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Jeff Layton cd123012d9 RPC: add wrapper for svc_reserve to account for checksum ... When the kernel calls svc_reserve to downsize the expected size of an RPC reply, it fails to account for the possibility of a checksum at the end of the packet. If a client mounts a NFSv2/3 with sec=krb5i/p, and does I/O then you'll generally see messages similar to this in the server's ring buffer: RPC request reserved 164 but used 208 While I was never able to verify it, I suspect that this problem is also the root cause of some oopses I've seen under these conditions: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=227726 This is probably also a problem for other sec= types and for NFSv4. The large reserved size for NFSv4 compound packets seems to generally paper over the problem, however. This patch adds a wrapper for svc_reserve that accounts for the possibility of a checksum. It also fixes up the appropriate callers of svc_reserve to call the wrapper. For now, it just uses a hardcoded value that I determined via testing. That value may need to be revised upward as things change, or we may want to eventually add a new auth_op that attempts to calculate this somehow. Unfortunately, there doesn't seem to be a good way to reliably determine the expected checksum length prior to actually calculating it, particularly with schemes like spkm3. Signed-off-by: Jeff Layton <jlayton@redhat.com> Acked-by: Neil Brown <neilb@suse.de> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Acked-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		18 years ago
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acpi	PNPACPI sets pnpdev->dev.archdata	18 years ago
asm-alpha	Remove hardcoding of hard_smp_processor_id on UP systems	18 years ago
asm-arm	Use common cpu_is_xxx() macros on AT91 and AVR32	18 years ago
asm-arm26	Remove tas()	18 years ago
asm-avr32	Use common cpu_is_xxx() macros on AT91 and AVR32	18 years ago
asm-blackfin	Remove tas()	18 years ago
asm-cris	move die notifier handling to common code	18 years ago
asm-frv	FRV: Replace pgd management via slabs through quicklists	18 years ago
asm-generic	local_t: architecture independent extension	18 years ago
asm-h8300	Remove tas()	18 years ago
asm-i386	Use the APIC to determine the hardware processor id - i386	18 years ago
asm-ia64	Always ask the hardware to obtain hardware processor id - ia64	18 years ago
asm-m32r	Remove hardcoding of hard_smp_processor_id on UP systems	18 years ago
asm-m68k	m68k: <asm/scatterlist.h> needs <linux/types.h>	18 years ago
asm-m68knommu	Remove tas()	18 years ago
asm-mips	Remove tas()	18 years ago
asm-parisc	local_t: parisc cleanup	18 years ago
asm-powerpc	Remove hardcoding of hard_smp_processor_id on UP systems	18 years ago
asm-ppc	Remove tas()	18 years ago
asm-s390	Remove hardcoding of hard_smp_processor_id on UP systems	18 years ago
asm-sh	Remove tas()	18 years ago
asm-sh64	Remove tas()	18 years ago
asm-sparc	Remove hardcoding of hard_smp_processor_id on UP systems	18 years ago
asm-sparc64	Remove hardcoding of hard_smp_processor_id on UP systems	18 years ago
asm-um	Remove hardcoding of hard_smp_processor_id on UP systems	18 years ago
asm-v850	Remove tas()	18 years ago
asm-x86_64	Use the APIC to determine the hardware processor id - x86_64	18 years ago
asm-xtensa	Remove tas()	18 years ago
crypto	[CRYPTO] cryptd: Add software async crypto daemon	18 years ago
keys	[AF_RXRPC]: Provide secure RxRPC sockets for use by userspace and kernel both	18 years ago
linux	RPC: add wrapper for svc_reserve to account for checksum	18 years ago
math-emu	Delete unused header file math-emu/extended.h	18 years ago
media	i2c: Cleanup the includes of <linux/i2c.h>	18 years ago
mtd	UBI: Unsorted Block Images	18 years ago
net	cleanup compat ioctl handling	18 years ago
pcmcia	add new_id to PCMCIA drivers	18 years ago
rdma	Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband	18 years ago
rxrpc	[AF_RXRPC]: Delete the old RxRPC code.	18 years ago
scsi	[SCSI] sas_scsi_host: Convert to use the kthread API	18 years ago
sound	[ALSA] version 1.0.14rc3	18 years ago
video	atyfb: halve XCLK with Mobility and 32bit memory	18 years ago
Kbuild	…