HP-UX Reference (11i v2 03/08) - 4 File Formats (vol 8)

i
inode_vxfs(4) inode_vxfs(4)
NAME
inode_vxfs - format of a VxFS file system inode
SYNOPSIS
#include <sys/types.h>
#include <sys/fs/vx_inode.h>
DESCRIPTION
A VxFS inode is typically 256 bytes in length, but an inode can also be 512 bytes. You specify the inode
size with mkfs.
An inode entry has the following format:
i_mode The mode and type of file.
i_nlink The number of links to the file.
i_uid The inode owner.
i_gid The inode group.
i_size The size in bytes of the file. Eight bytes are allocated.
i_atime Time of last access, in struct timeval format.
i_mtime Time of last modification, in struct timeval format.
i_ctime Time of last inode change, in struct timeval format.
i_aflags These flags control the allocation and extension of files:
VX_AF_IBAD If set, the inode is invalid. Cleared when fsck is run.
VX_AF_NOEXTEND If set, the file cannot be extended after the current reservation is
exceeded. The reservation can be increased by the VX_SETEXT
ioctl, but the file is not automatically extended.
VX_AF_NOGROW If set, the file cannot be extended after the current reservation is
exceeded. This flag is typically set because an I/O error occurred
while extending a file. Cleared on truncation or when setext is
run.
VX_AF_ALIGN If set, the file must be allocated in extents of a fixed size and
alignment. If an extent of i_fixextsize blocks aligned on an
i_fixextsize boundary cannot be found, then the allocation fails.
The alignment is relative to the beginning of the allocation unit.
i_orgtype Mapping type. Indicates how to interpret the inode mapping area. Currently there are
four supported mapping types:
IORG_NONE Mapping area is unused. IORG_NONE is used for files that have
no associated data storage. Because there is no need for either
extents or immediate data, the mapping area is unused. Block
and character special files, for example, use this organization
type.
IORG_EXT4 Mapping area consists of an array of 32-bit extent block
addresses and sizes.
IORG_IMMED Mapping area itself is a data block. This mapping is referred to
as Immediate Inode Data.
IORG_TYPED Mapping area consists of typed-extent structures.
i_eopflags Extended inode operation flag area.
i_eopdata Extended inode operation data area.
i_ftarea This field is a union. The contents are determined by file type.
For devices, the following field is supported:
i_rdev The device number of a block or character special device.
Section 4−−146 Hewlett-Packard Company − 1 − HP-UX 11i Version 2: August 2003