xfs: introduce directory geometry structure

The directory code has a dependency on the struct xfs_mount to
supply the directory block geometry. Block size, block log size,
and other parameters are pre-caclulated in the struct xfs_mount or
access directly from the superblock embedded in the struct
xfs_mount.

Extract all of this geometry information out of the struct xfs_mount
and superblock and place it into a new struct xfs_da_geometry
defined by the directory code. Allocate and initialise it at mount
time, and attach it to the struct xfs_mount so it canbe passed back
into the directory code appropriately rather than using the struct
xfs_mount.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

fs/xfs/xfs_attr.c

@@ -88,6 +88,7 @@ xfs_attr_args_init(
 		return EINVAL;
 
 	memset(args, 0, sizeof(*args));
+	args->geo = dp->i_mount->m_attr_geo;
 	args->whichfork = XFS_ATTR_FORK;
 	args->dp = dp;
 	args->flags = flags;

fs/xfs/xfs_attr_leaf.c

@@ -711,6 +711,7 @@ xfs_attr_shortform_to_leaf(xfs_da_args_t *args)
 
 	memset((char *)&nargs, 0, sizeof(nargs));
 	nargs.dp = dp;
+	nargs.geo = args->geo;
 	nargs.firstblock = args->firstblock;
 	nargs.flist = args->flist;
 	nargs.total = args->total;
@@ -838,6 +839,7 @@ xfs_attr3_leaf_to_shortform(
 	 * Copy the attributes
 	 */
 	memset((char *)&nargs, 0, sizeof(nargs));
+	nargs.geo = args->geo;
 	nargs.dp = dp;
 	nargs.firstblock = args->firstblock;
 	nargs.flist = args->flist;

fs/xfs/xfs_attr_list.c

@@ -444,6 +444,7 @@ xfs_attr3_leaf_list_int(
 				xfs_da_args_t args;
 
 				memset((char *)&args, 0, sizeof(args));
+				args.geo = context->dp->i_mount->m_attr_geo;
 				args.dp = context->dp;
 				args.whichfork = XFS_ATTR_FORK;
 				args.valuelen = valuelen;

fs/xfs/xfs_da_btree.h

@@ -25,6 +25,23 @@ struct xfs_trans;
 struct zone;
 struct xfs_dir_ops;
 
+/*
+ * Directory/attribute geometry information. There will be one of these for each
+ * data fork type, and it will be passed around via the xfs_da_args. Global
+ * structures will be attached to the xfs_mount.
+ */
+struct xfs_da_geometry {
+	int		blksize;	/* da block size in bytes */
+	int		fsbcount;	/* da block size in filesystem blocks */
+	uint8_t		fsblog;		/* log2 of _filesystem_ block size */
+	uint8_t		blklog;		/* log2 of da block size */
+	uint		node_ents;	/* # of entries in a danode */
+	int		magicpct;	/* 37% of block size in bytes */
+	xfs_dablk_t	datablk;	/* blockno of dir data v2 */
+	xfs_dablk_t	leafblk;	/* blockno of leaf data v2 */
+	xfs_dablk_t	freeblk;	/* blockno of free data v2 */
+};
+
 /*========================================================================
  * Btree searching and modification structure definitions.
  *========================================================================*/
@@ -42,6 +59,7 @@ enum xfs_dacmp {
  * Structure to ease passing around component names.
  */
 typedef struct xfs_da_args {
+	struct xfs_da_geometry *geo;	/* da block geometry */
 	const __uint8_t	*name;		/* string (maybe not NULL terminated) */
 	int		namelen;	/* length of string (maybe no NULL) */
 	__uint8_t	filetype;	/* filetype of inode for directories */

fs/xfs/xfs_dir2.c

@@ -85,11 +85,12 @@ static struct xfs_nameops xfs_ascii_ci_nameops = {
 	.compname	= xfs_ascii_ci_compname,
 };
 
-void
-xfs_dir_mount(
-	xfs_mount_t	*mp)
+int
+xfs_da_mount(
+	struct xfs_mount	*mp)
 {
-	int	nodehdr_size;
+	struct xfs_da_geometry	*dageo;
+	int			nodehdr_size;
 
 
 	ASSERT(xfs_sb_version_hasdirv2(&mp->m_sb));
@@ -99,24 +100,64 @@ xfs_dir_mount(
 	mp->m_dir_inode_ops = xfs_dir_get_ops(mp, NULL);
 	mp->m_nondir_inode_ops = xfs_nondir_get_ops(mp, NULL);
 
-	mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
-	mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
-	mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
-	mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
-	mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));
-
 	nodehdr_size = mp->m_dir_inode_ops->node_hdr_size;
-	mp->m_attr_node_ents = (mp->m_sb.sb_blocksize - nodehdr_size) /
+	mp->m_dir_geo = kmem_zalloc(sizeof(struct xfs_da_geometry),
+				    KM_SLEEP | KM_MAYFAIL);
+	mp->m_attr_geo = kmem_zalloc(sizeof(struct xfs_da_geometry),
+				     KM_SLEEP | KM_MAYFAIL);
+	if (!mp->m_dir_geo || !mp->m_attr_geo) {
+		kmem_free(mp->m_dir_geo);
+		kmem_free(mp->m_attr_geo);
+		return ENOMEM;
+	}
+
+	/* set up directory geometry */
+	dageo = mp->m_dir_geo;
+	dageo->blklog = mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog;
+	dageo->fsblog = mp->m_sb.sb_blocklog;
+	dageo->blksize = 1 << dageo->blklog;
+	dageo->fsbcount = 1 << mp->m_sb.sb_dirblklog;
+	dageo->datablk = xfs_dir2_byte_to_da(mp, XFS_DIR2_DATA_OFFSET);
+	dageo->leafblk = xfs_dir2_byte_to_da(mp, XFS_DIR2_LEAF_OFFSET);
+	dageo->freeblk = xfs_dir2_byte_to_da(mp, XFS_DIR2_FREE_OFFSET);
+	dageo->node_ents = (dageo->blksize - nodehdr_size) /
 				(uint)sizeof(xfs_da_node_entry_t);
-	mp->m_dir_node_ents = (mp->m_dirblksize - nodehdr_size) /
+	dageo->magicpct = (dageo->blksize * 37) / 100;
+
+	/* set up attribute geometry - single fsb only */
+	dageo = mp->m_attr_geo;
+	dageo->blklog = mp->m_sb.sb_blocklog;
+	dageo->fsblog = mp->m_sb.sb_blocklog;
+	dageo->blksize = 1 << dageo->blklog;
+	dageo->fsbcount = 1;
+	dageo->node_ents = (dageo->blksize - nodehdr_size) /
 				(uint)sizeof(xfs_da_node_entry_t);
+	dageo->magicpct = (dageo->blksize * 37) / 100;
 
-	mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
 	if (xfs_sb_version_hasasciici(&mp->m_sb))
 		mp->m_dirnameops = &xfs_ascii_ci_nameops;
 	else
 		mp->m_dirnameops = &xfs_default_nameops;
 
+	/* XXX: these are to be removed as code is converted to use geo */
+	mp->m_dirblksize = mp->m_dir_geo->blksize;
+	mp->m_dirblkfsbs = mp->m_dir_geo->fsbcount;
+	mp->m_dirdatablk = mp->m_dir_geo->datablk;
+	mp->m_dirleafblk = mp->m_dir_geo->leafblk;
+	mp->m_dirfreeblk = mp->m_dir_geo->freeblk;
+	mp->m_dir_node_ents = mp->m_dir_geo->node_ents;
+	mp->m_dir_magicpct = mp->m_dir_geo->magicpct;
+	mp->m_attr_node_ents = mp->m_attr_geo->node_ents;
+	mp->m_attr_magicpct = mp->m_attr_geo->magicpct;
+	return 0;
+}
+
+void
+xfs_da_unmount(
+	struct xfs_mount	*mp)
+{
+	kmem_free(mp->m_dir_geo);
+	kmem_free(mp->m_attr_geo);
 }
 
 /*
@@ -192,6 +233,7 @@ xfs_dir_init(
 	if (!args)
 		return ENOMEM;
 
+	args->geo = dp->i_mount->m_dir_geo;
 	args->dp = dp;
 	args->trans = tp;
 	error = xfs_dir2_sf_create(args, pdp->i_ino);
@@ -226,6 +268,7 @@ xfs_dir_createname(
 	if (!args)
 		return ENOMEM;
 
+	args->geo = dp->i_mount->m_dir_geo;
 	args->name = name->name;
 	args->namelen = name->len;
 	args->filetype = name->type;
@@ -320,6 +363,7 @@ xfs_dir_lookup(
 	 * annotations into the reclaim path for the ilock.
 	 */
 	args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
+	args->geo = dp->i_mount->m_dir_geo;
 	args->name = name->name;
 	args->namelen = name->len;
 	args->filetype = name->type;
@@ -391,6 +435,7 @@ xfs_dir_removename(
 	if (!args)
 		return ENOMEM;
 
+	args->geo = dp->i_mount->m_dir_geo;
 	args->name = name->name;
 	args->namelen = name->len;
 	args->filetype = name->type;
@@ -455,6 +500,7 @@ xfs_dir_replace(
 	if (!args)
 		return ENOMEM;
 
+	args->geo = dp->i_mount->m_dir_geo;
 	args->name = name->name;
 	args->namelen = name->len;
 	args->filetype = name->type;
@@ -516,6 +562,7 @@ xfs_dir_canenter(
 	if (!args)
 		return ENOMEM;
 
+	args->geo = dp->i_mount->m_dir_geo;
 	args->name = name->name;
 	args->namelen = name->len;
 	args->filetype = name->type;

fs/xfs/xfs_dir2.h

@@ -112,7 +112,9 @@ extern const struct xfs_dir_ops *
  * Generic directory interface routines
  */
 extern void xfs_dir_startup(void);
-extern void xfs_dir_mount(struct xfs_mount *mp);
+extern int xfs_da_mount(struct xfs_mount *mp);
+extern void xfs_da_unmount(struct xfs_mount *mp);
+
 extern int xfs_dir_isempty(struct xfs_inode *dp);
 extern int xfs_dir_init(struct xfs_trans *tp, struct xfs_inode *dp,
 				struct xfs_inode *pdp);

fs/xfs/xfs_mount.c

@@ -774,12 +774,11 @@ xfs_mountfs(
 
 	mp->m_dmevmask = 0;	/* not persistent; set after each mount */
 
-	xfs_dir_mount(mp);
-
-	/*
-	 * Initialize the attribute manager's entries.
-	 */
-	mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100;
+	error = xfs_da_mount(mp);
+	if (error) {
+		xfs_warn(mp, "Failed dir/attr init: %d", error);
+		goto out_remove_uuid;
+	}
 
 	/*
 	 * Initialize the precomputed transaction reservations values.
@@ -794,7 +793,7 @@ xfs_mountfs(
 	error = xfs_initialize_perag(mp, sbp->sb_agcount, &mp->m_maxagi);
 	if (error) {
 		xfs_warn(mp, "Failed per-ag init: %d", error);
-		goto out_remove_uuid;
+		goto out_free_dir;
 	}
 
 	if (!sbp->sb_logblocks) {
@@ -969,6 +968,8 @@ xfs_mountfs(
 	xfs_wait_buftarg(mp->m_ddev_targp);
  out_free_perag:
 	xfs_free_perag(mp);
+ out_free_dir:
+	xfs_da_unmount(mp);
  out_remove_uuid:
 	xfs_uuid_unmount(mp);
  out:
@@ -1046,6 +1047,7 @@ xfs_unmountfs(
 				"Freespace may not be correct on next mount.");
 
 	xfs_log_unmount(mp);
+	xfs_da_unmount(mp);
 	xfs_uuid_unmount(mp);
 
 #if defined(DEBUG)

fs/xfs/xfs_mount.h

@@ -27,6 +27,7 @@ struct xfs_nameops;
 struct xfs_ail;
 struct xfs_quotainfo;
 struct xfs_dir_ops;
+struct xfs_da_geometry;
 
 #ifdef HAVE_PERCPU_SB
 
@@ -96,6 +97,8 @@ typedef struct xfs_mount {
 	uint			m_readio_blocks; /* min read size blocks */
 	uint			m_writeio_log;	/* min write size log bytes */
 	uint			m_writeio_blocks; /* min write size blocks */
+	struct xfs_da_geometry	*m_dir_geo;	/* directory block geometry */
+	struct xfs_da_geometry	*m_attr_geo;	/* attribute block geometry */
 	struct xlog		*m_log;		/* log specific stuff */
 	int			m_logbufs;	/* number of log buffers */
 	int			m_logbsize;	/* size of each log buffer */