[PATCH v3 9/9] xfs: allow bulkstat_single of special inodes

["Darrick J. Wong" <darrick.wong@oracle.com>]

From: Darrick J. Wong <darrick.wong@oracle.com>

Create a new bulk ireq flag that enables userspace to ask us for a
special inode number instead of interpreting @ino as a literal inode
number.  This enables us to query the root inode easily.

The reason for adding the ability to query specifically the root
directory inode is that certain programs (xfsdump and xfsrestore) want
to confirm when they've been pointed to the root directory.  The
userspace code assumes the root directory is always the first result
from calling bulkstat with lastino == 0, but this isn't true if the
(initial btree roots + initial AGFL + inode alignment padding) is itself
long enough to be allocated to new inodes if all of those blocks should
happen to be free at the same time.  Rather than make userspace guess
at internal filesystem state, we provide a direct query.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Allison Collins <allison.henderson@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
---
v3: attach to the bulkstat ioctl having dropped bulkstat_single
v2: elaborate on why we are adding this new ireq flag
---
 fs/xfs/libxfs/xfs_fs.h |   13 ++++++++++++-
 fs/xfs/xfs_ioctl.c     |   19 +++++++++++++++++++
 2 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
index d7b3b712b279..52d03a3a02a4 100644
--- a/fs/xfs/libxfs/xfs_fs.h
+++ b/fs/xfs/libxfs/xfs_fs.h
@@ -472,7 +472,18 @@ struct xfs_bulk_ireq {
  */
 #define XFS_BULK_IREQ_AGNO	(1 << 0)
 
-#define XFS_BULK_IREQ_FLAGS_ALL	(XFS_BULK_IREQ_AGNO)
+/*
+ * Return bulkstat information for a single inode, where @ino value is a
+ * special value, not a literal inode number.  See the XFS_BULK_IREQ_SPECIAL_*
+ * values below.  Not compatible with XFS_BULK_IREQ_AGNO.
+ */
+#define XFS_BULK_IREQ_SPECIAL	(1 << 1)
+
+#define XFS_BULK_IREQ_FLAGS_ALL	(XFS_BULK_IREQ_AGNO | \
+				 XFS_BULK_IREQ_SPECIAL)
+
+/* Operate on the root directory inode. */
+#define XFS_BULK_IREQ_SPECIAL_ROOT	(1)
 
 /*
  * ioctl structures for v5 bulkstat and inumbers requests
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index e1e1d9d6c16d..6bf04e71325b 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -853,6 +853,25 @@ xfs_bulk_ireq_setup(
 	breq->ocount = 0;
 	breq->flags = 0;
 
+	/*
+	 * The @ino parameter is a special value, so we must look it up here.
+	 * We're not allowed to have IREQ_AGNO, and we only return one inode
+	 * worth of data.
+	 */
+	if (hdr->flags & XFS_BULK_IREQ_SPECIAL) {
+		if (hdr->flags & XFS_BULK_IREQ_AGNO)
+			return -EINVAL;
+
+		switch (hdr->ino) {
+		case XFS_BULK_IREQ_SPECIAL_ROOT:
+			hdr->ino = mp->m_sb.sb_rootino;
+			break;
+		default:
+			return -EINVAL;
+		}
+		breq->icount = 1;
+	}
+
 	/*
 	 * The IREQ_AGNO flag means that we only want results from a given AG.
 	 * If @hdr->ino is zero, we start iterating in that AG.  If @hdr->ino is