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root/fs/xfs/xfs_bmap_btree.h

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INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. isnullstartblock
  2. isnulldstartblock
  3. nullstartblock
  4. startblockval

/*
 * Copyright (c) 2000,2002-2005 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_BMAP_BTREE_H__
#define __XFS_BMAP_BTREE_H__

#define XFS_BMAP_MAGIC  0x424d4150      /* 'BMAP' */

struct xfs_btree_cur;
struct xfs_btree_lblock;
struct xfs_mount;
struct xfs_inode;

/*
 * Bmap root header, on-disk form only.
 */
typedef struct xfs_bmdr_block {
        __be16          bb_level;       /* 0 is a leaf */
        __be16          bb_numrecs;     /* current # of data records */
} xfs_bmdr_block_t;

/*
 * Bmap btree record and extent descriptor.
 *  l0:63 is an extent flag (value 1 indicates non-normal).
 *  l0:9-62 are startoff.
 *  l0:0-8 and l1:21-63 are startblock.
 *  l1:0-20 are blockcount.
 */
#define BMBT_EXNTFLAG_BITLEN    1
#define BMBT_STARTOFF_BITLEN    54
#define BMBT_STARTBLOCK_BITLEN  52
#define BMBT_BLOCKCOUNT_BITLEN  21


#define BMBT_USE_64     1

typedef struct xfs_bmbt_rec_32
{
        __uint32_t              l0, l1, l2, l3;
} xfs_bmbt_rec_32_t;
typedef struct xfs_bmbt_rec_64
{
        __be64                  l0, l1;
} xfs_bmbt_rec_64_t;

typedef __uint64_t      xfs_bmbt_rec_base_t;    /* use this for casts */
typedef xfs_bmbt_rec_64_t xfs_bmbt_rec_t, xfs_bmdr_rec_t;

typedef struct xfs_bmbt_rec_host {
        __uint64_t              l0, l1;
} xfs_bmbt_rec_host_t;

/*
 * Values and macros for delayed-allocation startblock fields.
 */
#define STARTBLOCKVALBITS       17
#define STARTBLOCKMASKBITS      (15 + XFS_BIG_BLKNOS * 20)
#define DSTARTBLOCKMASKBITS     (15 + 20)
#define STARTBLOCKMASK          \
        (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
#define DSTARTBLOCKMASK         \
        (((((xfs_dfsbno_t)1) << DSTARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)

#define ISNULLSTARTBLOCK(x)     isnullstartblock(x)
static inline int isnullstartblock(xfs_fsblock_t x)
{
        return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
}

#define ISNULLDSTARTBLOCK(x)    isnulldstartblock(x)
static inline int isnulldstartblock(xfs_dfsbno_t x)
{
        return ((x) & DSTARTBLOCKMASK) == DSTARTBLOCKMASK;
}

#define NULLSTARTBLOCK(k)       nullstartblock(k)
static inline xfs_fsblock_t nullstartblock(int k)
{
        ASSERT(k < (1 << STARTBLOCKVALBITS));
        return STARTBLOCKMASK | (k);
}

#define STARTBLOCKVAL(x)        startblockval(x)
static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
{
        return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
}

/*
 * Possible extent formats.
 */
typedef enum {
        XFS_EXTFMT_NOSTATE = 0,
        XFS_EXTFMT_HASSTATE
} xfs_exntfmt_t;

/*
 * Possible extent states.
 */
typedef enum {
        XFS_EXT_NORM, XFS_EXT_UNWRITTEN,
        XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID
} xfs_exntst_t;

/*
 * Extent state and extent format macros.
 */
#define XFS_EXTFMT_INODE(x)     \
        (xfs_sb_version_hasextflgbit(&((x)->i_mount->m_sb)) ? \
                XFS_EXTFMT_HASSTATE : XFS_EXTFMT_NOSTATE)
#define ISUNWRITTEN(x)  ((x)->br_state == XFS_EXT_UNWRITTEN)

/*
 * Incore version of above.
 */
typedef struct xfs_bmbt_irec
{
        xfs_fileoff_t   br_startoff;    /* starting file offset */
        xfs_fsblock_t   br_startblock;  /* starting block number */
        xfs_filblks_t   br_blockcount;  /* number of blocks */
        xfs_exntst_t    br_state;       /* extent state */
} xfs_bmbt_irec_t;

/*
 * Key structure for non-leaf levels of the tree.
 */
typedef struct xfs_bmbt_key {
        __be64          br_startoff;    /* starting file offset */
} xfs_bmbt_key_t, xfs_bmdr_key_t;

/* btree pointer type */
typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;

/* btree block header type */
typedef struct xfs_btree_lblock xfs_bmbt_block_t;

#define XFS_BUF_TO_BMBT_BLOCK(bp)       ((xfs_bmbt_block_t *)XFS_BUF_PTR(bp))

#define XFS_BMAP_RBLOCK_DSIZE(lev,cur)  ((cur)->bc_private.b.forksize)
#define XFS_BMAP_RBLOCK_ISIZE(lev,cur)  \
        ((int)XFS_IFORK_PTR((cur)->bc_private.b.ip, \
                    (cur)->bc_private.b.whichfork)->if_broot_bytes)

#define XFS_BMAP_BLOCK_DMAXRECS(lev,cur) \
        (((lev) == (cur)->bc_nlevels - 1 ? \
                XFS_BTREE_BLOCK_MAXRECS(XFS_BMAP_RBLOCK_DSIZE(lev,cur), \
                        xfs_bmdr, (lev) == 0) : \
                ((cur)->bc_mp->m_bmap_dmxr[(lev) != 0])))
#define XFS_BMAP_BLOCK_IMAXRECS(lev,cur) \
        (((lev) == (cur)->bc_nlevels - 1 ? \
                        XFS_BTREE_BLOCK_MAXRECS(XFS_BMAP_RBLOCK_ISIZE(lev,cur),\
                                xfs_bmbt, (lev) == 0) : \
                        ((cur)->bc_mp->m_bmap_dmxr[(lev) != 0])))

#define XFS_BMAP_BLOCK_DMINRECS(lev,cur) \
        (((lev) == (cur)->bc_nlevels - 1 ? \
                        XFS_BTREE_BLOCK_MINRECS(XFS_BMAP_RBLOCK_DSIZE(lev,cur),\
                                xfs_bmdr, (lev) == 0) : \
                        ((cur)->bc_mp->m_bmap_dmnr[(lev) != 0])))
#define XFS_BMAP_BLOCK_IMINRECS(lev,cur) \
        (((lev) == (cur)->bc_nlevels - 1 ? \
                        XFS_BTREE_BLOCK_MINRECS(XFS_BMAP_RBLOCK_ISIZE(lev,cur),\
                                xfs_bmbt, (lev) == 0) : \
                        ((cur)->bc_mp->m_bmap_dmnr[(lev) != 0])))

#define XFS_BMAP_REC_DADDR(bb,i,cur)    (XFS_BTREE_REC_ADDR(xfs_bmbt, bb, i))

#define XFS_BMAP_REC_IADDR(bb,i,cur)    (XFS_BTREE_REC_ADDR(xfs_bmbt, bb, i))

#define XFS_BMAP_KEY_DADDR(bb,i,cur)    \
        (XFS_BTREE_KEY_ADDR(xfs_bmbt, bb, i))

#define XFS_BMAP_KEY_IADDR(bb,i,cur)    \
        (XFS_BTREE_KEY_ADDR(xfs_bmbt, bb, i))

#define XFS_BMAP_PTR_DADDR(bb,i,cur)    \
        (XFS_BTREE_PTR_ADDR(xfs_bmbt, bb, i, XFS_BMAP_BLOCK_DMAXRECS(   \
                                be16_to_cpu((bb)->bb_level), cur)))
#define XFS_BMAP_PTR_IADDR(bb,i,cur)    \
        (XFS_BTREE_PTR_ADDR(xfs_bmbt, bb, i, XFS_BMAP_BLOCK_IMAXRECS(   \
                                be16_to_cpu((bb)->bb_level), cur)))

/*
 * These are to be used when we know the size of the block and
 * we don't have a cursor.
 */
#define XFS_BMAP_BROOT_REC_ADDR(bb,i,sz) \
        (XFS_BTREE_REC_ADDR(xfs_bmbt,bb,i))
#define XFS_BMAP_BROOT_KEY_ADDR(bb,i,sz) \
        (XFS_BTREE_KEY_ADDR(xfs_bmbt,bb,i))
#define XFS_BMAP_BROOT_PTR_ADDR(bb,i,sz) \
        (XFS_BTREE_PTR_ADDR(xfs_bmbt,bb,i,XFS_BMAP_BROOT_MAXRECS(sz)))

#define XFS_BMAP_BROOT_NUMRECS(bb)      be16_to_cpu((bb)->bb_numrecs)
#define XFS_BMAP_BROOT_MAXRECS(sz)      XFS_BTREE_BLOCK_MAXRECS(sz,xfs_bmbt,0)

#define XFS_BMAP_BROOT_SPACE_CALC(nrecs) \
        (int)(sizeof(xfs_bmbt_block_t) + \
               ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))

#define XFS_BMAP_BROOT_SPACE(bb) \
        (XFS_BMAP_BROOT_SPACE_CALC(be16_to_cpu((bb)->bb_numrecs)))
#define XFS_BMDR_SPACE_CALC(nrecs) \
        (int)(sizeof(xfs_bmdr_block_t) + \
               ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))

/*
 * Maximum number of bmap btree levels.
 */
#define XFS_BM_MAXLEVELS(mp,w)          ((mp)->m_bm_maxlevels[(w)])

#define XFS_BMAP_SANITY_CHECK(mp,bb,level) \
        (be32_to_cpu((bb)->bb_magic) == XFS_BMAP_MAGIC && \
         be16_to_cpu((bb)->bb_level) == level && \
         be16_to_cpu((bb)->bb_numrecs) > 0 && \
         be16_to_cpu((bb)->bb_numrecs) <= (mp)->m_bmap_dmxr[(level) != 0])


#ifdef __KERNEL__

#if defined(XFS_BMBT_TRACE)
/*
 * Trace buffer entry types.
 */
#define XFS_BMBT_KTRACE_ARGBI   1
#define XFS_BMBT_KTRACE_ARGBII  2
#define XFS_BMBT_KTRACE_ARGFFFI 3
#define XFS_BMBT_KTRACE_ARGI    4
#define XFS_BMBT_KTRACE_ARGIFK  5
#define XFS_BMBT_KTRACE_ARGIFR  6
#define XFS_BMBT_KTRACE_ARGIK   7
#define XFS_BMBT_KTRACE_CUR     8

#define XFS_BMBT_TRACE_SIZE     4096    /* size of global trace buffer */
#define XFS_BMBT_KTRACE_SIZE    32      /* size of per-inode trace buffer */
extern ktrace_t *xfs_bmbt_trace_buf;
#endif

/*
 * Prototypes for xfs_bmap.c to call.
 */
extern void xfs_bmdr_to_bmbt(xfs_bmdr_block_t *, int, xfs_bmbt_block_t *, int);
extern int xfs_bmbt_decrement(struct xfs_btree_cur *, int, int *);
extern int xfs_bmbt_delete(struct xfs_btree_cur *, int *);
extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
extern xfs_bmbt_block_t *xfs_bmbt_get_block(struct xfs_btree_cur *cur,
                                                int, struct xfs_buf **bpp);
extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_host_t *r);
extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_host_t *r);
extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_host_t *r);
extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_host_t *r);

extern void xfs_bmbt_disk_get_all(xfs_bmbt_rec_t *r, xfs_bmbt_irec_t *s);
extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);

extern int xfs_bmbt_increment(struct xfs_btree_cur *, int, int *);
extern int xfs_bmbt_insert(struct xfs_btree_cur *, int *);
extern void xfs_bmbt_log_block(struct xfs_btree_cur *, struct xfs_buf *, int);
extern void xfs_bmbt_log_recs(struct xfs_btree_cur *, struct xfs_buf *, int,
                                int);
extern int xfs_bmbt_lookup_eq(struct xfs_btree_cur *, xfs_fileoff_t,
                                xfs_fsblock_t, xfs_filblks_t, int *);
extern int xfs_bmbt_lookup_ge(struct xfs_btree_cur *, xfs_fileoff_t,
                                xfs_fsblock_t, xfs_filblks_t, int *);

/*
 * Give the bmap btree a new root block.  Copy the old broot contents
 * down into a real block and make the broot point to it.
 */
extern int xfs_bmbt_newroot(struct xfs_btree_cur *cur, int *lflags, int *stat);

extern void xfs_bmbt_set_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
extern void xfs_bmbt_set_allf(xfs_bmbt_rec_host_t *r, xfs_fileoff_t o,
                        xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
extern void xfs_bmbt_set_blockcount(xfs_bmbt_rec_host_t *r, xfs_filblks_t v);
extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_host_t *r, xfs_fsblock_t v);
extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_host_t *r, xfs_fileoff_t v);
extern void xfs_bmbt_set_state(xfs_bmbt_rec_host_t *r, xfs_exntst_t v);

extern void xfs_bmbt_disk_set_all(xfs_bmbt_rec_t *r, xfs_bmbt_irec_t *s);
extern void xfs_bmbt_disk_set_allf(xfs_bmbt_rec_t *r, xfs_fileoff_t o,
                        xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);

extern void xfs_bmbt_to_bmdr(xfs_bmbt_block_t *, int, xfs_bmdr_block_t *, int);
extern int xfs_bmbt_update(struct xfs_btree_cur *, xfs_fileoff_t,
                                xfs_fsblock_t, xfs_filblks_t, xfs_exntst_t);

#endif  /* __KERNEL__ */

#endif  /* __XFS_BMAP_BTREE_H__ */

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