patch-2.4.25 linux-2.4.25/fs/xfs/xfs_dir2.c

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diff -urN linux-2.4.24/fs/xfs/xfs_dir2.c linux-2.4.25/fs/xfs/xfs_dir2.c
@@ -0,0 +1,859 @@
+/*
+ * Copyright (c) 2000-2001 Silicon Graphics, Inc.  All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA  94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+
+/*
+ * XFS v2 directory implmentation.
+ * Top-level and utility routines.
+ */
+
+#include "xfs.h"
+
+#include "xfs_macros.h"
+#include "xfs_types.h"
+#include "xfs_inum.h"
+#include "xfs_log.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_ag.h"
+#include "xfs_dir.h"
+#include "xfs_dir2.h"
+#include "xfs_dmapi.h"
+#include "xfs_mount.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_attr_sf.h"
+#include "xfs_dir_sf.h"
+#include "xfs_dir2_sf.h"
+#include "xfs_dinode.h"
+#include "xfs_inode_item.h"
+#include "xfs_inode.h"
+#include "xfs_bmap.h"
+#include "xfs_da_btree.h"
+#include "xfs_dir_leaf.h"
+#include "xfs_dir2_data.h"
+#include "xfs_dir2_leaf.h"
+#include "xfs_dir2_block.h"
+#include "xfs_dir2_node.h"
+#include "xfs_dir2_trace.h"
+#include "xfs_error.h"
+#include "xfs_bit.h"
+
+/*
+ * Declarations for interface routines.
+ */
+static void	xfs_dir2_mount(xfs_mount_t *mp);
+static int	xfs_dir2_isempty(xfs_inode_t *dp);
+static int	xfs_dir2_init(xfs_trans_t *tp, xfs_inode_t *dp,
+			      xfs_inode_t *pdp);
+static int	xfs_dir2_createname(xfs_trans_t *tp, xfs_inode_t *dp,
+				    char *name, int namelen, xfs_ino_t inum,
+				    xfs_fsblock_t *first,
+				    xfs_bmap_free_t *flist, xfs_extlen_t total);
+static int	xfs_dir2_lookup(xfs_trans_t *tp, xfs_inode_t *dp, char *name,
+				int namelen, xfs_ino_t *inum);
+static int	xfs_dir2_removename(xfs_trans_t *tp, xfs_inode_t *dp,
+				    char *name, int namelen, xfs_ino_t ino,
+				    xfs_fsblock_t *first,
+				    xfs_bmap_free_t *flist, xfs_extlen_t total);
+static int	xfs_dir2_getdents(xfs_trans_t *tp, xfs_inode_t *dp, uio_t *uio,
+				  int *eofp);
+static int	xfs_dir2_replace(xfs_trans_t *tp, xfs_inode_t *dp, char *name,
+				 int namelen, xfs_ino_t inum,
+				 xfs_fsblock_t *first, xfs_bmap_free_t *flist,
+				 xfs_extlen_t total);
+static int	xfs_dir2_canenter(xfs_trans_t *tp, xfs_inode_t *dp, char *name,
+				  int namelen);
+static int	xfs_dir2_shortform_validate_ondisk(xfs_mount_t *mp,
+						   xfs_dinode_t *dip);
+
+/*
+ * Utility routine declarations.
+ */
+static int	xfs_dir2_put_dirent64_direct(xfs_dir2_put_args_t *pa);
+static int	xfs_dir2_put_dirent64_uio(xfs_dir2_put_args_t *pa);
+
+/*
+ * Directory operations vector.
+ */
+xfs_dirops_t	xfsv2_dirops = {
+	.xd_mount			= xfs_dir2_mount,
+	.xd_isempty			= xfs_dir2_isempty,
+	.xd_init			= xfs_dir2_init,
+	.xd_createname			= xfs_dir2_createname,
+	.xd_lookup			= xfs_dir2_lookup,
+	.xd_removename			= xfs_dir2_removename,
+	.xd_getdents			= xfs_dir2_getdents,
+	.xd_replace			= xfs_dir2_replace,
+	.xd_canenter			= xfs_dir2_canenter,
+	.xd_shortform_validate_ondisk	= xfs_dir2_shortform_validate_ondisk,
+	.xd_shortform_to_single		= xfs_dir2_sf_to_block,
+};
+
+/*
+ * Interface routines.
+ */
+
+/*
+ * Initialize directory-related fields in the mount structure.
+ */
+static void
+xfs_dir2_mount(
+	xfs_mount_t	*mp)		/* filesystem mount point */
+{
+	mp->m_dirversion = 2;
+	ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
+	       XFS_MAX_BLOCKSIZE);
+	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));
+	mp->m_attr_node_ents =
+		(mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) /
+		(uint)sizeof(xfs_da_node_entry_t);
+	mp->m_dir_node_ents =
+		(mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) /
+		(uint)sizeof(xfs_da_node_entry_t);
+	mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
+}
+
+/*
+ * Return 1 if directory contains only "." and "..".
+ */
+static int				/* return code */
+xfs_dir2_isempty(
+	xfs_inode_t	*dp)		/* incore inode structure */
+{
+	xfs_dir2_sf_t	*sfp;		/* shortform directory structure */
+
+	ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
+	/*
+	 * Might happen during shutdown.
+	 */
+	if (dp->i_d.di_size == 0) {
+		return 1;
+	}
+	if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
+		return 0;
+	sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
+	return INT_ISZERO(sfp->hdr.count, ARCH_CONVERT);
+}
+
+/*
+ * Initialize a directory with its "." and ".." entries.
+ */
+static int				/* error */
+xfs_dir2_init(
+	xfs_trans_t	*tp,		/* transaction pointer */
+	xfs_inode_t	*dp,		/* incore directory inode */
+	xfs_inode_t	*pdp)		/* incore parent directory inode */
+{
+	xfs_da_args_t	args;		/* operation arguments */
+	int		error;		/* error return value */
+
+	memset((char *)&args, 0, sizeof(args));
+	args.dp = dp;
+	args.trans = tp;
+	ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
+	if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino))) {
+		return error;
+	}
+	return xfs_dir2_sf_create(&args, pdp->i_ino);
+}
+
+/*
+  Enter a name in a directory.
+ */
+static int					/* error */
+xfs_dir2_createname(
+	xfs_trans_t		*tp,		/* transaction pointer */
+	xfs_inode_t		*dp,		/* incore directory inode */
+	char			*name,		/* new entry name */
+	int			namelen,	/* new entry name length */
+	xfs_ino_t		inum,		/* new entry inode number */
+	xfs_fsblock_t		*first,		/* bmap's firstblock */
+	xfs_bmap_free_t		*flist,		/* bmap's freeblock list */
+	xfs_extlen_t		total)		/* bmap's total block count */
+{
+	xfs_da_args_t		args;		/* operation arguments */
+	int			rval;		/* return value */
+	int			v;		/* type-checking value */
+
+	ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
+	if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum))) {
+		return rval;
+	}
+	XFS_STATS_INC(xs_dir_create);
+	/*
+	 * Fill in the arg structure for this request.
+	 */
+	args.name = name;
+	args.namelen = namelen;
+	args.hashval = xfs_da_hashname(name, namelen);
+	args.inumber = inum;
+	args.dp = dp;
+	args.firstblock = first;
+	args.flist = flist;
+	args.total = total;
+	args.whichfork = XFS_DATA_FORK;
+	args.trans = tp;
+	args.justcheck = 0;
+	args.addname = args.oknoent = 1;
+	/*
+	 * Decide on what work routines to call based on the inode size.
+	 */
+	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
+		rval = xfs_dir2_sf_addname(&args);
+	else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
+		return rval;
+	} else if (v)
+		rval = xfs_dir2_block_addname(&args);
+	else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
+		return rval;
+	} else if (v)
+		rval = xfs_dir2_leaf_addname(&args);
+	else
+		rval = xfs_dir2_node_addname(&args);
+	return rval;
+}
+
+/*
+ * Lookup a name in a directory, give back the inode number.
+ */
+static int				/* error */
+xfs_dir2_lookup(
+	xfs_trans_t	*tp,		/* transaction pointer */
+	xfs_inode_t	*dp,		/* incore directory inode */
+	char		*name,		/* lookup name */
+	int		namelen,	/* lookup name length */
+	xfs_ino_t	*inum)		/* out: inode number */
+{
+	xfs_da_args_t	args;		/* operation arguments */
+	int		rval;		/* return value */
+	int		v;		/* type-checking value */
+
+	ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
+	XFS_STATS_INC(xs_dir_lookup);
+
+	/*
+	 * Fill in the arg structure for this request.
+	 */
+	args.name = name;
+	args.namelen = namelen;
+	args.hashval = xfs_da_hashname(name, namelen);
+	args.inumber = 0;
+	args.dp = dp;
+	args.firstblock = NULL;
+	args.flist = NULL;
+	args.total = 0;
+	args.whichfork = XFS_DATA_FORK;
+	args.trans = tp;
+	args.justcheck = args.addname = 0;
+	args.oknoent = 1;
+	/*
+	 * Decide on what work routines to call based on the inode size.
+	 */
+	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
+		rval = xfs_dir2_sf_lookup(&args);
+	else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
+		return rval;
+	} else if (v)
+		rval = xfs_dir2_block_lookup(&args);
+	else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
+		return rval;
+	} else if (v)
+		rval = xfs_dir2_leaf_lookup(&args);
+	else
+		rval = xfs_dir2_node_lookup(&args);
+	if (rval == EEXIST)
+		rval = 0;
+	if (rval == 0)
+		*inum = args.inumber;
+	return rval;
+}
+
+/*
+ * Remove an entry from a directory.
+ */
+static int				/* error */
+xfs_dir2_removename(
+	xfs_trans_t	*tp,		/* transaction pointer */
+	xfs_inode_t	*dp,		/* incore directory inode */
+	char		*name,		/* name of entry to remove */
+	int		namelen,	/* name length of entry to remove */
+	xfs_ino_t	ino,		/* inode number of entry to remove */
+	xfs_fsblock_t	*first,		/* bmap's firstblock */
+	xfs_bmap_free_t	*flist,		/* bmap's freeblock list */
+	xfs_extlen_t	total)		/* bmap's total block count */
+{
+	xfs_da_args_t	args;		/* operation arguments */
+	int		rval;		/* return value */
+	int		v;		/* type-checking value */
+
+	ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
+	XFS_STATS_INC(xs_dir_remove);
+	/*
+	 * Fill in the arg structure for this request.
+	 */
+	args.name = name;
+	args.namelen = namelen;
+	args.hashval = xfs_da_hashname(name, namelen);
+	args.inumber = ino;
+	args.dp = dp;
+	args.firstblock = first;
+	args.flist = flist;
+	args.total = total;
+	args.whichfork = XFS_DATA_FORK;
+	args.trans = tp;
+	args.justcheck = args.addname = args.oknoent = 0;
+	/*
+	 * Decide on what work routines to call based on the inode size.
+	 */
+	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
+		rval = xfs_dir2_sf_removename(&args);
+	else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
+		return rval;
+	} else if (v)
+		rval = xfs_dir2_block_removename(&args);
+	else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
+		return rval;
+	} else if (v)
+		rval = xfs_dir2_leaf_removename(&args);
+	else
+		rval = xfs_dir2_node_removename(&args);
+	return rval;
+}
+
+/*
+ * Read a directory.
+ */
+static int				/* error */
+xfs_dir2_getdents(
+	xfs_trans_t	*tp,		/* transaction pointer */
+	xfs_inode_t	*dp,		/* incore directory inode */
+	uio_t		*uio,		/* caller's buffer control */
+	int		*eofp)		/* out: eof reached */
+{
+	int		alignment;	/* alignment required for ABI */
+	xfs_dirent_t	*dbp;		/* malloc'ed buffer */
+	xfs_dir2_put_t	put;		/* entry formatting routine */
+	int		rval;		/* return value */
+	int		v;		/* type-checking value */
+
+	ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
+	XFS_STATS_INC(xs_dir_getdents);
+	/*
+	 * If our caller has given us a single contiguous aligned memory buffer,
+	 * just work directly within that buffer.  If it's in user memory,
+	 * lock it down first.
+	 */
+	alignment = sizeof(xfs_off_t) - 1;
+	if ((uio->uio_iovcnt == 1) &&
+	    (((__psint_t)uio->uio_iov[0].iov_base & alignment) == 0) &&
+	    ((uio->uio_iov[0].iov_len & alignment) == 0)) {
+		dbp = NULL;
+		put = xfs_dir2_put_dirent64_direct;
+	} else {
+		dbp = kmem_alloc(sizeof(*dbp) + MAXNAMELEN, KM_SLEEP);
+		put = xfs_dir2_put_dirent64_uio;
+	}
+
+	*eofp = 0;
+	/*
+	 * Decide on what work routines to call based on the inode size.
+	 */
+	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
+		rval = xfs_dir2_sf_getdents(dp, uio, eofp, dbp, put);
+	else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
+		;
+	} else if (v)
+		rval = xfs_dir2_block_getdents(tp, dp, uio, eofp, dbp, put);
+	else
+		rval = xfs_dir2_leaf_getdents(tp, dp, uio, eofp, dbp, put);
+	if (dbp != NULL)
+		kmem_free(dbp, sizeof(*dbp) + MAXNAMELEN);
+	return rval;
+}
+
+/*
+ * Replace the inode number of a directory entry.
+ */
+static int				/* error */
+xfs_dir2_replace(
+	xfs_trans_t	*tp,		/* transaction pointer */
+	xfs_inode_t	*dp,		/* incore directory inode */
+	char		*name,		/* name of entry to replace */
+	int		namelen,	/* name length of entry to replace */
+	xfs_ino_t	inum,		/* new inode number */
+	xfs_fsblock_t	*first,		/* bmap's firstblock */
+	xfs_bmap_free_t	*flist,		/* bmap's freeblock list */
+	xfs_extlen_t	total)		/* bmap's total block count */
+{
+	xfs_da_args_t	args;		/* operation arguments */
+	int		rval;		/* return value */
+	int		v;		/* type-checking value */
+
+	ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
+
+	if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum))) {
+		return rval;
+	}
+	/*
+	 * Fill in the arg structure for this request.
+	 */
+	args.name = name;
+	args.namelen = namelen;
+	args.hashval = xfs_da_hashname(name, namelen);
+	args.inumber = inum;
+	args.dp = dp;
+	args.firstblock = first;
+	args.flist = flist;
+	args.total = total;
+	args.whichfork = XFS_DATA_FORK;
+	args.trans = tp;
+	args.justcheck = args.addname = args.oknoent = 0;
+	/*
+	 * Decide on what work routines to call based on the inode size.
+	 */
+	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
+		rval = xfs_dir2_sf_replace(&args);
+	else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
+		return rval;
+	} else if (v)
+		rval = xfs_dir2_block_replace(&args);
+	else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
+		return rval;
+	} else if (v)
+		rval = xfs_dir2_leaf_replace(&args);
+	else
+		rval = xfs_dir2_node_replace(&args);
+	return rval;
+}
+
+/*
+ * See if this entry can be added to the directory without allocating space.
+ */
+static int				/* error */
+xfs_dir2_canenter(
+	xfs_trans_t	*tp,		/* transaction pointer */
+	xfs_inode_t	*dp,		/* incore directory inode */
+	char		*name,		/* name of entry to add */
+	int		namelen)	/* name length of entry to add */
+{
+	xfs_da_args_t	args;		/* operation arguments */
+	int		rval;		/* return value */
+	int		v;		/* type-checking value */
+
+	ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
+	/*
+	 * Fill in the arg structure for this request.
+	 */
+	args.name = name;
+	args.namelen = namelen;
+	args.hashval = xfs_da_hashname(name, namelen);
+	args.inumber = 0;
+	args.dp = dp;
+	args.firstblock = NULL;
+	args.flist = NULL;
+	args.total = 0;
+	args.whichfork = XFS_DATA_FORK;
+	args.trans = tp;
+	args.justcheck = args.addname = args.oknoent = 1;
+	/*
+	 * Decide on what work routines to call based on the inode size.
+	 */
+	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
+		rval = xfs_dir2_sf_addname(&args);
+	else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
+		return rval;
+	} else if (v)
+		rval = xfs_dir2_block_addname(&args);
+	else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
+		return rval;
+	} else if (v)
+		rval = xfs_dir2_leaf_addname(&args);
+	else
+		rval = xfs_dir2_node_addname(&args);
+	return rval;
+}
+
+/*
+ * Dummy routine for shortform inode validation.
+ * Can't really do this.
+ */
+/* ARGSUSED */
+static int				/* error */
+xfs_dir2_shortform_validate_ondisk(
+	xfs_mount_t	*mp,		/* filesystem mount point */
+	xfs_dinode_t	*dip)		/* ondisk inode */
+{
+	return 0;
+}
+
+/*
+ * Utility routines.
+ */
+
+/*
+ * Add a block to the directory.
+ * This routine is for data and free blocks, not leaf/node blocks
+ * which are handled by xfs_da_grow_inode.
+ */
+int					/* error */
+xfs_dir2_grow_inode(
+	xfs_da_args_t	*args,		/* operation arguments */
+	int		space,		/* v2 dir's space XFS_DIR2_xxx_SPACE */
+	xfs_dir2_db_t	*dbp)		/* out: block number added */
+{
+	xfs_fileoff_t	bno;		/* directory offset of new block */
+	int		count;		/* count of filesystem blocks */
+	xfs_inode_t	*dp;		/* incore directory inode */
+	int		error;		/* error return value */
+	int		got;		/* blocks actually mapped */
+	int		i;		/* temp mapping index */
+	xfs_bmbt_irec_t	map;		/* single structure for bmap */
+	int		mapi;		/* mapping index */
+	xfs_bmbt_irec_t	*mapp;		/* bmap mapping structure(s) */
+	xfs_mount_t	*mp;		/* filesystem mount point */
+	int		nmap;		/* number of bmap entries */
+	xfs_trans_t	*tp;		/* transaction pointer */
+
+	xfs_dir2_trace_args_s("grow_inode", args, space);
+	dp = args->dp;
+	tp = args->trans;
+	mp = dp->i_mount;
+	/*
+	 * Set lowest possible block in the space requested.
+	 */
+	bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
+	count = mp->m_dirblkfsbs;
+	/*
+	 * Find the first hole for our block.
+	 */
+	if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, XFS_DATA_FORK))) {
+		return error;
+	}
+	nmap = 1;
+	ASSERT(args->firstblock != NULL);
+	/*
+	 * Try mapping the new block contiguously (one extent).
+	 */
+	if ((error = xfs_bmapi(tp, dp, bno, count,
+			XFS_BMAPI_WRITE|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG,
+			args->firstblock, args->total, &map, &nmap,
+			args->flist))) {
+		return error;
+	}
+	ASSERT(nmap <= 1);
+	/*
+	 * Got it in 1.
+	 */
+	if (nmap == 1) {
+		mapp = &map;
+		mapi = 1;
+	}
+	/*
+	 * Didn't work and this is a multiple-fsb directory block.
+	 * Try again with contiguous flag turned on.
+	 */
+	else if (nmap == 0 && count > 1) {
+		xfs_fileoff_t	b;	/* current file offset */
+
+		/*
+		 * Space for maximum number of mappings.
+		 */
+		mapp = kmem_alloc(sizeof(*mapp) * count, KM_SLEEP);
+		/*
+		 * Iterate until we get to the end of our block.
+		 */
+		for (b = bno, mapi = 0; b < bno + count; ) {
+			int	c;	/* current fsb count */
+
+			/*
+			 * Can't map more than MAX_NMAP at once.
+			 */
+			nmap = MIN(XFS_BMAP_MAX_NMAP, count);
+			c = (int)(bno + count - b);
+			if ((error = xfs_bmapi(tp, dp, b, c,
+					XFS_BMAPI_WRITE|XFS_BMAPI_METADATA,
+					args->firstblock, args->total,
+					&mapp[mapi], &nmap, args->flist))) {
+				kmem_free(mapp, sizeof(*mapp) * count);
+				return error;
+			}
+			if (nmap < 1)
+				break;
+			/*
+			 * Add this bunch into our table, go to the next offset.
+			 */
+			mapi += nmap;
+			b = mapp[mapi - 1].br_startoff +
+			    mapp[mapi - 1].br_blockcount;
+		}
+	}
+	/*
+	 * Didn't work.
+	 */
+	else {
+		mapi = 0;
+		mapp = NULL;
+	}
+	/*
+	 * See how many fsb's we got.
+	 */
+	for (i = 0, got = 0; i < mapi; i++)
+		got += mapp[i].br_blockcount;
+	/*
+	 * Didn't get enough fsb's, or the first/last block's are wrong.
+	 */
+	if (got != count || mapp[0].br_startoff != bno ||
+	    mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount !=
+	    bno + count) {
+		if (mapp != &map)
+			kmem_free(mapp, sizeof(*mapp) * count);
+		return XFS_ERROR(ENOSPC);
+	}
+	/*
+	 * Done with the temporary mapping table.
+	 */
+	if (mapp != &map)
+		kmem_free(mapp, sizeof(*mapp) * count);
+	*dbp = XFS_DIR2_DA_TO_DB(mp, (xfs_dablk_t)bno);
+	/*
+	 * Update file's size if this is the data space and it grew.
+	 */
+	if (space == XFS_DIR2_DATA_SPACE) {
+		xfs_fsize_t	size;		/* directory file (data) size */
+
+		size = XFS_FSB_TO_B(mp, bno + count);
+		if (size > dp->i_d.di_size) {
+			dp->i_d.di_size = size;
+			xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
+		}
+	}
+	return 0;
+}
+
+/*
+ * See if the directory is a single-block form directory.
+ */
+int					/* error */
+xfs_dir2_isblock(
+	xfs_trans_t	*tp,		/* transaction pointer */
+	xfs_inode_t	*dp,		/* incore directory inode */
+	int		*vp)		/* out: 1 is block, 0 is not block */
+{
+	xfs_fileoff_t	last;		/* last file offset */
+	xfs_mount_t	*mp;		/* filesystem mount point */
+	int		rval;		/* return value */
+
+	mp = dp->i_mount;
+	if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK))) {
+		return rval;
+	}
+	rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
+	ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
+	*vp = rval;
+	return 0;
+}
+
+/*
+ * See if the directory is a single-leaf form directory.
+ */
+int					/* error */
+xfs_dir2_isleaf(
+	xfs_trans_t	*tp,		/* transaction pointer */
+	xfs_inode_t	*dp,		/* incore directory inode */
+	int		*vp)		/* out: 1 is leaf, 0 is not leaf */
+{
+	xfs_fileoff_t	last;		/* last file offset */
+	xfs_mount_t	*mp;		/* filesystem mount point */
+	int		rval;		/* return value */
+
+	mp = dp->i_mount;
+	if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK))) {
+		return rval;
+	}
+	*vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
+	return 0;
+}
+
+/*
+ * Getdents put routine for 64-bit ABI, direct form.
+ */
+static int					/* error */
+xfs_dir2_put_dirent64_direct(
+	xfs_dir2_put_args_t	*pa)		/* argument bundle */
+{
+	xfs_dirent_t		*idbp;		/* dirent pointer */
+	iovec_t			*iovp;		/* io vector */
+	int			namelen;	/* entry name length */
+	int			reclen;		/* entry total length */
+	uio_t			*uio;		/* I/O control */
+
+	namelen = pa->namelen;
+	reclen = DIRENTSIZE(namelen);
+	uio = pa->uio;
+	/*
+	 * Won't fit in the remaining space.
+	 */
+	if (reclen > uio->uio_resid) {
+		pa->done = 0;
+		return 0;
+	}
+	iovp = uio->uio_iov;
+	idbp = (xfs_dirent_t *)iovp->iov_base;
+	iovp->iov_base = (char *)idbp + reclen;
+	iovp->iov_len -= reclen;
+	uio->uio_resid -= reclen;
+	idbp->d_reclen = reclen;
+	idbp->d_ino = pa->ino;
+	idbp->d_off = pa->cook;
+	idbp->d_name[namelen] = '\0';
+	pa->done = 1;
+	memcpy(idbp->d_name, pa->name, namelen);
+	return 0;
+}
+
+/*
+ * Getdents put routine for 64-bit ABI, uio form.
+ */
+static int					/* error */
+xfs_dir2_put_dirent64_uio(
+	xfs_dir2_put_args_t	*pa)		/* argument bundle */
+{
+	xfs_dirent_t		*idbp;		/* dirent pointer */
+	int			namelen;	/* entry name length */
+	int			reclen;		/* entry total length */
+	int			rval;		/* return value */
+	uio_t			*uio;		/* I/O control */
+
+	namelen = pa->namelen;
+	reclen = DIRENTSIZE(namelen);
+	uio = pa->uio;
+	/*
+	 * Won't fit in the remaining space.
+	 */
+	if (reclen > uio->uio_resid) {
+		pa->done = 0;
+		return 0;
+	}
+	idbp = pa->dbp;
+	idbp->d_reclen = reclen;
+	idbp->d_ino = pa->ino;
+	idbp->d_off = pa->cook;
+	idbp->d_name[namelen] = '\0';
+	memcpy(idbp->d_name, pa->name, namelen);
+	rval = uio_read((caddr_t)idbp, reclen, uio);
+	pa->done = (rval == 0);
+	return rval;
+}
+
+/*
+ * Remove the given block from the directory.
+ * This routine is used for data and free blocks, leaf/node are done
+ * by xfs_da_shrink_inode.
+ */
+int
+xfs_dir2_shrink_inode(
+	xfs_da_args_t	*args,		/* operation arguments */
+	xfs_dir2_db_t	db,		/* directory block number */
+	xfs_dabuf_t	*bp)		/* block's buffer */
+{
+	xfs_fileoff_t	bno;		/* directory file offset */
+	xfs_dablk_t	da;		/* directory file offset */
+	int		done;		/* bunmap is finished */
+	xfs_inode_t	*dp;		/* incore directory inode */
+	int		error;		/* error return value */
+	xfs_mount_t	*mp;		/* filesystem mount point */
+	xfs_trans_t	*tp;		/* transaction pointer */
+
+	xfs_dir2_trace_args_db("shrink_inode", args, db, bp);
+	dp = args->dp;
+	mp = dp->i_mount;
+	tp = args->trans;
+	da = XFS_DIR2_DB_TO_DA(mp, db);
+	/*
+	 * Unmap the fsblock(s).
+	 */
+	if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
+			XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
+			&done))) {
+		/*
+		 * ENOSPC actually can happen if we're in a removename with
+		 * no space reservation, and the resulting block removal
+		 * would cause a bmap btree split or conversion from extents
+		 * to btree.  This can only happen for un-fragmented
+		 * directory blocks, since you need to be punching out
+		 * the middle of an extent.
+		 * In this case we need to leave the block in the file,
+		 * and not binval it.
+		 * So the block has to be in a consistent empty state
+		 * and appropriately logged.
+		 * We don't free up the buffer, the caller can tell it
+		 * hasn't happened since it got an error back.
+		 */
+		return error;
+	}
+	ASSERT(done);
+	/*
+	 * Invalidate the buffer from the transaction.
+	 */
+	xfs_da_binval(tp, bp);
+	/*
+	 * If it's not a data block, we're done.
+	 */
+	if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
+		return 0;
+	/*
+	 * If the block isn't the last one in the directory, we're done.
+	 */
+	if (dp->i_d.di_size > XFS_DIR2_DB_OFF_TO_BYTE(mp, db + 1, 0))
+		return 0;
+	bno = da;
+	if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
+		/*
+		 * This can't really happen unless there's kernel corruption.
+		 */
+		return error;
+	}
+	if (db == mp->m_dirdatablk)
+		ASSERT(bno == 0);
+	else
+		ASSERT(bno > 0);
+	/*
+	 * Set the size to the new last block.
+	 */
+	dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
+	xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
+	return 0;
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)