On 4/28/07, Tejun Heo <[email protected]> wrote:
Implement bin_buffer which contains a mutex and pointer to PAGE_SIZE
buffer to properly synchronize accesses to per-openfile buffer and
prepare for immediate-kobj-disconnect.
Signed-off-by: Tejun Heo <[email protected]>
---
[...]
@@ -135,14 +160,22 @@ static int open(struct inode * inode, struct file * file)
goto Error;
error = -ENOMEM;
- file->private_data = kmalloc(PAGE_SIZE, GFP_KERNEL);
- if (!file->private_data)
+ bb = kzalloc(sizeof(*bb), GFP_KERNEL);
+ if (!bb)
goto Error;
+ bb->buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
You could simply do a __get_free_page() here instead of a kmalloc(PAGE_SIZE).
@@ -155,11 +188,12 @@ static int release(struct inode * inode, struct file * file)
struct kobject * kobj = to_kobj(file->f_path.dentry->d_parent);
struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
struct bin_attribute *attr = attr_sd->s_elem.bin_attr.bin_attr;
- u8 * buffer = file->private_data;
+ struct bin_buffer *bb = file->private_data;
kobject_put(kobj);
module_put(attr->attr.owner);
- kfree(buffer);
+ kfree(bb->buffer);
And so this would become free_page().
-
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