1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2094 lines
62 KiB
C
2094 lines
62 KiB
C
/*
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* Copyright (c) 2000-2001 Silicon Graphics, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Further, this software is distributed without any warranty that it is
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* free of the rightful claim of any third person regarding infringement
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* or the like. Any license provided herein, whether implied or
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* otherwise, applies only to this software file. Patent licenses, if
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* any, provided herein do not apply to combinations of this program with
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* other software, or any other product whatsoever.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write the Free Software Foundation, Inc., 59
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* Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
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* Mountain View, CA 94043, or:
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*
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* http://www.sgi.com
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*
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* For further information regarding this notice, see:
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*
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* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
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*/
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#include "xfs.h"
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#include "xfs_macros.h"
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#include "xfs_types.h"
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#include "xfs_inum.h"
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#include "xfs_log.h"
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#include "xfs_trans.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "xfs_dir.h"
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#include "xfs_dmapi.h"
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#include "xfs_mount.h"
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#include "xfs_alloc_btree.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_ialloc_btree.h"
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#include "xfs_btree.h"
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#include "xfs_ialloc.h"
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#include "xfs_alloc.h"
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#include "xfs_error.h"
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/*
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* Inode allocation management for XFS.
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*/
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/*
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* Prototypes for internal functions.
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*/
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STATIC void xfs_inobt_log_block(xfs_trans_t *, xfs_buf_t *, int);
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STATIC void xfs_inobt_log_keys(xfs_btree_cur_t *, xfs_buf_t *, int, int);
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STATIC void xfs_inobt_log_ptrs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
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STATIC void xfs_inobt_log_recs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
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STATIC int xfs_inobt_lshift(xfs_btree_cur_t *, int, int *);
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STATIC int xfs_inobt_newroot(xfs_btree_cur_t *, int *);
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STATIC int xfs_inobt_rshift(xfs_btree_cur_t *, int, int *);
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STATIC int xfs_inobt_split(xfs_btree_cur_t *, int, xfs_agblock_t *,
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xfs_inobt_key_t *, xfs_btree_cur_t **, int *);
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STATIC int xfs_inobt_updkey(xfs_btree_cur_t *, xfs_inobt_key_t *, int);
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/*
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* Internal functions.
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*/
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/*
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* Single level of the xfs_inobt_delete record deletion routine.
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* Delete record pointed to by cur/level.
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* Remove the record from its block then rebalance the tree.
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* Return 0 for error, 1 for done, 2 to go on to the next level.
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*/
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STATIC int /* error */
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xfs_inobt_delrec(
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xfs_btree_cur_t *cur, /* btree cursor */
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int level, /* level removing record from */
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int *stat) /* fail/done/go-on */
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{
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xfs_buf_t *agbp; /* buffer for a.g. inode header */
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xfs_mount_t *mp; /* mount structure */
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xfs_agi_t *agi; /* allocation group inode header */
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xfs_inobt_block_t *block; /* btree block record/key lives in */
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xfs_agblock_t bno; /* btree block number */
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xfs_buf_t *bp; /* buffer for block */
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int error; /* error return value */
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int i; /* loop index */
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xfs_inobt_key_t key; /* kp points here if block is level 0 */
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xfs_inobt_key_t *kp = NULL; /* pointer to btree keys */
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xfs_agblock_t lbno; /* left block's block number */
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xfs_buf_t *lbp; /* left block's buffer pointer */
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xfs_inobt_block_t *left; /* left btree block */
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xfs_inobt_key_t *lkp; /* left block key pointer */
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xfs_inobt_ptr_t *lpp; /* left block address pointer */
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int lrecs = 0; /* number of records in left block */
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xfs_inobt_rec_t *lrp; /* left block record pointer */
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xfs_inobt_ptr_t *pp = NULL; /* pointer to btree addresses */
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int ptr; /* index in btree block for this rec */
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xfs_agblock_t rbno; /* right block's block number */
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xfs_buf_t *rbp; /* right block's buffer pointer */
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xfs_inobt_block_t *right; /* right btree block */
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xfs_inobt_key_t *rkp; /* right block key pointer */
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xfs_inobt_rec_t *rp; /* pointer to btree records */
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xfs_inobt_ptr_t *rpp; /* right block address pointer */
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int rrecs = 0; /* number of records in right block */
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int numrecs;
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xfs_inobt_rec_t *rrp; /* right block record pointer */
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xfs_btree_cur_t *tcur; /* temporary btree cursor */
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mp = cur->bc_mp;
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/*
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* Get the index of the entry being deleted, check for nothing there.
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*/
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ptr = cur->bc_ptrs[level];
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if (ptr == 0) {
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*stat = 0;
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return 0;
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}
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/*
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* Get the buffer & block containing the record or key/ptr.
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*/
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bp = cur->bc_bufs[level];
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block = XFS_BUF_TO_INOBT_BLOCK(bp);
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#ifdef DEBUG
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if ((error = xfs_btree_check_sblock(cur, block, level, bp)))
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return error;
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#endif
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/*
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* Fail if we're off the end of the block.
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*/
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numrecs = INT_GET(block->bb_numrecs, ARCH_CONVERT);
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if (ptr > numrecs) {
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*stat = 0;
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return 0;
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}
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/*
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* It's a nonleaf. Excise the key and ptr being deleted, by
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* sliding the entries past them down one.
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* Log the changed areas of the block.
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*/
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if (level > 0) {
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kp = XFS_INOBT_KEY_ADDR(block, 1, cur);
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pp = XFS_INOBT_PTR_ADDR(block, 1, cur);
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#ifdef DEBUG
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for (i = ptr; i < numrecs; i++) {
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if ((error = xfs_btree_check_sptr(cur, INT_GET(pp[i], ARCH_CONVERT), level)))
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return error;
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}
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#endif
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if (ptr < numrecs) {
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memmove(&kp[ptr - 1], &kp[ptr],
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(numrecs - ptr) * sizeof(*kp));
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memmove(&pp[ptr - 1], &pp[ptr],
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(numrecs - ptr) * sizeof(*kp));
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xfs_inobt_log_keys(cur, bp, ptr, numrecs - 1);
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xfs_inobt_log_ptrs(cur, bp, ptr, numrecs - 1);
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}
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}
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/*
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* It's a leaf. Excise the record being deleted, by sliding the
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* entries past it down one. Log the changed areas of the block.
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*/
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else {
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rp = XFS_INOBT_REC_ADDR(block, 1, cur);
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if (ptr < numrecs) {
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memmove(&rp[ptr - 1], &rp[ptr],
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(numrecs - ptr) * sizeof(*rp));
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xfs_inobt_log_recs(cur, bp, ptr, numrecs - 1);
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}
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/*
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* If it's the first record in the block, we'll need a key
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* structure to pass up to the next level (updkey).
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*/
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if (ptr == 1) {
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key.ir_startino = rp->ir_startino;
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kp = &key;
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}
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}
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/*
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* Decrement and log the number of entries in the block.
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*/
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numrecs--;
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INT_SET(block->bb_numrecs, ARCH_CONVERT, numrecs);
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xfs_inobt_log_block(cur->bc_tp, bp, XFS_BB_NUMRECS);
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/*
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* Is this the root level? If so, we're almost done.
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*/
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if (level == cur->bc_nlevels - 1) {
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/*
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* If this is the root level,
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* and there's only one entry left,
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* and it's NOT the leaf level,
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* then we can get rid of this level.
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*/
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if (numrecs == 1 && level > 0) {
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agbp = cur->bc_private.i.agbp;
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agi = XFS_BUF_TO_AGI(agbp);
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/*
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* pp is still set to the first pointer in the block.
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* Make it the new root of the btree.
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*/
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bno = INT_GET(agi->agi_root, ARCH_CONVERT);
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agi->agi_root = *pp;
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INT_MOD(agi->agi_level, ARCH_CONVERT, -1);
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/*
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* Free the block.
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*/
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if ((error = xfs_free_extent(cur->bc_tp,
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XFS_AGB_TO_FSB(mp, cur->bc_private.i.agno, bno), 1)))
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return error;
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xfs_trans_binval(cur->bc_tp, bp);
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xfs_ialloc_log_agi(cur->bc_tp, agbp,
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XFS_AGI_ROOT | XFS_AGI_LEVEL);
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/*
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* Update the cursor so there's one fewer level.
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*/
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cur->bc_bufs[level] = NULL;
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cur->bc_nlevels--;
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} else if (level > 0 &&
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(error = xfs_inobt_decrement(cur, level, &i)))
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return error;
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*stat = 1;
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return 0;
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}
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/*
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* If we deleted the leftmost entry in the block, update the
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* key values above us in the tree.
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*/
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if (ptr == 1 && (error = xfs_inobt_updkey(cur, kp, level + 1)))
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return error;
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/*
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* If the number of records remaining in the block is at least
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* the minimum, we're done.
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*/
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if (numrecs >= XFS_INOBT_BLOCK_MINRECS(level, cur)) {
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if (level > 0 &&
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(error = xfs_inobt_decrement(cur, level, &i)))
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return error;
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*stat = 1;
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return 0;
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}
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/*
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* Otherwise, we have to move some records around to keep the
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* tree balanced. Look at the left and right sibling blocks to
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* see if we can re-balance by moving only one record.
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*/
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rbno = INT_GET(block->bb_rightsib, ARCH_CONVERT);
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lbno = INT_GET(block->bb_leftsib, ARCH_CONVERT);
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bno = NULLAGBLOCK;
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ASSERT(rbno != NULLAGBLOCK || lbno != NULLAGBLOCK);
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/*
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* Duplicate the cursor so our btree manipulations here won't
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* disrupt the next level up.
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*/
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if ((error = xfs_btree_dup_cursor(cur, &tcur)))
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return error;
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/*
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* If there's a right sibling, see if it's ok to shift an entry
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* out of it.
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*/
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if (rbno != NULLAGBLOCK) {
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/*
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* Move the temp cursor to the last entry in the next block.
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* Actually any entry but the first would suffice.
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*/
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i = xfs_btree_lastrec(tcur, level);
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XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
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if ((error = xfs_inobt_increment(tcur, level, &i)))
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goto error0;
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XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
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i = xfs_btree_lastrec(tcur, level);
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XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
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/*
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* Grab a pointer to the block.
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*/
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rbp = tcur->bc_bufs[level];
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right = XFS_BUF_TO_INOBT_BLOCK(rbp);
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#ifdef DEBUG
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if ((error = xfs_btree_check_sblock(cur, right, level, rbp)))
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goto error0;
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#endif
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/*
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* Grab the current block number, for future use.
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*/
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bno = INT_GET(right->bb_leftsib, ARCH_CONVERT);
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/*
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* If right block is full enough so that removing one entry
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* won't make it too empty, and left-shifting an entry out
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* of right to us works, we're done.
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*/
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if (INT_GET(right->bb_numrecs, ARCH_CONVERT) - 1 >=
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XFS_INOBT_BLOCK_MINRECS(level, cur)) {
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if ((error = xfs_inobt_lshift(tcur, level, &i)))
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goto error0;
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if (i) {
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ASSERT(INT_GET(block->bb_numrecs, ARCH_CONVERT) >=
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XFS_INOBT_BLOCK_MINRECS(level, cur));
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xfs_btree_del_cursor(tcur,
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XFS_BTREE_NOERROR);
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if (level > 0 &&
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(error = xfs_inobt_decrement(cur, level,
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&i)))
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return error;
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*stat = 1;
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return 0;
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}
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}
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/*
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* Otherwise, grab the number of records in right for
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* future reference, and fix up the temp cursor to point
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* to our block again (last record).
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*/
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rrecs = INT_GET(right->bb_numrecs, ARCH_CONVERT);
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if (lbno != NULLAGBLOCK) {
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xfs_btree_firstrec(tcur, level);
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if ((error = xfs_inobt_decrement(tcur, level, &i)))
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goto error0;
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}
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}
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/*
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* If there's a left sibling, see if it's ok to shift an entry
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* out of it.
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*/
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if (lbno != NULLAGBLOCK) {
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/*
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* Move the temp cursor to the first entry in the
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* previous block.
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*/
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xfs_btree_firstrec(tcur, level);
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if ((error = xfs_inobt_decrement(tcur, level, &i)))
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goto error0;
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xfs_btree_firstrec(tcur, level);
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/*
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* Grab a pointer to the block.
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*/
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lbp = tcur->bc_bufs[level];
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left = XFS_BUF_TO_INOBT_BLOCK(lbp);
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#ifdef DEBUG
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if ((error = xfs_btree_check_sblock(cur, left, level, lbp)))
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goto error0;
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#endif
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/*
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* Grab the current block number, for future use.
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*/
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bno = INT_GET(left->bb_rightsib, ARCH_CONVERT);
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/*
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* If left block is full enough so that removing one entry
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* won't make it too empty, and right-shifting an entry out
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* of left to us works, we're done.
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*/
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if (INT_GET(left->bb_numrecs, ARCH_CONVERT) - 1 >=
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XFS_INOBT_BLOCK_MINRECS(level, cur)) {
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if ((error = xfs_inobt_rshift(tcur, level, &i)))
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goto error0;
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if (i) {
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ASSERT(INT_GET(block->bb_numrecs, ARCH_CONVERT) >=
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XFS_INOBT_BLOCK_MINRECS(level, cur));
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xfs_btree_del_cursor(tcur,
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XFS_BTREE_NOERROR);
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if (level == 0)
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cur->bc_ptrs[0]++;
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*stat = 1;
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return 0;
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}
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}
|
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/*
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* Otherwise, grab the number of records in right for
|
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* future reference.
|
|
*/
|
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lrecs = INT_GET(left->bb_numrecs, ARCH_CONVERT);
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}
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/*
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* Delete the temp cursor, we're done with it.
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*/
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xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
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/*
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* If here, we need to do a join to keep the tree balanced.
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*/
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ASSERT(bno != NULLAGBLOCK);
|
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/*
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* See if we can join with the left neighbor block.
|
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*/
|
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if (lbno != NULLAGBLOCK &&
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lrecs + numrecs <= XFS_INOBT_BLOCK_MAXRECS(level, cur)) {
|
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/*
|
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* Set "right" to be the starting block,
|
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* "left" to be the left neighbor.
|
|
*/
|
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rbno = bno;
|
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right = block;
|
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rrecs = INT_GET(right->bb_numrecs, ARCH_CONVERT);
|
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rbp = bp;
|
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if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
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cur->bc_private.i.agno, lbno, 0, &lbp,
|
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XFS_INO_BTREE_REF)))
|
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return error;
|
|
left = XFS_BUF_TO_INOBT_BLOCK(lbp);
|
|
lrecs = INT_GET(left->bb_numrecs, ARCH_CONVERT);
|
|
if ((error = xfs_btree_check_sblock(cur, left, level, lbp)))
|
|
return error;
|
|
}
|
|
/*
|
|
* If that won't work, see if we can join with the right neighbor block.
|
|
*/
|
|
else if (rbno != NULLAGBLOCK &&
|
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rrecs + numrecs <= XFS_INOBT_BLOCK_MAXRECS(level, cur)) {
|
|
/*
|
|
* Set "left" to be the starting block,
|
|
* "right" to be the right neighbor.
|
|
*/
|
|
lbno = bno;
|
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left = block;
|
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lrecs = INT_GET(left->bb_numrecs, ARCH_CONVERT);
|
|
lbp = bp;
|
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if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
|
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cur->bc_private.i.agno, rbno, 0, &rbp,
|
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XFS_INO_BTREE_REF)))
|
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return error;
|
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right = XFS_BUF_TO_INOBT_BLOCK(rbp);
|
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rrecs = INT_GET(right->bb_numrecs, ARCH_CONVERT);
|
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if ((error = xfs_btree_check_sblock(cur, right, level, rbp)))
|
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return error;
|
|
}
|
|
/*
|
|
* Otherwise, we can't fix the imbalance.
|
|
* Just return. This is probably a logic error, but it's not fatal.
|
|
*/
|
|
else {
|
|
if (level > 0 && (error = xfs_inobt_decrement(cur, level, &i)))
|
|
return error;
|
|
*stat = 1;
|
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return 0;
|
|
}
|
|
/*
|
|
* We're now going to join "left" and "right" by moving all the stuff
|
|
* in "right" to "left" and deleting "right".
|
|
*/
|
|
if (level > 0) {
|
|
/*
|
|
* It's a non-leaf. Move keys and pointers.
|
|
*/
|
|
lkp = XFS_INOBT_KEY_ADDR(left, lrecs + 1, cur);
|
|
lpp = XFS_INOBT_PTR_ADDR(left, lrecs + 1, cur);
|
|
rkp = XFS_INOBT_KEY_ADDR(right, 1, cur);
|
|
rpp = XFS_INOBT_PTR_ADDR(right, 1, cur);
|
|
#ifdef DEBUG
|
|
for (i = 0; i < rrecs; i++) {
|
|
if ((error = xfs_btree_check_sptr(cur, INT_GET(rpp[i], ARCH_CONVERT), level)))
|
|
return error;
|
|
}
|
|
#endif
|
|
memcpy(lkp, rkp, rrecs * sizeof(*lkp));
|
|
memcpy(lpp, rpp, rrecs * sizeof(*lpp));
|
|
xfs_inobt_log_keys(cur, lbp, lrecs + 1, lrecs + rrecs);
|
|
xfs_inobt_log_ptrs(cur, lbp, lrecs + 1, lrecs + rrecs);
|
|
} else {
|
|
/*
|
|
* It's a leaf. Move records.
|
|
*/
|
|
lrp = XFS_INOBT_REC_ADDR(left, lrecs + 1, cur);
|
|
rrp = XFS_INOBT_REC_ADDR(right, 1, cur);
|
|
memcpy(lrp, rrp, rrecs * sizeof(*lrp));
|
|
xfs_inobt_log_recs(cur, lbp, lrecs + 1, lrecs + rrecs);
|
|
}
|
|
/*
|
|
* If we joined with the left neighbor, set the buffer in the
|
|
* cursor to the left block, and fix up the index.
|
|
*/
|
|
if (bp != lbp) {
|
|
xfs_btree_setbuf(cur, level, lbp);
|
|
cur->bc_ptrs[level] += lrecs;
|
|
}
|
|
/*
|
|
* If we joined with the right neighbor and there's a level above
|
|
* us, increment the cursor at that level.
|
|
*/
|
|
else if (level + 1 < cur->bc_nlevels &&
|
|
(error = xfs_alloc_increment(cur, level + 1, &i)))
|
|
return error;
|
|
/*
|
|
* Fix up the number of records in the surviving block.
|
|
*/
|
|
lrecs += rrecs;
|
|
INT_SET(left->bb_numrecs, ARCH_CONVERT, lrecs);
|
|
/*
|
|
* Fix up the right block pointer in the surviving block, and log it.
|
|
*/
|
|
left->bb_rightsib = right->bb_rightsib;
|
|
xfs_inobt_log_block(cur->bc_tp, lbp, XFS_BB_NUMRECS | XFS_BB_RIGHTSIB);
|
|
/*
|
|
* If there is a right sibling now, make it point to the
|
|
* remaining block.
|
|
*/
|
|
if (INT_GET(left->bb_rightsib, ARCH_CONVERT) != NULLAGBLOCK) {
|
|
xfs_inobt_block_t *rrblock;
|
|
xfs_buf_t *rrbp;
|
|
|
|
if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
|
|
cur->bc_private.i.agno, INT_GET(left->bb_rightsib, ARCH_CONVERT), 0,
|
|
&rrbp, XFS_INO_BTREE_REF)))
|
|
return error;
|
|
rrblock = XFS_BUF_TO_INOBT_BLOCK(rrbp);
|
|
if ((error = xfs_btree_check_sblock(cur, rrblock, level, rrbp)))
|
|
return error;
|
|
INT_SET(rrblock->bb_leftsib, ARCH_CONVERT, lbno);
|
|
xfs_inobt_log_block(cur->bc_tp, rrbp, XFS_BB_LEFTSIB);
|
|
}
|
|
/*
|
|
* Free the deleting block.
|
|
*/
|
|
if ((error = xfs_free_extent(cur->bc_tp, XFS_AGB_TO_FSB(mp,
|
|
cur->bc_private.i.agno, rbno), 1)))
|
|
return error;
|
|
xfs_trans_binval(cur->bc_tp, rbp);
|
|
/*
|
|
* Readjust the ptr at this level if it's not a leaf, since it's
|
|
* still pointing at the deletion point, which makes the cursor
|
|
* inconsistent. If this makes the ptr 0, the caller fixes it up.
|
|
* We can't use decrement because it would change the next level up.
|
|
*/
|
|
if (level > 0)
|
|
cur->bc_ptrs[level]--;
|
|
/*
|
|
* Return value means the next level up has something to do.
|
|
*/
|
|
*stat = 2;
|
|
return 0;
|
|
|
|
error0:
|
|
xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Insert one record/level. Return information to the caller
|
|
* allowing the next level up to proceed if necessary.
|
|
*/
|
|
STATIC int /* error */
|
|
xfs_inobt_insrec(
|
|
xfs_btree_cur_t *cur, /* btree cursor */
|
|
int level, /* level to insert record at */
|
|
xfs_agblock_t *bnop, /* i/o: block number inserted */
|
|
xfs_inobt_rec_t *recp, /* i/o: record data inserted */
|
|
xfs_btree_cur_t **curp, /* output: new cursor replacing cur */
|
|
int *stat) /* success/failure */
|
|
{
|
|
xfs_inobt_block_t *block; /* btree block record/key lives in */
|
|
xfs_buf_t *bp; /* buffer for block */
|
|
int error; /* error return value */
|
|
int i; /* loop index */
|
|
xfs_inobt_key_t key; /* key value being inserted */
|
|
xfs_inobt_key_t *kp=NULL; /* pointer to btree keys */
|
|
xfs_agblock_t nbno; /* block number of allocated block */
|
|
xfs_btree_cur_t *ncur; /* new cursor to be used at next lvl */
|
|
xfs_inobt_key_t nkey; /* new key value, from split */
|
|
xfs_inobt_rec_t nrec; /* new record value, for caller */
|
|
int numrecs;
|
|
int optr; /* old ptr value */
|
|
xfs_inobt_ptr_t *pp; /* pointer to btree addresses */
|
|
int ptr; /* index in btree block for this rec */
|
|
xfs_inobt_rec_t *rp=NULL; /* pointer to btree records */
|
|
|
|
/*
|
|
* If we made it to the root level, allocate a new root block
|
|
* and we're done.
|
|
*/
|
|
if (level >= cur->bc_nlevels) {
|
|
error = xfs_inobt_newroot(cur, &i);
|
|
*bnop = NULLAGBLOCK;
|
|
*stat = i;
|
|
return error;
|
|
}
|
|
/*
|
|
* Make a key out of the record data to be inserted, and save it.
|
|
*/
|
|
key.ir_startino = recp->ir_startino; /* INT_: direct copy */
|
|
optr = ptr = cur->bc_ptrs[level];
|
|
/*
|
|
* If we're off the left edge, return failure.
|
|
*/
|
|
if (ptr == 0) {
|
|
*stat = 0;
|
|
return 0;
|
|
}
|
|
/*
|
|
* Get pointers to the btree buffer and block.
|
|
*/
|
|
bp = cur->bc_bufs[level];
|
|
block = XFS_BUF_TO_INOBT_BLOCK(bp);
|
|
numrecs = INT_GET(block->bb_numrecs, ARCH_CONVERT);
|
|
#ifdef DEBUG
|
|
if ((error = xfs_btree_check_sblock(cur, block, level, bp)))
|
|
return error;
|
|
/*
|
|
* Check that the new entry is being inserted in the right place.
|
|
*/
|
|
if (ptr <= numrecs) {
|
|
if (level == 0) {
|
|
rp = XFS_INOBT_REC_ADDR(block, ptr, cur);
|
|
xfs_btree_check_rec(cur->bc_btnum, recp, rp);
|
|
} else {
|
|
kp = XFS_INOBT_KEY_ADDR(block, ptr, cur);
|
|
xfs_btree_check_key(cur->bc_btnum, &key, kp);
|
|
}
|
|
}
|
|
#endif
|
|
nbno = NULLAGBLOCK;
|
|
ncur = (xfs_btree_cur_t *)0;
|
|
/*
|
|
* If the block is full, we can't insert the new entry until we
|
|
* make the block un-full.
|
|
*/
|
|
if (numrecs == XFS_INOBT_BLOCK_MAXRECS(level, cur)) {
|
|
/*
|
|
* First, try shifting an entry to the right neighbor.
|
|
*/
|
|
if ((error = xfs_inobt_rshift(cur, level, &i)))
|
|
return error;
|
|
if (i) {
|
|
/* nothing */
|
|
}
|
|
/*
|
|
* Next, try shifting an entry to the left neighbor.
|
|
*/
|
|
else {
|
|
if ((error = xfs_inobt_lshift(cur, level, &i)))
|
|
return error;
|
|
if (i) {
|
|
optr = ptr = cur->bc_ptrs[level];
|
|
} else {
|
|
/*
|
|
* Next, try splitting the current block
|
|
* in half. If this works we have to
|
|
* re-set our variables because
|
|
* we could be in a different block now.
|
|
*/
|
|
if ((error = xfs_inobt_split(cur, level, &nbno,
|
|
&nkey, &ncur, &i)))
|
|
return error;
|
|
if (i) {
|
|
bp = cur->bc_bufs[level];
|
|
block = XFS_BUF_TO_INOBT_BLOCK(bp);
|
|
#ifdef DEBUG
|
|
if ((error = xfs_btree_check_sblock(cur,
|
|
block, level, bp)))
|
|
return error;
|
|
#endif
|
|
ptr = cur->bc_ptrs[level];
|
|
nrec.ir_startino = nkey.ir_startino; /* INT_: direct copy */
|
|
} else {
|
|
/*
|
|
* Otherwise the insert fails.
|
|
*/
|
|
*stat = 0;
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
/*
|
|
* At this point we know there's room for our new entry in the block
|
|
* we're pointing at.
|
|
*/
|
|
numrecs = INT_GET(block->bb_numrecs, ARCH_CONVERT);
|
|
if (level > 0) {
|
|
/*
|
|
* It's a non-leaf entry. Make a hole for the new data
|
|
* in the key and ptr regions of the block.
|
|
*/
|
|
kp = XFS_INOBT_KEY_ADDR(block, 1, cur);
|
|
pp = XFS_INOBT_PTR_ADDR(block, 1, cur);
|
|
#ifdef DEBUG
|
|
for (i = numrecs; i >= ptr; i--) {
|
|
if ((error = xfs_btree_check_sptr(cur, INT_GET(pp[i - 1], ARCH_CONVERT), level)))
|
|
return error;
|
|
}
|
|
#endif
|
|
memmove(&kp[ptr], &kp[ptr - 1],
|
|
(numrecs - ptr + 1) * sizeof(*kp));
|
|
memmove(&pp[ptr], &pp[ptr - 1],
|
|
(numrecs - ptr + 1) * sizeof(*pp));
|
|
/*
|
|
* Now stuff the new data in, bump numrecs and log the new data.
|
|
*/
|
|
#ifdef DEBUG
|
|
if ((error = xfs_btree_check_sptr(cur, *bnop, level)))
|
|
return error;
|
|
#endif
|
|
kp[ptr - 1] = key; /* INT_: struct copy */
|
|
INT_SET(pp[ptr - 1], ARCH_CONVERT, *bnop);
|
|
numrecs++;
|
|
INT_SET(block->bb_numrecs, ARCH_CONVERT, numrecs);
|
|
xfs_inobt_log_keys(cur, bp, ptr, numrecs);
|
|
xfs_inobt_log_ptrs(cur, bp, ptr, numrecs);
|
|
} else {
|
|
/*
|
|
* It's a leaf entry. Make a hole for the new record.
|
|
*/
|
|
rp = XFS_INOBT_REC_ADDR(block, 1, cur);
|
|
memmove(&rp[ptr], &rp[ptr - 1],
|
|
(numrecs - ptr + 1) * sizeof(*rp));
|
|
/*
|
|
* Now stuff the new record in, bump numrecs
|
|
* and log the new data.
|
|
*/
|
|
rp[ptr - 1] = *recp; /* INT_: struct copy */
|
|
numrecs++;
|
|
INT_SET(block->bb_numrecs, ARCH_CONVERT, numrecs);
|
|
xfs_inobt_log_recs(cur, bp, ptr, numrecs);
|
|
}
|
|
/*
|
|
* Log the new number of records in the btree header.
|
|
*/
|
|
xfs_inobt_log_block(cur->bc_tp, bp, XFS_BB_NUMRECS);
|
|
#ifdef DEBUG
|
|
/*
|
|
* Check that the key/record is in the right place, now.
|
|
*/
|
|
if (ptr < numrecs) {
|
|
if (level == 0)
|
|
xfs_btree_check_rec(cur->bc_btnum, rp + ptr - 1,
|
|
rp + ptr);
|
|
else
|
|
xfs_btree_check_key(cur->bc_btnum, kp + ptr - 1,
|
|
kp + ptr);
|
|
}
|
|
#endif
|
|
/*
|
|
* If we inserted at the start of a block, update the parents' keys.
|
|
*/
|
|
if (optr == 1 && (error = xfs_inobt_updkey(cur, &key, level + 1)))
|
|
return error;
|
|
/*
|
|
* Return the new block number, if any.
|
|
* If there is one, give back a record value and a cursor too.
|
|
*/
|
|
*bnop = nbno;
|
|
if (nbno != NULLAGBLOCK) {
|
|
*recp = nrec; /* INT_: struct copy */
|
|
*curp = ncur;
|
|
}
|
|
*stat = 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Log header fields from a btree block.
|
|
*/
|
|
STATIC void
|
|
xfs_inobt_log_block(
|
|
xfs_trans_t *tp, /* transaction pointer */
|
|
xfs_buf_t *bp, /* buffer containing btree block */
|
|
int fields) /* mask of fields: XFS_BB_... */
|
|
{
|
|
int first; /* first byte offset logged */
|
|
int last; /* last byte offset logged */
|
|
static const short offsets[] = { /* table of offsets */
|
|
offsetof(xfs_inobt_block_t, bb_magic),
|
|
offsetof(xfs_inobt_block_t, bb_level),
|
|
offsetof(xfs_inobt_block_t, bb_numrecs),
|
|
offsetof(xfs_inobt_block_t, bb_leftsib),
|
|
offsetof(xfs_inobt_block_t, bb_rightsib),
|
|
sizeof(xfs_inobt_block_t)
|
|
};
|
|
|
|
xfs_btree_offsets(fields, offsets, XFS_BB_NUM_BITS, &first, &last);
|
|
xfs_trans_log_buf(tp, bp, first, last);
|
|
}
|
|
|
|
/*
|
|
* Log keys from a btree block (nonleaf).
|
|
*/
|
|
STATIC void
|
|
xfs_inobt_log_keys(
|
|
xfs_btree_cur_t *cur, /* btree cursor */
|
|
xfs_buf_t *bp, /* buffer containing btree block */
|
|
int kfirst, /* index of first key to log */
|
|
int klast) /* index of last key to log */
|
|
{
|
|
xfs_inobt_block_t *block; /* btree block to log from */
|
|
int first; /* first byte offset logged */
|
|
xfs_inobt_key_t *kp; /* key pointer in btree block */
|
|
int last; /* last byte offset logged */
|
|
|
|
block = XFS_BUF_TO_INOBT_BLOCK(bp);
|
|
kp = XFS_INOBT_KEY_ADDR(block, 1, cur);
|
|
first = (int)((xfs_caddr_t)&kp[kfirst - 1] - (xfs_caddr_t)block);
|
|
last = (int)(((xfs_caddr_t)&kp[klast] - 1) - (xfs_caddr_t)block);
|
|
xfs_trans_log_buf(cur->bc_tp, bp, first, last);
|
|
}
|
|
|
|
/*
|
|
* Log block pointer fields from a btree block (nonleaf).
|
|
*/
|
|
STATIC void
|
|
xfs_inobt_log_ptrs(
|
|
xfs_btree_cur_t *cur, /* btree cursor */
|
|
xfs_buf_t *bp, /* buffer containing btree block */
|
|
int pfirst, /* index of first pointer to log */
|
|
int plast) /* index of last pointer to log */
|
|
{
|
|
xfs_inobt_block_t *block; /* btree block to log from */
|
|
int first; /* first byte offset logged */
|
|
int last; /* last byte offset logged */
|
|
xfs_inobt_ptr_t *pp; /* block-pointer pointer in btree blk */
|
|
|
|
block = XFS_BUF_TO_INOBT_BLOCK(bp);
|
|
pp = XFS_INOBT_PTR_ADDR(block, 1, cur);
|
|
first = (int)((xfs_caddr_t)&pp[pfirst - 1] - (xfs_caddr_t)block);
|
|
last = (int)(((xfs_caddr_t)&pp[plast] - 1) - (xfs_caddr_t)block);
|
|
xfs_trans_log_buf(cur->bc_tp, bp, first, last);
|
|
}
|
|
|
|
/*
|
|
* Log records from a btree block (leaf).
|
|
*/
|
|
STATIC void
|
|
xfs_inobt_log_recs(
|
|
xfs_btree_cur_t *cur, /* btree cursor */
|
|
xfs_buf_t *bp, /* buffer containing btree block */
|
|
int rfirst, /* index of first record to log */
|
|
int rlast) /* index of last record to log */
|
|
{
|
|
xfs_inobt_block_t *block; /* btree block to log from */
|
|
int first; /* first byte offset logged */
|
|
int last; /* last byte offset logged */
|
|
xfs_inobt_rec_t *rp; /* record pointer for btree block */
|
|
|
|
block = XFS_BUF_TO_INOBT_BLOCK(bp);
|
|
rp = XFS_INOBT_REC_ADDR(block, 1, cur);
|
|
first = (int)((xfs_caddr_t)&rp[rfirst - 1] - (xfs_caddr_t)block);
|
|
last = (int)(((xfs_caddr_t)&rp[rlast] - 1) - (xfs_caddr_t)block);
|
|
xfs_trans_log_buf(cur->bc_tp, bp, first, last);
|
|
}
|
|
|
|
/*
|
|
* Lookup the record. The cursor is made to point to it, based on dir.
|
|
* Return 0 if can't find any such record, 1 for success.
|
|
*/
|
|
STATIC int /* error */
|
|
xfs_inobt_lookup(
|
|
xfs_btree_cur_t *cur, /* btree cursor */
|
|
xfs_lookup_t dir, /* <=, ==, or >= */
|
|
int *stat) /* success/failure */
|
|
{
|
|
xfs_agblock_t agbno; /* a.g. relative btree block number */
|
|
xfs_agnumber_t agno; /* allocation group number */
|
|
xfs_inobt_block_t *block=NULL; /* current btree block */
|
|
__int64_t diff; /* difference for the current key */
|
|
int error; /* error return value */
|
|
int keyno=0; /* current key number */
|
|
int level; /* level in the btree */
|
|
xfs_mount_t *mp; /* file system mount point */
|
|
|
|
/*
|
|
* Get the allocation group header, and the root block number.
|
|
*/
|
|
mp = cur->bc_mp;
|
|
{
|
|
xfs_agi_t *agi; /* a.g. inode header */
|
|
|
|
agi = XFS_BUF_TO_AGI(cur->bc_private.i.agbp);
|
|
agno = INT_GET(agi->agi_seqno, ARCH_CONVERT);
|
|
agbno = INT_GET(agi->agi_root, ARCH_CONVERT);
|
|
}
|
|
/*
|
|
* Iterate over each level in the btree, starting at the root.
|
|
* For each level above the leaves, find the key we need, based
|
|
* on the lookup record, then follow the corresponding block
|
|
* pointer down to the next level.
|
|
*/
|
|
for (level = cur->bc_nlevels - 1, diff = 1; level >= 0; level--) {
|
|
xfs_buf_t *bp; /* buffer pointer for btree block */
|
|
xfs_daddr_t d; /* disk address of btree block */
|
|
|
|
/*
|
|
* Get the disk address we're looking for.
|
|
*/
|
|
d = XFS_AGB_TO_DADDR(mp, agno, agbno);
|
|
/*
|
|
* If the old buffer at this level is for a different block,
|
|
* throw it away, otherwise just use it.
|
|
*/
|
|
bp = cur->bc_bufs[level];
|
|
if (bp && XFS_BUF_ADDR(bp) != d)
|
|
bp = (xfs_buf_t *)0;
|
|
if (!bp) {
|
|
/*
|
|
* Need to get a new buffer. Read it, then
|
|
* set it in the cursor, releasing the old one.
|
|
*/
|
|
if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
|
|
agno, agbno, 0, &bp, XFS_INO_BTREE_REF)))
|
|
return error;
|
|
xfs_btree_setbuf(cur, level, bp);
|
|
/*
|
|
* Point to the btree block, now that we have the buffer
|
|
*/
|
|
block = XFS_BUF_TO_INOBT_BLOCK(bp);
|
|
if ((error = xfs_btree_check_sblock(cur, block, level,
|
|
bp)))
|
|
return error;
|
|
} else
|
|
block = XFS_BUF_TO_INOBT_BLOCK(bp);
|
|
/*
|
|
* If we already had a key match at a higher level, we know
|
|
* we need to use the first entry in this block.
|
|
*/
|
|
if (diff == 0)
|
|
keyno = 1;
|
|
/*
|
|
* Otherwise we need to search this block. Do a binary search.
|
|
*/
|
|
else {
|
|
int high; /* high entry number */
|
|
xfs_inobt_key_t *kkbase=NULL;/* base of keys in block */
|
|
xfs_inobt_rec_t *krbase=NULL;/* base of records in block */
|
|
int low; /* low entry number */
|
|
|
|
/*
|
|
* Get a pointer to keys or records.
|
|
*/
|
|
if (level > 0)
|
|
kkbase = XFS_INOBT_KEY_ADDR(block, 1, cur);
|
|
else
|
|
krbase = XFS_INOBT_REC_ADDR(block, 1, cur);
|
|
/*
|
|
* Set low and high entry numbers, 1-based.
|
|
*/
|
|
low = 1;
|
|
if (!(high = INT_GET(block->bb_numrecs, ARCH_CONVERT))) {
|
|
/*
|
|
* If the block is empty, the tree must
|
|
* be an empty leaf.
|
|
*/
|
|
ASSERT(level == 0 && cur->bc_nlevels == 1);
|
|
cur->bc_ptrs[0] = dir != XFS_LOOKUP_LE;
|
|
*stat = 0;
|
|
return 0;
|
|
}
|
|
/*
|
|
* Binary search the block.
|
|
*/
|
|
while (low <= high) {
|
|
xfs_agino_t startino; /* key value */
|
|
|
|
/*
|
|
* keyno is average of low and high.
|
|
*/
|
|
keyno = (low + high) >> 1;
|
|
/*
|
|
* Get startino.
|
|
*/
|
|
if (level > 0) {
|
|
xfs_inobt_key_t *kkp;
|
|
|
|
kkp = kkbase + keyno - 1;
|
|
startino = INT_GET(kkp->ir_startino, ARCH_CONVERT);
|
|
} else {
|
|
xfs_inobt_rec_t *krp;
|
|
|
|
krp = krbase + keyno - 1;
|
|
startino = INT_GET(krp->ir_startino, ARCH_CONVERT);
|
|
}
|
|
/*
|
|
* Compute difference to get next direction.
|
|
*/
|
|
diff = (__int64_t)
|
|
startino - cur->bc_rec.i.ir_startino;
|
|
/*
|
|
* Less than, move right.
|
|
*/
|
|
if (diff < 0)
|
|
low = keyno + 1;
|
|
/*
|
|
* Greater than, move left.
|
|
*/
|
|
else if (diff > 0)
|
|
high = keyno - 1;
|
|
/*
|
|
* Equal, we're done.
|
|
*/
|
|
else
|
|
break;
|
|
}
|
|
}
|
|
/*
|
|
* If there are more levels, set up for the next level
|
|
* by getting the block number and filling in the cursor.
|
|
*/
|
|
if (level > 0) {
|
|
/*
|
|
* If we moved left, need the previous key number,
|
|
* unless there isn't one.
|
|
*/
|
|
if (diff > 0 && --keyno < 1)
|
|
keyno = 1;
|
|
agbno = INT_GET(*XFS_INOBT_PTR_ADDR(block, keyno, cur), ARCH_CONVERT);
|
|
#ifdef DEBUG
|
|
if ((error = xfs_btree_check_sptr(cur, agbno, level)))
|
|
return error;
|
|
#endif
|
|
cur->bc_ptrs[level] = keyno;
|
|
}
|
|
}
|
|
/*
|
|
* Done with the search.
|
|
* See if we need to adjust the results.
|
|
*/
|
|
if (dir != XFS_LOOKUP_LE && diff < 0) {
|
|
keyno++;
|
|
/*
|
|
* If ge search and we went off the end of the block, but it's
|
|
* not the last block, we're in the wrong block.
|
|
*/
|
|
if (dir == XFS_LOOKUP_GE &&
|
|
keyno > INT_GET(block->bb_numrecs, ARCH_CONVERT) &&
|
|
INT_GET(block->bb_rightsib, ARCH_CONVERT) != NULLAGBLOCK) {
|
|
int i;
|
|
|
|
cur->bc_ptrs[0] = keyno;
|
|
if ((error = xfs_inobt_increment(cur, 0, &i)))
|
|
return error;
|
|
ASSERT(i == 1);
|
|
*stat = 1;
|
|
return 0;
|
|
}
|
|
}
|
|
else if (dir == XFS_LOOKUP_LE && diff > 0)
|
|
keyno--;
|
|
cur->bc_ptrs[0] = keyno;
|
|
/*
|
|
* Return if we succeeded or not.
|
|
*/
|
|
if (keyno == 0 || keyno > INT_GET(block->bb_numrecs, ARCH_CONVERT))
|
|
*stat = 0;
|
|
else
|
|
*stat = ((dir != XFS_LOOKUP_EQ) || (diff == 0));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Move 1 record left from cur/level if possible.
|
|
* Update cur to reflect the new path.
|
|
*/
|
|
STATIC int /* error */
|
|
xfs_inobt_lshift(
|
|
xfs_btree_cur_t *cur, /* btree cursor */
|
|
int level, /* level to shift record on */
|
|
int *stat) /* success/failure */
|
|
{
|
|
int error; /* error return value */
|
|
#ifdef DEBUG
|
|
int i; /* loop index */
|
|
#endif
|
|
xfs_inobt_key_t key; /* key value for leaf level upward */
|
|
xfs_buf_t *lbp; /* buffer for left neighbor block */
|
|
xfs_inobt_block_t *left; /* left neighbor btree block */
|
|
xfs_inobt_key_t *lkp=NULL; /* key pointer for left block */
|
|
xfs_inobt_ptr_t *lpp; /* address pointer for left block */
|
|
xfs_inobt_rec_t *lrp=NULL; /* record pointer for left block */
|
|
int nrec; /* new number of left block entries */
|
|
xfs_buf_t *rbp; /* buffer for right (current) block */
|
|
xfs_inobt_block_t *right; /* right (current) btree block */
|
|
xfs_inobt_key_t *rkp=NULL; /* key pointer for right block */
|
|
xfs_inobt_ptr_t *rpp=NULL; /* address pointer for right block */
|
|
xfs_inobt_rec_t *rrp=NULL; /* record pointer for right block */
|
|
|
|
/*
|
|
* Set up variables for this block as "right".
|
|
*/
|
|
rbp = cur->bc_bufs[level];
|
|
right = XFS_BUF_TO_INOBT_BLOCK(rbp);
|
|
#ifdef DEBUG
|
|
if ((error = xfs_btree_check_sblock(cur, right, level, rbp)))
|
|
return error;
|
|
#endif
|
|
/*
|
|
* If we've got no left sibling then we can't shift an entry left.
|
|
*/
|
|
if (INT_GET(right->bb_leftsib, ARCH_CONVERT) == NULLAGBLOCK) {
|
|
*stat = 0;
|
|
return 0;
|
|
}
|
|
/*
|
|
* If the cursor entry is the one that would be moved, don't
|
|
* do it... it's too complicated.
|
|
*/
|
|
if (cur->bc_ptrs[level] <= 1) {
|
|
*stat = 0;
|
|
return 0;
|
|
}
|
|
/*
|
|
* Set up the left neighbor as "left".
|
|
*/
|
|
if ((error = xfs_btree_read_bufs(cur->bc_mp, cur->bc_tp,
|
|
cur->bc_private.i.agno, INT_GET(right->bb_leftsib, ARCH_CONVERT), 0, &lbp,
|
|
XFS_INO_BTREE_REF)))
|
|
return error;
|
|
left = XFS_BUF_TO_INOBT_BLOCK(lbp);
|
|
if ((error = xfs_btree_check_sblock(cur, left, level, lbp)))
|
|
return error;
|
|
/*
|
|
* If it's full, it can't take another entry.
|
|
*/
|
|
if (INT_GET(left->bb_numrecs, ARCH_CONVERT) == XFS_INOBT_BLOCK_MAXRECS(level, cur)) {
|
|
*stat = 0;
|
|
return 0;
|
|
}
|
|
nrec = INT_GET(left->bb_numrecs, ARCH_CONVERT) + 1;
|
|
/*
|
|
* If non-leaf, copy a key and a ptr to the left block.
|
|
*/
|
|
if (level > 0) {
|
|
lkp = XFS_INOBT_KEY_ADDR(left, nrec, cur);
|
|
rkp = XFS_INOBT_KEY_ADDR(right, 1, cur);
|
|
*lkp = *rkp;
|
|
xfs_inobt_log_keys(cur, lbp, nrec, nrec);
|
|
lpp = XFS_INOBT_PTR_ADDR(left, nrec, cur);
|
|
rpp = XFS_INOBT_PTR_ADDR(right, 1, cur);
|
|
#ifdef DEBUG
|
|
if ((error = xfs_btree_check_sptr(cur, INT_GET(*rpp, ARCH_CONVERT), level)))
|
|
return error;
|
|
#endif
|
|
*lpp = *rpp; /* INT_: no-change copy */
|
|
xfs_inobt_log_ptrs(cur, lbp, nrec, nrec);
|
|
}
|
|
/*
|
|
* If leaf, copy a record to the left block.
|
|
*/
|
|
else {
|
|
lrp = XFS_INOBT_REC_ADDR(left, nrec, cur);
|
|
rrp = XFS_INOBT_REC_ADDR(right, 1, cur);
|
|
*lrp = *rrp;
|
|
xfs_inobt_log_recs(cur, lbp, nrec, nrec);
|
|
}
|
|
/*
|
|
* Bump and log left's numrecs, decrement and log right's numrecs.
|
|
*/
|
|
INT_MOD(left->bb_numrecs, ARCH_CONVERT, +1);
|
|
xfs_inobt_log_block(cur->bc_tp, lbp, XFS_BB_NUMRECS);
|
|
#ifdef DEBUG
|
|
if (level > 0)
|
|
xfs_btree_check_key(cur->bc_btnum, lkp - 1, lkp);
|
|
else
|
|
xfs_btree_check_rec(cur->bc_btnum, lrp - 1, lrp);
|
|
#endif
|
|
INT_MOD(right->bb_numrecs, ARCH_CONVERT, -1);
|
|
xfs_inobt_log_block(cur->bc_tp, rbp, XFS_BB_NUMRECS);
|
|
/*
|
|
* Slide the contents of right down one entry.
|
|
*/
|
|
if (level > 0) {
|
|
#ifdef DEBUG
|
|
for (i = 0; i < INT_GET(right->bb_numrecs, ARCH_CONVERT); i++) {
|
|
if ((error = xfs_btree_check_sptr(cur, INT_GET(rpp[i + 1], ARCH_CONVERT),
|
|
level)))
|
|
return error;
|
|
}
|
|
#endif
|
|
memmove(rkp, rkp + 1, INT_GET(right->bb_numrecs, ARCH_CONVERT) * sizeof(*rkp));
|
|
memmove(rpp, rpp + 1, INT_GET(right->bb_numrecs, ARCH_CONVERT) * sizeof(*rpp));
|
|
xfs_inobt_log_keys(cur, rbp, 1, INT_GET(right->bb_numrecs, ARCH_CONVERT));
|
|
xfs_inobt_log_ptrs(cur, rbp, 1, INT_GET(right->bb_numrecs, ARCH_CONVERT));
|
|
} else {
|
|
memmove(rrp, rrp + 1, INT_GET(right->bb_numrecs, ARCH_CONVERT) * sizeof(*rrp));
|
|
xfs_inobt_log_recs(cur, rbp, 1, INT_GET(right->bb_numrecs, ARCH_CONVERT));
|
|
key.ir_startino = rrp->ir_startino; /* INT_: direct copy */
|
|
rkp = &key;
|
|
}
|
|
/*
|
|
* Update the parent key values of right.
|
|
*/
|
|
if ((error = xfs_inobt_updkey(cur, rkp, level + 1)))
|
|
return error;
|
|
/*
|
|
* Slide the cursor value left one.
|
|
*/
|
|
cur->bc_ptrs[level]--;
|
|
*stat = 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Allocate a new root block, fill it in.
|
|
*/
|
|
STATIC int /* error */
|
|
xfs_inobt_newroot(
|
|
xfs_btree_cur_t *cur, /* btree cursor */
|
|
int *stat) /* success/failure */
|
|
{
|
|
xfs_agi_t *agi; /* a.g. inode header */
|
|
xfs_alloc_arg_t args; /* allocation argument structure */
|
|
xfs_inobt_block_t *block; /* one half of the old root block */
|
|
xfs_buf_t *bp; /* buffer containing block */
|
|
int error; /* error return value */
|
|
xfs_inobt_key_t *kp; /* btree key pointer */
|
|
xfs_agblock_t lbno; /* left block number */
|
|
xfs_buf_t *lbp; /* left buffer pointer */
|
|
xfs_inobt_block_t *left; /* left btree block */
|
|
xfs_buf_t *nbp; /* new (root) buffer */
|
|
xfs_inobt_block_t *new; /* new (root) btree block */
|
|
int nptr; /* new value for key index, 1 or 2 */
|
|
xfs_inobt_ptr_t *pp; /* btree address pointer */
|
|
xfs_agblock_t rbno; /* right block number */
|
|
xfs_buf_t *rbp; /* right buffer pointer */
|
|
xfs_inobt_block_t *right; /* right btree block */
|
|
xfs_inobt_rec_t *rp; /* btree record pointer */
|
|
|
|
ASSERT(cur->bc_nlevels < XFS_IN_MAXLEVELS(cur->bc_mp));
|
|
|
|
/*
|
|
* Get a block & a buffer.
|
|
*/
|
|
agi = XFS_BUF_TO_AGI(cur->bc_private.i.agbp);
|
|
args.tp = cur->bc_tp;
|
|
args.mp = cur->bc_mp;
|
|
args.fsbno = XFS_AGB_TO_FSB(args.mp, cur->bc_private.i.agno,
|
|
INT_GET(agi->agi_root, ARCH_CONVERT));
|
|
args.mod = args.minleft = args.alignment = args.total = args.wasdel =
|
|
args.isfl = args.userdata = args.minalignslop = 0;
|
|
args.minlen = args.maxlen = args.prod = 1;
|
|
args.type = XFS_ALLOCTYPE_NEAR_BNO;
|
|
if ((error = xfs_alloc_vextent(&args)))
|
|
return error;
|
|
/*
|
|
* None available, we fail.
|
|
*/
|
|
if (args.fsbno == NULLFSBLOCK) {
|
|
*stat = 0;
|
|
return 0;
|
|
}
|
|
ASSERT(args.len == 1);
|
|
nbp = xfs_btree_get_bufs(args.mp, args.tp, args.agno, args.agbno, 0);
|
|
new = XFS_BUF_TO_INOBT_BLOCK(nbp);
|
|
/*
|
|
* Set the root data in the a.g. inode structure.
|
|
*/
|
|
INT_SET(agi->agi_root, ARCH_CONVERT, args.agbno);
|
|
INT_MOD(agi->agi_level, ARCH_CONVERT, 1);
|
|
xfs_ialloc_log_agi(args.tp, cur->bc_private.i.agbp,
|
|
XFS_AGI_ROOT | XFS_AGI_LEVEL);
|
|
/*
|
|
* At the previous root level there are now two blocks: the old
|
|
* root, and the new block generated when it was split.
|
|
* We don't know which one the cursor is pointing at, so we
|
|
* set up variables "left" and "right" for each case.
|
|
*/
|
|
bp = cur->bc_bufs[cur->bc_nlevels - 1];
|
|
block = XFS_BUF_TO_INOBT_BLOCK(bp);
|
|
#ifdef DEBUG
|
|
if ((error = xfs_btree_check_sblock(cur, block, cur->bc_nlevels - 1, bp)))
|
|
return error;
|
|
#endif
|
|
if (INT_GET(block->bb_rightsib, ARCH_CONVERT) != NULLAGBLOCK) {
|
|
/*
|
|
* Our block is left, pick up the right block.
|
|
*/
|
|
lbp = bp;
|
|
lbno = XFS_DADDR_TO_AGBNO(args.mp, XFS_BUF_ADDR(lbp));
|
|
left = block;
|
|
rbno = INT_GET(left->bb_rightsib, ARCH_CONVERT);
|
|
if ((error = xfs_btree_read_bufs(args.mp, args.tp, args.agno,
|
|
rbno, 0, &rbp, XFS_INO_BTREE_REF)))
|
|
return error;
|
|
bp = rbp;
|
|
right = XFS_BUF_TO_INOBT_BLOCK(rbp);
|
|
if ((error = xfs_btree_check_sblock(cur, right,
|
|
cur->bc_nlevels - 1, rbp)))
|
|
return error;
|
|
nptr = 1;
|
|
} else {
|
|
/*
|
|
* Our block is right, pick up the left block.
|
|
*/
|
|
rbp = bp;
|
|
rbno = XFS_DADDR_TO_AGBNO(args.mp, XFS_BUF_ADDR(rbp));
|
|
right = block;
|
|
lbno = INT_GET(right->bb_leftsib, ARCH_CONVERT);
|
|
if ((error = xfs_btree_read_bufs(args.mp, args.tp, args.agno,
|
|
lbno, 0, &lbp, XFS_INO_BTREE_REF)))
|
|
return error;
|
|
bp = lbp;
|
|
left = XFS_BUF_TO_INOBT_BLOCK(lbp);
|
|
if ((error = xfs_btree_check_sblock(cur, left,
|
|
cur->bc_nlevels - 1, lbp)))
|
|
return error;
|
|
nptr = 2;
|
|
}
|
|
/*
|
|
* Fill in the new block's btree header and log it.
|
|
*/
|
|
INT_SET(new->bb_magic, ARCH_CONVERT, xfs_magics[cur->bc_btnum]);
|
|
INT_SET(new->bb_level, ARCH_CONVERT, (__uint16_t)cur->bc_nlevels);
|
|
INT_SET(new->bb_numrecs, ARCH_CONVERT, 2);
|
|
INT_SET(new->bb_leftsib, ARCH_CONVERT, NULLAGBLOCK);
|
|
INT_SET(new->bb_rightsib, ARCH_CONVERT, NULLAGBLOCK);
|
|
xfs_inobt_log_block(args.tp, nbp, XFS_BB_ALL_BITS);
|
|
ASSERT(lbno != NULLAGBLOCK && rbno != NULLAGBLOCK);
|
|
/*
|
|
* Fill in the key data in the new root.
|
|
*/
|
|
kp = XFS_INOBT_KEY_ADDR(new, 1, cur);
|
|
if (INT_GET(left->bb_level, ARCH_CONVERT) > 0) {
|
|
kp[0] = *XFS_INOBT_KEY_ADDR(left, 1, cur); /* INT_: struct copy */
|
|
kp[1] = *XFS_INOBT_KEY_ADDR(right, 1, cur); /* INT_: struct copy */
|
|
} else {
|
|
rp = XFS_INOBT_REC_ADDR(left, 1, cur);
|
|
INT_COPY(kp[0].ir_startino, rp->ir_startino, ARCH_CONVERT);
|
|
rp = XFS_INOBT_REC_ADDR(right, 1, cur);
|
|
INT_COPY(kp[1].ir_startino, rp->ir_startino, ARCH_CONVERT);
|
|
}
|
|
xfs_inobt_log_keys(cur, nbp, 1, 2);
|
|
/*
|
|
* Fill in the pointer data in the new root.
|
|
*/
|
|
pp = XFS_INOBT_PTR_ADDR(new, 1, cur);
|
|
INT_SET(pp[0], ARCH_CONVERT, lbno);
|
|
INT_SET(pp[1], ARCH_CONVERT, rbno);
|
|
xfs_inobt_log_ptrs(cur, nbp, 1, 2);
|
|
/*
|
|
* Fix up the cursor.
|
|
*/
|
|
xfs_btree_setbuf(cur, cur->bc_nlevels, nbp);
|
|
cur->bc_ptrs[cur->bc_nlevels] = nptr;
|
|
cur->bc_nlevels++;
|
|
*stat = 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Move 1 record right from cur/level if possible.
|
|
* Update cur to reflect the new path.
|
|
*/
|
|
STATIC int /* error */
|
|
xfs_inobt_rshift(
|
|
xfs_btree_cur_t *cur, /* btree cursor */
|
|
int level, /* level to shift record on */
|
|
int *stat) /* success/failure */
|
|
{
|
|
int error; /* error return value */
|
|
int i; /* loop index */
|
|
xfs_inobt_key_t key; /* key value for leaf level upward */
|
|
xfs_buf_t *lbp; /* buffer for left (current) block */
|
|
xfs_inobt_block_t *left; /* left (current) btree block */
|
|
xfs_inobt_key_t *lkp; /* key pointer for left block */
|
|
xfs_inobt_ptr_t *lpp; /* address pointer for left block */
|
|
xfs_inobt_rec_t *lrp; /* record pointer for left block */
|
|
xfs_buf_t *rbp; /* buffer for right neighbor block */
|
|
xfs_inobt_block_t *right; /* right neighbor btree block */
|
|
xfs_inobt_key_t *rkp; /* key pointer for right block */
|
|
xfs_inobt_ptr_t *rpp; /* address pointer for right block */
|
|
xfs_inobt_rec_t *rrp=NULL; /* record pointer for right block */
|
|
xfs_btree_cur_t *tcur; /* temporary cursor */
|
|
|
|
/*
|
|
* Set up variables for this block as "left".
|
|
*/
|
|
lbp = cur->bc_bufs[level];
|
|
left = XFS_BUF_TO_INOBT_BLOCK(lbp);
|
|
#ifdef DEBUG
|
|
if ((error = xfs_btree_check_sblock(cur, left, level, lbp)))
|
|
return error;
|
|
#endif
|
|
/*
|
|
* If we've got no right sibling then we can't shift an entry right.
|
|
*/
|
|
if (INT_GET(left->bb_rightsib, ARCH_CONVERT) == NULLAGBLOCK) {
|
|
*stat = 0;
|
|
return 0;
|
|
}
|
|
/*
|
|
* If the cursor entry is the one that would be moved, don't
|
|
* do it... it's too complicated.
|
|
*/
|
|
if (cur->bc_ptrs[level] >= INT_GET(left->bb_numrecs, ARCH_CONVERT)) {
|
|
*stat = 0;
|
|
return 0;
|
|
}
|
|
/*
|
|
* Set up the right neighbor as "right".
|
|
*/
|
|
if ((error = xfs_btree_read_bufs(cur->bc_mp, cur->bc_tp,
|
|
cur->bc_private.i.agno, INT_GET(left->bb_rightsib, ARCH_CONVERT), 0, &rbp,
|
|
XFS_INO_BTREE_REF)))
|
|
return error;
|
|
right = XFS_BUF_TO_INOBT_BLOCK(rbp);
|
|
if ((error = xfs_btree_check_sblock(cur, right, level, rbp)))
|
|
return error;
|
|
/*
|
|
* If it's full, it can't take another entry.
|
|
*/
|
|
if (INT_GET(right->bb_numrecs, ARCH_CONVERT) == XFS_INOBT_BLOCK_MAXRECS(level, cur)) {
|
|
*stat = 0;
|
|
return 0;
|
|
}
|
|
/*
|
|
* Make a hole at the start of the right neighbor block, then
|
|
* copy the last left block entry to the hole.
|
|
*/
|
|
if (level > 0) {
|
|
lkp = XFS_INOBT_KEY_ADDR(left, INT_GET(left->bb_numrecs, ARCH_CONVERT), cur);
|
|
lpp = XFS_INOBT_PTR_ADDR(left, INT_GET(left->bb_numrecs, ARCH_CONVERT), cur);
|
|
rkp = XFS_INOBT_KEY_ADDR(right, 1, cur);
|
|
rpp = XFS_INOBT_PTR_ADDR(right, 1, cur);
|
|
#ifdef DEBUG
|
|
for (i = INT_GET(right->bb_numrecs, ARCH_CONVERT) - 1; i >= 0; i--) {
|
|
if ((error = xfs_btree_check_sptr(cur, INT_GET(rpp[i], ARCH_CONVERT), level)))
|
|
return error;
|
|
}
|
|
#endif
|
|
memmove(rkp + 1, rkp, INT_GET(right->bb_numrecs, ARCH_CONVERT) * sizeof(*rkp));
|
|
memmove(rpp + 1, rpp, INT_GET(right->bb_numrecs, ARCH_CONVERT) * sizeof(*rpp));
|
|
#ifdef DEBUG
|
|
if ((error = xfs_btree_check_sptr(cur, INT_GET(*lpp, ARCH_CONVERT), level)))
|
|
return error;
|
|
#endif
|
|
*rkp = *lkp; /* INT_: no change copy */
|
|
*rpp = *lpp; /* INT_: no change copy */
|
|
xfs_inobt_log_keys(cur, rbp, 1, INT_GET(right->bb_numrecs, ARCH_CONVERT) + 1);
|
|
xfs_inobt_log_ptrs(cur, rbp, 1, INT_GET(right->bb_numrecs, ARCH_CONVERT) + 1);
|
|
} else {
|
|
lrp = XFS_INOBT_REC_ADDR(left, INT_GET(left->bb_numrecs, ARCH_CONVERT), cur);
|
|
rrp = XFS_INOBT_REC_ADDR(right, 1, cur);
|
|
memmove(rrp + 1, rrp, INT_GET(right->bb_numrecs, ARCH_CONVERT) * sizeof(*rrp));
|
|
*rrp = *lrp;
|
|
xfs_inobt_log_recs(cur, rbp, 1, INT_GET(right->bb_numrecs, ARCH_CONVERT) + 1);
|
|
key.ir_startino = rrp->ir_startino; /* INT_: direct copy */
|
|
rkp = &key;
|
|
}
|
|
/*
|
|
* Decrement and log left's numrecs, bump and log right's numrecs.
|
|
*/
|
|
INT_MOD(left->bb_numrecs, ARCH_CONVERT, -1);
|
|
xfs_inobt_log_block(cur->bc_tp, lbp, XFS_BB_NUMRECS);
|
|
INT_MOD(right->bb_numrecs, ARCH_CONVERT, +1);
|
|
#ifdef DEBUG
|
|
if (level > 0)
|
|
xfs_btree_check_key(cur->bc_btnum, rkp, rkp + 1);
|
|
else
|
|
xfs_btree_check_rec(cur->bc_btnum, rrp, rrp + 1);
|
|
#endif
|
|
xfs_inobt_log_block(cur->bc_tp, rbp, XFS_BB_NUMRECS);
|
|
/*
|
|
* Using a temporary cursor, update the parent key values of the
|
|
* block on the right.
|
|
*/
|
|
if ((error = xfs_btree_dup_cursor(cur, &tcur)))
|
|
return error;
|
|
xfs_btree_lastrec(tcur, level);
|
|
if ((error = xfs_inobt_increment(tcur, level, &i)) ||
|
|
(error = xfs_inobt_updkey(tcur, rkp, level + 1))) {
|
|
xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR);
|
|
return error;
|
|
}
|
|
xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
|
|
*stat = 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Split cur/level block in half.
|
|
* Return new block number and its first record (to be inserted into parent).
|
|
*/
|
|
STATIC int /* error */
|
|
xfs_inobt_split(
|
|
xfs_btree_cur_t *cur, /* btree cursor */
|
|
int level, /* level to split */
|
|
xfs_agblock_t *bnop, /* output: block number allocated */
|
|
xfs_inobt_key_t *keyp, /* output: first key of new block */
|
|
xfs_btree_cur_t **curp, /* output: new cursor */
|
|
int *stat) /* success/failure */
|
|
{
|
|
xfs_alloc_arg_t args; /* allocation argument structure */
|
|
int error; /* error return value */
|
|
int i; /* loop index/record number */
|
|
xfs_agblock_t lbno; /* left (current) block number */
|
|
xfs_buf_t *lbp; /* buffer for left block */
|
|
xfs_inobt_block_t *left; /* left (current) btree block */
|
|
xfs_inobt_key_t *lkp; /* left btree key pointer */
|
|
xfs_inobt_ptr_t *lpp; /* left btree address pointer */
|
|
xfs_inobt_rec_t *lrp; /* left btree record pointer */
|
|
xfs_buf_t *rbp; /* buffer for right block */
|
|
xfs_inobt_block_t *right; /* right (new) btree block */
|
|
xfs_inobt_key_t *rkp; /* right btree key pointer */
|
|
xfs_inobt_ptr_t *rpp; /* right btree address pointer */
|
|
xfs_inobt_rec_t *rrp; /* right btree record pointer */
|
|
|
|
/*
|
|
* Set up left block (current one).
|
|
*/
|
|
lbp = cur->bc_bufs[level];
|
|
args.tp = cur->bc_tp;
|
|
args.mp = cur->bc_mp;
|
|
lbno = XFS_DADDR_TO_AGBNO(args.mp, XFS_BUF_ADDR(lbp));
|
|
/*
|
|
* Allocate the new block.
|
|
* If we can't do it, we're toast. Give up.
|
|
*/
|
|
args.fsbno = XFS_AGB_TO_FSB(args.mp, cur->bc_private.i.agno, lbno);
|
|
args.mod = args.minleft = args.alignment = args.total = args.wasdel =
|
|
args.isfl = args.userdata = args.minalignslop = 0;
|
|
args.minlen = args.maxlen = args.prod = 1;
|
|
args.type = XFS_ALLOCTYPE_NEAR_BNO;
|
|
if ((error = xfs_alloc_vextent(&args)))
|
|
return error;
|
|
if (args.fsbno == NULLFSBLOCK) {
|
|
*stat = 0;
|
|
return 0;
|
|
}
|
|
ASSERT(args.len == 1);
|
|
rbp = xfs_btree_get_bufs(args.mp, args.tp, args.agno, args.agbno, 0);
|
|
/*
|
|
* Set up the new block as "right".
|
|
*/
|
|
right = XFS_BUF_TO_INOBT_BLOCK(rbp);
|
|
/*
|
|
* "Left" is the current (according to the cursor) block.
|
|
*/
|
|
left = XFS_BUF_TO_INOBT_BLOCK(lbp);
|
|
#ifdef DEBUG
|
|
if ((error = xfs_btree_check_sblock(cur, left, level, lbp)))
|
|
return error;
|
|
#endif
|
|
/*
|
|
* Fill in the btree header for the new block.
|
|
*/
|
|
INT_SET(right->bb_magic, ARCH_CONVERT, xfs_magics[cur->bc_btnum]);
|
|
right->bb_level = left->bb_level; /* INT_: direct copy */
|
|
INT_SET(right->bb_numrecs, ARCH_CONVERT, (__uint16_t)(INT_GET(left->bb_numrecs, ARCH_CONVERT) / 2));
|
|
/*
|
|
* Make sure that if there's an odd number of entries now, that
|
|
* each new block will have the same number of entries.
|
|
*/
|
|
if ((INT_GET(left->bb_numrecs, ARCH_CONVERT) & 1) &&
|
|
cur->bc_ptrs[level] <= INT_GET(right->bb_numrecs, ARCH_CONVERT) + 1)
|
|
INT_MOD(right->bb_numrecs, ARCH_CONVERT, +1);
|
|
i = INT_GET(left->bb_numrecs, ARCH_CONVERT) - INT_GET(right->bb_numrecs, ARCH_CONVERT) + 1;
|
|
/*
|
|
* For non-leaf blocks, copy keys and addresses over to the new block.
|
|
*/
|
|
if (level > 0) {
|
|
lkp = XFS_INOBT_KEY_ADDR(left, i, cur);
|
|
lpp = XFS_INOBT_PTR_ADDR(left, i, cur);
|
|
rkp = XFS_INOBT_KEY_ADDR(right, 1, cur);
|
|
rpp = XFS_INOBT_PTR_ADDR(right, 1, cur);
|
|
#ifdef DEBUG
|
|
for (i = 0; i < INT_GET(right->bb_numrecs, ARCH_CONVERT); i++) {
|
|
if ((error = xfs_btree_check_sptr(cur, INT_GET(lpp[i], ARCH_CONVERT), level)))
|
|
return error;
|
|
}
|
|
#endif
|
|
memcpy(rkp, lkp, INT_GET(right->bb_numrecs, ARCH_CONVERT) * sizeof(*rkp));
|
|
memcpy(rpp, lpp, INT_GET(right->bb_numrecs, ARCH_CONVERT) * sizeof(*rpp));
|
|
xfs_inobt_log_keys(cur, rbp, 1, INT_GET(right->bb_numrecs, ARCH_CONVERT));
|
|
xfs_inobt_log_ptrs(cur, rbp, 1, INT_GET(right->bb_numrecs, ARCH_CONVERT));
|
|
*keyp = *rkp;
|
|
}
|
|
/*
|
|
* For leaf blocks, copy records over to the new block.
|
|
*/
|
|
else {
|
|
lrp = XFS_INOBT_REC_ADDR(left, i, cur);
|
|
rrp = XFS_INOBT_REC_ADDR(right, 1, cur);
|
|
memcpy(rrp, lrp, INT_GET(right->bb_numrecs, ARCH_CONVERT) * sizeof(*rrp));
|
|
xfs_inobt_log_recs(cur, rbp, 1, INT_GET(right->bb_numrecs, ARCH_CONVERT));
|
|
keyp->ir_startino = rrp->ir_startino; /* INT_: direct copy */
|
|
}
|
|
/*
|
|
* Find the left block number by looking in the buffer.
|
|
* Adjust numrecs, sibling pointers.
|
|
*/
|
|
INT_MOD(left->bb_numrecs, ARCH_CONVERT, -(INT_GET(right->bb_numrecs, ARCH_CONVERT)));
|
|
right->bb_rightsib = left->bb_rightsib; /* INT_: direct copy */
|
|
INT_SET(left->bb_rightsib, ARCH_CONVERT, args.agbno);
|
|
INT_SET(right->bb_leftsib, ARCH_CONVERT, lbno);
|
|
xfs_inobt_log_block(args.tp, rbp, XFS_BB_ALL_BITS);
|
|
xfs_inobt_log_block(args.tp, lbp, XFS_BB_NUMRECS | XFS_BB_RIGHTSIB);
|
|
/*
|
|
* If there's a block to the new block's right, make that block
|
|
* point back to right instead of to left.
|
|
*/
|
|
if (INT_GET(right->bb_rightsib, ARCH_CONVERT) != NULLAGBLOCK) {
|
|
xfs_inobt_block_t *rrblock; /* rr btree block */
|
|
xfs_buf_t *rrbp; /* buffer for rrblock */
|
|
|
|
if ((error = xfs_btree_read_bufs(args.mp, args.tp, args.agno,
|
|
INT_GET(right->bb_rightsib, ARCH_CONVERT), 0, &rrbp,
|
|
XFS_INO_BTREE_REF)))
|
|
return error;
|
|
rrblock = XFS_BUF_TO_INOBT_BLOCK(rrbp);
|
|
if ((error = xfs_btree_check_sblock(cur, rrblock, level, rrbp)))
|
|
return error;
|
|
INT_SET(rrblock->bb_leftsib, ARCH_CONVERT, args.agbno);
|
|
xfs_inobt_log_block(args.tp, rrbp, XFS_BB_LEFTSIB);
|
|
}
|
|
/*
|
|
* If the cursor is really in the right block, move it there.
|
|
* If it's just pointing past the last entry in left, then we'll
|
|
* insert there, so don't change anything in that case.
|
|
*/
|
|
if (cur->bc_ptrs[level] > INT_GET(left->bb_numrecs, ARCH_CONVERT) + 1) {
|
|
xfs_btree_setbuf(cur, level, rbp);
|
|
cur->bc_ptrs[level] -= INT_GET(left->bb_numrecs, ARCH_CONVERT);
|
|
}
|
|
/*
|
|
* If there are more levels, we'll need another cursor which refers
|
|
* the right block, no matter where this cursor was.
|
|
*/
|
|
if (level + 1 < cur->bc_nlevels) {
|
|
if ((error = xfs_btree_dup_cursor(cur, curp)))
|
|
return error;
|
|
(*curp)->bc_ptrs[level + 1]++;
|
|
}
|
|
*bnop = args.agbno;
|
|
*stat = 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Update keys at all levels from here to the root along the cursor's path.
|
|
*/
|
|
STATIC int /* error */
|
|
xfs_inobt_updkey(
|
|
xfs_btree_cur_t *cur, /* btree cursor */
|
|
xfs_inobt_key_t *keyp, /* new key value to update to */
|
|
int level) /* starting level for update */
|
|
{
|
|
int ptr; /* index of key in block */
|
|
|
|
/*
|
|
* Go up the tree from this level toward the root.
|
|
* At each level, update the key value to the value input.
|
|
* Stop when we reach a level where the cursor isn't pointing
|
|
* at the first entry in the block.
|
|
*/
|
|
for (ptr = 1; ptr == 1 && level < cur->bc_nlevels; level++) {
|
|
xfs_buf_t *bp; /* buffer for block */
|
|
xfs_inobt_block_t *block; /* btree block */
|
|
#ifdef DEBUG
|
|
int error; /* error return value */
|
|
#endif
|
|
xfs_inobt_key_t *kp; /* ptr to btree block keys */
|
|
|
|
bp = cur->bc_bufs[level];
|
|
block = XFS_BUF_TO_INOBT_BLOCK(bp);
|
|
#ifdef DEBUG
|
|
if ((error = xfs_btree_check_sblock(cur, block, level, bp)))
|
|
return error;
|
|
#endif
|
|
ptr = cur->bc_ptrs[level];
|
|
kp = XFS_INOBT_KEY_ADDR(block, ptr, cur);
|
|
*kp = *keyp;
|
|
xfs_inobt_log_keys(cur, bp, ptr, ptr);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Externally visible routines.
|
|
*/
|
|
|
|
/*
|
|
* Decrement cursor by one record at the level.
|
|
* For nonzero levels the leaf-ward information is untouched.
|
|
*/
|
|
int /* error */
|
|
xfs_inobt_decrement(
|
|
xfs_btree_cur_t *cur, /* btree cursor */
|
|
int level, /* level in btree, 0 is leaf */
|
|
int *stat) /* success/failure */
|
|
{
|
|
xfs_inobt_block_t *block; /* btree block */
|
|
int error;
|
|
int lev; /* btree level */
|
|
|
|
ASSERT(level < cur->bc_nlevels);
|
|
/*
|
|
* Read-ahead to the left at this level.
|
|
*/
|
|
xfs_btree_readahead(cur, level, XFS_BTCUR_LEFTRA);
|
|
/*
|
|
* Decrement the ptr at this level. If we're still in the block
|
|
* then we're done.
|
|
*/
|
|
if (--cur->bc_ptrs[level] > 0) {
|
|
*stat = 1;
|
|
return 0;
|
|
}
|
|
/*
|
|
* Get a pointer to the btree block.
|
|
*/
|
|
block = XFS_BUF_TO_INOBT_BLOCK(cur->bc_bufs[level]);
|
|
#ifdef DEBUG
|
|
if ((error = xfs_btree_check_sblock(cur, block, level,
|
|
cur->bc_bufs[level])))
|
|
return error;
|
|
#endif
|
|
/*
|
|
* If we just went off the left edge of the tree, return failure.
|
|
*/
|
|
if (INT_GET(block->bb_leftsib, ARCH_CONVERT) == NULLAGBLOCK) {
|
|
*stat = 0;
|
|
return 0;
|
|
}
|
|
/*
|
|
* March up the tree decrementing pointers.
|
|
* Stop when we don't go off the left edge of a block.
|
|
*/
|
|
for (lev = level + 1; lev < cur->bc_nlevels; lev++) {
|
|
if (--cur->bc_ptrs[lev] > 0)
|
|
break;
|
|
/*
|
|
* Read-ahead the left block, we're going to read it
|
|
* in the next loop.
|
|
*/
|
|
xfs_btree_readahead(cur, lev, XFS_BTCUR_LEFTRA);
|
|
}
|
|
/*
|
|
* If we went off the root then we are seriously confused.
|
|
*/
|
|
ASSERT(lev < cur->bc_nlevels);
|
|
/*
|
|
* Now walk back down the tree, fixing up the cursor's buffer
|
|
* pointers and key numbers.
|
|
*/
|
|
for (block = XFS_BUF_TO_INOBT_BLOCK(cur->bc_bufs[lev]); lev > level; ) {
|
|
xfs_agblock_t agbno; /* block number of btree block */
|
|
xfs_buf_t *bp; /* buffer containing btree block */
|
|
|
|
agbno = INT_GET(*XFS_INOBT_PTR_ADDR(block, cur->bc_ptrs[lev], cur), ARCH_CONVERT);
|
|
if ((error = xfs_btree_read_bufs(cur->bc_mp, cur->bc_tp,
|
|
cur->bc_private.i.agno, agbno, 0, &bp,
|
|
XFS_INO_BTREE_REF)))
|
|
return error;
|
|
lev--;
|
|
xfs_btree_setbuf(cur, lev, bp);
|
|
block = XFS_BUF_TO_INOBT_BLOCK(bp);
|
|
if ((error = xfs_btree_check_sblock(cur, block, lev, bp)))
|
|
return error;
|
|
cur->bc_ptrs[lev] = INT_GET(block->bb_numrecs, ARCH_CONVERT);
|
|
}
|
|
*stat = 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Delete the record pointed to by cur.
|
|
* The cursor refers to the place where the record was (could be inserted)
|
|
* when the operation returns.
|
|
*/
|
|
int /* error */
|
|
xfs_inobt_delete(
|
|
xfs_btree_cur_t *cur, /* btree cursor */
|
|
int *stat) /* success/failure */
|
|
{
|
|
int error;
|
|
int i; /* result code */
|
|
int level; /* btree level */
|
|
|
|
/*
|
|
* Go up the tree, starting at leaf level.
|
|
* If 2 is returned then a join was done; go to the next level.
|
|
* Otherwise we are done.
|
|
*/
|
|
for (level = 0, i = 2; i == 2; level++) {
|
|
if ((error = xfs_inobt_delrec(cur, level, &i)))
|
|
return error;
|
|
}
|
|
if (i == 0) {
|
|
for (level = 1; level < cur->bc_nlevels; level++) {
|
|
if (cur->bc_ptrs[level] == 0) {
|
|
if ((error = xfs_inobt_decrement(cur, level, &i)))
|
|
return error;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
*stat = i;
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Get the data from the pointed-to record.
|
|
*/
|
|
int /* error */
|
|
xfs_inobt_get_rec(
|
|
xfs_btree_cur_t *cur, /* btree cursor */
|
|
xfs_agino_t *ino, /* output: starting inode of chunk */
|
|
__int32_t *fcnt, /* output: number of free inodes */
|
|
xfs_inofree_t *free, /* output: free inode mask */
|
|
int *stat) /* output: success/failure */
|
|
{
|
|
xfs_inobt_block_t *block; /* btree block */
|
|
xfs_buf_t *bp; /* buffer containing btree block */
|
|
#ifdef DEBUG
|
|
int error; /* error return value */
|
|
#endif
|
|
int ptr; /* record number */
|
|
xfs_inobt_rec_t *rec; /* record data */
|
|
|
|
bp = cur->bc_bufs[0];
|
|
ptr = cur->bc_ptrs[0];
|
|
block = XFS_BUF_TO_INOBT_BLOCK(bp);
|
|
#ifdef DEBUG
|
|
if ((error = xfs_btree_check_sblock(cur, block, 0, bp)))
|
|
return error;
|
|
#endif
|
|
/*
|
|
* Off the right end or left end, return failure.
|
|
*/
|
|
if (ptr > INT_GET(block->bb_numrecs, ARCH_CONVERT) || ptr <= 0) {
|
|
*stat = 0;
|
|
return 0;
|
|
}
|
|
/*
|
|
* Point to the record and extract its data.
|
|
*/
|
|
rec = XFS_INOBT_REC_ADDR(block, ptr, cur);
|
|
*ino = INT_GET(rec->ir_startino, ARCH_CONVERT);
|
|
*fcnt = INT_GET(rec->ir_freecount, ARCH_CONVERT);
|
|
*free = INT_GET(rec->ir_free, ARCH_CONVERT);
|
|
*stat = 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Increment cursor by one record at the level.
|
|
* For nonzero levels the leaf-ward information is untouched.
|
|
*/
|
|
int /* error */
|
|
xfs_inobt_increment(
|
|
xfs_btree_cur_t *cur, /* btree cursor */
|
|
int level, /* level in btree, 0 is leaf */
|
|
int *stat) /* success/failure */
|
|
{
|
|
xfs_inobt_block_t *block; /* btree block */
|
|
xfs_buf_t *bp; /* buffer containing btree block */
|
|
int error; /* error return value */
|
|
int lev; /* btree level */
|
|
|
|
ASSERT(level < cur->bc_nlevels);
|
|
/*
|
|
* Read-ahead to the right at this level.
|
|
*/
|
|
xfs_btree_readahead(cur, level, XFS_BTCUR_RIGHTRA);
|
|
/*
|
|
* Get a pointer to the btree block.
|
|
*/
|
|
bp = cur->bc_bufs[level];
|
|
block = XFS_BUF_TO_INOBT_BLOCK(bp);
|
|
#ifdef DEBUG
|
|
if ((error = xfs_btree_check_sblock(cur, block, level, bp)))
|
|
return error;
|
|
#endif
|
|
/*
|
|
* Increment the ptr at this level. If we're still in the block
|
|
* then we're done.
|
|
*/
|
|
if (++cur->bc_ptrs[level] <= INT_GET(block->bb_numrecs, ARCH_CONVERT)) {
|
|
*stat = 1;
|
|
return 0;
|
|
}
|
|
/*
|
|
* If we just went off the right edge of the tree, return failure.
|
|
*/
|
|
if (INT_GET(block->bb_rightsib, ARCH_CONVERT) == NULLAGBLOCK) {
|
|
*stat = 0;
|
|
return 0;
|
|
}
|
|
/*
|
|
* March up the tree incrementing pointers.
|
|
* Stop when we don't go off the right edge of a block.
|
|
*/
|
|
for (lev = level + 1; lev < cur->bc_nlevels; lev++) {
|
|
bp = cur->bc_bufs[lev];
|
|
block = XFS_BUF_TO_INOBT_BLOCK(bp);
|
|
#ifdef DEBUG
|
|
if ((error = xfs_btree_check_sblock(cur, block, lev, bp)))
|
|
return error;
|
|
#endif
|
|
if (++cur->bc_ptrs[lev] <= INT_GET(block->bb_numrecs, ARCH_CONVERT))
|
|
break;
|
|
/*
|
|
* Read-ahead the right block, we're going to read it
|
|
* in the next loop.
|
|
*/
|
|
xfs_btree_readahead(cur, lev, XFS_BTCUR_RIGHTRA);
|
|
}
|
|
/*
|
|
* If we went off the root then we are seriously confused.
|
|
*/
|
|
ASSERT(lev < cur->bc_nlevels);
|
|
/*
|
|
* Now walk back down the tree, fixing up the cursor's buffer
|
|
* pointers and key numbers.
|
|
*/
|
|
for (bp = cur->bc_bufs[lev], block = XFS_BUF_TO_INOBT_BLOCK(bp);
|
|
lev > level; ) {
|
|
xfs_agblock_t agbno; /* block number of btree block */
|
|
|
|
agbno = INT_GET(*XFS_INOBT_PTR_ADDR(block, cur->bc_ptrs[lev], cur), ARCH_CONVERT);
|
|
if ((error = xfs_btree_read_bufs(cur->bc_mp, cur->bc_tp,
|
|
cur->bc_private.i.agno, agbno, 0, &bp,
|
|
XFS_INO_BTREE_REF)))
|
|
return error;
|
|
lev--;
|
|
xfs_btree_setbuf(cur, lev, bp);
|
|
block = XFS_BUF_TO_INOBT_BLOCK(bp);
|
|
if ((error = xfs_btree_check_sblock(cur, block, lev, bp)))
|
|
return error;
|
|
cur->bc_ptrs[lev] = 1;
|
|
}
|
|
*stat = 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Insert the current record at the point referenced by cur.
|
|
* The cursor may be inconsistent on return if splits have been done.
|
|
*/
|
|
int /* error */
|
|
xfs_inobt_insert(
|
|
xfs_btree_cur_t *cur, /* btree cursor */
|
|
int *stat) /* success/failure */
|
|
{
|
|
int error; /* error return value */
|
|
int i; /* result value, 0 for failure */
|
|
int level; /* current level number in btree */
|
|
xfs_agblock_t nbno; /* new block number (split result) */
|
|
xfs_btree_cur_t *ncur; /* new cursor (split result) */
|
|
xfs_inobt_rec_t nrec; /* record being inserted this level */
|
|
xfs_btree_cur_t *pcur; /* previous level's cursor */
|
|
|
|
level = 0;
|
|
nbno = NULLAGBLOCK;
|
|
INT_SET(nrec.ir_startino, ARCH_CONVERT, cur->bc_rec.i.ir_startino);
|
|
INT_SET(nrec.ir_freecount, ARCH_CONVERT, cur->bc_rec.i.ir_freecount);
|
|
INT_SET(nrec.ir_free, ARCH_CONVERT, cur->bc_rec.i.ir_free);
|
|
ncur = (xfs_btree_cur_t *)0;
|
|
pcur = cur;
|
|
/*
|
|
* Loop going up the tree, starting at the leaf level.
|
|
* Stop when we don't get a split block, that must mean that
|
|
* the insert is finished with this level.
|
|
*/
|
|
do {
|
|
/*
|
|
* Insert nrec/nbno into this level of the tree.
|
|
* Note if we fail, nbno will be null.
|
|
*/
|
|
if ((error = xfs_inobt_insrec(pcur, level++, &nbno, &nrec, &ncur,
|
|
&i))) {
|
|
if (pcur != cur)
|
|
xfs_btree_del_cursor(pcur, XFS_BTREE_ERROR);
|
|
return error;
|
|
}
|
|
/*
|
|
* See if the cursor we just used is trash.
|
|
* Can't trash the caller's cursor, but otherwise we should
|
|
* if ncur is a new cursor or we're about to be done.
|
|
*/
|
|
if (pcur != cur && (ncur || nbno == NULLAGBLOCK)) {
|
|
cur->bc_nlevels = pcur->bc_nlevels;
|
|
xfs_btree_del_cursor(pcur, XFS_BTREE_NOERROR);
|
|
}
|
|
/*
|
|
* If we got a new cursor, switch to it.
|
|
*/
|
|
if (ncur) {
|
|
pcur = ncur;
|
|
ncur = (xfs_btree_cur_t *)0;
|
|
}
|
|
} while (nbno != NULLAGBLOCK);
|
|
*stat = i;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Lookup the record equal to ino in the btree given by cur.
|
|
*/
|
|
int /* error */
|
|
xfs_inobt_lookup_eq(
|
|
xfs_btree_cur_t *cur, /* btree cursor */
|
|
xfs_agino_t ino, /* starting inode of chunk */
|
|
__int32_t fcnt, /* free inode count */
|
|
xfs_inofree_t free, /* free inode mask */
|
|
int *stat) /* success/failure */
|
|
{
|
|
cur->bc_rec.i.ir_startino = ino;
|
|
cur->bc_rec.i.ir_freecount = fcnt;
|
|
cur->bc_rec.i.ir_free = free;
|
|
return xfs_inobt_lookup(cur, XFS_LOOKUP_EQ, stat);
|
|
}
|
|
|
|
/*
|
|
* Lookup the first record greater than or equal to ino
|
|
* in the btree given by cur.
|
|
*/
|
|
int /* error */
|
|
xfs_inobt_lookup_ge(
|
|
xfs_btree_cur_t *cur, /* btree cursor */
|
|
xfs_agino_t ino, /* starting inode of chunk */
|
|
__int32_t fcnt, /* free inode count */
|
|
xfs_inofree_t free, /* free inode mask */
|
|
int *stat) /* success/failure */
|
|
{
|
|
cur->bc_rec.i.ir_startino = ino;
|
|
cur->bc_rec.i.ir_freecount = fcnt;
|
|
cur->bc_rec.i.ir_free = free;
|
|
return xfs_inobt_lookup(cur, XFS_LOOKUP_GE, stat);
|
|
}
|
|
|
|
/*
|
|
* Lookup the first record less than or equal to ino
|
|
* in the btree given by cur.
|
|
*/
|
|
int /* error */
|
|
xfs_inobt_lookup_le(
|
|
xfs_btree_cur_t *cur, /* btree cursor */
|
|
xfs_agino_t ino, /* starting inode of chunk */
|
|
__int32_t fcnt, /* free inode count */
|
|
xfs_inofree_t free, /* free inode mask */
|
|
int *stat) /* success/failure */
|
|
{
|
|
cur->bc_rec.i.ir_startino = ino;
|
|
cur->bc_rec.i.ir_freecount = fcnt;
|
|
cur->bc_rec.i.ir_free = free;
|
|
return xfs_inobt_lookup(cur, XFS_LOOKUP_LE, stat);
|
|
}
|
|
|
|
/*
|
|
* Update the record referred to by cur, to the value given
|
|
* by [ino, fcnt, free].
|
|
* This either works (return 0) or gets an EFSCORRUPTED error.
|
|
*/
|
|
int /* error */
|
|
xfs_inobt_update(
|
|
xfs_btree_cur_t *cur, /* btree cursor */
|
|
xfs_agino_t ino, /* starting inode of chunk */
|
|
__int32_t fcnt, /* free inode count */
|
|
xfs_inofree_t free) /* free inode mask */
|
|
{
|
|
xfs_inobt_block_t *block; /* btree block to update */
|
|
xfs_buf_t *bp; /* buffer containing btree block */
|
|
int error; /* error return value */
|
|
int ptr; /* current record number (updating) */
|
|
xfs_inobt_rec_t *rp; /* pointer to updated record */
|
|
|
|
/*
|
|
* Pick up the current block.
|
|
*/
|
|
bp = cur->bc_bufs[0];
|
|
block = XFS_BUF_TO_INOBT_BLOCK(bp);
|
|
#ifdef DEBUG
|
|
if ((error = xfs_btree_check_sblock(cur, block, 0, bp)))
|
|
return error;
|
|
#endif
|
|
/*
|
|
* Get the address of the rec to be updated.
|
|
*/
|
|
ptr = cur->bc_ptrs[0];
|
|
rp = XFS_INOBT_REC_ADDR(block, ptr, cur);
|
|
/*
|
|
* Fill in the new contents and log them.
|
|
*/
|
|
INT_SET(rp->ir_startino, ARCH_CONVERT, ino);
|
|
INT_SET(rp->ir_freecount, ARCH_CONVERT, fcnt);
|
|
INT_SET(rp->ir_free, ARCH_CONVERT, free);
|
|
xfs_inobt_log_recs(cur, bp, ptr, ptr);
|
|
/*
|
|
* Updating first record in leaf. Pass new key value up to our parent.
|
|
*/
|
|
if (ptr == 1) {
|
|
xfs_inobt_key_t key; /* key containing [ino] */
|
|
|
|
INT_SET(key.ir_startino, ARCH_CONVERT, ino);
|
|
if ((error = xfs_inobt_updkey(cur, &key, 1)))
|
|
return error;
|
|
}
|
|
return 0;
|
|
}
|