xfs_extfree_item.h

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/*
 * Copyright (c) 2000,2005 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_EXTFREE_ITEM_H__
#define __XFS_EXTFREE_ITEM_H__

struct xfs_mount;
struct kmem_zone;

typedef struct xfs_extent {
    xfs_dfsbno_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;


#ifdef __KERNEL__

/*
 * Max number of extents in fast allocation path.
 */
#define XFS_EFI_MAX_FAST_EXTENTS    16

/*
 * Define EFI flag bits. Manipulated by set/clear/test_bit operators.
 */
#define XFS_EFI_RECOVERED   1
#define XFS_EFI_COMMITTED   2

/*
 * This is the "extent free intention" log item.  It is used
 * to log the fact that some extents need to be free.  It is
 * used in conjunction with the "extent free done" log item
 * described below.
 */
typedef struct xfs_efi_log_item {
    xfs_log_item_t      efi_item;
    atomic_t        efi_next_extent;
    unsigned long       efi_flags;  /* misc flags */
    xfs_efi_log_format_t    efi_format;
} xfs_efi_log_item_t;

/*
 * This is the "extent free done" log item.  It is used to log
 * the fact that some extents earlier mentioned in an efi item
 * have been freed.
 */
typedef struct xfs_efd_log_item {
    xfs_log_item_t      efd_item;
    xfs_efi_log_item_t  *efd_efip;
    uint            efd_next_extent;
    xfs_efd_log_format_t    efd_format;
} xfs_efd_log_item_t;

/*
 * Max number of extents in fast allocation path.
 */
#define XFS_EFD_MAX_FAST_EXTENTS    16

extern struct kmem_zone *xfs_efi_zone;
extern struct kmem_zone *xfs_efd_zone;

xfs_efi_log_item_t  *xfs_efi_init(struct xfs_mount *, uint);
xfs_efd_log_item_t  *xfs_efd_init(struct xfs_mount *, xfs_efi_log_item_t *,
                      uint);
int         xfs_efi_copy_format(xfs_log_iovec_t *buf,
                        xfs_efi_log_format_t *dst_efi_fmt);
void            xfs_efi_item_free(xfs_efi_log_item_t *);

#endif  /* __KERNEL__ */

#endif  /* __XFS_EXTFREE_ITEM_H__ */