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authorZhai Zhaoxuan <kxuanobj@gmail.com>2017-12-28 21:56:06 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-01-08 16:37:18 +0100
commita941f70e55471367de8e9c3cc44b47303ba1a87d (patch)
tree8ba1318a43c759e50e5da47826f408850975c1d8 /drivers/staging/android/ashmem.c
parent6724ed7f28d6e83956a7219a9a02a4d620ef65d8 (diff)
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: Zhai Zhaoxuan <kxuanobj@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/android/ashmem.c')
-rw-r--r--drivers/staging/android/ashmem.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c
index 4e8947923904..425c49f9330c 100644
--- a/drivers/staging/android/ashmem.c
+++ b/drivers/staging/android/ashmem.c
@@ -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 = {