Commit a941f70e authored by Zhai Zhaoxuan's avatar Zhai Zhaoxuan Committed by Greg Kroah-Hartman
Browse files

staging: android: ashmem: add procfs fdinfo helper 



This print the inode number of backing file and the name in
/proc/pid/fdinfo/fd.
These information helps users to know which processes are sharing the same
ashmem.

Signed-off-by: default avatarZhai Zhaoxuan <kxuanobj@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6724ed7f

drivers/staging/android/ashmem.c

+19 −0
Original line number Diff line number Diff line
@@ -808,7 +808,23 @@ static long compat_ashmem_ioctl(struct file *file, unsigned int cmd, 
	return ashmem_ioctl(file, cmd, arg);

}

#endif

#ifdef CONFIG_PROC_FS

static void ashmem_show_fdinfo(struct seq_file *m, struct file *file)

{

	struct ashmem_area *asma = file->private_data;



	mutex_lock(&ashmem_mutex);



	if (asma->file)

		seq_printf(m, "inode:\t%ld\n", file_inode(asma->file)->i_ino);



	if (asma->name[ASHMEM_NAME_PREFIX_LEN] != '\0')

		seq_printf(m, "name:\t%s\n",

			   asma->name + ASHMEM_NAME_PREFIX_LEN);



	mutex_unlock(&ashmem_mutex);

}

#endif

static const struct file_operations ashmem_fops = {

	.owner = THIS_MODULE,

	.open = ashmem_open,
@@ -820,6 +836,9 @@ static const struct file_operations ashmem_fops = { 
#ifdef CONFIG_COMPAT

	.compat_ioctl = compat_ashmem_ioctl,

#endif

#ifdef CONFIG_PROC_FS

	.show_fdinfo = ashmem_show_fdinfo,

#endif

};



static struct miscdevice ashmem_misc = {

CRA Git | Maintained and supported by SUSTech CRA and CCSE