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kernel-fxtec-pro1x/fs/xfs/xfs_bmap_btree.c
Christoph Hellwig d4b3a4b7dd [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>
2008-10-30 16:57:51 +11:00

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/*
* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_types.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_inode_item.h"
#include "xfs_alloc.h"
#include "xfs_btree.h"
#include "xfs_btree_trace.h"
#include "xfs_ialloc.h"
#include "xfs_itable.h"
#include "xfs_bmap.h"
#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
#define ERROR XBT_ERROR
#define EXIT XBT_EXIT
/*
* Keep the XFS_BMBT_TRACE_ names around for now until all code using them
* is converted to be generic and thus switches to the XFS_BTREE_TRACE_ names.
*/
#define XFS_BMBT_TRACE_ARGBI(c,b,i) \
XFS_BTREE_TRACE_ARGBI(c,b,i)
#define XFS_BMBT_TRACE_ARGBII(c,b,i,j) \
XFS_BTREE_TRACE_ARGBII(c,b,i,j)
#define XFS_BMBT_TRACE_ARGFFFI(c,o,b,i,j) \
XFS_BTREE_TRACE_ARGFFFI(c,o,b,i,j)
#define XFS_BMBT_TRACE_ARGI(c,i) \
XFS_BTREE_TRACE_ARGI(c,i)
#define XFS_BMBT_TRACE_ARGIFK(c,i,f,s) \
XFS_BTREE_TRACE_ARGIPK(c,i,(union xfs_btree_ptr)f,s)
#define XFS_BMBT_TRACE_ARGIFR(c,i,f,r) \
XFS_BTREE_TRACE_ARGIPR(c,i, \
(union xfs_btree_ptr)f, (union xfs_btree_rec *)r)
#define XFS_BMBT_TRACE_ARGIK(c,i,k) \
XFS_BTREE_TRACE_ARGIK(c,i,(union xfs_btree_key *)k)
#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.
*/
/* ARGSUSED */
STATIC xfs_exntst_t
xfs_extent_state(
xfs_filblks_t blks,
int extent_flag)
{
if (extent_flag) {
ASSERT(blks != 0); /* saved for DMIG */
return XFS_EXT_UNWRITTEN;
}
return XFS_EXT_NORM;
}
/*
* Convert on-disk form of btree root to in-memory form.
*/
void
xfs_bmdr_to_bmbt(
xfs_bmdr_block_t *dblock,
int dblocklen,
xfs_bmbt_block_t *rblock,
int rblocklen)
{
int dmxr;
xfs_bmbt_key_t *fkp;
__be64 *fpp;
xfs_bmbt_key_t *tkp;
__be64 *tpp;
rblock->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
rblock->bb_level = dblock->bb_level;
ASSERT(be16_to_cpu(rblock->bb_level) > 0);
rblock->bb_numrecs = dblock->bb_numrecs;
rblock->bb_leftsib = cpu_to_be64(NULLDFSBNO);
rblock->bb_rightsib = cpu_to_be64(NULLDFSBNO);
dmxr = (int)XFS_BTREE_BLOCK_MAXRECS(dblocklen, xfs_bmdr, 0);
fkp = XFS_BTREE_KEY_ADDR(xfs_bmdr, dblock, 1);
tkp = XFS_BMAP_BROOT_KEY_ADDR(rblock, 1, rblocklen);
fpp = XFS_BTREE_PTR_ADDR(xfs_bmdr, dblock, 1, dmxr);
tpp = XFS_BMAP_BROOT_PTR_ADDR(rblock, 1, rblocklen);
dmxr = be16_to_cpu(dblock->bb_numrecs);
memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
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,
* xfs_bmbt_get_startblock, xfs_bmbt_get_blockcount and xfs_bmbt_get_state.
*/
STATIC_INLINE void
__xfs_bmbt_get_all(
__uint64_t l0,
__uint64_t l1,
xfs_bmbt_irec_t *s)
{
int ext_flag;
xfs_exntst_t st;
ext_flag = (int)(l0 >> (64 - BMBT_EXNTFLAG_BITLEN));
s->br_startoff = ((xfs_fileoff_t)l0 &
XFS_MASK64LO(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
#if XFS_BIG_BLKNOS
s->br_startblock = (((xfs_fsblock_t)l0 & XFS_MASK64LO(9)) << 43) |
(((xfs_fsblock_t)l1) >> 21);
#else
#ifdef DEBUG
{
xfs_dfsbno_t b;
b = (((xfs_dfsbno_t)l0 & XFS_MASK64LO(9)) << 43) |
(((xfs_dfsbno_t)l1) >> 21);
ASSERT((b >> 32) == 0 || ISNULLDSTARTBLOCK(b));
s->br_startblock = (xfs_fsblock_t)b;
}
#else /* !DEBUG */
s->br_startblock = (xfs_fsblock_t)(((xfs_dfsbno_t)l1) >> 21);
#endif /* DEBUG */
#endif /* XFS_BIG_BLKNOS */
s->br_blockcount = (xfs_filblks_t)(l1 & XFS_MASK64LO(21));
/* This is xfs_extent_state() in-line */
if (ext_flag) {
ASSERT(s->br_blockcount != 0); /* saved for DMIG */
st = XFS_EXT_UNWRITTEN;
} else
st = XFS_EXT_NORM;
s->br_state = st;
}
void
xfs_bmbt_get_all(
xfs_bmbt_rec_host_t *r,
xfs_bmbt_irec_t *s)
{
__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.
*/
xfs_filblks_t
xfs_bmbt_get_blockcount(
xfs_bmbt_rec_host_t *r)
{
return (xfs_filblks_t)(r->l1 & XFS_MASK64LO(21));
}
/*
* Extract the startblock field from an in memory bmap extent record.
*/
xfs_fsblock_t
xfs_bmbt_get_startblock(
xfs_bmbt_rec_host_t *r)
{
#if XFS_BIG_BLKNOS
return (((xfs_fsblock_t)r->l0 & XFS_MASK64LO(9)) << 43) |
(((xfs_fsblock_t)r->l1) >> 21);
#else
#ifdef DEBUG
xfs_dfsbno_t b;
b = (((xfs_dfsbno_t)r->l0 & XFS_MASK64LO(9)) << 43) |
(((xfs_dfsbno_t)r->l1) >> 21);
ASSERT((b >> 32) == 0 || ISNULLDSTARTBLOCK(b));
return (xfs_fsblock_t)b;
#else /* !DEBUG */
return (xfs_fsblock_t)(((xfs_dfsbno_t)r->l1) >> 21);
#endif /* DEBUG */
#endif /* XFS_BIG_BLKNOS */
}
/*
* Extract the startoff field from an in memory bmap extent record.
*/
xfs_fileoff_t
xfs_bmbt_get_startoff(
xfs_bmbt_rec_host_t *r)
{
return ((xfs_fileoff_t)r->l0 &
XFS_MASK64LO(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
}
xfs_exntst_t
xfs_bmbt_get_state(
xfs_bmbt_rec_host_t *r)
{
int ext_flag;
ext_flag = (int)((r->l0) >> (64 - BMBT_EXNTFLAG_BITLEN));
return xfs_extent_state(xfs_bmbt_get_blockcount(r),
ext_flag);
}
/* Endian flipping versions of the bmbt extraction functions */
void
xfs_bmbt_disk_get_all(
xfs_bmbt_rec_t *r,
xfs_bmbt_irec_t *s)
{
__xfs_bmbt_get_all(be64_to_cpu(r->l0), be64_to_cpu(r->l1), s);
}
/*
* Extract the blockcount field from an on disk bmap extent record.
*/
xfs_filblks_t
xfs_bmbt_disk_get_blockcount(
xfs_bmbt_rec_t *r)
{
return (xfs_filblks_t)(be64_to_cpu(r->l1) & XFS_MASK64LO(21));
}
/*
* Extract the startoff field from a disk format bmap extent record.
*/
xfs_fileoff_t
xfs_bmbt_disk_get_startoff(
xfs_bmbt_rec_t *r)
{
return ((xfs_fileoff_t)be64_to_cpu(r->l0) &
XFS_MASK64LO(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
}
/*
* Log fields from the btree block header.
*/
void
xfs_bmbt_log_block(
xfs_btree_cur_t *cur,
xfs_buf_t *bp,
int fields)
{
int first;
int last;
xfs_trans_t *tp;
static const short offsets[] = {
offsetof(xfs_bmbt_block_t, bb_magic),
offsetof(xfs_bmbt_block_t, bb_level),
offsetof(xfs_bmbt_block_t, bb_numrecs),
offsetof(xfs_bmbt_block_t, bb_leftsib),
offsetof(xfs_bmbt_block_t, bb_rightsib),
sizeof(xfs_bmbt_block_t)
};
XFS_BMBT_TRACE_CURSOR(cur, ENTRY);
XFS_BMBT_TRACE_ARGBI(cur, bp, fields);
tp = cur->bc_tp;
if (bp) {
xfs_btree_offsets(fields, offsets, XFS_BB_NUM_BITS, &first,
&last);
xfs_trans_log_buf(tp, bp, first, last);
} else
xfs_trans_log_inode(tp, cur->bc_private.b.ip,
XFS_ILOG_FBROOT(cur->bc_private.b.whichfork));
XFS_BMBT_TRACE_CURSOR(cur, EXIT);
}
/*
* Log record values from the btree block.
*/
void
xfs_bmbt_log_recs(
xfs_btree_cur_t *cur,
xfs_buf_t *bp,
int rfirst,
int rlast)
{
xfs_bmbt_block_t *block;
int first;
int last;
xfs_bmbt_rec_t *rp;
xfs_trans_t *tp;
XFS_BMBT_TRACE_CURSOR(cur, ENTRY);
XFS_BMBT_TRACE_ARGBII(cur, bp, rfirst, rlast);
ASSERT(bp);
tp = cur->bc_tp;
block = XFS_BUF_TO_BMBT_BLOCK(bp);
rp = XFS_BMAP_REC_DADDR(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(tp, bp, first, last);
XFS_BMBT_TRACE_CURSOR(cur, EXIT);
}
/*
* Set all the fields in a bmap extent record from the arguments.
*/
void
xfs_bmbt_set_allf(
xfs_bmbt_rec_host_t *r,
xfs_fileoff_t startoff,
xfs_fsblock_t startblock,
xfs_filblks_t blockcount,
xfs_exntst_t state)
{
int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
ASSERT((startoff & XFS_MASK64HI(64-BMBT_STARTOFF_BITLEN)) == 0);
ASSERT((blockcount & XFS_MASK64HI(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
#if XFS_BIG_BLKNOS
ASSERT((startblock & XFS_MASK64HI(64-BMBT_STARTBLOCK_BITLEN)) == 0);
r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
((xfs_bmbt_rec_base_t)startoff << 9) |
((xfs_bmbt_rec_base_t)startblock >> 43);
r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
((xfs_bmbt_rec_base_t)blockcount &
(xfs_bmbt_rec_base_t)XFS_MASK64LO(21));
#else /* !XFS_BIG_BLKNOS */
if (ISNULLSTARTBLOCK(startblock)) {
r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
((xfs_bmbt_rec_base_t)startoff << 9) |
(xfs_bmbt_rec_base_t)XFS_MASK64LO(9);
r->l1 = XFS_MASK64HI(11) |
((xfs_bmbt_rec_base_t)startblock << 21) |
((xfs_bmbt_rec_base_t)blockcount &
(xfs_bmbt_rec_base_t)XFS_MASK64LO(21));
} else {
r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
((xfs_bmbt_rec_base_t)startoff << 9);
r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
((xfs_bmbt_rec_base_t)blockcount &
(xfs_bmbt_rec_base_t)XFS_MASK64LO(21));
}
#endif /* XFS_BIG_BLKNOS */
}
/*
* Set all the fields in a bmap extent record from the uncompressed form.
*/
void
xfs_bmbt_set_all(
xfs_bmbt_rec_host_t *r,
xfs_bmbt_irec_t *s)
{
xfs_bmbt_set_allf(r, s->br_startoff, s->br_startblock,
s->br_blockcount, s->br_state);
}
/*
* Set all the fields in a disk format bmap extent record from the arguments.
*/
void
xfs_bmbt_disk_set_allf(
xfs_bmbt_rec_t *r,
xfs_fileoff_t startoff,
xfs_fsblock_t startblock,
xfs_filblks_t blockcount,
xfs_exntst_t state)
{
int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
ASSERT((startoff & XFS_MASK64HI(64-BMBT_STARTOFF_BITLEN)) == 0);
ASSERT((blockcount & XFS_MASK64HI(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
#if XFS_BIG_BLKNOS
ASSERT((startblock & XFS_MASK64HI(64-BMBT_STARTBLOCK_BITLEN)) == 0);
r->l0 = cpu_to_be64(
((xfs_bmbt_rec_base_t)extent_flag << 63) |
((xfs_bmbt_rec_base_t)startoff << 9) |
((xfs_bmbt_rec_base_t)startblock >> 43));
r->l1 = cpu_to_be64(
((xfs_bmbt_rec_base_t)startblock << 21) |
((xfs_bmbt_rec_base_t)blockcount &
(xfs_bmbt_rec_base_t)XFS_MASK64LO(21)));
#else /* !XFS_BIG_BLKNOS */
if (ISNULLSTARTBLOCK(startblock)) {
r->l0 = cpu_to_be64(
((xfs_bmbt_rec_base_t)extent_flag << 63) |
((xfs_bmbt_rec_base_t)startoff << 9) |
(xfs_bmbt_rec_base_t)XFS_MASK64LO(9));
r->l1 = cpu_to_be64(XFS_MASK64HI(11) |
((xfs_bmbt_rec_base_t)startblock << 21) |
((xfs_bmbt_rec_base_t)blockcount &
(xfs_bmbt_rec_base_t)XFS_MASK64LO(21)));
} else {
r->l0 = cpu_to_be64(
((xfs_bmbt_rec_base_t)extent_flag << 63) |
((xfs_bmbt_rec_base_t)startoff << 9));
r->l1 = cpu_to_be64(
((xfs_bmbt_rec_base_t)startblock << 21) |
((xfs_bmbt_rec_base_t)blockcount &
(xfs_bmbt_rec_base_t)XFS_MASK64LO(21)));
}
#endif /* XFS_BIG_BLKNOS */
}
/*
* Set all the fields in a bmap extent record from the uncompressed form.
*/
void
xfs_bmbt_disk_set_all(
xfs_bmbt_rec_t *r,
xfs_bmbt_irec_t *s)
{
xfs_bmbt_disk_set_allf(r, s->br_startoff, s->br_startblock,
s->br_blockcount, s->br_state);
}
/*
* Set the blockcount field in a bmap extent record.
*/
void
xfs_bmbt_set_blockcount(
xfs_bmbt_rec_host_t *r,
xfs_filblks_t v)
{
ASSERT((v & XFS_MASK64HI(43)) == 0);
r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)XFS_MASK64HI(43)) |
(xfs_bmbt_rec_base_t)(v & XFS_MASK64LO(21));
}
/*
* Set the startblock field in a bmap extent record.
*/
void
xfs_bmbt_set_startblock(
xfs_bmbt_rec_host_t *r,
xfs_fsblock_t v)
{
#if XFS_BIG_BLKNOS
ASSERT((v & XFS_MASK64HI(12)) == 0);
r->l0 = (r->l0 & (xfs_bmbt_rec_base_t)XFS_MASK64HI(55)) |
(xfs_bmbt_rec_base_t)(v >> 43);
r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)XFS_MASK64LO(21)) |
(xfs_bmbt_rec_base_t)(v << 21);
#else /* !XFS_BIG_BLKNOS */
if (ISNULLSTARTBLOCK(v)) {
r->l0 |= (xfs_bmbt_rec_base_t)XFS_MASK64LO(9);
r->l1 = (xfs_bmbt_rec_base_t)XFS_MASK64HI(11) |
((xfs_bmbt_rec_base_t)v << 21) |
(r->l1 & (xfs_bmbt_rec_base_t)XFS_MASK64LO(21));
} else {
r->l0 &= ~(xfs_bmbt_rec_base_t)XFS_MASK64LO(9);
r->l1 = ((xfs_bmbt_rec_base_t)v << 21) |
(r->l1 & (xfs_bmbt_rec_base_t)XFS_MASK64LO(21));
}
#endif /* XFS_BIG_BLKNOS */
}
/*
* Set the startoff field in a bmap extent record.
*/
void
xfs_bmbt_set_startoff(
xfs_bmbt_rec_host_t *r,
xfs_fileoff_t v)
{
ASSERT((v & XFS_MASK64HI(9)) == 0);
r->l0 = (r->l0 & (xfs_bmbt_rec_base_t) XFS_MASK64HI(1)) |
((xfs_bmbt_rec_base_t)v << 9) |
(r->l0 & (xfs_bmbt_rec_base_t)XFS_MASK64LO(9));
}
/*
* Set the extent state field in a bmap extent record.
*/
void
xfs_bmbt_set_state(
xfs_bmbt_rec_host_t *r,
xfs_exntst_t v)
{
ASSERT(v == XFS_EXT_NORM || v == XFS_EXT_UNWRITTEN);
if (v == XFS_EXT_NORM)
r->l0 &= XFS_MASK64LO(64 - BMBT_EXNTFLAG_BITLEN);
else
r->l0 |= XFS_MASK64HI(BMBT_EXNTFLAG_BITLEN);
}
/*
* Convert in-memory form of btree root to on-disk form.
*/
void
xfs_bmbt_to_bmdr(
xfs_bmbt_block_t *rblock,
int rblocklen,
xfs_bmdr_block_t *dblock,
int dblocklen)
{
int dmxr;
xfs_bmbt_key_t *fkp;
__be64 *fpp;
xfs_bmbt_key_t *tkp;
__be64 *tpp;
ASSERT(be32_to_cpu(rblock->bb_magic) == XFS_BMAP_MAGIC);
ASSERT(be64_to_cpu(rblock->bb_leftsib) == NULLDFSBNO);
ASSERT(be64_to_cpu(rblock->bb_rightsib) == NULLDFSBNO);
ASSERT(be16_to_cpu(rblock->bb_level) > 0);
dblock->bb_level = rblock->bb_level;
dblock->bb_numrecs = rblock->bb_numrecs;
dmxr = (int)XFS_BTREE_BLOCK_MAXRECS(dblocklen, xfs_bmdr, 0);
fkp = XFS_BMAP_BROOT_KEY_ADDR(rblock, 1, rblocklen);
tkp = XFS_BTREE_KEY_ADDR(xfs_bmdr, dblock, 1);
fpp = XFS_BMAP_BROOT_PTR_ADDR(rblock, 1, rblocklen);
tpp = XFS_BTREE_PTR_ADDR(xfs_bmdr, dblock, 1, dmxr);
dmxr = be16_to_cpu(dblock->bb_numrecs);
memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
}
/*
* Check extent records, which have just been read, for
* any bit in the extent flag field. ASSERT on debug
* kernels, as this condition should not occur.
* Return an error condition (1) if any flags found,
* otherwise return 0.
*/
int
xfs_check_nostate_extents(
xfs_ifork_t *ifp,
xfs_extnum_t idx,
xfs_extnum_t num)
{
for (; num > 0; num--, idx++) {
xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
if ((ep->l0 >>
(64 - BMBT_EXNTFLAG_BITLEN)) != 0) {
ASSERT(0);
return 1;
}
}
return 0;
}
STATIC struct xfs_btree_cur *
xfs_bmbt_dup_cursor(
struct xfs_btree_cur *cur)
{
struct xfs_btree_cur *new;
new = xfs_bmbt_init_cursor(cur->bc_mp, cur->bc_tp,
cur->bc_private.b.ip, cur->bc_private.b.whichfork);
/*
* Copy the firstblock, flist, and flags values,
* since init cursor doesn't get them.
*/
new->bc_private.b.firstblock = cur->bc_private.b.firstblock;
new->bc_private.b.flist = cur->bc_private.b.flist;
new->bc_private.b.flags = cur->bc_private.b.flags;
return new;
}
STATIC void
xfs_bmbt_update_cursor(
struct xfs_btree_cur *src,
struct xfs_btree_cur *dst)
{
ASSERT((dst->bc_private.b.firstblock != NULLFSBLOCK) ||
(dst->bc_private.b.ip->i_d.di_flags & XFS_DIFLAG_REALTIME));
ASSERT(dst->bc_private.b.flist == src->bc_private.b.flist);
dst->bc_private.b.allocated += src->bc_private.b.allocated;
dst->bc_private.b.firstblock = src->bc_private.b.firstblock;
src->bc_private.b.allocated = 0;
}
STATIC int
xfs_bmbt_alloc_block(
struct xfs_btree_cur *cur,
union xfs_btree_ptr *start,
union xfs_btree_ptr *new,
int length,
int *stat)
{
xfs_alloc_arg_t args; /* block allocation args */
int error; /* error return value */
memset(&args, 0, sizeof(args));
args.tp = cur->bc_tp;
args.mp = cur->bc_mp;
args.fsbno = cur->bc_private.b.firstblock;
args.firstblock = args.fsbno;
if (args.fsbno == NULLFSBLOCK) {
args.fsbno = be64_to_cpu(start->l);
args.type = XFS_ALLOCTYPE_START_BNO;
/*
* Make sure there is sufficient room left in the AG to
* complete a full tree split for an extent insert. If
* we are converting the middle part of an extent then
* we may need space for two tree splits.
*
* We are relying on the caller to make the correct block
* reservation for this operation to succeed. If the
* reservation amount is insufficient then we may fail a
* block allocation here and corrupt the filesystem.
*/
args.minleft = xfs_trans_get_block_res(args.tp);
} else if (cur->bc_private.b.flist->xbf_low) {
args.type = XFS_ALLOCTYPE_START_BNO;
} else {
args.type = XFS_ALLOCTYPE_NEAR_BNO;
}
args.minlen = args.maxlen = args.prod = 1;
args.wasdel = cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL;
if (!args.wasdel && xfs_trans_get_block_res(args.tp) == 0) {
error = XFS_ERROR(ENOSPC);
goto error0;
}
error = xfs_alloc_vextent(&args);
if (error)
goto error0;
if (args.fsbno == NULLFSBLOCK && args.minleft) {
/*
* Could not find an AG with enough free space to satisfy
* a full btree split. Try again without minleft and if
* successful activate the lowspace algorithm.
*/
args.fsbno = 0;
args.type = XFS_ALLOCTYPE_FIRST_AG;
args.minleft = 0;
error = xfs_alloc_vextent(&args);
if (error)
goto error0;
cur->bc_private.b.flist->xbf_low = 1;
}
if (args.fsbno == NULLFSBLOCK) {
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
*stat = 0;
return 0;
}
ASSERT(args.len == 1);
cur->bc_private.b.firstblock = args.fsbno;
cur->bc_private.b.allocated++;
cur->bc_private.b.ip->i_d.di_nblocks++;
xfs_trans_log_inode(args.tp, cur->bc_private.b.ip, XFS_ILOG_CORE);
XFS_TRANS_MOD_DQUOT_BYINO(args.mp, args.tp, cur->bc_private.b.ip,
XFS_TRANS_DQ_BCOUNT, 1L);
new->l = cpu_to_be64(args.fsbno);
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
*stat = 1;
return 0;
error0:
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
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,
int level)
{
return XFS_BMAP_BLOCK_IMAXRECS(level, cur);
}
/*
* Get the maximum records we could store in the on-disk format.
*
* For non-root nodes this is equivalent to xfs_bmbt_get_maxrecs, but
* for the root node this checks the available space in the dinode fork
* so that we can resize the in-memory buffer to match it. After a
* resize to the maximum size this function returns the same value
* as xfs_bmbt_get_maxrecs for the root node, too.
*/
STATIC int
xfs_bmbt_get_dmaxrecs(
struct xfs_btree_cur *cur,
int level)
{
return XFS_BMAP_BLOCK_DMAXRECS(level, cur);
}
STATIC void
xfs_bmbt_init_key_from_rec(
union xfs_btree_key *key,
union xfs_btree_rec *rec)
{
key->bmbt.br_startoff =
cpu_to_be64(xfs_bmbt_disk_get_startoff(&rec->bmbt));
}
STATIC void
xfs_bmbt_init_rec_from_key(
union xfs_btree_key *key,
union xfs_btree_rec *rec)
{
ASSERT(key->bmbt.br_startoff != 0);
xfs_bmbt_disk_set_allf(&rec->bmbt, be64_to_cpu(key->bmbt.br_startoff),
0, 0, XFS_EXT_NORM);
}
STATIC void
xfs_bmbt_init_rec_from_cur(
struct xfs_btree_cur *cur,
union xfs_btree_rec *rec)
{
xfs_bmbt_disk_set_all(&rec->bmbt, &cur->bc_rec.b);
}
STATIC void
xfs_bmbt_init_ptr_from_cur(
struct xfs_btree_cur *cur,
union xfs_btree_ptr *ptr)
{
ptr->l = 0;
}
STATIC __int64_t
xfs_bmbt_key_diff(
struct xfs_btree_cur *cur,
union xfs_btree_key *key)
{
return (__int64_t)be64_to_cpu(key->bmbt.br_startoff) -
cur->bc_rec.b.br_startoff;
}
#ifdef XFS_BTREE_TRACE
ktrace_t *xfs_bmbt_trace_buf;
STATIC void
xfs_bmbt_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)
{
struct xfs_inode *ip = cur->bc_private.b.ip;
int whichfork = cur->bc_private.b.whichfork;
ktrace_enter(xfs_bmbt_trace_buf,
(void *)((__psint_t)type | (whichfork << 8) | (line << 16)),
(void *)func, (void *)s, (void *)ip, (void *)cur,
(void *)a0, (void *)a1, (void *)a2, (void *)a3,
(void *)a4, (void *)a5, (void *)a6, (void *)a7,
(void *)a8, (void *)a9, (void *)a10);
ktrace_enter(ip->i_btrace,
(void *)((__psint_t)type | (whichfork << 8) | (line << 16)),
(void *)func, (void *)s, (void *)ip, (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_bmbt_trace_cursor(
struct xfs_btree_cur *cur,
__uint32_t *s0,
__uint64_t *l0,
__uint64_t *l1)
{
struct xfs_bmbt_rec_host r;
xfs_bmbt_set_all(&r, &cur->bc_rec.b);
*s0 = (cur->bc_nlevels << 24) |
(cur->bc_private.b.flags << 16) |
cur->bc_private.b.allocated;
*l0 = r.l0;
*l1 = r.l1;
}
STATIC void
xfs_bmbt_trace_key(
struct xfs_btree_cur *cur,
union xfs_btree_key *key,
__uint64_t *l0,
__uint64_t *l1)
{
*l0 = be64_to_cpu(key->bmbt.br_startoff);
*l1 = 0;
}
STATIC void
xfs_bmbt_trace_record(
struct xfs_btree_cur *cur,
union xfs_btree_rec *rec,
__uint64_t *l0,
__uint64_t *l1,
__uint64_t *l2)
{
struct xfs_bmbt_irec irec;
xfs_bmbt_disk_get_all(&rec->bmbt, &irec);
*l0 = irec.br_startoff;
*l1 = irec.br_startblock;
*l2 = irec.br_blockcount;
}
#endif /* XFS_BTREE_TRACE */
static const struct xfs_btree_ops xfs_bmbt_ops = {
.rec_len = sizeof(xfs_bmbt_rec_t),
.key_len = sizeof(xfs_bmbt_key_t),
.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,
.init_rec_from_key = xfs_bmbt_init_rec_from_key,
.init_rec_from_cur = xfs_bmbt_init_rec_from_cur,
.init_ptr_from_cur = xfs_bmbt_init_ptr_from_cur,
.key_diff = xfs_bmbt_key_diff,
#ifdef XFS_BTREE_TRACE
.trace_enter = xfs_bmbt_trace_enter,
.trace_cursor = xfs_bmbt_trace_cursor,
.trace_key = xfs_bmbt_trace_key,
.trace_record = xfs_bmbt_trace_record,
#endif
};
/*
* Allocate a new bmap btree cursor.
*/
struct xfs_btree_cur * /* new bmap btree cursor */
xfs_bmbt_init_cursor(
struct xfs_mount *mp, /* file system mount point */
struct xfs_trans *tp, /* transaction pointer */
struct xfs_inode *ip, /* inode owning the btree */
int whichfork) /* data or attr fork */
{
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_btree_cur *cur;
cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
cur->bc_tp = tp;
cur->bc_mp = mp;
cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1;
cur->bc_btnum = XFS_BTNUM_BMAP;
cur->bc_blocklog = mp->m_sb.sb_blocklog;
cur->bc_ops = &xfs_bmbt_ops;
cur->bc_flags = XFS_BTREE_LONG_PTRS | XFS_BTREE_ROOT_IN_INODE;
cur->bc_private.b.forksize = XFS_IFORK_SIZE(ip, whichfork);
cur->bc_private.b.ip = ip;
cur->bc_private.b.firstblock = NULLFSBLOCK;
cur->bc_private.b.flist = NULL;
cur->bc_private.b.allocated = 0;
cur->bc_private.b.flags = 0;
cur->bc_private.b.whichfork = whichfork;
return cur;
}
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