Correct calculation of number of inodes from density for small filesystems.
Add a '-n inodes' option so that the desired number of inodes can be
explicitly given - init needs this for mfs /dev, -i density is too crude.
first alternate superblock is zerod.
Removes any possibility of any programs using a trully out of date
alternate superblock if a filesystem is remade with a larger block size.
-c used to specify the number of cylinders per group
- but newfs has ignored cylinders for a while.
Changing what -c meant is just asking for trouble!
I might add something to let MINCYL be changed.
- allows less than 'one fragment per inode' (useful for mfs /dev)
- limits number of inodes to 2^31 (they are stored in an int32_t)
- errors if the number of cylinder groups is such that the cylinder group
summary won't fit in the first cylinder group.
- ensures that the last cylinder block contains a valid number of fragments
and inodes, and is not larger than any earlier ones.
- cylinder groups are now created with almost the same size as each other.
Change posted to tech-kern, and no one objected.
80 columns (sysinst uses full width these days).
Use {;} instead of , in a couple of places.
Abort if user tries to make a UFS1 filesytem with > 2^31 fragments.
Abort if the cylinder group summary won't fit into the first cylinder group.
Use pread/pwrite and remove a few redundant casts.
time, and stuff as much precision as possible into as many places as
possible. This includes setting the atime, mtime, and ctime on inode
#2 of a freshly created file system, and the birthtime on a new ffs2
filesystem.
Previously these would all be left at zero, and since the birthtime
only gets set when the inode is allocated (and since inode #2 never
gets recycled), inode #2 would always have a birthtime of the epoch.
64 bit block pointers, extended attribute storage, and a few
other things.
This commit does not yet include the code to manipulate the extended
storage (for e.g. ACLs), this will be done later.
Originally written by Kirk McKusick and Network Associates Laboratories for
FreeBSD.
This is the bulk of PR #17345
The general approach is to use a run time deteriminable value
for DIRBLKSIZ. Additional allowances are included for using
MAXSYMLINKLEN with FS_42INODEFMT and a shift in the cylinder group
cluster summary count array. Support is added for managing
the Apple UFS volume label.
dsl