#include "xfs_alloc.h"
#include "xfs_error.h"
-STATIC void xfs_inobt_log_block(xfs_trans_t *, xfs_buf_t *, int);
-STATIC void xfs_inobt_log_keys(xfs_btree_cur_t *, xfs_buf_t *, int, int);
-STATIC void xfs_inobt_log_ptrs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
-STATIC void xfs_inobt_log_recs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
-/*
- * Single level of the xfs_inobt_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_inobt_delrec(
- xfs_btree_cur_t *cur, /* btree cursor */
- int level, /* level removing record from */
- int *stat) /* fail/done/go-on */
-{
- xfs_buf_t *agbp; /* buffer for a.g. inode header */
- xfs_mount_t *mp; /* mount structure */
- xfs_agi_t *agi; /* allocation group inode header */
- xfs_inobt_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_inobt_key_t key; /* kp points here if block is level 0 */
- xfs_inobt_key_t *kp = NULL; /* pointer to btree keys */
- xfs_agblock_t lbno; /* left block's block number */
- xfs_buf_t *lbp; /* left block's buffer pointer */
- xfs_inobt_block_t *left; /* left btree block */
- xfs_inobt_key_t *lkp; /* left block key pointer */
- xfs_inobt_ptr_t *lpp; /* left block address pointer */
- int lrecs = 0; /* number of records in left block */
- xfs_inobt_rec_t *lrp; /* left block record pointer */
- xfs_inobt_ptr_t *pp = NULL; /* pointer to btree addresses */
- 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_inobt_block_t *right; /* right btree block */
- xfs_inobt_key_t *rkp; /* right block key pointer */
- xfs_inobt_rec_t *rp; /* pointer to btree records */
- xfs_inobt_ptr_t *rpp; /* right block address pointer */
- int rrecs = 0; /* number of records in right block */
- int numrecs;
- xfs_inobt_rec_t *rrp; /* right block record pointer */
- xfs_btree_cur_t *tcur; /* temporary btree cursor */
-
- mp = cur->bc_mp;
-
- /*
- * 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_INOBT_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;
- }
- /*
- * 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) {
- kp = XFS_INOBT_KEY_ADDR(block, 1, cur);
- pp = XFS_INOBT_PTR_ADDR(block, 1, cur);
-#ifdef DEBUG
- for (i = ptr; i < numrecs; i++) {
- if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(pp[i]), level)))
- return error;
- }
-#endif
- if (ptr < numrecs) {
- memmove(&kp[ptr - 1], &kp[ptr],
- (numrecs - ptr) * sizeof(*kp));
- memmove(&pp[ptr - 1], &pp[ptr],
- (numrecs - ptr) * sizeof(*kp));
- xfs_inobt_log_keys(cur, bp, ptr, numrecs - 1);
- xfs_inobt_log_ptrs(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 {
- rp = XFS_INOBT_REC_ADDR(block, 1, cur);
- if (ptr < numrecs) {
- memmove(&rp[ptr - 1], &rp[ptr],
- (numrecs - ptr) * sizeof(*rp));
- xfs_inobt_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.ir_startino = rp->ir_startino;
- kp = &key;
- }
- }
- /*
- * Decrement and log the number of entries in the block.
- */
- numrecs--;
- block->bb_numrecs = cpu_to_be16(numrecs);
- xfs_inobt_log_block(cur->bc_tp, bp, XFS_BB_NUMRECS);
- /*
- * 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) {
- agbp = cur->bc_private.a.agbp;
- agi = XFS_BUF_TO_AGI(agbp);
- /*
- * pp is still set to the first pointer in the block.
- * Make it the new root of the btree.
- */
- bno = be32_to_cpu(agi->agi_root);
- agi->agi_root = *pp;
- be32_add_cpu(&agi->agi_level, -1);
- /*
- * Free the block.
- */
- if ((error = xfs_free_extent(cur->bc_tp,
- XFS_AGB_TO_FSB(mp, cur->bc_private.a.agno, bno), 1)))
- return error;
- xfs_trans_binval(cur->bc_tp, bp);
- xfs_ialloc_log_agi(cur->bc_tp, agbp,
- XFS_AGI_ROOT | XFS_AGI_LEVEL);
- /*
- * Update the cursor so there's one fewer level.
- */
- cur->bc_bufs[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 *)kp, level + 1)))
- return error;
- /*
- * If the number of records remaining in the block is at least
- * the minimum, we're done.
- */
- if (numrecs >= XFS_INOBT_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_INOBT_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_INOBT_BLOCK_MINRECS(level, cur)) {
- if ((error = xfs_btree_lshift(tcur, level, &i)))
- goto error0;
- if (i) {
- ASSERT(be16_to_cpu(block->bb_numrecs) >=
- XFS_INOBT_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) {
- xfs_btree_firstrec(tcur, level);
- if ((error = xfs_btree_decrement(tcur, level, &i)))
- goto 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.
- */
- xfs_btree_firstrec(tcur, level);
- if ((error = xfs_btree_decrement(tcur, level, &i)))
- goto error0;
- xfs_btree_firstrec(tcur, level);
- /*
- * Grab a pointer to the block.
- */
- lbp = tcur->bc_bufs[level];
- left = XFS_BUF_TO_INOBT_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_INOBT_BLOCK_MINRECS(level, cur)) {
- if ((error = xfs_btree_rshift(tcur, level, &i)))
- goto error0;
- if (i) {
- ASSERT(be16_to_cpu(block->bb_numrecs) >=
- XFS_INOBT_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_INOBT_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_INO_BTREE_REF)))
- return error;
- left = XFS_BUF_TO_INOBT_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_INOBT_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_INO_BTREE_REF)))
- return error;
- right = XFS_BUF_TO_INOBT_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_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, be32_to_cpu(rpp[i]), 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_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_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 (be32_to_cpu(left->bb_rightsib) != NULLAGBLOCK) {
- xfs_inobt_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_INO_BTREE_REF)))
- return error;
- rrblock = XFS_BUF_TO_INOBT_BLOCK(rrbp);
- if ((error = xfs_btree_check_sblock(cur, rrblock, level, rrbp)))
- return error;
- rrblock->bb_leftsib = cpu_to_be32(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.a.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 */
-
- /*
- * 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) {
- error = xfs_btree_new_root(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;
- 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 = 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_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 = NULL;
- /*
- * 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_btree_rshift(cur, level, &i)))
- return error;
- if (i) {
- /* nothing */
- }
- /*
- * Next, try shifting an entry to the left neighbor.
- */
- else {
- if ((error = xfs_btree_lshift(cur, level, &i)))
- return error;
- if (i) {
- optr = ptr = cur->bc_ptrs[level];
- } else {
- union xfs_btree_ptr bno = { .s = cpu_to_be32(nbno) };
- /*
- * 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_btree_split(cur, level, &bno,
- (union xfs_btree_key *)&nkey,
- &ncur, &i)))
- return error;
- nbno = be32_to_cpu(bno.s);
- 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;
- } 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 = 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_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, 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));
- /*
- * 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;
- pp[ptr - 1] = cpu_to_be32(*bnop);
- numrecs++;
- block->bb_numrecs = cpu_to_be16(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;
- numrecs++;
- block->bb_numrecs = cpu_to_be16(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_btree_updkey(cur, (union xfs_btree_key *)&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;
- *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);
-}
-
-
-/*
- * 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_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_btree_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 > be16_to_cpu(block->bb_numrecs) || ptr <= 0) {
- *stat = 0;
- return 0;
- }
- /*
- * Point to the record and extract its data.
- */
- rec = XFS_INOBT_REC_ADDR(block, ptr, cur);
- *ino = be32_to_cpu(rec->ir_startino);
- *fcnt = be32_to_cpu(rec->ir_freecount);
- *free = be64_to_cpu(rec->ir_free);
- *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 */
+STATIC int
+xfs_inobt_get_minrecs(
+ struct xfs_btree_cur *cur,
+ int level)
{
- 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;
- nrec.ir_startino = cpu_to_be32(cur->bc_rec.i.ir_startino);
- nrec.ir_freecount = cpu_to_be32(cur->bc_rec.i.ir_freecount);
- nrec.ir_free = cpu_to_be64(cur->bc_rec.i.ir_free);
- 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_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 = NULL;
- }
- } while (nbno != NULLAGBLOCK);
- *stat = i;
- return 0;
+ return cur->bc_mp->m_inobt_mnr[level != 0];
}
STATIC struct xfs_btree_cur *
return 0;
}
+STATIC int
+xfs_inobt_free_block(
+ struct xfs_btree_cur *cur,
+ struct xfs_buf *bp)
+{
+ xfs_fsblock_t fsbno;
+ int error;
+
+ fsbno = XFS_DADDR_TO_FSB(cur->bc_mp, XFS_BUF_ADDR(bp));
+ error = xfs_free_extent(cur->bc_tp, fsbno, 1);
+ if (error)
+ return error;
+
+ xfs_trans_binval(cur->bc_tp, bp);
+ return error;
+}
STATIC int
xfs_inobt_get_maxrecs(
key->inobt.ir_startino = rec->inobt.ir_startino;
}
+STATIC void
+xfs_inobt_init_rec_from_key(
+ union xfs_btree_key *key,
+ union xfs_btree_rec *rec)
+{
+ rec->inobt.ir_startino = key->inobt.ir_startino;
+}
+
+STATIC void
+xfs_inobt_init_rec_from_cur(
+ struct xfs_btree_cur *cur,
+ union xfs_btree_rec *rec)
+{
+ rec->inobt.ir_startino = cpu_to_be32(cur->bc_rec.i.ir_startino);
+ rec->inobt.ir_freecount = cpu_to_be32(cur->bc_rec.i.ir_freecount);
+ rec->inobt.ir_free = cpu_to_be64(cur->bc_rec.i.ir_free);
+}
+
/*
* intial value of ptr for lookup
*/
cur->bc_rec.i.ir_startino;
}
+STATIC int
+xfs_inobt_kill_root(
+ struct xfs_btree_cur *cur,
+ struct xfs_buf *bp,
+ int level,
+ union xfs_btree_ptr *newroot)
+{
+ int error;
+
+ XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
+ XFS_BTREE_STATS_INC(cur, killroot);
+
+ /*
+ * Update the root pointer, decreasing the level by 1 and then
+ * free the old root.
+ */
+ xfs_inobt_set_root(cur, newroot, -1);
+ error = xfs_inobt_free_block(cur, bp);
+ if (error) {
+ XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
+ return error;
+ }
+
+ XFS_BTREE_STATS_INC(cur, free);
+
+ cur->bc_bufs[level] = NULL;
+ cur->bc_nlevels--;
+
+ XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
+ return 0;
+}
+
+#ifdef DEBUG
+STATIC int
+xfs_inobt_keys_inorder(
+ struct xfs_btree_cur *cur,
+ union xfs_btree_key *k1,
+ union xfs_btree_key *k2)
+{
+ return be32_to_cpu(k1->inobt.ir_startino) <
+ be32_to_cpu(k2->inobt.ir_startino);
+}
+
+STATIC int
+xfs_inobt_recs_inorder(
+ struct xfs_btree_cur *cur,
+ union xfs_btree_rec *r1,
+ union xfs_btree_rec *r2)
+{
+ return be32_to_cpu(r1->inobt.ir_startino) + XFS_INODES_PER_CHUNK <=
+ be32_to_cpu(r2->inobt.ir_startino);
+}
+#endif /* DEBUG */
+
#ifdef XFS_BTREE_TRACE
ktrace_t *xfs_inobt_trace_buf;
.dup_cursor = xfs_inobt_dup_cursor,
.set_root = xfs_inobt_set_root,
+ .kill_root = xfs_inobt_kill_root,
.alloc_block = xfs_inobt_alloc_block,
+ .free_block = xfs_inobt_free_block,
+ .get_minrecs = xfs_inobt_get_minrecs,
.get_maxrecs = xfs_inobt_get_maxrecs,
.init_key_from_rec = xfs_inobt_init_key_from_rec,
+ .init_rec_from_key = xfs_inobt_init_rec_from_key,
+ .init_rec_from_cur = xfs_inobt_init_rec_from_cur,
.init_ptr_from_cur = xfs_inobt_init_ptr_from_cur,
.key_diff = xfs_inobt_key_diff,
+#ifdef DEBUG
+ .keys_inorder = xfs_inobt_keys_inorder,
+ .recs_inorder = xfs_inobt_recs_inorder,
+#endif
+
#ifdef XFS_BTREE_TRACE
.trace_enter = xfs_inobt_trace_enter,
.trace_cursor = xfs_inobt_trace_cursor,
return cur;
}
+
+/*
+ * Calculate number of records in an inobt btree block.
+ */
+int
+xfs_inobt_maxrecs(
+ struct xfs_mount *mp,
+ int blocklen,
+ int leaf)
+{
+ blocklen -= XFS_INOBT_BLOCK_LEN(mp);
+
+ if (leaf)
+ return blocklen / sizeof(xfs_inobt_rec_t);
+ return blocklen / (sizeof(xfs_inobt_key_t) + sizeof(xfs_inobt_ptr_t));
+}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff