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Diffstat (limited to 'fs/xfs/xfs_log_format.h')
-rw-r--r-- | fs/xfs/xfs_log_format.h | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/fs/xfs/xfs_log_format.h b/fs/xfs/xfs_log_format.h new file mode 100644 index 0000000..9f9aeb6 --- /dev/null +++ b/fs/xfs/xfs_log_format.h @@ -0,0 +1,178 @@ +/* + * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. + * All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ +#ifndef __XFS_LOG_FORMAT_H__ +#define __XFS_LOG_FORMAT_H__ + +typedef __uint32_t xlog_tid_t; + +#define XLOG_MIN_ICLOGS 2 +#define XLOG_MAX_ICLOGS 8 +#define XLOG_HEADER_MAGIC_NUM 0xFEEDbabe /* Invalid cycle number */ +#define XLOG_VERSION_1 1 +#define XLOG_VERSION_2 2 /* Large IClogs, Log sunit */ +#define XLOG_VERSION_OKBITS (XLOG_VERSION_1 | XLOG_VERSION_2) +#define XLOG_MIN_RECORD_BSIZE (16*1024) /* eventually 32k */ +#define XLOG_BIG_RECORD_BSIZE (32*1024) /* 32k buffers */ +#define XLOG_MAX_RECORD_BSIZE (256*1024) +#define XLOG_HEADER_CYCLE_SIZE (32*1024) /* cycle data in header */ +#define XLOG_MIN_RECORD_BSHIFT 14 /* 16384 == 1 << 14 */ +#define XLOG_BIG_RECORD_BSHIFT 15 /* 32k == 1 << 15 */ +#define XLOG_MAX_RECORD_BSHIFT 18 /* 256k == 1 << 18 */ +#define XLOG_BTOLSUNIT(log, b) (((b)+(log)->l_mp->m_sb.sb_logsunit-1) / \ + (log)->l_mp->m_sb.sb_logsunit) +#define XLOG_LSUNITTOB(log, su) ((su) * (log)->l_mp->m_sb.sb_logsunit) + +#define XLOG_HEADER_SIZE 512 + +#define XLOG_REC_SHIFT(log) \ + BTOBB(1 << (xfs_sb_version_haslogv2(&log->l_mp->m_sb) ? \ + XLOG_MAX_RECORD_BSHIFT : XLOG_BIG_RECORD_BSHIFT)) +#define XLOG_TOTAL_REC_SHIFT(log) \ + BTOBB(XLOG_MAX_ICLOGS << (xfs_sb_version_haslogv2(&log->l_mp->m_sb) ? \ + XLOG_MAX_RECORD_BSHIFT : XLOG_BIG_RECORD_BSHIFT)) + +/* get lsn fields */ +#define CYCLE_LSN(lsn) ((uint)((lsn)>>32)) +#define BLOCK_LSN(lsn) ((uint)(lsn)) + +/* this is used in a spot where we might otherwise double-endian-flip */ +#define CYCLE_LSN_DISK(lsn) (((__be32 *)&(lsn))[0]) + +static inline xfs_lsn_t xlog_assign_lsn(uint cycle, uint block) +{ + return ((xfs_lsn_t)cycle << 32) | block; +} + +static inline uint xlog_get_cycle(char *ptr) +{ + if (be32_to_cpu(*(__be32 *)ptr) == XLOG_HEADER_MAGIC_NUM) + return be32_to_cpu(*((__be32 *)ptr + 1)); + else + return be32_to_cpu(*(__be32 *)ptr); +} + +/* Log Clients */ +#define XFS_TRANSACTION 0x69 +#define XFS_VOLUME 0x2 +#define XFS_LOG 0xaa + +#define XLOG_UNMOUNT_TYPE 0x556e /* Un for Unmount */ + +/* Region types for iovec's i_type */ +#define XLOG_REG_TYPE_BFORMAT 1 +#define XLOG_REG_TYPE_BCHUNK 2 +#define XLOG_REG_TYPE_EFI_FORMAT 3 +#define XLOG_REG_TYPE_EFD_FORMAT 4 +#define XLOG_REG_TYPE_IFORMAT 5 +#define XLOG_REG_TYPE_ICORE 6 +#define XLOG_REG_TYPE_IEXT 7 +#define XLOG_REG_TYPE_IBROOT 8 +#define XLOG_REG_TYPE_ILOCAL 9 +#define XLOG_REG_TYPE_IATTR_EXT 10 +#define XLOG_REG_TYPE_IATTR_BROOT 11 +#define XLOG_REG_TYPE_IATTR_LOCAL 12 +#define XLOG_REG_TYPE_QFORMAT 13 +#define XLOG_REG_TYPE_DQUOT 14 +#define XLOG_REG_TYPE_QUOTAOFF 15 +#define XLOG_REG_TYPE_LRHEADER 16 +#define XLOG_REG_TYPE_UNMOUNT 17 +#define XLOG_REG_TYPE_COMMIT 18 +#define XLOG_REG_TYPE_TRANSHDR 19 +#define XLOG_REG_TYPE_ICREATE 20 +#define XLOG_REG_TYPE_MAX 20 + +/* + * Flags to log operation header + * + * The first write of a new transaction will be preceded with a start + * record, XLOG_START_TRANS. Once a transaction is committed, a commit + * record is written, XLOG_COMMIT_TRANS. If a single region can not fit into + * the remainder of the current active in-core log, it is split up into + * multiple regions. Each partial region will be marked with a + * XLOG_CONTINUE_TRANS until the last one, which gets marked with XLOG_END_TRANS. + * + */ +#define XLOG_START_TRANS 0x01 /* Start a new transaction */ +#define XLOG_COMMIT_TRANS 0x02 /* Commit this transaction */ +#define XLOG_CONTINUE_TRANS 0x04 /* Cont this trans into new region */ +#define XLOG_WAS_CONT_TRANS 0x08 /* Cont this trans into new region */ +#define XLOG_END_TRANS 0x10 /* End a continued transaction */ +#define XLOG_UNMOUNT_TRANS 0x20 /* Unmount a filesystem transaction */ + + +typedef struct xlog_op_header { + __be32 oh_tid; /* transaction id of operation : 4 b */ + __be32 oh_len; /* bytes in data region : 4 b */ + __u8 oh_clientid; /* who sent me this : 1 b */ + __u8 oh_flags; /* : 1 b */ + __u16 oh_res2; /* 32 bit align : 2 b */ +} xlog_op_header_t; + + +/* valid values for h_fmt */ +#define XLOG_FMT_UNKNOWN 0 +#define XLOG_FMT_LINUX_LE 1 +#define XLOG_FMT_LINUX_BE 2 +#define XLOG_FMT_IRIX_BE 3 + +/* our fmt */ +#ifdef XFS_NATIVE_HOST +#define XLOG_FMT XLOG_FMT_LINUX_BE +#else +#define XLOG_FMT XLOG_FMT_LINUX_LE +#endif + +typedef struct xlog_rec_header { + __be32 h_magicno; /* log record (LR) identifier : 4 */ + __be32 h_cycle; /* write cycle of log : 4 */ + __be32 h_version; /* LR version : 4 */ + __be32 h_len; /* len in bytes; should be 64-bit aligned: 4 */ + __be64 h_lsn; /* lsn of this LR : 8 */ + __be64 h_tail_lsn; /* lsn of 1st LR w/ buffers not committed: 8 */ + __le32 h_crc; /* crc of log record : 4 */ + __be32 h_prev_block; /* block number to previous LR : 4 */ + __be32 h_num_logops; /* number of log operations in this LR : 4 */ + __be32 h_cycle_data[XLOG_HEADER_CYCLE_SIZE / BBSIZE]; + /* new fields */ + __be32 h_fmt; /* format of log record : 4 */ + uuid_t h_fs_uuid; /* uuid of FS : 16 */ + __be32 h_size; /* iclog size : 4 */ +} xlog_rec_header_t; + +typedef struct xlog_rec_ext_header { + __be32 xh_cycle; /* write cycle of log : 4 */ + __be32 xh_cycle_data[XLOG_HEADER_CYCLE_SIZE / BBSIZE]; /* : 256 */ +} xlog_rec_ext_header_t; + +/* + * Quite misnamed, because this union lays out the actual on-disk log buffer. + */ +typedef union xlog_in_core2 { + xlog_rec_header_t hic_header; + xlog_rec_ext_header_t hic_xheader; + char hic_sector[XLOG_HEADER_SIZE]; +} xlog_in_core_2_t; + +/* not an on-disk structure, but needed by log recovery in userspace */ +typedef struct xfs_log_iovec { + void *i_addr; /* beginning address of region */ + int i_len; /* length in bytes of region */ + uint i_type; /* type of region */ +} xfs_log_iovec_t; + +#endif /* __XFS_LOG_FORMAT_H__ */ |