Commit 0650b554 authored by Dave Chinner's avatar Dave Chinner Committed by Dave Chinner
Browse files

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: default avatarDave Chinner <dchinner@redhat.com>
Reviewed-by: default avatarBrian Foster <bfoster@redhat.com>
Signed-off-by: default avatarDave Chinner <david@fromorbit.com>
parent 2d6dcc6d

fs/xfs/xfs_attr.c

+1 −0
Original line number Diff line number Diff line
@@ -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

+2 −0
Original line number Diff line number Diff line
@@ -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

+1 −0
Original line number Diff line number Diff line
@@ -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

+18 −0
Original line number Diff line number Diff line
@@ -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

+60 −13
Original line number Diff line number Diff line
@@ -85,10 +85,11 @@ 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)

{

	struct xfs_da_geometry	*dageo;

	int			nodehdr_size;
@@ -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;

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