7038f1cbac
The xtTruncate code was only doing this for leaf pages. When a file is horribly fragmented, we may truncate a file leaving an internal page with an invalid head.next field, which may cause a stale page to be referenced. Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
4167 lines
98 KiB
C
4167 lines
98 KiB
C
/*
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* Copyright (C) International Business Machines Corp., 2000-2005
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* jfs_xtree.c: extent allocation descriptor B+-tree manager
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*/
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#include <linux/fs.h>
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#include <linux/quotaops.h>
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#include "jfs_incore.h"
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#include "jfs_filsys.h"
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#include "jfs_metapage.h"
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#include "jfs_dmap.h"
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#include "jfs_dinode.h"
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#include "jfs_superblock.h"
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#include "jfs_debug.h"
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/*
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* xtree local flag
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*/
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#define XT_INSERT 0x00000001
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/*
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* xtree key/entry comparison: extent offset
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*
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* return:
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* -1: k < start of extent
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* 0: start_of_extent <= k <= end_of_extent
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* 1: k > end_of_extent
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*/
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#define XT_CMP(CMP, K, X, OFFSET64)\
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{\
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OFFSET64 = offsetXAD(X);\
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(CMP) = ((K) >= OFFSET64 + lengthXAD(X)) ? 1 :\
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((K) < OFFSET64) ? -1 : 0;\
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}
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/* write a xad entry */
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#define XT_PUTENTRY(XAD, FLAG, OFF, LEN, ADDR)\
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{\
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(XAD)->flag = (FLAG);\
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XADoffset((XAD), (OFF));\
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XADlength((XAD), (LEN));\
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XADaddress((XAD), (ADDR));\
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}
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#define XT_PAGE(IP, MP) BT_PAGE(IP, MP, xtpage_t, i_xtroot)
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/* get page buffer for specified block address */
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/* ToDo: Replace this ugly macro with a function */
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#define XT_GETPAGE(IP, BN, MP, SIZE, P, RC)\
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{\
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BT_GETPAGE(IP, BN, MP, xtpage_t, SIZE, P, RC, i_xtroot)\
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if (!(RC))\
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{\
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if ((le16_to_cpu((P)->header.nextindex) < XTENTRYSTART) ||\
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(le16_to_cpu((P)->header.nextindex) > le16_to_cpu((P)->header.maxentry)) ||\
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(le16_to_cpu((P)->header.maxentry) > (((BN)==0)?XTROOTMAXSLOT:PSIZE>>L2XTSLOTSIZE)))\
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{\
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jfs_error((IP)->i_sb, "XT_GETPAGE: xtree page corrupt");\
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BT_PUTPAGE(MP);\
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MP = NULL;\
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RC = -EIO;\
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}\
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}\
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}
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/* for consistency */
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#define XT_PUTPAGE(MP) BT_PUTPAGE(MP)
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#define XT_GETSEARCH(IP, LEAF, BN, MP, P, INDEX) \
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BT_GETSEARCH(IP, LEAF, BN, MP, xtpage_t, P, INDEX, i_xtroot)
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/* xtree entry parameter descriptor */
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struct xtsplit {
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struct metapage *mp;
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s16 index;
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u8 flag;
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s64 off;
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s64 addr;
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int len;
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struct pxdlist *pxdlist;
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};
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|
|
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/*
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* statistics
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*/
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#ifdef CONFIG_JFS_STATISTICS
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static struct {
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uint search;
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uint fastSearch;
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uint split;
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} xtStat;
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#endif
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/*
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* forward references
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*/
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static int xtSearch(struct inode *ip, s64 xoff, s64 *next, int *cmpp,
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struct btstack * btstack, int flag);
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static int xtSplitUp(tid_t tid,
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struct inode *ip,
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struct xtsplit * split, struct btstack * btstack);
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static int xtSplitPage(tid_t tid, struct inode *ip, struct xtsplit * split,
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struct metapage ** rmpp, s64 * rbnp);
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static int xtSplitRoot(tid_t tid, struct inode *ip,
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struct xtsplit * split, struct metapage ** rmpp);
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#ifdef _STILL_TO_PORT
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static int xtDeleteUp(tid_t tid, struct inode *ip, struct metapage * fmp,
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xtpage_t * fp, struct btstack * btstack);
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static int xtSearchNode(struct inode *ip,
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xad_t * xad,
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int *cmpp, struct btstack * btstack, int flag);
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static int xtRelink(tid_t tid, struct inode *ip, xtpage_t * fp);
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#endif /* _STILL_TO_PORT */
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/*
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* xtLookup()
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*
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* function: map a single page into a physical extent;
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*/
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int xtLookup(struct inode *ip, s64 lstart,
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s64 llen, int *pflag, s64 * paddr, s32 * plen, int no_check)
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{
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int rc = 0;
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struct btstack btstack;
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int cmp;
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s64 bn;
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struct metapage *mp;
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xtpage_t *p;
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int index;
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xad_t *xad;
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s64 next, size, xoff, xend;
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int xlen;
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s64 xaddr;
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*paddr = 0;
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*plen = llen;
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if (!no_check) {
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/* is lookup offset beyond eof ? */
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size = ((u64) ip->i_size + (JFS_SBI(ip->i_sb)->bsize - 1)) >>
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JFS_SBI(ip->i_sb)->l2bsize;
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if (lstart >= size) {
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jfs_err("xtLookup: lstart (0x%lx) >= size (0x%lx)",
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(ulong) lstart, (ulong) size);
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return 0;
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}
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}
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/*
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* search for the xad entry covering the logical extent
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*/
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//search:
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if ((rc = xtSearch(ip, lstart, &next, &cmp, &btstack, 0))) {
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jfs_err("xtLookup: xtSearch returned %d", rc);
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return rc;
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}
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/*
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* compute the physical extent covering logical extent
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*
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* N.B. search may have failed (e.g., hole in sparse file),
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* and returned the index of the next entry.
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*/
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/* retrieve search result */
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XT_GETSEARCH(ip, btstack.top, bn, mp, p, index);
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/* is xad found covering start of logical extent ?
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* lstart is a page start address,
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* i.e., lstart cannot start in a hole;
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*/
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if (cmp) {
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if (next)
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*plen = min(next - lstart, llen);
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goto out;
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}
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/*
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* lxd covered by xad
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*/
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xad = &p->xad[index];
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xoff = offsetXAD(xad);
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xlen = lengthXAD(xad);
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xend = xoff + xlen;
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xaddr = addressXAD(xad);
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/* initialize new pxd */
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*pflag = xad->flag;
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*paddr = xaddr + (lstart - xoff);
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/* a page must be fully covered by an xad */
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*plen = min(xend - lstart, llen);
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out:
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XT_PUTPAGE(mp);
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return rc;
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}
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/*
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* xtLookupList()
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*
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* function: map a single logical extent into a list of physical extent;
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*
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* parameter:
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* struct inode *ip,
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* struct lxdlist *lxdlist, lxd list (in)
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* struct xadlist *xadlist, xad list (in/out)
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* int flag)
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*
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* coverage of lxd by xad under assumption of
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* . lxd's are ordered and disjoint.
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* . xad's are ordered and disjoint.
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*
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* return:
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* 0: success
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*
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* note: a page being written (even a single byte) is backed fully,
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* except the last page which is only backed with blocks
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* required to cover the last byte;
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* the extent backing a page is fully contained within an xad;
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*/
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int xtLookupList(struct inode *ip, struct lxdlist * lxdlist,
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struct xadlist * xadlist, int flag)
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{
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int rc = 0;
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struct btstack btstack;
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int cmp;
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s64 bn;
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struct metapage *mp;
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xtpage_t *p;
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int index;
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lxd_t *lxd;
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xad_t *xad, *pxd;
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s64 size, lstart, lend, xstart, xend, pstart;
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s64 llen, xlen, plen;
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s64 xaddr, paddr;
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int nlxd, npxd, maxnpxd;
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npxd = xadlist->nxad = 0;
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maxnpxd = xadlist->maxnxad;
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pxd = xadlist->xad;
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nlxd = lxdlist->nlxd;
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lxd = lxdlist->lxd;
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lstart = offsetLXD(lxd);
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llen = lengthLXD(lxd);
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lend = lstart + llen;
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size = (ip->i_size + (JFS_SBI(ip->i_sb)->bsize - 1)) >>
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JFS_SBI(ip->i_sb)->l2bsize;
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/*
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* search for the xad entry covering the logical extent
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*/
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search:
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if (lstart >= size)
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return 0;
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|
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if ((rc = xtSearch(ip, lstart, NULL, &cmp, &btstack, 0)))
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return rc;
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|
/*
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* compute the physical extent covering logical extent
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*
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* N.B. search may have failed (e.g., hole in sparse file),
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* and returned the index of the next entry.
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*/
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//map:
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/* retrieve search result */
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XT_GETSEARCH(ip, btstack.top, bn, mp, p, index);
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/* is xad on the next sibling page ? */
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if (index == le16_to_cpu(p->header.nextindex)) {
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if (p->header.flag & BT_ROOT)
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goto mapend;
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if ((bn = le64_to_cpu(p->header.next)) == 0)
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goto mapend;
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XT_PUTPAGE(mp);
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|
|
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/* get next sibling page */
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XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
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if (rc)
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return rc;
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index = XTENTRYSTART;
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}
|
|
|
|
xad = &p->xad[index];
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|
|
/*
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* is lxd covered by xad ?
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*/
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compare:
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xstart = offsetXAD(xad);
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xlen = lengthXAD(xad);
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xend = xstart + xlen;
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xaddr = addressXAD(xad);
|
|
|
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compare1:
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if (xstart < lstart)
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goto compare2;
|
|
|
|
/* (lstart <= xstart) */
|
|
|
|
/* lxd is NOT covered by xad */
|
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if (lend <= xstart) {
|
|
/*
|
|
* get next lxd
|
|
*/
|
|
if (--nlxd == 0)
|
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goto mapend;
|
|
lxd++;
|
|
|
|
lstart = offsetLXD(lxd);
|
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llen = lengthLXD(lxd);
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lend = lstart + llen;
|
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if (lstart >= size)
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goto mapend;
|
|
|
|
/* compare with the current xad */
|
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goto compare1;
|
|
}
|
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/* lxd is covered by xad */
|
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else { /* (xstart < lend) */
|
|
|
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/* initialize new pxd */
|
|
pstart = xstart;
|
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plen = min(lend - xstart, xlen);
|
|
paddr = xaddr;
|
|
|
|
goto cover;
|
|
}
|
|
|
|
/* (xstart < lstart) */
|
|
compare2:
|
|
/* lxd is covered by xad */
|
|
if (lstart < xend) {
|
|
/* initialize new pxd */
|
|
pstart = lstart;
|
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plen = min(xend - lstart, llen);
|
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paddr = xaddr + (lstart - xstart);
|
|
|
|
goto cover;
|
|
}
|
|
/* lxd is NOT covered by xad */
|
|
else { /* (xend <= lstart) */
|
|
|
|
/*
|
|
* get next xad
|
|
*
|
|
* linear search next xad covering lxd on
|
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* the current xad page, and then tree search
|
|
*/
|
|
if (index == le16_to_cpu(p->header.nextindex) - 1) {
|
|
if (p->header.flag & BT_ROOT)
|
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goto mapend;
|
|
|
|
XT_PUTPAGE(mp);
|
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goto search;
|
|
} else {
|
|
index++;
|
|
xad++;
|
|
|
|
/* compare with new xad */
|
|
goto compare;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* lxd is covered by xad and a new pxd has been initialized
|
|
* (lstart <= xstart < lend) or (xstart < lstart < xend)
|
|
*/
|
|
cover:
|
|
/* finalize pxd corresponding to current xad */
|
|
XT_PUTENTRY(pxd, xad->flag, pstart, plen, paddr);
|
|
|
|
if (++npxd >= maxnpxd)
|
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goto mapend;
|
|
pxd++;
|
|
|
|
/*
|
|
* lxd is fully covered by xad
|
|
*/
|
|
if (lend <= xend) {
|
|
/*
|
|
* get next lxd
|
|
*/
|
|
if (--nlxd == 0)
|
|
goto mapend;
|
|
lxd++;
|
|
|
|
lstart = offsetLXD(lxd);
|
|
llen = lengthLXD(lxd);
|
|
lend = lstart + llen;
|
|
if (lstart >= size)
|
|
goto mapend;
|
|
|
|
/*
|
|
* test for old xad covering new lxd
|
|
* (old xstart < new lstart)
|
|
*/
|
|
goto compare2;
|
|
}
|
|
/*
|
|
* lxd is partially covered by xad
|
|
*/
|
|
else { /* (xend < lend) */
|
|
|
|
/*
|
|
* get next xad
|
|
*
|
|
* linear search next xad covering lxd on
|
|
* the current xad page, and then next xad page search
|
|
*/
|
|
if (index == le16_to_cpu(p->header.nextindex) - 1) {
|
|
if (p->header.flag & BT_ROOT)
|
|
goto mapend;
|
|
|
|
if ((bn = le64_to_cpu(p->header.next)) == 0)
|
|
goto mapend;
|
|
|
|
XT_PUTPAGE(mp);
|
|
|
|
/* get next sibling page */
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
index = XTENTRYSTART;
|
|
xad = &p->xad[index];
|
|
} else {
|
|
index++;
|
|
xad++;
|
|
}
|
|
|
|
/*
|
|
* test for new xad covering old lxd
|
|
* (old lstart < new xstart)
|
|
*/
|
|
goto compare;
|
|
}
|
|
|
|
mapend:
|
|
xadlist->nxad = npxd;
|
|
|
|
//out:
|
|
XT_PUTPAGE(mp);
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
/*
|
|
* xtSearch()
|
|
*
|
|
* function: search for the xad entry covering specified offset.
|
|
*
|
|
* parameters:
|
|
* ip - file object;
|
|
* xoff - extent offset;
|
|
* nextp - address of next extent (if any) for search miss
|
|
* cmpp - comparison result:
|
|
* btstack - traverse stack;
|
|
* flag - search process flag (XT_INSERT);
|
|
*
|
|
* returns:
|
|
* btstack contains (bn, index) of search path traversed to the entry.
|
|
* *cmpp is set to result of comparison with the entry returned.
|
|
* the page containing the entry is pinned at exit.
|
|
*/
|
|
static int xtSearch(struct inode *ip, s64 xoff, s64 *nextp,
|
|
int *cmpp, struct btstack * btstack, int flag)
|
|
{
|
|
struct jfs_inode_info *jfs_ip = JFS_IP(ip);
|
|
int rc = 0;
|
|
int cmp = 1; /* init for empty page */
|
|
s64 bn; /* block number */
|
|
struct metapage *mp; /* page buffer */
|
|
xtpage_t *p; /* page */
|
|
xad_t *xad;
|
|
int base, index, lim, btindex;
|
|
struct btframe *btsp;
|
|
int nsplit = 0; /* number of pages to split */
|
|
s64 t64;
|
|
s64 next = 0;
|
|
|
|
INCREMENT(xtStat.search);
|
|
|
|
BT_CLR(btstack);
|
|
|
|
btstack->nsplit = 0;
|
|
|
|
/*
|
|
* search down tree from root:
|
|
*
|
|
* between two consecutive entries of <Ki, Pi> and <Kj, Pj> of
|
|
* internal page, child page Pi contains entry with k, Ki <= K < Kj.
|
|
*
|
|
* if entry with search key K is not found
|
|
* internal page search find the entry with largest key Ki
|
|
* less than K which point to the child page to search;
|
|
* leaf page search find the entry with smallest key Kj
|
|
* greater than K so that the returned index is the position of
|
|
* the entry to be shifted right for insertion of new entry.
|
|
* for empty tree, search key is greater than any key of the tree.
|
|
*
|
|
* by convention, root bn = 0.
|
|
*/
|
|
for (bn = 0;;) {
|
|
/* get/pin the page to search */
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* try sequential access heuristics with the previous
|
|
* access entry in target leaf page:
|
|
* once search narrowed down into the target leaf,
|
|
* key must either match an entry in the leaf or
|
|
* key entry does not exist in the tree;
|
|
*/
|
|
//fastSearch:
|
|
if ((jfs_ip->btorder & BT_SEQUENTIAL) &&
|
|
(p->header.flag & BT_LEAF) &&
|
|
(index = jfs_ip->btindex) <
|
|
le16_to_cpu(p->header.nextindex)) {
|
|
xad = &p->xad[index];
|
|
t64 = offsetXAD(xad);
|
|
if (xoff < t64 + lengthXAD(xad)) {
|
|
if (xoff >= t64) {
|
|
*cmpp = 0;
|
|
goto out;
|
|
}
|
|
|
|
/* stop sequential access heuristics */
|
|
goto binarySearch;
|
|
} else { /* (t64 + lengthXAD(xad)) <= xoff */
|
|
|
|
/* try next sequential entry */
|
|
index++;
|
|
if (index <
|
|
le16_to_cpu(p->header.nextindex)) {
|
|
xad++;
|
|
t64 = offsetXAD(xad);
|
|
if (xoff < t64 + lengthXAD(xad)) {
|
|
if (xoff >= t64) {
|
|
*cmpp = 0;
|
|
goto out;
|
|
}
|
|
|
|
/* miss: key falls between
|
|
* previous and this entry
|
|
*/
|
|
*cmpp = 1;
|
|
next = t64;
|
|
goto out;
|
|
}
|
|
|
|
/* (xoff >= t64 + lengthXAD(xad));
|
|
* matching entry may be further out:
|
|
* stop heuristic search
|
|
*/
|
|
/* stop sequential access heuristics */
|
|
goto binarySearch;
|
|
}
|
|
|
|
/* (index == p->header.nextindex);
|
|
* miss: key entry does not exist in
|
|
* the target leaf/tree
|
|
*/
|
|
*cmpp = 1;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* if hit, return index of the entry found, and
|
|
* if miss, where new entry with search key is
|
|
* to be inserted;
|
|
*/
|
|
out:
|
|
/* compute number of pages to split */
|
|
if (flag & XT_INSERT) {
|
|
if (p->header.nextindex == /* little-endian */
|
|
p->header.maxentry)
|
|
nsplit++;
|
|
else
|
|
nsplit = 0;
|
|
btstack->nsplit = nsplit;
|
|
}
|
|
|
|
/* save search result */
|
|
btsp = btstack->top;
|
|
btsp->bn = bn;
|
|
btsp->index = index;
|
|
btsp->mp = mp;
|
|
|
|
/* update sequential access heuristics */
|
|
jfs_ip->btindex = index;
|
|
|
|
if (nextp)
|
|
*nextp = next;
|
|
|
|
INCREMENT(xtStat.fastSearch);
|
|
return 0;
|
|
}
|
|
|
|
/* well, ... full search now */
|
|
binarySearch:
|
|
lim = le16_to_cpu(p->header.nextindex) - XTENTRYSTART;
|
|
|
|
/*
|
|
* binary search with search key K on the current page
|
|
*/
|
|
for (base = XTENTRYSTART; lim; lim >>= 1) {
|
|
index = base + (lim >> 1);
|
|
|
|
XT_CMP(cmp, xoff, &p->xad[index], t64);
|
|
if (cmp == 0) {
|
|
/*
|
|
* search hit
|
|
*/
|
|
/* search hit - leaf page:
|
|
* return the entry found
|
|
*/
|
|
if (p->header.flag & BT_LEAF) {
|
|
*cmpp = cmp;
|
|
|
|
/* compute number of pages to split */
|
|
if (flag & XT_INSERT) {
|
|
if (p->header.nextindex ==
|
|
p->header.maxentry)
|
|
nsplit++;
|
|
else
|
|
nsplit = 0;
|
|
btstack->nsplit = nsplit;
|
|
}
|
|
|
|
/* save search result */
|
|
btsp = btstack->top;
|
|
btsp->bn = bn;
|
|
btsp->index = index;
|
|
btsp->mp = mp;
|
|
|
|
/* init sequential access heuristics */
|
|
btindex = jfs_ip->btindex;
|
|
if (index == btindex ||
|
|
index == btindex + 1)
|
|
jfs_ip->btorder = BT_SEQUENTIAL;
|
|
else
|
|
jfs_ip->btorder = BT_RANDOM;
|
|
jfs_ip->btindex = index;
|
|
|
|
return 0;
|
|
}
|
|
/* search hit - internal page:
|
|
* descend/search its child page
|
|
*/
|
|
if (index < le16_to_cpu(p->header.nextindex)-1)
|
|
next = offsetXAD(&p->xad[index + 1]);
|
|
goto next;
|
|
}
|
|
|
|
if (cmp > 0) {
|
|
base = index + 1;
|
|
--lim;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* search miss
|
|
*
|
|
* base is the smallest index with key (Kj) greater than
|
|
* search key (K) and may be zero or maxentry index.
|
|
*/
|
|
if (base < le16_to_cpu(p->header.nextindex))
|
|
next = offsetXAD(&p->xad[base]);
|
|
/*
|
|
* search miss - leaf page:
|
|
*
|
|
* return location of entry (base) where new entry with
|
|
* search key K is to be inserted.
|
|
*/
|
|
if (p->header.flag & BT_LEAF) {
|
|
*cmpp = cmp;
|
|
|
|
/* compute number of pages to split */
|
|
if (flag & XT_INSERT) {
|
|
if (p->header.nextindex ==
|
|
p->header.maxentry)
|
|
nsplit++;
|
|
else
|
|
nsplit = 0;
|
|
btstack->nsplit = nsplit;
|
|
}
|
|
|
|
/* save search result */
|
|
btsp = btstack->top;
|
|
btsp->bn = bn;
|
|
btsp->index = base;
|
|
btsp->mp = mp;
|
|
|
|
/* init sequential access heuristics */
|
|
btindex = jfs_ip->btindex;
|
|
if (base == btindex || base == btindex + 1)
|
|
jfs_ip->btorder = BT_SEQUENTIAL;
|
|
else
|
|
jfs_ip->btorder = BT_RANDOM;
|
|
jfs_ip->btindex = base;
|
|
|
|
if (nextp)
|
|
*nextp = next;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* search miss - non-leaf page:
|
|
*
|
|
* if base is non-zero, decrement base by one to get the parent
|
|
* entry of the child page to search.
|
|
*/
|
|
index = base ? base - 1 : base;
|
|
|
|
/*
|
|
* go down to child page
|
|
*/
|
|
next:
|
|
/* update number of pages to split */
|
|
if (p->header.nextindex == p->header.maxentry)
|
|
nsplit++;
|
|
else
|
|
nsplit = 0;
|
|
|
|
/* push (bn, index) of the parent page/entry */
|
|
BT_PUSH(btstack, bn, index);
|
|
|
|
/* get the child page block number */
|
|
bn = addressXAD(&p->xad[index]);
|
|
|
|
/* unpin the parent page */
|
|
XT_PUTPAGE(mp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* xtInsert()
|
|
*
|
|
* function:
|
|
*
|
|
* parameter:
|
|
* tid - transaction id;
|
|
* ip - file object;
|
|
* xflag - extent flag (XAD_NOTRECORDED):
|
|
* xoff - extent offset;
|
|
* xlen - extent length;
|
|
* xaddrp - extent address pointer (in/out):
|
|
* if (*xaddrp)
|
|
* caller allocated data extent at *xaddrp;
|
|
* else
|
|
* allocate data extent and return its xaddr;
|
|
* flag -
|
|
*
|
|
* return:
|
|
*/
|
|
int xtInsert(tid_t tid, /* transaction id */
|
|
struct inode *ip, int xflag, s64 xoff, s32 xlen, s64 * xaddrp,
|
|
int flag)
|
|
{
|
|
int rc = 0;
|
|
s64 xaddr, hint;
|
|
struct metapage *mp; /* meta-page buffer */
|
|
xtpage_t *p; /* base B+-tree index page */
|
|
s64 bn;
|
|
int index, nextindex;
|
|
struct btstack btstack; /* traverse stack */
|
|
struct xtsplit split; /* split information */
|
|
xad_t *xad;
|
|
int cmp;
|
|
s64 next;
|
|
struct tlock *tlck;
|
|
struct xtlock *xtlck;
|
|
|
|
jfs_info("xtInsert: nxoff:0x%lx nxlen:0x%x", (ulong) xoff, xlen);
|
|
|
|
/*
|
|
* search for the entry location at which to insert:
|
|
*
|
|
* xtFastSearch() and xtSearch() both returns (leaf page
|
|
* pinned, index at which to insert).
|
|
* n.b. xtSearch() may return index of maxentry of
|
|
* the full page.
|
|
*/
|
|
if ((rc = xtSearch(ip, xoff, &next, &cmp, &btstack, XT_INSERT)))
|
|
return rc;
|
|
|
|
/* retrieve search result */
|
|
XT_GETSEARCH(ip, btstack.top, bn, mp, p, index);
|
|
|
|
/* This test must follow XT_GETSEARCH since mp must be valid if
|
|
* we branch to out: */
|
|
if ((cmp == 0) || (next && (xlen > next - xoff))) {
|
|
rc = -EEXIST;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* allocate data extent requested
|
|
*
|
|
* allocation hint: last xad
|
|
*/
|
|
if ((xaddr = *xaddrp) == 0) {
|
|
if (index > XTENTRYSTART) {
|
|
xad = &p->xad[index - 1];
|
|
hint = addressXAD(xad) + lengthXAD(xad) - 1;
|
|
} else
|
|
hint = 0;
|
|
if ((rc = DQUOT_ALLOC_BLOCK(ip, xlen)))
|
|
goto out;
|
|
if ((rc = dbAlloc(ip, hint, (s64) xlen, &xaddr))) {
|
|
DQUOT_FREE_BLOCK(ip, xlen);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* insert entry for new extent
|
|
*/
|
|
xflag |= XAD_NEW;
|
|
|
|
/*
|
|
* if the leaf page is full, split the page and
|
|
* propagate up the router entry for the new page from split
|
|
*
|
|
* The xtSplitUp() will insert the entry and unpin the leaf page.
|
|
*/
|
|
nextindex = le16_to_cpu(p->header.nextindex);
|
|
if (nextindex == le16_to_cpu(p->header.maxentry)) {
|
|
split.mp = mp;
|
|
split.index = index;
|
|
split.flag = xflag;
|
|
split.off = xoff;
|
|
split.len = xlen;
|
|
split.addr = xaddr;
|
|
split.pxdlist = NULL;
|
|
if ((rc = xtSplitUp(tid, ip, &split, &btstack))) {
|
|
/* undo data extent allocation */
|
|
if (*xaddrp == 0) {
|
|
dbFree(ip, xaddr, (s64) xlen);
|
|
DQUOT_FREE_BLOCK(ip, xlen);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
*xaddrp = xaddr;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* insert the new entry into the leaf page
|
|
*/
|
|
/*
|
|
* acquire a transaction lock on the leaf page;
|
|
*
|
|
* action: xad insertion/extension;
|
|
*/
|
|
BT_MARK_DIRTY(mp, ip);
|
|
|
|
/* if insert into middle, shift right remaining entries. */
|
|
if (index < nextindex)
|
|
memmove(&p->xad[index + 1], &p->xad[index],
|
|
(nextindex - index) * sizeof(xad_t));
|
|
|
|
/* insert the new entry: mark the entry NEW */
|
|
xad = &p->xad[index];
|
|
XT_PUTENTRY(xad, xflag, xoff, xlen, xaddr);
|
|
|
|
/* advance next available entry index */
|
|
p->header.nextindex =
|
|
cpu_to_le16(le16_to_cpu(p->header.nextindex) + 1);
|
|
|
|
/* Don't log it if there are no links to the file */
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
tlck = txLock(tid, ip, mp, tlckXTREE | tlckGROW);
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
xtlck->lwm.offset =
|
|
(xtlck->lwm.offset) ? min(index,
|
|
(int)xtlck->lwm.offset) : index;
|
|
xtlck->lwm.length =
|
|
le16_to_cpu(p->header.nextindex) - xtlck->lwm.offset;
|
|
}
|
|
|
|
*xaddrp = xaddr;
|
|
|
|
out:
|
|
/* unpin the leaf page */
|
|
XT_PUTPAGE(mp);
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
/*
|
|
* xtSplitUp()
|
|
*
|
|
* function:
|
|
* split full pages as propagating insertion up the tree
|
|
*
|
|
* parameter:
|
|
* tid - transaction id;
|
|
* ip - file object;
|
|
* split - entry parameter descriptor;
|
|
* btstack - traverse stack from xtSearch()
|
|
*
|
|
* return:
|
|
*/
|
|
static int
|
|
xtSplitUp(tid_t tid,
|
|
struct inode *ip, struct xtsplit * split, struct btstack * btstack)
|
|
{
|
|
int rc = 0;
|
|
struct metapage *smp;
|
|
xtpage_t *sp; /* split page */
|
|
struct metapage *rmp;
|
|
s64 rbn; /* new right page block number */
|
|
struct metapage *rcmp;
|
|
xtpage_t *rcp; /* right child page */
|
|
s64 rcbn; /* right child page block number */
|
|
int skip; /* index of entry of insertion */
|
|
int nextindex; /* next available entry index of p */
|
|
struct btframe *parent; /* parent page entry on traverse stack */
|
|
xad_t *xad;
|
|
s64 xaddr;
|
|
int xlen;
|
|
int nsplit; /* number of pages split */
|
|
struct pxdlist pxdlist;
|
|
pxd_t *pxd;
|
|
struct tlock *tlck;
|
|
struct xtlock *xtlck;
|
|
|
|
smp = split->mp;
|
|
sp = XT_PAGE(ip, smp);
|
|
|
|
/* is inode xtree root extension/inline EA area free ? */
|
|
if ((sp->header.flag & BT_ROOT) && (!S_ISDIR(ip->i_mode)) &&
|
|
(le16_to_cpu(sp->header.maxentry) < XTROOTMAXSLOT) &&
|
|
(JFS_IP(ip)->mode2 & INLINEEA)) {
|
|
sp->header.maxentry = cpu_to_le16(XTROOTMAXSLOT);
|
|
JFS_IP(ip)->mode2 &= ~INLINEEA;
|
|
|
|
BT_MARK_DIRTY(smp, ip);
|
|
/*
|
|
* acquire a transaction lock on the leaf page;
|
|
*
|
|
* action: xad insertion/extension;
|
|
*/
|
|
|
|
/* if insert into middle, shift right remaining entries. */
|
|
skip = split->index;
|
|
nextindex = le16_to_cpu(sp->header.nextindex);
|
|
if (skip < nextindex)
|
|
memmove(&sp->xad[skip + 1], &sp->xad[skip],
|
|
(nextindex - skip) * sizeof(xad_t));
|
|
|
|
/* insert the new entry: mark the entry NEW */
|
|
xad = &sp->xad[skip];
|
|
XT_PUTENTRY(xad, split->flag, split->off, split->len,
|
|
split->addr);
|
|
|
|
/* advance next available entry index */
|
|
sp->header.nextindex =
|
|
cpu_to_le16(le16_to_cpu(sp->header.nextindex) + 1);
|
|
|
|
/* Don't log it if there are no links to the file */
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
tlck = txLock(tid, ip, smp, tlckXTREE | tlckGROW);
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
xtlck->lwm.offset = (xtlck->lwm.offset) ?
|
|
min(skip, (int)xtlck->lwm.offset) : skip;
|
|
xtlck->lwm.length =
|
|
le16_to_cpu(sp->header.nextindex) -
|
|
xtlck->lwm.offset;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* allocate new index blocks to cover index page split(s)
|
|
*
|
|
* allocation hint: ?
|
|
*/
|
|
if (split->pxdlist == NULL) {
|
|
nsplit = btstack->nsplit;
|
|
split->pxdlist = &pxdlist;
|
|
pxdlist.maxnpxd = pxdlist.npxd = 0;
|
|
pxd = &pxdlist.pxd[0];
|
|
xlen = JFS_SBI(ip->i_sb)->nbperpage;
|
|
for (; nsplit > 0; nsplit--, pxd++) {
|
|
if ((rc = dbAlloc(ip, (s64) 0, (s64) xlen, &xaddr))
|
|
== 0) {
|
|
PXDaddress(pxd, xaddr);
|
|
PXDlength(pxd, xlen);
|
|
|
|
pxdlist.maxnpxd++;
|
|
|
|
continue;
|
|
}
|
|
|
|
/* undo allocation */
|
|
|
|
XT_PUTPAGE(smp);
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Split leaf page <sp> into <sp> and a new right page <rp>.
|
|
*
|
|
* The split routines insert the new entry into the leaf page,
|
|
* and acquire txLock as appropriate.
|
|
* return <rp> pinned and its block number <rpbn>.
|
|
*/
|
|
rc = (sp->header.flag & BT_ROOT) ?
|
|
xtSplitRoot(tid, ip, split, &rmp) :
|
|
xtSplitPage(tid, ip, split, &rmp, &rbn);
|
|
|
|
XT_PUTPAGE(smp);
|
|
|
|
if (rc)
|
|
return -EIO;
|
|
/*
|
|
* propagate up the router entry for the leaf page just split
|
|
*
|
|
* insert a router entry for the new page into the parent page,
|
|
* propagate the insert/split up the tree by walking back the stack
|
|
* of (bn of parent page, index of child page entry in parent page)
|
|
* that were traversed during the search for the page that split.
|
|
*
|
|
* the propagation of insert/split up the tree stops if the root
|
|
* splits or the page inserted into doesn't have to split to hold
|
|
* the new entry.
|
|
*
|
|
* the parent entry for the split page remains the same, and
|
|
* a new entry is inserted at its right with the first key and
|
|
* block number of the new right page.
|
|
*
|
|
* There are a maximum of 3 pages pinned at any time:
|
|
* right child, left parent and right parent (when the parent splits)
|
|
* to keep the child page pinned while working on the parent.
|
|
* make sure that all pins are released at exit.
|
|
*/
|
|
while ((parent = BT_POP(btstack)) != NULL) {
|
|
/* parent page specified by stack frame <parent> */
|
|
|
|
/* keep current child pages <rcp> pinned */
|
|
rcmp = rmp;
|
|
rcbn = rbn;
|
|
rcp = XT_PAGE(ip, rcmp);
|
|
|
|
/*
|
|
* insert router entry in parent for new right child page <rp>
|
|
*/
|
|
/* get/pin the parent page <sp> */
|
|
XT_GETPAGE(ip, parent->bn, smp, PSIZE, sp, rc);
|
|
if (rc) {
|
|
XT_PUTPAGE(rcmp);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* The new key entry goes ONE AFTER the index of parent entry,
|
|
* because the split was to the right.
|
|
*/
|
|
skip = parent->index + 1;
|
|
|
|
/*
|
|
* split or shift right remaining entries of the parent page
|
|
*/
|
|
nextindex = le16_to_cpu(sp->header.nextindex);
|
|
/*
|
|
* parent page is full - split the parent page
|
|
*/
|
|
if (nextindex == le16_to_cpu(sp->header.maxentry)) {
|
|
/* init for parent page split */
|
|
split->mp = smp;
|
|
split->index = skip; /* index at insert */
|
|
split->flag = XAD_NEW;
|
|
split->off = offsetXAD(&rcp->xad[XTENTRYSTART]);
|
|
split->len = JFS_SBI(ip->i_sb)->nbperpage;
|
|
split->addr = rcbn;
|
|
|
|
/* unpin previous right child page */
|
|
XT_PUTPAGE(rcmp);
|
|
|
|
/* The split routines insert the new entry,
|
|
* and acquire txLock as appropriate.
|
|
* return <rp> pinned and its block number <rpbn>.
|
|
*/
|
|
rc = (sp->header.flag & BT_ROOT) ?
|
|
xtSplitRoot(tid, ip, split, &rmp) :
|
|
xtSplitPage(tid, ip, split, &rmp, &rbn);
|
|
if (rc) {
|
|
XT_PUTPAGE(smp);
|
|
return rc;
|
|
}
|
|
|
|
XT_PUTPAGE(smp);
|
|
/* keep new child page <rp> pinned */
|
|
}
|
|
/*
|
|
* parent page is not full - insert in parent page
|
|
*/
|
|
else {
|
|
/*
|
|
* insert router entry in parent for the right child
|
|
* page from the first entry of the right child page:
|
|
*/
|
|
/*
|
|
* acquire a transaction lock on the parent page;
|
|
*
|
|
* action: router xad insertion;
|
|
*/
|
|
BT_MARK_DIRTY(smp, ip);
|
|
|
|
/*
|
|
* if insert into middle, shift right remaining entries
|
|
*/
|
|
if (skip < nextindex)
|
|
memmove(&sp->xad[skip + 1], &sp->xad[skip],
|
|
(nextindex -
|
|
skip) << L2XTSLOTSIZE);
|
|
|
|
/* insert the router entry */
|
|
xad = &sp->xad[skip];
|
|
XT_PUTENTRY(xad, XAD_NEW,
|
|
offsetXAD(&rcp->xad[XTENTRYSTART]),
|
|
JFS_SBI(ip->i_sb)->nbperpage, rcbn);
|
|
|
|
/* advance next available entry index. */
|
|
sp->header.nextindex =
|
|
cpu_to_le16(le16_to_cpu(sp->header.nextindex) +
|
|
1);
|
|
|
|
/* Don't log it if there are no links to the file */
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
tlck = txLock(tid, ip, smp,
|
|
tlckXTREE | tlckGROW);
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
xtlck->lwm.offset = (xtlck->lwm.offset) ?
|
|
min(skip, (int)xtlck->lwm.offset) : skip;
|
|
xtlck->lwm.length =
|
|
le16_to_cpu(sp->header.nextindex) -
|
|
xtlck->lwm.offset;
|
|
}
|
|
|
|
/* unpin parent page */
|
|
XT_PUTPAGE(smp);
|
|
|
|
/* exit propagate up */
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* unpin current right page */
|
|
XT_PUTPAGE(rmp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* xtSplitPage()
|
|
*
|
|
* function:
|
|
* split a full non-root page into
|
|
* original/split/left page and new right page
|
|
* i.e., the original/split page remains as left page.
|
|
*
|
|
* parameter:
|
|
* int tid,
|
|
* struct inode *ip,
|
|
* struct xtsplit *split,
|
|
* struct metapage **rmpp,
|
|
* u64 *rbnp,
|
|
*
|
|
* return:
|
|
* Pointer to page in which to insert or NULL on error.
|
|
*/
|
|
static int
|
|
xtSplitPage(tid_t tid, struct inode *ip,
|
|
struct xtsplit * split, struct metapage ** rmpp, s64 * rbnp)
|
|
{
|
|
int rc = 0;
|
|
struct metapage *smp;
|
|
xtpage_t *sp;
|
|
struct metapage *rmp;
|
|
xtpage_t *rp; /* new right page allocated */
|
|
s64 rbn; /* new right page block number */
|
|
struct metapage *mp;
|
|
xtpage_t *p;
|
|
s64 nextbn;
|
|
int skip, maxentry, middle, righthalf, n;
|
|
xad_t *xad;
|
|
struct pxdlist *pxdlist;
|
|
pxd_t *pxd;
|
|
struct tlock *tlck;
|
|
struct xtlock *sxtlck = NULL, *rxtlck = NULL;
|
|
int quota_allocation = 0;
|
|
|
|
smp = split->mp;
|
|
sp = XT_PAGE(ip, smp);
|
|
|
|
INCREMENT(xtStat.split);
|
|
|
|
pxdlist = split->pxdlist;
|
|
pxd = &pxdlist->pxd[pxdlist->npxd];
|
|
pxdlist->npxd++;
|
|
rbn = addressPXD(pxd);
|
|
|
|
/* Allocate blocks to quota. */
|
|
if (DQUOT_ALLOC_BLOCK(ip, lengthPXD(pxd))) {
|
|
rc = -EDQUOT;
|
|
goto clean_up;
|
|
}
|
|
|
|
quota_allocation += lengthPXD(pxd);
|
|
|
|
/*
|
|
* allocate the new right page for the split
|
|
*/
|
|
rmp = get_metapage(ip, rbn, PSIZE, 1);
|
|
if (rmp == NULL) {
|
|
rc = -EIO;
|
|
goto clean_up;
|
|
}
|
|
|
|
jfs_info("xtSplitPage: ip:0x%p smp:0x%p rmp:0x%p", ip, smp, rmp);
|
|
|
|
BT_MARK_DIRTY(rmp, ip);
|
|
/*
|
|
* action: new page;
|
|
*/
|
|
|
|
rp = (xtpage_t *) rmp->data;
|
|
rp->header.self = *pxd;
|
|
rp->header.flag = sp->header.flag & BT_TYPE;
|
|
rp->header.maxentry = sp->header.maxentry; /* little-endian */
|
|
rp->header.nextindex = cpu_to_le16(XTENTRYSTART);
|
|
|
|
BT_MARK_DIRTY(smp, ip);
|
|
/* Don't log it if there are no links to the file */
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
/*
|
|
* acquire a transaction lock on the new right page;
|
|
*/
|
|
tlck = txLock(tid, ip, rmp, tlckXTREE | tlckNEW);
|
|
rxtlck = (struct xtlock *) & tlck->lock;
|
|
rxtlck->lwm.offset = XTENTRYSTART;
|
|
/*
|
|
* acquire a transaction lock on the split page
|
|
*/
|
|
tlck = txLock(tid, ip, smp, tlckXTREE | tlckGROW);
|
|
sxtlck = (struct xtlock *) & tlck->lock;
|
|
}
|
|
|
|
/*
|
|
* initialize/update sibling pointers of <sp> and <rp>
|
|
*/
|
|
nextbn = le64_to_cpu(sp->header.next);
|
|
rp->header.next = cpu_to_le64(nextbn);
|
|
rp->header.prev = cpu_to_le64(addressPXD(&sp->header.self));
|
|
sp->header.next = cpu_to_le64(rbn);
|
|
|
|
skip = split->index;
|
|
|
|
/*
|
|
* sequential append at tail (after last entry of last page)
|
|
*
|
|
* if splitting the last page on a level because of appending
|
|
* a entry to it (skip is maxentry), it's likely that the access is
|
|
* sequential. adding an empty page on the side of the level is less
|
|
* work and can push the fill factor much higher than normal.
|
|
* if we're wrong it's no big deal - we will do the split the right
|
|
* way next time.
|
|
* (it may look like it's equally easy to do a similar hack for
|
|
* reverse sorted data, that is, split the tree left, but it's not.
|
|
* Be my guest.)
|
|
*/
|
|
if (nextbn == 0 && skip == le16_to_cpu(sp->header.maxentry)) {
|
|
/*
|
|
* acquire a transaction lock on the new/right page;
|
|
*
|
|
* action: xad insertion;
|
|
*/
|
|
/* insert entry at the first entry of the new right page */
|
|
xad = &rp->xad[XTENTRYSTART];
|
|
XT_PUTENTRY(xad, split->flag, split->off, split->len,
|
|
split->addr);
|
|
|
|
rp->header.nextindex = cpu_to_le16(XTENTRYSTART + 1);
|
|
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
/* rxtlck->lwm.offset = XTENTRYSTART; */
|
|
rxtlck->lwm.length = 1;
|
|
}
|
|
|
|
*rmpp = rmp;
|
|
*rbnp = rbn;
|
|
|
|
jfs_info("xtSplitPage: sp:0x%p rp:0x%p", sp, rp);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* non-sequential insert (at possibly middle page)
|
|
*/
|
|
|
|
/*
|
|
* update previous pointer of old next/right page of <sp>
|
|
*/
|
|
if (nextbn != 0) {
|
|
XT_GETPAGE(ip, nextbn, mp, PSIZE, p, rc);
|
|
if (rc) {
|
|
XT_PUTPAGE(rmp);
|
|
goto clean_up;
|
|
}
|
|
|
|
BT_MARK_DIRTY(mp, ip);
|
|
/*
|
|
* acquire a transaction lock on the next page;
|
|
*
|
|
* action:sibling pointer update;
|
|
*/
|
|
if (!test_cflag(COMMIT_Nolink, ip))
|
|
tlck = txLock(tid, ip, mp, tlckXTREE | tlckRELINK);
|
|
|
|
p->header.prev = cpu_to_le64(rbn);
|
|
|
|
/* sibling page may have been updated previously, or
|
|
* it may be updated later;
|
|
*/
|
|
|
|
XT_PUTPAGE(mp);
|
|
}
|
|
|
|
/*
|
|
* split the data between the split and new/right pages
|
|
*/
|
|
maxentry = le16_to_cpu(sp->header.maxentry);
|
|
middle = maxentry >> 1;
|
|
righthalf = maxentry - middle;
|
|
|
|
/*
|
|
* skip index in old split/left page - insert into left page:
|
|
*/
|
|
if (skip <= middle) {
|
|
/* move right half of split page to the new right page */
|
|
memmove(&rp->xad[XTENTRYSTART], &sp->xad[middle],
|
|
righthalf << L2XTSLOTSIZE);
|
|
|
|
/* shift right tail of left half to make room for new entry */
|
|
if (skip < middle)
|
|
memmove(&sp->xad[skip + 1], &sp->xad[skip],
|
|
(middle - skip) << L2XTSLOTSIZE);
|
|
|
|
/* insert new entry */
|
|
xad = &sp->xad[skip];
|
|
XT_PUTENTRY(xad, split->flag, split->off, split->len,
|
|
split->addr);
|
|
|
|
/* update page header */
|
|
sp->header.nextindex = cpu_to_le16(middle + 1);
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
sxtlck->lwm.offset = (sxtlck->lwm.offset) ?
|
|
min(skip, (int)sxtlck->lwm.offset) : skip;
|
|
}
|
|
|
|
rp->header.nextindex =
|
|
cpu_to_le16(XTENTRYSTART + righthalf);
|
|
}
|
|
/*
|
|
* skip index in new right page - insert into right page:
|
|
*/
|
|
else {
|
|
/* move left head of right half to right page */
|
|
n = skip - middle;
|
|
memmove(&rp->xad[XTENTRYSTART], &sp->xad[middle],
|
|
n << L2XTSLOTSIZE);
|
|
|
|
/* insert new entry */
|
|
n += XTENTRYSTART;
|
|
xad = &rp->xad[n];
|
|
XT_PUTENTRY(xad, split->flag, split->off, split->len,
|
|
split->addr);
|
|
|
|
/* move right tail of right half to right page */
|
|
if (skip < maxentry)
|
|
memmove(&rp->xad[n + 1], &sp->xad[skip],
|
|
(maxentry - skip) << L2XTSLOTSIZE);
|
|
|
|
/* update page header */
|
|
sp->header.nextindex = cpu_to_le16(middle);
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
sxtlck->lwm.offset = (sxtlck->lwm.offset) ?
|
|
min(middle, (int)sxtlck->lwm.offset) : middle;
|
|
}
|
|
|
|
rp->header.nextindex = cpu_to_le16(XTENTRYSTART +
|
|
righthalf + 1);
|
|
}
|
|
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
sxtlck->lwm.length = le16_to_cpu(sp->header.nextindex) -
|
|
sxtlck->lwm.offset;
|
|
|
|
/* rxtlck->lwm.offset = XTENTRYSTART; */
|
|
rxtlck->lwm.length = le16_to_cpu(rp->header.nextindex) -
|
|
XTENTRYSTART;
|
|
}
|
|
|
|
*rmpp = rmp;
|
|
*rbnp = rbn;
|
|
|
|
jfs_info("xtSplitPage: sp:0x%p rp:0x%p", sp, rp);
|
|
return rc;
|
|
|
|
clean_up:
|
|
|
|
/* Rollback quota allocation. */
|
|
if (quota_allocation)
|
|
DQUOT_FREE_BLOCK(ip, quota_allocation);
|
|
|
|
return (rc);
|
|
}
|
|
|
|
|
|
/*
|
|
* xtSplitRoot()
|
|
*
|
|
* function:
|
|
* split the full root page into
|
|
* original/root/split page and new right page
|
|
* i.e., root remains fixed in tree anchor (inode) and
|
|
* the root is copied to a single new right child page
|
|
* since root page << non-root page, and
|
|
* the split root page contains a single entry for the
|
|
* new right child page.
|
|
*
|
|
* parameter:
|
|
* int tid,
|
|
* struct inode *ip,
|
|
* struct xtsplit *split,
|
|
* struct metapage **rmpp)
|
|
*
|
|
* return:
|
|
* Pointer to page in which to insert or NULL on error.
|
|
*/
|
|
static int
|
|
xtSplitRoot(tid_t tid,
|
|
struct inode *ip, struct xtsplit * split, struct metapage ** rmpp)
|
|
{
|
|
xtpage_t *sp;
|
|
struct metapage *rmp;
|
|
xtpage_t *rp;
|
|
s64 rbn;
|
|
int skip, nextindex;
|
|
xad_t *xad;
|
|
pxd_t *pxd;
|
|
struct pxdlist *pxdlist;
|
|
struct tlock *tlck;
|
|
struct xtlock *xtlck;
|
|
|
|
sp = &JFS_IP(ip)->i_xtroot;
|
|
|
|
INCREMENT(xtStat.split);
|
|
|
|
/*
|
|
* allocate a single (right) child page
|
|
*/
|
|
pxdlist = split->pxdlist;
|
|
pxd = &pxdlist->pxd[pxdlist->npxd];
|
|
pxdlist->npxd++;
|
|
rbn = addressPXD(pxd);
|
|
rmp = get_metapage(ip, rbn, PSIZE, 1);
|
|
if (rmp == NULL)
|
|
return -EIO;
|
|
|
|
/* Allocate blocks to quota. */
|
|
if (DQUOT_ALLOC_BLOCK(ip, lengthPXD(pxd))) {
|
|
release_metapage(rmp);
|
|
return -EDQUOT;
|
|
}
|
|
|
|
jfs_info("xtSplitRoot: ip:0x%p rmp:0x%p", ip, rmp);
|
|
|
|
/*
|
|
* acquire a transaction lock on the new right page;
|
|
*
|
|
* action: new page;
|
|
*/
|
|
BT_MARK_DIRTY(rmp, ip);
|
|
|
|
rp = (xtpage_t *) rmp->data;
|
|
rp->header.flag =
|
|
(sp->header.flag & BT_LEAF) ? BT_LEAF : BT_INTERNAL;
|
|
rp->header.self = *pxd;
|
|
rp->header.nextindex = cpu_to_le16(XTENTRYSTART);
|
|
rp->header.maxentry = cpu_to_le16(PSIZE >> L2XTSLOTSIZE);
|
|
|
|
/* initialize sibling pointers */
|
|
rp->header.next = 0;
|
|
rp->header.prev = 0;
|
|
|
|
/*
|
|
* copy the in-line root page into new right page extent
|
|
*/
|
|
nextindex = le16_to_cpu(sp->header.maxentry);
|
|
memmove(&rp->xad[XTENTRYSTART], &sp->xad[XTENTRYSTART],
|
|
(nextindex - XTENTRYSTART) << L2XTSLOTSIZE);
|
|
|
|
/*
|
|
* insert the new entry into the new right/child page
|
|
* (skip index in the new right page will not change)
|
|
*/
|
|
skip = split->index;
|
|
/* if insert into middle, shift right remaining entries */
|
|
if (skip != nextindex)
|
|
memmove(&rp->xad[skip + 1], &rp->xad[skip],
|
|
(nextindex - skip) * sizeof(xad_t));
|
|
|
|
xad = &rp->xad[skip];
|
|
XT_PUTENTRY(xad, split->flag, split->off, split->len, split->addr);
|
|
|
|
/* update page header */
|
|
rp->header.nextindex = cpu_to_le16(nextindex + 1);
|
|
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
tlck = txLock(tid, ip, rmp, tlckXTREE | tlckNEW);
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
xtlck->lwm.offset = XTENTRYSTART;
|
|
xtlck->lwm.length = le16_to_cpu(rp->header.nextindex) -
|
|
XTENTRYSTART;
|
|
}
|
|
|
|
/*
|
|
* reset the root
|
|
*
|
|
* init root with the single entry for the new right page
|
|
* set the 1st entry offset to 0, which force the left-most key
|
|
* at any level of the tree to be less than any search key.
|
|
*/
|
|
/*
|
|
* acquire a transaction lock on the root page (in-memory inode);
|
|
*
|
|
* action: root split;
|
|
*/
|
|
BT_MARK_DIRTY(split->mp, ip);
|
|
|
|
xad = &sp->xad[XTENTRYSTART];
|
|
XT_PUTENTRY(xad, XAD_NEW, 0, JFS_SBI(ip->i_sb)->nbperpage, rbn);
|
|
|
|
/* update page header of root */
|
|
sp->header.flag &= ~BT_LEAF;
|
|
sp->header.flag |= BT_INTERNAL;
|
|
|
|
sp->header.nextindex = cpu_to_le16(XTENTRYSTART + 1);
|
|
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
tlck = txLock(tid, ip, split->mp, tlckXTREE | tlckGROW);
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
xtlck->lwm.offset = XTENTRYSTART;
|
|
xtlck->lwm.length = 1;
|
|
}
|
|
|
|
*rmpp = rmp;
|
|
|
|
jfs_info("xtSplitRoot: sp:0x%p rp:0x%p", sp, rp);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* xtExtend()
|
|
*
|
|
* function: extend in-place;
|
|
*
|
|
* note: existing extent may or may not have been committed.
|
|
* caller is responsible for pager buffer cache update, and
|
|
* working block allocation map update;
|
|
* update pmap: alloc whole extended extent;
|
|
*/
|
|
int xtExtend(tid_t tid, /* transaction id */
|
|
struct inode *ip, s64 xoff, /* delta extent offset */
|
|
s32 xlen, /* delta extent length */
|
|
int flag)
|
|
{
|
|
int rc = 0;
|
|
int cmp;
|
|
struct metapage *mp; /* meta-page buffer */
|
|
xtpage_t *p; /* base B+-tree index page */
|
|
s64 bn;
|
|
int index, nextindex, len;
|
|
struct btstack btstack; /* traverse stack */
|
|
struct xtsplit split; /* split information */
|
|
xad_t *xad;
|
|
s64 xaddr;
|
|
struct tlock *tlck;
|
|
struct xtlock *xtlck = NULL;
|
|
|
|
jfs_info("xtExtend: nxoff:0x%lx nxlen:0x%x", (ulong) xoff, xlen);
|
|
|
|
/* there must exist extent to be extended */
|
|
if ((rc = xtSearch(ip, xoff - 1, NULL, &cmp, &btstack, XT_INSERT)))
|
|
return rc;
|
|
|
|
/* retrieve search result */
|
|
XT_GETSEARCH(ip, btstack.top, bn, mp, p, index);
|
|
|
|
if (cmp != 0) {
|
|
XT_PUTPAGE(mp);
|
|
jfs_error(ip->i_sb, "xtExtend: xtSearch did not find extent");
|
|
return -EIO;
|
|
}
|
|
|
|
/* extension must be contiguous */
|
|
xad = &p->xad[index];
|
|
if ((offsetXAD(xad) + lengthXAD(xad)) != xoff) {
|
|
XT_PUTPAGE(mp);
|
|
jfs_error(ip->i_sb, "xtExtend: extension is not contiguous");
|
|
return -EIO;
|
|
}
|
|
|
|
/*
|
|
* acquire a transaction lock on the leaf page;
|
|
*
|
|
* action: xad insertion/extension;
|
|
*/
|
|
BT_MARK_DIRTY(mp, ip);
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
tlck = txLock(tid, ip, mp, tlckXTREE | tlckGROW);
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
}
|
|
|
|
/* extend will overflow extent ? */
|
|
xlen = lengthXAD(xad) + xlen;
|
|
if ((len = xlen - MAXXLEN) <= 0)
|
|
goto extendOld;
|
|
|
|
/*
|
|
* extent overflow: insert entry for new extent
|
|
*/
|
|
//insertNew:
|
|
xoff = offsetXAD(xad) + MAXXLEN;
|
|
xaddr = addressXAD(xad) + MAXXLEN;
|
|
nextindex = le16_to_cpu(p->header.nextindex);
|
|
|
|
/*
|
|
* if the leaf page is full, insert the new entry and
|
|
* propagate up the router entry for the new page from split
|
|
*
|
|
* The xtSplitUp() will insert the entry and unpin the leaf page.
|
|
*/
|
|
if (nextindex == le16_to_cpu(p->header.maxentry)) {
|
|
/* xtSpliUp() unpins leaf pages */
|
|
split.mp = mp;
|
|
split.index = index + 1;
|
|
split.flag = XAD_NEW;
|
|
split.off = xoff; /* split offset */
|
|
split.len = len;
|
|
split.addr = xaddr;
|
|
split.pxdlist = NULL;
|
|
if ((rc = xtSplitUp(tid, ip, &split, &btstack)))
|
|
return rc;
|
|
|
|
/* get back old page */
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
/*
|
|
* if leaf root has been split, original root has been
|
|
* copied to new child page, i.e., original entry now
|
|
* resides on the new child page;
|
|
*/
|
|
if (p->header.flag & BT_INTERNAL) {
|
|
ASSERT(p->header.nextindex ==
|
|
cpu_to_le16(XTENTRYSTART + 1));
|
|
xad = &p->xad[XTENTRYSTART];
|
|
bn = addressXAD(xad);
|
|
XT_PUTPAGE(mp);
|
|
|
|
/* get new child page */
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
BT_MARK_DIRTY(mp, ip);
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
tlck = txLock(tid, ip, mp, tlckXTREE|tlckGROW);
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
}
|
|
}
|
|
}
|
|
/*
|
|
* insert the new entry into the leaf page
|
|
*/
|
|
else {
|
|
/* insert the new entry: mark the entry NEW */
|
|
xad = &p->xad[index + 1];
|
|
XT_PUTENTRY(xad, XAD_NEW, xoff, len, xaddr);
|
|
|
|
/* advance next available entry index */
|
|
p->header.nextindex =
|
|
cpu_to_le16(le16_to_cpu(p->header.nextindex) + 1);
|
|
}
|
|
|
|
/* get back old entry */
|
|
xad = &p->xad[index];
|
|
xlen = MAXXLEN;
|
|
|
|
/*
|
|
* extend old extent
|
|
*/
|
|
extendOld:
|
|
XADlength(xad, xlen);
|
|
if (!(xad->flag & XAD_NEW))
|
|
xad->flag |= XAD_EXTENDED;
|
|
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
xtlck->lwm.offset =
|
|
(xtlck->lwm.offset) ? min(index,
|
|
(int)xtlck->lwm.offset) : index;
|
|
xtlck->lwm.length =
|
|
le16_to_cpu(p->header.nextindex) - xtlck->lwm.offset;
|
|
}
|
|
|
|
/* unpin the leaf page */
|
|
XT_PUTPAGE(mp);
|
|
|
|
return rc;
|
|
}
|
|
|
|
#ifdef _NOTYET
|
|
/*
|
|
* xtTailgate()
|
|
*
|
|
* function: split existing 'tail' extent
|
|
* (split offset >= start offset of tail extent), and
|
|
* relocate and extend the split tail half;
|
|
*
|
|
* note: existing extent may or may not have been committed.
|
|
* caller is responsible for pager buffer cache update, and
|
|
* working block allocation map update;
|
|
* update pmap: free old split tail extent, alloc new extent;
|
|
*/
|
|
int xtTailgate(tid_t tid, /* transaction id */
|
|
struct inode *ip, s64 xoff, /* split/new extent offset */
|
|
s32 xlen, /* new extent length */
|
|
s64 xaddr, /* new extent address */
|
|
int flag)
|
|
{
|
|
int rc = 0;
|
|
int cmp;
|
|
struct metapage *mp; /* meta-page buffer */
|
|
xtpage_t *p; /* base B+-tree index page */
|
|
s64 bn;
|
|
int index, nextindex, llen, rlen;
|
|
struct btstack btstack; /* traverse stack */
|
|
struct xtsplit split; /* split information */
|
|
xad_t *xad;
|
|
struct tlock *tlck;
|
|
struct xtlock *xtlck = 0;
|
|
struct tlock *mtlck;
|
|
struct maplock *pxdlock;
|
|
|
|
/*
|
|
printf("xtTailgate: nxoff:0x%lx nxlen:0x%x nxaddr:0x%lx\n",
|
|
(ulong)xoff, xlen, (ulong)xaddr);
|
|
*/
|
|
|
|
/* there must exist extent to be tailgated */
|
|
if ((rc = xtSearch(ip, xoff, NULL, &cmp, &btstack, XT_INSERT)))
|
|
return rc;
|
|
|
|
/* retrieve search result */
|
|
XT_GETSEARCH(ip, btstack.top, bn, mp, p, index);
|
|
|
|
if (cmp != 0) {
|
|
XT_PUTPAGE(mp);
|
|
jfs_error(ip->i_sb, "xtTailgate: couldn't find extent");
|
|
return -EIO;
|
|
}
|
|
|
|
/* entry found must be last entry */
|
|
nextindex = le16_to_cpu(p->header.nextindex);
|
|
if (index != nextindex - 1) {
|
|
XT_PUTPAGE(mp);
|
|
jfs_error(ip->i_sb,
|
|
"xtTailgate: the entry found is not the last entry");
|
|
return -EIO;
|
|
}
|
|
|
|
BT_MARK_DIRTY(mp, ip);
|
|
/*
|
|
* acquire tlock of the leaf page containing original entry
|
|
*/
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
tlck = txLock(tid, ip, mp, tlckXTREE | tlckGROW);
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
}
|
|
|
|
/* completely replace extent ? */
|
|
xad = &p->xad[index];
|
|
/*
|
|
printf("xtTailgate: xoff:0x%lx xlen:0x%x xaddr:0x%lx\n",
|
|
(ulong)offsetXAD(xad), lengthXAD(xad), (ulong)addressXAD(xad));
|
|
*/
|
|
if ((llen = xoff - offsetXAD(xad)) == 0)
|
|
goto updateOld;
|
|
|
|
/*
|
|
* partially replace extent: insert entry for new extent
|
|
*/
|
|
//insertNew:
|
|
/*
|
|
* if the leaf page is full, insert the new entry and
|
|
* propagate up the router entry for the new page from split
|
|
*
|
|
* The xtSplitUp() will insert the entry and unpin the leaf page.
|
|
*/
|
|
if (nextindex == le16_to_cpu(p->header.maxentry)) {
|
|
/* xtSpliUp() unpins leaf pages */
|
|
split.mp = mp;
|
|
split.index = index + 1;
|
|
split.flag = XAD_NEW;
|
|
split.off = xoff; /* split offset */
|
|
split.len = xlen;
|
|
split.addr = xaddr;
|
|
split.pxdlist = NULL;
|
|
if ((rc = xtSplitUp(tid, ip, &split, &btstack)))
|
|
return rc;
|
|
|
|
/* get back old page */
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
/*
|
|
* if leaf root has been split, original root has been
|
|
* copied to new child page, i.e., original entry now
|
|
* resides on the new child page;
|
|
*/
|
|
if (p->header.flag & BT_INTERNAL) {
|
|
ASSERT(p->header.nextindex ==
|
|
cpu_to_le16(XTENTRYSTART + 1));
|
|
xad = &p->xad[XTENTRYSTART];
|
|
bn = addressXAD(xad);
|
|
XT_PUTPAGE(mp);
|
|
|
|
/* get new child page */
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
BT_MARK_DIRTY(mp, ip);
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
tlck = txLock(tid, ip, mp, tlckXTREE|tlckGROW);
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
}
|
|
}
|
|
}
|
|
/*
|
|
* insert the new entry into the leaf page
|
|
*/
|
|
else {
|
|
/* insert the new entry: mark the entry NEW */
|
|
xad = &p->xad[index + 1];
|
|
XT_PUTENTRY(xad, XAD_NEW, xoff, xlen, xaddr);
|
|
|
|
/* advance next available entry index */
|
|
p->header.nextindex =
|
|
cpu_to_le16(le16_to_cpu(p->header.nextindex) + 1);
|
|
}
|
|
|
|
/* get back old XAD */
|
|
xad = &p->xad[index];
|
|
|
|
/*
|
|
* truncate/relocate old extent at split offset
|
|
*/
|
|
updateOld:
|
|
/* update dmap for old/committed/truncated extent */
|
|
rlen = lengthXAD(xad) - llen;
|
|
if (!(xad->flag & XAD_NEW)) {
|
|
/* free from PWMAP at commit */
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
mtlck = txMaplock(tid, ip, tlckMAP);
|
|
pxdlock = (struct maplock *) & mtlck->lock;
|
|
pxdlock->flag = mlckFREEPXD;
|
|
PXDaddress(&pxdlock->pxd, addressXAD(xad) + llen);
|
|
PXDlength(&pxdlock->pxd, rlen);
|
|
pxdlock->index = 1;
|
|
}
|
|
} else
|
|
/* free from WMAP */
|
|
dbFree(ip, addressXAD(xad) + llen, (s64) rlen);
|
|
|
|
if (llen)
|
|
/* truncate */
|
|
XADlength(xad, llen);
|
|
else
|
|
/* replace */
|
|
XT_PUTENTRY(xad, XAD_NEW, xoff, xlen, xaddr);
|
|
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
xtlck->lwm.offset = (xtlck->lwm.offset) ?
|
|
min(index, (int)xtlck->lwm.offset) : index;
|
|
xtlck->lwm.length = le16_to_cpu(p->header.nextindex) -
|
|
xtlck->lwm.offset;
|
|
}
|
|
|
|
/* unpin the leaf page */
|
|
XT_PUTPAGE(mp);
|
|
|
|
return rc;
|
|
}
|
|
#endif /* _NOTYET */
|
|
|
|
/*
|
|
* xtUpdate()
|
|
*
|
|
* function: update XAD;
|
|
*
|
|
* update extent for allocated_but_not_recorded or
|
|
* compressed extent;
|
|
*
|
|
* parameter:
|
|
* nxad - new XAD;
|
|
* logical extent of the specified XAD must be completely
|
|
* contained by an existing XAD;
|
|
*/
|
|
int xtUpdate(tid_t tid, struct inode *ip, xad_t * nxad)
|
|
{ /* new XAD */
|
|
int rc = 0;
|
|
int cmp;
|
|
struct metapage *mp; /* meta-page buffer */
|
|
xtpage_t *p; /* base B+-tree index page */
|
|
s64 bn;
|
|
int index0, index, newindex, nextindex;
|
|
struct btstack btstack; /* traverse stack */
|
|
struct xtsplit split; /* split information */
|
|
xad_t *xad, *lxad, *rxad;
|
|
int xflag;
|
|
s64 nxoff, xoff;
|
|
int nxlen, xlen, lxlen, rxlen;
|
|
s64 nxaddr, xaddr;
|
|
struct tlock *tlck;
|
|
struct xtlock *xtlck = NULL;
|
|
int newpage = 0;
|
|
|
|
/* there must exist extent to be tailgated */
|
|
nxoff = offsetXAD(nxad);
|
|
nxlen = lengthXAD(nxad);
|
|
nxaddr = addressXAD(nxad);
|
|
|
|
if ((rc = xtSearch(ip, nxoff, NULL, &cmp, &btstack, XT_INSERT)))
|
|
return rc;
|
|
|
|
/* retrieve search result */
|
|
XT_GETSEARCH(ip, btstack.top, bn, mp, p, index0);
|
|
|
|
if (cmp != 0) {
|
|
XT_PUTPAGE(mp);
|
|
jfs_error(ip->i_sb, "xtUpdate: Could not find extent");
|
|
return -EIO;
|
|
}
|
|
|
|
BT_MARK_DIRTY(mp, ip);
|
|
/*
|
|
* acquire tlock of the leaf page containing original entry
|
|
*/
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
tlck = txLock(tid, ip, mp, tlckXTREE | tlckGROW);
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
}
|
|
|
|
xad = &p->xad[index0];
|
|
xflag = xad->flag;
|
|
xoff = offsetXAD(xad);
|
|
xlen = lengthXAD(xad);
|
|
xaddr = addressXAD(xad);
|
|
|
|
/* nXAD must be completely contained within XAD */
|
|
if ((xoff > nxoff) ||
|
|
(nxoff + nxlen > xoff + xlen)) {
|
|
XT_PUTPAGE(mp);
|
|
jfs_error(ip->i_sb,
|
|
"xtUpdate: nXAD in not completely contained within XAD");
|
|
return -EIO;
|
|
}
|
|
|
|
index = index0;
|
|
newindex = index + 1;
|
|
nextindex = le16_to_cpu(p->header.nextindex);
|
|
|
|
#ifdef _JFS_WIP_NOCOALESCE
|
|
if (xoff < nxoff)
|
|
goto updateRight;
|
|
|
|
/*
|
|
* replace XAD with nXAD
|
|
*/
|
|
replace: /* (nxoff == xoff) */
|
|
if (nxlen == xlen) {
|
|
/* replace XAD with nXAD:recorded */
|
|
*xad = *nxad;
|
|
xad->flag = xflag & ~XAD_NOTRECORDED;
|
|
|
|
goto out;
|
|
} else /* (nxlen < xlen) */
|
|
goto updateLeft;
|
|
#endif /* _JFS_WIP_NOCOALESCE */
|
|
|
|
/* #ifdef _JFS_WIP_COALESCE */
|
|
if (xoff < nxoff)
|
|
goto coalesceRight;
|
|
|
|
/*
|
|
* coalesce with left XAD
|
|
*/
|
|
//coalesceLeft: /* (xoff == nxoff) */
|
|
/* is XAD first entry of page ? */
|
|
if (index == XTENTRYSTART)
|
|
goto replace;
|
|
|
|
/* is nXAD logically and physically contiguous with lXAD ? */
|
|
lxad = &p->xad[index - 1];
|
|
lxlen = lengthXAD(lxad);
|
|
if (!(lxad->flag & XAD_NOTRECORDED) &&
|
|
(nxoff == offsetXAD(lxad) + lxlen) &&
|
|
(nxaddr == addressXAD(lxad) + lxlen) &&
|
|
(lxlen + nxlen < MAXXLEN)) {
|
|
/* extend right lXAD */
|
|
index0 = index - 1;
|
|
XADlength(lxad, lxlen + nxlen);
|
|
|
|
/* If we just merged two extents together, need to make sure the
|
|
* right extent gets logged. If the left one is marked XAD_NEW,
|
|
* then we know it will be logged. Otherwise, mark as
|
|
* XAD_EXTENDED
|
|
*/
|
|
if (!(lxad->flag & XAD_NEW))
|
|
lxad->flag |= XAD_EXTENDED;
|
|
|
|
if (xlen > nxlen) {
|
|
/* truncate XAD */
|
|
XADoffset(xad, xoff + nxlen);
|
|
XADlength(xad, xlen - nxlen);
|
|
XADaddress(xad, xaddr + nxlen);
|
|
goto out;
|
|
} else { /* (xlen == nxlen) */
|
|
|
|
/* remove XAD */
|
|
if (index < nextindex - 1)
|
|
memmove(&p->xad[index], &p->xad[index + 1],
|
|
(nextindex - index -
|
|
1) << L2XTSLOTSIZE);
|
|
|
|
p->header.nextindex =
|
|
cpu_to_le16(le16_to_cpu(p->header.nextindex) -
|
|
1);
|
|
|
|
index = index0;
|
|
newindex = index + 1;
|
|
nextindex = le16_to_cpu(p->header.nextindex);
|
|
xoff = nxoff = offsetXAD(lxad);
|
|
xlen = nxlen = lxlen + nxlen;
|
|
xaddr = nxaddr = addressXAD(lxad);
|
|
goto coalesceRight;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* replace XAD with nXAD
|
|
*/
|
|
replace: /* (nxoff == xoff) */
|
|
if (nxlen == xlen) {
|
|
/* replace XAD with nXAD:recorded */
|
|
*xad = *nxad;
|
|
xad->flag = xflag & ~XAD_NOTRECORDED;
|
|
|
|
goto coalesceRight;
|
|
} else /* (nxlen < xlen) */
|
|
goto updateLeft;
|
|
|
|
/*
|
|
* coalesce with right XAD
|
|
*/
|
|
coalesceRight: /* (xoff <= nxoff) */
|
|
/* is XAD last entry of page ? */
|
|
if (newindex == nextindex) {
|
|
if (xoff == nxoff)
|
|
goto out;
|
|
goto updateRight;
|
|
}
|
|
|
|
/* is nXAD logically and physically contiguous with rXAD ? */
|
|
rxad = &p->xad[index + 1];
|
|
rxlen = lengthXAD(rxad);
|
|
if (!(rxad->flag & XAD_NOTRECORDED) &&
|
|
(nxoff + nxlen == offsetXAD(rxad)) &&
|
|
(nxaddr + nxlen == addressXAD(rxad)) &&
|
|
(rxlen + nxlen < MAXXLEN)) {
|
|
/* extend left rXAD */
|
|
XADoffset(rxad, nxoff);
|
|
XADlength(rxad, rxlen + nxlen);
|
|
XADaddress(rxad, nxaddr);
|
|
|
|
/* If we just merged two extents together, need to make sure
|
|
* the left extent gets logged. If the right one is marked
|
|
* XAD_NEW, then we know it will be logged. Otherwise, mark as
|
|
* XAD_EXTENDED
|
|
*/
|
|
if (!(rxad->flag & XAD_NEW))
|
|
rxad->flag |= XAD_EXTENDED;
|
|
|
|
if (xlen > nxlen)
|
|
/* truncate XAD */
|
|
XADlength(xad, xlen - nxlen);
|
|
else { /* (xlen == nxlen) */
|
|
|
|
/* remove XAD */
|
|
memmove(&p->xad[index], &p->xad[index + 1],
|
|
(nextindex - index - 1) << L2XTSLOTSIZE);
|
|
|
|
p->header.nextindex =
|
|
cpu_to_le16(le16_to_cpu(p->header.nextindex) -
|
|
1);
|
|
}
|
|
|
|
goto out;
|
|
} else if (xoff == nxoff)
|
|
goto out;
|
|
|
|
if (xoff >= nxoff) {
|
|
XT_PUTPAGE(mp);
|
|
jfs_error(ip->i_sb, "xtUpdate: xoff >= nxoff");
|
|
return -EIO;
|
|
}
|
|
/* #endif _JFS_WIP_COALESCE */
|
|
|
|
/*
|
|
* split XAD into (lXAD, nXAD):
|
|
*
|
|
* |---nXAD--->
|
|
* --|----------XAD----------|--
|
|
* |-lXAD-|
|
|
*/
|
|
updateRight: /* (xoff < nxoff) */
|
|
/* truncate old XAD as lXAD:not_recorded */
|
|
xad = &p->xad[index];
|
|
XADlength(xad, nxoff - xoff);
|
|
|
|
/* insert nXAD:recorded */
|
|
if (nextindex == le16_to_cpu(p->header.maxentry)) {
|
|
|
|
/* xtSpliUp() unpins leaf pages */
|
|
split.mp = mp;
|
|
split.index = newindex;
|
|
split.flag = xflag & ~XAD_NOTRECORDED;
|
|
split.off = nxoff;
|
|
split.len = nxlen;
|
|
split.addr = nxaddr;
|
|
split.pxdlist = NULL;
|
|
if ((rc = xtSplitUp(tid, ip, &split, &btstack)))
|
|
return rc;
|
|
|
|
/* get back old page */
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
/*
|
|
* if leaf root has been split, original root has been
|
|
* copied to new child page, i.e., original entry now
|
|
* resides on the new child page;
|
|
*/
|
|
if (p->header.flag & BT_INTERNAL) {
|
|
ASSERT(p->header.nextindex ==
|
|
cpu_to_le16(XTENTRYSTART + 1));
|
|
xad = &p->xad[XTENTRYSTART];
|
|
bn = addressXAD(xad);
|
|
XT_PUTPAGE(mp);
|
|
|
|
/* get new child page */
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
BT_MARK_DIRTY(mp, ip);
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
tlck = txLock(tid, ip, mp, tlckXTREE|tlckGROW);
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
}
|
|
} else {
|
|
/* is nXAD on new page ? */
|
|
if (newindex >
|
|
(le16_to_cpu(p->header.maxentry) >> 1)) {
|
|
newindex =
|
|
newindex -
|
|
le16_to_cpu(p->header.nextindex) +
|
|
XTENTRYSTART;
|
|
newpage = 1;
|
|
}
|
|
}
|
|
} else {
|
|
/* if insert into middle, shift right remaining entries */
|
|
if (newindex < nextindex)
|
|
memmove(&p->xad[newindex + 1], &p->xad[newindex],
|
|
(nextindex - newindex) << L2XTSLOTSIZE);
|
|
|
|
/* insert the entry */
|
|
xad = &p->xad[newindex];
|
|
*xad = *nxad;
|
|
xad->flag = xflag & ~XAD_NOTRECORDED;
|
|
|
|
/* advance next available entry index. */
|
|
p->header.nextindex =
|
|
cpu_to_le16(le16_to_cpu(p->header.nextindex) + 1);
|
|
}
|
|
|
|
/*
|
|
* does nXAD force 3-way split ?
|
|
*
|
|
* |---nXAD--->|
|
|
* --|----------XAD-------------|--
|
|
* |-lXAD-| |-rXAD -|
|
|
*/
|
|
if (nxoff + nxlen == xoff + xlen)
|
|
goto out;
|
|
|
|
/* reorient nXAD as XAD for further split XAD into (nXAD, rXAD) */
|
|
if (newpage) {
|
|
/* close out old page */
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
xtlck->lwm.offset = (xtlck->lwm.offset) ?
|
|
min(index0, (int)xtlck->lwm.offset) : index0;
|
|
xtlck->lwm.length =
|
|
le16_to_cpu(p->header.nextindex) -
|
|
xtlck->lwm.offset;
|
|
}
|
|
|
|
bn = le64_to_cpu(p->header.next);
|
|
XT_PUTPAGE(mp);
|
|
|
|
/* get new right page */
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
BT_MARK_DIRTY(mp, ip);
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
tlck = txLock(tid, ip, mp, tlckXTREE | tlckGROW);
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
}
|
|
|
|
index0 = index = newindex;
|
|
} else
|
|
index++;
|
|
|
|
newindex = index + 1;
|
|
nextindex = le16_to_cpu(p->header.nextindex);
|
|
xlen = xlen - (nxoff - xoff);
|
|
xoff = nxoff;
|
|
xaddr = nxaddr;
|
|
|
|
/* recompute split pages */
|
|
if (nextindex == le16_to_cpu(p->header.maxentry)) {
|
|
XT_PUTPAGE(mp);
|
|
|
|
if ((rc = xtSearch(ip, nxoff, NULL, &cmp, &btstack, XT_INSERT)))
|
|
return rc;
|
|
|
|
/* retrieve search result */
|
|
XT_GETSEARCH(ip, btstack.top, bn, mp, p, index0);
|
|
|
|
if (cmp != 0) {
|
|
XT_PUTPAGE(mp);
|
|
jfs_error(ip->i_sb, "xtUpdate: xtSearch failed");
|
|
return -EIO;
|
|
}
|
|
|
|
if (index0 != index) {
|
|
XT_PUTPAGE(mp);
|
|
jfs_error(ip->i_sb,
|
|
"xtUpdate: unexpected value of index");
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* split XAD into (nXAD, rXAD)
|
|
*
|
|
* ---nXAD---|
|
|
* --|----------XAD----------|--
|
|
* |-rXAD-|
|
|
*/
|
|
updateLeft: /* (nxoff == xoff) && (nxlen < xlen) */
|
|
/* update old XAD with nXAD:recorded */
|
|
xad = &p->xad[index];
|
|
*xad = *nxad;
|
|
xad->flag = xflag & ~XAD_NOTRECORDED;
|
|
|
|
/* insert rXAD:not_recorded */
|
|
xoff = xoff + nxlen;
|
|
xlen = xlen - nxlen;
|
|
xaddr = xaddr + nxlen;
|
|
if (nextindex == le16_to_cpu(p->header.maxentry)) {
|
|
/*
|
|
printf("xtUpdate.updateLeft.split p:0x%p\n", p);
|
|
*/
|
|
/* xtSpliUp() unpins leaf pages */
|
|
split.mp = mp;
|
|
split.index = newindex;
|
|
split.flag = xflag;
|
|
split.off = xoff;
|
|
split.len = xlen;
|
|
split.addr = xaddr;
|
|
split.pxdlist = NULL;
|
|
if ((rc = xtSplitUp(tid, ip, &split, &btstack)))
|
|
return rc;
|
|
|
|
/* get back old page */
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/*
|
|
* if leaf root has been split, original root has been
|
|
* copied to new child page, i.e., original entry now
|
|
* resides on the new child page;
|
|
*/
|
|
if (p->header.flag & BT_INTERNAL) {
|
|
ASSERT(p->header.nextindex ==
|
|
cpu_to_le16(XTENTRYSTART + 1));
|
|
xad = &p->xad[XTENTRYSTART];
|
|
bn = addressXAD(xad);
|
|
XT_PUTPAGE(mp);
|
|
|
|
/* get new child page */
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
BT_MARK_DIRTY(mp, ip);
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
tlck = txLock(tid, ip, mp, tlckXTREE|tlckGROW);
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
}
|
|
}
|
|
} else {
|
|
/* if insert into middle, shift right remaining entries */
|
|
if (newindex < nextindex)
|
|
memmove(&p->xad[newindex + 1], &p->xad[newindex],
|
|
(nextindex - newindex) << L2XTSLOTSIZE);
|
|
|
|
/* insert the entry */
|
|
xad = &p->xad[newindex];
|
|
XT_PUTENTRY(xad, xflag, xoff, xlen, xaddr);
|
|
|
|
/* advance next available entry index. */
|
|
p->header.nextindex =
|
|
cpu_to_le16(le16_to_cpu(p->header.nextindex) + 1);
|
|
}
|
|
|
|
out:
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
|
xtlck->lwm.offset = (xtlck->lwm.offset) ?
|
|
min(index0, (int)xtlck->lwm.offset) : index0;
|
|
xtlck->lwm.length = le16_to_cpu(p->header.nextindex) -
|
|
xtlck->lwm.offset;
|
|
}
|
|
|
|
/* unpin the leaf page */
|
|
XT_PUTPAGE(mp);
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
/*
|
|
* xtAppend()
|
|
*
|
|
* function: grow in append mode from contiguous region specified ;
|
|
*
|
|
* parameter:
|
|
* tid - transaction id;
|
|
* ip - file object;
|
|
* xflag - extent flag:
|
|
* xoff - extent offset;
|
|
* maxblocks - max extent length;
|
|
* xlen - extent length (in/out);
|
|
* xaddrp - extent address pointer (in/out):
|
|
* flag -
|
|
*
|
|
* return:
|
|
*/
|
|
int xtAppend(tid_t tid, /* transaction id */
|
|
struct inode *ip, int xflag, s64 xoff, s32 maxblocks,
|
|
s32 * xlenp, /* (in/out) */
|
|
s64 * xaddrp, /* (in/out) */
|
|
int flag)
|
|
{
|
|
int rc = 0;
|
|
struct metapage *mp; /* meta-page buffer */
|
|
xtpage_t *p; /* base B+-tree index page */
|
|
s64 bn, xaddr;
|
|
int index, nextindex;
|
|
struct btstack btstack; /* traverse stack */
|
|
struct xtsplit split; /* split information */
|
|
xad_t *xad;
|
|
int cmp;
|
|
struct tlock *tlck;
|
|
struct xtlock *xtlck;
|
|
int nsplit, nblocks, xlen;
|
|
struct pxdlist pxdlist;
|
|
pxd_t *pxd;
|
|
s64 next;
|
|
|
|
xaddr = *xaddrp;
|
|
xlen = *xlenp;
|
|
jfs_info("xtAppend: xoff:0x%lx maxblocks:%d xlen:%d xaddr:0x%lx",
|
|
(ulong) xoff, maxblocks, xlen, (ulong) xaddr);
|
|
|
|
/*
|
|
* search for the entry location at which to insert:
|
|
*
|
|
* xtFastSearch() and xtSearch() both returns (leaf page
|
|
* pinned, index at which to insert).
|
|
* n.b. xtSearch() may return index of maxentry of
|
|
* the full page.
|
|
*/
|
|
if ((rc = xtSearch(ip, xoff, &next, &cmp, &btstack, XT_INSERT)))
|
|
return rc;
|
|
|
|
/* retrieve search result */
|
|
XT_GETSEARCH(ip, btstack.top, bn, mp, p, index);
|
|
|
|
if (cmp == 0) {
|
|
rc = -EEXIST;
|
|
goto out;
|
|
}
|
|
|
|
if (next)
|
|
xlen = min(xlen, (int)(next - xoff));
|
|
//insert:
|
|
/*
|
|
* insert entry for new extent
|
|
*/
|
|
xflag |= XAD_NEW;
|
|
|
|
/*
|
|
* if the leaf page is full, split the page and
|
|
* propagate up the router entry for the new page from split
|
|
*
|
|
* The xtSplitUp() will insert the entry and unpin the leaf page.
|
|
*/
|
|
nextindex = le16_to_cpu(p->header.nextindex);
|
|
if (nextindex < le16_to_cpu(p->header.maxentry))
|
|
goto insertLeaf;
|
|
|
|
/*
|
|
* allocate new index blocks to cover index page split(s)
|
|
*/
|
|
nsplit = btstack.nsplit;
|
|
split.pxdlist = &pxdlist;
|
|
pxdlist.maxnpxd = pxdlist.npxd = 0;
|
|
pxd = &pxdlist.pxd[0];
|
|
nblocks = JFS_SBI(ip->i_sb)->nbperpage;
|
|
for (; nsplit > 0; nsplit--, pxd++, xaddr += nblocks, maxblocks -= nblocks) {
|
|
if ((rc = dbAllocBottomUp(ip, xaddr, (s64) nblocks)) == 0) {
|
|
PXDaddress(pxd, xaddr);
|
|
PXDlength(pxd, nblocks);
|
|
|
|
pxdlist.maxnpxd++;
|
|
|
|
continue;
|
|
}
|
|
|
|
/* undo allocation */
|
|
|
|
goto out;
|
|
}
|
|
|
|
xlen = min(xlen, maxblocks);
|
|
|
|
/*
|
|
* allocate data extent requested
|
|
*/
|
|
if ((rc = dbAllocBottomUp(ip, xaddr, (s64) xlen)))
|
|
goto out;
|
|
|
|
split.mp = mp;
|
|
split.index = index;
|
|
split.flag = xflag;
|
|
split.off = xoff;
|
|
split.len = xlen;
|
|
split.addr = xaddr;
|
|
if ((rc = xtSplitUp(tid, ip, &split, &btstack))) {
|
|
/* undo data extent allocation */
|
|
dbFree(ip, *xaddrp, (s64) * xlenp);
|
|
|
|
return rc;
|
|
}
|
|
|
|
*xaddrp = xaddr;
|
|
*xlenp = xlen;
|
|
return 0;
|
|
|
|
/*
|
|
* insert the new entry into the leaf page
|
|
*/
|
|
insertLeaf:
|
|
/*
|
|
* allocate data extent requested
|
|
*/
|
|
if ((rc = dbAllocBottomUp(ip, xaddr, (s64) xlen)))
|
|
goto out;
|
|
|
|
BT_MARK_DIRTY(mp, ip);
|
|
/*
|
|
* acquire a transaction lock on the leaf page;
|
|
*
|
|
* action: xad insertion/extension;
|
|
*/
|
|
tlck = txLock(tid, ip, mp, tlckXTREE | tlckGROW);
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
|
|
/* insert the new entry: mark the entry NEW */
|
|
xad = &p->xad[index];
|
|
XT_PUTENTRY(xad, xflag, xoff, xlen, xaddr);
|
|
|
|
/* advance next available entry index */
|
|
p->header.nextindex =
|
|
cpu_to_le16(le16_to_cpu(p->header.nextindex) + 1);
|
|
|
|
xtlck->lwm.offset =
|
|
(xtlck->lwm.offset) ? min(index,(int) xtlck->lwm.offset) : index;
|
|
xtlck->lwm.length = le16_to_cpu(p->header.nextindex) -
|
|
xtlck->lwm.offset;
|
|
|
|
*xaddrp = xaddr;
|
|
*xlenp = xlen;
|
|
|
|
out:
|
|
/* unpin the leaf page */
|
|
XT_PUTPAGE(mp);
|
|
|
|
return rc;
|
|
}
|
|
#ifdef _STILL_TO_PORT
|
|
|
|
/* - TBD for defragmentaion/reorganization -
|
|
*
|
|
* xtDelete()
|
|
*
|
|
* function:
|
|
* delete the entry with the specified key.
|
|
*
|
|
* N.B.: whole extent of the entry is assumed to be deleted.
|
|
*
|
|
* parameter:
|
|
*
|
|
* return:
|
|
* ENOENT: if the entry is not found.
|
|
*
|
|
* exception:
|
|
*/
|
|
int xtDelete(tid_t tid, struct inode *ip, s64 xoff, s32 xlen, int flag)
|
|
{
|
|
int rc = 0;
|
|
struct btstack btstack;
|
|
int cmp;
|
|
s64 bn;
|
|
struct metapage *mp;
|
|
xtpage_t *p;
|
|
int index, nextindex;
|
|
struct tlock *tlck;
|
|
struct xtlock *xtlck;
|
|
|
|
/*
|
|
* find the matching entry; xtSearch() pins the page
|
|
*/
|
|
if ((rc = xtSearch(ip, xoff, NULL, &cmp, &btstack, 0)))
|
|
return rc;
|
|
|
|
XT_GETSEARCH(ip, btstack.top, bn, mp, p, index);
|
|
if (cmp) {
|
|
/* unpin the leaf page */
|
|
XT_PUTPAGE(mp);
|
|
return -ENOENT;
|
|
}
|
|
|
|
/*
|
|
* delete the entry from the leaf page
|
|
*/
|
|
nextindex = le16_to_cpu(p->header.nextindex);
|
|
p->header.nextindex =
|
|
cpu_to_le16(le16_to_cpu(p->header.nextindex) - 1);
|
|
|
|
/*
|
|
* if the leaf page bocome empty, free the page
|
|
*/
|
|
if (p->header.nextindex == cpu_to_le16(XTENTRYSTART))
|
|
return (xtDeleteUp(tid, ip, mp, p, &btstack));
|
|
|
|
BT_MARK_DIRTY(mp, ip);
|
|
/*
|
|
* acquire a transaction lock on the leaf page;
|
|
*
|
|
* action:xad deletion;
|
|
*/
|
|
tlck = txLock(tid, ip, mp, tlckXTREE);
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
xtlck->lwm.offset =
|
|
(xtlck->lwm.offset) ? min(index, xtlck->lwm.offset) : index;
|
|
|
|
/* if delete from middle, shift left/compact the remaining entries */
|
|
if (index < nextindex - 1)
|
|
memmove(&p->xad[index], &p->xad[index + 1],
|
|
(nextindex - index - 1) * sizeof(xad_t));
|
|
|
|
XT_PUTPAGE(mp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* - TBD for defragmentaion/reorganization -
|
|
*
|
|
* xtDeleteUp()
|
|
*
|
|
* function:
|
|
* free empty pages as propagating deletion up the tree
|
|
*
|
|
* parameter:
|
|
*
|
|
* return:
|
|
*/
|
|
static int
|
|
xtDeleteUp(tid_t tid, struct inode *ip,
|
|
struct metapage * fmp, xtpage_t * fp, struct btstack * btstack)
|
|
{
|
|
int rc = 0;
|
|
struct metapage *mp;
|
|
xtpage_t *p;
|
|
int index, nextindex;
|
|
s64 xaddr;
|
|
int xlen;
|
|
struct btframe *parent;
|
|
struct tlock *tlck;
|
|
struct xtlock *xtlck;
|
|
|
|
/*
|
|
* keep root leaf page which has become empty
|
|
*/
|
|
if (fp->header.flag & BT_ROOT) {
|
|
/* keep the root page */
|
|
fp->header.flag &= ~BT_INTERNAL;
|
|
fp->header.flag |= BT_LEAF;
|
|
fp->header.nextindex = cpu_to_le16(XTENTRYSTART);
|
|
|
|
/* XT_PUTPAGE(fmp); */
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* free non-root leaf page
|
|
*/
|
|
if ((rc = xtRelink(tid, ip, fp))) {
|
|
XT_PUTPAGE(fmp);
|
|
return rc;
|
|
}
|
|
|
|
xaddr = addressPXD(&fp->header.self);
|
|
xlen = lengthPXD(&fp->header.self);
|
|
/* free the page extent */
|
|
dbFree(ip, xaddr, (s64) xlen);
|
|
|
|
/* free the buffer page */
|
|
discard_metapage(fmp);
|
|
|
|
/*
|
|
* propagate page deletion up the index tree
|
|
*
|
|
* If the delete from the parent page makes it empty,
|
|
* continue all the way up the tree.
|
|
* stop if the root page is reached (which is never deleted) or
|
|
* if the entry deletion does not empty the page.
|
|
*/
|
|
while ((parent = BT_POP(btstack)) != NULL) {
|
|
/* get/pin the parent page <sp> */
|
|
XT_GETPAGE(ip, parent->bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
index = parent->index;
|
|
|
|
/* delete the entry for the freed child page from parent.
|
|
*/
|
|
nextindex = le16_to_cpu(p->header.nextindex);
|
|
|
|
/*
|
|
* the parent has the single entry being deleted:
|
|
* free the parent page which has become empty.
|
|
*/
|
|
if (nextindex == 1) {
|
|
if (p->header.flag & BT_ROOT) {
|
|
/* keep the root page */
|
|
p->header.flag &= ~BT_INTERNAL;
|
|
p->header.flag |= BT_LEAF;
|
|
p->header.nextindex =
|
|
cpu_to_le16(XTENTRYSTART);
|
|
|
|
/* XT_PUTPAGE(mp); */
|
|
|
|
break;
|
|
} else {
|
|
/* free the parent page */
|
|
if ((rc = xtRelink(tid, ip, p)))
|
|
return rc;
|
|
|
|
xaddr = addressPXD(&p->header.self);
|
|
/* free the page extent */
|
|
dbFree(ip, xaddr,
|
|
(s64) JFS_SBI(ip->i_sb)->nbperpage);
|
|
|
|
/* unpin/free the buffer page */
|
|
discard_metapage(mp);
|
|
|
|
/* propagate up */
|
|
continue;
|
|
}
|
|
}
|
|
/*
|
|
* the parent has other entries remaining:
|
|
* delete the router entry from the parent page.
|
|
*/
|
|
else {
|
|
BT_MARK_DIRTY(mp, ip);
|
|
/*
|
|
* acquire a transaction lock on the leaf page;
|
|
*
|
|
* action:xad deletion;
|
|
*/
|
|
tlck = txLock(tid, ip, mp, tlckXTREE);
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
xtlck->lwm.offset =
|
|
(xtlck->lwm.offset) ? min(index,
|
|
xtlck->lwm.
|
|
offset) : index;
|
|
|
|
/* if delete from middle,
|
|
* shift left/compact the remaining entries in the page
|
|
*/
|
|
if (index < nextindex - 1)
|
|
memmove(&p->xad[index], &p->xad[index + 1],
|
|
(nextindex - index -
|
|
1) << L2XTSLOTSIZE);
|
|
|
|
p->header.nextindex =
|
|
cpu_to_le16(le16_to_cpu(p->header.nextindex) -
|
|
1);
|
|
jfs_info("xtDeleteUp(entry): 0x%lx[%d]",
|
|
(ulong) parent->bn, index);
|
|
}
|
|
|
|
/* unpin the parent page */
|
|
XT_PUTPAGE(mp);
|
|
|
|
/* exit propagation up */
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* NAME: xtRelocate()
|
|
*
|
|
* FUNCTION: relocate xtpage or data extent of regular file;
|
|
* This function is mainly used by defragfs utility.
|
|
*
|
|
* NOTE: This routine does not have the logic to handle
|
|
* uncommitted allocated extent. The caller should call
|
|
* txCommit() to commit all the allocation before call
|
|
* this routine.
|
|
*/
|
|
int
|
|
xtRelocate(tid_t tid, struct inode * ip, xad_t * oxad, /* old XAD */
|
|
s64 nxaddr, /* new xaddr */
|
|
int xtype)
|
|
{ /* extent type: XTPAGE or DATAEXT */
|
|
int rc = 0;
|
|
struct tblock *tblk;
|
|
struct tlock *tlck;
|
|
struct xtlock *xtlck;
|
|
struct metapage *mp, *pmp, *lmp, *rmp; /* meta-page buffer */
|
|
xtpage_t *p, *pp, *rp, *lp; /* base B+-tree index page */
|
|
xad_t *xad;
|
|
pxd_t *pxd;
|
|
s64 xoff, xsize;
|
|
int xlen;
|
|
s64 oxaddr, sxaddr, dxaddr, nextbn, prevbn;
|
|
cbuf_t *cp;
|
|
s64 offset, nbytes, nbrd, pno;
|
|
int nb, npages, nblks;
|
|
s64 bn;
|
|
int cmp;
|
|
int index;
|
|
struct pxd_lock *pxdlock;
|
|
struct btstack btstack; /* traverse stack */
|
|
|
|
xtype = xtype & EXTENT_TYPE;
|
|
|
|
xoff = offsetXAD(oxad);
|
|
oxaddr = addressXAD(oxad);
|
|
xlen = lengthXAD(oxad);
|
|
|
|
/* validate extent offset */
|
|
offset = xoff << JFS_SBI(ip->i_sb)->l2bsize;
|
|
if (offset >= ip->i_size)
|
|
return -ESTALE; /* stale extent */
|
|
|
|
jfs_info("xtRelocate: xtype:%d xoff:0x%lx xlen:0x%x xaddr:0x%lx:0x%lx",
|
|
xtype, (ulong) xoff, xlen, (ulong) oxaddr, (ulong) nxaddr);
|
|
|
|
/*
|
|
* 1. get and validate the parent xtpage/xad entry
|
|
* covering the source extent to be relocated;
|
|
*/
|
|
if (xtype == DATAEXT) {
|
|
/* search in leaf entry */
|
|
rc = xtSearch(ip, xoff, NULL, &cmp, &btstack, 0);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* retrieve search result */
|
|
XT_GETSEARCH(ip, btstack.top, bn, pmp, pp, index);
|
|
|
|
if (cmp) {
|
|
XT_PUTPAGE(pmp);
|
|
return -ESTALE;
|
|
}
|
|
|
|
/* validate for exact match with a single entry */
|
|
xad = &pp->xad[index];
|
|
if (addressXAD(xad) != oxaddr || lengthXAD(xad) != xlen) {
|
|
XT_PUTPAGE(pmp);
|
|
return -ESTALE;
|
|
}
|
|
} else { /* (xtype == XTPAGE) */
|
|
|
|
/* search in internal entry */
|
|
rc = xtSearchNode(ip, oxad, &cmp, &btstack, 0);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* retrieve search result */
|
|
XT_GETSEARCH(ip, btstack.top, bn, pmp, pp, index);
|
|
|
|
if (cmp) {
|
|
XT_PUTPAGE(pmp);
|
|
return -ESTALE;
|
|
}
|
|
|
|
/* xtSearchNode() validated for exact match with a single entry
|
|
*/
|
|
xad = &pp->xad[index];
|
|
}
|
|
jfs_info("xtRelocate: parent xad entry validated.");
|
|
|
|
/*
|
|
* 2. relocate the extent
|
|
*/
|
|
if (xtype == DATAEXT) {
|
|
/* if the extent is allocated-but-not-recorded
|
|
* there is no real data to be moved in this extent,
|
|
*/
|
|
if (xad->flag & XAD_NOTRECORDED)
|
|
goto out;
|
|
else
|
|
/* release xtpage for cmRead()/xtLookup() */
|
|
XT_PUTPAGE(pmp);
|
|
|
|
/*
|
|
* cmRelocate()
|
|
*
|
|
* copy target data pages to be relocated;
|
|
*
|
|
* data extent must start at page boundary and
|
|
* multiple of page size (except the last data extent);
|
|
* read in each page of the source data extent into cbuf,
|
|
* update the cbuf extent descriptor of the page to be
|
|
* homeward bound to new dst data extent
|
|
* copy the data from the old extent to new extent.
|
|
* copy is essential for compressed files to avoid problems
|
|
* that can arise if there was a change in compression
|
|
* algorithms.
|
|
* it is a good strategy because it may disrupt cache
|
|
* policy to keep the pages in memory afterwards.
|
|
*/
|
|
offset = xoff << JFS_SBI(ip->i_sb)->l2bsize;
|
|
assert((offset & CM_OFFSET) == 0);
|
|
nbytes = xlen << JFS_SBI(ip->i_sb)->l2bsize;
|
|
pno = offset >> CM_L2BSIZE;
|
|
npages = (nbytes + (CM_BSIZE - 1)) >> CM_L2BSIZE;
|
|
/*
|
|
npages = ((offset + nbytes - 1) >> CM_L2BSIZE) -
|
|
(offset >> CM_L2BSIZE) + 1;
|
|
*/
|
|
sxaddr = oxaddr;
|
|
dxaddr = nxaddr;
|
|
|
|
/* process the request one cache buffer at a time */
|
|
for (nbrd = 0; nbrd < nbytes; nbrd += nb,
|
|
offset += nb, pno++, npages--) {
|
|
/* compute page size */
|
|
nb = min(nbytes - nbrd, CM_BSIZE);
|
|
|
|
/* get the cache buffer of the page */
|
|
if (rc = cmRead(ip, offset, npages, &cp))
|
|
break;
|
|
|
|
assert(addressPXD(&cp->cm_pxd) == sxaddr);
|
|
assert(!cp->cm_modified);
|
|
|
|
/* bind buffer with the new extent address */
|
|
nblks = nb >> JFS_IP(ip->i_sb)->l2bsize;
|
|
cmSetXD(ip, cp, pno, dxaddr, nblks);
|
|
|
|
/* release the cbuf, mark it as modified */
|
|
cmPut(cp, TRUE);
|
|
|
|
dxaddr += nblks;
|
|
sxaddr += nblks;
|
|
}
|
|
|
|
/* get back parent page */
|
|
if ((rc = xtSearch(ip, xoff, NULL, &cmp, &btstack, 0)))
|
|
return rc;
|
|
|
|
XT_GETSEARCH(ip, btstack.top, bn, pmp, pp, index);
|
|
jfs_info("xtRelocate: target data extent relocated.");
|
|
} else { /* (xtype == XTPAGE) */
|
|
|
|
/*
|
|
* read in the target xtpage from the source extent;
|
|
*/
|
|
XT_GETPAGE(ip, oxaddr, mp, PSIZE, p, rc);
|
|
if (rc) {
|
|
XT_PUTPAGE(pmp);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* read in sibling pages if any to update sibling pointers;
|
|
*/
|
|
rmp = NULL;
|
|
if (p->header.next) {
|
|
nextbn = le64_to_cpu(p->header.next);
|
|
XT_GETPAGE(ip, nextbn, rmp, PSIZE, rp, rc);
|
|
if (rc) {
|
|
XT_PUTPAGE(pmp);
|
|
XT_PUTPAGE(mp);
|
|
return (rc);
|
|
}
|
|
}
|
|
|
|
lmp = NULL;
|
|
if (p->header.prev) {
|
|
prevbn = le64_to_cpu(p->header.prev);
|
|
XT_GETPAGE(ip, prevbn, lmp, PSIZE, lp, rc);
|
|
if (rc) {
|
|
XT_PUTPAGE(pmp);
|
|
XT_PUTPAGE(mp);
|
|
if (rmp)
|
|
XT_PUTPAGE(rmp);
|
|
return (rc);
|
|
}
|
|
}
|
|
|
|
/* at this point, all xtpages to be updated are in memory */
|
|
|
|
/*
|
|
* update sibling pointers of sibling xtpages if any;
|
|
*/
|
|
if (lmp) {
|
|
BT_MARK_DIRTY(lmp, ip);
|
|
tlck =
|
|
txLock(tid, ip, lmp, tlckXTREE | tlckRELINK);
|
|
lp->header.next = cpu_to_le64(nxaddr);
|
|
XT_PUTPAGE(lmp);
|
|
}
|
|
|
|
if (rmp) {
|
|
BT_MARK_DIRTY(rmp, ip);
|
|
tlck =
|
|
txLock(tid, ip, rmp, tlckXTREE | tlckRELINK);
|
|
rp->header.prev = cpu_to_le64(nxaddr);
|
|
XT_PUTPAGE(rmp);
|
|
}
|
|
|
|
/*
|
|
* update the target xtpage to be relocated
|
|
*
|
|
* update the self address of the target page
|
|
* and write to destination extent;
|
|
* redo image covers the whole xtpage since it is new page
|
|
* to the destination extent;
|
|
* update of bmap for the free of source extent
|
|
* of the target xtpage itself:
|
|
* update of bmap for the allocation of destination extent
|
|
* of the target xtpage itself:
|
|
* update of bmap for the extents covered by xad entries in
|
|
* the target xtpage is not necessary since they are not
|
|
* updated;
|
|
* if not committed before this relocation,
|
|
* target page may contain XAD_NEW entries which must
|
|
* be scanned for bmap update (logredo() always
|
|
* scan xtpage REDOPAGE image for bmap update);
|
|
* if committed before this relocation (tlckRELOCATE),
|
|
* scan may be skipped by commit() and logredo();
|
|
*/
|
|
BT_MARK_DIRTY(mp, ip);
|
|
/* tlckNEW init xtlck->lwm.offset = XTENTRYSTART; */
|
|
tlck = txLock(tid, ip, mp, tlckXTREE | tlckNEW);
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
|
|
/* update the self address in the xtpage header */
|
|
pxd = &p->header.self;
|
|
PXDaddress(pxd, nxaddr);
|
|
|
|
/* linelock for the after image of the whole page */
|
|
xtlck->lwm.length =
|
|
le16_to_cpu(p->header.nextindex) - xtlck->lwm.offset;
|
|
|
|
/* update the buffer extent descriptor of target xtpage */
|
|
xsize = xlen << JFS_SBI(ip->i_sb)->l2bsize;
|
|
bmSetXD(mp, nxaddr, xsize);
|
|
|
|
/* unpin the target page to new homeward bound */
|
|
XT_PUTPAGE(mp);
|
|
jfs_info("xtRelocate: target xtpage relocated.");
|
|
}
|
|
|
|
/*
|
|
* 3. acquire maplock for the source extent to be freed;
|
|
*
|
|
* acquire a maplock saving the src relocated extent address;
|
|
* to free of the extent at commit time;
|
|
*/
|
|
out:
|
|
/* if DATAEXT relocation, write a LOG_UPDATEMAP record for
|
|
* free PXD of the source data extent (logredo() will update
|
|
* bmap for free of source data extent), and update bmap for
|
|
* free of the source data extent;
|
|
*/
|
|
if (xtype == DATAEXT)
|
|
tlck = txMaplock(tid, ip, tlckMAP);
|
|
/* if XTPAGE relocation, write a LOG_NOREDOPAGE record
|
|
* for the source xtpage (logredo() will init NoRedoPage
|
|
* filter and will also update bmap for free of the source
|
|
* xtpage), and update bmap for free of the source xtpage;
|
|
* N.B. We use tlckMAP instead of tlkcXTREE because there
|
|
* is no buffer associated with this lock since the buffer
|
|
* has been redirected to the target location.
|
|
*/
|
|
else /* (xtype == XTPAGE) */
|
|
tlck = txMaplock(tid, ip, tlckMAP | tlckRELOCATE);
|
|
|
|
pxdlock = (struct pxd_lock *) & tlck->lock;
|
|
pxdlock->flag = mlckFREEPXD;
|
|
PXDaddress(&pxdlock->pxd, oxaddr);
|
|
PXDlength(&pxdlock->pxd, xlen);
|
|
pxdlock->index = 1;
|
|
|
|
/*
|
|
* 4. update the parent xad entry for relocation;
|
|
*
|
|
* acquire tlck for the parent entry with XAD_NEW as entry
|
|
* update which will write LOG_REDOPAGE and update bmap for
|
|
* allocation of XAD_NEW destination extent;
|
|
*/
|
|
jfs_info("xtRelocate: update parent xad entry.");
|
|
BT_MARK_DIRTY(pmp, ip);
|
|
tlck = txLock(tid, ip, pmp, tlckXTREE | tlckGROW);
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
|
|
/* update the XAD with the new destination extent; */
|
|
xad = &pp->xad[index];
|
|
xad->flag |= XAD_NEW;
|
|
XADaddress(xad, nxaddr);
|
|
|
|
xtlck->lwm.offset = min(index, xtlck->lwm.offset);
|
|
xtlck->lwm.length = le16_to_cpu(pp->header.nextindex) -
|
|
xtlck->lwm.offset;
|
|
|
|
/* unpin the parent xtpage */
|
|
XT_PUTPAGE(pmp);
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
/*
|
|
* xtSearchNode()
|
|
*
|
|
* function: search for the internal xad entry covering specified extent.
|
|
* This function is mainly used by defragfs utility.
|
|
*
|
|
* parameters:
|
|
* ip - file object;
|
|
* xad - extent to find;
|
|
* cmpp - comparison result:
|
|
* btstack - traverse stack;
|
|
* flag - search process flag;
|
|
*
|
|
* returns:
|
|
* btstack contains (bn, index) of search path traversed to the entry.
|
|
* *cmpp is set to result of comparison with the entry returned.
|
|
* the page containing the entry is pinned at exit.
|
|
*/
|
|
static int xtSearchNode(struct inode *ip, xad_t * xad, /* required XAD entry */
|
|
int *cmpp, struct btstack * btstack, int flag)
|
|
{
|
|
int rc = 0;
|
|
s64 xoff, xaddr;
|
|
int xlen;
|
|
int cmp = 1; /* init for empty page */
|
|
s64 bn; /* block number */
|
|
struct metapage *mp; /* meta-page buffer */
|
|
xtpage_t *p; /* page */
|
|
int base, index, lim;
|
|
struct btframe *btsp;
|
|
s64 t64;
|
|
|
|
BT_CLR(btstack);
|
|
|
|
xoff = offsetXAD(xad);
|
|
xlen = lengthXAD(xad);
|
|
xaddr = addressXAD(xad);
|
|
|
|
/*
|
|
* search down tree from root:
|
|
*
|
|
* between two consecutive entries of <Ki, Pi> and <Kj, Pj> of
|
|
* internal page, child page Pi contains entry with k, Ki <= K < Kj.
|
|
*
|
|
* if entry with search key K is not found
|
|
* internal page search find the entry with largest key Ki
|
|
* less than K which point to the child page to search;
|
|
* leaf page search find the entry with smallest key Kj
|
|
* greater than K so that the returned index is the position of
|
|
* the entry to be shifted right for insertion of new entry.
|
|
* for empty tree, search key is greater than any key of the tree.
|
|
*
|
|
* by convention, root bn = 0.
|
|
*/
|
|
for (bn = 0;;) {
|
|
/* get/pin the page to search */
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
if (p->header.flag & BT_LEAF) {
|
|
XT_PUTPAGE(mp);
|
|
return -ESTALE;
|
|
}
|
|
|
|
lim = le16_to_cpu(p->header.nextindex) - XTENTRYSTART;
|
|
|
|
/*
|
|
* binary search with search key K on the current page
|
|
*/
|
|
for (base = XTENTRYSTART; lim; lim >>= 1) {
|
|
index = base + (lim >> 1);
|
|
|
|
XT_CMP(cmp, xoff, &p->xad[index], t64);
|
|
if (cmp == 0) {
|
|
/*
|
|
* search hit
|
|
*
|
|
* verify for exact match;
|
|
*/
|
|
if (xaddr == addressXAD(&p->xad[index]) &&
|
|
xoff == offsetXAD(&p->xad[index])) {
|
|
*cmpp = cmp;
|
|
|
|
/* save search result */
|
|
btsp = btstack->top;
|
|
btsp->bn = bn;
|
|
btsp->index = index;
|
|
btsp->mp = mp;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* descend/search its child page */
|
|
goto next;
|
|
}
|
|
|
|
if (cmp > 0) {
|
|
base = index + 1;
|
|
--lim;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* search miss - non-leaf page:
|
|
*
|
|
* base is the smallest index with key (Kj) greater than
|
|
* search key (K) and may be zero or maxentry index.
|
|
* if base is non-zero, decrement base by one to get the parent
|
|
* entry of the child page to search.
|
|
*/
|
|
index = base ? base - 1 : base;
|
|
|
|
/*
|
|
* go down to child page
|
|
*/
|
|
next:
|
|
/* get the child page block number */
|
|
bn = addressXAD(&p->xad[index]);
|
|
|
|
/* unpin the parent page */
|
|
XT_PUTPAGE(mp);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* xtRelink()
|
|
*
|
|
* function:
|
|
* link around a freed page.
|
|
*
|
|
* Parameter:
|
|
* int tid,
|
|
* struct inode *ip,
|
|
* xtpage_t *p)
|
|
*
|
|
* returns:
|
|
*/
|
|
static int xtRelink(tid_t tid, struct inode *ip, xtpage_t * p)
|
|
{
|
|
int rc = 0;
|
|
struct metapage *mp;
|
|
s64 nextbn, prevbn;
|
|
struct tlock *tlck;
|
|
|
|
nextbn = le64_to_cpu(p->header.next);
|
|
prevbn = le64_to_cpu(p->header.prev);
|
|
|
|
/* update prev pointer of the next page */
|
|
if (nextbn != 0) {
|
|
XT_GETPAGE(ip, nextbn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/*
|
|
* acquire a transaction lock on the page;
|
|
*
|
|
* action: update prev pointer;
|
|
*/
|
|
BT_MARK_DIRTY(mp, ip);
|
|
tlck = txLock(tid, ip, mp, tlckXTREE | tlckRELINK);
|
|
|
|
/* the page may already have been tlock'd */
|
|
|
|
p->header.prev = cpu_to_le64(prevbn);
|
|
|
|
XT_PUTPAGE(mp);
|
|
}
|
|
|
|
/* update next pointer of the previous page */
|
|
if (prevbn != 0) {
|
|
XT_GETPAGE(ip, prevbn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/*
|
|
* acquire a transaction lock on the page;
|
|
*
|
|
* action: update next pointer;
|
|
*/
|
|
BT_MARK_DIRTY(mp, ip);
|
|
tlck = txLock(tid, ip, mp, tlckXTREE | tlckRELINK);
|
|
|
|
/* the page may already have been tlock'd */
|
|
|
|
p->header.next = le64_to_cpu(nextbn);
|
|
|
|
XT_PUTPAGE(mp);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif /* _STILL_TO_PORT */
|
|
|
|
|
|
/*
|
|
* xtInitRoot()
|
|
*
|
|
* initialize file root (inline in inode)
|
|
*/
|
|
void xtInitRoot(tid_t tid, struct inode *ip)
|
|
{
|
|
xtpage_t *p;
|
|
|
|
/*
|
|
* acquire a transaction lock on the root
|
|
*
|
|
* action:
|
|
*/
|
|
txLock(tid, ip, (struct metapage *) &JFS_IP(ip)->bxflag,
|
|
tlckXTREE | tlckNEW);
|
|
p = &JFS_IP(ip)->i_xtroot;
|
|
|
|
p->header.flag = DXD_INDEX | BT_ROOT | BT_LEAF;
|
|
p->header.nextindex = cpu_to_le16(XTENTRYSTART);
|
|
|
|
if (S_ISDIR(ip->i_mode))
|
|
p->header.maxentry = cpu_to_le16(XTROOTINITSLOT_DIR);
|
|
else {
|
|
p->header.maxentry = cpu_to_le16(XTROOTINITSLOT);
|
|
ip->i_size = 0;
|
|
}
|
|
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
* We can run into a deadlock truncating a file with a large number of
|
|
* xtree pages (large fragmented file). A robust fix would entail a
|
|
* reservation system where we would reserve a number of metadata pages
|
|
* and tlocks which we would be guaranteed without a deadlock. Without
|
|
* this, a partial fix is to limit number of metadata pages we will lock
|
|
* in a single transaction. Currently we will truncate the file so that
|
|
* no more than 50 leaf pages will be locked. The caller of xtTruncate
|
|
* will be responsible for ensuring that the current transaction gets
|
|
* committed, and that subsequent transactions are created to truncate
|
|
* the file further if needed.
|
|
*/
|
|
#define MAX_TRUNCATE_LEAVES 50
|
|
|
|
/*
|
|
* xtTruncate()
|
|
*
|
|
* function:
|
|
* traverse for truncation logging backward bottom up;
|
|
* terminate at the last extent entry at the current subtree
|
|
* root page covering new down size.
|
|
* truncation may occur within the last extent entry.
|
|
*
|
|
* parameter:
|
|
* int tid,
|
|
* struct inode *ip,
|
|
* s64 newsize,
|
|
* int type) {PWMAP, PMAP, WMAP; DELETE, TRUNCATE}
|
|
*
|
|
* return:
|
|
*
|
|
* note:
|
|
* PWMAP:
|
|
* 1. truncate (non-COMMIT_NOLINK file)
|
|
* by jfs_truncate() or jfs_open(O_TRUNC):
|
|
* xtree is updated;
|
|
* 2. truncate index table of directory when last entry removed
|
|
* map update via tlock at commit time;
|
|
* PMAP:
|
|
* Call xtTruncate_pmap instead
|
|
* WMAP:
|
|
* 1. remove (free zero link count) on last reference release
|
|
* (pmap has been freed at commit zero link count);
|
|
* 2. truncate (COMMIT_NOLINK file, i.e., tmp file):
|
|
* xtree is updated;
|
|
* map update directly at truncation time;
|
|
*
|
|
* if (DELETE)
|
|
* no LOG_NOREDOPAGE is required (NOREDOFILE is sufficient);
|
|
* else if (TRUNCATE)
|
|
* must write LOG_NOREDOPAGE for deleted index page;
|
|
*
|
|
* pages may already have been tlocked by anonymous transactions
|
|
* during file growth (i.e., write) before truncation;
|
|
*
|
|
* except last truncated entry, deleted entries remains as is
|
|
* in the page (nextindex is updated) for other use
|
|
* (e.g., log/update allocation map): this avoid copying the page
|
|
* info but delay free of pages;
|
|
*
|
|
*/
|
|
s64 xtTruncate(tid_t tid, struct inode *ip, s64 newsize, int flag)
|
|
{
|
|
int rc = 0;
|
|
s64 teof;
|
|
struct metapage *mp;
|
|
xtpage_t *p;
|
|
s64 bn;
|
|
int index, nextindex;
|
|
xad_t *xad;
|
|
s64 xoff, xaddr;
|
|
int xlen, len, freexlen;
|
|
struct btstack btstack;
|
|
struct btframe *parent;
|
|
struct tblock *tblk = NULL;
|
|
struct tlock *tlck = NULL;
|
|
struct xtlock *xtlck = NULL;
|
|
struct xdlistlock xadlock; /* maplock for COMMIT_WMAP */
|
|
struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
|
|
s64 nfreed;
|
|
int freed, log;
|
|
int locked_leaves = 0;
|
|
|
|
/* save object truncation type */
|
|
if (tid) {
|
|
tblk = tid_to_tblock(tid);
|
|
tblk->xflag |= flag;
|
|
}
|
|
|
|
nfreed = 0;
|
|
|
|
flag &= COMMIT_MAP;
|
|
assert(flag != COMMIT_PMAP);
|
|
|
|
if (flag == COMMIT_PWMAP)
|
|
log = 1;
|
|
else {
|
|
log = 0;
|
|
xadlock.flag = mlckFREEXADLIST;
|
|
xadlock.index = 1;
|
|
}
|
|
|
|
/*
|
|
* if the newsize is not an integral number of pages,
|
|
* the file between newsize and next page boundary will
|
|
* be cleared.
|
|
* if truncating into a file hole, it will cause
|
|
* a full block to be allocated for the logical block.
|
|
*/
|
|
|
|
/*
|
|
* release page blocks of truncated region <teof, eof>
|
|
*
|
|
* free the data blocks from the leaf index blocks.
|
|
* delete the parent index entries corresponding to
|
|
* the freed child data/index blocks.
|
|
* free the index blocks themselves which aren't needed
|
|
* in new sized file.
|
|
*
|
|
* index blocks are updated only if the blocks are to be
|
|
* retained in the new sized file.
|
|
* if type is PMAP, the data and index pages are NOT
|
|
* freed, and the data and index blocks are NOT freed
|
|
* from working map.
|
|
* (this will allow continued access of data/index of
|
|
* temporary file (zerolink count file truncated to zero-length)).
|
|
*/
|
|
teof = (newsize + (JFS_SBI(ip->i_sb)->bsize - 1)) >>
|
|
JFS_SBI(ip->i_sb)->l2bsize;
|
|
|
|
/* clear stack */
|
|
BT_CLR(&btstack);
|
|
|
|
/*
|
|
* start with root
|
|
*
|
|
* root resides in the inode
|
|
*/
|
|
bn = 0;
|
|
|
|
/*
|
|
* first access of each page:
|
|
*/
|
|
getPage:
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* process entries backward from last index */
|
|
index = le16_to_cpu(p->header.nextindex) - 1;
|
|
|
|
|
|
/* Since this is the rightmost page at this level, and we may have
|
|
* already freed a page that was formerly to the right, let's make
|
|
* sure that the next pointer is zero.
|
|
*/
|
|
if (p->header.next) {
|
|
if (log)
|
|
/*
|
|
* Make sure this change to the header is logged.
|
|
* If we really truncate this leaf, the flag
|
|
* will be changed to tlckTRUNCATE
|
|
*/
|
|
tlck = txLock(tid, ip, mp, tlckXTREE|tlckGROW);
|
|
BT_MARK_DIRTY(mp, ip);
|
|
p->header.next = 0;
|
|
}
|
|
|
|
if (p->header.flag & BT_INTERNAL)
|
|
goto getChild;
|
|
|
|
/*
|
|
* leaf page
|
|
*/
|
|
freed = 0;
|
|
|
|
/* does region covered by leaf page precede Teof ? */
|
|
xad = &p->xad[index];
|
|
xoff = offsetXAD(xad);
|
|
xlen = lengthXAD(xad);
|
|
if (teof >= xoff + xlen) {
|
|
XT_PUTPAGE(mp);
|
|
goto getParent;
|
|
}
|
|
|
|
/* (re)acquire tlock of the leaf page */
|
|
if (log) {
|
|
if (++locked_leaves > MAX_TRUNCATE_LEAVES) {
|
|
/*
|
|
* We need to limit the size of the transaction
|
|
* to avoid exhausting pagecache & tlocks
|
|
*/
|
|
XT_PUTPAGE(mp);
|
|
newsize = (xoff + xlen) << JFS_SBI(ip->i_sb)->l2bsize;
|
|
goto getParent;
|
|
}
|
|
tlck = txLock(tid, ip, mp, tlckXTREE);
|
|
tlck->type = tlckXTREE | tlckTRUNCATE;
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
xtlck->hwm.offset = le16_to_cpu(p->header.nextindex) - 1;
|
|
}
|
|
BT_MARK_DIRTY(mp, ip);
|
|
|
|
/*
|
|
* scan backward leaf page entries
|
|
*/
|
|
for (; index >= XTENTRYSTART; index--) {
|
|
xad = &p->xad[index];
|
|
xoff = offsetXAD(xad);
|
|
xlen = lengthXAD(xad);
|
|
xaddr = addressXAD(xad);
|
|
|
|
/*
|
|
* The "data" for a directory is indexed by the block
|
|
* device's address space. This metadata must be invalidated
|
|
* here
|
|
*/
|
|
if (S_ISDIR(ip->i_mode) && (teof == 0))
|
|
invalidate_xad_metapages(ip, *xad);
|
|
/*
|
|
* entry beyond eof: continue scan of current page
|
|
* xad
|
|
* ---|---=======------->
|
|
* eof
|
|
*/
|
|
if (teof < xoff) {
|
|
nfreed += xlen;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* (xoff <= teof): last entry to be deleted from page;
|
|
* If other entries remain in page: keep and update the page.
|
|
*/
|
|
|
|
/*
|
|
* eof == entry_start: delete the entry
|
|
* xad
|
|
* -------|=======------->
|
|
* eof
|
|
*
|
|
*/
|
|
if (teof == xoff) {
|
|
nfreed += xlen;
|
|
|
|
if (index == XTENTRYSTART)
|
|
break;
|
|
|
|
nextindex = index;
|
|
}
|
|
/*
|
|
* eof within the entry: truncate the entry.
|
|
* xad
|
|
* -------===|===------->
|
|
* eof
|
|
*/
|
|
else if (teof < xoff + xlen) {
|
|
/* update truncated entry */
|
|
len = teof - xoff;
|
|
freexlen = xlen - len;
|
|
XADlength(xad, len);
|
|
|
|
/* save pxd of truncated extent in tlck */
|
|
xaddr += len;
|
|
if (log) { /* COMMIT_PWMAP */
|
|
xtlck->lwm.offset = (xtlck->lwm.offset) ?
|
|
min(index, (int)xtlck->lwm.offset) : index;
|
|
xtlck->lwm.length = index + 1 -
|
|
xtlck->lwm.offset;
|
|
xtlck->twm.offset = index;
|
|
pxdlock = (struct pxd_lock *) & xtlck->pxdlock;
|
|
pxdlock->flag = mlckFREEPXD;
|
|
PXDaddress(&pxdlock->pxd, xaddr);
|
|
PXDlength(&pxdlock->pxd, freexlen);
|
|
}
|
|
/* free truncated extent */
|
|
else { /* COMMIT_WMAP */
|
|
|
|
pxdlock = (struct pxd_lock *) & xadlock;
|
|
pxdlock->flag = mlckFREEPXD;
|
|
PXDaddress(&pxdlock->pxd, xaddr);
|
|
PXDlength(&pxdlock->pxd, freexlen);
|
|
txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
|
|
|
|
/* reset map lock */
|
|
xadlock.flag = mlckFREEXADLIST;
|
|
}
|
|
|
|
/* current entry is new last entry; */
|
|
nextindex = index + 1;
|
|
|
|
nfreed += freexlen;
|
|
}
|
|
/*
|
|
* eof beyond the entry:
|
|
* xad
|
|
* -------=======---|--->
|
|
* eof
|
|
*/
|
|
else { /* (xoff + xlen < teof) */
|
|
|
|
nextindex = index + 1;
|
|
}
|
|
|
|
if (nextindex < le16_to_cpu(p->header.nextindex)) {
|
|
if (!log) { /* COMMIT_WAMP */
|
|
xadlock.xdlist = &p->xad[nextindex];
|
|
xadlock.count =
|
|
le16_to_cpu(p->header.nextindex) -
|
|
nextindex;
|
|
txFreeMap(ip, (struct maplock *) & xadlock,
|
|
NULL, COMMIT_WMAP);
|
|
}
|
|
p->header.nextindex = cpu_to_le16(nextindex);
|
|
}
|
|
|
|
XT_PUTPAGE(mp);
|
|
|
|
/* assert(freed == 0); */
|
|
goto getParent;
|
|
} /* end scan of leaf page entries */
|
|
|
|
freed = 1;
|
|
|
|
/*
|
|
* leaf page become empty: free the page if type != PMAP
|
|
*/
|
|
if (log) { /* COMMIT_PWMAP */
|
|
/* txCommit() with tlckFREE:
|
|
* free data extents covered by leaf [XTENTRYSTART:hwm);
|
|
* invalidate leaf if COMMIT_PWMAP;
|
|
* if (TRUNCATE), will write LOG_NOREDOPAGE;
|
|
*/
|
|
tlck->type = tlckXTREE | tlckFREE;
|
|
} else { /* COMMIT_WAMP */
|
|
|
|
/* free data extents covered by leaf */
|
|
xadlock.xdlist = &p->xad[XTENTRYSTART];
|
|
xadlock.count =
|
|
le16_to_cpu(p->header.nextindex) - XTENTRYSTART;
|
|
txFreeMap(ip, (struct maplock *) & xadlock, NULL, COMMIT_WMAP);
|
|
}
|
|
|
|
if (p->header.flag & BT_ROOT) {
|
|
p->header.flag &= ~BT_INTERNAL;
|
|
p->header.flag |= BT_LEAF;
|
|
p->header.nextindex = cpu_to_le16(XTENTRYSTART);
|
|
|
|
XT_PUTPAGE(mp); /* debug */
|
|
goto out;
|
|
} else {
|
|
if (log) { /* COMMIT_PWMAP */
|
|
/* page will be invalidated at tx completion
|
|
*/
|
|
XT_PUTPAGE(mp);
|
|
} else { /* COMMIT_WMAP */
|
|
|
|
if (mp->lid)
|
|
lid_to_tlock(mp->lid)->flag |= tlckFREELOCK;
|
|
|
|
/* invalidate empty leaf page */
|
|
discard_metapage(mp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* the leaf page become empty: delete the parent entry
|
|
* for the leaf page if the parent page is to be kept
|
|
* in the new sized file.
|
|
*/
|
|
|
|
/*
|
|
* go back up to the parent page
|
|
*/
|
|
getParent:
|
|
/* pop/restore parent entry for the current child page */
|
|
if ((parent = BT_POP(&btstack)) == NULL)
|
|
/* current page must have been root */
|
|
goto out;
|
|
|
|
/* get back the parent page */
|
|
bn = parent->bn;
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
index = parent->index;
|
|
|
|
/*
|
|
* child page was not empty:
|
|
*/
|
|
if (freed == 0) {
|
|
/* has any entry deleted from parent ? */
|
|
if (index < le16_to_cpu(p->header.nextindex) - 1) {
|
|
/* (re)acquire tlock on the parent page */
|
|
if (log) { /* COMMIT_PWMAP */
|
|
/* txCommit() with tlckTRUNCATE:
|
|
* free child extents covered by parent [);
|
|
*/
|
|
tlck = txLock(tid, ip, mp, tlckXTREE);
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
if (!(tlck->type & tlckTRUNCATE)) {
|
|
xtlck->hwm.offset =
|
|
le16_to_cpu(p->header.
|
|
nextindex) - 1;
|
|
tlck->type =
|
|
tlckXTREE | tlckTRUNCATE;
|
|
}
|
|
} else { /* COMMIT_WMAP */
|
|
|
|
/* free child extents covered by parent */
|
|
xadlock.xdlist = &p->xad[index + 1];
|
|
xadlock.count =
|
|
le16_to_cpu(p->header.nextindex) -
|
|
index - 1;
|
|
txFreeMap(ip, (struct maplock *) & xadlock,
|
|
NULL, COMMIT_WMAP);
|
|
}
|
|
BT_MARK_DIRTY(mp, ip);
|
|
|
|
p->header.nextindex = cpu_to_le16(index + 1);
|
|
}
|
|
XT_PUTPAGE(mp);
|
|
goto getParent;
|
|
}
|
|
|
|
/*
|
|
* child page was empty:
|
|
*/
|
|
nfreed += lengthXAD(&p->xad[index]);
|
|
|
|
/*
|
|
* During working map update, child page's tlock must be handled
|
|
* before parent's. This is because the parent's tlock will cause
|
|
* the child's disk space to be marked available in the wmap, so
|
|
* it's important that the child page be released by that time.
|
|
*
|
|
* ToDo: tlocks should be on doubly-linked list, so we can
|
|
* quickly remove it and add it to the end.
|
|
*/
|
|
|
|
/*
|
|
* Move parent page's tlock to the end of the tid's tlock list
|
|
*/
|
|
if (log && mp->lid && (tblk->last != mp->lid) &&
|
|
lid_to_tlock(mp->lid)->tid) {
|
|
lid_t lid = mp->lid;
|
|
struct tlock *prev;
|
|
|
|
tlck = lid_to_tlock(lid);
|
|
|
|
if (tblk->next == lid)
|
|
tblk->next = tlck->next;
|
|
else {
|
|
for (prev = lid_to_tlock(tblk->next);
|
|
prev->next != lid;
|
|
prev = lid_to_tlock(prev->next)) {
|
|
assert(prev->next);
|
|
}
|
|
prev->next = tlck->next;
|
|
}
|
|
lid_to_tlock(tblk->last)->next = lid;
|
|
tlck->next = 0;
|
|
tblk->last = lid;
|
|
}
|
|
|
|
/*
|
|
* parent page become empty: free the page
|
|
*/
|
|
if (index == XTENTRYSTART) {
|
|
if (log) { /* COMMIT_PWMAP */
|
|
/* txCommit() with tlckFREE:
|
|
* free child extents covered by parent;
|
|
* invalidate parent if COMMIT_PWMAP;
|
|
*/
|
|
tlck = txLock(tid, ip, mp, tlckXTREE);
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
xtlck->hwm.offset =
|
|
le16_to_cpu(p->header.nextindex) - 1;
|
|
tlck->type = tlckXTREE | tlckFREE;
|
|
} else { /* COMMIT_WMAP */
|
|
|
|
/* free child extents covered by parent */
|
|
xadlock.xdlist = &p->xad[XTENTRYSTART];
|
|
xadlock.count =
|
|
le16_to_cpu(p->header.nextindex) -
|
|
XTENTRYSTART;
|
|
txFreeMap(ip, (struct maplock *) & xadlock, NULL,
|
|
COMMIT_WMAP);
|
|
}
|
|
BT_MARK_DIRTY(mp, ip);
|
|
|
|
if (p->header.flag & BT_ROOT) {
|
|
p->header.flag &= ~BT_INTERNAL;
|
|
p->header.flag |= BT_LEAF;
|
|
p->header.nextindex = cpu_to_le16(XTENTRYSTART);
|
|
if (le16_to_cpu(p->header.maxentry) == XTROOTMAXSLOT) {
|
|
/*
|
|
* Shrink root down to allow inline
|
|
* EA (otherwise fsck complains)
|
|
*/
|
|
p->header.maxentry =
|
|
cpu_to_le16(XTROOTINITSLOT);
|
|
JFS_IP(ip)->mode2 |= INLINEEA;
|
|
}
|
|
|
|
XT_PUTPAGE(mp); /* debug */
|
|
goto out;
|
|
} else {
|
|
if (log) { /* COMMIT_PWMAP */
|
|
/* page will be invalidated at tx completion
|
|
*/
|
|
XT_PUTPAGE(mp);
|
|
} else { /* COMMIT_WMAP */
|
|
|
|
if (mp->lid)
|
|
lid_to_tlock(mp->lid)->flag |=
|
|
tlckFREELOCK;
|
|
|
|
/* invalidate parent page */
|
|
discard_metapage(mp);
|
|
}
|
|
|
|
/* parent has become empty and freed:
|
|
* go back up to its parent page
|
|
*/
|
|
/* freed = 1; */
|
|
goto getParent;
|
|
}
|
|
}
|
|
/*
|
|
* parent page still has entries for front region;
|
|
*/
|
|
else {
|
|
/* try truncate region covered by preceding entry
|
|
* (process backward)
|
|
*/
|
|
index--;
|
|
|
|
/* go back down to the child page corresponding
|
|
* to the entry
|
|
*/
|
|
goto getChild;
|
|
}
|
|
|
|
/*
|
|
* internal page: go down to child page of current entry
|
|
*/
|
|
getChild:
|
|
/* save current parent entry for the child page */
|
|
BT_PUSH(&btstack, bn, index);
|
|
|
|
/* get child page */
|
|
xad = &p->xad[index];
|
|
bn = addressXAD(xad);
|
|
|
|
/*
|
|
* first access of each internal entry:
|
|
*/
|
|
/* release parent page */
|
|
XT_PUTPAGE(mp);
|
|
|
|
/* process the child page */
|
|
goto getPage;
|
|
|
|
out:
|
|
/*
|
|
* update file resource stat
|
|
*/
|
|
/* set size
|
|
*/
|
|
if (S_ISDIR(ip->i_mode) && !newsize)
|
|
ip->i_size = 1; /* fsck hates zero-length directories */
|
|
else
|
|
ip->i_size = newsize;
|
|
|
|
/* update quota allocation to reflect freed blocks */
|
|
DQUOT_FREE_BLOCK(ip, nfreed);
|
|
|
|
/*
|
|
* free tlock of invalidated pages
|
|
*/
|
|
if (flag == COMMIT_WMAP)
|
|
txFreelock(ip);
|
|
|
|
return newsize;
|
|
}
|
|
|
|
|
|
/*
|
|
* xtTruncate_pmap()
|
|
*
|
|
* function:
|
|
* Perform truncate to zero lenghth for deleted file, leaving the
|
|
* the xtree and working map untouched. This allows the file to
|
|
* be accessed via open file handles, while the delete of the file
|
|
* is committed to disk.
|
|
*
|
|
* parameter:
|
|
* tid_t tid,
|
|
* struct inode *ip,
|
|
* s64 committed_size)
|
|
*
|
|
* return: new committed size
|
|
*
|
|
* note:
|
|
*
|
|
* To avoid deadlock by holding too many transaction locks, the
|
|
* truncation may be broken up into multiple transactions.
|
|
* The committed_size keeps track of part of the file has been
|
|
* freed from the pmaps.
|
|
*/
|
|
s64 xtTruncate_pmap(tid_t tid, struct inode *ip, s64 committed_size)
|
|
{
|
|
s64 bn;
|
|
struct btstack btstack;
|
|
int cmp;
|
|
int index;
|
|
int locked_leaves = 0;
|
|
struct metapage *mp;
|
|
xtpage_t *p;
|
|
struct btframe *parent;
|
|
int rc;
|
|
struct tblock *tblk;
|
|
struct tlock *tlck = NULL;
|
|
xad_t *xad;
|
|
int xlen;
|
|
s64 xoff;
|
|
struct xtlock *xtlck = NULL;
|
|
|
|
/* save object truncation type */
|
|
tblk = tid_to_tblock(tid);
|
|
tblk->xflag |= COMMIT_PMAP;
|
|
|
|
/* clear stack */
|
|
BT_CLR(&btstack);
|
|
|
|
if (committed_size) {
|
|
xoff = (committed_size >> JFS_SBI(ip->i_sb)->l2bsize) - 1;
|
|
rc = xtSearch(ip, xoff, NULL, &cmp, &btstack, 0);
|
|
if (rc)
|
|
return rc;
|
|
|
|
XT_GETSEARCH(ip, btstack.top, bn, mp, p, index);
|
|
|
|
if (cmp != 0) {
|
|
XT_PUTPAGE(mp);
|
|
jfs_error(ip->i_sb,
|
|
"xtTruncate_pmap: did not find extent");
|
|
return -EIO;
|
|
}
|
|
} else {
|
|
/*
|
|
* start with root
|
|
*
|
|
* root resides in the inode
|
|
*/
|
|
bn = 0;
|
|
|
|
/*
|
|
* first access of each page:
|
|
*/
|
|
getPage:
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* process entries backward from last index */
|
|
index = le16_to_cpu(p->header.nextindex) - 1;
|
|
|
|
if (p->header.flag & BT_INTERNAL)
|
|
goto getChild;
|
|
}
|
|
|
|
/*
|
|
* leaf page
|
|
*/
|
|
|
|
if (++locked_leaves > MAX_TRUNCATE_LEAVES) {
|
|
/*
|
|
* We need to limit the size of the transaction
|
|
* to avoid exhausting pagecache & tlocks
|
|
*/
|
|
xad = &p->xad[index];
|
|
xoff = offsetXAD(xad);
|
|
xlen = lengthXAD(xad);
|
|
XT_PUTPAGE(mp);
|
|
return (xoff + xlen) << JFS_SBI(ip->i_sb)->l2bsize;
|
|
}
|
|
tlck = txLock(tid, ip, mp, tlckXTREE);
|
|
tlck->type = tlckXTREE | tlckFREE;
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
xtlck->hwm.offset = index;
|
|
|
|
|
|
XT_PUTPAGE(mp);
|
|
|
|
/*
|
|
* go back up to the parent page
|
|
*/
|
|
getParent:
|
|
/* pop/restore parent entry for the current child page */
|
|
if ((parent = BT_POP(&btstack)) == NULL)
|
|
/* current page must have been root */
|
|
goto out;
|
|
|
|
/* get back the parent page */
|
|
bn = parent->bn;
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
index = parent->index;
|
|
|
|
/*
|
|
* parent page become empty: free the page
|
|
*/
|
|
if (index == XTENTRYSTART) {
|
|
/* txCommit() with tlckFREE:
|
|
* free child extents covered by parent;
|
|
* invalidate parent if COMMIT_PWMAP;
|
|
*/
|
|
tlck = txLock(tid, ip, mp, tlckXTREE);
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
|
xtlck->hwm.offset =
|
|
le16_to_cpu(p->header.nextindex) - 1;
|
|
tlck->type = tlckXTREE | tlckFREE;
|
|
|
|
XT_PUTPAGE(mp);
|
|
|
|
if (p->header.flag & BT_ROOT) {
|
|
|
|
goto out;
|
|
} else {
|
|
goto getParent;
|
|
}
|
|
}
|
|
/*
|
|
* parent page still has entries for front region;
|
|
*/
|
|
else
|
|
index--;
|
|
/*
|
|
* internal page: go down to child page of current entry
|
|
*/
|
|
getChild:
|
|
/* save current parent entry for the child page */
|
|
BT_PUSH(&btstack, bn, index);
|
|
|
|
/* get child page */
|
|
xad = &p->xad[index];
|
|
bn = addressXAD(xad);
|
|
|
|
/*
|
|
* first access of each internal entry:
|
|
*/
|
|
/* release parent page */
|
|
XT_PUTPAGE(mp);
|
|
|
|
/* process the child page */
|
|
goto getPage;
|
|
|
|
out:
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_JFS_STATISTICS
|
|
int jfs_xtstat_read(char *buffer, char **start, off_t offset, int length,
|
|
int *eof, void *data)
|
|
{
|
|
int len = 0;
|
|
off_t begin;
|
|
|
|
len += sprintf(buffer,
|
|
"JFS Xtree statistics\n"
|
|
"====================\n"
|
|
"searches = %d\n"
|
|
"fast searches = %d\n"
|
|
"splits = %d\n",
|
|
xtStat.search,
|
|
xtStat.fastSearch,
|
|
xtStat.split);
|
|
|
|
begin = offset;
|
|
*start = buffer + begin;
|
|
len -= begin;
|
|
|
|
if (len > length)
|
|
len = length;
|
|
else
|
|
*eof = 1;
|
|
|
|
if (len < 0)
|
|
len = 0;
|
|
|
|
return len;
|
|
}
|
|
#endif
|