[XFS] Rework fid encode/decode wrt 64 bit inums interacting with NFS.

SGI-PV: 937127
SGI-Modid: xfs-linux:xfs-kern:24201a
Signed-off-by: Nathan Scott <nathans@sgi.com>

fs/xfs/linux-2.6/xfs_export.c

@@ -96,9 +96,8 @@ linvfs_encode_fh(
 	int			is64 = 0;
 #if XFS_BIG_INUMS
 	vfs_t			*vfs = LINVFS_GET_VFS(inode->i_sb);
-	xfs_mount_t		*mp = XFS_VFSTOM(vfs);
 
-	if (!(mp->m_flags & XFS_MOUNT_32BITINOOPT)) {
+	if (!(vfs->vfs_flag & VFS_32BITINODES)) {
 		/* filesystem may contain 64bit inode numbers */
 		is64 = XFS_FILEID_TYPE_64FLAG;
 	}

fs/xfs/linux-2.6/xfs_vfs.h

@@ -81,6 +81,7 @@ typedef enum {
 #define VFS_RDONLY		0x0001	/* read-only vfs */
 #define VFS_GRPID		0x0002	/* group-ID assigned from directory */
 #define VFS_DMI			0x0004	/* filesystem has the DMI enabled */
+#define VFS_32BITINODES		0x0008	/* do not use inums above 32 bits */
 #define VFS_END			0x0008	/* max flag */
 
 #define SYNC_ATTR		0x0001	/* sync attributes */

fs/xfs/xfs_fsops.c

@@ -171,7 +171,7 @@ xfs_growfs_data_private(
 		memset(&mp->m_perag[oagcount], 0,
 			(nagcount - oagcount) * sizeof(xfs_perag_t));
 		mp->m_flags |= XFS_MOUNT_32BITINODES;
-		nagimax = xfs_initialize_perag(mp, nagcount);
+		nagimax = xfs_initialize_perag(XFS_MTOVFS(mp), mp, nagcount);
 		up_write(&mp->m_peraglock);
 	}
 	tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);

fs/xfs/xfs_mount.c

@@ -316,7 +316,10 @@ xfs_mount_validate_sb(
 }
 
 xfs_agnumber_t
-xfs_initialize_perag(xfs_mount_t *mp, xfs_agnumber_t agcount)
+xfs_initialize_perag(
+	struct vfs	*vfs,
+	xfs_mount_t	*mp,
+	xfs_agnumber_t	agcount)
 {
 	xfs_agnumber_t	index, max_metadata;
 	xfs_perag_t	*pag;
@@ -332,7 +335,7 @@ xfs_initialize_perag(xfs_mount_t *mp, xfs_agnumber_t agcount)
 	/* Clear the mount flag if no inode can overflow 32 bits
 	 * on this filesystem, or if specifically requested..
 	 */
-	if ((mp->m_flags & XFS_MOUNT_32BITINOOPT) && ino > max_inum) {
+	if ((vfs->vfs_flag & VFS_32BITINODES) && ino > max_inum) {
 		mp->m_flags |= XFS_MOUNT_32BITINODES;
 	} else {
 		mp->m_flags &= ~XFS_MOUNT_32BITINODES;
@@ -944,7 +947,7 @@ xfs_mountfs(
 	mp->m_perag =
 		kmem_zalloc(sbp->sb_agcount * sizeof(xfs_perag_t), KM_SLEEP);
 
-	mp->m_maxagi = xfs_initialize_perag(mp, sbp->sb_agcount);
+	mp->m_maxagi = xfs_initialize_perag(vfsp, mp, sbp->sb_agcount);
 
 	/*
 	 * log's mount-time initialization. Perform 1st part recovery if needed

fs/xfs/xfs_mount.h

@@ -402,7 +402,7 @@ typedef struct xfs_mount {
 						/* osyncisdsync is now default*/
 #define XFS_MOUNT_32BITINODES	(1ULL << 14)	/* do not create inodes above
 						 * 32 bits in size */
-#define XFS_MOUNT_32BITINOOPT	(1ULL << 15)	/* saved mount option state */
+			     /* (1ULL << 15)	-- currently unused */
 #define XFS_MOUNT_NOUUID	(1ULL << 16)	/* ignore uuid during mount */
 #define XFS_MOUNT_BARRIER	(1ULL << 17)
 #define XFS_MOUNT_IDELETE	(1ULL << 18)	/* delete empty inode clusters*/
@@ -557,7 +557,8 @@ extern void	xfs_freesb(xfs_mount_t *);
 extern void	xfs_do_force_shutdown(bhv_desc_t *, int, char *, int);
 extern int	xfs_syncsub(xfs_mount_t *, int, int, int *);
 extern int	xfs_sync_inodes(xfs_mount_t *, int, int, int *);
-extern xfs_agnumber_t	xfs_initialize_perag(xfs_mount_t *, xfs_agnumber_t);
+extern xfs_agnumber_t	xfs_initialize_perag(struct vfs *, xfs_mount_t *,
+						xfs_agnumber_t);
 extern void	xfs_xlatesb(void *, struct xfs_sb *, int, __int64_t);
 
 extern struct xfs_dmops xfs_dmcore_stub;

fs/xfs/xfs_vfsops.c

@@ -269,7 +269,7 @@ xfs_start_flags(
 	if (ap->flags & XFSMNT_OSYNCISOSYNC)
 		mp->m_flags |= XFS_MOUNT_OSYNCISOSYNC;
 	if (ap->flags & XFSMNT_32BITINODES)
-		mp->m_flags |= (XFS_MOUNT_32BITINODES | XFS_MOUNT_32BITINOOPT);
+		mp->m_flags |= XFS_MOUNT_32BITINODES;
 
 	if (ap->flags & XFSMNT_IOSIZE) {
 		if (ap->iosizelog > XFS_MAX_IO_LOG ||
@@ -1868,6 +1868,9 @@ printk("XFS: irixsgid is now a sysctl(2) variable, option is deprecated.\n");
 		args->sunit = args->swidth = 0;
 	}
 
+	if (args->flags & XFSMNT_32BITINODES)
+		vfsp->vfs_flag |= VFS_32BITINODES;
+
 	if (args->flags2)
 		args->flags |= XFSMNT_FLAGS2;
 	return 0;
@@ -1929,15 +1932,15 @@ xfs_showargs(
 		seq_printf(m, "," MNTOPT_SWIDTH "=%d",
 				(int)XFS_FSB_TO_BB(mp, mp->m_swidth));
 
-	if (!(mp->m_flags & XFS_MOUNT_32BITINOOPT))
-		seq_printf(m, "," MNTOPT_64BITINODE);
-
 	if (!(mp->m_flags & XFS_MOUNT_COMPAT_ATTR))
 		seq_printf(m, "," MNTOPT_ATTR2);
 
 	if (!(mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE))
 		seq_printf(m, "," MNTOPT_LARGEIO);
 
+	if (!(vfsp->vfs_flag & VFS_32BITINODES))
+		seq_printf(m, "," MNTOPT_64BITINODE);
+
 	if (vfsp->vfs_flag & VFS_GRPID)
 		seq_printf(m, "," MNTOPT_GRPID);