515 lines
15 KiB
C
515 lines
15 KiB
C
/*
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* Copyright (C) International Business Machines Corp., 2000-2004
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* Portions Copyright (C) Christoph Hellwig, 2001-2002
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _H_JFS_LOGMGR
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#define _H_JFS_LOGMGR
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#include "jfs_filsys.h"
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#include "jfs_lock.h"
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/*
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* log manager configuration parameters
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*/
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/* log page size */
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#define LOGPSIZE 4096
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#define L2LOGPSIZE 12
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#define LOGPAGES 16 /* Log pages per mounted file system */
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/*
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* log logical volume
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*
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* a log is used to make the commit operation on journalled
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* files within the same logical volume group atomic.
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* a log is implemented with a logical volume.
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* there is one log per logical volume group.
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*
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* block 0 of the log logical volume is not used (ipl etc).
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* block 1 contains a log "superblock" and is used by logFormat(),
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* lmLogInit(), lmLogShutdown(), and logRedo() to record status
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* of the log but is not otherwise used during normal processing.
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* blocks 2 - (N-1) are used to contain log records.
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*
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* when a volume group is varied-on-line, logRedo() must have
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* been executed before the file systems (logical volumes) in
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* the volume group can be mounted.
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*/
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/*
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* log superblock (block 1 of logical volume)
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*/
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#define LOGSUPER_B 1
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#define LOGSTART_B 2
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#define LOGMAGIC 0x87654321
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#define LOGVERSION 1
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#define MAX_ACTIVE 128 /* Max active file systems sharing log */
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struct logsuper {
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__le32 magic; /* 4: log lv identifier */
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__le32 version; /* 4: version number */
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__le32 serial; /* 4: log open/mount counter */
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__le32 size; /* 4: size in number of LOGPSIZE blocks */
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__le32 bsize; /* 4: logical block size in byte */
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__le32 l2bsize; /* 4: log2 of bsize */
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__le32 flag; /* 4: option */
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__le32 state; /* 4: state - see below */
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__le32 end; /* 4: addr of last log record set by logredo */
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char uuid[16]; /* 16: 128-bit journal uuid */
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char label[16]; /* 16: journal label */
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struct {
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char uuid[16];
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} active[MAX_ACTIVE]; /* 2048: active file systems list */
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};
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#define NULL_UUID "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
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/* log flag: commit option (see jfs_filsys.h) */
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/* log state */
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#define LOGMOUNT 0 /* log mounted by lmLogInit() */
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#define LOGREDONE 1 /* log shutdown by lmLogShutdown().
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* log redo completed by logredo().
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*/
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#define LOGWRAP 2 /* log wrapped */
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#define LOGREADERR 3 /* log read error detected in logredo() */
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/*
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* log logical page
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*
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* (this comment should be rewritten !)
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* the header and trailer structures (h,t) will normally have
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* the same page and eor value.
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* An exception to this occurs when a complete page write is not
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* accomplished on a power failure. Since the hardware may "split write"
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* sectors in the page, any out of order sequence may occur during powerfail
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* and needs to be recognized during log replay. The xor value is
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* an "exclusive or" of all log words in the page up to eor. This
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* 32 bit eor is stored with the top 16 bits in the header and the
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* bottom 16 bits in the trailer. logredo can easily recognize pages
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* that were not completed by reconstructing this eor and checking
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* the log page.
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*
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* Previous versions of the operating system did not allow split
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* writes and detected partially written records in logredo by
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* ordering the updates to the header, trailer, and the move of data
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* into the logdata area. The order: (1) data is moved (2) header
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* is updated (3) trailer is updated. In logredo, when the header
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* differed from the trailer, the header and trailer were reconciled
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* as follows: if h.page != t.page they were set to the smaller of
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* the two and h.eor and t.eor set to 8 (i.e. empty page). if (only)
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* h.eor != t.eor they were set to the smaller of their two values.
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*/
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struct logpage {
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struct { /* header */
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__le32 page; /* 4: log sequence page number */
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__le16 rsrvd; /* 2: */
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__le16 eor; /* 2: end-of-log offset of lasrt record write */
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} h;
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__le32 data[LOGPSIZE / 4 - 4]; /* log record area */
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struct { /* trailer */
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__le32 page; /* 4: normally the same as h.page */
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__le16 rsrvd; /* 2: */
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__le16 eor; /* 2: normally the same as h.eor */
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} t;
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};
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#define LOGPHDRSIZE 8 /* log page header size */
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#define LOGPTLRSIZE 8 /* log page trailer size */
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/*
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* log record
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*
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* (this comment should be rewritten !)
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* jfs uses only "after" log records (only a single writer is allowed
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* in a page, pages are written to temporary paging space if
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* if they must be written to disk before commit, and i/o is
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* scheduled for modified pages to their home location after
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* the log records containing the after values and the commit
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* record is written to the log on disk, undo discards the copy
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* in main-memory.)
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*
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* a log record consists of a data area of variable length followed by
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* a descriptor of fixed size LOGRDSIZE bytes.
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* the data area is rounded up to an integral number of 4-bytes and
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* must be no longer than LOGPSIZE.
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* the descriptor is of size of multiple of 4-bytes and aligned on a
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* 4-byte boundary.
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* records are packed one after the other in the data area of log pages.
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* (sometimes a DUMMY record is inserted so that at least one record ends
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* on every page or the longest record is placed on at most two pages).
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* the field eor in page header/trailer points to the byte following
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* the last record on a page.
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*/
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/* log record types */
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#define LOG_COMMIT 0x8000
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#define LOG_SYNCPT 0x4000
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#define LOG_MOUNT 0x2000
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#define LOG_REDOPAGE 0x0800
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#define LOG_NOREDOPAGE 0x0080
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#define LOG_NOREDOINOEXT 0x0040
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#define LOG_UPDATEMAP 0x0008
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#define LOG_NOREDOFILE 0x0001
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/* REDOPAGE/NOREDOPAGE log record data type */
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#define LOG_INODE 0x0001
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#define LOG_XTREE 0x0002
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#define LOG_DTREE 0x0004
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#define LOG_BTROOT 0x0010
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#define LOG_EA 0x0020
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#define LOG_ACL 0x0040
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#define LOG_DATA 0x0080
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#define LOG_NEW 0x0100
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#define LOG_EXTEND 0x0200
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#define LOG_RELOCATE 0x0400
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#define LOG_DIR_XTREE 0x0800 /* Xtree is in directory inode */
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/* UPDATEMAP log record descriptor type */
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#define LOG_ALLOCXADLIST 0x0080
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#define LOG_ALLOCPXDLIST 0x0040
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#define LOG_ALLOCXAD 0x0020
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#define LOG_ALLOCPXD 0x0010
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#define LOG_FREEXADLIST 0x0008
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#define LOG_FREEPXDLIST 0x0004
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#define LOG_FREEXAD 0x0002
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#define LOG_FREEPXD 0x0001
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struct lrd {
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/*
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* type independent area
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*/
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__le32 logtid; /* 4: log transaction identifier */
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__le32 backchain; /* 4: ptr to prev record of same transaction */
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__le16 type; /* 2: record type */
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__le16 length; /* 2: length of data in record (in byte) */
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__le32 aggregate; /* 4: file system lv/aggregate */
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/* (16) */
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/*
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* type dependent area (20)
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*/
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union {
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/*
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* COMMIT: commit
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*
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* transaction commit: no type-dependent information;
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*/
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/*
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* REDOPAGE: after-image
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*
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* apply after-image;
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*
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* N.B. REDOPAGE, NOREDOPAGE, and UPDATEMAP must be same format;
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*/
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struct {
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__le32 fileset; /* 4: fileset number */
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__le32 inode; /* 4: inode number */
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__le16 type; /* 2: REDOPAGE record type */
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__le16 l2linesize; /* 2: log2 of line size */
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pxd_t pxd; /* 8: on-disk page pxd */
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} redopage; /* (20) */
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/*
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* NOREDOPAGE: the page is freed
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*
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* do not apply after-image records which precede this record
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* in the log with the same page block number to this page.
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*
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* N.B. REDOPAGE, NOREDOPAGE, and UPDATEMAP must be same format;
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*/
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struct {
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__le32 fileset; /* 4: fileset number */
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__le32 inode; /* 4: inode number */
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__le16 type; /* 2: NOREDOPAGE record type */
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__le16 rsrvd; /* 2: reserved */
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pxd_t pxd; /* 8: on-disk page pxd */
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} noredopage; /* (20) */
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/*
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* UPDATEMAP: update block allocation map
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*
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* either in-line PXD,
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* or out-of-line XADLIST;
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*
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* N.B. REDOPAGE, NOREDOPAGE, and UPDATEMAP must be same format;
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*/
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struct {
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__le32 fileset; /* 4: fileset number */
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__le32 inode; /* 4: inode number */
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__le16 type; /* 2: UPDATEMAP record type */
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__le16 nxd; /* 2: number of extents */
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pxd_t pxd; /* 8: pxd */
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} updatemap; /* (20) */
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/*
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* NOREDOINOEXT: the inode extent is freed
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*
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* do not apply after-image records which precede this
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* record in the log with the any of the 4 page block
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* numbers in this inode extent.
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*
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* NOTE: The fileset and pxd fields MUST remain in
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* the same fields in the REDOPAGE record format.
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*
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*/
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struct {
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__le32 fileset; /* 4: fileset number */
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__le32 iagnum; /* 4: IAG number */
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__le32 inoext_idx; /* 4: inode extent index */
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pxd_t pxd; /* 8: on-disk page pxd */
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} noredoinoext; /* (20) */
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/*
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* SYNCPT: log sync point
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*
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* replay log upto syncpt address specified;
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*/
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struct {
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__le32 sync; /* 4: syncpt address (0 = here) */
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} syncpt;
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/*
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* MOUNT: file system mount
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*
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* file system mount: no type-dependent information;
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*/
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/*
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* ? FREEXTENT: free specified extent(s)
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*
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* free specified extent(s) from block allocation map
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* N.B.: nextents should be length of data/sizeof(xad_t)
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*/
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struct {
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__le32 type; /* 4: FREEXTENT record type */
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__le32 nextent; /* 4: number of extents */
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/* data: PXD or XAD list */
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} freextent;
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/*
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* ? NOREDOFILE: this file is freed
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*
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* do not apply records which precede this record in the log
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* with the same inode number.
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*
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* NOREDILE must be the first to be written at commit
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* (last to be read in logredo()) - it prevents
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* replay of preceding updates of all preceding generations
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* of the inumber esp. the on-disk inode itself,
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* but does NOT prevent
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* replay of the
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*/
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struct {
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__le32 fileset; /* 4: fileset number */
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__le32 inode; /* 4: inode number */
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} noredofile;
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/*
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* ? NEWPAGE:
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*
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* metadata type dependent
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*/
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struct {
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__le32 fileset; /* 4: fileset number */
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__le32 inode; /* 4: inode number */
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__le32 type; /* 4: NEWPAGE record type */
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pxd_t pxd; /* 8: on-disk page pxd */
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} newpage;
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/*
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* ? DUMMY: filler
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*
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* no type-dependent information
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*/
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} log;
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}; /* (36) */
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#define LOGRDSIZE (sizeof(struct lrd))
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/*
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* line vector descriptor
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*/
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struct lvd {
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__le16 offset;
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__le16 length;
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};
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/*
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* log logical volume
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*/
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struct jfs_log {
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struct list_head sb_list;/* This is used to sync metadata
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* before writing syncpt.
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*/
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struct list_head journal_list; /* Global list */
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struct block_device *bdev; /* 4: log lv pointer */
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int serial; /* 4: log mount serial number */
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s64 base; /* @8: log extent address (inline log ) */
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int size; /* 4: log size in log page (in page) */
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int l2bsize; /* 4: log2 of bsize */
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long flag; /* 4: flag */
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struct lbuf *lbuf_free; /* 4: free lbufs */
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wait_queue_head_t free_wait; /* 4: */
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/* log write */
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int logtid; /* 4: log tid */
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int page; /* 4: page number of eol page */
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int eor; /* 4: eor of last record in eol page */
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struct lbuf *bp; /* 4: current log page buffer */
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struct semaphore loglock; /* 4: log write serialization lock */
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/* syncpt */
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int nextsync; /* 4: bytes to write before next syncpt */
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int active; /* 4: */
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wait_queue_head_t syncwait; /* 4: */
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/* commit */
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uint cflag; /* 4: */
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struct list_head cqueue; /* FIFO commit queue */
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struct tblock *flush_tblk; /* tblk we're waiting on for flush */
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int gcrtc; /* 4: GC_READY transaction count */
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struct tblock *gclrt; /* 4: latest GC_READY transaction */
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spinlock_t gclock; /* 4: group commit lock */
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int logsize; /* 4: log data area size in byte */
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int lsn; /* 4: end-of-log */
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int clsn; /* 4: clsn */
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int syncpt; /* 4: addr of last syncpt record */
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int sync; /* 4: addr from last logsync() */
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struct list_head synclist; /* 8: logsynclist anchor */
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spinlock_t synclock; /* 4: synclist lock */
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struct lbuf *wqueue; /* 4: log pageout queue */
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int count; /* 4: count */
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char uuid[16]; /* 16: 128-bit uuid of log device */
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int no_integrity; /* 3: flag to disable journaling to disk */
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};
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/*
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* Log flag
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*/
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#define log_INLINELOG 1
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#define log_SYNCBARRIER 2
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#define log_QUIESCE 3
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#define log_FLUSH 4
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/*
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* group commit flag
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*/
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/* jfs_log */
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#define logGC_PAGEOUT 0x00000001
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/* tblock/lbuf */
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#define tblkGC_QUEUE 0x0001
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#define tblkGC_READY 0x0002
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#define tblkGC_COMMIT 0x0004
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#define tblkGC_COMMITTED 0x0008
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#define tblkGC_EOP 0x0010
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#define tblkGC_FREE 0x0020
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#define tblkGC_LEADER 0x0040
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#define tblkGC_ERROR 0x0080
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#define tblkGC_LAZY 0x0100 // D230860
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#define tblkGC_UNLOCKED 0x0200 // D230860
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/*
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* log cache buffer header
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*/
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struct lbuf {
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struct jfs_log *l_log; /* 4: log associated with buffer */
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/*
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* data buffer base area
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*/
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uint l_flag; /* 4: pageout control flags */
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struct lbuf *l_wqnext; /* 4: write queue link */
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struct lbuf *l_freelist; /* 4: freelistlink */
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int l_pn; /* 4: log page number */
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int l_eor; /* 4: log record eor */
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int l_ceor; /* 4: committed log record eor */
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s64 l_blkno; /* 8: log page block number */
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caddr_t l_ldata; /* 4: data page */
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struct page *l_page; /* The page itself */
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uint l_offset; /* Offset of l_ldata within the page */
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wait_queue_head_t l_ioevent; /* 4: i/o done event */
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};
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/* Reuse l_freelist for redrive list */
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#define l_redrive_next l_freelist
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/*
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* logsynclist block
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*
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* common logsyncblk prefix for jbuf_t and tblock
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*/
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struct logsyncblk {
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u16 xflag; /* flags */
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u16 flag; /* only meaninful in tblock */
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lid_t lid; /* lock id */
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s32 lsn; /* log sequence number */
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struct list_head synclist; /* log sync list link */
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};
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/*
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* logsynclist serialization (per log)
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*/
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#define LOGSYNC_LOCK_INIT(log) spin_lock_init(&(log)->synclock)
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#define LOGSYNC_LOCK(log, flags) spin_lock_irqsave(&(log)->synclock, flags)
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#define LOGSYNC_UNLOCK(log, flags) \
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spin_unlock_irqrestore(&(log)->synclock, flags)
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/* compute the difference in bytes of lsn from sync point */
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#define logdiff(diff, lsn, log)\
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{\
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diff = (lsn) - (log)->syncpt;\
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if (diff < 0)\
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diff += (log)->logsize;\
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}
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extern int lmLogOpen(struct super_block *sb);
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extern int lmLogClose(struct super_block *sb);
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extern int lmLogShutdown(struct jfs_log * log);
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extern int lmLogInit(struct jfs_log * log);
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extern int lmLogFormat(struct jfs_log *log, s64 logAddress, int logSize);
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extern int lmGroupCommit(struct jfs_log *, struct tblock *);
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extern int jfsIOWait(void *);
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extern void jfs_flush_journal(struct jfs_log * log, int wait);
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extern void jfs_syncpt(struct jfs_log *log);
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#endif /* _H_JFS_LOGMGR */
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