2 * Copyright (c) 2011-2015 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@dragonflybsd.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #include <sys/types.h>
36 #include <sys/diskslice.h>
37 #include <sys/diskmbr.h>
40 #include <sys/sysctl.h>
41 #include <sys/ioctl.h>
42 #include <vfs/hammer2/hammer2_xxhash.h>
43 #include <vfs/hammer2/hammer2_disk.h>
57 #define MAXLABELS HAMMER2_SET_COUNT
59 #define hammer2_icrc32(buf, size) iscsi_crc32((buf), (size))
60 #define hammer2_icrc32c(buf, size, crc) iscsi_crc32_ext((buf), (size), (crc))
61 uint32_t iscsi_crc32(const void *buf, size_t size);
62 uint32_t iscsi_crc32_ext(const void *buf, size_t size, uint32_t ocrc);
64 static hammer2_off_t check_volume(const char *path, int *fdp);
65 static int64_t getsize(const char *str, int64_t minval, int64_t maxval, int pw);
66 static const char *sizetostr(hammer2_off_t size);
67 static uint64_t nowtime(void);
68 static int blkrefary_cmp(const void *b1, const void *b2);
69 static void usage(void);
71 static void format_hammer2(int fd, hammer2_off_t total_space,
72 hammer2_off_t free_space);
73 static void alloc_direct(hammer2_off_t *basep, hammer2_blockref_t *bref,
75 static hammer2_key_t dirhash(const unsigned char *name, size_t len);
77 static int Hammer2Version = -1;
78 static int ForceOpt = 0;
79 static uuid_t Hammer2_FSType; /* static filesystem type id for HAMMER2 */
80 static uuid_t Hammer2_VolFSID; /* unique filesystem id in volu header */
81 static uuid_t Hammer2_SupCLID; /* PFS cluster id in super-root inode */
82 static uuid_t Hammer2_SupFSID; /* PFS unique id in super-root inode */
83 static uuid_t Hammer2_PfsCLID[MAXLABELS];
84 static uuid_t Hammer2_PfsFSID[MAXLABELS];
85 static const char *Label[MAXLABELS];
86 static hammer2_off_t BootAreaSize;
87 static hammer2_off_t AuxAreaSize;
91 main(int ac, char **av)
94 hammer2_off_t total_space;
95 hammer2_off_t free_space;
96 hammer2_off_t reserved_space;
100 int defaultlabels = 1;
107 Label[NLabels++] = "LOCAL";
110 * Sanity check basic filesystem structures. No cookies for us
113 assert(sizeof(hammer2_volume_data_t) == HAMMER2_VOLUME_BYTES);
114 assert(sizeof(hammer2_inode_data_t) == HAMMER2_INODE_BYTES);
115 assert(sizeof(hammer2_blockref_t) == HAMMER2_BLOCKREF_BYTES);
118 * Generate a filesystem id and lookup the filesystem type
121 uuidgen(&Hammer2_VolFSID, 1);
122 uuidgen(&Hammer2_SupCLID, 1);
123 uuidgen(&Hammer2_SupFSID, 1);
124 uuid_from_string(HAMMER2_UUID_STRING, &Hammer2_FSType, &status);
125 /*uuid_name_lookup(&Hammer2_FSType, "DragonFly HAMMER2", &status);*/
126 if (status != uuid_s_ok) {
127 errx(1, "uuids file does not have the DragonFly "
128 "HAMMER2 filesystem type");
134 while ((ch = getopt(ac, av, "fL:b:m:r:V:")) != -1) {
141 if (strcasecmp(optarg, "none") == 0) {
144 if (NLabels >= MAXLABELS) {
145 errx(1, "Limit of %d local labels",
148 Label[NLabels++] = optarg;
149 if (strlen(Label[NLabels-1]) > HAMMER2_INODE_MAXNAME) {
150 errx(1, "Volume label '%s' is too long "
151 "(64 chars max)\n", optarg);
155 BootAreaSize = getsize(optarg,
157 HAMMER2_BOOT_MAX_BYTES, 2);
160 AuxAreaSize = getsize(optarg,
162 HAMMER2_REDO_MAX_BYTES, 2);
165 Hammer2Version = strtol(optarg, NULL, 0);
166 if (Hammer2Version < HAMMER2_VOL_VERSION_MIN ||
167 Hammer2Version >= HAMMER2_VOL_VERSION_WIP) {
169 "I don't understand how to format "
170 "HAMMER2 version %d\n",
181 * Check Hammer2 version
183 if (Hammer2Version < 0) {
184 size_t olen = sizeof(Hammer2Version);
185 Hammer2Version = HAMMER2_VOL_VERSION_DEFAULT;
186 if (sysctlbyname("vfs.hammer2.supported_version",
187 &Hammer2Version, &olen, NULL, 0) == 0) {
188 if (Hammer2Version >= HAMMER2_VOL_VERSION_WIP) {
189 Hammer2Version = HAMMER2_VOL_VERSION_WIP - 1;
191 "newfs_hammer2: WARNING: HAMMER2 VFS "
192 "supports higher version than I "
194 "using version %d\n",
199 "newfs_hammer2: WARNING: HAMMER2 VFS not "
200 "loaded, cannot get version info.\n"
201 "Using version %d\n",
202 HAMMER2_VOL_VERSION_DEFAULT);
209 if (ac != 1 || av[0][0] == 0) {
210 fprintf(stderr, "Exactly one disk device must be specified\n");
215 * Adjust Label[] and NLabels.
218 char c = av[0][strlen(av[0]) - 1];
220 Label[NLabels++] = "BOOT";
222 Label[NLabels++] = "ROOT";
224 Label[NLabels++] = "DATA";
228 * Collect volume information.
230 total_space = check_volume(av[0], &fd);
233 * ~typically 8MB alignment to avoid edge cases for reserved blocks
234 * and so raid stripes (if any) operate efficiently.
236 total_space &= ~HAMMER2_VOLUME_ALIGNMASK64;
239 * Calculate defaults for the boot area size and round to the
240 * volume alignment boundary.
242 * NOTE: These areas are currently not used for booting but are
243 * reserved for future filesystem expansion.
245 if (BootAreaSize == 0) {
246 BootAreaSize = HAMMER2_BOOT_NOM_BYTES;
247 while (BootAreaSize > total_space / 20)
249 if (BootAreaSize < HAMMER2_BOOT_MIN_BYTES)
250 BootAreaSize = HAMMER2_BOOT_MIN_BYTES;
251 } else if (BootAreaSize < HAMMER2_BOOT_MIN_BYTES) {
252 BootAreaSize = HAMMER2_BOOT_MIN_BYTES;
254 BootAreaSize = (BootAreaSize + HAMMER2_VOLUME_ALIGNMASK64) &
255 ~HAMMER2_VOLUME_ALIGNMASK64;
258 * Calculate defaults for the redo area size and round to the
259 * volume alignment boundary.
261 * NOTE: These areas are currently not used for logging but are
262 * reserved for future filesystem expansion.
264 if (AuxAreaSize == 0) {
265 AuxAreaSize = HAMMER2_REDO_NOM_BYTES;
266 while (AuxAreaSize > total_space / 20)
268 if (AuxAreaSize < HAMMER2_REDO_MIN_BYTES)
269 AuxAreaSize = HAMMER2_REDO_MIN_BYTES;
270 } else if (AuxAreaSize < HAMMER2_REDO_MIN_BYTES) {
271 AuxAreaSize = HAMMER2_REDO_MIN_BYTES;
273 AuxAreaSize = (AuxAreaSize + HAMMER2_VOLUME_ALIGNMASK64) &
274 ~HAMMER2_VOLUME_ALIGNMASK64;
277 * We'll need to stuff this in the volume header soon.
279 uuid_to_string(&Hammer2_VolFSID, &vol_fsid, &status);
280 uuid_to_string(&Hammer2_SupCLID, &sup_clid_name, &status);
281 uuid_to_string(&Hammer2_SupFSID, &sup_fsid_name, &status);
284 * Calculate the amount of reserved space. HAMMER2_ZONE_SEG (4MB)
285 * is reserved at the beginning of every 2GB of storage, rounded up.
286 * Thus a 200MB filesystem will still have a 4MB reserve area.
288 * We also include the boot and redo areas in the reserve. The
289 * reserve is used to help 'df' calculate the amount of available
292 * XXX I kinda screwed up and made the reserved area on the LEVEL1
293 * boundary rather than the ZONE boundary. LEVEL1 is on 1GB
294 * boundaries rather than 2GB boundaries. Stick with the LEVEL1
297 reserved_space = ((total_space + HAMMER2_FREEMAP_LEVEL1_MASK) /
298 HAMMER2_FREEMAP_LEVEL1_SIZE) * HAMMER2_ZONE_SEG64;
300 free_space = total_space - reserved_space - BootAreaSize - AuxAreaSize;
302 format_hammer2(fd, total_space, free_space);
306 printf("---------------------------------------------\n");
307 printf("version: %d\n", Hammer2Version);
308 printf("total-size: %s (%jd bytes)\n",
309 sizetostr(total_space),
310 (intmax_t)total_space);
311 printf("boot-area-size: %s\n", sizetostr(BootAreaSize));
312 printf("aux-area-size: %s\n", sizetostr(AuxAreaSize));
313 printf("topo-reserved: %s\n", sizetostr(reserved_space));
314 printf("free-space: %s\n", sizetostr(free_space));
315 printf("vol-fsid: %s\n", vol_fsid);
316 printf("sup-clid: %s\n", sup_clid_name);
317 printf("sup-fsid: %s\n", sup_fsid_name);
318 for (i = 0; i < NLabels; ++i) {
319 printf("PFS \"%s\"\n", Label[i]);
320 uuid_to_string(&Hammer2_PfsCLID[i], &pfs_clid_name, &status);
321 uuid_to_string(&Hammer2_PfsFSID[i], &pfs_fsid_name, &status);
322 printf(" clid %s\n", pfs_clid_name);
323 printf(" fsid %s\n", pfs_fsid_name);
341 "usage: newfs_hammer2 [-f] [-b bootsize] [-r redosize] "
342 "[-V version] [-L label ...] special\n"
348 * Convert the size in bytes to a human readable string.
352 sizetostr(hammer2_off_t size)
356 if (size < 1024 / 2) {
357 snprintf(buf, sizeof(buf), "%6.2f", (double)size);
358 } else if (size < 1024 * 1024 / 2) {
359 snprintf(buf, sizeof(buf), "%6.2fKB",
360 (double)size / 1024);
361 } else if (size < 1024 * 1024 * 1024LL / 2) {
362 snprintf(buf, sizeof(buf), "%6.2fMB",
363 (double)size / (1024 * 1024));
364 } else if (size < 1024 * 1024 * 1024LL * 1024LL / 2) {
365 snprintf(buf, sizeof(buf), "%6.2fGB",
366 (double)size / (1024 * 1024 * 1024LL));
368 snprintf(buf, sizeof(buf), "%6.2fTB",
369 (double)size / (1024 * 1024 * 1024LL * 1024LL));
375 * Convert a string to a 64 bit signed integer with various requirements.
378 getsize(const char *str, int64_t minval, int64_t maxval, int powerof2)
383 val = strtoll(str, &ptr, 0);
402 errx(1, "Unknown suffix in number '%s'\n", str);
406 errx(1, "Unknown suffix in number '%s'\n", str);
410 errx(1, "Value too small: %s, min is %s\n",
411 str, sizetostr(minval));
415 errx(1, "Value too large: %s, max is %s\n",
416 str, sizetostr(maxval));
419 if ((powerof2 & 1) && (val ^ (val - 1)) != ((val << 1) - 1)) {
420 errx(1, "Value not power of 2: %s\n", str);
423 if ((powerof2 & 2) && (val & HAMMER2_NEWFS_ALIGNMASK)) {
424 errx(1, "Value not an integral multiple of %dK: %s",
425 HAMMER2_NEWFS_ALIGN / 1024, str);
437 gettimeofday(&tv, NULL);
438 xtime = tv.tv_sec * 1000000LL + tv.tv_usec;
443 * Figure out how big the volume is.
447 check_volume(const char *path, int *fdp)
449 struct partinfo pinfo;
454 * Get basic information about the volume
456 *fdp = open(path, O_RDWR);
458 err(1, "Unable to open %s R+W", path);
459 if (ioctl(*fdp, DIOCGPART, &pinfo) < 0) {
461 * Allow the formatting of regular files as HAMMER2 volumes
463 if (fstat(*fdp, &st) < 0)
464 err(1, "Unable to stat %s", path);
465 if (!S_ISREG(st.st_mode))
466 errx(1, "Unsupported file type for %s", path);
470 * When formatting a block device as a HAMMER2 volume the
471 * sector size must be compatible. HAMMER2 uses 64K
472 * filesystem buffers but logical buffers for direct I/O
473 * can be as small as HAMMER2_LOGSIZE (16KB).
475 if (pinfo.reserved_blocks) {
476 errx(1, "HAMMER2 cannot be placed in a partition "
477 "which overlaps the disklabel or MBR");
479 if (pinfo.media_blksize > HAMMER2_PBUFSIZE ||
480 HAMMER2_PBUFSIZE % pinfo.media_blksize) {
481 errx(1, "A media sector size of %d is not supported",
482 pinfo.media_blksize);
484 size = pinfo.media_size;
486 printf("Volume %-15s size %s\n", path, sizetostr(size));
491 * Create the volume header, the super-root directory inode, and
492 * the writable snapshot subdirectory (named via the label) which
493 * is to be the initial mount point, or at least the first mount point.
495 * [----reserved_area----][boot_area][aux_area]
496 * [[vol_hdr]... ] [sroot][root]...
498 * Also format the allocation map.
500 * NOTE: The passed total_space is 8MB-aligned to avoid edge cases.
504 format_hammer2(int fd, hammer2_off_t total_space, hammer2_off_t free_space)
506 char *buf = malloc(HAMMER2_PBUFSIZE);
507 hammer2_volume_data_t *vol;
508 hammer2_inode_data_t *rawip;
509 hammer2_blockref_t sroot_blockref;
510 hammer2_blockref_t root_blockref[MAXLABELS];
512 hammer2_off_t volu_base = 0;
513 hammer2_off_t boot_base = HAMMER2_ZONE_SEG;
514 hammer2_off_t aux_base = boot_base + BootAreaSize;
515 hammer2_off_t alloc_base = aux_base + AuxAreaSize;
516 hammer2_off_t tmp_base;
521 * Clear the entire reserve for the first 2G segment and
522 * make sure we can write to the last block.
524 bzero(buf, HAMMER2_PBUFSIZE);
525 tmp_base = volu_base;
526 for (i = 0; i < HAMMER2_ZONE_BLOCKS_SEG; ++i) {
527 n = pwrite(fd, buf, HAMMER2_PBUFSIZE, tmp_base);
528 if (n != HAMMER2_PBUFSIZE) {
532 tmp_base += HAMMER2_PBUFSIZE;
535 n = pwrite(fd, buf, HAMMER2_PBUFSIZE,
536 volu_base + total_space - HAMMER2_PBUFSIZE);
537 if (n != HAMMER2_PBUFSIZE) {
538 perror("write (at-end-of-volume)");
543 * Make sure alloc_base won't cross the reserved area at the
544 * beginning of each 2GB zone.
546 * Reserve space for the super-root inode and the root inode.
547 * Make sure they are in the same 64K block to simplify our code.
549 assert((alloc_base & HAMMER2_PBUFMASK) == 0);
550 assert(alloc_base < HAMMER2_ZONE_BYTES64 - HAMMER2_ZONE_SEG);
552 bzero(buf, HAMMER2_PBUFSIZE);
554 alloc_base &= ~HAMMER2_PBUFMASK64;
555 alloc_direct(&alloc_base, &sroot_blockref, HAMMER2_INODE_BYTES);
557 for (i = 0; i < NLabels; ++i) {
558 uuidgen(&Hammer2_PfsCLID[i], 1);
559 uuidgen(&Hammer2_PfsFSID[i], 1);
561 alloc_direct(&alloc_base, &root_blockref[i],
562 HAMMER2_INODE_BYTES);
563 assert(((sroot_blockref.data_off ^ root_blockref[i].data_off) &
564 HAMMER2_OFF_MASK_HI) == 0);
567 * Format the root directory inode, which is left empty.
569 rawip = (void *)(buf + (HAMMER2_OFF_MASK_LO &
570 root_blockref[i].data_off));
571 rawip->meta.version = HAMMER2_INODE_VERSION_ONE;
572 rawip->meta.ctime = now;
573 rawip->meta.mtime = now;
574 /* rawip->atime = now; NOT IMPL MUST BE ZERO */
575 rawip->meta.btime = now;
576 rawip->meta.type = HAMMER2_OBJTYPE_DIRECTORY;
577 rawip->meta.mode = 0755;
578 rawip->meta.inum = 1; /* root inode, inumber 1 */
579 rawip->meta.nlinks = 1; /* directory link count compat */
581 rawip->meta.name_len = strlen(Label[i]);
582 bcopy(Label[i], rawip->filename, rawip->meta.name_len);
583 rawip->meta.name_key =
584 dirhash(rawip->filename, rawip->meta.name_len);
587 * Compression mode and supported copyids.
589 * Do not allow compression when creating any "BOOT" label
590 * (pfs-create also does the same if the pfs is named "BOOT")
592 if (strcasecmp(Label[i], "BOOT") == 0) {
593 rawip->meta.comp_algo = HAMMER2_ENC_ALGO(
594 HAMMER2_COMP_AUTOZERO);
595 rawip->meta.check_algo = HAMMER2_ENC_ALGO(
596 HAMMER2_CHECK_XXHASH64);
598 rawip->meta.comp_algo = HAMMER2_ENC_ALGO(
599 HAMMER2_COMP_NEWFS_DEFAULT);
600 rawip->meta.check_algo = HAMMER2_ENC_ALGO(
601 HAMMER2_CHECK_XXHASH64);
605 * NOTE: We leave nmasters set to 0, which means that we
606 * don't know how many masters there are. The quorum
607 * calculation will effectively be 1 ( 0 / 2 + 1 ).
609 rawip->meta.pfs_clid = Hammer2_PfsCLID[i];
610 rawip->meta.pfs_fsid = Hammer2_PfsFSID[i];
611 rawip->meta.pfs_type = HAMMER2_PFSTYPE_MASTER;
612 rawip->meta.op_flags |= HAMMER2_OPFLAG_PFSROOT;
614 /* first allocatable inode number */
615 rawip->meta.pfs_inum = 16;
617 /* rawip->u.blockset is left empty */
620 * The root blockref will be stored in the super-root inode as
621 * the only directory entry. The copyid here is the actual
622 * copyid of the storage ref.
624 * The key field for a directory entry's blockref is
625 * essentially the name key for the entry.
627 root_blockref[i].key = rawip->meta.name_key;
628 root_blockref[i].copyid = HAMMER2_COPYID_LOCAL;
629 root_blockref[i].keybits = 0;
630 root_blockref[i].check.xxhash64.value =
631 XXH64(rawip, sizeof(*rawip), XXH_HAMMER2_SEED);
632 root_blockref[i].type = HAMMER2_BREF_TYPE_INODE;
633 root_blockref[i].methods =
634 HAMMER2_ENC_CHECK(HAMMER2_CHECK_XXHASH64) |
635 HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
636 root_blockref[i].mirror_tid = 16;
637 root_blockref[i].flags = HAMMER2_BREF_FLAG_PFSROOT;
641 * Format the super-root directory inode, giving it one directory
642 * entry (root_blockref) and fixup the icrc method.
644 * The superroot contains one directory entry pointing at the root
645 * inode (named via the label). Inodes contain one blockset which
646 * is fully associative so we can put the entry anywhere without
647 * having to worry about the hash. Use index 0.
649 rawip = (void *)(buf + (HAMMER2_OFF_MASK_LO & sroot_blockref.data_off));
650 rawip->meta.version = HAMMER2_INODE_VERSION_ONE;
651 rawip->meta.ctime = now;
652 rawip->meta.mtime = now;
653 /* rawip->meta.atime = now; NOT IMPL MUST BE ZERO */
654 rawip->meta.btime = now;
655 rawip->meta.type = HAMMER2_OBJTYPE_DIRECTORY;
656 rawip->meta.mode = 0700; /* super-root - root only */
657 rawip->meta.inum = 0; /* super root inode, inumber 0 */
658 rawip->meta.nlinks = 2; /* directory link count compat */
660 rawip->meta.name_len = 0; /* super-root is unnamed */
661 rawip->meta.name_key = 0;
663 rawip->meta.comp_algo = HAMMER2_ENC_ALGO(HAMMER2_COMP_AUTOZERO);
664 rawip->meta.check_algo = HAMMER2_ENC_ALGO(HAMMER2_CHECK_XXHASH64);
667 * The super-root is flagged as a PFS and typically given its own
668 * random FSID, making it possible to mirror an entire HAMMER2 disk
669 * snapshots and all if desired. PFS ids are used to match up
670 * mirror sources and targets and cluster copy sources and targets.
672 * (XXX whole-disk logical mirroring is not really supported in
673 * the first attempt because each PFS is in its own modify/mirror
674 * transaction id domain, so normal mechanics cannot cross a PFS
677 rawip->meta.pfs_clid = Hammer2_SupCLID;
678 rawip->meta.pfs_fsid = Hammer2_SupFSID;
679 rawip->meta.pfs_type = HAMMER2_PFSTYPE_SUPROOT;
680 snprintf((char*)rawip->filename, sizeof(rawip->filename), "SUPROOT");
681 rawip->meta.name_key = 0;
682 rawip->meta.name_len = strlen((char*)rawip->filename);
684 /* The super-root has an inode number of 0 */
685 rawip->meta.pfs_inum = 0;
688 * Currently newfs_hammer2 just throws the PFS inodes into the
689 * top-level block table at the volume root and doesn't try to
690 * create an indirect block, so we are limited to ~4 at filesystem
691 * creation time. More can be added after mounting.
693 qsort(root_blockref, NLabels, sizeof(root_blockref[0]), blkrefary_cmp);
694 for (i = 0; i < NLabels; ++i)
695 rawip->u.blockset.blockref[i] = root_blockref[i];
698 * The sroot blockref will be stored in the volume header.
700 sroot_blockref.copyid = HAMMER2_COPYID_LOCAL;
701 sroot_blockref.keybits = 0;
702 sroot_blockref.check.xxhash64.value =
703 XXH64(rawip, sizeof(*rawip), XXH_HAMMER2_SEED);
704 sroot_blockref.type = HAMMER2_BREF_TYPE_INODE;
705 sroot_blockref.methods = HAMMER2_ENC_CHECK(HAMMER2_CHECK_XXHASH64) |
706 HAMMER2_ENC_COMP(HAMMER2_COMP_AUTOZERO);
707 sroot_blockref.mirror_tid = 16;
711 * Write out the 64K HAMMER2 block containing the root and sroot.
713 n = pwrite(fd, buf, HAMMER2_PBUFSIZE,
714 sroot_blockref.data_off & HAMMER2_OFF_MASK_HI);
715 if (n != HAMMER2_PBUFSIZE) {
721 * Format the volume header.
723 * The volume header points to sroot_blockref. Also be absolutely
724 * sure that allocator_beg is set.
726 bzero(buf, HAMMER2_PBUFSIZE);
729 vol->magic = HAMMER2_VOLUME_ID_HBO;
730 vol->boot_beg = boot_base;
731 vol->boot_end = boot_base + BootAreaSize;
732 vol->aux_beg = aux_base;
733 vol->aux_end = aux_base + AuxAreaSize;
734 vol->volu_size = total_space;
735 vol->version = Hammer2Version;
738 vol->fsid = Hammer2_VolFSID;
739 vol->fstype = Hammer2_FSType;
741 vol->peer_type = DMSG_PEER_HAMMER2; /* LNK_CONN identification */
743 vol->allocator_size = free_space;
744 vol->allocator_free = free_space;
745 vol->allocator_beg = alloc_base;
747 vol->sroot_blockset.blockref[0] = sroot_blockref;
748 vol->mirror_tid = 16; /* all blockref mirror TIDs set to 16 */
749 vol->freemap_tid = 16; /* all blockref mirror TIDs set to 16 */
750 vol->icrc_sects[HAMMER2_VOL_ICRC_SECT1] =
751 hammer2_icrc32((char *)vol + HAMMER2_VOLUME_ICRC1_OFF,
752 HAMMER2_VOLUME_ICRC1_SIZE);
755 * Set ICRC_SECT0 after all remaining elements of sect0 have been
756 * populated in the volume header. Note hat ICRC_SECT* (except for
757 * SECT0) are part of sect0.
759 vol->icrc_sects[HAMMER2_VOL_ICRC_SECT0] =
760 hammer2_icrc32((char *)vol + HAMMER2_VOLUME_ICRC0_OFF,
761 HAMMER2_VOLUME_ICRC0_SIZE);
762 vol->icrc_volheader =
763 hammer2_icrc32((char *)vol + HAMMER2_VOLUME_ICRCVH_OFF,
764 HAMMER2_VOLUME_ICRCVH_SIZE);
767 * Write the volume header and all alternates.
769 for (i = 0; i < HAMMER2_NUM_VOLHDRS; ++i) {
770 if (i * HAMMER2_ZONE_BYTES64 >= total_space)
772 n = pwrite(fd, buf, HAMMER2_PBUFSIZE,
773 volu_base + i * HAMMER2_ZONE_BYTES64);
774 if (n != HAMMER2_PBUFSIZE) {
787 alloc_direct(hammer2_off_t *basep, hammer2_blockref_t *bref, size_t bytes)
793 while ((bytes & 1) == 0) {
798 if (radix < HAMMER2_RADIX_MIN)
799 radix = HAMMER2_RADIX_MIN;
801 bzero(bref, sizeof(*bref));
802 bref->data_off = *basep | radix;
803 bref->vradix = radix;
805 *basep += 1U << radix;
809 * Borrow HAMMER1's directory hash algorithm #1 with a few modifications.
810 * The filename is split into fields which are hashed separately and then
813 * Differences include: bit 63 must be set to 1 for HAMMER2 (HAMMER1 sets
814 * it to 0), this is because bit63=0 is used for hidden hardlinked inodes.
815 * (This means we do not need to do a 0-check/or-with-0x100000000 either).
817 * Also, the iscsi crc code is used instead of the old crc32 code.
820 dirhash(const unsigned char *name, size_t len)
822 const unsigned char *aname = name;
829 * Filesystem version 6 or better will create directories
830 * using the ALG1 dirhash. This hash breaks the filename
831 * up into domains separated by special characters and
832 * hashes each domain independently.
834 * We also do a simple sub-sort using the first character
835 * of the filename in the top 5-bits.
843 for (i = j = 0; i < len; ++i) {
844 if (aname[i] == '.' ||
849 crcx += hammer2_icrc32(aname + j, i - j);
854 crcx += hammer2_icrc32(aname + j, i - j);
857 * The directory hash utilizes the top 32 bits of the 64-bit key.
858 * Bit 63 must be set to 1.
861 key |= (uint64_t)crcx << 32;
864 * l16 - crc of entire filename
866 * This crc reduces degenerate hash collision conditions
868 crcx = hammer2_icrc32(aname, len);
869 crcx = crcx ^ (crcx << 16);
870 key |= crcx & 0xFFFF0000U;
873 * Set bit 15. This allows readdir to strip bit 63 so a positive
874 * 64-bit cookie/offset can always be returned, and still guarantee
875 * that the values 0x0000-0x7FFF are available for artificial entries.
884 blkrefary_cmp(const void *b1, const void *b2)
886 const hammer2_blockref_t *bref1 = b1;
887 const hammer2_blockref_t *bref2 = b2;
888 if (bref1->key < bref2->key)
890 if (bref1->key > bref2->key)