While touching all vptofh/fhtovp functions, get rid of VFS_MAXFIDSIZ,
version the getfh(2) syscall and explicitly pass the size available in
the filehandle from userland.
Discussed on tech-kern, with lots of help from yamt (thanks!).
matter how empty they are.
Note that if two blocks have the same inode and block number, they sort
the same (this should never happen, but if it does there's no reason to
have qsort scramble the list).
Add some diagnostic syslog messages for unusual cases.
In determining when to stop reading segments when counting bytes (-b flag),
total the sizes of the blocks we're actually writing instead of assuming
they are all full blocks: many could be fragments or inode blocks. This
increases the number of segments per Ifile write, markedly improving the
efficiency of the cleaner in the small file case.
indirect block when considering the cleaning of block numbers less
than NDADDR (which do not use indirect blocks).
Also, note the loss of only half a block per segment to fragmentation
when considering the benefit function, rather than a whole block.
cleaner, but with more legible code.
Includes code for reading and writing to the raw disk device (so that an
unmounted fs could be cleaned), for the use of a single daemon to clean
multiple filesystems to save on resources, and for recording the old
contents of cleaned segments to offline storage for regression testing of
the LFS system as a whole; though these new features are not properly
tested at this point.
