d6f289d443
to gptboot, i.e. installed in a freebsd-boot partition using /sbin/gpart or /sbin/gpt. Tweak the /boot/loader ZFS support so that it can find ZFS pools that are contained in GPT partitions.
519 lines
11 KiB
C
519 lines
11 KiB
C
/*-
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* Copyright (c) 2007 Doug Rabson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Stand-alone file reading package.
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*/
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#include <sys/param.h>
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#include <sys/disklabel.h>
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#include <sys/time.h>
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#include <sys/queue.h>
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#include <stddef.h>
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#include <stdarg.h>
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#include <string.h>
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#include <stand.h>
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#include <bootstrap.h>
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#include "zfsimpl.c"
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static int zfs_open(const char *path, struct open_file *f);
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static int zfs_write(struct open_file *f, void *buf, size_t size, size_t *resid);
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static int zfs_close(struct open_file *f);
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static int zfs_read(struct open_file *f, void *buf, size_t size, size_t *resid);
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static off_t zfs_seek(struct open_file *f, off_t offset, int where);
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static int zfs_stat(struct open_file *f, struct stat *sb);
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static int zfs_readdir(struct open_file *f, struct dirent *d);
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struct devsw zfs_dev;
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struct fs_ops zfs_fsops = {
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"zfs",
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zfs_open,
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zfs_close,
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zfs_read,
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zfs_write,
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zfs_seek,
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zfs_stat,
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zfs_readdir
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};
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/*
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* In-core open file.
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*/
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struct file {
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off_t f_seekp; /* seek pointer */
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dnode_phys_t f_dnode;
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uint64_t f_zap_type; /* zap type for readdir */
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uint64_t f_num_leafs; /* number of fzap leaf blocks */
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zap_leaf_phys_t *f_zap_leaf; /* zap leaf buffer */
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};
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/*
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* Open a file.
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*/
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static int
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zfs_open(const char *upath, struct open_file *f)
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{
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spa_t *spa = (spa_t *) f->f_devdata;
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struct file *fp;
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int rc;
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if (f->f_dev != &zfs_dev)
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return (EINVAL);
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rc = zfs_mount_pool(spa);
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if (rc)
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return (rc);
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/* allocate file system specific data structure */
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fp = malloc(sizeof(struct file));
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bzero(fp, sizeof(struct file));
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f->f_fsdata = (void *)fp;
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if (spa->spa_root_objset.os_type != DMU_OST_ZFS) {
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printf("Unexpected object set type %lld\n",
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spa->spa_root_objset.os_type);
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rc = EIO;
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goto out;
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}
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rc = zfs_lookup(spa, upath, &fp->f_dnode);
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if (rc)
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goto out;
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fp->f_seekp = 0;
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out:
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if (rc) {
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f->f_fsdata = NULL;
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free(fp);
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}
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return (rc);
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}
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static int
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zfs_close(struct open_file *f)
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{
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struct file *fp = (struct file *)f->f_fsdata;
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dnode_cache_obj = 0;
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f->f_fsdata = (void *)0;
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if (fp == (struct file *)0)
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return (0);
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free(fp);
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return (0);
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}
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/*
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* Copy a portion of a file into kernel memory.
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* Cross block boundaries when necessary.
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*/
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static int
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zfs_read(struct open_file *f, void *start, size_t size, size_t *resid /* out */)
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{
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spa_t *spa = (spa_t *) f->f_devdata;
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struct file *fp = (struct file *)f->f_fsdata;
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const znode_phys_t *zp = (const znode_phys_t *) fp->f_dnode.dn_bonus;
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size_t n;
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int rc;
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n = size;
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if (fp->f_seekp + n > zp->zp_size)
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n = zp->zp_size - fp->f_seekp;
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rc = dnode_read(spa, &fp->f_dnode, fp->f_seekp, start, n);
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if (rc)
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return (rc);
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if (0) {
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int i;
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for (i = 0; i < n; i++)
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putchar(((char*) start)[i]);
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}
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fp->f_seekp += n;
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if (resid)
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*resid = size - n;
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return (0);
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}
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/*
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* Don't be silly - the bootstrap has no business writing anything.
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*/
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static int
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zfs_write(struct open_file *f, void *start, size_t size, size_t *resid /* out */)
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{
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return (EROFS);
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}
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static off_t
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zfs_seek(struct open_file *f, off_t offset, int where)
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{
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struct file *fp = (struct file *)f->f_fsdata;
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znode_phys_t *zp = (znode_phys_t *) fp->f_dnode.dn_bonus;
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switch (where) {
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case SEEK_SET:
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fp->f_seekp = offset;
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break;
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case SEEK_CUR:
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fp->f_seekp += offset;
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break;
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case SEEK_END:
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fp->f_seekp = zp->zp_size - offset;
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break;
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default:
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errno = EINVAL;
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return (-1);
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}
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return (fp->f_seekp);
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}
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static int
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zfs_stat(struct open_file *f, struct stat *sb)
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{
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struct file *fp = (struct file *)f->f_fsdata;
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znode_phys_t *zp = (znode_phys_t *) fp->f_dnode.dn_bonus;
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/* only important stuff */
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sb->st_mode = zp->zp_mode;
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sb->st_uid = zp->zp_uid;
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sb->st_gid = zp->zp_gid;
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sb->st_size = zp->zp_size;
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return (0);
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}
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static int
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zfs_readdir(struct open_file *f, struct dirent *d)
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{
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spa_t *spa = (spa_t *) f->f_devdata;
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struct file *fp = (struct file *)f->f_fsdata;
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znode_phys_t *zp = (znode_phys_t *) fp->f_dnode.dn_bonus;
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mzap_ent_phys_t mze;
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size_t bsize = fp->f_dnode.dn_datablkszsec << SPA_MINBLOCKSHIFT;
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int rc;
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if ((zp->zp_mode >> 12) != 0x4) {
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return (ENOTDIR);
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}
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/*
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* If this is the first read, get the zap type.
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*/
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if (fp->f_seekp == 0) {
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rc = dnode_read(spa, &fp->f_dnode,
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0, &fp->f_zap_type, sizeof(fp->f_zap_type));
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if (rc)
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return (rc);
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if (fp->f_zap_type == ZBT_MICRO) {
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fp->f_seekp = offsetof(mzap_phys_t, mz_chunk);
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} else {
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rc = dnode_read(spa, &fp->f_dnode,
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offsetof(zap_phys_t, zap_num_leafs),
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&fp->f_num_leafs,
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sizeof(fp->f_num_leafs));
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if (rc)
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return (rc);
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fp->f_seekp = bsize;
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fp->f_zap_leaf = (zap_leaf_phys_t *)malloc(bsize);
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rc = dnode_read(spa, &fp->f_dnode,
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fp->f_seekp,
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fp->f_zap_leaf,
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bsize);
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if (rc)
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return (rc);
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}
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}
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if (fp->f_zap_type == ZBT_MICRO) {
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mzap_next:
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if (fp->f_seekp >= bsize)
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return (ENOENT);
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rc = dnode_read(spa, &fp->f_dnode,
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fp->f_seekp, &mze, sizeof(mze));
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fp->f_seekp += sizeof(mze);
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if (!mze.mze_name[0])
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goto mzap_next;
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d->d_fileno = ZFS_DIRENT_OBJ(mze.mze_value);
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d->d_type = ZFS_DIRENT_TYPE(mze.mze_value);
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strcpy(d->d_name, mze.mze_name);
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d->d_namlen = strlen(d->d_name);
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return (0);
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} else {
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zap_leaf_t zl;
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zap_leaf_chunk_t *zc, *nc;
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int chunk;
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size_t namelen;
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char *p;
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uint64_t value;
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/*
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* Initialise this so we can use the ZAP size
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* calculating macros.
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*/
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zl.l_bs = ilog2(bsize);
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zl.l_phys = fp->f_zap_leaf;
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/*
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* Figure out which chunk we are currently looking at
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* and consider seeking to the next leaf. We use the
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* low bits of f_seekp as a simple chunk index.
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*/
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fzap_next:
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chunk = fp->f_seekp & (bsize - 1);
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if (chunk == ZAP_LEAF_NUMCHUNKS(&zl)) {
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fp->f_seekp = (fp->f_seekp & ~(bsize - 1)) + bsize;
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chunk = 0;
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/*
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* Check for EOF and read the new leaf.
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*/
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if (fp->f_seekp >= bsize * fp->f_num_leafs)
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return (ENOENT);
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rc = dnode_read(spa, &fp->f_dnode,
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fp->f_seekp,
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fp->f_zap_leaf,
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bsize);
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if (rc)
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return (rc);
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}
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zc = &ZAP_LEAF_CHUNK(&zl, chunk);
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fp->f_seekp++;
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if (zc->l_entry.le_type != ZAP_CHUNK_ENTRY)
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goto fzap_next;
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namelen = zc->l_entry.le_name_length;
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if (namelen > sizeof(d->d_name))
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namelen = sizeof(d->d_name);
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/*
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* Paste the name back together.
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*/
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nc = &ZAP_LEAF_CHUNK(&zl, zc->l_entry.le_name_chunk);
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p = d->d_name;
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while (namelen > 0) {
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int len;
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len = namelen;
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if (len > ZAP_LEAF_ARRAY_BYTES)
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len = ZAP_LEAF_ARRAY_BYTES;
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memcpy(p, nc->l_array.la_array, len);
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p += len;
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namelen -= len;
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nc = &ZAP_LEAF_CHUNK(&zl, nc->l_array.la_next);
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}
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d->d_name[sizeof(d->d_name) - 1] = 0;
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/*
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* Assume the first eight bytes of the value are
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* a uint64_t.
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*/
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value = fzap_leaf_value(&zl, zc);
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d->d_fileno = ZFS_DIRENT_OBJ(value);
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d->d_type = ZFS_DIRENT_TYPE(value);
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d->d_namlen = strlen(d->d_name);
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return (0);
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}
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}
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static int
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vdev_read(vdev_t *vdev, void *priv, off_t offset, void *buf, size_t size)
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{
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int fd;
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fd = (uintptr_t) priv;
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lseek(fd, offset, SEEK_SET);
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if (read(fd, buf, size) == size) {
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return 0;
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} else {
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return (EIO);
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}
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}
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/*
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* Convert a pool guid to a 'unit number' suitable for use with zfs_dev_open.
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*/
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int
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zfs_guid_to_unit(uint64_t guid)
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{
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spa_t *spa;
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int unit;
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unit = 0;
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STAILQ_FOREACH(spa, &zfs_pools, spa_link) {
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if (spa->spa_guid == guid)
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return unit;
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unit++;
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}
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return (-1);
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}
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static int
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zfs_dev_init(void)
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{
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char devname[512];
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int unit, slice;
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int fd;
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/*
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* Open all the disks we can find and see if we can reconstruct
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* ZFS pools from them. Bogusly assumes that the disks are named
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* diskN or diskNsM.
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*/
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zfs_init();
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for (unit = 0; unit < 32 /* XXX */; unit++) {
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sprintf(devname, "disk%d:", unit);
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fd = open(devname, O_RDONLY);
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if (fd == -1)
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continue;
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/*
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* If we find a vdev, the zfs code will eat the fd, otherwise
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* we close it.
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*/
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if (vdev_probe(vdev_read, (void*) (uintptr_t) fd, 0))
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close(fd);
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for (slice = 1; slice <= 4; slice++) {
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sprintf(devname, "disk%dp%d:", unit, slice);
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fd = open(devname, O_RDONLY);
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if (fd == -1) {
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sprintf(devname, "disk%ds%d:", unit, slice);
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fd = open(devname, O_RDONLY);
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if (fd == -1)
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continue;
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}
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if (vdev_probe(vdev_read, (void*) (uintptr_t) fd, 0))
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close(fd);
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}
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}
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return (0);
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}
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/*
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* Print information about ZFS pools
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*/
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static void
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zfs_dev_print(int verbose)
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{
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spa_t *spa;
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char line[80];
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int unit;
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if (verbose) {
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spa_all_status();
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return;
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}
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unit = 0;
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STAILQ_FOREACH(spa, &zfs_pools, spa_link) {
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sprintf(line, " zfs%d: %s\n", unit, spa->spa_name);
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pager_output(line);
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unit++;
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}
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}
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/*
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* Attempt to open the pool described by (dev) for use by (f).
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*/
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static int
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zfs_dev_open(struct open_file *f, ...)
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{
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va_list args;
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struct devdesc *dev;
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int unit, i;
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spa_t *spa;
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va_start(args, f);
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dev = va_arg(args, struct devdesc*);
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va_end(args);
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/*
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* We mostly ignore the stuff that devopen sends us. For now,
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* use the unit to find a pool - later we will override the
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* devname parsing so that we can name a pool and a fs within
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* the pool.
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*/
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unit = dev->d_unit;
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free(dev);
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i = 0;
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STAILQ_FOREACH(spa, &zfs_pools, spa_link) {
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if (i == unit)
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break;
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i++;
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}
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if (!spa) {
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return (ENXIO);
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}
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f->f_devdata = spa;
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return (0);
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}
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static int
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zfs_dev_close(struct open_file *f)
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{
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f->f_devdata = NULL;
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return (0);
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}
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static int
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zfs_dev_strategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, size_t *rsize)
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{
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return (ENOSYS);
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}
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struct devsw zfs_dev = {
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.dv_name = "zfs",
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.dv_type = DEVT_ZFS,
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.dv_init = zfs_dev_init,
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.dv_strategy = zfs_dev_strategy,
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.dv_open = zfs_dev_open,
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.dv_close = zfs_dev_close,
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.dv_ioctl = noioctl,
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.dv_print = zfs_dev_print,
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.dv_cleanup = NULL
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};
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