From 91cca5df9bc85efdabfa645f51d54259ed09f4bf Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Thu, 30 Oct 2008 16:58:01 +1100 Subject: [XFS] implement generic xfs_btree_delete/delrec Make the btree delete 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:32205a Signed-off-by: Christoph Hellwig Signed-off-by: Lachlan McIlroy Signed-off-by: Bill O'Donnell Signed-off-by: David Chinner --- fs/xfs/xfs_bmap_btree.c | 525 +----------------------------------------------- 1 file changed, 9 insertions(+), 516 deletions(-) (limited to 'fs/xfs/xfs_bmap_btree.c') diff --git a/fs/xfs/xfs_bmap_btree.c b/fs/xfs/xfs_bmap_btree.c index 6b7774ebc26a..5b8030561d78 100644 --- a/fs/xfs/xfs_bmap_btree.c +++ b/fs/xfs/xfs_bmap_btree.c @@ -44,14 +44,6 @@ #include "xfs_error.h" #include "xfs_quota.h" -/* - * Prototypes for internal btree functions. - */ - - -STATIC void xfs_bmbt_log_keys(xfs_btree_cur_t *, xfs_buf_t *, int, int); -STATIC void xfs_bmbt_log_ptrs(xfs_btree_cur_t *, xfs_buf_t *, int, int); - #undef EXIT #define ENTRY XBT_ENTRY @@ -80,453 +72,6 @@ STATIC void xfs_bmbt_log_ptrs(xfs_btree_cur_t *, xfs_buf_t *, int, int); #define XFS_BMBT_TRACE_CURSOR(c,s) \ XFS_BTREE_TRACE_CURSOR(c,s) - -/* - * Internal functions. - */ - -/* - * Delete record pointed to by cur/level. - */ -STATIC int /* error */ -xfs_bmbt_delrec( - xfs_btree_cur_t *cur, - int level, - int *stat) /* success/failure */ -{ - xfs_bmbt_block_t *block; /* bmap btree block */ - xfs_fsblock_t bno; /* fs-relative block number */ - xfs_buf_t *bp; /* buffer for block */ - int error; /* error return value */ - int i; /* loop counter */ - int j; /* temp state */ - xfs_bmbt_key_t key; /* bmap btree key */ - xfs_bmbt_key_t *kp=NULL; /* pointer to bmap btree key */ - xfs_fsblock_t lbno; /* left sibling block number */ - xfs_buf_t *lbp; /* left buffer pointer */ - xfs_bmbt_block_t *left; /* left btree block */ - xfs_bmbt_key_t *lkp; /* left btree key */ - xfs_bmbt_ptr_t *lpp; /* left address pointer */ - int lrecs=0; /* left record count */ - xfs_bmbt_rec_t *lrp; /* left record pointer */ - xfs_mount_t *mp; /* file system mount point */ - xfs_bmbt_ptr_t *pp; /* pointer to bmap block addr */ - int ptr; /* key/record index */ - xfs_fsblock_t rbno; /* right sibling block number */ - xfs_buf_t *rbp; /* right buffer pointer */ - xfs_bmbt_block_t *right; /* right btree block */ - xfs_bmbt_key_t *rkp; /* right btree key */ - xfs_bmbt_rec_t *rp; /* pointer to bmap btree rec */ - xfs_bmbt_ptr_t *rpp; /* right address pointer */ - xfs_bmbt_block_t *rrblock; /* right-right btree block */ - xfs_buf_t *rrbp; /* right-right buffer pointer */ - int rrecs=0; /* right record count */ - xfs_bmbt_rec_t *rrp; /* right record pointer */ - xfs_btree_cur_t *tcur; /* temporary btree cursor */ - int numrecs; /* temporary numrec count */ - int numlrecs, numrrecs; - - XFS_BMBT_TRACE_CURSOR(cur, ENTRY); - XFS_BMBT_TRACE_ARGI(cur, level); - ptr = cur->bc_ptrs[level]; - tcur = NULL; - if (ptr == 0) { - XFS_BMBT_TRACE_CURSOR(cur, EXIT); - *stat = 0; - return 0; - } - block = xfs_bmbt_get_block(cur, level, &bp); - numrecs = be16_to_cpu(block->bb_numrecs); -#ifdef DEBUG - if ((error = xfs_btree_check_lblock(cur, block, level, bp))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } -#endif - if (ptr > numrecs) { - XFS_BMBT_TRACE_CURSOR(cur, EXIT); - *stat = 0; - return 0; - } - XFS_STATS_INC(xs_bmbt_delrec); - if (level > 0) { - kp = XFS_BMAP_KEY_IADDR(block, 1, cur); - pp = XFS_BMAP_PTR_IADDR(block, 1, cur); -#ifdef DEBUG - for (i = ptr; i < numrecs; i++) { - if ((error = xfs_btree_check_lptr_disk(cur, pp[i], level))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } - } -#endif - if (ptr < numrecs) { - memmove(&kp[ptr - 1], &kp[ptr], - (numrecs - ptr) * sizeof(*kp)); - memmove(&pp[ptr - 1], &pp[ptr], - (numrecs - ptr) * sizeof(*pp)); - xfs_bmbt_log_ptrs(cur, bp, ptr, numrecs - 1); - xfs_bmbt_log_keys(cur, bp, ptr, numrecs - 1); - } - } else { - rp = XFS_BMAP_REC_IADDR(block, 1, cur); - if (ptr < numrecs) { - memmove(&rp[ptr - 1], &rp[ptr], - (numrecs - ptr) * sizeof(*rp)); - xfs_bmbt_log_recs(cur, bp, ptr, numrecs - 1); - } - if (ptr == 1) { - key.br_startoff = - cpu_to_be64(xfs_bmbt_disk_get_startoff(rp)); - kp = &key; - } - } - numrecs--; - block->bb_numrecs = cpu_to_be16(numrecs); - xfs_bmbt_log_block(cur, bp, XFS_BB_NUMRECS); - /* - * We're at the root level. - * First, shrink the root block in-memory. - * Try to get rid of the next level down. - * If we can't then there's nothing left to do. - */ - if (level == cur->bc_nlevels - 1) { - xfs_iroot_realloc(cur->bc_private.b.ip, -1, - cur->bc_private.b.whichfork); - if ((error = xfs_btree_kill_iroot(cur))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } - if (level > 0 && (error = xfs_btree_decrement(cur, level, &j))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } - XFS_BMBT_TRACE_CURSOR(cur, EXIT); - *stat = 1; - return 0; - } - if (ptr == 1 && (error = xfs_btree_updkey(cur, (union xfs_btree_key *)kp, level + 1))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } - if (numrecs >= XFS_BMAP_BLOCK_IMINRECS(level, cur)) { - if (level > 0 && (error = xfs_btree_decrement(cur, level, &j))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } - XFS_BMBT_TRACE_CURSOR(cur, EXIT); - *stat = 1; - return 0; - } - rbno = be64_to_cpu(block->bb_rightsib); - lbno = be64_to_cpu(block->bb_leftsib); - /* - * One child of root, need to get a chance to copy its contents - * into the root and delete it. Can't go up to next level, - * there's nothing to delete there. - */ - if (lbno == NULLFSBLOCK && rbno == NULLFSBLOCK && - level == cur->bc_nlevels - 2) { - if ((error = xfs_btree_kill_iroot(cur))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } - if (level > 0 && (error = xfs_btree_decrement(cur, level, &i))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } - XFS_BMBT_TRACE_CURSOR(cur, EXIT); - *stat = 1; - return 0; - } - ASSERT(rbno != NULLFSBLOCK || lbno != NULLFSBLOCK); - if ((error = xfs_btree_dup_cursor(cur, &tcur))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } - bno = NULLFSBLOCK; - if (rbno != NULLFSBLOCK) { - i = xfs_btree_lastrec(tcur, level); - XFS_WANT_CORRUPTED_GOTO(i == 1, error0); - if ((error = xfs_btree_increment(tcur, level, &i))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } - XFS_WANT_CORRUPTED_GOTO(i == 1, error0); - i = xfs_btree_lastrec(tcur, level); - XFS_WANT_CORRUPTED_GOTO(i == 1, error0); - rbp = tcur->bc_bufs[level]; - right = XFS_BUF_TO_BMBT_BLOCK(rbp); -#ifdef DEBUG - if ((error = xfs_btree_check_lblock(cur, right, level, rbp))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } -#endif - bno = be64_to_cpu(right->bb_leftsib); - if (be16_to_cpu(right->bb_numrecs) - 1 >= - XFS_BMAP_BLOCK_IMINRECS(level, cur)) { - if ((error = xfs_btree_lshift(tcur, level, &i))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } - if (i) { - ASSERT(be16_to_cpu(block->bb_numrecs) >= - XFS_BMAP_BLOCK_IMINRECS(level, tcur)); - xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR); - tcur = NULL; - if (level > 0) { - if ((error = xfs_btree_decrement(cur, - level, &i))) { - XFS_BMBT_TRACE_CURSOR(cur, - ERROR); - goto error0; - } - } - XFS_BMBT_TRACE_CURSOR(cur, EXIT); - *stat = 1; - return 0; - } - } - rrecs = be16_to_cpu(right->bb_numrecs); - if (lbno != NULLFSBLOCK) { - i = xfs_btree_firstrec(tcur, level); - XFS_WANT_CORRUPTED_GOTO(i == 1, error0); - if ((error = xfs_btree_decrement(tcur, level, &i))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } - XFS_WANT_CORRUPTED_GOTO(i == 1, error0); - } - } - if (lbno != NULLFSBLOCK) { - i = xfs_btree_firstrec(tcur, level); - XFS_WANT_CORRUPTED_GOTO(i == 1, error0); - /* - * decrement to last in block - */ - if ((error = xfs_btree_decrement(tcur, level, &i))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } - i = xfs_btree_firstrec(tcur, level); - XFS_WANT_CORRUPTED_GOTO(i == 1, error0); - lbp = tcur->bc_bufs[level]; - left = XFS_BUF_TO_BMBT_BLOCK(lbp); -#ifdef DEBUG - if ((error = xfs_btree_check_lblock(cur, left, level, lbp))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } -#endif - bno = be64_to_cpu(left->bb_rightsib); - if (be16_to_cpu(left->bb_numrecs) - 1 >= - XFS_BMAP_BLOCK_IMINRECS(level, cur)) { - if ((error = xfs_btree_rshift(tcur, level, &i))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } - if (i) { - ASSERT(be16_to_cpu(block->bb_numrecs) >= - XFS_BMAP_BLOCK_IMINRECS(level, tcur)); - xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR); - tcur = NULL; - if (level == 0) - cur->bc_ptrs[0]++; - XFS_BMBT_TRACE_CURSOR(cur, EXIT); - *stat = 1; - return 0; - } - } - lrecs = be16_to_cpu(left->bb_numrecs); - } - xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR); - tcur = NULL; - mp = cur->bc_mp; - ASSERT(bno != NULLFSBLOCK); - if (lbno != NULLFSBLOCK && - lrecs + be16_to_cpu(block->bb_numrecs) <= XFS_BMAP_BLOCK_IMAXRECS(level, cur)) { - rbno = bno; - right = block; - rbp = bp; - if ((error = xfs_btree_read_bufl(mp, cur->bc_tp, lbno, 0, &lbp, - XFS_BMAP_BTREE_REF))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } - left = XFS_BUF_TO_BMBT_BLOCK(lbp); - if ((error = xfs_btree_check_lblock(cur, left, level, lbp))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } - } else if (rbno != NULLFSBLOCK && - rrecs + be16_to_cpu(block->bb_numrecs) <= - XFS_BMAP_BLOCK_IMAXRECS(level, cur)) { - lbno = bno; - left = block; - lbp = bp; - if ((error = xfs_btree_read_bufl(mp, cur->bc_tp, rbno, 0, &rbp, - XFS_BMAP_BTREE_REF))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } - right = XFS_BUF_TO_BMBT_BLOCK(rbp); - if ((error = xfs_btree_check_lblock(cur, right, level, rbp))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } - lrecs = be16_to_cpu(left->bb_numrecs); - } else { - if (level > 0 && (error = xfs_btree_decrement(cur, level, &i))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } - XFS_BMBT_TRACE_CURSOR(cur, EXIT); - *stat = 1; - return 0; - } - numlrecs = be16_to_cpu(left->bb_numrecs); - numrrecs = be16_to_cpu(right->bb_numrecs); - if (level > 0) { - lkp = XFS_BMAP_KEY_IADDR(left, numlrecs + 1, cur); - lpp = XFS_BMAP_PTR_IADDR(left, numlrecs + 1, cur); - rkp = XFS_BMAP_KEY_IADDR(right, 1, cur); - rpp = XFS_BMAP_PTR_IADDR(right, 1, cur); -#ifdef DEBUG - for (i = 0; i < numrrecs; i++) { - if ((error = xfs_btree_check_lptr_disk(cur, rpp[i], level))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } - } -#endif - memcpy(lkp, rkp, numrrecs * sizeof(*lkp)); - memcpy(lpp, rpp, numrrecs * sizeof(*lpp)); - xfs_bmbt_log_keys(cur, lbp, numlrecs + 1, numlrecs + numrrecs); - xfs_bmbt_log_ptrs(cur, lbp, numlrecs + 1, numlrecs + numrrecs); - } else { - lrp = XFS_BMAP_REC_IADDR(left, numlrecs + 1, cur); - rrp = XFS_BMAP_REC_IADDR(right, 1, cur); - memcpy(lrp, rrp, numrrecs * sizeof(*lrp)); - xfs_bmbt_log_recs(cur, lbp, numlrecs + 1, numlrecs + numrrecs); - } - be16_add_cpu(&left->bb_numrecs, numrrecs); - left->bb_rightsib = right->bb_rightsib; - xfs_bmbt_log_block(cur, lbp, XFS_BB_RIGHTSIB | XFS_BB_NUMRECS); - if (be64_to_cpu(left->bb_rightsib) != NULLDFSBNO) { - if ((error = xfs_btree_read_bufl(mp, cur->bc_tp, - be64_to_cpu(left->bb_rightsib), - 0, &rrbp, XFS_BMAP_BTREE_REF))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } - rrblock = XFS_BUF_TO_BMBT_BLOCK(rrbp); - if ((error = xfs_btree_check_lblock(cur, rrblock, level, rrbp))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } - rrblock->bb_leftsib = cpu_to_be64(lbno); - xfs_bmbt_log_block(cur, rrbp, XFS_BB_LEFTSIB); - } - xfs_bmap_add_free(XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(rbp)), 1, - cur->bc_private.b.flist, mp); - cur->bc_private.b.ip->i_d.di_nblocks--; - xfs_trans_log_inode(cur->bc_tp, cur->bc_private.b.ip, XFS_ILOG_CORE); - XFS_TRANS_MOD_DQUOT_BYINO(mp, cur->bc_tp, cur->bc_private.b.ip, - XFS_TRANS_DQ_BCOUNT, -1L); - xfs_trans_binval(cur->bc_tp, rbp); - if (bp != lbp) { - cur->bc_bufs[level] = lbp; - cur->bc_ptrs[level] += lrecs; - cur->bc_ra[level] = 0; - } else if ((error = xfs_btree_increment(cur, level + 1, &i))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - goto error0; - } - if (level > 0) - cur->bc_ptrs[level]--; - XFS_BMBT_TRACE_CURSOR(cur, EXIT); - *stat = 2; - return 0; - -error0: - if (tcur) - xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR); - return error; -} - -/* - * Log key values from the btree block. - */ -STATIC void -xfs_bmbt_log_keys( - xfs_btree_cur_t *cur, - xfs_buf_t *bp, - int kfirst, - int klast) -{ - xfs_trans_t *tp; - - XFS_BMBT_TRACE_CURSOR(cur, ENTRY); - XFS_BMBT_TRACE_ARGBII(cur, bp, kfirst, klast); - tp = cur->bc_tp; - if (bp) { - xfs_bmbt_block_t *block; - int first; - xfs_bmbt_key_t *kp; - int last; - - block = XFS_BUF_TO_BMBT_BLOCK(bp); - kp = XFS_BMAP_KEY_DADDR(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(tp, bp, first, last); - } else { - xfs_inode_t *ip; - - ip = cur->bc_private.b.ip; - xfs_trans_log_inode(tp, ip, - XFS_ILOG_FBROOT(cur->bc_private.b.whichfork)); - } - XFS_BMBT_TRACE_CURSOR(cur, EXIT); -} - -/* - * Log pointer values from the btree block. - */ -STATIC void -xfs_bmbt_log_ptrs( - xfs_btree_cur_t *cur, - xfs_buf_t *bp, - int pfirst, - int plast) -{ - xfs_trans_t *tp; - - XFS_BMBT_TRACE_CURSOR(cur, ENTRY); - XFS_BMBT_TRACE_ARGBII(cur, bp, pfirst, plast); - tp = cur->bc_tp; - if (bp) { - xfs_bmbt_block_t *block; - int first; - int last; - xfs_bmbt_ptr_t *pp; - - block = XFS_BUF_TO_BMBT_BLOCK(bp); - pp = XFS_BMAP_PTR_DADDR(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(tp, bp, first, last); - } else { - xfs_inode_t *ip; - - ip = cur->bc_private.b.ip; - xfs_trans_log_inode(tp, ip, - XFS_ILOG_FBROOT(cur->bc_private.b.whichfork)); - } - XFS_BMBT_TRACE_CURSOR(cur, EXIT); -} - /* * Determine the extent state. */ @@ -575,42 +120,6 @@ xfs_bmdr_to_bmbt( memcpy(tpp, fpp, sizeof(*fpp) * dmxr); } -/* - * Delete the record pointed to by cur. - */ -int /* error */ -xfs_bmbt_delete( - xfs_btree_cur_t *cur, - int *stat) /* success/failure */ -{ - int error; /* error return value */ - int i; - int level; - - XFS_BMBT_TRACE_CURSOR(cur, ENTRY); - for (level = 0, i = 2; i == 2; level++) { - if ((error = xfs_bmbt_delrec(cur, level, &i))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - 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))) { - XFS_BMBT_TRACE_CURSOR(cur, ERROR); - return error; - } - break; - } - } - } - XFS_BMBT_TRACE_CURSOR(cur, EXIT); - *stat = i; - return 0; -} - /* * Convert a compressed bmap extent record to an uncompressed form. * This code must be in sync with the routines xfs_bmbt_get_startoff, @@ -664,31 +173,6 @@ xfs_bmbt_get_all( __xfs_bmbt_get_all(r->l0, r->l1, s); } -/* - * Get the block pointer for the given level of the cursor. - * Fill in the buffer pointer, if applicable. - */ -xfs_bmbt_block_t * -xfs_bmbt_get_block( - xfs_btree_cur_t *cur, - int level, - xfs_buf_t **bpp) -{ - xfs_ifork_t *ifp; - xfs_bmbt_block_t *rval; - - if (level < cur->bc_nlevels - 1) { - *bpp = cur->bc_bufs[level]; - rval = XFS_BUF_TO_BMBT_BLOCK(*bpp); - } else { - *bpp = NULL; - ifp = XFS_IFORK_PTR(cur->bc_private.b.ip, - cur->bc_private.b.whichfork); - rval = ifp->if_broot; - } - return rval; -} - /* * Extract the blockcount field from an in memory bmap extent record. */ @@ -1225,6 +709,14 @@ xfs_bmbt_free_block( return 0; } +STATIC int +xfs_bmbt_get_minrecs( + struct xfs_btree_cur *cur, + int level) +{ + return XFS_BMAP_BLOCK_IMINRECS(level, cur); +} + STATIC int xfs_bmbt_get_maxrecs( struct xfs_btree_cur *cur, @@ -1389,6 +881,7 @@ static const struct xfs_btree_ops xfs_bmbt_ops = { .alloc_block = xfs_bmbt_alloc_block, .free_block = xfs_bmbt_free_block, .get_maxrecs = xfs_bmbt_get_maxrecs, + .get_minrecs = xfs_bmbt_get_minrecs, .get_dmaxrecs = xfs_bmbt_get_dmaxrecs, .init_key_from_rec = xfs_bmbt_init_key_from_rec, .init_rec_from_key = xfs_bmbt_init_rec_from_key, -- cgit v1.2.3