From f5caa421d1bb826559ec7a6d98c1a6b6b1f0a629 Mon Sep 17 00:00:00 2001
From: Maxim Perevedentsev <mperevedentsev@virtuozzo.com>
Date: Tue, 27 Oct 2015 18:20:45 +0300
Subject: [PATCH] Added xfs support to vfs_minimum_size.

---
 daemon/daemon.h      |  1 +
 daemon/fs-min-size.c |  7 +++++++
 daemon/xfs.c         | 16 ++++++++++++++++
 generator/actions.ml |  6 +++++-
 4 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/daemon/daemon.h b/daemon/daemon.h
index 4a969ddd5..1f0cd30c3 100644
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -269,6 +269,7 @@ extern int copy_xattrs (const char *src, const char *dest);
 extern int xfs_set_uuid (const char *device, const char *uuid);
 extern int xfs_set_uuid_random (const char *device);
 extern int xfs_set_label (const char *device, const char *label);
+extern int64_t xfs_minimum_size (const char *path);
 
 /*-- debug-bmap.c --*/
 extern char *debug_bmap (const char *subcmd, size_t argc, char *const *const argv);
diff --git a/daemon/fs-min-size.c b/daemon/fs-min-size.c
index ca71c4d5e..ba0f73928 100644
--- a/daemon/fs-min-size.c
+++ b/daemon/fs-min-size.c
@@ -73,6 +73,13 @@ do_vfs_minimum_size (const mountable_t *mountable)
     r = btrfs_minimum_size (path);
   }
 
+  else if (STREQ (vfs_type, "xfs")) {
+    CLEANUP_FREE char *path = get_mount_point (mountable->device);
+    if (path == NULL)
+      return -1;
+    r = xfs_minimum_size (path);
+  }
+
   else
     NOT_SUPPORTED (-1, "don't know how to get minimum size of '%s' filesystems",
                    vfs_type);
diff --git a/daemon/xfs.c b/daemon/xfs.c
index f74890201..abc2736ac 100644
--- a/daemon/xfs.c
+++ b/daemon/xfs.c
@@ -660,3 +660,19 @@ do_xfs_repair (const char *device,
 
   return r;
 }
+
+int64_t
+xfs_minimum_size (const char *path)
+{
+  CLEANUP_FREE guestfs_int_xfsinfo *info = do_xfs_info (path);
+
+  if (info == NULL)
+    return -1;
+
+  // XFS does not support shrinking.
+  if (INT64_MAX / info->xfs_blocksize < info->xfs_datablocks) {
+    reply_with_error ("filesystem size too big: overflow");
+    return -1;
+  }
+  return info->xfs_blocksize * info->xfs_datablocks;
+}
diff --git a/generator/actions.ml b/generator/actions.ml
index 8832410ac..d8af08d6f 100644
--- a/generator/actions.ml
+++ b/generator/actions.ml
@@ -12765,6 +12765,10 @@ To read the UUID on a filesystem, call C<guestfs_vfs_uuid>." };
         [["mkfs"; "btrfs"; "/dev/sda1"; ""; "NOARG"; ""; ""; "NOARG"];
          ["mount"; "/dev/sda1"; "/"];
          ["vfs_minimum_size"; "/dev/sda1"]]), [];
+      InitPartition, Always, TestRun (
+        [["mkfs"; "xfs"; "/dev/sda1"; ""; "NOARG"; ""; ""; "NOARG"];
+         ["mount"; "/dev/sda1"; "/"];
+         ["vfs_minimum_size"; "/dev/sda1"]]), [];
     ];
     shortdesc = "get minimum filesystem size";
     longdesc = "\
@@ -12774,7 +12778,7 @@ This is the minimum possible size for filesystem shrinking.
 If getting minimum size of specified filesystem is not supported,
 this will fail and set errno as ENOTSUP.
 
-See also L<ntfsresize(8)>, L<resize2fs(8)>, L<btrfs(8)>." };
+See also L<ntfsresize(8)>, L<resize2fs(8)>, L<btrfs(8)>, L<xfs_info(8)>." };
 
 ]