Differential D4104 Diff 10875 sys/boot/efi/boot1/zfs_module.c

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sys/boot/efi/boot1/zfs_module.c

Property	Old Value	New Value
svn:eol-style	null	native \ No newline at end of property
svn:keywords	null	FreeBSD=%H \ No newline at end of property
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				/* Copyright (c) 2015 Eric McCorkle. All rights reserved.
				*
				* Redistribution and use in source and binary forms, with or without
				* modification, are permitted provided that the following conditions
				* are met:
				*
				* 1. Redistributions of source code must retain the above copyright
				* notice, this list of conditions and the following disclaimer.
				*
				* 2. Redistributions in binary form must reproduce the above
				* copyright notice, this list of conditions and the following
				* disclaimer in the documentation and/or other materials provided
				* with the distribution.
				*
				* 3. Neither the name of the author nor the names of any contributors
				* may be used to endorse or promote products derived from this
				* software without specific prior written permission.
				*
				emasteUnsubmitted Done Inline Actions Would you be willing to use a stock 2-clause FreeBSD license for consistency? emaste: Would you be willing to use a stock 2-clause FreeBSD license for consistency?
				* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS''
				eric_metricspace.netAuthorUnsubmitted Not Done Inline Actions Yes. This was just a stock header I add to all my BSD-licensed projects. eric_metricspace.net: Yes. This was just a stock header I add to all my BSD-licensed projects.
				* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
				* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
				* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR
				* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
				* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
				* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
				* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
				* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
				* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
				* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
				* SUCH DAMAGE.
				*/
				#include <stddef.h>
				#include <stdarg.h>
				#include <stdbool.h>

				#include <sys/cdefs.h>
				#include <sys/param.h>
				#include <sys/queue.h>

				#include <efi.h>

				#include "boot_module.h"

				#include "libzfs.h"
				#include "zfsimpl.c"

				#define PATH_CONFIG "/boot/config"
				#define PATH_DOTCONFIG "/boot/.config"

				static EFI_HANDLE image;
				static EFI_SYSTEM_TABLE* systab;
				static EFI_BOOT_SERVICES *bootsrv;

				static int
				vdev_read(vdev_t vdev, void priv, off_t off, void *buf, size_t bytes)
				{
				const dev_info_t * const devinfo = (const dev_info_t *) priv;
				const off_t lba = off / devinfo->dev->Media->BlockSize;
				const EFI_STATUS status =
				devinfo->dev->ReadBlocks(devinfo->dev,
				avgUnsubmitted Done Inline Actions Here and at many other places function arguments are written in a way that is not customary for the FreeBSD code. Usually we introduce new lines only when running over 80 symbols limit and the continuation lines have additional 4-space indentation. avg: Here and at many other places function arguments are written in a way that is not customary for…
				avgUnsubmitted Done Inline Actions Also, `const` could be considered unneeded in this function signature. It means that e.g. `vdev` can not be changed, but it does not mean that the struct that `vdev` points to can not be changed. Also, any change to `vdev` would not be visible to the callers. Perhaps you meant to write `const vdev_t vdev` here? Same for the rest of parameters. avg:* Also, `const` could be considered unneeded in this function signature. It means that e.g.
				devinfo->dev->Media->MediaId,
				eric_metricspace.netAuthorUnsubmitted Not Done Inline Actions I habitually declare everything const. I've removed those from the argument lists. eric_metricspace.net: I habitually declare everything const. I've removed those from the argument lists.
				lba, bytes, buf);
				avgUnsubmitted Done Inline Actions Not sure if it is really benefitial to enforce that the value of `devinfo`can not be changed in such a short and trivial function. In any case, there should be a space between the type name and ``. avg:* Not sure if it is really benefitial to enforce that the value of `devinfo`can not be changed in…
				if (EFI_ERROR(status))
				return (-1);

				return (0);
				}

				static bool
				probe(dev_info_t *dev)
				{
				spa_t *spa;
				int result = vdev_probe(vdev_read, dev, &spa);
				dev->devdata = spa;

				return result == 0;
				avgUnsubmitted Done Inline Actions We attach `` to the variable, not to the type. avg:* We attach `*` to the variable, not to the type.
				}

				static void*
				try_load(dev_info_t devinfo, const char loader_path, size_t bufsizeref)
				{
				spa_t *spa = devinfo.devdata;
				struct zfsmount zfsmount;
				dnode_phys_t dn;
				bool autoboot = true;

				if (zfs_spa_init(spa) != 0)
				// Mount failed. Don't report this loudly
				return NULL;

				// First, try mounting the ZFS volume
				if (zfs_mount(spa, 0, &zfsmount) != 0)
				// Mount failed. Don't report this loudly
				return NULL;

				if (zfs_lookup(&zfsmount, loader_path, &dn) != 0)
				return NULL;

				struct stat st;
				if (zfs_dnode_stat(spa, &dn, &st))
				return NULL;

				const size_t bufsize = st.st_size;
				void *buffer;
				EFI_STATUS status;

				*bufsizeref = bufsize;

				if (systab->BootServices->AllocatePool(EfiLoaderData,
				bufsize, &buffer) !=
				EFI_SUCCESS)
				return NULL;

				if (dnode_read(spa, &dn, 0, buffer, bufsize) < 0)
				return NULL;

				return buffer;
				}

				static int
				zfs_mount_ds(const char dsname, struct zfsmount zfsmount, spa_t **spa)
				{
				uint64_t newroot;
				spa_t *newspa;
				char *q;

				q = strchr(dsname, '/');
				if (q)
				*q++ = '\0';
				newspa = spa_find_by_name(dsname);
				if (newspa == NULL) {
				printf("\nCan't find ZFS pool %s\n", dsname);
				return -1;
				}

				if (zfs_spa_init(newspa))
				return -1;

				newroot = 0;
				if (q) {
				if (zfs_lookup_dataset(newspa, q, &newroot)) {
				printf("\nCan't find dataset %s in ZFS pool %s\n",
				q, newspa->spa_name);
				return -1;
				}
				}
				if (zfs_mount(newspa, newroot, zfsmount)) {
				printf("\nCan't mount ZFS dataset\n");
				return -1;
				}
				*spa = newspa;
				return (0);
				}

				static void*
				load(const dev_info_t devs[], size_t ndevs, const char *loader_path,
				int idxref, size_t bufsizeref)
				{
				for(int i = 0; i < ndevs; i++) {
				void * const out = try_load(devs[i], loader_path, bufsizeref);
				if (out != NULL) {
				*idxref = i;
				return out;
				}
				}
				return NULL;
				}

				static void
				init(EFI_HANDLE xImage, EFI_SYSTEM_TABLE xSystab, EFI_BOOT_SERVICES xBootsrv)
				{
				image = xImage;
				systab = xSystab;
				bootsrv = xBootsrv;
				zfs_init();
				}

				const boot_module_t zfs_module =
				{
				.name = "ZFS",
				.init = init,
				.probe = probe,
				.load = load
				};