#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_btree.h"
+#include "xfs_btree_trace.h"
#include "xfs_ialloc.h"
#include "xfs_alloc.h"
#include "xfs_error.h"
STATIC void xfs_alloc_log_keys(xfs_btree_cur_t *, xfs_buf_t *, int, int);
STATIC void xfs_alloc_log_ptrs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
STATIC void xfs_alloc_log_recs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
-STATIC int xfs_alloc_lshift(xfs_btree_cur_t *, int, int *);
STATIC int xfs_alloc_newroot(xfs_btree_cur_t *, int *);
-STATIC int xfs_alloc_rshift(xfs_btree_cur_t *, int, int *);
-STATIC int xfs_alloc_split(xfs_btree_cur_t *, int, xfs_agblock_t *,
- xfs_alloc_key_t *, xfs_btree_cur_t **, int *);
-STATIC int xfs_alloc_updkey(xfs_btree_cur_t *, xfs_alloc_key_t *, int);
/*
* Internal functions.
xfs_alloc_key_t *rkp; /* right block key pointer */
xfs_alloc_ptr_t *rpp; /* right block address pointer */
int rrecs=0; /* number of records in right block */
+ int numrecs;
xfs_alloc_rec_t *rrp; /* right block record pointer */
xfs_btree_cur_t *tcur; /* temporary btree cursor */
/*
* Fail if we're off the end of the block.
*/
- if (ptr > be16_to_cpu(block->bb_numrecs)) {
+ numrecs = be16_to_cpu(block->bb_numrecs);
+ if (ptr > numrecs) {
*stat = 0;
return 0;
}
lkp = XFS_ALLOC_KEY_ADDR(block, 1, cur);
lpp = XFS_ALLOC_PTR_ADDR(block, 1, cur);
#ifdef DEBUG
- for (i = ptr; i < be16_to_cpu(block->bb_numrecs); i++) {
+ for (i = ptr; i < numrecs; i++) {
if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(lpp[i]), level)))
return error;
}
#endif
- if (ptr < be16_to_cpu(block->bb_numrecs)) {
+ if (ptr < numrecs) {
memmove(&lkp[ptr - 1], &lkp[ptr],
- (be16_to_cpu(block->bb_numrecs) - ptr) * sizeof(*lkp));
+ (numrecs - ptr) * sizeof(*lkp));
memmove(&lpp[ptr - 1], &lpp[ptr],
- (be16_to_cpu(block->bb_numrecs) - ptr) * sizeof(*lpp));
- xfs_alloc_log_ptrs(cur, bp, ptr, be16_to_cpu(block->bb_numrecs) - 1);
- xfs_alloc_log_keys(cur, bp, ptr, be16_to_cpu(block->bb_numrecs) - 1);
+ (numrecs - ptr) * sizeof(*lpp));
+ xfs_alloc_log_ptrs(cur, bp, ptr, numrecs - 1);
+ xfs_alloc_log_keys(cur, bp, ptr, numrecs - 1);
}
}
/*
*/
else {
lrp = XFS_ALLOC_REC_ADDR(block, 1, cur);
- if (ptr < be16_to_cpu(block->bb_numrecs)) {
+ if (ptr < numrecs) {
memmove(&lrp[ptr - 1], &lrp[ptr],
- (be16_to_cpu(block->bb_numrecs) - ptr) * sizeof(*lrp));
- xfs_alloc_log_recs(cur, bp, ptr, be16_to_cpu(block->bb_numrecs) - 1);
+ (numrecs - ptr) * sizeof(*lrp));
+ xfs_alloc_log_recs(cur, bp, ptr, numrecs - 1);
}
/*
* If it's the first record in the block, we'll need a key
/*
* Decrement and log the number of entries in the block.
*/
- be16_add(&block->bb_numrecs, -1);
+ numrecs--;
+ block->bb_numrecs = cpu_to_be16(numrecs);
xfs_alloc_log_block(cur->bc_tp, bp, XFS_BB_NUMRECS);
/*
* See if the longest free extent in the allocation group was
if (level == 0 &&
cur->bc_btnum == XFS_BTNUM_CNT &&
be32_to_cpu(block->bb_rightsib) == NULLAGBLOCK &&
- ptr > be16_to_cpu(block->bb_numrecs)) {
- ASSERT(ptr == be16_to_cpu(block->bb_numrecs) + 1);
+ ptr > numrecs) {
+ ASSERT(ptr == numrecs + 1);
/*
* There are still records in the block. Grab the size
* from the last one.
*/
- if (be16_to_cpu(block->bb_numrecs)) {
- rrp = XFS_ALLOC_REC_ADDR(block, be16_to_cpu(block->bb_numrecs), cur);
+ if (numrecs) {
+ rrp = XFS_ALLOC_REC_ADDR(block, numrecs, cur);
agf->agf_longest = rrp->ar_blockcount;
}
/*
* and it's NOT the leaf level,
* then we can get rid of this level.
*/
- if (be16_to_cpu(block->bb_numrecs) == 1 && level > 0) {
+ if (numrecs == 1 && level > 0) {
/*
* lpp is still set to the first pointer in the block.
* Make it the new root of the btree.
*/
bno = be32_to_cpu(agf->agf_roots[cur->bc_btnum]);
agf->agf_roots[cur->bc_btnum] = *lpp;
- be32_add(&agf->agf_levels[cur->bc_btnum], -1);
+ be32_add_cpu(&agf->agf_levels[cur->bc_btnum], -1);
mp->m_perag[be32_to_cpu(agf->agf_seqno)].pagf_levels[cur->bc_btnum]--;
/*
* Put this buffer/block on the ag's freelist.
*/
- if ((error = xfs_alloc_put_freelist(cur->bc_tp,
- cur->bc_private.a.agbp, NULL, bno)))
+ error = xfs_alloc_put_freelist(cur->bc_tp,
+ cur->bc_private.a.agbp, NULL, bno, 1);
+ if (error)
return error;
/*
* Since blocks move to the free list without the
xfs_btree_setbuf(cur, level, NULL);
cur->bc_nlevels--;
} else if (level > 0 &&
- (error = xfs_alloc_decrement(cur, level, &i)))
+ (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_alloc_updkey(cur, lkp, level + 1)))
+ if (ptr == 1 && (error = xfs_btree_updkey(cur, (union xfs_btree_key *)lkp, level + 1)))
return error;
/*
* If the number of records remaining in the block is at least
* the minimum, we're done.
*/
- if (be16_to_cpu(block->bb_numrecs) >= XFS_ALLOC_BLOCK_MINRECS(level, cur)) {
- if (level > 0 && (error = xfs_alloc_decrement(cur, level, &i)))
+ if (numrecs >= XFS_ALLOC_BLOCK_MINRECS(level, cur)) {
+ if (level > 0 && (error = xfs_btree_decrement(cur, level, &i)))
return error;
*stat = 1;
return 0;
*/
i = xfs_btree_lastrec(tcur, level);
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
- if ((error = xfs_alloc_increment(tcur, level, &i)))
+ if ((error = xfs_btree_increment(tcur, level, &i)))
goto error0;
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
i = xfs_btree_lastrec(tcur, level);
*/
if (be16_to_cpu(right->bb_numrecs) - 1 >=
XFS_ALLOC_BLOCK_MINRECS(level, cur)) {
- if ((error = xfs_alloc_lshift(tcur, level, &i)))
+ if ((error = xfs_btree_lshift(tcur, level, &i)))
goto error0;
if (i) {
ASSERT(be16_to_cpu(block->bb_numrecs) >=
xfs_btree_del_cursor(tcur,
XFS_BTREE_NOERROR);
if (level > 0 &&
- (error = xfs_alloc_decrement(cur, level,
+ (error = xfs_btree_decrement(cur, level,
&i)))
return error;
*stat = 1;
if (lbno != NULLAGBLOCK) {
i = xfs_btree_firstrec(tcur, level);
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
- if ((error = xfs_alloc_decrement(tcur, level, &i)))
+ if ((error = xfs_btree_decrement(tcur, level, &i)))
goto error0;
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
}
*/
i = xfs_btree_firstrec(tcur, level);
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
- if ((error = xfs_alloc_decrement(tcur, level, &i)))
+ if ((error = xfs_btree_decrement(tcur, level, &i)))
goto error0;
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
xfs_btree_firstrec(tcur, level);
*/
if (be16_to_cpu(left->bb_numrecs) - 1 >=
XFS_ALLOC_BLOCK_MINRECS(level, cur)) {
- if ((error = xfs_alloc_rshift(tcur, level, &i)))
+ if ((error = xfs_btree_rshift(tcur, level, &i)))
goto error0;
if (i) {
ASSERT(be16_to_cpu(block->bb_numrecs) >=
* See if we can join with the left neighbor block.
*/
if (lbno != NULLAGBLOCK &&
- lrecs + be16_to_cpu(block->bb_numrecs) <= XFS_ALLOC_BLOCK_MAXRECS(level, cur)) {
+ lrecs + numrecs <= XFS_ALLOC_BLOCK_MAXRECS(level, cur)) {
/*
* Set "right" to be the starting block,
* "left" to be the left neighbor.
*/
rbno = bno;
right = block;
+ rrecs = be16_to_cpu(right->bb_numrecs);
rbp = bp;
if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
cur->bc_private.a.agno, lbno, 0, &lbp,
XFS_ALLOC_BTREE_REF)))
return error;
left = XFS_BUF_TO_ALLOC_BLOCK(lbp);
+ lrecs = be16_to_cpu(left->bb_numrecs);
if ((error = xfs_btree_check_sblock(cur, left, level, lbp)))
return error;
}
* If that won't work, see if we can join with the right neighbor block.
*/
else if (rbno != NULLAGBLOCK &&
- rrecs + be16_to_cpu(block->bb_numrecs) <=
- XFS_ALLOC_BLOCK_MAXRECS(level, cur)) {
+ rrecs + numrecs <= XFS_ALLOC_BLOCK_MAXRECS(level, cur)) {
/*
* Set "left" to be the starting block,
* "right" to be the right neighbor.
*/
lbno = bno;
left = block;
+ lrecs = be16_to_cpu(left->bb_numrecs);
lbp = bp;
if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
cur->bc_private.a.agno, rbno, 0, &rbp,
XFS_ALLOC_BTREE_REF)))
return error;
right = XFS_BUF_TO_ALLOC_BLOCK(rbp);
+ rrecs = be16_to_cpu(right->bb_numrecs);
if ((error = xfs_btree_check_sblock(cur, right, level, rbp)))
return error;
}
* Just return. This is probably a logic error, but it's not fatal.
*/
else {
- if (level > 0 && (error = xfs_alloc_decrement(cur, level, &i)))
+ if (level > 0 && (error = xfs_btree_decrement(cur, level, &i)))
return error;
*stat = 1;
return 0;
/*
* It's a non-leaf. Move keys and pointers.
*/
- lkp = XFS_ALLOC_KEY_ADDR(left, be16_to_cpu(left->bb_numrecs) + 1, cur);
- lpp = XFS_ALLOC_PTR_ADDR(left, be16_to_cpu(left->bb_numrecs) + 1, cur);
+ lkp = XFS_ALLOC_KEY_ADDR(left, lrecs + 1, cur);
+ lpp = XFS_ALLOC_PTR_ADDR(left, lrecs + 1, cur);
rkp = XFS_ALLOC_KEY_ADDR(right, 1, cur);
rpp = XFS_ALLOC_PTR_ADDR(right, 1, cur);
#ifdef DEBUG
- for (i = 0; i < be16_to_cpu(right->bb_numrecs); i++) {
+ 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, be16_to_cpu(right->bb_numrecs) * sizeof(*lkp));
- memcpy(lpp, rpp, be16_to_cpu(right->bb_numrecs) * sizeof(*lpp));
- xfs_alloc_log_keys(cur, lbp, be16_to_cpu(left->bb_numrecs) + 1,
- be16_to_cpu(left->bb_numrecs) +
- be16_to_cpu(right->bb_numrecs));
- xfs_alloc_log_ptrs(cur, lbp, be16_to_cpu(left->bb_numrecs) + 1,
- be16_to_cpu(left->bb_numrecs) +
- be16_to_cpu(right->bb_numrecs));
+ memcpy(lkp, rkp, rrecs * sizeof(*lkp));
+ memcpy(lpp, rpp, rrecs * sizeof(*lpp));
+ xfs_alloc_log_keys(cur, lbp, lrecs + 1, lrecs + rrecs);
+ xfs_alloc_log_ptrs(cur, lbp, lrecs + 1, lrecs + rrecs);
} else {
/*
* It's a leaf. Move records.
*/
- lrp = XFS_ALLOC_REC_ADDR(left, be16_to_cpu(left->bb_numrecs) + 1, cur);
+ lrp = XFS_ALLOC_REC_ADDR(left, lrecs + 1, cur);
rrp = XFS_ALLOC_REC_ADDR(right, 1, cur);
- memcpy(lrp, rrp, be16_to_cpu(right->bb_numrecs) * sizeof(*lrp));
- xfs_alloc_log_recs(cur, lbp, be16_to_cpu(left->bb_numrecs) + 1,
- be16_to_cpu(left->bb_numrecs) +
- be16_to_cpu(right->bb_numrecs));
+ memcpy(lrp, rrp, rrecs * sizeof(*lrp));
+ xfs_alloc_log_recs(cur, lbp, lrecs + 1, lrecs + rrecs);
}
/*
* If we joined with the left neighbor, set the buffer in the
*/
if (bp != lbp) {
xfs_btree_setbuf(cur, level, lbp);
- cur->bc_ptrs[level] += be16_to_cpu(left->bb_numrecs);
+ 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_alloc_increment(cur, level + 1, &i)))
+ (error = xfs_btree_increment(cur, level + 1, &i)))
return error;
/*
* Fix up the number of records in the surviving block.
*/
- be16_add(&left->bb_numrecs, be16_to_cpu(right->bb_numrecs));
+ lrecs += rrecs;
+ left->bb_numrecs = cpu_to_be16(lrecs);
/*
* Fix up the right block pointer in the surviving block, and log it.
*/
/*
* Free the deleting block by putting it on the freelist.
*/
- if ((error = xfs_alloc_put_freelist(cur->bc_tp, cur->bc_private.a.agbp,
- NULL, rbno)))
+ error = xfs_alloc_put_freelist(cur->bc_tp,
+ cur->bc_private.a.agbp, NULL, rbno, 1);
+ if (error)
return error;
/*
* Since blocks move to the free list without the coordination
xfs_btree_cur_t *ncur; /* new cursor to be used at next lvl */
xfs_alloc_key_t nkey; /* new key value, from split */
xfs_alloc_rec_t nrec; /* new record value, for caller */
+ int numrecs;
int optr; /* old ptr value */
xfs_alloc_ptr_t *pp; /* pointer to btree addresses */
int ptr; /* index in btree block for this rec */
*/
bp = cur->bc_bufs[level];
block = XFS_BUF_TO_ALLOC_BLOCK(bp);
+ numrecs = be16_to_cpu(block->bb_numrecs);
#ifdef DEBUG
if ((error = xfs_btree_check_sblock(cur, block, level, bp)))
return error;
/*
* Check that the new entry is being inserted in the right place.
*/
- if (ptr <= be16_to_cpu(block->bb_numrecs)) {
+ if (ptr <= numrecs) {
if (level == 0) {
rp = XFS_ALLOC_REC_ADDR(block, ptr, cur);
xfs_btree_check_rec(cur->bc_btnum, recp, rp);
}
#endif
nbno = NULLAGBLOCK;
- ncur = (xfs_btree_cur_t *)0;
+ ncur = NULL;
/*
* If the block is full, we can't insert the new entry until we
* make the block un-full.
*/
- if (be16_to_cpu(block->bb_numrecs) == XFS_ALLOC_BLOCK_MAXRECS(level, cur)) {
+ if (numrecs == XFS_ALLOC_BLOCK_MAXRECS(level, cur)) {
/*
* First, try shifting an entry to the right neighbor.
*/
- if ((error = xfs_alloc_rshift(cur, level, &i)))
+ 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_alloc_lshift(cur, level, &i)))
+ 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_alloc_split(cur, level, &nbno,
- &nkey, &ncur, &i)))
+ 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_ALLOC_BLOCK(bp);
* 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
kp = XFS_ALLOC_KEY_ADDR(block, 1, cur);
pp = XFS_ALLOC_PTR_ADDR(block, 1, cur);
#ifdef DEBUG
- for (i = be16_to_cpu(block->bb_numrecs); i >= ptr; i--) {
+ 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],
- (be16_to_cpu(block->bb_numrecs) - ptr + 1) * sizeof(*kp));
+ (numrecs - ptr + 1) * sizeof(*kp));
memmove(&pp[ptr], &pp[ptr - 1],
- (be16_to_cpu(block->bb_numrecs) - ptr + 1) * sizeof(*pp));
+ (numrecs - ptr + 1) * sizeof(*pp));
#ifdef DEBUG
if ((error = xfs_btree_check_sptr(cur, *bnop, level)))
return error;
*/
kp[ptr - 1] = key;
pp[ptr - 1] = cpu_to_be32(*bnop);
- be16_add(&block->bb_numrecs, 1);
- xfs_alloc_log_keys(cur, bp, ptr, be16_to_cpu(block->bb_numrecs));
- xfs_alloc_log_ptrs(cur, bp, ptr, be16_to_cpu(block->bb_numrecs));
+ numrecs++;
+ block->bb_numrecs = cpu_to_be16(numrecs);
+ xfs_alloc_log_keys(cur, bp, ptr, numrecs);
+ xfs_alloc_log_ptrs(cur, bp, ptr, numrecs);
#ifdef DEBUG
- if (ptr < be16_to_cpu(block->bb_numrecs))
+ if (ptr < numrecs)
xfs_btree_check_key(cur->bc_btnum, kp + ptr - 1,
kp + ptr);
#endif
*/
rp = XFS_ALLOC_REC_ADDR(block, 1, cur);
memmove(&rp[ptr], &rp[ptr - 1],
- (be16_to_cpu(block->bb_numrecs) - ptr + 1) * sizeof(*rp));
+ (numrecs - ptr + 1) * sizeof(*rp));
/*
* Now stuff the new record in, bump numrecs
* and log the new data.
*/
rp[ptr - 1] = *recp;
- be16_add(&block->bb_numrecs, 1);
- xfs_alloc_log_recs(cur, bp, ptr, be16_to_cpu(block->bb_numrecs));
+ numrecs++;
+ block->bb_numrecs = cpu_to_be16(numrecs);
+ xfs_alloc_log_recs(cur, bp, ptr, numrecs);
#ifdef DEBUG
- if (ptr < be16_to_cpu(block->bb_numrecs))
+ if (ptr < numrecs)
xfs_btree_check_rec(cur->bc_btnum, rp + ptr - 1,
rp + ptr);
#endif
/*
* If we inserted at the start of a block, update the parents' keys.
*/
- if (optr == 1 && (error = xfs_alloc_updkey(cur, &key, level + 1)))
+ if (optr == 1 && (error = xfs_btree_updkey(cur, (union xfs_btree_key *)&key, level + 1)))
return error;
/*
* Look to see if the longest extent in the allocation group
}
/*
- * Lookup the record. The cursor is made to point to it, based on dir.
- * Return 0 if can't find any such record, 1 for success.
- */
-STATIC int /* error */
-xfs_alloc_lookup(
- xfs_btree_cur_t *cur, /* btree cursor */
- xfs_lookup_t dir, /* <=, ==, or >= */
- int *stat) /* success/failure */
-{
- xfs_agblock_t agbno; /* a.g. relative btree block number */
- xfs_agnumber_t agno; /* allocation group number */
- xfs_alloc_block_t *block=NULL; /* current btree block */
- int diff; /* difference for the current key */
- int error; /* error return value */
- int keyno=0; /* current key number */
- int level; /* level in the btree */
- xfs_mount_t *mp; /* file system mount point */
-
- XFS_STATS_INC(xs_abt_lookup);
- /*
- * Get the allocation group header, and the root block number.
- */
- mp = cur->bc_mp;
-
- {
- xfs_agf_t *agf; /* a.g. freespace header */
-
- agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
- agno = be32_to_cpu(agf->agf_seqno);
- agbno = be32_to_cpu(agf->agf_roots[cur->bc_btnum]);
- }
- /*
- * Iterate over each level in the btree, starting at the root.
- * For each level above the leaves, find the key we need, based
- * on the lookup record, then follow the corresponding block
- * pointer down to the next level.
- */
- for (level = cur->bc_nlevels - 1, diff = 1; level >= 0; level--) {
- xfs_buf_t *bp; /* buffer pointer for btree block */
- xfs_daddr_t d; /* disk address of btree block */
-
- /*
- * Get the disk address we're looking for.
- */
- d = XFS_AGB_TO_DADDR(mp, agno, agbno);
- /*
- * If the old buffer at this level is for a different block,
- * throw it away, otherwise just use it.
- */
- bp = cur->bc_bufs[level];
- if (bp && XFS_BUF_ADDR(bp) != d)
- bp = (xfs_buf_t *)0;
- if (!bp) {
- /*
- * Need to get a new buffer. Read it, then
- * set it in the cursor, releasing the old one.
- */
- if ((error = xfs_btree_read_bufs(mp, cur->bc_tp, agno,
- agbno, 0, &bp, XFS_ALLOC_BTREE_REF)))
- return error;
- xfs_btree_setbuf(cur, level, bp);
- /*
- * Point to the btree block, now that we have the buffer
- */
- block = XFS_BUF_TO_ALLOC_BLOCK(bp);
- if ((error = xfs_btree_check_sblock(cur, block, level,
- bp)))
- return error;
- } else
- block = XFS_BUF_TO_ALLOC_BLOCK(bp);
- /*
- * If we already had a key match at a higher level, we know
- * we need to use the first entry in this block.
- */
- if (diff == 0)
- keyno = 1;
- /*
- * Otherwise we need to search this block. Do a binary search.
- */
- else {
- int high; /* high entry number */
- xfs_alloc_key_t *kkbase=NULL;/* base of keys in block */
- xfs_alloc_rec_t *krbase=NULL;/* base of records in block */
- int low; /* low entry number */
-
- /*
- * Get a pointer to keys or records.
- */
- if (level > 0)
- kkbase = XFS_ALLOC_KEY_ADDR(block, 1, cur);
- else
- krbase = XFS_ALLOC_REC_ADDR(block, 1, cur);
- /*
- * Set low and high entry numbers, 1-based.
- */
- low = 1;
- if (!(high = be16_to_cpu(block->bb_numrecs))) {
- /*
- * If the block is empty, the tree must
- * be an empty leaf.
- */
- ASSERT(level == 0 && cur->bc_nlevels == 1);
- cur->bc_ptrs[0] = dir != XFS_LOOKUP_LE;
- *stat = 0;
- return 0;
- }
- /*
- * Binary search the block.
- */
- while (low <= high) {
- xfs_extlen_t blockcount; /* key value */
- xfs_agblock_t startblock; /* key value */
-
- XFS_STATS_INC(xs_abt_compare);
- /*
- * keyno is average of low and high.
- */
- keyno = (low + high) >> 1;
- /*
- * Get startblock & blockcount.
- */
- if (level > 0) {
- xfs_alloc_key_t *kkp;
-
- kkp = kkbase + keyno - 1;
- startblock = be32_to_cpu(kkp->ar_startblock);
- blockcount = be32_to_cpu(kkp->ar_blockcount);
- } else {
- xfs_alloc_rec_t *krp;
-
- krp = krbase + keyno - 1;
- startblock = be32_to_cpu(krp->ar_startblock);
- blockcount = be32_to_cpu(krp->ar_blockcount);
- }
- /*
- * Compute difference to get next direction.
- */
- if (cur->bc_btnum == XFS_BTNUM_BNO)
- diff = (int)startblock -
- (int)cur->bc_rec.a.ar_startblock;
- else if (!(diff = (int)blockcount -
- (int)cur->bc_rec.a.ar_blockcount))
- diff = (int)startblock -
- (int)cur->bc_rec.a.ar_startblock;
- /*
- * Less than, move right.
- */
- if (diff < 0)
- low = keyno + 1;
- /*
- * Greater than, move left.
- */
- else if (diff > 0)
- high = keyno - 1;
- /*
- * Equal, we're done.
- */
- else
- break;
- }
- }
- /*
- * If there are more levels, set up for the next level
- * by getting the block number and filling in the cursor.
- */
- if (level > 0) {
- /*
- * If we moved left, need the previous key number,
- * unless there isn't one.
- */
- if (diff > 0 && --keyno < 1)
- keyno = 1;
- agbno = be32_to_cpu(*XFS_ALLOC_PTR_ADDR(block, keyno, cur));
-#ifdef DEBUG
- if ((error = xfs_btree_check_sptr(cur, agbno, level)))
- return error;
-#endif
- cur->bc_ptrs[level] = keyno;
- }
- }
- /*
- * Done with the search.
- * See if we need to adjust the results.
- */
- if (dir != XFS_LOOKUP_LE && diff < 0) {
- keyno++;
- /*
- * If ge search and we went off the end of the block, but it's
- * not the last block, we're in the wrong block.
- */
- if (dir == XFS_LOOKUP_GE &&
- keyno > be16_to_cpu(block->bb_numrecs) &&
- be32_to_cpu(block->bb_rightsib) != NULLAGBLOCK) {
- int i;
-
- cur->bc_ptrs[0] = keyno;
- if ((error = xfs_alloc_increment(cur, 0, &i)))
- return error;
- XFS_WANT_CORRUPTED_RETURN(i == 1);
- *stat = 1;
- return 0;
- }
- }
- else if (dir == XFS_LOOKUP_LE && diff > 0)
- keyno--;
- cur->bc_ptrs[0] = keyno;
- /*
- * Return if we succeeded or not.
- */
- if (keyno == 0 || keyno > be16_to_cpu(block->bb_numrecs))
- *stat = 0;
- else
- *stat = ((dir != XFS_LOOKUP_EQ) || (diff == 0));
- return 0;
-}
-
-/*
- * Move 1 record left from cur/level if possible.
- * Update cur to reflect the new path.
- */
-STATIC int /* error */
-xfs_alloc_lshift(
- xfs_btree_cur_t *cur, /* btree cursor */
- int level, /* level to shift record on */
- int *stat) /* success/failure */
-{
- int error; /* error return value */
-#ifdef DEBUG
- int i; /* loop index */
-#endif
- xfs_alloc_key_t key; /* key value for leaf level upward */
- xfs_buf_t *lbp; /* buffer for left neighbor block */
- xfs_alloc_block_t *left; /* left neighbor btree block */
- int nrec; /* new number of left block entries */
- xfs_buf_t *rbp; /* buffer for right (current) block */
- xfs_alloc_block_t *right; /* right (current) btree block */
- xfs_alloc_key_t *rkp=NULL; /* key pointer for right block */
- xfs_alloc_ptr_t *rpp=NULL; /* address pointer for right block */
- xfs_alloc_rec_t *rrp=NULL; /* record pointer for right block */
-
- /*
- * Set up variables for this block as "right".
- */
- rbp = cur->bc_bufs[level];
- right = XFS_BUF_TO_ALLOC_BLOCK(rbp);
-#ifdef DEBUG
- if ((error = xfs_btree_check_sblock(cur, right, level, rbp)))
- return error;
-#endif
- /*
- * If we've got no left sibling then we can't shift an entry left.
- */
- if (be32_to_cpu(right->bb_leftsib) == NULLAGBLOCK) {
- *stat = 0;
- return 0;
- }
- /*
- * If the cursor entry is the one that would be moved, don't
- * do it... it's too complicated.
- */
- if (cur->bc_ptrs[level] <= 1) {
- *stat = 0;
- return 0;
- }
- /*
- * Set up the left neighbor as "left".
- */
- if ((error = xfs_btree_read_bufs(cur->bc_mp, cur->bc_tp,
- cur->bc_private.a.agno, be32_to_cpu(right->bb_leftsib),
- 0, &lbp, XFS_ALLOC_BTREE_REF)))
- return error;
- left = XFS_BUF_TO_ALLOC_BLOCK(lbp);
- if ((error = xfs_btree_check_sblock(cur, left, level, lbp)))
- return error;
- /*
- * If it's full, it can't take another entry.
- */
- if (be16_to_cpu(left->bb_numrecs) == XFS_ALLOC_BLOCK_MAXRECS(level, cur)) {
- *stat = 0;
- return 0;
- }
- nrec = be16_to_cpu(left->bb_numrecs) + 1;
- /*
- * If non-leaf, copy a key and a ptr to the left block.
- */
- if (level > 0) {
- xfs_alloc_key_t *lkp; /* key pointer for left block */
- xfs_alloc_ptr_t *lpp; /* address pointer for left block */
-
- lkp = XFS_ALLOC_KEY_ADDR(left, nrec, cur);
- rkp = XFS_ALLOC_KEY_ADDR(right, 1, cur);
- *lkp = *rkp;
- xfs_alloc_log_keys(cur, lbp, nrec, nrec);
- lpp = XFS_ALLOC_PTR_ADDR(left, nrec, cur);
- rpp = XFS_ALLOC_PTR_ADDR(right, 1, cur);
-#ifdef DEBUG
- if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(*rpp), level)))
- return error;
-#endif
- *lpp = *rpp;
- xfs_alloc_log_ptrs(cur, lbp, nrec, nrec);
- xfs_btree_check_key(cur->bc_btnum, lkp - 1, lkp);
- }
- /*
- * If leaf, copy a record to the left block.
- */
- else {
- xfs_alloc_rec_t *lrp; /* record pointer for left block */
-
- lrp = XFS_ALLOC_REC_ADDR(left, nrec, cur);
- rrp = XFS_ALLOC_REC_ADDR(right, 1, cur);
- *lrp = *rrp;
- xfs_alloc_log_recs(cur, lbp, nrec, nrec);
- xfs_btree_check_rec(cur->bc_btnum, lrp - 1, lrp);
- }
- /*
- * Bump and log left's numrecs, decrement and log right's numrecs.
- */
- be16_add(&left->bb_numrecs, 1);
- xfs_alloc_log_block(cur->bc_tp, lbp, XFS_BB_NUMRECS);
- be16_add(&right->bb_numrecs, -1);
- xfs_alloc_log_block(cur->bc_tp, rbp, XFS_BB_NUMRECS);
- /*
- * Slide the contents of right down one entry.
- */
- if (level > 0) {
-#ifdef DEBUG
- for (i = 0; i < be16_to_cpu(right->bb_numrecs); i++) {
- if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(rpp[i + 1]),
- level)))
- return error;
- }
-#endif
- memmove(rkp, rkp + 1, be16_to_cpu(right->bb_numrecs) * sizeof(*rkp));
- memmove(rpp, rpp + 1, be16_to_cpu(right->bb_numrecs) * sizeof(*rpp));
- xfs_alloc_log_keys(cur, rbp, 1, be16_to_cpu(right->bb_numrecs));
- xfs_alloc_log_ptrs(cur, rbp, 1, be16_to_cpu(right->bb_numrecs));
- } else {
- memmove(rrp, rrp + 1, be16_to_cpu(right->bb_numrecs) * sizeof(*rrp));
- xfs_alloc_log_recs(cur, rbp, 1, be16_to_cpu(right->bb_numrecs));
- key.ar_startblock = rrp->ar_startblock;
- key.ar_blockcount = rrp->ar_blockcount;
- rkp = &key;
- }
- /*
- * Update the parent key values of right.
- */
- if ((error = xfs_alloc_updkey(cur, rkp, level + 1)))
- return error;
- /*
- * Slide the cursor value left one.
- */
- cur->bc_ptrs[level]--;
- *stat = 1;
- return 0;
-}
-
-/*
* Allocate a new root block, fill it in.
*/
STATIC int /* error */
/*
* Get a buffer from the freelist blocks, for the new root.
*/
- if ((error = xfs_alloc_get_freelist(cur->bc_tp, cur->bc_private.a.agbp,
- &nbno)))
+ error = xfs_alloc_get_freelist(cur->bc_tp,
+ cur->bc_private.a.agbp, &nbno, 1);
+ if (error)
return error;
/*
* None available, we fail.
agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
agf->agf_roots[cur->bc_btnum] = cpu_to_be32(nbno);
- be32_add(&agf->agf_levels[cur->bc_btnum], 1);
+ be32_add_cpu(&agf->agf_levels[cur->bc_btnum], 1);
seqno = be32_to_cpu(agf->agf_seqno);
mp->m_perag[seqno].pagf_levels[cur->bc_btnum]++;
xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp,
return 0;
}
+
/*
- * Move 1 record right from cur/level if possible.
- * Update cur to reflect the new path.
+ * Externally visible routines.
*/
-STATIC int /* error */
-xfs_alloc_rshift(
- xfs_btree_cur_t *cur, /* btree cursor */
- int level, /* level to shift record on */
- int *stat) /* success/failure */
+
+/*
+ * Delete the record pointed to by cur.
+ * The cursor refers to the place where the record was (could be inserted)
+ * when the operation returns.
+ */
+int /* error */
+xfs_alloc_delete(
+ xfs_btree_cur_t *cur, /* btree cursor */
+ int *stat) /* success/failure */
{
- int error; /* error return value */
- int i; /* loop index */
- xfs_alloc_key_t key; /* key value for leaf level upward */
- xfs_buf_t *lbp; /* buffer for left (current) block */
- xfs_alloc_block_t *left; /* left (current) btree block */
- xfs_buf_t *rbp; /* buffer for right neighbor block */
- xfs_alloc_block_t *right; /* right neighbor btree block */
- xfs_alloc_key_t *rkp; /* key pointer for right block */
- xfs_btree_cur_t *tcur; /* temporary cursor */
+ int error; /* error return value */
+ int i; /* result code */
+ int level; /* btree level */
/*
- * Set up variables for this block as "left".
- */
- lbp = cur->bc_bufs[level];
- left = XFS_BUF_TO_ALLOC_BLOCK(lbp);
-#ifdef DEBUG
- if ((error = xfs_btree_check_sblock(cur, left, level, lbp)))
- return error;
-#endif
- /*
- * If we've got no right sibling then we can't shift an entry right.
- */
- if (be32_to_cpu(left->bb_rightsib) == NULLAGBLOCK) {
- *stat = 0;
- return 0;
- }
- /*
- * If the cursor entry is the one that would be moved, don't
- * do it... it's too complicated.
- */
- if (cur->bc_ptrs[level] >= be16_to_cpu(left->bb_numrecs)) {
- *stat = 0;
- return 0;
- }
- /*
- * Set up the right neighbor as "right".
- */
- if ((error = xfs_btree_read_bufs(cur->bc_mp, cur->bc_tp,
- cur->bc_private.a.agno, be32_to_cpu(left->bb_rightsib),
- 0, &rbp, XFS_ALLOC_BTREE_REF)))
- return error;
- right = XFS_BUF_TO_ALLOC_BLOCK(rbp);
- if ((error = xfs_btree_check_sblock(cur, right, level, rbp)))
- return error;
- /*
- * If it's full, it can't take another entry.
+ * 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.
*/
- if (be16_to_cpu(right->bb_numrecs) == XFS_ALLOC_BLOCK_MAXRECS(level, cur)) {
- *stat = 0;
- return 0;
+ for (level = 0, i = 2; i == 2; level++) {
+ if ((error = xfs_alloc_delrec(cur, level, &i)))
+ return error;
}
- /*
- * Make a hole at the start of the right neighbor block, then
- * copy the last left block entry to the hole.
- */
- if (level > 0) {
- xfs_alloc_key_t *lkp; /* key pointer for left block */
- xfs_alloc_ptr_t *lpp; /* address pointer for left block */
- xfs_alloc_ptr_t *rpp; /* address pointer for right block */
-
- lkp = XFS_ALLOC_KEY_ADDR(left, be16_to_cpu(left->bb_numrecs), cur);
- lpp = XFS_ALLOC_PTR_ADDR(left, be16_to_cpu(left->bb_numrecs), cur);
- rkp = XFS_ALLOC_KEY_ADDR(right, 1, cur);
- rpp = XFS_ALLOC_PTR_ADDR(right, 1, cur);
-#ifdef DEBUG
- for (i = be16_to_cpu(right->bb_numrecs) - 1; i >= 0; i--) {
- if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(rpp[i]), level)))
- return error;
+ 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;
+ }
}
-#endif
- memmove(rkp + 1, rkp, be16_to_cpu(right->bb_numrecs) * sizeof(*rkp));
- memmove(rpp + 1, rpp, be16_to_cpu(right->bb_numrecs) * sizeof(*rpp));
-#ifdef DEBUG
- if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(*lpp), level)))
- return error;
-#endif
- *rkp = *lkp;
- *rpp = *lpp;
- xfs_alloc_log_keys(cur, rbp, 1, be16_to_cpu(right->bb_numrecs) + 1);
- xfs_alloc_log_ptrs(cur, rbp, 1, be16_to_cpu(right->bb_numrecs) + 1);
- xfs_btree_check_key(cur->bc_btnum, rkp, rkp + 1);
- } else {
- xfs_alloc_rec_t *lrp; /* record pointer for left block */
- xfs_alloc_rec_t *rrp; /* record pointer for right block */
-
- lrp = XFS_ALLOC_REC_ADDR(left, be16_to_cpu(left->bb_numrecs), cur);
- rrp = XFS_ALLOC_REC_ADDR(right, 1, cur);
- memmove(rrp + 1, rrp, be16_to_cpu(right->bb_numrecs) * sizeof(*rrp));
- *rrp = *lrp;
- xfs_alloc_log_recs(cur, rbp, 1, be16_to_cpu(right->bb_numrecs) + 1);
- key.ar_startblock = rrp->ar_startblock;
- key.ar_blockcount = rrp->ar_blockcount;
- rkp = &key;
- xfs_btree_check_rec(cur->bc_btnum, rrp, rrp + 1);
}
- /*
- * Decrement and log left's numrecs, bump and log right's numrecs.
- */
- be16_add(&left->bb_numrecs, -1);
- xfs_alloc_log_block(cur->bc_tp, lbp, XFS_BB_NUMRECS);
- be16_add(&right->bb_numrecs, 1);
- xfs_alloc_log_block(cur->bc_tp, rbp, XFS_BB_NUMRECS);
- /*
- * Using a temporary cursor, update the parent key values of the
- * block on the right.
- */
- if ((error = xfs_btree_dup_cursor(cur, &tcur)))
- return error;
- i = xfs_btree_lastrec(tcur, level);
- XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
- if ((error = xfs_alloc_increment(tcur, level, &i)) ||
- (error = xfs_alloc_updkey(tcur, rkp, level + 1)))
- goto error0;
- xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
- *stat = 1;
+ *stat = i;
return 0;
-error0:
- xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR);
- return error;
}
/*
- * Split cur/level block in half.
- * Return new block number and its first record (to be inserted into parent).
+ * Get the data from the pointed-to record.
*/
-STATIC int /* error */
-xfs_alloc_split(
+int /* error */
+xfs_alloc_get_rec(
xfs_btree_cur_t *cur, /* btree cursor */
- int level, /* level to split */
- xfs_agblock_t *bnop, /* output: block number allocated */
- xfs_alloc_key_t *keyp, /* output: first key of new block */
- xfs_btree_cur_t **curp, /* output: new cursor */
- int *stat) /* success/failure */
+ xfs_agblock_t *bno, /* output: starting block of extent */
+ xfs_extlen_t *len, /* output: length of extent */
+ int *stat) /* output: success/failure */
{
+ xfs_alloc_block_t *block; /* btree block */
+#ifdef DEBUG
int error; /* error return value */
- int i; /* loop index/record number */
- xfs_agblock_t lbno; /* left (current) block number */
- xfs_buf_t *lbp; /* buffer for left block */
- xfs_alloc_block_t *left; /* left (current) btree block */
- xfs_agblock_t rbno; /* right (new) block number */
- xfs_buf_t *rbp; /* buffer for right block */
- xfs_alloc_block_t *right; /* right (new) btree block */
-
- /*
- * Allocate the new block from the freelist.
- * If we can't do it, we're toast. Give up.
- */
- if ((error = xfs_alloc_get_freelist(cur->bc_tp, cur->bc_private.a.agbp,
- &rbno)))
- return error;
- if (rbno == NULLAGBLOCK) {
- *stat = 0;
- return 0;
- }
- xfs_trans_agbtree_delta(cur->bc_tp, 1);
- rbp = xfs_btree_get_bufs(cur->bc_mp, cur->bc_tp, cur->bc_private.a.agno,
- rbno, 0);
- /*
- * Set up the new block as "right".
- */
- right = XFS_BUF_TO_ALLOC_BLOCK(rbp);
- /*
- * "Left" is the current (according to the cursor) block.
- */
- lbp = cur->bc_bufs[level];
- left = XFS_BUF_TO_ALLOC_BLOCK(lbp);
-#ifdef DEBUG
- if ((error = xfs_btree_check_sblock(cur, left, level, lbp)))
- return error;
-#endif
- /*
- * Fill in the btree header for the new block.
- */
- right->bb_magic = cpu_to_be32(xfs_magics[cur->bc_btnum]);
- right->bb_level = left->bb_level;
- right->bb_numrecs = cpu_to_be16(be16_to_cpu(left->bb_numrecs) / 2);
- /*
- * Make sure that if there's an odd number of entries now, that
- * each new block will have the same number of entries.
- */
- if ((be16_to_cpu(left->bb_numrecs) & 1) &&
- cur->bc_ptrs[level] <= be16_to_cpu(right->bb_numrecs) + 1)
- be16_add(&right->bb_numrecs, 1);
- i = be16_to_cpu(left->bb_numrecs) - be16_to_cpu(right->bb_numrecs) + 1;
- /*
- * For non-leaf blocks, copy keys and addresses over to the new block.
- */
- if (level > 0) {
- xfs_alloc_key_t *lkp; /* left btree key pointer */
- xfs_alloc_ptr_t *lpp; /* left btree address pointer */
- xfs_alloc_key_t *rkp; /* right btree key pointer */
- xfs_alloc_ptr_t *rpp; /* right btree address pointer */
-
- lkp = XFS_ALLOC_KEY_ADDR(left, i, cur);
- lpp = XFS_ALLOC_PTR_ADDR(left, i, cur);
- rkp = XFS_ALLOC_KEY_ADDR(right, 1, cur);
- rpp = XFS_ALLOC_PTR_ADDR(right, 1, cur);
-#ifdef DEBUG
- for (i = 0; i < be16_to_cpu(right->bb_numrecs); i++) {
- if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(lpp[i]), level)))
- return error;
- }
-#endif
- memcpy(rkp, lkp, be16_to_cpu(right->bb_numrecs) * sizeof(*rkp));
- memcpy(rpp, lpp, be16_to_cpu(right->bb_numrecs) * sizeof(*rpp));
- xfs_alloc_log_keys(cur, rbp, 1, be16_to_cpu(right->bb_numrecs));
- xfs_alloc_log_ptrs(cur, rbp, 1, be16_to_cpu(right->bb_numrecs));
- *keyp = *rkp;
- }
- /*
- * For leaf blocks, copy records over to the new block.
- */
- else {
- xfs_alloc_rec_t *lrp; /* left btree record pointer */
- xfs_alloc_rec_t *rrp; /* right btree record pointer */
-
- lrp = XFS_ALLOC_REC_ADDR(left, i, cur);
- rrp = XFS_ALLOC_REC_ADDR(right, 1, cur);
- memcpy(rrp, lrp, be16_to_cpu(right->bb_numrecs) * sizeof(*rrp));
- xfs_alloc_log_recs(cur, rbp, 1, be16_to_cpu(right->bb_numrecs));
- keyp->ar_startblock = rrp->ar_startblock;
- keyp->ar_blockcount = rrp->ar_blockcount;
- }
- /*
- * Find the left block number by looking in the buffer.
- * Adjust numrecs, sibling pointers.
- */
- lbno = XFS_DADDR_TO_AGBNO(cur->bc_mp, XFS_BUF_ADDR(lbp));
- be16_add(&left->bb_numrecs, -(be16_to_cpu(right->bb_numrecs)));
- right->bb_rightsib = left->bb_rightsib;
- left->bb_rightsib = cpu_to_be32(rbno);
- right->bb_leftsib = cpu_to_be32(lbno);
- xfs_alloc_log_block(cur->bc_tp, rbp, XFS_BB_ALL_BITS);
- xfs_alloc_log_block(cur->bc_tp, lbp, XFS_BB_NUMRECS | XFS_BB_RIGHTSIB);
- /*
- * If there's a block to the new block's right, make that block
- * point back to right instead of to left.
- */
- if (be32_to_cpu(right->bb_rightsib) != NULLAGBLOCK) {
- xfs_alloc_block_t *rrblock; /* rr btree block */
- xfs_buf_t *rrbp; /* buffer for rrblock */
-
- if ((error = xfs_btree_read_bufs(cur->bc_mp, cur->bc_tp,
- cur->bc_private.a.agno, be32_to_cpu(right->bb_rightsib), 0,
- &rrbp, XFS_ALLOC_BTREE_REF)))
- return error;
- rrblock = XFS_BUF_TO_ALLOC_BLOCK(rrbp);
- if ((error = xfs_btree_check_sblock(cur, rrblock, level, rrbp)))
- return error;
- rrblock->bb_leftsib = cpu_to_be32(rbno);
- xfs_alloc_log_block(cur->bc_tp, rrbp, XFS_BB_LEFTSIB);
- }
- /*
- * If the cursor is really in the right block, move it there.
- * If it's just pointing past the last entry in left, then we'll
- * insert there, so don't change anything in that case.
- */
- if (cur->bc_ptrs[level] > be16_to_cpu(left->bb_numrecs) + 1) {
- xfs_btree_setbuf(cur, level, rbp);
- cur->bc_ptrs[level] -= be16_to_cpu(left->bb_numrecs);
- }
- /*
- * If there are more levels, we'll need another cursor which refers to
- * the right block, no matter where this cursor was.
- */
- if (level + 1 < cur->bc_nlevels) {
- if ((error = xfs_btree_dup_cursor(cur, curp)))
- return error;
- (*curp)->bc_ptrs[level + 1]++;
- }
- *bnop = rbno;
- *stat = 1;
- return 0;
-}
-
-/*
- * Update keys at all levels from here to the root along the cursor's path.
- */
-STATIC int /* error */
-xfs_alloc_updkey(
- xfs_btree_cur_t *cur, /* btree cursor */
- xfs_alloc_key_t *keyp, /* new key value to update to */
- int level) /* starting level for update */
-{
- int ptr; /* index of key in block */
-
- /*
- * Go up the tree from this level toward the root.
- * At each level, update the key value to the value input.
- * Stop when we reach a level where the cursor isn't pointing
- * at the first entry in the block.
- */
- for (ptr = 1; ptr == 1 && level < cur->bc_nlevels; level++) {
- xfs_alloc_block_t *block; /* btree block */
- xfs_buf_t *bp; /* buffer for block */
-#ifdef DEBUG
- int error; /* error return value */
-#endif
- xfs_alloc_key_t *kp; /* ptr to btree block keys */
-
- bp = cur->bc_bufs[level];
- block = XFS_BUF_TO_ALLOC_BLOCK(bp);
-#ifdef DEBUG
- if ((error = xfs_btree_check_sblock(cur, block, level, bp)))
- return error;
-#endif
- ptr = cur->bc_ptrs[level];
- kp = XFS_ALLOC_KEY_ADDR(block, ptr, cur);
- *kp = *keyp;
- xfs_alloc_log_keys(cur, bp, ptr, ptr);
- }
- return 0;
-}
-
-/*
- * Externally visible routines.
- */
-
-/*
- * Decrement cursor by one record at the level.
- * For nonzero levels the leaf-ward information is untouched.
- */
-int /* error */
-xfs_alloc_decrement(
- xfs_btree_cur_t *cur, /* btree cursor */
- int level, /* level in btree, 0 is leaf */
- int *stat) /* success/failure */
-{
- xfs_alloc_block_t *block; /* btree block */
- int error; /* error return value */
- int lev; /* btree level */
-
- ASSERT(level < cur->bc_nlevels);
- /*
- * Read-ahead to the left at this level.
- */
- xfs_btree_readahead(cur, level, XFS_BTCUR_LEFTRA);
- /*
- * Decrement the ptr at this level. If we're still in the block
- * then we're done.
- */
- if (--cur->bc_ptrs[level] > 0) {
- *stat = 1;
- return 0;
- }
- /*
- * Get a pointer to the btree block.
- */
- block = XFS_BUF_TO_ALLOC_BLOCK(cur->bc_bufs[level]);
-#ifdef DEBUG
- if ((error = xfs_btree_check_sblock(cur, block, level,
- cur->bc_bufs[level])))
- return error;
-#endif
- /*
- * If we just went off the left edge of the tree, return failure.
- */
- if (be32_to_cpu(block->bb_leftsib) == NULLAGBLOCK) {
- *stat = 0;
- return 0;
- }
- /*
- * March up the tree decrementing pointers.
- * Stop when we don't go off the left edge of a block.
- */
- for (lev = level + 1; lev < cur->bc_nlevels; lev++) {
- if (--cur->bc_ptrs[lev] > 0)
- break;
- /*
- * Read-ahead the left block, we're going to read it
- * in the next loop.
- */
- xfs_btree_readahead(cur, lev, XFS_BTCUR_LEFTRA);
- }
- /*
- * If we went off the root then we are seriously confused.
- */
- ASSERT(lev < cur->bc_nlevels);
- /*
- * Now walk back down the tree, fixing up the cursor's buffer
- * pointers and key numbers.
- */
- for (block = XFS_BUF_TO_ALLOC_BLOCK(cur->bc_bufs[lev]); lev > level; ) {
- xfs_agblock_t agbno; /* block number of btree block */
- xfs_buf_t *bp; /* buffer pointer for block */
-
- agbno = be32_to_cpu(*XFS_ALLOC_PTR_ADDR(block, cur->bc_ptrs[lev], cur));
- if ((error = xfs_btree_read_bufs(cur->bc_mp, cur->bc_tp,
- cur->bc_private.a.agno, agbno, 0, &bp,
- XFS_ALLOC_BTREE_REF)))
- return error;
- lev--;
- xfs_btree_setbuf(cur, lev, bp);
- block = XFS_BUF_TO_ALLOC_BLOCK(bp);
- if ((error = xfs_btree_check_sblock(cur, block, lev, bp)))
- return error;
- cur->bc_ptrs[lev] = be16_to_cpu(block->bb_numrecs);
- }
- *stat = 1;
- return 0;
-}
-
-/*
- * Delete the record pointed to by cur.
- * The cursor refers to the place where the record was (could be inserted)
- * when the operation returns.
- */
-int /* error */
-xfs_alloc_delete(
- xfs_btree_cur_t *cur, /* btree cursor */
- int *stat) /* success/failure */
-{
- int error; /* error return value */
- int i; /* result code */
- int level; /* btree level */
-
- /*
- * Go up the tree, starting at leaf level.
- * If 2 is returned then a join was done; go to the next level.
- * Otherwise we are done.
- */
- for (level = 0, i = 2; i == 2; level++) {
- if ((error = xfs_alloc_delrec(cur, level, &i)))
- return error;
- }
- if (i == 0) {
- for (level = 1; level < cur->bc_nlevels; level++) {
- if (cur->bc_ptrs[level] == 0) {
- if ((error = xfs_alloc_decrement(cur, level, &i)))
- return error;
- break;
- }
- }
- }
- *stat = i;
- return 0;
-}
-
-/*
- * Get the data from the pointed-to record.
- */
-int /* error */
-xfs_alloc_get_rec(
- xfs_btree_cur_t *cur, /* btree cursor */
- xfs_agblock_t *bno, /* output: starting block of extent */
- xfs_extlen_t *len, /* output: length of extent */
- int *stat) /* output: success/failure */
-{
- xfs_alloc_block_t *block; /* btree block */
-#ifdef DEBUG
- int error; /* error return value */
-#endif
- int ptr; /* record number */
+#endif
+ int ptr; /* record number */
ptr = cur->bc_ptrs[0];
block = XFS_BUF_TO_ALLOC_BLOCK(cur->bc_bufs[0]);
}
/*
- * Increment cursor by one record at the level.
- * For nonzero levels the leaf-ward information is untouched.
- */
-int /* error */
-xfs_alloc_increment(
- xfs_btree_cur_t *cur, /* btree cursor */
- int level, /* level in btree, 0 is leaf */
- int *stat) /* success/failure */
-{
- xfs_alloc_block_t *block; /* btree block */
- xfs_buf_t *bp; /* tree block buffer */
- int error; /* error return value */
- int lev; /* btree level */
-
- ASSERT(level < cur->bc_nlevels);
- /*
- * Read-ahead to the right at this level.
- */
- xfs_btree_readahead(cur, level, XFS_BTCUR_RIGHTRA);
- /*
- * Get a pointer to the btree block.
- */
- bp = cur->bc_bufs[level];
- block = XFS_BUF_TO_ALLOC_BLOCK(bp);
-#ifdef DEBUG
- if ((error = xfs_btree_check_sblock(cur, block, level, bp)))
- return error;
-#endif
- /*
- * Increment the ptr at this level. If we're still in the block
- * then we're done.
- */
- if (++cur->bc_ptrs[level] <= be16_to_cpu(block->bb_numrecs)) {
- *stat = 1;
- return 0;
- }
- /*
- * If we just went off the right edge of the tree, return failure.
- */
- if (be32_to_cpu(block->bb_rightsib) == NULLAGBLOCK) {
- *stat = 0;
- return 0;
- }
- /*
- * March up the tree incrementing pointers.
- * Stop when we don't go off the right edge of a block.
- */
- for (lev = level + 1; lev < cur->bc_nlevels; lev++) {
- bp = cur->bc_bufs[lev];
- block = XFS_BUF_TO_ALLOC_BLOCK(bp);
-#ifdef DEBUG
- if ((error = xfs_btree_check_sblock(cur, block, lev, bp)))
- return error;
-#endif
- if (++cur->bc_ptrs[lev] <= be16_to_cpu(block->bb_numrecs))
- break;
- /*
- * Read-ahead the right block, we're going to read it
- * in the next loop.
- */
- xfs_btree_readahead(cur, lev, XFS_BTCUR_RIGHTRA);
- }
- /*
- * If we went off the root then we are seriously confused.
- */
- ASSERT(lev < cur->bc_nlevels);
- /*
- * Now walk back down the tree, fixing up the cursor's buffer
- * pointers and key numbers.
- */
- for (bp = cur->bc_bufs[lev], block = XFS_BUF_TO_ALLOC_BLOCK(bp);
- lev > level; ) {
- xfs_agblock_t agbno; /* block number of btree block */
-
- agbno = be32_to_cpu(*XFS_ALLOC_PTR_ADDR(block, cur->bc_ptrs[lev], cur));
- if ((error = xfs_btree_read_bufs(cur->bc_mp, cur->bc_tp,
- cur->bc_private.a.agno, agbno, 0, &bp,
- XFS_ALLOC_BTREE_REF)))
- return error;
- lev--;
- xfs_btree_setbuf(cur, lev, bp);
- block = XFS_BUF_TO_ALLOC_BLOCK(bp);
- if ((error = xfs_btree_check_sblock(cur, block, lev, bp)))
- return error;
- cur->bc_ptrs[lev] = 1;
- }
- *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.
*/
nbno = NULLAGBLOCK;
nrec.ar_startblock = cpu_to_be32(cur->bc_rec.a.ar_startblock);
nrec.ar_blockcount = cpu_to_be32(cur->bc_rec.a.ar_blockcount);
- ncur = (xfs_btree_cur_t *)0;
+ ncur = NULL;
pcur = cur;
/*
* Loop going up the tree, starting at the leaf level.
*/
if (ncur) {
pcur = ncur;
- ncur = (xfs_btree_cur_t *)0;
+ ncur = NULL;
}
} while (nbno != NULLAGBLOCK);
*stat = i;
return 0;
}
-/*
- * Lookup the record equal to [bno, len] in the btree given by cur.
- */
-int /* error */
-xfs_alloc_lookup_eq(
- xfs_btree_cur_t *cur, /* btree cursor */
- xfs_agblock_t bno, /* starting block of extent */
- xfs_extlen_t len, /* length of extent */
- int *stat) /* success/failure */
+STATIC struct xfs_btree_cur *
+xfs_allocbt_dup_cursor(
+ struct xfs_btree_cur *cur)
{
- cur->bc_rec.a.ar_startblock = bno;
- cur->bc_rec.a.ar_blockcount = len;
- return xfs_alloc_lookup(cur, XFS_LOOKUP_EQ, stat);
+ return xfs_allocbt_init_cursor(cur->bc_mp, cur->bc_tp,
+ cur->bc_private.a.agbp, cur->bc_private.a.agno,
+ cur->bc_btnum);
}
-/*
- * Lookup the first record greater than or equal to [bno, len]
- * in the btree given by cur.
- */
-int /* error */
-xfs_alloc_lookup_ge(
- xfs_btree_cur_t *cur, /* btree cursor */
- xfs_agblock_t bno, /* starting block of extent */
- xfs_extlen_t len, /* length of extent */
- int *stat) /* success/failure */
+STATIC int
+xfs_allocbt_alloc_block(
+ struct xfs_btree_cur *cur,
+ union xfs_btree_ptr *start,
+ union xfs_btree_ptr *new,
+ int length,
+ int *stat)
{
- cur->bc_rec.a.ar_startblock = bno;
- cur->bc_rec.a.ar_blockcount = len;
- return xfs_alloc_lookup(cur, XFS_LOOKUP_GE, stat);
-}
+ int error;
+ xfs_agblock_t bno;
-/*
- * Lookup the first record less than or equal to [bno, len]
- * in the btree given by cur.
- */
-int /* error */
-xfs_alloc_lookup_le(
- xfs_btree_cur_t *cur, /* btree cursor */
- xfs_agblock_t bno, /* starting block of extent */
- xfs_extlen_t len, /* length of extent */
- int *stat) /* success/failure */
-{
- cur->bc_rec.a.ar_startblock = bno;
- cur->bc_rec.a.ar_blockcount = len;
- return xfs_alloc_lookup(cur, XFS_LOOKUP_LE, stat);
+ XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
+
+ /* Allocate the new block from the freelist. If we can't, give up. */
+ error = xfs_alloc_get_freelist(cur->bc_tp, cur->bc_private.a.agbp,
+ &bno, 1);
+ if (error) {
+ XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
+ return error;
+ }
+
+ if (bno == NULLAGBLOCK) {
+ XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
+ *stat = 0;
+ return 0;
+ }
+
+ xfs_trans_agbtree_delta(cur->bc_tp, 1);
+ new->s = cpu_to_be32(bno);
+
+ XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
+ *stat = 1;
+ return 0;
}
/*
- * Update the record referred to by cur, to the value given by [bno, len].
- * This either works (return 0) or gets an EFSCORRUPTED error.
+ * Update the longest extent in the AGF
*/
-int /* error */
-xfs_alloc_update(
- xfs_btree_cur_t *cur, /* btree cursor */
- xfs_agblock_t bno, /* starting block of extent */
- xfs_extlen_t len) /* length of extent */
+STATIC void
+xfs_allocbt_update_lastrec(
+ struct xfs_btree_cur *cur,
+ struct xfs_btree_block *block,
+ union xfs_btree_rec *rec,
+ int ptr,
+ int reason)
{
- xfs_alloc_block_t *block; /* btree block to update */
- int error; /* error return value */
- int ptr; /* current record number (updating) */
+ struct xfs_agf *agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
+ xfs_agnumber_t seqno = be32_to_cpu(agf->agf_seqno);
+ __be32 len;
- ASSERT(len > 0);
- /*
- * Pick up the a.g. freelist struct and the current block.
- */
- block = XFS_BUF_TO_ALLOC_BLOCK(cur->bc_bufs[0]);
-#ifdef DEBUG
- if ((error = xfs_btree_check_sblock(cur, block, 0, cur->bc_bufs[0])))
- return error;
-#endif
- /*
- * Get the address of the rec to be updated.
- */
- ptr = cur->bc_ptrs[0];
- {
- xfs_alloc_rec_t *rp; /* pointer to updated record */
+ ASSERT(cur->bc_btnum == XFS_BTNUM_CNT);
- rp = XFS_ALLOC_REC_ADDR(block, ptr, cur);
+ switch (reason) {
+ case LASTREC_UPDATE:
/*
- * Fill in the new contents and log them.
+ * If this is the last leaf block and it's the last record,
+ * then update the size of the longest extent in the AG.
*/
- rp->ar_startblock = cpu_to_be32(bno);
- rp->ar_blockcount = cpu_to_be32(len);
- xfs_alloc_log_recs(cur, cur->bc_bufs[0], ptr, ptr);
+ if (ptr != xfs_btree_get_numrecs(block))
+ return;
+ len = rec->alloc.ar_blockcount;
+ break;
+ default:
+ ASSERT(0);
+ return;
}
- /*
- * If it's the by-size btree and it's the last leaf block and
- * it's the last record... then update the size of the longest
- * extent in the a.g., which we cache in the a.g. freelist header.
- */
- if (cur->bc_btnum == XFS_BTNUM_CNT &&
- be32_to_cpu(block->bb_rightsib) == NULLAGBLOCK &&
- ptr == be16_to_cpu(block->bb_numrecs)) {
- xfs_agf_t *agf; /* a.g. freespace header */
- xfs_agnumber_t seqno;
- agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
- seqno = be32_to_cpu(agf->agf_seqno);
- cur->bc_mp->m_perag[seqno].pagf_longest = len;
- agf->agf_longest = cpu_to_be32(len);
- xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp,
- XFS_AGF_LONGEST);
- }
- /*
- * Updating first record in leaf. Pass new key value up to our parent.
- */
- if (ptr == 1) {
- xfs_alloc_key_t key; /* key containing [bno, len] */
+ agf->agf_longest = len;
+ cur->bc_mp->m_perag[seqno].pagf_longest = be32_to_cpu(len);
+ xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp, XFS_AGF_LONGEST);
+}
- key.ar_startblock = cpu_to_be32(bno);
- key.ar_blockcount = cpu_to_be32(len);
- if ((error = xfs_alloc_updkey(cur, &key, 1)))
- return error;
+STATIC int
+xfs_allocbt_get_maxrecs(
+ struct xfs_btree_cur *cur,
+ int level)
+{
+ return cur->bc_mp->m_alloc_mxr[level != 0];
+}
+
+STATIC void
+xfs_allocbt_init_key_from_rec(
+ union xfs_btree_key *key,
+ union xfs_btree_rec *rec)
+{
+ ASSERT(rec->alloc.ar_startblock != 0);
+
+ key->alloc.ar_startblock = rec->alloc.ar_startblock;
+ key->alloc.ar_blockcount = rec->alloc.ar_blockcount;
+}
+
+STATIC void
+xfs_allocbt_init_ptr_from_cur(
+ struct xfs_btree_cur *cur,
+ union xfs_btree_ptr *ptr)
+{
+ struct xfs_agf *agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
+
+ ASSERT(cur->bc_private.a.agno == be32_to_cpu(agf->agf_seqno));
+ ASSERT(agf->agf_roots[cur->bc_btnum] != 0);
+
+ ptr->s = agf->agf_roots[cur->bc_btnum];
+}
+
+STATIC __int64_t
+xfs_allocbt_key_diff(
+ struct xfs_btree_cur *cur,
+ union xfs_btree_key *key)
+{
+ xfs_alloc_rec_incore_t *rec = &cur->bc_rec.a;
+ xfs_alloc_key_t *kp = &key->alloc;
+ __int64_t diff;
+
+ if (cur->bc_btnum == XFS_BTNUM_BNO) {
+ return (__int64_t)be32_to_cpu(kp->ar_startblock) -
+ rec->ar_startblock;
}
- return 0;
+
+ diff = (__int64_t)be32_to_cpu(kp->ar_blockcount) - rec->ar_blockcount;
+ if (diff)
+ return diff;
+
+ return (__int64_t)be32_to_cpu(kp->ar_startblock) - rec->ar_startblock;
+}
+
+#ifdef XFS_BTREE_TRACE
+ktrace_t *xfs_allocbt_trace_buf;
+
+STATIC void
+xfs_allocbt_trace_enter(
+ struct xfs_btree_cur *cur,
+ const char *func,
+ char *s,
+ int type,
+ int line,
+ __psunsigned_t a0,
+ __psunsigned_t a1,
+ __psunsigned_t a2,
+ __psunsigned_t a3,
+ __psunsigned_t a4,
+ __psunsigned_t a5,
+ __psunsigned_t a6,
+ __psunsigned_t a7,
+ __psunsigned_t a8,
+ __psunsigned_t a9,
+ __psunsigned_t a10)
+{
+ ktrace_enter(xfs_allocbt_trace_buf, (void *)(__psint_t)type,
+ (void *)func, (void *)s, NULL, (void *)cur,
+ (void *)a0, (void *)a1, (void *)a2, (void *)a3,
+ (void *)a4, (void *)a5, (void *)a6, (void *)a7,
+ (void *)a8, (void *)a9, (void *)a10);
+}
+
+STATIC void
+xfs_allocbt_trace_cursor(
+ struct xfs_btree_cur *cur,
+ __uint32_t *s0,
+ __uint64_t *l0,
+ __uint64_t *l1)
+{
+ *s0 = cur->bc_private.a.agno;
+ *l0 = cur->bc_rec.a.ar_startblock;
+ *l1 = cur->bc_rec.a.ar_blockcount;
+}
+
+STATIC void
+xfs_allocbt_trace_key(
+ struct xfs_btree_cur *cur,
+ union xfs_btree_key *key,
+ __uint64_t *l0,
+ __uint64_t *l1)
+{
+ *l0 = be32_to_cpu(key->alloc.ar_startblock);
+ *l1 = be32_to_cpu(key->alloc.ar_blockcount);
+}
+
+STATIC void
+xfs_allocbt_trace_record(
+ struct xfs_btree_cur *cur,
+ union xfs_btree_rec *rec,
+ __uint64_t *l0,
+ __uint64_t *l1,
+ __uint64_t *l2)
+{
+ *l0 = be32_to_cpu(rec->alloc.ar_startblock);
+ *l1 = be32_to_cpu(rec->alloc.ar_blockcount);
+ *l2 = 0;
+}
+#endif /* XFS_BTREE_TRACE */
+
+static const struct xfs_btree_ops xfs_allocbt_ops = {
+ .rec_len = sizeof(xfs_alloc_rec_t),
+ .key_len = sizeof(xfs_alloc_key_t),
+
+ .dup_cursor = xfs_allocbt_dup_cursor,
+ .alloc_block = xfs_allocbt_alloc_block,
+ .update_lastrec = xfs_allocbt_update_lastrec,
+ .get_maxrecs = xfs_allocbt_get_maxrecs,
+ .init_key_from_rec = xfs_allocbt_init_key_from_rec,
+ .init_ptr_from_cur = xfs_allocbt_init_ptr_from_cur,
+ .key_diff = xfs_allocbt_key_diff,
+
+#ifdef XFS_BTREE_TRACE
+ .trace_enter = xfs_allocbt_trace_enter,
+ .trace_cursor = xfs_allocbt_trace_cursor,
+ .trace_key = xfs_allocbt_trace_key,
+ .trace_record = xfs_allocbt_trace_record,
+#endif
+};
+
+/*
+ * Allocate a new allocation btree cursor.
+ */
+struct xfs_btree_cur * /* new alloc btree cursor */
+xfs_allocbt_init_cursor(
+ struct xfs_mount *mp, /* file system mount point */
+ struct xfs_trans *tp, /* transaction pointer */
+ struct xfs_buf *agbp, /* buffer for agf structure */
+ xfs_agnumber_t agno, /* allocation group number */
+ xfs_btnum_t btnum) /* btree identifier */
+{
+ struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
+ struct xfs_btree_cur *cur;
+
+ ASSERT(btnum == XFS_BTNUM_BNO || btnum == XFS_BTNUM_CNT);
+
+ cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
+
+ cur->bc_tp = tp;
+ cur->bc_mp = mp;
+ cur->bc_nlevels = be32_to_cpu(agf->agf_levels[btnum]);
+ cur->bc_btnum = btnum;
+ cur->bc_blocklog = mp->m_sb.sb_blocklog;
+
+ cur->bc_ops = &xfs_allocbt_ops;
+ if (btnum == XFS_BTNUM_CNT)
+ cur->bc_flags = XFS_BTREE_LASTREC_UPDATE;
+
+ cur->bc_private.a.agbp = agbp;
+ cur->bc_private.a.agno = agno;
+
+ return cur;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff