DIR_UFS(4) File Formats and Configurations 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)


April 16, 2003 DIR_UFS(4)