2 * Copyright (c) 2007 Doug Rabson
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
33 * Stand-alone file reading package.
36 #include <sys/param.h>
37 #include <sys/disklabel.h>
39 #include <sys/queue.h>
44 #include <bootstrap.h>
50 static int zfs_open(const char *path, struct open_file *f);
51 static int zfs_write(struct open_file *f, void *buf, size_t size, size_t *resid);
52 static int zfs_close(struct open_file *f);
53 static int zfs_read(struct open_file *f, void *buf, size_t size, size_t *resid);
54 static off_t zfs_seek(struct open_file *f, off_t offset, int where);
55 static int zfs_stat(struct open_file *f, struct stat *sb);
56 static int zfs_readdir(struct open_file *f, struct dirent *d);
59 struct devsw zfs_dev_compat;
61 struct fs_ops zfs_fsops = {
76 off_t f_seekp; /* seek pointer */
78 uint64_t f_zap_type; /* zap type for readdir */
79 uint64_t f_num_leafs; /* number of fzap leaf blocks */
80 zap_leaf_phys_t *f_zap_leaf; /* zap leaf buffer */
87 zfs_open(const char *upath, struct open_file *f)
89 struct zfsmount *mount = (struct zfsmount *)f->f_devdata;
93 if (f->f_dev != &zfs_dev && f->f_dev != &zfs_dev_compat)
96 /* allocate file system specific data structure */
97 fp = malloc(sizeof(struct file));
98 bzero(fp, sizeof(struct file));
99 f->f_fsdata = (void *)fp;
101 rc = zfs_lookup(mount, upath, &fp->f_dnode);
111 zfs_close(struct open_file *f)
113 struct file *fp = (struct file *)f->f_fsdata;
116 f->f_fsdata = (void *)0;
117 if (fp == (struct file *)0)
125 * Copy a portion of a file into kernel memory.
126 * Cross block boundaries when necessary.
129 zfs_read(struct open_file *f, void *start, size_t size, size_t *resid /* out */)
131 spa_t *spa = ((struct zfsmount *)f->f_devdata)->spa;
132 struct file *fp = (struct file *)f->f_fsdata;
137 rc = zfs_stat(f, &sb);
141 if (fp->f_seekp + n > sb.st_size)
142 n = sb.st_size - fp->f_seekp;
144 rc = dnode_read(spa, &fp->f_dnode, fp->f_seekp, start, n);
150 for (i = 0; i < n; i++)
151 putchar(((char*) start)[i]);
161 * Don't be silly - the bootstrap has no business writing anything.
164 zfs_write(struct open_file *f, void *start, size_t size, size_t *resid /* out */)
171 zfs_seek(struct open_file *f, off_t offset, int where)
173 struct file *fp = (struct file *)f->f_fsdata;
177 fp->f_seekp = offset;
180 fp->f_seekp += offset;
187 error = zfs_stat(f, &sb);
192 fp->f_seekp = sb.st_size - offset;
199 return (fp->f_seekp);
203 zfs_stat(struct open_file *f, struct stat *sb)
205 spa_t *spa = ((struct zfsmount *)f->f_devdata)->spa;
206 struct file *fp = (struct file *)f->f_fsdata;
208 return (zfs_dnode_stat(spa, &fp->f_dnode, sb));
212 zfs_readdir(struct open_file *f, struct dirent *d)
214 spa_t *spa = ((struct zfsmount *)f->f_devdata)->spa;
215 struct file *fp = (struct file *)f->f_fsdata;
218 size_t bsize = fp->f_dnode.dn_datablkszsec << SPA_MINBLOCKSHIFT;
221 rc = zfs_stat(f, &sb);
224 if (!S_ISDIR(sb.st_mode))
228 * If this is the first read, get the zap type.
230 if (fp->f_seekp == 0) {
231 rc = dnode_read(spa, &fp->f_dnode,
232 0, &fp->f_zap_type, sizeof(fp->f_zap_type));
236 if (fp->f_zap_type == ZBT_MICRO) {
237 fp->f_seekp = offsetof(mzap_phys_t, mz_chunk);
239 rc = dnode_read(spa, &fp->f_dnode,
240 offsetof(zap_phys_t, zap_num_leafs),
242 sizeof(fp->f_num_leafs));
247 fp->f_zap_leaf = (zap_leaf_phys_t *)malloc(bsize);
248 rc = dnode_read(spa, &fp->f_dnode,
257 if (fp->f_zap_type == ZBT_MICRO) {
259 if (fp->f_seekp >= bsize)
262 rc = dnode_read(spa, &fp->f_dnode,
263 fp->f_seekp, &mze, sizeof(mze));
266 fp->f_seekp += sizeof(mze);
268 if (!mze.mze_name[0])
271 d->d_fileno = ZFS_DIRENT_OBJ(mze.mze_value);
272 d->d_type = ZFS_DIRENT_TYPE(mze.mze_value);
273 strcpy(d->d_name, mze.mze_name);
274 d->d_namlen = strlen(d->d_name);
278 zap_leaf_chunk_t *zc, *nc;
285 * Initialise this so we can use the ZAP size
286 * calculating macros.
288 zl.l_bs = ilog2(bsize);
289 zl.l_phys = fp->f_zap_leaf;
292 * Figure out which chunk we are currently looking at
293 * and consider seeking to the next leaf. We use the
294 * low bits of f_seekp as a simple chunk index.
297 chunk = fp->f_seekp & (bsize - 1);
298 if (chunk == ZAP_LEAF_NUMCHUNKS(&zl)) {
299 fp->f_seekp = (fp->f_seekp & ~(bsize - 1)) + bsize;
303 * Check for EOF and read the new leaf.
305 if (fp->f_seekp >= bsize * fp->f_num_leafs)
308 rc = dnode_read(spa, &fp->f_dnode,
316 zc = &ZAP_LEAF_CHUNK(&zl, chunk);
318 if (zc->l_entry.le_type != ZAP_CHUNK_ENTRY)
321 namelen = zc->l_entry.le_name_length;
322 if (namelen > sizeof(d->d_name))
323 namelen = sizeof(d->d_name);
326 * Paste the name back together.
328 nc = &ZAP_LEAF_CHUNK(&zl, zc->l_entry.le_name_chunk);
330 while (namelen > 0) {
333 if (len > ZAP_LEAF_ARRAY_BYTES)
334 len = ZAP_LEAF_ARRAY_BYTES;
335 memcpy(p, nc->l_array.la_array, len);
338 nc = &ZAP_LEAF_CHUNK(&zl, nc->l_array.la_next);
340 d->d_name[sizeof(d->d_name) - 1] = 0;
343 * Assume the first eight bytes of the value are
346 value = fzap_leaf_value(&zl, zc);
348 d->d_fileno = ZFS_DIRENT_OBJ(value);
349 d->d_type = ZFS_DIRENT_TYPE(value);
350 d->d_namlen = strlen(d->d_name);
357 vdev_read(vdev_t *vdev, void *priv, off_t offset, void *buf, size_t size)
361 fd = (uintptr_t) priv;
362 lseek(fd, offset, SEEK_SET);
363 if (read(fd, buf, size) == size) {
374 if (archsw.arch_zfs_probe == NULL)
376 archsw.arch_zfs_probe();
381 zfs_probe_dev(const char *devname, uint64_t *pool_guid)
387 fd = open(devname, O_RDONLY);
390 ret = vdev_probe(vdev_read, (void *)(uintptr_t)fd, &spa);
393 else if (pool_guid != NULL)
394 *pool_guid = spa->spa_guid;
399 * Print information about ZFS pools
402 zfs_dev_print(int verbose)
411 STAILQ_FOREACH(spa, &zfs_pools, spa_link) {
412 sprintf(line, " zfs:%s\n", spa->spa_name);
418 * Attempt to open the pool described by (dev) for use by (f).
421 zfs_dev_open(struct open_file *f, ...)
424 struct zfs_devdesc *dev;
425 struct zfsmount *mount;
430 dev = va_arg(args, struct zfs_devdesc *);
433 spa = spa_find_by_guid(dev->pool_guid);
436 rv = zfs_spa_init(spa);
439 mount = malloc(sizeof(*mount));
440 rv = zfs_mount(spa, dev->root_guid, mount);
445 if (mount->objset.os_type != DMU_OST_ZFS) {
446 printf("Unexpected object set type %ju\n",
447 (uintmax_t)mount->objset.os_type);
451 f->f_devdata = mount;
457 zfs_dev_close(struct open_file *f)
466 zfs_dev_strategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, size_t *rsize)
472 struct devsw zfs_dev = {
475 .dv_init = zfs_dev_init,
476 .dv_strategy = zfs_dev_strategy,
477 .dv_open = zfs_dev_open,
478 .dv_close = zfs_dev_close,
480 .dv_print = zfs_dev_print,
485 zfs_parsedev(struct zfs_devdesc *dev, const char *devspec, const char **path)
487 static char rootname[ZFS_MAXNAMELEN];
488 static char poolname[ZFS_MAXNAMELEN];
499 end = strchr(np, ':');
502 sep = strchr(np, '/');
503 if (sep == NULL || sep >= end)
505 memcpy(poolname, np, sep - np);
506 poolname[sep - np] = '\0';
509 memcpy(rootname, sep, end - sep);
510 rootname[end - sep] = '\0';
515 spa = spa_find_by_name(poolname);
518 rv = zfs_spa_init(spa);
521 dev->pool_guid = spa->spa_guid;
522 if (rootname[0] != '\0') {
523 rv = zfs_lookup_dataset(spa, rootname, &dev->root_guid);
529 *path = (*end == '\0') ? end : end + 1;
530 dev->d_dev = &zfs_dev;
531 dev->d_type = zfs_dev.dv_type;
536 zfs_fmtdev(void *vdev)
538 static char rootname[ZFS_MAXNAMELEN];
539 static char buf[2 * ZFS_MAXNAMELEN + 8];
540 struct zfs_devdesc *dev = (struct zfs_devdesc *)vdev;
544 if (dev->d_type != DEVT_ZFS)
547 spa = spa_find_by_guid(dev->pool_guid);
549 printf("ZFS: can't find pool by guid\n");
552 if (zfs_spa_init(spa) != 0) {
553 printf("ZFS: can't init pool\n");
556 if (dev->root_guid == 0 && zfs_get_root(spa, &dev->root_guid)) {
557 printf("ZFS: can't find root filesystem\n");
560 if (zfs_rlookup(spa, dev->root_guid, rootname)) {
561 printf("ZFS: can't find filesystem by guid\n");
565 if (rootname[0] == '\0')
566 sprintf(buf, "%s:%s:", dev->d_dev->dv_name, spa->spa_name);
568 sprintf(buf, "%s:%s/%s:", dev->d_dev->dv_name, spa->spa_name,