[XFS] implement generic xfs_btree_lshift
Make the btree left 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:32197a
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>
diff --git a/fs/xfs/xfs_bmap_btree.c b/fs/xfs/xfs_bmap_btree.c
index 9d18fa8..809bd6e 100644
--- a/fs/xfs/xfs_bmap_btree.c
+++ b/fs/xfs/xfs_bmap_btree.c
@@ -52,7 +52,6 @@
STATIC int xfs_bmbt_killroot(xfs_btree_cur_t *);
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);
-STATIC int xfs_bmbt_lshift(xfs_btree_cur_t *, int, int *);
STATIC int xfs_bmbt_split(xfs_btree_cur_t *, int, xfs_fsblock_t *,
__uint64_t *, xfs_btree_cur_t **, int *);
@@ -270,7 +269,7 @@
bno = be64_to_cpu(right->bb_leftsib);
if (be16_to_cpu(right->bb_numrecs) - 1 >=
XFS_BMAP_BLOCK_IMINRECS(level, cur)) {
- if ((error = xfs_bmbt_lshift(tcur, level, &i))) {
+ if ((error = xfs_btree_lshift(tcur, level, &i))) {
XFS_BMBT_TRACE_CURSOR(cur, ERROR);
goto error0;
}
@@ -544,7 +543,7 @@
if (i) {
/* nothing */
} else {
- if ((error = xfs_bmbt_lshift(cur, level, &i))) {
+ if ((error = xfs_btree_lshift(cur, level, &i))) {
XFS_BMBT_TRACE_CURSOR(cur, ERROR);
return error;
}
@@ -811,139 +810,6 @@
}
/*
- * Move 1 record left from cur/level if possible.
- * Update cur to reflect the new path.
- */
-STATIC int /* error */
-xfs_bmbt_lshift(
- xfs_btree_cur_t *cur,
- int level,
- int *stat) /* success/failure */
-{
- int error; /* error return value */
-#ifdef DEBUG
- int i; /* loop counter */
-#endif
- xfs_bmbt_key_t key; /* bmap btree key */
- xfs_buf_t *lbp; /* left buffer pointer */
- xfs_bmbt_block_t *left; /* left btree block */
- xfs_bmbt_key_t *lkp=NULL; /* left btree key */
- xfs_bmbt_ptr_t *lpp; /* left address pointer */
- int lrecs; /* left record count */
- xfs_bmbt_rec_t *lrp=NULL; /* left record pointer */
- xfs_mount_t *mp; /* file system mount point */
- xfs_buf_t *rbp; /* right buffer pointer */
- xfs_bmbt_block_t *right; /* right btree block */
- xfs_bmbt_key_t *rkp=NULL; /* right btree key */
- xfs_bmbt_ptr_t *rpp=NULL; /* right address pointer */
- xfs_bmbt_rec_t *rrp=NULL; /* right record pointer */
- int rrecs; /* right record count */
-
- XFS_BMBT_TRACE_CURSOR(cur, ENTRY);
- XFS_BMBT_TRACE_ARGI(cur, level);
- if (level == cur->bc_nlevels - 1) {
- XFS_BMBT_TRACE_CURSOR(cur, EXIT);
- *stat = 0;
- return 0;
- }
- rbp = cur->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);
- return error;
- }
-#endif
- if (be64_to_cpu(right->bb_leftsib) == NULLDFSBNO) {
- XFS_BMBT_TRACE_CURSOR(cur, EXIT);
- *stat = 0;
- return 0;
- }
- if (cur->bc_ptrs[level] <= 1) {
- XFS_BMBT_TRACE_CURSOR(cur, EXIT);
- *stat = 0;
- return 0;
- }
- mp = cur->bc_mp;
- if ((error = xfs_btree_read_bufl(mp, cur->bc_tp, be64_to_cpu(right->bb_leftsib), 0,
- &lbp, XFS_BMAP_BTREE_REF))) {
- XFS_BMBT_TRACE_CURSOR(cur, ERROR);
- return error;
- }
- left = XFS_BUF_TO_BMBT_BLOCK(lbp);
- if ((error = xfs_btree_check_lblock(cur, left, level, lbp))) {
- XFS_BMBT_TRACE_CURSOR(cur, ERROR);
- return error;
- }
- if (be16_to_cpu(left->bb_numrecs) == XFS_BMAP_BLOCK_IMAXRECS(level, cur)) {
- XFS_BMBT_TRACE_CURSOR(cur, EXIT);
- *stat = 0;
- return 0;
- }
- lrecs = be16_to_cpu(left->bb_numrecs) + 1;
- if (level > 0) {
- lkp = XFS_BMAP_KEY_IADDR(left, lrecs, cur);
- rkp = XFS_BMAP_KEY_IADDR(right, 1, cur);
- *lkp = *rkp;
- xfs_bmbt_log_keys(cur, lbp, lrecs, lrecs);
- lpp = XFS_BMAP_PTR_IADDR(left, lrecs, cur);
- rpp = XFS_BMAP_PTR_IADDR(right, 1, cur);
-#ifdef DEBUG
- if ((error = xfs_btree_check_lptr_disk(cur, *rpp, level))) {
- XFS_BMBT_TRACE_CURSOR(cur, ERROR);
- return error;
- }
-#endif
- *lpp = *rpp;
- xfs_bmbt_log_ptrs(cur, lbp, lrecs, lrecs);
- } else {
- lrp = XFS_BMAP_REC_IADDR(left, lrecs, cur);
- rrp = XFS_BMAP_REC_IADDR(right, 1, cur);
- *lrp = *rrp;
- xfs_bmbt_log_recs(cur, lbp, lrecs, lrecs);
- }
- left->bb_numrecs = cpu_to_be16(lrecs);
- xfs_bmbt_log_block(cur, lbp, XFS_BB_NUMRECS);
-#ifdef DEBUG
- if (level > 0)
- xfs_btree_check_key(XFS_BTNUM_BMAP, lkp - 1, lkp);
- else
- xfs_btree_check_rec(XFS_BTNUM_BMAP, lrp - 1, lrp);
-#endif
- rrecs = be16_to_cpu(right->bb_numrecs) - 1;
- right->bb_numrecs = cpu_to_be16(rrecs);
- xfs_bmbt_log_block(cur, rbp, XFS_BB_NUMRECS);
- if (level > 0) {
-#ifdef DEBUG
- for (i = 0; i < rrecs; i++) {
- if ((error = xfs_btree_check_lptr_disk(cur, rpp[i + 1],
- level))) {
- XFS_BMBT_TRACE_CURSOR(cur, ERROR);
- return error;
- }
- }
-#endif
- memmove(rkp, rkp + 1, rrecs * sizeof(*rkp));
- memmove(rpp, rpp + 1, rrecs * sizeof(*rpp));
- xfs_bmbt_log_keys(cur, rbp, 1, rrecs);
- xfs_bmbt_log_ptrs(cur, rbp, 1, rrecs);
- } else {
- memmove(rrp, rrp + 1, rrecs * sizeof(*rrp));
- xfs_bmbt_log_recs(cur, rbp, 1, rrecs);
- key.br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(rrp));
- rkp = &key;
- }
- if ((error = xfs_btree_updkey(cur, (union xfs_btree_key *)rkp, level + 1))) {
- XFS_BMBT_TRACE_CURSOR(cur, ERROR);
- return error;
- }
- cur->bc_ptrs[level]--;
- XFS_BMBT_TRACE_CURSOR(cur, EXIT);
- *stat = 1;
- return 0;
-}
-
-/*
* Determine the extent state.
*/
/* ARGSUSED */