fs/nilfs2/sufile.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * NILFS segment usage file.
   4  *
   5  * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
   6  *
   7  * Written by Koji Sato.
   8  * Revised by Ryusuke Konishi.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/fs.h>
  13 #include <linux/string.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/errno.h>
  16 #include "mdt.h"
  17 #include "sufile.h"
  18
  19 #include <trace/events/nilfs2.h>
  20
  21 /**
  22  * struct nilfs_sufile_info - on-memory private data of sufile
  23  * @mi: on-memory private data of metadata file
  24  * @ncleansegs: number of clean segments
  25  * @allocmin: lower limit of allocatable segment range
  26  * @allocmax: upper limit of allocatable segment range
  27  */
  28 struct nilfs_sufile_info {
  29         struct nilfs_mdt_info mi;
  30         unsigned long ncleansegs;/* number of clean segments */
  31         __u64 allocmin;         /* lower limit of allocatable segment range */
  32         __u64 allocmax;         /* upper limit of allocatable segment range */
  33 };
  34
  35 static inline struct nilfs_sufile_info *NILFS_SUI(struct inode *sufile)
  36 {
  37         return (struct nilfs_sufile_info *)NILFS_MDT(sufile);
  38 }
  39
  40 static inline unsigned long
  41 nilfs_sufile_segment_usages_per_block(const struct inode *sufile)
  42 {
  43         return NILFS_MDT(sufile)->mi_entries_per_block;
  44 }
  45
  46 static unsigned long
  47 nilfs_sufile_get_blkoff(const struct inode *sufile, __u64 segnum)
  48 {
  49         __u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset;
  50
  51         do_div(t, nilfs_sufile_segment_usages_per_block(sufile));
  52         return (unsigned long)t;
  53 }
  54
  55 static unsigned long
  56 nilfs_sufile_get_offset(const struct inode *sufile, __u64 segnum)
  57 {
  58         __u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset;
  59
  60         return do_div(t, nilfs_sufile_segment_usages_per_block(sufile));
  61 }
  62
  63 static unsigned long
  64 nilfs_sufile_segment_usages_in_block(const struct inode *sufile, __u64 curr,
  65                                      __u64 max)
  66 {
  67         return min_t(unsigned long,
  68                      nilfs_sufile_segment_usages_per_block(sufile) -
  69                      nilfs_sufile_get_offset(sufile, curr),
  70                      max - curr + 1);
  71 }
  72
  73 static struct nilfs_segment_usage *
  74 nilfs_sufile_block_get_segment_usage(const struct inode *sufile, __u64 segnum,
  75                                      struct buffer_head *bh, void *kaddr)
  76 {
  77         return kaddr + bh_offset(bh) +
  78                 nilfs_sufile_get_offset(sufile, segnum) *
  79                 NILFS_MDT(sufile)->mi_entry_size;
  80 }
  81
  82 static inline int nilfs_sufile_get_header_block(struct inode *sufile,
  83                                                 struct buffer_head **bhp)
  84 {
  85         return nilfs_mdt_get_block(sufile, 0, 0, NULL, bhp);
  86 }
  87
  88 static inline int
  89 nilfs_sufile_get_segment_usage_block(struct inode *sufile, __u64 segnum,
  90                                      int create, struct buffer_head **bhp)
  91 {
  92         return nilfs_mdt_get_block(sufile,
  93                                    nilfs_sufile_get_blkoff(sufile, segnum),
  94                                    create, NULL, bhp);
  95 }
  96
  97 static int nilfs_sufile_delete_segment_usage_block(struct inode *sufile,
  98                                                    __u64 segnum)
  99 {
 100         return nilfs_mdt_delete_block(sufile,
 101                                       nilfs_sufile_get_blkoff(sufile, segnum));
 102 }
 103
 104 static void nilfs_sufile_mod_counter(struct buffer_head *header_bh,
 105                                      u64 ncleanadd, u64 ndirtyadd)
 106 {
 107         struct nilfs_sufile_header *header;
 108         void *kaddr;
 109
 110         kaddr = kmap_atomic(header_bh->b_page);
 111         header = kaddr + bh_offset(header_bh);
 112         le64_add_cpu(&header->sh_ncleansegs, ncleanadd);
 113         le64_add_cpu(&header->sh_ndirtysegs, ndirtyadd);
 114         kunmap_atomic(kaddr);
 115
 116         mark_buffer_dirty(header_bh);
 117 }
 118
 119 /**
 120  * nilfs_sufile_get_ncleansegs - return the number of clean segments
 121  * @sufile: inode of segment usage file
 122  */
 123 unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile)
 124 {
 125         return NILFS_SUI(sufile)->ncleansegs;
 126 }
 127
 128 /**
 129  * nilfs_sufile_updatev - modify multiple segment usages at a time
 130  * @sufile: inode of segment usage file
 131  * @segnumv: array of segment numbers
 132  * @nsegs: size of @segnumv array
 133  * @create: creation flag
 134  * @ndone: place to store number of modified segments on @segnumv
 135  * @dofunc: primitive operation for the update
 136  *
 137  * Description: nilfs_sufile_updatev() repeatedly calls @dofunc
 138  * against the given array of segments.  The @dofunc is called with
 139  * buffers of a header block and the sufile block in which the target
 140  * segment usage entry is contained.  If @ndone is given, the number
 141  * of successfully modified segments from the head is stored in the
 142  * place @ndone points to.
 143  *
 144  * Return Value: On success, zero is returned.  On error, one of the
 145  * following negative error codes is returned.
 146  *
 147  * %-EIO - I/O error.
 148  *
 149  * %-ENOMEM - Insufficient amount of memory available.
 150  *
 151  * %-ENOENT - Given segment usage is in hole block (may be returned if
 152  *            @create is zero)
 153  *
 154  * %-EINVAL - Invalid segment usage number
 155  */
 156 int nilfs_sufile_updatev(struct inode *sufile, __u64 *segnumv, size_t nsegs,
 157                          int create, size_t *ndone,
 158                          void (*dofunc)(struct inode *, __u64,
 159                                         struct buffer_head *,
 160                                         struct buffer_head *))
 161 {
 162         struct buffer_head *header_bh, *bh;
 163         unsigned long blkoff, prev_blkoff;
 164         __u64 *seg;
 165         size_t nerr = 0, n = 0;
 166         int ret = 0;
 167
 168         if (unlikely(nsegs == 0))
 169                 goto out;
 170
 171         down_write(&NILFS_MDT(sufile)->mi_sem);
 172         for (seg = segnumv; seg < segnumv + nsegs; seg++) {
 173                 if (unlikely(*seg >= nilfs_sufile_get_nsegments(sufile))) {
 174                         nilfs_warn(sufile->i_sb,
 175                                    "%s: invalid segment number: %llu",
 176                                    __func__, (unsigned long long)*seg);
 177                         nerr++;
 178                 }
 179         }
 180         if (nerr > 0) {
 181                 ret = -EINVAL;
 182                 goto out_sem;
 183         }
 184
 185         ret = nilfs_sufile_get_header_block(sufile, &header_bh);
 186         if (ret < 0)
 187                 goto out_sem;
 188
 189         seg = segnumv;
 190         blkoff = nilfs_sufile_get_blkoff(sufile, *seg);
 191         ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh);
 192         if (ret < 0)
 193                 goto out_header;
 194
 195         for (;;) {
 196                 dofunc(sufile, *seg, header_bh, bh);
 197
 198                 if (++seg >= segnumv + nsegs)
 199                         break;
 200                 prev_blkoff = blkoff;
 201                 blkoff = nilfs_sufile_get_blkoff(sufile, *seg);
 202                 if (blkoff == prev_blkoff)
 203                         continue;
 204
 205                 /* get different block */
 206                 brelse(bh);
 207                 ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh);
 208                 if (unlikely(ret < 0))
 209                         goto out_header;
 210         }
 211         brelse(bh);
 212
 213  out_header:
 214         n = seg - segnumv;
 215         brelse(header_bh);
 216  out_sem:
 217         up_write(&NILFS_MDT(sufile)->mi_sem);
 218  out:
 219         if (ndone)
 220                 *ndone = n;
 221         return ret;
 222 }
 223
 224 int nilfs_sufile_update(struct inode *sufile, __u64 segnum, int create,
 225                         void (*dofunc)(struct inode *, __u64,
 226                                        struct buffer_head *,
 227                                        struct buffer_head *))
 228 {
 229         struct buffer_head *header_bh, *bh;
 230         int ret;
 231
 232         if (unlikely(segnum >= nilfs_sufile_get_nsegments(sufile))) {
 233                 nilfs_warn(sufile->i_sb, "%s: invalid segment number: %llu",
 234                            __func__, (unsigned long long)segnum);
 235                 return -EINVAL;
 236         }
 237         down_write(&NILFS_MDT(sufile)->mi_sem);
 238
 239         ret = nilfs_sufile_get_header_block(sufile, &header_bh);
 240         if (ret < 0)
 241                 goto out_sem;
 242
 243         ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, create, &bh);
 244         if (!ret) {
 245                 dofunc(sufile, segnum, header_bh, bh);
 246                 brelse(bh);
 247         }
 248         brelse(header_bh);
 249
 250  out_sem:
 251         up_write(&NILFS_MDT(sufile)->mi_sem);
 252         return ret;
 253 }
 254
 255 /**
 256  * nilfs_sufile_set_alloc_range - limit range of segment to be allocated
 257  * @sufile: inode of segment usage file
 258  * @start: minimum segment number of allocatable region (inclusive)
 259  * @end: maximum segment number of allocatable region (inclusive)
 260  *
 261  * Return Value: On success, 0 is returned.  On error, one of the
 262  * following negative error codes is returned.
 263  *
 264  * %-ERANGE - invalid segment region
 265  */
 266 int nilfs_sufile_set_alloc_range(struct inode *sufile, __u64 start, __u64 end)
 267 {
 268         struct nilfs_sufile_info *sui = NILFS_SUI(sufile);
 269         __u64 nsegs;
 270         int ret = -ERANGE;
 271
 272         down_write(&NILFS_MDT(sufile)->mi_sem);
 273         nsegs = nilfs_sufile_get_nsegments(sufile);
 274
 275         if (start <= end && end < nsegs) {
 276                 sui->allocmin = start;
 277                 sui->allocmax = end;
 278                 ret = 0;
 279         }
 280         up_write(&NILFS_MDT(sufile)->mi_sem);
 281         return ret;
 282 }
 283
 284 /**
 285  * nilfs_sufile_alloc - allocate a segment
 286  * @sufile: inode of segment usage file
 287  * @segnump: pointer to segment number
 288  *
 289  * Description: nilfs_sufile_alloc() allocates a clean segment.
 290  *
 291  * Return Value: On success, 0 is returned and the segment number of the
 292  * allocated segment is stored in the place pointed by @segnump. On error, one
 293  * of the following negative error codes is returned.
 294  *
 295  * %-EIO - I/O error.
 296  *
 297  * %-ENOMEM - Insufficient amount of memory available.
 298  *
 299  * %-ENOSPC - No clean segment left.
 300  */
 301 int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump)
 302 {
 303         struct buffer_head *header_bh, *su_bh;
 304         struct nilfs_sufile_header *header;
 305         struct nilfs_segment_usage *su;
 306         struct nilfs_sufile_info *sui = NILFS_SUI(sufile);
 307         size_t susz = NILFS_MDT(sufile)->mi_entry_size;
 308         __u64 segnum, maxsegnum, last_alloc;
 309         void *kaddr;
 310         unsigned long nsegments, nsus, cnt;
 311         int ret, j;
 312
 313         down_write(&NILFS_MDT(sufile)->mi_sem);
 314
 315         ret = nilfs_sufile_get_header_block(sufile, &header_bh);
 316         if (ret < 0)
 317                 goto out_sem;
 318         kaddr = kmap_atomic(header_bh->b_page);
 319         header = kaddr + bh_offset(header_bh);
 320         last_alloc = le64_to_cpu(header->sh_last_alloc);
 321         kunmap_atomic(kaddr);
 322
 323         nsegments = nilfs_sufile_get_nsegments(sufile);
 324         maxsegnum = sui->allocmax;
 325         segnum = last_alloc + 1;
 326         if (segnum < sui->allocmin || segnum > sui->allocmax)
 327                 segnum = sui->allocmin;
 328
 329         for (cnt = 0; cnt < nsegments; cnt += nsus) {
 330                 if (segnum > maxsegnum) {
 331                         if (cnt < sui->allocmax - sui->allocmin + 1) {
 332                                 /*
 333                                  * wrap around in the limited region.
 334                                  * if allocation started from
 335                                  * sui->allocmin, this never happens.
 336                                  */
 337                                 segnum = sui->allocmin;
 338                                 maxsegnum = last_alloc;
 339                         } else if (segnum > sui->allocmin &&
 340                                    sui->allocmax + 1 < nsegments) {
 341                                 segnum = sui->allocmax + 1;
 342                                 maxsegnum = nsegments - 1;
 343                         } else if (sui->allocmin > 0)  {
 344                                 segnum = 0;
 345                                 maxsegnum = sui->allocmin - 1;
 346                         } else {
 347                                 break; /* never happens */
 348                         }
 349                 }
 350                 trace_nilfs2_segment_usage_check(sufile, segnum, cnt);
 351                 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 1,
 352                                                            &su_bh);
 353                 if (ret < 0)
 354                         goto out_header;
 355                 kaddr = kmap_atomic(su_bh->b_page);
 356                 su = nilfs_sufile_block_get_segment_usage(
 357                         sufile, segnum, su_bh, kaddr);
 358
 359                 nsus = nilfs_sufile_segment_usages_in_block(
 360                         sufile, segnum, maxsegnum);
 361                 for (j = 0; j < nsus; j++, su = (void *)su + susz, segnum++) {
 362                         if (!nilfs_segment_usage_clean(su))
 363                                 continue;
 364                         /* found a clean segment */
 365                         nilfs_segment_usage_set_dirty(su);
 366                         kunmap_atomic(kaddr);
 367
 368                         kaddr = kmap_atomic(header_bh->b_page);
 369                         header = kaddr + bh_offset(header_bh);
 370                         le64_add_cpu(&header->sh_ncleansegs, -1);
 371                         le64_add_cpu(&header->sh_ndirtysegs, 1);
 372                         header->sh_last_alloc = cpu_to_le64(segnum);
 373                         kunmap_atomic(kaddr);
 374
 375                         sui->ncleansegs--;
 376                         mark_buffer_dirty(header_bh);
 377                         mark_buffer_dirty(su_bh);
 378                         nilfs_mdt_mark_dirty(sufile);
 379                         brelse(su_bh);
 380                         *segnump = segnum;
 381
 382                         trace_nilfs2_segment_usage_allocated(sufile, segnum);
 383
 384                         goto out_header;
 385                 }
 386
 387                 kunmap_atomic(kaddr);
 388                 brelse(su_bh);
 389         }
 390
 391         /* no segments left */
 392         ret = -ENOSPC;
 393
 394  out_header:
 395         brelse(header_bh);
 396
 397  out_sem:
 398         up_write(&NILFS_MDT(sufile)->mi_sem);
 399         return ret;
 400 }
 401
 402 void nilfs_sufile_do_cancel_free(struct inode *sufile, __u64 segnum,
 403                                  struct buffer_head *header_bh,
 404                                  struct buffer_head *su_bh)
 405 {
 406         struct nilfs_segment_usage *su;
 407         void *kaddr;
 408
 409         kaddr = kmap_atomic(su_bh->b_page);
 410         su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
 411         if (unlikely(!nilfs_segment_usage_clean(su))) {
 412                 nilfs_warn(sufile->i_sb, "%s: segment %llu must be clean",
 413                            __func__, (unsigned long long)segnum);
 414                 kunmap_atomic(kaddr);
 415                 return;
 416         }
 417         nilfs_segment_usage_set_dirty(su);
 418         kunmap_atomic(kaddr);
 419
 420         nilfs_sufile_mod_counter(header_bh, -1, 1);
 421         NILFS_SUI(sufile)->ncleansegs--;
 422
 423         mark_buffer_dirty(su_bh);
 424         nilfs_mdt_mark_dirty(sufile);
 425 }
 426
 427 void nilfs_sufile_do_scrap(struct inode *sufile, __u64 segnum,
 428                            struct buffer_head *header_bh,
 429                            struct buffer_head *su_bh)
 430 {
 431         struct nilfs_segment_usage *su;
 432         void *kaddr;
 433         int clean, dirty;
 434
 435         kaddr = kmap_atomic(su_bh->b_page);
 436         su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
 437         if (su->su_flags == cpu_to_le32(BIT(NILFS_SEGMENT_USAGE_DIRTY)) &&
 438             su->su_nblocks == cpu_to_le32(0)) {
 439                 kunmap_atomic(kaddr);
 440                 return;
 441         }
 442         clean = nilfs_segment_usage_clean(su);
 443         dirty = nilfs_segment_usage_dirty(su);
 444
 445         /* make the segment garbage */
 446         su->su_lastmod = cpu_to_le64(0);
 447         su->su_nblocks = cpu_to_le32(0);
 448         su->su_flags = cpu_to_le32(BIT(NILFS_SEGMENT_USAGE_DIRTY));
 449         kunmap_atomic(kaddr);
 450
 451         nilfs_sufile_mod_counter(header_bh, clean ? (u64)-1 : 0, dirty ? 0 : 1);
 452         NILFS_SUI(sufile)->ncleansegs -= clean;
 453
 454         mark_buffer_dirty(su_bh);
 455         nilfs_mdt_mark_dirty(sufile);
 456 }
 457
 458 void nilfs_sufile_do_free(struct inode *sufile, __u64 segnum,
 459                           struct buffer_head *header_bh,
 460                           struct buffer_head *su_bh)
 461 {
 462         struct nilfs_segment_usage *su;
 463         void *kaddr;
 464         int sudirty;
 465
 466         kaddr = kmap_atomic(su_bh->b_page);
 467         su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
 468         if (nilfs_segment_usage_clean(su)) {
 469                 nilfs_warn(sufile->i_sb, "%s: segment %llu is already clean",
 470                            __func__, (unsigned long long)segnum);
 471                 kunmap_atomic(kaddr);
 472                 return;
 473         }
 474         WARN_ON(nilfs_segment_usage_error(su));
 475         WARN_ON(!nilfs_segment_usage_dirty(su));
 476
 477         sudirty = nilfs_segment_usage_dirty(su);
 478         nilfs_segment_usage_set_clean(su);
 479         kunmap_atomic(kaddr);
 480         mark_buffer_dirty(su_bh);
 481
 482         nilfs_sufile_mod_counter(header_bh, 1, sudirty ? (u64)-1 : 0);
 483         NILFS_SUI(sufile)->ncleansegs++;
 484
 485         nilfs_mdt_mark_dirty(sufile);
 486
 487         trace_nilfs2_segment_usage_freed(sufile, segnum);
 488 }
 489
 490 /**
 491  * nilfs_sufile_mark_dirty - mark the buffer having a segment usage dirty
 492  * @sufile: inode of segment usage file
 493  * @segnum: segment number
 494  */
 495 int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum)
 496 {
 497         struct buffer_head *bh;
 498         void *kaddr;
 499         struct nilfs_segment_usage *su;
 500         int ret;
 501
 502         down_write(&NILFS_MDT(sufile)->mi_sem);
 503         ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh);
 504         if (ret)
 505                 goto out_sem;
 506
 507         kaddr = kmap_atomic(bh->b_page);
 508         su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr);
 509         if (unlikely(nilfs_segment_usage_error(su))) {
 510                 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
 511
 512                 kunmap_atomic(kaddr);
 513                 brelse(bh);
 514                 if (nilfs_segment_is_active(nilfs, segnum)) {
 515                         nilfs_error(sufile->i_sb,
 516                                     "active segment %llu is erroneous",
 517                                     (unsigned long long)segnum);
 518                 } else {
 519                         /*
 520                          * Segments marked erroneous are never allocated by
 521                          * nilfs_sufile_alloc(); only active segments, ie,
 522                          * the segments indexed by ns_segnum or ns_nextnum,
 523                          * can be erroneous here.
 524                          */
 525                         WARN_ON_ONCE(1);
 526                 }
 527                 ret = -EIO;
 528         } else {
 529                 nilfs_segment_usage_set_dirty(su);
 530                 kunmap_atomic(kaddr);
 531                 mark_buffer_dirty(bh);
 532                 nilfs_mdt_mark_dirty(sufile);
 533                 brelse(bh);
 534         }
 535 out_sem:
 536         up_write(&NILFS_MDT(sufile)->mi_sem);
 537         return ret;
 538 }
 539
 540 /**
 541  * nilfs_sufile_set_segment_usage - set usage of a segment
 542  * @sufile: inode of segment usage file
 543  * @segnum: segment number
 544  * @nblocks: number of live blocks in the segment
 545  * @modtime: modification time (option)
 546  */
 547 int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
 548                                    unsigned long nblocks, time64_t modtime)
 549 {
 550         struct buffer_head *bh;
 551         struct nilfs_segment_usage *su;
 552         void *kaddr;
 553         int ret;
 554
 555         down_write(&NILFS_MDT(sufile)->mi_sem);
 556         ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh);
 557         if (ret < 0)
 558                 goto out_sem;
 559
 560         kaddr = kmap_atomic(bh->b_page);
 561         su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr);
 562         if (modtime) {
 563                 /*
 564                  * Check segusage error and set su_lastmod only when updating
 565                  * this entry with a valid timestamp, not for cancellation.
 566                  */
 567                 WARN_ON_ONCE(nilfs_segment_usage_error(su));
 568                 su->su_lastmod = cpu_to_le64(modtime);
 569         }
 570         su->su_nblocks = cpu_to_le32(nblocks);
 571         kunmap_atomic(kaddr);
 572
 573         mark_buffer_dirty(bh);
 574         nilfs_mdt_mark_dirty(sufile);
 575         brelse(bh);
 576
 577  out_sem:
 578         up_write(&NILFS_MDT(sufile)->mi_sem);
 579         return ret;
 580 }
 581
 582 /**
 583  * nilfs_sufile_get_stat - get segment usage statistics
 584  * @sufile: inode of segment usage file
 585  * @sustat: pointer to a structure of segment usage statistics
 586  *
 587  * Description: nilfs_sufile_get_stat() returns information about segment
 588  * usage.
 589  *
 590  * Return Value: On success, 0 is returned, and segment usage information is
 591  * stored in the place pointed by @sustat. On error, one of the following
 592  * negative error codes is returned.
 593  *
 594  * %-EIO - I/O error.
 595  *
 596  * %-ENOMEM - Insufficient amount of memory available.
 597  */
 598 int nilfs_sufile_get_stat(struct inode *sufile, struct nilfs_sustat *sustat)
 599 {
 600         struct buffer_head *header_bh;
 601         struct nilfs_sufile_header *header;
 602         struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
 603         void *kaddr;
 604         int ret;
 605
 606         down_read(&NILFS_MDT(sufile)->mi_sem);
 607
 608         ret = nilfs_sufile_get_header_block(sufile, &header_bh);
 609         if (ret < 0)
 610                 goto out_sem;
 611
 612         kaddr = kmap_atomic(header_bh->b_page);
 613         header = kaddr + bh_offset(header_bh);
 614         sustat->ss_nsegs = nilfs_sufile_get_nsegments(sufile);
 615         sustat->ss_ncleansegs = le64_to_cpu(header->sh_ncleansegs);
 616         sustat->ss_ndirtysegs = le64_to_cpu(header->sh_ndirtysegs);
 617         sustat->ss_ctime = nilfs->ns_ctime;
 618         sustat->ss_nongc_ctime = nilfs->ns_nongc_ctime;
 619         spin_lock(&nilfs->ns_last_segment_lock);
 620         sustat->ss_prot_seq = nilfs->ns_prot_seq;
 621         spin_unlock(&nilfs->ns_last_segment_lock);
 622         kunmap_atomic(kaddr);
 623         brelse(header_bh);
 624
 625  out_sem:
 626         up_read(&NILFS_MDT(sufile)->mi_sem);
 627         return ret;
 628 }
 629
 630 void nilfs_sufile_do_set_error(struct inode *sufile, __u64 segnum,
 631                                struct buffer_head *header_bh,
 632                                struct buffer_head *su_bh)
 633 {
 634         struct nilfs_segment_usage *su;
 635         void *kaddr;
 636         int suclean;
 637
 638         kaddr = kmap_atomic(su_bh->b_page);
 639         su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
 640         if (nilfs_segment_usage_error(su)) {
 641                 kunmap_atomic(kaddr);
 642                 return;
 643         }
 644         suclean = nilfs_segment_usage_clean(su);
 645         nilfs_segment_usage_set_error(su);
 646         kunmap_atomic(kaddr);
 647
 648         if (suclean) {
 649                 nilfs_sufile_mod_counter(header_bh, -1, 0);
 650                 NILFS_SUI(sufile)->ncleansegs--;
 651         }
 652         mark_buffer_dirty(su_bh);
 653         nilfs_mdt_mark_dirty(sufile);
 654 }
 655
 656 /**
 657  * nilfs_sufile_truncate_range - truncate range of segment array
 658  * @sufile: inode of segment usage file
 659  * @start: start segment number (inclusive)
 660  * @end: end segment number (inclusive)
 661  *
 662  * Return Value: On success, 0 is returned.  On error, one of the
 663  * following negative error codes is returned.
 664  *
 665  * %-EIO - I/O error.
 666  *
 667  * %-ENOMEM - Insufficient amount of memory available.
 668  *
 669  * %-EINVAL - Invalid number of segments specified
 670  *
 671  * %-EBUSY - Dirty or active segments are present in the range
 672  */
 673 static int nilfs_sufile_truncate_range(struct inode *sufile,
 674                                        __u64 start, __u64 end)
 675 {
 676         struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
 677         struct buffer_head *header_bh;
 678         struct buffer_head *su_bh;
 679         struct nilfs_segment_usage *su, *su2;
 680         size_t susz = NILFS_MDT(sufile)->mi_entry_size;
 681         unsigned long segusages_per_block;
 682         unsigned long nsegs, ncleaned;
 683         __u64 segnum;
 684         void *kaddr;
 685         ssize_t n, nc;
 686         int ret;
 687         int j;
 688
 689         nsegs = nilfs_sufile_get_nsegments(sufile);
 690
 691         ret = -EINVAL;
 692         if (start > end || start >= nsegs)
 693                 goto out;
 694
 695         ret = nilfs_sufile_get_header_block(sufile, &header_bh);
 696         if (ret < 0)
 697                 goto out;
 698
 699         segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile);
 700         ncleaned = 0;
 701
 702         for (segnum = start; segnum <= end; segnum += n) {
 703                 n = min_t(unsigned long,
 704                           segusages_per_block -
 705                                   nilfs_sufile_get_offset(sufile, segnum),
 706                           end - segnum + 1);
 707                 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0,
 708                                                            &su_bh);
 709                 if (ret < 0) {
 710                         if (ret != -ENOENT)
 711                                 goto out_header;
 712                         /* hole */
 713                         continue;
 714                 }
 715                 kaddr = kmap_atomic(su_bh->b_page);
 716                 su = nilfs_sufile_block_get_segment_usage(
 717                         sufile, segnum, su_bh, kaddr);
 718                 su2 = su;
 719                 for (j = 0; j < n; j++, su = (void *)su + susz) {
 720                         if ((le32_to_cpu(su->su_flags) &
 721                              ~BIT(NILFS_SEGMENT_USAGE_ERROR)) ||
 722                             nilfs_segment_is_active(nilfs, segnum + j)) {
 723                                 ret = -EBUSY;
 724                                 kunmap_atomic(kaddr);
 725                                 brelse(su_bh);
 726                                 goto out_header;
 727                         }
 728                 }
 729                 nc = 0;
 730                 for (su = su2, j = 0; j < n; j++, su = (void *)su + susz) {
 731                         if (nilfs_segment_usage_error(su)) {
 732                                 nilfs_segment_usage_set_clean(su);
 733                                 nc++;
 734                         }
 735                 }
 736                 kunmap_atomic(kaddr);
 737                 if (nc > 0) {
 738                         mark_buffer_dirty(su_bh);
 739                         ncleaned += nc;
 740                 }
 741                 brelse(su_bh);
 742
 743                 if (n == segusages_per_block) {
 744                         /* make hole */
 745                         nilfs_sufile_delete_segment_usage_block(sufile, segnum);
 746                 }
 747         }
 748         ret = 0;
 749
 750 out_header:
 751         if (ncleaned > 0) {
 752                 NILFS_SUI(sufile)->ncleansegs += ncleaned;
 753                 nilfs_sufile_mod_counter(header_bh, ncleaned, 0);
 754                 nilfs_mdt_mark_dirty(sufile);
 755         }
 756         brelse(header_bh);
 757 out:
 758         return ret;
 759 }
 760
 761 /**
 762  * nilfs_sufile_resize - resize segment array
 763  * @sufile: inode of segment usage file
 764  * @newnsegs: new number of segments
 765  *
 766  * Return Value: On success, 0 is returned.  On error, one of the
 767  * following negative error codes is returned.
 768  *
 769  * %-EIO - I/O error.
 770  *
 771  * %-ENOMEM - Insufficient amount of memory available.
 772  *
 773  * %-ENOSPC - Enough free space is not left for shrinking
 774  *
 775  * %-EBUSY - Dirty or active segments exist in the region to be truncated
 776  */
 777 int nilfs_sufile_resize(struct inode *sufile, __u64 newnsegs)
 778 {
 779         struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
 780         struct buffer_head *header_bh;
 781         struct nilfs_sufile_header *header;
 782         struct nilfs_sufile_info *sui = NILFS_SUI(sufile);
 783         void *kaddr;
 784         unsigned long nsegs, nrsvsegs;
 785         int ret = 0;
 786
 787         down_write(&NILFS_MDT(sufile)->mi_sem);
 788
 789         nsegs = nilfs_sufile_get_nsegments(sufile);
 790         if (nsegs == newnsegs)
 791                 goto out;
 792
 793         ret = -ENOSPC;
 794         nrsvsegs = nilfs_nrsvsegs(nilfs, newnsegs);
 795         if (newnsegs < nsegs && nsegs - newnsegs + nrsvsegs > sui->ncleansegs)
 796                 goto out;
 797
 798         ret = nilfs_sufile_get_header_block(sufile, &header_bh);
 799         if (ret < 0)
 800                 goto out;
 801
 802         if (newnsegs > nsegs) {
 803                 sui->ncleansegs += newnsegs - nsegs;
 804         } else /* newnsegs < nsegs */ {
 805                 ret = nilfs_sufile_truncate_range(sufile, newnsegs, nsegs - 1);
 806                 if (ret < 0)
 807                         goto out_header;
 808
 809                 sui->ncleansegs -= nsegs - newnsegs;
 810
 811                 /*
 812                  * If the sufile is successfully truncated, immediately adjust
 813                  * the segment allocation space while locking the semaphore
 814                  * "mi_sem" so that nilfs_sufile_alloc() never allocates
 815                  * segments in the truncated space.
 816                  */
 817                 sui->allocmax = newnsegs - 1;
 818                 sui->allocmin = 0;
 819         }
 820
 821         kaddr = kmap_atomic(header_bh->b_page);
 822         header = kaddr + bh_offset(header_bh);
 823         header->sh_ncleansegs = cpu_to_le64(sui->ncleansegs);
 824         kunmap_atomic(kaddr);
 825
 826         mark_buffer_dirty(header_bh);
 827         nilfs_mdt_mark_dirty(sufile);
 828         nilfs_set_nsegments(nilfs, newnsegs);
 829
 830 out_header:
 831         brelse(header_bh);
 832 out:
 833         up_write(&NILFS_MDT(sufile)->mi_sem);
 834         return ret;
 835 }
 836
 837 /**
 838  * nilfs_sufile_get_suinfo -
 839  * @sufile: inode of segment usage file
 840  * @segnum: segment number to start looking
 841  * @buf: array of suinfo
 842  * @sisz: byte size of suinfo
 843  * @nsi: size of suinfo array
 844  *
 845  * Description:
 846  *
 847  * Return Value: On success, 0 is returned and .... On error, one of the
 848  * following negative error codes is returned.
 849  *
 850  * %-EIO - I/O error.
 851  *
 852  * %-ENOMEM - Insufficient amount of memory available.
 853  */
 854 ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf,
 855                                 unsigned int sisz, size_t nsi)
 856 {
 857         struct buffer_head *su_bh;
 858         struct nilfs_segment_usage *su;
 859         struct nilfs_suinfo *si = buf;
 860         size_t susz = NILFS_MDT(sufile)->mi_entry_size;
 861         struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
 862         void *kaddr;
 863         unsigned long nsegs, segusages_per_block;
 864         ssize_t n;
 865         int ret, i, j;
 866
 867         down_read(&NILFS_MDT(sufile)->mi_sem);
 868
 869         segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile);
 870         nsegs = min_t(unsigned long,
 871                       nilfs_sufile_get_nsegments(sufile) - segnum,
 872                       nsi);
 873         for (i = 0; i < nsegs; i += n, segnum += n) {
 874                 n = min_t(unsigned long,
 875                           segusages_per_block -
 876                                   nilfs_sufile_get_offset(sufile, segnum),
 877                           nsegs - i);
 878                 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0,
 879                                                            &su_bh);
 880                 if (ret < 0) {
 881                         if (ret != -ENOENT)
 882                                 goto out;
 883                         /* hole */
 884                         memset(si, 0, sisz * n);
 885                         si = (void *)si + sisz * n;
 886                         continue;
 887                 }
 888
 889                 kaddr = kmap_atomic(su_bh->b_page);
 890                 su = nilfs_sufile_block_get_segment_usage(
 891                         sufile, segnum, su_bh, kaddr);
 892                 for (j = 0; j < n;
 893                      j++, su = (void *)su + susz, si = (void *)si + sisz) {
 894                         si->sui_lastmod = le64_to_cpu(su->su_lastmod);
 895                         si->sui_nblocks = le32_to_cpu(su->su_nblocks);
 896                         si->sui_flags = le32_to_cpu(su->su_flags) &
 897                                 ~BIT(NILFS_SEGMENT_USAGE_ACTIVE);
 898                         if (nilfs_segment_is_active(nilfs, segnum + j))
 899                                 si->sui_flags |=
 900                                         BIT(NILFS_SEGMENT_USAGE_ACTIVE);
 901                 }
 902                 kunmap_atomic(kaddr);
 903                 brelse(su_bh);
 904         }
 905         ret = nsegs;
 906
 907  out:
 908         up_read(&NILFS_MDT(sufile)->mi_sem);
 909         return ret;
 910 }
 911
 912 /**
 913  * nilfs_sufile_set_suinfo - sets segment usage info
 914  * @sufile: inode of segment usage file
 915  * @buf: array of suinfo_update
 916  * @supsz: byte size of suinfo_update
 917  * @nsup: size of suinfo_update array
 918  *
 919  * Description: Takes an array of nilfs_suinfo_update structs and updates
 920  * segment usage accordingly. Only the fields indicated by the sup_flags
 921  * are updated.
 922  *
 923  * Return Value: On success, 0 is returned. On error, one of the
 924  * following negative error codes is returned.
 925  *
 926  * %-EIO - I/O error.
 927  *
 928  * %-ENOMEM - Insufficient amount of memory available.
 929  *
 930  * %-EINVAL - Invalid values in input (segment number, flags or nblocks)
 931  */
 932 ssize_t nilfs_sufile_set_suinfo(struct inode *sufile, void *buf,
 933                                 unsigned int supsz, size_t nsup)
 934 {
 935         struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
 936         struct buffer_head *header_bh, *bh;
 937         struct nilfs_suinfo_update *sup, *supend = buf + supsz * nsup;
 938         struct nilfs_segment_usage *su;
 939         void *kaddr;
 940         unsigned long blkoff, prev_blkoff;
 941         int cleansi, cleansu, dirtysi, dirtysu;
 942         long ncleaned = 0, ndirtied = 0;
 943         int ret = 0;
 944
 945         if (unlikely(nsup == 0))
 946                 return ret;
 947
 948         for (sup = buf; sup < supend; sup = (void *)sup + supsz) {
 949                 if (sup->sup_segnum >= nilfs->ns_nsegments
 950                         || (sup->sup_flags &
 951                                 (~0UL << __NR_NILFS_SUINFO_UPDATE_FIELDS))
 952                         || (nilfs_suinfo_update_nblocks(sup) &&
 953                                 sup->sup_sui.sui_nblocks >
 954                                 nilfs->ns_blocks_per_segment))
 955                         return -EINVAL;
 956         }
 957
 958         down_write(&NILFS_MDT(sufile)->mi_sem);
 959
 960         ret = nilfs_sufile_get_header_block(sufile, &header_bh);
 961         if (ret < 0)
 962                 goto out_sem;
 963
 964         sup = buf;
 965         blkoff = nilfs_sufile_get_blkoff(sufile, sup->sup_segnum);
 966         ret = nilfs_mdt_get_block(sufile, blkoff, 1, NULL, &bh);
 967         if (ret < 0)
 968                 goto out_header;
 969
 970         for (;;) {
 971                 kaddr = kmap_atomic(bh->b_page);
 972                 su = nilfs_sufile_block_get_segment_usage(
 973                         sufile, sup->sup_segnum, bh, kaddr);
 974
 975                 if (nilfs_suinfo_update_lastmod(sup))
 976                         su->su_lastmod = cpu_to_le64(sup->sup_sui.sui_lastmod);
 977
 978                 if (nilfs_suinfo_update_nblocks(sup))
 979                         su->su_nblocks = cpu_to_le32(sup->sup_sui.sui_nblocks);
 980
 981                 if (nilfs_suinfo_update_flags(sup)) {
 982                         /*
 983                          * Active flag is a virtual flag projected by running
 984                          * nilfs kernel code - drop it not to write it to
 985                          * disk.
 986                          */
 987                         sup->sup_sui.sui_flags &=
 988                                         ~BIT(NILFS_SEGMENT_USAGE_ACTIVE);
 989
 990                         cleansi = nilfs_suinfo_clean(&sup->sup_sui);
 991                         cleansu = nilfs_segment_usage_clean(su);
 992                         dirtysi = nilfs_suinfo_dirty(&sup->sup_sui);
 993                         dirtysu = nilfs_segment_usage_dirty(su);
 994
 995                         if (cleansi && !cleansu)
 996                                 ++ncleaned;
 997                         else if (!cleansi && cleansu)
 998                                 --ncleaned;
 999
1000                         if (dirtysi && !dirtysu)
1001                                 ++ndirtied;
1002                         else if (!dirtysi && dirtysu)
1003                                 --ndirtied;
1004
1005                         su->su_flags = cpu_to_le32(sup->sup_sui.sui_flags);
1006                 }
1007
1008                 kunmap_atomic(kaddr);
1009
1010                 sup = (void *)sup + supsz;
1011                 if (sup >= supend)
1012                         break;
1013
1014                 prev_blkoff = blkoff;
1015                 blkoff = nilfs_sufile_get_blkoff(sufile, sup->sup_segnum);
1016                 if (blkoff == prev_blkoff)
1017                         continue;
1018
1019                 /* get different block */
1020                 mark_buffer_dirty(bh);
1021                 put_bh(bh);
1022                 ret = nilfs_mdt_get_block(sufile, blkoff, 1, NULL, &bh);
1023                 if (unlikely(ret < 0))
1024                         goto out_mark;
1025         }
1026         mark_buffer_dirty(bh);
1027         put_bh(bh);
1028
1029  out_mark:
1030         if (ncleaned || ndirtied) {
1031                 nilfs_sufile_mod_counter(header_bh, (u64)ncleaned,
1032                                 (u64)ndirtied);
1033                 NILFS_SUI(sufile)->ncleansegs += ncleaned;
1034         }
1035         nilfs_mdt_mark_dirty(sufile);
1036  out_header:
1037         put_bh(header_bh);
1038  out_sem:
1039         up_write(&NILFS_MDT(sufile)->mi_sem);
1040         return ret;
1041 }
1042
1043 /**
1044  * nilfs_sufile_trim_fs() - trim ioctl handle function
1045  * @sufile: inode of segment usage file
1046  * @range: fstrim_range structure
1047  *
1048  * start:       First Byte to trim
1049  * len:         number of Bytes to trim from start
1050  * minlen:      minimum extent length in Bytes
1051  *
1052  * Decription: nilfs_sufile_trim_fs goes through all segments containing bytes
1053  * from start to start+len. start is rounded up to the next block boundary
1054  * and start+len is rounded down. For each clean segment blkdev_issue_discard
1055  * function is invoked.
1056  *
1057  * Return Value: On success, 0 is returned or negative error code, otherwise.
1058  */
1059 int nilfs_sufile_trim_fs(struct inode *sufile, struct fstrim_range *range)
1060 {
1061         struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
1062         struct buffer_head *su_bh;
1063         struct nilfs_segment_usage *su;
1064         void *kaddr;
1065         size_t n, i, susz = NILFS_MDT(sufile)->mi_entry_size;
1066         sector_t seg_start, seg_end, start_block, end_block;
1067         sector_t start = 0, nblocks = 0;
1068         u64 segnum, segnum_end, minlen, len, max_blocks, ndiscarded = 0;
1069         int ret = 0;
1070         unsigned int sects_per_block;
1071
1072         sects_per_block = (1 << nilfs->ns_blocksize_bits) /
1073                         bdev_logical_block_size(nilfs->ns_bdev);
1074         len = range->len >> nilfs->ns_blocksize_bits;
1075         minlen = range->minlen >> nilfs->ns_blocksize_bits;
1076         max_blocks = ((u64)nilfs->ns_nsegments * nilfs->ns_blocks_per_segment);
1077
1078         if (!len || range->start >= max_blocks << nilfs->ns_blocksize_bits)
1079                 return -EINVAL;
1080
1081         start_block = (range->start + nilfs->ns_blocksize - 1) >>
1082                         nilfs->ns_blocksize_bits;
1083
1084         /*
1085          * range->len can be very large (actually, it is set to
1086          * ULLONG_MAX by default) - truncate upper end of the range
1087          * carefully so as not to overflow.
1088          */
1089         if (max_blocks - start_block < len)
1090                 end_block = max_blocks - 1;
1091         else
1092                 end_block = start_block + len - 1;
1093
1094         segnum = nilfs_get_segnum_of_block(nilfs, start_block);
1095         segnum_end = nilfs_get_segnum_of_block(nilfs, end_block);
1096
1097         down_read(&NILFS_MDT(sufile)->mi_sem);
1098
1099         while (segnum <= segnum_end) {
1100                 n = nilfs_sufile_segment_usages_in_block(sufile, segnum,
1101                                 segnum_end);
1102
1103                 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0,
1104                                                            &su_bh);
1105                 if (ret < 0) {
1106                         if (ret != -ENOENT)
1107                                 goto out_sem;
1108                         /* hole */
1109                         segnum += n;
1110                         continue;
1111                 }
1112
1113                 kaddr = kmap_atomic(su_bh->b_page);
1114                 su = nilfs_sufile_block_get_segment_usage(sufile, segnum,
1115                                 su_bh, kaddr);
1116                 for (i = 0; i < n; ++i, ++segnum, su = (void *)su + susz) {
1117                         if (!nilfs_segment_usage_clean(su))
1118                                 continue;
1119
1120                         nilfs_get_segment_range(nilfs, segnum, &seg_start,
1121                                                 &seg_end);
1122
1123                         if (!nblocks) {
1124                                 /* start new extent */
1125                                 start = seg_start;
1126                                 nblocks = seg_end - seg_start + 1;
1127                                 continue;
1128                         }
1129
1130                         if (start + nblocks == seg_start) {
1131                                 /* add to previous extent */
1132                                 nblocks += seg_end - seg_start + 1;
1133                                 continue;
1134                         }
1135
1136                         /* discard previous extent */
1137                         if (start < start_block) {
1138                                 nblocks -= start_block - start;
1139                                 start = start_block;
1140                         }
1141
1142                         if (nblocks >= minlen) {
1143                                 kunmap_atomic(kaddr);
1144
1145                                 ret = blkdev_issue_discard(nilfs->ns_bdev,
1146                                                 start * sects_per_block,
1147                                                 nblocks * sects_per_block,
1148                                                 GFP_NOFS);
1149                                 if (ret < 0) {
1150                                         put_bh(su_bh);
1151                                         goto out_sem;
1152                                 }
1153
1154                                 ndiscarded += nblocks;
1155                                 kaddr = kmap_atomic(su_bh->b_page);
1156                                 su = nilfs_sufile_block_get_segment_usage(
1157                                         sufile, segnum, su_bh, kaddr);
1158                         }
1159
1160                         /* start new extent */
1161                         start = seg_start;
1162                         nblocks = seg_end - seg_start + 1;
1163                 }
1164                 kunmap_atomic(kaddr);
1165                 put_bh(su_bh);
1166         }
1167
1168
1169         if (nblocks) {
1170                 /* discard last extent */
1171                 if (start < start_block) {
1172                         nblocks -= start_block - start;
1173                         start = start_block;
1174                 }
1175                 if (start + nblocks > end_block + 1)
1176                         nblocks = end_block - start + 1;
1177
1178                 if (nblocks >= minlen) {
1179                         ret = blkdev_issue_discard(nilfs->ns_bdev,
1180                                         start * sects_per_block,
1181                                         nblocks * sects_per_block,
1182                                         GFP_NOFS);
1183                         if (!ret)
1184                                 ndiscarded += nblocks;
1185                 }
1186         }
1187
1188 out_sem:
1189         up_read(&NILFS_MDT(sufile)->mi_sem);
1190
1191         range->len = ndiscarded << nilfs->ns_blocksize_bits;
1192         return ret;
1193 }
1194
1195 /**
1196  * nilfs_sufile_read - read or get sufile inode
1197  * @sb: super block instance
1198  * @susize: size of a segment usage entry
1199  * @raw_inode: on-disk sufile inode
1200  * @inodep: buffer to store the inode
1201  */
1202 int nilfs_sufile_read(struct super_block *sb, size_t susize,
1203                       struct nilfs_inode *raw_inode, struct inode **inodep)
1204 {
1205         struct inode *sufile;
1206         struct nilfs_sufile_info *sui;
1207         struct buffer_head *header_bh;
1208         struct nilfs_sufile_header *header;
1209         void *kaddr;
1210         int err;
1211
1212         if (susize > sb->s_blocksize) {
1213                 nilfs_err(sb, "too large segment usage size: %zu bytes",
1214                           susize);
1215                 return -EINVAL;
1216         } else if (susize < NILFS_MIN_SEGMENT_USAGE_SIZE) {
1217                 nilfs_err(sb, "too small segment usage size: %zu bytes",
1218                           susize);
1219                 return -EINVAL;
1220         }
1221
1222         sufile = nilfs_iget_locked(sb, NULL, NILFS_SUFILE_INO);
1223         if (unlikely(!sufile))
1224                 return -ENOMEM;
1225         if (!(sufile->i_state & I_NEW))
1226                 goto out;
1227
1228         err = nilfs_mdt_init(sufile, NILFS_MDT_GFP, sizeof(*sui));
1229         if (err)
1230                 goto failed;
1231
1232         nilfs_mdt_set_entry_size(sufile, susize,
1233                                  sizeof(struct nilfs_sufile_header));
1234
1235         err = nilfs_read_inode_common(sufile, raw_inode);
1236         if (err)
1237                 goto failed;
1238
1239         err = nilfs_sufile_get_header_block(sufile, &header_bh);
1240         if (err)
1241                 goto failed;
1242
1243         sui = NILFS_SUI(sufile);
1244         kaddr = kmap_atomic(header_bh->b_page);
1245         header = kaddr + bh_offset(header_bh);
1246         sui->ncleansegs = le64_to_cpu(header->sh_ncleansegs);
1247         kunmap_atomic(kaddr);
1248         brelse(header_bh);
1249
1250         sui->allocmax = nilfs_sufile_get_nsegments(sufile) - 1;
1251         sui->allocmin = 0;
1252
1253         unlock_new_inode(sufile);
1254  out:
1255         *inodep = sufile;
1256         return 0;
1257  failed:
1258         iget_failed(sufile);
1259         return err;
1260 }