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2008-06-12 Pavel Roskin <proski@gnu.org>

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* fs/fshelp.c (grub_fshelp_read): New function.  Implement
	linear disk read with journal translation.
	* fs/ext2.c: Use grub_fshelp_read() instead of grub_disk_read().
	* include/grub/fshelp.h: Declare grub_fshelp_read().
This commit is contained in:
proski 2008-06-12 14:48:27 +00:00
parent 40fd3a2b99
commit 16ae7781ef
4 changed files with 74 additions and 27 deletions
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7
ChangeLog
View file

@ -1,3 +1,10 @@
2008-06-12 Pavel Roskin <proski@gnu.org>
* fs/fshelp.c (grub_fshelp_read): New function. Implement
linear disk read with journal translation.
* fs/ext2.c: Use grub_fshelp_read() instead of grub_disk_read().
* include/grub/fshelp.h: Declare grub_fshelp_read().
2008-06-09 Pavel Roskin <proski@gnu.org>
* fs/minix.c (grub_minix_mount): Handle error reading

46
fs/ext2.c
View file

@ -257,12 +257,11 @@ inline static grub_err_t
grub_ext2_blockgroup (struct grub_ext2_data *data, int group,
struct grub_ext2_block_group *blkgrp)
{
return grub_disk_read (data->disk,
(grub_fshelp_map_block (data->journal,
grub_le_to_cpu32 (data->sblock.first_data_block) + 1)
<< LOG2_EXT2_BLOCK_SIZE (data)),
group * sizeof (struct grub_ext2_block_group),
sizeof (struct grub_ext2_block_group), (char *) blkgrp);
return grub_fshelp_read (data->disk, data->journal,
grub_le_to_cpu32 (data->sblock.first_data_block) + 1,
group * sizeof (struct grub_ext2_block_group),
sizeof (struct grub_ext2_block_group),
(char *) blkgrp, LOG2_EXT2_BLOCK_SIZE (data));
}
@ -283,11 +282,9 @@ grub_ext2_read_block (grub_fshelp_node_t node, grub_disk_addr_t fileblock)
{
grub_uint32_t indir[blksz / 4];
if (grub_disk_read (data->disk,
grub_fshelp_map_block(data->journal,
grub_le_to_cpu32 (inode->blocks.indir_block))
<< log2_blksz,
0, blksz, (char *) indir))
if (grub_fshelp_read (data->disk, data->journal,
grub_le_to_cpu32 (inode->blocks.indir_block),
0, blksz, (char *) indir, log2_blksz))
return grub_errno;
blknr = grub_le_to_cpu32 (indir[fileblock - INDIRECT_BLOCKS]);
@ -300,18 +297,14 @@ grub_ext2_read_block (grub_fshelp_node_t node, grub_disk_addr_t fileblock)
+ blksz / 4);
grub_uint32_t indir[blksz / 4];
if (grub_disk_read (data->disk,
grub_fshelp_map_block(data->journal,
grub_le_to_cpu32 (inode->blocks.double_indir_block))
<< log2_blksz,
0, blksz, (char *) indir))
if (grub_fshelp_read (data->disk, data->journal,
grub_le_to_cpu32 (inode->blocks.double_indir_block),
0, blksz, (char *) indir, log2_blksz))
return grub_errno;
if (grub_disk_read (data->disk,
grub_fshelp_map_block(data->journal,
grub_le_to_cpu32 (indir[rblock / perblock]))
<< log2_blksz,
0, blksz, (char *) indir))
if (grub_fshelp_read (data->disk, data->journal,
grub_le_to_cpu32 (indir[rblock / perblock]),
0, blksz, (char *) indir, log2_blksz))
return grub_errno;
@ -372,12 +365,11 @@ grub_ext2_read_inode (struct grub_ext2_data *data,
% inodes_per_block;
/* Read the inode. */
if (grub_disk_read (data->disk,
grub_fshelp_map_block(data->journal,
grub_le_to_cpu32 (blkgrp.inode_table_id) + blkno)
<< LOG2_EXT2_BLOCK_SIZE (data),
EXT2_INODE_SIZE (data) * blkoff,
sizeof (struct grub_ext2_inode), (char *) inode))
if (grub_fshelp_read (data->disk, data->journal,
grub_le_to_cpu32 (blkgrp.inode_table_id) + blkno,
EXT2_INODE_SIZE (data) * blkoff,
sizeof (struct grub_ext2_inode), (char *) inode,
LOG2_EXT2_BLOCK_SIZE (data)))
return grub_errno;
return 0;

39
fs/fshelp.c
View file

@ -215,6 +215,45 @@ grub_fshelp_find_file (const char *path, grub_fshelp_node_t rootnode,
}
/* Read LEN bytes from the block BLOCK on disk DISK into the buffer BUF,
beginning with the block POS. Apply mappings from LOG. The blocks
have a size of LOG2BLOCKSIZE (in log2). */
grub_err_t grub_fshelp_read (grub_disk_t disk, grub_fshelp_journal_t log,
grub_disk_addr_t block, grub_off_t pos,
grub_size_t len, char *buf, int log2blocksize)
{
grub_off_t relblk;
relblk = pos >> (log2blocksize + GRUB_DISK_SECTOR_BITS);
block += relblk;
pos -= relblk << (log2blocksize + GRUB_DISK_SECTOR_BITS);
while (len > 0)
{
grub_err_t ret;
grub_size_t size;
size = (GRUB_DISK_SECTOR_SIZE << log2blocksize) - pos;
if (size > len)
size = len;
ret = grub_disk_read (disk,
grub_fshelp_map_block (log, block) << log2blocksize,
pos, size, buf);
if (ret)
return ret;
block++;
pos = 0;
buf += size;
len -= size;
}
return 0;
}
/* Read LEN bytes from the file NODE on disk DISK into the buffer BUF,
beginning with the block POS. READ_HOOK should be set before
reading a block from the file. GET_BLOCK is used to translate file

9
include/grub/fshelp.h
View file

@ -84,6 +84,15 @@ EXPORT_FUNC(grub_fshelp_find_file) (const char *path,
enum grub_fshelp_filetype expect);
/* Read LEN bytes from the block BLOCK on disk DISK into the buffer BUF,
beginning with the block POS. Apply mappings from LOG. The blocks
have a size of LOG2BLOCKSIZE (in log2). */
grub_err_t
EXPORT_FUNC(grub_fshelp_read) (grub_disk_t disk, grub_fshelp_journal_t log,
grub_disk_addr_t block, grub_off_t pos,
grub_size_t len, char *buf, int log2blocksize);
/* Read LEN bytes from the file NODE on disk DISK into the buffer BUF,
beginning with the block POS. READ_HOOK should be set before
reading a block from the file. GET_BLOCK is used to translate file