How much are filesystem images trusted?

[Matthew Dillon]

:It consists of two small changes:
: - Check that the tail_size is reported at least the size of a tail
:fifo structure (instead of at least 0) -- this will cause an EIO
:instead of a loop or panic.
: - If an error occured in hammer_recover, an io lock leak caused a
:panic.  I now skip the (last) flush if an error occured during mount.
:This seems safe -- doesn't matter too much, you're screwed at this
:point.
:
:-- Dion

    I've got a patch set almost ready that includes your tail size
    check and adds a discard mode to the buffer flush so I can also
    call it from the umount code (read-only mounts that succeed must
    also discard the recovered buffers at umount time), plus also when
    the undo operation fails to get rid of the 'recovered' buffer
    references.

    Is the io lock leak the 'recovered' designation issue?  If so then I
    have it covered.  If there is a different leak I could use a pointer
    to it.

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>