .open = kernfs_fop_open,
+ .release = kernfs_fop_release,
+ .poll = kernfs_fop_poll,
};
/**
- * kernfs_create_file_ns_key - create a file
+ * __kernfs_create_file - kernfs internal function to create a file
* @parent: directory to create the file in
* @name: name of the file
* @mode: mode of the file
* @ops: kernfs operations for the file
* @priv: private data for the file
* @ns: optional namespace tag of the file
+ * @static_name: don't copy file name
* @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 kernfs_node *__kernfs_create_file(struct kernfs_node *parent,
+ const char *name,
+ umode_t mode, loff_t size,
+ const struct kernfs_ops *ops,
+ void *priv, const void *ns,
+ bool name_is_static,
+ struct lock_class_key *key)
{
- struct sysfs_addrm_cxt acxt;
- struct sysfs_dirent *sd;
+ struct kernfs_addrm_cxt acxt;
+ struct kernfs_node *kn;
+ unsigned flags;
int rc;
- sd = sysfs_new_dirent(kernfs_root(parent), name,
- (mode & S_IALLUGO) | S_IFREG, SYSFS_KOBJ_ATTR);
- if (!sd)
+ flags = KERNFS_FILE;
+ if (name_is_static)
+ flags |= KERNFS_STATIC_NAME;
+
+ kn = kernfs_new_node(kernfs_root(parent), name,
+ (mode & S_IALLUGO) | S_IFREG, flags);
+ if (!kn)
return ERR_PTR(-ENOMEM);
- sd->s_attr.ops = ops;
- sd->s_attr.size = size;
- sd->s_ns = ns;
- sd->priv = priv;
+ kn->attr.ops = ops;
+ kn->attr.size = size;
+ kn->ns = ns;
+ kn->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;
+ lockdep_init_map(&kn->dep_map, "s_active", key, 0);
+ kn->flags |= KERNFS_LOCKDEP;
}
#endif
/*
- * sd->s_attr.ops is accesible only while holding active ref. We
+ * kn->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;
+ kn->flags |= KERNFS_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);
+ kn->flags |= KERNFS_HAS_MMAP;
+
+ rc = -ENOENT;
+ if (kernfs_get_active(parent)) {
+ kernfs_addrm_start(&acxt);
+ rc = kernfs_add_one(&acxt, kn, parent);
+ kernfs_addrm_finish(&acxt);
+ kernfs_put_active(parent);
+ }
if (rc) {
- kernfs_put(sd);
+ kernfs_put(kn);
return ERR_PTR(rc);
}
- return sd;
+ return kn;
}
projects / deliverable / linux.git / blobdiff