fs/xfs/xfs_dir2.c - fp2-dev/kernel/msm - Gitiles

 /*
  * 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"


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

 	vn_trace_entry(BHV_TO_VNODE(dir_bdp), __FUNCTION__,
 					       (inst_t *)__return_address);

 	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;
 }
	/*
	* 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"


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

	vn_trace_entry(BHV_TO_VNODE(dir_bdp), __FUNCTION__,
	(inst_t *)__return_address);

	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;
	}