[mirror_ubuntu-bionic-kernel.git] / fs / xfs / xfs_dir2.c

/*
 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms 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.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_types.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_da_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_inode_item.h"
#include "xfs_bmap.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_vnodeops.h"


void
xfs_dir_mount(
	xfs_mount_t	*mp)
{
	ASSERT(XFS_SB_VERSION_HASDIRV2(&mp->m_sb));
	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 "..".
 */
int
xfs_dir_isempty(
	xfs_inode_t	*dp)
{
	xfs_dir2_sf_t	*sfp;

	ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
	if (dp->i_d.di_size == 0)	/* might happen during shutdown. */
		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 !sfp->hdr.count;
}

/*
 * Validate a given inode number.
 */
int
xfs_dir_ino_validate(
	xfs_mount_t	*mp,
	xfs_ino_t	ino)
{
	xfs_agblock_t	agblkno;
	xfs_agino_t	agino;
	xfs_agnumber_t	agno;
	int		ino_ok;
	int		ioff;

	agno = XFS_INO_TO_AGNO(mp, ino);
	agblkno = XFS_INO_TO_AGBNO(mp, ino);
	ioff = XFS_INO_TO_OFFSET(mp, ino);
	agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
	ino_ok =
		agno < mp->m_sb.sb_agcount &&
		agblkno < mp->m_sb.sb_agblocks &&
		agblkno != 0 &&
		ioff < (1 << mp->m_sb.sb_inopblog) &&
		XFS_AGINO_TO_INO(mp, agno, agino) == ino;
	if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
			XFS_RANDOM_DIR_INO_VALIDATE))) {
		xfs_fs_cmn_err(CE_WARN, mp, "Invalid inode number 0x%Lx",
				(unsigned long long) ino);
		XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
		return XFS_ERROR(EFSCORRUPTED);
	}
	return 0;
}

/*
 * Initialize a directory with its "." and ".." entries.
 */
int
xfs_dir_init(
	xfs_trans_t	*tp,
	xfs_inode_t	*dp,
	xfs_inode_t	*pdp)
{
	xfs_da_args_t	args;
	int		error;

	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.
 */
int
xfs_dir_createname(
	xfs_trans_t		*tp,
	xfs_inode_t		*dp,
	char			*name,
	int			namelen,
	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;
	int			rval;
	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);

	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;

	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.
 */
int
xfs_dir_lookup(
	xfs_trans_t	*tp,
	xfs_inode_t	*dp,
	char		*name,
	int		namelen,
	xfs_ino_t	*inum)		/* out: inode number */
{
	xfs_da_args_t	args;
	int		rval;
	int		v;		/* type-checking value */

	ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
	XFS_STATS_INC(xs_dir_lookup);

	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;

	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.
 */
int
xfs_dir_removename(
	xfs_trans_t	*tp,
	xfs_inode_t	*dp,
	char		*name,
	int		namelen,
	xfs_ino_t	ino,
	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;
	int		rval;
	int		v;		/* type-checking value */

	ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
	XFS_STATS_INC(xs_dir_remove);

	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;

	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.
 */
int
xfs_readdir(
	xfs_inode_t	*dp,
	void		*dirent,
	size_t		bufsize,
	xfs_off_t	*offset,
	filldir_t	filldir)
{
	int		rval;		/* return value */
	int		v;		/* type-checking value */

	xfs_itrace_entry(dp);

	if (XFS_FORCED_SHUTDOWN(dp->i_mount))
		return XFS_ERROR(EIO);

	ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
	XFS_STATS_INC(xs_dir_getdents);

	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
		rval = xfs_dir2_sf_getdents(dp, dirent, offset, filldir);
	else if ((rval = xfs_dir2_isblock(NULL, dp, &v)))
		;
	else if (v)
		rval = xfs_dir2_block_getdents(dp, dirent, offset, filldir);
	else
		rval = xfs_dir2_leaf_getdents(dp, dirent, bufsize, offset,
					      filldir);
	return rval;
}

/*
 * Replace the inode number of a directory entry.
 */
int
xfs_dir_replace(
	xfs_trans_t	*tp,
	xfs_inode_t	*dp,
	char		*name,		/* name of entry to replace */
	int		namelen,
	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;
	int		rval;
	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;

	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;

	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.
 */
int
xfs_dir_canenter(
	xfs_trans_t	*tp,
	xfs_inode_t	*dp,
	char		*name,		/* name of entry to add */
	int		namelen)
{
	xfs_da_args_t	args;
	int		rval;
	int		v;		/* type-checking value */

	ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);

	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;

	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;
}

/*
 * 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
xfs_dir2_grow_inode(
	xfs_da_args_t	*args,
	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;
	int		got;		/* blocks actually mapped */
	int		i;
	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;
	int		nmap;		/* number of bmap entries */
	xfs_trans_t	*tp;

	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, NULL)))
		return error;
	ASSERT(nmap <= 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,
					NULL))) {
				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
xfs_dir2_isblock(
	xfs_trans_t	*tp,
	xfs_inode_t	*dp,
	int		*vp)		/* out: 1 is block, 0 is not block */
{
	xfs_fileoff_t	last;		/* last file offset */
	xfs_mount_t	*mp;
	int		rval;

	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
xfs_dir2_isleaf(
	xfs_trans_t	*tp,
	xfs_inode_t	*dp,
	int		*vp)		/* out: 1 is leaf, 0 is not leaf */
{
	xfs_fileoff_t	last;		/* last file offset */
	xfs_mount_t	*mp;
	int		rval;

	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;
}

/*
 * 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,
	xfs_dir2_db_t	db,
	xfs_dabuf_t	*bp)
{
	xfs_fileoff_t	bno;		/* directory file offset */
	xfs_dablk_t	da;		/* directory file offset */
	int		done;		/* bunmap is finished */
	xfs_inode_t	*dp;
	int		error;
	xfs_mount_t	*mp;
	xfs_trans_t	*tp;

	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,
			NULL, &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;
}
Commit	Line	Data
1da177e4	1	/*
7b718769 NS	2	* Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
7b718769 NS	3	* All Rights Reserved.
1da177e4	4	*
7b718769 NS	5	* This program is free software; you can redistribute it and/or
7b718769 NS	6	* modify it under the terms of the GNU General Public License as
1da177e4 LT	7	* published by the Free Software Foundation.
1da177e4 LT	8	*
7b718769 NS	9	* This program is distributed in the hope that it would be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
1da177e4	13	*
7b718769 NS	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write the Free Software Foundation,
	16	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1da177e4	17	*/
1da177e4	18	#include "xfs.h"
a844f451	19	#include "xfs_fs.h"
1da177e4	20	#include "xfs_types.h"
a844f451	21	#include "xfs_bit.h"
1da177e4	22	#include "xfs_log.h"
a844f451	23	#include "xfs_inum.h"
1da177e4 LT	24	#include "xfs_trans.h"
	25	#include "xfs_sb.h"
	26	#include "xfs_ag.h"
1da177e4 LT	27	#include "xfs_dir2.h"
	28	#include "xfs_dmapi.h"
	29	#include "xfs_mount.h"
a844f451	30	#include "xfs_da_btree.h"
1da177e4	31	#include "xfs_bmap_btree.h"
a844f451	32	#include "xfs_alloc_btree.h"
1da177e4	33	#include "xfs_dir2_sf.h"
a844f451	34	#include "xfs_attr_sf.h"
1da177e4	35	#include "xfs_dinode.h"
1da177e4	36	#include "xfs_inode.h"
a844f451	37	#include "xfs_inode_item.h"
1da177e4	38	#include "xfs_bmap.h"
1da177e4 LT	39	#include "xfs_dir2_data.h"
	40	#include "xfs_dir2_leaf.h"
	41	#include "xfs_dir2_block.h"
	42	#include "xfs_dir2_node.h"
	43	#include "xfs_dir2_trace.h"
	44	#include "xfs_error.h"
a8272ce0	45	#include "xfs_vnodeops.h"
1da177e4	46
1da177e4	47
f6c2d1fa NS	48	void
	49	xfs_dir_mount(
	50	xfs_mount_t *mp)
1da177e4	51	{
f6c2d1fa	52	ASSERT(XFS_SB_VERSION_HASDIRV2(&mp->m_sb));
1da177e4 LT	53	ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
	54	XFS_MAX_BLOCKSIZE);
	55	mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
	56	mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
bbaaf538 CH	57	mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
	58	mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
	59	mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));
1da177e4 LT	60	mp->m_attr_node_ents =
	61	(mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) /
	62	(uint)sizeof(xfs_da_node_entry_t);
	63	mp->m_dir_node_ents =
	64	(mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) /
	65	(uint)sizeof(xfs_da_node_entry_t);
	66	mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
	67	}
	68
	69	/*
	70	* Return 1 if directory contains only "." and "..".
	71	*/
f6c2d1fa NS	72	int
	73	xfs_dir_isempty(
	74	xfs_inode_t *dp)
1da177e4	75	{
f6c2d1fa	76	xfs_dir2_sf_t *sfp;
1da177e4 LT	77
1da177e4 LT	78	ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
f6c2d1fa	79	if (dp->i_d.di_size == 0) /* might happen during shutdown. */
1da177e4	80	return 1;
1da177e4 LT	81	if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
	82	return 0;
	83	sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
	84	return !sfp->hdr.count;
	85	}
	86
f6c2d1fa NS	87	/*
	88	* Validate a given inode number.
	89	*/
	90	int
	91	xfs_dir_ino_validate(
	92	xfs_mount_t *mp,
	93	xfs_ino_t ino)
	94	{
	95	xfs_agblock_t agblkno;
	96	xfs_agino_t agino;
	97	xfs_agnumber_t agno;
	98	int ino_ok;
	99	int ioff;
	100
	101	agno = XFS_INO_TO_AGNO(mp, ino);
	102	agblkno = XFS_INO_TO_AGBNO(mp, ino);
	103	ioff = XFS_INO_TO_OFFSET(mp, ino);
	104	agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
	105	ino_ok =
	106	agno < mp->m_sb.sb_agcount &&
	107	agblkno < mp->m_sb.sb_agblocks &&
	108	agblkno != 0 &&
	109	ioff < (1 << mp->m_sb.sb_inopblog) &&
	110	XFS_AGINO_TO_INO(mp, agno, agino) == ino;
	111	if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
	112	XFS_RANDOM_DIR_INO_VALIDATE))) {
	113	xfs_fs_cmn_err(CE_WARN, mp, "Invalid inode number 0x%Lx",
	114	(unsigned long long) ino);
	115	XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
	116	return XFS_ERROR(EFSCORRUPTED);
	117	}
	118	return 0;
	119	}
	120
1da177e4 LT	121	/*
	122	* Initialize a directory with its "." and ".." entries.
	123	*/
f6c2d1fa NS	124	int
	125	xfs_dir_init(
	126	xfs_trans_t *tp,
	127	xfs_inode_t *dp,
	128	xfs_inode_t *pdp)
1da177e4	129	{
f6c2d1fa NS	130	xfs_da_args_t args;
f6c2d1fa NS	131	int error;
1da177e4 LT	132
	133	memset((char *)&args, 0, sizeof(args));
	134	args.dp = dp;
	135	args.trans = tp;
	136	ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
f6c2d1fa	137	if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
1da177e4	138	return error;
1da177e4 LT	139	return xfs_dir2_sf_create(&args, pdp->i_ino);
	140	}
	141
	142	/*
	143	Enter a name in a directory.
	144	*/
f6c2d1fa NS	145	int
	146	xfs_dir_createname(
	147	xfs_trans_t *tp,
	148	xfs_inode_t *dp,
	149	char *name,
	150	int namelen,
1da177e4 LT	151	xfs_ino_t inum, /* new entry inode number */
	152	xfs_fsblock_t first, / bmap's firstblock */
	153	xfs_bmap_free_t flist, / bmap's freeblock list */
	154	xfs_extlen_t total) /* bmap's total block count */
	155	{
f6c2d1fa NS	156	xfs_da_args_t args;
f6c2d1fa NS	157	int rval;
1da177e4 LT	158	int v; /* type-checking value */
	159
	160	ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
f6c2d1fa	161	if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
1da177e4	162	return rval;
1da177e4	163	XFS_STATS_INC(xs_dir_create);
f6c2d1fa	164
1da177e4 LT	165	args.name = name;
	166	args.namelen = namelen;
	167	args.hashval = xfs_da_hashname(name, namelen);
	168	args.inumber = inum;
	169	args.dp = dp;
	170	args.firstblock = first;
	171	args.flist = flist;
	172	args.total = total;
	173	args.whichfork = XFS_DATA_FORK;
	174	args.trans = tp;
	175	args.justcheck = 0;
	176	args.addname = args.oknoent = 1;
f6c2d1fa	177
1da177e4 LT	178	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
1da177e4 LT	179	rval = xfs_dir2_sf_addname(&args);
f6c2d1fa	180	else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
1da177e4	181	return rval;
f6c2d1fa	182	else if (v)
1da177e4	183	rval = xfs_dir2_block_addname(&args);
f6c2d1fa	184	else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
1da177e4	185	return rval;
f6c2d1fa	186	else if (v)
1da177e4 LT	187	rval = xfs_dir2_leaf_addname(&args);
	188	else
	189	rval = xfs_dir2_node_addname(&args);
	190	return rval;
	191	}
	192
	193	/*
	194	* Lookup a name in a directory, give back the inode number.
	195	*/
f6c2d1fa NS	196	int
	197	xfs_dir_lookup(
	198	xfs_trans_t *tp,
	199	xfs_inode_t *dp,
	200	char *name,
	201	int namelen,
1da177e4 LT	202	xfs_ino_t inum) / out: inode number */
1da177e4 LT	203	{
f6c2d1fa NS	204	xfs_da_args_t args;
f6c2d1fa NS	205	int rval;
1da177e4 LT	206	int v; /* type-checking value */
	207
	208	ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
	209	XFS_STATS_INC(xs_dir_lookup);
	210
1da177e4 LT	211	args.name = name;
	212	args.namelen = namelen;
	213	args.hashval = xfs_da_hashname(name, namelen);
	214	args.inumber = 0;
	215	args.dp = dp;
	216	args.firstblock = NULL;
	217	args.flist = NULL;
	218	args.total = 0;
	219	args.whichfork = XFS_DATA_FORK;
	220	args.trans = tp;
	221	args.justcheck = args.addname = 0;
	222	args.oknoent = 1;
f6c2d1fa	223
1da177e4 LT	224	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
1da177e4 LT	225	rval = xfs_dir2_sf_lookup(&args);
f6c2d1fa	226	else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
1da177e4	227	return rval;
f6c2d1fa	228	else if (v)
1da177e4	229	rval = xfs_dir2_block_lookup(&args);
f6c2d1fa	230	else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
1da177e4	231	return rval;
f6c2d1fa	232	else if (v)
1da177e4 LT	233	rval = xfs_dir2_leaf_lookup(&args);
	234	else
	235	rval = xfs_dir2_node_lookup(&args);
	236	if (rval == EEXIST)
	237	rval = 0;
	238	if (rval == 0)
	239	*inum = args.inumber;
	240	return rval;
	241	}
	242
	243	/*
	244	* Remove an entry from a directory.
	245	*/
f6c2d1fa NS	246	int
	247	xfs_dir_removename(
	248	xfs_trans_t *tp,
	249	xfs_inode_t *dp,
	250	char *name,
	251	int namelen,
	252	xfs_ino_t ino,
1da177e4 LT	253	xfs_fsblock_t first, / bmap's firstblock */
	254	xfs_bmap_free_t flist, / bmap's freeblock list */
	255	xfs_extlen_t total) /* bmap's total block count */
	256	{
f6c2d1fa NS	257	xfs_da_args_t args;
f6c2d1fa NS	258	int rval;
1da177e4 LT	259	int v; /* type-checking value */
	260
	261	ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
	262	XFS_STATS_INC(xs_dir_remove);
f6c2d1fa	263
1da177e4 LT	264	args.name = name;
	265	args.namelen = namelen;
	266	args.hashval = xfs_da_hashname(name, namelen);
	267	args.inumber = ino;
	268	args.dp = dp;
	269	args.firstblock = first;
	270	args.flist = flist;
	271	args.total = total;
	272	args.whichfork = XFS_DATA_FORK;
	273	args.trans = tp;
	274	args.justcheck = args.addname = args.oknoent = 0;
f6c2d1fa	275
1da177e4 LT	276	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
1da177e4 LT	277	rval = xfs_dir2_sf_removename(&args);
f6c2d1fa	278	else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
1da177e4	279	return rval;
f6c2d1fa	280	else if (v)
1da177e4	281	rval = xfs_dir2_block_removename(&args);
f6c2d1fa	282	else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
1da177e4	283	return rval;
f6c2d1fa	284	else if (v)
1da177e4 LT	285	rval = xfs_dir2_leaf_removename(&args);
	286	else
	287	rval = xfs_dir2_node_removename(&args);
	288	return rval;
	289	}
	290
	291	/*
	292	* Read a directory.
	293	*/
f6c2d1fa	294	int
051e7cd4	295	xfs_readdir(
993386c1	296	xfs_inode_t *dp,
051e7cd4 CH	297	void *dirent,
	298	size_t bufsize,
	299	xfs_off_t *offset,
	300	filldir_t filldir)
1da177e4	301	{
1da177e4 LT	302	int rval; /* return value */
	303	int v; /* type-checking value */
	304
cf441eeb	305	xfs_itrace_entry(dp);
051e7cd4 CH	306
	307	if (XFS_FORCED_SHUTDOWN(dp->i_mount))
	308	return XFS_ERROR(EIO);
	309
1da177e4 LT	310	ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
1da177e4 LT	311	XFS_STATS_INC(xs_dir_getdents);
1da177e4	312
1da177e4	313	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
051e7cd4 CH	314	rval = xfs_dir2_sf_getdents(dp, dirent, offset, filldir);
051e7cd4 CH	315	else if ((rval = xfs_dir2_isblock(NULL, dp, &v)))
1da177e4	316	;
f6c2d1fa	317	else if (v)
051e7cd4	318	rval = xfs_dir2_block_getdents(dp, dirent, offset, filldir);
1da177e4	319	else
051e7cd4 CH	320	rval = xfs_dir2_leaf_getdents(dp, dirent, bufsize, offset,
051e7cd4 CH	321	filldir);
1da177e4 LT	322	return rval;
	323	}
	324
	325	/*
	326	* Replace the inode number of a directory entry.
	327	*/
f6c2d1fa NS	328	int
	329	xfs_dir_replace(
	330	xfs_trans_t *tp,
	331	xfs_inode_t *dp,
1da177e4	332	char name, / name of entry to replace */
f6c2d1fa	333	int namelen,
1da177e4 LT	334	xfs_ino_t inum, /* new inode number */
	335	xfs_fsblock_t first, / bmap's firstblock */
	336	xfs_bmap_free_t flist, / bmap's freeblock list */
	337	xfs_extlen_t total) /* bmap's total block count */
	338	{
f6c2d1fa NS	339	xfs_da_args_t args;
f6c2d1fa NS	340	int rval;
1da177e4 LT	341	int v; /* type-checking value */
	342
	343	ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
	344
f6c2d1fa	345	if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
1da177e4	346	return rval;
f6c2d1fa	347
1da177e4 LT	348	args.name = name;
	349	args.namelen = namelen;
	350	args.hashval = xfs_da_hashname(name, namelen);
	351	args.inumber = inum;
	352	args.dp = dp;
	353	args.firstblock = first;
	354	args.flist = flist;
	355	args.total = total;
	356	args.whichfork = XFS_DATA_FORK;
	357	args.trans = tp;
	358	args.justcheck = args.addname = args.oknoent = 0;
f6c2d1fa	359
1da177e4 LT	360	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
1da177e4 LT	361	rval = xfs_dir2_sf_replace(&args);
f6c2d1fa	362	else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
1da177e4	363	return rval;
f6c2d1fa	364	else if (v)
1da177e4	365	rval = xfs_dir2_block_replace(&args);
f6c2d1fa	366	else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
1da177e4	367	return rval;
f6c2d1fa	368	else if (v)
1da177e4 LT	369	rval = xfs_dir2_leaf_replace(&args);
	370	else
	371	rval = xfs_dir2_node_replace(&args);
	372	return rval;
	373	}
	374
	375	/*
	376	* See if this entry can be added to the directory without allocating space.
	377	*/
f6c2d1fa NS	378	int
	379	xfs_dir_canenter(
	380	xfs_trans_t *tp,
	381	xfs_inode_t *dp,
1da177e4	382	char name, / name of entry to add */
f6c2d1fa	383	int namelen)
1da177e4	384	{
f6c2d1fa NS	385	xfs_da_args_t args;
f6c2d1fa NS	386	int rval;
1da177e4 LT	387	int v; /* type-checking value */
	388
	389	ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
f6c2d1fa	390
1da177e4 LT	391	args.name = name;
	392	args.namelen = namelen;
	393	args.hashval = xfs_da_hashname(name, namelen);
	394	args.inumber = 0;
	395	args.dp = dp;
	396	args.firstblock = NULL;
	397	args.flist = NULL;
	398	args.total = 0;
	399	args.whichfork = XFS_DATA_FORK;
	400	args.trans = tp;
	401	args.justcheck = args.addname = args.oknoent = 1;
f6c2d1fa	402
1da177e4 LT	403	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
1da177e4 LT	404	rval = xfs_dir2_sf_addname(&args);
f6c2d1fa	405	else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
1da177e4	406	return rval;
f6c2d1fa	407	else if (v)
1da177e4	408	rval = xfs_dir2_block_addname(&args);
f6c2d1fa	409	else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
1da177e4	410	return rval;
f6c2d1fa	411	else if (v)
1da177e4 LT	412	rval = xfs_dir2_leaf_addname(&args);
	413	else
	414	rval = xfs_dir2_node_addname(&args);
	415	return rval;
	416	}
	417
1da177e4 LT	418	/*
	419	* Utility routines.
	420	*/
	421
	422	/*
	423	* Add a block to the directory.
	424	* This routine is for data and free blocks, not leaf/node blocks
	425	* which are handled by xfs_da_grow_inode.
	426	*/
f6c2d1fa	427	int
1da177e4	428	xfs_dir2_grow_inode(
f6c2d1fa	429	xfs_da_args_t *args,
1da177e4 LT	430	int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
	431	xfs_dir2_db_t dbp) / out: block number added */
	432	{
	433	xfs_fileoff_t bno; /* directory offset of new block */
	434	int count; /* count of filesystem blocks */
	435	xfs_inode_t dp; / incore directory inode */
f6c2d1fa	436	int error;
1da177e4	437	int got; /* blocks actually mapped */
f6c2d1fa	438	int i;
1da177e4 LT	439	xfs_bmbt_irec_t map; /* single structure for bmap */
	440	int mapi; /* mapping index */
	441	xfs_bmbt_irec_t mapp; / bmap mapping structure(s) */
f6c2d1fa	442	xfs_mount_t *mp;
1da177e4	443	int nmap; /* number of bmap entries */
f6c2d1fa	444	xfs_trans_t *tp;
1da177e4 LT	445
	446	xfs_dir2_trace_args_s("grow_inode", args, space);
	447	dp = args->dp;
	448	tp = args->trans;
	449	mp = dp->i_mount;
	450	/*
	451	* Set lowest possible block in the space requested.
	452	*/
	453	bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
	454	count = mp->m_dirblkfsbs;
	455	/*
	456	* Find the first hole for our block.
	457	*/
f6c2d1fa	458	if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, XFS_DATA_FORK)))
1da177e4	459	return error;
1da177e4 LT	460	nmap = 1;
	461	ASSERT(args->firstblock != NULL);
	462	/*
	463	* Try mapping the new block contiguously (one extent).
	464	*/
	465	if ((error = xfs_bmapi(tp, dp, bno, count,
	466	XFS_BMAPI_WRITE\|XFS_BMAPI_METADATA\|XFS_BMAPI_CONTIG,
	467	args->firstblock, args->total, &map, &nmap,
f6c2d1fa	468	args->flist, NULL)))
1da177e4	469	return error;
1da177e4	470	ASSERT(nmap <= 1);
1da177e4 LT	471	if (nmap == 1) {
	472	mapp = &map;
	473	mapi = 1;
	474	}
	475	/*
	476	* Didn't work and this is a multiple-fsb directory block.
	477	* Try again with contiguous flag turned on.
	478	*/
	479	else if (nmap == 0 && count > 1) {
	480	xfs_fileoff_t b; /* current file offset */
	481
	482	/*
	483	* Space for maximum number of mappings.
	484	*/
	485	mapp = kmem_alloc(sizeof(mapp) count, KM_SLEEP);
	486	/*
	487	* Iterate until we get to the end of our block.
	488	*/
	489	for (b = bno, mapi = 0; b < bno + count; ) {
	490	int c; /* current fsb count */
	491
	492	/*
	493	* Can't map more than MAX_NMAP at once.
	494	*/
	495	nmap = MIN(XFS_BMAP_MAX_NMAP, count);
	496	c = (int)(bno + count - b);
	497	if ((error = xfs_bmapi(tp, dp, b, c,
	498	XFS_BMAPI_WRITE\|XFS_BMAPI_METADATA,
	499	args->firstblock, args->total,
3e57ecf6 OW	500	&mapp[mapi], &nmap, args->flist,
3e57ecf6 OW	501	NULL))) {
1da177e4 LT	502	kmem_free(mapp, sizeof(mapp) count);
	503	return error;
	504	}
	505	if (nmap < 1)
	506	break;
	507	/*
	508	* Add this bunch into our table, go to the next offset.
	509	*/
	510	mapi += nmap;
	511	b = mapp[mapi - 1].br_startoff +
	512	mapp[mapi - 1].br_blockcount;
	513	}
	514	}
	515	/*
	516	* Didn't work.
	517	*/
	518	else {
	519	mapi = 0;
	520	mapp = NULL;
	521	}
	522	/*
	523	* See how many fsb's we got.
	524	*/
	525	for (i = 0, got = 0; i < mapi; i++)
	526	got += mapp[i].br_blockcount;
	527	/*
	528	* Didn't get enough fsb's, or the first/last block's are wrong.
	529	*/
	530	if (got != count \|\| mapp[0].br_startoff != bno \|\|
	531	mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount !=
	532	bno + count) {
	533	if (mapp != &map)
	534	kmem_free(mapp, sizeof(mapp) count);
	535	return XFS_ERROR(ENOSPC);
	536	}
	537	/*
	538	* Done with the temporary mapping table.
	539	*/
	540	if (mapp != &map)
	541	kmem_free(mapp, sizeof(mapp) count);
bbaaf538	542	*dbp = xfs_dir2_da_to_db(mp, (xfs_dablk_t)bno);
1da177e4 LT	543	/*
	544	* Update file's size if this is the data space and it grew.
	545	*/
	546	if (space == XFS_DIR2_DATA_SPACE) {
	547	xfs_fsize_t size; /* directory file (data) size */
	548
	549	size = XFS_FSB_TO_B(mp, bno + count);
	550	if (size > dp->i_d.di_size) {
	551	dp->i_d.di_size = size;
	552	xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
	553	}
	554	}
	555	return 0;
	556	}
	557
	558	/*
	559	* See if the directory is a single-block form directory.
	560	*/
f6c2d1fa	561	int
1da177e4	562	xfs_dir2_isblock(
f6c2d1fa NS	563	xfs_trans_t *tp,
f6c2d1fa NS	564	xfs_inode_t *dp,
1da177e4 LT	565	int vp) / out: 1 is block, 0 is not block */
	566	{
	567	xfs_fileoff_t last; /* last file offset */
f6c2d1fa NS	568	xfs_mount_t *mp;
f6c2d1fa NS	569	int rval;
1da177e4 LT	570
1da177e4 LT	571	mp = dp->i_mount;
f6c2d1fa	572	if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
1da177e4	573	return rval;
1da177e4 LT	574	rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
	575	ASSERT(rval == 0 \|\| dp->i_d.di_size == mp->m_dirblksize);
	576	*vp = rval;
	577	return 0;
	578	}
	579
	580	/*
	581	* See if the directory is a single-leaf form directory.
	582	*/
f6c2d1fa	583	int
1da177e4	584	xfs_dir2_isleaf(
f6c2d1fa NS	585	xfs_trans_t *tp,
f6c2d1fa NS	586	xfs_inode_t *dp,
1da177e4 LT	587	int vp) / out: 1 is leaf, 0 is not leaf */
	588	{
	589	xfs_fileoff_t last; /* last file offset */
f6c2d1fa NS	590	xfs_mount_t *mp;
f6c2d1fa NS	591	int rval;
1da177e4 LT	592
1da177e4 LT	593	mp = dp->i_mount;
f6c2d1fa	594	if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
1da177e4	595	return rval;
1da177e4 LT	596	*vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
	597	return 0;
	598	}
	599
1da177e4 LT	600	/*
	601	* Remove the given block from the directory.
	602	* This routine is used for data and free blocks, leaf/node are done
	603	* by xfs_da_shrink_inode.
	604	*/
	605	int
	606	xfs_dir2_shrink_inode(
f6c2d1fa NS	607	xfs_da_args_t *args,
	608	xfs_dir2_db_t db,
	609	xfs_dabuf_t *bp)
1da177e4 LT	610	{
	611	xfs_fileoff_t bno; /* directory file offset */
	612	xfs_dablk_t da; /* directory file offset */
	613	int done; /* bunmap is finished */
f6c2d1fa NS	614	xfs_inode_t *dp;
	615	int error;
	616	xfs_mount_t *mp;
	617	xfs_trans_t *tp;
1da177e4 LT	618
	619	xfs_dir2_trace_args_db("shrink_inode", args, db, bp);
	620	dp = args->dp;
	621	mp = dp->i_mount;
	622	tp = args->trans;
bbaaf538	623	da = xfs_dir2_db_to_da(mp, db);
1da177e4 LT	624	/*
	625	* Unmap the fsblock(s).
	626	*/
	627	if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
	628	XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
3e57ecf6	629	NULL, &done))) {
1da177e4 LT	630	/*
	631	* ENOSPC actually can happen if we're in a removename with
	632	* no space reservation, and the resulting block removal
	633	* would cause a bmap btree split or conversion from extents
	634	* to btree. This can only happen for un-fragmented
	635	* directory blocks, since you need to be punching out
	636	* the middle of an extent.
	637	* In this case we need to leave the block in the file,
	638	* and not binval it.
	639	* So the block has to be in a consistent empty state
	640	* and appropriately logged.
	641	* We don't free up the buffer, the caller can tell it
	642	* hasn't happened since it got an error back.
	643	*/
	644	return error;
	645	}
	646	ASSERT(done);
	647	/*
	648	* Invalidate the buffer from the transaction.
	649	*/
	650	xfs_da_binval(tp, bp);
	651	/*
	652	* If it's not a data block, we're done.
	653	*/
	654	if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
	655	return 0;
	656	/*
	657	* If the block isn't the last one in the directory, we're done.
	658	*/
bbaaf538	659	if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(mp, db + 1, 0))
1da177e4 LT	660	return 0;
	661	bno = da;
	662	if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
	663	/*
	664	* This can't really happen unless there's kernel corruption.
	665	*/
	666	return error;
	667	}
	668	if (db == mp->m_dirdatablk)
	669	ASSERT(bno == 0);
	670	else
	671	ASSERT(bno > 0);
	672	/*
	673	* Set the size to the new last block.
	674	*/
	675	dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
	676	xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
	677	return 0;
	678	}