As far as possible, for both of these information, it is NOT saved in the storage space. reason is because it is supposed to be calculated.
For example - from kernel source fs/ext2/inode.c:
static struct ext2_inode *ext2_get_inode(struct super_block *sb, ino_t ino,
struct buffer_head **p)
{
*p = NULL;
if ((ino != EXT2_ROOT_INO && ino < EXT2_FIRST_INO(sb)) ||
ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
goto Einval;
block_group = (ino - 1) / EXT2_INODES_PER_GROUP(sb);
gdp = ext2_get_group_desc(sb, block_group, NULL);
if (!gdp)
goto Egdp;
/*
* Figure out the offset within the block group inode table
*/
offset = ((ino - 1) % EXT2_INODES_PER_GROUP(sb)) * EXT2_INODE_SIZE(sb);
block = le32_to_cpu(gdp->bg_inode_table) +
(offset >> EXT2_BLOCK_SIZE_BITS(sb));
if (!(bh = sb_bread(sb, block)))
goto Eio;
*p = bh;
offset &= (EXT2_BLOCK_SIZE(sb) - 1);
return (struct ext2_inode *) (bh->b_data + offset);
ie, given the inode number deduce the block number (from kernel source):
block_group = (ino - 1) / EXT2_INODES_PER_GROUP(sb);
given the inode number....derive the offset ptr to the inode structure inside the inode table.
http://www.nongnu.org/ext2-doc/ext2.html---> lookup section 3.6 for the formula calculation.
On Tue, Mar 10, 2009 at 4:48 AM, Manish Katiyar <mkatiyar@xxxxxxxxx> wrote:
On Tue, Mar 10, 2009 at 1:06 PM, Sagar lokhande <sagar007rocs@xxxxxxxxx> wrote:
> hi all
> how can i find the inode block address?
[ccing kernelnewbies]
What do you mean by that ? Do you mean the block numbers for a
particular inode ??
Thanks -
Manish
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Regards,
Peter Teoh
