patch-2.4.25 linux-2.4.25/fs/xfs/xfs_da_btree.c
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- Lines: 2651
- Date:
2004-02-18 05:36:32.000000000 -0800
- Orig file:
linux-2.4.24/fs/xfs/xfs_da_btree.c
- Orig date:
1969-12-31 16:00:00.000000000 -0800
diff -urN linux-2.4.24/fs/xfs/xfs_da_btree.c linux-2.4.25/fs/xfs/xfs_da_btree.c
@@ -0,0 +1,2650 @@
+/*
+ * Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like. Any license provided herein, whether implied or
+ * otherwise, applies only to this software file. Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA 94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+
+#include "xfs.h"
+
+#include "xfs_macros.h"
+#include "xfs_types.h"
+#include "xfs_inum.h"
+#include "xfs_log.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_ag.h"
+#include "xfs_dir.h"
+#include "xfs_dir2.h"
+#include "xfs_dmapi.h"
+#include "xfs_mount.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_alloc.h"
+#include "xfs_btree.h"
+#include "xfs_attr_sf.h"
+#include "xfs_dir_sf.h"
+#include "xfs_dir2_sf.h"
+#include "xfs_dinode.h"
+#include "xfs_inode_item.h"
+#include "xfs_inode.h"
+#include "xfs_bmap.h"
+#include "xfs_da_btree.h"
+#include "xfs_attr.h"
+#include "xfs_attr_leaf.h"
+#include "xfs_dir_leaf.h"
+#include "xfs_dir2_data.h"
+#include "xfs_dir2_leaf.h"
+#include "xfs_dir2_block.h"
+#include "xfs_dir2_node.h"
+#include "xfs_error.h"
+#include "xfs_bit.h"
+
+/*
+ * xfs_da_btree.c
+ *
+ * Routines to implement directories as Btrees of hashed names.
+ */
+
+/*========================================================================
+ * Function prototypes for the kernel.
+ *========================================================================*/
+
+/*
+ * Routines used for growing the Btree.
+ */
+STATIC int xfs_da_root_split(xfs_da_state_t *state,
+ xfs_da_state_blk_t *existing_root,
+ xfs_da_state_blk_t *new_child);
+STATIC int xfs_da_node_split(xfs_da_state_t *state,
+ xfs_da_state_blk_t *existing_blk,
+ xfs_da_state_blk_t *split_blk,
+ xfs_da_state_blk_t *blk_to_add,
+ int treelevel,
+ int *result);
+STATIC void xfs_da_node_rebalance(xfs_da_state_t *state,
+ xfs_da_state_blk_t *node_blk_1,
+ xfs_da_state_blk_t *node_blk_2);
+STATIC void xfs_da_node_add(xfs_da_state_t *state,
+ xfs_da_state_blk_t *old_node_blk,
+ xfs_da_state_blk_t *new_node_blk);
+
+/*
+ * Routines used for shrinking the Btree.
+ */
+STATIC int xfs_da_root_join(xfs_da_state_t *state,
+ xfs_da_state_blk_t *root_blk);
+STATIC int xfs_da_node_toosmall(xfs_da_state_t *state, int *retval);
+STATIC void xfs_da_node_remove(xfs_da_state_t *state,
+ xfs_da_state_blk_t *drop_blk);
+STATIC void xfs_da_node_unbalance(xfs_da_state_t *state,
+ xfs_da_state_blk_t *src_node_blk,
+ xfs_da_state_blk_t *dst_node_blk);
+
+/*
+ * Utility routines.
+ */
+STATIC uint xfs_da_node_lasthash(xfs_dabuf_t *bp, int *count);
+STATIC int xfs_da_node_order(xfs_dabuf_t *node1_bp, xfs_dabuf_t *node2_bp);
+STATIC xfs_dabuf_t *xfs_da_buf_make(int nbuf, xfs_buf_t **bps, inst_t *ra);
+
+
+/*========================================================================
+ * Routines used for growing the Btree.
+ *========================================================================*/
+
+/*
+ * Create the initial contents of an intermediate node.
+ */
+int
+xfs_da_node_create(xfs_da_args_t *args, xfs_dablk_t blkno, int level,
+ xfs_dabuf_t **bpp, int whichfork)
+{
+ xfs_da_intnode_t *node;
+ xfs_dabuf_t *bp;
+ int error;
+ xfs_trans_t *tp;
+
+ tp = args->trans;
+ error = xfs_da_get_buf(tp, args->dp, blkno, -1, &bp, whichfork);
+ if (error)
+ return(error);
+ ASSERT(bp != NULL);
+ node = bp->data;
+ INT_ZERO(node->hdr.info.forw, ARCH_CONVERT);
+ INT_ZERO(node->hdr.info.back, ARCH_CONVERT);
+ INT_SET(node->hdr.info.magic, ARCH_CONVERT, XFS_DA_NODE_MAGIC);
+ INT_ZERO(node->hdr.info.pad, ARCH_CONVERT);
+ INT_ZERO(node->hdr.count, ARCH_CONVERT);
+ INT_SET(node->hdr.level, ARCH_CONVERT, level);
+
+ xfs_da_log_buf(tp, bp,
+ XFS_DA_LOGRANGE(node, &node->hdr, sizeof(node->hdr)));
+
+ *bpp = bp;
+ return(0);
+}
+
+/*
+ * Split a leaf node, rebalance, then possibly split
+ * intermediate nodes, rebalance, etc.
+ */
+int /* error */
+xfs_da_split(xfs_da_state_t *state)
+{
+ xfs_da_state_blk_t *oldblk, *newblk, *addblk;
+ xfs_da_intnode_t *node;
+ xfs_dabuf_t *bp;
+ int max, action, error, i;
+
+ /*
+ * Walk back up the tree splitting/inserting/adjusting as necessary.
+ * If we need to insert and there isn't room, split the node, then
+ * decide which fragment to insert the new block from below into.
+ * Note that we may split the root this way, but we need more fixup.
+ */
+ max = state->path.active - 1;
+ ASSERT((max >= 0) && (max < XFS_DA_NODE_MAXDEPTH));
+ ASSERT(state->path.blk[max].magic == XFS_ATTR_LEAF_MAGIC ||
+ state->path.blk[max].magic == XFS_DIRX_LEAF_MAGIC(state->mp));
+
+ addblk = &state->path.blk[max]; /* initial dummy value */
+ for (i = max; (i >= 0) && addblk; state->path.active--, i--) {
+ oldblk = &state->path.blk[i];
+ newblk = &state->altpath.blk[i];
+
+ /*
+ * If a leaf node then
+ * Allocate a new leaf node, then rebalance across them.
+ * else if an intermediate node then
+ * We split on the last layer, must we split the node?
+ */
+ switch (oldblk->magic) {
+ case XFS_ATTR_LEAF_MAGIC:
+#ifndef __KERNEL__
+ return(ENOTTY);
+#else
+ error = xfs_attr_leaf_split(state, oldblk, newblk);
+ if ((error != 0) && (error != ENOSPC)) {
+ return(error); /* GROT: attr is inconsistent */
+ }
+ if (!error) {
+ addblk = newblk;
+ break;
+ }
+ /*
+ * Entry wouldn't fit, split the leaf again.
+ */
+ state->extravalid = 1;
+ if (state->inleaf) {
+ state->extraafter = 0; /* before newblk */
+ error = xfs_attr_leaf_split(state, oldblk,
+ &state->extrablk);
+ } else {
+ state->extraafter = 1; /* after newblk */
+ error = xfs_attr_leaf_split(state, newblk,
+ &state->extrablk);
+ }
+ if (error)
+ return(error); /* GROT: attr inconsistent */
+ addblk = newblk;
+ break;
+#endif
+ case XFS_DIR_LEAF_MAGIC:
+ ASSERT(XFS_DIR_IS_V1(state->mp));
+ error = xfs_dir_leaf_split(state, oldblk, newblk);
+ if ((error != 0) && (error != ENOSPC)) {
+ return(error); /* GROT: dir is inconsistent */
+ }
+ if (!error) {
+ addblk = newblk;
+ break;
+ }
+ /*
+ * Entry wouldn't fit, split the leaf again.
+ */
+ state->extravalid = 1;
+ if (state->inleaf) {
+ state->extraafter = 0; /* before newblk */
+ error = xfs_dir_leaf_split(state, oldblk,
+ &state->extrablk);
+ if (error)
+ return(error); /* GROT: dir incon. */
+ addblk = newblk;
+ } else {
+ state->extraafter = 1; /* after newblk */
+ error = xfs_dir_leaf_split(state, newblk,
+ &state->extrablk);
+ if (error)
+ return(error); /* GROT: dir incon. */
+ addblk = newblk;
+ }
+ break;
+ case XFS_DIR2_LEAFN_MAGIC:
+ ASSERT(XFS_DIR_IS_V2(state->mp));
+ error = xfs_dir2_leafn_split(state, oldblk, newblk);
+ if (error)
+ return error;
+ addblk = newblk;
+ break;
+ case XFS_DA_NODE_MAGIC:
+ error = xfs_da_node_split(state, oldblk, newblk, addblk,
+ max - i, &action);
+ xfs_da_buf_done(addblk->bp);
+ addblk->bp = NULL;
+ if (error)
+ return(error); /* GROT: dir is inconsistent */
+ /*
+ * Record the newly split block for the next time thru?
+ */
+ if (action)
+ addblk = newblk;
+ else
+ addblk = NULL;
+ break;
+ }
+
+ /*
+ * Update the btree to show the new hashval for this child.
+ */
+ xfs_da_fixhashpath(state, &state->path);
+ /*
+ * If we won't need this block again, it's getting dropped
+ * from the active path by the loop control, so we need
+ * to mark it done now.
+ */
+ if (i > 0 || !addblk)
+ xfs_da_buf_done(oldblk->bp);
+ }
+ if (!addblk)
+ return(0);
+
+ /*
+ * Split the root node.
+ */
+ ASSERT(state->path.active == 0);
+ oldblk = &state->path.blk[0];
+ error = xfs_da_root_split(state, oldblk, addblk);
+ if (error) {
+ xfs_da_buf_done(oldblk->bp);
+ xfs_da_buf_done(addblk->bp);
+ addblk->bp = NULL;
+ return(error); /* GROT: dir is inconsistent */
+ }
+
+ /*
+ * Update pointers to the node which used to be block 0 and
+ * just got bumped because of the addition of a new root node.
+ * There might be three blocks involved if a double split occurred,
+ * and the original block 0 could be at any position in the list.
+ */
+
+ node = oldblk->bp->data;
+ if (!INT_ISZERO(node->hdr.info.forw, ARCH_CONVERT)) {
+ if (INT_GET(node->hdr.info.forw, ARCH_CONVERT) == addblk->blkno) {
+ bp = addblk->bp;
+ } else {
+ ASSERT(state->extravalid);
+ bp = state->extrablk.bp;
+ }
+ node = bp->data;
+ INT_SET(node->hdr.info.back, ARCH_CONVERT, oldblk->blkno);
+ xfs_da_log_buf(state->args->trans, bp,
+ XFS_DA_LOGRANGE(node, &node->hdr.info,
+ sizeof(node->hdr.info)));
+ }
+ node = oldblk->bp->data;
+ if (INT_GET(node->hdr.info.back, ARCH_CONVERT)) {
+ if (INT_GET(node->hdr.info.back, ARCH_CONVERT) == addblk->blkno) {
+ bp = addblk->bp;
+ } else {
+ ASSERT(state->extravalid);
+ bp = state->extrablk.bp;
+ }
+ node = bp->data;
+ INT_SET(node->hdr.info.forw, ARCH_CONVERT, oldblk->blkno);
+ xfs_da_log_buf(state->args->trans, bp,
+ XFS_DA_LOGRANGE(node, &node->hdr.info,
+ sizeof(node->hdr.info)));
+ }
+ xfs_da_buf_done(oldblk->bp);
+ xfs_da_buf_done(addblk->bp);
+ addblk->bp = NULL;
+ return(0);
+}
+
+/*
+ * Split the root. We have to create a new root and point to the two
+ * parts (the split old root) that we just created. Copy block zero to
+ * the EOF, extending the inode in process.
+ */
+STATIC int /* error */
+xfs_da_root_split(xfs_da_state_t *state, xfs_da_state_blk_t *blk1,
+ xfs_da_state_blk_t *blk2)
+{
+ xfs_da_intnode_t *node, *oldroot;
+ xfs_da_args_t *args;
+ xfs_dablk_t blkno;
+ xfs_dabuf_t *bp;
+ int error, size;
+ xfs_inode_t *dp;
+ xfs_trans_t *tp;
+ xfs_mount_t *mp;
+ xfs_dir2_leaf_t *leaf;
+
+ /*
+ * Copy the existing (incorrect) block from the root node position
+ * to a free space somewhere.
+ */
+ args = state->args;
+ ASSERT(args != NULL);
+ error = xfs_da_grow_inode(args, &blkno);
+ if (error)
+ return(error);
+ dp = args->dp;
+ tp = args->trans;
+ mp = state->mp;
+ error = xfs_da_get_buf(tp, dp, blkno, -1, &bp, args->whichfork);
+ if (error)
+ return(error);
+ ASSERT(bp != NULL);
+ node = bp->data;
+ oldroot = blk1->bp->data;
+ if (INT_GET(oldroot->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC) {
+ size = (int)((char *)&oldroot->btree[INT_GET(oldroot->hdr.count, ARCH_CONVERT)] -
+ (char *)oldroot);
+ } else {
+ ASSERT(XFS_DIR_IS_V2(mp));
+ ASSERT(INT_GET(oldroot->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC);
+ leaf = (xfs_dir2_leaf_t *)oldroot;
+ size = (int)((char *)&leaf->ents[INT_GET(leaf->hdr.count, ARCH_CONVERT)] -
+ (char *)leaf);
+ }
+ memcpy(node, oldroot, size);
+ xfs_da_log_buf(tp, bp, 0, size - 1);
+ xfs_da_buf_done(blk1->bp);
+ blk1->bp = bp;
+ blk1->blkno = blkno;
+
+ /*
+ * Set up the new root node.
+ */
+ error = xfs_da_node_create(args,
+ args->whichfork == XFS_DATA_FORK &&
+ XFS_DIR_IS_V2(mp) ? mp->m_dirleafblk : 0,
+ INT_GET(node->hdr.level, ARCH_CONVERT) + 1, &bp, args->whichfork);
+ if (error)
+ return(error);
+ node = bp->data;
+ INT_SET(node->btree[0].hashval, ARCH_CONVERT, blk1->hashval);
+ INT_SET(node->btree[0].before, ARCH_CONVERT, blk1->blkno);
+ INT_SET(node->btree[1].hashval, ARCH_CONVERT, blk2->hashval);
+ INT_SET(node->btree[1].before, ARCH_CONVERT, blk2->blkno);
+ INT_SET(node->hdr.count, ARCH_CONVERT, 2);
+
+#ifdef DEBUG
+ if (INT_GET(oldroot->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC) {
+ ASSERT(blk1->blkno >= mp->m_dirleafblk &&
+ blk1->blkno < mp->m_dirfreeblk);
+ ASSERT(blk2->blkno >= mp->m_dirleafblk &&
+ blk2->blkno < mp->m_dirfreeblk);
+ }
+#endif
+
+ /* Header is already logged by xfs_da_node_create */
+ xfs_da_log_buf(tp, bp,
+ XFS_DA_LOGRANGE(node, node->btree,
+ sizeof(xfs_da_node_entry_t) * 2));
+ xfs_da_buf_done(bp);
+
+ return(0);
+}
+
+/*
+ * Split the node, rebalance, then add the new entry.
+ */
+STATIC int /* error */
+xfs_da_node_split(xfs_da_state_t *state, xfs_da_state_blk_t *oldblk,
+ xfs_da_state_blk_t *newblk,
+ xfs_da_state_blk_t *addblk,
+ int treelevel, int *result)
+{
+ xfs_da_intnode_t *node;
+ xfs_dablk_t blkno;
+ int newcount, error;
+ int useextra;
+
+ node = oldblk->bp->data;
+ ASSERT(INT_GET(node->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC);
+
+ /*
+ * With V2 the extra block is data or freespace.
+ */
+ useextra = state->extravalid && XFS_DIR_IS_V1(state->mp);
+ newcount = 1 + useextra;
+ /*
+ * Do we have to split the node?
+ */
+ if ((INT_GET(node->hdr.count, ARCH_CONVERT) + newcount) > state->node_ents) {
+ /*
+ * Allocate a new node, add to the doubly linked chain of
+ * nodes, then move some of our excess entries into it.
+ */
+ error = xfs_da_grow_inode(state->args, &blkno);
+ if (error)
+ return(error); /* GROT: dir is inconsistent */
+
+ error = xfs_da_node_create(state->args, blkno, treelevel,
+ &newblk->bp, state->args->whichfork);
+ if (error)
+ return(error); /* GROT: dir is inconsistent */
+ newblk->blkno = blkno;
+ newblk->magic = XFS_DA_NODE_MAGIC;
+ xfs_da_node_rebalance(state, oldblk, newblk);
+ error = xfs_da_blk_link(state, oldblk, newblk);
+ if (error)
+ return(error);
+ *result = 1;
+ } else {
+ *result = 0;
+ }
+
+ /*
+ * Insert the new entry(s) into the correct block
+ * (updating last hashval in the process).
+ *
+ * xfs_da_node_add() inserts BEFORE the given index,
+ * and as a result of using node_lookup_int() we always
+ * point to a valid entry (not after one), but a split
+ * operation always results in a new block whose hashvals
+ * FOLLOW the current block.
+ *
+ * If we had double-split op below us, then add the extra block too.
+ */
+ node = oldblk->bp->data;
+ if (oldblk->index <= INT_GET(node->hdr.count, ARCH_CONVERT)) {
+ oldblk->index++;
+ xfs_da_node_add(state, oldblk, addblk);
+ if (useextra) {
+ if (state->extraafter)
+ oldblk->index++;
+ xfs_da_node_add(state, oldblk, &state->extrablk);
+ state->extravalid = 0;
+ }
+ } else {
+ newblk->index++;
+ xfs_da_node_add(state, newblk, addblk);
+ if (useextra) {
+ if (state->extraafter)
+ newblk->index++;
+ xfs_da_node_add(state, newblk, &state->extrablk);
+ state->extravalid = 0;
+ }
+ }
+
+ return(0);
+}
+
+/*
+ * Balance the btree elements between two intermediate nodes,
+ * usually one full and one empty.
+ *
+ * NOTE: if blk2 is empty, then it will get the upper half of blk1.
+ */
+STATIC void
+xfs_da_node_rebalance(xfs_da_state_t *state, xfs_da_state_blk_t *blk1,
+ xfs_da_state_blk_t *blk2)
+{
+ xfs_da_intnode_t *node1, *node2, *tmpnode;
+ xfs_da_node_entry_t *btree_s, *btree_d;
+ int count, tmp;
+ xfs_trans_t *tp;
+
+ node1 = blk1->bp->data;
+ node2 = blk2->bp->data;
+ /*
+ * Figure out how many entries need to move, and in which direction.
+ * Swap the nodes around if that makes it simpler.
+ */
+ if ((INT_GET(node1->hdr.count, ARCH_CONVERT) > 0) && (INT_GET(node2->hdr.count, ARCH_CONVERT) > 0) &&
+ ((INT_GET(node2->btree[ 0 ].hashval, ARCH_CONVERT) < INT_GET(node1->btree[ 0 ].hashval, ARCH_CONVERT)) ||
+ (INT_GET(node2->btree[ INT_GET(node2->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT) <
+ INT_GET(node1->btree[ INT_GET(node1->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT)))) {
+ tmpnode = node1;
+ node1 = node2;
+ node2 = tmpnode;
+ }
+ ASSERT(INT_GET(node1->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC);
+ ASSERT(INT_GET(node2->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC);
+ count = (INT_GET(node1->hdr.count, ARCH_CONVERT) - INT_GET(node2->hdr.count, ARCH_CONVERT)) / 2;
+ if (count == 0)
+ return;
+ tp = state->args->trans;
+ /*
+ * Two cases: high-to-low and low-to-high.
+ */
+ if (count > 0) {
+ /*
+ * Move elements in node2 up to make a hole.
+ */
+ if ((tmp = INT_GET(node2->hdr.count, ARCH_CONVERT)) > 0) {
+ tmp *= (uint)sizeof(xfs_da_node_entry_t);
+ btree_s = &node2->btree[0];
+ btree_d = &node2->btree[count];
+ memmove(btree_d, btree_s, tmp);
+ }
+
+ /*
+ * Move the req'd B-tree elements from high in node1 to
+ * low in node2.
+ */
+ INT_MOD(node2->hdr.count, ARCH_CONVERT, count);
+ tmp = count * (uint)sizeof(xfs_da_node_entry_t);
+ btree_s = &node1->btree[INT_GET(node1->hdr.count, ARCH_CONVERT) - count];
+ btree_d = &node2->btree[0];
+ memcpy(btree_d, btree_s, tmp);
+ INT_MOD(node1->hdr.count, ARCH_CONVERT, -(count));
+
+ } else {
+ /*
+ * Move the req'd B-tree elements from low in node2 to
+ * high in node1.
+ */
+ count = -count;
+ tmp = count * (uint)sizeof(xfs_da_node_entry_t);
+ btree_s = &node2->btree[0];
+ btree_d = &node1->btree[INT_GET(node1->hdr.count, ARCH_CONVERT)];
+ memcpy(btree_d, btree_s, tmp);
+ INT_MOD(node1->hdr.count, ARCH_CONVERT, count);
+ xfs_da_log_buf(tp, blk1->bp,
+ XFS_DA_LOGRANGE(node1, btree_d, tmp));
+
+ /*
+ * Move elements in node2 down to fill the hole.
+ */
+ tmp = INT_GET(node2->hdr.count, ARCH_CONVERT) - count;
+ tmp *= (uint)sizeof(xfs_da_node_entry_t);
+ btree_s = &node2->btree[count];
+ btree_d = &node2->btree[0];
+ memmove(btree_d, btree_s, tmp);
+ INT_MOD(node2->hdr.count, ARCH_CONVERT, -(count));
+ }
+
+ /*
+ * Log header of node 1 and all current bits of node 2.
+ */
+ xfs_da_log_buf(tp, blk1->bp,
+ XFS_DA_LOGRANGE(node1, &node1->hdr, sizeof(node1->hdr)));
+ xfs_da_log_buf(tp, blk2->bp,
+ XFS_DA_LOGRANGE(node2, &node2->hdr,
+ sizeof(node2->hdr) +
+ sizeof(node2->btree[0]) * INT_GET(node2->hdr.count, ARCH_CONVERT)));
+
+ /*
+ * Record the last hashval from each block for upward propagation.
+ * (note: don't use the swapped node pointers)
+ */
+ node1 = blk1->bp->data;
+ node2 = blk2->bp->data;
+ blk1->hashval = INT_GET(node1->btree[ INT_GET(node1->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT);
+ blk2->hashval = INT_GET(node2->btree[ INT_GET(node2->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT);
+
+ /*
+ * Adjust the expected index for insertion.
+ */
+ if (blk1->index >= INT_GET(node1->hdr.count, ARCH_CONVERT)) {
+ blk2->index = blk1->index - INT_GET(node1->hdr.count, ARCH_CONVERT);
+ blk1->index = INT_GET(node1->hdr.count, ARCH_CONVERT) + 1; /* make it invalid */
+ }
+}
+
+/*
+ * Add a new entry to an intermediate node.
+ */
+STATIC void
+xfs_da_node_add(xfs_da_state_t *state, xfs_da_state_blk_t *oldblk,
+ xfs_da_state_blk_t *newblk)
+{
+ xfs_da_intnode_t *node;
+ xfs_da_node_entry_t *btree;
+ int tmp;
+ xfs_mount_t *mp;
+
+ node = oldblk->bp->data;
+ mp = state->mp;
+ ASSERT(INT_GET(node->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC);
+ ASSERT((oldblk->index >= 0) && (oldblk->index <= INT_GET(node->hdr.count, ARCH_CONVERT)));
+ ASSERT(newblk->blkno != 0);
+ if (state->args->whichfork == XFS_DATA_FORK && XFS_DIR_IS_V2(mp))
+ ASSERT(newblk->blkno >= mp->m_dirleafblk &&
+ newblk->blkno < mp->m_dirfreeblk);
+
+ /*
+ * We may need to make some room before we insert the new node.
+ */
+ tmp = 0;
+ btree = &node->btree[ oldblk->index ];
+ if (oldblk->index < INT_GET(node->hdr.count, ARCH_CONVERT)) {
+ tmp = (INT_GET(node->hdr.count, ARCH_CONVERT) - oldblk->index) * (uint)sizeof(*btree);
+ memmove(btree + 1, btree, tmp);
+ }
+ INT_SET(btree->hashval, ARCH_CONVERT, newblk->hashval);
+ INT_SET(btree->before, ARCH_CONVERT, newblk->blkno);
+ xfs_da_log_buf(state->args->trans, oldblk->bp,
+ XFS_DA_LOGRANGE(node, btree, tmp + sizeof(*btree)));
+ INT_MOD(node->hdr.count, ARCH_CONVERT, +1);
+ xfs_da_log_buf(state->args->trans, oldblk->bp,
+ XFS_DA_LOGRANGE(node, &node->hdr, sizeof(node->hdr)));
+
+ /*
+ * Copy the last hash value from the oldblk to propagate upwards.
+ */
+ oldblk->hashval = INT_GET(node->btree[ INT_GET(node->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT);
+}
+
+/*========================================================================
+ * Routines used for shrinking the Btree.
+ *========================================================================*/
+
+/*
+ * Deallocate an empty leaf node, remove it from its parent,
+ * possibly deallocating that block, etc...
+ */
+int
+xfs_da_join(xfs_da_state_t *state)
+{
+ xfs_da_state_blk_t *drop_blk, *save_blk;
+ int action, error;
+
+ action = 0;
+ drop_blk = &state->path.blk[ state->path.active-1 ];
+ save_blk = &state->altpath.blk[ state->path.active-1 ];
+ ASSERT(state->path.blk[0].magic == XFS_DA_NODE_MAGIC);
+ ASSERT(drop_blk->magic == XFS_ATTR_LEAF_MAGIC ||
+ drop_blk->magic == XFS_DIRX_LEAF_MAGIC(state->mp));
+
+ /*
+ * Walk back up the tree joining/deallocating as necessary.
+ * When we stop dropping blocks, break out.
+ */
+ for ( ; state->path.active >= 2; drop_blk--, save_blk--,
+ state->path.active--) {
+ /*
+ * See if we can combine the block with a neighbor.
+ * (action == 0) => no options, just leave
+ * (action == 1) => coalesce, then unlink
+ * (action == 2) => block empty, unlink it
+ */
+ switch (drop_blk->magic) {
+ case XFS_ATTR_LEAF_MAGIC:
+#ifndef __KERNEL__
+ error = ENOTTY;
+#else
+ error = xfs_attr_leaf_toosmall(state, &action);
+#endif
+ if (error)
+ return(error);
+ if (action == 0)
+ return(0);
+#ifdef __KERNEL__
+ xfs_attr_leaf_unbalance(state, drop_blk, save_blk);
+#endif
+ break;
+ case XFS_DIR_LEAF_MAGIC:
+ ASSERT(XFS_DIR_IS_V1(state->mp));
+ error = xfs_dir_leaf_toosmall(state, &action);
+ if (error)
+ return(error);
+ if (action == 0)
+ return(0);
+ xfs_dir_leaf_unbalance(state, drop_blk, save_blk);
+ break;
+ case XFS_DIR2_LEAFN_MAGIC:
+ ASSERT(XFS_DIR_IS_V2(state->mp));
+ error = xfs_dir2_leafn_toosmall(state, &action);
+ if (error)
+ return error;
+ if (action == 0)
+ return 0;
+ xfs_dir2_leafn_unbalance(state, drop_blk, save_blk);
+ break;
+ case XFS_DA_NODE_MAGIC:
+ /*
+ * Remove the offending node, fixup hashvals,
+ * check for a toosmall neighbor.
+ */
+ xfs_da_node_remove(state, drop_blk);
+ xfs_da_fixhashpath(state, &state->path);
+ error = xfs_da_node_toosmall(state, &action);
+ if (error)
+ return(error);
+ if (action == 0)
+ return 0;
+ xfs_da_node_unbalance(state, drop_blk, save_blk);
+ break;
+ }
+ xfs_da_fixhashpath(state, &state->altpath);
+ error = xfs_da_blk_unlink(state, drop_blk, save_blk);
+ xfs_da_state_kill_altpath(state);
+ if (error)
+ return(error);
+ error = xfs_da_shrink_inode(state->args, drop_blk->blkno,
+ drop_blk->bp);
+ drop_blk->bp = NULL;
+ if (error)
+ return(error);
+ }
+ /*
+ * We joined all the way to the top. If it turns out that
+ * we only have one entry in the root, make the child block
+ * the new root.
+ */
+ xfs_da_node_remove(state, drop_blk);
+ xfs_da_fixhashpath(state, &state->path);
+ error = xfs_da_root_join(state, &state->path.blk[0]);
+ return(error);
+}
+
+/*
+ * We have only one entry in the root. Copy the only remaining child of
+ * the old root to block 0 as the new root node.
+ */
+STATIC int
+xfs_da_root_join(xfs_da_state_t *state, xfs_da_state_blk_t *root_blk)
+{
+ xfs_da_intnode_t *oldroot;
+ /* REFERENCED */
+ xfs_da_blkinfo_t *blkinfo;
+ xfs_da_args_t *args;
+ xfs_dablk_t child;
+ xfs_dabuf_t *bp;
+ int error;
+
+ args = state->args;
+ ASSERT(args != NULL);
+ ASSERT(root_blk->magic == XFS_DA_NODE_MAGIC);
+ oldroot = root_blk->bp->data;
+ ASSERT(INT_GET(oldroot->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC);
+ ASSERT(INT_ISZERO(oldroot->hdr.info.forw, ARCH_CONVERT));
+ ASSERT(INT_ISZERO(oldroot->hdr.info.back, ARCH_CONVERT));
+
+ /*
+ * If the root has more than one child, then don't do anything.
+ */
+ if (INT_GET(oldroot->hdr.count, ARCH_CONVERT) > 1)
+ return(0);
+
+ /*
+ * Read in the (only) child block, then copy those bytes into
+ * the root block's buffer and free the original child block.
+ */
+ child = INT_GET(oldroot->btree[ 0 ].before, ARCH_CONVERT);
+ ASSERT(child != 0);
+ error = xfs_da_read_buf(args->trans, args->dp, child, -1, &bp,
+ args->whichfork);
+ if (error)
+ return(error);
+ ASSERT(bp != NULL);
+ blkinfo = bp->data;
+ if (INT_GET(oldroot->hdr.level, ARCH_CONVERT) == 1) {
+ ASSERT(INT_GET(blkinfo->magic, ARCH_CONVERT) == XFS_DIRX_LEAF_MAGIC(state->mp) ||
+ INT_GET(blkinfo->magic, ARCH_CONVERT) == XFS_ATTR_LEAF_MAGIC);
+ } else {
+ ASSERT(INT_GET(blkinfo->magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC);
+ }
+ ASSERT(INT_ISZERO(blkinfo->forw, ARCH_CONVERT));
+ ASSERT(INT_ISZERO(blkinfo->back, ARCH_CONVERT));
+ memcpy(root_blk->bp->data, bp->data, state->blocksize);
+ xfs_da_log_buf(args->trans, root_blk->bp, 0, state->blocksize - 1);
+ error = xfs_da_shrink_inode(args, child, bp);
+ return(error);
+}
+
+/*
+ * Check a node block and its neighbors to see if the block should be
+ * collapsed into one or the other neighbor. Always keep the block
+ * with the smaller block number.
+ * If the current block is over 50% full, don't try to join it, return 0.
+ * If the block is empty, fill in the state structure and return 2.
+ * If it can be collapsed, fill in the state structure and return 1.
+ * If nothing can be done, return 0.
+ */
+STATIC int
+xfs_da_node_toosmall(xfs_da_state_t *state, int *action)
+{
+ xfs_da_intnode_t *node;
+ xfs_da_state_blk_t *blk;
+ xfs_da_blkinfo_t *info;
+ int count, forward, error, retval, i;
+ xfs_dablk_t blkno;
+ xfs_dabuf_t *bp;
+
+ /*
+ * Check for the degenerate case of the block being over 50% full.
+ * If so, it's not worth even looking to see if we might be able
+ * to coalesce with a sibling.
+ */
+ blk = &state->path.blk[ state->path.active-1 ];
+ info = blk->bp->data;
+ ASSERT(INT_GET(info->magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC);
+ node = (xfs_da_intnode_t *)info;
+ count = INT_GET(node->hdr.count, ARCH_CONVERT);
+ if (count > (state->node_ents >> 1)) {
+ *action = 0; /* blk over 50%, don't try to join */
+ return(0); /* blk over 50%, don't try to join */
+ }
+
+ /*
+ * Check for the degenerate case of the block being empty.
+ * If the block is empty, we'll simply delete it, no need to
+ * coalesce it with a sibling block. We choose (aribtrarily)
+ * to merge with the forward block unless it is NULL.
+ */
+ if (count == 0) {
+ /*
+ * Make altpath point to the block we want to keep and
+ * path point to the block we want to drop (this one).
+ */
+ forward = (!INT_ISZERO(info->forw, ARCH_CONVERT));
+ memcpy(&state->altpath, &state->path, sizeof(state->path));
+ error = xfs_da_path_shift(state, &state->altpath, forward,
+ 0, &retval);
+ if (error)
+ return(error);
+ if (retval) {
+ *action = 0;
+ } else {
+ *action = 2;
+ }
+ return(0);
+ }
+
+ /*
+ * Examine each sibling block to see if we can coalesce with
+ * at least 25% free space to spare. We need to figure out
+ * whether to merge with the forward or the backward block.
+ * We prefer coalescing with the lower numbered sibling so as
+ * to shrink a directory over time.
+ */
+ /* start with smaller blk num */
+ forward = (INT_GET(info->forw, ARCH_CONVERT)
+ < INT_GET(info->back, ARCH_CONVERT));
+ for (i = 0; i < 2; forward = !forward, i++) {
+ if (forward)
+ blkno = INT_GET(info->forw, ARCH_CONVERT);
+ else
+ blkno = INT_GET(info->back, ARCH_CONVERT);
+ if (blkno == 0)
+ continue;
+ error = xfs_da_read_buf(state->args->trans, state->args->dp,
+ blkno, -1, &bp, state->args->whichfork);
+ if (error)
+ return(error);
+ ASSERT(bp != NULL);
+
+ node = (xfs_da_intnode_t *)info;
+ count = state->node_ents;
+ count -= state->node_ents >> 2;
+ count -= INT_GET(node->hdr.count, ARCH_CONVERT);
+ node = bp->data;
+ ASSERT(INT_GET(node->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC);
+ count -= INT_GET(node->hdr.count, ARCH_CONVERT);
+ xfs_da_brelse(state->args->trans, bp);
+ if (count >= 0)
+ break; /* fits with at least 25% to spare */
+ }
+ if (i >= 2) {
+ *action = 0;
+ return(0);
+ }
+
+ /*
+ * Make altpath point to the block we want to keep (the lower
+ * numbered block) and path point to the block we want to drop.
+ */
+ memcpy(&state->altpath, &state->path, sizeof(state->path));
+ if (blkno < blk->blkno) {
+ error = xfs_da_path_shift(state, &state->altpath, forward,
+ 0, &retval);
+ if (error) {
+ return(error);
+ }
+ if (retval) {
+ *action = 0;
+ return(0);
+ }
+ } else {
+ error = xfs_da_path_shift(state, &state->path, forward,
+ 0, &retval);
+ if (error) {
+ return(error);
+ }
+ if (retval) {
+ *action = 0;
+ return(0);
+ }
+ }
+ *action = 1;
+ return(0);
+}
+
+/*
+ * Walk back up the tree adjusting hash values as necessary,
+ * when we stop making changes, return.
+ */
+void
+xfs_da_fixhashpath(xfs_da_state_t *state, xfs_da_state_path_t *path)
+{
+ xfs_da_state_blk_t *blk;
+ xfs_da_intnode_t *node;
+ xfs_da_node_entry_t *btree;
+ xfs_dahash_t lasthash=0;
+ int level, count;
+
+ level = path->active-1;
+ blk = &path->blk[ level ];
+ switch (blk->magic) {
+#ifdef __KERNEL__
+ case XFS_ATTR_LEAF_MAGIC:
+ lasthash = xfs_attr_leaf_lasthash(blk->bp, &count);
+ if (count == 0)
+ return;
+ break;
+#endif
+ case XFS_DIR_LEAF_MAGIC:
+ ASSERT(XFS_DIR_IS_V1(state->mp));
+ lasthash = xfs_dir_leaf_lasthash(blk->bp, &count);
+ if (count == 0)
+ return;
+ break;
+ case XFS_DIR2_LEAFN_MAGIC:
+ ASSERT(XFS_DIR_IS_V2(state->mp));
+ lasthash = xfs_dir2_leafn_lasthash(blk->bp, &count);
+ if (count == 0)
+ return;
+ break;
+ case XFS_DA_NODE_MAGIC:
+ lasthash = xfs_da_node_lasthash(blk->bp, &count);
+ if (count == 0)
+ return;
+ break;
+ }
+ for (blk--, level--; level >= 0; blk--, level--) {
+ node = blk->bp->data;
+ ASSERT(INT_GET(node->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC);
+ btree = &node->btree[ blk->index ];
+ if (INT_GET(btree->hashval, ARCH_CONVERT) == lasthash)
+ break;
+ blk->hashval = lasthash;
+ INT_SET(btree->hashval, ARCH_CONVERT, lasthash);
+ xfs_da_log_buf(state->args->trans, blk->bp,
+ XFS_DA_LOGRANGE(node, btree, sizeof(*btree)));
+
+ lasthash = INT_GET(node->btree[ INT_GET(node->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT);
+ }
+}
+
+/*
+ * Remove an entry from an intermediate node.
+ */
+STATIC void
+xfs_da_node_remove(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk)
+{
+ xfs_da_intnode_t *node;
+ xfs_da_node_entry_t *btree;
+ int tmp;
+
+ node = drop_blk->bp->data;
+ ASSERT(drop_blk->index < INT_GET(node->hdr.count, ARCH_CONVERT));
+ ASSERT(drop_blk->index >= 0);
+
+ /*
+ * Copy over the offending entry, or just zero it out.
+ */
+ btree = &node->btree[drop_blk->index];
+ if (drop_blk->index < (INT_GET(node->hdr.count, ARCH_CONVERT)-1)) {
+ tmp = INT_GET(node->hdr.count, ARCH_CONVERT) - drop_blk->index - 1;
+ tmp *= (uint)sizeof(xfs_da_node_entry_t);
+ memmove(btree, btree + 1, tmp);
+ xfs_da_log_buf(state->args->trans, drop_blk->bp,
+ XFS_DA_LOGRANGE(node, btree, tmp));
+ btree = &node->btree[ INT_GET(node->hdr.count, ARCH_CONVERT)-1 ];
+ }
+ memset((char *)btree, 0, sizeof(xfs_da_node_entry_t));
+ xfs_da_log_buf(state->args->trans, drop_blk->bp,
+ XFS_DA_LOGRANGE(node, btree, sizeof(*btree)));
+ INT_MOD(node->hdr.count, ARCH_CONVERT, -1);
+ xfs_da_log_buf(state->args->trans, drop_blk->bp,
+ XFS_DA_LOGRANGE(node, &node->hdr, sizeof(node->hdr)));
+
+ /*
+ * Copy the last hash value from the block to propagate upwards.
+ */
+ btree--;
+ drop_blk->hashval = INT_GET(btree->hashval, ARCH_CONVERT);
+}
+
+/*
+ * Unbalance the btree elements between two intermediate nodes,
+ * move all Btree elements from one node into another.
+ */
+STATIC void
+xfs_da_node_unbalance(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk,
+ xfs_da_state_blk_t *save_blk)
+{
+ xfs_da_intnode_t *drop_node, *save_node;
+ xfs_da_node_entry_t *btree;
+ int tmp;
+ xfs_trans_t *tp;
+
+ drop_node = drop_blk->bp->data;
+ save_node = save_blk->bp->data;
+ ASSERT(INT_GET(drop_node->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC);
+ ASSERT(INT_GET(save_node->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC);
+ tp = state->args->trans;
+
+ /*
+ * If the dying block has lower hashvals, then move all the
+ * elements in the remaining block up to make a hole.
+ */
+ if ((INT_GET(drop_node->btree[ 0 ].hashval, ARCH_CONVERT) < INT_GET(save_node->btree[ 0 ].hashval, ARCH_CONVERT)) ||
+ (INT_GET(drop_node->btree[ INT_GET(drop_node->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT) <
+ INT_GET(save_node->btree[ INT_GET(save_node->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT)))
+ {
+ btree = &save_node->btree[ INT_GET(drop_node->hdr.count, ARCH_CONVERT) ];
+ tmp = INT_GET(save_node->hdr.count, ARCH_CONVERT) * (uint)sizeof(xfs_da_node_entry_t);
+ memmove(btree, &save_node->btree[0], tmp);
+ btree = &save_node->btree[0];
+ xfs_da_log_buf(tp, save_blk->bp,
+ XFS_DA_LOGRANGE(save_node, btree,
+ (INT_GET(save_node->hdr.count, ARCH_CONVERT) + INT_GET(drop_node->hdr.count, ARCH_CONVERT)) *
+ sizeof(xfs_da_node_entry_t)));
+ } else {
+ btree = &save_node->btree[ INT_GET(save_node->hdr.count, ARCH_CONVERT) ];
+ xfs_da_log_buf(tp, save_blk->bp,
+ XFS_DA_LOGRANGE(save_node, btree,
+ INT_GET(drop_node->hdr.count, ARCH_CONVERT) *
+ sizeof(xfs_da_node_entry_t)));
+ }
+
+ /*
+ * Move all the B-tree elements from drop_blk to save_blk.
+ */
+ tmp = INT_GET(drop_node->hdr.count, ARCH_CONVERT) * (uint)sizeof(xfs_da_node_entry_t);
+ memcpy(btree, &drop_node->btree[0], tmp);
+ INT_MOD(save_node->hdr.count, ARCH_CONVERT, INT_GET(drop_node->hdr.count, ARCH_CONVERT));
+
+ xfs_da_log_buf(tp, save_blk->bp,
+ XFS_DA_LOGRANGE(save_node, &save_node->hdr,
+ sizeof(save_node->hdr)));
+
+ /*
+ * Save the last hashval in the remaining block for upward propagation.
+ */
+ save_blk->hashval = INT_GET(save_node->btree[ INT_GET(save_node->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT);
+}
+
+/*========================================================================
+ * Routines used for finding things in the Btree.
+ *========================================================================*/
+
+/*
+ * Walk down the Btree looking for a particular filename, filling
+ * in the state structure as we go.
+ *
+ * We will set the state structure to point to each of the elements
+ * in each of the nodes where either the hashval is or should be.
+ *
+ * We support duplicate hashval's so for each entry in the current
+ * node that could contain the desired hashval, descend. This is a
+ * pruned depth-first tree search.
+ */
+int /* error */
+xfs_da_node_lookup_int(xfs_da_state_t *state, int *result)
+{
+ xfs_da_state_blk_t *blk;
+ xfs_da_blkinfo_t *curr;
+ xfs_da_intnode_t *node;
+ xfs_da_node_entry_t *btree;
+ xfs_dablk_t blkno;
+ int probe, span, max, error, retval;
+ xfs_dahash_t hashval;
+ xfs_da_args_t *args;
+
+ args = state->args;
+
+ /*
+ * Descend thru the B-tree searching each level for the right
+ * node to use, until the right hashval is found.
+ */
+ if (args->whichfork == XFS_DATA_FORK && XFS_DIR_IS_V2(state->mp))
+ blkno = state->mp->m_dirleafblk;
+ else
+ blkno = 0;
+ for (blk = &state->path.blk[0], state->path.active = 1;
+ state->path.active <= XFS_DA_NODE_MAXDEPTH;
+ blk++, state->path.active++) {
+ /*
+ * Read the next node down in the tree.
+ */
+ blk->blkno = blkno;
+ error = xfs_da_read_buf(args->trans, args->dp, blkno,
+ -1, &blk->bp, args->whichfork);
+ if (error) {
+ blk->blkno = 0;
+ state->path.active--;
+ return(error);
+ }
+ curr = blk->bp->data;
+ ASSERT(INT_GET(curr->magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC ||
+ INT_GET(curr->magic, ARCH_CONVERT) == XFS_DIRX_LEAF_MAGIC(state->mp) ||
+ INT_GET(curr->magic, ARCH_CONVERT) == XFS_ATTR_LEAF_MAGIC);
+
+ /*
+ * Search an intermediate node for a match.
+ */
+ blk->magic = INT_GET(curr->magic, ARCH_CONVERT);
+ if (INT_GET(curr->magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC) {
+ node = blk->bp->data;
+ blk->hashval = INT_GET(node->btree[ INT_GET(node->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT);
+
+ /*
+ * Binary search. (note: small blocks will skip loop)
+ */
+ max = INT_GET(node->hdr.count, ARCH_CONVERT);
+ probe = span = max / 2;
+ hashval = args->hashval;
+ for (btree = &node->btree[probe]; span > 4;
+ btree = &node->btree[probe]) {
+ span /= 2;
+ if (INT_GET(btree->hashval, ARCH_CONVERT) < hashval)
+ probe += span;
+ else if (INT_GET(btree->hashval, ARCH_CONVERT) > hashval)
+ probe -= span;
+ else
+ break;
+ }
+ ASSERT((probe >= 0) && (probe < max));
+ ASSERT((span <= 4) || (INT_GET(btree->hashval, ARCH_CONVERT) == hashval));
+
+ /*
+ * Since we may have duplicate hashval's, find the first
+ * matching hashval in the node.
+ */
+ while ((probe > 0) && (INT_GET(btree->hashval, ARCH_CONVERT) >= hashval)) {
+ btree--;
+ probe--;
+ }
+ while ((probe < max) && (INT_GET(btree->hashval, ARCH_CONVERT) < hashval)) {
+ btree++;
+ probe++;
+ }
+
+ /*
+ * Pick the right block to descend on.
+ */
+ if (probe == max) {
+ blk->index = max-1;
+ blkno = INT_GET(node->btree[ max-1 ].before, ARCH_CONVERT);
+ } else {
+ blk->index = probe;
+ blkno = INT_GET(btree->before, ARCH_CONVERT);
+ }
+ }
+#ifdef __KERNEL__
+ else if (INT_GET(curr->magic, ARCH_CONVERT) == XFS_ATTR_LEAF_MAGIC) {
+ blk->hashval = xfs_attr_leaf_lasthash(blk->bp, NULL);
+ break;
+ }
+#endif
+ else if (INT_GET(curr->magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC) {
+ blk->hashval = xfs_dir_leaf_lasthash(blk->bp, NULL);
+ break;
+ }
+ else if (INT_GET(curr->magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC) {
+ blk->hashval = xfs_dir2_leafn_lasthash(blk->bp, NULL);
+ break;
+ }
+ }
+
+ /*
+ * A leaf block that ends in the hashval that we are interested in
+ * (final hashval == search hashval) means that the next block may
+ * contain more entries with the same hashval, shift upward to the
+ * next leaf and keep searching.
+ */
+ for (;;) {
+ if (blk->magic == XFS_DIR_LEAF_MAGIC) {
+ ASSERT(XFS_DIR_IS_V1(state->mp));
+ retval = xfs_dir_leaf_lookup_int(blk->bp, args,
+ &blk->index);
+ } else if (blk->magic == XFS_DIR2_LEAFN_MAGIC) {
+ ASSERT(XFS_DIR_IS_V2(state->mp));
+ retval = xfs_dir2_leafn_lookup_int(blk->bp, args,
+ &blk->index, state);
+ }
+#ifdef __KERNEL__
+ else if (blk->magic == XFS_ATTR_LEAF_MAGIC) {
+ retval = xfs_attr_leaf_lookup_int(blk->bp, args);
+ blk->index = args->index;
+ args->blkno = blk->blkno;
+ }
+#endif
+ if (((retval == ENOENT) || (retval == ENOATTR)) &&
+ (blk->hashval == args->hashval)) {
+ error = xfs_da_path_shift(state, &state->path, 1, 1,
+ &retval);
+ if (error)
+ return(error);
+ if (retval == 0) {
+ continue;
+ }
+#ifdef __KERNEL__
+ else if (blk->magic == XFS_ATTR_LEAF_MAGIC) {
+ /* path_shift() gives ENOENT */
+ retval = XFS_ERROR(ENOATTR);
+ }
+#endif
+ }
+ break;
+ }
+ *result = retval;
+ return(0);
+}
+
+/*========================================================================
+ * Utility routines.
+ *========================================================================*/
+
+/*
+ * Link a new block into a doubly linked list of blocks (of whatever type).
+ */
+int /* error */
+xfs_da_blk_link(xfs_da_state_t *state, xfs_da_state_blk_t *old_blk,
+ xfs_da_state_blk_t *new_blk)
+{
+ xfs_da_blkinfo_t *old_info, *new_info, *tmp_info;
+ xfs_da_args_t *args;
+ int before=0, error;
+ xfs_dabuf_t *bp;
+
+ /*
+ * Set up environment.
+ */
+ args = state->args;
+ ASSERT(args != NULL);
+ old_info = old_blk->bp->data;
+ new_info = new_blk->bp->data;
+ ASSERT(old_blk->magic == XFS_DA_NODE_MAGIC ||
+ old_blk->magic == XFS_DIRX_LEAF_MAGIC(state->mp) ||
+ old_blk->magic == XFS_ATTR_LEAF_MAGIC);
+ ASSERT(old_blk->magic == INT_GET(old_info->magic, ARCH_CONVERT));
+ ASSERT(new_blk->magic == INT_GET(new_info->magic, ARCH_CONVERT));
+ ASSERT(old_blk->magic == new_blk->magic);
+
+ switch (old_blk->magic) {
+#ifdef __KERNEL__
+ case XFS_ATTR_LEAF_MAGIC:
+ before = xfs_attr_leaf_order(old_blk->bp, new_blk->bp);
+ break;
+#endif
+ case XFS_DIR_LEAF_MAGIC:
+ ASSERT(XFS_DIR_IS_V1(state->mp));
+ before = xfs_dir_leaf_order(old_blk->bp, new_blk->bp);
+ break;
+ case XFS_DIR2_LEAFN_MAGIC:
+ ASSERT(XFS_DIR_IS_V2(state->mp));
+ before = xfs_dir2_leafn_order(old_blk->bp, new_blk->bp);
+ break;
+ case XFS_DA_NODE_MAGIC:
+ before = xfs_da_node_order(old_blk->bp, new_blk->bp);
+ break;
+ }
+
+ /*
+ * Link blocks in appropriate order.
+ */
+ if (before) {
+ /*
+ * Link new block in before existing block.
+ */
+ INT_SET(new_info->forw, ARCH_CONVERT, old_blk->blkno);
+ new_info->back = old_info->back; /* INT_: direct copy */
+ if (INT_GET(old_info->back, ARCH_CONVERT)) {
+ error = xfs_da_read_buf(args->trans, args->dp,
+ INT_GET(old_info->back,
+ ARCH_CONVERT), -1, &bp,
+ args->whichfork);
+ if (error)
+ return(error);
+ ASSERT(bp != NULL);
+ tmp_info = bp->data;
+ ASSERT(INT_GET(tmp_info->magic, ARCH_CONVERT) == INT_GET(old_info->magic, ARCH_CONVERT));
+ ASSERT(INT_GET(tmp_info->forw, ARCH_CONVERT) == old_blk->blkno);
+ INT_SET(tmp_info->forw, ARCH_CONVERT, new_blk->blkno);
+ xfs_da_log_buf(args->trans, bp, 0, sizeof(*tmp_info)-1);
+ xfs_da_buf_done(bp);
+ }
+ INT_SET(old_info->back, ARCH_CONVERT, new_blk->blkno);
+ } else {
+ /*
+ * Link new block in after existing block.
+ */
+ new_info->forw = old_info->forw; /* INT_: direct copy */
+ INT_SET(new_info->back, ARCH_CONVERT, old_blk->blkno);
+ if (INT_GET(old_info->forw, ARCH_CONVERT)) {
+ error = xfs_da_read_buf(args->trans, args->dp,
+ INT_GET(old_info->forw, ARCH_CONVERT), -1, &bp,
+ args->whichfork);
+ if (error)
+ return(error);
+ ASSERT(bp != NULL);
+ tmp_info = bp->data;
+ ASSERT(INT_GET(tmp_info->magic, ARCH_CONVERT)
+ == INT_GET(old_info->magic, ARCH_CONVERT));
+ ASSERT(INT_GET(tmp_info->back, ARCH_CONVERT)
+ == old_blk->blkno);
+ INT_SET(tmp_info->back, ARCH_CONVERT, new_blk->blkno);
+ xfs_da_log_buf(args->trans, bp, 0, sizeof(*tmp_info)-1);
+ xfs_da_buf_done(bp);
+ }
+ INT_SET(old_info->forw, ARCH_CONVERT, new_blk->blkno);
+ }
+
+ xfs_da_log_buf(args->trans, old_blk->bp, 0, sizeof(*tmp_info) - 1);
+ xfs_da_log_buf(args->trans, new_blk->bp, 0, sizeof(*tmp_info) - 1);
+ return(0);
+}
+
+/*
+ * Compare two intermediate nodes for "order".
+ */
+STATIC int
+xfs_da_node_order(xfs_dabuf_t *node1_bp, xfs_dabuf_t *node2_bp)
+{
+ xfs_da_intnode_t *node1, *node2;
+
+ node1 = node1_bp->data;
+ node2 = node2_bp->data;
+ ASSERT((INT_GET(node1->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC) &&
+ (INT_GET(node2->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC));
+ if ((INT_GET(node1->hdr.count, ARCH_CONVERT) > 0) && (INT_GET(node2->hdr.count, ARCH_CONVERT) > 0) &&
+ ((INT_GET(node2->btree[ 0 ].hashval, ARCH_CONVERT) <
+ INT_GET(node1->btree[ 0 ].hashval, ARCH_CONVERT)) ||
+ (INT_GET(node2->btree[ INT_GET(node2->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT) <
+ INT_GET(node1->btree[ INT_GET(node1->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT)))) {
+ return(1);
+ }
+ return(0);
+}
+
+/*
+ * Pick up the last hashvalue from an intermediate node.
+ */
+STATIC uint
+xfs_da_node_lasthash(xfs_dabuf_t *bp, int *count)
+{
+ xfs_da_intnode_t *node;
+
+ node = bp->data;
+ ASSERT(INT_GET(node->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC);
+ if (count)
+ *count = INT_GET(node->hdr.count, ARCH_CONVERT);
+ if (INT_ISZERO(node->hdr.count, ARCH_CONVERT))
+ return(0);
+ return(INT_GET(node->btree[ INT_GET(node->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT));
+}
+
+/*
+ * Unlink a block from a doubly linked list of blocks.
+ */
+int /* error */
+xfs_da_blk_unlink(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk,
+ xfs_da_state_blk_t *save_blk)
+{
+ xfs_da_blkinfo_t *drop_info, *save_info, *tmp_info;
+ xfs_da_args_t *args;
+ xfs_dabuf_t *bp;
+ int error;
+
+ /*
+ * Set up environment.
+ */
+ args = state->args;
+ ASSERT(args != NULL);
+ save_info = save_blk->bp->data;
+ drop_info = drop_blk->bp->data;
+ ASSERT(save_blk->magic == XFS_DA_NODE_MAGIC ||
+ save_blk->magic == XFS_DIRX_LEAF_MAGIC(state->mp) ||
+ save_blk->magic == XFS_ATTR_LEAF_MAGIC);
+ ASSERT(save_blk->magic == INT_GET(save_info->magic, ARCH_CONVERT));
+ ASSERT(drop_blk->magic == INT_GET(drop_info->magic, ARCH_CONVERT));
+ ASSERT(save_blk->magic == drop_blk->magic);
+ ASSERT((INT_GET(save_info->forw, ARCH_CONVERT) == drop_blk->blkno) ||
+ (INT_GET(save_info->back, ARCH_CONVERT) == drop_blk->blkno));
+ ASSERT((INT_GET(drop_info->forw, ARCH_CONVERT) == save_blk->blkno) ||
+ (INT_GET(drop_info->back, ARCH_CONVERT) == save_blk->blkno));
+
+ /*
+ * Unlink the leaf block from the doubly linked chain of leaves.
+ */
+ if (INT_GET(save_info->back, ARCH_CONVERT) == drop_blk->blkno) {
+ save_info->back = drop_info->back; /* INT_: direct copy */
+ if (INT_GET(drop_info->back, ARCH_CONVERT)) {
+ error = xfs_da_read_buf(args->trans, args->dp,
+ INT_GET(drop_info->back,
+ ARCH_CONVERT), -1, &bp,
+ args->whichfork);
+ if (error)
+ return(error);
+ ASSERT(bp != NULL);
+ tmp_info = bp->data;
+ ASSERT(INT_GET(tmp_info->magic, ARCH_CONVERT) == INT_GET(save_info->magic, ARCH_CONVERT));
+ ASSERT(INT_GET(tmp_info->forw, ARCH_CONVERT) == drop_blk->blkno);
+ INT_SET(tmp_info->forw, ARCH_CONVERT, save_blk->blkno);
+ xfs_da_log_buf(args->trans, bp, 0,
+ sizeof(*tmp_info) - 1);
+ xfs_da_buf_done(bp);
+ }
+ } else {
+ save_info->forw = drop_info->forw; /* INT_: direct copy */
+ if (INT_GET(drop_info->forw, ARCH_CONVERT)) {
+ error = xfs_da_read_buf(args->trans, args->dp,
+ INT_GET(drop_info->forw, ARCH_CONVERT), -1, &bp,
+ args->whichfork);
+ if (error)
+ return(error);
+ ASSERT(bp != NULL);
+ tmp_info = bp->data;
+ ASSERT(INT_GET(tmp_info->magic, ARCH_CONVERT)
+ == INT_GET(save_info->magic, ARCH_CONVERT));
+ ASSERT(INT_GET(tmp_info->back, ARCH_CONVERT)
+ == drop_blk->blkno);
+ INT_SET(tmp_info->back, ARCH_CONVERT, save_blk->blkno);
+ xfs_da_log_buf(args->trans, bp, 0,
+ sizeof(*tmp_info) - 1);
+ xfs_da_buf_done(bp);
+ }
+ }
+
+ xfs_da_log_buf(args->trans, save_blk->bp, 0, sizeof(*save_info) - 1);
+ return(0);
+}
+
+/*
+ * Move a path "forward" or "!forward" one block at the current level.
+ *
+ * This routine will adjust a "path" to point to the next block
+ * "forward" (higher hashvalues) or "!forward" (lower hashvals) in the
+ * Btree, including updating pointers to the intermediate nodes between
+ * the new bottom and the root.
+ */
+int /* error */
+xfs_da_path_shift(xfs_da_state_t *state, xfs_da_state_path_t *path,
+ int forward, int release, int *result)
+{
+ xfs_da_state_blk_t *blk;
+ xfs_da_blkinfo_t *info;
+ xfs_da_intnode_t *node;
+ xfs_da_args_t *args;
+ xfs_dablk_t blkno=0;
+ int level, error;
+
+ /*
+ * Roll up the Btree looking for the first block where our
+ * current index is not at the edge of the block. Note that
+ * we skip the bottom layer because we want the sibling block.
+ */
+ args = state->args;
+ ASSERT(args != NULL);
+ ASSERT(path != NULL);
+ ASSERT((path->active > 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
+ level = (path->active-1) - 1; /* skip bottom layer in path */
+ for (blk = &path->blk[level]; level >= 0; blk--, level--) {
+ ASSERT(blk->bp != NULL);
+ node = blk->bp->data;
+ ASSERT(INT_GET(node->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC);
+ if (forward && (blk->index < INT_GET(node->hdr.count, ARCH_CONVERT)-1)) {
+ blk->index++;
+ blkno = INT_GET(node->btree[ blk->index ].before, ARCH_CONVERT);
+ break;
+ } else if (!forward && (blk->index > 0)) {
+ blk->index--;
+ blkno = INT_GET(node->btree[ blk->index ].before, ARCH_CONVERT);
+ break;
+ }
+ }
+ if (level < 0) {
+ *result = XFS_ERROR(ENOENT); /* we're out of our tree */
+ ASSERT(args->oknoent);
+ return(0);
+ }
+
+ /*
+ * Roll down the edge of the subtree until we reach the
+ * same depth we were at originally.
+ */
+ for (blk++, level++; level < path->active; blk++, level++) {
+ /*
+ * Release the old block.
+ * (if it's dirty, trans won't actually let go)
+ */
+ if (release)
+ xfs_da_brelse(args->trans, blk->bp);
+
+ /*
+ * Read the next child block.
+ */
+ blk->blkno = blkno;
+ error = xfs_da_read_buf(args->trans, args->dp, blkno, -1,
+ &blk->bp, args->whichfork);
+ if (error)
+ return(error);
+ ASSERT(blk->bp != NULL);
+ info = blk->bp->data;
+ ASSERT(INT_GET(info->magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC ||
+ INT_GET(info->magic, ARCH_CONVERT) == XFS_DIRX_LEAF_MAGIC(state->mp) ||
+ INT_GET(info->magic, ARCH_CONVERT) == XFS_ATTR_LEAF_MAGIC);
+ blk->magic = INT_GET(info->magic, ARCH_CONVERT);
+ if (INT_GET(info->magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC) {
+ node = (xfs_da_intnode_t *)info;
+ blk->hashval = INT_GET(node->btree[ INT_GET(node->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT);
+ if (forward)
+ blk->index = 0;
+ else
+ blk->index = INT_GET(node->hdr.count, ARCH_CONVERT)-1;
+ blkno = INT_GET(node->btree[ blk->index ].before, ARCH_CONVERT);
+ } else {
+ ASSERT(level == path->active-1);
+ blk->index = 0;
+ switch(blk->magic) {
+#ifdef __KERNEL__
+ case XFS_ATTR_LEAF_MAGIC:
+ blk->hashval = xfs_attr_leaf_lasthash(blk->bp,
+ NULL);
+ break;
+#endif
+ case XFS_DIR_LEAF_MAGIC:
+ ASSERT(XFS_DIR_IS_V1(state->mp));
+ blk->hashval = xfs_dir_leaf_lasthash(blk->bp,
+ NULL);
+ break;
+ case XFS_DIR2_LEAFN_MAGIC:
+ ASSERT(XFS_DIR_IS_V2(state->mp));
+ blk->hashval = xfs_dir2_leafn_lasthash(blk->bp,
+ NULL);
+ break;
+ default:
+ ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC ||
+ blk->magic ==
+ XFS_DIRX_LEAF_MAGIC(state->mp));
+ break;
+ }
+ }
+ }
+ *result = 0;
+ return(0);
+}
+
+
+/*========================================================================
+ * Utility routines.
+ *========================================================================*/
+
+/*
+ * Implement a simple hash on a character string.
+ * Rotate the hash value by 7 bits, then XOR each character in.
+ * This is implemented with some source-level loop unrolling.
+ */
+xfs_dahash_t
+xfs_da_hashname(uchar_t *name, int namelen)
+{
+ xfs_dahash_t hash;
+
+#define ROTL(x,y) (((x) << (y)) | ((x) >> (32 - (y))))
+#ifdef SLOWVERSION
+ /*
+ * This is the old one-byte-at-a-time version.
+ */
+ for (hash = 0; namelen > 0; namelen--) {
+ hash = *name++ ^ ROTL(hash, 7);
+ }
+ return(hash);
+#else
+ /*
+ * Do four characters at a time as long as we can.
+ */
+ for (hash = 0; namelen >= 4; namelen -= 4, name += 4) {
+ hash = (name[0] << 21) ^ (name[1] << 14) ^ (name[2] << 7) ^
+ (name[3] << 0) ^ ROTL(hash, 7 * 4);
+ }
+ /*
+ * Now do the rest of the characters.
+ */
+ switch (namelen) {
+ case 3:
+ return (name[0] << 14) ^ (name[1] << 7) ^ (name[2] << 0) ^
+ ROTL(hash, 7 * 3);
+ case 2:
+ return (name[0] << 7) ^ (name[1] << 0) ^ ROTL(hash, 7 * 2);
+ case 1:
+ return (name[0] << 0) ^ ROTL(hash, 7 * 1);
+ case 0:
+ return hash;
+ }
+ /* NOTREACHED */
+#endif
+#undef ROTL
+ return 0; /* keep gcc happy */
+}
+
+/*
+ * Add a block to the btree ahead of the file.
+ * Return the new block number to the caller.
+ */
+int
+xfs_da_grow_inode(xfs_da_args_t *args, xfs_dablk_t *new_blkno)
+{
+ xfs_fileoff_t bno, b;
+ xfs_bmbt_irec_t map;
+ xfs_bmbt_irec_t *mapp;
+ xfs_inode_t *dp;
+ int nmap, error, w, count, c, got, i, mapi;
+ xfs_fsize_t size;
+ xfs_trans_t *tp;
+ xfs_mount_t *mp;
+
+ dp = args->dp;
+ mp = dp->i_mount;
+ w = args->whichfork;
+ tp = args->trans;
+ /*
+ * For new directories adjust the file offset and block count.
+ */
+ if (w == XFS_DATA_FORK && XFS_DIR_IS_V2(mp)) {
+ bno = mp->m_dirleafblk;
+ count = mp->m_dirblkfsbs;
+ } else {
+ bno = 0;
+ count = 1;
+ }
+ /*
+ * Find a spot in the file space to put the new block.
+ */
+ if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, w))) {
+ return error;
+ }
+ if (w == XFS_DATA_FORK && XFS_DIR_IS_V2(mp))
+ ASSERT(bno >= mp->m_dirleafblk && bno < mp->m_dirfreeblk);
+ /*
+ * Try mapping it in one filesystem block.
+ */
+ nmap = 1;
+ ASSERT(args->firstblock != NULL);
+ if ((error = xfs_bmapi(tp, dp, bno, count,
+ XFS_BMAPI_AFLAG(w)|XFS_BMAPI_WRITE|XFS_BMAPI_METADATA|
+ XFS_BMAPI_CONTIG,
+ args->firstblock, args->total, &map, &nmap,
+ args->flist))) {
+ return error;
+ }
+ ASSERT(nmap <= 1);
+ if (nmap == 1) {
+ mapp = ↦
+ mapi = 1;
+ }
+ /*
+ * If we didn't get it and the block might work if fragmented,
+ * try without the CONTIG flag. Loop until we get it all.
+ */
+ else if (nmap == 0 && count > 1) {
+ mapp = kmem_alloc(sizeof(*mapp) * count, KM_SLEEP);
+ for (b = bno, mapi = 0; b < bno + count; ) {
+ nmap = MIN(XFS_BMAP_MAX_NMAP, count);
+ c = (int)(bno + count - b);
+ if ((error = xfs_bmapi(tp, dp, b, c,
+ XFS_BMAPI_AFLAG(w)|XFS_BMAPI_WRITE|
+ XFS_BMAPI_METADATA,
+ args->firstblock, args->total,
+ &mapp[mapi], &nmap, args->flist))) {
+ kmem_free(mapp, sizeof(*mapp) * count);
+ return error;
+ }
+ if (nmap < 1)
+ break;
+ mapi += nmap;
+ b = mapp[mapi - 1].br_startoff +
+ mapp[mapi - 1].br_blockcount;
+ }
+ } else {
+ mapi = 0;
+ mapp = NULL;
+ }
+ /*
+ * Count the blocks we got, make sure it matches the total.
+ */
+ for (i = 0, got = 0; i < mapi; i++)
+ got += mapp[i].br_blockcount;
+ 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);
+ }
+ if (mapp != &map)
+ kmem_free(mapp, sizeof(*mapp) * count);
+ *new_blkno = (xfs_dablk_t)bno;
+ /*
+ * For version 1 directories, adjust the file size if it changed.
+ */
+ if (w == XFS_DATA_FORK && XFS_DIR_IS_V1(mp)) {
+ ASSERT(mapi == 1);
+ if ((error = xfs_bmap_last_offset(tp, dp, &bno, w)))
+ return error;
+ size = XFS_FSB_TO_B(mp, bno);
+ if (size != dp->i_d.di_size) {
+ dp->i_d.di_size = size;
+ xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
+ }
+ }
+ return 0;
+}
+
+/*
+ * Ick. We need to always be able to remove a btree block, even
+ * if there's no space reservation because the filesystem is full.
+ * This is called if xfs_bunmapi on a btree block fails due to ENOSPC.
+ * It swaps the target block with the last block in the file. The
+ * last block in the file can always be removed since it can't cause
+ * a bmap btree split to do that.
+ */
+STATIC int
+xfs_da_swap_lastblock(xfs_da_args_t *args, xfs_dablk_t *dead_blknop,
+ xfs_dabuf_t **dead_bufp)
+{
+ xfs_dablk_t dead_blkno, last_blkno, sib_blkno, par_blkno;
+ xfs_dabuf_t *dead_buf, *last_buf, *sib_buf, *par_buf;
+ xfs_fileoff_t lastoff;
+ xfs_inode_t *ip;
+ xfs_trans_t *tp;
+ xfs_mount_t *mp;
+ int error, w, entno, level, dead_level;
+ xfs_da_blkinfo_t *dead_info, *sib_info;
+ xfs_da_intnode_t *par_node, *dead_node;
+ xfs_dir_leafblock_t *dead_leaf;
+ xfs_dir2_leaf_t *dead_leaf2;
+ xfs_dahash_t dead_hash;
+
+ dead_buf = *dead_bufp;
+ dead_blkno = *dead_blknop;
+ tp = args->trans;
+ ip = args->dp;
+ w = args->whichfork;
+ ASSERT(w == XFS_DATA_FORK);
+ mp = ip->i_mount;
+ if (XFS_DIR_IS_V2(mp)) {
+ lastoff = mp->m_dirfreeblk;
+ error = xfs_bmap_last_before(tp, ip, &lastoff, w);
+ } else
+ error = xfs_bmap_last_offset(tp, ip, &lastoff, w);
+ if (error)
+ return error;
+ if (unlikely(lastoff == 0)) {
+ XFS_ERROR_REPORT("xfs_da_swap_lastblock(1)", XFS_ERRLEVEL_LOW,
+ mp);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+ /*
+ * Read the last block in the btree space.
+ */
+ last_blkno = (xfs_dablk_t)lastoff - mp->m_dirblkfsbs;
+ if ((error = xfs_da_read_buf(tp, ip, last_blkno, -1, &last_buf, w)))
+ return error;
+ /*
+ * Copy the last block into the dead buffer and log it.
+ */
+ memcpy(dead_buf->data, last_buf->data, mp->m_dirblksize);
+ xfs_da_log_buf(tp, dead_buf, 0, mp->m_dirblksize - 1);
+ dead_info = dead_buf->data;
+ /*
+ * Get values from the moved block.
+ */
+ if (INT_GET(dead_info->magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC) {
+ ASSERT(XFS_DIR_IS_V1(mp));
+ dead_leaf = (xfs_dir_leafblock_t *)dead_info;
+ dead_level = 0;
+ dead_hash =
+ INT_GET(dead_leaf->entries[INT_GET(dead_leaf->hdr.count, ARCH_CONVERT) - 1].hashval, ARCH_CONVERT);
+ } else if (INT_GET(dead_info->magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC) {
+ ASSERT(XFS_DIR_IS_V2(mp));
+ dead_leaf2 = (xfs_dir2_leaf_t *)dead_info;
+ dead_level = 0;
+ dead_hash = INT_GET(dead_leaf2->ents[INT_GET(dead_leaf2->hdr.count, ARCH_CONVERT) - 1].hashval, ARCH_CONVERT);
+ } else {
+ ASSERT(INT_GET(dead_info->magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC);
+ dead_node = (xfs_da_intnode_t *)dead_info;
+ dead_level = INT_GET(dead_node->hdr.level, ARCH_CONVERT);
+ dead_hash = INT_GET(dead_node->btree[INT_GET(dead_node->hdr.count, ARCH_CONVERT) - 1].hashval, ARCH_CONVERT);
+ }
+ sib_buf = par_buf = NULL;
+ /*
+ * If the moved block has a left sibling, fix up the pointers.
+ */
+ if ((sib_blkno = INT_GET(dead_info->back, ARCH_CONVERT))) {
+ if ((error = xfs_da_read_buf(tp, ip, sib_blkno, -1, &sib_buf, w)))
+ goto done;
+ sib_info = sib_buf->data;
+ if (unlikely(
+ INT_GET(sib_info->forw, ARCH_CONVERT) != last_blkno ||
+ INT_GET(sib_info->magic, ARCH_CONVERT) != INT_GET(dead_info->magic, ARCH_CONVERT))) {
+ XFS_ERROR_REPORT("xfs_da_swap_lastblock(2)",
+ XFS_ERRLEVEL_LOW, mp);
+ error = XFS_ERROR(EFSCORRUPTED);
+ goto done;
+ }
+ INT_SET(sib_info->forw, ARCH_CONVERT, dead_blkno);
+ xfs_da_log_buf(tp, sib_buf,
+ XFS_DA_LOGRANGE(sib_info, &sib_info->forw,
+ sizeof(sib_info->forw)));
+ xfs_da_buf_done(sib_buf);
+ sib_buf = NULL;
+ }
+ /*
+ * If the moved block has a right sibling, fix up the pointers.
+ */
+ if ((sib_blkno = INT_GET(dead_info->forw, ARCH_CONVERT))) {
+ if ((error = xfs_da_read_buf(tp, ip, sib_blkno, -1, &sib_buf, w)))
+ goto done;
+ sib_info = sib_buf->data;
+ if (unlikely(
+ INT_GET(sib_info->back, ARCH_CONVERT) != last_blkno
+ || INT_GET(sib_info->magic, ARCH_CONVERT)
+ != INT_GET(dead_info->magic, ARCH_CONVERT))) {
+ XFS_ERROR_REPORT("xfs_da_swap_lastblock(3)",
+ XFS_ERRLEVEL_LOW, mp);
+ error = XFS_ERROR(EFSCORRUPTED);
+ goto done;
+ }
+ INT_SET(sib_info->back, ARCH_CONVERT, dead_blkno);
+ xfs_da_log_buf(tp, sib_buf,
+ XFS_DA_LOGRANGE(sib_info, &sib_info->back,
+ sizeof(sib_info->back)));
+ xfs_da_buf_done(sib_buf);
+ sib_buf = NULL;
+ }
+ par_blkno = XFS_DIR_IS_V1(mp) ? 0 : mp->m_dirleafblk;
+ level = -1;
+ /*
+ * Walk down the tree looking for the parent of the moved block.
+ */
+ for (;;) {
+ if ((error = xfs_da_read_buf(tp, ip, par_blkno, -1, &par_buf, w)))
+ goto done;
+ par_node = par_buf->data;
+ if (unlikely(
+ INT_GET(par_node->hdr.info.magic, ARCH_CONVERT) != XFS_DA_NODE_MAGIC ||
+ (level >= 0 && level != INT_GET(par_node->hdr.level, ARCH_CONVERT) + 1))) {
+ XFS_ERROR_REPORT("xfs_da_swap_lastblock(4)",
+ XFS_ERRLEVEL_LOW, mp);
+ error = XFS_ERROR(EFSCORRUPTED);
+ goto done;
+ }
+ level = INT_GET(par_node->hdr.level, ARCH_CONVERT);
+ for (entno = 0;
+ entno < INT_GET(par_node->hdr.count, ARCH_CONVERT) &&
+ INT_GET(par_node->btree[entno].hashval, ARCH_CONVERT) < dead_hash;
+ entno++)
+ continue;
+ if (unlikely(entno == INT_GET(par_node->hdr.count, ARCH_CONVERT))) {
+ XFS_ERROR_REPORT("xfs_da_swap_lastblock(5)",
+ XFS_ERRLEVEL_LOW, mp);
+ error = XFS_ERROR(EFSCORRUPTED);
+ goto done;
+ }
+ par_blkno = INT_GET(par_node->btree[entno].before, ARCH_CONVERT);
+ if (level == dead_level + 1)
+ break;
+ xfs_da_brelse(tp, par_buf);
+ par_buf = NULL;
+ }
+ /*
+ * We're in the right parent block.
+ * Look for the right entry.
+ */
+ for (;;) {
+ for (;
+ entno < INT_GET(par_node->hdr.count, ARCH_CONVERT) &&
+ INT_GET(par_node->btree[entno].before, ARCH_CONVERT) != last_blkno;
+ entno++)
+ continue;
+ if (entno < INT_GET(par_node->hdr.count, ARCH_CONVERT))
+ break;
+ par_blkno = INT_GET(par_node->hdr.info.forw, ARCH_CONVERT);
+ xfs_da_brelse(tp, par_buf);
+ par_buf = NULL;
+ if (unlikely(par_blkno == 0)) {
+ XFS_ERROR_REPORT("xfs_da_swap_lastblock(6)",
+ XFS_ERRLEVEL_LOW, mp);
+ error = XFS_ERROR(EFSCORRUPTED);
+ goto done;
+ }
+ if ((error = xfs_da_read_buf(tp, ip, par_blkno, -1, &par_buf, w)))
+ goto done;
+ par_node = par_buf->data;
+ if (unlikely(
+ INT_GET(par_node->hdr.level, ARCH_CONVERT) != level ||
+ INT_GET(par_node->hdr.info.magic, ARCH_CONVERT) != XFS_DA_NODE_MAGIC)) {
+ XFS_ERROR_REPORT("xfs_da_swap_lastblock(7)",
+ XFS_ERRLEVEL_LOW, mp);
+ error = XFS_ERROR(EFSCORRUPTED);
+ goto done;
+ }
+ entno = 0;
+ }
+ /*
+ * Update the parent entry pointing to the moved block.
+ */
+ INT_SET(par_node->btree[entno].before, ARCH_CONVERT, dead_blkno);
+ xfs_da_log_buf(tp, par_buf,
+ XFS_DA_LOGRANGE(par_node, &par_node->btree[entno].before,
+ sizeof(par_node->btree[entno].before)));
+ xfs_da_buf_done(par_buf);
+ xfs_da_buf_done(dead_buf);
+ *dead_blknop = last_blkno;
+ *dead_bufp = last_buf;
+ return 0;
+done:
+ if (par_buf)
+ xfs_da_brelse(tp, par_buf);
+ if (sib_buf)
+ xfs_da_brelse(tp, sib_buf);
+ xfs_da_brelse(tp, last_buf);
+ return error;
+}
+
+/*
+ * Remove a btree block from a directory or attribute.
+ */
+int
+xfs_da_shrink_inode(xfs_da_args_t *args, xfs_dablk_t dead_blkno,
+ xfs_dabuf_t *dead_buf)
+{
+ xfs_inode_t *dp;
+ int done, error, w, count;
+ xfs_fileoff_t bno;
+ xfs_fsize_t size;
+ xfs_trans_t *tp;
+ xfs_mount_t *mp;
+
+ dp = args->dp;
+ w = args->whichfork;
+ tp = args->trans;
+ mp = dp->i_mount;
+ if (w == XFS_DATA_FORK && XFS_DIR_IS_V2(mp))
+ count = mp->m_dirblkfsbs;
+ else
+ count = 1;
+ for (;;) {
+ /*
+ * Remove extents. If we get ENOSPC for a dir we have to move
+ * the last block to the place we want to kill.
+ */
+ if ((error = xfs_bunmapi(tp, dp, dead_blkno, count,
+ XFS_BMAPI_AFLAG(w)|XFS_BMAPI_METADATA,
+ 0, args->firstblock, args->flist,
+ &done)) == ENOSPC) {
+ if (w != XFS_DATA_FORK)
+ goto done;
+ if ((error = xfs_da_swap_lastblock(args, &dead_blkno,
+ &dead_buf)))
+ goto done;
+ } else if (error)
+ goto done;
+ else
+ break;
+ }
+ ASSERT(done);
+ xfs_da_binval(tp, dead_buf);
+ /*
+ * Adjust the directory size for version 1.
+ */
+ if (w == XFS_DATA_FORK && XFS_DIR_IS_V1(mp)) {
+ if ((error = xfs_bmap_last_offset(tp, dp, &bno, w)))
+ return error;
+ size = XFS_FSB_TO_B(dp->i_mount, bno);
+ if (size != dp->i_d.di_size) {
+ dp->i_d.di_size = size;
+ xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
+ }
+ }
+ return 0;
+done:
+ xfs_da_binval(tp, dead_buf);
+ return error;
+}
+
+/*
+ * See if the mapping(s) for this btree block are valid, i.e.
+ * don't contain holes, are logically contiguous, and cover the whole range.
+ */
+STATIC int
+xfs_da_map_covers_blocks(
+ int nmap,
+ xfs_bmbt_irec_t *mapp,
+ xfs_dablk_t bno,
+ int count)
+{
+ int i;
+ xfs_fileoff_t off;
+
+ for (i = 0, off = bno; i < nmap; i++) {
+ if (mapp[i].br_startblock == HOLESTARTBLOCK ||
+ mapp[i].br_startblock == DELAYSTARTBLOCK) {
+ return 0;
+ }
+ if (off != mapp[i].br_startoff) {
+ return 0;
+ }
+ off += mapp[i].br_blockcount;
+ }
+ return off == bno + count;
+}
+
+/*
+ * Make a dabuf.
+ * Used for get_buf, read_buf, read_bufr, and reada_buf.
+ */
+STATIC int
+xfs_da_do_buf(
+ xfs_trans_t *trans,
+ xfs_inode_t *dp,
+ xfs_dablk_t bno,
+ xfs_daddr_t *mappedbnop,
+ xfs_dabuf_t **bpp,
+ int whichfork,
+ int caller,
+ inst_t *ra)
+{
+ xfs_buf_t *bp = 0;
+ xfs_buf_t **bplist;
+ int error=0;
+ int i;
+ xfs_bmbt_irec_t map;
+ xfs_bmbt_irec_t *mapp;
+ xfs_daddr_t mappedbno;
+ xfs_mount_t *mp;
+ int nbplist=0;
+ int nfsb;
+ int nmap;
+ xfs_dabuf_t *rbp;
+
+ mp = dp->i_mount;
+ if (whichfork == XFS_DATA_FORK && XFS_DIR_IS_V2(mp))
+ nfsb = mp->m_dirblkfsbs;
+ else
+ nfsb = 1;
+ mappedbno = *mappedbnop;
+ /*
+ * Caller doesn't have a mapping. -2 means don't complain
+ * if we land in a hole.
+ */
+ if (mappedbno == -1 || mappedbno == -2) {
+ /*
+ * Optimize the one-block case.
+ */
+ if (nfsb == 1) {
+ xfs_fsblock_t fsb;
+
+ if ((error =
+ xfs_bmapi_single(trans, dp, whichfork, &fsb,
+ (xfs_fileoff_t)bno))) {
+ return error;
+ }
+ mapp = ↦
+ if (fsb == NULLFSBLOCK) {
+ nmap = 0;
+ } else {
+ map.br_startblock = fsb;
+ map.br_startoff = (xfs_fileoff_t)bno;
+ map.br_blockcount = 1;
+ nmap = 1;
+ }
+ } else {
+ mapp = kmem_alloc(sizeof(*mapp) * nfsb, KM_SLEEP);
+ nmap = nfsb;
+ if ((error = xfs_bmapi(trans, dp, (xfs_fileoff_t)bno,
+ nfsb,
+ XFS_BMAPI_METADATA |
+ XFS_BMAPI_AFLAG(whichfork),
+ NULL, 0, mapp, &nmap, NULL)))
+ goto exit0;
+ }
+ } else {
+ map.br_startblock = XFS_DADDR_TO_FSB(mp, mappedbno);
+ map.br_startoff = (xfs_fileoff_t)bno;
+ map.br_blockcount = nfsb;
+ mapp = ↦
+ nmap = 1;
+ }
+ if (!xfs_da_map_covers_blocks(nmap, mapp, bno, nfsb)) {
+ error = mappedbno == -2 ? 0 : XFS_ERROR(EFSCORRUPTED);
+ if (unlikely(error == EFSCORRUPTED)) {
+ if (xfs_error_level >= XFS_ERRLEVEL_LOW) {
+ int i;
+ cmn_err(CE_ALERT, "xfs_da_do_buf: bno %lld\n",
+ (long long)bno);
+ cmn_err(CE_ALERT, "dir: inode %lld\n",
+ (long long)dp->i_ino);
+ for (i = 0; i < nmap; i++) {
+ cmn_err(CE_ALERT,
+ "[%02d] br_startoff %lld br_startblock %lld br_blockcount %lld br_state %d\n",
+ i,
+ mapp[i].br_startoff,
+ mapp[i].br_startblock,
+ mapp[i].br_blockcount,
+ mapp[i].br_state);
+ }
+ }
+ XFS_ERROR_REPORT("xfs_da_do_buf(1)",
+ XFS_ERRLEVEL_LOW, mp);
+ }
+ goto exit0;
+ }
+ if (caller != 3 && nmap > 1) {
+ bplist = kmem_alloc(sizeof(*bplist) * nmap, KM_SLEEP);
+ nbplist = 0;
+ } else
+ bplist = NULL;
+ /*
+ * Turn the mapping(s) into buffer(s).
+ */
+ for (i = 0; i < nmap; i++) {
+ int nmapped;
+
+ mappedbno = XFS_FSB_TO_DADDR(mp, mapp[i].br_startblock);
+ if (i == 0)
+ *mappedbnop = mappedbno;
+ nmapped = (int)XFS_FSB_TO_BB(mp, mapp[i].br_blockcount);
+ switch (caller) {
+ case 0:
+ bp = xfs_trans_get_buf(trans, mp->m_ddev_targp,
+ mappedbno, nmapped, 0);
+ error = bp ? XFS_BUF_GETERROR(bp) : XFS_ERROR(EIO);
+ break;
+ case 1:
+#ifndef __KERNEL__
+ case 2:
+#endif
+ bp = NULL;
+ error = xfs_trans_read_buf(mp, trans, mp->m_ddev_targp,
+ mappedbno, nmapped, 0, &bp);
+ break;
+#ifdef __KERNEL__
+ case 3:
+ xfs_baread(mp->m_ddev_targp, mappedbno, nmapped);
+ error = 0;
+ bp = NULL;
+ break;
+#endif
+ }
+ if (error) {
+ if (bp)
+ xfs_trans_brelse(trans, bp);
+ goto exit1;
+ }
+ if (!bp)
+ continue;
+ if (caller == 1) {
+ if (whichfork == XFS_ATTR_FORK) {
+ XFS_BUF_SET_VTYPE_REF(bp, B_FS_ATTR_BTREE,
+ XFS_ATTR_BTREE_REF);
+ } else {
+ XFS_BUF_SET_VTYPE_REF(bp, B_FS_DIR_BTREE,
+ XFS_DIR_BTREE_REF);
+ }
+ }
+ if (bplist) {
+ bplist[nbplist++] = bp;
+ }
+ }
+ /*
+ * Build a dabuf structure.
+ */
+ if (bplist) {
+ rbp = xfs_da_buf_make(nbplist, bplist, ra);
+ } else if (bp)
+ rbp = xfs_da_buf_make(1, &bp, ra);
+ else
+ rbp = NULL;
+ /*
+ * For read_buf, check the magic number.
+ */
+ if (caller == 1) {
+ xfs_dir2_data_t *data;
+ xfs_dir2_free_t *free;
+ xfs_da_blkinfo_t *info;
+ uint magic, magic1;
+
+ info = rbp->data;
+ data = rbp->data;
+ free = rbp->data;
+ magic = INT_GET(info->magic, ARCH_CONVERT);
+ magic1 = INT_GET(data->hdr.magic, ARCH_CONVERT);
+ if (unlikely(
+ XFS_TEST_ERROR((magic != XFS_DA_NODE_MAGIC) &&
+ (magic != XFS_DIR_LEAF_MAGIC) &&
+ (magic != XFS_ATTR_LEAF_MAGIC) &&
+ (magic != XFS_DIR2_LEAF1_MAGIC) &&
+ (magic != XFS_DIR2_LEAFN_MAGIC) &&
+ (magic1 != XFS_DIR2_BLOCK_MAGIC) &&
+ (magic1 != XFS_DIR2_DATA_MAGIC) &&
+ (INT_GET(free->hdr.magic, ARCH_CONVERT) != XFS_DIR2_FREE_MAGIC),
+ mp, XFS_ERRTAG_DA_READ_BUF,
+ XFS_RANDOM_DA_READ_BUF))) {
+ xfs_buftrace("DA READ ERROR", rbp->bps[0]);
+ XFS_CORRUPTION_ERROR("xfs_da_do_buf(2)",
+ XFS_ERRLEVEL_LOW, mp, info);
+ error = XFS_ERROR(EFSCORRUPTED);
+ xfs_da_brelse(trans, rbp);
+ nbplist = 0;
+ goto exit1;
+ }
+ }
+ if (bplist) {
+ kmem_free(bplist, sizeof(*bplist) * nmap);
+ }
+ if (mapp != &map) {
+ kmem_free(mapp, sizeof(*mapp) * nfsb);
+ }
+ if (bpp)
+ *bpp = rbp;
+ return 0;
+exit1:
+ if (bplist) {
+ for (i = 0; i < nbplist; i++)
+ xfs_trans_brelse(trans, bplist[i]);
+ kmem_free(bplist, sizeof(*bplist) * nmap);
+ }
+exit0:
+ if (mapp != &map)
+ kmem_free(mapp, sizeof(*mapp) * nfsb);
+ if (bpp)
+ *bpp = NULL;
+ return error;
+}
+
+/*
+ * Get a buffer for the dir/attr block.
+ */
+int
+xfs_da_get_buf(
+ xfs_trans_t *trans,
+ xfs_inode_t *dp,
+ xfs_dablk_t bno,
+ xfs_daddr_t mappedbno,
+ xfs_dabuf_t **bpp,
+ int whichfork)
+{
+ return xfs_da_do_buf(trans, dp, bno, &mappedbno, bpp, whichfork, 0,
+ (inst_t *)__return_address);
+}
+
+/*
+ * Get a buffer for the dir/attr block, fill in the contents.
+ */
+int
+xfs_da_read_buf(
+ xfs_trans_t *trans,
+ xfs_inode_t *dp,
+ xfs_dablk_t bno,
+ xfs_daddr_t mappedbno,
+ xfs_dabuf_t **bpp,
+ int whichfork)
+{
+ return xfs_da_do_buf(trans, dp, bno, &mappedbno, bpp, whichfork, 1,
+ (inst_t *)__return_address);
+}
+
+/*
+ * Readahead the dir/attr block.
+ */
+xfs_daddr_t
+xfs_da_reada_buf(
+ xfs_trans_t *trans,
+ xfs_inode_t *dp,
+ xfs_dablk_t bno,
+ int whichfork)
+{
+ xfs_daddr_t rval;
+
+ rval = -1;
+ if (xfs_da_do_buf(trans, dp, bno, &rval, NULL, whichfork, 3,
+ (inst_t *)__return_address))
+ return -1;
+ else
+ return rval;
+}
+
+/*
+ * Calculate the number of bits needed to hold i different values.
+ */
+uint
+xfs_da_log2_roundup(uint i)
+{
+ uint rval;
+
+ for (rval = 0; rval < NBBY * sizeof(i); rval++) {
+ if ((1 << rval) >= i)
+ break;
+ }
+ return(rval);
+}
+
+kmem_zone_t *xfs_da_state_zone; /* anchor for state struct zone */
+kmem_zone_t *xfs_dabuf_zone; /* dabuf zone */
+
+/*
+ * Allocate a dir-state structure.
+ * We don't put them on the stack since they're large.
+ */
+xfs_da_state_t *
+xfs_da_state_alloc(void)
+{
+ return kmem_zone_zalloc(xfs_da_state_zone, KM_SLEEP);
+}
+
+/*
+ * Kill the altpath contents of a da-state structure.
+ */
+void
+xfs_da_state_kill_altpath(xfs_da_state_t *state)
+{
+ int i;
+
+ for (i = 0; i < state->altpath.active; i++) {
+ if (state->altpath.blk[i].bp) {
+ if (state->altpath.blk[i].bp != state->path.blk[i].bp)
+ xfs_da_buf_done(state->altpath.blk[i].bp);
+ state->altpath.blk[i].bp = NULL;
+ }
+ }
+ state->altpath.active = 0;
+}
+
+/*
+ * Free a da-state structure.
+ */
+void
+xfs_da_state_free(xfs_da_state_t *state)
+{
+ int i;
+
+ xfs_da_state_kill_altpath(state);
+ for (i = 0; i < state->path.active; i++) {
+ if (state->path.blk[i].bp)
+ xfs_da_buf_done(state->path.blk[i].bp);
+ }
+ if (state->extravalid && state->extrablk.bp)
+ xfs_da_buf_done(state->extrablk.bp);
+#ifdef DEBUG
+ memset((char *)state, 0, sizeof(*state));
+#endif /* DEBUG */
+ kmem_zone_free(xfs_da_state_zone, state);
+}
+
+#ifdef XFS_DABUF_DEBUG
+xfs_dabuf_t *xfs_dabuf_global_list;
+lock_t xfs_dabuf_global_lock;
+#endif
+
+/*
+ * Create a dabuf.
+ */
+/* ARGSUSED */
+STATIC xfs_dabuf_t *
+xfs_da_buf_make(int nbuf, xfs_buf_t **bps, inst_t *ra)
+{
+ xfs_buf_t *bp;
+ xfs_dabuf_t *dabuf;
+ int i;
+ int off;
+
+ if (nbuf == 1)
+ dabuf = kmem_zone_alloc(xfs_dabuf_zone, KM_SLEEP);
+ else
+ dabuf = kmem_alloc(XFS_DA_BUF_SIZE(nbuf), KM_SLEEP);
+ dabuf->dirty = 0;
+#ifdef XFS_DABUF_DEBUG
+ dabuf->ra = ra;
+ dabuf->target = XFS_BUF_TARGET(bps[0]);
+ dabuf->blkno = XFS_BUF_ADDR(bps[0]);
+#endif
+ if (nbuf == 1) {
+ dabuf->nbuf = 1;
+ bp = bps[0];
+ dabuf->bbcount = (short)BTOBB(XFS_BUF_COUNT(bp));
+ dabuf->data = XFS_BUF_PTR(bp);
+ dabuf->bps[0] = bp;
+ } else {
+ dabuf->nbuf = nbuf;
+ for (i = 0, dabuf->bbcount = 0; i < nbuf; i++) {
+ dabuf->bps[i] = bp = bps[i];
+ dabuf->bbcount += BTOBB(XFS_BUF_COUNT(bp));
+ }
+ dabuf->data = kmem_alloc(BBTOB(dabuf->bbcount), KM_SLEEP);
+ for (i = off = 0; i < nbuf; i++, off += XFS_BUF_COUNT(bp)) {
+ bp = bps[i];
+ memcpy((char *)dabuf->data + off, XFS_BUF_PTR(bp),
+ XFS_BUF_COUNT(bp));
+ }
+ }
+#ifdef XFS_DABUF_DEBUG
+ {
+ SPLDECL(s);
+ xfs_dabuf_t *p;
+
+ s = mutex_spinlock(&xfs_dabuf_global_lock);
+ for (p = xfs_dabuf_global_list; p; p = p->next) {
+ ASSERT(p->blkno != dabuf->blkno ||
+ p->target != dabuf->target);
+ }
+ dabuf->prev = NULL;
+ if (xfs_dabuf_global_list)
+ xfs_dabuf_global_list->prev = dabuf;
+ dabuf->next = xfs_dabuf_global_list;
+ xfs_dabuf_global_list = dabuf;
+ mutex_spinunlock(&xfs_dabuf_global_lock, s);
+ }
+#endif
+ return dabuf;
+}
+
+/*
+ * Un-dirty a dabuf.
+ */
+STATIC void
+xfs_da_buf_clean(xfs_dabuf_t *dabuf)
+{
+ xfs_buf_t *bp;
+ int i;
+ int off;
+
+ if (dabuf->dirty) {
+ ASSERT(dabuf->nbuf > 1);
+ dabuf->dirty = 0;
+ for (i = off = 0; i < dabuf->nbuf;
+ i++, off += XFS_BUF_COUNT(bp)) {
+ bp = dabuf->bps[i];
+ memcpy(XFS_BUF_PTR(bp), (char *)dabuf->data + off,
+ XFS_BUF_COUNT(bp));
+ }
+ }
+}
+
+/*
+ * Release a dabuf.
+ */
+void
+xfs_da_buf_done(xfs_dabuf_t *dabuf)
+{
+ ASSERT(dabuf);
+ ASSERT(dabuf->nbuf && dabuf->data && dabuf->bbcount && dabuf->bps[0]);
+ if (dabuf->dirty)
+ xfs_da_buf_clean(dabuf);
+ if (dabuf->nbuf > 1)
+ kmem_free(dabuf->data, BBTOB(dabuf->bbcount));
+#ifdef XFS_DABUF_DEBUG
+ {
+ SPLDECL(s);
+
+ s = mutex_spinlock(&xfs_dabuf_global_lock);
+ if (dabuf->prev)
+ dabuf->prev->next = dabuf->next;
+ else
+ xfs_dabuf_global_list = dabuf->next;
+ if (dabuf->next)
+ dabuf->next->prev = dabuf->prev;
+ mutex_spinunlock(&xfs_dabuf_global_lock, s);
+ }
+ memset(dabuf, 0, XFS_DA_BUF_SIZE(dabuf->nbuf));
+#endif
+ if (dabuf->nbuf == 1)
+ kmem_zone_free(xfs_dabuf_zone, dabuf);
+ else
+ kmem_free(dabuf, XFS_DA_BUF_SIZE(dabuf->nbuf));
+}
+
+/*
+ * Log transaction from a dabuf.
+ */
+void
+xfs_da_log_buf(xfs_trans_t *tp, xfs_dabuf_t *dabuf, uint first, uint last)
+{
+ xfs_buf_t *bp;
+ uint f;
+ int i;
+ uint l;
+ int off;
+
+ ASSERT(dabuf->nbuf && dabuf->data && dabuf->bbcount && dabuf->bps[0]);
+ if (dabuf->nbuf == 1) {
+ ASSERT(dabuf->data == (void *)XFS_BUF_PTR(dabuf->bps[0]));
+ xfs_trans_log_buf(tp, dabuf->bps[0], first, last);
+ return;
+ }
+ dabuf->dirty = 1;
+ ASSERT(first <= last);
+ for (i = off = 0; i < dabuf->nbuf; i++, off += XFS_BUF_COUNT(bp)) {
+ bp = dabuf->bps[i];
+ f = off;
+ l = f + XFS_BUF_COUNT(bp) - 1;
+ if (f < first)
+ f = first;
+ if (l > last)
+ l = last;
+ if (f <= l)
+ xfs_trans_log_buf(tp, bp, f - off, l - off);
+ /*
+ * B_DONE is set by xfs_trans_log buf.
+ * If we don't set it on a new buffer (get not read)
+ * then if we don't put anything in the buffer it won't
+ * be set, and at commit it it released into the cache,
+ * and then a read will fail.
+ */
+ else if (!(XFS_BUF_ISDONE(bp)))
+ XFS_BUF_DONE(bp);
+ }
+ ASSERT(last < off);
+}
+
+/*
+ * Release dabuf from a transaction.
+ * Have to free up the dabuf before the buffers are released,
+ * since the synchronization on the dabuf is really the lock on the buffer.
+ */
+void
+xfs_da_brelse(xfs_trans_t *tp, xfs_dabuf_t *dabuf)
+{
+ xfs_buf_t *bp;
+ xfs_buf_t **bplist;
+ int i;
+ int nbuf;
+
+ ASSERT(dabuf->nbuf && dabuf->data && dabuf->bbcount && dabuf->bps[0]);
+ if ((nbuf = dabuf->nbuf) == 1) {
+ bplist = &bp;
+ bp = dabuf->bps[0];
+ } else {
+ bplist = kmem_alloc(nbuf * sizeof(*bplist), KM_SLEEP);
+ memcpy(bplist, dabuf->bps, nbuf * sizeof(*bplist));
+ }
+ xfs_da_buf_done(dabuf);
+ for (i = 0; i < nbuf; i++)
+ xfs_trans_brelse(tp, bplist[i]);
+ if (bplist != &bp)
+ kmem_free(bplist, nbuf * sizeof(*bplist));
+}
+
+/*
+ * Invalidate dabuf from a transaction.
+ */
+void
+xfs_da_binval(xfs_trans_t *tp, xfs_dabuf_t *dabuf)
+{
+ xfs_buf_t *bp;
+ xfs_buf_t **bplist;
+ int i;
+ int nbuf;
+
+ ASSERT(dabuf->nbuf && dabuf->data && dabuf->bbcount && dabuf->bps[0]);
+ if ((nbuf = dabuf->nbuf) == 1) {
+ bplist = &bp;
+ bp = dabuf->bps[0];
+ } else {
+ bplist = kmem_alloc(nbuf * sizeof(*bplist), KM_SLEEP);
+ memcpy(bplist, dabuf->bps, nbuf * sizeof(*bplist));
+ }
+ xfs_da_buf_done(dabuf);
+ for (i = 0; i < nbuf; i++)
+ xfs_trans_binval(tp, bplist[i]);
+ if (bplist != &bp)
+ kmem_free(bplist, nbuf * sizeof(*bplist));
+}
+
+/*
+ * Get the first daddr from a dabuf.
+ */
+xfs_daddr_t
+xfs_da_blkno(xfs_dabuf_t *dabuf)
+{
+ ASSERT(dabuf->nbuf);
+ ASSERT(dabuf->data);
+ return XFS_BUF_ADDR(dabuf->bps[0]);
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)