sysfs: add struct file* to bin_attr callbacks

This allows bin_attr->read,write,mmap callbacks to check file specific data
(such as inode owner) as part of any privilege validation.

Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 11 insertions, 13 deletions

diff --git a/fs/sysfs/bin.c b/fs/sysfs/bin.c
index 806b277453f9..4e321f7353fa 100644
--- a/fs/sysfs/bin.c
+++ b/fs/sysfs/bin.c
@@ -46,9 +46,9 @@ struct bin_buffer {
 };
 
 static int
-fill_read(struct dentry *dentry, char *buffer, loff_t off, size_t count)
+fill_read(struct file *file, char *buffer, loff_t off, size_t count)
 {
-        struct sysfs_dirent *attr_sd = dentry->d_fsdata;
+        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;
@@ -59,7 +59,7 @@ fill_read(struct dentry *dentry, char *buffer, loff_t off, size_t count)
 
         rc = -EIO;
         if (attr->read)
-                rc = attr->read(kobj, attr, buffer, off, count);
+                rc = attr->read(file, kobj, attr, buffer, off, count);
 
         sysfs_put_active(attr_sd);
 
@@ -70,8 +70,7 @@ static ssize_t
 read(struct file *file, char __user *userbuf, size_t bytes, loff_t *off)
 {
         struct bin_buffer *bb = file->private_data;
-        struct dentry *dentry = file->f_path.dentry;
-        int size = dentry->d_inode->i_size;
+        int size = file->f_path.dentry->d_inode->i_size;
         loff_t offs = *off;
         int count = min_t(size_t, bytes, PAGE_SIZE);
         char *temp;
@@ -92,7 +91,7 @@ read(struct file *file, char __user *userbuf, size_t bytes, loff_t *off)
 
         mutex_lock(&bb->mutex);
 
-        count = fill_read(dentry, bb->buffer, offs, count);
+        count = fill_read(file, bb->buffer, offs, count);
         if (count < 0) {
                 mutex_unlock(&bb->mutex);
                 goto out_free;
@@ -117,9 +116,9 @@ read(struct file *file, char __user *userbuf, size_t bytes, loff_t *off)
 }
 
 static int
-flush_write(struct dentry *dentry, char *buffer, loff_t offset, size_t count)
+flush_write(struct file *file, char *buffer, loff_t offset, size_t count)
 {
-        struct sysfs_dirent *attr_sd = dentry->d_fsdata;
+        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;
@@ -130,7 +129,7 @@ flush_write(struct dentry *dentry, char *buffer, loff_t offset, size_t count)
 
         rc = -EIO;
         if (attr->write)
-                rc = attr->write(kobj, attr, buffer, offset, count);
+                rc = attr->write(file, kobj, attr, buffer, offset, count);
 
         sysfs_put_active(attr_sd);
 
@@ -141,8 +140,7 @@ static ssize_t write(struct file *file, const char __user *userbuf,
                      size_t bytes, loff_t *off)
 {
         struct bin_buffer *bb = file->private_data;
-        struct dentry *dentry = file->f_path.dentry;
-        int size = dentry->d_inode->i_size;
+        int size = file->f_path.dentry->d_inode->i_size;
         loff_t offs = *off;
         int count = min_t(size_t, bytes, PAGE_SIZE);
         char *temp;
@@ -165,7 +163,7 @@ static ssize_t write(struct file *file, const char __user *userbuf,
 
         memcpy(bb->buffer, temp, count);
 
-        count = flush_write(dentry, bb->buffer, offs, count);
+        count = flush_write(file, bb->buffer, offs, count);
         mutex_unlock(&bb->mutex);
 
         if (count > 0)
@@ -363,7 +361,7 @@ static int mmap(struct file *file, struct vm_area_struct *vma)
         if (!attr->mmap)
                 goto out_put;
 
-        rc = attr->mmap(kobj, attr, vma);
+        rc = attr->mmap(file, kobj, attr, vma);
         if (rc)
                 goto out_put;