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Use shifts in minix filesystem.

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* grub-core/fs/minix.c (GRUB_MINIX_ZONESZ): Use log_block_size.
	(GRUB_MINIX_ZONE2SECT): Likewise.
	(grub_minix_data): Replace block_size with log_block_size.
	(grub_minix_read_file): Use shifts.
	(grub_minix_mount): Check block size and take a logarithm.
This commit is contained in:
Vladimir 'phcoder' Serbinenko 2011-10-28 16:09:20 +02:00
parent ed9ba06dd0
commit 564dd58c2a
2 changed files with 29 additions and 13 deletions
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10
ChangeLog
View file

@ -1,3 +1,13 @@
2011-10-28 Vladimir Serbinenko <phcoder@gmail.com>
Use shifts in minix filesystem.
* grub-core/fs/minix.c (GRUB_MINIX_ZONESZ): Use log_block_size.
(GRUB_MINIX_ZONE2SECT): Likewise.
(grub_minix_data): Replace block_size with log_block_size.
(grub_minix_read_file): Use shifts.
(grub_minix_mount): Check block size and take a logarithm.
2011-10-28 Vladimir Serbinenko <phcoder@gmail.com>
Use shifts in squash4.

32
grub-core/fs/minix.c
View file

@ -76,11 +76,11 @@ typedef grub_uint16_t grub_minix_ino_t;
#define GRUB_MINIX_LOG2_ZONESZ (GRUB_MINIX_LOG2_BSIZE \
+ grub_le_to_cpu16 (data->sblock.log2_zone_size))
#endif
#define GRUB_MINIX_ZONESZ (data->block_size \
<< grub_le_to_cpu16 (data->sblock.log2_zone_size))
#define GRUB_MINIX_ZONESZ (1 << (data->log_block_size \
+ grub_le_to_cpu16 (data->sblock.log2_zone_size)))
#ifdef MODE_MINIX3
#define GRUB_MINIX_ZONE2SECT(zone) ((zone) * (data->block_size / GRUB_DISK_SECTOR_SIZE))
#define GRUB_MINIX_ZONE2SECT(zone) ((zone) << (data->log_block_size - GRUB_DISK_SECTOR_BITS))
#else
#define GRUB_MINIX_ZONE2SECT(zone) ((zone) << GRUB_MINIX_LOG2_ZONESZ)
#endif
@ -159,7 +159,7 @@ struct grub_minix_data
int linknest;
grub_disk_t disk;
int filename_size;
grub_size_t block_size;
grub_size_t log_block_size;
};
static grub_dl_t my_mod;
@ -251,14 +251,15 @@ grub_minix_read_file (struct grub_minix_data *data,
if (len + pos > GRUB_MINIX_INODE_SIZE (data))
len = GRUB_MINIX_INODE_SIZE (data) - pos;
blockcnt = grub_divmod64 ((len + pos + data->block_size - 1),
data->block_size, 0);
posblock = grub_divmod64 (pos, data->block_size, &blockoff);
blockcnt = ((len + pos + (1 << data->log_block_size) - 1)
>> data->log_block_size);
posblock = pos >> data->log_block_size;
blockoff = pos & ((1 << data->log_block_size) - 1);
for (i = posblock; i < blockcnt; i++)
{
grub_disk_addr_t blknr;
grub_uint64_t blockend = data->block_size;
grub_uint64_t blockend = 1 << data->log_block_size;
grub_off_t skipfirst = 0;
blknr = grub_minix_get_file_block (data, i);
@ -268,10 +269,10 @@ grub_minix_read_file (struct grub_minix_data *data,
/* Last block. */
if (i == blockcnt - 1)
{
grub_divmod64 (len + pos, data->block_size, &blockend);
blockend = (len + pos) & ((1 << data->log_block_size) - 1);
if (!blockend)
blockend = data->block_size;
blockend = 1 << data->log_block_size;
}
/* First block. */
@ -289,7 +290,7 @@ grub_minix_read_file (struct grub_minix_data *data,
if (grub_errno)
return -1;
buf += data->block_size - skipfirst;
buf += (1 << data->log_block_size) - skipfirst;
}
return len;
@ -479,9 +480,14 @@ grub_minix_mount (grub_disk_t disk)
data->disk = disk;
data->linknest = 0;
#ifdef MODE_MINIX3
data->block_size = grub_le_to_cpu16 (data->sblock.block_size);
if ((grub_le_to_cpu16 (data->sblock.block_size)
& (grub_le_to_cpu16 (data->sblock.block_size) - 1))
|| grub_le_to_cpu16 (data->sblock.block_size) == 0)
goto fail;
for (data->log_block_size = 0; (1 << data->log_block_size)
< grub_le_to_cpu16 (data->sblock.block_size); data->log_block_size++);
#else
data->block_size = 1024U;
data->log_block_size = 10;
#endif
return data;