X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Fsysfs%2Fbin.c;h=e9d293593e52f79bc51bef2bbc352898b9bdd1ee;hb=ea1409f96197c1bffe5d7d5bc967b3445edcc1fa;hp=8ea2a51ce883aa8ed73cf6bb8df7d7ed36cc9232;hpb=45cd8d8e1e56fba41b1e4fae988f40fe938045c2;p=safe%2Fjmp%2Flinux-2.6

diff --git a/fs/sysfs/bin.c b/fs/sysfs/bin.c
index 8ea2a51..e9d2935 100644
--- a/fs/sysfs/bin.c
+++ b/fs/sysfs/bin.c
@@ -1,9 +1,15 @@
 /*
- * bin.c - binary file operations for sysfs.
+ * fs/sysfs/bin.c - sysfs binary file implementation
  *
  * Copyright (c) 2003 Patrick Mochel
  * Copyright (c) 2003 Matthew Wilcox
  * Copyright (c) 2004 Silicon Graphics, Inc.
+ * Copyright (c) 2007 SUSE Linux Products GmbH
+ * Copyright (c) 2007 Tejun Heo <teheo@suse.de>
+ *
+ * This file is released under the GPLv2.
+ *
+ * Please see Documentation/filesystems/sysfs.txt for more information.
  */
 
 #undef DEBUG
@@ -14,35 +20,64 @@
 #include <linux/kobject.h>
 #include <linux/module.h>
 #include <linux/slab.h>
+#include <linux/mutex.h>
+#include <linux/mm.h>
 
 #include <asm/uaccess.h>
-#include <asm/semaphore.h>
 
 #include "sysfs.h"
 
+/*
+ * There's one bin_buffer for each open file.
+ *
+ * filp->private_data points to bin_buffer and
+ * sysfs_dirent->s_bin_attr.buffers points to a the bin_buffer s
+ * sysfs_dirent->s_bin_attr.buffers is protected by sysfs_bin_lock
+ */
+static DEFINE_MUTEX(sysfs_bin_lock);
+
+struct bin_buffer {
+	struct mutex			mutex;
+	void				*buffer;
+	int				mmapped;
+	const struct vm_operations_struct *vm_ops;
+	struct file			*file;
+	struct hlist_node		list;
+};
+
 static int
 fill_read(struct dentry *dentry, char *buffer, loff_t off, size_t count)
 {
-	struct bin_attribute * attr = to_bin_attr(dentry);
-	struct kobject * kobj = to_kobj(dentry->d_parent);
+	struct sysfs_dirent *attr_sd = dentry->d_fsdata;
+	struct bin_attribute *attr = attr_sd->s_bin_attr.bin_attr;
+	struct kobject *kobj = attr_sd->s_parent->s_dir.kobj;
+	int rc;
+
+	/* need attr_sd for attr, its parent for kobj */
+	if (!sysfs_get_active(attr_sd))
+		return -ENODEV;
 
-	if (!attr->read)
-		return -EIO;
+	rc = -EIO;
+	if (attr->read)
+		rc = attr->read(kobj, attr, buffer, off, count);
 
-	return attr->read(kobj, buffer, off, count);
+	sysfs_put_active(attr_sd);
+
+	return rc;
 }
 
 static ssize_t
-read(struct file * file, char __user * userbuf, size_t count, loff_t * off)
+read(struct file *file, char __user *userbuf, size_t bytes, loff_t *off)
 {
-	char *buffer = file->private_data;
+	struct bin_buffer *bb = file->private_data;
 	struct dentry *dentry = file->f_path.dentry;
 	int size = dentry->d_inode->i_size;
 	loff_t offs = *off;
-	int ret;
+	int count = min_t(size_t, bytes, PAGE_SIZE);
+	char *temp;
 
-	if (count > PAGE_SIZE)
-		count = PAGE_SIZE;
+	if (!bytes)
+		return 0;
 
 	if (size) {
 		if (offs > size)
@@ -51,43 +86,70 @@ read(struct file * file, char __user * userbuf, size_t count, loff_t * off)
 			count = size - offs;
 	}
 
-	ret = fill_read(dentry, buffer, offs, count);
-	if (ret < 0) 
-		return ret;
-	count = ret;
+	temp = kmalloc(count, GFP_KERNEL);
+	if (!temp)
+		return -ENOMEM;
 
-	if (copy_to_user(userbuf, buffer, count))
-		return -EFAULT;
+	mutex_lock(&bb->mutex);
+
+	count = fill_read(dentry, bb->buffer, offs, count);
+	if (count < 0) {
+		mutex_unlock(&bb->mutex);
+		goto out_free;
+	}
+
+	memcpy(temp, bb->buffer, count);
+
+	mutex_unlock(&bb->mutex);
+
+	if (copy_to_user(userbuf, temp, count)) {
+		count = -EFAULT;
+		goto out_free;
+	}
 
 	pr_debug("offs = %lld, *off = %lld, count = %d\n", offs, *off, count);
 
 	*off = offs + count;
 
+ out_free:
+	kfree(temp);
 	return count;
 }
 
 static int
 flush_write(struct dentry *dentry, char *buffer, loff_t offset, size_t count)
 {
-	struct bin_attribute *attr = to_bin_attr(dentry);
-	struct kobject *kobj = to_kobj(dentry->d_parent);
+	struct sysfs_dirent *attr_sd = dentry->d_fsdata;
+	struct bin_attribute *attr = attr_sd->s_bin_attr.bin_attr;
+	struct kobject *kobj = attr_sd->s_parent->s_dir.kobj;
+	int rc;
+
+	/* need attr_sd for attr, its parent for kobj */
+	if (!sysfs_get_active(attr_sd))
+		return -ENODEV;
 
-	if (!attr->write)
-		return -EIO;
+	rc = -EIO;
+	if (attr->write)
+		rc = attr->write(kobj, attr, buffer, offset, count);
 
-	return attr->write(kobj, buffer, offset, count);
+	sysfs_put_active(attr_sd);
+
+	return rc;
 }
 
-static ssize_t write(struct file * file, const char __user * userbuf,
-		     size_t count, loff_t * off)
+static ssize_t write(struct file *file, const char __user *userbuf,
+		     size_t bytes, loff_t *off)
 {
-	char *buffer = file->private_data;
+	struct bin_buffer *bb = file->private_data;
 	struct dentry *dentry = file->f_path.dentry;
 	int size = dentry->d_inode->i_size;
 	loff_t offs = *off;
+	int count = min_t(size_t, bytes, PAGE_SIZE);
+	char *temp;
+
+	if (!bytes)
+		return 0;
 
-	if (count > PAGE_SIZE)
-		count = PAGE_SIZE;
 	if (size) {
 		if (offs > size)
 			return 0;
@@ -95,72 +157,294 @@ static ssize_t write(struct file * file, const char __user * userbuf,
 			count = size - offs;
 	}
 
-	if (copy_from_user(buffer, userbuf, count))
-		return -EFAULT;
+	temp = memdup_user(userbuf, count);
+	if (IS_ERR(temp))
+		return PTR_ERR(temp);
+
+	mutex_lock(&bb->mutex);
+
+	memcpy(bb->buffer, temp, count);
+
+	count = flush_write(dentry, bb->buffer, offs, count);
+	mutex_unlock(&bb->mutex);
 
-	count = flush_write(dentry, buffer, offs, count);
 	if (count > 0)
 		*off = offs + count;
+
+	kfree(temp);
 	return count;
 }
 
-static int mmap(struct file *file, struct vm_area_struct *vma)
+static void bin_vma_open(struct vm_area_struct *vma)
 {
-	struct dentry *dentry = file->f_path.dentry;
-	struct bin_attribute *attr = to_bin_attr(dentry);
-	struct kobject *kobj = to_kobj(dentry->d_parent);
+	struct file *file = vma->vm_file;
+	struct bin_buffer *bb = file->private_data;
+	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
 
-	if (!attr->mmap)
+	if (!bb->vm_ops || !bb->vm_ops->open)
+		return;
+
+	if (!sysfs_get_active(attr_sd))
+		return;
+
+	bb->vm_ops->open(vma);
+
+	sysfs_put_active(attr_sd);
+}
+
+static void bin_vma_close(struct vm_area_struct *vma)
+{
+	struct file *file = vma->vm_file;
+	struct bin_buffer *bb = file->private_data;
+	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+
+	if (!bb->vm_ops || !bb->vm_ops->close)
+		return;
+
+	if (!sysfs_get_active(attr_sd))
+		return;
+
+	bb->vm_ops->close(vma);
+
+	sysfs_put_active(attr_sd);
+}
+
+static int bin_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+	struct file *file = vma->vm_file;
+	struct bin_buffer *bb = file->private_data;
+	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+	int ret;
+
+	if (!bb->vm_ops || !bb->vm_ops->fault)
+		return VM_FAULT_SIGBUS;
+
+	if (!sysfs_get_active(attr_sd))
+		return VM_FAULT_SIGBUS;
+
+	ret = bb->vm_ops->fault(vma, vmf);
+
+	sysfs_put_active(attr_sd);
+	return ret;
+}
+
+static int bin_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+	struct file *file = vma->vm_file;
+	struct bin_buffer *bb = file->private_data;
+	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+	int ret;
+
+	if (!bb->vm_ops)
+		return VM_FAULT_SIGBUS;
+
+	if (!bb->vm_ops->page_mkwrite)
+		return 0;
+
+	if (!sysfs_get_active(attr_sd))
+		return VM_FAULT_SIGBUS;
+
+	ret = bb->vm_ops->page_mkwrite(vma, vmf);
+
+	sysfs_put_active(attr_sd);
+	return ret;
+}
+
+static int bin_access(struct vm_area_struct *vma, unsigned long addr,
+		  void *buf, int len, int write)
+{
+	struct file *file = vma->vm_file;
+	struct bin_buffer *bb = file->private_data;
+	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+	int ret;
+
+	if (!bb->vm_ops || !bb->vm_ops->access)
+		return -EINVAL;
+
+	if (!sysfs_get_active(attr_sd))
 		return -EINVAL;
 
-	return attr->mmap(kobj, attr, vma);
+	ret = bb->vm_ops->access(vma, addr, buf, len, write);
+
+	sysfs_put_active(attr_sd);
+	return ret;
 }
 
-static int open(struct inode * inode, struct file * file)
+#ifdef CONFIG_NUMA
+static int bin_set_policy(struct vm_area_struct *vma, struct mempolicy *new)
+{
+	struct file *file = vma->vm_file;
+	struct bin_buffer *bb = file->private_data;
+	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+	int ret;
+
+	if (!bb->vm_ops || !bb->vm_ops->set_policy)
+		return 0;
+
+	if (!sysfs_get_active(attr_sd))
+		return -EINVAL;
+
+	ret = bb->vm_ops->set_policy(vma, new);
+
+	sysfs_put_active(attr_sd);
+	return ret;
+}
+
+static struct mempolicy *bin_get_policy(struct vm_area_struct *vma,
+					unsigned long addr)
+{
+	struct file *file = vma->vm_file;
+	struct bin_buffer *bb = file->private_data;
+	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+	struct mempolicy *pol;
+
+	if (!bb->vm_ops || !bb->vm_ops->get_policy)
+		return vma->vm_policy;
+
+	if (!sysfs_get_active(attr_sd))
+		return vma->vm_policy;
+
+	pol = bb->vm_ops->get_policy(vma, addr);
+
+	sysfs_put_active(attr_sd);
+	return pol;
+}
+
+static int bin_migrate(struct vm_area_struct *vma, const nodemask_t *from,
+			const nodemask_t *to, unsigned long flags)
+{
+	struct file *file = vma->vm_file;
+	struct bin_buffer *bb = file->private_data;
+	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+	int ret;
+
+	if (!bb->vm_ops || !bb->vm_ops->migrate)
+		return 0;
+
+	if (!sysfs_get_active(attr_sd))
+		return 0;
+
+	ret = bb->vm_ops->migrate(vma, from, to, flags);
+
+	sysfs_put_active(attr_sd);
+	return ret;
+}
+#endif
+
+static const struct vm_operations_struct bin_vm_ops = {
+	.open		= bin_vma_open,
+	.close		= bin_vma_close,
+	.fault		= bin_fault,
+	.page_mkwrite	= bin_page_mkwrite,
+	.access		= bin_access,
+#ifdef CONFIG_NUMA
+	.set_policy	= bin_set_policy,
+	.get_policy	= bin_get_policy,
+	.migrate	= bin_migrate,
+#endif
+};
+
+static int mmap(struct file *file, struct vm_area_struct *vma)
 {
-	struct kobject *kobj = sysfs_get_kobject(file->f_path.dentry->d_parent);
-	struct bin_attribute * attr = to_bin_attr(file->f_path.dentry);
-	int error = -EINVAL;
+	struct bin_buffer *bb = file->private_data;
+	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+	struct bin_attribute *attr = attr_sd->s_bin_attr.bin_attr;
+	struct kobject *kobj = attr_sd->s_parent->s_dir.kobj;
+	int rc;
+
+	mutex_lock(&bb->mutex);
+
+	/* need attr_sd for attr, its parent for kobj */
+	rc = -ENODEV;
+	if (!sysfs_get_active(attr_sd))
+		goto out_unlock;
+
+	rc = -EINVAL;
+	if (!attr->mmap)
+		goto out_put;
+
+	rc = attr->mmap(kobj, attr, 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 (bb->mmapped && bb->vm_ops != vma->vm_ops)
+		goto out_put;
+
+	rc = 0;
+	bb->mmapped = 1;
+	bb->vm_ops = vma->vm_ops;
+	vma->vm_ops = &bin_vm_ops;
+out_put:
+	sysfs_put_active(attr_sd);
+out_unlock:
+	mutex_unlock(&bb->mutex);
+
+	return rc;
+}
 
-	if (!kobj || !attr)
-		goto Done;
+static int open(struct inode * inode, struct file * file)
+{
+	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+	struct bin_attribute *attr = attr_sd->s_bin_attr.bin_attr;
+	struct bin_buffer *bb = NULL;
+	int error;
 
-	/* Grab the module reference for this attribute if we have one */
-	error = -ENODEV;
-	if (!try_module_get(attr->attr.owner)) 
-		goto Done;
+	/* binary file operations requires both @sd and its parent */
+	if (!sysfs_get_active(attr_sd))
+		return -ENODEV;
 
 	error = -EACCES;
 	if ((file->f_mode & FMODE_WRITE) && !(attr->write || attr->mmap))
-		goto Error;
+		goto err_out;
 	if ((file->f_mode & FMODE_READ) && !(attr->read || attr->mmap))
-		goto Error;
+		goto err_out;
 
 	error = -ENOMEM;
-	file->private_data = kmalloc(PAGE_SIZE, GFP_KERNEL);
-	if (!file->private_data)
-		goto Error;
-
-	error = 0;
-    goto Done;
-
- Error:
-	module_put(attr->attr.owner);
- Done:
-	if (error)
-		kobject_put(kobj);
+	bb = kzalloc(sizeof(*bb), GFP_KERNEL);
+	if (!bb)
+		goto err_out;
+
+	bb->buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
+	if (!bb->buffer)
+		goto err_out;
+
+	mutex_init(&bb->mutex);
+	bb->file = file;
+	file->private_data = bb;
+
+	mutex_lock(&sysfs_bin_lock);
+	hlist_add_head(&bb->list, &attr_sd->s_bin_attr.buffers);
+	mutex_unlock(&sysfs_bin_lock);
+
+	/* open succeeded, put active references */
+	sysfs_put_active(attr_sd);
+	return 0;
+
+ err_out:
+	sysfs_put_active(attr_sd);
+	kfree(bb);
 	return error;
 }
 
 static int release(struct inode * inode, struct file * file)
 {
-	struct kobject * kobj = to_kobj(file->f_path.dentry->d_parent);
-	struct bin_attribute * attr = to_bin_attr(file->f_path.dentry);
-	u8 * buffer = file->private_data;
+	struct bin_buffer *bb = file->private_data;
 
-	kobject_put(kobj);
-	module_put(attr->attr.owner);
-	kfree(buffer);
+	mutex_lock(&sysfs_bin_lock);
+	hlist_del(&bb->list);
+	mutex_unlock(&sysfs_bin_lock);
+
+	kfree(bb->buffer);
+	kfree(bb);
 	return 0;
 }
 
@@ -173,17 +457,38 @@ const struct file_operations bin_fops = {
 	.release	= release,
 };
 
+
+void unmap_bin_file(struct sysfs_dirent *attr_sd)
+{
+	struct bin_buffer *bb;
+	struct hlist_node *tmp;
+
+	if (sysfs_type(attr_sd) != SYSFS_KOBJ_BIN_ATTR)
+		return;
+
+	mutex_lock(&sysfs_bin_lock);
+
+	hlist_for_each_entry(bb, tmp, &attr_sd->s_bin_attr.buffers, list) {
+		struct inode *inode = bb->file->f_path.dentry->d_inode;
+
+		unmap_mapping_range(inode->i_mapping, 0, 0, 1);
+	}
+
+	mutex_unlock(&sysfs_bin_lock);
+}
+
 /**
  *	sysfs_create_bin_file - create binary file for object.
  *	@kobj:	object.
  *	@attr:	attribute descriptor.
  */
 
-int sysfs_create_bin_file(struct kobject * kobj, struct bin_attribute * attr)
+int sysfs_create_bin_file(struct kobject *kobj,
+			  const struct bin_attribute *attr)
 {
-	BUG_ON(!kobj || !kobj->dentry || !attr);
+	BUG_ON(!kobj || !kobj->sd || !attr);
 
-	return sysfs_add_file(kobj->dentry, &attr->attr, SYSFS_KOBJ_BIN_ATTR);
+	return sysfs_add_file(kobj->sd, &attr->attr, SYSFS_KOBJ_BIN_ATTR);
 }
 
 
@@ -193,14 +498,10 @@ int sysfs_create_bin_file(struct kobject * kobj, struct bin_attribute * attr)
  *	@attr:	attribute descriptor.
  */
 
-void sysfs_remove_bin_file(struct kobject * kobj, struct bin_attribute * attr)
+void sysfs_remove_bin_file(struct kobject *kobj,
+			   const struct bin_attribute *attr)
 {
-	if (sysfs_hash_and_remove(kobj->dentry, attr->attr.name) < 0) {
-		printk(KERN_ERR "%s: "
-			"bad dentry or inode or no such file: \"%s\"\n",
-			__FUNCTION__, attr->attr.name);
-		dump_stack();
-	}
+	sysfs_hash_and_remove(kobj->sd, attr->attr.name);
 }
 
 EXPORT_SYMBOL_GPL(sysfs_create_bin_file);