}
/*
+ * 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 (!sysfs_ignore_lockdep(sd))
+ lockdep_assert_held(sd);
+ return sd->s_attr.ops;
+}
+
+/*
* Determine ktype->sysfs_ops for the given sysfs_dirent. This function
* must be called while holding an active reference.
*/
of->event = atomic_read(&of->sd->s_attr.open->event);
- return sysfs_kf_seq_show(sf, v);
+ return of->sd->s_attr.ops->seq_show(sf, v);
}
static const struct seq_operations kernfs_seq_ops = {
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);
goto out_free;
}
- len = sysfs_kf_bin_read(of, buf, len, *ppos);
+ 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);
{
struct sysfs_open_file *of = sysfs_of(file);
- if (sysfs_is_bin(of->sd))
- return kernfs_file_direct_read(of, user_buf, count, ppos);
- else
+ 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 */
{
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);
goto out_free;
}
- if (sysfs_is_bin(of->sd))
- len = sysfs_kf_bin_write(of, buf, len, *ppos);
+ ops = kernfs_ops(of->sd);
+ if (ops->write)
+ len = ops->write(of, buf, len, *ppos);
else
- len = sysfs_kf_write(of, buf, len, *ppos);
+ len = -EINVAL;
sysfs_put_active(of->sd);
mutex_unlock(&of->mutex);
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);
if (!sysfs_get_active(of->sd))
goto out_unlock;
- if (sysfs_is_bin(of->sd))
- rc = sysfs_kf_bin_mmap(of, vma);
+ ops = kernfs_ops(of->sd);
+ if (ops->mmap)
+ rc = ops->mmap(of, vma);
if (rc)
goto out_put;
static int kernfs_file_open(struct inode *inode, struct file *file)
{
struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
- struct kobject *kobj = attr_sd->s_parent->priv;
+ const struct kernfs_ops *ops;
struct sysfs_open_file *of;
bool has_read, has_write, has_mmap;
int error = -EACCES;
- /* need attr_sd for attr and ops, its parent for kobj */
if (!sysfs_get_active(attr_sd))
return -ENODEV;
- if (sysfs_is_bin(attr_sd)) {
- struct bin_attribute *battr = attr_sd->priv;
+ ops = kernfs_ops(attr_sd);
- has_read = battr->read || battr->mmap;
- has_write = battr->write || battr->mmap;
- has_mmap = battr->mmap;
- } else {
- const struct sysfs_ops *ops = sysfs_file_ops(attr_sd);
-
- /* every kobject with an attribute needs a ktype assigned */
- if (WARN(!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;
- has_mmap = false;
- }
+ 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) &&
* 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 = seq_open(file, NULL);
- else
+ if (ops->seq_show)
error = seq_open(file, &kernfs_seq_ops);
+ else
+ error = seq_open(file, NULL);
if (error)
goto err_free;
struct sysfs_open_dirent *od;
struct sysfs_open_file *of;
- if (!sysfs_is_bin(sd))
+ if (!(sd->s_flags & SYSFS_FLAG_HAS_MMAP))
return;
spin_lock_irq(&sysfs_open_dirent_lock);
.poll = kernfs_file_poll,
};
+static const struct kernfs_ops sysfs_file_kfops_empty = {
+};
+
+static const struct kernfs_ops sysfs_file_kfops_ro = {
+ .seq_show = sysfs_kf_seq_show,
+};
+
+static const struct kernfs_ops sysfs_file_kfops_wo = {
+ .write = sysfs_kf_write,
+};
+
+static const struct kernfs_ops sysfs_file_kfops_rw = {
+ .seq_show = sysfs_kf_seq_show,
+ .write = sysfs_kf_write,
+};
+
+static const struct kernfs_ops sysfs_bin_kfops_ro = {
+ .read = sysfs_kf_bin_read,
+};
+
+static const struct kernfs_ops sysfs_bin_kfops_wo = {
+ .write = sysfs_kf_bin_write,
+};
+
+static const struct kernfs_ops sysfs_bin_kfops_rw = {
+ .read = sysfs_kf_bin_read,
+ .write = sysfs_kf_bin_write,
+ .mmap = sysfs_kf_bin_mmap,
+};
+
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;
+ const struct kernfs_ops *ops;
struct sysfs_addrm_cxt acxt;
struct sysfs_dirent *sd;
int rc;
+ if (type == SYSFS_KOBJ_ATTR) {
+ struct kobject *kobj = dir_sd->priv;
+ const struct sysfs_ops *sysfs_ops = kobj->ktype->sysfs_ops;
+
+ /* every kobject with an attribute needs a ktype assigned */
+ if (WARN(!sysfs_ops, KERN_ERR
+ "missing sysfs attribute operations for kobject: %s\n",
+ kobject_name(kobj)))
+ 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;
+ } else {
+ struct bin_attribute *battr = (void *)attr;
+
+ if ((battr->read && battr->write) || battr->mmap)
+ 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;
+ }
+
sd = sysfs_new_dirent(attr->name, mode, type);
if (!sd)
return -ENOMEM;
+ sd->s_attr.ops = ops;
sd->s_ns = ns;
sd->priv = (void *)attr;
sysfs_dirent_init_lockdep(sd);
+ /*
+ * 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, dir_sd);
sysfs_addrm_finish(&acxt);
projects / platform / adaptation / renesas_rcar / renesas_kernel.git / blobdiff