[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_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_inum.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_mount.h"
#include "xfs_da_format.h"
#include "xfs_da_btree.h"
#include "xfs_inode.h"
#include "xfs_trans.h"
#include "xfs_inode_item.h"
#include "xfs_bmap.h"
#include "xfs_dir2.h"
#include "xfs_dir2_priv.h"
#include "xfs_error.h"
#include "xfs_trace.h"
#include "xfs_dinode.h"

struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR };


/*
 * 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)
{
	int	nodehdr_size;


	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_dir_inode_ops = xfs_dir_get_ops(mp, NULL);
	mp->m_nondir_inode_ops = xfs_nondir_get_ops(mp, NULL);

	mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
	mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
	mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
	mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
	mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));

	nodehdr_size = mp->m_dir_inode_ops->node_hdr_size;
	mp->m_attr_node_ents = (mp->m_sb.sb_blocksize - nodehdr_size) /
				(uint)sizeof(xfs_da_node_entry_t);
	mp->m_dir_node_ents = (mp->m_dirblksize - nodehdr_size) /
				(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.filetype = name->type;
	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.filetype = name->type;
	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.filetype = name->type;
	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;
}

/*
 * 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.filetype = name->type;
	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.filetype = name->type;
	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,
	struct xfs_buf	*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_trans_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"
a4fbe6ab	20	#include "xfs_format.h"
239880ef DC	21	#include "xfs_log_format.h"
239880ef DC	22	#include "xfs_trans_resv.h"
a844f451	23	#include "xfs_inum.h"
1da177e4 LT	24	#include "xfs_sb.h"
1da177e4 LT	25	#include "xfs_ag.h"
1da177e4	26	#include "xfs_mount.h"
57062787	27	#include "xfs_da_format.h"
a844f451	28	#include "xfs_da_btree.h"
1da177e4	29	#include "xfs_inode.h"
239880ef	30	#include "xfs_trans.h"
a844f451	31	#include "xfs_inode_item.h"
1da177e4	32	#include "xfs_bmap.h"
2b9ab5ab	33	#include "xfs_dir2.h"
57926640	34	#include "xfs_dir2_priv.h"
1da177e4	35	#include "xfs_error.h"
0b1b213f	36	#include "xfs_trace.h"
a4fbe6ab	37	#include "xfs_dinode.h"
1da177e4	38
0cb97766 DC	39	struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR };
0cb97766 DC	40
1da177e4	41
189f4bf2 BN	42	/*
	43	* ASCII case-insensitive (ie. A-Z) support for directories that was
	44	* used in IRIX.
	45	*/
	46	STATIC xfs_dahash_t
	47	xfs_ascii_ci_hashname(
	48	struct xfs_name *name)
	49	{
	50	xfs_dahash_t hash;
	51	int i;
	52
	53	for (i = 0, hash = 0; i < name->len; i++)
	54	hash = tolower(name->name[i]) ^ rol32(hash, 7);
	55
	56	return hash;
	57	}
	58
	59	STATIC enum xfs_dacmp
	60	xfs_ascii_ci_compname(
	61	struct xfs_da_args *args,
2bc75421 DC	62	const unsigned char *name,
2bc75421 DC	63	int len)
189f4bf2 BN	64	{
	65	enum xfs_dacmp result;
	66	int i;
	67
	68	if (args->namelen != len)
	69	return XFS_CMP_DIFFERENT;
	70
	71	result = XFS_CMP_EXACT;
	72	for (i = 0; i < len; i++) {
	73	if (args->name[i] == name[i])
	74	continue;
	75	if (tolower(args->name[i]) != tolower(name[i]))
	76	return XFS_CMP_DIFFERENT;
	77	result = XFS_CMP_CASE;
	78	}
	79
	80	return result;
	81	}
	82
	83	static struct xfs_nameops xfs_ascii_ci_nameops = {
	84	.hashname = xfs_ascii_ci_hashname,
	85	.compname = xfs_ascii_ci_compname,
	86	};
	87
f6c2d1fa NS	88	void
	89	xfs_dir_mount(
	90	xfs_mount_t *mp)
1da177e4	91	{
37804376 DC	92	int nodehdr_size;
	93
	94
62118709	95	ASSERT(xfs_sb_version_hasdirv2(&mp->m_sb));
1da177e4 LT	96	ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
1da177e4 LT	97	XFS_MAX_BLOCKSIZE);
4bceb18f DC	98
	99	mp->m_dir_inode_ops = xfs_dir_get_ops(mp, NULL);
	100	mp->m_nondir_inode_ops = xfs_nondir_get_ops(mp, NULL);
	101
1da177e4 LT	102	mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
1da177e4 LT	103	mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
bbaaf538 CH	104	mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
	105	mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
	106	mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));
37804376	107
1c9a5b2e	108	nodehdr_size = mp->m_dir_inode_ops->node_hdr_size;
37804376 DC	109	mp->m_attr_node_ents = (mp->m_sb.sb_blocksize - nodehdr_size) /
	110	(uint)sizeof(xfs_da_node_entry_t);
	111	mp->m_dir_node_ents = (mp->m_dirblksize - nodehdr_size) /
	112	(uint)sizeof(xfs_da_node_entry_t);
	113
1da177e4	114	mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
189f4bf2 BN	115	if (xfs_sb_version_hasasciici(&mp->m_sb))
	116	mp->m_dirnameops = &xfs_ascii_ci_nameops;
	117	else
	118	mp->m_dirnameops = &xfs_default_nameops;
32c5483a	119
1da177e4 LT	120	}
	121
	122	/*
	123	* Return 1 if directory contains only "." and "..".
	124	*/
f6c2d1fa NS	125	int
	126	xfs_dir_isempty(
	127	xfs_inode_t *dp)
1da177e4	128	{
ac8ba50f	129	xfs_dir2_sf_hdr_t *sfp;
1da177e4	130
abbede1b	131	ASSERT(S_ISDIR(dp->i_d.di_mode));
f6c2d1fa	132	if (dp->i_d.di_size == 0) /* might happen during shutdown. */
1da177e4	133	return 1;
1da177e4 LT	134	if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
1da177e4 LT	135	return 0;
ac8ba50f CH	136	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
ac8ba50f CH	137	return !sfp->count;
1da177e4 LT	138	}
1da177e4 LT	139
f6c2d1fa NS	140	/*
	141	* Validate a given inode number.
	142	*/
	143	int
	144	xfs_dir_ino_validate(
	145	xfs_mount_t *mp,
	146	xfs_ino_t ino)
	147	{
	148	xfs_agblock_t agblkno;
	149	xfs_agino_t agino;
	150	xfs_agnumber_t agno;
	151	int ino_ok;
	152	int ioff;
	153
	154	agno = XFS_INO_TO_AGNO(mp, ino);
	155	agblkno = XFS_INO_TO_AGBNO(mp, ino);
	156	ioff = XFS_INO_TO_OFFSET(mp, ino);
	157	agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
	158	ino_ok =
	159	agno < mp->m_sb.sb_agcount &&
	160	agblkno < mp->m_sb.sb_agblocks &&
	161	agblkno != 0 &&
	162	ioff < (1 << mp->m_sb.sb_inopblog) &&
	163	XFS_AGINO_TO_INO(mp, agno, agino) == ino;
	164	if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
	165	XFS_RANDOM_DIR_INO_VALIDATE))) {
53487786	166	xfs_warn(mp, "Invalid inode number 0x%Lx",
f6c2d1fa NS	167	(unsigned long long) ino);
	168	XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
	169	return XFS_ERROR(EFSCORRUPTED);
	170	}
	171	return 0;
	172	}
	173
1da177e4 LT	174	/*
	175	* Initialize a directory with its "." and ".." entries.
	176	*/
f6c2d1fa NS	177	int
	178	xfs_dir_init(
	179	xfs_trans_t *tp,
	180	xfs_inode_t *dp,
	181	xfs_inode_t *pdp)
1da177e4	182	{
f6c2d1fa NS	183	xfs_da_args_t args;
f6c2d1fa NS	184	int error;
1da177e4 LT	185
	186	memset((char *)&args, 0, sizeof(args));
	187	args.dp = dp;
	188	args.trans = tp;
abbede1b	189	ASSERT(S_ISDIR(dp->i_d.di_mode));
f6c2d1fa	190	if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
1da177e4	191	return error;
1da177e4 LT	192	return xfs_dir2_sf_create(&args, pdp->i_ino);
	193	}
	194
	195	/*
	196	Enter a name in a directory.
	197	*/
f6c2d1fa NS	198	int
	199	xfs_dir_createname(
	200	xfs_trans_t *tp,
	201	xfs_inode_t *dp,
556b8b16	202	struct xfs_name *name,
1da177e4 LT	203	xfs_ino_t inum, /* new entry inode number */
	204	xfs_fsblock_t first, / bmap's firstblock */
	205	xfs_bmap_free_t flist, / bmap's freeblock list */
	206	xfs_extlen_t total) /* bmap's total block count */
	207	{
f6c2d1fa NS	208	xfs_da_args_t args;
f6c2d1fa NS	209	int rval;
1da177e4 LT	210	int v; /* type-checking value */
1da177e4 LT	211
abbede1b	212	ASSERT(S_ISDIR(dp->i_d.di_mode));
f6c2d1fa	213	if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
1da177e4	214	return rval;
1da177e4	215	XFS_STATS_INC(xs_dir_create);
f6c2d1fa	216
87affd08	217	memset(&args, 0, sizeof(xfs_da_args_t));
556b8b16 BN	218	args.name = name->name;
556b8b16 BN	219	args.namelen = name->len;
1c55cece	220	args.filetype = name->type;
5163f95a	221	args.hashval = dp->i_mount->m_dirnameops->hashname(name);
1da177e4 LT	222	args.inumber = inum;
	223	args.dp = dp;
	224	args.firstblock = first;
	225	args.flist = flist;
	226	args.total = total;
	227	args.whichfork = XFS_DATA_FORK;
	228	args.trans = tp;
6a178100	229	args.op_flags = XFS_DA_OP_ADDNAME \| XFS_DA_OP_OKNOENT;
f6c2d1fa	230
1da177e4 LT	231	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
1da177e4 LT	232	rval = xfs_dir2_sf_addname(&args);
f6c2d1fa	233	else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
1da177e4	234	return rval;
f6c2d1fa	235	else if (v)
1da177e4	236	rval = xfs_dir2_block_addname(&args);
f6c2d1fa	237	else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
1da177e4	238	return rval;
f6c2d1fa	239	else if (v)
1da177e4 LT	240	rval = xfs_dir2_leaf_addname(&args);
	241	else
	242	rval = xfs_dir2_node_addname(&args);
	243	return rval;
	244	}
	245
384f3ced BN	246	/*
	247	* If doing a CI lookup and case-insensitive match, dup actual name into
	248	* args.value. Return EEXIST for success (ie. name found) or an error.
	249	*/
	250	int
	251	xfs_dir_cilookup_result(
	252	struct xfs_da_args *args,
a3380ae3	253	const unsigned char *name,
384f3ced BN	254	int len)
	255	{
	256	if (args->cmpresult == XFS_CMP_DIFFERENT)
	257	return ENOENT;
	258	if (args->cmpresult != XFS_CMP_CASE \|\|
	259	!(args->op_flags & XFS_DA_OP_CILOOKUP))
	260	return EEXIST;
	261
3f52c2f0	262	args->value = kmem_alloc(len, KM_NOFS \| KM_MAYFAIL);
384f3ced BN	263	if (!args->value)
	264	return ENOMEM;
	265
	266	memcpy(args->value, name, len);
	267	args->valuelen = len;
	268	return EEXIST;
	269	}
	270
1da177e4 LT	271	/*
1da177e4 LT	272	* Lookup a name in a directory, give back the inode number.
384f3ced BN	273	* If ci_name is not NULL, returns the actual name in ci_name if it differs
384f3ced BN	274	* to name, or ci_name->name is set to NULL for an exact match.
1da177e4	275	*/
384f3ced	276
f6c2d1fa NS	277	int
	278	xfs_dir_lookup(
	279	xfs_trans_t *tp,
	280	xfs_inode_t *dp,
556b8b16	281	struct xfs_name *name,
384f3ced BN	282	xfs_ino_t inum, / out: inode number */
384f3ced BN	283	struct xfs_name ci_name) / out: actual name if CI match */
1da177e4	284	{
f6c2d1fa NS	285	xfs_da_args_t args;
f6c2d1fa NS	286	int rval;
1da177e4 LT	287	int v; /* type-checking value */
1da177e4 LT	288
abbede1b	289	ASSERT(S_ISDIR(dp->i_d.di_mode));
1da177e4 LT	290	XFS_STATS_INC(xs_dir_lookup);
1da177e4 LT	291
87affd08	292	memset(&args, 0, sizeof(xfs_da_args_t));
556b8b16 BN	293	args.name = name->name;
556b8b16 BN	294	args.namelen = name->len;
1c55cece	295	args.filetype = name->type;
5163f95a	296	args.hashval = dp->i_mount->m_dirnameops->hashname(name);
1da177e4	297	args.dp = dp;
1da177e4 LT	298	args.whichfork = XFS_DATA_FORK;
1da177e4 LT	299	args.trans = tp;
6a178100	300	args.op_flags = XFS_DA_OP_OKNOENT;
384f3ced BN	301	if (ci_name)
384f3ced BN	302	args.op_flags \|= XFS_DA_OP_CILOOKUP;
f6c2d1fa	303
1da177e4 LT	304	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
1da177e4 LT	305	rval = xfs_dir2_sf_lookup(&args);
f6c2d1fa	306	else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
1da177e4	307	return rval;
f6c2d1fa	308	else if (v)
1da177e4	309	rval = xfs_dir2_block_lookup(&args);
f6c2d1fa	310	else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
1da177e4	311	return rval;
f6c2d1fa	312	else if (v)
1da177e4 LT	313	rval = xfs_dir2_leaf_lookup(&args);
	314	else
	315	rval = xfs_dir2_node_lookup(&args);
	316	if (rval == EEXIST)
	317	rval = 0;
384f3ced	318	if (!rval) {
1da177e4	319	*inum = args.inumber;
384f3ced BN	320	if (ci_name) {
	321	ci_name->name = args.value;
	322	ci_name->len = args.valuelen;
	323	}
	324	}
1da177e4 LT	325	return rval;
	326	}
	327
	328	/*
	329	* Remove an entry from a directory.
	330	*/
f6c2d1fa NS	331	int
	332	xfs_dir_removename(
	333	xfs_trans_t *tp,
	334	xfs_inode_t *dp,
556b8b16	335	struct xfs_name *name,
f6c2d1fa	336	xfs_ino_t ino,
1da177e4 LT	337	xfs_fsblock_t first, / bmap's firstblock */
	338	xfs_bmap_free_t flist, / bmap's freeblock list */
	339	xfs_extlen_t total) /* bmap's total block count */
	340	{
f6c2d1fa NS	341	xfs_da_args_t args;
f6c2d1fa NS	342	int rval;
1da177e4 LT	343	int v; /* type-checking value */
1da177e4 LT	344
abbede1b	345	ASSERT(S_ISDIR(dp->i_d.di_mode));
1da177e4	346	XFS_STATS_INC(xs_dir_remove);
f6c2d1fa	347
87affd08	348	memset(&args, 0, sizeof(xfs_da_args_t));
556b8b16 BN	349	args.name = name->name;
556b8b16 BN	350	args.namelen = name->len;
1c55cece	351	args.filetype = name->type;
5163f95a	352	args.hashval = dp->i_mount->m_dirnameops->hashname(name);
1da177e4 LT	353	args.inumber = ino;
	354	args.dp = dp;
	355	args.firstblock = first;
	356	args.flist = flist;
	357	args.total = total;
	358	args.whichfork = XFS_DATA_FORK;
	359	args.trans = tp;
f6c2d1fa	360
1da177e4 LT	361	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
1da177e4 LT	362	rval = xfs_dir2_sf_removename(&args);
f6c2d1fa	363	else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
1da177e4	364	return rval;
f6c2d1fa	365	else if (v)
1da177e4	366	rval = xfs_dir2_block_removename(&args);
f6c2d1fa	367	else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
1da177e4	368	return rval;
f6c2d1fa	369	else if (v)
1da177e4 LT	370	rval = xfs_dir2_leaf_removename(&args);
	371	else
	372	rval = xfs_dir2_node_removename(&args);
	373	return rval;
	374	}
	375
1da177e4 LT	376	/*
	377	* Replace the inode number of a directory entry.
	378	*/
f6c2d1fa NS	379	int
	380	xfs_dir_replace(
	381	xfs_trans_t *tp,
	382	xfs_inode_t *dp,
556b8b16	383	struct xfs_name name, / name of entry to replace */
1da177e4 LT	384	xfs_ino_t inum, /* new inode number */
	385	xfs_fsblock_t first, / bmap's firstblock */
	386	xfs_bmap_free_t flist, / bmap's freeblock list */
	387	xfs_extlen_t total) /* bmap's total block count */
	388	{
f6c2d1fa NS	389	xfs_da_args_t args;
f6c2d1fa NS	390	int rval;
1da177e4 LT	391	int v; /* type-checking value */
1da177e4 LT	392
abbede1b	393	ASSERT(S_ISDIR(dp->i_d.di_mode));
1da177e4	394
f6c2d1fa	395	if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
1da177e4	396	return rval;
f6c2d1fa	397
87affd08	398	memset(&args, 0, sizeof(xfs_da_args_t));
556b8b16 BN	399	args.name = name->name;
556b8b16 BN	400	args.namelen = name->len;
0cb97766	401	args.filetype = name->type;
5163f95a	402	args.hashval = dp->i_mount->m_dirnameops->hashname(name);
1da177e4 LT	403	args.inumber = inum;
	404	args.dp = dp;
	405	args.firstblock = first;
	406	args.flist = flist;
	407	args.total = total;
	408	args.whichfork = XFS_DATA_FORK;
	409	args.trans = tp;
f6c2d1fa	410
1da177e4 LT	411	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
1da177e4 LT	412	rval = xfs_dir2_sf_replace(&args);
f6c2d1fa	413	else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
1da177e4	414	return rval;
f6c2d1fa	415	else if (v)
1da177e4	416	rval = xfs_dir2_block_replace(&args);
f6c2d1fa	417	else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
1da177e4	418	return rval;
f6c2d1fa	419	else if (v)
1da177e4 LT	420	rval = xfs_dir2_leaf_replace(&args);
	421	else
	422	rval = xfs_dir2_node_replace(&args);
	423	return rval;
	424	}
	425
	426	/*
	427	* See if this entry can be added to the directory without allocating space.
556b8b16	428	* First checks that the caller couldn't reserve enough space (resblks = 0).
1da177e4	429	*/
f6c2d1fa NS	430	int
	431	xfs_dir_canenter(
	432	xfs_trans_t *tp,
	433	xfs_inode_t *dp,
556b8b16 BN	434	struct xfs_name name, / name of entry to add */
556b8b16 BN	435	uint resblks)
1da177e4	436	{
f6c2d1fa NS	437	xfs_da_args_t args;
f6c2d1fa NS	438	int rval;
1da177e4 LT	439	int v; /* type-checking value */
1da177e4 LT	440
556b8b16 BN	441	if (resblks)
	442	return 0;
	443
abbede1b	444	ASSERT(S_ISDIR(dp->i_d.di_mode));
f6c2d1fa	445
87affd08	446	memset(&args, 0, sizeof(xfs_da_args_t));
556b8b16 BN	447	args.name = name->name;
556b8b16 BN	448	args.namelen = name->len;
0cb97766	449	args.filetype = name->type;
5163f95a	450	args.hashval = dp->i_mount->m_dirnameops->hashname(name);
1da177e4	451	args.dp = dp;
1da177e4 LT	452	args.whichfork = XFS_DATA_FORK;
1da177e4 LT	453	args.trans = tp;
6a178100 BN	454	args.op_flags = XFS_DA_OP_JUSTCHECK \| XFS_DA_OP_ADDNAME \|
6a178100 BN	455	XFS_DA_OP_OKNOENT;
f6c2d1fa	456
1da177e4 LT	457	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
1da177e4 LT	458	rval = xfs_dir2_sf_addname(&args);
f6c2d1fa	459	else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
1da177e4	460	return rval;
f6c2d1fa	461	else if (v)
1da177e4	462	rval = xfs_dir2_block_addname(&args);
f6c2d1fa	463	else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
1da177e4	464	return rval;
f6c2d1fa	465	else if (v)
1da177e4 LT	466	rval = xfs_dir2_leaf_addname(&args);
	467	else
	468	rval = xfs_dir2_node_addname(&args);
	469	return rval;
	470	}
	471
1da177e4 LT	472	/*
	473	* Utility routines.
	474	*/
	475
	476	/*
	477	* Add a block to the directory.
77936d02 CH	478	*
	479	* This routine is for data and free blocks, not leaf/node blocks which are
	480	* handled by xfs_da_grow_inode.
1da177e4	481	*/
f6c2d1fa	482	int
1da177e4	483	xfs_dir2_grow_inode(
77936d02 CH	484	struct xfs_da_args *args,
	485	int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
	486	xfs_dir2_db_t dbp) / out: block number added */
1da177e4	487	{
77936d02 CH	488	struct xfs_inode *dp = args->dp;
	489	struct xfs_mount *mp = dp->i_mount;
	490	xfs_fileoff_t bno; /* directory offset of new block */
	491	int count; /* count of filesystem blocks */
	492	int error;
1da177e4	493
0b1b213f CH	494	trace_xfs_dir2_grow_inode(args, space);
0b1b213f CH	495
1da177e4 LT	496	/*
	497	* Set lowest possible block in the space requested.
	498	*/
	499	bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
	500	count = mp->m_dirblkfsbs;
77936d02 CH	501
	502	error = xfs_da_grow_inode_int(args, &bno, count);
	503	if (error)
1da177e4	504	return error;
a7444053	505
bbaaf538	506	*dbp = xfs_dir2_da_to_db(mp, (xfs_dablk_t)bno);
a7444053	507
1da177e4 LT	508	/*
	509	* Update file's size if this is the data space and it grew.
	510	*/
	511	if (space == XFS_DIR2_DATA_SPACE) {
	512	xfs_fsize_t size; /* directory file (data) size */
	513
	514	size = XFS_FSB_TO_B(mp, bno + count);
	515	if (size > dp->i_d.di_size) {
	516	dp->i_d.di_size = size;
77936d02	517	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
1da177e4 LT	518	}
	519	}
	520	return 0;
	521	}
	522
	523	/*
	524	* See if the directory is a single-block form directory.
	525	*/
f6c2d1fa	526	int
1da177e4	527	xfs_dir2_isblock(
f6c2d1fa NS	528	xfs_trans_t *tp,
f6c2d1fa NS	529	xfs_inode_t *dp,
1da177e4 LT	530	int vp) / out: 1 is block, 0 is not block */
	531	{
	532	xfs_fileoff_t last; /* last file offset */
f6c2d1fa NS	533	xfs_mount_t *mp;
f6c2d1fa NS	534	int rval;
1da177e4 LT	535
1da177e4 LT	536	mp = dp->i_mount;
f6c2d1fa	537	if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
1da177e4	538	return rval;
1da177e4 LT	539	rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
	540	ASSERT(rval == 0 \|\| dp->i_d.di_size == mp->m_dirblksize);
	541	*vp = rval;
	542	return 0;
	543	}
	544
	545	/*
	546	* See if the directory is a single-leaf form directory.
	547	*/
f6c2d1fa	548	int
1da177e4	549	xfs_dir2_isleaf(
f6c2d1fa NS	550	xfs_trans_t *tp,
f6c2d1fa NS	551	xfs_inode_t *dp,
1da177e4 LT	552	int vp) / out: 1 is leaf, 0 is not leaf */
	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	*vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
	562	return 0;
	563	}
	564
1da177e4 LT	565	/*
	566	* Remove the given block from the directory.
	567	* This routine is used for data and free blocks, leaf/node are done
	568	* by xfs_da_shrink_inode.
	569	*/
	570	int
	571	xfs_dir2_shrink_inode(
f6c2d1fa NS	572	xfs_da_args_t *args,
f6c2d1fa NS	573	xfs_dir2_db_t db,
1d9025e5	574	struct xfs_buf *bp)
1da177e4 LT	575	{
	576	xfs_fileoff_t bno; /* directory file offset */
	577	xfs_dablk_t da; /* directory file offset */
	578	int done; /* bunmap is finished */
f6c2d1fa NS	579	xfs_inode_t *dp;
	580	int error;
	581	xfs_mount_t *mp;
	582	xfs_trans_t *tp;
1da177e4	583
0b1b213f CH	584	trace_xfs_dir2_shrink_inode(args, db);
0b1b213f CH	585
1da177e4 LT	586	dp = args->dp;
	587	mp = dp->i_mount;
	588	tp = args->trans;
bbaaf538	589	da = xfs_dir2_db_to_da(mp, db);
1da177e4 LT	590	/*
	591	* Unmap the fsblock(s).
	592	*/
	593	if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
	594	XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
b4e9181e	595	&done))) {
1da177e4 LT	596	/*
	597	* ENOSPC actually can happen if we're in a removename with
	598	* no space reservation, and the resulting block removal
	599	* would cause a bmap btree split or conversion from extents
	600	* to btree. This can only happen for un-fragmented
	601	* directory blocks, since you need to be punching out
	602	* the middle of an extent.
	603	* In this case we need to leave the block in the file,
	604	* and not binval it.
	605	* So the block has to be in a consistent empty state
	606	* and appropriately logged.
	607	* We don't free up the buffer, the caller can tell it
	608	* hasn't happened since it got an error back.
	609	*/
	610	return error;
	611	}
	612	ASSERT(done);
	613	/*
	614	* Invalidate the buffer from the transaction.
	615	*/
1d9025e5	616	xfs_trans_binval(tp, bp);
1da177e4 LT	617	/*
	618	* If it's not a data block, we're done.
	619	*/
	620	if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
	621	return 0;
	622	/*
	623	* If the block isn't the last one in the directory, we're done.
	624	*/
bbaaf538	625	if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(mp, db + 1, 0))
1da177e4 LT	626	return 0;
	627	bno = da;
	628	if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
	629	/*
	630	* This can't really happen unless there's kernel corruption.
	631	*/
	632	return error;
	633	}
	634	if (db == mp->m_dirdatablk)
	635	ASSERT(bno == 0);
	636	else
	637	ASSERT(bno > 0);
	638	/*
	639	* Set the size to the new last block.
	640	*/
	641	dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
	642	xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
	643	return 0;
	644	}