4563 lines
100 KiB
C
4563 lines
100 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) International Business Machines Corp., 2000-2004
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*/
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/*
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* jfs_dtree.c: directory B+-tree manager
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*
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* B+-tree with variable length key directory:
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*
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* each directory page is structured as an array of 32-byte
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* directory entry slots initialized as a freelist
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* to avoid search/compaction of free space at insertion.
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* when an entry is inserted, a number of slots are allocated
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* from the freelist as required to store variable length data
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* of the entry; when the entry is deleted, slots of the entry
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* are returned to freelist.
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*
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* leaf entry stores full name as key and file serial number
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* (aka inode number) as data.
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* internal/router entry stores sufffix compressed name
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* as key and simple extent descriptor as data.
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*
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* each directory page maintains a sorted entry index table
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* which stores the start slot index of sorted entries
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* to allow binary search on the table.
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*
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* directory starts as a root/leaf page in on-disk inode
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* inline data area.
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* when it becomes full, it starts a leaf of a external extent
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* of length of 1 block. each time the first leaf becomes full,
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* it is extended rather than split (its size is doubled),
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* until its length becoms 4 KBytes, from then the extent is split
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* with new 4 Kbyte extent when it becomes full
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* to reduce external fragmentation of small directories.
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*
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* blah, blah, blah, for linear scan of directory in pieces by
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* readdir().
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*
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*
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* case-insensitive directory file system
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*
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* names are stored in case-sensitive way in leaf entry.
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* but stored, searched and compared in case-insensitive (uppercase) order
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* (i.e., both search key and entry key are folded for search/compare):
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* (note that case-sensitive order is BROKEN in storage, e.g.,
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* sensitive: Ad, aB, aC, aD -> insensitive: aB, aC, aD, Ad
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*
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* entries which folds to the same key makes up a equivalent class
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* whose members are stored as contiguous cluster (may cross page boundary)
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* but whose order is arbitrary and acts as duplicate, e.g.,
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* abc, Abc, aBc, abC)
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*
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* once match is found at leaf, requires scan forward/backward
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* either for, in case-insensitive search, duplicate
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* or for, in case-sensitive search, for exact match
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*
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* router entry must be created/stored in case-insensitive way
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* in internal entry:
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* (right most key of left page and left most key of right page
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* are folded, and its suffix compression is propagated as router
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* key in parent)
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* (e.g., if split occurs <abc> and <aBd>, <ABD> trather than <aB>
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* should be made the router key for the split)
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*
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* case-insensitive search:
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*
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* fold search key;
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*
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* case-insensitive search of B-tree:
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* for internal entry, router key is already folded;
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* for leaf entry, fold the entry key before comparison.
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*
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* if (leaf entry case-insensitive match found)
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* if (next entry satisfies case-insensitive match)
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* return EDUPLICATE;
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* if (prev entry satisfies case-insensitive match)
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* return EDUPLICATE;
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* return match;
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* else
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* return no match;
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*
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* serialization:
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* target directory inode lock is being held on entry/exit
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* of all main directory service routines.
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*
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* log based recovery:
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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 <linux/slab.h>
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#include "jfs_incore.h"
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#include "jfs_superblock.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_unicode.h"
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#include "jfs_debug.h"
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/* dtree split parameter */
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struct dtsplit {
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struct metapage *mp;
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s16 index;
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s16 nslot;
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struct component_name *key;
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ddata_t *data;
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struct pxdlist *pxdlist;
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};
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#define DT_PAGE(IP, MP) BT_PAGE(IP, MP, dtpage_t, i_dtroot)
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/* get page buffer for specified block address */
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#define DT_GETPAGE(IP, BN, MP, SIZE, P, RC) \
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do { \
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BT_GETPAGE(IP, BN, MP, dtpage_t, SIZE, P, RC, i_dtroot); \
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if (!(RC)) { \
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if (((P)->header.nextindex > \
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(((BN) == 0) ? DTROOTMAXSLOT : (P)->header.maxslot)) || \
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((BN) && ((P)->header.maxslot > DTPAGEMAXSLOT))) { \
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BT_PUTPAGE(MP); \
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jfs_error((IP)->i_sb, \
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"DT_GETPAGE: dtree page corrupt\n"); \
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MP = NULL; \
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RC = -EIO; \
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} \
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} \
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} while (0)
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/* for consistency */
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#define DT_PUTPAGE(MP) BT_PUTPAGE(MP)
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#define DT_GETSEARCH(IP, LEAF, BN, MP, P, INDEX) \
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BT_GETSEARCH(IP, LEAF, BN, MP, dtpage_t, P, INDEX, i_dtroot)
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/*
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* forward references
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*/
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static int dtSplitUp(tid_t tid, struct inode *ip,
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struct dtsplit * split, struct btstack * btstack);
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static int dtSplitPage(tid_t tid, struct inode *ip, struct dtsplit * split,
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struct metapage ** rmpp, dtpage_t ** rpp, pxd_t * rxdp);
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static int dtExtendPage(tid_t tid, struct inode *ip,
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struct dtsplit * split, struct btstack * btstack);
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static int dtSplitRoot(tid_t tid, struct inode *ip,
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struct dtsplit * split, struct metapage ** rmpp);
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static int dtDeleteUp(tid_t tid, struct inode *ip, struct metapage * fmp,
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dtpage_t * fp, struct btstack * btstack);
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static int dtRelink(tid_t tid, struct inode *ip, dtpage_t * p);
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static int dtReadFirst(struct inode *ip, struct btstack * btstack);
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static int dtReadNext(struct inode *ip,
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loff_t * offset, struct btstack * btstack);
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static int dtCompare(struct component_name * key, dtpage_t * p, int si);
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static int ciCompare(struct component_name * key, dtpage_t * p, int si,
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int flag);
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static void dtGetKey(dtpage_t * p, int i, struct component_name * key,
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int flag);
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static int ciGetLeafPrefixKey(dtpage_t * lp, int li, dtpage_t * rp,
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int ri, struct component_name * key, int flag);
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static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
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ddata_t * data, struct dt_lock **);
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static void dtMoveEntry(dtpage_t * sp, int si, dtpage_t * dp,
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struct dt_lock ** sdtlock, struct dt_lock ** ddtlock,
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int do_index);
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static void dtDeleteEntry(dtpage_t * p, int fi, struct dt_lock ** dtlock);
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static void dtTruncateEntry(dtpage_t * p, int ti, struct dt_lock ** dtlock);
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static void dtLinelockFreelist(dtpage_t * p, int m, struct dt_lock ** dtlock);
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#define ciToUpper(c) UniStrupr((c)->name)
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/*
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* read_index_page()
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*
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* Reads a page of a directory's index table.
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* Having metadata mapped into the directory inode's address space
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* presents a multitude of problems. We avoid this by mapping to
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* the absolute address space outside of the *_metapage routines
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*/
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static struct metapage *read_index_page(struct inode *inode, s64 blkno)
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{
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int rc;
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s64 xaddr;
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int xflag;
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s32 xlen;
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rc = xtLookup(inode, blkno, 1, &xflag, &xaddr, &xlen, 1);
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if (rc || (xaddr == 0))
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return NULL;
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return read_metapage(inode, xaddr, PSIZE, 1);
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}
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/*
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* get_index_page()
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*
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* Same as get_index_page(), but get's a new page without reading
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*/
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static struct metapage *get_index_page(struct inode *inode, s64 blkno)
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{
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int rc;
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s64 xaddr;
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int xflag;
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s32 xlen;
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rc = xtLookup(inode, blkno, 1, &xflag, &xaddr, &xlen, 1);
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if (rc || (xaddr == 0))
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return NULL;
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return get_metapage(inode, xaddr, PSIZE, 1);
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}
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/*
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* find_index()
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*
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* Returns dtree page containing directory table entry for specified
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* index and pointer to its entry.
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*
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* mp must be released by caller.
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*/
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static struct dir_table_slot *find_index(struct inode *ip, u32 index,
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struct metapage ** mp, s64 *lblock)
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{
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struct jfs_inode_info *jfs_ip = JFS_IP(ip);
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s64 blkno;
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s64 offset;
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int page_offset;
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struct dir_table_slot *slot;
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static int maxWarnings = 10;
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if (index < 2) {
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if (maxWarnings) {
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jfs_warn("find_entry called with index = %d", index);
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maxWarnings--;
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}
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return NULL;
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}
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if (index >= jfs_ip->next_index) {
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jfs_warn("find_entry called with index >= next_index");
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return NULL;
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}
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if (jfs_dirtable_inline(ip)) {
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/*
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* Inline directory table
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*/
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*mp = NULL;
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slot = &jfs_ip->i_dirtable[index - 2];
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} else {
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offset = (index - 2) * sizeof(struct dir_table_slot);
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page_offset = offset & (PSIZE - 1);
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blkno = ((offset + 1) >> L2PSIZE) <<
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JFS_SBI(ip->i_sb)->l2nbperpage;
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if (*mp && (*lblock != blkno)) {
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release_metapage(*mp);
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*mp = NULL;
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}
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if (!(*mp)) {
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*lblock = blkno;
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*mp = read_index_page(ip, blkno);
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}
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if (!(*mp)) {
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jfs_err("free_index: error reading directory table");
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return NULL;
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}
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slot =
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(struct dir_table_slot *) ((char *) (*mp)->data +
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page_offset);
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}
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return slot;
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}
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static inline void lock_index(tid_t tid, struct inode *ip, struct metapage * mp,
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u32 index)
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{
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struct tlock *tlck;
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struct linelock *llck;
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struct lv *lv;
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tlck = txLock(tid, ip, mp, tlckDATA);
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llck = (struct linelock *) tlck->lock;
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if (llck->index >= llck->maxcnt)
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llck = txLinelock(llck);
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lv = &llck->lv[llck->index];
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/*
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* Linelock slot size is twice the size of directory table
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* slot size. 512 entries per page.
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*/
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lv->offset = ((index - 2) & 511) >> 1;
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lv->length = 1;
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llck->index++;
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}
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/*
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* add_index()
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*
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* Adds an entry to the directory index table. This is used to provide
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* each directory entry with a persistent index in which to resume
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* directory traversals
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*/
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static u32 add_index(tid_t tid, struct inode *ip, s64 bn, int slot)
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{
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struct super_block *sb = ip->i_sb;
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struct jfs_sb_info *sbi = JFS_SBI(sb);
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struct jfs_inode_info *jfs_ip = JFS_IP(ip);
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u64 blkno;
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struct dir_table_slot *dirtab_slot;
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u32 index;
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struct linelock *llck;
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struct lv *lv;
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struct metapage *mp;
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s64 offset;
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uint page_offset;
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struct tlock *tlck;
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s64 xaddr;
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ASSERT(DO_INDEX(ip));
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if (jfs_ip->next_index < 2) {
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jfs_warn("add_index: next_index = %d. Resetting!",
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jfs_ip->next_index);
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jfs_ip->next_index = 2;
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}
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index = jfs_ip->next_index++;
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if (index <= MAX_INLINE_DIRTABLE_ENTRY) {
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/*
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* i_size reflects size of index table, or 8 bytes per entry.
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*/
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ip->i_size = (loff_t) (index - 1) << 3;
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/*
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* dir table fits inline within inode
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*/
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dirtab_slot = &jfs_ip->i_dirtable[index-2];
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dirtab_slot->flag = DIR_INDEX_VALID;
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dirtab_slot->slot = slot;
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DTSaddress(dirtab_slot, bn);
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set_cflag(COMMIT_Dirtable, ip);
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return index;
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}
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if (index == (MAX_INLINE_DIRTABLE_ENTRY + 1)) {
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struct dir_table_slot temp_table[12];
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/*
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* It's time to move the inline table to an external
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* page and begin to build the xtree
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*/
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if (dquot_alloc_block(ip, sbi->nbperpage))
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goto clean_up;
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if (dbAlloc(ip, 0, sbi->nbperpage, &xaddr)) {
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dquot_free_block(ip, sbi->nbperpage);
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goto clean_up;
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}
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/*
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* Save the table, we're going to overwrite it with the
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* xtree root
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*/
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memcpy(temp_table, &jfs_ip->i_dirtable, sizeof(temp_table));
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/*
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* Initialize empty x-tree
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*/
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xtInitRoot(tid, ip);
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/*
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* Add the first block to the xtree
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*/
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if (xtInsert(tid, ip, 0, 0, sbi->nbperpage, &xaddr, 0)) {
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/* This really shouldn't fail */
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jfs_warn("add_index: xtInsert failed!");
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memcpy(&jfs_ip->i_dirtable, temp_table,
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sizeof (temp_table));
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dbFree(ip, xaddr, sbi->nbperpage);
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dquot_free_block(ip, sbi->nbperpage);
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goto clean_up;
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}
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ip->i_size = PSIZE;
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mp = get_index_page(ip, 0);
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if (!mp) {
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jfs_err("add_index: get_metapage failed!");
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xtTruncate(tid, ip, 0, COMMIT_PWMAP);
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memcpy(&jfs_ip->i_dirtable, temp_table,
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sizeof (temp_table));
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goto clean_up;
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}
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tlck = txLock(tid, ip, mp, tlckDATA);
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llck = (struct linelock *) & tlck->lock;
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ASSERT(llck->index == 0);
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lv = &llck->lv[0];
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lv->offset = 0;
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lv->length = 6; /* tlckDATA slot size is 16 bytes */
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llck->index++;
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memcpy(mp->data, temp_table, sizeof(temp_table));
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mark_metapage_dirty(mp);
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release_metapage(mp);
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/*
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* Logging is now directed by xtree tlocks
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*/
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clear_cflag(COMMIT_Dirtable, ip);
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}
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offset = (index - 2) * sizeof(struct dir_table_slot);
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page_offset = offset & (PSIZE - 1);
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blkno = ((offset + 1) >> L2PSIZE) << sbi->l2nbperpage;
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if (page_offset == 0) {
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/*
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* This will be the beginning of a new page
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*/
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xaddr = 0;
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if (xtInsert(tid, ip, 0, blkno, sbi->nbperpage, &xaddr, 0)) {
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jfs_warn("add_index: xtInsert failed!");
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goto clean_up;
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}
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ip->i_size += PSIZE;
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if ((mp = get_index_page(ip, blkno)))
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memset(mp->data, 0, PSIZE); /* Just looks better */
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else
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xtTruncate(tid, ip, offset, COMMIT_PWMAP);
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} else
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mp = read_index_page(ip, blkno);
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if (!mp) {
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jfs_err("add_index: get/read_metapage failed!");
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goto clean_up;
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}
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lock_index(tid, ip, mp, index);
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dirtab_slot =
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(struct dir_table_slot *) ((char *) mp->data + page_offset);
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dirtab_slot->flag = DIR_INDEX_VALID;
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dirtab_slot->slot = slot;
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DTSaddress(dirtab_slot, bn);
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mark_metapage_dirty(mp);
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release_metapage(mp);
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return index;
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clean_up:
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jfs_ip->next_index--;
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return 0;
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}
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|
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/*
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* free_index()
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|
*
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* Marks an entry to the directory index table as free.
|
|
*/
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static void free_index(tid_t tid, struct inode *ip, u32 index, u32 next)
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{
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struct dir_table_slot *dirtab_slot;
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s64 lblock;
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struct metapage *mp = NULL;
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dirtab_slot = find_index(ip, index, &mp, &lblock);
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if (!dirtab_slot)
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return;
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dirtab_slot->flag = DIR_INDEX_FREE;
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dirtab_slot->slot = dirtab_slot->addr1 = 0;
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dirtab_slot->addr2 = cpu_to_le32(next);
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if (mp) {
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lock_index(tid, ip, mp, index);
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mark_metapage_dirty(mp);
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release_metapage(mp);
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} else
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set_cflag(COMMIT_Dirtable, ip);
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}
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|
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/*
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|
* modify_index()
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*
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* Changes an entry in the directory index table
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|
*/
|
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static void modify_index(tid_t tid, struct inode *ip, u32 index, s64 bn,
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int slot, struct metapage ** mp, s64 *lblock)
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|
{
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struct dir_table_slot *dirtab_slot;
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dirtab_slot = find_index(ip, index, mp, lblock);
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|
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if (!dirtab_slot)
|
|
return;
|
|
|
|
DTSaddress(dirtab_slot, bn);
|
|
dirtab_slot->slot = slot;
|
|
|
|
if (*mp) {
|
|
lock_index(tid, ip, *mp, index);
|
|
mark_metapage_dirty(*mp);
|
|
} else
|
|
set_cflag(COMMIT_Dirtable, ip);
|
|
}
|
|
|
|
/*
|
|
* read_index()
|
|
*
|
|
* reads a directory table slot
|
|
*/
|
|
static int read_index(struct inode *ip, u32 index,
|
|
struct dir_table_slot * dirtab_slot)
|
|
{
|
|
s64 lblock;
|
|
struct metapage *mp = NULL;
|
|
struct dir_table_slot *slot;
|
|
|
|
slot = find_index(ip, index, &mp, &lblock);
|
|
if (!slot) {
|
|
return -EIO;
|
|
}
|
|
|
|
memcpy(dirtab_slot, slot, sizeof(struct dir_table_slot));
|
|
|
|
if (mp)
|
|
release_metapage(mp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* dtSearch()
|
|
*
|
|
* function:
|
|
* Search for the entry with specified key
|
|
*
|
|
* parameter:
|
|
*
|
|
* return: 0 - search result on stack, leaf page pinned;
|
|
* errno - I/O error
|
|
*/
|
|
int dtSearch(struct inode *ip, struct component_name * key, ino_t * data,
|
|
struct btstack * btstack, int flag)
|
|
{
|
|
int rc = 0;
|
|
int cmp = 1; /* init for empty page */
|
|
s64 bn;
|
|
struct metapage *mp;
|
|
dtpage_t *p;
|
|
s8 *stbl;
|
|
int base, index, lim;
|
|
struct btframe *btsp;
|
|
pxd_t *pxd;
|
|
int psize = 288; /* initial in-line directory */
|
|
ino_t inumber;
|
|
struct component_name ciKey;
|
|
struct super_block *sb = ip->i_sb;
|
|
|
|
ciKey.name = kmalloc_array(JFS_NAME_MAX + 1, sizeof(wchar_t),
|
|
GFP_NOFS);
|
|
if (!ciKey.name) {
|
|
rc = -ENOMEM;
|
|
goto dtSearch_Exit2;
|
|
}
|
|
|
|
|
|
/* uppercase search key for c-i directory */
|
|
UniStrcpy(ciKey.name, key->name);
|
|
ciKey.namlen = key->namlen;
|
|
|
|
/* only uppercase if case-insensitive support is on */
|
|
if ((JFS_SBI(sb)->mntflag & JFS_OS2) == JFS_OS2) {
|
|
ciToUpper(&ciKey);
|
|
}
|
|
BT_CLR(btstack); /* reset stack */
|
|
|
|
/* init level count for max pages to split */
|
|
btstack->nsplit = 1;
|
|
|
|
/*
|
|
* 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 */
|
|
DT_GETPAGE(ip, bn, mp, psize, p, rc);
|
|
if (rc)
|
|
goto dtSearch_Exit1;
|
|
|
|
/* get sorted entry table of the page */
|
|
stbl = DT_GETSTBL(p);
|
|
|
|
/*
|
|
* binary search with search key K on the current page.
|
|
*/
|
|
for (base = 0, lim = p->header.nextindex; lim; lim >>= 1) {
|
|
index = base + (lim >> 1);
|
|
|
|
if (p->header.flag & BT_LEAF) {
|
|
/* uppercase leaf name to compare */
|
|
cmp =
|
|
ciCompare(&ciKey, p, stbl[index],
|
|
JFS_SBI(sb)->mntflag);
|
|
} else {
|
|
/* router key is in uppercase */
|
|
|
|
cmp = dtCompare(&ciKey, p, stbl[index]);
|
|
|
|
|
|
}
|
|
if (cmp == 0) {
|
|
/*
|
|
* search hit
|
|
*/
|
|
/* search hit - leaf page:
|
|
* return the entry found
|
|
*/
|
|
if (p->header.flag & BT_LEAF) {
|
|
inumber = le32_to_cpu(
|
|
((struct ldtentry *) & p->slot[stbl[index]])->inumber);
|
|
|
|
/*
|
|
* search for JFS_LOOKUP
|
|
*/
|
|
if (flag == JFS_LOOKUP) {
|
|
*data = inumber;
|
|
rc = 0;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* search for JFS_CREATE
|
|
*/
|
|
if (flag == JFS_CREATE) {
|
|
*data = inumber;
|
|
rc = -EEXIST;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* search for JFS_REMOVE or JFS_RENAME
|
|
*/
|
|
if ((flag == JFS_REMOVE ||
|
|
flag == JFS_RENAME) &&
|
|
*data != inumber) {
|
|
rc = -ESTALE;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* JFS_REMOVE|JFS_FINDDIR|JFS_RENAME
|
|
*/
|
|
/* save search result */
|
|
*data = inumber;
|
|
btsp = btstack->top;
|
|
btsp->bn = bn;
|
|
btsp->index = index;
|
|
btsp->mp = mp;
|
|
|
|
rc = 0;
|
|
goto dtSearch_Exit1;
|
|
}
|
|
|
|
/* search hit - internal page:
|
|
* descend/search its child page
|
|
*/
|
|
goto getChild;
|
|
}
|
|
|
|
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 (maxindex + 1) index.
|
|
*/
|
|
/*
|
|
* 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) {
|
|
/*
|
|
* search for JFS_LOOKUP, JFS_REMOVE, or JFS_RENAME
|
|
*/
|
|
if (flag == JFS_LOOKUP || flag == JFS_REMOVE ||
|
|
flag == JFS_RENAME) {
|
|
rc = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* search for JFS_CREATE|JFS_FINDDIR:
|
|
*
|
|
* save search result
|
|
*/
|
|
*data = 0;
|
|
btsp = btstack->top;
|
|
btsp->bn = bn;
|
|
btsp->index = base;
|
|
btsp->mp = mp;
|
|
|
|
rc = 0;
|
|
goto dtSearch_Exit1;
|
|
}
|
|
|
|
/*
|
|
* search miss - internal 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
|
|
*/
|
|
getChild:
|
|
/* update max. number of pages to split */
|
|
if (BT_STACK_FULL(btstack)) {
|
|
/* Something's corrupted, mark filesystem dirty so
|
|
* chkdsk will fix it.
|
|
*/
|
|
jfs_error(sb, "stack overrun!\n");
|
|
BT_STACK_DUMP(btstack);
|
|
rc = -EIO;
|
|
goto out;
|
|
}
|
|
btstack->nsplit++;
|
|
|
|
/* push (bn, index) of the parent page/entry */
|
|
BT_PUSH(btstack, bn, index);
|
|
|
|
/* get the child page block number */
|
|
pxd = (pxd_t *) & p->slot[stbl[index]];
|
|
bn = addressPXD(pxd);
|
|
psize = lengthPXD(pxd) << JFS_SBI(ip->i_sb)->l2bsize;
|
|
|
|
/* unpin the parent page */
|
|
DT_PUTPAGE(mp);
|
|
}
|
|
|
|
out:
|
|
DT_PUTPAGE(mp);
|
|
|
|
dtSearch_Exit1:
|
|
|
|
kfree(ciKey.name);
|
|
|
|
dtSearch_Exit2:
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
/*
|
|
* dtInsert()
|
|
*
|
|
* function: insert an entry to directory tree
|
|
*
|
|
* parameter:
|
|
*
|
|
* return: 0 - success;
|
|
* errno - failure;
|
|
*/
|
|
int dtInsert(tid_t tid, struct inode *ip,
|
|
struct component_name * name, ino_t * fsn, struct btstack * btstack)
|
|
{
|
|
int rc = 0;
|
|
struct metapage *mp; /* meta-page buffer */
|
|
dtpage_t *p; /* base B+-tree index page */
|
|
s64 bn;
|
|
int index;
|
|
struct dtsplit split; /* split information */
|
|
ddata_t data;
|
|
struct dt_lock *dtlck;
|
|
int n;
|
|
struct tlock *tlck;
|
|
struct lv *lv;
|
|
|
|
/*
|
|
* retrieve search result
|
|
*
|
|
* dtSearch() returns (leaf page pinned, index at which to insert).
|
|
* n.b. dtSearch() may return index of (maxindex + 1) of
|
|
* the full page.
|
|
*/
|
|
DT_GETSEARCH(ip, btstack->top, bn, mp, p, index);
|
|
|
|
/*
|
|
* insert entry for new key
|
|
*/
|
|
if (DO_INDEX(ip)) {
|
|
if (JFS_IP(ip)->next_index == DIREND) {
|
|
DT_PUTPAGE(mp);
|
|
return -EMLINK;
|
|
}
|
|
n = NDTLEAF(name->namlen);
|
|
data.leaf.tid = tid;
|
|
data.leaf.ip = ip;
|
|
} else {
|
|
n = NDTLEAF_LEGACY(name->namlen);
|
|
data.leaf.ip = NULL; /* signifies legacy directory format */
|
|
}
|
|
data.leaf.ino = *fsn;
|
|
|
|
/*
|
|
* leaf page does not have enough room for new entry:
|
|
*
|
|
* extend/split the leaf page;
|
|
*
|
|
* dtSplitUp() will insert the entry and unpin the leaf page.
|
|
*/
|
|
if (n > p->header.freecnt) {
|
|
split.mp = mp;
|
|
split.index = index;
|
|
split.nslot = n;
|
|
split.key = name;
|
|
split.data = &data;
|
|
rc = dtSplitUp(tid, ip, &split, btstack);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* leaf page does have enough room for new entry:
|
|
*
|
|
* insert the new data entry into the leaf page;
|
|
*/
|
|
BT_MARK_DIRTY(mp, ip);
|
|
/*
|
|
* acquire a transaction lock on the leaf page
|
|
*/
|
|
tlck = txLock(tid, ip, mp, tlckDTREE | tlckENTRY);
|
|
dtlck = (struct dt_lock *) & tlck->lock;
|
|
ASSERT(dtlck->index == 0);
|
|
lv = & dtlck->lv[0];
|
|
|
|
/* linelock header */
|
|
lv->offset = 0;
|
|
lv->length = 1;
|
|
dtlck->index++;
|
|
|
|
dtInsertEntry(p, index, name, &data, &dtlck);
|
|
|
|
/* linelock stbl of non-root leaf page */
|
|
if (!(p->header.flag & BT_ROOT)) {
|
|
if (dtlck->index >= dtlck->maxcnt)
|
|
dtlck = (struct dt_lock *) txLinelock(dtlck);
|
|
lv = & dtlck->lv[dtlck->index];
|
|
n = index >> L2DTSLOTSIZE;
|
|
lv->offset = p->header.stblindex + n;
|
|
lv->length =
|
|
((p->header.nextindex - 1) >> L2DTSLOTSIZE) - n + 1;
|
|
dtlck->index++;
|
|
}
|
|
|
|
/* unpin the leaf page */
|
|
DT_PUTPAGE(mp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* dtSplitUp()
|
|
*
|
|
* function: propagate insertion bottom up;
|
|
*
|
|
* parameter:
|
|
*
|
|
* return: 0 - success;
|
|
* errno - failure;
|
|
* leaf page unpinned;
|
|
*/
|
|
static int dtSplitUp(tid_t tid,
|
|
struct inode *ip, struct dtsplit * split, struct btstack * btstack)
|
|
{
|
|
struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
|
|
int rc = 0;
|
|
struct metapage *smp;
|
|
dtpage_t *sp; /* split page */
|
|
struct metapage *rmp;
|
|
dtpage_t *rp; /* new right page split from sp */
|
|
pxd_t rpxd; /* new right page extent descriptor */
|
|
struct metapage *lmp;
|
|
dtpage_t *lp; /* left child page */
|
|
int skip; /* index of entry of insertion */
|
|
struct btframe *parent; /* parent page entry on traverse stack */
|
|
s64 xaddr, nxaddr;
|
|
int xlen, xsize;
|
|
struct pxdlist pxdlist;
|
|
pxd_t *pxd;
|
|
struct component_name key = { 0, NULL };
|
|
ddata_t *data = split->data;
|
|
int n;
|
|
struct dt_lock *dtlck;
|
|
struct tlock *tlck;
|
|
struct lv *lv;
|
|
int quota_allocation = 0;
|
|
|
|
/* get split page */
|
|
smp = split->mp;
|
|
sp = DT_PAGE(ip, smp);
|
|
|
|
key.name = kmalloc_array(JFS_NAME_MAX + 2, sizeof(wchar_t), GFP_NOFS);
|
|
if (!key.name) {
|
|
DT_PUTPAGE(smp);
|
|
rc = -ENOMEM;
|
|
goto dtSplitUp_Exit;
|
|
}
|
|
|
|
/*
|
|
* split leaf page
|
|
*
|
|
* The split routines insert the new entry, and
|
|
* acquire txLock as appropriate.
|
|
*/
|
|
/*
|
|
* split root leaf page:
|
|
*/
|
|
if (sp->header.flag & BT_ROOT) {
|
|
/*
|
|
* allocate a single extent child page
|
|
*/
|
|
xlen = 1;
|
|
n = sbi->bsize >> L2DTSLOTSIZE;
|
|
n -= (n + 31) >> L2DTSLOTSIZE; /* stbl size */
|
|
n -= DTROOTMAXSLOT - sp->header.freecnt; /* header + entries */
|
|
if (n <= split->nslot)
|
|
xlen++;
|
|
if ((rc = dbAlloc(ip, 0, (s64) xlen, &xaddr))) {
|
|
DT_PUTPAGE(smp);
|
|
goto freeKeyName;
|
|
}
|
|
|
|
pxdlist.maxnpxd = 1;
|
|
pxdlist.npxd = 0;
|
|
pxd = &pxdlist.pxd[0];
|
|
PXDaddress(pxd, xaddr);
|
|
PXDlength(pxd, xlen);
|
|
split->pxdlist = &pxdlist;
|
|
rc = dtSplitRoot(tid, ip, split, &rmp);
|
|
|
|
if (rc)
|
|
dbFree(ip, xaddr, xlen);
|
|
else
|
|
DT_PUTPAGE(rmp);
|
|
|
|
DT_PUTPAGE(smp);
|
|
|
|
if (!DO_INDEX(ip))
|
|
ip->i_size = xlen << sbi->l2bsize;
|
|
|
|
goto freeKeyName;
|
|
}
|
|
|
|
/*
|
|
* extend first leaf page
|
|
*
|
|
* extend the 1st extent if less than buffer page size
|
|
* (dtExtendPage() reurns leaf page unpinned)
|
|
*/
|
|
pxd = &sp->header.self;
|
|
xlen = lengthPXD(pxd);
|
|
xsize = xlen << sbi->l2bsize;
|
|
if (xsize < PSIZE) {
|
|
xaddr = addressPXD(pxd);
|
|
n = xsize >> L2DTSLOTSIZE;
|
|
n -= (n + 31) >> L2DTSLOTSIZE; /* stbl size */
|
|
if ((n + sp->header.freecnt) <= split->nslot)
|
|
n = xlen + (xlen << 1);
|
|
else
|
|
n = xlen;
|
|
|
|
/* Allocate blocks to quota. */
|
|
rc = dquot_alloc_block(ip, n);
|
|
if (rc)
|
|
goto extendOut;
|
|
quota_allocation += n;
|
|
|
|
if ((rc = dbReAlloc(sbi->ipbmap, xaddr, (s64) xlen,
|
|
(s64) n, &nxaddr)))
|
|
goto extendOut;
|
|
|
|
pxdlist.maxnpxd = 1;
|
|
pxdlist.npxd = 0;
|
|
pxd = &pxdlist.pxd[0];
|
|
PXDaddress(pxd, nxaddr);
|
|
PXDlength(pxd, xlen + n);
|
|
split->pxdlist = &pxdlist;
|
|
if ((rc = dtExtendPage(tid, ip, split, btstack))) {
|
|
nxaddr = addressPXD(pxd);
|
|
if (xaddr != nxaddr) {
|
|
/* free relocated extent */
|
|
xlen = lengthPXD(pxd);
|
|
dbFree(ip, nxaddr, (s64) xlen);
|
|
} else {
|
|
/* free extended delta */
|
|
xlen = lengthPXD(pxd) - n;
|
|
xaddr = addressPXD(pxd) + xlen;
|
|
dbFree(ip, xaddr, (s64) n);
|
|
}
|
|
} else if (!DO_INDEX(ip))
|
|
ip->i_size = lengthPXD(pxd) << sbi->l2bsize;
|
|
|
|
|
|
extendOut:
|
|
DT_PUTPAGE(smp);
|
|
goto freeKeyName;
|
|
}
|
|
|
|
/*
|
|
* split leaf page <sp> into <sp> and a new right page <rp>.
|
|
*
|
|
* return <rp> pinned and its extent descriptor <rpxd>
|
|
*/
|
|
/*
|
|
* allocate new directory page extent and
|
|
* new index page(s) to cover page split(s)
|
|
*
|
|
* allocation hint: ?
|
|
*/
|
|
n = btstack->nsplit;
|
|
pxdlist.maxnpxd = pxdlist.npxd = 0;
|
|
xlen = sbi->nbperpage;
|
|
for (pxd = pxdlist.pxd; n > 0; n--, pxd++) {
|
|
if ((rc = dbAlloc(ip, 0, (s64) xlen, &xaddr)) == 0) {
|
|
PXDaddress(pxd, xaddr);
|
|
PXDlength(pxd, xlen);
|
|
pxdlist.maxnpxd++;
|
|
continue;
|
|
}
|
|
|
|
DT_PUTPAGE(smp);
|
|
|
|
/* undo allocation */
|
|
goto splitOut;
|
|
}
|
|
|
|
split->pxdlist = &pxdlist;
|
|
if ((rc = dtSplitPage(tid, ip, split, &rmp, &rp, &rpxd))) {
|
|
DT_PUTPAGE(smp);
|
|
|
|
/* undo allocation */
|
|
goto splitOut;
|
|
}
|
|
|
|
if (!DO_INDEX(ip))
|
|
ip->i_size += PSIZE;
|
|
|
|
/*
|
|
* 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 4 pages pinned at any time:
|
|
* two children, left parent and right parent (when the parent splits).
|
|
* keep the child pages 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 (<lp>, <rp>) pinned */
|
|
lmp = smp;
|
|
lp = sp;
|
|
|
|
/*
|
|
* insert router entry in parent for new right child page <rp>
|
|
*/
|
|
/* get the parent page <sp> */
|
|
DT_GETPAGE(ip, parent->bn, smp, PSIZE, sp, rc);
|
|
if (rc) {
|
|
DT_PUTPAGE(lmp);
|
|
DT_PUTPAGE(rmp);
|
|
goto splitOut;
|
|
}
|
|
|
|
/*
|
|
* The new key entry goes ONE AFTER the index of parent entry,
|
|
* because the split was to the right.
|
|
*/
|
|
skip = parent->index + 1;
|
|
|
|
/*
|
|
* compute the key for the router entry
|
|
*
|
|
* key suffix compression:
|
|
* for internal pages that have leaf pages as children,
|
|
* retain only what's needed to distinguish between
|
|
* the new entry and the entry on the page to its left.
|
|
* If the keys compare equal, retain the entire key.
|
|
*
|
|
* note that compression is performed only at computing
|
|
* router key at the lowest internal level.
|
|
* further compression of the key between pairs of higher
|
|
* level internal pages loses too much information and
|
|
* the search may fail.
|
|
* (e.g., two adjacent leaf pages of {a, ..., x} {xx, ...,}
|
|
* results in two adjacent parent entries (a)(xx).
|
|
* if split occurs between these two entries, and
|
|
* if compression is applied, the router key of parent entry
|
|
* of right page (x) will divert search for x into right
|
|
* subtree and miss x in the left subtree.)
|
|
*
|
|
* the entire key must be retained for the next-to-leftmost
|
|
* internal key at any level of the tree, or search may fail
|
|
* (e.g., ?)
|
|
*/
|
|
switch (rp->header.flag & BT_TYPE) {
|
|
case BT_LEAF:
|
|
/*
|
|
* compute the length of prefix for suffix compression
|
|
* between last entry of left page and first entry
|
|
* of right page
|
|
*/
|
|
if ((sp->header.flag & BT_ROOT && skip > 1) ||
|
|
sp->header.prev != 0 || skip > 1) {
|
|
/* compute uppercase router prefix key */
|
|
rc = ciGetLeafPrefixKey(lp,
|
|
lp->header.nextindex-1,
|
|
rp, 0, &key,
|
|
sbi->mntflag);
|
|
if (rc) {
|
|
DT_PUTPAGE(lmp);
|
|
DT_PUTPAGE(rmp);
|
|
DT_PUTPAGE(smp);
|
|
goto splitOut;
|
|
}
|
|
} else {
|
|
/* next to leftmost entry of
|
|
lowest internal level */
|
|
|
|
/* compute uppercase router key */
|
|
dtGetKey(rp, 0, &key, sbi->mntflag);
|
|
key.name[key.namlen] = 0;
|
|
|
|
if ((sbi->mntflag & JFS_OS2) == JFS_OS2)
|
|
ciToUpper(&key);
|
|
}
|
|
|
|
n = NDTINTERNAL(key.namlen);
|
|
break;
|
|
|
|
case BT_INTERNAL:
|
|
dtGetKey(rp, 0, &key, sbi->mntflag);
|
|
n = NDTINTERNAL(key.namlen);
|
|
break;
|
|
|
|
default:
|
|
jfs_err("dtSplitUp(): UFO!");
|
|
break;
|
|
}
|
|
|
|
/* unpin left child page */
|
|
DT_PUTPAGE(lmp);
|
|
|
|
/*
|
|
* compute the data for the router entry
|
|
*/
|
|
data->xd = rpxd; /* child page xd */
|
|
|
|
/*
|
|
* parent page is full - split the parent page
|
|
*/
|
|
if (n > sp->header.freecnt) {
|
|
/* init for parent page split */
|
|
split->mp = smp;
|
|
split->index = skip; /* index at insert */
|
|
split->nslot = n;
|
|
split->key = &key;
|
|
/* split->data = data; */
|
|
|
|
/* unpin right child page */
|
|
DT_PUTPAGE(rmp);
|
|
|
|
/* The split routines insert the new entry,
|
|
* acquire txLock as appropriate.
|
|
* return <rp> pinned and its block number <rbn>.
|
|
*/
|
|
rc = (sp->header.flag & BT_ROOT) ?
|
|
dtSplitRoot(tid, ip, split, &rmp) :
|
|
dtSplitPage(tid, ip, split, &rmp, &rp, &rpxd);
|
|
if (rc) {
|
|
DT_PUTPAGE(smp);
|
|
goto splitOut;
|
|
}
|
|
|
|
/* smp and rmp are pinned */
|
|
}
|
|
/*
|
|
* parent page is not full - insert router entry in parent page
|
|
*/
|
|
else {
|
|
BT_MARK_DIRTY(smp, ip);
|
|
/*
|
|
* acquire a transaction lock on the parent page
|
|
*/
|
|
tlck = txLock(tid, ip, smp, tlckDTREE | tlckENTRY);
|
|
dtlck = (struct dt_lock *) & tlck->lock;
|
|
ASSERT(dtlck->index == 0);
|
|
lv = & dtlck->lv[0];
|
|
|
|
/* linelock header */
|
|
lv->offset = 0;
|
|
lv->length = 1;
|
|
dtlck->index++;
|
|
|
|
/* linelock stbl of non-root parent page */
|
|
if (!(sp->header.flag & BT_ROOT)) {
|
|
lv++;
|
|
n = skip >> L2DTSLOTSIZE;
|
|
lv->offset = sp->header.stblindex + n;
|
|
lv->length =
|
|
((sp->header.nextindex -
|
|
1) >> L2DTSLOTSIZE) - n + 1;
|
|
dtlck->index++;
|
|
}
|
|
|
|
dtInsertEntry(sp, skip, &key, data, &dtlck);
|
|
|
|
/* exit propagate up */
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* unpin current split and its right page */
|
|
DT_PUTPAGE(smp);
|
|
DT_PUTPAGE(rmp);
|
|
|
|
/*
|
|
* free remaining extents allocated for split
|
|
*/
|
|
splitOut:
|
|
n = pxdlist.npxd;
|
|
pxd = &pxdlist.pxd[n];
|
|
for (; n < pxdlist.maxnpxd; n++, pxd++)
|
|
dbFree(ip, addressPXD(pxd), (s64) lengthPXD(pxd));
|
|
|
|
freeKeyName:
|
|
kfree(key.name);
|
|
|
|
/* Rollback quota allocation */
|
|
if (rc && quota_allocation)
|
|
dquot_free_block(ip, quota_allocation);
|
|
|
|
dtSplitUp_Exit:
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
/*
|
|
* dtSplitPage()
|
|
*
|
|
* function: Split a non-root page of a btree.
|
|
*
|
|
* parameter:
|
|
*
|
|
* return: 0 - success;
|
|
* errno - failure;
|
|
* return split and new page pinned;
|
|
*/
|
|
static int dtSplitPage(tid_t tid, struct inode *ip, struct dtsplit * split,
|
|
struct metapage ** rmpp, dtpage_t ** rpp, pxd_t * rpxdp)
|
|
{
|
|
int rc = 0;
|
|
struct metapage *smp;
|
|
dtpage_t *sp;
|
|
struct metapage *rmp;
|
|
dtpage_t *rp; /* new right page allocated */
|
|
s64 rbn; /* new right page block number */
|
|
struct metapage *mp;
|
|
dtpage_t *p;
|
|
s64 nextbn;
|
|
struct pxdlist *pxdlist;
|
|
pxd_t *pxd;
|
|
int skip, nextindex, half, left, nxt, off, si;
|
|
struct ldtentry *ldtentry;
|
|
struct idtentry *idtentry;
|
|
u8 *stbl;
|
|
struct dtslot *f;
|
|
int fsi, stblsize;
|
|
int n;
|
|
struct dt_lock *sdtlck, *rdtlck;
|
|
struct tlock *tlck;
|
|
struct dt_lock *dtlck;
|
|
struct lv *slv, *rlv, *lv;
|
|
|
|
/* get split page */
|
|
smp = split->mp;
|
|
sp = DT_PAGE(ip, smp);
|
|
|
|
/*
|
|
* allocate the new right page for the split
|
|
*/
|
|
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. */
|
|
rc = dquot_alloc_block(ip, lengthPXD(pxd));
|
|
if (rc) {
|
|
release_metapage(rmp);
|
|
return rc;
|
|
}
|
|
|
|
jfs_info("dtSplitPage: ip:0x%p smp:0x%p rmp:0x%p", ip, smp, rmp);
|
|
|
|
BT_MARK_DIRTY(rmp, ip);
|
|
/*
|
|
* acquire a transaction lock on the new right page
|
|
*/
|
|
tlck = txLock(tid, ip, rmp, tlckDTREE | tlckNEW);
|
|
rdtlck = (struct dt_lock *) & tlck->lock;
|
|
|
|
rp = (dtpage_t *) rmp->data;
|
|
*rpp = rp;
|
|
rp->header.self = *pxd;
|
|
|
|
BT_MARK_DIRTY(smp, ip);
|
|
/*
|
|
* acquire a transaction lock on the split page
|
|
*
|
|
* action:
|
|
*/
|
|
tlck = txLock(tid, ip, smp, tlckDTREE | tlckENTRY);
|
|
sdtlck = (struct dt_lock *) & tlck->lock;
|
|
|
|
/* linelock header of split page */
|
|
ASSERT(sdtlck->index == 0);
|
|
slv = & sdtlck->lv[0];
|
|
slv->offset = 0;
|
|
slv->length = 1;
|
|
sdtlck->index++;
|
|
|
|
/*
|
|
* initialize/update sibling pointers between 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);
|
|
|
|
/*
|
|
* initialize new right page
|
|
*/
|
|
rp->header.flag = sp->header.flag;
|
|
|
|
/* compute sorted entry table at start of extent data area */
|
|
rp->header.nextindex = 0;
|
|
rp->header.stblindex = 1;
|
|
|
|
n = PSIZE >> L2DTSLOTSIZE;
|
|
rp->header.maxslot = n;
|
|
stblsize = (n + 31) >> L2DTSLOTSIZE; /* in unit of slot */
|
|
|
|
/* init freelist */
|
|
fsi = rp->header.stblindex + stblsize;
|
|
rp->header.freelist = fsi;
|
|
rp->header.freecnt = rp->header.maxslot - fsi;
|
|
|
|
/*
|
|
* sequential append at tail: append without split
|
|
*
|
|
* 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'll just 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 && split->index == sp->header.nextindex) {
|
|
/* linelock header + stbl (first slot) of new page */
|
|
rlv = & rdtlck->lv[rdtlck->index];
|
|
rlv->offset = 0;
|
|
rlv->length = 2;
|
|
rdtlck->index++;
|
|
|
|
/*
|
|
* initialize freelist of new right page
|
|
*/
|
|
f = &rp->slot[fsi];
|
|
for (fsi++; fsi < rp->header.maxslot; f++, fsi++)
|
|
f->next = fsi;
|
|
f->next = -1;
|
|
|
|
/* insert entry at the first entry of the new right page */
|
|
dtInsertEntry(rp, 0, split->key, split->data, &rdtlck);
|
|
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* non-sequential insert (at possibly middle page)
|
|
*/
|
|
|
|
/*
|
|
* update prev pointer of previous right sibling page;
|
|
*/
|
|
if (nextbn != 0) {
|
|
DT_GETPAGE(ip, nextbn, mp, PSIZE, p, rc);
|
|
if (rc) {
|
|
discard_metapage(rmp);
|
|
return rc;
|
|
}
|
|
|
|
BT_MARK_DIRTY(mp, ip);
|
|
/*
|
|
* acquire a transaction lock on the next page
|
|
*/
|
|
tlck = txLock(tid, ip, mp, tlckDTREE | tlckRELINK);
|
|
jfs_info("dtSplitPage: tlck = 0x%p, ip = 0x%p, mp=0x%p",
|
|
tlck, ip, mp);
|
|
dtlck = (struct dt_lock *) & tlck->lock;
|
|
|
|
/* linelock header of previous right sibling page */
|
|
lv = & dtlck->lv[dtlck->index];
|
|
lv->offset = 0;
|
|
lv->length = 1;
|
|
dtlck->index++;
|
|
|
|
p->header.prev = cpu_to_le64(rbn);
|
|
|
|
DT_PUTPAGE(mp);
|
|
}
|
|
|
|
/*
|
|
* split the data between the split and right pages.
|
|
*/
|
|
skip = split->index;
|
|
half = (PSIZE >> L2DTSLOTSIZE) >> 1; /* swag */
|
|
left = 0;
|
|
|
|
/*
|
|
* compute fill factor for split pages
|
|
*
|
|
* <nxt> traces the next entry to move to rp
|
|
* <off> traces the next entry to stay in sp
|
|
*/
|
|
stbl = (u8 *) & sp->slot[sp->header.stblindex];
|
|
nextindex = sp->header.nextindex;
|
|
for (nxt = off = 0; nxt < nextindex; ++off) {
|
|
if (off == skip)
|
|
/* check for fill factor with new entry size */
|
|
n = split->nslot;
|
|
else {
|
|
si = stbl[nxt];
|
|
switch (sp->header.flag & BT_TYPE) {
|
|
case BT_LEAF:
|
|
ldtentry = (struct ldtentry *) & sp->slot[si];
|
|
if (DO_INDEX(ip))
|
|
n = NDTLEAF(ldtentry->namlen);
|
|
else
|
|
n = NDTLEAF_LEGACY(ldtentry->
|
|
namlen);
|
|
break;
|
|
|
|
case BT_INTERNAL:
|
|
idtentry = (struct idtentry *) & sp->slot[si];
|
|
n = NDTINTERNAL(idtentry->namlen);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
++nxt; /* advance to next entry to move in sp */
|
|
}
|
|
|
|
left += n;
|
|
if (left >= half)
|
|
break;
|
|
}
|
|
|
|
/* <nxt> poins to the 1st entry to move */
|
|
|
|
/*
|
|
* move entries to right page
|
|
*
|
|
* dtMoveEntry() initializes rp and reserves entry for insertion
|
|
*
|
|
* split page moved out entries are linelocked;
|
|
* new/right page moved in entries are linelocked;
|
|
*/
|
|
/* linelock header + stbl of new right page */
|
|
rlv = & rdtlck->lv[rdtlck->index];
|
|
rlv->offset = 0;
|
|
rlv->length = 5;
|
|
rdtlck->index++;
|
|
|
|
dtMoveEntry(sp, nxt, rp, &sdtlck, &rdtlck, DO_INDEX(ip));
|
|
|
|
sp->header.nextindex = nxt;
|
|
|
|
/*
|
|
* finalize freelist of new right page
|
|
*/
|
|
fsi = rp->header.freelist;
|
|
f = &rp->slot[fsi];
|
|
for (fsi++; fsi < rp->header.maxslot; f++, fsi++)
|
|
f->next = fsi;
|
|
f->next = -1;
|
|
|
|
/*
|
|
* Update directory index table for entries now in right page
|
|
*/
|
|
if ((rp->header.flag & BT_LEAF) && DO_INDEX(ip)) {
|
|
s64 lblock;
|
|
|
|
mp = NULL;
|
|
stbl = DT_GETSTBL(rp);
|
|
for (n = 0; n < rp->header.nextindex; n++) {
|
|
ldtentry = (struct ldtentry *) & rp->slot[stbl[n]];
|
|
modify_index(tid, ip, le32_to_cpu(ldtentry->index),
|
|
rbn, n, &mp, &lblock);
|
|
}
|
|
if (mp)
|
|
release_metapage(mp);
|
|
}
|
|
|
|
/*
|
|
* the skipped index was on the left page,
|
|
*/
|
|
if (skip <= off) {
|
|
/* insert the new entry in the split page */
|
|
dtInsertEntry(sp, skip, split->key, split->data, &sdtlck);
|
|
|
|
/* linelock stbl of split page */
|
|
if (sdtlck->index >= sdtlck->maxcnt)
|
|
sdtlck = (struct dt_lock *) txLinelock(sdtlck);
|
|
slv = & sdtlck->lv[sdtlck->index];
|
|
n = skip >> L2DTSLOTSIZE;
|
|
slv->offset = sp->header.stblindex + n;
|
|
slv->length =
|
|
((sp->header.nextindex - 1) >> L2DTSLOTSIZE) - n + 1;
|
|
sdtlck->index++;
|
|
}
|
|
/*
|
|
* the skipped index was on the right page,
|
|
*/
|
|
else {
|
|
/* adjust the skip index to reflect the new position */
|
|
skip -= nxt;
|
|
|
|
/* insert the new entry in the right page */
|
|
dtInsertEntry(rp, skip, split->key, split->data, &rdtlck);
|
|
}
|
|
|
|
out:
|
|
*rmpp = rmp;
|
|
*rpxdp = *pxd;
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
/*
|
|
* dtExtendPage()
|
|
*
|
|
* function: extend 1st/only directory leaf page
|
|
*
|
|
* parameter:
|
|
*
|
|
* return: 0 - success;
|
|
* errno - failure;
|
|
* return extended page pinned;
|
|
*/
|
|
static int dtExtendPage(tid_t tid,
|
|
struct inode *ip, struct dtsplit * split, struct btstack * btstack)
|
|
{
|
|
struct super_block *sb = ip->i_sb;
|
|
int rc;
|
|
struct metapage *smp, *pmp, *mp;
|
|
dtpage_t *sp, *pp;
|
|
struct pxdlist *pxdlist;
|
|
pxd_t *pxd, *tpxd;
|
|
int xlen, xsize;
|
|
int newstblindex, newstblsize;
|
|
int oldstblindex, oldstblsize;
|
|
int fsi, last;
|
|
struct dtslot *f;
|
|
struct btframe *parent;
|
|
int n;
|
|
struct dt_lock *dtlck;
|
|
s64 xaddr, txaddr;
|
|
struct tlock *tlck;
|
|
struct pxd_lock *pxdlock;
|
|
struct lv *lv;
|
|
uint type;
|
|
struct ldtentry *ldtentry;
|
|
u8 *stbl;
|
|
|
|
/* get page to extend */
|
|
smp = split->mp;
|
|
sp = DT_PAGE(ip, smp);
|
|
|
|
/* get parent/root page */
|
|
parent = BT_POP(btstack);
|
|
DT_GETPAGE(ip, parent->bn, pmp, PSIZE, pp, rc);
|
|
if (rc)
|
|
return (rc);
|
|
|
|
/*
|
|
* extend the extent
|
|
*/
|
|
pxdlist = split->pxdlist;
|
|
pxd = &pxdlist->pxd[pxdlist->npxd];
|
|
pxdlist->npxd++;
|
|
|
|
xaddr = addressPXD(pxd);
|
|
tpxd = &sp->header.self;
|
|
txaddr = addressPXD(tpxd);
|
|
/* in-place extension */
|
|
if (xaddr == txaddr) {
|
|
type = tlckEXTEND;
|
|
}
|
|
/* relocation */
|
|
else {
|
|
type = tlckNEW;
|
|
|
|
/* save moved extent descriptor for later free */
|
|
tlck = txMaplock(tid, ip, tlckDTREE | tlckRELOCATE);
|
|
pxdlock = (struct pxd_lock *) & tlck->lock;
|
|
pxdlock->flag = mlckFREEPXD;
|
|
pxdlock->pxd = sp->header.self;
|
|
pxdlock->index = 1;
|
|
|
|
/*
|
|
* Update directory index table to reflect new page address
|
|
*/
|
|
if (DO_INDEX(ip)) {
|
|
s64 lblock;
|
|
|
|
mp = NULL;
|
|
stbl = DT_GETSTBL(sp);
|
|
for (n = 0; n < sp->header.nextindex; n++) {
|
|
ldtentry =
|
|
(struct ldtentry *) & sp->slot[stbl[n]];
|
|
modify_index(tid, ip,
|
|
le32_to_cpu(ldtentry->index),
|
|
xaddr, n, &mp, &lblock);
|
|
}
|
|
if (mp)
|
|
release_metapage(mp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* extend the page
|
|
*/
|
|
sp->header.self = *pxd;
|
|
|
|
jfs_info("dtExtendPage: ip:0x%p smp:0x%p sp:0x%p", ip, smp, sp);
|
|
|
|
BT_MARK_DIRTY(smp, ip);
|
|
/*
|
|
* acquire a transaction lock on the extended/leaf page
|
|
*/
|
|
tlck = txLock(tid, ip, smp, tlckDTREE | type);
|
|
dtlck = (struct dt_lock *) & tlck->lock;
|
|
lv = & dtlck->lv[0];
|
|
|
|
/* update buffer extent descriptor of extended page */
|
|
xlen = lengthPXD(pxd);
|
|
xsize = xlen << JFS_SBI(sb)->l2bsize;
|
|
|
|
/*
|
|
* copy old stbl to new stbl at start of extended area
|
|
*/
|
|
oldstblindex = sp->header.stblindex;
|
|
oldstblsize = (sp->header.maxslot + 31) >> L2DTSLOTSIZE;
|
|
newstblindex = sp->header.maxslot;
|
|
n = xsize >> L2DTSLOTSIZE;
|
|
newstblsize = (n + 31) >> L2DTSLOTSIZE;
|
|
memcpy(&sp->slot[newstblindex], &sp->slot[oldstblindex],
|
|
sp->header.nextindex);
|
|
|
|
/*
|
|
* in-line extension: linelock old area of extended page
|
|
*/
|
|
if (type == tlckEXTEND) {
|
|
/* linelock header */
|
|
lv->offset = 0;
|
|
lv->length = 1;
|
|
dtlck->index++;
|
|
lv++;
|
|
|
|
/* linelock new stbl of extended page */
|
|
lv->offset = newstblindex;
|
|
lv->length = newstblsize;
|
|
}
|
|
/*
|
|
* relocation: linelock whole relocated area
|
|
*/
|
|
else {
|
|
lv->offset = 0;
|
|
lv->length = sp->header.maxslot + newstblsize;
|
|
}
|
|
|
|
dtlck->index++;
|
|
|
|
sp->header.maxslot = n;
|
|
sp->header.stblindex = newstblindex;
|
|
/* sp->header.nextindex remains the same */
|
|
|
|
/*
|
|
* add old stbl region at head of freelist
|
|
*/
|
|
fsi = oldstblindex;
|
|
f = &sp->slot[fsi];
|
|
last = sp->header.freelist;
|
|
for (n = 0; n < oldstblsize; n++, fsi++, f++) {
|
|
f->next = last;
|
|
last = fsi;
|
|
}
|
|
sp->header.freelist = last;
|
|
sp->header.freecnt += oldstblsize;
|
|
|
|
/*
|
|
* append free region of newly extended area at tail of freelist
|
|
*/
|
|
/* init free region of newly extended area */
|
|
fsi = n = newstblindex + newstblsize;
|
|
f = &sp->slot[fsi];
|
|
for (fsi++; fsi < sp->header.maxslot; f++, fsi++)
|
|
f->next = fsi;
|
|
f->next = -1;
|
|
|
|
/* append new free region at tail of old freelist */
|
|
fsi = sp->header.freelist;
|
|
if (fsi == -1)
|
|
sp->header.freelist = n;
|
|
else {
|
|
do {
|
|
f = &sp->slot[fsi];
|
|
fsi = f->next;
|
|
} while (fsi != -1);
|
|
|
|
f->next = n;
|
|
}
|
|
|
|
sp->header.freecnt += sp->header.maxslot - n;
|
|
|
|
/*
|
|
* insert the new entry
|
|
*/
|
|
dtInsertEntry(sp, split->index, split->key, split->data, &dtlck);
|
|
|
|
BT_MARK_DIRTY(pmp, ip);
|
|
/*
|
|
* linelock any freeslots residing in old extent
|
|
*/
|
|
if (type == tlckEXTEND) {
|
|
n = sp->header.maxslot >> 2;
|
|
if (sp->header.freelist < n)
|
|
dtLinelockFreelist(sp, n, &dtlck);
|
|
}
|
|
|
|
/*
|
|
* update parent entry on the parent/root page
|
|
*/
|
|
/*
|
|
* acquire a transaction lock on the parent/root page
|
|
*/
|
|
tlck = txLock(tid, ip, pmp, tlckDTREE | tlckENTRY);
|
|
dtlck = (struct dt_lock *) & tlck->lock;
|
|
lv = & dtlck->lv[dtlck->index];
|
|
|
|
/* linelock parent entry - 1st slot */
|
|
lv->offset = 1;
|
|
lv->length = 1;
|
|
dtlck->index++;
|
|
|
|
/* update the parent pxd for page extension */
|
|
tpxd = (pxd_t *) & pp->slot[1];
|
|
*tpxd = *pxd;
|
|
|
|
DT_PUTPAGE(pmp);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* dtSplitRoot()
|
|
*
|
|
* 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:
|
|
*
|
|
* return: 0 - success;
|
|
* errno - failure;
|
|
* return new page pinned;
|
|
*/
|
|
static int dtSplitRoot(tid_t tid,
|
|
struct inode *ip, struct dtsplit * split, struct metapage ** rmpp)
|
|
{
|
|
struct super_block *sb = ip->i_sb;
|
|
struct metapage *smp;
|
|
dtroot_t *sp;
|
|
struct metapage *rmp;
|
|
dtpage_t *rp;
|
|
s64 rbn;
|
|
int xlen;
|
|
int xsize;
|
|
struct dtslot *f;
|
|
s8 *stbl;
|
|
int fsi, stblsize, n;
|
|
struct idtentry *s;
|
|
pxd_t *ppxd;
|
|
struct pxdlist *pxdlist;
|
|
pxd_t *pxd;
|
|
struct dt_lock *dtlck;
|
|
struct tlock *tlck;
|
|
struct lv *lv;
|
|
int rc;
|
|
|
|
/* get split root page */
|
|
smp = split->mp;
|
|
sp = &JFS_IP(ip)->i_dtroot;
|
|
|
|
/*
|
|
* allocate/initialize a single (right) child page
|
|
*
|
|
* N.B. at first split, a one (or two) block to fit new entry
|
|
* is allocated; at subsequent split, a full page is allocated;
|
|
*/
|
|
pxdlist = split->pxdlist;
|
|
pxd = &pxdlist->pxd[pxdlist->npxd];
|
|
pxdlist->npxd++;
|
|
rbn = addressPXD(pxd);
|
|
xlen = lengthPXD(pxd);
|
|
xsize = xlen << JFS_SBI(sb)->l2bsize;
|
|
rmp = get_metapage(ip, rbn, xsize, 1);
|
|
if (!rmp)
|
|
return -EIO;
|
|
|
|
rp = rmp->data;
|
|
|
|
/* Allocate blocks to quota. */
|
|
rc = dquot_alloc_block(ip, lengthPXD(pxd));
|
|
if (rc) {
|
|
release_metapage(rmp);
|
|
return rc;
|
|
}
|
|
|
|
BT_MARK_DIRTY(rmp, ip);
|
|
/*
|
|
* acquire a transaction lock on the new right page
|
|
*/
|
|
tlck = txLock(tid, ip, rmp, tlckDTREE | tlckNEW);
|
|
dtlck = (struct dt_lock *) & tlck->lock;
|
|
|
|
rp->header.flag =
|
|
(sp->header.flag & BT_LEAF) ? BT_LEAF : BT_INTERNAL;
|
|
rp->header.self = *pxd;
|
|
|
|
/* initialize sibling pointers */
|
|
rp->header.next = 0;
|
|
rp->header.prev = 0;
|
|
|
|
/*
|
|
* move in-line root page into new right page extent
|
|
*/
|
|
/* linelock header + copied entries + new stbl (1st slot) in new page */
|
|
ASSERT(dtlck->index == 0);
|
|
lv = & dtlck->lv[0];
|
|
lv->offset = 0;
|
|
lv->length = 10; /* 1 + 8 + 1 */
|
|
dtlck->index++;
|
|
|
|
n = xsize >> L2DTSLOTSIZE;
|
|
rp->header.maxslot = n;
|
|
stblsize = (n + 31) >> L2DTSLOTSIZE;
|
|
|
|
/* copy old stbl to new stbl at start of extended area */
|
|
rp->header.stblindex = DTROOTMAXSLOT;
|
|
stbl = (s8 *) & rp->slot[DTROOTMAXSLOT];
|
|
memcpy(stbl, sp->header.stbl, sp->header.nextindex);
|
|
rp->header.nextindex = sp->header.nextindex;
|
|
|
|
/* copy old data area to start of new data area */
|
|
memcpy(&rp->slot[1], &sp->slot[1], IDATASIZE);
|
|
|
|
/*
|
|
* append free region of newly extended area at tail of freelist
|
|
*/
|
|
/* init free region of newly extended area */
|
|
fsi = n = DTROOTMAXSLOT + stblsize;
|
|
f = &rp->slot[fsi];
|
|
for (fsi++; fsi < rp->header.maxslot; f++, fsi++)
|
|
f->next = fsi;
|
|
f->next = -1;
|
|
|
|
/* append new free region at tail of old freelist */
|
|
fsi = sp->header.freelist;
|
|
if (fsi == -1)
|
|
rp->header.freelist = n;
|
|
else {
|
|
rp->header.freelist = fsi;
|
|
|
|
do {
|
|
f = &rp->slot[fsi];
|
|
fsi = f->next;
|
|
} while (fsi != -1);
|
|
|
|
f->next = n;
|
|
}
|
|
|
|
rp->header.freecnt = sp->header.freecnt + rp->header.maxslot - n;
|
|
|
|
/*
|
|
* Update directory index table for entries now in right page
|
|
*/
|
|
if ((rp->header.flag & BT_LEAF) && DO_INDEX(ip)) {
|
|
s64 lblock;
|
|
struct metapage *mp = NULL;
|
|
struct ldtentry *ldtentry;
|
|
|
|
stbl = DT_GETSTBL(rp);
|
|
for (n = 0; n < rp->header.nextindex; n++) {
|
|
ldtentry = (struct ldtentry *) & rp->slot[stbl[n]];
|
|
modify_index(tid, ip, le32_to_cpu(ldtentry->index),
|
|
rbn, n, &mp, &lblock);
|
|
}
|
|
if (mp)
|
|
release_metapage(mp);
|
|
}
|
|
/*
|
|
* insert the new entry into the new right/child page
|
|
* (skip index in the new right page will not change)
|
|
*/
|
|
dtInsertEntry(rp, split->index, split->key, split->data, &dtlck);
|
|
|
|
/*
|
|
* reset parent/root 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.
|
|
*
|
|
* The btree comparison code guarantees that the left-most key on any
|
|
* level of the tree is never used, so it doesn't need to be filled in.
|
|
*/
|
|
BT_MARK_DIRTY(smp, ip);
|
|
/*
|
|
* acquire a transaction lock on the root page (in-memory inode)
|
|
*/
|
|
tlck = txLock(tid, ip, smp, tlckDTREE | tlckNEW | tlckBTROOT);
|
|
dtlck = (struct dt_lock *) & tlck->lock;
|
|
|
|
/* linelock root */
|
|
ASSERT(dtlck->index == 0);
|
|
lv = & dtlck->lv[0];
|
|
lv->offset = 0;
|
|
lv->length = DTROOTMAXSLOT;
|
|
dtlck->index++;
|
|
|
|
/* update page header of root */
|
|
if (sp->header.flag & BT_LEAF) {
|
|
sp->header.flag &= ~BT_LEAF;
|
|
sp->header.flag |= BT_INTERNAL;
|
|
}
|
|
|
|
/* init the first entry */
|
|
s = (struct idtentry *) & sp->slot[DTENTRYSTART];
|
|
ppxd = (pxd_t *) s;
|
|
*ppxd = *pxd;
|
|
s->next = -1;
|
|
s->namlen = 0;
|
|
|
|
stbl = sp->header.stbl;
|
|
stbl[0] = DTENTRYSTART;
|
|
sp->header.nextindex = 1;
|
|
|
|
/* init freelist */
|
|
fsi = DTENTRYSTART + 1;
|
|
f = &sp->slot[fsi];
|
|
|
|
/* init free region of remaining area */
|
|
for (fsi++; fsi < DTROOTMAXSLOT; f++, fsi++)
|
|
f->next = fsi;
|
|
f->next = -1;
|
|
|
|
sp->header.freelist = DTENTRYSTART + 1;
|
|
sp->header.freecnt = DTROOTMAXSLOT - (DTENTRYSTART + 1);
|
|
|
|
*rmpp = rmp;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* dtDelete()
|
|
*
|
|
* function: delete the entry(s) referenced by a key.
|
|
*
|
|
* parameter:
|
|
*
|
|
* return:
|
|
*/
|
|
int dtDelete(tid_t tid,
|
|
struct inode *ip, struct component_name * key, ino_t * ino, int flag)
|
|
{
|
|
int rc = 0;
|
|
s64 bn;
|
|
struct metapage *mp, *imp;
|
|
dtpage_t *p;
|
|
int index;
|
|
struct btstack btstack;
|
|
struct dt_lock *dtlck;
|
|
struct tlock *tlck;
|
|
struct lv *lv;
|
|
int i;
|
|
struct ldtentry *ldtentry;
|
|
u8 *stbl;
|
|
u32 table_index, next_index;
|
|
struct metapage *nmp;
|
|
dtpage_t *np;
|
|
|
|
/*
|
|
* search for the entry to delete:
|
|
*
|
|
* dtSearch() returns (leaf page pinned, index at which to delete).
|
|
*/
|
|
if ((rc = dtSearch(ip, key, ino, &btstack, flag)))
|
|
return rc;
|
|
|
|
/* retrieve search result */
|
|
DT_GETSEARCH(ip, btstack.top, bn, mp, p, index);
|
|
|
|
/*
|
|
* We need to find put the index of the next entry into the
|
|
* directory index table in order to resume a readdir from this
|
|
* entry.
|
|
*/
|
|
if (DO_INDEX(ip)) {
|
|
stbl = DT_GETSTBL(p);
|
|
ldtentry = (struct ldtentry *) & p->slot[stbl[index]];
|
|
table_index = le32_to_cpu(ldtentry->index);
|
|
if (index == (p->header.nextindex - 1)) {
|
|
/*
|
|
* Last entry in this leaf page
|
|
*/
|
|
if ((p->header.flag & BT_ROOT)
|
|
|| (p->header.next == 0))
|
|
next_index = -1;
|
|
else {
|
|
/* Read next leaf page */
|
|
DT_GETPAGE(ip, le64_to_cpu(p->header.next),
|
|
nmp, PSIZE, np, rc);
|
|
if (rc)
|
|
next_index = -1;
|
|
else {
|
|
stbl = DT_GETSTBL(np);
|
|
ldtentry =
|
|
(struct ldtentry *) & np->
|
|
slot[stbl[0]];
|
|
next_index =
|
|
le32_to_cpu(ldtentry->index);
|
|
DT_PUTPAGE(nmp);
|
|
}
|
|
}
|
|
} else {
|
|
ldtentry =
|
|
(struct ldtentry *) & p->slot[stbl[index + 1]];
|
|
next_index = le32_to_cpu(ldtentry->index);
|
|
}
|
|
free_index(tid, ip, table_index, next_index);
|
|
}
|
|
/*
|
|
* the leaf page becomes empty, delete the page
|
|
*/
|
|
if (p->header.nextindex == 1) {
|
|
/* delete empty page */
|
|
rc = dtDeleteUp(tid, ip, mp, p, &btstack);
|
|
}
|
|
/*
|
|
* the leaf page has other entries remaining:
|
|
*
|
|
* delete the entry from the leaf page.
|
|
*/
|
|
else {
|
|
BT_MARK_DIRTY(mp, ip);
|
|
/*
|
|
* acquire a transaction lock on the leaf page
|
|
*/
|
|
tlck = txLock(tid, ip, mp, tlckDTREE | tlckENTRY);
|
|
dtlck = (struct dt_lock *) & tlck->lock;
|
|
|
|
/*
|
|
* Do not assume that dtlck->index will be zero. During a
|
|
* rename within a directory, this transaction may have
|
|
* modified this page already when adding the new entry.
|
|
*/
|
|
|
|
/* linelock header */
|
|
if (dtlck->index >= dtlck->maxcnt)
|
|
dtlck = (struct dt_lock *) txLinelock(dtlck);
|
|
lv = & dtlck->lv[dtlck->index];
|
|
lv->offset = 0;
|
|
lv->length = 1;
|
|
dtlck->index++;
|
|
|
|
/* linelock stbl of non-root leaf page */
|
|
if (!(p->header.flag & BT_ROOT)) {
|
|
if (dtlck->index >= dtlck->maxcnt)
|
|
dtlck = (struct dt_lock *) txLinelock(dtlck);
|
|
lv = & dtlck->lv[dtlck->index];
|
|
i = index >> L2DTSLOTSIZE;
|
|
lv->offset = p->header.stblindex + i;
|
|
lv->length =
|
|
((p->header.nextindex - 1) >> L2DTSLOTSIZE) -
|
|
i + 1;
|
|
dtlck->index++;
|
|
}
|
|
|
|
/* free the leaf entry */
|
|
dtDeleteEntry(p, index, &dtlck);
|
|
|
|
/*
|
|
* Update directory index table for entries moved in stbl
|
|
*/
|
|
if (DO_INDEX(ip) && index < p->header.nextindex) {
|
|
s64 lblock;
|
|
|
|
imp = NULL;
|
|
stbl = DT_GETSTBL(p);
|
|
for (i = index; i < p->header.nextindex; i++) {
|
|
ldtentry =
|
|
(struct ldtentry *) & p->slot[stbl[i]];
|
|
modify_index(tid, ip,
|
|
le32_to_cpu(ldtentry->index),
|
|
bn, i, &imp, &lblock);
|
|
}
|
|
if (imp)
|
|
release_metapage(imp);
|
|
}
|
|
|
|
DT_PUTPAGE(mp);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
/*
|
|
* dtDeleteUp()
|
|
*
|
|
* function:
|
|
* free empty pages as propagating deletion up the tree
|
|
*
|
|
* parameter:
|
|
*
|
|
* return:
|
|
*/
|
|
static int dtDeleteUp(tid_t tid, struct inode *ip,
|
|
struct metapage * fmp, dtpage_t * fp, struct btstack * btstack)
|
|
{
|
|
int rc = 0;
|
|
struct metapage *mp;
|
|
dtpage_t *p;
|
|
int index, nextindex;
|
|
int xlen;
|
|
struct btframe *parent;
|
|
struct dt_lock *dtlck;
|
|
struct tlock *tlck;
|
|
struct lv *lv;
|
|
struct pxd_lock *pxdlock;
|
|
int i;
|
|
|
|
/*
|
|
* keep the root leaf page which has become empty
|
|
*/
|
|
if (BT_IS_ROOT(fmp)) {
|
|
/*
|
|
* reset the root
|
|
*
|
|
* dtInitRoot() acquires txlock on the root
|
|
*/
|
|
dtInitRoot(tid, ip, PARENT(ip));
|
|
|
|
DT_PUTPAGE(fmp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* free the non-root leaf page
|
|
*/
|
|
/*
|
|
* acquire a transaction lock on the page
|
|
*
|
|
* write FREEXTENT|NOREDOPAGE log record
|
|
* N.B. linelock is overlaid as freed extent descriptor, and
|
|
* the buffer page is freed;
|
|
*/
|
|
tlck = txMaplock(tid, ip, tlckDTREE | tlckFREE);
|
|
pxdlock = (struct pxd_lock *) & tlck->lock;
|
|
pxdlock->flag = mlckFREEPXD;
|
|
pxdlock->pxd = fp->header.self;
|
|
pxdlock->index = 1;
|
|
|
|
/* update sibling pointers */
|
|
if ((rc = dtRelink(tid, ip, fp))) {
|
|
BT_PUTPAGE(fmp);
|
|
return rc;
|
|
}
|
|
|
|
xlen = lengthPXD(&fp->header.self);
|
|
|
|
/* Free quota allocation. */
|
|
dquot_free_block(ip, xlen);
|
|
|
|
/* free/invalidate its buffer page */
|
|
discard_metapage(fmp);
|
|
|
|
/*
|
|
* propagate page deletion up the directory 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) {
|
|
/* pin the parent page <sp> */
|
|
DT_GETPAGE(ip, parent->bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/*
|
|
* free the extent of the child page deleted
|
|
*/
|
|
index = parent->index;
|
|
|
|
/*
|
|
* delete the entry for the child page from parent
|
|
*/
|
|
nextindex = p->header.nextindex;
|
|
|
|
/*
|
|
* the parent has the single entry being deleted:
|
|
*
|
|
* free the parent page which has become empty.
|
|
*/
|
|
if (nextindex == 1) {
|
|
/*
|
|
* keep the root internal page which has become empty
|
|
*/
|
|
if (p->header.flag & BT_ROOT) {
|
|
/*
|
|
* reset the root
|
|
*
|
|
* dtInitRoot() acquires txlock on the root
|
|
*/
|
|
dtInitRoot(tid, ip, PARENT(ip));
|
|
|
|
DT_PUTPAGE(mp);
|
|
|
|
return 0;
|
|
}
|
|
/*
|
|
* free the parent page
|
|
*/
|
|
else {
|
|
/*
|
|
* acquire a transaction lock on the page
|
|
*
|
|
* write FREEXTENT|NOREDOPAGE log record
|
|
*/
|
|
tlck =
|
|
txMaplock(tid, ip,
|
|
tlckDTREE | tlckFREE);
|
|
pxdlock = (struct pxd_lock *) & tlck->lock;
|
|
pxdlock->flag = mlckFREEPXD;
|
|
pxdlock->pxd = p->header.self;
|
|
pxdlock->index = 1;
|
|
|
|
/* update sibling pointers */
|
|
if ((rc = dtRelink(tid, ip, p))) {
|
|
DT_PUTPAGE(mp);
|
|
return rc;
|
|
}
|
|
|
|
xlen = lengthPXD(&p->header.self);
|
|
|
|
/* Free quota allocation */
|
|
dquot_free_block(ip, xlen);
|
|
|
|
/* free/invalidate its buffer page */
|
|
discard_metapage(mp);
|
|
|
|
/* propagate up */
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* the parent has other entries remaining:
|
|
*
|
|
* delete the router entry from the parent page.
|
|
*/
|
|
BT_MARK_DIRTY(mp, ip);
|
|
/*
|
|
* acquire a transaction lock on the page
|
|
*
|
|
* action: router entry deletion
|
|
*/
|
|
tlck = txLock(tid, ip, mp, tlckDTREE | tlckENTRY);
|
|
dtlck = (struct dt_lock *) & tlck->lock;
|
|
|
|
/* linelock header */
|
|
if (dtlck->index >= dtlck->maxcnt)
|
|
dtlck = (struct dt_lock *) txLinelock(dtlck);
|
|
lv = & dtlck->lv[dtlck->index];
|
|
lv->offset = 0;
|
|
lv->length = 1;
|
|
dtlck->index++;
|
|
|
|
/* linelock stbl of non-root leaf page */
|
|
if (!(p->header.flag & BT_ROOT)) {
|
|
if (dtlck->index < dtlck->maxcnt)
|
|
lv++;
|
|
else {
|
|
dtlck = (struct dt_lock *) txLinelock(dtlck);
|
|
lv = & dtlck->lv[0];
|
|
}
|
|
i = index >> L2DTSLOTSIZE;
|
|
lv->offset = p->header.stblindex + i;
|
|
lv->length =
|
|
((p->header.nextindex - 1) >> L2DTSLOTSIZE) -
|
|
i + 1;
|
|
dtlck->index++;
|
|
}
|
|
|
|
/* free the router entry */
|
|
dtDeleteEntry(p, index, &dtlck);
|
|
|
|
/* reset key of new leftmost entry of level (for consistency) */
|
|
if (index == 0 &&
|
|
((p->header.flag & BT_ROOT) || p->header.prev == 0))
|
|
dtTruncateEntry(p, 0, &dtlck);
|
|
|
|
/* unpin the parent page */
|
|
DT_PUTPAGE(mp);
|
|
|
|
/* exit propagation up */
|
|
break;
|
|
}
|
|
|
|
if (!DO_INDEX(ip))
|
|
ip->i_size -= PSIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef _NOTYET
|
|
/*
|
|
* NAME: dtRelocate()
|
|
*
|
|
* FUNCTION: relocate dtpage (internal or leaf) of directory;
|
|
* This function is mainly used by defragfs utility.
|
|
*/
|
|
int dtRelocate(tid_t tid, struct inode *ip, s64 lmxaddr, pxd_t * opxd,
|
|
s64 nxaddr)
|
|
{
|
|
int rc = 0;
|
|
struct metapage *mp, *pmp, *lmp, *rmp;
|
|
dtpage_t *p, *pp, *rp = 0, *lp= 0;
|
|
s64 bn;
|
|
int index;
|
|
struct btstack btstack;
|
|
pxd_t *pxd;
|
|
s64 oxaddr, nextbn, prevbn;
|
|
int xlen, xsize;
|
|
struct tlock *tlck;
|
|
struct dt_lock *dtlck;
|
|
struct pxd_lock *pxdlock;
|
|
s8 *stbl;
|
|
struct lv *lv;
|
|
|
|
oxaddr = addressPXD(opxd);
|
|
xlen = lengthPXD(opxd);
|
|
|
|
jfs_info("dtRelocate: lmxaddr:%Ld xaddr:%Ld:%Ld xlen:%d",
|
|
(long long)lmxaddr, (long long)oxaddr, (long long)nxaddr,
|
|
xlen);
|
|
|
|
/*
|
|
* 1. get the internal parent dtpage covering
|
|
* router entry for the tartget page to be relocated;
|
|
*/
|
|
rc = dtSearchNode(ip, lmxaddr, opxd, &btstack);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* retrieve search result */
|
|
DT_GETSEARCH(ip, btstack.top, bn, pmp, pp, index);
|
|
jfs_info("dtRelocate: parent router entry validated.");
|
|
|
|
/*
|
|
* 2. relocate the target dtpage
|
|
*/
|
|
/* read in the target page from src extent */
|
|
DT_GETPAGE(ip, oxaddr, mp, PSIZE, p, rc);
|
|
if (rc) {
|
|
/* release the pinned parent page */
|
|
DT_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);
|
|
DT_GETPAGE(ip, nextbn, rmp, PSIZE, rp, rc);
|
|
if (rc) {
|
|
DT_PUTPAGE(mp);
|
|
DT_PUTPAGE(pmp);
|
|
return (rc);
|
|
}
|
|
}
|
|
|
|
lmp = NULL;
|
|
if (p->header.prev) {
|
|
prevbn = le64_to_cpu(p->header.prev);
|
|
DT_GETPAGE(ip, prevbn, lmp, PSIZE, lp, rc);
|
|
if (rc) {
|
|
DT_PUTPAGE(mp);
|
|
DT_PUTPAGE(pmp);
|
|
if (rmp)
|
|
DT_PUTPAGE(rmp);
|
|
return (rc);
|
|
}
|
|
}
|
|
|
|
/* at this point, all xtpages to be updated are in memory */
|
|
|
|
/*
|
|
* update sibling pointers of sibling dtpages if any;
|
|
*/
|
|
if (lmp) {
|
|
tlck = txLock(tid, ip, lmp, tlckDTREE | tlckRELINK);
|
|
dtlck = (struct dt_lock *) & tlck->lock;
|
|
/* linelock header */
|
|
ASSERT(dtlck->index == 0);
|
|
lv = & dtlck->lv[0];
|
|
lv->offset = 0;
|
|
lv->length = 1;
|
|
dtlck->index++;
|
|
|
|
lp->header.next = cpu_to_le64(nxaddr);
|
|
DT_PUTPAGE(lmp);
|
|
}
|
|
|
|
if (rmp) {
|
|
tlck = txLock(tid, ip, rmp, tlckDTREE | tlckRELINK);
|
|
dtlck = (struct dt_lock *) & tlck->lock;
|
|
/* linelock header */
|
|
ASSERT(dtlck->index == 0);
|
|
lv = & dtlck->lv[0];
|
|
lv->offset = 0;
|
|
lv->length = 1;
|
|
dtlck->index++;
|
|
|
|
rp->header.prev = cpu_to_le64(nxaddr);
|
|
DT_PUTPAGE(rmp);
|
|
}
|
|
|
|
/*
|
|
* update the target dtpage to be relocated
|
|
*
|
|
* write LOG_REDOPAGE of LOG_NEW type for dst page
|
|
* for the whole target page (logredo() will apply
|
|
* after image and update bmap for allocation of the
|
|
* dst extent), and update bmap for allocation of
|
|
* the dst extent;
|
|
*/
|
|
tlck = txLock(tid, ip, mp, tlckDTREE | tlckNEW);
|
|
dtlck = (struct dt_lock *) & tlck->lock;
|
|
/* linelock header */
|
|
ASSERT(dtlck->index == 0);
|
|
lv = & dtlck->lv[0];
|
|
|
|
/* update the self address in the dtpage header */
|
|
pxd = &p->header.self;
|
|
PXDaddress(pxd, nxaddr);
|
|
|
|
/* the dst page is the same as the src page, i.e.,
|
|
* linelock for afterimage of the whole page;
|
|
*/
|
|
lv->offset = 0;
|
|
lv->length = p->header.maxslot;
|
|
dtlck->index++;
|
|
|
|
/* update the buffer extent descriptor of the dtpage */
|
|
xsize = xlen << JFS_SBI(ip->i_sb)->l2bsize;
|
|
|
|
/* unpin the relocated page */
|
|
DT_PUTPAGE(mp);
|
|
jfs_info("dtRelocate: target dtpage relocated.");
|
|
|
|
/* the moved extent is dtpage, then a LOG_NOREDOPAGE log rec
|
|
* needs to be written (in logredo(), the LOG_NOREDOPAGE log rec
|
|
* will also force a bmap update ).
|
|
*/
|
|
|
|
/*
|
|
* 3. acquire maplock for the source extent to be freed;
|
|
*/
|
|
/* for dtpage relocation, write a LOG_NOREDOPAGE record
|
|
* for the source dtpage (logredo() will init NoRedoPage
|
|
* filter and will also update bmap for free of the source
|
|
* dtpage), and upadte bmap for free of the source dtpage;
|
|
*/
|
|
tlck = txMaplock(tid, ip, tlckDTREE | tlckFREE);
|
|
pxdlock = (struct pxd_lock *) & tlck->lock;
|
|
pxdlock->flag = mlckFREEPXD;
|
|
PXDaddress(&pxdlock->pxd, oxaddr);
|
|
PXDlength(&pxdlock->pxd, xlen);
|
|
pxdlock->index = 1;
|
|
|
|
/*
|
|
* 4. update the parent router entry for relocation;
|
|
*
|
|
* acquire tlck for the parent entry covering the target dtpage;
|
|
* write LOG_REDOPAGE to apply after image only;
|
|
*/
|
|
jfs_info("dtRelocate: update parent router entry.");
|
|
tlck = txLock(tid, ip, pmp, tlckDTREE | tlckENTRY);
|
|
dtlck = (struct dt_lock *) & tlck->lock;
|
|
lv = & dtlck->lv[dtlck->index];
|
|
|
|
/* update the PXD with the new address */
|
|
stbl = DT_GETSTBL(pp);
|
|
pxd = (pxd_t *) & pp->slot[stbl[index]];
|
|
PXDaddress(pxd, nxaddr);
|
|
lv->offset = stbl[index];
|
|
lv->length = 1;
|
|
dtlck->index++;
|
|
|
|
/* unpin the parent dtpage */
|
|
DT_PUTPAGE(pmp);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* NAME: dtSearchNode()
|
|
*
|
|
* FUNCTION: Search for an dtpage containing a specified address
|
|
* This function is mainly used by defragfs utility.
|
|
*
|
|
* NOTE: Search result on stack, the found page is pinned at exit.
|
|
* The result page must be an internal dtpage.
|
|
* lmxaddr give the address of the left most page of the
|
|
* dtree level, in which the required dtpage resides.
|
|
*/
|
|
static int dtSearchNode(struct inode *ip, s64 lmxaddr, pxd_t * kpxd,
|
|
struct btstack * btstack)
|
|
{
|
|
int rc = 0;
|
|
s64 bn;
|
|
struct metapage *mp;
|
|
dtpage_t *p;
|
|
int psize = 288; /* initial in-line directory */
|
|
s8 *stbl;
|
|
int i;
|
|
pxd_t *pxd;
|
|
struct btframe *btsp;
|
|
|
|
BT_CLR(btstack); /* reset stack */
|
|
|
|
/*
|
|
* descend tree to the level with specified leftmost page
|
|
*
|
|
* by convention, root bn = 0.
|
|
*/
|
|
for (bn = 0;;) {
|
|
/* get/pin the page to search */
|
|
DT_GETPAGE(ip, bn, mp, psize, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* does the xaddr of leftmost page of the levevl
|
|
* matches levevl search key ?
|
|
*/
|
|
if (p->header.flag & BT_ROOT) {
|
|
if (lmxaddr == 0)
|
|
break;
|
|
} else if (addressPXD(&p->header.self) == lmxaddr)
|
|
break;
|
|
|
|
/*
|
|
* descend down to leftmost child page
|
|
*/
|
|
if (p->header.flag & BT_LEAF) {
|
|
DT_PUTPAGE(mp);
|
|
return -ESTALE;
|
|
}
|
|
|
|
/* get the leftmost entry */
|
|
stbl = DT_GETSTBL(p);
|
|
pxd = (pxd_t *) & p->slot[stbl[0]];
|
|
|
|
/* get the child page block address */
|
|
bn = addressPXD(pxd);
|
|
psize = lengthPXD(pxd) << JFS_SBI(ip->i_sb)->l2bsize;
|
|
/* unpin the parent page */
|
|
DT_PUTPAGE(mp);
|
|
}
|
|
|
|
/*
|
|
* search each page at the current levevl
|
|
*/
|
|
loop:
|
|
stbl = DT_GETSTBL(p);
|
|
for (i = 0; i < p->header.nextindex; i++) {
|
|
pxd = (pxd_t *) & p->slot[stbl[i]];
|
|
|
|
/* found the specified router entry */
|
|
if (addressPXD(pxd) == addressPXD(kpxd) &&
|
|
lengthPXD(pxd) == lengthPXD(kpxd)) {
|
|
btsp = btstack->top;
|
|
btsp->bn = bn;
|
|
btsp->index = i;
|
|
btsp->mp = mp;
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* get the right sibling page if any */
|
|
if (p->header.next)
|
|
bn = le64_to_cpu(p->header.next);
|
|
else {
|
|
DT_PUTPAGE(mp);
|
|
return -ESTALE;
|
|
}
|
|
|
|
/* unpin current page */
|
|
DT_PUTPAGE(mp);
|
|
|
|
/* get the right sibling page */
|
|
DT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
goto loop;
|
|
}
|
|
#endif /* _NOTYET */
|
|
|
|
/*
|
|
* dtRelink()
|
|
*
|
|
* function:
|
|
* link around a freed page.
|
|
*
|
|
* parameter:
|
|
* fp: page to be freed
|
|
*
|
|
* return:
|
|
*/
|
|
static int dtRelink(tid_t tid, struct inode *ip, dtpage_t * p)
|
|
{
|
|
int rc;
|
|
struct metapage *mp;
|
|
s64 nextbn, prevbn;
|
|
struct tlock *tlck;
|
|
struct dt_lock *dtlck;
|
|
struct lv *lv;
|
|
|
|
nextbn = le64_to_cpu(p->header.next);
|
|
prevbn = le64_to_cpu(p->header.prev);
|
|
|
|
/* update prev pointer of the next page */
|
|
if (nextbn != 0) {
|
|
DT_GETPAGE(ip, nextbn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
BT_MARK_DIRTY(mp, ip);
|
|
/*
|
|
* acquire a transaction lock on the next page
|
|
*
|
|
* action: update prev pointer;
|
|
*/
|
|
tlck = txLock(tid, ip, mp, tlckDTREE | tlckRELINK);
|
|
jfs_info("dtRelink nextbn: tlck = 0x%p, ip = 0x%p, mp=0x%p",
|
|
tlck, ip, mp);
|
|
dtlck = (struct dt_lock *) & tlck->lock;
|
|
|
|
/* linelock header */
|
|
if (dtlck->index >= dtlck->maxcnt)
|
|
dtlck = (struct dt_lock *) txLinelock(dtlck);
|
|
lv = & dtlck->lv[dtlck->index];
|
|
lv->offset = 0;
|
|
lv->length = 1;
|
|
dtlck->index++;
|
|
|
|
p->header.prev = cpu_to_le64(prevbn);
|
|
DT_PUTPAGE(mp);
|
|
}
|
|
|
|
/* update next pointer of the previous page */
|
|
if (prevbn != 0) {
|
|
DT_GETPAGE(ip, prevbn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
BT_MARK_DIRTY(mp, ip);
|
|
/*
|
|
* acquire a transaction lock on the prev page
|
|
*
|
|
* action: update next pointer;
|
|
*/
|
|
tlck = txLock(tid, ip, mp, tlckDTREE | tlckRELINK);
|
|
jfs_info("dtRelink prevbn: tlck = 0x%p, ip = 0x%p, mp=0x%p",
|
|
tlck, ip, mp);
|
|
dtlck = (struct dt_lock *) & tlck->lock;
|
|
|
|
/* linelock header */
|
|
if (dtlck->index >= dtlck->maxcnt)
|
|
dtlck = (struct dt_lock *) txLinelock(dtlck);
|
|
lv = & dtlck->lv[dtlck->index];
|
|
lv->offset = 0;
|
|
lv->length = 1;
|
|
dtlck->index++;
|
|
|
|
p->header.next = cpu_to_le64(nextbn);
|
|
DT_PUTPAGE(mp);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* dtInitRoot()
|
|
*
|
|
* initialize directory root (inline in inode)
|
|
*/
|
|
void dtInitRoot(tid_t tid, struct inode *ip, u32 idotdot)
|
|
{
|
|
struct jfs_inode_info *jfs_ip = JFS_IP(ip);
|
|
dtroot_t *p;
|
|
int fsi;
|
|
struct dtslot *f;
|
|
struct tlock *tlck;
|
|
struct dt_lock *dtlck;
|
|
struct lv *lv;
|
|
u16 xflag_save;
|
|
|
|
/*
|
|
* If this was previously an non-empty directory, we need to remove
|
|
* the old directory table.
|
|
*/
|
|
if (DO_INDEX(ip)) {
|
|
if (!jfs_dirtable_inline(ip)) {
|
|
struct tblock *tblk = tid_to_tblock(tid);
|
|
/*
|
|
* We're playing games with the tid's xflag. If
|
|
* we're removing a regular file, the file's xtree
|
|
* is committed with COMMIT_PMAP, but we always
|
|
* commit the directories xtree with COMMIT_PWMAP.
|
|
*/
|
|
xflag_save = tblk->xflag;
|
|
tblk->xflag = 0;
|
|
/*
|
|
* xtTruncate isn't guaranteed to fully truncate
|
|
* the xtree. The caller needs to check i_size
|
|
* after committing the transaction to see if
|
|
* additional truncation is needed. The
|
|
* COMMIT_Stale flag tells caller that we
|
|
* initiated the truncation.
|
|
*/
|
|
xtTruncate(tid, ip, 0, COMMIT_PWMAP);
|
|
set_cflag(COMMIT_Stale, ip);
|
|
|
|
tblk->xflag = xflag_save;
|
|
} else
|
|
ip->i_size = 1;
|
|
|
|
jfs_ip->next_index = 2;
|
|
} else
|
|
ip->i_size = IDATASIZE;
|
|
|
|
/*
|
|
* acquire a transaction lock on the root
|
|
*
|
|
* action: directory initialization;
|
|
*/
|
|
tlck = txLock(tid, ip, (struct metapage *) & jfs_ip->bxflag,
|
|
tlckDTREE | tlckENTRY | tlckBTROOT);
|
|
dtlck = (struct dt_lock *) & tlck->lock;
|
|
|
|
/* linelock root */
|
|
ASSERT(dtlck->index == 0);
|
|
lv = & dtlck->lv[0];
|
|
lv->offset = 0;
|
|
lv->length = DTROOTMAXSLOT;
|
|
dtlck->index++;
|
|
|
|
p = &jfs_ip->i_dtroot;
|
|
|
|
p->header.flag = DXD_INDEX | BT_ROOT | BT_LEAF;
|
|
|
|
p->header.nextindex = 0;
|
|
|
|
/* init freelist */
|
|
fsi = 1;
|
|
f = &p->slot[fsi];
|
|
|
|
/* init data area of root */
|
|
for (fsi++; fsi < DTROOTMAXSLOT; f++, fsi++)
|
|
f->next = fsi;
|
|
f->next = -1;
|
|
|
|
p->header.freelist = 1;
|
|
p->header.freecnt = 8;
|
|
|
|
/* init '..' entry */
|
|
p->header.idotdot = cpu_to_le32(idotdot);
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* add_missing_indices()
|
|
*
|
|
* function: Fix dtree page in which one or more entries has an invalid index.
|
|
* fsck.jfs should really fix this, but it currently does not.
|
|
* Called from jfs_readdir when bad index is detected.
|
|
*/
|
|
static void add_missing_indices(struct inode *inode, s64 bn)
|
|
{
|
|
struct ldtentry *d;
|
|
struct dt_lock *dtlck;
|
|
int i;
|
|
uint index;
|
|
struct lv *lv;
|
|
struct metapage *mp;
|
|
dtpage_t *p;
|
|
int rc;
|
|
s8 *stbl;
|
|
tid_t tid;
|
|
struct tlock *tlck;
|
|
|
|
tid = txBegin(inode->i_sb, 0);
|
|
|
|
DT_GETPAGE(inode, bn, mp, PSIZE, p, rc);
|
|
|
|
if (rc) {
|
|
printk(KERN_ERR "DT_GETPAGE failed!\n");
|
|
goto end;
|
|
}
|
|
BT_MARK_DIRTY(mp, inode);
|
|
|
|
ASSERT(p->header.flag & BT_LEAF);
|
|
|
|
tlck = txLock(tid, inode, mp, tlckDTREE | tlckENTRY);
|
|
if (BT_IS_ROOT(mp))
|
|
tlck->type |= tlckBTROOT;
|
|
|
|
dtlck = (struct dt_lock *) &tlck->lock;
|
|
|
|
stbl = DT_GETSTBL(p);
|
|
for (i = 0; i < p->header.nextindex; i++) {
|
|
d = (struct ldtentry *) &p->slot[stbl[i]];
|
|
index = le32_to_cpu(d->index);
|
|
if ((index < 2) || (index >= JFS_IP(inode)->next_index)) {
|
|
d->index = cpu_to_le32(add_index(tid, inode, bn, i));
|
|
if (dtlck->index >= dtlck->maxcnt)
|
|
dtlck = (struct dt_lock *) txLinelock(dtlck);
|
|
lv = &dtlck->lv[dtlck->index];
|
|
lv->offset = stbl[i];
|
|
lv->length = 1;
|
|
dtlck->index++;
|
|
}
|
|
}
|
|
|
|
DT_PUTPAGE(mp);
|
|
(void) txCommit(tid, 1, &inode, 0);
|
|
end:
|
|
txEnd(tid);
|
|
}
|
|
|
|
/*
|
|
* Buffer to hold directory entry info while traversing a dtree page
|
|
* before being fed to the filldir function
|
|
*/
|
|
struct jfs_dirent {
|
|
loff_t position;
|
|
int ino;
|
|
u16 name_len;
|
|
char name[];
|
|
};
|
|
|
|
/*
|
|
* function to determine next variable-sized jfs_dirent in buffer
|
|
*/
|
|
static inline struct jfs_dirent *next_jfs_dirent(struct jfs_dirent *dirent)
|
|
{
|
|
return (struct jfs_dirent *)
|
|
((char *)dirent +
|
|
((sizeof (struct jfs_dirent) + dirent->name_len + 1 +
|
|
sizeof (loff_t) - 1) &
|
|
~(sizeof (loff_t) - 1)));
|
|
}
|
|
|
|
/*
|
|
* jfs_readdir()
|
|
*
|
|
* function: read directory entries sequentially
|
|
* from the specified entry offset
|
|
*
|
|
* parameter:
|
|
*
|
|
* return: offset = (pn, index) of start entry
|
|
* of next jfs_readdir()/dtRead()
|
|
*/
|
|
int jfs_readdir(struct file *file, struct dir_context *ctx)
|
|
{
|
|
struct inode *ip = file_inode(file);
|
|
struct nls_table *codepage = JFS_SBI(ip->i_sb)->nls_tab;
|
|
int rc = 0;
|
|
loff_t dtpos; /* legacy OS/2 style position */
|
|
struct dtoffset {
|
|
s16 pn;
|
|
s16 index;
|
|
s32 unused;
|
|
} *dtoffset = (struct dtoffset *) &dtpos;
|
|
s64 bn;
|
|
struct metapage *mp;
|
|
dtpage_t *p;
|
|
int index;
|
|
s8 *stbl;
|
|
struct btstack btstack;
|
|
int i, next;
|
|
struct ldtentry *d;
|
|
struct dtslot *t;
|
|
int d_namleft, len, outlen;
|
|
unsigned long dirent_buf;
|
|
char *name_ptr;
|
|
u32 dir_index;
|
|
int do_index = 0;
|
|
uint loop_count = 0;
|
|
struct jfs_dirent *jfs_dirent;
|
|
int jfs_dirents;
|
|
int overflow, fix_page, page_fixed = 0;
|
|
static int unique_pos = 2; /* If we can't fix broken index */
|
|
|
|
if (ctx->pos == DIREND)
|
|
return 0;
|
|
|
|
if (DO_INDEX(ip)) {
|
|
/*
|
|
* persistent index is stored in directory entries.
|
|
* Special cases: 0 = .
|
|
* 1 = ..
|
|
* -1 = End of directory
|
|
*/
|
|
do_index = 1;
|
|
|
|
dir_index = (u32) ctx->pos;
|
|
|
|
/*
|
|
* NFSv4 reserves cookies 1 and 2 for . and .. so the value
|
|
* we return to the vfs is one greater than the one we use
|
|
* internally.
|
|
*/
|
|
if (dir_index)
|
|
dir_index--;
|
|
|
|
if (dir_index > 1) {
|
|
struct dir_table_slot dirtab_slot;
|
|
|
|
if (dtEmpty(ip) ||
|
|
(dir_index >= JFS_IP(ip)->next_index)) {
|
|
/* Stale position. Directory has shrunk */
|
|
ctx->pos = DIREND;
|
|
return 0;
|
|
}
|
|
repeat:
|
|
rc = read_index(ip, dir_index, &dirtab_slot);
|
|
if (rc) {
|
|
ctx->pos = DIREND;
|
|
return rc;
|
|
}
|
|
if (dirtab_slot.flag == DIR_INDEX_FREE) {
|
|
if (loop_count++ > JFS_IP(ip)->next_index) {
|
|
jfs_err("jfs_readdir detected infinite loop!");
|
|
ctx->pos = DIREND;
|
|
return 0;
|
|
}
|
|
dir_index = le32_to_cpu(dirtab_slot.addr2);
|
|
if (dir_index == -1) {
|
|
ctx->pos = DIREND;
|
|
return 0;
|
|
}
|
|
goto repeat;
|
|
}
|
|
bn = addressDTS(&dirtab_slot);
|
|
index = dirtab_slot.slot;
|
|
DT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc) {
|
|
ctx->pos = DIREND;
|
|
return 0;
|
|
}
|
|
if (p->header.flag & BT_INTERNAL) {
|
|
jfs_err("jfs_readdir: bad index table");
|
|
DT_PUTPAGE(mp);
|
|
ctx->pos = DIREND;
|
|
return 0;
|
|
}
|
|
} else {
|
|
if (dir_index == 0) {
|
|
/*
|
|
* self "."
|
|
*/
|
|
ctx->pos = 1;
|
|
if (!dir_emit(ctx, ".", 1, ip->i_ino, DT_DIR))
|
|
return 0;
|
|
}
|
|
/*
|
|
* parent ".."
|
|
*/
|
|
ctx->pos = 2;
|
|
if (!dir_emit(ctx, "..", 2, PARENT(ip), DT_DIR))
|
|
return 0;
|
|
|
|
/*
|
|
* Find first entry of left-most leaf
|
|
*/
|
|
if (dtEmpty(ip)) {
|
|
ctx->pos = DIREND;
|
|
return 0;
|
|
}
|
|
|
|
if ((rc = dtReadFirst(ip, &btstack)))
|
|
return rc;
|
|
|
|
DT_GETSEARCH(ip, btstack.top, bn, mp, p, index);
|
|
}
|
|
} else {
|
|
/*
|
|
* Legacy filesystem - OS/2 & Linux JFS < 0.3.6
|
|
*
|
|
* pn = 0; index = 1: First entry "."
|
|
* pn = 0; index = 2: Second entry ".."
|
|
* pn > 0: Real entries, pn=1 -> leftmost page
|
|
* pn = index = -1: No more entries
|
|
*/
|
|
dtpos = ctx->pos;
|
|
if (dtpos < 2) {
|
|
/* build "." entry */
|
|
ctx->pos = 1;
|
|
if (!dir_emit(ctx, ".", 1, ip->i_ino, DT_DIR))
|
|
return 0;
|
|
dtoffset->index = 2;
|
|
ctx->pos = dtpos;
|
|
}
|
|
|
|
if (dtoffset->pn == 0) {
|
|
if (dtoffset->index == 2) {
|
|
/* build ".." entry */
|
|
if (!dir_emit(ctx, "..", 2, PARENT(ip), DT_DIR))
|
|
return 0;
|
|
} else {
|
|
jfs_err("jfs_readdir called with invalid offset!");
|
|
}
|
|
dtoffset->pn = 1;
|
|
dtoffset->index = 0;
|
|
ctx->pos = dtpos;
|
|
}
|
|
|
|
if (dtEmpty(ip)) {
|
|
ctx->pos = DIREND;
|
|
return 0;
|
|
}
|
|
|
|
if ((rc = dtReadNext(ip, &ctx->pos, &btstack))) {
|
|
jfs_err("jfs_readdir: unexpected rc = %d from dtReadNext",
|
|
rc);
|
|
ctx->pos = DIREND;
|
|
return 0;
|
|
}
|
|
/* get start leaf page and index */
|
|
DT_GETSEARCH(ip, btstack.top, bn, mp, p, index);
|
|
|
|
/* offset beyond directory eof ? */
|
|
if (bn < 0) {
|
|
ctx->pos = DIREND;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
dirent_buf = __get_free_page(GFP_KERNEL);
|
|
if (dirent_buf == 0) {
|
|
DT_PUTPAGE(mp);
|
|
jfs_warn("jfs_readdir: __get_free_page failed!");
|
|
ctx->pos = DIREND;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
while (1) {
|
|
jfs_dirent = (struct jfs_dirent *) dirent_buf;
|
|
jfs_dirents = 0;
|
|
overflow = fix_page = 0;
|
|
|
|
stbl = DT_GETSTBL(p);
|
|
|
|
for (i = index; i < p->header.nextindex; i++) {
|
|
d = (struct ldtentry *) & p->slot[stbl[i]];
|
|
|
|
if (((long) jfs_dirent + d->namlen + 1) >
|
|
(dirent_buf + PAGE_SIZE)) {
|
|
/* DBCS codepages could overrun dirent_buf */
|
|
index = i;
|
|
overflow = 1;
|
|
break;
|
|
}
|
|
|
|
d_namleft = d->namlen;
|
|
name_ptr = jfs_dirent->name;
|
|
jfs_dirent->ino = le32_to_cpu(d->inumber);
|
|
|
|
if (do_index) {
|
|
len = min(d_namleft, DTLHDRDATALEN);
|
|
jfs_dirent->position = le32_to_cpu(d->index);
|
|
/*
|
|
* d->index should always be valid, but it
|
|
* isn't. fsck.jfs doesn't create the
|
|
* directory index for the lost+found
|
|
* directory. Rather than let it go,
|
|
* we can try to fix it.
|
|
*/
|
|
if ((jfs_dirent->position < 2) ||
|
|
(jfs_dirent->position >=
|
|
JFS_IP(ip)->next_index)) {
|
|
if (!page_fixed && !isReadOnly(ip)) {
|
|
fix_page = 1;
|
|
/*
|
|
* setting overflow and setting
|
|
* index to i will cause the
|
|
* same page to be processed
|
|
* again starting here
|
|
*/
|
|
overflow = 1;
|
|
index = i;
|
|
break;
|
|
}
|
|
jfs_dirent->position = unique_pos++;
|
|
}
|
|
/*
|
|
* We add 1 to the index because we may
|
|
* use a value of 2 internally, and NFSv4
|
|
* doesn't like that.
|
|
*/
|
|
jfs_dirent->position++;
|
|
} else {
|
|
jfs_dirent->position = dtpos;
|
|
len = min(d_namleft, DTLHDRDATALEN_LEGACY);
|
|
}
|
|
|
|
/* copy the name of head/only segment */
|
|
outlen = jfs_strfromUCS_le(name_ptr, d->name, len,
|
|
codepage);
|
|
jfs_dirent->name_len = outlen;
|
|
|
|
/* copy name in the additional segment(s) */
|
|
next = d->next;
|
|
while (next >= 0) {
|
|
t = (struct dtslot *) & p->slot[next];
|
|
name_ptr += outlen;
|
|
d_namleft -= len;
|
|
/* Sanity Check */
|
|
if (d_namleft == 0) {
|
|
jfs_error(ip->i_sb,
|
|
"JFS:Dtree error: ino = %ld, bn=%lld, index = %d\n",
|
|
(long)ip->i_ino,
|
|
(long long)bn,
|
|
i);
|
|
goto skip_one;
|
|
}
|
|
len = min(d_namleft, DTSLOTDATALEN);
|
|
outlen = jfs_strfromUCS_le(name_ptr, t->name,
|
|
len, codepage);
|
|
jfs_dirent->name_len += outlen;
|
|
|
|
next = t->next;
|
|
}
|
|
|
|
jfs_dirents++;
|
|
jfs_dirent = next_jfs_dirent(jfs_dirent);
|
|
skip_one:
|
|
if (!do_index)
|
|
dtoffset->index++;
|
|
}
|
|
|
|
if (!overflow) {
|
|
/* Point to next leaf page */
|
|
if (p->header.flag & BT_ROOT)
|
|
bn = 0;
|
|
else {
|
|
bn = le64_to_cpu(p->header.next);
|
|
index = 0;
|
|
/* update offset (pn:index) for new page */
|
|
if (!do_index) {
|
|
dtoffset->pn++;
|
|
dtoffset->index = 0;
|
|
}
|
|
}
|
|
page_fixed = 0;
|
|
}
|
|
|
|
/* unpin previous leaf page */
|
|
DT_PUTPAGE(mp);
|
|
|
|
jfs_dirent = (struct jfs_dirent *) dirent_buf;
|
|
while (jfs_dirents--) {
|
|
ctx->pos = jfs_dirent->position;
|
|
if (!dir_emit(ctx, jfs_dirent->name,
|
|
jfs_dirent->name_len,
|
|
jfs_dirent->ino, DT_UNKNOWN))
|
|
goto out;
|
|
jfs_dirent = next_jfs_dirent(jfs_dirent);
|
|
}
|
|
|
|
if (fix_page) {
|
|
add_missing_indices(ip, bn);
|
|
page_fixed = 1;
|
|
}
|
|
|
|
if (!overflow && (bn == 0)) {
|
|
ctx->pos = DIREND;
|
|
break;
|
|
}
|
|
|
|
DT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc) {
|
|
free_page(dirent_buf);
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
out:
|
|
free_page(dirent_buf);
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
/*
|
|
* dtReadFirst()
|
|
*
|
|
* function: get the leftmost page of the directory
|
|
*/
|
|
static int dtReadFirst(struct inode *ip, struct btstack * btstack)
|
|
{
|
|
int rc = 0;
|
|
s64 bn;
|
|
int psize = 288; /* initial in-line directory */
|
|
struct metapage *mp;
|
|
dtpage_t *p;
|
|
s8 *stbl;
|
|
struct btframe *btsp;
|
|
pxd_t *xd;
|
|
|
|
BT_CLR(btstack); /* reset stack */
|
|
|
|
/*
|
|
* descend leftmost path of the tree
|
|
*
|
|
* by convention, root bn = 0.
|
|
*/
|
|
for (bn = 0;;) {
|
|
DT_GETPAGE(ip, bn, mp, psize, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/*
|
|
* leftmost leaf page
|
|
*/
|
|
if (p->header.flag & BT_LEAF) {
|
|
/* return leftmost entry */
|
|
btsp = btstack->top;
|
|
btsp->bn = bn;
|
|
btsp->index = 0;
|
|
btsp->mp = mp;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* descend down to leftmost child page
|
|
*/
|
|
if (BT_STACK_FULL(btstack)) {
|
|
DT_PUTPAGE(mp);
|
|
jfs_error(ip->i_sb, "btstack overrun\n");
|
|
BT_STACK_DUMP(btstack);
|
|
return -EIO;
|
|
}
|
|
/* push (bn, index) of the parent page/entry */
|
|
BT_PUSH(btstack, bn, 0);
|
|
|
|
/* get the leftmost entry */
|
|
stbl = DT_GETSTBL(p);
|
|
xd = (pxd_t *) & p->slot[stbl[0]];
|
|
|
|
/* get the child page block address */
|
|
bn = addressPXD(xd);
|
|
psize = lengthPXD(xd) << JFS_SBI(ip->i_sb)->l2bsize;
|
|
|
|
/* unpin the parent page */
|
|
DT_PUTPAGE(mp);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* dtReadNext()
|
|
*
|
|
* function: get the page of the specified offset (pn:index)
|
|
*
|
|
* return: if (offset > eof), bn = -1;
|
|
*
|
|
* note: if index > nextindex of the target leaf page,
|
|
* start with 1st entry of next leaf page;
|
|
*/
|
|
static int dtReadNext(struct inode *ip, loff_t * offset,
|
|
struct btstack * btstack)
|
|
{
|
|
int rc = 0;
|
|
struct dtoffset {
|
|
s16 pn;
|
|
s16 index;
|
|
s32 unused;
|
|
} *dtoffset = (struct dtoffset *) offset;
|
|
s64 bn;
|
|
struct metapage *mp;
|
|
dtpage_t *p;
|
|
int index;
|
|
int pn;
|
|
s8 *stbl;
|
|
struct btframe *btsp, *parent;
|
|
pxd_t *xd;
|
|
|
|
/*
|
|
* get leftmost leaf page pinned
|
|
*/
|
|
if ((rc = dtReadFirst(ip, btstack)))
|
|
return rc;
|
|
|
|
/* get leaf page */
|
|
DT_GETSEARCH(ip, btstack->top, bn, mp, p, index);
|
|
|
|
/* get the start offset (pn:index) */
|
|
pn = dtoffset->pn - 1; /* Now pn = 0 represents leftmost leaf */
|
|
index = dtoffset->index;
|
|
|
|
/* start at leftmost page ? */
|
|
if (pn == 0) {
|
|
/* offset beyond eof ? */
|
|
if (index < p->header.nextindex)
|
|
goto out;
|
|
|
|
if (p->header.flag & BT_ROOT) {
|
|
bn = -1;
|
|
goto out;
|
|
}
|
|
|
|
/* start with 1st entry of next leaf page */
|
|
dtoffset->pn++;
|
|
dtoffset->index = index = 0;
|
|
goto a;
|
|
}
|
|
|
|
/* start at non-leftmost page: scan parent pages for large pn */
|
|
if (p->header.flag & BT_ROOT) {
|
|
bn = -1;
|
|
goto out;
|
|
}
|
|
|
|
/* start after next leaf page ? */
|
|
if (pn > 1)
|
|
goto b;
|
|
|
|
/* get leaf page pn = 1 */
|
|
a:
|
|
bn = le64_to_cpu(p->header.next);
|
|
|
|
/* unpin leaf page */
|
|
DT_PUTPAGE(mp);
|
|
|
|
/* offset beyond eof ? */
|
|
if (bn == 0) {
|
|
bn = -1;
|
|
goto out;
|
|
}
|
|
|
|
goto c;
|
|
|
|
/*
|
|
* scan last internal page level to get target leaf page
|
|
*/
|
|
b:
|
|
/* unpin leftmost leaf page */
|
|
DT_PUTPAGE(mp);
|
|
|
|
/* get left most parent page */
|
|
btsp = btstack->top;
|
|
parent = btsp - 1;
|
|
bn = parent->bn;
|
|
DT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* scan parent pages at last internal page level */
|
|
while (pn >= p->header.nextindex) {
|
|
pn -= p->header.nextindex;
|
|
|
|
/* get next parent page address */
|
|
bn = le64_to_cpu(p->header.next);
|
|
|
|
/* unpin current parent page */
|
|
DT_PUTPAGE(mp);
|
|
|
|
/* offset beyond eof ? */
|
|
if (bn == 0) {
|
|
bn = -1;
|
|
goto out;
|
|
}
|
|
|
|
/* get next parent page */
|
|
DT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* update parent page stack frame */
|
|
parent->bn = bn;
|
|
}
|
|
|
|
/* get leaf page address */
|
|
stbl = DT_GETSTBL(p);
|
|
xd = (pxd_t *) & p->slot[stbl[pn]];
|
|
bn = addressPXD(xd);
|
|
|
|
/* unpin parent page */
|
|
DT_PUTPAGE(mp);
|
|
|
|
/*
|
|
* get target leaf page
|
|
*/
|
|
c:
|
|
DT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/*
|
|
* leaf page has been completed:
|
|
* start with 1st entry of next leaf page
|
|
*/
|
|
if (index >= p->header.nextindex) {
|
|
bn = le64_to_cpu(p->header.next);
|
|
|
|
/* unpin leaf page */
|
|
DT_PUTPAGE(mp);
|
|
|
|
/* offset beyond eof ? */
|
|
if (bn == 0) {
|
|
bn = -1;
|
|
goto out;
|
|
}
|
|
|
|
/* get next leaf page */
|
|
DT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* start with 1st entry of next leaf page */
|
|
dtoffset->pn++;
|
|
dtoffset->index = 0;
|
|
}
|
|
|
|
out:
|
|
/* return target leaf page pinned */
|
|
btsp = btstack->top;
|
|
btsp->bn = bn;
|
|
btsp->index = dtoffset->index;
|
|
btsp->mp = mp;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* dtCompare()
|
|
*
|
|
* function: compare search key with an internal entry
|
|
*
|
|
* return:
|
|
* < 0 if k is < record
|
|
* = 0 if k is = record
|
|
* > 0 if k is > record
|
|
*/
|
|
static int dtCompare(struct component_name * key, /* search key */
|
|
dtpage_t * p, /* directory page */
|
|
int si)
|
|
{ /* entry slot index */
|
|
wchar_t *kname;
|
|
__le16 *name;
|
|
int klen, namlen, len, rc;
|
|
struct idtentry *ih;
|
|
struct dtslot *t;
|
|
|
|
/*
|
|
* force the left-most key on internal pages, at any level of
|
|
* the tree, to be less than any search key.
|
|
* this obviates having to update the leftmost key on an internal
|
|
* page when the user inserts a new key in the tree smaller than
|
|
* anything that has been stored.
|
|
*
|
|
* (? if/when dtSearch() narrows down to 1st entry (index = 0),
|
|
* at any internal page at any level of the tree,
|
|
* it descends to child of the entry anyway -
|
|
* ? make the entry as min size dummy entry)
|
|
*
|
|
* if (e->index == 0 && h->prevpg == P_INVALID && !(h->flags & BT_LEAF))
|
|
* return (1);
|
|
*/
|
|
|
|
kname = key->name;
|
|
klen = key->namlen;
|
|
|
|
ih = (struct idtentry *) & p->slot[si];
|
|
si = ih->next;
|
|
name = ih->name;
|
|
namlen = ih->namlen;
|
|
len = min(namlen, DTIHDRDATALEN);
|
|
|
|
/* compare with head/only segment */
|
|
len = min(klen, len);
|
|
if ((rc = UniStrncmp_le(kname, name, len)))
|
|
return rc;
|
|
|
|
klen -= len;
|
|
namlen -= len;
|
|
|
|
/* compare with additional segment(s) */
|
|
kname += len;
|
|
while (klen > 0 && namlen > 0) {
|
|
/* compare with next name segment */
|
|
t = (struct dtslot *) & p->slot[si];
|
|
len = min(namlen, DTSLOTDATALEN);
|
|
len = min(klen, len);
|
|
name = t->name;
|
|
if ((rc = UniStrncmp_le(kname, name, len)))
|
|
return rc;
|
|
|
|
klen -= len;
|
|
namlen -= len;
|
|
kname += len;
|
|
si = t->next;
|
|
}
|
|
|
|
return (klen - namlen);
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
* ciCompare()
|
|
*
|
|
* function: compare search key with an (leaf/internal) entry
|
|
*
|
|
* return:
|
|
* < 0 if k is < record
|
|
* = 0 if k is = record
|
|
* > 0 if k is > record
|
|
*/
|
|
static int ciCompare(struct component_name * key, /* search key */
|
|
dtpage_t * p, /* directory page */
|
|
int si, /* entry slot index */
|
|
int flag)
|
|
{
|
|
wchar_t *kname, x;
|
|
__le16 *name;
|
|
int klen, namlen, len, rc;
|
|
struct ldtentry *lh;
|
|
struct idtentry *ih;
|
|
struct dtslot *t;
|
|
int i;
|
|
|
|
/*
|
|
* force the left-most key on internal pages, at any level of
|
|
* the tree, to be less than any search key.
|
|
* this obviates having to update the leftmost key on an internal
|
|
* page when the user inserts a new key in the tree smaller than
|
|
* anything that has been stored.
|
|
*
|
|
* (? if/when dtSearch() narrows down to 1st entry (index = 0),
|
|
* at any internal page at any level of the tree,
|
|
* it descends to child of the entry anyway -
|
|
* ? make the entry as min size dummy entry)
|
|
*
|
|
* if (e->index == 0 && h->prevpg == P_INVALID && !(h->flags & BT_LEAF))
|
|
* return (1);
|
|
*/
|
|
|
|
kname = key->name;
|
|
klen = key->namlen;
|
|
|
|
/*
|
|
* leaf page entry
|
|
*/
|
|
if (p->header.flag & BT_LEAF) {
|
|
lh = (struct ldtentry *) & p->slot[si];
|
|
si = lh->next;
|
|
name = lh->name;
|
|
namlen = lh->namlen;
|
|
if (flag & JFS_DIR_INDEX)
|
|
len = min(namlen, DTLHDRDATALEN);
|
|
else
|
|
len = min(namlen, DTLHDRDATALEN_LEGACY);
|
|
}
|
|
/*
|
|
* internal page entry
|
|
*/
|
|
else {
|
|
ih = (struct idtentry *) & p->slot[si];
|
|
si = ih->next;
|
|
name = ih->name;
|
|
namlen = ih->namlen;
|
|
len = min(namlen, DTIHDRDATALEN);
|
|
}
|
|
|
|
/* compare with head/only segment */
|
|
len = min(klen, len);
|
|
for (i = 0; i < len; i++, kname++, name++) {
|
|
/* only uppercase if case-insensitive support is on */
|
|
if ((flag & JFS_OS2) == JFS_OS2)
|
|
x = UniToupper(le16_to_cpu(*name));
|
|
else
|
|
x = le16_to_cpu(*name);
|
|
if ((rc = *kname - x))
|
|
return rc;
|
|
}
|
|
|
|
klen -= len;
|
|
namlen -= len;
|
|
|
|
/* compare with additional segment(s) */
|
|
while (klen > 0 && namlen > 0) {
|
|
/* compare with next name segment */
|
|
t = (struct dtslot *) & p->slot[si];
|
|
len = min(namlen, DTSLOTDATALEN);
|
|
len = min(klen, len);
|
|
name = t->name;
|
|
for (i = 0; i < len; i++, kname++, name++) {
|
|
/* only uppercase if case-insensitive support is on */
|
|
if ((flag & JFS_OS2) == JFS_OS2)
|
|
x = UniToupper(le16_to_cpu(*name));
|
|
else
|
|
x = le16_to_cpu(*name);
|
|
|
|
if ((rc = *kname - x))
|
|
return rc;
|
|
}
|
|
|
|
klen -= len;
|
|
namlen -= len;
|
|
si = t->next;
|
|
}
|
|
|
|
return (klen - namlen);
|
|
}
|
|
|
|
|
|
/*
|
|
* ciGetLeafPrefixKey()
|
|
*
|
|
* function: compute prefix of suffix compression
|
|
* from two adjacent leaf entries
|
|
* across page boundary
|
|
*
|
|
* return: non-zero on error
|
|
*
|
|
*/
|
|
static int ciGetLeafPrefixKey(dtpage_t * lp, int li, dtpage_t * rp,
|
|
int ri, struct component_name * key, int flag)
|
|
{
|
|
int klen, namlen;
|
|
wchar_t *pl, *pr, *kname;
|
|
struct component_name lkey;
|
|
struct component_name rkey;
|
|
|
|
lkey.name = kmalloc_array(JFS_NAME_MAX + 1, sizeof(wchar_t),
|
|
GFP_KERNEL);
|
|
if (lkey.name == NULL)
|
|
return -ENOMEM;
|
|
|
|
rkey.name = kmalloc_array(JFS_NAME_MAX + 1, sizeof(wchar_t),
|
|
GFP_KERNEL);
|
|
if (rkey.name == NULL) {
|
|
kfree(lkey.name);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* get left and right key */
|
|
dtGetKey(lp, li, &lkey, flag);
|
|
lkey.name[lkey.namlen] = 0;
|
|
|
|
if ((flag & JFS_OS2) == JFS_OS2)
|
|
ciToUpper(&lkey);
|
|
|
|
dtGetKey(rp, ri, &rkey, flag);
|
|
rkey.name[rkey.namlen] = 0;
|
|
|
|
|
|
if ((flag & JFS_OS2) == JFS_OS2)
|
|
ciToUpper(&rkey);
|
|
|
|
/* compute prefix */
|
|
klen = 0;
|
|
kname = key->name;
|
|
namlen = min(lkey.namlen, rkey.namlen);
|
|
for (pl = lkey.name, pr = rkey.name;
|
|
namlen; pl++, pr++, namlen--, klen++, kname++) {
|
|
*kname = *pr;
|
|
if (*pl != *pr) {
|
|
key->namlen = klen + 1;
|
|
goto free_names;
|
|
}
|
|
}
|
|
|
|
/* l->namlen <= r->namlen since l <= r */
|
|
if (lkey.namlen < rkey.namlen) {
|
|
*kname = *pr;
|
|
key->namlen = klen + 1;
|
|
} else /* l->namelen == r->namelen */
|
|
key->namlen = klen;
|
|
|
|
free_names:
|
|
kfree(lkey.name);
|
|
kfree(rkey.name);
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* dtGetKey()
|
|
*
|
|
* function: get key of the entry
|
|
*/
|
|
static void dtGetKey(dtpage_t * p, int i, /* entry index */
|
|
struct component_name * key, int flag)
|
|
{
|
|
int si;
|
|
s8 *stbl;
|
|
struct ldtentry *lh;
|
|
struct idtentry *ih;
|
|
struct dtslot *t;
|
|
int namlen, len;
|
|
wchar_t *kname;
|
|
__le16 *name;
|
|
|
|
/* get entry */
|
|
stbl = DT_GETSTBL(p);
|
|
si = stbl[i];
|
|
if (p->header.flag & BT_LEAF) {
|
|
lh = (struct ldtentry *) & p->slot[si];
|
|
si = lh->next;
|
|
namlen = lh->namlen;
|
|
name = lh->name;
|
|
if (flag & JFS_DIR_INDEX)
|
|
len = min(namlen, DTLHDRDATALEN);
|
|
else
|
|
len = min(namlen, DTLHDRDATALEN_LEGACY);
|
|
} else {
|
|
ih = (struct idtentry *) & p->slot[si];
|
|
si = ih->next;
|
|
namlen = ih->namlen;
|
|
name = ih->name;
|
|
len = min(namlen, DTIHDRDATALEN);
|
|
}
|
|
|
|
key->namlen = namlen;
|
|
kname = key->name;
|
|
|
|
/*
|
|
* move head/only segment
|
|
*/
|
|
UniStrncpy_from_le(kname, name, len);
|
|
|
|
/*
|
|
* move additional segment(s)
|
|
*/
|
|
while (si >= 0) {
|
|
/* get next segment */
|
|
t = &p->slot[si];
|
|
kname += len;
|
|
namlen -= len;
|
|
len = min(namlen, DTSLOTDATALEN);
|
|
UniStrncpy_from_le(kname, t->name, len);
|
|
|
|
si = t->next;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* dtInsertEntry()
|
|
*
|
|
* function: allocate free slot(s) and
|
|
* write a leaf/internal entry
|
|
*
|
|
* return: entry slot index
|
|
*/
|
|
static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
|
|
ddata_t * data, struct dt_lock ** dtlock)
|
|
{
|
|
struct dtslot *h, *t;
|
|
struct ldtentry *lh = NULL;
|
|
struct idtentry *ih = NULL;
|
|
int hsi, fsi, klen, len, nextindex;
|
|
wchar_t *kname;
|
|
__le16 *name;
|
|
s8 *stbl;
|
|
pxd_t *xd;
|
|
struct dt_lock *dtlck = *dtlock;
|
|
struct lv *lv;
|
|
int xsi, n;
|
|
s64 bn = 0;
|
|
struct metapage *mp = NULL;
|
|
|
|
klen = key->namlen;
|
|
kname = key->name;
|
|
|
|
/* allocate a free slot */
|
|
hsi = fsi = p->header.freelist;
|
|
h = &p->slot[fsi];
|
|
p->header.freelist = h->next;
|
|
--p->header.freecnt;
|
|
|
|
/* open new linelock */
|
|
if (dtlck->index >= dtlck->maxcnt)
|
|
dtlck = (struct dt_lock *) txLinelock(dtlck);
|
|
|
|
lv = & dtlck->lv[dtlck->index];
|
|
lv->offset = hsi;
|
|
|
|
/* write head/only segment */
|
|
if (p->header.flag & BT_LEAF) {
|
|
lh = (struct ldtentry *) h;
|
|
lh->next = h->next;
|
|
lh->inumber = cpu_to_le32(data->leaf.ino);
|
|
lh->namlen = klen;
|
|
name = lh->name;
|
|
if (data->leaf.ip) {
|
|
len = min(klen, DTLHDRDATALEN);
|
|
if (!(p->header.flag & BT_ROOT))
|
|
bn = addressPXD(&p->header.self);
|
|
lh->index = cpu_to_le32(add_index(data->leaf.tid,
|
|
data->leaf.ip,
|
|
bn, index));
|
|
} else
|
|
len = min(klen, DTLHDRDATALEN_LEGACY);
|
|
} else {
|
|
ih = (struct idtentry *) h;
|
|
ih->next = h->next;
|
|
xd = (pxd_t *) ih;
|
|
*xd = data->xd;
|
|
ih->namlen = klen;
|
|
name = ih->name;
|
|
len = min(klen, DTIHDRDATALEN);
|
|
}
|
|
|
|
UniStrncpy_to_le(name, kname, len);
|
|
|
|
n = 1;
|
|
xsi = hsi;
|
|
|
|
/* write additional segment(s) */
|
|
t = h;
|
|
klen -= len;
|
|
while (klen) {
|
|
/* get free slot */
|
|
fsi = p->header.freelist;
|
|
t = &p->slot[fsi];
|
|
p->header.freelist = t->next;
|
|
--p->header.freecnt;
|
|
|
|
/* is next slot contiguous ? */
|
|
if (fsi != xsi + 1) {
|
|
/* close current linelock */
|
|
lv->length = n;
|
|
dtlck->index++;
|
|
|
|
/* open new linelock */
|
|
if (dtlck->index < dtlck->maxcnt)
|
|
lv++;
|
|
else {
|
|
dtlck = (struct dt_lock *) txLinelock(dtlck);
|
|
lv = & dtlck->lv[0];
|
|
}
|
|
|
|
lv->offset = fsi;
|
|
n = 0;
|
|
}
|
|
|
|
kname += len;
|
|
len = min(klen, DTSLOTDATALEN);
|
|
UniStrncpy_to_le(t->name, kname, len);
|
|
|
|
n++;
|
|
xsi = fsi;
|
|
klen -= len;
|
|
}
|
|
|
|
/* close current linelock */
|
|
lv->length = n;
|
|
dtlck->index++;
|
|
|
|
*dtlock = dtlck;
|
|
|
|
/* terminate last/only segment */
|
|
if (h == t) {
|
|
/* single segment entry */
|
|
if (p->header.flag & BT_LEAF)
|
|
lh->next = -1;
|
|
else
|
|
ih->next = -1;
|
|
} else
|
|
/* multi-segment entry */
|
|
t->next = -1;
|
|
|
|
/* if insert into middle, shift right succeeding entries in stbl */
|
|
stbl = DT_GETSTBL(p);
|
|
nextindex = p->header.nextindex;
|
|
if (index < nextindex) {
|
|
memmove(stbl + index + 1, stbl + index, nextindex - index);
|
|
|
|
if ((p->header.flag & BT_LEAF) && data->leaf.ip) {
|
|
s64 lblock;
|
|
|
|
/*
|
|
* Need to update slot number for entries that moved
|
|
* in the stbl
|
|
*/
|
|
mp = NULL;
|
|
for (n = index + 1; n <= nextindex; n++) {
|
|
lh = (struct ldtentry *) & (p->slot[stbl[n]]);
|
|
modify_index(data->leaf.tid, data->leaf.ip,
|
|
le32_to_cpu(lh->index), bn, n,
|
|
&mp, &lblock);
|
|
}
|
|
if (mp)
|
|
release_metapage(mp);
|
|
}
|
|
}
|
|
|
|
stbl[index] = hsi;
|
|
|
|
/* advance next available entry index of stbl */
|
|
++p->header.nextindex;
|
|
}
|
|
|
|
|
|
/*
|
|
* dtMoveEntry()
|
|
*
|
|
* function: move entries from split/left page to new/right page
|
|
*
|
|
* nextindex of dst page and freelist/freecnt of both pages
|
|
* are updated.
|
|
*/
|
|
static void dtMoveEntry(dtpage_t * sp, int si, dtpage_t * dp,
|
|
struct dt_lock ** sdtlock, struct dt_lock ** ddtlock,
|
|
int do_index)
|
|
{
|
|
int ssi, next; /* src slot index */
|
|
int di; /* dst entry index */
|
|
int dsi; /* dst slot index */
|
|
s8 *sstbl, *dstbl; /* sorted entry table */
|
|
int snamlen, len;
|
|
struct ldtentry *slh, *dlh = NULL;
|
|
struct idtentry *sih, *dih = NULL;
|
|
struct dtslot *h, *s, *d;
|
|
struct dt_lock *sdtlck = *sdtlock, *ddtlck = *ddtlock;
|
|
struct lv *slv, *dlv;
|
|
int xssi, ns, nd;
|
|
int sfsi;
|
|
|
|
sstbl = (s8 *) & sp->slot[sp->header.stblindex];
|
|
dstbl = (s8 *) & dp->slot[dp->header.stblindex];
|
|
|
|
dsi = dp->header.freelist; /* first (whole page) free slot */
|
|
sfsi = sp->header.freelist;
|
|
|
|
/* linelock destination entry slot */
|
|
dlv = & ddtlck->lv[ddtlck->index];
|
|
dlv->offset = dsi;
|
|
|
|
/* linelock source entry slot */
|
|
slv = & sdtlck->lv[sdtlck->index];
|
|
slv->offset = sstbl[si];
|
|
xssi = slv->offset - 1;
|
|
|
|
/*
|
|
* move entries
|
|
*/
|
|
ns = nd = 0;
|
|
for (di = 0; si < sp->header.nextindex; si++, di++) {
|
|
ssi = sstbl[si];
|
|
dstbl[di] = dsi;
|
|
|
|
/* is next slot contiguous ? */
|
|
if (ssi != xssi + 1) {
|
|
/* close current linelock */
|
|
slv->length = ns;
|
|
sdtlck->index++;
|
|
|
|
/* open new linelock */
|
|
if (sdtlck->index < sdtlck->maxcnt)
|
|
slv++;
|
|
else {
|
|
sdtlck = (struct dt_lock *) txLinelock(sdtlck);
|
|
slv = & sdtlck->lv[0];
|
|
}
|
|
|
|
slv->offset = ssi;
|
|
ns = 0;
|
|
}
|
|
|
|
/*
|
|
* move head/only segment of an entry
|
|
*/
|
|
/* get dst slot */
|
|
h = d = &dp->slot[dsi];
|
|
|
|
/* get src slot and move */
|
|
s = &sp->slot[ssi];
|
|
if (sp->header.flag & BT_LEAF) {
|
|
/* get source entry */
|
|
slh = (struct ldtentry *) s;
|
|
dlh = (struct ldtentry *) h;
|
|
snamlen = slh->namlen;
|
|
|
|
if (do_index) {
|
|
len = min(snamlen, DTLHDRDATALEN);
|
|
dlh->index = slh->index; /* little-endian */
|
|
} else
|
|
len = min(snamlen, DTLHDRDATALEN_LEGACY);
|
|
|
|
memcpy(dlh, slh, 6 + len * 2);
|
|
|
|
next = slh->next;
|
|
|
|
/* update dst head/only segment next field */
|
|
dsi++;
|
|
dlh->next = dsi;
|
|
} else {
|
|
sih = (struct idtentry *) s;
|
|
snamlen = sih->namlen;
|
|
|
|
len = min(snamlen, DTIHDRDATALEN);
|
|
dih = (struct idtentry *) h;
|
|
memcpy(dih, sih, 10 + len * 2);
|
|
next = sih->next;
|
|
|
|
dsi++;
|
|
dih->next = dsi;
|
|
}
|
|
|
|
/* free src head/only segment */
|
|
s->next = sfsi;
|
|
s->cnt = 1;
|
|
sfsi = ssi;
|
|
|
|
ns++;
|
|
nd++;
|
|
xssi = ssi;
|
|
|
|
/*
|
|
* move additional segment(s) of the entry
|
|
*/
|
|
snamlen -= len;
|
|
while ((ssi = next) >= 0) {
|
|
/* is next slot contiguous ? */
|
|
if (ssi != xssi + 1) {
|
|
/* close current linelock */
|
|
slv->length = ns;
|
|
sdtlck->index++;
|
|
|
|
/* open new linelock */
|
|
if (sdtlck->index < sdtlck->maxcnt)
|
|
slv++;
|
|
else {
|
|
sdtlck =
|
|
(struct dt_lock *)
|
|
txLinelock(sdtlck);
|
|
slv = & sdtlck->lv[0];
|
|
}
|
|
|
|
slv->offset = ssi;
|
|
ns = 0;
|
|
}
|
|
|
|
/* get next source segment */
|
|
s = &sp->slot[ssi];
|
|
|
|
/* get next destination free slot */
|
|
d++;
|
|
|
|
len = min(snamlen, DTSLOTDATALEN);
|
|
UniStrncpy_le(d->name, s->name, len);
|
|
|
|
ns++;
|
|
nd++;
|
|
xssi = ssi;
|
|
|
|
dsi++;
|
|
d->next = dsi;
|
|
|
|
/* free source segment */
|
|
next = s->next;
|
|
s->next = sfsi;
|
|
s->cnt = 1;
|
|
sfsi = ssi;
|
|
|
|
snamlen -= len;
|
|
} /* end while */
|
|
|
|
/* terminate dst last/only segment */
|
|
if (h == d) {
|
|
/* single segment entry */
|
|
if (dp->header.flag & BT_LEAF)
|
|
dlh->next = -1;
|
|
else
|
|
dih->next = -1;
|
|
} else
|
|
/* multi-segment entry */
|
|
d->next = -1;
|
|
} /* end for */
|
|
|
|
/* close current linelock */
|
|
slv->length = ns;
|
|
sdtlck->index++;
|
|
*sdtlock = sdtlck;
|
|
|
|
dlv->length = nd;
|
|
ddtlck->index++;
|
|
*ddtlock = ddtlck;
|
|
|
|
/* update source header */
|
|
sp->header.freelist = sfsi;
|
|
sp->header.freecnt += nd;
|
|
|
|
/* update destination header */
|
|
dp->header.nextindex = di;
|
|
|
|
dp->header.freelist = dsi;
|
|
dp->header.freecnt -= nd;
|
|
}
|
|
|
|
|
|
/*
|
|
* dtDeleteEntry()
|
|
*
|
|
* function: free a (leaf/internal) entry
|
|
*
|
|
* log freelist header, stbl, and each segment slot of entry
|
|
* (even though last/only segment next field is modified,
|
|
* physical image logging requires all segment slots of
|
|
* the entry logged to avoid applying previous updates
|
|
* to the same slots)
|
|
*/
|
|
static void dtDeleteEntry(dtpage_t * p, int fi, struct dt_lock ** dtlock)
|
|
{
|
|
int fsi; /* free entry slot index */
|
|
s8 *stbl;
|
|
struct dtslot *t;
|
|
int si, freecnt;
|
|
struct dt_lock *dtlck = *dtlock;
|
|
struct lv *lv;
|
|
int xsi, n;
|
|
|
|
/* get free entry slot index */
|
|
stbl = DT_GETSTBL(p);
|
|
fsi = stbl[fi];
|
|
|
|
/* open new linelock */
|
|
if (dtlck->index >= dtlck->maxcnt)
|
|
dtlck = (struct dt_lock *) txLinelock(dtlck);
|
|
lv = & dtlck->lv[dtlck->index];
|
|
|
|
lv->offset = fsi;
|
|
|
|
/* get the head/only segment */
|
|
t = &p->slot[fsi];
|
|
if (p->header.flag & BT_LEAF)
|
|
si = ((struct ldtentry *) t)->next;
|
|
else
|
|
si = ((struct idtentry *) t)->next;
|
|
t->next = si;
|
|
t->cnt = 1;
|
|
|
|
n = freecnt = 1;
|
|
xsi = fsi;
|
|
|
|
/* find the last/only segment */
|
|
while (si >= 0) {
|
|
/* is next slot contiguous ? */
|
|
if (si != xsi + 1) {
|
|
/* close current linelock */
|
|
lv->length = n;
|
|
dtlck->index++;
|
|
|
|
/* open new linelock */
|
|
if (dtlck->index < dtlck->maxcnt)
|
|
lv++;
|
|
else {
|
|
dtlck = (struct dt_lock *) txLinelock(dtlck);
|
|
lv = & dtlck->lv[0];
|
|
}
|
|
|
|
lv->offset = si;
|
|
n = 0;
|
|
}
|
|
|
|
n++;
|
|
xsi = si;
|
|
freecnt++;
|
|
|
|
t = &p->slot[si];
|
|
t->cnt = 1;
|
|
si = t->next;
|
|
}
|
|
|
|
/* close current linelock */
|
|
lv->length = n;
|
|
dtlck->index++;
|
|
|
|
*dtlock = dtlck;
|
|
|
|
/* update freelist */
|
|
t->next = p->header.freelist;
|
|
p->header.freelist = fsi;
|
|
p->header.freecnt += freecnt;
|
|
|
|
/* if delete from middle,
|
|
* shift left the succedding entries in the stbl
|
|
*/
|
|
si = p->header.nextindex;
|
|
if (fi < si - 1)
|
|
memmove(&stbl[fi], &stbl[fi + 1], si - fi - 1);
|
|
|
|
p->header.nextindex--;
|
|
}
|
|
|
|
|
|
/*
|
|
* dtTruncateEntry()
|
|
*
|
|
* function: truncate a (leaf/internal) entry
|
|
*
|
|
* log freelist header, stbl, and each segment slot of entry
|
|
* (even though last/only segment next field is modified,
|
|
* physical image logging requires all segment slots of
|
|
* the entry logged to avoid applying previous updates
|
|
* to the same slots)
|
|
*/
|
|
static void dtTruncateEntry(dtpage_t * p, int ti, struct dt_lock ** dtlock)
|
|
{
|
|
int tsi; /* truncate entry slot index */
|
|
s8 *stbl;
|
|
struct dtslot *t;
|
|
int si, freecnt;
|
|
struct dt_lock *dtlck = *dtlock;
|
|
struct lv *lv;
|
|
int fsi, xsi, n;
|
|
|
|
/* get free entry slot index */
|
|
stbl = DT_GETSTBL(p);
|
|
tsi = stbl[ti];
|
|
|
|
/* open new linelock */
|
|
if (dtlck->index >= dtlck->maxcnt)
|
|
dtlck = (struct dt_lock *) txLinelock(dtlck);
|
|
lv = & dtlck->lv[dtlck->index];
|
|
|
|
lv->offset = tsi;
|
|
|
|
/* get the head/only segment */
|
|
t = &p->slot[tsi];
|
|
ASSERT(p->header.flag & BT_INTERNAL);
|
|
((struct idtentry *) t)->namlen = 0;
|
|
si = ((struct idtentry *) t)->next;
|
|
((struct idtentry *) t)->next = -1;
|
|
|
|
n = 1;
|
|
freecnt = 0;
|
|
fsi = si;
|
|
xsi = tsi;
|
|
|
|
/* find the last/only segment */
|
|
while (si >= 0) {
|
|
/* is next slot contiguous ? */
|
|
if (si != xsi + 1) {
|
|
/* close current linelock */
|
|
lv->length = n;
|
|
dtlck->index++;
|
|
|
|
/* open new linelock */
|
|
if (dtlck->index < dtlck->maxcnt)
|
|
lv++;
|
|
else {
|
|
dtlck = (struct dt_lock *) txLinelock(dtlck);
|
|
lv = & dtlck->lv[0];
|
|
}
|
|
|
|
lv->offset = si;
|
|
n = 0;
|
|
}
|
|
|
|
n++;
|
|
xsi = si;
|
|
freecnt++;
|
|
|
|
t = &p->slot[si];
|
|
t->cnt = 1;
|
|
si = t->next;
|
|
}
|
|
|
|
/* close current linelock */
|
|
lv->length = n;
|
|
dtlck->index++;
|
|
|
|
*dtlock = dtlck;
|
|
|
|
/* update freelist */
|
|
if (freecnt == 0)
|
|
return;
|
|
t->next = p->header.freelist;
|
|
p->header.freelist = fsi;
|
|
p->header.freecnt += freecnt;
|
|
}
|
|
|
|
|
|
/*
|
|
* dtLinelockFreelist()
|
|
*/
|
|
static void dtLinelockFreelist(dtpage_t * p, /* directory page */
|
|
int m, /* max slot index */
|
|
struct dt_lock ** dtlock)
|
|
{
|
|
int fsi; /* free entry slot index */
|
|
struct dtslot *t;
|
|
int si;
|
|
struct dt_lock *dtlck = *dtlock;
|
|
struct lv *lv;
|
|
int xsi, n;
|
|
|
|
/* get free entry slot index */
|
|
fsi = p->header.freelist;
|
|
|
|
/* open new linelock */
|
|
if (dtlck->index >= dtlck->maxcnt)
|
|
dtlck = (struct dt_lock *) txLinelock(dtlck);
|
|
lv = & dtlck->lv[dtlck->index];
|
|
|
|
lv->offset = fsi;
|
|
|
|
n = 1;
|
|
xsi = fsi;
|
|
|
|
t = &p->slot[fsi];
|
|
si = t->next;
|
|
|
|
/* find the last/only segment */
|
|
while (si < m && si >= 0) {
|
|
/* is next slot contiguous ? */
|
|
if (si != xsi + 1) {
|
|
/* close current linelock */
|
|
lv->length = n;
|
|
dtlck->index++;
|
|
|
|
/* open new linelock */
|
|
if (dtlck->index < dtlck->maxcnt)
|
|
lv++;
|
|
else {
|
|
dtlck = (struct dt_lock *) txLinelock(dtlck);
|
|
lv = & dtlck->lv[0];
|
|
}
|
|
|
|
lv->offset = si;
|
|
n = 0;
|
|
}
|
|
|
|
n++;
|
|
xsi = si;
|
|
|
|
t = &p->slot[si];
|
|
si = t->next;
|
|
}
|
|
|
|
/* close current linelock */
|
|
lv->length = n;
|
|
dtlck->index++;
|
|
|
|
*dtlock = dtlck;
|
|
}
|
|
|
|
|
|
/*
|
|
* NAME: dtModify
|
|
*
|
|
* FUNCTION: Modify the inode number part of a directory entry
|
|
*
|
|
* PARAMETERS:
|
|
* tid - Transaction id
|
|
* ip - Inode of parent directory
|
|
* key - Name of entry to be modified
|
|
* orig_ino - Original inode number expected in entry
|
|
* new_ino - New inode number to put into entry
|
|
* flag - JFS_RENAME
|
|
*
|
|
* RETURNS:
|
|
* -ESTALE - If entry found does not match orig_ino passed in
|
|
* -ENOENT - If no entry can be found to match key
|
|
* 0 - If successfully modified entry
|
|
*/
|
|
int dtModify(tid_t tid, struct inode *ip,
|
|
struct component_name * key, ino_t * orig_ino, ino_t new_ino, int flag)
|
|
{
|
|
int rc;
|
|
s64 bn;
|
|
struct metapage *mp;
|
|
dtpage_t *p;
|
|
int index;
|
|
struct btstack btstack;
|
|
struct tlock *tlck;
|
|
struct dt_lock *dtlck;
|
|
struct lv *lv;
|
|
s8 *stbl;
|
|
int entry_si; /* entry slot index */
|
|
struct ldtentry *entry;
|
|
|
|
/*
|
|
* search for the entry to modify:
|
|
*
|
|
* dtSearch() returns (leaf page pinned, index at which to modify).
|
|
*/
|
|
if ((rc = dtSearch(ip, key, orig_ino, &btstack, flag)))
|
|
return rc;
|
|
|
|
/* retrieve search result */
|
|
DT_GETSEARCH(ip, btstack.top, bn, mp, p, index);
|
|
|
|
BT_MARK_DIRTY(mp, ip);
|
|
/*
|
|
* acquire a transaction lock on the leaf page of named entry
|
|
*/
|
|
tlck = txLock(tid, ip, mp, tlckDTREE | tlckENTRY);
|
|
dtlck = (struct dt_lock *) & tlck->lock;
|
|
|
|
/* get slot index of the entry */
|
|
stbl = DT_GETSTBL(p);
|
|
entry_si = stbl[index];
|
|
|
|
/* linelock entry */
|
|
ASSERT(dtlck->index == 0);
|
|
lv = & dtlck->lv[0];
|
|
lv->offset = entry_si;
|
|
lv->length = 1;
|
|
dtlck->index++;
|
|
|
|
/* get the head/only segment */
|
|
entry = (struct ldtentry *) & p->slot[entry_si];
|
|
|
|
/* substitute the inode number of the entry */
|
|
entry->inumber = cpu_to_le32(new_ino);
|
|
|
|
/* unpin the leaf page */
|
|
DT_PUTPAGE(mp);
|
|
|
|
return 0;
|
|
}
|