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cc5a92334f
freebsd/sys
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Kirk McKusick cc5a92334f Minimize the time necessary to suspend operations on a filesystem 
when taking a snapshot. The two time consuming operations are
scanning all the filesystem bitmaps to determine which blocks
are in use and scanning all the other snapshots so as to be able
to expunge their blocks from the view of the current snapshot.
The bitmap scanning is broken into two passes. Before suspending
the filesystem all bitmaps are scanned. After the suspension,
those bitmaps that changed after being scanned the first time
are rescanned. Typically there are few bitmaps that need to be
rescanned. The expunging of other snapshots is now done after
the suspension is released by observing that we can easily
identify any blocks that were allocated to them after the
suspension (they will be maked as `not needing to be copied'
in the just created snapshot). For all the gory details, see
the ``Running fsck in the Background'' paper in the Usenix
BSDCon 2002 Conference Proceedings, pages 55-64.
2001-12-14 00:15:06 +00:00
..
alpha Overhaul the per-CPU support a bit: 2001-12-11 23:33:44 +00:00
amd64 Axe an unneeded PCPU_SET(spinlocks, NULL) that I missed earlier. 2001-12-12 08:07:41 +00:00
arm We need machine/{signal,ucontext}.h to build a cross GCC compiler. 2001-12-09 19:39:49 +00:00
boot MFi386: revision 1.35 (Add support for writing to BIOS disks) 2001-12-12 13:47:04 +00:00
cam Remove PAO3 dependent part where I missed to remove at last commit. 2001-12-10 02:07:34 +00:00
coda Update to C99, s/__FUNCTION__/__func__/, 2001-12-10 08:09:49 +00:00
compat Update to C99, s/__FUNCTION__/__func__/, 2001-12-10 08:09:49 +00:00
conf Back out my "joy" change. It was really the for some uncommitted ata 2001-12-07 01:52:40 +00:00
contrib Fix initialisation of struct nat entry, to solve a panic that occurs 2001-12-05 10:46:24 +00:00
crypto fixed the cast128 calculation with a short cipher key length. 2001-11-27 14:11:47 +00:00
ddb Implement a "kill" DDB command which is an interface to psignal() that 2001-11-27 19:56:28 +00:00
dev Convert C++ style comments to proper C ones. 2001-12-13 23:48:34 +00:00
fs Add module dependency on libmchain. 2001-12-13 13:08:34 +00:00
geom Return EOPNOTSUPP for unknown module events. 2001-11-17 00:46:08 +00:00
gnu Update to C99, s/__FUNCTION__/__func__/, 2001-12-10 08:09:49 +00:00
i4b Update to C99, s/__FUNCTION__/__func__/, 2001-12-10 08:09:49 +00:00
i386 Axe an unneeded PCPU_SET(spinlocks, NULL) that I missed earlier. 2001-12-12 08:07:41 +00:00
ia64 Overhaul the per-CPU support a bit: 2001-12-11 23:33:44 +00:00
isa Update to C99, s/__FUNCTION__/__func__/, 2001-12-10 08:09:49 +00:00
isofs/cd9660 Fix mounting root from a ISO9660 filesystem on a SCSI CDROM. 2001-11-27 03:55:43 +00:00
kern If we were called to allocate a vnode that is not associated with a 2001-12-13 23:46:01 +00:00
libkern rcsid[]->__FBSDID 2001-11-07 19:55:16 +00:00
modules Connect libiconv to the build. 2001-12-12 10:11:16 +00:00
net Update to C99, s/__FUNCTION__/__func__/, 2001-12-10 08:09:49 +00:00
netatalk Give struct socket structures a ref counting interface similar to 2001-11-17 03:07:11 +00:00
netatm Give struct socket structures a ref counting interface similar to 2001-11-17 03:07:11 +00:00
netgraph Update to C99, s/__FUNCTION__/__func__/, 2001-12-10 08:09:49 +00:00
netinet Undo one of my last minute changes; move sc_iss up earlier so it 2001-12-13 04:05:26 +00:00
netinet6 Update to C99, s/__FUNCTION__/__func__/, 2001-12-10 08:09:49 +00:00
netipx Give struct socket structures a ref counting interface similar to 2001-11-17 03:07:11 +00:00
netkey Newer SA is prefered for a out-bound packet than old one 2001-12-05 05:40:49 +00:00
netnatm Give struct socket structures a ref counting interface similar to 2001-11-17 03:07:11 +00:00
netncp Update to C99, s/__FUNCTION__/__func__/, 2001-12-10 08:09:49 +00:00
netns Give struct socket structures a ref counting interface similar to 2001-11-17 03:07:11 +00:00
netsmb Update to C99, s/__FUNCTION__/__func__/, 2001-12-10 08:09:49 +00:00
nfs
nfsclient o Modify nfslockdans() to accept a thread reference instead of a proc 2001-11-14 18:20:45 +00:00
nfsserver When VOP_SYMLINK fails, the value of *vpp is junk, so we must NULL 2001-12-04 16:53:42 +00:00
pc98 MFi386: revision 1.485 (the previous commit is not completely) 2001-12-12 12:27:59 +00:00
pccard Better error message when cardtype is not recognized 2001-11-13 06:46:19 +00:00
pci Avoid an unnecessary copy of a packet if it is already in a single mbuf. 2001-12-11 02:47:53 +00:00
posix4
powerpc Overhaul the per-CPU support a bit: 2001-12-11 23:33:44 +00:00
rpc
security/lomac Split out NAI Labs license and BSD license to prevent the accidental 2001-12-03 00:21:18 +00:00
sparc64 Overhaul the per-CPU support a bit: 2001-12-11 23:33:44 +00:00
svr4
sys Remove stale prototype for sonewconn3(). 2001-12-13 22:16:54 +00:00
tools Move from using PCCARD_ symbols gereated from this file to using PCMCIA_ 2001-11-11 20:15:06 +00:00
ufs Minimize the time necessary to suspend operations on a filesystem 2001-12-14 00:15:06 +00:00
vm vm/vm_kern.c: rate limit (to once per second) diagnostic printf when 2001-12-01 00:21:30 +00:00
Makefile