Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

[linux/fpc-iii.git] / fs / xfs / libxfs / xfs_log_format.h

/*
 * 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__

struct xfs_mount;
struct xfs_trans_res;

/*
 * On-disk Log Format definitions.
 *
 * This file contains all the on-disk format definitions used within the log. It
 * includes the physical log structure itself, as well as all the log item
 * format structures that are written into the log and intepreted by log
 * recovery. We start with the physical log format definitions, and then work
 * through all the log items definitions and everything they encode into the
 * log.
 */
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

/* Minimum number of transactions that must fit in the log (defined by mkfs) */
#define XFS_MIN_LOG_FACTOR      3

#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;


/*
 * Transaction Header definitions.
 *
 * This is the structure written in the log at the head of every transaction. It
 * identifies the type and id of the transaction, and contains the number of
 * items logged by the transaction so we know how many to expect during
 * recovery.
 *
 * Do not change the below structure without redoing the code in
 * xlog_recover_add_to_trans() and xlog_recover_add_to_cont_trans().
 */
typedef struct xfs_trans_header {
        uint            th_magic;               /* magic number */
        uint            th_type;                /* transaction type */
        __int32_t       th_tid;                 /* transaction id (unused) */
        uint            th_num_items;           /* num items logged by trans */
} xfs_trans_header_t;

#define XFS_TRANS_HEADER_MAGIC  0x5452414e      /* TRAN */

/*
 * The only type valid for th_type in CIL-enabled file system logs:
 */
#define XFS_TRANS_CHECKPOINT    40

/*
 * Log item types.
 */
#define XFS_LI_EFI              0x1236
#define XFS_LI_EFD              0x1237
#define XFS_LI_IUNLINK          0x1238
#define XFS_LI_INODE            0x123b  /* aligned ino chunks, var-size ibufs */
#define XFS_LI_BUF              0x123c  /* v2 bufs, variable sized inode bufs */
#define XFS_LI_DQUOT            0x123d
#define XFS_LI_QUOTAOFF         0x123e
#define XFS_LI_ICREATE          0x123f

#define XFS_LI_TYPE_DESC \
        { XFS_LI_EFI,           "XFS_LI_EFI" }, \
        { XFS_LI_EFD,           "XFS_LI_EFD" }, \
        { XFS_LI_IUNLINK,       "XFS_LI_IUNLINK" }, \
        { XFS_LI_INODE,         "XFS_LI_INODE" }, \
        { XFS_LI_BUF,           "XFS_LI_BUF" }, \
        { XFS_LI_DQUOT,         "XFS_LI_DQUOT" }, \
        { XFS_LI_QUOTAOFF,      "XFS_LI_QUOTAOFF" }, \
        { XFS_LI_ICREATE,       "XFS_LI_ICREATE" }

/*
 * Inode Log Item Format definitions.
 *
 * This is the structure used to lay out an inode log item in the
 * log.  The size of the inline data/extents/b-tree root to be logged
 * (if any) is indicated in the ilf_dsize field.  Changes to this structure
 * must be added on to the end.
 */
typedef struct xfs_inode_log_format {
        __uint16_t              ilf_type;       /* inode log item type */
        __uint16_t              ilf_size;       /* size of this item */
        __uint32_t              ilf_fields;     /* flags for fields logged */
        __uint16_t              ilf_asize;      /* size of attr d/ext/root */
        __uint16_t              ilf_dsize;      /* size of data/ext/root */
        __uint64_t              ilf_ino;        /* inode number */
        union {
                __uint32_t      ilfu_rdev;      /* rdev value for dev inode*/
                uuid_t          ilfu_uuid;      /* mount point value */
        } ilf_u;
        __int64_t               ilf_blkno;      /* blkno of inode buffer */
        __int32_t               ilf_len;        /* len of inode buffer */
        __int32_t               ilf_boffset;    /* off of inode in buffer */
} xfs_inode_log_format_t;

typedef struct xfs_inode_log_format_32 {
        __uint16_t              ilf_type;       /* inode log item type */
        __uint16_t              ilf_size;       /* size of this item */
        __uint32_t              ilf_fields;     /* flags for fields logged */
        __uint16_t              ilf_asize;      /* size of attr d/ext/root */
        __uint16_t              ilf_dsize;      /* size of data/ext/root */
        __uint64_t              ilf_ino;        /* inode number */
        union {
                __uint32_t      ilfu_rdev;      /* rdev value for dev inode*/
                uuid_t          ilfu_uuid;      /* mount point value */
        } ilf_u;
        __int64_t               ilf_blkno;      /* blkno of inode buffer */
        __int32_t               ilf_len;        /* len of inode buffer */
        __int32_t               ilf_boffset;    /* off of inode in buffer */
} __attribute__((packed)) xfs_inode_log_format_32_t;

typedef struct xfs_inode_log_format_64 {
        __uint16_t              ilf_type;       /* inode log item type */
        __uint16_t              ilf_size;       /* size of this item */
        __uint32_t              ilf_fields;     /* flags for fields logged */
        __uint16_t              ilf_asize;      /* size of attr d/ext/root */
        __uint16_t              ilf_dsize;      /* size of data/ext/root */
        __uint32_t              ilf_pad;        /* pad for 64 bit boundary */
        __uint64_t              ilf_ino;        /* inode number */
        union {
                __uint32_t      ilfu_rdev;      /* rdev value for dev inode*/
                uuid_t          ilfu_uuid;      /* mount point value */
        } ilf_u;
        __int64_t               ilf_blkno;      /* blkno of inode buffer */
        __int32_t               ilf_len;        /* len of inode buffer */
        __int32_t               ilf_boffset;    /* off of inode in buffer */
} xfs_inode_log_format_64_t;


/*
 * Flags for xfs_trans_log_inode flags field.
 */
#define XFS_ILOG_CORE   0x001   /* log standard inode fields */
#define XFS_ILOG_DDATA  0x002   /* log i_df.if_data */
#define XFS_ILOG_DEXT   0x004   /* log i_df.if_extents */
#define XFS_ILOG_DBROOT 0x008   /* log i_df.i_broot */
#define XFS_ILOG_DEV    0x010   /* log the dev field */
#define XFS_ILOG_UUID   0x020   /* log the uuid field */
#define XFS_ILOG_ADATA  0x040   /* log i_af.if_data */
#define XFS_ILOG_AEXT   0x080   /* log i_af.if_extents */
#define XFS_ILOG_ABROOT 0x100   /* log i_af.i_broot */
#define XFS_ILOG_DOWNER 0x200   /* change the data fork owner on replay */
#define XFS_ILOG_AOWNER 0x400   /* change the attr fork owner on replay */


/*
 * The timestamps are dirty, but not necessarily anything else in the inode
 * core.  Unlike the other fields above this one must never make it to disk
 * in the ilf_fields of the inode_log_format, but is purely store in-memory in
 * ili_fields in the inode_log_item.
 */
#define XFS_ILOG_TIMESTAMP      0x4000

#define XFS_ILOG_NONCORE        (XFS_ILOG_DDATA | XFS_ILOG_DEXT | \
                                 XFS_ILOG_DBROOT | XFS_ILOG_DEV | \
                                 XFS_ILOG_UUID | XFS_ILOG_ADATA | \
                                 XFS_ILOG_AEXT | XFS_ILOG_ABROOT | \
                                 XFS_ILOG_DOWNER | XFS_ILOG_AOWNER)

#define XFS_ILOG_DFORK          (XFS_ILOG_DDATA | XFS_ILOG_DEXT | \
                                 XFS_ILOG_DBROOT)

#define XFS_ILOG_AFORK          (XFS_ILOG_ADATA | XFS_ILOG_AEXT | \
                                 XFS_ILOG_ABROOT)

#define XFS_ILOG_ALL            (XFS_ILOG_CORE | XFS_ILOG_DDATA | \
                                 XFS_ILOG_DEXT | XFS_ILOG_DBROOT | \
                                 XFS_ILOG_DEV | XFS_ILOG_UUID | \
                                 XFS_ILOG_ADATA | XFS_ILOG_AEXT | \
                                 XFS_ILOG_ABROOT | XFS_ILOG_TIMESTAMP | \
                                 XFS_ILOG_DOWNER | XFS_ILOG_AOWNER)

static inline int xfs_ilog_fbroot(int w)
{
        return (w == XFS_DATA_FORK ? XFS_ILOG_DBROOT : XFS_ILOG_ABROOT);
}

static inline int xfs_ilog_fext(int w)
{
        return (w == XFS_DATA_FORK ? XFS_ILOG_DEXT : XFS_ILOG_AEXT);
}

static inline int xfs_ilog_fdata(int w)
{
        return (w == XFS_DATA_FORK ? XFS_ILOG_DDATA : XFS_ILOG_ADATA);
}

/*
 * Incore version of the on-disk inode core structures. We log this directly
 * into the journal in host CPU format (for better or worse) and as such
 * directly mirrors the xfs_dinode structure as it must contain all the same
 * information.
 */
typedef struct xfs_ictimestamp {
        __int32_t       t_sec;          /* timestamp seconds */
        __int32_t       t_nsec;         /* timestamp nanoseconds */
} xfs_ictimestamp_t;

/*
 * Define the format of the inode core that is logged. This structure must be
 * kept identical to struct xfs_dinode except for the endianness annotations.
 */
struct xfs_log_dinode {
        __uint16_t      di_magic;       /* inode magic # = XFS_DINODE_MAGIC */
        __uint16_t      di_mode;        /* mode and type of file */
        __int8_t        di_version;     /* inode version */
        __int8_t        di_format;      /* format of di_c data */
        __uint8_t       di_pad3[2];     /* unused in v2/3 inodes */
        __uint32_t      di_uid;         /* owner's user id */
        __uint32_t      di_gid;         /* owner's group id */
        __uint32_t      di_nlink;       /* number of links to file */
        __uint16_t      di_projid_lo;   /* lower part of owner's project id */
        __uint16_t      di_projid_hi;   /* higher part of owner's project id */
        __uint8_t       di_pad[6];      /* unused, zeroed space */
        __uint16_t      di_flushiter;   /* incremented on flush */
        xfs_ictimestamp_t di_atime;     /* time last accessed */
        xfs_ictimestamp_t di_mtime;     /* time last modified */
        xfs_ictimestamp_t di_ctime;     /* time created/inode modified */
        xfs_fsize_t     di_size;        /* number of bytes in file */
        xfs_rfsblock_t  di_nblocks;     /* # of direct & btree blocks used */
        xfs_extlen_t    di_extsize;     /* basic/minimum extent size for file */
        xfs_extnum_t    di_nextents;    /* number of extents in data fork */
        xfs_aextnum_t   di_anextents;   /* number of extents in attribute fork*/
        __uint8_t       di_forkoff;     /* attr fork offs, <<3 for 64b align */
        __int8_t        di_aformat;     /* format of attr fork's data */
        __uint32_t      di_dmevmask;    /* DMIG event mask */
        __uint16_t      di_dmstate;     /* DMIG state info */
        __uint16_t      di_flags;       /* random flags, XFS_DIFLAG_... */
        __uint32_t      di_gen;         /* generation number */

        /* di_next_unlinked is the only non-core field in the old dinode */
        xfs_agino_t     di_next_unlinked;/* agi unlinked list ptr */

        /* start of the extended dinode, writable fields */
        __uint32_t      di_crc;         /* CRC of the inode */
        __uint64_t      di_changecount; /* number of attribute changes */
        xfs_lsn_t       di_lsn;         /* flush sequence */
        __uint64_t      di_flags2;      /* more random flags */
        __uint8_t       di_pad2[16];    /* more padding for future expansion */

        /* fields only written to during inode creation */
        xfs_ictimestamp_t di_crtime;    /* time created */
        xfs_ino_t       di_ino;         /* inode number */
        uuid_t          di_uuid;        /* UUID of the filesystem */

        /* structure must be padded to 64 bit alignment */
};

static inline uint xfs_log_dinode_size(int version)
{
        if (version == 3)
                return sizeof(struct xfs_log_dinode);
        return offsetof(struct xfs_log_dinode, di_next_unlinked);
}

/*
 * Buffer Log Format defintions
 *
 * These are the physical dirty bitmap defintions for the log format structure.
 */
#define XFS_BLF_CHUNK           128
#define XFS_BLF_SHIFT           7
#define BIT_TO_WORD_SHIFT       5
#define NBWORD                  (NBBY * sizeof(unsigned int))

/*
 * This flag indicates that the buffer contains on disk inodes
 * and requires special recovery handling.
 */
#define XFS_BLF_INODE_BUF       (1<<0)

/*
 * This flag indicates that the buffer should not be replayed
 * during recovery because its blocks are being freed.
 */
#define XFS_BLF_CANCEL          (1<<1)

/*
 * This flag indicates that the buffer contains on disk
 * user or group dquots and may require special recovery handling.
 */
#define XFS_BLF_UDQUOT_BUF      (1<<2)
#define XFS_BLF_PDQUOT_BUF      (1<<3)
#define XFS_BLF_GDQUOT_BUF      (1<<4)

/*
 * This is the structure used to lay out a buf log item in the
 * log.  The data map describes which 128 byte chunks of the buffer
 * have been logged.
 */
#define XFS_BLF_DATAMAP_SIZE    ((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) / NBWORD)

typedef struct xfs_buf_log_format {
        unsigned short  blf_type;       /* buf log item type indicator */
        unsigned short  blf_size;       /* size of this item */
        ushort          blf_flags;      /* misc state */
        ushort          blf_len;        /* number of blocks in this buf */
        __int64_t       blf_blkno;      /* starting blkno of this buf */
        unsigned int    blf_map_size;   /* used size of data bitmap in words */
        unsigned int    blf_data_map[XFS_BLF_DATAMAP_SIZE]; /* dirty bitmap */
} xfs_buf_log_format_t;

/*
 * All buffers now need to tell recovery where the magic number
 * is so that it can verify and calculate the CRCs on the buffer correctly
 * once the changes have been replayed into the buffer.
 *
 * The type value is held in the upper 5 bits of the blf_flags field, which is
 * an unsigned 16 bit field. Hence we need to shift it 11 bits up and down.
 */
#define XFS_BLFT_BITS   5
#define XFS_BLFT_SHIFT  11
#define XFS_BLFT_MASK   (((1 << XFS_BLFT_BITS) - 1) << XFS_BLFT_SHIFT)

enum xfs_blft {
        XFS_BLFT_UNKNOWN_BUF = 0,
        XFS_BLFT_UDQUOT_BUF,
        XFS_BLFT_PDQUOT_BUF,
        XFS_BLFT_GDQUOT_BUF,
        XFS_BLFT_BTREE_BUF,
        XFS_BLFT_AGF_BUF,
        XFS_BLFT_AGFL_BUF,
        XFS_BLFT_AGI_BUF,
        XFS_BLFT_DINO_BUF,
        XFS_BLFT_SYMLINK_BUF,
        XFS_BLFT_DIR_BLOCK_BUF,
        XFS_BLFT_DIR_DATA_BUF,
        XFS_BLFT_DIR_FREE_BUF,
        XFS_BLFT_DIR_LEAF1_BUF,
        XFS_BLFT_DIR_LEAFN_BUF,
        XFS_BLFT_DA_NODE_BUF,
        XFS_BLFT_ATTR_LEAF_BUF,
        XFS_BLFT_ATTR_RMT_BUF,
        XFS_BLFT_SB_BUF,
        XFS_BLFT_RTBITMAP_BUF,
        XFS_BLFT_RTSUMMARY_BUF,
        XFS_BLFT_MAX_BUF = (1 << XFS_BLFT_BITS),
};

static inline void
xfs_blft_to_flags(struct xfs_buf_log_format *blf, enum xfs_blft type)
{
        ASSERT(type > XFS_BLFT_UNKNOWN_BUF && type < XFS_BLFT_MAX_BUF);
        blf->blf_flags &= ~XFS_BLFT_MASK;
        blf->blf_flags |= ((type << XFS_BLFT_SHIFT) & XFS_BLFT_MASK);
}

static inline __uint16_t
xfs_blft_from_flags(struct xfs_buf_log_format *blf)
{
        return (blf->blf_flags & XFS_BLFT_MASK) >> XFS_BLFT_SHIFT;
}

/*
 * EFI/EFD log format definitions
 */
typedef struct xfs_extent {
        xfs_fsblock_t   ext_start;
        xfs_extlen_t    ext_len;
} xfs_extent_t;

/*
 * Since an xfs_extent_t has types (start:64, len: 32)
 * there are different alignments on 32 bit and 64 bit kernels.
 * So we provide the different variants for use by a
 * conversion routine.
 */
typedef struct xfs_extent_32 {
        __uint64_t      ext_start;
        __uint32_t      ext_len;
} __attribute__((packed)) xfs_extent_32_t;

typedef struct xfs_extent_64 {
        __uint64_t      ext_start;
        __uint32_t      ext_len;
        __uint32_t      ext_pad;
} xfs_extent_64_t;

/*
 * This is the structure used to lay out an efi log item in the
 * log.  The efi_extents field is a variable size array whose
 * size is given by efi_nextents.
 */
typedef struct xfs_efi_log_format {
        __uint16_t              efi_type;       /* efi log item type */
        __uint16_t              efi_size;       /* size of this item */
        __uint32_t              efi_nextents;   /* # extents to free */
        __uint64_t              efi_id;         /* efi identifier */
        xfs_extent_t            efi_extents[1]; /* array of extents to free */
} xfs_efi_log_format_t;

typedef struct xfs_efi_log_format_32 {
        __uint16_t              efi_type;       /* efi log item type */
        __uint16_t              efi_size;       /* size of this item */
        __uint32_t              efi_nextents;   /* # extents to free */
        __uint64_t              efi_id;         /* efi identifier */
        xfs_extent_32_t         efi_extents[1]; /* array of extents to free */
} __attribute__((packed)) xfs_efi_log_format_32_t;

typedef struct xfs_efi_log_format_64 {
        __uint16_t              efi_type;       /* efi log item type */
        __uint16_t              efi_size;       /* size of this item */
        __uint32_t              efi_nextents;   /* # extents to free */
        __uint64_t              efi_id;         /* efi identifier */
        xfs_extent_64_t         efi_extents[1]; /* array of extents to free */
} xfs_efi_log_format_64_t;

/*
 * This is the structure used to lay out an efd log item in the
 * log.  The efd_extents array is a variable size array whose
 * size is given by efd_nextents;
 */
typedef struct xfs_efd_log_format {
        __uint16_t              efd_type;       /* efd log item type */
        __uint16_t              efd_size;       /* size of this item */
        __uint32_t              efd_nextents;   /* # of extents freed */
        __uint64_t              efd_efi_id;     /* id of corresponding efi */
        xfs_extent_t            efd_extents[1]; /* array of extents freed */
} xfs_efd_log_format_t;

typedef struct xfs_efd_log_format_32 {
        __uint16_t              efd_type;       /* efd log item type */
        __uint16_t              efd_size;       /* size of this item */
        __uint32_t              efd_nextents;   /* # of extents freed */
        __uint64_t              efd_efi_id;     /* id of corresponding efi */
        xfs_extent_32_t         efd_extents[1]; /* array of extents freed */
} __attribute__((packed)) xfs_efd_log_format_32_t;

typedef struct xfs_efd_log_format_64 {
        __uint16_t              efd_type;       /* efd log item type */
        __uint16_t              efd_size;       /* size of this item */
        __uint32_t              efd_nextents;   /* # of extents freed */
        __uint64_t              efd_efi_id;     /* id of corresponding efi */
        xfs_extent_64_t         efd_extents[1]; /* array of extents freed */
} xfs_efd_log_format_64_t;

/*
 * Dquot Log format definitions.
 *
 * The first two fields must be the type and size fitting into
 * 32 bits : log_recovery code assumes that.
 */
typedef struct xfs_dq_logformat {
        __uint16_t              qlf_type;      /* dquot log item type */
        __uint16_t              qlf_size;      /* size of this item */
        xfs_dqid_t              qlf_id;        /* usr/grp/proj id : 32 bits */
        __int64_t               qlf_blkno;     /* blkno of dquot buffer */
        __int32_t               qlf_len;       /* len of dquot buffer */
        __uint32_t              qlf_boffset;   /* off of dquot in buffer */
} xfs_dq_logformat_t;

/*
 * log format struct for QUOTAOFF records.
 * The first two fields must be the type and size fitting into
 * 32 bits : log_recovery code assumes that.
 * We write two LI_QUOTAOFF logitems per quotaoff, the last one keeps a pointer
 * to the first and ensures that the first logitem is taken out of the AIL
 * only when the last one is securely committed.
 */
typedef struct xfs_qoff_logformat {
        unsigned short          qf_type;        /* quotaoff log item type */
        unsigned short          qf_size;        /* size of this item */
        unsigned int            qf_flags;       /* USR and/or GRP */
        char                    qf_pad[12];     /* padding for future */
} xfs_qoff_logformat_t;

/*
 * Disk quotas status in m_qflags, and also sb_qflags. 16 bits.
 */
#define XFS_UQUOTA_ACCT 0x0001  /* user quota accounting ON */
#define XFS_UQUOTA_ENFD 0x0002  /* user quota limits enforced */
#define XFS_UQUOTA_CHKD 0x0004  /* quotacheck run on usr quotas */
#define XFS_PQUOTA_ACCT 0x0008  /* project quota accounting ON */
#define XFS_OQUOTA_ENFD 0x0010  /* other (grp/prj) quota limits enforced */
#define XFS_OQUOTA_CHKD 0x0020  /* quotacheck run on other (grp/prj) quotas */
#define XFS_GQUOTA_ACCT 0x0040  /* group quota accounting ON */

/*
 * Conversion to and from the combined OQUOTA flag (if necessary)
 * is done only in xfs_sb_qflags_to_disk() and xfs_sb_qflags_from_disk()
 */
#define XFS_GQUOTA_ENFD 0x0080  /* group quota limits enforced */
#define XFS_GQUOTA_CHKD 0x0100  /* quotacheck run on group quotas */
#define XFS_PQUOTA_ENFD 0x0200  /* project quota limits enforced */
#define XFS_PQUOTA_CHKD 0x0400  /* quotacheck run on project quotas */

#define XFS_ALL_QUOTA_ACCT      \
                (XFS_UQUOTA_ACCT | XFS_GQUOTA_ACCT | XFS_PQUOTA_ACCT)
#define XFS_ALL_QUOTA_ENFD      \
                (XFS_UQUOTA_ENFD | XFS_GQUOTA_ENFD | XFS_PQUOTA_ENFD)
#define XFS_ALL_QUOTA_CHKD      \
                (XFS_UQUOTA_CHKD | XFS_GQUOTA_CHKD | XFS_PQUOTA_CHKD)

#define XFS_MOUNT_QUOTA_ALL     (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD|\
                                 XFS_UQUOTA_CHKD|XFS_GQUOTA_ACCT|\
                                 XFS_GQUOTA_ENFD|XFS_GQUOTA_CHKD|\
                                 XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD|\
                                 XFS_PQUOTA_CHKD)

/*
 * Inode create log item structure
 *
 * Log recovery assumes the first two entries are the type and size and they fit
 * in 32 bits. Also in host order (ugh) so they have to be 32 bit aligned so
 * decoding can be done correctly.
 */
struct xfs_icreate_log {
        __uint16_t      icl_type;       /* type of log format structure */
        __uint16_t      icl_size;       /* size of log format structure */
        __be32          icl_ag;         /* ag being allocated in */
        __be32          icl_agbno;      /* start block of inode range */
        __be32          icl_count;      /* number of inodes to initialise */
        __be32          icl_isize;      /* size of inodes */
        __be32          icl_length;     /* length of extent to initialise */
        __be32          icl_gen;        /* inode generation number to use */
};

#endif /* __XFS_LOG_FORMAT_H__ */