mirror of
https://git.proxmox.com/git/grub2
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545 lines
14 KiB
C
545 lines
14 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2003,2004,2006,2007,2008,2009,2010 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/disk.h>
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#include <grub/err.h>
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#include <grub/mm.h>
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#include <grub/types.h>
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#include <grub/partition.h>
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#include <grub/misc.h>
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#include <grub/time.h>
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#include <grub/file.h>
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#include <grub/i18n.h>
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#define GRUB_CACHE_TIMEOUT 2
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/* The last time the disk was used. */
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static grub_uint64_t grub_last_time = 0;
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struct grub_disk_cache grub_disk_cache_table[GRUB_DISK_CACHE_NUM];
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void (*grub_disk_firmware_fini) (void);
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int grub_disk_firmware_is_tainted;
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#if DISK_CACHE_STATS
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static unsigned long grub_disk_cache_hits;
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static unsigned long grub_disk_cache_misses;
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void
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grub_disk_cache_get_performance (unsigned long *hits, unsigned long *misses)
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{
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*hits = grub_disk_cache_hits;
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*misses = grub_disk_cache_misses;
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}
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#endif
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grub_err_t (*grub_disk_write_weak) (grub_disk_t disk,
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grub_disk_addr_t sector,
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grub_off_t offset,
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grub_size_t size,
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const void *buf);
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#include "disk_common.c"
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void
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grub_disk_cache_invalidate_all (void)
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{
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unsigned i;
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for (i = 0; i < GRUB_DISK_CACHE_NUM; i++)
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{
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struct grub_disk_cache *cache = grub_disk_cache_table + i;
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if (cache->data && ! cache->lock)
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{
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grub_free (cache->data);
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cache->data = 0;
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}
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}
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}
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static char *
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grub_disk_cache_fetch (unsigned long dev_id, unsigned long disk_id,
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grub_disk_addr_t sector)
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{
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struct grub_disk_cache *cache;
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unsigned cache_index;
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cache_index = grub_disk_cache_get_index (dev_id, disk_id, sector);
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cache = grub_disk_cache_table + cache_index;
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if (cache->dev_id == dev_id && cache->disk_id == disk_id
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&& cache->sector == sector)
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{
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cache->lock = 1;
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#if DISK_CACHE_STATS
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grub_disk_cache_hits++;
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#endif
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return cache->data;
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}
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#if DISK_CACHE_STATS
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grub_disk_cache_misses++;
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#endif
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return 0;
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}
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static void
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grub_disk_cache_unlock (unsigned long dev_id, unsigned long disk_id,
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grub_disk_addr_t sector)
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{
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struct grub_disk_cache *cache;
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unsigned cache_index;
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cache_index = grub_disk_cache_get_index (dev_id, disk_id, sector);
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cache = grub_disk_cache_table + cache_index;
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if (cache->dev_id == dev_id && cache->disk_id == disk_id
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&& cache->sector == sector)
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cache->lock = 0;
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}
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static grub_err_t
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grub_disk_cache_store (unsigned long dev_id, unsigned long disk_id,
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grub_disk_addr_t sector, const char *data)
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{
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unsigned cache_index;
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struct grub_disk_cache *cache;
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cache_index = grub_disk_cache_get_index (dev_id, disk_id, sector);
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cache = grub_disk_cache_table + cache_index;
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cache->lock = 1;
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grub_free (cache->data);
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cache->data = 0;
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cache->lock = 0;
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cache->data = grub_malloc (GRUB_DISK_SECTOR_SIZE << GRUB_DISK_CACHE_BITS);
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if (! cache->data)
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return grub_errno;
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grub_memcpy (cache->data, data,
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GRUB_DISK_SECTOR_SIZE << GRUB_DISK_CACHE_BITS);
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cache->dev_id = dev_id;
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cache->disk_id = disk_id;
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cache->sector = sector;
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return GRUB_ERR_NONE;
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}
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grub_disk_dev_t grub_disk_dev_list;
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void
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grub_disk_dev_register (grub_disk_dev_t dev)
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{
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dev->next = grub_disk_dev_list;
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grub_disk_dev_list = dev;
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}
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void
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grub_disk_dev_unregister (grub_disk_dev_t dev)
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{
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grub_disk_dev_t *p, q;
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for (p = &grub_disk_dev_list, q = *p; q; p = &(q->next), q = q->next)
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if (q == dev)
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{
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*p = q->next;
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break;
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}
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}
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/* Return the location of the first ',', if any, which is not
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escaped by a '\'. */
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static const char *
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find_part_sep (const char *name)
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{
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const char *p = name;
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char c;
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while ((c = *p++) != '\0')
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{
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if (c == '\\' && *p == ',')
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p++;
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else if (c == ',')
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return p - 1;
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}
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return NULL;
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}
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grub_disk_t
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grub_disk_open (const char *name)
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{
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const char *p;
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grub_disk_t disk;
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grub_disk_dev_t dev;
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char *raw = (char *) name;
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grub_uint64_t current_time;
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grub_dprintf ("disk", "Opening `%s'...\n", name);
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disk = (grub_disk_t) grub_zalloc (sizeof (*disk));
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if (! disk)
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return 0;
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disk->log_sector_size = GRUB_DISK_SECTOR_BITS;
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/* Default 1MiB of maximum agglomerate. */
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disk->max_agglomerate = 1048576 >> (GRUB_DISK_SECTOR_BITS
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+ GRUB_DISK_CACHE_BITS);
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p = find_part_sep (name);
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if (p)
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{
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grub_size_t len = p - name;
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raw = grub_malloc (len + 1);
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if (! raw)
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goto fail;
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grub_memcpy (raw, name, len);
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raw[len] = '\0';
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disk->name = grub_strdup (raw);
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}
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else
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disk->name = grub_strdup (name);
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if (! disk->name)
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goto fail;
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for (dev = grub_disk_dev_list; dev; dev = dev->next)
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{
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if ((dev->open) (raw, disk) == GRUB_ERR_NONE)
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break;
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else if (grub_errno == GRUB_ERR_UNKNOWN_DEVICE)
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grub_errno = GRUB_ERR_NONE;
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else
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goto fail;
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}
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if (! dev)
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{
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grub_error (GRUB_ERR_UNKNOWN_DEVICE, N_("disk `%s' not found"),
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name);
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goto fail;
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}
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if (disk->log_sector_size > GRUB_DISK_CACHE_BITS + GRUB_DISK_SECTOR_BITS
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|| disk->log_sector_size < GRUB_DISK_SECTOR_BITS)
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{
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grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
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"sector sizes of %d bytes aren't supported yet",
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(1 << disk->log_sector_size));
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goto fail;
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}
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disk->dev = dev;
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if (p)
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{
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disk->partition = grub_partition_probe (disk, p + 1);
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if (! disk->partition)
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{
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/* TRANSLATORS: It means that the specified partition e.g.
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hd0,msdos1=/dev/sda1 doesn't exist. */
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grub_error (GRUB_ERR_UNKNOWN_DEVICE, N_("no such partition"));
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goto fail;
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}
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}
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/* The cache will be invalidated about 2 seconds after a device was
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closed. */
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current_time = grub_get_time_ms ();
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if (current_time > (grub_last_time
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+ GRUB_CACHE_TIMEOUT * 1000))
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grub_disk_cache_invalidate_all ();
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grub_last_time = current_time;
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fail:
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if (raw && raw != name)
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grub_free (raw);
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if (grub_errno != GRUB_ERR_NONE)
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{
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grub_error_push ();
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grub_dprintf ("disk", "Opening `%s' failed.\n", name);
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grub_error_pop ();
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grub_disk_close (disk);
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return 0;
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}
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return disk;
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}
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void
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grub_disk_close (grub_disk_t disk)
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{
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grub_partition_t part;
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grub_dprintf ("disk", "Closing `%s'.\n", disk->name);
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if (disk->dev && disk->dev->close)
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(disk->dev->close) (disk);
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/* Reset the timer. */
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grub_last_time = grub_get_time_ms ();
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while (disk->partition)
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{
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part = disk->partition->parent;
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grub_free (disk->partition);
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disk->partition = part;
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}
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grub_free ((void *) disk->name);
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grub_free (disk);
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}
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/* Small read (less than cache size and not pass across cache unit boundaries).
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sector is already adjusted and is divisible by cache unit size.
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*/
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static grub_err_t
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grub_disk_read_small_real (grub_disk_t disk, grub_disk_addr_t sector,
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grub_off_t offset, grub_size_t size, void *buf)
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{
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char *data;
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char *tmp_buf;
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/* Fetch the cache. */
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data = grub_disk_cache_fetch (disk->dev->id, disk->id, sector);
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if (data)
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{
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/* Just copy it! */
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grub_memcpy (buf, data + offset, size);
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grub_disk_cache_unlock (disk->dev->id, disk->id, sector);
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return GRUB_ERR_NONE;
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}
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/* Allocate a temporary buffer. */
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tmp_buf = grub_malloc (GRUB_DISK_SECTOR_SIZE << GRUB_DISK_CACHE_BITS);
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if (! tmp_buf)
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return grub_errno;
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/* Otherwise read data from the disk actually. */
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if (disk->total_sectors == GRUB_DISK_SIZE_UNKNOWN
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|| sector + GRUB_DISK_CACHE_SIZE
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< (disk->total_sectors << (disk->log_sector_size - GRUB_DISK_SECTOR_BITS)))
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{
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grub_err_t err;
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err = (disk->dev->read) (disk, transform_sector (disk, sector),
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1U << (GRUB_DISK_CACHE_BITS
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+ GRUB_DISK_SECTOR_BITS
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- disk->log_sector_size), tmp_buf);
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if (!err)
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{
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/* Copy it and store it in the disk cache. */
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grub_memcpy (buf, tmp_buf + offset, size);
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grub_disk_cache_store (disk->dev->id, disk->id,
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sector, tmp_buf);
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grub_free (tmp_buf);
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return GRUB_ERR_NONE;
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}
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}
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grub_free (tmp_buf);
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grub_errno = GRUB_ERR_NONE;
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{
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/* Uggh... Failed. Instead, just read necessary data. */
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unsigned num;
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grub_disk_addr_t aligned_sector;
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sector += (offset >> GRUB_DISK_SECTOR_BITS);
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offset &= ((1 << GRUB_DISK_SECTOR_BITS) - 1);
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aligned_sector = (sector & ~((1ULL << (disk->log_sector_size
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- GRUB_DISK_SECTOR_BITS))
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- 1));
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offset += ((sector - aligned_sector) << GRUB_DISK_SECTOR_BITS);
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num = ((size + offset + (1ULL << (disk->log_sector_size))
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- 1) >> (disk->log_sector_size));
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tmp_buf = grub_malloc (num << disk->log_sector_size);
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if (!tmp_buf)
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return grub_errno;
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if ((disk->dev->read) (disk, transform_sector (disk, aligned_sector),
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num, tmp_buf))
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{
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grub_error_push ();
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grub_dprintf ("disk", "%s read failed\n", disk->name);
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grub_error_pop ();
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grub_free (tmp_buf);
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return grub_errno;
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}
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grub_memcpy (buf, tmp_buf + offset, size);
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grub_free (tmp_buf);
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return GRUB_ERR_NONE;
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}
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}
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static grub_err_t
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grub_disk_read_small (grub_disk_t disk, grub_disk_addr_t sector,
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grub_off_t offset, grub_size_t size, void *buf)
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{
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grub_err_t err;
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err = grub_disk_read_small_real (disk, sector, offset, size, buf);
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if (err)
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return err;
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if (disk->read_hook)
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(disk->read_hook) (sector + (offset >> GRUB_DISK_SECTOR_BITS),
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offset & (GRUB_DISK_SECTOR_SIZE - 1),
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size, disk->read_hook_data);
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return GRUB_ERR_NONE;
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}
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/* Read data from the disk. */
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grub_err_t
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grub_disk_read (grub_disk_t disk, grub_disk_addr_t sector,
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grub_off_t offset, grub_size_t size, void *buf)
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{
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/* First of all, check if the region is within the disk. */
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if (grub_disk_adjust_range (disk, §or, &offset, size) != GRUB_ERR_NONE)
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{
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grub_error_push ();
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grub_dprintf ("disk", "Read out of range: sector 0x%llx (%s).\n",
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(unsigned long long) sector, grub_errmsg);
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grub_error_pop ();
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return grub_errno;
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}
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/* First read until first cache boundary. */
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if (offset || (sector & (GRUB_DISK_CACHE_SIZE - 1)))
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{
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grub_disk_addr_t start_sector;
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grub_size_t pos;
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grub_err_t err;
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grub_size_t len;
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start_sector = sector & ~((grub_disk_addr_t) GRUB_DISK_CACHE_SIZE - 1);
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pos = (sector - start_sector) << GRUB_DISK_SECTOR_BITS;
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len = ((GRUB_DISK_SECTOR_SIZE << GRUB_DISK_CACHE_BITS)
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- pos - offset);
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if (len > size)
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len = size;
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err = grub_disk_read_small (disk, start_sector,
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offset + pos, len, buf);
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if (err)
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return err;
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buf = (char *) buf + len;
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size -= len;
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offset += len;
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sector += (offset >> GRUB_DISK_SECTOR_BITS);
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offset &= ((1 << GRUB_DISK_SECTOR_BITS) - 1);
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}
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/* Until SIZE is zero... */
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while (size >= (GRUB_DISK_CACHE_SIZE << GRUB_DISK_SECTOR_BITS))
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{
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char *data = NULL;
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grub_disk_addr_t agglomerate;
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grub_err_t err;
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/* agglomerate read until we find a first cached entry. */
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for (agglomerate = 0; agglomerate
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< (size >> (GRUB_DISK_SECTOR_BITS + GRUB_DISK_CACHE_BITS))
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&& agglomerate < disk->max_agglomerate;
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agglomerate++)
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{
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data = grub_disk_cache_fetch (disk->dev->id, disk->id,
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sector + (agglomerate
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<< GRUB_DISK_CACHE_BITS));
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if (data)
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break;
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}
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if (data)
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{
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grub_memcpy ((char *) buf
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+ (agglomerate << (GRUB_DISK_CACHE_BITS
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+ GRUB_DISK_SECTOR_BITS)),
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data, GRUB_DISK_CACHE_SIZE << GRUB_DISK_SECTOR_BITS);
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grub_disk_cache_unlock (disk->dev->id, disk->id,
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sector + (agglomerate
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<< GRUB_DISK_CACHE_BITS));
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}
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if (agglomerate)
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{
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grub_disk_addr_t i;
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err = (disk->dev->read) (disk, transform_sector (disk, sector),
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agglomerate << (GRUB_DISK_CACHE_BITS
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+ GRUB_DISK_SECTOR_BITS
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- disk->log_sector_size),
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buf);
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if (err)
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return err;
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for (i = 0; i < agglomerate; i ++)
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grub_disk_cache_store (disk->dev->id, disk->id,
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sector + (i << GRUB_DISK_CACHE_BITS),
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(char *) buf
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+ (i << (GRUB_DISK_CACHE_BITS
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+ GRUB_DISK_SECTOR_BITS)));
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if (disk->read_hook)
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(disk->read_hook) (sector, 0, agglomerate << (GRUB_DISK_CACHE_BITS + GRUB_DISK_SECTOR_BITS),
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disk->read_hook_data);
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sector += agglomerate << GRUB_DISK_CACHE_BITS;
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size -= agglomerate << (GRUB_DISK_CACHE_BITS + GRUB_DISK_SECTOR_BITS);
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buf = (char *) buf
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+ (agglomerate << (GRUB_DISK_CACHE_BITS + GRUB_DISK_SECTOR_BITS));
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}
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if (data)
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{
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if (disk->read_hook)
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(disk->read_hook) (sector, 0, (GRUB_DISK_CACHE_SIZE << GRUB_DISK_SECTOR_BITS),
|
||
disk->read_hook_data);
|
||
sector += GRUB_DISK_CACHE_SIZE;
|
||
buf = (char *) buf + (GRUB_DISK_CACHE_SIZE << GRUB_DISK_SECTOR_BITS);
|
||
size -= (GRUB_DISK_CACHE_SIZE << GRUB_DISK_SECTOR_BITS);
|
||
}
|
||
}
|
||
|
||
/* And now read the last part. */
|
||
if (size)
|
||
{
|
||
grub_err_t err;
|
||
err = grub_disk_read_small (disk, sector, 0, size, buf);
|
||
if (err)
|
||
return err;
|
||
}
|
||
|
||
return grub_errno;
|
||
}
|
||
|
||
grub_uint64_t
|
||
grub_disk_get_size (grub_disk_t disk)
|
||
{
|
||
if (disk->partition)
|
||
return grub_partition_get_len (disk->partition);
|
||
else if (disk->total_sectors != GRUB_DISK_SIZE_UNKNOWN)
|
||
return disk->total_sectors << (disk->log_sector_size - GRUB_DISK_SECTOR_BITS);
|
||
else
|
||
return GRUB_DISK_SIZE_UNKNOWN;
|
||
}
|