12-04-2007
Quote:
Originally Posted by
Legend986
I know I'm missing something but I don't understand what I'm missing....
clusters!
the list of "things" that are referenced in each directory entry are clusters, not sectors.
A single disk can contain a maximum of 255 clusters, where a cluster contains 2^N sectors, and a sector is 128 bytes.
If a single byte is used to indicate how many 128byte sectors are used in a cluster then depending on the algorithm you have either a max of 128 or 256 sectors per cluster, giving an absolute max disk size of ether 4Mb or 8Mb.
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dir_ufs(4) File Formats dir_ufs(4)
NAME
dir_ufs, dir - format of ufs directories
SYNOPSIS
#include <sys/param.h>
#include <sys/types.h>
#include <sys/fs/ufs_fsdir.h>
DESCRIPTION
A directory consists of some number of blocks of DIRBLKSIZ bytes, where DIRBLKSIZ is chosen such that it can be transferred to disk in a
single atomic operation, for example, 512 bytes on most machines.
Each DIRBLKSIZ-byte block contains some number of directory entry structures, which are of variable length. Each directory entry has a
struct direct at the front of it, containing its inode number, the length of the entry, and the length of the name contained in the entry.
These entries are followed by the name padded to a 4 byte boundary with null bytes. All names are guaranteed null-terminated. The maximum
length of a name in a directory is MAXNAMLEN.
#define DIRBLKSIZ DEV_BSIZE
#define MAXNAMLEN 256
struct direct {
ulong_t d_ino; /* inode number of entry */
ushort_t d_reclen; /* length of this record */
ushort_t d_namlen; /* length of string in d_name */
char d_name[MAXNAMLEN + 1]; /* maximum name length */
};
ATTRIBUTES
See attributes(5) for a description of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Unstable |
+-----------------------------+-----------------------------+
SEE ALSO
attributes(5), ufs(7FS)
SunOS 5.10 16 Apr 2003 dir_ufs(4)