[PATCH 07/17] AFS: Implement the PGetFid pioctl

[David Howells <dhowells@xxxxxxxxxx>]

From: Jacob Thebault-Spieker <summatusmentis@xxxxxxxxx>

Implement the PGetFID pioctl for AFS.  This will get the FID of a specified
file and return it to userspace.

This can be tested with the OpenAFS userspace tools by doing:

	fs getfid /afs

on a mounted AFS filesystem, which should return something like:

	File /afs (1.1.0) contained in volume 1

Signed-off-by: Jacob Thebault-Spieker <summatusmentis@xxxxxxxxx>
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
---

 fs/afs/pioctl.c         |   30 ++++++++++++++++++++++++++++++
 include/linux/afscall.h |    3 +++
 include/linux/venus.h   |    1 +
 3 files changed, 34 insertions(+), 0 deletions(-)


diff --git a/fs/afs/pioctl.c b/fs/afs/pioctl.c
index 6cac006..2e4f741 100644
--- a/fs/afs/pioctl.c
+++ b/fs/afs/pioctl.c
@@ -10,9 +10,35 @@
 #include <linux/fs.h>
 #include <linux/afscall.h>
 #include <linux/pioctl.h>
+#include <linux/venus.h>
 #include "internal.h"
 
 /*
+ * Get the AFS file identifier of a file
+ */
+static long afs_PGetFID(struct dentry *dentry, struct vice_ioctl *arg,
+			struct key *key)
+{
+	struct afs_vnode *vnode;
+
+	_enter("");
+
+	vnode = AFS_FS_I(dentry->d_inode);
+
+	if (arg->out_size < sizeof(vnode->fid)) {
+		_leave(" = -EINVAL [%d < %zu]",
+		       arg->out_size, sizeof(vnode->fid));
+		return -EINVAL;
+	}
+
+	memcpy(arg->out, &vnode->fid, sizeof(vnode->fid));
+	arg->out_size = sizeof(vnode->fid);
+
+	_leave(" = 0 [%d]", arg->out_size);
+	return 0;
+}
+
+/*
  * The AFS path-based I/O control operation
  */
 long afs_pioctl(struct dentry *dentry, int cmd, struct vice_ioctl *arg)
@@ -34,6 +60,10 @@ long afs_pioctl(struct dentry *dentry, int cmd, struct vice_ioctl *arg)
 #define VIOC_COMMAND(nr) (_VICEIOCTL(nr) & ~IOCSIZE_MASK)
 
 	switch (cmd & ~IOCSIZE_MASK) {
+	case VIOC_COMMAND(PGetFID):
+		ret = afs_PGetFID(dentry, arg, key);
+		break;
+
 	default:
 		_debug("fallback to pathless: %x", cmd);
 		ret = afs_pathless_pioctl(cmd, arg);
diff --git a/include/linux/afscall.h b/include/linux/afscall.h
index 40cbfa5..cb006a2 100644
--- a/include/linux/afscall.h
+++ b/include/linux/afscall.h
@@ -13,4 +13,7 @@
 
 #define AFSCALL_PIOCTL 0x14
 
+/* pioctl commands */
+#define PGetFID		22		/* get file ID */
+
 #endif /* _LINUX_AFSCALL_H */
diff --git a/include/linux/venus.h b/include/linux/venus.h
index 19fe13e..ea896e4 100644
--- a/include/linux/venus.h
+++ b/include/linux/venus.h
@@ -17,5 +17,6 @@
 /*
  * pioctl commands (not usable as ioctls)
  */
+#define VIOCGETFID		_VICEIOCTL(PGetFID)
 
 #endif /* _LINUX_VENUS_H */

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