955e47ad28
space for the unmount record - which becomes a problem in the freeze/thaw scenario. SGI-PV: 942533 SGI-Modid: xfs-linux-melb:xfs-kern:26815a Signed-off-by: Tim Shimmin <tes@sgi.com>
513 lines
18 KiB
C
513 lines
18 KiB
C
/*
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* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would 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 the
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* 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 the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_LOG_PRIV_H__
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#define __XFS_LOG_PRIV_H__
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struct xfs_buf;
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struct ktrace;
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struct log;
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struct xlog_ticket;
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struct xfs_buf_cancel;
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struct xfs_mount;
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/*
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* Macros, structures, prototypes for internal log manager use.
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*/
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#define XLOG_MIN_ICLOGS 2
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#define XLOG_MED_ICLOGS 4
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#define XLOG_MAX_ICLOGS 8
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#define XLOG_HEADER_MAGIC_NUM 0xFEEDbabe /* Invalid cycle number */
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#define XLOG_VERSION_1 1
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#define XLOG_VERSION_2 2 /* Large IClogs, Log sunit */
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#define XLOG_VERSION_OKBITS (XLOG_VERSION_1 | XLOG_VERSION_2)
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#define XLOG_RECORD_BSIZE (16*1024) /* eventually 32k */
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#define XLOG_BIG_RECORD_BSIZE (32*1024) /* 32k buffers */
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#define XLOG_MAX_RECORD_BSIZE (256*1024)
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#define XLOG_HEADER_CYCLE_SIZE (32*1024) /* cycle data in header */
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#define XLOG_RECORD_BSHIFT 14 /* 16384 == 1 << 14 */
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#define XLOG_BIG_RECORD_BSHIFT 15 /* 32k == 1 << 15 */
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#define XLOG_MAX_RECORD_BSHIFT 18 /* 256k == 1 << 18 */
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#define XLOG_BTOLSUNIT(log, b) (((b)+(log)->l_mp->m_sb.sb_logsunit-1) / \
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(log)->l_mp->m_sb.sb_logsunit)
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#define XLOG_LSUNITTOB(log, su) ((su) * (log)->l_mp->m_sb.sb_logsunit)
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#define XLOG_HEADER_SIZE 512
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#define XLOG_REC_SHIFT(log) \
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BTOBB(1 << (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) ? \
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XLOG_MAX_RECORD_BSHIFT : XLOG_BIG_RECORD_BSHIFT))
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#define XLOG_TOTAL_REC_SHIFT(log) \
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BTOBB(XLOG_MAX_ICLOGS << (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) ? \
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XLOG_MAX_RECORD_BSHIFT : XLOG_BIG_RECORD_BSHIFT))
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/*
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* set lsns
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*/
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#define ASSIGN_ANY_LSN_HOST(lsn,cycle,block) \
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{ \
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(lsn) = ((xfs_lsn_t)(cycle)<<32)|(block); \
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}
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#define ASSIGN_ANY_LSN_DISK(lsn,cycle,block) \
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{ \
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INT_SET(((uint *)&(lsn))[0], ARCH_CONVERT, (cycle)); \
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INT_SET(((uint *)&(lsn))[1], ARCH_CONVERT, (block)); \
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}
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#define ASSIGN_LSN(lsn,log) \
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ASSIGN_ANY_LSN_DISK(lsn,(log)->l_curr_cycle,(log)->l_curr_block);
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#define XLOG_SET(f,b) (((f) & (b)) == (b))
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#define GET_CYCLE(ptr, arch) \
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(INT_GET(*(uint *)(ptr), arch) == XLOG_HEADER_MAGIC_NUM ? \
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INT_GET(*((uint *)(ptr)+1), arch) : \
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INT_GET(*(uint *)(ptr), arch) \
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)
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#define BLK_AVG(blk1, blk2) ((blk1+blk2) >> 1)
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#ifdef __KERNEL__
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/*
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* get client id from packed copy.
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*
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* this hack is here because the xlog_pack code copies four bytes
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* of xlog_op_header containing the fields oh_clientid, oh_flags
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* and oh_res2 into the packed copy.
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*
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* later on this four byte chunk is treated as an int and the
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* client id is pulled out.
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*
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* this has endian issues, of course.
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*/
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#ifndef XFS_NATIVE_HOST
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#define GET_CLIENT_ID(i,arch) \
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((i) & 0xff)
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#else
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#define GET_CLIENT_ID(i,arch) \
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((i) >> 24)
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#endif
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#define GRANT_LOCK(log) mutex_spinlock(&(log)->l_grant_lock)
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#define GRANT_UNLOCK(log, s) mutex_spinunlock(&(log)->l_grant_lock, s)
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#define LOG_LOCK(log) mutex_spinlock(&(log)->l_icloglock)
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#define LOG_UNLOCK(log, s) mutex_spinunlock(&(log)->l_icloglock, s)
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#define xlog_panic(args...) cmn_err(CE_PANIC, ## args)
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#define xlog_exit(args...) cmn_err(CE_PANIC, ## args)
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#define xlog_warn(args...) cmn_err(CE_WARN, ## args)
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/*
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* In core log state
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*/
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#define XLOG_STATE_ACTIVE 0x0001 /* Current IC log being written to */
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#define XLOG_STATE_WANT_SYNC 0x0002 /* Want to sync this iclog; no more writes */
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#define XLOG_STATE_SYNCING 0x0004 /* This IC log is syncing */
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#define XLOG_STATE_DONE_SYNC 0x0008 /* Done syncing to disk */
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#define XLOG_STATE_DO_CALLBACK \
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0x0010 /* Process callback functions */
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#define XLOG_STATE_CALLBACK 0x0020 /* Callback functions now */
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#define XLOG_STATE_DIRTY 0x0040 /* Dirty IC log, not ready for ACTIVE status*/
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#define XLOG_STATE_IOERROR 0x0080 /* IO error happened in sync'ing log */
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#define XLOG_STATE_ALL 0x7FFF /* All possible valid flags */
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#define XLOG_STATE_NOTUSED 0x8000 /* This IC log not being used */
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#endif /* __KERNEL__ */
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/*
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* Flags to log operation header
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*
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* The first write of a new transaction will be preceded with a start
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* record, XLOG_START_TRANS. Once a transaction is committed, a commit
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* record is written, XLOG_COMMIT_TRANS. If a single region can not fit into
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* the remainder of the current active in-core log, it is split up into
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* multiple regions. Each partial region will be marked with a
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* XLOG_CONTINUE_TRANS until the last one, which gets marked with XLOG_END_TRANS.
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*
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*/
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#define XLOG_START_TRANS 0x01 /* Start a new transaction */
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#define XLOG_COMMIT_TRANS 0x02 /* Commit this transaction */
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#define XLOG_CONTINUE_TRANS 0x04 /* Cont this trans into new region */
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#define XLOG_WAS_CONT_TRANS 0x08 /* Cont this trans into new region */
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#define XLOG_END_TRANS 0x10 /* End a continued transaction */
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#define XLOG_UNMOUNT_TRANS 0x20 /* Unmount a filesystem transaction */
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#ifdef __KERNEL__
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/*
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* Flags to log ticket
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*/
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#define XLOG_TIC_INITED 0x1 /* has been initialized */
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#define XLOG_TIC_PERM_RESERV 0x2 /* permanent reservation */
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#define XLOG_TIC_IN_Q 0x4
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#endif /* __KERNEL__ */
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#define XLOG_UNMOUNT_TYPE 0x556e /* Un for Unmount */
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/*
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* Flags for log structure
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*/
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#define XLOG_CHKSUM_MISMATCH 0x1 /* used only during recovery */
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#define XLOG_ACTIVE_RECOVERY 0x2 /* in the middle of recovery */
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#define XLOG_RECOVERY_NEEDED 0x4 /* log was recovered */
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#define XLOG_IO_ERROR 0x8 /* log hit an I/O error, and being
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shutdown */
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typedef __uint32_t xlog_tid_t;
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#ifdef __KERNEL__
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/*
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* Below are states for covering allocation transactions.
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* By covering, we mean changing the h_tail_lsn in the last on-disk
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* log write such that no allocation transactions will be re-done during
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* recovery after a system crash. Recovery starts at the last on-disk
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* log write.
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*
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* These states are used to insert dummy log entries to cover
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* space allocation transactions which can undo non-transactional changes
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* after a crash. Writes to a file with space
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* already allocated do not result in any transactions. Allocations
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* might include space beyond the EOF. So if we just push the EOF a
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* little, the last transaction for the file could contain the wrong
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* size. If there is no file system activity, after an allocation
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* transaction, and the system crashes, the allocation transaction
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* will get replayed and the file will be truncated. This could
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* be hours/days/... after the allocation occurred.
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*
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* The fix for this is to do two dummy transactions when the
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* system is idle. We need two dummy transaction because the h_tail_lsn
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* in the log record header needs to point beyond the last possible
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* non-dummy transaction. The first dummy changes the h_tail_lsn to
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* the first transaction before the dummy. The second dummy causes
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* h_tail_lsn to point to the first dummy. Recovery starts at h_tail_lsn.
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*
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* These dummy transactions get committed when everything
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* is idle (after there has been some activity).
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*
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* There are 5 states used to control this.
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*
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* IDLE -- no logging has been done on the file system or
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* we are done covering previous transactions.
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* NEED -- logging has occurred and we need a dummy transaction
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* when the log becomes idle.
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* DONE -- we were in the NEED state and have committed a dummy
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* transaction.
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* NEED2 -- we detected that a dummy transaction has gone to the
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* on disk log with no other transactions.
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* DONE2 -- we committed a dummy transaction when in the NEED2 state.
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*
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* There are two places where we switch states:
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*
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* 1.) In xfs_sync, when we detect an idle log and are in NEED or NEED2.
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* We commit the dummy transaction and switch to DONE or DONE2,
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* respectively. In all other states, we don't do anything.
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*
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* 2.) When we finish writing the on-disk log (xlog_state_clean_log).
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*
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* No matter what state we are in, if this isn't the dummy
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* transaction going out, the next state is NEED.
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* So, if we aren't in the DONE or DONE2 states, the next state
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* is NEED. We can't be finishing a write of the dummy record
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* unless it was committed and the state switched to DONE or DONE2.
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*
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* If we are in the DONE state and this was a write of the
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* dummy transaction, we move to NEED2.
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*
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* If we are in the DONE2 state and this was a write of the
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* dummy transaction, we move to IDLE.
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*
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*
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* Writing only one dummy transaction can get appended to
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* one file space allocation. When this happens, the log recovery
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* code replays the space allocation and a file could be truncated.
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* This is why we have the NEED2 and DONE2 states before going idle.
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*/
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#define XLOG_STATE_COVER_IDLE 0
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#define XLOG_STATE_COVER_NEED 1
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#define XLOG_STATE_COVER_DONE 2
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#define XLOG_STATE_COVER_NEED2 3
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#define XLOG_STATE_COVER_DONE2 4
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#define XLOG_COVER_OPS 5
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/* Ticket reservation region accounting */
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#define XLOG_TIC_LEN_MAX 15
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#define XLOG_TIC_RESET_RES(t) ((t)->t_res_num = \
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(t)->t_res_arr_sum = (t)->t_res_num_ophdrs = 0)
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#define XLOG_TIC_ADD_OPHDR(t) ((t)->t_res_num_ophdrs++)
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#define XLOG_TIC_ADD_REGION(t, len, type) \
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do { \
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if ((t)->t_res_num == XLOG_TIC_LEN_MAX) { \
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/* add to overflow and start again */ \
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(t)->t_res_o_flow += (t)->t_res_arr_sum; \
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(t)->t_res_num = 0; \
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(t)->t_res_arr_sum = 0; \
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} \
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(t)->t_res_arr[(t)->t_res_num].r_len = (len); \
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(t)->t_res_arr[(t)->t_res_num].r_type = (type); \
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(t)->t_res_arr_sum += (len); \
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(t)->t_res_num++; \
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} while (0)
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/*
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* Reservation region
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* As would be stored in xfs_log_iovec but without the i_addr which
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* we don't care about.
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*/
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typedef struct xlog_res {
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uint r_len; /* region length :4 */
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uint r_type; /* region's transaction type :4 */
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} xlog_res_t;
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typedef struct xlog_ticket {
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sv_t t_sema; /* sleep on this semaphore : 20 */
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struct xlog_ticket *t_next; /* :4|8 */
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struct xlog_ticket *t_prev; /* :4|8 */
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xlog_tid_t t_tid; /* transaction identifier : 4 */
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int t_curr_res; /* current reservation in bytes : 4 */
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int t_unit_res; /* unit reservation in bytes : 4 */
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char t_ocnt; /* original count : 1 */
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char t_cnt; /* current count : 1 */
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char t_clientid; /* who does this belong to; : 1 */
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char t_flags; /* properties of reservation : 1 */
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uint t_trans_type; /* transaction type : 4 */
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/* reservation array fields */
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uint t_res_num; /* num in array : 4 */
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uint t_res_num_ophdrs; /* num op hdrs : 4 */
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uint t_res_arr_sum; /* array sum : 4 */
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uint t_res_o_flow; /* sum overflow : 4 */
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xlog_res_t t_res_arr[XLOG_TIC_LEN_MAX]; /* array of res : 8 * 15 */
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} xlog_ticket_t;
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#endif
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typedef struct xlog_op_header {
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xlog_tid_t oh_tid; /* transaction id of operation : 4 b */
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int oh_len; /* bytes in data region : 4 b */
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__uint8_t oh_clientid; /* who sent me this : 1 b */
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__uint8_t oh_flags; /* : 1 b */
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ushort oh_res2; /* 32 bit align : 2 b */
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} xlog_op_header_t;
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/* valid values for h_fmt */
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#define XLOG_FMT_UNKNOWN 0
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#define XLOG_FMT_LINUX_LE 1
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#define XLOG_FMT_LINUX_BE 2
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#define XLOG_FMT_IRIX_BE 3
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/* our fmt */
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#ifdef XFS_NATIVE_HOST
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#define XLOG_FMT XLOG_FMT_LINUX_BE
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#else
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#define XLOG_FMT XLOG_FMT_LINUX_LE
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#endif
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typedef struct xlog_rec_header {
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uint h_magicno; /* log record (LR) identifier : 4 */
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uint h_cycle; /* write cycle of log : 4 */
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int h_version; /* LR version : 4 */
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int h_len; /* len in bytes; should be 64-bit aligned: 4 */
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xfs_lsn_t h_lsn; /* lsn of this LR : 8 */
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xfs_lsn_t h_tail_lsn; /* lsn of 1st LR w/ buffers not committed: 8 */
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uint h_chksum; /* may not be used; non-zero if used : 4 */
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int h_prev_block; /* block number to previous LR : 4 */
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int h_num_logops; /* number of log operations in this LR : 4 */
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uint h_cycle_data[XLOG_HEADER_CYCLE_SIZE / BBSIZE];
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/* new fields */
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int h_fmt; /* format of log record : 4 */
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uuid_t h_fs_uuid; /* uuid of FS : 16 */
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int h_size; /* iclog size : 4 */
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} xlog_rec_header_t;
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typedef struct xlog_rec_ext_header {
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uint xh_cycle; /* write cycle of log : 4 */
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uint xh_cycle_data[XLOG_HEADER_CYCLE_SIZE / BBSIZE]; /* : 256 */
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} xlog_rec_ext_header_t;
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#ifdef __KERNEL__
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/*
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* - A log record header is 512 bytes. There is plenty of room to grow the
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* xlog_rec_header_t into the reserved space.
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* - ic_data follows, so a write to disk can start at the beginning of
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* the iclog.
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* - ic_forcesema is used to implement synchronous forcing of the iclog to disk.
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* - ic_next is the pointer to the next iclog in the ring.
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* - ic_bp is a pointer to the buffer used to write this incore log to disk.
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* - ic_log is a pointer back to the global log structure.
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* - ic_callback is a linked list of callback function/argument pairs to be
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* called after an iclog finishes writing.
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* - ic_size is the full size of the header plus data.
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* - ic_offset is the current number of bytes written to in this iclog.
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* - ic_refcnt is bumped when someone is writing to the log.
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* - ic_state is the state of the iclog.
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*/
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typedef struct xlog_iclog_fields {
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sv_t ic_forcesema;
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sv_t ic_writesema;
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struct xlog_in_core *ic_next;
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struct xlog_in_core *ic_prev;
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struct xfs_buf *ic_bp;
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struct log *ic_log;
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xfs_log_callback_t *ic_callback;
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xfs_log_callback_t **ic_callback_tail;
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#ifdef XFS_LOG_TRACE
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struct ktrace *ic_trace;
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#endif
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int ic_size;
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int ic_offset;
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int ic_refcnt;
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int ic_bwritecnt;
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ushort_t ic_state;
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char *ic_datap; /* pointer to iclog data */
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} xlog_iclog_fields_t;
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typedef union xlog_in_core2 {
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xlog_rec_header_t hic_header;
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xlog_rec_ext_header_t hic_xheader;
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char hic_sector[XLOG_HEADER_SIZE];
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} xlog_in_core_2_t;
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typedef struct xlog_in_core {
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xlog_iclog_fields_t hic_fields;
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xlog_in_core_2_t *hic_data;
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} xlog_in_core_t;
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/*
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* Defines to save our code from this glop.
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*/
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#define ic_forcesema hic_fields.ic_forcesema
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#define ic_writesema hic_fields.ic_writesema
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#define ic_next hic_fields.ic_next
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#define ic_prev hic_fields.ic_prev
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#define ic_bp hic_fields.ic_bp
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#define ic_log hic_fields.ic_log
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#define ic_callback hic_fields.ic_callback
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#define ic_callback_tail hic_fields.ic_callback_tail
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#define ic_trace hic_fields.ic_trace
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#define ic_size hic_fields.ic_size
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#define ic_offset hic_fields.ic_offset
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#define ic_refcnt hic_fields.ic_refcnt
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#define ic_bwritecnt hic_fields.ic_bwritecnt
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#define ic_state hic_fields.ic_state
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#define ic_datap hic_fields.ic_datap
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#define ic_header hic_data->hic_header
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/*
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* The reservation head lsn is not made up of a cycle number and block number.
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* Instead, it uses a cycle number and byte number. Logs don't expect to
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* overflow 31 bits worth of byte offset, so using a byte number will mean
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* that round off problems won't occur when releasing partial reservations.
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*/
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typedef struct log {
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/* The following block of fields are changed while holding icloglock */
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sema_t l_flushsema; /* iclog flushing semaphore */
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int l_flushcnt; /* # of procs waiting on this
|
|
* sema */
|
|
int l_ticket_cnt; /* free ticket count */
|
|
int l_ticket_tcnt; /* total ticket count */
|
|
int l_covered_state;/* state of "covering disk
|
|
* log entries" */
|
|
xlog_ticket_t *l_freelist; /* free list of tickets */
|
|
xlog_ticket_t *l_unmount_free;/* kmem_free these addresses */
|
|
xlog_ticket_t *l_tail; /* free list of tickets */
|
|
xlog_in_core_t *l_iclog; /* head log queue */
|
|
lock_t l_icloglock; /* grab to change iclog state */
|
|
xfs_lsn_t l_tail_lsn; /* lsn of 1st LR with unflushed
|
|
* buffers */
|
|
xfs_lsn_t l_last_sync_lsn;/* lsn of last LR on disk */
|
|
struct xfs_mount *l_mp; /* mount point */
|
|
struct xfs_buf *l_xbuf; /* extra buffer for log
|
|
* wrapping */
|
|
struct xfs_buftarg *l_targ; /* buftarg of log */
|
|
xfs_daddr_t l_logBBstart; /* start block of log */
|
|
int l_logsize; /* size of log in bytes */
|
|
int l_logBBsize; /* size of log in BB chunks */
|
|
int l_curr_cycle; /* Cycle number of log writes */
|
|
int l_prev_cycle; /* Cycle number before last
|
|
* block increment */
|
|
int l_curr_block; /* current logical log block */
|
|
int l_prev_block; /* previous logical log block */
|
|
int l_iclog_size; /* size of log in bytes */
|
|
int l_iclog_size_log; /* log power size of log */
|
|
int l_iclog_bufs; /* number of iclog buffers */
|
|
|
|
/* The following field are used for debugging; need to hold icloglock */
|
|
char *l_iclog_bak[XLOG_MAX_ICLOGS];
|
|
|
|
/* The following block of fields are changed while holding grant_lock */
|
|
lock_t l_grant_lock;
|
|
xlog_ticket_t *l_reserve_headq;
|
|
xlog_ticket_t *l_write_headq;
|
|
int l_grant_reserve_cycle;
|
|
int l_grant_reserve_bytes;
|
|
int l_grant_write_cycle;
|
|
int l_grant_write_bytes;
|
|
|
|
/* The following fields don't need locking */
|
|
#ifdef XFS_LOG_TRACE
|
|
struct ktrace *l_trace;
|
|
struct ktrace *l_grant_trace;
|
|
#endif
|
|
uint l_flags;
|
|
uint l_quotaoffs_flag; /* XFS_DQ_*, for QUOTAOFFs */
|
|
struct xfs_buf_cancel **l_buf_cancel_table;
|
|
int l_iclog_hsize; /* size of iclog header */
|
|
int l_iclog_heads; /* # of iclog header sectors */
|
|
uint l_sectbb_log; /* log2 of sector size in BBs */
|
|
uint l_sectbb_mask; /* sector size (in BBs)
|
|
* alignment mask */
|
|
} xlog_t;
|
|
|
|
#define XLOG_FORCED_SHUTDOWN(log) ((log)->l_flags & XLOG_IO_ERROR)
|
|
|
|
|
|
/* common routines */
|
|
extern xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp);
|
|
extern int xlog_find_tail(xlog_t *log,
|
|
xfs_daddr_t *head_blk,
|
|
xfs_daddr_t *tail_blk);
|
|
extern int xlog_recover(xlog_t *log);
|
|
extern int xlog_recover_finish(xlog_t *log, int mfsi_flags);
|
|
extern void xlog_pack_data(xlog_t *log, xlog_in_core_t *iclog, int);
|
|
extern void xlog_recover_process_iunlinks(xlog_t *log);
|
|
|
|
extern struct xfs_buf *xlog_get_bp(xlog_t *, int);
|
|
extern void xlog_put_bp(struct xfs_buf *);
|
|
extern int xlog_bread(xlog_t *, xfs_daddr_t, int, struct xfs_buf *);
|
|
|
|
/* iclog tracing */
|
|
#define XLOG_TRACE_GRAB_FLUSH 1
|
|
#define XLOG_TRACE_REL_FLUSH 2
|
|
#define XLOG_TRACE_SLEEP_FLUSH 3
|
|
#define XLOG_TRACE_WAKE_FLUSH 4
|
|
|
|
/*
|
|
* Unmount record type is used as a pseudo transaction type for the ticket.
|
|
* It's value must be outside the range of XFS_TRANS_* values.
|
|
*/
|
|
#define XLOG_UNMOUNT_REC_TYPE (-1U)
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* __XFS_LOG_PRIV_H__ */
|