| File: | src/usr.sbin/vmd/vioqcow2.c |
| Warning: | line 503, column 2 Value stored to 'cluster' is never read |
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| 1 | /* $OpenBSD: vioqcow2.c,v 1.17 2022/01/04 15:21:40 claudio Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2018 Ori Bernstein <ori@eigenstate.org> |
| 5 | * |
| 6 | * Permission to use, copy, modify, and distribute this software for any |
| 7 | * purpose with or without fee is hereby granted, provided that the above |
| 8 | * copyright notice and this permission notice appear in all copies. |
| 9 | * |
| 10 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 11 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 12 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| 13 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 14 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 15 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| 16 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 17 | */ |
| 18 | |
| 19 | #include <sys/types.h> |
| 20 | #include <sys/stat.h> |
| 21 | |
| 22 | #include <dev/pci/pcireg.h> |
| 23 | #include <machine/vmmvar.h> |
| 24 | |
| 25 | #include <assert.h> |
| 26 | #include <err.h> |
| 27 | #include <errno(*__errno()).h> |
| 28 | #include <fcntl.h> |
| 29 | #include <libgen.h> |
| 30 | #include <stdlib.h> |
| 31 | #include <string.h> |
| 32 | #include <unistd.h> |
| 33 | |
| 34 | #include "virtio.h" |
| 35 | |
| 36 | #define QCOW2_COMPRESSED0x4000000000000000ull 0x4000000000000000ull |
| 37 | #define QCOW2_INPLACE0x8000000000000000ull 0x8000000000000000ull |
| 38 | |
| 39 | #define QCOW2_DIRTY(1 << 0) (1 << 0) |
| 40 | #define QCOW2_CORRUPT(1 << 1) (1 << 1) |
| 41 | |
| 42 | enum { |
| 43 | ICFEATURE_DIRTY = 1 << 0, |
| 44 | ICFEATURE_CORRUPT = 1 << 1, |
| 45 | }; |
| 46 | |
| 47 | enum { |
| 48 | ACFEATURE_BITEXT = 1 << 0, |
| 49 | }; |
| 50 | |
| 51 | struct qcheader { |
| 52 | char magic[4]; |
| 53 | uint32_t version; |
| 54 | uint64_t backingoff; |
| 55 | uint32_t backingsz; |
| 56 | uint32_t clustershift; |
| 57 | uint64_t disksz; |
| 58 | uint32_t cryptmethod; |
| 59 | uint32_t l1sz; |
| 60 | uint64_t l1off; |
| 61 | uint64_t refoff; |
| 62 | uint32_t refsz; |
| 63 | uint32_t snapcount; |
| 64 | uint64_t snapsz; |
| 65 | /* v3 additions */ |
| 66 | uint64_t incompatfeatures; |
| 67 | uint64_t compatfeatures; |
| 68 | uint64_t autoclearfeatures; |
| 69 | uint32_t reforder; /* Bits = 1 << reforder */ |
| 70 | uint32_t headersz; |
| 71 | } __packed__attribute__((__packed__)); |
| 72 | |
| 73 | struct qcdisk { |
| 74 | pthread_rwlock_t lock; |
| 75 | struct qcdisk *base; |
| 76 | struct qcheader header; |
| 77 | |
| 78 | int fd; |
| 79 | uint64_t *l1; |
| 80 | off_t end; |
| 81 | off_t clustersz; |
| 82 | off_t disksz; /* In bytes */ |
| 83 | uint32_t cryptmethod; |
| 84 | |
| 85 | uint32_t l1sz; |
| 86 | off_t l1off; |
| 87 | |
| 88 | off_t refoff; |
| 89 | off_t refsz; |
| 90 | |
| 91 | uint32_t nsnap; |
| 92 | off_t snapoff; |
| 93 | |
| 94 | /* v3 features */ |
| 95 | uint64_t incompatfeatures; |
| 96 | uint64_t autoclearfeatures; |
| 97 | uint32_t refssz; |
| 98 | uint32_t headersz; |
| 99 | }; |
| 100 | |
| 101 | extern char *__progname; |
| 102 | |
| 103 | static off_t xlate(struct qcdisk *, off_t, int *); |
| 104 | static void copy_cluster(struct qcdisk *, struct qcdisk *, off_t, off_t); |
| 105 | static void inc_refs(struct qcdisk *, off_t, int); |
| 106 | static off_t mkcluster(struct qcdisk *, struct qcdisk *, off_t, off_t); |
| 107 | static int qc2_open(struct qcdisk *, int *, size_t); |
| 108 | static ssize_t qc2_pread(void *, char *, size_t, off_t); |
| 109 | static ssize_t qc2_pwrite(void *, char *, size_t, off_t); |
| 110 | static void qc2_close(void *, int); |
| 111 | |
| 112 | /* |
| 113 | * Initializes a raw disk image backing file from an fd. |
| 114 | * Stores the number of 512 byte sectors in *szp, |
| 115 | * returning -1 for error, 0 for success. |
| 116 | * |
| 117 | * May open snapshot base images. |
| 118 | */ |
| 119 | int |
| 120 | virtio_qcow2_init(struct virtio_backing *file, off_t *szp, int *fd, size_t nfd) |
| 121 | { |
| 122 | struct qcdisk *diskp; |
| 123 | |
| 124 | diskp = malloc(sizeof(struct qcdisk)); |
| 125 | if (diskp == NULL((void *)0)) |
| 126 | return -1; |
| 127 | if (qc2_open(diskp, fd, nfd) == -1) { |
| 128 | log_warnx("could not open qcow2 disk"); |
| 129 | return -1; |
| 130 | } |
| 131 | file->p = diskp; |
| 132 | file->pread = qc2_pread; |
| 133 | file->pwrite = qc2_pwrite; |
| 134 | file->close = qc2_close; |
| 135 | *szp = diskp->disksz; |
| 136 | return 0; |
| 137 | } |
| 138 | |
| 139 | /* |
| 140 | * Return the path to the base image given a disk image. |
| 141 | * Called from vmctl. |
| 142 | */ |
| 143 | ssize_t |
| 144 | virtio_qcow2_get_base(int fd, char *path, size_t npath, const char *dpath) |
| 145 | { |
| 146 | char dpathbuf[PATH_MAX1024]; |
| 147 | char expanded[PATH_MAX1024]; |
| 148 | struct qcheader header; |
| 149 | uint64_t backingoff; |
| 150 | uint32_t backingsz; |
| 151 | char *s = NULL((void *)0); |
| 152 | |
| 153 | if (pread(fd, &header, sizeof(header), 0) != sizeof(header)) { |
| 154 | log_warnx("short read on header"); |
| 155 | return -1; |
| 156 | } |
| 157 | if (strncmp(header.magic, VM_MAGIC_QCOW"QFI\xfb", strlen(VM_MAGIC_QCOW"QFI\xfb")) != 0) { |
| 158 | log_warnx("invalid magic numbers"); |
| 159 | return -1; |
| 160 | } |
| 161 | backingoff = be64toh(header.backingoff)(__uint64_t)(__builtin_constant_p(header.backingoff) ? (__uint64_t )((((__uint64_t)(header.backingoff) & 0xff) << 56) | ((__uint64_t)(header.backingoff) & 0xff00ULL) << 40 | ((__uint64_t)(header.backingoff) & 0xff0000ULL) << 24 | ((__uint64_t)(header.backingoff) & 0xff000000ULL) << 8 | ((__uint64_t)(header.backingoff) & 0xff00000000ULL) >> 8 | ((__uint64_t)(header.backingoff) & 0xff0000000000ULL ) >> 24 | ((__uint64_t)(header.backingoff) & 0xff000000000000ULL ) >> 40 | ((__uint64_t)(header.backingoff) & 0xff00000000000000ULL ) >> 56) : __swap64md(header.backingoff)); |
| 162 | backingsz = be32toh(header.backingsz)(__uint32_t)(__builtin_constant_p(header.backingsz) ? (__uint32_t )(((__uint32_t)(header.backingsz) & 0xff) << 24 | ( (__uint32_t)(header.backingsz) & 0xff00) << 8 | ((__uint32_t )(header.backingsz) & 0xff0000) >> 8 | ((__uint32_t )(header.backingsz) & 0xff000000) >> 24) : __swap32md (header.backingsz)); |
| 163 | if (backingsz == 0) |
| 164 | return 0; |
| 165 | |
| 166 | if (backingsz >= npath - 1) { |
| 167 | log_warnx("snapshot path too long"); |
| 168 | return -1; |
| 169 | } |
| 170 | if (pread(fd, path, backingsz, backingoff) != backingsz) { |
| 171 | log_warnx("could not read snapshot base name"); |
| 172 | return -1; |
| 173 | } |
| 174 | path[backingsz] = '\0'; |
| 175 | |
| 176 | /* |
| 177 | * Relative paths should be interpreted relative to the disk image, |
| 178 | * rather than relative to the directory vmd happens to be running in, |
| 179 | * since this is the only userful interpretation. |
| 180 | */ |
| 181 | if (path[0] == '/') { |
| 182 | if (realpath(path, expanded) == NULL((void *)0) || |
| 183 | strlcpy(path, expanded, npath) >= npath) { |
| 184 | log_warnx("unable to resolve %s", path); |
| 185 | return -1; |
| 186 | } |
| 187 | } else { |
| 188 | if (strlcpy(dpathbuf, dpath, sizeof(dpathbuf)) >= |
| 189 | sizeof(dpathbuf)) { |
| 190 | log_warnx("path too long: %s", dpath); |
| 191 | return -1; |
| 192 | } |
| 193 | s = dirname(dpathbuf); |
| 194 | if (snprintf(expanded, sizeof(expanded), |
| 195 | "%s/%s", s, path) >= (int)sizeof(expanded)) { |
| 196 | log_warnx("path too long: %s/%s", s, path); |
| 197 | return -1; |
| 198 | } |
| 199 | if (npath < PATH_MAX1024 || |
| 200 | realpath(expanded, path) == NULL((void *)0)) { |
| 201 | log_warnx("unable to resolve %s", path); |
| 202 | return -1; |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | return strlen(path); |
| 207 | } |
| 208 | |
| 209 | static int |
| 210 | qc2_open(struct qcdisk *disk, int *fds, size_t nfd) |
| 211 | { |
| 212 | char basepath[PATH_MAX1024]; |
| 213 | struct stat st; |
| 214 | struct qcheader header; |
| 215 | uint64_t backingoff; |
| 216 | uint32_t backingsz; |
| 217 | off_t i; |
| 218 | int version, fd; |
| 219 | |
| 220 | pthread_rwlock_init(&disk->lock, NULL((void *)0)); |
| 221 | fd = fds[0]; |
| 222 | disk->fd = fd; |
| 223 | disk->base = NULL((void *)0); |
| 224 | disk->l1 = NULL((void *)0); |
| 225 | |
| 226 | if (pread(fd, &header, sizeof(header), 0) != sizeof(header)) |
| 227 | fatalx("short read on header"); |
| 228 | if (strncmp(header.magic, VM_MAGIC_QCOW"QFI\xfb", strlen(VM_MAGIC_QCOW"QFI\xfb")) != 0) |
| 229 | fatalx("invalid magic numbers"); |
| 230 | |
| 231 | disk->clustersz = (1ull << be32toh(header.clustershift)(__uint32_t)(__builtin_constant_p(header.clustershift) ? (__uint32_t )(((__uint32_t)(header.clustershift) & 0xff) << 24 | ((__uint32_t)(header.clustershift) & 0xff00) << 8 | ((__uint32_t)(header.clustershift) & 0xff0000) >> 8 | ((__uint32_t)(header.clustershift) & 0xff000000) >> 24) : __swap32md(header.clustershift))); |
| 232 | disk->disksz = be64toh(header.disksz)(__uint64_t)(__builtin_constant_p(header.disksz) ? (__uint64_t )((((__uint64_t)(header.disksz) & 0xff) << 56) | (( __uint64_t)(header.disksz) & 0xff00ULL) << 40 | ((__uint64_t )(header.disksz) & 0xff0000ULL) << 24 | ((__uint64_t )(header.disksz) & 0xff000000ULL) << 8 | ((__uint64_t )(header.disksz) & 0xff00000000ULL) >> 8 | ((__uint64_t )(header.disksz) & 0xff0000000000ULL) >> 24 | ((__uint64_t )(header.disksz) & 0xff000000000000ULL) >> 40 | ((__uint64_t )(header.disksz) & 0xff00000000000000ULL) >> 56) : __swap64md (header.disksz)); |
| 233 | disk->cryptmethod = be32toh(header.cryptmethod)(__uint32_t)(__builtin_constant_p(header.cryptmethod) ? (__uint32_t )(((__uint32_t)(header.cryptmethod) & 0xff) << 24 | ((__uint32_t)(header.cryptmethod) & 0xff00) << 8 | ((__uint32_t)(header.cryptmethod) & 0xff0000) >> 8 | ((__uint32_t)(header.cryptmethod) & 0xff000000) >> 24) : __swap32md(header.cryptmethod)); |
| 234 | disk->l1sz = be32toh(header.l1sz)(__uint32_t)(__builtin_constant_p(header.l1sz) ? (__uint32_t) (((__uint32_t)(header.l1sz) & 0xff) << 24 | ((__uint32_t )(header.l1sz) & 0xff00) << 8 | ((__uint32_t)(header .l1sz) & 0xff0000) >> 8 | ((__uint32_t)(header.l1sz ) & 0xff000000) >> 24) : __swap32md(header.l1sz)); |
| 235 | disk->l1off = be64toh(header.l1off)(__uint64_t)(__builtin_constant_p(header.l1off) ? (__uint64_t )((((__uint64_t)(header.l1off) & 0xff) << 56) | ((__uint64_t )(header.l1off) & 0xff00ULL) << 40 | ((__uint64_t)( header.l1off) & 0xff0000ULL) << 24 | ((__uint64_t)( header.l1off) & 0xff000000ULL) << 8 | ((__uint64_t) (header.l1off) & 0xff00000000ULL) >> 8 | ((__uint64_t )(header.l1off) & 0xff0000000000ULL) >> 24 | ((__uint64_t )(header.l1off) & 0xff000000000000ULL) >> 40 | ((__uint64_t )(header.l1off) & 0xff00000000000000ULL) >> 56) : __swap64md (header.l1off)); |
| 236 | disk->refsz = be32toh(header.refsz)(__uint32_t)(__builtin_constant_p(header.refsz) ? (__uint32_t )(((__uint32_t)(header.refsz) & 0xff) << 24 | ((__uint32_t )(header.refsz) & 0xff00) << 8 | ((__uint32_t)(header .refsz) & 0xff0000) >> 8 | ((__uint32_t)(header.refsz ) & 0xff000000) >> 24) : __swap32md(header.refsz)); |
| 237 | disk->refoff = be64toh(header.refoff)(__uint64_t)(__builtin_constant_p(header.refoff) ? (__uint64_t )((((__uint64_t)(header.refoff) & 0xff) << 56) | (( __uint64_t)(header.refoff) & 0xff00ULL) << 40 | ((__uint64_t )(header.refoff) & 0xff0000ULL) << 24 | ((__uint64_t )(header.refoff) & 0xff000000ULL) << 8 | ((__uint64_t )(header.refoff) & 0xff00000000ULL) >> 8 | ((__uint64_t )(header.refoff) & 0xff0000000000ULL) >> 24 | ((__uint64_t )(header.refoff) & 0xff000000000000ULL) >> 40 | ((__uint64_t )(header.refoff) & 0xff00000000000000ULL) >> 56) : __swap64md (header.refoff)); |
| 238 | disk->nsnap = be32toh(header.snapcount)(__uint32_t)(__builtin_constant_p(header.snapcount) ? (__uint32_t )(((__uint32_t)(header.snapcount) & 0xff) << 24 | ( (__uint32_t)(header.snapcount) & 0xff00) << 8 | ((__uint32_t )(header.snapcount) & 0xff0000) >> 8 | ((__uint32_t )(header.snapcount) & 0xff000000) >> 24) : __swap32md (header.snapcount)); |
| 239 | disk->snapoff = be64toh(header.snapsz)(__uint64_t)(__builtin_constant_p(header.snapsz) ? (__uint64_t )((((__uint64_t)(header.snapsz) & 0xff) << 56) | (( __uint64_t)(header.snapsz) & 0xff00ULL) << 40 | ((__uint64_t )(header.snapsz) & 0xff0000ULL) << 24 | ((__uint64_t )(header.snapsz) & 0xff000000ULL) << 8 | ((__uint64_t )(header.snapsz) & 0xff00000000ULL) >> 8 | ((__uint64_t )(header.snapsz) & 0xff0000000000ULL) >> 24 | ((__uint64_t )(header.snapsz) & 0xff000000000000ULL) >> 40 | ((__uint64_t )(header.snapsz) & 0xff00000000000000ULL) >> 56) : __swap64md (header.snapsz)); |
| 240 | |
| 241 | /* |
| 242 | * The additional features here are defined as 0 in the v2 format, |
| 243 | * so as long as we clear the buffer before parsing, we don't need |
| 244 | * to check versions here. |
| 245 | */ |
| 246 | disk->incompatfeatures = be64toh(header.incompatfeatures)(__uint64_t)(__builtin_constant_p(header.incompatfeatures) ? ( __uint64_t)((((__uint64_t)(header.incompatfeatures) & 0xff ) << 56) | ((__uint64_t)(header.incompatfeatures) & 0xff00ULL) << 40 | ((__uint64_t)(header.incompatfeatures ) & 0xff0000ULL) << 24 | ((__uint64_t)(header.incompatfeatures ) & 0xff000000ULL) << 8 | ((__uint64_t)(header.incompatfeatures ) & 0xff00000000ULL) >> 8 | ((__uint64_t)(header.incompatfeatures ) & 0xff0000000000ULL) >> 24 | ((__uint64_t)(header .incompatfeatures) & 0xff000000000000ULL) >> 40 | ( (__uint64_t)(header.incompatfeatures) & 0xff00000000000000ULL ) >> 56) : __swap64md(header.incompatfeatures)); |
| 247 | disk->autoclearfeatures = be64toh(header.autoclearfeatures)(__uint64_t)(__builtin_constant_p(header.autoclearfeatures) ? (__uint64_t)((((__uint64_t)(header.autoclearfeatures) & 0xff ) << 56) | ((__uint64_t)(header.autoclearfeatures) & 0xff00ULL) << 40 | ((__uint64_t)(header.autoclearfeatures ) & 0xff0000ULL) << 24 | ((__uint64_t)(header.autoclearfeatures ) & 0xff000000ULL) << 8 | ((__uint64_t)(header.autoclearfeatures ) & 0xff00000000ULL) >> 8 | ((__uint64_t)(header.autoclearfeatures ) & 0xff0000000000ULL) >> 24 | ((__uint64_t)(header .autoclearfeatures) & 0xff000000000000ULL) >> 40 | ( (__uint64_t)(header.autoclearfeatures) & 0xff00000000000000ULL ) >> 56) : __swap64md(header.autoclearfeatures)); |
| 248 | disk->refssz = be32toh(header.refsz)(__uint32_t)(__builtin_constant_p(header.refsz) ? (__uint32_t )(((__uint32_t)(header.refsz) & 0xff) << 24 | ((__uint32_t )(header.refsz) & 0xff00) << 8 | ((__uint32_t)(header .refsz) & 0xff0000) >> 8 | ((__uint32_t)(header.refsz ) & 0xff000000) >> 24) : __swap32md(header.refsz)); |
| 249 | disk->headersz = be32toh(header.headersz)(__uint32_t)(__builtin_constant_p(header.headersz) ? (__uint32_t )(((__uint32_t)(header.headersz) & 0xff) << 24 | (( __uint32_t)(header.headersz) & 0xff00) << 8 | ((__uint32_t )(header.headersz) & 0xff0000) >> 8 | ((__uint32_t) (header.headersz) & 0xff000000) >> 24) : __swap32md (header.headersz)); |
| 250 | |
| 251 | /* |
| 252 | * We only know about the dirty or corrupt bits here. |
| 253 | */ |
| 254 | if (disk->incompatfeatures & ~(QCOW2_DIRTY(1 << 0)|QCOW2_CORRUPT(1 << 1))) |
| 255 | fatalx("unsupported features %llx", |
| 256 | disk->incompatfeatures & ~(QCOW2_DIRTY(1 << 0)|QCOW2_CORRUPT(1 << 1))); |
| 257 | if (be32toh(header.reforder)(__uint32_t)(__builtin_constant_p(header.reforder) ? (__uint32_t )(((__uint32_t)(header.reforder) & 0xff) << 24 | (( __uint32_t)(header.reforder) & 0xff00) << 8 | ((__uint32_t )(header.reforder) & 0xff0000) >> 8 | ((__uint32_t) (header.reforder) & 0xff000000) >> 24) : __swap32md (header.reforder)) != 4) |
| 258 | fatalx("unsupported refcount size\n"); |
| 259 | |
| 260 | disk->l1 = calloc(disk->l1sz, sizeof(*disk->l1)); |
| 261 | if (!disk->l1) |
| 262 | fatal("%s: could not allocate l1 table", __func__); |
| 263 | if (pread(disk->fd, disk->l1, 8 * disk->l1sz, disk->l1off) |
| 264 | != 8 * disk->l1sz) |
| 265 | fatalx("%s: unable to read qcow2 L1 table", __func__); |
| 266 | for (i = 0; i < disk->l1sz; i++) |
| 267 | disk->l1[i] = be64toh(disk->l1[i])(__uint64_t)(__builtin_constant_p(disk->l1[i]) ? (__uint64_t )((((__uint64_t)(disk->l1[i]) & 0xff) << 56) | ( (__uint64_t)(disk->l1[i]) & 0xff00ULL) << 40 | ( (__uint64_t)(disk->l1[i]) & 0xff0000ULL) << 24 | ((__uint64_t)(disk->l1[i]) & 0xff000000ULL) << 8 | ((__uint64_t)(disk->l1[i]) & 0xff00000000ULL) >> 8 | ((__uint64_t)(disk->l1[i]) & 0xff0000000000ULL) >> 24 | ((__uint64_t)(disk->l1[i]) & 0xff000000000000ULL ) >> 40 | ((__uint64_t)(disk->l1[i]) & 0xff00000000000000ULL ) >> 56) : __swap64md(disk->l1[i])); |
| 268 | version = be32toh(header.version)(__uint32_t)(__builtin_constant_p(header.version) ? (__uint32_t )(((__uint32_t)(header.version) & 0xff) << 24 | ((__uint32_t )(header.version) & 0xff00) << 8 | ((__uint32_t)(header .version) & 0xff0000) >> 8 | ((__uint32_t)(header.version ) & 0xff000000) >> 24) : __swap32md(header.version) ); |
| 269 | if (version != 2 && version != 3) |
| 270 | fatalx("%s: unknown qcow2 version %d", __func__, version); |
| 271 | |
| 272 | backingoff = be64toh(header.backingoff)(__uint64_t)(__builtin_constant_p(header.backingoff) ? (__uint64_t )((((__uint64_t)(header.backingoff) & 0xff) << 56) | ((__uint64_t)(header.backingoff) & 0xff00ULL) << 40 | ((__uint64_t)(header.backingoff) & 0xff0000ULL) << 24 | ((__uint64_t)(header.backingoff) & 0xff000000ULL) << 8 | ((__uint64_t)(header.backingoff) & 0xff00000000ULL) >> 8 | ((__uint64_t)(header.backingoff) & 0xff0000000000ULL ) >> 24 | ((__uint64_t)(header.backingoff) & 0xff000000000000ULL ) >> 40 | ((__uint64_t)(header.backingoff) & 0xff00000000000000ULL ) >> 56) : __swap64md(header.backingoff)); |
| 273 | backingsz = be32toh(header.backingsz)(__uint32_t)(__builtin_constant_p(header.backingsz) ? (__uint32_t )(((__uint32_t)(header.backingsz) & 0xff) << 24 | ( (__uint32_t)(header.backingsz) & 0xff00) << 8 | ((__uint32_t )(header.backingsz) & 0xff0000) >> 8 | ((__uint32_t )(header.backingsz) & 0xff000000) >> 24) : __swap32md (header.backingsz)); |
| 274 | if (backingsz != 0) { |
| 275 | if (backingsz >= sizeof(basepath) - 1) { |
| 276 | fatalx("%s: snapshot path too long", __func__); |
| 277 | } |
| 278 | if (pread(fd, basepath, backingsz, backingoff) != backingsz) { |
| 279 | fatalx("%s: could not read snapshot base name", |
| 280 | __func__); |
| 281 | } |
| 282 | basepath[backingsz] = 0; |
| 283 | if (nfd <= 1) { |
| 284 | fatalx("%s: missing base image %s", __func__, |
| 285 | basepath); |
| 286 | } |
| 287 | |
| 288 | |
| 289 | disk->base = calloc(1, sizeof(struct qcdisk)); |
| 290 | if (!disk->base) |
| 291 | fatal("%s: could not open %s", __func__, basepath); |
| 292 | if (qc2_open(disk->base, fds + 1, nfd - 1) == -1) |
| 293 | fatalx("%s: could not open %s", __func__, basepath); |
| 294 | if (disk->base->clustersz != disk->clustersz) |
| 295 | fatalx("%s: all disk parts must share clustersize", |
| 296 | __func__); |
| 297 | } |
| 298 | if (fstat(fd, &st) == -1) |
| 299 | fatal("%s: unable to stat disk", __func__); |
| 300 | |
| 301 | disk->end = st.st_size; |
| 302 | |
| 303 | log_debug("%s: qcow2 disk version %d size %lld end %lld snap %d", |
| 304 | __func__, version, disk->disksz, disk->end, disk->nsnap); |
| 305 | |
| 306 | return 0; |
| 307 | } |
| 308 | |
| 309 | static ssize_t |
| 310 | qc2_pread(void *p, char *buf, size_t len, off_t off) |
| 311 | { |
| 312 | struct qcdisk *disk, *d; |
| 313 | off_t phys_off, end, cluster_off; |
| 314 | ssize_t sz, rem; |
| 315 | |
| 316 | disk = p; |
| 317 | end = off + len; |
| 318 | if (off < 0 || end > disk->disksz) |
| 319 | return -1; |
| 320 | |
| 321 | /* handle head chunk separately */ |
| 322 | rem = len; |
| 323 | while (off != end) { |
| 324 | for (d = disk; d; d = d->base) |
| 325 | if ((phys_off = xlate(d, off, NULL((void *)0))) > 0) |
| 326 | break; |
| 327 | /* Break out into chunks. This handles |
| 328 | * three cases: |
| 329 | * |
| 330 | * |----+====|========|====+-----| |
| 331 | * |
| 332 | * Either we are at the start of the read, |
| 333 | * and the cluster has some leading bytes. |
| 334 | * This means that we are reading the tail |
| 335 | * of the cluster, and our size is: |
| 336 | * |
| 337 | * clustersz - (off % clustersz). |
| 338 | * |
| 339 | * Otherwise, we're reading the middle section. |
| 340 | * We're already aligned here, so we can just |
| 341 | * read the whole cluster size. Or we're at the |
| 342 | * tail, at which point we just want to read the |
| 343 | * remaining bytes. |
| 344 | */ |
| 345 | cluster_off = off % disk->clustersz; |
| 346 | sz = disk->clustersz - cluster_off; |
| 347 | if (sz > rem) |
| 348 | sz = rem; |
| 349 | /* |
| 350 | * If we're within the disk, but don't have backing bytes, |
| 351 | * just read back zeros. |
| 352 | */ |
| 353 | if (!d) |
| 354 | bzero(buf, sz); |
| 355 | else if (pread(d->fd, buf, sz, phys_off) != sz) |
| 356 | return -1; |
| 357 | off += sz; |
| 358 | buf += sz; |
| 359 | rem -= sz; |
| 360 | } |
| 361 | return len; |
| 362 | } |
| 363 | |
| 364 | ssize_t |
| 365 | qc2_pwrite(void *p, char *buf, size_t len, off_t off) |
| 366 | { |
| 367 | struct qcdisk *disk, *d; |
| 368 | off_t phys_off, cluster_off, end; |
| 369 | ssize_t sz, rem; |
| 370 | int inplace; |
| 371 | |
| 372 | d = p; |
| 373 | disk = p; |
| 374 | inplace = 1; |
| 375 | end = off + len; |
| 376 | if (off < 0 || end > disk->disksz) |
| 377 | return -1; |
| 378 | rem = len; |
| 379 | while (off != end) { |
| 380 | /* See the read code for a summary of the computation */ |
| 381 | cluster_off = off % disk->clustersz; |
| 382 | sz = disk->clustersz - cluster_off; |
| 383 | if (sz > rem) |
| 384 | sz = rem; |
| 385 | |
| 386 | phys_off = xlate(disk, off, &inplace); |
| 387 | if (phys_off == -1) |
| 388 | return -1; |
| 389 | /* |
| 390 | * If we couldn't find the cluster in the writable disk, |
| 391 | * see if it exists in the base image. If it does, we |
| 392 | * need to copy it before the write. The copy happens |
| 393 | * in the '!inplace' if clause below te search. |
| 394 | */ |
| 395 | if (phys_off == 0) |
| 396 | for (d = disk->base; d; d = d->base) |
| 397 | if ((phys_off = xlate(d, off, NULL((void *)0))) > 0) |
| 398 | break; |
| 399 | if (!inplace || phys_off == 0) |
| 400 | phys_off = mkcluster(disk, d, off, phys_off); |
| 401 | if (phys_off == -1) |
| 402 | return -1; |
| 403 | if (phys_off < disk->clustersz) |
| 404 | fatalx("%s: writing reserved cluster", __func__); |
| 405 | if (pwrite(disk->fd, buf, sz, phys_off) != sz) |
| 406 | return -1; |
| 407 | off += sz; |
| 408 | buf += sz; |
| 409 | rem -= sz; |
| 410 | } |
| 411 | return len; |
| 412 | } |
| 413 | |
| 414 | static void |
| 415 | qc2_close(void *p, int stayopen) |
| 416 | { |
| 417 | struct qcdisk *disk; |
| 418 | |
| 419 | disk = p; |
| 420 | if (disk->base) |
| 421 | qc2_close(disk->base, stayopen); |
| 422 | if (!stayopen) |
| 423 | close(disk->fd); |
| 424 | free(disk->l1); |
| 425 | free(disk); |
| 426 | } |
| 427 | |
| 428 | /* |
| 429 | * Translates a virtual offset into an on-disk offset. |
| 430 | * Returns: |
| 431 | * -1 on error |
| 432 | * 0 on 'not found' |
| 433 | * >0 on found |
| 434 | */ |
| 435 | static off_t |
| 436 | xlate(struct qcdisk *disk, off_t off, int *inplace) |
| 437 | { |
| 438 | off_t l2sz, l1off, l2tab, l2off, cluster, clusteroff; |
| 439 | uint64_t buf; |
| 440 | |
| 441 | |
| 442 | /* |
| 443 | * Clear out inplace flag -- xlate misses should not |
| 444 | * be flagged as updatable in place. We will still |
| 445 | * return 0 from them, but this leaves less surprises |
| 446 | * in the API. |
| 447 | */ |
| 448 | if (inplace) |
| 449 | *inplace = 0; |
| 450 | pthread_rwlock_rdlock(&disk->lock); |
| 451 | if (off < 0) |
| 452 | goto err; |
| 453 | |
| 454 | l2sz = disk->clustersz / 8; |
| 455 | l1off = (off / disk->clustersz) / l2sz; |
| 456 | if (l1off >= disk->l1sz) |
| 457 | goto err; |
| 458 | |
| 459 | l2tab = disk->l1[l1off]; |
| 460 | l2tab &= ~QCOW2_INPLACE0x8000000000000000ull; |
| 461 | if (l2tab == 0) { |
| 462 | pthread_rwlock_unlock(&disk->lock); |
| 463 | return 0; |
| 464 | } |
| 465 | l2off = (off / disk->clustersz) % l2sz; |
| 466 | pread(disk->fd, &buf, sizeof(buf), l2tab + l2off * 8); |
| 467 | cluster = be64toh(buf)(__uint64_t)(__builtin_constant_p(buf) ? (__uint64_t)((((__uint64_t )(buf) & 0xff) << 56) | ((__uint64_t)(buf) & 0xff00ULL ) << 40 | ((__uint64_t)(buf) & 0xff0000ULL) << 24 | ((__uint64_t)(buf) & 0xff000000ULL) << 8 | (( __uint64_t)(buf) & 0xff00000000ULL) >> 8 | ((__uint64_t )(buf) & 0xff0000000000ULL) >> 24 | ((__uint64_t)(buf ) & 0xff000000000000ULL) >> 40 | ((__uint64_t)(buf) & 0xff00000000000000ULL) >> 56) : __swap64md(buf)); |
| 468 | /* |
| 469 | * cluster may be 0, but all future operations don't affect |
| 470 | * the return value. |
| 471 | */ |
| 472 | if (inplace) |
| 473 | *inplace = !!(cluster & QCOW2_INPLACE0x8000000000000000ull); |
| 474 | if (cluster & QCOW2_COMPRESSED0x4000000000000000ull) |
| 475 | fatalx("%s: compressed clusters unsupported", __func__); |
| 476 | pthread_rwlock_unlock(&disk->lock); |
| 477 | clusteroff = 0; |
| 478 | cluster &= ~QCOW2_INPLACE0x8000000000000000ull; |
| 479 | if (cluster) |
| 480 | clusteroff = off % disk->clustersz; |
| 481 | return cluster + clusteroff; |
| 482 | err: |
| 483 | pthread_rwlock_unlock(&disk->lock); |
| 484 | return -1; |
| 485 | } |
| 486 | |
| 487 | /* |
| 488 | * Allocates a new cluster on disk, creating a new L2 table |
| 489 | * if needed. The cluster starts off with a refs of one, |
| 490 | * and the writable bit set. |
| 491 | * |
| 492 | * Returns -1 on error, and the physical address within the |
| 493 | * cluster of the write offset if it exists. |
| 494 | */ |
| 495 | static off_t |
| 496 | mkcluster(struct qcdisk *disk, struct qcdisk *base, off_t off, off_t src_phys) |
| 497 | { |
| 498 | off_t l2sz, l1off, l2tab, l2off, cluster, clusteroff, orig; |
| 499 | uint64_t buf; |
| 500 | |
| 501 | pthread_rwlock_wrlock(&disk->lock); |
| 502 | |
| 503 | cluster = -1; |
Value stored to 'cluster' is never read | |
| 504 | /* L1 entries always exist */ |
| 505 | l2sz = disk->clustersz / 8; |
| 506 | l1off = off / (disk->clustersz * l2sz); |
| 507 | if (l1off >= disk->l1sz) |
| 508 | fatalx("l1 offset outside disk"); |
| 509 | |
| 510 | disk->end = (disk->end + disk->clustersz - 1) & ~(disk->clustersz - 1); |
| 511 | |
| 512 | l2tab = disk->l1[l1off]; |
| 513 | l2off = (off / disk->clustersz) % l2sz; |
| 514 | /* We may need to create or clone an L2 entry to map the block */ |
| 515 | if (l2tab == 0 || (l2tab & QCOW2_INPLACE0x8000000000000000ull) == 0) { |
| 516 | orig = l2tab & ~QCOW2_INPLACE0x8000000000000000ull; |
| 517 | l2tab = disk->end; |
| 518 | disk->end += disk->clustersz; |
| 519 | if (ftruncate(disk->fd, disk->end) == -1) |
| 520 | fatal("%s: ftruncate failed", __func__); |
| 521 | |
| 522 | /* |
| 523 | * If we translated, found a L2 entry, but it needed to |
| 524 | * be copied, copy it. |
| 525 | */ |
| 526 | if (orig != 0) |
| 527 | copy_cluster(disk, disk, l2tab, orig); |
| 528 | /* Update l1 -- we flush it later */ |
| 529 | disk->l1[l1off] = l2tab | QCOW2_INPLACE0x8000000000000000ull; |
| 530 | inc_refs(disk, l2tab, 1); |
| 531 | } |
| 532 | l2tab &= ~QCOW2_INPLACE0x8000000000000000ull; |
| 533 | |
| 534 | /* Grow the disk */ |
| 535 | if (ftruncate(disk->fd, disk->end + disk->clustersz) < 0) |
| 536 | fatalx("%s: could not grow disk", __func__); |
| 537 | if (src_phys > 0) |
| 538 | copy_cluster(disk, base, disk->end, src_phys); |
| 539 | cluster = disk->end; |
| 540 | disk->end += disk->clustersz; |
| 541 | buf = htobe64(cluster | QCOW2_INPLACE)(__uint64_t)(__builtin_constant_p(cluster | 0x8000000000000000ull ) ? (__uint64_t)((((__uint64_t)(cluster | 0x8000000000000000ull ) & 0xff) << 56) | ((__uint64_t)(cluster | 0x8000000000000000ull ) & 0xff00ULL) << 40 | ((__uint64_t)(cluster | 0x8000000000000000ull ) & 0xff0000ULL) << 24 | ((__uint64_t)(cluster | 0x8000000000000000ull ) & 0xff000000ULL) << 8 | ((__uint64_t)(cluster | 0x8000000000000000ull ) & 0xff00000000ULL) >> 8 | ((__uint64_t)(cluster | 0x8000000000000000ull) & 0xff0000000000ULL) >> 24 | ((__uint64_t)(cluster | 0x8000000000000000ull) & 0xff000000000000ULL ) >> 40 | ((__uint64_t)(cluster | 0x8000000000000000ull ) & 0xff00000000000000ULL) >> 56) : __swap64md(cluster | 0x8000000000000000ull)); |
| 542 | if (pwrite(disk->fd, &buf, sizeof(buf), l2tab + l2off * 8) != 8) |
| 543 | fatalx("%s: could not write cluster", __func__); |
| 544 | |
| 545 | /* TODO: lazily sync: currently VMD doesn't close things */ |
| 546 | buf = htobe64(disk->l1[l1off])(__uint64_t)(__builtin_constant_p(disk->l1[l1off]) ? (__uint64_t )((((__uint64_t)(disk->l1[l1off]) & 0xff) << 56) | ((__uint64_t)(disk->l1[l1off]) & 0xff00ULL) << 40 | ((__uint64_t)(disk->l1[l1off]) & 0xff0000ULL) << 24 | ((__uint64_t)(disk->l1[l1off]) & 0xff000000ULL) << 8 | ((__uint64_t)(disk->l1[l1off]) & 0xff00000000ULL) >> 8 | ((__uint64_t)(disk->l1[l1off]) & 0xff0000000000ULL ) >> 24 | ((__uint64_t)(disk->l1[l1off]) & 0xff000000000000ULL ) >> 40 | ((__uint64_t)(disk->l1[l1off]) & 0xff00000000000000ULL ) >> 56) : __swap64md(disk->l1[l1off])); |
| 547 | if (pwrite(disk->fd, &buf, sizeof(buf), disk->l1off + 8 * l1off) != 8) |
| 548 | fatalx("%s: could not write l1", __func__); |
| 549 | inc_refs(disk, cluster, 1); |
| 550 | |
| 551 | pthread_rwlock_unlock(&disk->lock); |
| 552 | clusteroff = off % disk->clustersz; |
| 553 | if (cluster + clusteroff < disk->clustersz) |
| 554 | fatalx("write would clobber header"); |
| 555 | return cluster + clusteroff; |
| 556 | } |
| 557 | |
| 558 | /* Copies a cluster containing src to dst. Src and dst need not be aligned. */ |
| 559 | static void |
| 560 | copy_cluster(struct qcdisk *disk, struct qcdisk *base, off_t dst, off_t src) |
| 561 | { |
| 562 | char *scratch; |
| 563 | |
| 564 | scratch = malloc(disk->clustersz); |
| 565 | if (!scratch) |
| 566 | fatal("out of memory"); |
| 567 | src &= ~(disk->clustersz - 1); |
| 568 | dst &= ~(disk->clustersz - 1); |
| 569 | if (pread(base->fd, scratch, disk->clustersz, src) == -1) |
| 570 | fatal("%s: could not read cluster", __func__); |
| 571 | if (pwrite(disk->fd, scratch, disk->clustersz, dst) == -1) |
| 572 | fatal("%s: could not write cluster", __func__); |
| 573 | free(scratch); |
| 574 | } |
| 575 | |
| 576 | static void |
| 577 | inc_refs(struct qcdisk *disk, off_t off, int newcluster) |
| 578 | { |
| 579 | off_t l1off, l1idx, l2idx, l2cluster; |
| 580 | size_t nper; |
| 581 | uint16_t refs; |
| 582 | uint64_t buf; |
| 583 | |
| 584 | off &= ~QCOW2_INPLACE0x8000000000000000ull; |
| 585 | nper = disk->clustersz / 2; |
| 586 | l1idx = (off / disk->clustersz) / nper; |
| 587 | l2idx = (off / disk->clustersz) % nper; |
| 588 | l1off = disk->refoff + 8 * l1idx; |
| 589 | if (pread(disk->fd, &buf, sizeof(buf), l1off) != 8) |
| 590 | fatal("could not read refs"); |
| 591 | |
| 592 | l2cluster = be64toh(buf)(__uint64_t)(__builtin_constant_p(buf) ? (__uint64_t)((((__uint64_t )(buf) & 0xff) << 56) | ((__uint64_t)(buf) & 0xff00ULL ) << 40 | ((__uint64_t)(buf) & 0xff0000ULL) << 24 | ((__uint64_t)(buf) & 0xff000000ULL) << 8 | (( __uint64_t)(buf) & 0xff00000000ULL) >> 8 | ((__uint64_t )(buf) & 0xff0000000000ULL) >> 24 | ((__uint64_t)(buf ) & 0xff000000000000ULL) >> 40 | ((__uint64_t)(buf) & 0xff00000000000000ULL) >> 56) : __swap64md(buf)); |
| 593 | if (l2cluster == 0) { |
| 594 | l2cluster = disk->end; |
| 595 | disk->end += disk->clustersz; |
| 596 | if (ftruncate(disk->fd, disk->end) < 0) |
| 597 | fatal("%s: failed to allocate ref block", __func__); |
| 598 | buf = htobe64(l2cluster)(__uint64_t)(__builtin_constant_p(l2cluster) ? (__uint64_t)(( ((__uint64_t)(l2cluster) & 0xff) << 56) | ((__uint64_t )(l2cluster) & 0xff00ULL) << 40 | ((__uint64_t)(l2cluster ) & 0xff0000ULL) << 24 | ((__uint64_t)(l2cluster) & 0xff000000ULL) << 8 | ((__uint64_t)(l2cluster) & 0xff00000000ULL ) >> 8 | ((__uint64_t)(l2cluster) & 0xff0000000000ULL ) >> 24 | ((__uint64_t)(l2cluster) & 0xff000000000000ULL ) >> 40 | ((__uint64_t)(l2cluster) & 0xff00000000000000ULL ) >> 56) : __swap64md(l2cluster)); |
| 599 | if (pwrite(disk->fd, &buf, sizeof(buf), l1off) != 8) |
| 600 | fatal("%s: failed to write ref block", __func__); |
| 601 | } |
| 602 | |
| 603 | refs = 1; |
| 604 | if (!newcluster) { |
| 605 | if (pread(disk->fd, &refs, sizeof(refs), |
| 606 | l2cluster + 2 * l2idx) != 2) |
| 607 | fatal("could not read ref cluster"); |
| 608 | refs = be16toh(refs)(__uint16_t)(__builtin_constant_p(refs) ? (__uint16_t)(((__uint16_t )(refs) & 0xffU) << 8 | ((__uint16_t)(refs) & 0xff00U ) >> 8) : __swap16md(refs)) + 1; |
| 609 | } |
| 610 | refs = htobe16(refs)(__uint16_t)(__builtin_constant_p(refs) ? (__uint16_t)(((__uint16_t )(refs) & 0xffU) << 8 | ((__uint16_t)(refs) & 0xff00U ) >> 8) : __swap16md(refs)); |
| 611 | if (pwrite(disk->fd, &refs, sizeof(refs), l2cluster + 2 * l2idx) != 2) |
| 612 | fatal("%s: could not write ref block", __func__); |
| 613 | } |
| 614 | |
| 615 | /* |
| 616 | * virtio_qcow2_create |
| 617 | * |
| 618 | * Create an empty qcow2 imagefile with the specified path and size. |
| 619 | * |
| 620 | * Parameters: |
| 621 | * imgfile_path: path to the image file to create |
| 622 | * imgsize : size of the image file to create (in MB) |
| 623 | * |
| 624 | * Return: |
| 625 | * EEXIST: The requested image file already exists |
| 626 | * 0 : Image file successfully created |
| 627 | * Exxxx : Various other Exxxx errno codes due to other I/O errors |
| 628 | */ |
| 629 | int |
| 630 | virtio_qcow2_create(const char *imgfile_path, |
| 631 | const char *base_path, long imgsize) |
| 632 | { |
| 633 | struct qcheader hdr, basehdr; |
| 634 | int fd, ret; |
| 635 | ssize_t base_len; |
| 636 | uint64_t l1sz, refsz, disksz, initsz, clustersz; |
| 637 | uint64_t l1off, refoff, v, i, l1entrysz, refentrysz; |
| 638 | uint16_t refs; |
| 639 | |
| 640 | disksz = 1024 * 1024 * imgsize; |
| 641 | |
| 642 | if (base_path) { |
| 643 | fd = open(base_path, O_RDONLY0x0000); |
| 644 | if (read(fd, &basehdr, sizeof(basehdr)) != sizeof(basehdr)) |
| 645 | err(1, "failure to read base image header"); |
| 646 | close(fd); |
| 647 | if (strncmp(basehdr.magic, |
| 648 | VM_MAGIC_QCOW"QFI\xfb", strlen(VM_MAGIC_QCOW"QFI\xfb")) != 0) |
| 649 | errx(1, "base image is not a qcow2 file"); |
| 650 | if (!disksz) |
| 651 | disksz = betoh64(basehdr.disksz)(__uint64_t)(__builtin_constant_p(basehdr.disksz) ? (__uint64_t )((((__uint64_t)(basehdr.disksz) & 0xff) << 56) | ( (__uint64_t)(basehdr.disksz) & 0xff00ULL) << 40 | ( (__uint64_t)(basehdr.disksz) & 0xff0000ULL) << 24 | ((__uint64_t)(basehdr.disksz) & 0xff000000ULL) << 8 | ((__uint64_t)(basehdr.disksz) & 0xff00000000ULL) >> 8 | ((__uint64_t)(basehdr.disksz) & 0xff0000000000ULL) >> 24 | ((__uint64_t)(basehdr.disksz) & 0xff000000000000ULL ) >> 40 | ((__uint64_t)(basehdr.disksz) & 0xff00000000000000ULL ) >> 56) : __swap64md(basehdr.disksz)); |
| 652 | else if (disksz != betoh64(basehdr.disksz)(__uint64_t)(__builtin_constant_p(basehdr.disksz) ? (__uint64_t )((((__uint64_t)(basehdr.disksz) & 0xff) << 56) | ( (__uint64_t)(basehdr.disksz) & 0xff00ULL) << 40 | ( (__uint64_t)(basehdr.disksz) & 0xff0000ULL) << 24 | ((__uint64_t)(basehdr.disksz) & 0xff000000ULL) << 8 | ((__uint64_t)(basehdr.disksz) & 0xff00000000ULL) >> 8 | ((__uint64_t)(basehdr.disksz) & 0xff0000000000ULL) >> 24 | ((__uint64_t)(basehdr.disksz) & 0xff000000000000ULL ) >> 40 | ((__uint64_t)(basehdr.disksz) & 0xff00000000000000ULL ) >> 56) : __swap64md(basehdr.disksz))) |
| 653 | errx(1, "base size does not match requested size"); |
| 654 | } |
| 655 | if (!base_path && !disksz) |
| 656 | errx(1, "missing disk size"); |
| 657 | |
| 658 | clustersz = (1<<16); |
| 659 | l1off = ALIGNSZ(sizeof(hdr), clustersz)((sizeof(hdr) + clustersz - 1) & ~(clustersz - 1)); |
| 660 | |
| 661 | l1entrysz = clustersz * clustersz / 8; |
| 662 | l1sz = (disksz + l1entrysz - 1) / l1entrysz; |
| 663 | |
| 664 | refoff = ALIGNSZ(l1off + 8*l1sz, clustersz)((l1off + 8*l1sz + clustersz - 1) & ~(clustersz - 1)); |
| 665 | refentrysz = clustersz * clustersz * clustersz / 2; |
| 666 | refsz = (disksz + refentrysz - 1) / refentrysz; |
| 667 | |
| 668 | initsz = ALIGNSZ(refoff + refsz*clustersz, clustersz)((refoff + refsz*clustersz + clustersz - 1) & ~(clustersz - 1)); |
| 669 | base_len = base_path ? strlen(base_path) : 0; |
| 670 | |
| 671 | memcpy(hdr.magic, VM_MAGIC_QCOW"QFI\xfb", strlen(VM_MAGIC_QCOW"QFI\xfb")); |
| 672 | hdr.version = htobe32(3)(__uint32_t)(__builtin_constant_p(3) ? (__uint32_t)(((__uint32_t )(3) & 0xff) << 24 | ((__uint32_t)(3) & 0xff00) << 8 | ((__uint32_t)(3) & 0xff0000) >> 8 | ( (__uint32_t)(3) & 0xff000000) >> 24) : __swap32md(3 )); |
| 673 | hdr.backingoff = htobe64(base_path ? sizeof(hdr) : 0)(__uint64_t)(__builtin_constant_p(base_path ? sizeof(hdr) : 0 ) ? (__uint64_t)((((__uint64_t)(base_path ? sizeof(hdr) : 0) & 0xff) << 56) | ((__uint64_t)(base_path ? sizeof(hdr) : 0) & 0xff00ULL) << 40 | ((__uint64_t)(base_path ? sizeof (hdr) : 0) & 0xff0000ULL) << 24 | ((__uint64_t)(base_path ? sizeof(hdr) : 0) & 0xff000000ULL) << 8 | ((__uint64_t )(base_path ? sizeof(hdr) : 0) & 0xff00000000ULL) >> 8 | ((__uint64_t)(base_path ? sizeof(hdr) : 0) & 0xff0000000000ULL ) >> 24 | ((__uint64_t)(base_path ? sizeof(hdr) : 0) & 0xff000000000000ULL) >> 40 | ((__uint64_t)(base_path ? sizeof(hdr) : 0) & 0xff00000000000000ULL) >> 56) : __swap64md(base_path ? sizeof(hdr) : 0)); |
| 674 | hdr.backingsz = htobe32(base_len)(__uint32_t)(__builtin_constant_p(base_len) ? (__uint32_t)((( __uint32_t)(base_len) & 0xff) << 24 | ((__uint32_t) (base_len) & 0xff00) << 8 | ((__uint32_t)(base_len) & 0xff0000) >> 8 | ((__uint32_t)(base_len) & 0xff000000 ) >> 24) : __swap32md(base_len)); |
| 675 | hdr.clustershift = htobe32(16)(__uint32_t)(__builtin_constant_p(16) ? (__uint32_t)(((__uint32_t )(16) & 0xff) << 24 | ((__uint32_t)(16) & 0xff00 ) << 8 | ((__uint32_t)(16) & 0xff0000) >> 8 | ((__uint32_t)(16) & 0xff000000) >> 24) : __swap32md (16)); |
| 676 | hdr.disksz = htobe64(disksz)(__uint64_t)(__builtin_constant_p(disksz) ? (__uint64_t)((((__uint64_t )(disksz) & 0xff) << 56) | ((__uint64_t)(disksz) & 0xff00ULL) << 40 | ((__uint64_t)(disksz) & 0xff0000ULL ) << 24 | ((__uint64_t)(disksz) & 0xff000000ULL) << 8 | ((__uint64_t)(disksz) & 0xff00000000ULL) >> 8 | ((__uint64_t)(disksz) & 0xff0000000000ULL) >> 24 | ((__uint64_t)(disksz) & 0xff000000000000ULL) >> 40 | ((__uint64_t)(disksz) & 0xff00000000000000ULL) >> 56) : __swap64md(disksz)); |
| 677 | hdr.cryptmethod = htobe32(0)(__uint32_t)(__builtin_constant_p(0) ? (__uint32_t)(((__uint32_t )(0) & 0xff) << 24 | ((__uint32_t)(0) & 0xff00) << 8 | ((__uint32_t)(0) & 0xff0000) >> 8 | ( (__uint32_t)(0) & 0xff000000) >> 24) : __swap32md(0 )); |
| 678 | hdr.l1sz = htobe32(l1sz)(__uint32_t)(__builtin_constant_p(l1sz) ? (__uint32_t)(((__uint32_t )(l1sz) & 0xff) << 24 | ((__uint32_t)(l1sz) & 0xff00 ) << 8 | ((__uint32_t)(l1sz) & 0xff0000) >> 8 | ((__uint32_t)(l1sz) & 0xff000000) >> 24) : __swap32md (l1sz)); |
| 679 | hdr.l1off = htobe64(l1off)(__uint64_t)(__builtin_constant_p(l1off) ? (__uint64_t)((((__uint64_t )(l1off) & 0xff) << 56) | ((__uint64_t)(l1off) & 0xff00ULL) << 40 | ((__uint64_t)(l1off) & 0xff0000ULL ) << 24 | ((__uint64_t)(l1off) & 0xff000000ULL) << 8 | ((__uint64_t)(l1off) & 0xff00000000ULL) >> 8 | ((__uint64_t)(l1off) & 0xff0000000000ULL) >> 24 | ( (__uint64_t)(l1off) & 0xff000000000000ULL) >> 40 | ( (__uint64_t)(l1off) & 0xff00000000000000ULL) >> 56) : __swap64md(l1off)); |
| 680 | hdr.refoff = htobe64(refoff)(__uint64_t)(__builtin_constant_p(refoff) ? (__uint64_t)((((__uint64_t )(refoff) & 0xff) << 56) | ((__uint64_t)(refoff) & 0xff00ULL) << 40 | ((__uint64_t)(refoff) & 0xff0000ULL ) << 24 | ((__uint64_t)(refoff) & 0xff000000ULL) << 8 | ((__uint64_t)(refoff) & 0xff00000000ULL) >> 8 | ((__uint64_t)(refoff) & 0xff0000000000ULL) >> 24 | ((__uint64_t)(refoff) & 0xff000000000000ULL) >> 40 | ((__uint64_t)(refoff) & 0xff00000000000000ULL) >> 56) : __swap64md(refoff)); |
| 681 | hdr.refsz = htobe32(refsz)(__uint32_t)(__builtin_constant_p(refsz) ? (__uint32_t)(((__uint32_t )(refsz) & 0xff) << 24 | ((__uint32_t)(refsz) & 0xff00) << 8 | ((__uint32_t)(refsz) & 0xff0000) >> 8 | ((__uint32_t)(refsz) & 0xff000000) >> 24) : __swap32md (refsz)); |
| 682 | hdr.snapcount = htobe32(0)(__uint32_t)(__builtin_constant_p(0) ? (__uint32_t)(((__uint32_t )(0) & 0xff) << 24 | ((__uint32_t)(0) & 0xff00) << 8 | ((__uint32_t)(0) & 0xff0000) >> 8 | ( (__uint32_t)(0) & 0xff000000) >> 24) : __swap32md(0 )); |
| 683 | hdr.snapsz = htobe64(0)(__uint64_t)(__builtin_constant_p(0) ? (__uint64_t)((((__uint64_t )(0) & 0xff) << 56) | ((__uint64_t)(0) & 0xff00ULL ) << 40 | ((__uint64_t)(0) & 0xff0000ULL) << 24 | ((__uint64_t)(0) & 0xff000000ULL) << 8 | ((__uint64_t )(0) & 0xff00000000ULL) >> 8 | ((__uint64_t)(0) & 0xff0000000000ULL) >> 24 | ((__uint64_t)(0) & 0xff000000000000ULL ) >> 40 | ((__uint64_t)(0) & 0xff00000000000000ULL) >> 56) : __swap64md(0)); |
| 684 | hdr.incompatfeatures = htobe64(0)(__uint64_t)(__builtin_constant_p(0) ? (__uint64_t)((((__uint64_t )(0) & 0xff) << 56) | ((__uint64_t)(0) & 0xff00ULL ) << 40 | ((__uint64_t)(0) & 0xff0000ULL) << 24 | ((__uint64_t)(0) & 0xff000000ULL) << 8 | ((__uint64_t )(0) & 0xff00000000ULL) >> 8 | ((__uint64_t)(0) & 0xff0000000000ULL) >> 24 | ((__uint64_t)(0) & 0xff000000000000ULL ) >> 40 | ((__uint64_t)(0) & 0xff00000000000000ULL) >> 56) : __swap64md(0)); |
| 685 | hdr.compatfeatures = htobe64(0)(__uint64_t)(__builtin_constant_p(0) ? (__uint64_t)((((__uint64_t )(0) & 0xff) << 56) | ((__uint64_t)(0) & 0xff00ULL ) << 40 | ((__uint64_t)(0) & 0xff0000ULL) << 24 | ((__uint64_t)(0) & 0xff000000ULL) << 8 | ((__uint64_t )(0) & 0xff00000000ULL) >> 8 | ((__uint64_t)(0) & 0xff0000000000ULL) >> 24 | ((__uint64_t)(0) & 0xff000000000000ULL ) >> 40 | ((__uint64_t)(0) & 0xff00000000000000ULL) >> 56) : __swap64md(0)); |
| 686 | hdr.autoclearfeatures = htobe64(0)(__uint64_t)(__builtin_constant_p(0) ? (__uint64_t)((((__uint64_t )(0) & 0xff) << 56) | ((__uint64_t)(0) & 0xff00ULL ) << 40 | ((__uint64_t)(0) & 0xff0000ULL) << 24 | ((__uint64_t)(0) & 0xff000000ULL) << 8 | ((__uint64_t )(0) & 0xff00000000ULL) >> 8 | ((__uint64_t)(0) & 0xff0000000000ULL) >> 24 | ((__uint64_t)(0) & 0xff000000000000ULL ) >> 40 | ((__uint64_t)(0) & 0xff00000000000000ULL) >> 56) : __swap64md(0)); |
| 687 | hdr.reforder = htobe32(4)(__uint32_t)(__builtin_constant_p(4) ? (__uint32_t)(((__uint32_t )(4) & 0xff) << 24 | ((__uint32_t)(4) & 0xff00) << 8 | ((__uint32_t)(4) & 0xff0000) >> 8 | ( (__uint32_t)(4) & 0xff000000) >> 24) : __swap32md(4 )); |
| 688 | hdr.headersz = htobe32(sizeof(hdr))(__uint32_t)(__builtin_constant_p(sizeof(hdr)) ? (__uint32_t) (((__uint32_t)(sizeof(hdr)) & 0xff) << 24 | ((__uint32_t )(sizeof(hdr)) & 0xff00) << 8 | ((__uint32_t)(sizeof (hdr)) & 0xff0000) >> 8 | ((__uint32_t)(sizeof(hdr) ) & 0xff000000) >> 24) : __swap32md(sizeof(hdr))); |
| 689 | |
| 690 | /* Refuse to overwrite an existing image */ |
| 691 | fd = open(imgfile_path, O_RDWR0x0002 | O_CREAT0x0200 | O_TRUNC0x0400 | O_EXCL0x0800, |
| 692 | S_IRUSR0000400 | S_IWUSR0000200); |
| 693 | if (fd == -1) |
| 694 | return (errno(*__errno())); |
| 695 | |
| 696 | /* Write out the header */ |
| 697 | if (write(fd, &hdr, sizeof(hdr)) != sizeof(hdr)) |
| 698 | goto error; |
| 699 | |
| 700 | /* Add the base image */ |
| 701 | if (base_path && write(fd, base_path, base_len) != base_len) |
| 702 | goto error; |
| 703 | |
| 704 | /* Extend to desired size, and add one refcount cluster */ |
| 705 | if (ftruncate(fd, (off_t)initsz + clustersz) == -1) |
| 706 | goto error; |
| 707 | |
| 708 | /* |
| 709 | * Paranoia: if our disk image takes more than one cluster |
| 710 | * to refcount the initial image, fail. |
| 711 | */ |
| 712 | if (initsz/clustersz > clustersz/2) { |
| 713 | errno(*__errno()) = ERANGE34; |
| 714 | goto error; |
| 715 | } |
| 716 | |
| 717 | /* Add a refcount block, and refcount ourselves. */ |
| 718 | v = htobe64(initsz)(__uint64_t)(__builtin_constant_p(initsz) ? (__uint64_t)((((__uint64_t )(initsz) & 0xff) << 56) | ((__uint64_t)(initsz) & 0xff00ULL) << 40 | ((__uint64_t)(initsz) & 0xff0000ULL ) << 24 | ((__uint64_t)(initsz) & 0xff000000ULL) << 8 | ((__uint64_t)(initsz) & 0xff00000000ULL) >> 8 | ((__uint64_t)(initsz) & 0xff0000000000ULL) >> 24 | ((__uint64_t)(initsz) & 0xff000000000000ULL) >> 40 | ((__uint64_t)(initsz) & 0xff00000000000000ULL) >> 56) : __swap64md(initsz)); |
| 719 | if (pwrite(fd, &v, 8, refoff) != 8) |
| 720 | goto error; |
| 721 | for (i = 0; i < initsz/clustersz + 1; i++) { |
| 722 | refs = htobe16(1)(__uint16_t)(__builtin_constant_p(1) ? (__uint16_t)(((__uint16_t )(1) & 0xffU) << 8 | ((__uint16_t)(1) & 0xff00U ) >> 8) : __swap16md(1)); |
| 723 | if (pwrite(fd, &refs, 2, initsz + 2*i) != 2) |
| 724 | goto error; |
| 725 | } |
| 726 | |
| 727 | ret = close(fd); |
| 728 | return (ret); |
| 729 | error: |
| 730 | ret = errno(*__errno()); |
| 731 | close(fd); |
| 732 | unlink(imgfile_path); |
| 733 | return (errno(*__errno())); |
| 734 | } |