DL-Mirrors/kernel-tenderloin-3.0
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Implement read(2) in ashmem driver

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Bug: 2595601
Change-Id: I47c0016f594f9354fb8658ccb26e3d395bcb137b
Signed-off-by: Bjorn Bringert <bringert@android.com>
This commit is contained in:
Bjorn Bringert
2010-04-15 10:04:01 +01:00
committed by Colin Cross
parent f23ba5021d
commit 6809f0087c
1 changed files with 26 additions and 0 deletions
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26
mm/ashmem.c
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@@ -211,6 +211,31 @@ static int ashmem_release(struct inode *ignored, struct file *file)
return 0; return 0;
} }
static ssize_t ashmem_read(struct file *file, char __user *buf,
size_t len, loff_t *pos)
{
struct ashmem_area *asma = file->private_data;
int ret = 0;
mutex_lock(&ashmem_mutex);
/* If size is not set, or set to 0, always return EOF. */
if (asma->size == 0) {
goto out;
}
if (!asma->file) {
ret = -EBADF;
goto out;
}
ret = asma->file->f_op->read(asma->file, buf, len, pos);
out:
mutex_unlock(&ashmem_mutex);
return ret;
}
static int ashmem_mmap(struct file *file, struct vm_area_struct *vma) static int ashmem_mmap(struct file *file, struct vm_area_struct *vma)
{ {
struct ashmem_area *asma = file->private_data; struct ashmem_area *asma = file->private_data;
@@ -604,6 +629,7 @@ static struct file_operations ashmem_fops = {
.owner = THIS_MODULE, .owner = THIS_MODULE,
.open = ashmem_open, .open = ashmem_open,
.release = ashmem_release, .release = ashmem_release,
.read = ashmem_read,
.mmap = ashmem_mmap, .mmap = ashmem_mmap,
.unlocked_ioctl = ashmem_ioctl, .unlocked_ioctl = ashmem_ioctl,
.compat_ioctl = ashmem_ioctl, .compat_ioctl = ashmem_ioctl,