2 * Copyright (c) 2011-2014 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 <vfs/hammer2/hammer2_disk.h>
57 #define hammer2_icrc32(buf, size) iscsi_crc32((buf), (size))
58 #define hammer2_icrc32c(buf, size, crc) iscsi_crc32_ext((buf), (size), (crc))
59 uint32_t iscsi_crc32(const void *buf, size_t size);
60 uint32_t iscsi_crc32_ext(const void *buf, size_t size, uint32_t ocrc);
62 static hammer2_off_t check_volume(const char *path, int *fdp);
63 static int64_t getsize(const char *str, int64_t minval, int64_t maxval, int pw);
64 static const char *sizetostr(hammer2_off_t size);
65 static uint64_t nowtime(void);
66 static int blkrefary_cmp(const void *b1, const void *b2);
67 static void usage(void);
69 static void format_hammer2(int fd, hammer2_off_t total_space,
70 hammer2_off_t free_space);
71 static void alloc_direct(hammer2_off_t *basep, hammer2_blockref_t *bref,
73 static hammer2_key_t dirhash(const unsigned char *name, size_t len);
75 static int Hammer2Version = -1;
76 static int ForceOpt = 0;
77 static uuid_t Hammer2_FSType; /* static filesystem type id for HAMMER2 */
78 static uuid_t Hammer2_VolFSID; /* unique filesystem id in volu header */
79 static uuid_t Hammer2_SupCLID; /* PFS cluster id in super-root inode */
80 static uuid_t Hammer2_SupFSID; /* PFS unique id in super-root inode */
81 static uuid_t Hammer2_PfsCLID; /* PFS cluster id in labeled pfs (root) */
82 static uuid_t Hammer2_PfsFSID; /* PFS unique id in labeled pfs (root) */
83 static const char *Label[MAXLABELS];
84 static hammer2_off_t BootAreaSize;
85 static hammer2_off_t AuxAreaSize;
88 #define GIG ((hammer2_off_t)1024*1024*1024)
91 main(int ac, char **av)
94 hammer2_off_t total_space;
95 hammer2_off_t free_space;
96 hammer2_off_t reserved_space;
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 uuidgen(&Hammer2_PfsCLID, 1);
125 uuidgen(&Hammer2_PfsFSID, 1);
126 uuid_from_string(HAMMER2_UUID_STRING, &Hammer2_FSType, &status);
127 /*uuid_name_lookup(&Hammer2_FSType, "DragonFly HAMMER2", &status);*/
128 if (status != uuid_s_ok) {
129 errx(1, "uuids file does not have the DragonFly "
130 "HAMMER2 filesystem type");
136 while ((ch = getopt(ac, av, "fL:b:m:r:V:")) != -1) {
142 if (strcasecmp(optarg, "none") == 0) {
146 if (NLabels >= MAXLABELS) {
147 errx(1, "Limit of 3 local labels");
149 Label[NLabels++] = optarg;
150 if (strlen(Label[NLabels-1]) > HAMMER2_INODE_MAXNAME) {
151 errx(1, "Root directory label too long "
156 BootAreaSize = getsize(optarg,
158 HAMMER2_BOOT_MAX_BYTES, 2);
161 AuxAreaSize = getsize(optarg,
163 HAMMER2_REDO_MAX_BYTES, 2);
166 Hammer2Version = strtol(optarg, NULL, 0);
167 if (Hammer2Version < HAMMER2_VOL_VERSION_MIN ||
168 Hammer2Version >= HAMMER2_VOL_VERSION_WIP) {
170 "I don't understand how to format "
171 "HAMMER2 version %d\n",
177 uuid_from_string(optarg, &Hammer2_SupCLID, &status);
178 if (status != uuid_s_ok)
179 errx(1, "uuid %s badly formatted", optarg);
182 uuid_from_string(optarg, &Hammer2_PfsCLID, &status);
183 if (status != uuid_s_ok)
184 errx(1, "uuid %s badly formatted", optarg);
194 * Adjust Label[] and NLabels
198 } else if (NLabels == 1) {
199 Label[NLabels++] = "BOOT";
200 Label[NLabels++] = "ROOT";
204 * Check Hammer2 version
206 if (Hammer2Version < 0) {
207 size_t olen = sizeof(Hammer2Version);
208 Hammer2Version = HAMMER2_VOL_VERSION_DEFAULT;
209 if (sysctlbyname("vfs.hammer2.supported_version",
210 &Hammer2Version, &olen, NULL, 0) == 0) {
211 if (Hammer2Version >= HAMMER2_VOL_VERSION_WIP) {
212 Hammer2Version = HAMMER2_VOL_VERSION_WIP - 1;
214 "newfs_hammer: WARNING: HAMMER2 VFS "
215 "supports higher version than I "
217 "using version %d\n",
222 "newfs_hammer: WARNING: HAMMER2 VFS not "
223 "loaded, cannot get version info.\n"
224 "Using version %d\n",
225 HAMMER2_VOL_VERSION_DEFAULT);
230 * Collect volume information.
236 fprintf(stderr, "Exactly one disk device must be specified\n");
239 total_space = check_volume(av[0], &fd);
242 * ~typically 8MB alignment to avoid edge cases for reserved blocks
243 * and so raid stripes (if any) operate efficiently.
245 total_space &= ~HAMMER2_VOLUME_ALIGNMASK64;
248 * Calculate defaults for the boot area size and round to the
249 * volume alignment boundary.
251 if (BootAreaSize == 0) {
252 BootAreaSize = HAMMER2_BOOT_NOM_BYTES;
253 while (BootAreaSize > total_space / 20)
255 if (BootAreaSize < HAMMER2_BOOT_MIN_BYTES)
256 BootAreaSize = HAMMER2_BOOT_MIN_BYTES;
257 } else if (BootAreaSize < HAMMER2_BOOT_MIN_BYTES) {
258 BootAreaSize = HAMMER2_BOOT_MIN_BYTES;
260 BootAreaSize = (BootAreaSize + HAMMER2_VOLUME_ALIGNMASK64) &
261 ~HAMMER2_VOLUME_ALIGNMASK64;
264 * Calculate defaults for the redo area size and round to the
265 * volume alignment boundary.
267 if (AuxAreaSize == 0) {
268 AuxAreaSize = HAMMER2_REDO_NOM_BYTES;
269 while (AuxAreaSize > total_space / 20)
271 if (AuxAreaSize < HAMMER2_REDO_MIN_BYTES)
272 AuxAreaSize = HAMMER2_REDO_MIN_BYTES;
273 } else if (AuxAreaSize < HAMMER2_REDO_MIN_BYTES) {
274 AuxAreaSize = HAMMER2_REDO_MIN_BYTES;
276 AuxAreaSize = (AuxAreaSize + HAMMER2_VOLUME_ALIGNMASK64) &
277 ~HAMMER2_VOLUME_ALIGNMASK64;
280 * We'll need to stuff this in the volume header soon.
282 uuid_to_string(&Hammer2_VolFSID, &vol_fsid, &status);
283 uuid_to_string(&Hammer2_SupCLID, &sup_clid, &status);
284 uuid_to_string(&Hammer2_SupFSID, &sup_fsid, &status);
285 uuid_to_string(&Hammer2_PfsCLID, &pfs_clid, &status);
286 uuid_to_string(&Hammer2_PfsFSID, &pfs_fsid, &status);
289 * Calculate the amount of reserved space. HAMMER2_ZONE_SEG (4MB)
290 * is reserved at the beginning of every 2GB of storage, rounded up.
291 * Thus a 200MB filesystem will still have a 4MB reserve area.
293 * We also include the boot and redo areas in the reserve. The
294 * reserve is used to help 'df' calculate the amount of available
297 reserved_space = ((total_space + HAMMER2_ZONE_MASK64) /
298 HAMMER2_ZONE_BYTES64) * HAMMER2_ZONE_SEG64;
300 free_space = total_space - reserved_space -
301 BootAreaSize - AuxAreaSize;
303 format_hammer2(fd, total_space, free_space);
307 printf("---------------------------------------------\n");
308 printf("total-size: %s (%jd bytes)\n",
309 sizetostr(total_space),
310 (intmax_t)total_space);
311 printf("local-labels: %s", Label[0]);
312 for (i = 1; i < NLabels; ++i)
313 printf(", %s", Label[i]);
315 printf("version: %d\n", Hammer2Version);
316 printf("boot-area-size: %s\n", sizetostr(BootAreaSize));
317 printf("aux-area-size: %s\n", sizetostr(AuxAreaSize));
318 printf("topo-reserved: %s\n", sizetostr(reserved_space));
319 printf("free-space: %s\n", sizetostr(free_space));
320 printf("vol-fsid: %s\n", vol_fsid);
321 printf("sup-clid: %s\n", sup_clid);
322 printf("sup-fsid: %s\n", sup_fsid);
323 printf("pfs-clid: %s\n", pfs_clid);
324 printf("pfs-fsid: %s\n", pfs_fsid);
335 "usage: newfs_hammer -L label [-f] [-b bootsize] "
336 "[-r redosize] [-V version] special ...\n"
342 * Convert the size in bytes to a human readable string.
346 sizetostr(hammer2_off_t size)
350 if (size < 1024 / 2) {
351 snprintf(buf, sizeof(buf), "%6.2f", (double)size);
352 } else if (size < 1024 * 1024 / 2) {
353 snprintf(buf, sizeof(buf), "%6.2fKB",
354 (double)size / 1024);
355 } else if (size < 1024 * 1024 * 1024LL / 2) {
356 snprintf(buf, sizeof(buf), "%6.2fMB",
357 (double)size / (1024 * 1024));
358 } else if (size < 1024 * 1024 * 1024LL * 1024LL / 2) {
359 snprintf(buf, sizeof(buf), "%6.2fGB",
360 (double)size / (1024 * 1024 * 1024LL));
362 snprintf(buf, sizeof(buf), "%6.2fTB",
363 (double)size / (1024 * 1024 * 1024LL * 1024LL));
369 * Convert a string to a 64 bit signed integer with various requirements.
372 getsize(const char *str, int64_t minval, int64_t maxval, int powerof2)
377 val = strtoll(str, &ptr, 0);
396 errx(1, "Unknown suffix in number '%s'\n", str);
400 errx(1, "Unknown suffix in number '%s'\n", str);
404 errx(1, "Value too small: %s, min is %s\n",
405 str, sizetostr(minval));
409 errx(1, "Value too large: %s, max is %s\n",
410 str, sizetostr(maxval));
413 if ((powerof2 & 1) && (val ^ (val - 1)) != ((val << 1) - 1)) {
414 errx(1, "Value not power of 2: %s\n", str);
417 if ((powerof2 & 2) && (val & HAMMER2_NEWFS_ALIGNMASK)) {
418 errx(1, "Value not an integral multiple of %dK: %s",
419 HAMMER2_NEWFS_ALIGN / 1024, str);
431 gettimeofday(&tv, NULL);
432 xtime = tv.tv_sec * 1000000LL + tv.tv_usec;
437 * Figure out how big the volume is.
441 check_volume(const char *path, int *fdp)
443 struct partinfo pinfo;
448 * Get basic information about the volume
450 *fdp = open(path, O_RDWR);
452 err(1, "Unable to open %s R+W", path);
453 if (ioctl(*fdp, DIOCGPART, &pinfo) < 0) {
455 * Allow the formatting of regular files as HAMMER2 volumes
457 if (fstat(*fdp, &st) < 0)
458 err(1, "Unable to stat %s", path);
462 * When formatting a block device as a HAMMER2 volume the
463 * sector size must be compatible. HAMMER2 uses 64K
464 * filesystem buffers but logical buffers for direct I/O
465 * can be as small as HAMMER2_LOGSIZE (16KB).
467 if (pinfo.reserved_blocks) {
468 errx(1, "HAMMER cannot be placed in a partition "
469 "which overlaps the disklabel or MBR");
471 if (pinfo.media_blksize > HAMMER2_PBUFSIZE ||
472 HAMMER2_PBUFSIZE % pinfo.media_blksize) {
473 errx(1, "A media sector size of %d is not supported",
474 pinfo.media_blksize);
476 size = pinfo.media_size;
478 printf("Volume %-15s size %s\n", path, sizetostr(size));
483 * Create the volume header, the super-root directory inode, and
484 * the writable snapshot subdirectory (named via the label) which
485 * is to be the initial mount point, or at least the first mount point.
487 * [----reserved_area----][boot_area][aux_area]
488 * [[vol_hdr]... ] [sroot][root]
490 * The sroot and root inodes eat 512 bytes each. newfs labels can only be
491 * 64 bytes so the root (snapshot) inode does not need to extend past 512
492 * bytes. We use the correct hash slot correct but note that because
493 * directory hashes are chained 16x, any slot in the inode will work.
495 * Also format the allocation map.
497 * NOTE: The passed total_space is 8MB-aligned to avoid edge cases.
501 format_hammer2(int fd, hammer2_off_t total_space, hammer2_off_t free_space)
503 char *buf = malloc(HAMMER2_PBUFSIZE);
504 hammer2_volume_data_t *vol;
505 hammer2_inode_data_t *rawip;
506 hammer2_blockref_t sroot_blockref;
507 hammer2_blockref_t root_blockref[MAXLABELS]; /* Max 4 labels */
509 hammer2_off_t volu_base = 0;
510 hammer2_off_t boot_base = HAMMER2_ZONE_SEG;
511 hammer2_off_t aux_base = boot_base + BootAreaSize;
512 hammer2_off_t alloc_base = aux_base + AuxAreaSize;
513 hammer2_off_t tmp_base;
518 * Clear the entire reserve for the first 2G segment and
519 * make sure we can write to the last block.
521 bzero(buf, HAMMER2_PBUFSIZE);
522 tmp_base = volu_base;
523 for (i = 0; i < HAMMER2_ZONE_BLOCKS_SEG; ++i) {
524 n = pwrite(fd, buf, HAMMER2_PBUFSIZE, tmp_base);
525 if (n != HAMMER2_PBUFSIZE) {
529 tmp_base += HAMMER2_PBUFSIZE;
532 n = pwrite(fd, buf, HAMMER2_PBUFSIZE,
533 volu_base + total_space - HAMMER2_PBUFSIZE);
534 if (n != HAMMER2_PBUFSIZE) {
535 perror("write (at-end-of-volume)");
540 * Make sure alloc_base won't cross the reserved area at the
541 * beginning of each 2GB zone.
543 * Reserve space for the super-root inode and the root inode.
544 * Make sure they are in the same 64K block to simplify our code.
546 assert((alloc_base & HAMMER2_PBUFMASK) == 0);
547 assert(alloc_base < HAMMER2_ZONE_BYTES64 - HAMMER2_ZONE_SEG);
549 bzero(buf, HAMMER2_PBUFSIZE);
551 alloc_base &= ~HAMMER2_PBUFMASK64;
552 alloc_direct(&alloc_base, &sroot_blockref, HAMMER2_INODE_BYTES);
554 for (i = 0; i < NLabels; ++i) {
555 alloc_direct(&alloc_base, &root_blockref[i],
556 HAMMER2_INODE_BYTES);
557 assert(((sroot_blockref.data_off ^ root_blockref[i].data_off) &
558 HAMMER2_OFF_MASK_HI) == 0);
561 * Format the root directory inode, which is left empty.
563 rawip = (void *)(buf + (HAMMER2_OFF_MASK_LO &
564 root_blockref[i].data_off));
565 rawip->version = HAMMER2_INODE_VERSION_ONE;
568 /* rawip->atime = now; NOT IMPL MUST BE ZERO */
570 rawip->type = HAMMER2_OBJTYPE_DIRECTORY;
572 rawip->inum = 1; /* root inode, inumber 1 */
573 rawip->nlinks = 1; /* directory link count compat */
575 rawip->name_len = strlen(Label[i]);
576 bcopy(Label[i], rawip->filename, rawip->name_len);
577 rawip->name_key = dirhash(rawip->filename, rawip->name_len);
580 * Compression mode and supported copyids.
582 * Do not allow compression when creating a "BOOT" label
583 * (pfs-create also does the same if the pfs is named "BOOT")
585 if (strcasecmp(Label[i], "BOOT") == 0) {
586 rawip->comp_algo = HAMMER2_COMP_AUTOZERO;
588 rawip->comp_algo = HAMMER2_COMP_NEWFS_DEFAULT;
591 rawip->pfs_clid = Hammer2_PfsCLID;
592 rawip->pfs_fsid = Hammer2_PfsCLID;
593 rawip->pfs_type = HAMMER2_PFSTYPE_MASTER;
594 rawip->op_flags |= HAMMER2_OPFLAG_PFSROOT;
595 rawip->pfs_inum = 16; /* first allocatable inode number */
597 /* rawip->u.blockset is left empty */
600 * The root blockref will be stored in the super-root inode as
601 * the only directory entry. The copyid here is the actual
602 * copyid of the storage ref.
604 * The key field for a directory entry's blockref is
605 * essentially the name key for the entry.
607 root_blockref[i].key = rawip->name_key;
608 root_blockref[i].copyid = HAMMER2_COPYID_LOCAL;
609 root_blockref[i].keybits = 0;
610 root_blockref[i].check.iscsi32.value =
611 hammer2_icrc32(rawip, sizeof(*rawip));
612 root_blockref[i].type = HAMMER2_BREF_TYPE_INODE;
613 root_blockref[i].methods =
614 HAMMER2_ENC_CHECK(HAMMER2_CHECK_ISCSI32) |
615 HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
616 root_blockref[i].mirror_tid = 16;
617 root_blockref[i].flags = HAMMER2_BREF_FLAG_PFSROOT;
621 * Format the super-root directory inode, giving it one directory
622 * entry (root_blockref) and fixup the icrc method.
624 * The superroot contains one directory entry pointing at the root
625 * inode (named via the label). Inodes contain one blockset which
626 * is fully associative so we can put the entry anywhere without
627 * having to worry about the hash. Use index 0.
629 rawip = (void *)(buf + (HAMMER2_OFF_MASK_LO & sroot_blockref.data_off));
630 rawip->version = HAMMER2_INODE_VERSION_ONE;
633 /* rawip->atime = now; NOT IMPL MUST BE ZERO */
635 rawip->type = HAMMER2_OBJTYPE_DIRECTORY;
636 rawip->mode = 0700; /* super-root - root only */
637 rawip->inum = 0; /* super root inode, inumber 0 */
638 rawip->nlinks = 2; /* directory link count compat */
640 rawip->name_len = 0; /* super-root is unnamed */
643 rawip->comp_algo = HAMMER2_COMP_AUTOZERO;
646 * The super-root is flagged as a PFS and typically given its own
647 * random FSID, making it possible to mirror an entire HAMMER2 disk
648 * snapshots and all if desired. PFS ids are used to match up
649 * mirror sources and targets and cluster copy sources and targets.
651 * (XXX whole-disk logical mirroring is not really supported in
652 * the first attempt because each PFS is in its own modify/mirror
653 * transaction id domain, so normal mechanics cannot cross a PFS
656 rawip->pfs_clid = Hammer2_SupCLID;
657 rawip->pfs_fsid = Hammer2_SupFSID;
658 rawip->pfs_type = HAMMER2_PFSTYPE_SUPROOT;
659 rawip->pfs_inum = 16; /* first allocatable inode number */
662 * The super-root has a directory entry pointing to each local
663 * PFS. To avoid having to deal with indirect blocks we can't load
664 * up more than 8 entries, but NLabels is restricted to 4 entries
665 * to leave room for possible future mandatory PFSs.
667 qsort(root_blockref, NLabels, sizeof(root_blockref[0]), blkrefary_cmp);
668 for (i = 0; i < NLabels; ++i)
669 rawip->u.blockset.blockref[i] = root_blockref[i];
672 * The sroot blockref will be stored in the volume header.
674 sroot_blockref.copyid = HAMMER2_COPYID_LOCAL;
675 sroot_blockref.keybits = 0;
676 sroot_blockref.check.iscsi32.value =
677 hammer2_icrc32(rawip, sizeof(*rawip));
678 sroot_blockref.type = HAMMER2_BREF_TYPE_INODE;
679 sroot_blockref.methods = HAMMER2_ENC_CHECK(HAMMER2_CHECK_ISCSI32) |
680 HAMMER2_ENC_COMP(HAMMER2_COMP_AUTOZERO);
681 sroot_blockref.mirror_tid = 16;
685 * Write out the 64K HAMMER2 block containing the root and sroot.
687 n = pwrite(fd, buf, HAMMER2_PBUFSIZE,
688 sroot_blockref.data_off & HAMMER2_OFF_MASK_HI);
689 if (n != HAMMER2_PBUFSIZE) {
695 * Format the volume header.
697 * The volume header points to sroot_blockref. Also be absolutely
698 * sure that allocator_beg is set.
700 bzero(buf, HAMMER2_PBUFSIZE);
703 vol->magic = HAMMER2_VOLUME_ID_HBO;
704 vol->boot_beg = boot_base;
705 vol->boot_end = boot_base + BootAreaSize;
706 vol->aux_beg = aux_base;
707 vol->aux_end = aux_base + AuxAreaSize;
708 vol->volu_size = total_space;
709 vol->version = Hammer2Version;
712 vol->fsid = Hammer2_VolFSID;
713 vol->fstype = Hammer2_FSType;
715 vol->peer_type = DMSG_PEER_HAMMER2; /* LNK_CONN identification */
717 vol->allocator_size = free_space;
718 vol->allocator_free = free_space;
719 vol->allocator_beg = alloc_base;
721 vol->sroot_blockset.blockref[0] = sroot_blockref;
722 vol->mirror_tid = 16; /* all blockref mirror TIDs set to 16 */
723 vol->freemap_tid = 16; /* all blockref mirror TIDs set to 16 */
724 vol->icrc_sects[HAMMER2_VOL_ICRC_SECT1] =
725 hammer2_icrc32((char *)vol + HAMMER2_VOLUME_ICRC1_OFF,
726 HAMMER2_VOLUME_ICRC1_SIZE);
729 * Set ICRC_SECT0 after all remaining elements of sect0 have been
730 * populated in the volume header. Note hat ICRC_SECT* (except for
731 * SECT0) are part of sect0.
733 vol->icrc_sects[HAMMER2_VOL_ICRC_SECT0] =
734 hammer2_icrc32((char *)vol + HAMMER2_VOLUME_ICRC0_OFF,
735 HAMMER2_VOLUME_ICRC0_SIZE);
736 vol->icrc_volheader =
737 hammer2_icrc32((char *)vol + HAMMER2_VOLUME_ICRCVH_OFF,
738 HAMMER2_VOLUME_ICRCVH_SIZE);
741 * Write the volume header and all alternates.
743 for (i = 0; i < HAMMER2_NUM_VOLHDRS; ++i) {
744 if (i * HAMMER2_ZONE_BYTES64 >= total_space)
746 n = pwrite(fd, buf, HAMMER2_PBUFSIZE,
747 volu_base + i * HAMMER2_ZONE_BYTES64);
748 if (n != HAMMER2_PBUFSIZE) {
761 alloc_direct(hammer2_off_t *basep, hammer2_blockref_t *bref, size_t bytes)
767 while ((bytes & 1) == 0) {
772 if (radix < HAMMER2_RADIX_MIN)
773 radix = HAMMER2_RADIX_MIN;
775 bzero(bref, sizeof(*bref));
776 bref->data_off = *basep | radix;
777 bref->vradix = radix;
779 *basep += 1U << radix;
783 * Borrow HAMMER1's directory hash algorithm #1 with a few modifications.
784 * The filename is split into fields which are hashed separately and then
787 * Differences include: bit 63 must be set to 1 for HAMMER2 (HAMMER1 sets
788 * it to 0), this is because bit63=0 is used for hidden hardlinked inodes.
789 * (This means we do not need to do a 0-check/or-with-0x100000000 either).
791 * Also, the iscsi crc code is used instead of the old crc32 code.
794 dirhash(const unsigned char *name, size_t len)
796 const unsigned char *aname = name;
803 * Filesystem version 6 or better will create directories
804 * using the ALG1 dirhash. This hash breaks the filename
805 * up into domains separated by special characters and
806 * hashes each domain independently.
808 * We also do a simple sub-sort using the first character
809 * of the filename in the top 5-bits.
817 for (i = j = 0; i < len; ++i) {
818 if (aname[i] == '.' ||
823 crcx += hammer2_icrc32(aname + j, i - j);
828 crcx += hammer2_icrc32(aname + j, i - j);
831 * The directory hash utilizes the top 32 bits of the 64-bit key.
832 * Bit 63 must be set to 1.
835 key |= (uint64_t)crcx << 32;
838 * l16 - crc of entire filename
840 * This crc reduces degenerate hash collision conditions
842 crcx = hammer2_icrc32(aname, len);
843 crcx = crcx ^ (crcx << 16);
844 key |= crcx & 0xFFFF0000U;
847 * Set bit 15. This allows readdir to strip bit 63 so a positive
848 * 64-bit cookie/offset can always be returned, and still guarantee
849 * that the values 0x0000-0x7FFF are available for artificial entries.
858 blkrefary_cmp(const void *b1, const void *b2)
860 const hammer2_blockref_t *bref1 = b1;
861 const hammer2_blockref_t *bref2 = b2;
862 if (bref1->key < bref2->key)
864 if (bref1->key > bref2->key)