mirror of
https://git.proxmox.com/git/grub2
synced 2025-10-30 23:34:47 +00:00
40211ab884
* grub-core/commands/keystatus.c: Likewise. * grub-core/commands/loadenv.c: Likewise. * grub-core/commands/probe.c: Likewise. * grub-core/commands/regexp.c: Likewise. * grub-core/commands/true.c: Likewise. * grub-core/commands/videoinfo.c: Likewise. * grub-core/disk/cryptodisk.c: Likewise. * grub-core/disk/ldm.c: Likewise. * grub-core/disk/loopback.c: Likewise. * grub-core/disk/luks.c: Likewise. * grub-core/fs/zfs/zfsinfo.c: Likewise. * grub-core/kern/disk.c: Likewise. * grub-core/kern/emu/hostdisk.c: Likewise.
703 lines
17 KiB
C
703 lines
17 KiB
C
/*
|
||
* GRUB -- GRand Unified Bootloader
|
||
* Copyright (C) 2002,2003,2004,2006,2007,2008,2009,2010 Free Software Foundation, Inc.
|
||
*
|
||
* GRUB is free software: you can redistribute it and/or modify
|
||
* it under the terms of the GNU General Public License as published by
|
||
* the Free Software Foundation, either version 3 of the License, or
|
||
* (at your option) any later version.
|
||
*
|
||
* GRUB is distributed in the hope that it will be useful,
|
||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
* GNU General Public License for more details.
|
||
*
|
||
* You should have received a copy of the GNU General Public License
|
||
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
|
||
*/
|
||
|
||
#include <grub/disk.h>
|
||
#include <grub/err.h>
|
||
#include <grub/mm.h>
|
||
#include <grub/types.h>
|
||
#include <grub/partition.h>
|
||
#include <grub/misc.h>
|
||
#include <grub/time.h>
|
||
#include <grub/file.h>
|
||
#include <grub/i18n.h>
|
||
|
||
#define GRUB_CACHE_TIMEOUT 2
|
||
|
||
/* The last time the disk was used. */
|
||
static grub_uint64_t grub_last_time = 0;
|
||
|
||
|
||
/* Disk cache. */
|
||
struct grub_disk_cache
|
||
{
|
||
enum grub_disk_dev_id dev_id;
|
||
unsigned long disk_id;
|
||
grub_disk_addr_t sector;
|
||
char *data;
|
||
int lock;
|
||
};
|
||
|
||
static struct grub_disk_cache grub_disk_cache_table[GRUB_DISK_CACHE_NUM];
|
||
|
||
void (*grub_disk_firmware_fini) (void);
|
||
int grub_disk_firmware_is_tainted;
|
||
|
||
#if DISK_CACHE_STATS
|
||
static unsigned long grub_disk_cache_hits;
|
||
static unsigned long grub_disk_cache_misses;
|
||
|
||
void
|
||
grub_disk_cache_get_performance (unsigned long *hits, unsigned long *misses)
|
||
{
|
||
*hits = grub_disk_cache_hits;
|
||
*misses = grub_disk_cache_misses;
|
||
}
|
||
#endif
|
||
|
||
static unsigned
|
||
grub_disk_cache_get_index (unsigned long dev_id, unsigned long disk_id,
|
||
grub_disk_addr_t sector)
|
||
{
|
||
return ((dev_id * 524287UL + disk_id * 2606459UL
|
||
+ ((unsigned) (sector >> GRUB_DISK_CACHE_BITS)))
|
||
% GRUB_DISK_CACHE_NUM);
|
||
}
|
||
|
||
static void
|
||
grub_disk_cache_invalidate (unsigned long dev_id, unsigned long disk_id,
|
||
grub_disk_addr_t sector)
|
||
{
|
||
unsigned index;
|
||
struct grub_disk_cache *cache;
|
||
|
||
sector &= ~(GRUB_DISK_CACHE_SIZE - 1);
|
||
index = grub_disk_cache_get_index (dev_id, disk_id, sector);
|
||
cache = grub_disk_cache_table + index;
|
||
|
||
if (cache->dev_id == dev_id && cache->disk_id == disk_id
|
||
&& cache->sector == sector && cache->data)
|
||
{
|
||
cache->lock = 1;
|
||
grub_free (cache->data);
|
||
cache->data = 0;
|
||
cache->lock = 0;
|
||
}
|
||
}
|
||
|
||
void
|
||
grub_disk_cache_invalidate_all (void)
|
||
{
|
||
unsigned i;
|
||
|
||
for (i = 0; i < GRUB_DISK_CACHE_NUM; i++)
|
||
{
|
||
struct grub_disk_cache *cache = grub_disk_cache_table + i;
|
||
|
||
if (cache->data && ! cache->lock)
|
||
{
|
||
grub_free (cache->data);
|
||
cache->data = 0;
|
||
}
|
||
}
|
||
}
|
||
|
||
static char *
|
||
grub_disk_cache_fetch (unsigned long dev_id, unsigned long disk_id,
|
||
grub_disk_addr_t sector)
|
||
{
|
||
struct grub_disk_cache *cache;
|
||
unsigned index;
|
||
|
||
index = grub_disk_cache_get_index (dev_id, disk_id, sector);
|
||
cache = grub_disk_cache_table + index;
|
||
|
||
if (cache->dev_id == dev_id && cache->disk_id == disk_id
|
||
&& cache->sector == sector)
|
||
{
|
||
cache->lock = 1;
|
||
#if DISK_CACHE_STATS
|
||
grub_disk_cache_hits++;
|
||
#endif
|
||
return cache->data;
|
||
}
|
||
|
||
#if DISK_CACHE_STATS
|
||
grub_disk_cache_misses++;
|
||
#endif
|
||
|
||
return 0;
|
||
}
|
||
|
||
static void
|
||
grub_disk_cache_unlock (unsigned long dev_id, unsigned long disk_id,
|
||
grub_disk_addr_t sector)
|
||
{
|
||
struct grub_disk_cache *cache;
|
||
unsigned index;
|
||
|
||
index = grub_disk_cache_get_index (dev_id, disk_id, sector);
|
||
cache = grub_disk_cache_table + index;
|
||
|
||
if (cache->dev_id == dev_id && cache->disk_id == disk_id
|
||
&& cache->sector == sector)
|
||
cache->lock = 0;
|
||
}
|
||
|
||
static grub_err_t
|
||
grub_disk_cache_store (unsigned long dev_id, unsigned long disk_id,
|
||
grub_disk_addr_t sector, const char *data)
|
||
{
|
||
unsigned index;
|
||
struct grub_disk_cache *cache;
|
||
|
||
index = grub_disk_cache_get_index (dev_id, disk_id, sector);
|
||
cache = grub_disk_cache_table + index;
|
||
|
||
cache->lock = 1;
|
||
grub_free (cache->data);
|
||
cache->data = 0;
|
||
cache->lock = 0;
|
||
|
||
cache->data = grub_malloc (GRUB_DISK_SECTOR_SIZE << GRUB_DISK_CACHE_BITS);
|
||
if (! cache->data)
|
||
return grub_errno;
|
||
|
||
grub_memcpy (cache->data, data,
|
||
GRUB_DISK_SECTOR_SIZE << GRUB_DISK_CACHE_BITS);
|
||
cache->dev_id = dev_id;
|
||
cache->disk_id = disk_id;
|
||
cache->sector = sector;
|
||
|
||
return GRUB_ERR_NONE;
|
||
}
|
||
|
||
|
||
|
||
grub_disk_dev_t grub_disk_dev_list;
|
||
|
||
void
|
||
grub_disk_dev_register (grub_disk_dev_t dev)
|
||
{
|
||
dev->next = grub_disk_dev_list;
|
||
grub_disk_dev_list = dev;
|
||
}
|
||
|
||
void
|
||
grub_disk_dev_unregister (grub_disk_dev_t dev)
|
||
{
|
||
grub_disk_dev_t *p, q;
|
||
|
||
for (p = &grub_disk_dev_list, q = *p; q; p = &(q->next), q = q->next)
|
||
if (q == dev)
|
||
{
|
||
*p = q->next;
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Return the location of the first ',', if any, which is not
|
||
escaped by a '\'. */
|
||
static const char *
|
||
find_part_sep (const char *name)
|
||
{
|
||
const char *p = name;
|
||
char c;
|
||
|
||
while ((c = *p++) != '\0')
|
||
{
|
||
if (c == '\\' && *p == ',')
|
||
p++;
|
||
else if (c == ',')
|
||
return p - 1;
|
||
}
|
||
return NULL;
|
||
}
|
||
|
||
grub_disk_t
|
||
grub_disk_open (const char *name)
|
||
{
|
||
const char *p;
|
||
grub_disk_t disk;
|
||
grub_disk_dev_t dev;
|
||
char *raw = (char *) name;
|
||
grub_uint64_t current_time;
|
||
|
||
grub_dprintf ("disk", "Opening `%s'...\n", name);
|
||
|
||
disk = (grub_disk_t) grub_zalloc (sizeof (*disk));
|
||
if (! disk)
|
||
return 0;
|
||
disk->log_sector_size = GRUB_DISK_SECTOR_BITS;
|
||
|
||
p = find_part_sep (name);
|
||
if (p)
|
||
{
|
||
grub_size_t len = p - name;
|
||
|
||
raw = grub_malloc (len + 1);
|
||
if (! raw)
|
||
goto fail;
|
||
|
||
grub_memcpy (raw, name, len);
|
||
raw[len] = '\0';
|
||
disk->name = grub_strdup (raw);
|
||
}
|
||
else
|
||
disk->name = grub_strdup (name);
|
||
if (! disk->name)
|
||
goto fail;
|
||
|
||
for (dev = grub_disk_dev_list; dev; dev = dev->next)
|
||
{
|
||
if ((dev->open) (raw, disk) == GRUB_ERR_NONE)
|
||
break;
|
||
else if (grub_errno == GRUB_ERR_UNKNOWN_DEVICE)
|
||
grub_errno = GRUB_ERR_NONE;
|
||
else
|
||
goto fail;
|
||
}
|
||
|
||
if (! dev)
|
||
{
|
||
grub_error (GRUB_ERR_UNKNOWN_DEVICE, N_("disk `%s' not found"),
|
||
name);
|
||
goto fail;
|
||
}
|
||
if (disk->log_sector_size > GRUB_DISK_CACHE_BITS + GRUB_DISK_SECTOR_BITS
|
||
|| disk->log_sector_size < GRUB_DISK_SECTOR_BITS)
|
||
{
|
||
grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
|
||
"sector sizes of %d bytes aren't supported yet",
|
||
(1 << disk->log_sector_size));
|
||
goto fail;
|
||
}
|
||
|
||
disk->dev = dev;
|
||
|
||
if (p)
|
||
{
|
||
disk->partition = grub_partition_probe (disk, p + 1);
|
||
if (! disk->partition)
|
||
{
|
||
/* TRANSLATORS: It means that the specified partition e.g.
|
||
hd0,msdos1=/dev/sda1 doesn't exist. */
|
||
grub_error (GRUB_ERR_UNKNOWN_DEVICE, N_("no such partition"));
|
||
goto fail;
|
||
}
|
||
}
|
||
|
||
/* The cache will be invalidated about 2 seconds after a device was
|
||
closed. */
|
||
current_time = grub_get_time_ms ();
|
||
|
||
if (current_time > (grub_last_time
|
||
+ GRUB_CACHE_TIMEOUT * 1000))
|
||
grub_disk_cache_invalidate_all ();
|
||
|
||
grub_last_time = current_time;
|
||
|
||
fail:
|
||
|
||
if (raw && raw != name)
|
||
grub_free (raw);
|
||
|
||
if (grub_errno != GRUB_ERR_NONE)
|
||
{
|
||
grub_error_push ();
|
||
grub_dprintf ("disk", "Opening `%s' failed.\n", name);
|
||
grub_error_pop ();
|
||
|
||
grub_disk_close (disk);
|
||
return 0;
|
||
}
|
||
|
||
return disk;
|
||
}
|
||
|
||
void
|
||
grub_disk_close (grub_disk_t disk)
|
||
{
|
||
grub_partition_t part;
|
||
grub_dprintf ("disk", "Closing `%s'.\n", disk->name);
|
||
|
||
if (disk->dev && disk->dev->close)
|
||
(disk->dev->close) (disk);
|
||
|
||
/* Reset the timer. */
|
||
grub_last_time = grub_get_time_ms ();
|
||
|
||
while (disk->partition)
|
||
{
|
||
part = disk->partition->parent;
|
||
grub_free (disk->partition);
|
||
disk->partition = part;
|
||
}
|
||
grub_free ((void *) disk->name);
|
||
grub_free (disk);
|
||
}
|
||
|
||
/* This function performs three tasks:
|
||
- Make sectors disk relative from partition relative.
|
||
- Normalize offset to be less than the sector size.
|
||
- Verify that the range is inside the partition. */
|
||
static grub_err_t
|
||
grub_disk_adjust_range (grub_disk_t disk, grub_disk_addr_t *sector,
|
||
grub_off_t *offset, grub_size_t size)
|
||
{
|
||
grub_partition_t part;
|
||
*sector += *offset >> GRUB_DISK_SECTOR_BITS;
|
||
*offset &= GRUB_DISK_SECTOR_SIZE - 1;
|
||
|
||
for (part = disk->partition; part; part = part->parent)
|
||
{
|
||
grub_disk_addr_t start;
|
||
grub_uint64_t len;
|
||
|
||
start = part->start;
|
||
len = part->len;
|
||
|
||
if (*sector >= len
|
||
|| len - *sector < ((*offset + size + GRUB_DISK_SECTOR_SIZE - 1)
|
||
>> GRUB_DISK_SECTOR_BITS))
|
||
return grub_error (GRUB_ERR_OUT_OF_RANGE,
|
||
N_("attempt to read or write outside of partition"));
|
||
|
||
*sector += start;
|
||
}
|
||
|
||
if (disk->total_sectors != GRUB_DISK_SIZE_UNKNOWN
|
||
&& ((disk->total_sectors << (disk->log_sector_size - GRUB_DISK_SECTOR_BITS)) <= *sector
|
||
|| ((*offset + size + GRUB_DISK_SECTOR_SIZE - 1)
|
||
>> GRUB_DISK_SECTOR_BITS) > (disk->total_sectors
|
||
<< (disk->log_sector_size
|
||
- GRUB_DISK_SECTOR_BITS)) - *sector))
|
||
return grub_error (GRUB_ERR_OUT_OF_RANGE,
|
||
N_("attempt to read or write outside of disk `%s'"), disk->name);
|
||
|
||
return GRUB_ERR_NONE;
|
||
}
|
||
|
||
static inline grub_disk_addr_t
|
||
transform_sector (grub_disk_t disk, grub_disk_addr_t sector)
|
||
{
|
||
return sector >> (disk->log_sector_size - GRUB_DISK_SECTOR_BITS);
|
||
}
|
||
|
||
/* Small read (less than cache size and not pass across cache unit boundaries).
|
||
sector is already adjusted and is divisible by cache unit size.
|
||
*/
|
||
static grub_err_t
|
||
grub_disk_read_small (grub_disk_t disk, grub_disk_addr_t sector,
|
||
grub_off_t offset, grub_size_t size, void *buf)
|
||
{
|
||
char *data;
|
||
char *tmp_buf;
|
||
|
||
/* Fetch the cache. */
|
||
data = grub_disk_cache_fetch (disk->dev->id, disk->id, sector);
|
||
if (data)
|
||
{
|
||
/* Just copy it! */
|
||
grub_memcpy (buf, data + offset, size);
|
||
grub_disk_cache_unlock (disk->dev->id, disk->id, sector);
|
||
return GRUB_ERR_NONE;
|
||
}
|
||
|
||
/* Allocate a temporary buffer. */
|
||
tmp_buf = grub_malloc (GRUB_DISK_SECTOR_SIZE << GRUB_DISK_CACHE_BITS);
|
||
if (! tmp_buf)
|
||
return grub_errno;
|
||
|
||
/* Otherwise read data from the disk actually. */
|
||
if (disk->total_sectors == GRUB_DISK_SIZE_UNKNOWN
|
||
|| sector + GRUB_DISK_CACHE_SIZE
|
||
< (disk->total_sectors << (disk->log_sector_size - GRUB_DISK_SECTOR_BITS)))
|
||
{
|
||
grub_err_t err;
|
||
err = (disk->dev->read) (disk, transform_sector (disk, sector),
|
||
1 << (GRUB_DISK_CACHE_BITS
|
||
+ GRUB_DISK_SECTOR_BITS
|
||
- disk->log_sector_size), tmp_buf);
|
||
if (!err)
|
||
{
|
||
/* Copy it and store it in the disk cache. */
|
||
grub_memcpy (buf, tmp_buf + offset, size);
|
||
grub_disk_cache_store (disk->dev->id, disk->id,
|
||
sector, tmp_buf);
|
||
grub_free (tmp_buf);
|
||
return GRUB_ERR_NONE;
|
||
}
|
||
}
|
||
|
||
grub_free (tmp_buf);
|
||
grub_errno = GRUB_ERR_NONE;
|
||
|
||
{
|
||
/* Uggh... Failed. Instead, just read necessary data. */
|
||
unsigned num;
|
||
grub_disk_addr_t aligned_sector;
|
||
|
||
sector += (offset >> GRUB_DISK_SECTOR_BITS);
|
||
offset &= ((1 << GRUB_DISK_SECTOR_BITS) - 1);
|
||
aligned_sector = (sector & ~((1 << (disk->log_sector_size
|
||
- GRUB_DISK_SECTOR_BITS))
|
||
- 1));
|
||
offset += ((sector - aligned_sector) << GRUB_DISK_SECTOR_BITS);
|
||
num = ((size + offset + (1 << (disk->log_sector_size))
|
||
- 1) >> (disk->log_sector_size));
|
||
|
||
tmp_buf = grub_malloc (num << disk->log_sector_size);
|
||
if (!tmp_buf)
|
||
return grub_errno;
|
||
|
||
if ((disk->dev->read) (disk, transform_sector (disk, aligned_sector),
|
||
num, tmp_buf))
|
||
{
|
||
grub_error_push ();
|
||
grub_dprintf ("disk", "%s read failed\n", disk->name);
|
||
grub_error_pop ();
|
||
grub_free (tmp_buf);
|
||
return grub_errno;
|
||
}
|
||
grub_memcpy (buf, tmp_buf + offset, size);
|
||
grub_free (tmp_buf);
|
||
return GRUB_ERR_NONE;
|
||
}
|
||
}
|
||
|
||
/* Read data from the disk. */
|
||
grub_err_t
|
||
grub_disk_read (grub_disk_t disk, grub_disk_addr_t sector,
|
||
grub_off_t offset, grub_size_t size, void *buf)
|
||
{
|
||
grub_off_t real_offset;
|
||
grub_disk_addr_t real_sector;
|
||
grub_size_t real_size;
|
||
|
||
/* First of all, check if the region is within the disk. */
|
||
if (grub_disk_adjust_range (disk, §or, &offset, size) != GRUB_ERR_NONE)
|
||
{
|
||
grub_error_push ();
|
||
grub_dprintf ("disk", "Read out of range: sector 0x%llx (%s).\n",
|
||
(unsigned long long) sector, grub_errmsg);
|
||
grub_error_pop ();
|
||
return grub_errno;
|
||
}
|
||
|
||
real_sector = sector;
|
||
real_offset = offset;
|
||
real_size = size;
|
||
|
||
/* First read until first cache boundary. */
|
||
if (offset || (sector & (GRUB_DISK_CACHE_SIZE - 1)))
|
||
{
|
||
grub_disk_addr_t start_sector;
|
||
grub_size_t pos;
|
||
grub_err_t err;
|
||
grub_size_t len;
|
||
|
||
start_sector = sector & ~(GRUB_DISK_CACHE_SIZE - 1);
|
||
pos = (sector - start_sector) << GRUB_DISK_SECTOR_BITS;
|
||
len = ((GRUB_DISK_SECTOR_SIZE << GRUB_DISK_CACHE_BITS)
|
||
- pos - offset);
|
||
if (len > size)
|
||
len = size;
|
||
err = grub_disk_read_small (disk, start_sector,
|
||
offset + pos, len, buf);
|
||
if (err)
|
||
return err;
|
||
buf = (char *) buf + len;
|
||
size -= len;
|
||
offset += len;
|
||
sector += (offset >> GRUB_DISK_SECTOR_BITS);
|
||
offset &= ((1 << GRUB_DISK_SECTOR_BITS) - 1);
|
||
}
|
||
|
||
/* Until SIZE is zero... */
|
||
while (size >= (GRUB_DISK_CACHE_SIZE << GRUB_DISK_SECTOR_BITS))
|
||
{
|
||
char *data = NULL;
|
||
grub_disk_addr_t agglomerate;
|
||
grub_err_t err;
|
||
|
||
/* agglomerate read until we find a first cached entry. */
|
||
for (agglomerate = 0; agglomerate
|
||
< (size >> (GRUB_DISK_SECTOR_BITS + GRUB_DISK_CACHE_BITS));
|
||
agglomerate++)
|
||
{
|
||
data = grub_disk_cache_fetch (disk->dev->id, disk->id,
|
||
sector + (agglomerate
|
||
<< GRUB_DISK_CACHE_BITS));
|
||
if (data)
|
||
break;
|
||
}
|
||
|
||
if (data)
|
||
{
|
||
grub_memcpy ((char *) buf
|
||
+ (agglomerate << (GRUB_DISK_CACHE_BITS
|
||
+ GRUB_DISK_SECTOR_BITS)),
|
||
data, GRUB_DISK_CACHE_SIZE << GRUB_DISK_SECTOR_BITS);
|
||
grub_disk_cache_unlock (disk->dev->id, disk->id,
|
||
sector + (agglomerate
|
||
<< GRUB_DISK_CACHE_BITS));
|
||
}
|
||
|
||
if (agglomerate)
|
||
{
|
||
grub_disk_addr_t i;
|
||
|
||
err = (disk->dev->read) (disk, transform_sector (disk, sector),
|
||
agglomerate << (GRUB_DISK_CACHE_BITS
|
||
+ GRUB_DISK_SECTOR_BITS
|
||
- disk->log_sector_size),
|
||
buf);
|
||
if (err)
|
||
return err;
|
||
|
||
for (i = 0; i < agglomerate; i ++)
|
||
grub_disk_cache_store (disk->dev->id, disk->id,
|
||
sector + (i << GRUB_DISK_CACHE_BITS),
|
||
(char *) buf
|
||
+ (i << (GRUB_DISK_CACHE_BITS
|
||
+ GRUB_DISK_SECTOR_BITS)));
|
||
|
||
sector += agglomerate << GRUB_DISK_CACHE_BITS;
|
||
size -= agglomerate << (GRUB_DISK_CACHE_BITS + GRUB_DISK_SECTOR_BITS);
|
||
buf = (char *) buf
|
||
+ (agglomerate << (GRUB_DISK_CACHE_BITS + GRUB_DISK_SECTOR_BITS));
|
||
}
|
||
|
||
if (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;
|
||
}
|
||
|
||
/* Call the read hook, if any. */
|
||
if (disk->read_hook)
|
||
{
|
||
grub_disk_addr_t s = real_sector;
|
||
grub_size_t l = real_size;
|
||
grub_off_t o = real_offset;
|
||
|
||
while (l)
|
||
{
|
||
grub_size_t cl;
|
||
cl = GRUB_DISK_SECTOR_SIZE - o;
|
||
if (cl > l)
|
||
cl = l;
|
||
(disk->read_hook) (s, o, cl);
|
||
s++;
|
||
l -= cl;
|
||
o = 0;
|
||
}
|
||
}
|
||
|
||
return grub_errno;
|
||
}
|
||
|
||
grub_err_t
|
||
grub_disk_write (grub_disk_t disk, grub_disk_addr_t sector,
|
||
grub_off_t offset, grub_size_t size, const void *buf)
|
||
{
|
||
unsigned real_offset;
|
||
grub_disk_addr_t aligned_sector;
|
||
|
||
grub_dprintf ("disk", "Writing `%s'...\n", disk->name);
|
||
|
||
if (grub_disk_adjust_range (disk, §or, &offset, size) != GRUB_ERR_NONE)
|
||
return -1;
|
||
|
||
aligned_sector = (sector & ~((1 << (disk->log_sector_size
|
||
- GRUB_DISK_SECTOR_BITS)) - 1));
|
||
real_offset = offset + ((sector - aligned_sector) << GRUB_DISK_SECTOR_BITS);
|
||
sector = aligned_sector;
|
||
|
||
while (size)
|
||
{
|
||
if (real_offset != 0 || (size < (1U << disk->log_sector_size)
|
||
&& size != 0))
|
||
{
|
||
char tmp_buf[1 << disk->log_sector_size];
|
||
grub_size_t len;
|
||
grub_partition_t part;
|
||
|
||
part = disk->partition;
|
||
disk->partition = 0;
|
||
if (grub_disk_read (disk, sector,
|
||
0, (1 << disk->log_sector_size), tmp_buf)
|
||
!= GRUB_ERR_NONE)
|
||
{
|
||
disk->partition = part;
|
||
goto finish;
|
||
}
|
||
disk->partition = part;
|
||
|
||
len = (1 << disk->log_sector_size) - real_offset;
|
||
if (len > size)
|
||
len = size;
|
||
|
||
grub_memcpy (tmp_buf + real_offset, buf, len);
|
||
|
||
grub_disk_cache_invalidate (disk->dev->id, disk->id, sector);
|
||
|
||
if ((disk->dev->write) (disk, sector, 1, tmp_buf) != GRUB_ERR_NONE)
|
||
goto finish;
|
||
|
||
sector += (1 << (disk->log_sector_size - GRUB_DISK_SECTOR_BITS));
|
||
buf = (const char *) buf + len;
|
||
size -= len;
|
||
real_offset = 0;
|
||
}
|
||
else
|
||
{
|
||
grub_size_t len;
|
||
grub_size_t n;
|
||
|
||
len = size & ~((1 << disk->log_sector_size) - 1);
|
||
n = size >> disk->log_sector_size;
|
||
|
||
if ((disk->dev->write) (disk, sector, n, buf) != GRUB_ERR_NONE)
|
||
goto finish;
|
||
|
||
while (n--)
|
||
grub_disk_cache_invalidate (disk->dev->id, disk->id, sector++);
|
||
|
||
buf = (const char *) buf + len;
|
||
size -= len;
|
||
}
|
||
}
|
||
|
||
finish:
|
||
|
||
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;
|
||
}
|