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CVS: cvs.openbsd.org: src

Module name:	src
Changes by:	gluk_(_at_)_cvs_(_dot_)_openbsd_(_dot_)_org	2001/04/12 20:39:06

Modified files:
	sys/ufs/ffs    : fs.h ffs_vfsops.c 
	sbin/fsck_ffs  : setup.c utilities.c 
	sbin/dumpfs    : dumpfs.c 
	sbin/newfs     : mkfs.c 

Log message:
Fix overflow in superblock. From FreeBSD.

FreeBSD's log:
> The ffs superblock includes a 128-byte region for use by temporary
> in-core pointers to summary information. An array in this region
> (fs_csp) could overflow on filesystems with a very large number of
> cylinder groups (~16000 on i386 with 8k blocks). When this happens,
> other fields in the superblock get corrupted, and fsck refuses to
> check the filesystem.
> Solve this problem by replacing the fs_csp array in 'struct fs'
> with a single pointer, and add padding to keep the length of the
> 128-byte region fixed. Update the kernel and userland utilities
> to use just this single pointer.
> With this change, the kernel no longer makes use of the superblock
> fields 'fs_csshift' and 'fs_csmask'. Add a comment to newfs/mkfs.c
> to indicate that these fields must be calculated for compatibility
> with older kernels.

art@ ok.

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