Subject: [RFC 5/6] sysfs backing store ver 0.5
From: Maneesh Soni <[email-masked]>
To: LKML <[email-masked]>
Cc: Al Viro <[email-masked]>, Greg KH <[email-masked]>
Date: Wed, 5 May 2004 18:29:25 +0530

=> changes in version 0.5
  o Changes to accomodate latest changes in sysfs like doing
    module_get/put while open() and release() functions.

=> changes in version 0.4
  o Made necessary changes for checking DCACHE_SYSFS_CONNECTED flag while
    opening the sysfs file in open() and a few changes in variable names.

=> changes in version 0.3
  o Nil, just re-diffed

=> changes in version 0.2
  o Nil, just re-diffed

o This patch contains changes required for bin attribute files.

 fs/sysfs/bin.c |   52 +++++++++++++++++++---------------------------------
 1 files changed, 19 insertions(+), 33 deletions(-)

diff -upN reference/fs/sysfs/bin.c current/fs/sysfs/bin.c
--- reference/fs/sysfs/bin.c	2004-05-09 13:45:22.000000000 -0700
+++ current/fs/sysfs/bin.c	2004-05-09 13:45:22.000000000 -0700
@@ -17,8 +17,10 @@
 static int
 fill_read(struct dentry *dentry, char *buffer, loff_t off, size_t count)
 {
-	struct bin_attribute * attr = dentry->d_fsdata;
-	struct kobject * kobj = dentry->d_parent->d_fsdata;
+	struct sysfs_dirent * attr_sd = dentry->d_fsdata;
+	struct bin_attribute * attr = attr_sd->s_element;
+	struct sysfs_dirent * kobj_sd = dentry->d_parent->d_fsdata;
+	struct kobject * kobj = kobj_sd->s_element;
 
 	return attr->read(kobj, buffer, off, count);
 }
@@ -60,8 +62,10 @@ read(struct file * file, char __user * u
 static int
 flush_write(struct dentry *dentry, char *buffer, loff_t offset, size_t count)
 {
-	struct bin_attribute *attr = dentry->d_fsdata;
-	struct kobject *kobj = dentry->d_parent->d_fsdata;
+	struct sysfs_dirent * attr_sd = dentry->d_fsdata;
+	struct bin_attribute * attr = attr_sd->s_element;
+	struct sysfs_dirent * kobj_sd = dentry->d_parent->d_fsdata;
+	struct kobject * kobj = kobj_sd->s_element;
 
 	return attr->write(kobj, buffer, offset, count);
 }
@@ -95,7 +99,8 @@ static ssize_t write(struct file * file,
 static int open(struct inode * inode, struct file * file)
 {
 	struct kobject *kobj = sysfs_get_kobject(file->f_dentry->d_parent);
-	struct bin_attribute * attr = file->f_dentry->d_fsdata;
+	struct sysfs_dirent * attr_sd = file->f_dentry->d_fsdata;
+	struct bin_attribute * attr = attr_sd->s_element;
 	int error = -EINVAL;
 
 	if (!kobj || !attr)
@@ -130,8 +135,10 @@ static int open(struct inode * inode, st
 
 static int release(struct inode * inode, struct file * file)
 {
-	struct kobject * kobj = file->f_dentry->d_parent->d_fsdata;
-	struct bin_attribute * attr = file->f_dentry->d_fsdata;
+	struct sysfs_dirent * sd = file->f_dentry->d_parent->d_fsdata;
+	struct kobject * kobj = sd->s_element;
+	struct sysfs_dirent * attr_sd = file->f_dentry->d_fsdata;
+	struct bin_attribute * attr = attr_sd->s_element;
 	u8 * buffer = file->private_data;
 
 	if (kobj) 
@@ -141,7 +148,7 @@ static int release(struct inode * inode,
 	return 0;
 }
 
-static struct file_operations bin_fops = {
+struct file_operations bin_fops = {
 	.read		= read,
 	.write		= write,
 	.llseek		= generic_file_llseek,
@@ -158,31 +165,10 @@ static struct file_operations bin_fops =
 
 int sysfs_create_bin_file(struct kobject * kobj, struct bin_attribute * attr)
 {
-	struct dentry * dentry;
-	struct dentry * parent;
-	int error = 0;
-
-	if (!kobj || !attr)
-		return -EINVAL;
-
-	parent = kobj->dentry;
-
-	down(&parent->d_inode->i_sem);
-	dentry = sysfs_get_dentry(parent,attr->attr.name);
-	if (!IS_ERR(dentry)) {
-		dentry->d_fsdata = (void *)attr;
-		error = sysfs_create(dentry,
-				     (attr->attr.mode & S_IALLUGO) | S_IFREG,
-				     NULL);
-		if (!error) {
-			dentry->d_inode->i_size = attr->size;
-			dentry->d_inode->i_fop = &bin_fops;
-		}
-		dput(dentry);
-	} else
-		error = PTR_ERR(dentry);
-	up(&parent->d_inode->i_sem);
-	return error;
+	if (kobj && kobj->dentry && attr) 
+		return sysfs_add_file(kobj->dentry, &attr->attr, 
+					SYSFS_KOBJ_BIN_ATTR);
+	return -EINVAL;
 }