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alistair23-linux/fs/xfs/xfs_bmap_btree.h
Mandy Kirkconnell 0293ce3a9f [XFS] 929045 567344 This mod introduces multi-level in-core file extent 
functionality, building upon the new layout introduced in mod
xfs-linux:xfs-kern:207390a.  The new multi-level extent allocations are
only required for heavily fragmented files, so the old-style linear extent
list is used on files until the extents reach a pre-determined size of 4k.
4k buffers are used because this is the system page size on Linux i386 and
systems with larger page sizes don't seem to gain much, if anything, by
using their native page size as the extent buffer size. Also, using 4k
extent buffers everywhere provides a consistent interface for CXFS across
different platforms.  The 4k extent buffers are managed by an indirection
array (xfs_ext_irec_t) which is basically just a pointer array with a bit
of extra information to keep track of the number of extents in each buffer
as well as the extent offset of each buffer.  Major changes include:  -
Add multi-level in-core file extent functionality to the xfs_iext_  
subroutines introduced in mod:	xfs-linux:xfs-kern:207390a  - Introduce 13
new subroutines which add functionality for multi-level   in-core file
extents:	 xfs_iext_add_indirect_multi()	      
xfs_iext_remove_indirect()	   xfs_iext_realloc_indirect()	      
xfs_iext_indirect_to_direct()	      xfs_iext_bno_to_irec()	    
xfs_iext_idx_to_irec()	       xfs_iext_irec_init()	   
xfs_iext_irec_new()	    xfs_iext_irec_remove()	  
xfs_iext_irec_compact() 	xfs_iext_irec_compact_pages()	     
xfs_iext_irec_compact_full()	     xfs_iext_irec_update_extoffs()

SGI-PV: 928864
SGI-Modid: xfs-linux-melb:xfs-kern:207393a

Signed-off-by: Mandy Kirkconnell <alkirkco@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>
2006-03-14 13:30:23 +11:00

378 lines
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/*
* 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.
* For 32-bit kernels,
* l0:31 is an extent flag (value 1 indicates non-normal).
* l0:0-30 and l1:9-31 are startoff.
* l1:0-8, l2:0-31, and l3:21-31 are startblock.
* l3:0-20 are blockcount.
* For 64-bit kernels,
* 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.
*/
#ifndef XFS_NATIVE_HOST
#define BMBT_TOTAL_BITLEN 128 /* 128 bits, 16 bytes */
#define BMBT_EXNTFLAG_BITOFF 0
#define BMBT_EXNTFLAG_BITLEN 1
#define BMBT_STARTOFF_BITOFF (BMBT_EXNTFLAG_BITOFF + BMBT_EXNTFLAG_BITLEN)
#define BMBT_STARTOFF_BITLEN 54
#define BMBT_STARTBLOCK_BITOFF (BMBT_STARTOFF_BITOFF + BMBT_STARTOFF_BITLEN)
#define BMBT_STARTBLOCK_BITLEN 52
#define BMBT_BLOCKCOUNT_BITOFF \
(BMBT_STARTBLOCK_BITOFF + BMBT_STARTBLOCK_BITLEN)
#define BMBT_BLOCKCOUNT_BITLEN (BMBT_TOTAL_BITLEN - BMBT_BLOCKCOUNT_BITOFF)
#else
#define BMBT_TOTAL_BITLEN 128 /* 128 bits, 16 bytes */
#define BMBT_EXNTFLAG_BITOFF 63
#define BMBT_EXNTFLAG_BITLEN 1
#define BMBT_STARTOFF_BITOFF (BMBT_EXNTFLAG_BITOFF - BMBT_STARTOFF_BITLEN)
#define BMBT_STARTOFF_BITLEN 54
#define BMBT_STARTBLOCK_BITOFF 85 /* 128 - 43 (other 9 is in first word) */
#define BMBT_STARTBLOCK_BITLEN 52
#define BMBT_BLOCKCOUNT_BITOFF 64 /* Start of second 64 bit container */
#define BMBT_BLOCKCOUNT_BITLEN 21
#endif /* XFS_NATIVE_HOST */
#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
{
__uint64_t 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;
/*
* 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
{
xfs_dfiloff_t br_startoff; /* starting file offset */
} xfs_bmbt_key_t, xfs_bmdr_key_t;
typedef xfs_dfsbno_t xfs_bmbt_ptr_t, xfs_bmdr_ptr_t; /* btree pointer type */
/* 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_IBLOCK_SIZE(lev,cur) (1 << (cur)->bc_blocklog)
#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_DSIZE(lev,cur) \
(((lev) == (cur)->bc_nlevels - 1 ? \
XFS_BMAP_RBLOCK_DSIZE(lev,cur) : XFS_BMAP_IBLOCK_SIZE(lev,cur)))
#define XFS_BMAP_BLOCK_ISIZE(lev,cur) \
(((lev) == (cur)->bc_nlevels - 1 ? \
XFS_BMAP_RBLOCK_ISIZE(lev,cur) : XFS_BMAP_IBLOCK_SIZE(lev,cur)))
#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_BMAP_BLOCK_DSIZE( \
be16_to_cpu((bb)->bb_level), cur), \
xfs_bmbt, bb, i, XFS_BMAP_BLOCK_DMAXRECS( \
be16_to_cpu((bb)->bb_level), cur)))
#define XFS_BMAP_REC_IADDR(bb,i,cur) \
(XFS_BTREE_REC_ADDR(XFS_BMAP_BLOCK_ISIZE( \
be16_to_cpu((bb)->bb_level), cur), \
xfs_bmbt, bb, i, XFS_BMAP_BLOCK_IMAXRECS( \
be16_to_cpu((bb)->bb_level), cur)))
#define XFS_BMAP_KEY_DADDR(bb,i,cur) \
(XFS_BTREE_KEY_ADDR(XFS_BMAP_BLOCK_DSIZE( \
be16_to_cpu((bb)->bb_level), cur), \
xfs_bmbt, bb, i, XFS_BMAP_BLOCK_DMAXRECS( \
be16_to_cpu((bb)->bb_level), cur)))
#define XFS_BMAP_KEY_IADDR(bb,i,cur) \
(XFS_BTREE_KEY_ADDR(XFS_BMAP_BLOCK_ISIZE( \
be16_to_cpu((bb)->bb_level), cur), \
xfs_bmbt, bb, i, XFS_BMAP_BLOCK_IMAXRECS( \
be16_to_cpu((bb)->bb_level), cur)))
#define XFS_BMAP_PTR_DADDR(bb,i,cur) \
(XFS_BTREE_PTR_ADDR(XFS_BMAP_BLOCK_DSIZE( \
be16_to_cpu((bb)->bb_level), cur), \
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_BMAP_BLOCK_ISIZE( \
be16_to_cpu((bb)->bb_level), cur), \
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(sz,xfs_bmbt,bb,i,XFS_BMAP_BROOT_MAXRECS(sz)))
#define XFS_BMAP_BROOT_KEY_ADDR(bb,i,sz) \
(XFS_BTREE_KEY_ADDR(sz,xfs_bmbt,bb,i,XFS_BMAP_BROOT_MAXRECS(sz)))
#define XFS_BMAP_BROOT_PTR_ADDR(bb,i,sz) \
(XFS_BTREE_PTR_ADDR(sz,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_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_t *r);
extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_t *r);
extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_t *r);
extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_t *r);
#ifndef XFS_NATIVE_HOST
extern void xfs_bmbt_disk_get_all(xfs_bmbt_rec_t *r, xfs_bmbt_irec_t *s);
extern xfs_exntst_t xfs_bmbt_disk_get_state(xfs_bmbt_rec_t *r);
extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
extern xfs_fsblock_t xfs_bmbt_disk_get_startblock(xfs_bmbt_rec_t *r);
extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);
#else
#define xfs_bmbt_disk_get_all(r, s) xfs_bmbt_get_all(r, s)
#define xfs_bmbt_disk_get_state(r) xfs_bmbt_get_state(r)
#define xfs_bmbt_disk_get_blockcount(r) xfs_bmbt_get_blockcount(r)
#define xfs_bmbt_disk_get_startblock(r) xfs_bmbt_get_blockcount(r)
#define xfs_bmbt_disk_get_startoff(r) xfs_bmbt_get_startoff(r)
#endif /* XFS_NATIVE_HOST */
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_t *r, xfs_bmbt_irec_t *s);
extern void xfs_bmbt_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_set_blockcount(xfs_bmbt_rec_t *r, xfs_filblks_t v);
extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_t *r, xfs_fsblock_t v);
extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_t *r, xfs_fileoff_t v);
extern void xfs_bmbt_set_state(xfs_bmbt_rec_t *r, xfs_exntst_t v);
#ifndef XFS_NATIVE_HOST
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);
#else
#define xfs_bmbt_disk_set_all(r, s) xfs_bmbt_set_all(r, s)
#define xfs_bmbt_disk_set_allf(r, o, b, c, v) xfs_bmbt_set_allf(r, o, b, c, v)
#endif /* XFS_NATIVE_HOST */
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);
#ifdef DEBUG
/*
* Get the data from the pointed-to record.
*/
extern int xfs_bmbt_get_rec(struct xfs_btree_cur *, xfs_fileoff_t *,
xfs_fsblock_t *, xfs_filblks_t *,
xfs_exntst_t *, int *);
#endif
#endif /* __KERNEL__ */
#endif /* __XFS_BMAP_BTREE_H__ */
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