fs/xfs/xfs_bmap_btree.h

   1 /*
   2  * Copyright (c) 2000,2002-2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #ifndef __XFS_BMAP_BTREE_H__
  19 #define __XFS_BMAP_BTREE_H__
  20
  21 #define XFS_BMAP_MAGIC  0x424d4150      /* 'BMAP' */
  22
  23 struct xfs_btree_cur;
  24 struct xfs_btree_lblock;
  25 struct xfs_mount;
  26 struct xfs_inode;
  27
  28 /*
  29  * Bmap root header, on-disk form only.
  30  */
  31 typedef struct xfs_bmdr_block {
  32         __be16          bb_level;       /* 0 is a leaf */
  33         __be16          bb_numrecs;     /* current # of data records */
  34 } xfs_bmdr_block_t;
  35
  36 /*
  37  * Bmap btree record and extent descriptor.
  38  * For 32-bit kernels,
  39  *  l0:31 is an extent flag (value 1 indicates non-normal).
  40  *  l0:0-30 and l1:9-31 are startoff.
  41  *  l1:0-8, l2:0-31, and l3:21-31 are startblock.
  42  *  l3:0-20 are blockcount.
  43  * For 64-bit kernels,
  44  *  l0:63 is an extent flag (value 1 indicates non-normal).
  45  *  l0:9-62 are startoff.
  46  *  l0:0-8 and l1:21-63 are startblock.
  47  *  l1:0-20 are blockcount.
  48  */
  49
  50 #ifndef XFS_NATIVE_HOST
  51
  52 #define BMBT_TOTAL_BITLEN       128     /* 128 bits, 16 bytes */
  53 #define BMBT_EXNTFLAG_BITOFF    0
  54 #define BMBT_EXNTFLAG_BITLEN    1
  55 #define BMBT_STARTOFF_BITOFF    (BMBT_EXNTFLAG_BITOFF + BMBT_EXNTFLAG_BITLEN)
  56 #define BMBT_STARTOFF_BITLEN    54
  57 #define BMBT_STARTBLOCK_BITOFF  (BMBT_STARTOFF_BITOFF + BMBT_STARTOFF_BITLEN)
  58 #define BMBT_STARTBLOCK_BITLEN  52
  59 #define BMBT_BLOCKCOUNT_BITOFF  \
  60         (BMBT_STARTBLOCK_BITOFF + BMBT_STARTBLOCK_BITLEN)
  61 #define BMBT_BLOCKCOUNT_BITLEN  (BMBT_TOTAL_BITLEN - BMBT_BLOCKCOUNT_BITOFF)
  62
  63 #else
  64
  65 #define BMBT_TOTAL_BITLEN       128     /* 128 bits, 16 bytes */
  66 #define BMBT_EXNTFLAG_BITOFF    63
  67 #define BMBT_EXNTFLAG_BITLEN    1
  68 #define BMBT_STARTOFF_BITOFF    (BMBT_EXNTFLAG_BITOFF - BMBT_STARTOFF_BITLEN)
  69 #define BMBT_STARTOFF_BITLEN    54
  70 #define BMBT_STARTBLOCK_BITOFF  85 /* 128 - 43 (other 9 is in first word) */
  71 #define BMBT_STARTBLOCK_BITLEN  52
  72 #define BMBT_BLOCKCOUNT_BITOFF  64 /* Start of second 64 bit container */
  73 #define BMBT_BLOCKCOUNT_BITLEN  21
  74
  75 #endif /* XFS_NATIVE_HOST */
  76
  77
  78 #define BMBT_USE_64     1
  79
  80 typedef struct xfs_bmbt_rec_32
  81 {
  82         __uint32_t              l0, l1, l2, l3;
  83 } xfs_bmbt_rec_32_t;
  84 typedef struct xfs_bmbt_rec_64
  85 {
  86         __uint64_t              l0, l1;
  87 } xfs_bmbt_rec_64_t;
  88
  89 typedef __uint64_t      xfs_bmbt_rec_base_t;    /* use this for casts */
  90 typedef xfs_bmbt_rec_64_t xfs_bmbt_rec_t, xfs_bmdr_rec_t;
  91
  92 /*
  93  * Values and macros for delayed-allocation startblock fields.
  94  */
  95 #define STARTBLOCKVALBITS       17
  96 #define STARTBLOCKMASKBITS      (15 + XFS_BIG_BLKNOS * 20)
  97 #define DSTARTBLOCKMASKBITS     (15 + 20)
  98 #define STARTBLOCKMASK          \
  99         (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
 100 #define DSTARTBLOCKMASK         \
 101         (((((xfs_dfsbno_t)1) << DSTARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
 102
 103 #define ISNULLSTARTBLOCK(x)     isnullstartblock(x)
 104 static inline int isnullstartblock(xfs_fsblock_t x)
 105 {
 106         return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
 107 }
 108
 109 #define ISNULLDSTARTBLOCK(x)    isnulldstartblock(x)
 110 static inline int isnulldstartblock(xfs_dfsbno_t x)
 111 {
 112         return ((x) & DSTARTBLOCKMASK) == DSTARTBLOCKMASK;
 113 }
 114
 115 #define NULLSTARTBLOCK(k)       nullstartblock(k)
 116 static inline xfs_fsblock_t nullstartblock(int k)
 117 {
 118         ASSERT(k < (1 << STARTBLOCKVALBITS));
 119         return STARTBLOCKMASK | (k);
 120 }
 121
 122 #define STARTBLOCKVAL(x)        startblockval(x)
 123 static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
 124 {
 125         return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
 126 }
 127
 128 /*
 129  * Possible extent formats.
 130  */
 131 typedef enum {
 132         XFS_EXTFMT_NOSTATE = 0,
 133         XFS_EXTFMT_HASSTATE
 134 } xfs_exntfmt_t;
 135
 136 /*
 137  * Possible extent states.
 138  */
 139 typedef enum {
 140         XFS_EXT_NORM, XFS_EXT_UNWRITTEN,
 141         XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID
 142 } xfs_exntst_t;
 143
 144 /*
 145  * Extent state and extent format macros.
 146  */
 147 #define XFS_EXTFMT_INODE(x)     \
 148         (XFS_SB_VERSION_HASEXTFLGBIT(&((x)->i_mount->m_sb)) ? \
 149                 XFS_EXTFMT_HASSTATE : XFS_EXTFMT_NOSTATE)
 150 #define ISUNWRITTEN(x)  ((x)->br_state == XFS_EXT_UNWRITTEN)
 151
 152 /*
 153  * Incore version of above.
 154  */
 155 typedef struct xfs_bmbt_irec
 156 {
 157         xfs_fileoff_t   br_startoff;    /* starting file offset */
 158         xfs_fsblock_t   br_startblock;  /* starting block number */
 159         xfs_filblks_t   br_blockcount;  /* number of blocks */
 160         xfs_exntst_t    br_state;       /* extent state */
 161 } xfs_bmbt_irec_t;
 162
 163 /*
 164  * Key structure for non-leaf levels of the tree.
 165  */
 166 typedef struct xfs_bmbt_key {
 167         __be64          br_startoff;    /* starting file offset */
 168 } xfs_bmbt_key_t, xfs_bmdr_key_t;
 169
 170 /* btree pointer type */
 171 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
 172
 173 /* btree block header type */
 174 typedef struct xfs_btree_lblock xfs_bmbt_block_t;
 175
 176 #define XFS_BUF_TO_BMBT_BLOCK(bp)       ((xfs_bmbt_block_t *)XFS_BUF_PTR(bp))
 177
 178 #define XFS_BMAP_RBLOCK_DSIZE(lev,cur)  ((cur)->bc_private.b.forksize)
 179 #define XFS_BMAP_RBLOCK_ISIZE(lev,cur)  \
 180         ((int)XFS_IFORK_PTR((cur)->bc_private.b.ip, \
 181                     (cur)->bc_private.b.whichfork)->if_broot_bytes)
 182
 183 #define XFS_BMAP_BLOCK_DMAXRECS(lev,cur) \
 184         (((lev) == (cur)->bc_nlevels - 1 ? \
 185                 XFS_BTREE_BLOCK_MAXRECS(XFS_BMAP_RBLOCK_DSIZE(lev,cur), \
 186                         xfs_bmdr, (lev) == 0) : \
 187                 ((cur)->bc_mp->m_bmap_dmxr[(lev) != 0])))
 188 #define XFS_BMAP_BLOCK_IMAXRECS(lev,cur) \
 189         (((lev) == (cur)->bc_nlevels - 1 ? \
 190                         XFS_BTREE_BLOCK_MAXRECS(XFS_BMAP_RBLOCK_ISIZE(lev,cur),\
 191                                 xfs_bmbt, (lev) == 0) : \
 192                         ((cur)->bc_mp->m_bmap_dmxr[(lev) != 0])))
 193
 194 #define XFS_BMAP_BLOCK_DMINRECS(lev,cur) \
 195         (((lev) == (cur)->bc_nlevels - 1 ? \
 196                         XFS_BTREE_BLOCK_MINRECS(XFS_BMAP_RBLOCK_DSIZE(lev,cur),\
 197                                 xfs_bmdr, (lev) == 0) : \
 198                         ((cur)->bc_mp->m_bmap_dmnr[(lev) != 0])))
 199 #define XFS_BMAP_BLOCK_IMINRECS(lev,cur) \
 200         (((lev) == (cur)->bc_nlevels - 1 ? \
 201                         XFS_BTREE_BLOCK_MINRECS(XFS_BMAP_RBLOCK_ISIZE(lev,cur),\
 202                                 xfs_bmbt, (lev) == 0) : \
 203                         ((cur)->bc_mp->m_bmap_dmnr[(lev) != 0])))
 204
 205 #define XFS_BMAP_REC_DADDR(bb,i,cur)    (XFS_BTREE_REC_ADDR(xfs_bmbt, bb, i))
 206
 207 #define XFS_BMAP_REC_IADDR(bb,i,cur)    (XFS_BTREE_REC_ADDR(xfs_bmbt, bb, i))
 208
 209 #define XFS_BMAP_KEY_DADDR(bb,i,cur)    \
 210         (XFS_BTREE_KEY_ADDR(xfs_bmbt, bb, i))
 211
 212 #define XFS_BMAP_KEY_IADDR(bb,i,cur)    \
 213         (XFS_BTREE_KEY_ADDR(xfs_bmbt, bb, i))
 214
 215 #define XFS_BMAP_PTR_DADDR(bb,i,cur)    \
 216         (XFS_BTREE_PTR_ADDR(xfs_bmbt, bb, i, XFS_BMAP_BLOCK_DMAXRECS(   \
 217                                 be16_to_cpu((bb)->bb_level), cur)))
 218 #define XFS_BMAP_PTR_IADDR(bb,i,cur)    \
 219         (XFS_BTREE_PTR_ADDR(xfs_bmbt, bb, i, XFS_BMAP_BLOCK_IMAXRECS(   \
 220                                 be16_to_cpu((bb)->bb_level), cur)))
 221
 222 /*
 223  * These are to be used when we know the size of the block and
 224  * we don't have a cursor.
 225  */
 226 #define XFS_BMAP_BROOT_REC_ADDR(bb,i,sz) \
 227         (XFS_BTREE_REC_ADDR(xfs_bmbt,bb,i))
 228 #define XFS_BMAP_BROOT_KEY_ADDR(bb,i,sz) \
 229         (XFS_BTREE_KEY_ADDR(xfs_bmbt,bb,i))
 230 #define XFS_BMAP_BROOT_PTR_ADDR(bb,i,sz) \
 231         (XFS_BTREE_PTR_ADDR(xfs_bmbt,bb,i,XFS_BMAP_BROOT_MAXRECS(sz)))
 232
 233 #define XFS_BMAP_BROOT_NUMRECS(bb)      be16_to_cpu((bb)->bb_numrecs)
 234 #define XFS_BMAP_BROOT_MAXRECS(sz)      XFS_BTREE_BLOCK_MAXRECS(sz,xfs_bmbt,0)
 235
 236 #define XFS_BMAP_BROOT_SPACE_CALC(nrecs) \
 237         (int)(sizeof(xfs_bmbt_block_t) + \
 238                ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
 239
 240 #define XFS_BMAP_BROOT_SPACE(bb) \
 241         (XFS_BMAP_BROOT_SPACE_CALC(be16_to_cpu((bb)->bb_numrecs)))
 242 #define XFS_BMDR_SPACE_CALC(nrecs) \
 243         (int)(sizeof(xfs_bmdr_block_t) + \
 244                ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
 245
 246 /*
 247  * Maximum number of bmap btree levels.
 248  */
 249 #define XFS_BM_MAXLEVELS(mp,w)          ((mp)->m_bm_maxlevels[(w)])
 250
 251 #define XFS_BMAP_SANITY_CHECK(mp,bb,level) \
 252         (be32_to_cpu((bb)->bb_magic) == XFS_BMAP_MAGIC && \
 253          be16_to_cpu((bb)->bb_level) == level && \
 254          be16_to_cpu((bb)->bb_numrecs) > 0 && \
 255          be16_to_cpu((bb)->bb_numrecs) <= (mp)->m_bmap_dmxr[(level) != 0])
 256
 257
 258 #ifdef __KERNEL__
 259
 260 #if defined(XFS_BMBT_TRACE)
 261 /*
 262  * Trace buffer entry types.
 263  */
 264 #define XFS_BMBT_KTRACE_ARGBI   1
 265 #define XFS_BMBT_KTRACE_ARGBII  2
 266 #define XFS_BMBT_KTRACE_ARGFFFI 3
 267 #define XFS_BMBT_KTRACE_ARGI    4
 268 #define XFS_BMBT_KTRACE_ARGIFK  5
 269 #define XFS_BMBT_KTRACE_ARGIFR  6
 270 #define XFS_BMBT_KTRACE_ARGIK   7
 271 #define XFS_BMBT_KTRACE_CUR     8
 272
 273 #define XFS_BMBT_TRACE_SIZE     4096    /* size of global trace buffer */
 274 #define XFS_BMBT_KTRACE_SIZE    32      /* size of per-inode trace buffer */
 275 extern ktrace_t *xfs_bmbt_trace_buf;
 276 #endif
 277
 278 /*
 279  * Prototypes for xfs_bmap.c to call.
 280  */
 281 extern void xfs_bmdr_to_bmbt(xfs_bmdr_block_t *, int, xfs_bmbt_block_t *, int);
 282 extern int xfs_bmbt_decrement(struct xfs_btree_cur *, int, int *);
 283 extern int xfs_bmbt_delete(struct xfs_btree_cur *, int *);
 284 extern void xfs_bmbt_get_all(xfs_bmbt_rec_t *r, xfs_bmbt_irec_t *s);
 285 extern xfs_bmbt_block_t *xfs_bmbt_get_block(struct xfs_btree_cur *cur,
 286                                                 int, struct xfs_buf **bpp);
 287 extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_t *r);
 288 extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_t *r);
 289 extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_t *r);
 290 extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_t *r);
 291
 292 #ifndef XFS_NATIVE_HOST
 293 extern void xfs_bmbt_disk_get_all(xfs_bmbt_rec_t *r, xfs_bmbt_irec_t *s);
 294 extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
 295 extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);
 296 #else
 297 #define xfs_bmbt_disk_get_all(r, s)     xfs_bmbt_get_all(r, s)
 298 #define xfs_bmbt_disk_get_blockcount(r) xfs_bmbt_get_blockcount(r)
 299 #define xfs_bmbt_disk_get_startoff(r)   xfs_bmbt_get_startoff(r)
 300 #endif /* XFS_NATIVE_HOST */
 301
 302 extern int xfs_bmbt_increment(struct xfs_btree_cur *, int, int *);
 303 extern int xfs_bmbt_insert(struct xfs_btree_cur *, int *);
 304 extern void xfs_bmbt_log_block(struct xfs_btree_cur *, struct xfs_buf *, int);
 305 extern void xfs_bmbt_log_recs(struct xfs_btree_cur *, struct xfs_buf *, int,
 306                                 int);
 307 extern int xfs_bmbt_lookup_eq(struct xfs_btree_cur *, xfs_fileoff_t,
 308                                 xfs_fsblock_t, xfs_filblks_t, int *);
 309 extern int xfs_bmbt_lookup_ge(struct xfs_btree_cur *, xfs_fileoff_t,
 310                                 xfs_fsblock_t, xfs_filblks_t, int *);
 311
 312 /*
 313  * Give the bmap btree a new root block.  Copy the old broot contents
 314  * down into a real block and make the broot point to it.
 315  */
 316 extern int xfs_bmbt_newroot(struct xfs_btree_cur *cur, int *lflags, int *stat);
 317
 318 extern void xfs_bmbt_set_all(xfs_bmbt_rec_t *r, xfs_bmbt_irec_t *s);
 319 extern void xfs_bmbt_set_allf(xfs_bmbt_rec_t *r, xfs_fileoff_t o,
 320                         xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
 321 extern void xfs_bmbt_set_blockcount(xfs_bmbt_rec_t *r, xfs_filblks_t v);
 322 extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_t *r, xfs_fsblock_t v);
 323 extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_t *r, xfs_fileoff_t v);
 324 extern void xfs_bmbt_set_state(xfs_bmbt_rec_t *r, xfs_exntst_t v);
 325
 326 #ifndef XFS_NATIVE_HOST
 327 extern void xfs_bmbt_disk_set_all(xfs_bmbt_rec_t *r, xfs_bmbt_irec_t *s);
 328 extern void xfs_bmbt_disk_set_allf(xfs_bmbt_rec_t *r, xfs_fileoff_t o,
 329                         xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
 330 #else
 331 #define xfs_bmbt_disk_set_all(r, s)             xfs_bmbt_set_all(r, s)
 332 #define xfs_bmbt_disk_set_allf(r, o, b, c, v)   xfs_bmbt_set_allf(r, o, b, c, v)
 333 #endif /* XFS_NATIVE_HOST */
 334
 335 extern void xfs_bmbt_to_bmdr(xfs_bmbt_block_t *, int, xfs_bmdr_block_t *, int);
 336 extern int xfs_bmbt_update(struct xfs_btree_cur *, xfs_fileoff_t,
 337                                 xfs_fsblock_t, xfs_filblks_t, xfs_exntst_t);
 338
 339 #endif  /* __KERNEL__ */
 340
 341 #endif  /* __XFS_BMAP_BTREE_H__ */