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ashmem: Add routines to get in kernel reference to ashmem file

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Add get_ashmem_file and put_ashmem_file routines in ashmem driver to get
and return file references to ashmem file from within the kernel.

Change-Id: Ifbb54f7c1aab90f6d656a10a3c40ca2b65ceb89a
Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>
This commit is contained in:
Shubhraprakash Das 2010-06-19 18:42:08 -06:00 committed by Stephen Boyd
parent 5bf95d3a61
commit c30e83b813
2 changed files with 57 additions and 0 deletions
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53
drivers/staging/android/ashmem.c
View file

@ -769,6 +769,59 @@ static long ashmem_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
return ret;
}
static int is_ashmem_file(struct file *file)
{
char fname[256], *name;
name = dentry_path(file->f_dentry, fname, 256);
return strcmp(name, "/ashmem") ? 0 : 1;
}
int get_ashmem_file(int fd, struct file **filp, struct file **vm_file,
unsigned long *len)
{
int ret = -1;
struct file *file = fget(fd);
*filp = NULL;
*vm_file = NULL;
if (unlikely(file == NULL)) {
pr_err("ashmem: %s: requested data from file "
"descriptor that doesn't exist.\n", __func__);
} else {
char currtask_name[FIELD_SIZEOF(struct task_struct, comm) + 1];
pr_debug("filp %p rdev %d pid %u(%s) file %p(%ld)"
" dev id: %d\n", filp,
file->f_dentry->d_inode->i_rdev,
current->pid, get_task_comm(currtask_name, current),
file, file_count(file),
MINOR(file->f_dentry->d_inode->i_rdev));
if (is_ashmem_file(file)) {
struct ashmem_area *asma = file->private_data;
*filp = file;
*vm_file = asma->file;
*len = asma->size;
ret = 0;
} else {
pr_err("file descriptor is not an ashmem "
"region fd: %d\n", fd);
fput(file);
}
}
return ret;
}
EXPORT_SYMBOL(get_ashmem_file);
void put_ashmem_file(struct file *file)
{
char currtask_name[FIELD_SIZEOF(struct task_struct, comm) + 1];
pr_debug("rdev %d pid %u(%s) file %p(%ld)" " dev id: %d\n",
file->f_dentry->d_inode->i_rdev, current->pid,
get_task_comm(currtask_name, current), file,
file_count(file), MINOR(file->f_dentry->d_inode->i_rdev));
if (file && is_ashmem_file(file))
fput(file);
}
EXPORT_SYMBOL(put_ashmem_file);
static const struct file_operations ashmem_fops = {
.owner = THIS_MODULE,
.open = ashmem_open,

4
include/linux/ashmem.h
View file

@ -48,4 +48,8 @@ struct ashmem_pin {
#define ASHMEM_CACHE_CLEAN_RANGE _IO(__ASHMEMIOC, 12)
#define ASHMEM_CACHE_INV_RANGE _IO(__ASHMEMIOC, 13)
int get_ashmem_file(int fd, struct file **filp, struct file **vm_file,
unsigned long *len);
void put_ashmem_file(struct file *file);
#endif /* _LINUX_ASHMEM_H */