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

fs_vxfs(4) fs_vxfs(4)

fsadm_vxfs (1M) for a description of ﬁle system expansion.

VX_UPGRADING Set when a ﬁle system upgrade is in progress. If an

fsck

detects this ﬂag, it performs an upgrade recovery.

fs_fname File system name (6 characters).

fs_fpack File system pack label (6 characters).

fs_free The number of free data blocks.

fs_logversion The version number of the log format. Set by the kernel on each mount to ensure

that an fsck running log replay understands the log format written by the ker-

nel.

The log format may change with each release, so all ﬁle systems should be clean

before upgrading to a new release.

fs_mod Set whenever a mounted ﬁle system is modiﬁed. It indicates whether the super-

block requires rewriting when a sync operation is performed.

fs_reserved Reserved for future use.

fs_time Last time the super-block was written to disk, indicated as the number of

seconds and microseconds that have elapsed since 0:00:00 GMT January 1, 1970.

The following ﬁelds are required by VxFS Version 2 disk layouts and later. These ﬁelds are set when the

ﬁle system is created and do not change. They are replicated in each allocation unit header.

fs_checksum2 A checksum of ﬁelds.

fs_dinosize The size, in bytes, of a disk inode. Currently 256 bytes.

fs_dniaddr The number of indirect address levels per inode.

fs_iauimlen The length, in blocks, of a free inode map in an inode allocation unit.

fs_iausize The size, in blocks, of an inode allocation unit.

fs_oltsize The size, in blocks, of the object location table extents pointed to by

fs_oltext.

fs_oltext An array of two extent addresses. These extent addresses point to the two repli-

cated copies of the ﬁrst object location table extent.