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[XFS] move xfs_bmbt_killroot to common code 

xfs_bmbt_killroot is a mostly generic implementation of moving from a real
block based root to an inode based root. So move it to xfs_btree.c where
it can use all the nice infrastructure there and make it pointer size
agnostic

The new name for it is xfs_btree_kill_iroot, following the old naming but
making it clear we're dealing with the root in inode case here, and to
avoid confusion with xfs_btree_new_root which is used for the not inode
rooted case. I've also added a comment describing what it does and why
it's named the way it is.

SGI-PV: 985583

SGI-Modid: xfs-linux-melb:xfs-kern:32203a

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 16:57:51 +11:00 committed by Lachlan McIlroy
parent 4b22a57188
commit d4b3a4b7dd
5 changed files with 185 additions and 94 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
fs/xfs/xfs_alloc_btree.c
View File

@ -834,6 +834,37 @@ xfs_allocbt_alloc_block(
return 0;
}
STATIC int
xfs_allocbt_free_block(
struct xfs_btree_cur *cur,
struct xfs_buf *bp)
{
struct xfs_buf *agbp = cur->bc_private.a.agbp;
struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
xfs_agblock_t bno;
int error;
bno = XFS_DADDR_TO_AGBNO(cur->bc_mp, XFS_BUF_ADDR(bp));
error = xfs_alloc_put_freelist(cur->bc_tp, 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);
return 0;
}
/*
* Update the longest extent in the AGF
*/
@ -1025,6 +1056,7 @@ static const struct xfs_btree_ops xfs_allocbt_ops = {
.dup_cursor = xfs_allocbt_dup_cursor,
.set_root = xfs_allocbt_set_root,
.alloc_block = xfs_allocbt_alloc_block,
.free_block = xfs_allocbt_free_block,
.update_lastrec = xfs_allocbt_update_lastrec,
.get_maxrecs = xfs_allocbt_get_maxrecs,
.init_key_from_rec = xfs_allocbt_init_key_from_rec,

116
fs/xfs/xfs_bmap_btree.c
View File

@ -49,7 +49,6 @@
*/
STATIC int xfs_bmbt_killroot(xfs_btree_cur_t *);
STATIC void xfs_bmbt_log_keys(xfs_btree_cur_t *, xfs_buf_t *, int, int);
STATIC void xfs_bmbt_log_ptrs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
@ -194,7 +193,7 @@ xfs_bmbt_delrec(
if (level == cur->bc_nlevels - 1) {
xfs_iroot_realloc(cur->bc_private.b.ip, -1,
cur->bc_private.b.whichfork);
if ((error = xfs_bmbt_killroot(cur))) {
if ((error = xfs_btree_kill_iroot(cur))) {
XFS_BMBT_TRACE_CURSOR(cur, ERROR);
goto error0;
}
@ -228,7 +227,7 @@ xfs_bmbt_delrec(
*/
if (lbno == NULLFSBLOCK && rbno == NULLFSBLOCK &&
level == cur->bc_nlevels - 2) {
if ((error = xfs_bmbt_killroot(cur))) {
if ((error = xfs_btree_kill_iroot(cur))) {
XFS_BMBT_TRACE_CURSOR(cur, ERROR);
goto error0;
}
@ -456,97 +455,6 @@ error0:
return error;
}
STATIC int
xfs_bmbt_killroot(
xfs_btree_cur_t *cur)
{
xfs_bmbt_block_t *block;
xfs_bmbt_block_t *cblock;
xfs_buf_t *cbp;
xfs_bmbt_key_t *ckp;
xfs_bmbt_ptr_t *cpp;
#ifdef DEBUG
int error;
#endif
int i;
xfs_bmbt_key_t *kp;
xfs_inode_t *ip;
xfs_ifork_t *ifp;
int level;
xfs_bmbt_ptr_t *pp;
XFS_BMBT_TRACE_CURSOR(cur, ENTRY);
level = cur->bc_nlevels - 1;
ASSERT(level >= 1);
/*
* Don't deal with the root block needs to be a leaf case.
* We're just going to turn the thing back into extents anyway.
*/
if (level == 1) {
XFS_BMBT_TRACE_CURSOR(cur, EXIT);
return 0;
}
block = xfs_bmbt_get_block(cur, level, &cbp);
/*
* Give up if the root has multiple children.
*/
if (be16_to_cpu(block->bb_numrecs) != 1) {
XFS_BMBT_TRACE_CURSOR(cur, EXIT);
return 0;
}
/*
* Only do this if the next level will fit.
* Then the data must be copied up to the inode,
* instead of freeing the root you free the next level.
*/
cbp = cur->bc_bufs[level - 1];
cblock = XFS_BUF_TO_BMBT_BLOCK(cbp);
if (be16_to_cpu(cblock->bb_numrecs) > XFS_BMAP_BLOCK_DMAXRECS(level, cur)) {
XFS_BMBT_TRACE_CURSOR(cur, EXIT);
return 0;
}
ASSERT(be64_to_cpu(cblock->bb_leftsib) == NULLDFSBNO);
ASSERT(be64_to_cpu(cblock->bb_rightsib) == NULLDFSBNO);
ip = cur->bc_private.b.ip;
ifp = XFS_IFORK_PTR(ip, cur->bc_private.b.whichfork);
ASSERT(XFS_BMAP_BLOCK_IMAXRECS(level, cur) ==
XFS_BMAP_BROOT_MAXRECS(ifp->if_broot_bytes));
i = (int)(be16_to_cpu(cblock->bb_numrecs) - XFS_BMAP_BLOCK_IMAXRECS(level, cur));
if (i) {
xfs_iroot_realloc(ip, i, cur->bc_private.b.whichfork);
block = ifp->if_broot;
}
be16_add_cpu(&block->bb_numrecs, i);
ASSERT(block->bb_numrecs == cblock->bb_numrecs);
kp = XFS_BMAP_KEY_IADDR(block, 1, cur);
ckp = XFS_BMAP_KEY_IADDR(cblock, 1, cur);
memcpy(kp, ckp, be16_to_cpu(block->bb_numrecs) * sizeof(*kp));
pp = XFS_BMAP_PTR_IADDR(block, 1, cur);
cpp = XFS_BMAP_PTR_IADDR(cblock, 1, cur);
#ifdef DEBUG
for (i = 0; i < be16_to_cpu(cblock->bb_numrecs); i++) {
if ((error = xfs_btree_check_lptr_disk(cur, cpp[i], level - 1))) {
XFS_BMBT_TRACE_CURSOR(cur, ERROR);
return error;
}
}
#endif
memcpy(pp, cpp, be16_to_cpu(block->bb_numrecs) * sizeof(*pp));
xfs_bmap_add_free(XFS_DADDR_TO_FSB(cur->bc_mp, XFS_BUF_ADDR(cbp)), 1,
cur->bc_private.b.flist, cur->bc_mp);
ip->i_d.di_nblocks--;
XFS_TRANS_MOD_DQUOT_BYINO(cur->bc_mp, cur->bc_tp, ip,
XFS_TRANS_DQ_BCOUNT, -1L);
xfs_trans_binval(cur->bc_tp, cbp);
cur->bc_bufs[level - 1] = NULL;
be16_add_cpu(&block->bb_level, -1);
xfs_trans_log_inode(cur->bc_tp, ip,
XFS_ILOG_CORE | XFS_ILOG_FBROOT(cur->bc_private.b.whichfork));
cur->bc_nlevels--;
XFS_BMBT_TRACE_CURSOR(cur, EXIT);
return 0;
}
/*
* Log key values from the btree block.
*/
@ -1298,6 +1206,25 @@ xfs_bmbt_alloc_block(
return error;
}
STATIC int
xfs_bmbt_free_block(
struct xfs_btree_cur *cur,
struct xfs_buf *bp)
{
struct xfs_mount *mp = cur->bc_mp;
struct xfs_inode *ip = cur->bc_private.b.ip;
struct xfs_trans *tp = cur->bc_tp;
xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
xfs_bmap_add_free(fsbno, 1, cur->bc_private.b.flist, mp);
ip->i_d.di_nblocks--;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
xfs_trans_binval(tp, bp);
return 0;
}
STATIC int
xfs_bmbt_get_maxrecs(
struct xfs_btree_cur *cur,
@ -1460,6 +1387,7 @@ static const struct xfs_btree_ops xfs_bmbt_ops = {
.dup_cursor = xfs_bmbt_dup_cursor,
.update_cursor = xfs_bmbt_update_cursor,
.alloc_block = xfs_bmbt_alloc_block,
.free_block = xfs_bmbt_free_block,
.get_maxrecs = xfs_bmbt_get_maxrecs,
.get_dmaxrecs = xfs_bmbt_get_dmaxrecs,
.init_key_from_rec = xfs_bmbt_init_key_from_rec,

112
fs/xfs/xfs_btree.c
View File

@ -3059,3 +3059,115 @@ error0:
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
return error;
}
/*
* Try to merge a non-leaf block back into the inode root.
*
* Note: the killroot names comes from the fact that we're effectively
* killing the old root block. But because we can't just delete the
* inode we have to copy the single block it was pointing to into the
* inode.
*/
int
xfs_btree_kill_iroot(
struct xfs_btree_cur *cur)
{
int whichfork = cur->bc_private.b.whichfork;
struct xfs_inode *ip = cur->bc_private.b.ip;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_btree_block *block;
struct xfs_btree_block *cblock;
union xfs_btree_key *kp;
union xfs_btree_key *ckp;
union xfs_btree_ptr *pp;
union xfs_btree_ptr *cpp;
struct xfs_buf *cbp;
int level;
int index;
int numrecs;
#ifdef DEBUG
union xfs_btree_ptr ptr;
int i;
#endif
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
ASSERT(cur->bc_flags & XFS_BTREE_ROOT_IN_INODE);
ASSERT(cur->bc_nlevels > 1);
/*
* Don't deal with the root block needs to be a leaf case.
* We're just going to turn the thing back into extents anyway.
*/
level = cur->bc_nlevels - 1;
if (level == 1)
goto out0;
/*
* Give up if the root has multiple children.
*/
block = xfs_btree_get_iroot(cur);
if (xfs_btree_get_numrecs(block) != 1)
goto out0;
cblock = xfs_btree_get_block(cur, level - 1, &cbp);
numrecs = xfs_btree_get_numrecs(cblock);
/*
* Only do this if the next level will fit.
* Then the data must be copied up to the inode,
* instead of freeing the root you free the next level.
*/
if (numrecs > cur->bc_ops->get_dmaxrecs(cur, level))
goto out0;
XFS_BTREE_STATS_INC(cur, killroot);
#ifdef DEBUG
xfs_btree_get_sibling(cur, block, &ptr, XFS_BB_LEFTSIB);
ASSERT(xfs_btree_ptr_is_null(cur, &ptr));
xfs_btree_get_sibling(cur, block, &ptr, XFS_BB_RIGHTSIB);
ASSERT(xfs_btree_ptr_is_null(cur, &ptr));
#endif
index = numrecs - cur->bc_ops->get_maxrecs(cur, level);
if (index) {
xfs_iroot_realloc(cur->bc_private.b.ip, index,
cur->bc_private.b.whichfork);
block = (struct xfs_btree_block *)ifp->if_broot;
}
be16_add_cpu(&block->bb_numrecs, index);
ASSERT(block->bb_numrecs == cblock->bb_numrecs);
kp = xfs_btree_key_addr(cur, 1, block);
ckp = xfs_btree_key_addr(cur, 1, cblock);
xfs_btree_copy_keys(cur, kp, ckp, numrecs);
pp = xfs_btree_ptr_addr(cur, 1, block);
cpp = xfs_btree_ptr_addr(cur, 1, cblock);
#ifdef DEBUG
for (i = 0; i < numrecs; i++) {
int error;
error = xfs_btree_check_ptr(cur, cpp, i, level - 1);
if (error) {
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
return error;
}
}
#endif
xfs_btree_copy_ptrs(cur, pp, cpp, numrecs);
cur->bc_ops->free_block(cur, cbp);
XFS_BTREE_STATS_INC(cur, free);
cur->bc_bufs[level - 1] = NULL;
be16_add_cpu(&block->bb_level, -1);
xfs_trans_log_inode(cur->bc_tp, ip,
XFS_ILOG_CORE | XFS_ILOG_FBROOT(cur->bc_private.b.whichfork));
cur->bc_nlevels--;
out0:
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
return 0;
}

2
fs/xfs/xfs_btree.h
View File

@ -198,6 +198,7 @@ struct xfs_btree_ops {
union xfs_btree_ptr *start_bno,
union xfs_btree_ptr *new_bno,
int length, int *stat);
int (*free_block)(struct xfs_btree_cur *cur, struct xfs_buf *bp);
/* update last record information */
void (*update_lastrec)(struct xfs_btree_cur *cur,
@ -559,6 +560,7 @@ int xfs_btree_split(struct xfs_btree_cur *, int, union xfs_btree_ptr *,
union xfs_btree_key *, struct xfs_btree_cur **, int *);
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 *);
/*

17
fs/xfs/xfs_ialloc_btree.c
View File

@ -754,6 +754,22 @@ xfs_inobt_alloc_block(
return 0;
}
STATIC int
xfs_inobt_free_block(
struct xfs_btree_cur *cur,
struct xfs_buf *bp)
{
xfs_fsblock_t fsbno;
int error;
fsbno = XFS_DADDR_TO_FSB(cur->bc_mp, XFS_BUF_ADDR(bp));
error = xfs_free_extent(cur->bc_tp, fsbno, 1);
if (error)
return error;
xfs_trans_binval(cur->bc_tp, bp);
return error;
}
STATIC int
xfs_inobt_get_maxrecs(
@ -886,6 +902,7 @@ static const struct xfs_btree_ops xfs_inobt_ops = {
.dup_cursor = xfs_inobt_dup_cursor,
.set_root = xfs_inobt_set_root,
.alloc_block = xfs_inobt_alloc_block,
.free_block = xfs_inobt_free_block,
.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,