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Linux/fs/jfs/jfs_txnmgr.h

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  1 /*
  2  *   Copyright (C) International Business Machines Corp., 2000-2004
  3  *
  4  *   This program is free software;  you can redistribute it and/or modify
  5  *   it under the terms of the GNU General Public License as published by
  6  *   the Free Software Foundation; either version 2 of the License, or
  7  *   (at your option) any later version.
  8  *
  9  *   This program is distributed in the hope that it will be useful,
 10  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 12  *   the GNU General Public License for more details.
 13  *
 14  *   You should have received a copy of the GNU General Public License
 15  *   along with this program;  if not, write to the Free Software
 16  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 17  */
 18 #ifndef _H_JFS_TXNMGR
 19 #define _H_JFS_TXNMGR
 20 
 21 #include "jfs_logmgr.h"
 22 
 23 /*
 24  * Hide implementation of TxBlock and TxLock
 25  */
 26 #define tid_to_tblock(tid) (&TxBlock[tid])
 27 
 28 #define lid_to_tlock(lid) (&TxLock[lid])
 29 
 30 /*
 31  *      transaction block
 32  */
 33 struct tblock {
 34         /*
 35          * tblock and jbuf_t common area: struct logsyncblk
 36          *
 37          * the following 5 fields are the same as struct logsyncblk
 38          * which is common to tblock and jbuf to form logsynclist
 39          */
 40         u16 xflag;              /* tx commit type */
 41         u16 flag;               /* tx commit state */
 42         lid_t dummy;            /* Must keep structures common */
 43         s32 lsn;                /* recovery lsn */
 44         struct list_head synclist;      /* logsynclist link */
 45 
 46         /* lock management */
 47         struct super_block *sb; /* super block */
 48         lid_t next;             /* index of first tlock of tid */
 49         lid_t last;             /* index of last tlock of tid */
 50         wait_queue_head_t waitor;       /* tids waiting on this tid */
 51 
 52         /* log management */
 53         u32 logtid;             /* log transaction id */
 54 
 55         /* commit management */
 56         struct list_head cqueue;        /* commit queue list */
 57         s32 clsn;               /* commit lsn */
 58         struct lbuf *bp;
 59         s32 pn;                 /* commit record log page number */
 60         s32 eor;                /* commit record eor */
 61         wait_queue_head_t gcwait;       /* group commit event list:
 62                                          * ready transactions wait on this
 63                                          * event for group commit completion.
 64                                          */
 65         union {
 66                 struct inode *ip; /* inode being deleted */
 67                 pxd_t ixpxd;    /* pxd of inode extent for created inode */
 68         } u;
 69         u32 ino;                /* inode number being created */
 70 };
 71 
 72 extern struct tblock *TxBlock;  /* transaction block table */
 73 
 74 /* commit flags: tblk->xflag */
 75 #define COMMIT_SYNC     0x0001  /* synchronous commit */
 76 #define COMMIT_FORCE    0x0002  /* force pageout at end of commit */
 77 #define COMMIT_FLUSH    0x0004  /* init flush at end of commit */
 78 #define COMMIT_MAP      0x00f0
 79 #define COMMIT_PMAP     0x0010  /* update pmap */
 80 #define COMMIT_WMAP     0x0020  /* update wmap */
 81 #define COMMIT_PWMAP    0x0040  /* update pwmap */
 82 #define COMMIT_FREE     0x0f00
 83 #define COMMIT_DELETE   0x0100  /* inode delete */
 84 #define COMMIT_TRUNCATE 0x0200  /* file truncation */
 85 #define COMMIT_CREATE   0x0400  /* inode create */
 86 #define COMMIT_LAZY     0x0800  /* lazy commit */
 87 #define COMMIT_PAGE     0x1000  /* Identifies element as metapage */
 88 #define COMMIT_INODE    0x2000  /* Identifies element as inode */
 89 
 90 /* group commit flags tblk->flag: see jfs_logmgr.h */
 91 
 92 /*
 93  *      transaction lock
 94  */
 95 struct tlock {
 96         lid_t next;             /* 2: index next lockword on tid locklist
 97                                  *          next lockword on freelist
 98                                  */
 99         tid_t tid;              /* 2: transaction id holding lock */
100 
101         u16 flag;               /* 2: lock control */
102         u16 type;               /* 2: log type */
103 
104         struct metapage *mp;    /* 4/8: object page buffer locked */
105         struct inode *ip;       /* 4/8: object */
106         /* (16) */
107 
108         s16 lock[24];           /* 48: overlay area */
109 };                              /* (64) */
110 
111 extern struct tlock *TxLock;    /* transaction lock table */
112 
113 /*
114  * tlock flag
115  */
116 /* txLock state */
117 #define tlckPAGELOCK            0x8000
118 #define tlckINODELOCK           0x4000
119 #define tlckLINELOCK            0x2000
120 #define tlckINLINELOCK          0x1000
121 /* lmLog state */
122 #define tlckLOG                 0x0800
123 /* updateMap state */
124 #define tlckUPDATEMAP           0x0080
125 #define tlckDIRECTORY           0x0040
126 /* freeLock state */
127 #define tlckFREELOCK            0x0008
128 #define tlckWRITEPAGE           0x0004
129 #define tlckFREEPAGE            0x0002
130 
131 /*
132  * tlock type
133  */
134 #define tlckTYPE                0xfe00
135 #define tlckINODE               0x8000
136 #define tlckXTREE               0x4000
137 #define tlckDTREE               0x2000
138 #define tlckMAP                 0x1000
139 #define tlckEA                  0x0800
140 #define tlckACL                 0x0400
141 #define tlckDATA                0x0200
142 #define tlckBTROOT              0x0100
143 
144 #define tlckOPERATION           0x00ff
145 #define tlckGROW                0x0001  /* file grow */
146 #define tlckREMOVE              0x0002  /* file delete */
147 #define tlckTRUNCATE            0x0004  /* file truncate */
148 #define tlckRELOCATE            0x0008  /* file/directory relocate */
149 #define tlckENTRY               0x0001  /* directory insert/delete */
150 #define tlckEXTEND              0x0002  /* directory extend in-line */
151 #define tlckSPLIT               0x0010  /* splited page */
152 #define tlckNEW                 0x0020  /* new page from split */
153 #define tlckFREE                0x0040  /* free page */
154 #define tlckRELINK              0x0080  /* update sibling pointer */
155 
156 /*
157  *      linelock for lmLog()
158  *
159  * note: linelock and its variations are overlaid
160  * at tlock.lock: watch for alignment;
161  */
162 struct lv {
163         u8 offset;              /* 1: */
164         u8 length;              /* 1: */
165 };                              /* (2) */
166 
167 #define TLOCKSHORT      20
168 #define TLOCKLONG       28
169 
170 struct linelock {
171         lid_t next;             /* 2: next linelock */
172 
173         s8 maxcnt;              /* 1: */
174         s8 index;               /* 1: */
175 
176         u16 flag;               /* 2: */
177         u8 type;                /* 1: */
178         u8 l2linesize;          /* 1: log2 of linesize */
179         /* (8) */
180 
181         struct lv lv[20];       /* 40: */
182 };                              /* (48) */
183 
184 #define dt_lock linelock
185 
186 struct xtlock {
187         lid_t next;             /* 2: */
188 
189         s8 maxcnt;              /* 1: */
190         s8 index;               /* 1: */
191 
192         u16 flag;               /* 2: */
193         u8 type;                /* 1: */
194         u8 l2linesize;          /* 1: log2 of linesize */
195                                 /* (8) */
196 
197         struct lv header;       /* 2: */
198         struct lv lwm;          /* 2: low water mark */
199         struct lv hwm;          /* 2: high water mark */
200         struct lv twm;          /* 2: */
201                                 /* (16) */
202 
203         s32 pxdlock[8];         /* 32: */
204 };                              /* (48) */
205 
206 
207 /*
208  *      maplock for txUpdateMap()
209  *
210  * note: maplock and its variations are overlaid
211  * at tlock.lock/linelock: watch for alignment;
212  * N.B. next field may be set by linelock, and should not
213  * be modified by maplock;
214  * N.B. index of the first pxdlock specifies index of next
215  * free maplock (i.e., number of maplock) in the tlock;
216  */
217 struct maplock {
218         lid_t next;             /* 2: */
219 
220         u8 maxcnt;              /* 2: */
221         u8 index;               /* 2: next free maplock index */
222 
223         u16 flag;               /* 2: */
224         u8 type;                /* 1: */
225         u8 count;               /* 1: number of pxd/xad */
226                                 /* (8) */
227 
228         pxd_t pxd;              /* 8: */
229 };                              /* (16): */
230 
231 /* maplock flag */
232 #define mlckALLOC               0x00f0
233 #define mlckALLOCXADLIST        0x0080
234 #define mlckALLOCPXDLIST        0x0040
235 #define mlckALLOCXAD            0x0020
236 #define mlckALLOCPXD            0x0010
237 #define mlckFREE                0x000f
238 #define mlckFREEXADLIST         0x0008
239 #define mlckFREEPXDLIST         0x0004
240 #define mlckFREEXAD             0x0002
241 #define mlckFREEPXD             0x0001
242 
243 #define pxd_lock        maplock
244 
245 struct xdlistlock {
246         lid_t next;             /* 2: */
247 
248         u8 maxcnt;              /* 2: */
249         u8 index;               /* 2: */
250 
251         u16 flag;               /* 2: */
252         u8 type;                /* 1: */
253         u8 count;               /* 1: number of pxd/xad */
254                                 /* (8) */
255 
256         /*
257          * We need xdlist to be 64 bits (8 bytes), regardless of
258          * whether void * is 32 or 64 bits
259          */
260         union {
261                 void *_xdlist;  /* pxd/xad list */
262                 s64 pad;        /* 8: Force 64-bit xdlist size */
263         } union64;
264 };                              /* (16): */
265 
266 #define xdlist union64._xdlist
267 
268 /*
269  *      commit
270  *
271  * parameter to the commit manager routines
272  */
273 struct commit {
274         tid_t tid;              /* tid = index of tblock */
275         int flag;               /* flags */
276         struct jfs_log *log;    /* log */
277         struct super_block *sb; /* superblock */
278 
279         int nip;                /* number of entries in iplist */
280         struct inode **iplist;  /* list of pointers to inodes */
281 
282         /* log record descriptor on 64-bit boundary */
283         struct lrd lrd;         /* : log record descriptor */
284 };
285 
286 /*
287  * external declarations
288  */
289 extern int jfs_tlocks_low;
290 
291 extern int txInit(void);
292 extern void txExit(void);
293 extern struct tlock *txLock(tid_t, struct inode *, struct metapage *, int);
294 extern struct tlock *txMaplock(tid_t, struct inode *, int);
295 extern int txCommit(tid_t, int, struct inode **, int);
296 extern tid_t txBegin(struct super_block *, int);
297 extern void txBeginAnon(struct super_block *);
298 extern void txEnd(tid_t);
299 extern void txAbort(tid_t, int);
300 extern struct linelock *txLinelock(struct linelock *);
301 extern void txFreeMap(struct inode *, struct maplock *, struct tblock *, int);
302 extern void txEA(tid_t, struct inode *, dxd_t *, dxd_t *);
303 extern void txFreelock(struct inode *);
304 extern int lmLog(struct jfs_log *, struct tblock *, struct lrd *,
305                  struct tlock *);
306 extern void txQuiesce(struct super_block *);
307 extern void txResume(struct super_block *);
308 extern void txLazyUnlock(struct tblock *);
309 extern int jfs_lazycommit(void *);
310 extern int jfs_sync(void *);
311 #endif                          /* _H_JFS_TXNMGR */
312 

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