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[XFS] implement generic xfs_btree_rshift
Make the btree right shift code generic. Based on a patch from David Chinner with lots of changes to follow the original btree implementations more closely. While this loses some of the generic helper routines for inserting/moving/removing records it also solves some of the one off bugs in the original code and makes it easier to verify. SGI-PV: 985583 SGI-Modid: xfs-linux-melb:xfs-kern:32196a Signed-off-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com> Signed-off-by: Bill O'Donnell <billodo@sgi.com> Signed-off-by: David Chinner <david@fromorbit.com>
This commit is contained in:
Christoph Hellwig
Lachlan McIlroy
parent
278d0ca14e
commit
9eaead51be
@ -49,7 +49,6 @@ STATIC void xfs_alloc_log_ptrs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
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STATIC void xfs_alloc_log_recs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
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STATIC int xfs_alloc_lshift(xfs_btree_cur_t *, int, int *);
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STATIC int xfs_alloc_newroot(xfs_btree_cur_t *, int *);
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STATIC int xfs_alloc_rshift(xfs_btree_cur_t *, int, int *);
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STATIC int xfs_alloc_split(xfs_btree_cur_t *, int, xfs_agblock_t *,
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xfs_alloc_key_t *, xfs_btree_cur_t **, int *);
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@ -391,7 +390,7 @@ xfs_alloc_delrec(
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*/
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if (be16_to_cpu(left->bb_numrecs) - 1 >=
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XFS_ALLOC_BLOCK_MINRECS(level, cur)) {
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if ((error = xfs_alloc_rshift(tcur, level, &i)))
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if ((error = xfs_btree_rshift(tcur, level, &i)))
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goto error0;
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if (i) {
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ASSERT(be16_to_cpu(block->bb_numrecs) >=
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@ -683,7 +682,7 @@ xfs_alloc_insrec(
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/*
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* First, try shifting an entry to the right neighbor.
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*/
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if ((error = xfs_alloc_rshift(cur, level, &i)))
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if ((error = xfs_btree_rshift(cur, level, &i)))
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return error;
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if (i) {
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/* nothing */
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@ -1232,137 +1231,6 @@ xfs_alloc_newroot(
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return 0;
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}
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/*
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* Move 1 record right from cur/level if possible.
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* Update cur to reflect the new path.
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*/
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STATIC int /* error */
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xfs_alloc_rshift(
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xfs_btree_cur_t *cur, /* btree cursor */
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int level, /* level to shift record on */
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int *stat) /* success/failure */
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{
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int error; /* error return value */
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int i; /* loop index */
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xfs_alloc_key_t key; /* key value for leaf level upward */
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xfs_buf_t *lbp; /* buffer for left (current) block */
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xfs_alloc_block_t *left; /* left (current) btree block */
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xfs_buf_t *rbp; /* buffer for right neighbor block */
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xfs_alloc_block_t *right; /* right neighbor btree block */
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xfs_alloc_key_t *rkp; /* key pointer for right block */
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xfs_btree_cur_t *tcur; /* temporary cursor */
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/*
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* Set up variables for this block as "left".
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*/
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lbp = cur->bc_bufs[level];
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left = XFS_BUF_TO_ALLOC_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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return error;
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#endif
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/*
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* If we've got no right sibling then we can't shift an entry right.
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*/
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if (be32_to_cpu(left->bb_rightsib) == NULLAGBLOCK) {
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*stat = 0;
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return 0;
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}
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/*
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* If the cursor entry is the one that would be moved, don't
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* do it... it's too complicated.
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*/
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if (cur->bc_ptrs[level] >= be16_to_cpu(left->bb_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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* Set up the right neighbor as "right".
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*/
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if ((error = xfs_btree_read_bufs(cur->bc_mp, cur->bc_tp,
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cur->bc_private.a.agno, be32_to_cpu(left->bb_rightsib),
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0, &rbp, XFS_ALLOC_BTREE_REF)))
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return error;
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right = XFS_BUF_TO_ALLOC_BLOCK(rbp);
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if ((error = xfs_btree_check_sblock(cur, right, level, rbp)))
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return error;
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/*
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* If it's full, it can't take another entry.
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*/
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if (be16_to_cpu(right->bb_numrecs) == XFS_ALLOC_BLOCK_MAXRECS(level, cur)) {
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*stat = 0;
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return 0;
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}
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/*
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* Make a hole at the start of the right neighbor block, then
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* copy the last left block entry to the hole.
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*/
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if (level > 0) {
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xfs_alloc_key_t *lkp; /* key pointer for left block */
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xfs_alloc_ptr_t *lpp; /* address pointer for left block */
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xfs_alloc_ptr_t *rpp; /* address pointer for right block */
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lkp = XFS_ALLOC_KEY_ADDR(left, be16_to_cpu(left->bb_numrecs), cur);
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lpp = XFS_ALLOC_PTR_ADDR(left, be16_to_cpu(left->bb_numrecs), cur);
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rkp = XFS_ALLOC_KEY_ADDR(right, 1, cur);
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rpp = XFS_ALLOC_PTR_ADDR(right, 1, cur);
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#ifdef DEBUG
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for (i = be16_to_cpu(right->bb_numrecs) - 1; i >= 0; i--) {
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if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(rpp[i]), level)))
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return error;
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}
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#endif
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memmove(rkp + 1, rkp, be16_to_cpu(right->bb_numrecs) * sizeof(*rkp));
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memmove(rpp + 1, rpp, be16_to_cpu(right->bb_numrecs) * sizeof(*rpp));
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#ifdef DEBUG
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if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(*lpp), level)))
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return error;
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#endif
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*rkp = *lkp;
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*rpp = *lpp;
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xfs_alloc_log_keys(cur, rbp, 1, be16_to_cpu(right->bb_numrecs) + 1);
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xfs_alloc_log_ptrs(cur, rbp, 1, be16_to_cpu(right->bb_numrecs) + 1);
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xfs_btree_check_key(cur->bc_btnum, rkp, rkp + 1);
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} else {
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xfs_alloc_rec_t *lrp; /* record pointer for left block */
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xfs_alloc_rec_t *rrp; /* record pointer for right block */
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lrp = XFS_ALLOC_REC_ADDR(left, be16_to_cpu(left->bb_numrecs), cur);
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rrp = XFS_ALLOC_REC_ADDR(right, 1, cur);
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memmove(rrp + 1, rrp, be16_to_cpu(right->bb_numrecs) * sizeof(*rrp));
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*rrp = *lrp;
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xfs_alloc_log_recs(cur, rbp, 1, be16_to_cpu(right->bb_numrecs) + 1);
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key.ar_startblock = rrp->ar_startblock;
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key.ar_blockcount = rrp->ar_blockcount;
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rkp = &key;
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xfs_btree_check_rec(cur->bc_btnum, rrp, rrp + 1);
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}
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/*
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* Decrement and log left's numrecs, bump and log right's numrecs.
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*/
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be16_add_cpu(&left->bb_numrecs, -1);
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xfs_alloc_log_block(cur->bc_tp, lbp, XFS_BB_NUMRECS);
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be16_add_cpu(&right->bb_numrecs, 1);
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xfs_alloc_log_block(cur->bc_tp, rbp, XFS_BB_NUMRECS);
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/*
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* Using a temporary cursor, update the parent key values of the
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* block on the right.
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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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i = xfs_btree_lastrec(tcur, level);
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XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
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if ((error = xfs_btree_increment(tcur, level, &i)) ||
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(error = xfs_btree_updkey(tcur, (union xfs_btree_key *)rkp, level + 1)))
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goto error0;
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xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
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*stat = 1;
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return 0;
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error0:
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xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR);
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return error;
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}
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/*
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* Split cur/level block in half.
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* Return new block number and its first record (to be inserted into parent).
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@ -53,7 +53,6 @@ STATIC int xfs_bmbt_killroot(xfs_btree_cur_t *);
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STATIC void xfs_bmbt_log_keys(xfs_btree_cur_t *, xfs_buf_t *, int, int);
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STATIC void xfs_bmbt_log_ptrs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
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STATIC int xfs_bmbt_lshift(xfs_btree_cur_t *, int, int *);
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STATIC int xfs_bmbt_rshift(xfs_btree_cur_t *, int, int *);
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STATIC int xfs_bmbt_split(xfs_btree_cur_t *, int, xfs_fsblock_t *,
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__uint64_t *, xfs_btree_cur_t **, int *);
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@ -327,7 +326,7 @@ xfs_bmbt_delrec(
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bno = be64_to_cpu(left->bb_rightsib);
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if (be16_to_cpu(left->bb_numrecs) - 1 >=
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XFS_BMAP_BLOCK_IMINRECS(level, cur)) {
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if ((error = xfs_bmbt_rshift(tcur, level, &i))) {
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if ((error = xfs_btree_rshift(tcur, level, &i))) {
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XFS_BMBT_TRACE_CURSOR(cur, ERROR);
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goto error0;
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}
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@ -538,7 +537,7 @@ xfs_bmbt_insrec(
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logflags);
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block = xfs_bmbt_get_block(cur, level, &bp);
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} else {
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if ((error = xfs_bmbt_rshift(cur, level, &i))) {
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if ((error = xfs_btree_rshift(cur, level, &i))) {
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XFS_BMBT_TRACE_CURSOR(cur, ERROR);
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return error;
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}
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@ -944,143 +943,6 @@ xfs_bmbt_lshift(
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return 0;
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}
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/*
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* Move 1 record right from cur/level if possible.
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* Update cur to reflect the new path.
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*/
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STATIC int /* error */
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xfs_bmbt_rshift(
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xfs_btree_cur_t *cur,
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int level,
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int *stat) /* success/failure */
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{
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int error; /* error return value */
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int i; /* loop counter */
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xfs_bmbt_key_t key; /* bmap btree key */
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xfs_buf_t *lbp; /* left buffer pointer */
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xfs_bmbt_block_t *left; /* left btree block */
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xfs_bmbt_key_t *lkp; /* left btree key */
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xfs_bmbt_ptr_t *lpp; /* left address pointer */
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xfs_bmbt_rec_t *lrp; /* left record pointer */
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xfs_mount_t *mp; /* file system mount point */
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xfs_buf_t *rbp; /* right buffer pointer */
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xfs_bmbt_block_t *right; /* right btree block */
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xfs_bmbt_key_t *rkp; /* right btree key */
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xfs_bmbt_ptr_t *rpp; /* right address pointer */
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xfs_bmbt_rec_t *rrp=NULL; /* right record pointer */
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struct xfs_btree_cur *tcur; /* temporary btree cursor */
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XFS_BMBT_TRACE_CURSOR(cur, ENTRY);
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XFS_BMBT_TRACE_ARGI(cur, level);
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if (level == cur->bc_nlevels - 1) {
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XFS_BMBT_TRACE_CURSOR(cur, EXIT);
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*stat = 0;
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return 0;
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}
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lbp = cur->bc_bufs[level];
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left = XFS_BUF_TO_BMBT_BLOCK(lbp);
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#ifdef DEBUG
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if ((error = xfs_btree_check_lblock(cur, left, level, lbp))) {
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XFS_BMBT_TRACE_CURSOR(cur, ERROR);
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return error;
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}
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#endif
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if (be64_to_cpu(left->bb_rightsib) == NULLDFSBNO) {
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XFS_BMBT_TRACE_CURSOR(cur, EXIT);
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*stat = 0;
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return 0;
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}
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if (cur->bc_ptrs[level] >= be16_to_cpu(left->bb_numrecs)) {
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XFS_BMBT_TRACE_CURSOR(cur, EXIT);
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*stat = 0;
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return 0;
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}
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mp = cur->bc_mp;
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if ((error = xfs_btree_read_bufl(mp, cur->bc_tp, be64_to_cpu(left->bb_rightsib), 0,
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&rbp, XFS_BMAP_BTREE_REF))) {
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XFS_BMBT_TRACE_CURSOR(cur, ERROR);
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return error;
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}
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right = XFS_BUF_TO_BMBT_BLOCK(rbp);
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if ((error = xfs_btree_check_lblock(cur, right, level, rbp))) {
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XFS_BMBT_TRACE_CURSOR(cur, ERROR);
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return error;
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}
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if (be16_to_cpu(right->bb_numrecs) == XFS_BMAP_BLOCK_IMAXRECS(level, cur)) {
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XFS_BMBT_TRACE_CURSOR(cur, EXIT);
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*stat = 0;
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return 0;
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}
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if (level > 0) {
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lkp = XFS_BMAP_KEY_IADDR(left, be16_to_cpu(left->bb_numrecs), cur);
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lpp = XFS_BMAP_PTR_IADDR(left, be16_to_cpu(left->bb_numrecs), cur);
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rkp = XFS_BMAP_KEY_IADDR(right, 1, cur);
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rpp = XFS_BMAP_PTR_IADDR(right, 1, cur);
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#ifdef DEBUG
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for (i = be16_to_cpu(right->bb_numrecs) - 1; i >= 0; i--) {
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if ((error = xfs_btree_check_lptr_disk(cur, rpp[i], level))) {
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XFS_BMBT_TRACE_CURSOR(cur, ERROR);
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return error;
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}
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}
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#endif
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memmove(rkp + 1, rkp, be16_to_cpu(right->bb_numrecs) * sizeof(*rkp));
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memmove(rpp + 1, rpp, be16_to_cpu(right->bb_numrecs) * sizeof(*rpp));
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#ifdef DEBUG
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if ((error = xfs_btree_check_lptr_disk(cur, *lpp, level))) {
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XFS_BMBT_TRACE_CURSOR(cur, ERROR);
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return error;
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}
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#endif
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*rkp = *lkp;
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*rpp = *lpp;
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xfs_bmbt_log_keys(cur, rbp, 1, be16_to_cpu(right->bb_numrecs) + 1);
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xfs_bmbt_log_ptrs(cur, rbp, 1, be16_to_cpu(right->bb_numrecs) + 1);
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} else {
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lrp = XFS_BMAP_REC_IADDR(left, be16_to_cpu(left->bb_numrecs), cur);
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rrp = XFS_BMAP_REC_IADDR(right, 1, cur);
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memmove(rrp + 1, rrp, be16_to_cpu(right->bb_numrecs) * sizeof(*rrp));
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*rrp = *lrp;
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xfs_bmbt_log_recs(cur, rbp, 1, be16_to_cpu(right->bb_numrecs) + 1);
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key.br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(rrp));
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rkp = &key;
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}
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be16_add_cpu(&left->bb_numrecs, -1);
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xfs_bmbt_log_block(cur, lbp, XFS_BB_NUMRECS);
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be16_add_cpu(&right->bb_numrecs, 1);
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#ifdef DEBUG
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if (level > 0)
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xfs_btree_check_key(XFS_BTNUM_BMAP, rkp, rkp + 1);
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else
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xfs_btree_check_rec(XFS_BTNUM_BMAP, rrp, rrp + 1);
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#endif
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xfs_bmbt_log_block(cur, rbp, XFS_BB_NUMRECS);
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if ((error = xfs_btree_dup_cursor(cur, &tcur))) {
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XFS_BMBT_TRACE_CURSOR(cur, ERROR);
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return error;
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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_btree_increment(tcur, level, &i))) {
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XFS_BMBT_TRACE_CURSOR(tcur, ERROR);
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goto error1;
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}
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XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
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if ((error = xfs_btree_updkey(tcur, (union xfs_btree_key *)rkp, level + 1))) {
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XFS_BMBT_TRACE_CURSOR(tcur, ERROR);
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goto error1;
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}
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xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
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XFS_BMBT_TRACE_CURSOR(cur, EXIT);
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*stat = 1;
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return 0;
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error0:
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XFS_BMBT_TRACE_CURSOR(cur, ERROR);
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error1:
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xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR);
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return error;
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}
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/*
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* Determine the extent state.
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*/
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@ -1117,6 +1117,77 @@ xfs_btree_copy_recs(
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memcpy(dst_rec, src_rec, numrecs * cur->bc_ops->rec_len);
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}
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/*
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* Copy block pointers from one btree block to another.
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*/
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STATIC void
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xfs_btree_copy_ptrs(
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struct xfs_btree_cur *cur,
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union xfs_btree_ptr *dst_ptr,
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union xfs_btree_ptr *src_ptr,
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int numptrs)
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{
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ASSERT(numptrs >= 0);
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memcpy(dst_ptr, src_ptr, numptrs * xfs_btree_ptr_len(cur));
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}
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/*
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* Shift keys one index left/right inside a single btree block.
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*/
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STATIC void
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xfs_btree_shift_keys(
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struct xfs_btree_cur *cur,
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union xfs_btree_key *key,
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int dir,
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int numkeys)
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{
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char *dst_key;
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ASSERT(numkeys >= 0);
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ASSERT(dir == 1 || dir == -1);
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dst_key = (char *)key + (dir * cur->bc_ops->key_len);
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||||
memmove(dst_key, key, numkeys * cur->bc_ops->key_len);
|
||||
}
|
||||
|
||||
/*
|
||||
* Shift records one index left/right inside a single btree block.
|
||||
*/
|
||||
STATIC void
|
||||
xfs_btree_shift_recs(
|
||||
struct xfs_btree_cur *cur,
|
||||
union xfs_btree_rec *rec,
|
||||
int dir,
|
||||
int numrecs)
|
||||
{
|
||||
char *dst_rec;
|
||||
|
||||
ASSERT(numrecs >= 0);
|
||||
ASSERT(dir == 1 || dir == -1);
|
||||
|
||||
dst_rec = (char *)rec + (dir * cur->bc_ops->rec_len);
|
||||
memmove(dst_rec, rec, numrecs * cur->bc_ops->rec_len);
|
||||
}
|
||||
|
||||
/*
|
||||
* Shift block pointers one index left/right inside a single btree block.
|
||||
*/
|
||||
STATIC void
|
||||
xfs_btree_shift_ptrs(
|
||||
struct xfs_btree_cur *cur,
|
||||
union xfs_btree_ptr *ptr,
|
||||
int dir,
|
||||
int numptrs)
|
||||
{
|
||||
char *dst_ptr;
|
||||
|
||||
ASSERT(numptrs >= 0);
|
||||
ASSERT(dir == 1 || dir == -1);
|
||||
|
||||
dst_ptr = (char *)ptr + (dir * xfs_btree_ptr_len(cur));
|
||||
memmove(dst_ptr, ptr, numptrs * xfs_btree_ptr_len(cur));
|
||||
}
|
||||
|
||||
/*
|
||||
* Log key values from the btree block.
|
||||
*/
|
||||
@ -1162,6 +1233,79 @@ xfs_btree_log_recs(
|
||||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||||
}
|
||||
|
||||
/*
|
||||
* Log block pointer fields from a btree block (nonleaf).
|
||||
*/
|
||||
STATIC void
|
||||
xfs_btree_log_ptrs(
|
||||
struct xfs_btree_cur *cur, /* btree cursor */
|
||||
struct xfs_buf *bp, /* buffer containing btree block */
|
||||
int first, /* index of first pointer to log */
|
||||
int last) /* index of last pointer to log */
|
||||
{
|
||||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
|
||||
XFS_BTREE_TRACE_ARGBII(cur, bp, first, last);
|
||||
|
||||
if (bp) {
|
||||
struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
|
||||
int level = xfs_btree_get_level(block);
|
||||
|
||||
xfs_trans_log_buf(cur->bc_tp, bp,
|
||||
xfs_btree_ptr_offset(cur, first, level),
|
||||
xfs_btree_ptr_offset(cur, last + 1, level) - 1);
|
||||
} else {
|
||||
xfs_trans_log_inode(cur->bc_tp, cur->bc_private.b.ip,
|
||||
xfs_ilog_fbroot(cur->bc_private.b.whichfork));
|
||||
}
|
||||
|
||||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||||
}
|
||||
|
||||
/*
|
||||
* Log fields from a btree block header.
|
||||
*/
|
||||
STATIC void
|
||||
xfs_btree_log_block(
|
||||
struct xfs_btree_cur *cur, /* btree cursor */
|
||||
struct xfs_buf *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 soffsets[] = { /* table of offsets (short) */
|
||||
offsetof(struct xfs_btree_sblock, bb_magic),
|
||||
offsetof(struct xfs_btree_sblock, bb_level),
|
||||
offsetof(struct xfs_btree_sblock, bb_numrecs),
|
||||
offsetof(struct xfs_btree_sblock, bb_leftsib),
|
||||
offsetof(struct xfs_btree_sblock, bb_rightsib),
|
||||
sizeof(struct xfs_btree_sblock)
|
||||
};
|
||||
static const short loffsets[] = { /* table of offsets (long) */
|
||||
offsetof(struct xfs_btree_lblock, bb_magic),
|
||||
offsetof(struct xfs_btree_lblock, bb_level),
|
||||
offsetof(struct xfs_btree_lblock, bb_numrecs),
|
||||
offsetof(struct xfs_btree_lblock, bb_leftsib),
|
||||
offsetof(struct xfs_btree_lblock, bb_rightsib),
|
||||
sizeof(struct xfs_btree_lblock)
|
||||
};
|
||||
|
||||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
|
||||
XFS_BTREE_TRACE_ARGBI(cur, bp, fields);
|
||||
|
||||
if (bp) {
|
||||
xfs_btree_offsets(fields,
|
||||
(cur->bc_flags & XFS_BTREE_LONG_PTRS) ?
|
||||
loffsets : soffsets,
|
||||
XFS_BB_NUM_BITS, &first, &last);
|
||||
xfs_trans_log_buf(cur->bc_tp, bp, first, last);
|
||||
} else {
|
||||
xfs_trans_log_inode(cur->bc_tp, cur->bc_private.b.ip,
|
||||
xfs_ilog_fbroot(cur->bc_private.b.whichfork));
|
||||
}
|
||||
|
||||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||||
}
|
||||
|
||||
/*
|
||||
* Increment cursor by one record at the level.
|
||||
* For nonzero levels the leaf-ward information is untouched.
|
||||
@ -1368,7 +1512,6 @@ error0:
|
||||
return error;
|
||||
}
|
||||
|
||||
|
||||
STATIC int
|
||||
xfs_btree_lookup_get_block(
|
||||
struct xfs_btree_cur *cur, /* btree cursor */
|
||||
@ -1697,3 +1840,177 @@ error0:
|
||||
return error;
|
||||
}
|
||||
|
||||
/*
|
||||
* Move 1 record right from cur/level if possible.
|
||||
* Update cur to reflect the new path.
|
||||
*/
|
||||
int /* error */
|
||||
xfs_btree_rshift(
|
||||
struct xfs_btree_cur *cur,
|
||||
int level,
|
||||
int *stat) /* success/failure */
|
||||
{
|
||||
union xfs_btree_key key; /* btree key */
|
||||
struct xfs_buf *lbp; /* left buffer pointer */
|
||||
struct xfs_btree_block *left; /* left btree block */
|
||||
struct xfs_buf *rbp; /* right buffer pointer */
|
||||
struct xfs_btree_block *right; /* right btree block */
|
||||
struct xfs_btree_cur *tcur; /* temporary btree cursor */
|
||||
union xfs_btree_ptr rptr; /* right block pointer */
|
||||
union xfs_btree_key *rkp; /* right btree key */
|
||||
int rrecs; /* right record count */
|
||||
int lrecs; /* left record count */
|
||||
int error; /* error return value */
|
||||
int i; /* loop counter */
|
||||
|
||||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
|
||||
XFS_BTREE_TRACE_ARGI(cur, level);
|
||||
|
||||
if ((cur->bc_flags & XFS_BTREE_ROOT_IN_INODE) &&
|
||||
(level == cur->bc_nlevels - 1))
|
||||
goto out0;
|
||||
|
||||
/* Set up variables for this block as "left". */
|
||||
left = xfs_btree_get_block(cur, level, &lbp);
|
||||
|
||||
#ifdef DEBUG
|
||||
error = xfs_btree_check_block(cur, left, level, lbp);
|
||||
if (error)
|
||||
goto error0;
|
||||
#endif
|
||||
|
||||
/* If we've got no right sibling then we can't shift an entry right. */
|
||||
xfs_btree_get_sibling(cur, left, &rptr, XFS_BB_RIGHTSIB);
|
||||
if (xfs_btree_ptr_is_null(cur, &rptr))
|
||||
goto out0;
|
||||
|
||||
/*
|
||||
* If the cursor entry is the one that would be moved, don't
|
||||
* do it... it's too complicated.
|
||||
*/
|
||||
lrecs = xfs_btree_get_numrecs(left);
|
||||
if (cur->bc_ptrs[level] >= lrecs)
|
||||
goto out0;
|
||||
|
||||
/* Set up the right neighbor as "right". */
|
||||
error = xfs_btree_read_buf_block(cur, &rptr, level, 0, &right, &rbp);
|
||||
if (error)
|
||||
goto error0;
|
||||
|
||||
/* If it's full, it can't take another entry. */
|
||||
rrecs = xfs_btree_get_numrecs(right);
|
||||
if (rrecs == cur->bc_ops->get_maxrecs(cur, level))
|
||||
goto out0;
|
||||
|
||||
XFS_BTREE_STATS_INC(cur, rshift);
|
||||
XFS_BTREE_STATS_ADD(cur, moves, rrecs);
|
||||
|
||||
/*
|
||||
* Make a hole at the start of the right neighbor block, then
|
||||
* copy the last left block entry to the hole.
|
||||
*/
|
||||
if (level > 0) {
|
||||
/* It's a nonleaf. make a hole in the keys and ptrs */
|
||||
union xfs_btree_key *lkp;
|
||||
union xfs_btree_ptr *lpp;
|
||||
union xfs_btree_ptr *rpp;
|
||||
|
||||
lkp = xfs_btree_key_addr(cur, lrecs, left);
|
||||
lpp = xfs_btree_ptr_addr(cur, lrecs, left);
|
||||
rkp = xfs_btree_key_addr(cur, 1, right);
|
||||
rpp = xfs_btree_ptr_addr(cur, 1, right);
|
||||
|
||||
#ifdef DEBUG
|
||||
for (i = rrecs - 1; i >= 0; i--) {
|
||||
error = xfs_btree_check_ptr(cur, rpp, i, level);
|
||||
if (error)
|
||||
goto error0;
|
||||
}
|
||||
#endif
|
||||
|
||||
xfs_btree_shift_keys(cur, rkp, 1, rrecs);
|
||||
xfs_btree_shift_ptrs(cur, rpp, 1, rrecs);
|
||||
|
||||
#ifdef DEBUG
|
||||
error = xfs_btree_check_ptr(cur, lpp, 0, level);
|
||||
if (error)
|
||||
goto error0;
|
||||
#endif
|
||||
|
||||
/* Now put the new data in, and log it. */
|
||||
xfs_btree_copy_keys(cur, rkp, lkp, 1);
|
||||
xfs_btree_copy_ptrs(cur, rpp, lpp, 1);
|
||||
|
||||
xfs_btree_log_keys(cur, rbp, 1, rrecs + 1);
|
||||
xfs_btree_log_ptrs(cur, rbp, 1, rrecs + 1);
|
||||
|
||||
xfs_btree_check_key(cur->bc_btnum, rkp,
|
||||
xfs_btree_key_addr(cur, 2, right));
|
||||
} else {
|
||||
/* It's a leaf. make a hole in the records */
|
||||
union xfs_btree_rec *lrp;
|
||||
union xfs_btree_rec *rrp;
|
||||
|
||||
lrp = xfs_btree_rec_addr(cur, lrecs, left);
|
||||
rrp = xfs_btree_rec_addr(cur, 1, right);
|
||||
|
||||
xfs_btree_shift_recs(cur, rrp, 1, rrecs);
|
||||
|
||||
/* Now put the new data in, and log it. */
|
||||
xfs_btree_copy_recs(cur, rrp, lrp, 1);
|
||||
xfs_btree_log_recs(cur, rbp, 1, rrecs + 1);
|
||||
|
||||
cur->bc_ops->init_key_from_rec(&key, rrp);
|
||||
rkp = &key;
|
||||
|
||||
xfs_btree_check_rec(cur->bc_btnum, rrp,
|
||||
xfs_btree_rec_addr(cur, 2, right));
|
||||
}
|
||||
|
||||
/*
|
||||
* Decrement and log left's numrecs, bump and log right's numrecs.
|
||||
*/
|
||||
xfs_btree_set_numrecs(left, --lrecs);
|
||||
xfs_btree_log_block(cur, lbp, XFS_BB_NUMRECS);
|
||||
|
||||
xfs_btree_set_numrecs(right, ++rrecs);
|
||||
xfs_btree_log_block(cur, rbp, XFS_BB_NUMRECS);
|
||||
|
||||
/*
|
||||
* Using a temporary cursor, update the parent key values of the
|
||||
* block on the right.
|
||||
*/
|
||||
error = xfs_btree_dup_cursor(cur, &tcur);
|
||||
if (error)
|
||||
goto error0;
|
||||
i = xfs_btree_lastrec(tcur, level);
|
||||
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
|
||||
|
||||
error = xfs_btree_increment(tcur, level, &i);
|
||||
if (error)
|
||||
goto error1;
|
||||
|
||||
error = xfs_btree_updkey(tcur, rkp, level + 1);
|
||||
if (error)
|
||||
goto error1;
|
||||
|
||||
xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
|
||||
|
||||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||||
*stat = 1;
|
||||
return 0;
|
||||
|
||||
out0:
|
||||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||||
*stat = 0;
|
||||
return 0;
|
||||
|
||||
error0:
|
||||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
|
||||
return error;
|
||||
|
||||
error1:
|
||||
XFS_BTREE_TRACE_CURSOR(tcur, XBT_ERROR);
|
||||
xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR);
|
||||
return error;
|
||||
}
|
||||
|
||||
@ -533,6 +533,7 @@ int xfs_btree_decrement(struct xfs_btree_cur *, int, int *);
|
||||
int xfs_btree_lookup(struct xfs_btree_cur *, xfs_lookup_t, int *);
|
||||
int xfs_btree_updkey(struct xfs_btree_cur *, union xfs_btree_key *, int);
|
||||
int xfs_btree_update(struct xfs_btree_cur *, union xfs_btree_rec *);
|
||||
int xfs_btree_rshift(struct xfs_btree_cur *, int, int *);
|
||||
|
||||
/*
|
||||
* Helpers.
|
||||
@ -542,6 +543,12 @@ static inline int xfs_btree_get_numrecs(struct xfs_btree_block *block)
|
||||
return be16_to_cpu(block->bb_numrecs);
|
||||
}
|
||||
|
||||
static inline void xfs_btree_set_numrecs(struct xfs_btree_block *block,
|
||||
__uint16_t numrecs)
|
||||
{
|
||||
block->bb_numrecs = cpu_to_be16(numrecs);
|
||||
}
|
||||
|
||||
static inline int xfs_btree_get_level(struct xfs_btree_block *block)
|
||||
{
|
||||
return be16_to_cpu(block->bb_level);
|
||||
|
||||
@ -45,7 +45,6 @@ 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);
|
||||
STATIC int xfs_inobt_lshift(xfs_btree_cur_t *, int, int *);
|
||||
STATIC int xfs_inobt_newroot(xfs_btree_cur_t *, int *);
|
||||
STATIC int xfs_inobt_rshift(xfs_btree_cur_t *, int, int *);
|
||||
STATIC int xfs_inobt_split(xfs_btree_cur_t *, int, xfs_agblock_t *,
|
||||
xfs_inobt_key_t *, xfs_btree_cur_t **, int *);
|
||||
|
||||
@ -337,7 +336,7 @@ xfs_inobt_delrec(
|
||||
*/
|
||||
if (be16_to_cpu(left->bb_numrecs) - 1 >=
|
||||
XFS_INOBT_BLOCK_MINRECS(level, cur)) {
|
||||
if ((error = xfs_inobt_rshift(tcur, level, &i)))
|
||||
if ((error = xfs_btree_rshift(tcur, level, &i)))
|
||||
goto error0;
|
||||
if (i) {
|
||||
ASSERT(be16_to_cpu(block->bb_numrecs) >=
|
||||
@ -608,7 +607,7 @@ xfs_inobt_insrec(
|
||||
/*
|
||||
* First, try shifting an entry to the right neighbor.
|
||||
*/
|
||||
if ((error = xfs_inobt_rshift(cur, level, &i)))
|
||||
if ((error = xfs_btree_rshift(cur, level, &i)))
|
||||
return error;
|
||||
if (i) {
|
||||
/* nothing */
|
||||
@ -1116,136 +1115,6 @@ xfs_inobt_newroot(
|
||||
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 (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_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 (be16_to_cpu(right->bb_numrecs) == 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, be16_to_cpu(left->bb_numrecs), cur);
|
||||
lpp = XFS_INOBT_PTR_ADDR(left, be16_to_cpu(left->bb_numrecs), cur);
|
||||
rkp = XFS_INOBT_KEY_ADDR(right, 1, cur);
|
||||
rpp = XFS_INOBT_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_inobt_log_keys(cur, rbp, 1, be16_to_cpu(right->bb_numrecs) + 1);
|
||||
xfs_inobt_log_ptrs(cur, rbp, 1, be16_to_cpu(right->bb_numrecs) + 1);
|
||||
} else {
|
||||
lrp = XFS_INOBT_REC_ADDR(left, be16_to_cpu(left->bb_numrecs), cur);
|
||||
rrp = XFS_INOBT_REC_ADDR(right, 1, cur);
|
||||
memmove(rrp + 1, rrp, be16_to_cpu(right->bb_numrecs) * sizeof(*rrp));
|
||||
*rrp = *lrp;
|
||||
xfs_inobt_log_recs(cur, rbp, 1, be16_to_cpu(right->bb_numrecs) + 1);
|
||||
key.ir_startino = rrp->ir_startino;
|
||||
rkp = &key;
|
||||
}
|
||||
/*
|
||||
* Decrement and log left's numrecs, bump and log right's numrecs.
|
||||
*/
|
||||
be16_add_cpu(&left->bb_numrecs, -1);
|
||||
xfs_inobt_log_block(cur->bc_tp, lbp, XFS_BB_NUMRECS);
|
||||
be16_add_cpu(&right->bb_numrecs, 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_btree_increment(tcur, level, &i)) ||
|
||||
(error = xfs_btree_updkey(tcur, (union xfs_btree_key *)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).
|
||||
|
||||
Loading…
Reference in New Issue
Block a user