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- /*
- * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
- * All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it would be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
- #include "xfs.h"
- #include "xfs_fs.h"
- #include "xfs_types.h"
- #include "xfs_bit.h"
- #include "xfs_log.h"
- #include "xfs_inum.h"
- #include "xfs_trans.h"
- #include "xfs_sb.h"
- #include "xfs_ag.h"
- #include "xfs_dir2.h"
- #include "xfs_dmapi.h"
- #include "xfs_mount.h"
- #include "xfs_bmap_btree.h"
- #include "xfs_alloc_btree.h"
- #include "xfs_ialloc_btree.h"
- #include "xfs_dir2_sf.h"
- #include "xfs_attr_sf.h"
- #include "xfs_dinode.h"
- #include "xfs_inode.h"
- #include "xfs_btree.h"
- #include "xfs_ialloc.h"
- #include "xfs_alloc.h"
- #include "xfs_error.h"
- /*
- * Prototypes for internal functions.
- */
- STATIC void xfs_alloc_log_block(xfs_trans_t *, xfs_buf_t *, int);
- STATIC void xfs_alloc_log_keys(xfs_btree_cur_t *, xfs_buf_t *, int, int);
- STATIC void xfs_alloc_log_ptrs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
- STATIC void xfs_alloc_log_recs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
- STATIC int xfs_alloc_lshift(xfs_btree_cur_t *, int, int *);
- STATIC int xfs_alloc_newroot(xfs_btree_cur_t *, int *);
- STATIC int xfs_alloc_rshift(xfs_btree_cur_t *, int, int *);
- STATIC int xfs_alloc_split(xfs_btree_cur_t *, int, xfs_agblock_t *,
- xfs_alloc_key_t *, xfs_btree_cur_t **, int *);
- /*
- * Internal functions.
- */
- /*
- * Single level of the xfs_alloc_delete record deletion routine.
- * Delete record pointed to by cur/level.
- * Remove the record from its block then rebalance the tree.
- * Return 0 for error, 1 for done, 2 to go on to the next level.
- */
- STATIC int /* error */
- xfs_alloc_delrec(
- xfs_btree_cur_t *cur, /* btree cursor */
- int level, /* level removing record from */
- int *stat) /* fail/done/go-on */
- {
- xfs_agf_t *agf; /* allocation group freelist header */
- xfs_alloc_block_t *block; /* btree block record/key lives in */
- xfs_agblock_t bno; /* btree block number */
- xfs_buf_t *bp; /* buffer for block */
- int error; /* error return value */
- int i; /* loop index */
- xfs_alloc_key_t key; /* kp points here if block is level 0 */
- xfs_agblock_t lbno; /* left block's block number */
- xfs_buf_t *lbp; /* left block's buffer pointer */
- xfs_alloc_block_t *left; /* left btree block */
- xfs_alloc_key_t *lkp=NULL; /* left block key pointer */
- xfs_alloc_ptr_t *lpp=NULL; /* left block address pointer */
- int lrecs=0; /* number of records in left block */
- xfs_alloc_rec_t *lrp; /* left block record pointer */
- xfs_mount_t *mp; /* mount structure */
- int ptr; /* index in btree block for this rec */
- xfs_agblock_t rbno; /* right block's block number */
- xfs_buf_t *rbp; /* right block's buffer pointer */
- xfs_alloc_block_t *right; /* right btree block */
- xfs_alloc_key_t *rkp; /* right block key pointer */
- xfs_alloc_ptr_t *rpp; /* right block address pointer */
- int rrecs=0; /* number of records in right block */
- int numrecs;
- xfs_alloc_rec_t *rrp; /* right block record pointer */
- xfs_btree_cur_t *tcur; /* temporary btree cursor */
- /*
- * Get the index of the entry being deleted, check for nothing there.
- */
- ptr = cur->bc_ptrs[level];
- if (ptr == 0) {
- *stat = 0;
- return 0;
- }
- /*
- * Get the buffer & block containing the record or key/ptr.
- */
- bp = cur->bc_bufs[level];
- block = XFS_BUF_TO_ALLOC_BLOCK(bp);
- #ifdef DEBUG
- if ((error = xfs_btree_check_sblock(cur, block, level, bp)))
- return error;
- #endif
- /*
- * Fail if we're off the end of the block.
- */
- numrecs = be16_to_cpu(block->bb_numrecs);
- if (ptr > numrecs) {
- *stat = 0;
- return 0;
- }
- XFS_STATS_INC(xs_abt_delrec);
- /*
- * It's a nonleaf. Excise the key and ptr being deleted, by
- * sliding the entries past them down one.
- * Log the changed areas of the block.
- */
- if (level > 0) {
- lkp = XFS_ALLOC_KEY_ADDR(block, 1, cur);
- lpp = XFS_ALLOC_PTR_ADDR(block, 1, cur);
- #ifdef DEBUG
- for (i = ptr; i < numrecs; i++) {
- if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(lpp[i]), level)))
- return error;
- }
- #endif
- if (ptr < numrecs) {
- memmove(&lkp[ptr - 1], &lkp[ptr],
- (numrecs - ptr) * sizeof(*lkp));
- memmove(&lpp[ptr - 1], &lpp[ptr],
- (numrecs - ptr) * sizeof(*lpp));
- xfs_alloc_log_ptrs(cur, bp, ptr, numrecs - 1);
- xfs_alloc_log_keys(cur, bp, ptr, numrecs - 1);
- }
- }
- /*
- * It's a leaf. Excise the record being deleted, by sliding the
- * entries past it down one. Log the changed areas of the block.
- */
- else {
- lrp = XFS_ALLOC_REC_ADDR(block, 1, cur);
- if (ptr < numrecs) {
- memmove(&lrp[ptr - 1], &lrp[ptr],
- (numrecs - ptr) * sizeof(*lrp));
- xfs_alloc_log_recs(cur, bp, ptr, numrecs - 1);
- }
- /*
- * If it's the first record in the block, we'll need a key
- * structure to pass up to the next level (updkey).
- */
- if (ptr == 1) {
- key.ar_startblock = lrp->ar_startblock;
- key.ar_blockcount = lrp->ar_blockcount;
- lkp = &key;
- }
- }
- /*
- * Decrement and log the number of entries in the block.
- */
- numrecs--;
- block->bb_numrecs = cpu_to_be16(numrecs);
- xfs_alloc_log_block(cur->bc_tp, bp, XFS_BB_NUMRECS);
- /*
- * See if the longest free extent in the allocation group was
- * changed by this operation. True if it's the by-size btree, and
- * this is the leaf level, and there is no right sibling block,
- * and this was the last record.
- */
- agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
- mp = cur->bc_mp;
- if (level == 0 &&
- cur->bc_btnum == XFS_BTNUM_CNT &&
- be32_to_cpu(block->bb_rightsib) == NULLAGBLOCK &&
- ptr > numrecs) {
- ASSERT(ptr == numrecs + 1);
- /*
- * There are still records in the block. Grab the size
- * from the last one.
- */
- if (numrecs) {
- rrp = XFS_ALLOC_REC_ADDR(block, numrecs, cur);
- agf->agf_longest = rrp->ar_blockcount;
- }
- /*
- * No free extents left.
- */
- else
- agf->agf_longest = 0;
- mp->m_perag[be32_to_cpu(agf->agf_seqno)].pagf_longest =
- be32_to_cpu(agf->agf_longest);
- xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp,
- XFS_AGF_LONGEST);
- }
- /*
- * Is this the root level? If so, we're almost done.
- */
- if (level == cur->bc_nlevels - 1) {
- /*
- * If this is the root level,
- * and there's only one entry left,
- * and it's NOT the leaf level,
- * then we can get rid of this level.
- */
- if (numrecs == 1 && level > 0) {
- /*
- * lpp is still set to the first pointer in the block.
- * Make it the new root of the btree.
- */
- bno = be32_to_cpu(agf->agf_roots[cur->bc_btnum]);
- agf->agf_roots[cur->bc_btnum] = *lpp;
- be32_add_cpu(&agf->agf_levels[cur->bc_btnum], -1);
- mp->m_perag[be32_to_cpu(agf->agf_seqno)].pagf_levels[cur->bc_btnum]--;
- /*
- * Put this buffer/block on the ag's freelist.
- */
- error = xfs_alloc_put_freelist(cur->bc_tp,
- cur->bc_private.a.agbp, NULL, bno, 1);
- if (error)
- return error;
- /*
- * Since blocks move to the free list without the
- * coordination used in xfs_bmap_finish, we can't allow
- * block to be available for reallocation and
- * non-transaction writing (user data) until we know
- * that the transaction that moved it to the free list
- * is permanently on disk. We track the blocks by
- * declaring these blocks as "busy"; the busy list is
- * maintained on a per-ag basis and each transaction
- * records which entries should be removed when the
- * iclog commits to disk. If a busy block is
- * allocated, the iclog is pushed up to the LSN
- * that freed the block.
- */
- xfs_alloc_mark_busy(cur->bc_tp,
- be32_to_cpu(agf->agf_seqno), bno, 1);
- xfs_trans_agbtree_delta(cur->bc_tp, -1);
- xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp,
- XFS_AGF_ROOTS | XFS_AGF_LEVELS);
- /*
- * Update the cursor so there's one fewer level.
- */
- xfs_btree_setbuf(cur, level, NULL);
- cur->bc_nlevels--;
- } else if (level > 0 &&
- (error = xfs_btree_decrement(cur, level, &i)))
- return error;
- *stat = 1;
- return 0;
- }
- /*
- * If we deleted the leftmost entry in the block, update the
- * key values above us in the tree.
- */
- if (ptr == 1 && (error = xfs_btree_updkey(cur, (union xfs_btree_key *)lkp, level + 1)))
- return error;
- /*
- * If the number of records remaining in the block is at least
- * the minimum, we're done.
- */
- if (numrecs >= XFS_ALLOC_BLOCK_MINRECS(level, cur)) {
- if (level > 0 && (error = xfs_btree_decrement(cur, level, &i)))
- return error;
- *stat = 1;
- return 0;
- }
- /*
- * Otherwise, we have to move some records around to keep the
- * tree balanced. Look at the left and right sibling blocks to
- * see if we can re-balance by moving only one record.
- */
- rbno = be32_to_cpu(block->bb_rightsib);
- lbno = be32_to_cpu(block->bb_leftsib);
- bno = NULLAGBLOCK;
- ASSERT(rbno != NULLAGBLOCK || lbno != NULLAGBLOCK);
- /*
- * Duplicate the cursor so our btree manipulations here won't
- * disrupt the next level up.
- */
- if ((error = xfs_btree_dup_cursor(cur, &tcur)))
- return error;
- /*
- * If there's a right sibling, see if it's ok to shift an entry
- * out of it.
- */
- if (rbno != NULLAGBLOCK) {
- /*
- * Move the temp cursor to the last entry in the next block.
- * Actually any entry but the first would suffice.
- */
- i = xfs_btree_lastrec(tcur, level);
- XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
- if ((error = xfs_btree_increment(tcur, level, &i)))
- goto error0;
- XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
- i = xfs_btree_lastrec(tcur, level);
- XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
- /*
- * Grab a pointer to the block.
- */
- rbp = tcur->bc_bufs[level];
- right = XFS_BUF_TO_ALLOC_BLOCK(rbp);
- #ifdef DEBUG
- if ((error = xfs_btree_check_sblock(cur, right, level, rbp)))
- goto error0;
- #endif
- /*
- * Grab the current block number, for future use.
- */
- bno = be32_to_cpu(right->bb_leftsib);
- /*
- * If right block is full enough so that removing one entry
- * won't make it too empty, and left-shifting an entry out
- * of right to us works, we're done.
- */
- if (be16_to_cpu(right->bb_numrecs) - 1 >=
- XFS_ALLOC_BLOCK_MINRECS(level, cur)) {
- if ((error = xfs_alloc_lshift(tcur, level, &i)))
- goto error0;
- if (i) {
- ASSERT(be16_to_cpu(block->bb_numrecs) >=
- XFS_ALLOC_BLOCK_MINRECS(level, cur));
- xfs_btree_del_cursor(tcur,
- XFS_BTREE_NOERROR);
- if (level > 0 &&
- (error = xfs_btree_decrement(cur, level,
- &i)))
- return error;
- *stat = 1;
- return 0;
- }
- }
- /*
- * Otherwise, grab the number of records in right for
- * future reference, and fix up the temp cursor to point
- * to our block again (last record).
- */
- rrecs = be16_to_cpu(right->bb_numrecs);
- if (lbno != NULLAGBLOCK) {
- i = xfs_btree_firstrec(tcur, level);
- XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
- if ((error = xfs_btree_decrement(tcur, level, &i)))
- goto error0;
- XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
- }
- }
- /*
- * If there's a left sibling, see if it's ok to shift an entry
- * out of it.
- */
- if (lbno != NULLAGBLOCK) {
- /*
- * Move the temp cursor to the first entry in the
- * previous block.
- */
- i = xfs_btree_firstrec(tcur, level);
- XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
- if ((error = xfs_btree_decrement(tcur, level, &i)))
- goto error0;
- XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
- xfs_btree_firstrec(tcur, level);
- /*
- * Grab a pointer to the block.
- */
- lbp = tcur->bc_bufs[level];
- left = XFS_BUF_TO_ALLOC_BLOCK(lbp);
- #ifdef DEBUG
- if ((error = xfs_btree_check_sblock(cur, left, level, lbp)))
- goto error0;
- #endif
- /*
- * Grab the current block number, for future use.
- */
- bno = be32_to_cpu(left->bb_rightsib);
- /*
- * If left block is full enough so that removing one entry
- * won't make it too empty, and right-shifting an entry out
- * of left to us works, we're done.
- */
- if (be16_to_cpu(left->bb_numrecs) - 1 >=
- XFS_ALLOC_BLOCK_MINRECS(level, cur)) {
- if ((error = xfs_alloc_rshift(tcur, level, &i)))
- goto error0;
- if (i) {
- ASSERT(be16_to_cpu(block->bb_numrecs) >=
- XFS_ALLOC_BLOCK_MINRECS(level, cur));
- xfs_btree_del_cursor(tcur,
- XFS_BTREE_NOERROR);
- if (level == 0)
- cur->bc_ptrs[0]++;
- *stat = 1;
- return 0;
- }
- }
- /*
- * Otherwise, grab the number of records in right for
- * future reference.
- */
- lrecs = be16_to_cpu(left->bb_numrecs);
- }
- /*
- * Delete the temp cursor, we're done with it.
- */
- xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
- /*
- * If here, we need to do a join to keep the tree balanced.
- */
- ASSERT(bno != NULLAGBLOCK);
- /*
- * See if we can join with the left neighbor block.
- */
- if (lbno != NULLAGBLOCK &&
- lrecs + numrecs <= XFS_ALLOC_BLOCK_MAXRECS(level, cur)) {
- /*
- * Set "right" to be the starting block,
- * "left" to be the left neighbor.
- */
- rbno = bno;
- right = block;
- rrecs = be16_to_cpu(right->bb_numrecs);
- rbp = bp;
- if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
- cur->bc_private.a.agno, lbno, 0, &lbp,
- XFS_ALLOC_BTREE_REF)))
- return error;
- left = XFS_BUF_TO_ALLOC_BLOCK(lbp);
- lrecs = be16_to_cpu(left->bb_numrecs);
- 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 &&
- rrecs + numrecs <= XFS_ALLOC_BLOCK_MAXRECS(level, cur)) {
- /*
- * Set "left" to be the starting block,
- * "right" to be the right neighbor.
- */
- lbno = bno;
- left = block;
- lrecs = be16_to_cpu(left->bb_numrecs);
- lbp = bp;
- if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
- cur->bc_private.a.agno, rbno, 0, &rbp,
- XFS_ALLOC_BTREE_REF)))
- return error;
- right = XFS_BUF_TO_ALLOC_BLOCK(rbp);
- rrecs = be16_to_cpu(right->bb_numrecs);
- if ((error = xfs_btree_check_sblock(cur, right, level, rbp)))
- 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_btree_decrement(cur, level, &i)))
- return error;
- *stat = 1;
- 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_ALLOC_KEY_ADDR(left, lrecs + 1, cur);
- lpp = XFS_ALLOC_PTR_ADDR(left, lrecs + 1, cur);
- rkp = XFS_ALLOC_KEY_ADDR(right, 1, cur);
- rpp = XFS_ALLOC_PTR_ADDR(right, 1, cur);
- #ifdef DEBUG
- for (i = 0; i < rrecs; i++) {
- if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(rpp[i]), level)))
- return error;
- }
- #endif
- memcpy(lkp, rkp, rrecs * sizeof(*lkp));
- memcpy(lpp, rpp, rrecs * sizeof(*lpp));
- xfs_alloc_log_keys(cur, lbp, lrecs + 1, lrecs + rrecs);
- xfs_alloc_log_ptrs(cur, lbp, lrecs + 1, lrecs + rrecs);
- } else {
- /*
- * It's a leaf. Move records.
- */
- lrp = XFS_ALLOC_REC_ADDR(left, lrecs + 1, cur);
- rrp = XFS_ALLOC_REC_ADDR(right, 1, cur);
- memcpy(lrp, rrp, rrecs * sizeof(*lrp));
- xfs_alloc_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_btree_increment(cur, level + 1, &i)))
- return error;
- /*
- * Fix up the number of records in the surviving block.
- */
- lrecs += rrecs;
- left->bb_numrecs = cpu_to_be16(lrecs);
- /*
- * Fix up the right block pointer in the surviving block, and log it.
- */
- left->bb_rightsib = right->bb_rightsib;
- xfs_alloc_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 (be32_to_cpu(left->bb_rightsib) != NULLAGBLOCK) {
- xfs_alloc_block_t *rrblock;
- xfs_buf_t *rrbp;
- if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
- cur->bc_private.a.agno, be32_to_cpu(left->bb_rightsib), 0,
- &rrbp, XFS_ALLOC_BTREE_REF)))
- return error;
- rrblock = XFS_BUF_TO_ALLOC_BLOCK(rrbp);
- if ((error = xfs_btree_check_sblock(cur, rrblock, level, rrbp)))
- return error;
- rrblock->bb_leftsib = cpu_to_be32(lbno);
- xfs_alloc_log_block(cur->bc_tp, rrbp, XFS_BB_LEFTSIB);
- }
- /*
- * Free the deleting block by putting it on the freelist.
- */
- error = xfs_alloc_put_freelist(cur->bc_tp,
- cur->bc_private.a.agbp, NULL, rbno, 1);
- if (error)
- return error;
- /*
- * Since blocks move to the free list without the coordination
- * used in xfs_bmap_finish, we can't allow block to be available
- * for reallocation and non-transaction writing (user data)
- * until we know that the transaction that moved it to the free
- * list is permanently on disk. We track the blocks by declaring
- * these blocks as "busy"; the busy list is maintained on a
- * per-ag basis and each transaction records which entries
- * should be removed when the iclog commits to disk. If a
- * busy block is allocated, the iclog is pushed up to the
- * LSN that freed the block.
- */
- xfs_alloc_mark_busy(cur->bc_tp, be32_to_cpu(agf->agf_seqno), bno, 1);
- xfs_trans_agbtree_delta(cur->bc_tp, -1);
- /*
- * Adjust the current level's cursor so that we're left referring
- * to the right node, after we're done.
- * If this leaves the ptr value 0 our caller will fix it 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_alloc_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_alloc_rec_t *recp, /* i/o: record data inserted */
- xfs_btree_cur_t **curp, /* output: new cursor replacing cur */
- int *stat) /* output: success/failure */
- {
- xfs_agf_t *agf; /* allocation group freelist header */
- xfs_alloc_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_alloc_key_t key; /* key value being inserted */
- xfs_alloc_key_t *kp; /* 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_alloc_key_t nkey; /* new key value, from split */
- xfs_alloc_rec_t nrec; /* new record value, for caller */
- int numrecs;
- int optr; /* old ptr value */
- xfs_alloc_ptr_t *pp; /* pointer to btree addresses */
- int ptr; /* index in btree block for this rec */
- xfs_alloc_rec_t *rp; /* pointer to btree records */
- ASSERT(be32_to_cpu(recp->ar_blockcount) > 0);
- /*
- * GCC doesn't understand the (arguably complex) control flow in
- * this function and complains about uninitialized structure fields
- * without this.
- */
- memset(&nrec, 0, sizeof(nrec));
- /*
- * If we made it to the root level, allocate a new root block
- * and we're done.
- */
- if (level >= cur->bc_nlevels) {
- XFS_STATS_INC(xs_abt_insrec);
- if ((error = xfs_alloc_newroot(cur, &i)))
- return error;
- *bnop = NULLAGBLOCK;
- *stat = i;
- return 0;
- }
- /*
- * Make a key out of the record data to be inserted, and save it.
- */
- key.ar_startblock = recp->ar_startblock;
- key.ar_blockcount = recp->ar_blockcount;
- optr = ptr = cur->bc_ptrs[level];
- /*
- * If we're off the left edge, return failure.
- */
- if (ptr == 0) {
- *stat = 0;
- return 0;
- }
- XFS_STATS_INC(xs_abt_insrec);
- /*
- * Get pointers to the btree buffer and block.
- */
- bp = cur->bc_bufs[level];
- block = XFS_BUF_TO_ALLOC_BLOCK(bp);
- numrecs = be16_to_cpu(block->bb_numrecs);
- #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_ALLOC_REC_ADDR(block, ptr, cur);
- xfs_btree_check_rec(cur->bc_btnum, recp, rp);
- } else {
- kp = XFS_ALLOC_KEY_ADDR(block, ptr, cur);
- xfs_btree_check_key(cur->bc_btnum, &key, kp);
- }
- }
- #endif
- nbno = NULLAGBLOCK;
- ncur = NULL;
- /*
- * If the block is full, we can't insert the new entry until we
- * make the block un-full.
- */
- if (numrecs == XFS_ALLOC_BLOCK_MAXRECS(level, cur)) {
- /*
- * First, try shifting an entry to the right neighbor.
- */
- if ((error = xfs_alloc_rshift(cur, level, &i)))
- return error;
- if (i) {
- /* nothing */
- }
- /*
- * Next, try shifting an entry to the left neighbor.
- */
- else {
- if ((error = xfs_alloc_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_alloc_split(cur, level, &nbno,
- &nkey, &ncur, &i)))
- return error;
- if (i) {
- bp = cur->bc_bufs[level];
- block = XFS_BUF_TO_ALLOC_BLOCK(bp);
- #ifdef DEBUG
- if ((error =
- xfs_btree_check_sblock(cur,
- block, level, bp)))
- return error;
- #endif
- ptr = cur->bc_ptrs[level];
- nrec.ar_startblock = nkey.ar_startblock;
- nrec.ar_blockcount = nkey.ar_blockcount;
- }
- /*
- * Otherwise the insert fails.
- */
- else {
- *stat = 0;
- return 0;
- }
- }
- }
- }
- /*
- * At this point we know there's room for our new entry in the block
- * we're pointing at.
- */
- numrecs = be16_to_cpu(block->bb_numrecs);
- 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_ALLOC_KEY_ADDR(block, 1, cur);
- pp = XFS_ALLOC_PTR_ADDR(block, 1, cur);
- #ifdef DEBUG
- for (i = numrecs; i >= ptr; i--) {
- if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(pp[i - 1]), 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));
- #ifdef DEBUG
- if ((error = xfs_btree_check_sptr(cur, *bnop, level)))
- return error;
- #endif
- /*
- * Now stuff the new data in, bump numrecs and log the new data.
- */
- kp[ptr - 1] = key;
- pp[ptr - 1] = cpu_to_be32(*bnop);
- numrecs++;
- block->bb_numrecs = cpu_to_be16(numrecs);
- xfs_alloc_log_keys(cur, bp, ptr, numrecs);
- xfs_alloc_log_ptrs(cur, bp, ptr, numrecs);
- #ifdef DEBUG
- if (ptr < numrecs)
- xfs_btree_check_key(cur->bc_btnum, kp + ptr - 1,
- kp + ptr);
- #endif
- } else {
- /*
- * It's a leaf entry. Make a hole for the new record.
- */
- rp = XFS_ALLOC_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;
- numrecs++;
- block->bb_numrecs = cpu_to_be16(numrecs);
- xfs_alloc_log_recs(cur, bp, ptr, numrecs);
- #ifdef DEBUG
- if (ptr < numrecs)
- xfs_btree_check_rec(cur->bc_btnum, rp + ptr - 1,
- rp + ptr);
- #endif
- }
- /*
- * Log the new number of records in the btree header.
- */
- xfs_alloc_log_block(cur->bc_tp, bp, XFS_BB_NUMRECS);
- /*
- * If we inserted at the start of a block, update the parents' keys.
- */
- if (optr == 1 && (error = xfs_btree_updkey(cur, (union xfs_btree_key *)&key, level + 1)))
- return error;
- /*
- * Look to see if the longest extent in the allocation group
- * needs to be updated.
- */
- agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
- if (level == 0 &&
- cur->bc_btnum == XFS_BTNUM_CNT &&
- be32_to_cpu(block->bb_rightsib) == NULLAGBLOCK &&
- be32_to_cpu(recp->ar_blockcount) > be32_to_cpu(agf->agf_longest)) {
- /*
- * If this is a leaf in the by-size btree and there
- * is no right sibling block and this block is bigger
- * than the previous longest block, update it.
- */
- agf->agf_longest = recp->ar_blockcount;
- cur->bc_mp->m_perag[be32_to_cpu(agf->agf_seqno)].pagf_longest
- = be32_to_cpu(recp->ar_blockcount);
- xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp,
- XFS_AGF_LONGEST);
- }
- /*
- * 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;
- *curp = ncur;
- }
- *stat = 1;
- return 0;
- }
- /*
- * Log header fields from a btree block.
- */
- STATIC void
- xfs_alloc_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_alloc_block_t, bb_magic),
- offsetof(xfs_alloc_block_t, bb_level),
- offsetof(xfs_alloc_block_t, bb_numrecs),
- offsetof(xfs_alloc_block_t, bb_leftsib),
- offsetof(xfs_alloc_block_t, bb_rightsib),
- sizeof(xfs_alloc_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_alloc_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_alloc_block_t *block; /* btree block to log from */
- int first; /* first byte offset logged */
- xfs_alloc_key_t *kp; /* key pointer in btree block */
- int last; /* last byte offset logged */
- block = XFS_BUF_TO_ALLOC_BLOCK(bp);
- kp = XFS_ALLOC_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_alloc_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_alloc_block_t *block; /* btree block to log from */
- int first; /* first byte offset logged */
- int last; /* last byte offset logged */
- xfs_alloc_ptr_t *pp; /* block-pointer pointer in btree blk */
- block = XFS_BUF_TO_ALLOC_BLOCK(bp);
- pp = XFS_ALLOC_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_alloc_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_alloc_block_t *block; /* btree block to log from */
- int first; /* first byte offset logged */
- int last; /* last byte offset logged */
- xfs_alloc_rec_t *rp; /* record pointer for btree block */
- block = XFS_BUF_TO_ALLOC_BLOCK(bp);
- rp = XFS_ALLOC_REC_ADDR(block, 1, cur);
- #ifdef DEBUG
- {
- xfs_agf_t *agf;
- xfs_alloc_rec_t *p;
- agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
- for (p = &rp[rfirst - 1]; p <= &rp[rlast - 1]; p++)
- ASSERT(be32_to_cpu(p->ar_startblock) +
- be32_to_cpu(p->ar_blockcount) <=
- be32_to_cpu(agf->agf_length));
- }
- #endif
- 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);
- }
- /*
- * Move 1 record left from cur/level if possible.
- * Update cur to reflect the new path.
- */
- STATIC int /* error */
- xfs_alloc_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_alloc_key_t key; /* key value for leaf level upward */
- xfs_buf_t *lbp; /* buffer for left neighbor block */
- xfs_alloc_block_t *left; /* left neighbor btree block */
- int nrec; /* new number of left block entries */
- xfs_buf_t *rbp; /* buffer for right (current) block */
- xfs_alloc_block_t *right; /* right (current) btree block */
- xfs_alloc_key_t *rkp=NULL; /* key pointer for right block */
- xfs_alloc_ptr_t *rpp=NULL; /* address pointer for right block */
- xfs_alloc_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_ALLOC_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 (be32_to_cpu(right->bb_leftsib) == 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.a.agno, be32_to_cpu(right->bb_leftsib),
- 0, &lbp, XFS_ALLOC_BTREE_REF)))
- return error;
- left = XFS_BUF_TO_ALLOC_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 (be16_to_cpu(left->bb_numrecs) == XFS_ALLOC_BLOCK_MAXRECS(level, cur)) {
- *stat = 0;
- return 0;
- }
- nrec = be16_to_cpu(left->bb_numrecs) + 1;
- /*
- * If non-leaf, copy a key and a ptr to the left block.
- */
- if (level > 0) {
- xfs_alloc_key_t *lkp; /* key pointer for left block */
- xfs_alloc_ptr_t *lpp; /* address pointer for left block */
- lkp = XFS_ALLOC_KEY_ADDR(left, nrec, cur);
- rkp = XFS_ALLOC_KEY_ADDR(right, 1, cur);
- *lkp = *rkp;
- xfs_alloc_log_keys(cur, lbp, nrec, nrec);
- lpp = XFS_ALLOC_PTR_ADDR(left, nrec, cur);
- rpp = XFS_ALLOC_PTR_ADDR(right, 1, cur);
- #ifdef DEBUG
- if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(*rpp), level)))
- return error;
- #endif
- *lpp = *rpp;
- xfs_alloc_log_ptrs(cur, lbp, nrec, nrec);
- xfs_btree_check_key(cur->bc_btnum, lkp - 1, lkp);
- }
- /*
- * If leaf, copy a record to the left block.
- */
- else {
- xfs_alloc_rec_t *lrp; /* record pointer for left block */
- lrp = XFS_ALLOC_REC_ADDR(left, nrec, cur);
- rrp = XFS_ALLOC_REC_ADDR(right, 1, cur);
- *lrp = *rrp;
- xfs_alloc_log_recs(cur, lbp, nrec, nrec);
- xfs_btree_check_rec(cur->bc_btnum, lrp - 1, lrp);
- }
- /*
- * Bump and log left's numrecs, decrement and log right's numrecs.
- */
- be16_add_cpu(&left->bb_numrecs, 1);
- xfs_alloc_log_block(cur->bc_tp, lbp, XFS_BB_NUMRECS);
- be16_add_cpu(&right->bb_numrecs, -1);
- xfs_alloc_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 < be16_to_cpu(right->bb_numrecs); i++) {
- if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(rpp[i + 1]),
- level)))
- return error;
- }
- #endif
- memmove(rkp, rkp + 1, be16_to_cpu(right->bb_numrecs) * sizeof(*rkp));
- memmove(rpp, rpp + 1, be16_to_cpu(right->bb_numrecs) * sizeof(*rpp));
- xfs_alloc_log_keys(cur, rbp, 1, be16_to_cpu(right->bb_numrecs));
- xfs_alloc_log_ptrs(cur, rbp, 1, be16_to_cpu(right->bb_numrecs));
- } else {
- memmove(rrp, rrp + 1, be16_to_cpu(right->bb_numrecs) * sizeof(*rrp));
- xfs_alloc_log_recs(cur, rbp, 1, be16_to_cpu(right->bb_numrecs));
- key.ar_startblock = rrp->ar_startblock;
- key.ar_blockcount = rrp->ar_blockcount;
- rkp = &key;
- }
- /*
- * Update the parent key values of right.
- */
- if ((error = xfs_btree_updkey(cur, (union xfs_btree_key *)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_alloc_newroot(
- xfs_btree_cur_t *cur, /* btree cursor */
- int *stat) /* success/failure */
- {
- int error; /* error return value */
- xfs_agblock_t lbno; /* left block number */
- xfs_buf_t *lbp; /* left btree buffer */
- xfs_alloc_block_t *left; /* left btree block */
- xfs_mount_t *mp; /* mount structure */
- xfs_agblock_t nbno; /* new block number */
- xfs_buf_t *nbp; /* new (root) buffer */
- xfs_alloc_block_t *new; /* new (root) btree block */
- int nptr; /* new value for key index, 1 or 2 */
- xfs_agblock_t rbno; /* right block number */
- xfs_buf_t *rbp; /* right btree buffer */
- xfs_alloc_block_t *right; /* right btree block */
- mp = cur->bc_mp;
- ASSERT(cur->bc_nlevels < XFS_AG_MAXLEVELS(mp));
- /*
- * Get a buffer from the freelist blocks, for the new root.
- */
- error = xfs_alloc_get_freelist(cur->bc_tp,
- cur->bc_private.a.agbp, &nbno, 1);
- if (error)
- return error;
- /*
- * None available, we fail.
- */
- if (nbno == NULLAGBLOCK) {
- *stat = 0;
- return 0;
- }
- xfs_trans_agbtree_delta(cur->bc_tp, 1);
- nbp = xfs_btree_get_bufs(mp, cur->bc_tp, cur->bc_private.a.agno, nbno,
- 0);
- new = XFS_BUF_TO_ALLOC_BLOCK(nbp);
- /*
- * Set the root data in the a.g. freespace structure.
- */
- {
- xfs_agf_t *agf; /* a.g. freespace header */
- xfs_agnumber_t seqno;
- agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
- agf->agf_roots[cur->bc_btnum] = cpu_to_be32(nbno);
- be32_add_cpu(&agf->agf_levels[cur->bc_btnum], 1);
- seqno = be32_to_cpu(agf->agf_seqno);
- mp->m_perag[seqno].pagf_levels[cur->bc_btnum]++;
- xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp,
- XFS_AGF_ROOTS | XFS_AGF_LEVELS);
- }
- /*
- * 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.
- */
- lbp = cur->bc_bufs[cur->bc_nlevels - 1];
- left = XFS_BUF_TO_ALLOC_BLOCK(lbp);
- #ifdef DEBUG
- if ((error = xfs_btree_check_sblock(cur, left, cur->bc_nlevels - 1, lbp)))
- return error;
- #endif
- if (be32_to_cpu(left->bb_rightsib) != NULLAGBLOCK) {
- /*
- * Our block is left, pick up the right block.
- */
- lbno = XFS_DADDR_TO_AGBNO(mp, XFS_BUF_ADDR(lbp));
- rbno = be32_to_cpu(left->bb_rightsib);
- if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
- cur->bc_private.a.agno, rbno, 0, &rbp,
- XFS_ALLOC_BTREE_REF)))
- return error;
- right = XFS_BUF_TO_ALLOC_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 = lbp;
- right = left;
- rbno = XFS_DADDR_TO_AGBNO(mp, XFS_BUF_ADDR(rbp));
- lbno = be32_to_cpu(right->bb_leftsib);
- if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
- cur->bc_private.a.agno, lbno, 0, &lbp,
- XFS_ALLOC_BTREE_REF)))
- return error;
- left = XFS_BUF_TO_ALLOC_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.
- */
- new->bb_magic = cpu_to_be32(xfs_magics[cur->bc_btnum]);
- new->bb_level = cpu_to_be16(cur->bc_nlevels);
- new->bb_numrecs = cpu_to_be16(2);
- new->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
- new->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
- xfs_alloc_log_block(cur->bc_tp, nbp, XFS_BB_ALL_BITS);
- ASSERT(lbno != NULLAGBLOCK && rbno != NULLAGBLOCK);
- /*
- * Fill in the key data in the new root.
- */
- {
- xfs_alloc_key_t *kp; /* btree key pointer */
- kp = XFS_ALLOC_KEY_ADDR(new, 1, cur);
- if (be16_to_cpu(left->bb_level) > 0) {
- kp[0] = *XFS_ALLOC_KEY_ADDR(left, 1, cur);
- kp[1] = *XFS_ALLOC_KEY_ADDR(right, 1, cur);
- } else {
- xfs_alloc_rec_t *rp; /* btree record pointer */
- rp = XFS_ALLOC_REC_ADDR(left, 1, cur);
- kp[0].ar_startblock = rp->ar_startblock;
- kp[0].ar_blockcount = rp->ar_blockcount;
- rp = XFS_ALLOC_REC_ADDR(right, 1, cur);
- kp[1].ar_startblock = rp->ar_startblock;
- kp[1].ar_blockcount = rp->ar_blockcount;
- }
- }
- xfs_alloc_log_keys(cur, nbp, 1, 2);
- /*
- * Fill in the pointer data in the new root.
- */
- {
- xfs_alloc_ptr_t *pp; /* btree address pointer */
- pp = XFS_ALLOC_PTR_ADDR(new, 1, cur);
- pp[0] = cpu_to_be32(lbno);
- pp[1] = cpu_to_be32(rbno);
- }
- xfs_alloc_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_alloc_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_alloc_key_t key; /* key value for leaf level upward */
- xfs_buf_t *lbp; /* buffer for left (current) block */
- xfs_alloc_block_t *left; /* left (current) btree block */
- xfs_buf_t *rbp; /* buffer for right neighbor block */
- xfs_alloc_block_t *right; /* right neighbor btree block */
- xfs_alloc_key_t *rkp; /* key 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_ALLOC_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 (be32_to_cpu(left->bb_rightsib) == 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] >= be16_to_cpu(left->bb_numrecs)) {
- *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.a.agno, be32_to_cpu(left->bb_rightsib),
- 0, &rbp, XFS_ALLOC_BTREE_REF)))
- return error;
- right = XFS_BUF_TO_ALLOC_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 (be16_to_cpu(right->bb_numrecs) == XFS_ALLOC_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) {
- xfs_alloc_key_t *lkp; /* key pointer for left block */
- xfs_alloc_ptr_t *lpp; /* address pointer for left block */
- xfs_alloc_ptr_t *rpp; /* address pointer for right block */
- lkp = XFS_ALLOC_KEY_ADDR(left, be16_to_cpu(left->bb_numrecs), cur);
- lpp = XFS_ALLOC_PTR_ADDR(left, be16_to_cpu(left->bb_numrecs), cur);
- rkp = XFS_ALLOC_KEY_ADDR(right, 1, cur);
- rpp = XFS_ALLOC_PTR_ADDR(right, 1, cur);
- #ifdef DEBUG
- for (i = be16_to_cpu(right->bb_numrecs) - 1; i >= 0; i--) {
- if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(rpp[i]), level)))
- return error;
- }
- #endif
- memmove(rkp + 1, rkp, be16_to_cpu(right->bb_numrecs) * sizeof(*rkp));
- memmove(rpp + 1, rpp, be16_to_cpu(right->bb_numrecs) * sizeof(*rpp));
- #ifdef DEBUG
- if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(*lpp), level)))
- return error;
- #endif
- *rkp = *lkp;
- *rpp = *lpp;
- xfs_alloc_log_keys(cur, rbp, 1, be16_to_cpu(right->bb_numrecs) + 1);
- xfs_alloc_log_ptrs(cur, rbp, 1, be16_to_cpu(right->bb_numrecs) + 1);
- xfs_btree_check_key(cur->bc_btnum, rkp, rkp + 1);
- } else {
- xfs_alloc_rec_t *lrp; /* record pointer for left block */
- xfs_alloc_rec_t *rrp; /* record pointer for right block */
- lrp = XFS_ALLOC_REC_ADDR(left, be16_to_cpu(left->bb_numrecs), cur);
- rrp = XFS_ALLOC_REC_ADDR(right, 1, cur);
- memmove(rrp + 1, rrp, be16_to_cpu(right->bb_numrecs) * sizeof(*rrp));
- *rrp = *lrp;
- xfs_alloc_log_recs(cur, rbp, 1, be16_to_cpu(right->bb_numrecs) + 1);
- key.ar_startblock = rrp->ar_startblock;
- key.ar_blockcount = rrp->ar_blockcount;
- rkp = &key;
- xfs_btree_check_rec(cur->bc_btnum, rrp, rrp + 1);
- }
- /*
- * Decrement and log left's numrecs, bump and log right's numrecs.
- */
- be16_add_cpu(&left->bb_numrecs, -1);
- xfs_alloc_log_block(cur->bc_tp, lbp, XFS_BB_NUMRECS);
- be16_add_cpu(&right->bb_numrecs, 1);
- xfs_alloc_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;
- i = xfs_btree_lastrec(tcur, level);
- XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
- if ((error = xfs_btree_increment(tcur, level, &i)) ||
- (error = xfs_btree_updkey(tcur, (union xfs_btree_key *)rkp, level + 1)))
- goto error0;
- xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
- *stat = 1;
- return 0;
- error0:
- xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR);
- return error;
- }
- /*
- * Split cur/level block in half.
- * Return new block number and its first record (to be inserted into parent).
- */
- STATIC int /* error */
- xfs_alloc_split(
- xfs_btree_cur_t *cur, /* btree cursor */
- int level, /* level to split */
- xfs_agblock_t *bnop, /* output: block number allocated */
- xfs_alloc_key_t *keyp, /* output: first key of new block */
- xfs_btree_cur_t **curp, /* output: new cursor */
- int *stat) /* success/failure */
- {
- 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_alloc_block_t *left; /* left (current) btree block */
- xfs_agblock_t rbno; /* right (new) block number */
- xfs_buf_t *rbp; /* buffer for right block */
- xfs_alloc_block_t *right; /* right (new) btree block */
- /*
- * Allocate the new block from the freelist.
- * If we can't do it, we're toast. Give up.
- */
- error = xfs_alloc_get_freelist(cur->bc_tp,
- cur->bc_private.a.agbp, &rbno, 1);
- if (error)
- return error;
- if (rbno == NULLAGBLOCK) {
- *stat = 0;
- return 0;
- }
- xfs_trans_agbtree_delta(cur->bc_tp, 1);
- rbp = xfs_btree_get_bufs(cur->bc_mp, cur->bc_tp, cur->bc_private.a.agno,
- rbno, 0);
- /*
- * Set up the new block as "right".
- */
- right = XFS_BUF_TO_ALLOC_BLOCK(rbp);
- /*
- * "Left" is the current (according to the cursor) block.
- */
- lbp = cur->bc_bufs[level];
- left = XFS_BUF_TO_ALLOC_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.
- */
- right->bb_magic = cpu_to_be32(xfs_magics[cur->bc_btnum]);
- right->bb_level = left->bb_level;
- right->bb_numrecs = cpu_to_be16(be16_to_cpu(left->bb_numrecs) / 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 ((be16_to_cpu(left->bb_numrecs) & 1) &&
- cur->bc_ptrs[level] <= be16_to_cpu(right->bb_numrecs) + 1)
- be16_add_cpu(&right->bb_numrecs, 1);
- i = be16_to_cpu(left->bb_numrecs) - be16_to_cpu(right->bb_numrecs) + 1;
- /*
- * For non-leaf blocks, copy keys and addresses over to the new block.
- */
- if (level > 0) {
- xfs_alloc_key_t *lkp; /* left btree key pointer */
- xfs_alloc_ptr_t *lpp; /* left btree address pointer */
- xfs_alloc_key_t *rkp; /* right btree key pointer */
- xfs_alloc_ptr_t *rpp; /* right btree address pointer */
- lkp = XFS_ALLOC_KEY_ADDR(left, i, cur);
- lpp = XFS_ALLOC_PTR_ADDR(left, i, cur);
- rkp = XFS_ALLOC_KEY_ADDR(right, 1, cur);
- rpp = XFS_ALLOC_PTR_ADDR(right, 1, cur);
- #ifdef DEBUG
- for (i = 0; i < be16_to_cpu(right->bb_numrecs); i++) {
- if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(lpp[i]), level)))
- return error;
- }
- #endif
- memcpy(rkp, lkp, be16_to_cpu(right->bb_numrecs) * sizeof(*rkp));
- memcpy(rpp, lpp, be16_to_cpu(right->bb_numrecs) * sizeof(*rpp));
- xfs_alloc_log_keys(cur, rbp, 1, be16_to_cpu(right->bb_numrecs));
- xfs_alloc_log_ptrs(cur, rbp, 1, be16_to_cpu(right->bb_numrecs));
- *keyp = *rkp;
- }
- /*
- * For leaf blocks, copy records over to the new block.
- */
- else {
- xfs_alloc_rec_t *lrp; /* left btree record pointer */
- xfs_alloc_rec_t *rrp; /* right btree record pointer */
- lrp = XFS_ALLOC_REC_ADDR(left, i, cur);
- rrp = XFS_ALLOC_REC_ADDR(right, 1, cur);
- memcpy(rrp, lrp, be16_to_cpu(right->bb_numrecs) * sizeof(*rrp));
- xfs_alloc_log_recs(cur, rbp, 1, be16_to_cpu(right->bb_numrecs));
- keyp->ar_startblock = rrp->ar_startblock;
- keyp->ar_blockcount = rrp->ar_blockcount;
- }
- /*
- * Find the left block number by looking in the buffer.
- * Adjust numrecs, sibling pointers.
- */
- lbno = XFS_DADDR_TO_AGBNO(cur->bc_mp, XFS_BUF_ADDR(lbp));
- be16_add_cpu(&left->bb_numrecs, -(be16_to_cpu(right->bb_numrecs)));
- right->bb_rightsib = left->bb_rightsib;
- left->bb_rightsib = cpu_to_be32(rbno);
- right->bb_leftsib = cpu_to_be32(lbno);
- xfs_alloc_log_block(cur->bc_tp, rbp, XFS_BB_ALL_BITS);
- xfs_alloc_log_block(cur->bc_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 (be32_to_cpu(right->bb_rightsib) != NULLAGBLOCK) {
- xfs_alloc_block_t *rrblock; /* rr btree block */
- xfs_buf_t *rrbp; /* buffer for rrblock */
- if ((error = xfs_btree_read_bufs(cur->bc_mp, cur->bc_tp,
- cur->bc_private.a.agno, be32_to_cpu(right->bb_rightsib), 0,
- &rrbp, XFS_ALLOC_BTREE_REF)))
- return error;
- rrblock = XFS_BUF_TO_ALLOC_BLOCK(rrbp);
- if ((error = xfs_btree_check_sblock(cur, rrblock, level, rrbp)))
- return error;
- rrblock->bb_leftsib = cpu_to_be32(rbno);
- xfs_alloc_log_block(cur->bc_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] > be16_to_cpu(left->bb_numrecs) + 1) {
- xfs_btree_setbuf(cur, level, rbp);
- cur->bc_ptrs[level] -= be16_to_cpu(left->bb_numrecs);
- }
- /*
- * If there are more levels, we'll need another cursor which refers to
- * 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 = rbno;
- *stat = 1;
- return 0;
- }
- /*
- * Externally visible routines.
- */
- /*
- * 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_alloc_delete(
- xfs_btree_cur_t *cur, /* btree cursor */
- int *stat) /* success/failure */
- {
- int error; /* error return value */
- 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_alloc_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_btree_decrement(cur, level, &i)))
- return error;
- break;
- }
- }
- }
- *stat = i;
- return 0;
- }
- /*
- * Get the data from the pointed-to record.
- */
- int /* error */
- xfs_alloc_get_rec(
- xfs_btree_cur_t *cur, /* btree cursor */
- xfs_agblock_t *bno, /* output: starting block of extent */
- xfs_extlen_t *len, /* output: length of extent */
- int *stat) /* output: success/failure */
- {
- xfs_alloc_block_t *block; /* btree block */
- #ifdef DEBUG
- int error; /* error return value */
- #endif
- int ptr; /* record number */
- ptr = cur->bc_ptrs[0];
- block = XFS_BUF_TO_ALLOC_BLOCK(cur->bc_bufs[0]);
- #ifdef DEBUG
- if ((error = xfs_btree_check_sblock(cur, block, 0, cur->bc_bufs[0])))
- return error;
- #endif
- /*
- * Off the right end or left end, return failure.
- */
- if (ptr > be16_to_cpu(block->bb_numrecs) || ptr <= 0) {
- *stat = 0;
- return 0;
- }
- /*
- * Point to the record and extract its data.
- */
- {
- xfs_alloc_rec_t *rec; /* record data */
- rec = XFS_ALLOC_REC_ADDR(block, ptr, cur);
- *bno = be32_to_cpu(rec->ar_startblock);
- *len = be32_to_cpu(rec->ar_blockcount);
- }
- *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_alloc_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_alloc_rec_t nrec; /* record being inserted this level */
- xfs_btree_cur_t *pcur; /* previous level's cursor */
- level = 0;
- nbno = NULLAGBLOCK;
- nrec.ar_startblock = cpu_to_be32(cur->bc_rec.a.ar_startblock);
- nrec.ar_blockcount = cpu_to_be32(cur->bc_rec.a.ar_blockcount);
- ncur = NULL;
- 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_alloc_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 = NULL;
- }
- } while (nbno != NULLAGBLOCK);
- *stat = i;
- return 0;
- }
- /*
- * Update the record referred to by cur, to the value given by [bno, len].
- * This either works (return 0) or gets an EFSCORRUPTED error.
- */
- int /* error */
- xfs_alloc_update(
- xfs_btree_cur_t *cur, /* btree cursor */
- xfs_agblock_t bno, /* starting block of extent */
- xfs_extlen_t len) /* length of extent */
- {
- xfs_alloc_block_t *block; /* btree block to update */
- int error; /* error return value */
- int ptr; /* current record number (updating) */
- ASSERT(len > 0);
- /*
- * Pick up the a.g. freelist struct and the current block.
- */
- block = XFS_BUF_TO_ALLOC_BLOCK(cur->bc_bufs[0]);
- #ifdef DEBUG
- if ((error = xfs_btree_check_sblock(cur, block, 0, cur->bc_bufs[0])))
- return error;
- #endif
- /*
- * Get the address of the rec to be updated.
- */
- ptr = cur->bc_ptrs[0];
- {
- xfs_alloc_rec_t *rp; /* pointer to updated record */
- rp = XFS_ALLOC_REC_ADDR(block, ptr, cur);
- /*
- * Fill in the new contents and log them.
- */
- rp->ar_startblock = cpu_to_be32(bno);
- rp->ar_blockcount = cpu_to_be32(len);
- xfs_alloc_log_recs(cur, cur->bc_bufs[0], ptr, ptr);
- }
- /*
- * If it's the by-size btree and it's the last leaf block and
- * it's the last record... then update the size of the longest
- * extent in the a.g., which we cache in the a.g. freelist header.
- */
- if (cur->bc_btnum == XFS_BTNUM_CNT &&
- be32_to_cpu(block->bb_rightsib) == NULLAGBLOCK &&
- ptr == be16_to_cpu(block->bb_numrecs)) {
- xfs_agf_t *agf; /* a.g. freespace header */
- xfs_agnumber_t seqno;
- agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
- seqno = be32_to_cpu(agf->agf_seqno);
- cur->bc_mp->m_perag[seqno].pagf_longest = len;
- agf->agf_longest = cpu_to_be32(len);
- xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp,
- XFS_AGF_LONGEST);
- }
- /*
- * Updating first record in leaf. Pass new key value up to our parent.
- */
- if (ptr == 1) {
- xfs_alloc_key_t key; /* key containing [bno, len] */
- key.ar_startblock = cpu_to_be32(bno);
- key.ar_blockcount = cpu_to_be32(len);
- if ((error = xfs_btree_updkey(cur, (union xfs_btree_key *)&key, 1)))
- return error;
- }
- return 0;
- }
- STATIC struct xfs_btree_cur *
- xfs_allocbt_dup_cursor(
- struct xfs_btree_cur *cur)
- {
- return xfs_allocbt_init_cursor(cur->bc_mp, cur->bc_tp,
- cur->bc_private.a.agbp, cur->bc_private.a.agno,
- cur->bc_btnum);
- }
- STATIC int
- xfs_allocbt_get_maxrecs(
- struct xfs_btree_cur *cur,
- int level)
- {
- return cur->bc_mp->m_alloc_mxr[level != 0];
- }
- STATIC void
- xfs_allocbt_init_key_from_rec(
- union xfs_btree_key *key,
- union xfs_btree_rec *rec)
- {
- ASSERT(rec->alloc.ar_startblock != 0);
- key->alloc.ar_startblock = rec->alloc.ar_startblock;
- key->alloc.ar_blockcount = rec->alloc.ar_blockcount;
- }
- STATIC void
- xfs_allocbt_init_ptr_from_cur(
- struct xfs_btree_cur *cur,
- union xfs_btree_ptr *ptr)
- {
- struct xfs_agf *agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
- ASSERT(cur->bc_private.a.agno == be32_to_cpu(agf->agf_seqno));
- ASSERT(agf->agf_roots[cur->bc_btnum] != 0);
- ptr->s = agf->agf_roots[cur->bc_btnum];
- }
- STATIC __int64_t
- xfs_allocbt_key_diff(
- struct xfs_btree_cur *cur,
- union xfs_btree_key *key)
- {
- xfs_alloc_rec_incore_t *rec = &cur->bc_rec.a;
- xfs_alloc_key_t *kp = &key->alloc;
- __int64_t diff;
- if (cur->bc_btnum == XFS_BTNUM_BNO) {
- return (__int64_t)be32_to_cpu(kp->ar_startblock) -
- rec->ar_startblock;
- }
- diff = (__int64_t)be32_to_cpu(kp->ar_blockcount) - rec->ar_blockcount;
- if (diff)
- return diff;
- return (__int64_t)be32_to_cpu(kp->ar_startblock) - rec->ar_startblock;
- }
- #ifdef XFS_BTREE_TRACE
- ktrace_t *xfs_allocbt_trace_buf;
- STATIC void
- xfs_allocbt_trace_enter(
- struct xfs_btree_cur *cur,
- const char *func,
- char *s,
- int type,
- int line,
- __psunsigned_t a0,
- __psunsigned_t a1,
- __psunsigned_t a2,
- __psunsigned_t a3,
- __psunsigned_t a4,
- __psunsigned_t a5,
- __psunsigned_t a6,
- __psunsigned_t a7,
- __psunsigned_t a8,
- __psunsigned_t a9,
- __psunsigned_t a10)
- {
- ktrace_enter(xfs_allocbt_trace_buf, (void *)(__psint_t)type,
- (void *)func, (void *)s, NULL, (void *)cur,
- (void *)a0, (void *)a1, (void *)a2, (void *)a3,
- (void *)a4, (void *)a5, (void *)a6, (void *)a7,
- (void *)a8, (void *)a9, (void *)a10);
- }
- STATIC void
- xfs_allocbt_trace_cursor(
- struct xfs_btree_cur *cur,
- __uint32_t *s0,
- __uint64_t *l0,
- __uint64_t *l1)
- {
- *s0 = cur->bc_private.a.agno;
- *l0 = cur->bc_rec.a.ar_startblock;
- *l1 = cur->bc_rec.a.ar_blockcount;
- }
- STATIC void
- xfs_allocbt_trace_key(
- struct xfs_btree_cur *cur,
- union xfs_btree_key *key,
- __uint64_t *l0,
- __uint64_t *l1)
- {
- *l0 = be32_to_cpu(key->alloc.ar_startblock);
- *l1 = be32_to_cpu(key->alloc.ar_blockcount);
- }
- STATIC void
- xfs_allocbt_trace_record(
- struct xfs_btree_cur *cur,
- union xfs_btree_rec *rec,
- __uint64_t *l0,
- __uint64_t *l1,
- __uint64_t *l2)
- {
- *l0 = be32_to_cpu(rec->alloc.ar_startblock);
- *l1 = be32_to_cpu(rec->alloc.ar_blockcount);
- *l2 = 0;
- }
- #endif /* XFS_BTREE_TRACE */
- static const struct xfs_btree_ops xfs_allocbt_ops = {
- .rec_len = sizeof(xfs_alloc_rec_t),
- .key_len = sizeof(xfs_alloc_key_t),
- .dup_cursor = xfs_allocbt_dup_cursor,
- .get_maxrecs = xfs_allocbt_get_maxrecs,
- .init_key_from_rec = xfs_allocbt_init_key_from_rec,
- .init_ptr_from_cur = xfs_allocbt_init_ptr_from_cur,
- .key_diff = xfs_allocbt_key_diff,
- #ifdef XFS_BTREE_TRACE
- .trace_enter = xfs_allocbt_trace_enter,
- .trace_cursor = xfs_allocbt_trace_cursor,
- .trace_key = xfs_allocbt_trace_key,
- .trace_record = xfs_allocbt_trace_record,
- #endif
- };
- /*
- * Allocate a new allocation btree cursor.
- */
- struct xfs_btree_cur * /* new alloc btree cursor */
- xfs_allocbt_init_cursor(
- struct xfs_mount *mp, /* file system mount point */
- struct xfs_trans *tp, /* transaction pointer */
- struct xfs_buf *agbp, /* buffer for agf structure */
- xfs_agnumber_t agno, /* allocation group number */
- xfs_btnum_t btnum) /* btree identifier */
- {
- struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
- struct xfs_btree_cur *cur;
- ASSERT(btnum == XFS_BTNUM_BNO || btnum == XFS_BTNUM_CNT);
- cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
- cur->bc_tp = tp;
- cur->bc_mp = mp;
- cur->bc_nlevels = be32_to_cpu(agf->agf_levels[btnum]);
- cur->bc_btnum = btnum;
- cur->bc_blocklog = mp->m_sb.sb_blocklog;
- cur->bc_ops = &xfs_allocbt_ops;
- cur->bc_private.a.agbp = agbp;
- cur->bc_private.a.agno = agno;
- return cur;
- }
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