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);
60 struct fs_ops zfs_fsops = {
75 off_t f_seekp; /* seek pointer */
77 uint64_t f_zap_type; /* zap type for readdir */
78 uint64_t f_num_leafs; /* number of fzap leaf blocks */
79 zap_leaf_phys_t *f_zap_leaf; /* zap leaf buffer */
86 zfs_open(const char *upath, struct open_file *f)
88 spa_t *spa = (spa_t *) f->f_devdata;
92 if (f->f_dev != &zfs_dev)
95 rc = zfs_mount_pool(spa);
99 /* allocate file system specific data structure */
100 fp = malloc(sizeof(struct file));
101 bzero(fp, sizeof(struct file));
102 f->f_fsdata = (void *)fp;
104 if (spa->spa_root_objset.os_type != DMU_OST_ZFS) {
105 printf("Unexpected object set type %llu\n",
106 spa->spa_root_objset.os_type);
111 rc = zfs_lookup(spa, upath, &fp->f_dnode);
125 zfs_close(struct open_file *f)
127 struct file *fp = (struct file *)f->f_fsdata;
130 f->f_fsdata = (void *)0;
131 if (fp == (struct file *)0)
139 * Copy a portion of a file into kernel memory.
140 * Cross block boundaries when necessary.
143 zfs_read(struct open_file *f, void *start, size_t size, size_t *resid /* out */)
145 spa_t *spa = (spa_t *) f->f_devdata;
146 struct file *fp = (struct file *)f->f_fsdata;
151 rc = zfs_stat(f, &sb);
155 if (fp->f_seekp + n > sb.st_size)
156 n = sb.st_size - fp->f_seekp;
158 rc = dnode_read(spa, &fp->f_dnode, fp->f_seekp, start, n);
164 for (i = 0; i < n; i++)
165 putchar(((char*) start)[i]);
175 * Don't be silly - the bootstrap has no business writing anything.
178 zfs_write(struct open_file *f, void *start, size_t size, size_t *resid /* out */)
185 zfs_seek(struct open_file *f, off_t offset, int where)
187 struct file *fp = (struct file *)f->f_fsdata;
191 fp->f_seekp = offset;
194 fp->f_seekp += offset;
201 error = zfs_stat(f, &sb);
206 fp->f_seekp = sb.st_size - offset;
213 return (fp->f_seekp);
217 zfs_stat(struct open_file *f, struct stat *sb)
219 spa_t *spa = (spa_t *) f->f_devdata;
220 struct file *fp = (struct file *)f->f_fsdata;
222 return (zfs_dnode_stat(spa, &fp->f_dnode, sb));
226 zfs_readdir(struct open_file *f, struct dirent *d)
228 spa_t *spa = (spa_t *) f->f_devdata;
229 struct file *fp = (struct file *)f->f_fsdata;
232 size_t bsize = fp->f_dnode.dn_datablkszsec << SPA_MINBLOCKSHIFT;
235 rc = zfs_stat(f, &sb);
238 if (!S_ISDIR(sb.st_mode))
242 * If this is the first read, get the zap type.
244 if (fp->f_seekp == 0) {
245 rc = dnode_read(spa, &fp->f_dnode,
246 0, &fp->f_zap_type, sizeof(fp->f_zap_type));
250 if (fp->f_zap_type == ZBT_MICRO) {
251 fp->f_seekp = offsetof(mzap_phys_t, mz_chunk);
253 rc = dnode_read(spa, &fp->f_dnode,
254 offsetof(zap_phys_t, zap_num_leafs),
256 sizeof(fp->f_num_leafs));
261 fp->f_zap_leaf = (zap_leaf_phys_t *)malloc(bsize);
262 rc = dnode_read(spa, &fp->f_dnode,
271 if (fp->f_zap_type == ZBT_MICRO) {
273 if (fp->f_seekp >= bsize)
276 rc = dnode_read(spa, &fp->f_dnode,
277 fp->f_seekp, &mze, sizeof(mze));
280 fp->f_seekp += sizeof(mze);
282 if (!mze.mze_name[0])
285 d->d_fileno = ZFS_DIRENT_OBJ(mze.mze_value);
286 d->d_type = ZFS_DIRENT_TYPE(mze.mze_value);
287 strcpy(d->d_name, mze.mze_name);
288 d->d_namlen = strlen(d->d_name);
292 zap_leaf_chunk_t *zc, *nc;
299 * Initialise this so we can use the ZAP size
300 * calculating macros.
302 zl.l_bs = ilog2(bsize);
303 zl.l_phys = fp->f_zap_leaf;
306 * Figure out which chunk we are currently looking at
307 * and consider seeking to the next leaf. We use the
308 * low bits of f_seekp as a simple chunk index.
311 chunk = fp->f_seekp & (bsize - 1);
312 if (chunk == ZAP_LEAF_NUMCHUNKS(&zl)) {
313 fp->f_seekp = (fp->f_seekp & ~(bsize - 1)) + bsize;
317 * Check for EOF and read the new leaf.
319 if (fp->f_seekp >= bsize * fp->f_num_leafs)
322 rc = dnode_read(spa, &fp->f_dnode,
330 zc = &ZAP_LEAF_CHUNK(&zl, chunk);
332 if (zc->l_entry.le_type != ZAP_CHUNK_ENTRY)
335 namelen = zc->l_entry.le_name_length;
336 if (namelen > sizeof(d->d_name))
337 namelen = sizeof(d->d_name);
340 * Paste the name back together.
342 nc = &ZAP_LEAF_CHUNK(&zl, zc->l_entry.le_name_chunk);
344 while (namelen > 0) {
347 if (len > ZAP_LEAF_ARRAY_BYTES)
348 len = ZAP_LEAF_ARRAY_BYTES;
349 memcpy(p, nc->l_array.la_array, len);
352 nc = &ZAP_LEAF_CHUNK(&zl, nc->l_array.la_next);
354 d->d_name[sizeof(d->d_name) - 1] = 0;
357 * Assume the first eight bytes of the value are
360 value = fzap_leaf_value(&zl, zc);
362 d->d_fileno = ZFS_DIRENT_OBJ(value);
363 d->d_type = ZFS_DIRENT_TYPE(value);
364 d->d_namlen = strlen(d->d_name);
371 vdev_read(vdev_t *vdev, void *priv, off_t offset, void *buf, size_t size)
375 fd = (uintptr_t) priv;
376 lseek(fd, offset, SEEK_SET);
377 if (read(fd, buf, size) == size) {
385 * Convert a pool guid to a 'unit number' suitable for use with zfs_dev_open.
388 zfs_guid_to_unit(uint64_t guid)
394 STAILQ_FOREACH(spa, &zfs_pools, spa_link) {
395 if (spa->spa_guid == guid)
410 * Open all the disks we can find and see if we can reconstruct
411 * ZFS pools from them. Bogusly assumes that the disks are named
412 * diskN, diskNpM or diskNsM.
415 for (unit = 0; unit < MAXBDDEV; unit++) {
416 sprintf(devname, "disk%d:", unit);
417 fd = open(devname, O_RDONLY);
422 * If we find a vdev, the zfs code will eat the fd, otherwise
425 if (vdev_probe(vdev_read, (void*) (uintptr_t) fd, 0))
428 for (slice = 1; slice <= 128; slice++) {
429 sprintf(devname, "disk%dp%d:", unit, slice);
430 fd = open(devname, O_RDONLY);
432 sprintf(devname, "disk%ds%d:", unit, slice);
433 fd = open(devname, O_RDONLY);
437 if (vdev_probe(vdev_read, (void*) (uintptr_t) fd, 0))
446 * Print information about ZFS pools
449 zfs_dev_print(int verbose)
460 STAILQ_FOREACH(spa, &zfs_pools, spa_link) {
461 sprintf(line, " zfs%d: %s\n", unit, spa->spa_name);
468 * Attempt to open the pool described by (dev) for use by (f).
471 zfs_dev_open(struct open_file *f, ...)
479 dev = va_arg(args, struct devdesc*);
483 * We mostly ignore the stuff that devopen sends us. For now,
484 * use the unit to find a pool - later we will override the
485 * devname parsing so that we can name a pool and a fs within
491 STAILQ_FOREACH(spa, &zfs_pools, spa_link) {
506 zfs_dev_close(struct open_file *f)
514 zfs_dev_strategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, size_t *rsize)
520 struct devsw zfs_dev = {
523 .dv_init = zfs_dev_init,
524 .dv_strategy = zfs_dev_strategy,
525 .dv_open = zfs_dev_open,
526 .dv_close = zfs_dev_close,
528 .dv_print = zfs_dev_print,