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>
48 static int zfs_open(const char *path, struct open_file *f);
49 static int zfs_write(struct open_file *f, void *buf, size_t size, size_t *resid);
50 static int zfs_close(struct open_file *f);
51 static int zfs_read(struct open_file *f, void *buf, size_t size, size_t *resid);
52 static off_t zfs_seek(struct open_file *f, off_t offset, int where);
53 static int zfs_stat(struct open_file *f, struct stat *sb);
54 static int zfs_readdir(struct open_file *f, struct dirent *d);
58 struct fs_ops zfs_fsops = {
73 off_t f_seekp; /* seek pointer */
75 uint64_t f_zap_type; /* zap type for readdir */
76 uint64_t f_num_leafs; /* number of fzap leaf blocks */
77 zap_leaf_phys_t *f_zap_leaf; /* zap leaf buffer */
84 zfs_open(const char *upath, struct open_file *f)
86 spa_t *spa = (spa_t *) f->f_devdata;
90 if (f->f_dev != &zfs_dev)
93 rc = zfs_mount_pool(spa);
97 /* allocate file system specific data structure */
98 fp = malloc(sizeof(struct file));
99 bzero(fp, sizeof(struct file));
100 f->f_fsdata = (void *)fp;
102 if (spa->spa_root_objset.os_type != DMU_OST_ZFS) {
103 printf("Unexpected object set type %llu\n",
104 spa->spa_root_objset.os_type);
109 rc = zfs_lookup(spa, upath, &fp->f_dnode);
123 zfs_close(struct open_file *f)
125 struct file *fp = (struct file *)f->f_fsdata;
128 f->f_fsdata = (void *)0;
129 if (fp == (struct file *)0)
137 * Copy a portion of a file into kernel memory.
138 * Cross block boundaries when necessary.
141 zfs_read(struct open_file *f, void *start, size_t size, size_t *resid /* out */)
143 spa_t *spa = (spa_t *) f->f_devdata;
144 struct file *fp = (struct file *)f->f_fsdata;
149 rc = zfs_stat(f, &sb);
153 if (fp->f_seekp + n > sb.st_size)
154 n = sb.st_size - fp->f_seekp;
156 rc = dnode_read(spa, &fp->f_dnode, fp->f_seekp, start, n);
162 for (i = 0; i < n; i++)
163 putchar(((char*) start)[i]);
173 * Don't be silly - the bootstrap has no business writing anything.
176 zfs_write(struct open_file *f, void *start, size_t size, size_t *resid /* out */)
183 zfs_seek(struct open_file *f, off_t offset, int where)
185 struct file *fp = (struct file *)f->f_fsdata;
189 fp->f_seekp = offset;
192 fp->f_seekp += offset;
199 error = zfs_stat(f, &sb);
204 fp->f_seekp = sb.st_size - offset;
211 return (fp->f_seekp);
215 zfs_stat(struct open_file *f, struct stat *sb)
217 spa_t *spa = (spa_t *) f->f_devdata;
218 struct file *fp = (struct file *)f->f_fsdata;
220 return (zfs_dnode_stat(spa, &fp->f_dnode, sb));
224 zfs_readdir(struct open_file *f, struct dirent *d)
226 spa_t *spa = (spa_t *) f->f_devdata;
227 struct file *fp = (struct file *)f->f_fsdata;
230 size_t bsize = fp->f_dnode.dn_datablkszsec << SPA_MINBLOCKSHIFT;
233 rc = zfs_stat(f, &sb);
236 if (!S_ISDIR(sb.st_mode))
240 * If this is the first read, get the zap type.
242 if (fp->f_seekp == 0) {
243 rc = dnode_read(spa, &fp->f_dnode,
244 0, &fp->f_zap_type, sizeof(fp->f_zap_type));
248 if (fp->f_zap_type == ZBT_MICRO) {
249 fp->f_seekp = offsetof(mzap_phys_t, mz_chunk);
251 rc = dnode_read(spa, &fp->f_dnode,
252 offsetof(zap_phys_t, zap_num_leafs),
254 sizeof(fp->f_num_leafs));
259 fp->f_zap_leaf = (zap_leaf_phys_t *)malloc(bsize);
260 rc = dnode_read(spa, &fp->f_dnode,
269 if (fp->f_zap_type == ZBT_MICRO) {
271 if (fp->f_seekp >= bsize)
274 rc = dnode_read(spa, &fp->f_dnode,
275 fp->f_seekp, &mze, sizeof(mze));
278 fp->f_seekp += sizeof(mze);
280 if (!mze.mze_name[0])
283 d->d_fileno = ZFS_DIRENT_OBJ(mze.mze_value);
284 d->d_type = ZFS_DIRENT_TYPE(mze.mze_value);
285 strcpy(d->d_name, mze.mze_name);
286 d->d_namlen = strlen(d->d_name);
290 zap_leaf_chunk_t *zc, *nc;
297 * Initialise this so we can use the ZAP size
298 * calculating macros.
300 zl.l_bs = ilog2(bsize);
301 zl.l_phys = fp->f_zap_leaf;
304 * Figure out which chunk we are currently looking at
305 * and consider seeking to the next leaf. We use the
306 * low bits of f_seekp as a simple chunk index.
309 chunk = fp->f_seekp & (bsize - 1);
310 if (chunk == ZAP_LEAF_NUMCHUNKS(&zl)) {
311 fp->f_seekp = (fp->f_seekp & ~(bsize - 1)) + bsize;
315 * Check for EOF and read the new leaf.
317 if (fp->f_seekp >= bsize * fp->f_num_leafs)
320 rc = dnode_read(spa, &fp->f_dnode,
328 zc = &ZAP_LEAF_CHUNK(&zl, chunk);
330 if (zc->l_entry.le_type != ZAP_CHUNK_ENTRY)
333 namelen = zc->l_entry.le_name_length;
334 if (namelen > sizeof(d->d_name))
335 namelen = sizeof(d->d_name);
338 * Paste the name back together.
340 nc = &ZAP_LEAF_CHUNK(&zl, zc->l_entry.le_name_chunk);
342 while (namelen > 0) {
345 if (len > ZAP_LEAF_ARRAY_BYTES)
346 len = ZAP_LEAF_ARRAY_BYTES;
347 memcpy(p, nc->l_array.la_array, len);
350 nc = &ZAP_LEAF_CHUNK(&zl, nc->l_array.la_next);
352 d->d_name[sizeof(d->d_name) - 1] = 0;
355 * Assume the first eight bytes of the value are
358 value = fzap_leaf_value(&zl, zc);
360 d->d_fileno = ZFS_DIRENT_OBJ(value);
361 d->d_type = ZFS_DIRENT_TYPE(value);
362 d->d_namlen = strlen(d->d_name);
369 vdev_read(vdev_t *vdev, void *priv, off_t offset, void *buf, size_t size)
373 fd = (uintptr_t) priv;
374 lseek(fd, offset, SEEK_SET);
375 if (read(fd, buf, size) == size) {
383 * Convert a pool guid to a 'unit number' suitable for use with zfs_dev_open.
386 zfs_guid_to_unit(uint64_t guid)
392 STAILQ_FOREACH(spa, &zfs_pools, spa_link) {
393 if (spa->spa_guid == guid)
408 * Open all the disks we can find and see if we can reconstruct
409 * ZFS pools from them. Bogusly assumes that the disks are named
410 * diskN, diskNpM or diskNsM.
413 for (unit = 0; unit < 32 /* XXX */; unit++) {
414 sprintf(devname, "disk%d:", unit);
415 fd = open(devname, O_RDONLY);
420 * If we find a vdev, the zfs code will eat the fd, otherwise
423 if (vdev_probe(vdev_read, (void*) (uintptr_t) fd, 0))
426 for (slice = 1; slice <= 128; slice++) {
427 sprintf(devname, "disk%dp%d:", unit, slice);
428 fd = open(devname, O_RDONLY);
430 sprintf(devname, "disk%ds%d:", unit, slice);
431 fd = open(devname, O_RDONLY);
435 if (vdev_probe(vdev_read, (void*) (uintptr_t) fd, 0))
444 * Print information about ZFS pools
447 zfs_dev_print(int verbose)
458 STAILQ_FOREACH(spa, &zfs_pools, spa_link) {
459 sprintf(line, " zfs%d: %s\n", unit, spa->spa_name);
466 * Attempt to open the pool described by (dev) for use by (f).
469 zfs_dev_open(struct open_file *f, ...)
477 dev = va_arg(args, struct devdesc*);
481 * We mostly ignore the stuff that devopen sends us. For now,
482 * use the unit to find a pool - later we will override the
483 * devname parsing so that we can name a pool and a fs within
489 STAILQ_FOREACH(spa, &zfs_pools, spa_link) {
504 zfs_dev_close(struct open_file *f)
512 zfs_dev_strategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, size_t *rsize)
518 struct devsw zfs_dev = {
521 .dv_init = zfs_dev_init,
522 .dv_strategy = zfs_dev_strategy,
523 .dv_open = zfs_dev_open,
524 .dv_close = zfs_dev_close,
526 .dv_print = zfs_dev_print,