fs/xfs/libxfs/xfs_ag.c

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   4  * Copyright (c) 2018 Red Hat, Inc.
   5  * All rights reserved.
   6  */
   7
   8 #include "xfs.h"
   9 #include "xfs_fs.h"
  10 #include "xfs_shared.h"
  11 #include "xfs_format.h"
  12 #include "xfs_trans_resv.h"
  13 #include "xfs_sb.h"
  14 #include "xfs_mount.h"
  15 #include "xfs_btree.h"
  16 #include "xfs_alloc_btree.h"
  17 #include "xfs_rmap_btree.h"
  18 #include "xfs_alloc.h"
  19 #include "xfs_ialloc.h"
  20 #include "xfs_rmap.h"
  21 #include "xfs_ag.h"
  22
  23 static struct xfs_buf *
  24 xfs_get_aghdr_buf(
  25         struct xfs_mount        *mp,
  26         xfs_daddr_t             blkno,
  27         size_t                  numblks,
  28         int                     flags,
  29         const struct xfs_buf_ops *ops)
  30 {
  31         struct xfs_buf          *bp;
  32
  33         bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
  34         if (!bp)
  35                 return NULL;
  36
  37         xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
  38         bp->b_bn = blkno;
  39         bp->b_maps[0].bm_bn = blkno;
  40         bp->b_ops = ops;
  41
  42         return bp;
  43 }
  44
  45 /*
  46  * Generic btree root block init function
  47  */
  48 static void
  49 xfs_btroot_init(
  50         struct xfs_mount        *mp,
  51         struct xfs_buf          *bp,
  52         struct aghdr_init_data  *id)
  53 {
  54         xfs_btree_init_block(mp, bp, id->type, 0, 0, id->agno, 0);
  55 }
  56
  57 /*
  58  * Alloc btree root block init functions
  59  */
  60 static void
  61 xfs_bnoroot_init(
  62         struct xfs_mount        *mp,
  63         struct xfs_buf          *bp,
  64         struct aghdr_init_data  *id)
  65 {
  66         struct xfs_alloc_rec    *arec;
  67
  68         xfs_btree_init_block(mp, bp, XFS_BTNUM_BNO, 0, 1, id->agno, 0);
  69         arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
  70         arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
  71         arec->ar_blockcount = cpu_to_be32(id->agsize -
  72                                           be32_to_cpu(arec->ar_startblock));
  73 }
  74
  75 static void
  76 xfs_cntroot_init(
  77         struct xfs_mount        *mp,
  78         struct xfs_buf          *bp,
  79         struct aghdr_init_data  *id)
  80 {
  81         struct xfs_alloc_rec    *arec;
  82
  83         xfs_btree_init_block(mp, bp, XFS_BTNUM_CNT, 0, 1, id->agno, 0);
  84         arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
  85         arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
  86         arec->ar_blockcount = cpu_to_be32(id->agsize -
  87                                           be32_to_cpu(arec->ar_startblock));
  88 }
  89
  90 /*
  91  * Reverse map root block init
  92  */
  93 static void
  94 xfs_rmaproot_init(
  95         struct xfs_mount        *mp,
  96         struct xfs_buf          *bp,
  97         struct aghdr_init_data  *id)
  98 {
  99         struct xfs_btree_block  *block = XFS_BUF_TO_BLOCK(bp);
 100         struct xfs_rmap_rec     *rrec;
 101
 102         xfs_btree_init_block(mp, bp, XFS_BTNUM_RMAP, 0, 4, id->agno, 0);
 103
 104         /*
 105          * mark the AG header regions as static metadata The BNO
 106          * btree block is the first block after the headers, so
 107          * it's location defines the size of region the static
 108          * metadata consumes.
 109          *
 110          * Note: unlike mkfs, we never have to account for log
 111          * space when growing the data regions
 112          */
 113         rrec = XFS_RMAP_REC_ADDR(block, 1);
 114         rrec->rm_startblock = 0;
 115         rrec->rm_blockcount = cpu_to_be32(XFS_BNO_BLOCK(mp));
 116         rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_FS);
 117         rrec->rm_offset = 0;
 118
 119         /* account freespace btree root blocks */
 120         rrec = XFS_RMAP_REC_ADDR(block, 2);
 121         rrec->rm_startblock = cpu_to_be32(XFS_BNO_BLOCK(mp));
 122         rrec->rm_blockcount = cpu_to_be32(2);
 123         rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
 124         rrec->rm_offset = 0;
 125
 126         /* account inode btree root blocks */
 127         rrec = XFS_RMAP_REC_ADDR(block, 3);
 128         rrec->rm_startblock = cpu_to_be32(XFS_IBT_BLOCK(mp));
 129         rrec->rm_blockcount = cpu_to_be32(XFS_RMAP_BLOCK(mp) -
 130                                           XFS_IBT_BLOCK(mp));
 131         rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_INOBT);
 132         rrec->rm_offset = 0;
 133
 134         /* account for rmap btree root */
 135         rrec = XFS_RMAP_REC_ADDR(block, 4);
 136         rrec->rm_startblock = cpu_to_be32(XFS_RMAP_BLOCK(mp));
 137         rrec->rm_blockcount = cpu_to_be32(1);
 138         rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
 139         rrec->rm_offset = 0;
 140
 141         /* account for refc btree root */
 142         if (xfs_sb_version_hasreflink(&mp->m_sb)) {
 143                 rrec = XFS_RMAP_REC_ADDR(block, 5);
 144                 rrec->rm_startblock = cpu_to_be32(xfs_refc_block(mp));
 145                 rrec->rm_blockcount = cpu_to_be32(1);
 146                 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_REFC);
 147                 rrec->rm_offset = 0;
 148                 be16_add_cpu(&block->bb_numrecs, 1);
 149         }
 150 }
 151
 152 /*
 153  * Initialise new secondary superblocks with the pre-grow geometry, but mark
 154  * them as "in progress" so we know they haven't yet been activated. This will
 155  * get cleared when the update with the new geometry information is done after
 156  * changes to the primary are committed. This isn't strictly necessary, but we
 157  * get it for free with the delayed buffer write lists and it means we can tell
 158  * if a grow operation didn't complete properly after the fact.
 159  */
 160 static void
 161 xfs_sbblock_init(
 162         struct xfs_mount        *mp,
 163         struct xfs_buf          *bp,
 164         struct aghdr_init_data  *id)
 165 {
 166         struct xfs_dsb          *dsb = XFS_BUF_TO_SBP(bp);
 167
 168         xfs_sb_to_disk(dsb, &mp->m_sb);
 169         dsb->sb_inprogress = 1;
 170 }
 171
 172 static void
 173 xfs_agfblock_init(
 174         struct xfs_mount        *mp,
 175         struct xfs_buf          *bp,
 176         struct aghdr_init_data  *id)
 177 {
 178         struct xfs_agf          *agf = XFS_BUF_TO_AGF(bp);
 179         xfs_extlen_t            tmpsize;
 180
 181         agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
 182         agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
 183         agf->agf_seqno = cpu_to_be32(id->agno);
 184         agf->agf_length = cpu_to_be32(id->agsize);
 185         agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
 186         agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
 187         agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
 188         agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
 189         if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
 190                 agf->agf_roots[XFS_BTNUM_RMAPi] =
 191                                         cpu_to_be32(XFS_RMAP_BLOCK(mp));
 192                 agf->agf_levels[XFS_BTNUM_RMAPi] = cpu_to_be32(1);
 193                 agf->agf_rmap_blocks = cpu_to_be32(1);
 194         }
 195
 196         agf->agf_flfirst = cpu_to_be32(1);
 197         agf->agf_fllast = 0;
 198         agf->agf_flcount = 0;
 199         tmpsize = id->agsize - mp->m_ag_prealloc_blocks;
 200         agf->agf_freeblks = cpu_to_be32(tmpsize);
 201         agf->agf_longest = cpu_to_be32(tmpsize);
 202         if (xfs_sb_version_hascrc(&mp->m_sb))
 203                 uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid);
 204         if (xfs_sb_version_hasreflink(&mp->m_sb)) {
 205                 agf->agf_refcount_root = cpu_to_be32(
 206                                 xfs_refc_block(mp));
 207                 agf->agf_refcount_level = cpu_to_be32(1);
 208                 agf->agf_refcount_blocks = cpu_to_be32(1);
 209         }
 210 }
 211
 212 static void
 213 xfs_agflblock_init(
 214         struct xfs_mount        *mp,
 215         struct xfs_buf          *bp,
 216         struct aghdr_init_data  *id)
 217 {
 218         struct xfs_agfl         *agfl = XFS_BUF_TO_AGFL(bp);
 219         __be32                  *agfl_bno;
 220         int                     bucket;
 221
 222         if (xfs_sb_version_hascrc(&mp->m_sb)) {
 223                 agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
 224                 agfl->agfl_seqno = cpu_to_be32(id->agno);
 225                 uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid);
 226         }
 227
 228         agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
 229         for (bucket = 0; bucket < xfs_agfl_size(mp); bucket++)
 230                 agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
 231 }
 232
 233 static void
 234 xfs_agiblock_init(
 235         struct xfs_mount        *mp,
 236         struct xfs_buf          *bp,
 237         struct aghdr_init_data  *id)
 238 {
 239         struct xfs_agi          *agi = XFS_BUF_TO_AGI(bp);
 240         int                     bucket;
 241
 242         agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
 243         agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
 244         agi->agi_seqno = cpu_to_be32(id->agno);
 245         agi->agi_length = cpu_to_be32(id->agsize);
 246         agi->agi_count = 0;
 247         agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
 248         agi->agi_level = cpu_to_be32(1);
 249         agi->agi_freecount = 0;
 250         agi->agi_newino = cpu_to_be32(NULLAGINO);
 251         agi->agi_dirino = cpu_to_be32(NULLAGINO);
 252         if (xfs_sb_version_hascrc(&mp->m_sb))
 253                 uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid);
 254         if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
 255                 agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp));
 256                 agi->agi_free_level = cpu_to_be32(1);
 257         }
 258         for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
 259                 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
 260 }
 261
 262 typedef void (*aghdr_init_work_f)(struct xfs_mount *mp, struct xfs_buf *bp,
 263                                   struct aghdr_init_data *id);
 264 static int
 265 xfs_ag_init_hdr(
 266         struct xfs_mount        *mp,
 267         struct aghdr_init_data  *id,
 268         aghdr_init_work_f       work,
 269         const struct xfs_buf_ops *ops)
 270
 271 {
 272         struct xfs_buf          *bp;
 273
 274         bp = xfs_get_aghdr_buf(mp, id->daddr, id->numblks, 0, ops);
 275         if (!bp)
 276                 return -ENOMEM;
 277
 278         (*work)(mp, bp, id);
 279
 280         xfs_buf_delwri_queue(bp, &id->buffer_list);
 281         xfs_buf_relse(bp);
 282         return 0;
 283 }
 284
 285 struct xfs_aghdr_grow_data {
 286         xfs_daddr_t             daddr;
 287         size_t                  numblks;
 288         const struct xfs_buf_ops *ops;
 289         aghdr_init_work_f       work;
 290         xfs_btnum_t             type;
 291         bool                    need_init;
 292 };
 293
 294 /*
 295  * Prepare new AG headers to be written to disk. We use uncached buffers here,
 296  * as it is assumed these new AG headers are currently beyond the currently
 297  * valid filesystem address space. Using cached buffers would trip over EOFS
 298  * corruption detection alogrithms in the buffer cache lookup routines.
 299  *
 300  * This is a non-transactional function, but the prepared buffers are added to a
 301  * delayed write buffer list supplied by the caller so they can submit them to
 302  * disk and wait on them as required.
 303  */
 304 int
 305 xfs_ag_init_headers(
 306         struct xfs_mount        *mp,
 307         struct aghdr_init_data  *id)
 308
 309 {
 310         struct xfs_aghdr_grow_data aghdr_data[] = {
 311         { /* SB */
 312                 .daddr = XFS_AG_DADDR(mp, id->agno, XFS_SB_DADDR),
 313                 .numblks = XFS_FSS_TO_BB(mp, 1),
 314                 .ops = &xfs_sb_buf_ops,
 315                 .work = &xfs_sbblock_init,
 316                 .need_init = true
 317         },
 318         { /* AGF */
 319                 .daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGF_DADDR(mp)),
 320                 .numblks = XFS_FSS_TO_BB(mp, 1),
 321                 .ops = &xfs_agf_buf_ops,
 322                 .work = &xfs_agfblock_init,
 323                 .need_init = true
 324         },
 325         { /* AGFL */
 326                 .daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGFL_DADDR(mp)),
 327                 .numblks = XFS_FSS_TO_BB(mp, 1),
 328                 .ops = &xfs_agfl_buf_ops,
 329                 .work = &xfs_agflblock_init,
 330                 .need_init = true
 331         },
 332         { /* AGI */
 333                 .daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGI_DADDR(mp)),
 334                 .numblks = XFS_FSS_TO_BB(mp, 1),
 335                 .ops = &xfs_agi_buf_ops,
 336                 .work = &xfs_agiblock_init,
 337                 .need_init = true
 338         },
 339         { /* BNO root block */
 340                 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_BNO_BLOCK(mp)),
 341                 .numblks = BTOBB(mp->m_sb.sb_blocksize),
 342                 .ops = &xfs_allocbt_buf_ops,
 343                 .work = &xfs_bnoroot_init,
 344                 .need_init = true
 345         },
 346         { /* CNT root block */
 347                 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_CNT_BLOCK(mp)),
 348                 .numblks = BTOBB(mp->m_sb.sb_blocksize),
 349                 .ops = &xfs_allocbt_buf_ops,
 350                 .work = &xfs_cntroot_init,
 351                 .need_init = true
 352         },
 353         { /* INO root block */
 354                 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_IBT_BLOCK(mp)),
 355                 .numblks = BTOBB(mp->m_sb.sb_blocksize),
 356                 .ops = &xfs_inobt_buf_ops,
 357                 .work = &xfs_btroot_init,
 358                 .type = XFS_BTNUM_INO,
 359                 .need_init = true
 360         },
 361         { /* FINO root block */
 362                 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_FIBT_BLOCK(mp)),
 363                 .numblks = BTOBB(mp->m_sb.sb_blocksize),
 364                 .ops = &xfs_inobt_buf_ops,
 365                 .work = &xfs_btroot_init,
 366                 .type = XFS_BTNUM_FINO,
 367                 .need_init =  xfs_sb_version_hasfinobt(&mp->m_sb)
 368         },
 369         { /* RMAP root block */
 370                 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_RMAP_BLOCK(mp)),
 371                 .numblks = BTOBB(mp->m_sb.sb_blocksize),
 372                 .ops = &xfs_rmapbt_buf_ops,
 373                 .work = &xfs_rmaproot_init,
 374                 .need_init = xfs_sb_version_hasrmapbt(&mp->m_sb)
 375         },
 376         { /* REFC root block */
 377                 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, xfs_refc_block(mp)),
 378                 .numblks = BTOBB(mp->m_sb.sb_blocksize),
 379                 .ops = &xfs_refcountbt_buf_ops,
 380                 .work = &xfs_btroot_init,
 381                 .type = XFS_BTNUM_REFC,
 382                 .need_init = xfs_sb_version_hasreflink(&mp->m_sb)
 383         },
 384         { /* NULL terminating block */
 385                 .daddr = XFS_BUF_DADDR_NULL,
 386         }
 387         };
 388         struct  xfs_aghdr_grow_data *dp;
 389         int                     error = 0;
 390
 391         /* Account for AG free space in new AG */
 392         id->nfree += id->agsize - mp->m_ag_prealloc_blocks;
 393         for (dp = &aghdr_data[0]; dp->daddr != XFS_BUF_DADDR_NULL; dp++) {
 394                 if (!dp->need_init)
 395                         continue;
 396
 397                 id->daddr = dp->daddr;
 398                 id->numblks = dp->numblks;
 399                 id->type = dp->type;
 400                 error = xfs_ag_init_hdr(mp, id, dp->work, dp->ops);
 401                 if (error)
 402                         break;
 403         }
 404         return error;
 405 }
 406
 407 /*
 408  * Extent the AG indicated by the @id by the length passed in
 409  */
 410 int
 411 xfs_ag_extend_space(
 412         struct xfs_mount        *mp,
 413         struct xfs_trans        *tp,
 414         struct aghdr_init_data  *id,
 415         xfs_extlen_t            len)
 416 {
 417         struct xfs_owner_info   oinfo;
 418         struct xfs_buf          *bp;
 419         struct xfs_agi          *agi;
 420         struct xfs_agf          *agf;
 421         int                     error;
 422
 423         /*
 424          * Change the agi length.
 425          */
 426         error = xfs_ialloc_read_agi(mp, tp, id->agno, &bp);
 427         if (error)
 428                 return error;
 429
 430         agi = XFS_BUF_TO_AGI(bp);
 431         be32_add_cpu(&agi->agi_length, len);
 432         ASSERT(id->agno == mp->m_sb.sb_agcount - 1 ||
 433                be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
 434         xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
 435
 436         /*
 437          * Change agf length.
 438          */
 439         error = xfs_alloc_read_agf(mp, tp, id->agno, 0, &bp);
 440         if (error)
 441                 return error;
 442
 443         agf = XFS_BUF_TO_AGF(bp);
 444         be32_add_cpu(&agf->agf_length, len);
 445         ASSERT(agf->agf_length == agi->agi_length);
 446         xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
 447
 448         /*
 449          * Free the new space.
 450          *
 451          * XFS_RMAP_OWN_NULL is used here to tell the rmap btree that
 452          * this doesn't actually exist in the rmap btree.
 453          */
 454         xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_NULL);
 455         error = xfs_rmap_free(tp, bp, id->agno,
 456                                 be32_to_cpu(agf->agf_length) - len,
 457                                 len, &oinfo);
 458         if (error)
 459                 return error;
 460
 461         return  xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, id->agno,
 462                                         be32_to_cpu(agf->agf_length) - len),
 463                                 len, &oinfo, XFS_AG_RESV_NONE);
 464 }