Kirk McKusick 5bb651cb72 This patch fixes a deadlock between the bufdaemon and a process taking ... a snapshot. As part of taking a snapshot of a filesystem, the kernel builds up a list of the filesystem metadata (such as the cylinder group bitmaps) that are contained in the snapshot. When doing a copy-on-write check, the list is first consulted. If the block being written is found on the list, then the full snapshot lookup can be avoided. Besides providing an important performance speedup this check also avoids a potential deadlock between the code creating the snapshot and the bufdaemon trying to cleanup snapshot related buffers. This fix creates a temporary list containing the key metadata blocks that can cause the deadlock. This temporary list is used between the time that the snapshot is first enabled and the time that the fully complete list is built. Reported by: Attila Nagy <bra@fsn.hu> Sponsored by: DARPA & NAI Labs.		2003-02-22 00:59:34 +00:00
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alpha	Change the console interface to pass a "struct consdev *" instead of a	2003-02-20 20:54:45 +00:00
amd64	Fix fumble in rev 1.525. pmap_kenter()'s second argument is a physical	2003-02-20 05:35:52 +00:00
arm	MB_LEN_MAX is not MD, move it to the MI limits.h.	2002-12-22 06:38:45 +00:00
boot	Simplify page alignment.	2003-02-20 06:47:54 +00:00
cam	NO_GEOM cleanup:	2003-02-21 19:00:48 +00:00
coda	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
compat	Add M_WAITOK	2003-02-20 11:24:55 +00:00
conf	Overhaul the targets and hope this is now much more readable.	2003-02-21 11:02:49 +00:00
contrib	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
crypto	Remove some unnecessary casts.	2003-01-25 22:41:22 +00:00
ddb	- Split the struct kse into struct upcall and struct kse. struct kse will	2003-02-17 05:14:26 +00:00
dev	NO_GEOM cleanup: Convert CCD(4) to be use "struct disk*" instead of "dev_t"	2003-02-21 23:25:43 +00:00
fs	Do not call smbfs_attr_cacheremove() in the EXDEV case in smbfs_rename().	2003-02-19 11:54:35 +00:00
geom	NO_GEOM cleanup: Convert CCD(4) to be use "struct disk*" instead of "dev_t"	2003-02-21 23:25:43 +00:00
gnu	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
i4b	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
i386	Change the console interface to pass a "struct consdev *" instead of a	2003-02-20 20:54:45 +00:00
ia64	Change the console interface to pass a "struct consdev *" instead of a	2003-02-20 20:54:45 +00:00
isa	Switch to using the TSC code in i386/i386/tsc.c.	2003-02-11 11:43:25 +00:00
isofs/cd9660	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
kern	Missing M_TRYWAIT from so_upcall third argument.	2003-02-21 22:23:40 +00:00
libkern	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
modules	Split the arch-specific AGP files into the appropriate files.* and do the same	2003-02-14 06:33:52 +00:00
net	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
netatalk	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
netatm	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
netgraph	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
netinet	- m = m_gethdr(M_NOWAIT, MT_HEADER);	2003-02-21 23:17:12 +00:00
netinet6	Remove unused variables in the IPSEC case.	2003-02-20 18:22:21 +00:00
netipsec	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
netipx	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
netkey	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
netnatm	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
netncp	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
netns	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
netsmb	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
nfs	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
nfsclient	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
nfsserver	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
opencrypto	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
pc98	Change the console interface to pass a "struct consdev *" instead of a	2003-02-20 20:54:45 +00:00
pccard	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
pci	Fix panic on sparc64 introduced in my last commit. I really	2003-02-19 18:33:29 +00:00
posix4	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
powerpc	Adjust IRQ count for psim's OpenPIC model - it seems to be	2003-02-20 01:59:42 +00:00
rpc
security	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
sparc64	Uncomment the xl(4) driver since it's now working properly	2003-02-20 17:08:42 +00:00
sys	NO_GEOM cleanup: Convert CCD(4) to be use "struct disk*" instead of "dev_t"	2003-02-21 23:25:43 +00:00
tools	Remove miidevs.h and generate it from miidevs at compile time.	2003-01-19 02:59:34 +00:00
ufs	This patch fixes a deadlock between the bufdaemon and a process taking	2003-02-22 00:59:34 +00:00
vm	Back out M_* changes, per decision of the TRB.	2003-02-19 05:47:46 +00:00
Makefile