be used on both macOS and Linux. STAILQs are not. In particular, STAILQ_LAST does not next on Linux. Since neither STAILQ_FOREACH_SAFE nor TAILQ_FOREACH_SAFE exist on Linux, replace its use with a regular TAILQ_FOREACH. The _SAFE variant was only used for having the next pointer in a local variable.
744 lines
15 KiB
C
744 lines
15 KiB
C
/*-
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* Copyright (c) 2014 Juniper Networks, Inc.
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/mman.h>
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#include <sys/queue.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <assert.h>
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#include <err.h>
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#include <errno.h>
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#include <limits.h>
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#include <paths.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "image.h"
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#include "mkimg.h"
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#ifndef MAP_NOCORE
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#define MAP_NOCORE 0
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#endif
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#ifndef MAP_NOSYNC
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#define MAP_NOSYNC 0
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#endif
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#ifndef SEEK_DATA
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#define SEEK_DATA -1
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#endif
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#ifndef SEEK_HOLE
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#define SEEK_HOLE -1
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#endif
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struct chunk {
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TAILQ_ENTRY(chunk) ch_list;
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size_t ch_size; /* Size of chunk in bytes. */
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lba_t ch_block; /* Block address in image. */
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union {
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struct {
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off_t ofs; /* Offset in backing file. */
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int fd; /* FD of backing file. */
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} file;
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struct {
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void *ptr; /* Pointer to data in memory */
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} mem;
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} ch_u;
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u_int ch_type;
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#define CH_TYPE_ZEROES 0 /* Chunk is a gap (no data). */
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#define CH_TYPE_FILE 1 /* File-backed chunk. */
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#define CH_TYPE_MEMORY 2 /* Memory-backed chunk */
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};
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static TAILQ_HEAD(chunk_head, chunk) image_chunks;
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static u_int image_nchunks;
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static char image_swap_file[PATH_MAX];
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static int image_swap_fd = -1;
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static u_int image_swap_pgsz;
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static off_t image_swap_size;
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static lba_t image_size;
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static int
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is_empty_sector(void *buf)
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{
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uint64_t *p = buf;
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size_t n, max;
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assert(((uintptr_t)p & 3) == 0);
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max = secsz / sizeof(uint64_t);
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for (n = 0; n < max; n++) {
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if (p[n] != 0UL)
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return (0);
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}
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return (1);
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}
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/*
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* Swap file handlng.
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*/
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static off_t
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image_swap_alloc(size_t size)
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{
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off_t ofs;
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size_t unit;
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unit = (secsz > image_swap_pgsz) ? secsz : image_swap_pgsz;
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assert((unit & (unit - 1)) == 0);
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size = (size + unit - 1) & ~(unit - 1);
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ofs = image_swap_size;
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image_swap_size += size;
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if (ftruncate(image_swap_fd, image_swap_size) == -1) {
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image_swap_size = ofs;
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ofs = -1LL;
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}
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return (ofs);
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}
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/*
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* Image chunk handling.
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*/
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static struct chunk *
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image_chunk_find(lba_t blk)
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{
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static struct chunk *last = NULL;
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struct chunk *ch;
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ch = (last != NULL && last->ch_block <= blk)
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? last : TAILQ_FIRST(&image_chunks);
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while (ch != NULL) {
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if (ch->ch_block <= blk &&
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(lba_t)(ch->ch_block + (ch->ch_size / secsz)) > blk) {
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last = ch;
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break;
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}
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ch = TAILQ_NEXT(ch, ch_list);
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}
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return (ch);
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}
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static size_t
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image_chunk_grow(struct chunk *ch, size_t sz)
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{
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size_t dsz, newsz;
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newsz = ch->ch_size + sz;
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if (newsz > ch->ch_size) {
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ch->ch_size = newsz;
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return (0);
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}
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/* We would overflow -- create new chunk for remainder. */
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dsz = SIZE_MAX - ch->ch_size;
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assert(dsz < sz);
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ch->ch_size = SIZE_MAX;
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return (sz - dsz);
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}
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static struct chunk *
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image_chunk_memory(struct chunk *ch, lba_t blk)
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{
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struct chunk *new;
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void *ptr;
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ptr = calloc(1, secsz);
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if (ptr == NULL)
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return (NULL);
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if (ch->ch_block < blk) {
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new = malloc(sizeof(*new));
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if (new == NULL) {
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free(ptr);
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return (NULL);
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}
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memcpy(new, ch, sizeof(*new));
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ch->ch_size = (blk - ch->ch_block) * secsz;
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new->ch_block = blk;
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new->ch_size -= ch->ch_size;
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TAILQ_INSERT_AFTER(&image_chunks, ch, new, ch_list);
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image_nchunks++;
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ch = new;
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}
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if (ch->ch_size > secsz) {
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new = malloc(sizeof(*new));
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if (new == NULL) {
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free(ptr);
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return (NULL);
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}
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memcpy(new, ch, sizeof(*new));
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ch->ch_size = secsz;
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new->ch_block++;
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new->ch_size -= secsz;
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TAILQ_INSERT_AFTER(&image_chunks, ch, new, ch_list);
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image_nchunks++;
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}
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ch->ch_type = CH_TYPE_MEMORY;
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ch->ch_u.mem.ptr = ptr;
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return (ch);
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}
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static int
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image_chunk_skipto(lba_t to)
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{
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struct chunk *ch;
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lba_t from;
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size_t sz;
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ch = TAILQ_LAST(&image_chunks, chunk_head);
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from = (ch != NULL) ? ch->ch_block + (ch->ch_size / secsz) : 0LL;
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assert(from <= to);
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/* Nothing to do? */
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if (from == to)
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return (0);
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/* Avoid bugs due to overflows. */
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if ((uintmax_t)(to - from) > (uintmax_t)(SIZE_MAX / secsz))
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return (EFBIG);
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sz = (to - from) * secsz;
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if (ch != NULL && ch->ch_type == CH_TYPE_ZEROES) {
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sz = image_chunk_grow(ch, sz);
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if (sz == 0)
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return (0);
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from = ch->ch_block + (ch->ch_size / secsz);
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}
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ch = malloc(sizeof(*ch));
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if (ch == NULL)
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return (ENOMEM);
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memset(ch, 0, sizeof(*ch));
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ch->ch_block = from;
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ch->ch_size = sz;
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ch->ch_type = CH_TYPE_ZEROES;
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TAILQ_INSERT_TAIL(&image_chunks, ch, ch_list);
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image_nchunks++;
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return (0);
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}
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static int
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image_chunk_append(lba_t blk, size_t sz, off_t ofs, int fd)
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{
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struct chunk *ch;
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ch = TAILQ_LAST(&image_chunks, chunk_head);
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if (ch != NULL && ch->ch_type == CH_TYPE_FILE) {
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if (fd == ch->ch_u.file.fd &&
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blk == (lba_t)(ch->ch_block + (ch->ch_size / secsz)) &&
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ofs == (off_t)(ch->ch_u.file.ofs + ch->ch_size)) {
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sz = image_chunk_grow(ch, sz);
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if (sz == 0)
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return (0);
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blk = ch->ch_block + (ch->ch_size / secsz);
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ofs = ch->ch_u.file.ofs + ch->ch_size;
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}
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}
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ch = malloc(sizeof(*ch));
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if (ch == NULL)
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return (ENOMEM);
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memset(ch, 0, sizeof(*ch));
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ch->ch_block = blk;
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ch->ch_size = sz;
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ch->ch_type = CH_TYPE_FILE;
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ch->ch_u.file.ofs = ofs;
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ch->ch_u.file.fd = fd;
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TAILQ_INSERT_TAIL(&image_chunks, ch, ch_list);
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image_nchunks++;
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return (0);
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}
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static int
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image_chunk_copyin(lba_t blk, void *buf, size_t sz, off_t ofs, int fd)
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{
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uint8_t *p = buf;
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int error;
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error = 0;
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sz = (sz + secsz - 1) & ~(secsz - 1);
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while (!error && sz > 0) {
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if (is_empty_sector(p))
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error = image_chunk_skipto(blk + 1);
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else
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error = image_chunk_append(blk, secsz, ofs, fd);
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blk++;
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p += secsz;
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sz -= secsz;
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ofs += secsz;
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}
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return (error);
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}
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/*
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* File mapping support.
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*/
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static void *
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image_file_map(int fd, off_t ofs, size_t sz)
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{
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void *ptr;
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size_t unit;
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int flags, prot;
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unit = (secsz > image_swap_pgsz) ? secsz : image_swap_pgsz;
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assert((unit & (unit - 1)) == 0);
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flags = MAP_NOCORE | MAP_NOSYNC | MAP_SHARED;
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/* Allow writing to our swap file only. */
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prot = PROT_READ | ((fd == image_swap_fd) ? PROT_WRITE : 0);
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sz = (sz + unit - 1) & ~(unit - 1);
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ptr = mmap(NULL, sz, prot, flags, fd, ofs);
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return ((ptr == MAP_FAILED) ? NULL : ptr);
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}
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static int
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image_file_unmap(void *buffer, size_t sz)
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{
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size_t unit;
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unit = (secsz > image_swap_pgsz) ? secsz : image_swap_pgsz;
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sz = (sz + unit - 1) & ~(unit - 1);
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if (madvise(buffer, sz, MADV_DONTNEED) != 0)
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warn("madvise");
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munmap(buffer, sz);
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return (0);
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}
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/*
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* Input/source file handling.
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*/
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static int
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image_copyin_stream(lba_t blk, int fd, uint64_t *sizep)
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{
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char *buffer;
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uint64_t bytesize;
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off_t swofs;
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size_t iosz;
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ssize_t rdsz;
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int error;
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/*
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* This makes sure we're doing I/O in multiples of the page
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* size as well as of the sector size. 2MB is the minimum
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* by virtue of secsz at least 512 bytes and the page size
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* at least 4K bytes.
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*/
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iosz = secsz * image_swap_pgsz;
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bytesize = 0;
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do {
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swofs = image_swap_alloc(iosz);
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if (swofs == -1LL)
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return (errno);
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buffer = image_file_map(image_swap_fd, swofs, iosz);
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if (buffer == NULL)
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return (errno);
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rdsz = read(fd, buffer, iosz);
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if (rdsz > 0)
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error = image_chunk_copyin(blk, buffer, rdsz, swofs,
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image_swap_fd);
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else if (rdsz < 0)
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error = errno;
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else
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error = 0;
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image_file_unmap(buffer, iosz);
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/* XXX should we relinguish unused swap space? */
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if (error)
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return (error);
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bytesize += rdsz;
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blk += (rdsz + secsz - 1) / secsz;
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} while (rdsz > 0);
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if (sizep != NULL)
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*sizep = bytesize;
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return (0);
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}
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static int
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image_copyin_mapped(lba_t blk, int fd, uint64_t *sizep)
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{
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off_t cur, data, end, hole, pos;
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void *buf;
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uint64_t bytesize;
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size_t iosz, sz;
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int error;
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/*
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* We'd like to know the size of the file and we must
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* be able to seek in order to mmap(2). If this isn't
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* possible, then treat the file as a stream/pipe.
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*/
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end = lseek(fd, 0L, SEEK_END);
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if (end == -1L)
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return (image_copyin_stream(blk, fd, sizep));
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/*
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* We need the file opened for the duration and our
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* caller is going to close the file. Make a dup(2)
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* so that control the faith of the descriptor.
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*/
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fd = dup(fd);
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if (fd == -1)
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return (errno);
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iosz = secsz * image_swap_pgsz;
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bytesize = 0;
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cur = pos = 0;
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error = 0;
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while (!error && cur < end) {
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hole = lseek(fd, cur, SEEK_HOLE);
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if (hole == -1)
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hole = end;
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data = lseek(fd, cur, SEEK_DATA);
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if (data == -1)
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data = end;
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/*
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* Treat the entire file as data if sparse files
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* are not supported by the underlying file system.
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*/
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if (hole == end && data == end)
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data = cur;
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if (cur == hole && data > hole) {
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hole = pos;
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pos = data & ~((uint64_t)secsz - 1);
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blk += (pos - hole) / secsz;
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error = image_chunk_skipto(blk);
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bytesize += pos - hole;
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cur = data;
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} else if (cur == data && hole > data) {
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data = pos;
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pos = (hole + secsz - 1) & ~((uint64_t)secsz - 1);
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while (data < pos) {
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sz = (pos - data > (off_t)iosz)
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? iosz : (size_t)(pos - data);
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buf = image_file_map(fd, data, sz);
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if (buf != NULL) {
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error = image_chunk_copyin(blk, buf,
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sz, data, fd);
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image_file_unmap(buf, sz);
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} else
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error = errno;
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blk += sz / secsz;
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bytesize += sz;
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data += sz;
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}
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cur = hole;
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} else {
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/*
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* I don't know what this means or whether it
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* can happen at all...
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*/
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assert(0);
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}
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}
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if (error)
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close(fd);
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if (!error && sizep != NULL)
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*sizep = bytesize;
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return (error);
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}
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|
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int
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image_copyin(lba_t blk, int fd, uint64_t *sizep)
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{
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struct stat sb;
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int error;
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error = image_chunk_skipto(blk);
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if (!error) {
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if (fstat(fd, &sb) == -1 || !S_ISREG(sb.st_mode))
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error = image_copyin_stream(blk, fd, sizep);
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else
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error = image_copyin_mapped(blk, fd, sizep);
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}
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return (error);
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}
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|
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/*
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|
* Output/sink file handling.
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|
*/
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int
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image_copyout(int fd)
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{
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int error;
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error = image_copyout_region(fd, 0, image_size);
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if (!error)
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error = image_copyout_done(fd);
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return (error);
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}
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int
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image_copyout_done(int fd)
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{
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off_t ofs;
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int error;
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ofs = lseek(fd, 0L, SEEK_CUR);
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if (ofs == -1)
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return (0);
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error = (ftruncate(fd, ofs) == -1) ? errno : 0;
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return (error);
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}
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|
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static int
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image_copyout_memory(int fd, size_t size, void *ptr)
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{
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if (write(fd, ptr, size) == -1)
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return (errno);
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return (0);
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}
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|
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int
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image_copyout_zeroes(int fd, size_t count)
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{
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static uint8_t *zeroes = NULL;
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size_t sz;
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int error;
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|
|
if (lseek(fd, (off_t)count, SEEK_CUR) != -1)
|
|
return (0);
|
|
|
|
/*
|
|
* If we can't seek, we must write.
|
|
*/
|
|
|
|
if (zeroes == NULL) {
|
|
zeroes = calloc(1, secsz);
|
|
if (zeroes == NULL)
|
|
return (ENOMEM);
|
|
}
|
|
|
|
while (count > 0) {
|
|
sz = (count > secsz) ? secsz : count;
|
|
error = image_copyout_memory(fd, sz, zeroes);
|
|
if (error)
|
|
return (error);
|
|
count -= sz;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
image_copyout_file(int fd, size_t size, int ifd, off_t iofs)
|
|
{
|
|
void *buf;
|
|
size_t iosz, sz;
|
|
int error;
|
|
|
|
iosz = secsz * image_swap_pgsz;
|
|
|
|
while (size > 0) {
|
|
sz = (size > iosz) ? iosz : size;
|
|
buf = image_file_map(ifd, iofs, sz);
|
|
if (buf == NULL)
|
|
return (errno);
|
|
error = image_copyout_memory(fd, sz, buf);
|
|
image_file_unmap(buf, sz);
|
|
if (error)
|
|
return (error);
|
|
size -= sz;
|
|
iofs += sz;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
image_copyout_region(int fd, lba_t blk, lba_t size)
|
|
{
|
|
struct chunk *ch;
|
|
size_t ofs, sz;
|
|
int error;
|
|
|
|
size *= secsz;
|
|
|
|
error = 0;
|
|
while (!error && size > 0) {
|
|
ch = image_chunk_find(blk);
|
|
if (ch == NULL) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
ofs = (blk - ch->ch_block) * secsz;
|
|
sz = ch->ch_size - ofs;
|
|
sz = ((lba_t)sz < size) ? sz : (size_t)size;
|
|
switch (ch->ch_type) {
|
|
case CH_TYPE_ZEROES:
|
|
error = image_copyout_zeroes(fd, sz);
|
|
break;
|
|
case CH_TYPE_FILE:
|
|
error = image_copyout_file(fd, sz, ch->ch_u.file.fd,
|
|
ch->ch_u.file.ofs + ofs);
|
|
break;
|
|
case CH_TYPE_MEMORY:
|
|
error = image_copyout_memory(fd, sz, ch->ch_u.mem.ptr);
|
|
break;
|
|
default:
|
|
assert(0);
|
|
}
|
|
size -= sz;
|
|
blk += sz / secsz;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
image_data(lba_t blk, lba_t size)
|
|
{
|
|
struct chunk *ch;
|
|
lba_t lim;
|
|
|
|
while (1) {
|
|
ch = image_chunk_find(blk);
|
|
if (ch == NULL)
|
|
return (0);
|
|
if (ch->ch_type != CH_TYPE_ZEROES)
|
|
return (1);
|
|
lim = ch->ch_block + (ch->ch_size / secsz);
|
|
if (lim >= blk + size)
|
|
return (0);
|
|
size -= lim - blk;
|
|
blk = lim;
|
|
}
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
lba_t
|
|
image_get_size(void)
|
|
{
|
|
|
|
return (image_size);
|
|
}
|
|
|
|
int
|
|
image_set_size(lba_t blk)
|
|
{
|
|
int error;
|
|
|
|
error = image_chunk_skipto(blk);
|
|
if (!error)
|
|
image_size = blk;
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
image_write(lba_t blk, void *buf, ssize_t len)
|
|
{
|
|
struct chunk *ch;
|
|
|
|
while (len > 0) {
|
|
if (!is_empty_sector(buf)) {
|
|
ch = image_chunk_find(blk);
|
|
if (ch == NULL)
|
|
return (ENXIO);
|
|
/* We may not be able to write to files. */
|
|
if (ch->ch_type == CH_TYPE_FILE)
|
|
return (EINVAL);
|
|
if (ch->ch_type == CH_TYPE_ZEROES) {
|
|
ch = image_chunk_memory(ch, blk);
|
|
if (ch == NULL)
|
|
return (ENOMEM);
|
|
}
|
|
assert(ch->ch_type == CH_TYPE_MEMORY);
|
|
memcpy(ch->ch_u.mem.ptr, buf, secsz);
|
|
}
|
|
blk++;
|
|
buf = (char *)buf + secsz;
|
|
len--;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
image_cleanup(void)
|
|
{
|
|
struct chunk *ch;
|
|
|
|
while ((ch = TAILQ_FIRST(&image_chunks)) != NULL) {
|
|
switch (ch->ch_type) {
|
|
case CH_TYPE_FILE:
|
|
/* We may be closing the same file multiple times. */
|
|
if (ch->ch_u.file.fd != -1)
|
|
close(ch->ch_u.file.fd);
|
|
break;
|
|
case CH_TYPE_MEMORY:
|
|
free(ch->ch_u.mem.ptr);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
TAILQ_REMOVE(&image_chunks, ch, ch_list);
|
|
free(ch);
|
|
}
|
|
if (image_swap_fd != -1)
|
|
close(image_swap_fd);
|
|
unlink(image_swap_file);
|
|
}
|
|
|
|
int
|
|
image_init(void)
|
|
{
|
|
const char *tmpdir;
|
|
|
|
TAILQ_INIT(&image_chunks);
|
|
image_nchunks = 0;
|
|
|
|
image_swap_size = 0;
|
|
image_swap_pgsz = getpagesize();
|
|
|
|
if (atexit(image_cleanup) == -1)
|
|
return (errno);
|
|
if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0')
|
|
tmpdir = _PATH_TMP;
|
|
snprintf(image_swap_file, sizeof(image_swap_file), "%s/mkimg-XXXXXX",
|
|
tmpdir);
|
|
image_swap_fd = mkstemp(image_swap_file);
|
|
if (image_swap_fd == -1)
|
|
return (errno);
|
|
return (0);
|
|
}
|