[linux.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_mount.h"
#include "xfs_da_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_inode_item.h"
#include "xfs_bmap.h"
#include "xfs_dir2.h"
#include "xfs_dir2_format.h"
#include "xfs_dir2_priv.h"
#include "xfs_error.h"
#include "xfs_vnodeops.h"
#include "xfs_trace.h"

struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2};

/*
 * ASCII case-insensitive (ie. A-Z) support for directories that was
 * used in IRIX.
 */
STATIC xfs_dahash_t
xfs_ascii_ci_hashname(
	struct xfs_name	*name)
{
	xfs_dahash_t	hash;
	int		i;

	for (i = 0, hash = 0; i < name->len; i++)
		hash = tolower(name->name[i]) ^ rol32(hash, 7);

	return hash;
}

STATIC enum xfs_dacmp
xfs_ascii_ci_compname(
	struct xfs_da_args *args,
	const unsigned char *name,
	int		len)
{
	enum xfs_dacmp	result;
	int		i;

	if (args->namelen != len)
		return XFS_CMP_DIFFERENT;

	result = XFS_CMP_EXACT;
	for (i = 0; i < len; i++) {
		if (args->name[i] == name[i])
			continue;
		if (tolower(args->name[i]) != tolower(name[i]))
			return XFS_CMP_DIFFERENT;
		result = XFS_CMP_CASE;
	}

	return result;
}

static struct xfs_nameops xfs_ascii_ci_nameops = {
	.hashname	= xfs_ascii_ci_hashname,
	.compname	= xfs_ascii_ci_compname,
};

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;
	if (xfs_sb_version_hasasciici(&mp->m_sb))
		mp->m_dirnameops = &xfs_ascii_ci_nameops;
	else
		mp->m_dirnameops = &xfs_default_nameops;
}

/*
 * Return 1 if directory contains only "." and "..".
 */
int
xfs_dir_isempty(
	xfs_inode_t	*dp)
{
	xfs_dir2_sf_hdr_t	*sfp;

	ASSERT(S_ISDIR(dp->i_d.di_mode));
	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_hdr_t *)dp->i_df.if_u1.if_data;
	return !sfp->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_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(S_ISDIR(dp->i_d.di_mode));
	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,
	struct xfs_name		*name,
	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(S_ISDIR(dp->i_d.di_mode));
	if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
		return rval;
	XFS_STATS_INC(xs_dir_create);

	memset(&args, 0, sizeof(xfs_da_args_t));
	args.name = name->name;
	args.namelen = name->len;
	args.hashval = dp->i_mount->m_dirnameops->hashname(name);
	args.inumber = inum;
	args.dp = dp;
	args.firstblock = first;
	args.flist = flist;
	args.total = total;
	args.whichfork = XFS_DATA_FORK;
	args.trans = tp;
	args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;

	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;
}

/*
 * If doing a CI lookup and case-insensitive match, dup actual name into
 * args.value. Return EEXIST for success (ie. name found) or an error.
 */
int
xfs_dir_cilookup_result(
	struct xfs_da_args *args,
	const unsigned char *name,
	int		len)
{
	if (args->cmpresult == XFS_CMP_DIFFERENT)
		return ENOENT;
	if (args->cmpresult != XFS_CMP_CASE ||
					!(args->op_flags & XFS_DA_OP_CILOOKUP))
		return EEXIST;

	args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
	if (!args->value)
		return ENOMEM;

	memcpy(args->value, name, len);
	args->valuelen = len;
	return EEXIST;
}

/*
 * Lookup a name in a directory, give back the inode number.
 * If ci_name is not NULL, returns the actual name in ci_name if it differs
 * to name, or ci_name->name is set to NULL for an exact match.
 */

int
xfs_dir_lookup(
	xfs_trans_t	*tp,
	xfs_inode_t	*dp,
	struct xfs_name	*name,
	xfs_ino_t	*inum,		/* out: inode number */
	struct xfs_name *ci_name)	/* out: actual name if CI match */
{
	xfs_da_args_t	args;
	int		rval;
	int		v;		/* type-checking value */

	ASSERT(S_ISDIR(dp->i_d.di_mode));
	XFS_STATS_INC(xs_dir_lookup);

	memset(&args, 0, sizeof(xfs_da_args_t));
	args.name = name->name;
	args.namelen = name->len;
	args.hashval = dp->i_mount->m_dirnameops->hashname(name);
	args.dp = dp;
	args.whichfork = XFS_DATA_FORK;
	args.trans = tp;
	args.op_flags = XFS_DA_OP_OKNOENT;
	if (ci_name)
		args.op_flags |= XFS_DA_OP_CILOOKUP;

	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) {
		*inum = args.inumber;
		if (ci_name) {
			ci_name->name = args.value;
			ci_name->len = args.valuelen;
		}
	}
	return rval;
}

/*
 * Remove an entry from a directory.
 */
int
xfs_dir_removename(
	xfs_trans_t	*tp,
	xfs_inode_t	*dp,
	struct xfs_name	*name,
	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(S_ISDIR(dp->i_d.di_mode));
	XFS_STATS_INC(xs_dir_remove);

	memset(&args, 0, sizeof(xfs_da_args_t));
	args.name = name->name;
	args.namelen = name->len;
	args.hashval = dp->i_mount->m_dirnameops->hashname(name);
	args.inumber = ino;
	args.dp = dp;
	args.firstblock = first;
	args.flist = flist;
	args.total = total;
	args.whichfork = XFS_DATA_FORK;
	args.trans = tp;

	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 */

	trace_xfs_readdir(dp);

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

	ASSERT(S_ISDIR(dp->i_d.di_mode));
	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,
	struct xfs_name	*name,		/* name 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;
	int		rval;
	int		v;		/* type-checking value */

	ASSERT(S_ISDIR(dp->i_d.di_mode));

	if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
		return rval;

	memset(&args, 0, sizeof(xfs_da_args_t));
	args.name = name->name;
	args.namelen = name->len;
	args.hashval = dp->i_mount->m_dirnameops->hashname(name);
	args.inumber = inum;
	args.dp = dp;
	args.firstblock = first;
	args.flist = flist;
	args.total = total;
	args.whichfork = XFS_DATA_FORK;
	args.trans = tp;

	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.
 * First checks that the caller couldn't reserve enough space (resblks = 0).
 */
int
xfs_dir_canenter(
	xfs_trans_t	*tp,
	xfs_inode_t	*dp,
	struct xfs_name	*name,		/* name of entry to add */
	uint		resblks)
{
	xfs_da_args_t	args;
	int		rval;
	int		v;		/* type-checking value */

	if (resblks)
		return 0;

	ASSERT(S_ISDIR(dp->i_d.di_mode));

	memset(&args, 0, sizeof(xfs_da_args_t));
	args.name = name->name;
	args.namelen = name->len;
	args.hashval = dp->i_mount->m_dirnameops->hashname(name);
	args.dp = dp;
	args.whichfork = XFS_DATA_FORK;
	args.trans = tp;
	args.op_flags = XFS_DA_OP_JUSTCHECK | XFS_DA_OP_ADDNAME |
							XFS_DA_OP_OKNOENT;

	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(
	struct xfs_da_args	*args,
	int			space,	/* v2 dir's space XFS_DIR2_xxx_SPACE */
	xfs_dir2_db_t		*dbp)	/* out: block number added */
{
	struct xfs_inode	*dp = args->dp;
	struct xfs_mount	*mp = dp->i_mount;
	xfs_fileoff_t		bno;	/* directory offset of new block */
	int			count;	/* count of filesystem blocks */
	int			error;

	trace_xfs_dir2_grow_inode(args, space);

	/*
	 * Set lowest possible block in the space requested.
	 */
	bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
	count = mp->m_dirblkfsbs;

	error = xfs_da_grow_inode_int(args, &bno, count);
	if (error)
		return error;

	*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(args->trans, 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;

	trace_xfs_dir2_shrink_inode(args, db);

	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;
}
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	27	#include "xfs_mount.h"
a844f451	28	#include "xfs_da_btree.h"
1da177e4	29	#include "xfs_bmap_btree.h"
a844f451	30	#include "xfs_alloc_btree.h"
1da177e4	31	#include "xfs_dinode.h"
1da177e4	32	#include "xfs_inode.h"
a844f451	33	#include "xfs_inode_item.h"
1da177e4	34	#include "xfs_bmap.h"
57926640 CH	35	#include "xfs_dir2.h"
	36	#include "xfs_dir2_format.h"
	37	#include "xfs_dir2_priv.h"
1da177e4	38	#include "xfs_error.h"
a8272ce0	39	#include "xfs_vnodeops.h"
0b1b213f	40	#include "xfs_trace.h"
1da177e4	41
4a24cb71	42	struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2};
1da177e4	43
189f4bf2 BN	44	/*
	45	* ASCII case-insensitive (ie. A-Z) support for directories that was
	46	* used in IRIX.
	47	*/
	48	STATIC xfs_dahash_t
	49	xfs_ascii_ci_hashname(
	50	struct xfs_name *name)
	51	{
	52	xfs_dahash_t hash;
	53	int i;
	54
	55	for (i = 0, hash = 0; i < name->len; i++)
	56	hash = tolower(name->name[i]) ^ rol32(hash, 7);
	57
	58	return hash;
	59	}
	60
	61	STATIC enum xfs_dacmp
	62	xfs_ascii_ci_compname(
	63	struct xfs_da_args *args,
2bc75421 DC	64	const unsigned char *name,
2bc75421 DC	65	int len)
189f4bf2 BN	66	{
	67	enum xfs_dacmp result;
	68	int i;
	69
	70	if (args->namelen != len)
	71	return XFS_CMP_DIFFERENT;
	72
	73	result = XFS_CMP_EXACT;
	74	for (i = 0; i < len; i++) {
	75	if (args->name[i] == name[i])
	76	continue;
	77	if (tolower(args->name[i]) != tolower(name[i]))
	78	return XFS_CMP_DIFFERENT;
	79	result = XFS_CMP_CASE;
	80	}
	81
	82	return result;
	83	}
	84
	85	static struct xfs_nameops xfs_ascii_ci_nameops = {
	86	.hashname = xfs_ascii_ci_hashname,
	87	.compname = xfs_ascii_ci_compname,
	88	};
	89
f6c2d1fa NS	90	void
	91	xfs_dir_mount(
	92	xfs_mount_t *mp)
1da177e4	93	{
62118709	94	ASSERT(xfs_sb_version_hasdirv2(&mp->m_sb));
1da177e4 LT	95	ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
	96	XFS_MAX_BLOCKSIZE);
	97	mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
	98	mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
bbaaf538 CH	99	mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
	100	mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
	101	mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));
1da177e4 LT	102	mp->m_attr_node_ents =
	103	(mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) /
	104	(uint)sizeof(xfs_da_node_entry_t);
	105	mp->m_dir_node_ents =
	106	(mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) /
	107	(uint)sizeof(xfs_da_node_entry_t);
	108	mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
189f4bf2 BN	109	if (xfs_sb_version_hasasciici(&mp->m_sb))
	110	mp->m_dirnameops = &xfs_ascii_ci_nameops;
	111	else
	112	mp->m_dirnameops = &xfs_default_nameops;
1da177e4 LT	113	}
	114
	115	/*
	116	* Return 1 if directory contains only "." and "..".
	117	*/
f6c2d1fa NS	118	int
	119	xfs_dir_isempty(
	120	xfs_inode_t *dp)
1da177e4	121	{
ac8ba50f	122	xfs_dir2_sf_hdr_t *sfp;
1da177e4	123
abbede1b	124	ASSERT(S_ISDIR(dp->i_d.di_mode));
f6c2d1fa	125	if (dp->i_d.di_size == 0) /* might happen during shutdown. */
1da177e4	126	return 1;
1da177e4 LT	127	if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
1da177e4 LT	128	return 0;
ac8ba50f CH	129	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
ac8ba50f CH	130	return !sfp->count;
1da177e4 LT	131	}
1da177e4 LT	132
f6c2d1fa NS	133	/*
	134	* Validate a given inode number.
	135	*/
	136	int
	137	xfs_dir_ino_validate(
	138	xfs_mount_t *mp,
	139	xfs_ino_t ino)
	140	{
	141	xfs_agblock_t agblkno;
	142	xfs_agino_t agino;
	143	xfs_agnumber_t agno;
	144	int ino_ok;
	145	int ioff;
	146
	147	agno = XFS_INO_TO_AGNO(mp, ino);
	148	agblkno = XFS_INO_TO_AGBNO(mp, ino);
	149	ioff = XFS_INO_TO_OFFSET(mp, ino);
	150	agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
	151	ino_ok =
	152	agno < mp->m_sb.sb_agcount &&
	153	agblkno < mp->m_sb.sb_agblocks &&
	154	agblkno != 0 &&
	155	ioff < (1 << mp->m_sb.sb_inopblog) &&
	156	XFS_AGINO_TO_INO(mp, agno, agino) == ino;
	157	if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
	158	XFS_RANDOM_DIR_INO_VALIDATE))) {
53487786	159	xfs_warn(mp, "Invalid inode number 0x%Lx",
f6c2d1fa NS	160	(unsigned long long) ino);
	161	XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
	162	return XFS_ERROR(EFSCORRUPTED);
	163	}
	164	return 0;
	165	}
	166
1da177e4 LT	167	/*
	168	* Initialize a directory with its "." and ".." entries.
	169	*/
f6c2d1fa NS	170	int
	171	xfs_dir_init(
	172	xfs_trans_t *tp,
	173	xfs_inode_t *dp,
	174	xfs_inode_t *pdp)
1da177e4	175	{
f6c2d1fa NS	176	xfs_da_args_t args;
f6c2d1fa NS	177	int error;
1da177e4 LT	178
	179	memset((char *)&args, 0, sizeof(args));
	180	args.dp = dp;
	181	args.trans = tp;
abbede1b	182	ASSERT(S_ISDIR(dp->i_d.di_mode));
f6c2d1fa	183	if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
1da177e4	184	return error;
1da177e4 LT	185	return xfs_dir2_sf_create(&args, pdp->i_ino);
	186	}
	187
	188	/*
	189	Enter a name in a directory.
	190	*/
f6c2d1fa NS	191	int
	192	xfs_dir_createname(
	193	xfs_trans_t *tp,
	194	xfs_inode_t *dp,
556b8b16	195	struct xfs_name *name,
1da177e4 LT	196	xfs_ino_t inum, /* new entry inode number */
	197	xfs_fsblock_t first, / bmap's firstblock */
	198	xfs_bmap_free_t flist, / bmap's freeblock list */
	199	xfs_extlen_t total) /* bmap's total block count */
	200	{
f6c2d1fa NS	201	xfs_da_args_t args;
f6c2d1fa NS	202	int rval;
1da177e4 LT	203	int v; /* type-checking value */
1da177e4 LT	204
abbede1b	205	ASSERT(S_ISDIR(dp->i_d.di_mode));
f6c2d1fa	206	if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
1da177e4	207	return rval;
1da177e4	208	XFS_STATS_INC(xs_dir_create);
f6c2d1fa	209
87affd08	210	memset(&args, 0, sizeof(xfs_da_args_t));
556b8b16 BN	211	args.name = name->name;
556b8b16 BN	212	args.namelen = name->len;
5163f95a	213	args.hashval = dp->i_mount->m_dirnameops->hashname(name);
1da177e4 LT	214	args.inumber = inum;
	215	args.dp = dp;
	216	args.firstblock = first;
	217	args.flist = flist;
	218	args.total = total;
	219	args.whichfork = XFS_DATA_FORK;
	220	args.trans = tp;
6a178100	221	args.op_flags = XFS_DA_OP_ADDNAME \| XFS_DA_OP_OKNOENT;
f6c2d1fa	222
1da177e4 LT	223	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
1da177e4 LT	224	rval = xfs_dir2_sf_addname(&args);
f6c2d1fa	225	else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
1da177e4	226	return rval;
f6c2d1fa	227	else if (v)
1da177e4	228	rval = xfs_dir2_block_addname(&args);
f6c2d1fa	229	else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
1da177e4	230	return rval;
f6c2d1fa	231	else if (v)
1da177e4 LT	232	rval = xfs_dir2_leaf_addname(&args);
	233	else
	234	rval = xfs_dir2_node_addname(&args);
	235	return rval;
	236	}
	237
384f3ced BN	238	/*
	239	* If doing a CI lookup and case-insensitive match, dup actual name into
	240	* args.value. Return EEXIST for success (ie. name found) or an error.
	241	*/
	242	int
	243	xfs_dir_cilookup_result(
	244	struct xfs_da_args *args,
a3380ae3	245	const unsigned char *name,
384f3ced BN	246	int len)
	247	{
	248	if (args->cmpresult == XFS_CMP_DIFFERENT)
	249	return ENOENT;
	250	if (args->cmpresult != XFS_CMP_CASE \|\|
	251	!(args->op_flags & XFS_DA_OP_CILOOKUP))
	252	return EEXIST;
	253
3f52c2f0	254	args->value = kmem_alloc(len, KM_NOFS \| KM_MAYFAIL);
384f3ced BN	255	if (!args->value)
	256	return ENOMEM;
	257
	258	memcpy(args->value, name, len);
	259	args->valuelen = len;
	260	return EEXIST;
	261	}
	262
1da177e4 LT	263	/*
1da177e4 LT	264	* Lookup a name in a directory, give back the inode number.
384f3ced BN	265	* If ci_name is not NULL, returns the actual name in ci_name if it differs
384f3ced BN	266	* to name, or ci_name->name is set to NULL for an exact match.
1da177e4	267	*/
384f3ced	268
f6c2d1fa NS	269	int
	270	xfs_dir_lookup(
	271	xfs_trans_t *tp,
	272	xfs_inode_t *dp,
556b8b16	273	struct xfs_name *name,
384f3ced BN	274	xfs_ino_t inum, / out: inode number */
384f3ced BN	275	struct xfs_name ci_name) / out: actual name if CI match */
1da177e4	276	{
f6c2d1fa NS	277	xfs_da_args_t args;
f6c2d1fa NS	278	int rval;
1da177e4 LT	279	int v; /* type-checking value */
1da177e4 LT	280
abbede1b	281	ASSERT(S_ISDIR(dp->i_d.di_mode));
1da177e4 LT	282	XFS_STATS_INC(xs_dir_lookup);
1da177e4 LT	283
87affd08	284	memset(&args, 0, sizeof(xfs_da_args_t));
556b8b16 BN	285	args.name = name->name;
556b8b16 BN	286	args.namelen = name->len;
5163f95a	287	args.hashval = dp->i_mount->m_dirnameops->hashname(name);
1da177e4	288	args.dp = dp;
1da177e4 LT	289	args.whichfork = XFS_DATA_FORK;
1da177e4 LT	290	args.trans = tp;
6a178100	291	args.op_flags = XFS_DA_OP_OKNOENT;
384f3ced BN	292	if (ci_name)
384f3ced BN	293	args.op_flags \|= XFS_DA_OP_CILOOKUP;
f6c2d1fa	294
1da177e4 LT	295	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
1da177e4 LT	296	rval = xfs_dir2_sf_lookup(&args);
f6c2d1fa	297	else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
1da177e4	298	return rval;
f6c2d1fa	299	else if (v)
1da177e4	300	rval = xfs_dir2_block_lookup(&args);
f6c2d1fa	301	else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
1da177e4	302	return rval;
f6c2d1fa	303	else if (v)
1da177e4 LT	304	rval = xfs_dir2_leaf_lookup(&args);
	305	else
	306	rval = xfs_dir2_node_lookup(&args);
	307	if (rval == EEXIST)
	308	rval = 0;
384f3ced	309	if (!rval) {
1da177e4	310	*inum = args.inumber;
384f3ced BN	311	if (ci_name) {
	312	ci_name->name = args.value;
	313	ci_name->len = args.valuelen;
	314	}
	315	}
1da177e4 LT	316	return rval;
	317	}
	318
	319	/*
	320	* Remove an entry from a directory.
	321	*/
f6c2d1fa NS	322	int
	323	xfs_dir_removename(
	324	xfs_trans_t *tp,
	325	xfs_inode_t *dp,
556b8b16	326	struct xfs_name *name,
f6c2d1fa	327	xfs_ino_t ino,
1da177e4 LT	328	xfs_fsblock_t first, / bmap's firstblock */
	329	xfs_bmap_free_t flist, / bmap's freeblock list */
	330	xfs_extlen_t total) /* bmap's total block count */
	331	{
f6c2d1fa NS	332	xfs_da_args_t args;
f6c2d1fa NS	333	int rval;
1da177e4 LT	334	int v; /* type-checking value */
1da177e4 LT	335
abbede1b	336	ASSERT(S_ISDIR(dp->i_d.di_mode));
1da177e4	337	XFS_STATS_INC(xs_dir_remove);
f6c2d1fa	338
87affd08	339	memset(&args, 0, sizeof(xfs_da_args_t));
556b8b16 BN	340	args.name = name->name;
556b8b16 BN	341	args.namelen = name->len;
5163f95a	342	args.hashval = dp->i_mount->m_dirnameops->hashname(name);
1da177e4 LT	343	args.inumber = ino;
	344	args.dp = dp;
	345	args.firstblock = first;
	346	args.flist = flist;
	347	args.total = total;
	348	args.whichfork = XFS_DATA_FORK;
	349	args.trans = tp;
f6c2d1fa	350
1da177e4 LT	351	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
1da177e4 LT	352	rval = xfs_dir2_sf_removename(&args);
f6c2d1fa	353	else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
1da177e4	354	return rval;
f6c2d1fa	355	else if (v)
1da177e4	356	rval = xfs_dir2_block_removename(&args);
f6c2d1fa	357	else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
1da177e4	358	return rval;
f6c2d1fa	359	else if (v)
1da177e4 LT	360	rval = xfs_dir2_leaf_removename(&args);
	361	else
	362	rval = xfs_dir2_node_removename(&args);
	363	return rval;
	364	}
	365
	366	/*
	367	* Read a directory.
	368	*/
f6c2d1fa	369	int
051e7cd4	370	xfs_readdir(
993386c1	371	xfs_inode_t *dp,
051e7cd4 CH	372	void *dirent,
	373	size_t bufsize,
	374	xfs_off_t *offset,
	375	filldir_t filldir)
1da177e4	376	{
1da177e4 LT	377	int rval; /* return value */
	378	int v; /* type-checking value */
	379
cca28fb8	380	trace_xfs_readdir(dp);
051e7cd4 CH	381
	382	if (XFS_FORCED_SHUTDOWN(dp->i_mount))
	383	return XFS_ERROR(EIO);
	384
abbede1b	385	ASSERT(S_ISDIR(dp->i_d.di_mode));
1da177e4	386	XFS_STATS_INC(xs_dir_getdents);
1da177e4	387
1da177e4	388	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
051e7cd4 CH	389	rval = xfs_dir2_sf_getdents(dp, dirent, offset, filldir);
051e7cd4 CH	390	else if ((rval = xfs_dir2_isblock(NULL, dp, &v)))
1da177e4	391	;
f6c2d1fa	392	else if (v)
051e7cd4	393	rval = xfs_dir2_block_getdents(dp, dirent, offset, filldir);
1da177e4	394	else
051e7cd4 CH	395	rval = xfs_dir2_leaf_getdents(dp, dirent, bufsize, offset,
051e7cd4 CH	396	filldir);
1da177e4 LT	397	return rval;
	398	}
	399
	400	/*
	401	* Replace the inode number of a directory entry.
	402	*/
f6c2d1fa NS	403	int
	404	xfs_dir_replace(
	405	xfs_trans_t *tp,
	406	xfs_inode_t *dp,
556b8b16	407	struct xfs_name name, / name of entry to replace */
1da177e4 LT	408	xfs_ino_t inum, /* new inode number */
	409	xfs_fsblock_t first, / bmap's firstblock */
	410	xfs_bmap_free_t flist, / bmap's freeblock list */
	411	xfs_extlen_t total) /* bmap's total block count */
	412	{
f6c2d1fa NS	413	xfs_da_args_t args;
f6c2d1fa NS	414	int rval;
1da177e4 LT	415	int v; /* type-checking value */
1da177e4 LT	416
abbede1b	417	ASSERT(S_ISDIR(dp->i_d.di_mode));
1da177e4	418
f6c2d1fa	419	if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
1da177e4	420	return rval;
f6c2d1fa	421
87affd08	422	memset(&args, 0, sizeof(xfs_da_args_t));
556b8b16 BN	423	args.name = name->name;
556b8b16 BN	424	args.namelen = name->len;
5163f95a	425	args.hashval = dp->i_mount->m_dirnameops->hashname(name);
1da177e4 LT	426	args.inumber = inum;
	427	args.dp = dp;
	428	args.firstblock = first;
	429	args.flist = flist;
	430	args.total = total;
	431	args.whichfork = XFS_DATA_FORK;
	432	args.trans = tp;
f6c2d1fa	433
1da177e4 LT	434	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
1da177e4 LT	435	rval = xfs_dir2_sf_replace(&args);
f6c2d1fa	436	else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
1da177e4	437	return rval;
f6c2d1fa	438	else if (v)
1da177e4	439	rval = xfs_dir2_block_replace(&args);
f6c2d1fa	440	else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
1da177e4	441	return rval;
f6c2d1fa	442	else if (v)
1da177e4 LT	443	rval = xfs_dir2_leaf_replace(&args);
	444	else
	445	rval = xfs_dir2_node_replace(&args);
	446	return rval;
	447	}
	448
	449	/*
	450	* See if this entry can be added to the directory without allocating space.
556b8b16	451	* First checks that the caller couldn't reserve enough space (resblks = 0).
1da177e4	452	*/
f6c2d1fa NS	453	int
	454	xfs_dir_canenter(
	455	xfs_trans_t *tp,
	456	xfs_inode_t *dp,
556b8b16 BN	457	struct xfs_name name, / name of entry to add */
556b8b16 BN	458	uint resblks)
1da177e4	459	{
f6c2d1fa NS	460	xfs_da_args_t args;
f6c2d1fa NS	461	int rval;
1da177e4 LT	462	int v; /* type-checking value */
1da177e4 LT	463
556b8b16 BN	464	if (resblks)
	465	return 0;
	466
abbede1b	467	ASSERT(S_ISDIR(dp->i_d.di_mode));
f6c2d1fa	468
87affd08	469	memset(&args, 0, sizeof(xfs_da_args_t));
556b8b16 BN	470	args.name = name->name;
556b8b16 BN	471	args.namelen = name->len;
5163f95a	472	args.hashval = dp->i_mount->m_dirnameops->hashname(name);
1da177e4	473	args.dp = dp;
1da177e4 LT	474	args.whichfork = XFS_DATA_FORK;
1da177e4 LT	475	args.trans = tp;
6a178100 BN	476	args.op_flags = XFS_DA_OP_JUSTCHECK \| XFS_DA_OP_ADDNAME \|
6a178100 BN	477	XFS_DA_OP_OKNOENT;
f6c2d1fa	478
1da177e4 LT	479	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
1da177e4 LT	480	rval = xfs_dir2_sf_addname(&args);
f6c2d1fa	481	else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
1da177e4	482	return rval;
f6c2d1fa	483	else if (v)
1da177e4	484	rval = xfs_dir2_block_addname(&args);
f6c2d1fa	485	else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
1da177e4	486	return rval;
f6c2d1fa	487	else if (v)
1da177e4 LT	488	rval = xfs_dir2_leaf_addname(&args);
	489	else
	490	rval = xfs_dir2_node_addname(&args);
	491	return rval;
	492	}
	493
1da177e4 LT	494	/*
	495	* Utility routines.
	496	*/
	497
	498	/*
	499	* Add a block to the directory.
77936d02 CH	500	*
	501	* This routine is for data and free blocks, not leaf/node blocks which are
	502	* handled by xfs_da_grow_inode.
1da177e4	503	*/
f6c2d1fa	504	int
1da177e4	505	xfs_dir2_grow_inode(
77936d02 CH	506	struct xfs_da_args *args,
	507	int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
	508	xfs_dir2_db_t dbp) / out: block number added */
1da177e4	509	{
77936d02 CH	510	struct xfs_inode *dp = args->dp;
	511	struct xfs_mount *mp = dp->i_mount;
	512	xfs_fileoff_t bno; /* directory offset of new block */
	513	int count; /* count of filesystem blocks */
	514	int error;
1da177e4	515
0b1b213f CH	516	trace_xfs_dir2_grow_inode(args, space);
0b1b213f CH	517
1da177e4 LT	518	/*
	519	* Set lowest possible block in the space requested.
	520	*/
	521	bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
	522	count = mp->m_dirblkfsbs;
77936d02 CH	523
	524	error = xfs_da_grow_inode_int(args, &bno, count);
	525	if (error)
1da177e4	526	return error;
a7444053	527
bbaaf538	528	*dbp = xfs_dir2_da_to_db(mp, (xfs_dablk_t)bno);
a7444053	529
1da177e4 LT	530	/*
	531	* Update file's size if this is the data space and it grew.
	532	*/
	533	if (space == XFS_DIR2_DATA_SPACE) {
	534	xfs_fsize_t size; /* directory file (data) size */
	535
	536	size = XFS_FSB_TO_B(mp, bno + count);
	537	if (size > dp->i_d.di_size) {
	538	dp->i_d.di_size = size;
77936d02	539	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
1da177e4 LT	540	}
	541	}
	542	return 0;
	543	}
	544
	545	/*
	546	* See if the directory is a single-block form directory.
	547	*/
f6c2d1fa	548	int
1da177e4	549	xfs_dir2_isblock(
f6c2d1fa NS	550	xfs_trans_t *tp,
f6c2d1fa NS	551	xfs_inode_t *dp,
1da177e4 LT	552	int vp) / out: 1 is block, 0 is not block */
	553	{
	554	xfs_fileoff_t last; /* last file offset */
f6c2d1fa NS	555	xfs_mount_t *mp;
f6c2d1fa NS	556	int rval;
1da177e4 LT	557
1da177e4 LT	558	mp = dp->i_mount;
f6c2d1fa	559	if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
1da177e4	560	return rval;
1da177e4 LT	561	rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
	562	ASSERT(rval == 0 \|\| dp->i_d.di_size == mp->m_dirblksize);
	563	*vp = rval;
	564	return 0;
	565	}
	566
	567	/*
	568	* See if the directory is a single-leaf form directory.
	569	*/
f6c2d1fa	570	int
1da177e4	571	xfs_dir2_isleaf(
f6c2d1fa NS	572	xfs_trans_t *tp,
f6c2d1fa NS	573	xfs_inode_t *dp,
1da177e4 LT	574	int vp) / out: 1 is leaf, 0 is not leaf */
	575	{
	576	xfs_fileoff_t last; /* last file offset */
f6c2d1fa NS	577	xfs_mount_t *mp;
f6c2d1fa NS	578	int rval;
1da177e4 LT	579
1da177e4 LT	580	mp = dp->i_mount;
f6c2d1fa	581	if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
1da177e4	582	return rval;
1da177e4 LT	583	*vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
	584	return 0;
	585	}
	586
1da177e4 LT	587	/*
	588	* Remove the given block from the directory.
	589	* This routine is used for data and free blocks, leaf/node are done
	590	* by xfs_da_shrink_inode.
	591	*/
	592	int
	593	xfs_dir2_shrink_inode(
f6c2d1fa NS	594	xfs_da_args_t *args,
	595	xfs_dir2_db_t db,
	596	xfs_dabuf_t *bp)
1da177e4 LT	597	{
	598	xfs_fileoff_t bno; /* directory file offset */
	599	xfs_dablk_t da; /* directory file offset */
	600	int done; /* bunmap is finished */
f6c2d1fa NS	601	xfs_inode_t *dp;
	602	int error;
	603	xfs_mount_t *mp;
	604	xfs_trans_t *tp;
1da177e4	605
0b1b213f CH	606	trace_xfs_dir2_shrink_inode(args, db);
0b1b213f CH	607
1da177e4 LT	608	dp = args->dp;
	609	mp = dp->i_mount;
	610	tp = args->trans;
bbaaf538	611	da = xfs_dir2_db_to_da(mp, db);
1da177e4 LT	612	/*
	613	* Unmap the fsblock(s).
	614	*/
	615	if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
	616	XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
b4e9181e	617	&done))) {
1da177e4 LT	618	/*
	619	* ENOSPC actually can happen if we're in a removename with
	620	* no space reservation, and the resulting block removal
	621	* would cause a bmap btree split or conversion from extents
	622	* to btree. This can only happen for un-fragmented
	623	* directory blocks, since you need to be punching out
	624	* the middle of an extent.
	625	* In this case we need to leave the block in the file,
	626	* and not binval it.
	627	* So the block has to be in a consistent empty state
	628	* and appropriately logged.
	629	* We don't free up the buffer, the caller can tell it
	630	* hasn't happened since it got an error back.
	631	*/
	632	return error;
	633	}
	634	ASSERT(done);
	635	/*
	636	* Invalidate the buffer from the transaction.
	637	*/
	638	xfs_da_binval(tp, bp);
	639	/*
	640	* If it's not a data block, we're done.
	641	*/
	642	if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
	643	return 0;
	644	/*
	645	* If the block isn't the last one in the directory, we're done.
	646	*/
bbaaf538	647	if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(mp, db + 1, 0))
1da177e4 LT	648	return 0;
	649	bno = da;
	650	if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
	651	/*
	652	* This can't really happen unless there's kernel corruption.
	653	*/
	654	return error;
	655	}
	656	if (db == mp->m_dirdatablk)
	657	ASSERT(bno == 0);
	658	else
	659	ASSERT(bno > 0);
	660	/*
	661	* Set the size to the new last block.
	662	*/
	663	dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
	664	xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
	665	return 0;
	666	}