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[XFS] implement generic xfs_btree_delete/delrec

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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 <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 2008-10-30 16:58:01 +11:00 committed by Lachlan McIlroy
parent d4b3a4b7dd
commit 91cca5df9b
11 changed files with 723 additions and 1839 deletions
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14
fs/xfs/xfs_alloc.c
View File

@ -398,7 +398,7 @@ xfs_alloc_fixup_trees(
/*
* Delete the entry from the by-size btree.
*/
if ((error = xfs_alloc_delete(cnt_cur, &i)))
if ((error = xfs_btree_delete(cnt_cur, &i)))
return error;
XFS_WANT_CORRUPTED_RETURN(i == 1);
/*
@ -427,7 +427,7 @@ xfs_alloc_fixup_trees(
/*
* No remaining freespace, just delete the by-block tree entry.
*/
if ((error = xfs_alloc_delete(bno_cur, &i)))
if ((error = xfs_btree_delete(bno_cur, &i)))
return error;
XFS_WANT_CORRUPTED_RETURN(i == 1);
} else {
@ -1651,7 +1651,7 @@ xfs_free_ag_extent(
if ((error = xfs_alloc_lookup_eq(cnt_cur, ltbno, ltlen, &i)))
goto error0;
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
if ((error = xfs_alloc_delete(cnt_cur, &i)))
if ((error = xfs_btree_delete(cnt_cur, &i)))
goto error0;
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
/*
@ -1660,13 +1660,13 @@ xfs_free_ag_extent(
if ((error = xfs_alloc_lookup_eq(cnt_cur, gtbno, gtlen, &i)))
goto error0;
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
if ((error = xfs_alloc_delete(cnt_cur, &i)))
if ((error = xfs_btree_delete(cnt_cur, &i)))
goto error0;
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
/*
* Delete the old by-block entry for the right block.
*/
if ((error = xfs_alloc_delete(bno_cur, &i)))
if ((error = xfs_btree_delete(bno_cur, &i)))
goto error0;
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
/*
@ -1711,7 +1711,7 @@ xfs_free_ag_extent(
if ((error = xfs_alloc_lookup_eq(cnt_cur, ltbno, ltlen, &i)))
goto error0;
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
if ((error = xfs_alloc_delete(cnt_cur, &i)))
if ((error = xfs_btree_delete(cnt_cur, &i)))
goto error0;
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
/*
@ -1737,7 +1737,7 @@ xfs_free_ag_extent(
if ((error = xfs_alloc_lookup_eq(cnt_cur, gtbno, gtlen, &i)))
goto error0;
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
if ((error = xfs_alloc_delete(cnt_cur, &i)))
if ((error = xfs_btree_delete(cnt_cur, &i)))
goto error0;
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
/*

744
fs/xfs/xfs_alloc_btree.c
View File

@ -40,691 +40,6 @@
#include "xfs_alloc.h"
#include "xfs_error.h"
/*
* Prototypes for internal functions.
*/
STATIC void xfs_alloc_log_block(xfs_trans_t *, xfs_buf_t *, int);
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);
/*
* Internal functions.
*/
/*
* Single level of the xfs_alloc_delete record deletion routine.
* Delete record pointed to by cur/level.
* Remove the record from its block then rebalance the tree.
* Return 0 for error, 1 for done, 2 to go on to the next level.
*/
STATIC int /* error */
xfs_alloc_delrec(
xfs_btree_cur_t *cur, /* btree cursor */
int level, /* level removing record from */
int *stat) /* fail/done/go-on */
{
xfs_agf_t *agf; /* allocation group freelist header */
xfs_alloc_block_t *block; /* btree block record/key lives in */
xfs_agblock_t bno; /* btree block number */
xfs_buf_t *bp; /* buffer for block */
int error; /* error return value */
int i; /* loop index */
xfs_alloc_key_t key; /* kp points here if block is level 0 */
xfs_agblock_t lbno; /* left block's block number */
xfs_buf_t *lbp; /* left block's buffer pointer */
xfs_alloc_block_t *left; /* left btree block */
xfs_alloc_key_t *lkp=NULL; /* left block key pointer */
xfs_alloc_ptr_t *lpp=NULL; /* left block address pointer */
int lrecs=0; /* number of records in left block */
xfs_alloc_rec_t *lrp; /* left block record pointer */
xfs_mount_t *mp; /* mount structure */
int ptr; /* index in btree block for this rec */
xfs_agblock_t rbno; /* right block's block number */
xfs_buf_t *rbp; /* right block's buffer pointer */
xfs_alloc_block_t *right; /* right btree block */
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 */
/*
* Get the index of the entry being deleted, check for nothing there.
*/
ptr = cur->bc_ptrs[level];
if (ptr == 0) {
*stat = 0;
return 0;
}
/*
* Get the buffer & block containing the record or key/ptr.
*/
bp = cur->bc_bufs[level];
block = XFS_BUF_TO_ALLOC_BLOCK(bp);
#ifdef DEBUG
if ((error = xfs_btree_check_sblock(cur, block, level, bp)))
return error;
#endif
/*
* Fail if we're off the end of the block.
*/
numrecs = be16_to_cpu(block->bb_numrecs);
if (ptr > numrecs) {
*stat = 0;
return 0;
}
XFS_STATS_INC(xs_abt_delrec);
/*
* It's a nonleaf. Excise the key and ptr being deleted, by
* sliding the entries past them down one.
* Log the changed areas of the block.
*/
if (level > 0) {
lkp = XFS_ALLOC_KEY_ADDR(block, 1, cur);
lpp = XFS_ALLOC_PTR_ADDR(block, 1, cur);
#ifdef DEBUG
for (i = ptr; i < numrecs; i++) {
if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(lpp[i]), level)))
return error;
}
#endif
if (ptr < numrecs) {
memmove(&lkp[ptr - 1], &lkp[ptr],
(numrecs - ptr) * sizeof(*lkp));
memmove(&lpp[ptr - 1], &lpp[ptr],
(numrecs - ptr) * sizeof(*lpp));
xfs_alloc_log_ptrs(cur, bp, ptr, numrecs - 1);
xfs_alloc_log_keys(cur, bp, ptr, numrecs - 1);
}
}
/*
* It's a leaf. Excise the record being deleted, by sliding the
* entries past it down one. Log the changed areas of the block.
*/
else {
lrp = XFS_ALLOC_REC_ADDR(block, 1, cur);
if (ptr < numrecs) {
memmove(&lrp[ptr - 1], &lrp[ptr],
(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
* structure to pass up to the next level (updkey).
*/
if (ptr == 1) {
key.ar_startblock = lrp->ar_startblock;
key.ar_blockcount = lrp->ar_blockcount;
lkp = &key;
}
}
/*
* Decrement and log the number of entries in the block.
*/
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
* changed by this operation. True if it's the by-size btree, and
* this is the leaf level, and there is no right sibling block,
* and this was the last record.
*/
agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
mp = cur->bc_mp;
if (level == 0 &&
cur->bc_btnum == XFS_BTNUM_CNT &&
be32_to_cpu(block->bb_rightsib) == NULLAGBLOCK &&
ptr > numrecs) {
ASSERT(ptr == numrecs + 1);
/*
* There are still records in the block. Grab the size
* from the last one.
*/
if (numrecs) {
rrp = XFS_ALLOC_REC_ADDR(block, numrecs, cur);
agf->agf_longest = rrp->ar_blockcount;
}
/*
* No free extents left.
*/
else
agf->agf_longest = 0;
mp->m_perag[be32_to_cpu(agf->agf_seqno)].pagf_longest =
be32_to_cpu(agf->agf_longest);
xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp,
XFS_AGF_LONGEST);
}
/*
* Is this the root level? If so, we're almost done.
*/
if (level == cur->bc_nlevels - 1) {
/*
* If this is the root level,
* and there's only one entry left,
* and it's NOT the leaf level,
* then we can get rid of this level.
*/
if (numrecs == 1 && level > 0) {
/*
* 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_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.
*/
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
* coordination used in xfs_bmap_finish, we can't allow
* block to be available for reallocation and
* non-transaction writing (user data) until we know
* that the transaction that moved it to the free list
* is permanently on disk. We track the blocks by
* declaring these blocks as "busy"; the busy list is
* maintained on a per-ag basis and each transaction
* records which entries should be removed when the
* iclog commits to disk. If a busy block is
* allocated, the iclog is pushed up to the LSN
* that freed the block.
*/
xfs_alloc_mark_busy(cur->bc_tp,
be32_to_cpu(agf->agf_seqno), bno, 1);
xfs_trans_agbtree_delta(cur->bc_tp, -1);
xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp,
XFS_AGF_ROOTS | XFS_AGF_LEVELS);
/*
* Update the cursor so there's one fewer level.
*/
xfs_btree_setbuf(cur, level, NULL);
cur->bc_nlevels--;
} else if (level > 0 &&
(error = xfs_btree_decrement(cur, level, &i)))
return error;
*stat = 1;
return 0;
}
/*
* If we deleted the leftmost entry in the block, update the
* key values above us in the tree.
*/
if (ptr == 1 && (error = xfs_btree_updkey(cur, (union xfs_btree_key *)lkp, level + 1)))
return error;
/*
* If the number of records remaining in the block is at least
* the minimum, we're done.
*/
if (numrecs >= XFS_ALLOC_BLOCK_MINRECS(level, cur)) {
if (level > 0 && (error = xfs_btree_decrement(cur, level, &i)))
return error;
*stat = 1;
return 0;
}
/*
* Otherwise, we have to move some records around to keep the
* tree balanced. Look at the left and right sibling blocks to
* see if we can re-balance by moving only one record.
*/
rbno = be32_to_cpu(block->bb_rightsib);
lbno = be32_to_cpu(block->bb_leftsib);
bno = NULLAGBLOCK;
ASSERT(rbno != NULLAGBLOCK || lbno != NULLAGBLOCK);
/*
* Duplicate the cursor so our btree manipulations here won't
* disrupt the next level up.
*/
if ((error = xfs_btree_dup_cursor(cur, &tcur)))
return error;
/*
* If there's a right sibling, see if it's ok to shift an entry
* out of it.
*/
if (rbno != NULLAGBLOCK) {
/*
* Move the temp cursor to the last entry in the next block.
* Actually any entry but the first would suffice.
*/
i = xfs_btree_lastrec(tcur, level);
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
if ((error = xfs_btree_increment(tcur, level, &i)))
goto error0;
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
i = xfs_btree_lastrec(tcur, level);
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
/*
* Grab a pointer to the block.
*/
rbp = tcur->bc_bufs[level];
right = XFS_BUF_TO_ALLOC_BLOCK(rbp);
#ifdef DEBUG
if ((error = xfs_btree_check_sblock(cur, right, level, rbp)))
goto error0;
#endif
/*
* Grab the current block number, for future use.
*/
bno = be32_to_cpu(right->bb_leftsib);
/*
* If right block is full enough so that removing one entry
* won't make it too empty, and left-shifting an entry out
* of right to us works, we're done.
*/
if (be16_to_cpu(right->bb_numrecs) - 1 >=
XFS_ALLOC_BLOCK_MINRECS(level, cur)) {
if ((error = xfs_btree_lshift(tcur, level, &i)))
goto error0;
if (i) {
ASSERT(be16_to_cpu(block->bb_numrecs) >=
XFS_ALLOC_BLOCK_MINRECS(level, cur));
xfs_btree_del_cursor(tcur,
XFS_BTREE_NOERROR);
if (level > 0 &&
(error = xfs_btree_decrement(cur, level,
&i)))
return error;
*stat = 1;
return 0;
}
}
/*
* Otherwise, grab the number of records in right for
* future reference, and fix up the temp cursor to point
* to our block again (last record).
*/
rrecs = be16_to_cpu(right->bb_numrecs);
if (lbno != NULLAGBLOCK) {
i = xfs_btree_firstrec(tcur, level);
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
if ((error = xfs_btree_decrement(tcur, level, &i)))
goto error0;
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
}
}
/*
* If there's a left sibling, see if it's ok to shift an entry
* out of it.
*/
if (lbno != NULLAGBLOCK) {
/*
* Move the temp cursor to the first entry in the
* previous block.
*/
i = xfs_btree_firstrec(tcur, level);
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
if ((error = xfs_btree_decrement(tcur, level, &i)))
goto error0;
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
xfs_btree_firstrec(tcur, level);
/*
* Grab a pointer to the block.
*/
lbp = tcur->bc_bufs[level];
left = XFS_BUF_TO_ALLOC_BLOCK(lbp);
#ifdef DEBUG
if ((error = xfs_btree_check_sblock(cur, left, level, lbp)))
goto error0;
#endif
/*
* Grab the current block number, for future use.
*/
bno = be32_to_cpu(left->bb_rightsib);
/*
* If left block is full enough so that removing one entry
* won't make it too empty, and right-shifting an entry out
* of left to us works, we're done.
*/
if (be16_to_cpu(left->bb_numrecs) - 1 >=
XFS_ALLOC_BLOCK_MINRECS(level, cur)) {
if ((error = xfs_btree_rshift(tcur, level, &i)))
goto error0;
if (i) {
ASSERT(be16_to_cpu(block->bb_numrecs) >=
XFS_ALLOC_BLOCK_MINRECS(level, cur));
xfs_btree_del_cursor(tcur,
XFS_BTREE_NOERROR);
if (level == 0)
cur->bc_ptrs[0]++;
*stat = 1;
return 0;
}
}
/*
* Otherwise, grab the number of records in right for
* future reference.
*/
lrecs = be16_to_cpu(left->bb_numrecs);
}
/*
* Delete the temp cursor, we're done with it.
*/
xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
/*
* If here, we need to do a join to keep the tree balanced.
*/
ASSERT(bno != NULLAGBLOCK);
/*
* See if we can join with the left neighbor block.
*/
if (lbno != NULLAGBLOCK &&
lrecs + numrecs <= XFS_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 + 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;
}
/*
* Otherwise, we can't fix the imbalance.
* Just return. This is probably a logic error, but it's not fatal.
*/
else {
if (level > 0 && (error = xfs_btree_decrement(cur, level, &i)))
return error;
*stat = 1;
return 0;
}
/*
* We're now going to join "left" and "right" by moving all the stuff
* in "right" to "left" and deleting "right".
*/
if (level > 0) {
/*
* It's a non-leaf. Move keys and pointers.
*/
lkp = XFS_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 < rrecs; i++) {
if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(rpp[i]), level)))
return error;
}
#endif
memcpy(lkp, rkp, rrecs * sizeof(*lkp));
memcpy(lpp, rpp, rrecs * sizeof(*lpp));
xfs_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, lrecs + 1, cur);
rrp = XFS_ALLOC_REC_ADDR(right, 1, cur);
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
* cursor to the left block, and fix up the index.
*/
if (bp != lbp) {
xfs_btree_setbuf(cur, level, lbp);
cur->bc_ptrs[level] += lrecs;
}
/*
* If we joined with the right neighbor and there's a level above
* us, increment the cursor at that level.
*/
else if (level + 1 < cur->bc_nlevels &&
(error = xfs_btree_increment(cur, level + 1, &i)))
return error;
/*
* Fix up the number of records in the surviving block.
*/
lrecs += rrecs;
left->bb_numrecs = cpu_to_be16(lrecs);
/*
* Fix up the right block pointer in the surviving block, and log it.
*/
left->bb_rightsib = right->bb_rightsib;
xfs_alloc_log_block(cur->bc_tp, lbp, XFS_BB_NUMRECS | XFS_BB_RIGHTSIB);
/*
* If there is a right sibling now, make it point to the
* remaining block.
*/
if (be32_to_cpu(left->bb_rightsib) != NULLAGBLOCK) {
xfs_alloc_block_t *rrblock;
xfs_buf_t *rrbp;
if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
cur->bc_private.a.agno, be32_to_cpu(left->bb_rightsib), 0,
&rrbp, XFS_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(lbno);
xfs_alloc_log_block(cur->bc_tp, rrbp, XFS_BB_LEFTSIB);
}
/*
* Free the deleting block by putting it on the freelist.
*/
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
* used in xfs_bmap_finish, we can't allow block to be available
* for reallocation and non-transaction writing (user data)
* until we know that the transaction that moved it to the free
* list is permanently on disk. We track the blocks by declaring
* these blocks as "busy"; the busy list is maintained on a
* per-ag basis and each transaction records which entries
* should be removed when the iclog commits to disk. If a
* busy block is allocated, the iclog is pushed up to the
* LSN that freed the block.
*/
xfs_alloc_mark_busy(cur->bc_tp, be32_to_cpu(agf->agf_seqno), bno, 1);
xfs_trans_agbtree_delta(cur->bc_tp, -1);
/*
* Adjust the current level's cursor so that we're left referring
* to the right node, after we're done.
* If this leaves the ptr value 0 our caller will fix it up.
*/
if (level > 0)
cur->bc_ptrs[level]--;
/*
* Return value means the next level up has something to do.
*/
*stat = 2;
return 0;
error0:
xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR);
return error;
}
/*
* Log header fields from a btree block.
*/
STATIC void
xfs_alloc_log_block(
xfs_trans_t *tp, /* transaction pointer */
xfs_buf_t *bp, /* buffer containing btree block */
int fields) /* mask of fields: XFS_BB_... */
{
int first; /* first byte offset logged */
int last; /* last byte offset logged */
static const short offsets[] = { /* table of offsets */
offsetof(xfs_alloc_block_t, bb_magic),
offsetof(xfs_alloc_block_t, bb_level),
offsetof(xfs_alloc_block_t, bb_numrecs),
offsetof(xfs_alloc_block_t, bb_leftsib),
offsetof(xfs_alloc_block_t, bb_rightsib),
sizeof(xfs_alloc_block_t)
};
xfs_btree_offsets(fields, offsets, XFS_BB_NUM_BITS, &first, &last);
xfs_trans_log_buf(tp, bp, first, last);
}
/*
* Log keys from a btree block (nonleaf).
*/
STATIC void
xfs_alloc_log_keys(
xfs_btree_cur_t *cur, /* btree cursor */
xfs_buf_t *bp, /* buffer containing btree block */
int kfirst, /* index of first key to log */
int klast) /* index of last key to log */
{
xfs_alloc_block_t *block; /* btree block to log from */
int first; /* first byte offset logged */
xfs_alloc_key_t *kp; /* key pointer in btree block */
int last; /* last byte offset logged */
block = XFS_BUF_TO_ALLOC_BLOCK(bp);
kp = XFS_ALLOC_KEY_ADDR(block, 1, cur);
first = (int)((xfs_caddr_t)&kp[kfirst - 1] - (xfs_caddr_t)block);
last = (int)(((xfs_caddr_t)&kp[klast] - 1) - (xfs_caddr_t)block);
xfs_trans_log_buf(cur->bc_tp, bp, first, last);
}
/*
* Log block pointer fields from a btree block (nonleaf).
*/
STATIC void
xfs_alloc_log_ptrs(
xfs_btree_cur_t *cur, /* btree cursor */
xfs_buf_t *bp, /* buffer containing btree block */
int pfirst, /* index of first pointer to log */
int plast) /* index of last pointer to log */
{
xfs_alloc_block_t *block; /* btree block to log from */
int first; /* first byte offset logged */
int last; /* last byte offset logged */
xfs_alloc_ptr_t *pp; /* block-pointer pointer in btree blk */
block = XFS_BUF_TO_ALLOC_BLOCK(bp);
pp = XFS_ALLOC_PTR_ADDR(block, 1, cur);
first = (int)((xfs_caddr_t)&pp[pfirst - 1] - (xfs_caddr_t)block);
last = (int)(((xfs_caddr_t)&pp[plast] - 1) - (xfs_caddr_t)block);
xfs_trans_log_buf(cur->bc_tp, bp, first, last);
}
/*
* Log records from a btree block (leaf).
*/
STATIC void
xfs_alloc_log_recs(
xfs_btree_cur_t *cur, /* btree cursor */
xfs_buf_t *bp, /* buffer containing btree block */
int rfirst, /* index of first record to log */
int rlast) /* index of last record to log */
{
xfs_alloc_block_t *block; /* btree block to log from */
int first; /* first byte offset logged */
int last; /* last byte offset logged */
xfs_alloc_rec_t *rp; /* record pointer for btree block */
block = XFS_BUF_TO_ALLOC_BLOCK(bp);
rp = XFS_ALLOC_REC_ADDR(block, 1, cur);
#ifdef DEBUG
{
xfs_agf_t *agf;
xfs_alloc_rec_t *p;
agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
for (p = &rp[rfirst - 1]; p <= &rp[rlast - 1]; p++)
ASSERT(be32_to_cpu(p->ar_startblock) +
be32_to_cpu(p->ar_blockcount) <=
be32_to_cpu(agf->agf_length));
}
#endif
first = (int)((xfs_caddr_t)&rp[rfirst - 1] - (xfs_caddr_t)block);
last = (int)(((xfs_caddr_t)&rp[rlast] - 1) - (xfs_caddr_t)block);
xfs_trans_log_buf(cur->bc_tp, bp, first, last);
}
/*
* Externally visible routines.
*/
/*
* Delete the record pointed to by cur.
* The cursor refers to the place where the record was (could be inserted)
* when the operation returns.
*/
int /* error */
xfs_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_btree_decrement(cur, level, &i)))
return error;
break;
}
}
}
*stat = i;
return 0;
}
/*
* Get the data from the pointed-to record.
@ -879,6 +194,7 @@ xfs_allocbt_update_lastrec(
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;
int numrecs;
ASSERT(cur->bc_btnum == XFS_BTNUM_CNT);
@ -897,6 +213,22 @@ xfs_allocbt_update_lastrec(
be32_to_cpu(agf->agf_longest))
return;
len = rec->alloc.ar_blockcount;
break;
case LASTREC_DELREC:
numrecs = xfs_btree_get_numrecs(block);
if (ptr <= numrecs)
return;
ASSERT(ptr == numrecs + 1);
if (numrecs) {
xfs_alloc_rec_t *rrp;
rrp = XFS_ALLOC_REC_ADDR(block, numrecs, cur);
len = rrp->ar_blockcount;
} else {
len = 0;
}
break;
default:
ASSERT(0);
@ -908,6 +240,14 @@ xfs_allocbt_update_lastrec(
xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp, XFS_AGF_LONGEST);
}
STATIC int
xfs_allocbt_get_minrecs(
struct xfs_btree_cur *cur,
int level)
{
return cur->bc_mp->m_alloc_mnr[level != 0];
}
STATIC int
xfs_allocbt_get_maxrecs(
struct xfs_btree_cur *cur,
@ -983,6 +323,38 @@ xfs_allocbt_key_diff(
return (__int64_t)be32_to_cpu(kp->ar_startblock) - rec->ar_startblock;
}
STATIC int
xfs_allocbt_kill_root(
struct xfs_btree_cur *cur,
struct xfs_buf *bp,
int level,
union xfs_btree_ptr *newroot)
{
int error;
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
XFS_BTREE_STATS_INC(cur, killroot);
/*
* Update the root pointer, decreasing the level by 1 and then
* free the old root.
*/
xfs_allocbt_set_root(cur, newroot, -1);
error = xfs_allocbt_free_block(cur, bp);
if (error) {
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
return error;
}
XFS_BTREE_STATS_INC(cur, free);
xfs_btree_setbuf(cur, level, NULL);
cur->bc_nlevels--;
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
return 0;
}
#ifdef XFS_BTREE_TRACE
ktrace_t *xfs_allocbt_trace_buf;
@ -1055,9 +427,11 @@ static const struct xfs_btree_ops xfs_allocbt_ops = {
.dup_cursor = xfs_allocbt_dup_cursor,
.set_root = xfs_allocbt_set_root,
.kill_root = xfs_allocbt_kill_root,
.alloc_block = xfs_allocbt_alloc_block,
.free_block = xfs_allocbt_free_block,
.update_lastrec = xfs_allocbt_update_lastrec,
.get_minrecs = xfs_allocbt_get_minrecs,
.get_maxrecs = xfs_allocbt_get_maxrecs,
.init_key_from_rec = xfs_allocbt_init_key_from_rec,
.init_rec_from_key = xfs_allocbt_init_rec_from_key,

7
fs/xfs/xfs_alloc_btree.h
View File

@ -94,13 +94,6 @@ typedef struct xfs_btree_sblock xfs_alloc_block_t;
#define XFS_ALLOC_PTR_ADDR(bb,i,cur) \
XFS_BTREE_PTR_ADDR(xfs_alloc, bb, i, XFS_ALLOC_BLOCK_MAXRECS(1, cur))
/*
* Delete the record pointed to by cur.
* The cursor refers to the place where the record was (could be inserted)
* when the operation returns.
*/
extern int xfs_alloc_delete(struct xfs_btree_cur *cur, int *stat);
/*
* Get the data from the pointed-to record.
*/

14
fs/xfs/xfs_bmap.c
View File

@ -864,7 +864,7 @@ xfs_bmap_add_extent_delay_real(
RIGHT.br_blockcount, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_bmbt_delete(cur, &i)))
if ((error = xfs_btree_delete(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_btree_decrement(cur, 0, &i)))
@ -1425,13 +1425,13 @@ xfs_bmap_add_extent_unwritten_real(
RIGHT.br_blockcount, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_bmbt_delete(cur, &i)))
if ((error = xfs_btree_delete(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_btree_decrement(cur, 0, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_bmbt_delete(cur, &i)))
if ((error = xfs_btree_delete(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_btree_decrement(cur, 0, &i)))
@ -1474,7 +1474,7 @@ xfs_bmap_add_extent_unwritten_real(
&i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_bmbt_delete(cur, &i)))
if ((error = xfs_btree_delete(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_btree_decrement(cur, 0, &i)))
@ -1517,7 +1517,7 @@ xfs_bmap_add_extent_unwritten_real(
RIGHT.br_blockcount, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_bmbt_delete(cur, &i)))
if ((error = xfs_btree_delete(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_btree_decrement(cur, 0, &i)))
@ -2152,7 +2152,7 @@ xfs_bmap_add_extent_hole_real(
right.br_blockcount, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_bmbt_delete(cur, &i)))
if ((error = xfs_btree_delete(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_btree_decrement(cur, 0, &i)))
@ -3216,7 +3216,7 @@ xfs_bmap_del_extent(
flags |= XFS_ILOG_FEXT(whichfork);
break;
}
if ((error = xfs_bmbt_delete(cur, &i)))
if ((error = xfs_btree_delete(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
break;

525
fs/xfs/xfs_bmap_btree.c
View File

@ -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,

3
fs/xfs/xfs_bmap_btree.h
View File

@ -237,10 +237,7 @@ typedef struct xfs_btree_lblock xfs_bmbt_block_t;
* Prototypes for xfs_bmap.c to call.
*/
extern void xfs_bmdr_to_bmbt(xfs_bmdr_block_t *, int, xfs_bmbt_block_t *, int);
extern int xfs_bmbt_delete(struct xfs_btree_cur *, int *);
extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
extern xfs_bmbt_block_t *xfs_bmbt_get_block(struct xfs_btree_cur *cur,
int, struct xfs_buf **bpp);
extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_host_t *r);
extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_host_t *r);
extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_host_t *r);

593
fs/xfs/xfs_btree.c
View File

@ -3171,3 +3171,596 @@ xfs_btree_kill_iroot(
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
return 0;
}
STATIC int
xfs_btree_dec_cursor(
struct xfs_btree_cur *cur,
int level,
int *stat)
{
int error;
int i;
if (level > 0) {
error = xfs_btree_decrement(cur, level, &i);
if (error)
return error;
}
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
*stat = 1;
return 0;
}
/*
* Single level of the btree record deletion routine.
* Delete record pointed to by cur/level.
* Remove the record from its block then rebalance the tree.
* Return 0 for error, 1 for done, 2 to go on to the next level.
*/
STATIC int /* error */
xfs_btree_delrec(
struct xfs_btree_cur *cur, /* btree cursor */
int level, /* level removing record from */
int *stat) /* fail/done/go-on */
{
struct xfs_btree_block *block; /* btree block */
union xfs_btree_ptr cptr; /* current block ptr */
struct xfs_buf *bp; /* buffer for block */
int error; /* error return value */
int i; /* loop counter */
union xfs_btree_key key; /* storage for keyp */
union xfs_btree_key *keyp = &key; /* passed to the next level */
union xfs_btree_ptr lptr; /* left sibling block ptr */
struct xfs_buf *lbp; /* left buffer pointer */
struct xfs_btree_block *left; /* left btree block */
int lrecs = 0; /* left record count */
int ptr; /* key/record index */
union xfs_btree_ptr rptr; /* right sibling block ptr */
struct xfs_buf *rbp; /* right buffer pointer */
struct xfs_btree_block *right; /* right btree block */
struct xfs_btree_block *rrblock; /* right-right btree block */
struct xfs_buf *rrbp; /* right-right buffer pointer */
int rrecs = 0; /* right record count */
struct xfs_btree_cur *tcur; /* temporary btree cursor */
int numrecs; /* temporary numrec count */
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
XFS_BTREE_TRACE_ARGI(cur, level);
tcur = NULL;
/* Get the index of the entry being deleted, check for nothing there. */
ptr = cur->bc_ptrs[level];
if (ptr == 0) {
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
*stat = 0;
return 0;
}
/* Get the buffer & block containing the record or key/ptr. */
block = xfs_btree_get_block(cur, level, &bp);
numrecs = xfs_btree_get_numrecs(block);
#ifdef DEBUG
error = xfs_btree_check_block(cur, block, level, bp);
if (error)
goto error0;
#endif
/* Fail if we're off the end of the block. */
if (ptr > numrecs) {
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
*stat = 0;
return 0;
}
XFS_BTREE_STATS_INC(cur, delrec);
XFS_BTREE_STATS_ADD(cur, moves, numrecs - ptr);
/* Excise the entries being deleted. */
if (level > 0) {
/* It's a nonleaf. operate on keys and ptrs */
union xfs_btree_key *lkp;
union xfs_btree_ptr *lpp;
lkp = xfs_btree_key_addr(cur, ptr + 1, block);
lpp = xfs_btree_ptr_addr(cur, ptr + 1, block);
#ifdef DEBUG
for (i = 0; i < numrecs - ptr; i++) {
error = xfs_btree_check_ptr(cur, lpp, i, level);
if (error)
goto error0;
}
#endif
if (ptr < numrecs) {
xfs_btree_shift_keys(cur, lkp, -1, numrecs - ptr);
xfs_btree_shift_ptrs(cur, lpp, -1, numrecs - ptr);
xfs_btree_log_keys(cur, bp, ptr, numrecs - 1);
xfs_btree_log_ptrs(cur, bp, ptr, numrecs - 1);
}
/*
* If it's the first record in the block, we'll need to pass a
* key up to the next level (updkey).
*/
if (ptr == 1)
keyp = xfs_btree_key_addr(cur, 1, block);
} else {
/* It's a leaf. operate on records */
if (ptr < numrecs) {
xfs_btree_shift_recs(cur,
xfs_btree_rec_addr(cur, ptr + 1, block),
-1, numrecs - ptr);
xfs_btree_log_recs(cur, bp, ptr, numrecs - 1);
}
/*
* If it's the first record in the block, we'll need a key
* structure to pass up to the next level (updkey).
*/
if (ptr == 1) {
cur->bc_ops->init_key_from_rec(&key,
xfs_btree_rec_addr(cur, 1, block));
keyp = &key;
}
}
/*
* Decrement and log the number of entries in the block.
*/
xfs_btree_set_numrecs(block, --numrecs);
xfs_btree_log_block(cur, bp, XFS_BB_NUMRECS);
/*
* If we are tracking the last record in the tree and
* we are at the far right edge of the tree, update it.
*/
if (xfs_btree_is_lastrec(cur, block, level)) {
cur->bc_ops->update_lastrec(cur, block, NULL,
ptr, LASTREC_DELREC);
}
/*
* 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) {
if (cur->bc_flags & XFS_BTREE_ROOT_IN_INODE) {
xfs_iroot_realloc(cur->bc_private.b.ip, -1,
cur->bc_private.b.whichfork);
error = xfs_btree_kill_iroot(cur);
if (error)
goto error0;
error = xfs_btree_dec_cursor(cur, level, stat);
if (error)
goto error0;
*stat = 1;
return 0;
}
/*
* If this is the root level, and there's only one entry left,
* and it's NOT the leaf level, then we can get rid of this
* level.
*/
if (numrecs == 1 && level > 0) {
union xfs_btree_ptr *pp;
/*
* pp is still set to the first pointer in the block.
* Make it the new root of the btree.
*/
pp = xfs_btree_ptr_addr(cur, 1, block);
error = cur->bc_ops->kill_root(cur, bp, level, pp);
if (error)
goto error0;
} else if (level > 0) {
error = xfs_btree_dec_cursor(cur, level, stat);
if (error)
goto error0;
}
*stat = 1;
return 0;
}
/*
* If we deleted the leftmost entry in the block, update the
* key values above us in the tree.
*/
if (ptr == 1) {
error = xfs_btree_updkey(cur, keyp, level + 1);
if (error)
goto error0;
}
/*
* If the number of records remaining in the block is at least
* the minimum, we're done.
*/
if (numrecs >= cur->bc_ops->get_minrecs(cur, level)) {
error = xfs_btree_dec_cursor(cur, level, stat);
if (error)
goto error0;
return 0;
}
/*
* Otherwise, we have to move some records around to keep the
* tree balanced. Look at the left and right sibling blocks to
* see if we can re-balance by moving only one record.
*/
xfs_btree_get_sibling(cur, block, &rptr, XFS_BB_RIGHTSIB);
xfs_btree_get_sibling(cur, block, &lptr, XFS_BB_LEFTSIB);
if (cur->bc_flags & XFS_BTREE_ROOT_IN_INODE) {
/*
* 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 (xfs_btree_ptr_is_null(cur, &rptr) &&
xfs_btree_ptr_is_null(cur, &lptr) &&
level == cur->bc_nlevels - 2) {
error = xfs_btree_kill_iroot(cur);
if (!error)
error = xfs_btree_dec_cursor(cur, level, stat);
if (error)
goto error0;
return 0;
}
}
ASSERT(!xfs_btree_ptr_is_null(cur, &rptr) ||
!xfs_btree_ptr_is_null(cur, &lptr));
/*
* Duplicate the cursor so our btree manipulations here won't
* disrupt the next level up.
*/
error = xfs_btree_dup_cursor(cur, &tcur);
if (error)
goto error0;
/*
* If there's a right sibling, see if it's ok to shift an entry
* out of it.
*/
if (!xfs_btree_ptr_is_null(cur, &rptr)) {
/*
* Move the temp cursor to the last entry in the next block.
* Actually any entry but the first would suffice.
*/
i = xfs_btree_lastrec(tcur, level);
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
error = xfs_btree_increment(tcur, level, &i);
if (error)
goto error0;
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
i = xfs_btree_lastrec(tcur, level);
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
/* Grab a pointer to the block. */
right = xfs_btree_get_block(tcur, level, &rbp);
#ifdef DEBUG
error = xfs_btree_check_block(tcur, right, level, rbp);
if (error)
goto error0;
#endif
/* Grab the current block number, for future use. */
xfs_btree_get_sibling(tcur, right, &cptr, XFS_BB_LEFTSIB);
/*
* If right block is full enough so that removing one entry
* won't make it too empty, and left-shifting an entry out
* of right to us works, we're done.
*/
if (xfs_btree_get_numrecs(right) - 1 >=
cur->bc_ops->get_minrecs(tcur, level)) {
error = xfs_btree_lshift(tcur, level, &i);
if (error)
goto error0;
if (i) {
ASSERT(xfs_btree_get_numrecs(block) >=
cur->bc_ops->get_minrecs(tcur, level));
xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
tcur = NULL;
error = xfs_btree_dec_cursor(cur, level, stat);
if (error)
goto error0;
return 0;
}
}
/*
* Otherwise, grab the number of records in right for
* future reference, and fix up the temp cursor to point
* to our block again (last record).
*/
rrecs = xfs_btree_get_numrecs(right);
if (!xfs_btree_ptr_is_null(cur, &lptr)) {
i = xfs_btree_firstrec(tcur, level);
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
error = xfs_btree_decrement(tcur, level, &i);
if (error)
goto error0;
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
}
}
/*
* If there's a left sibling, see if it's ok to shift an entry
* out of it.
*/
if (!xfs_btree_ptr_is_null(cur, &lptr)) {
/*
* Move the temp cursor to the first entry in the
* previous block.
*/
i = xfs_btree_firstrec(tcur, level);
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
error = xfs_btree_decrement(tcur, level, &i);
if (error)
goto error0;
i = xfs_btree_firstrec(tcur, level);
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
/* Grab a pointer to the block. */
left = xfs_btree_get_block(tcur, level, &lbp);
#ifdef DEBUG
error = xfs_btree_check_block(cur, left, level, lbp);
if (error)
goto error0;
#endif
/* Grab the current block number, for future use. */
xfs_btree_get_sibling(tcur, left, &cptr, XFS_BB_RIGHTSIB);
/*
* If left block is full enough so that removing one entry
* won't make it too empty, and right-shifting an entry out
* of left to us works, we're done.
*/
if (xfs_btree_get_numrecs(left) - 1 >=
cur->bc_ops->get_minrecs(tcur, level)) {
error = xfs_btree_rshift(tcur, level, &i);
if (error)
goto error0;
if (i) {
ASSERT(xfs_btree_get_numrecs(block) >=
cur->bc_ops->get_minrecs(tcur, level));
xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
tcur = NULL;
if (level == 0)
cur->bc_ptrs[0]++;
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
*stat = 1;
return 0;
}
}
/*
* Otherwise, grab the number of records in right for
* future reference.
*/
lrecs = xfs_btree_get_numrecs(left);
}
/* Delete the temp cursor, we're done with it. */
xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
tcur = NULL;
/* If here, we need to do a join to keep the tree balanced. */
ASSERT(!xfs_btree_ptr_is_null(cur, &cptr));
if (!xfs_btree_ptr_is_null(cur, &lptr) &&
lrecs + xfs_btree_get_numrecs(block) <=
cur->bc_ops->get_maxrecs(cur, level)) {
/*
* Set "right" to be the starting block,
* "left" to be the left neighbor.
*/
rptr = cptr;
right = block;
rbp = bp;
error = xfs_btree_read_buf_block(cur, &lptr, level,
0, &left, &lbp);
if (error)
goto error0;
/*
* If that won't work, see if we can join with the right neighbor block.
*/
} else if (!xfs_btree_ptr_is_null(cur, &rptr) &&
rrecs + xfs_btree_get_numrecs(block) <=
cur->bc_ops->get_maxrecs(cur, level)) {
/*
* Set "left" to be the starting block,
* "right" to be the right neighbor.
*/
lptr = cptr;
left = block;
lbp = bp;
error = xfs_btree_read_buf_block(cur, &rptr, level,
0, &right, &rbp);
if (error)
goto error0;
/*
* Otherwise, we can't fix the imbalance.
* Just return. This is probably a logic error, but it's not fatal.
*/
} else {
error = xfs_btree_dec_cursor(cur, level, stat);
if (error)
goto error0;
return 0;
}
rrecs = xfs_btree_get_numrecs(right);
lrecs = xfs_btree_get_numrecs(left);
/*
* We're now going to join "left" and "right" by moving all the stuff
* in "right" to "left" and deleting "right".
*/
XFS_BTREE_STATS_ADD(cur, moves, rrecs);
if (level > 0) {
/* It's a non-leaf. Move keys and pointers. */
union xfs_btree_key *lkp; /* left btree key */
union xfs_btree_ptr *lpp; /* left address pointer */
union xfs_btree_key *rkp; /* right btree key */
union xfs_btree_ptr *rpp; /* right address pointer */
lkp = xfs_btree_key_addr(cur, lrecs + 1, left);
lpp = xfs_btree_ptr_addr(cur, lrecs + 1, left);
rkp = xfs_btree_key_addr(cur, 1, right);
rpp = xfs_btree_ptr_addr(cur, 1, right);
#ifdef DEBUG
for (i = 1; i < rrecs; i++) {
error = xfs_btree_check_ptr(cur, rpp, i, level);
if (error)
goto error0;
}
#endif
xfs_btree_copy_keys(cur, lkp, rkp, rrecs);
xfs_btree_copy_ptrs(cur, lpp, rpp, rrecs);
xfs_btree_log_keys(cur, lbp, lrecs + 1, lrecs + rrecs);
xfs_btree_log_ptrs(cur, lbp, lrecs + 1, lrecs + rrecs);
} else {
/* It's a leaf. Move records. */
union xfs_btree_rec *lrp; /* left record pointer */
union xfs_btree_rec *rrp; /* right record pointer */
lrp = xfs_btree_rec_addr(cur, lrecs + 1, left);
rrp = xfs_btree_rec_addr(cur, 1, right);
xfs_btree_copy_recs(cur, lrp, rrp, rrecs);
xfs_btree_log_recs(cur, lbp, lrecs + 1, lrecs + rrecs);
}
XFS_BTREE_STATS_INC(cur, join);
/*
* Fix up the the number of records and right block pointer in the
* surviving block, and log it.
*/
xfs_btree_set_numrecs(left, lrecs + rrecs);
xfs_btree_get_sibling(cur, right, &cptr, XFS_BB_RIGHTSIB),
xfs_btree_set_sibling(cur, left, &cptr, XFS_BB_RIGHTSIB);
xfs_btree_log_block(cur, lbp, XFS_BB_NUMRECS | XFS_BB_RIGHTSIB);
/* If there is a right sibling, point it to the remaining block. */
xfs_btree_get_sibling(cur, left, &cptr, XFS_BB_RIGHTSIB);
if (!xfs_btree_ptr_is_null(cur, &cptr)) {
error = xfs_btree_read_buf_block(cur, &cptr, level,
0, &rrblock, &rrbp);
if (error)
goto error0;
xfs_btree_set_sibling(cur, rrblock, &lptr, XFS_BB_LEFTSIB);
xfs_btree_log_block(cur, rrbp, XFS_BB_LEFTSIB);
}
/* Free the deleted block. */
error = cur->bc_ops->free_block(cur, rbp);
if (error)
goto error0;
XFS_BTREE_STATS_INC(cur, free);
/*
* If we joined with the left neighbor, set the buffer in the
* cursor to the left block, and fix up the index.
*/
if (bp != lbp) {
cur->bc_bufs[level] = lbp;
cur->bc_ptrs[level] += lrecs;
cur->bc_ra[level] = 0;
}
/*
* If we joined with the right neighbor and there's a level above
* us, increment the cursor at that level.
*/
else if ((cur->bc_flags & XFS_BTREE_ROOT_IN_INODE) ||
(level + 1 < cur->bc_nlevels)) {
error = xfs_btree_increment(cur, level + 1, &i);
if (error)
goto error0;
}
/*
* Readjust the ptr at this level if it's not a leaf, since it's
* still pointing at the deletion point, which makes the cursor
* inconsistent. If this makes the ptr 0, the caller fixes it up.
* We can't use decrement because it would change the next level up.
*/
if (level > 0)
cur->bc_ptrs[level]--;
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
/* Return value means the next level up has something to do. */
*stat = 2;
return 0;
error0:
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
if (tcur)
xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR);
return error;
}
/*
* 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_btree_delete(
struct xfs_btree_cur *cur,
int *stat) /* success/failure */
{
int error; /* error return value */
int level;
int i;
XFS_BTREE_TRACE_CURSOR(cur, XBT_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.
*/
for (level = 0, i = 2; i == 2; level++) {
error = xfs_btree_delrec(cur, level, &i);
if (error)
goto error0;
}
if (i == 0) {
for (level = 1; level < cur->bc_nlevels; level++) {
if (cur->bc_ptrs[level] == 0) {
error = xfs_btree_decrement(cur, level, &i);
if (error)
goto error0;
break;
}
}
}
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
*stat = i;
return 0;
error0:
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
return error;
}

5
fs/xfs/xfs_btree.h
View File

@ -192,6 +192,8 @@ struct xfs_btree_ops {
/* update btree root pointer */
void (*set_root)(struct xfs_btree_cur *cur,
union xfs_btree_ptr *nptr, int level_change);
int (*kill_root)(struct xfs_btree_cur *cur, struct xfs_buf *bp,
int level, union xfs_btree_ptr *newroot);
/* block allocation / freeing */
int (*alloc_block)(struct xfs_btree_cur *cur,
@ -207,6 +209,7 @@ struct xfs_btree_ops {
int ptr, int reason);
/* records in block/level */
int (*get_minrecs)(struct xfs_btree_cur *cur, int level);
int (*get_maxrecs)(struct xfs_btree_cur *cur, int level);
/* records on disk. Matter for the root in inode case. */
@ -251,6 +254,7 @@ struct xfs_btree_ops {
*/
#define LASTREC_UPDATE 0
#define LASTREC_INSREC 1
#define LASTREC_DELREC 2
/*
@ -562,6 +566,7 @@ int xfs_btree_new_root(struct xfs_btree_cur *, int *);
int xfs_btree_new_iroot(struct xfs_btree_cur *, int *, int *);
int xfs_btree_kill_iroot(struct xfs_btree_cur *);
int xfs_btree_insert(struct xfs_btree_cur *, int *);
int xfs_btree_delete(struct xfs_btree_cur *, int *);
/*
* Helpers.

4
fs/xfs/xfs_ialloc.c
View File

@ -1168,8 +1168,8 @@ xfs_difree(
xfs_trans_mod_sb(tp, XFS_TRANS_SB_ICOUNT, -ilen);
xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, -(ilen - 1));
if ((error = xfs_inobt_delete(cur, &i))) {
cmn_err(CE_WARN, "xfs_difree: xfs_inobt_delete returned an error %d on %s.\n",
if ((error = xfs_btree_delete(cur, &i))) {
cmn_err(CE_WARN, "xfs_difree: xfs_btree_delete returned an error %d on %s.\n",
error, mp->m_fsname);
goto error0;
}

646
fs/xfs/xfs_ialloc_btree.c
View File

@ -40,611 +40,6 @@
#include "xfs_alloc.h"
#include "xfs_error.h"
STATIC void xfs_inobt_log_block(xfs_trans_t *, xfs_buf_t *, int);
STATIC void xfs_inobt_log_keys(xfs_btree_cur_t *, xfs_buf_t *, int, int);
STATIC void xfs_inobt_log_ptrs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
STATIC void xfs_inobt_log_recs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
/*
* Single level of the xfs_inobt_delete record deletion routine.
* Delete record pointed to by cur/level.
* Remove the record from its block then rebalance the tree.
* Return 0 for error, 1 for done, 2 to go on to the next level.
*/
STATIC int /* error */
xfs_inobt_delrec(
xfs_btree_cur_t *cur, /* btree cursor */
int level, /* level removing record from */
int *stat) /* fail/done/go-on */
{
xfs_buf_t *agbp; /* buffer for a.g. inode header */
xfs_mount_t *mp; /* mount structure */
xfs_agi_t *agi; /* allocation group inode header */
xfs_inobt_block_t *block; /* btree block record/key lives in */
xfs_agblock_t bno; /* btree block number */
xfs_buf_t *bp; /* buffer for block */
int error; /* error return value */
int i; /* loop index */
xfs_inobt_key_t key; /* kp points here if block is level 0 */
xfs_inobt_key_t *kp = NULL; /* pointer to btree keys */
xfs_agblock_t lbno; /* left block's block number */
xfs_buf_t *lbp; /* left block's buffer pointer */
xfs_inobt_block_t *left; /* left btree block */
xfs_inobt_key_t *lkp; /* left block key pointer */
xfs_inobt_ptr_t *lpp; /* left block address pointer */
int lrecs = 0; /* number of records in left block */
xfs_inobt_rec_t *lrp; /* left block record pointer */
xfs_inobt_ptr_t *pp = NULL; /* pointer to btree addresses */
int ptr; /* index in btree block for this rec */
xfs_agblock_t rbno; /* right block's block number */
xfs_buf_t *rbp; /* right block's buffer pointer */
xfs_inobt_block_t *right; /* right btree block */
xfs_inobt_key_t *rkp; /* right block key pointer */
xfs_inobt_rec_t *rp; /* pointer to btree records */
xfs_inobt_ptr_t *rpp; /* right block address pointer */
int rrecs = 0; /* number of records in right block */
int numrecs;
xfs_inobt_rec_t *rrp; /* right block record pointer */
xfs_btree_cur_t *tcur; /* temporary btree cursor */
mp = cur->bc_mp;
/*
* Get the index of the entry being deleted, check for nothing there.
*/
ptr = cur->bc_ptrs[level];
if (ptr == 0) {
*stat = 0;
return 0;
}
/*
* Get the buffer & block containing the record or key/ptr.
*/
bp = cur->bc_bufs[level];
block = XFS_BUF_TO_INOBT_BLOCK(bp);
#ifdef DEBUG
if ((error = xfs_btree_check_sblock(cur, block, level, bp)))
return error;
#endif
/*
* Fail if we're off the end of the block.
*/
numrecs = be16_to_cpu(block->bb_numrecs);
if (ptr > numrecs) {
*stat = 0;
return 0;
}
/*
* It's a nonleaf. Excise the key and ptr being deleted, by
* sliding the entries past them down one.
* Log the changed areas of the block.
*/
if (level > 0) {
kp = XFS_INOBT_KEY_ADDR(block, 1, cur);
pp = XFS_INOBT_PTR_ADDR(block, 1, cur);
#ifdef DEBUG
for (i = ptr; i < numrecs; i++) {
if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(pp[i]), level)))
return error;
}
#endif
if (ptr < numrecs) {
memmove(&kp[ptr - 1], &kp[ptr],
(numrecs - ptr) * sizeof(*kp));
memmove(&pp[ptr - 1], &pp[ptr],
(numrecs - ptr) * sizeof(*kp));
xfs_inobt_log_keys(cur, bp, ptr, numrecs - 1);
xfs_inobt_log_ptrs(cur, bp, ptr, numrecs - 1);
}
}
/*
* It's a leaf. Excise the record being deleted, by sliding the
* entries past it down one. Log the changed areas of the block.
*/
else {
rp = XFS_INOBT_REC_ADDR(block, 1, cur);
if (ptr < numrecs) {
memmove(&rp[ptr - 1], &rp[ptr],
(numrecs - ptr) * sizeof(*rp));
xfs_inobt_log_recs(cur, bp, ptr, numrecs - 1);
}
/*
* If it's the first record in the block, we'll need a key
* structure to pass up to the next level (updkey).
*/
if (ptr == 1) {
key.ir_startino = rp->ir_startino;
kp = &key;
}
}
/*
* Decrement and log the number of entries in the block.
*/
numrecs--;
block->bb_numrecs = cpu_to_be16(numrecs);
xfs_inobt_log_block(cur->bc_tp, bp, XFS_BB_NUMRECS);
/*
* Is this the root level? If so, we're almost done.
*/
if (level == cur->bc_nlevels - 1) {
/*
* If this is the root level,
* and there's only one entry left,
* and it's NOT the leaf level,
* then we can get rid of this level.
*/
if (numrecs == 1 && level > 0) {
agbp = cur->bc_private.a.agbp;
agi = XFS_BUF_TO_AGI(agbp);
/*
* pp is still set to the first pointer in the block.
* Make it the new root of the btree.
*/
bno = be32_to_cpu(agi->agi_root);
agi->agi_root = *pp;
be32_add_cpu(&agi->agi_level, -1);
/*
* Free the block.
*/
if ((error = xfs_free_extent(cur->bc_tp,
XFS_AGB_TO_FSB(mp, cur->bc_private.a.agno, bno), 1)))
return error;
xfs_trans_binval(cur->bc_tp, bp);
xfs_ialloc_log_agi(cur->bc_tp, agbp,
XFS_AGI_ROOT | XFS_AGI_LEVEL);
/*
* Update the cursor so there's one fewer level.
*/
cur->bc_bufs[level] = NULL;
cur->bc_nlevels--;
} else if (level > 0 &&
(error = xfs_btree_decrement(cur, level, &i)))
return error;
*stat = 1;
return 0;
}
/*
* If we deleted the leftmost entry in the block, update the
* key values above us in the tree.
*/
if (ptr == 1 && (error = xfs_btree_updkey(cur, (union xfs_btree_key *)kp, level + 1)))
return error;
/*
* If the number of records remaining in the block is at least
* the minimum, we're done.
*/
if (numrecs >= XFS_INOBT_BLOCK_MINRECS(level, cur)) {
if (level > 0 &&
(error = xfs_btree_decrement(cur, level, &i)))
return error;
*stat = 1;
return 0;
}
/*
* Otherwise, we have to move some records around to keep the
* tree balanced. Look at the left and right sibling blocks to
* see if we can re-balance by moving only one record.
*/
rbno = be32_to_cpu(block->bb_rightsib);
lbno = be32_to_cpu(block->bb_leftsib);
bno = NULLAGBLOCK;
ASSERT(rbno != NULLAGBLOCK || lbno != NULLAGBLOCK);
/*
* Duplicate the cursor so our btree manipulations here won't
* disrupt the next level up.
*/
if ((error = xfs_btree_dup_cursor(cur, &tcur)))
return error;
/*
* If there's a right sibling, see if it's ok to shift an entry
* out of it.
*/
if (rbno != NULLAGBLOCK) {
/*
* Move the temp cursor to the last entry in the next block.
* Actually any entry but the first would suffice.
*/
i = xfs_btree_lastrec(tcur, level);
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
if ((error = xfs_btree_increment(tcur, level, &i)))
goto error0;
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
i = xfs_btree_lastrec(tcur, level);
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
/*
* Grab a pointer to the block.
*/
rbp = tcur->bc_bufs[level];
right = XFS_BUF_TO_INOBT_BLOCK(rbp);
#ifdef DEBUG
if ((error = xfs_btree_check_sblock(cur, right, level, rbp)))
goto error0;
#endif
/*
* Grab the current block number, for future use.
*/
bno = be32_to_cpu(right->bb_leftsib);
/*
* If right block is full enough so that removing one entry
* won't make it too empty, and left-shifting an entry out
* of right to us works, we're done.
*/
if (be16_to_cpu(right->bb_numrecs) - 1 >=
XFS_INOBT_BLOCK_MINRECS(level, cur)) {
if ((error = xfs_btree_lshift(tcur, level, &i)))
goto error0;
if (i) {
ASSERT(be16_to_cpu(block->bb_numrecs) >=
XFS_INOBT_BLOCK_MINRECS(level, cur));
xfs_btree_del_cursor(tcur,
XFS_BTREE_NOERROR);
if (level > 0 &&
(error = xfs_btree_decrement(cur, level,
&i)))
return error;
*stat = 1;
return 0;
}
}
/*
* Otherwise, grab the number of records in right for
* future reference, and fix up the temp cursor to point
* to our block again (last record).
*/
rrecs = be16_to_cpu(right->bb_numrecs);
if (lbno != NULLAGBLOCK) {
xfs_btree_firstrec(tcur, level);
if ((error = xfs_btree_decrement(tcur, level, &i)))
goto error0;
}
}
/*
* If there's a left sibling, see if it's ok to shift an entry
* out of it.
*/
if (lbno != NULLAGBLOCK) {
/*
* Move the temp cursor to the first entry in the
* previous block.
*/
xfs_btree_firstrec(tcur, level);
if ((error = xfs_btree_decrement(tcur, level, &i)))
goto error0;
xfs_btree_firstrec(tcur, level);
/*
* Grab a pointer to the block.
*/
lbp = tcur->bc_bufs[level];
left = XFS_BUF_TO_INOBT_BLOCK(lbp);
#ifdef DEBUG
if ((error = xfs_btree_check_sblock(cur, left, level, lbp)))
goto error0;
#endif
/*
* Grab the current block number, for future use.
*/
bno = be32_to_cpu(left->bb_rightsib);
/*
* If left block is full enough so that removing one entry
* won't make it too empty, and right-shifting an entry out
* of left to us works, we're done.
*/
if (be16_to_cpu(left->bb_numrecs) - 1 >=
XFS_INOBT_BLOCK_MINRECS(level, cur)) {
if ((error = xfs_btree_rshift(tcur, level, &i)))
goto error0;
if (i) {
ASSERT(be16_to_cpu(block->bb_numrecs) >=
XFS_INOBT_BLOCK_MINRECS(level, cur));
xfs_btree_del_cursor(tcur,
XFS_BTREE_NOERROR);
if (level == 0)
cur->bc_ptrs[0]++;
*stat = 1;
return 0;
}
}
/*
* Otherwise, grab the number of records in right for
* future reference.
*/
lrecs = be16_to_cpu(left->bb_numrecs);
}
/*
* Delete the temp cursor, we're done with it.
*/
xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
/*
* If here, we need to do a join to keep the tree balanced.
*/
ASSERT(bno != NULLAGBLOCK);
/*
* See if we can join with the left neighbor block.
*/
if (lbno != NULLAGBLOCK &&
lrecs + numrecs <= XFS_INOBT_BLOCK_MAXRECS(level, cur)) {
/*
* Set "right" to be the starting block,
* "left" to be the left neighbor.
*/
rbno = bno;
right = block;
rrecs = be16_to_cpu(right->bb_numrecs);
rbp = bp;
if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
cur->bc_private.a.agno, lbno, 0, &lbp,
XFS_INO_BTREE_REF)))
return error;
left = XFS_BUF_TO_INOBT_BLOCK(lbp);
lrecs = be16_to_cpu(left->bb_numrecs);
if ((error = xfs_btree_check_sblock(cur, left, level, lbp)))
return error;
}
/*
* If that won't work, see if we can join with the right neighbor block.
*/
else if (rbno != NULLAGBLOCK &&
rrecs + numrecs <= XFS_INOBT_BLOCK_MAXRECS(level, cur)) {
/*
* Set "left" to be the starting block,
* "right" to be the right neighbor.
*/
lbno = bno;
left = block;
lrecs = be16_to_cpu(left->bb_numrecs);
lbp = bp;
if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
cur->bc_private.a.agno, rbno, 0, &rbp,
XFS_INO_BTREE_REF)))
return error;
right = XFS_BUF_TO_INOBT_BLOCK(rbp);
rrecs = be16_to_cpu(right->bb_numrecs);
if ((error = xfs_btree_check_sblock(cur, right, level, rbp)))
return error;
}
/*
* Otherwise, we can't fix the imbalance.
* Just return. This is probably a logic error, but it's not fatal.
*/
else {
if (level > 0 && (error = xfs_btree_decrement(cur, level, &i)))
return error;
*stat = 1;
return 0;
}
/*
* We're now going to join "left" and "right" by moving all the stuff
* in "right" to "left" and deleting "right".
*/
if (level > 0) {
/*
* It's a non-leaf. Move keys and pointers.
*/
lkp = XFS_INOBT_KEY_ADDR(left, lrecs + 1, cur);
lpp = XFS_INOBT_PTR_ADDR(left, lrecs + 1, cur);
rkp = XFS_INOBT_KEY_ADDR(right, 1, cur);
rpp = XFS_INOBT_PTR_ADDR(right, 1, cur);
#ifdef DEBUG
for (i = 0; i < rrecs; i++) {
if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(rpp[i]), level)))
return error;
}
#endif
memcpy(lkp, rkp, rrecs * sizeof(*lkp));
memcpy(lpp, rpp, rrecs * sizeof(*lpp));
xfs_inobt_log_keys(cur, lbp, lrecs + 1, lrecs + rrecs);
xfs_inobt_log_ptrs(cur, lbp, lrecs + 1, lrecs + rrecs);
} else {
/*
* It's a leaf. Move records.
*/
lrp = XFS_INOBT_REC_ADDR(left, lrecs + 1, cur);
rrp = XFS_INOBT_REC_ADDR(right, 1, cur);
memcpy(lrp, rrp, rrecs * sizeof(*lrp));
xfs_inobt_log_recs(cur, lbp, lrecs + 1, lrecs + rrecs);
}
/*
* If we joined with the left neighbor, set the buffer in the
* cursor to the left block, and fix up the index.
*/
if (bp != lbp) {
xfs_btree_setbuf(cur, level, lbp);
cur->bc_ptrs[level] += lrecs;
}
/*
* If we joined with the right neighbor and there's a level above
* us, increment the cursor at that level.
*/
else if (level + 1 < cur->bc_nlevels &&
(error = xfs_btree_increment(cur, level + 1, &i)))
return error;
/*
* Fix up the number of records in the surviving block.
*/
lrecs += rrecs;
left->bb_numrecs = cpu_to_be16(lrecs);
/*
* Fix up the right block pointer in the surviving block, and log it.
*/
left->bb_rightsib = right->bb_rightsib;
xfs_inobt_log_block(cur->bc_tp, lbp, XFS_BB_NUMRECS | XFS_BB_RIGHTSIB);
/*
* If there is a right sibling now, make it point to the
* remaining block.
*/
if (be32_to_cpu(left->bb_rightsib) != NULLAGBLOCK) {
xfs_inobt_block_t *rrblock;
xfs_buf_t *rrbp;
if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
cur->bc_private.a.agno, be32_to_cpu(left->bb_rightsib), 0,
&rrbp, XFS_INO_BTREE_REF)))
return error;
rrblock = XFS_BUF_TO_INOBT_BLOCK(rrbp);
if ((error = xfs_btree_check_sblock(cur, rrblock, level, rrbp)))
return error;
rrblock->bb_leftsib = cpu_to_be32(lbno);
xfs_inobt_log_block(cur->bc_tp, rrbp, XFS_BB_LEFTSIB);
}
/*
* Free the deleting block.
*/
if ((error = xfs_free_extent(cur->bc_tp, XFS_AGB_TO_FSB(mp,
cur->bc_private.a.agno, rbno), 1)))
return error;
xfs_trans_binval(cur->bc_tp, rbp);
/*
* Readjust the ptr at this level if it's not a leaf, since it's
* still pointing at the deletion point, which makes the cursor
* inconsistent. If this makes the ptr 0, the caller fixes it up.
* We can't use decrement because it would change the next level up.
*/
if (level > 0)
cur->bc_ptrs[level]--;
/*
* Return value means the next level up has something to do.
*/
*stat = 2;
return 0;
error0:
xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR);
return error;
}
/*
* Log header fields from a btree block.
*/
STATIC void
xfs_inobt_log_block(
xfs_trans_t *tp, /* transaction pointer */
xfs_buf_t *bp, /* buffer containing btree block */
int fields) /* mask of fields: XFS_BB_... */
{
int first; /* first byte offset logged */
int last; /* last byte offset logged */
static const short offsets[] = { /* table of offsets */
offsetof(xfs_inobt_block_t, bb_magic),
offsetof(xfs_inobt_block_t, bb_level),
offsetof(xfs_inobt_block_t, bb_numrecs),
offsetof(xfs_inobt_block_t, bb_leftsib),
offsetof(xfs_inobt_block_t, bb_rightsib),
sizeof(xfs_inobt_block_t)
};
xfs_btree_offsets(fields, offsets, XFS_BB_NUM_BITS, &first, &last);
xfs_trans_log_buf(tp, bp, first, last);
}
/*
* Log keys from a btree block (nonleaf).
*/
STATIC void
xfs_inobt_log_keys(
xfs_btree_cur_t *cur, /* btree cursor */
xfs_buf_t *bp, /* buffer containing btree block */
int kfirst, /* index of first key to log */
int klast) /* index of last key to log */
{
xfs_inobt_block_t *block; /* btree block to log from */
int first; /* first byte offset logged */
xfs_inobt_key_t *kp; /* key pointer in btree block */
int last; /* last byte offset logged */
block = XFS_BUF_TO_INOBT_BLOCK(bp);
kp = XFS_INOBT_KEY_ADDR(block, 1, cur);
first = (int)((xfs_caddr_t)&kp[kfirst - 1] - (xfs_caddr_t)block);
last = (int)(((xfs_caddr_t)&kp[klast] - 1) - (xfs_caddr_t)block);
xfs_trans_log_buf(cur->bc_tp, bp, first, last);
}
/*
* Log block pointer fields from a btree block (nonleaf).
*/
STATIC void
xfs_inobt_log_ptrs(
xfs_btree_cur_t *cur, /* btree cursor */
xfs_buf_t *bp, /* buffer containing btree block */
int pfirst, /* index of first pointer to log */
int plast) /* index of last pointer to log */
{
xfs_inobt_block_t *block; /* btree block to log from */
int first; /* first byte offset logged */
int last; /* last byte offset logged */
xfs_inobt_ptr_t *pp; /* block-pointer pointer in btree blk */
block = XFS_BUF_TO_INOBT_BLOCK(bp);
pp = XFS_INOBT_PTR_ADDR(block, 1, cur);
first = (int)((xfs_caddr_t)&pp[pfirst - 1] - (xfs_caddr_t)block);
last = (int)(((xfs_caddr_t)&pp[plast] - 1) - (xfs_caddr_t)block);
xfs_trans_log_buf(cur->bc_tp, bp, first, last);
}
/*
* Log records from a btree block (leaf).
*/
STATIC void
xfs_inobt_log_recs(
xfs_btree_cur_t *cur, /* btree cursor */
xfs_buf_t *bp, /* buffer containing btree block */
int rfirst, /* index of first record to log */
int rlast) /* index of last record to log */
{
xfs_inobt_block_t *block; /* btree block to log from */
int first; /* first byte offset logged */
int last; /* last byte offset logged */
xfs_inobt_rec_t *rp; /* record pointer for btree block */
block = XFS_BUF_TO_INOBT_BLOCK(bp);
rp = XFS_INOBT_REC_ADDR(block, 1, cur);
first = (int)((xfs_caddr_t)&rp[rfirst - 1] - (xfs_caddr_t)block);
last = (int)(((xfs_caddr_t)&rp[rlast] - 1) - (xfs_caddr_t)block);
xfs_trans_log_buf(cur->bc_tp, bp, first, last);
}
/*
* Externally visible routines.
*/
/*
* Delete the record pointed to by cur.
* The cursor refers to the place where the record was (could be inserted)
* when the operation returns.
*/
int /* error */
xfs_inobt_delete(
xfs_btree_cur_t *cur, /* btree cursor */
int *stat) /* success/failure */
{
int error;
int i; /* result code */
int level; /* btree level */
/*
* Go up the tree, starting at leaf level.
* If 2 is returned then a join was done; go to the next level.
* Otherwise we are done.
*/
for (level = 0, i = 2; i == 2; level++) {
if ((error = xfs_inobt_delrec(cur, level, &i)))
return error;
}
if (i == 0) {
for (level = 1; level < cur->bc_nlevels; level++) {
if (cur->bc_ptrs[level] == 0) {
if ((error = xfs_btree_decrement(cur, level, &i)))
return error;
break;
}
}
}
*stat = i;
return 0;
}
/*
* Get the data from the pointed-to record.
@ -690,6 +85,13 @@ xfs_inobt_get_rec(
return 0;
}
STATIC int
xfs_inobt_get_minrecs(
struct xfs_btree_cur *cur,
int level)
{
return cur->bc_mp->m_inobt_mnr[level != 0];
}
STATIC struct xfs_btree_cur *
xfs_inobt_dup_cursor(
@ -829,6 +231,38 @@ xfs_inobt_key_diff(
cur->bc_rec.i.ir_startino;
}
STATIC int
xfs_inobt_kill_root(
struct xfs_btree_cur *cur,
struct xfs_buf *bp,
int level,
union xfs_btree_ptr *newroot)
{
int error;
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
XFS_BTREE_STATS_INC(cur, killroot);
/*
* Update the root pointer, decreasing the level by 1 and then
* free the old root.
*/
xfs_inobt_set_root(cur, newroot, -1);
error = xfs_inobt_free_block(cur, bp);
if (error) {
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
return error;
}
XFS_BTREE_STATS_INC(cur, free);
cur->bc_bufs[level] = NULL;
cur->bc_nlevels--;
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
return 0;
}
#ifdef XFS_BTREE_TRACE
ktrace_t *xfs_inobt_trace_buf;
@ -901,8 +335,10 @@ static const struct xfs_btree_ops xfs_inobt_ops = {
.dup_cursor = xfs_inobt_dup_cursor,
.set_root = xfs_inobt_set_root,
.kill_root = xfs_inobt_kill_root,
.alloc_block = xfs_inobt_alloc_block,
.free_block = xfs_inobt_free_block,
.get_minrecs = xfs_inobt_get_minrecs,
.get_maxrecs = xfs_inobt_get_maxrecs,
.init_key_from_rec = xfs_inobt_init_key_from_rec,
.init_rec_from_key = xfs_inobt_init_rec_from_key,

7
fs/xfs/xfs_ialloc_btree.h
View File

@ -116,13 +116,6 @@ typedef struct xfs_btree_sblock xfs_inobt_block_t;
(XFS_BTREE_PTR_ADDR(xfs_inobt, bb, \
i, XFS_INOBT_BLOCK_MAXRECS(1, cur)))
/*
* Delete the record pointed to by cur.
* The cursor refers to the place where the record was (could be inserted)
* when the operation returns.
*/
extern int xfs_inobt_delete(struct xfs_btree_cur *cur, int *stat);
/*
* Get the data from the pointed-to record.
*/