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68da9ba4ee
linux/net
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Venkateswararao Jujjuri (JV) 68da9ba4ee [net/9p]: Introduce basic flow-control for VirtIO transport. 
Recent zerocopy work in the 9P VirtIO transport maps and pins
user buffers into kernel memory for the server to work on them.
Since the user process can initiate this kind of pinning with a simple
read/write call, thousands of IO threads initiated by the user process can
hog the system resources and could result into denial of service.

This patch introduces flow control to avoid that extreme scenario.

The ceiling limit to avoid denial of service attacks is set to relatively
high (nr_free_pagecache_pages()/4) so that it won't interfere with
regular usage, but can step in extreme cases to limit the total system
hang. Since we don't have a global structure to accommodate this variable,
I choose the virtio_chan as the home for this.

Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Reviewed-by: Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-22 16:32:50 -05:00
..
9p [net/9p]: Introduce basic flow-control for VirtIO transport. 2011-03-22 16:32:50 -05:00
802
8021q vlan: should take into account needed_headroom 2011-03-18 15:13:12 -07:00
appletalk net/appletalk: fix atalk_release use after free 2011-03-21 18:18:00 -07:00
atm ipv4: Create and use route lookup helpers. 2011-03-12 15:08:42 -08:00
ax25
batman-adv Merge branch 'batman-adv/next' of git://git.open-mesh.org/ecsv/linux-merge 2011-03-07 00:37:13 -08:00
bluetooth Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2011-03-18 10:35:30 -07:00
bridge bridge: Reset IPCB when entering IP stack on NF_FORWARD 2011-03-18 15:13:12 -07:00
caif
can
ceph libceph: fix msgr standby handling 2011-03-04 12:25:05 -08:00
core net: fix incorrect spelling in drop monitor protocol 2011-03-21 18:20:26 -07:00
dcb net: dcbnl: Update copyright dates 2011-03-14 17:02:42 -07:00
dccp net: Put fl6_* macros to struct flowi6 and use them again. 2011-03-12 15:08:55 -08:00
decnet decnet: Convert to use flowidn where applicable. 2011-03-12 15:08:55 -08:00
dns_resolver DNS: Fix a NULL pointer deref when trying to read an error key [CVE-2011-1076] 2011-03-04 09:56:19 +11:00
dsa dsa/mv88e6060: support nonzero mii base address 2011-03-08 14:24:20 -08:00
econet econet: 4 byte infoleak to the network 2011-03-18 15:12:15 -07:00
ethernet
ieee802154
ipv4 netfilter: ipt_CLUSTERIP: fix buffer overflow 2011-03-20 15:42:52 +01:00
ipv6 net ipv6: Fix duplicate /proc/sys/net/ipv6/neigh directory entries. 2011-03-21 18:23:34 -07:00
ipx ipx: fix ipx_release() 2011-03-21 18:16:39 -07:00
irda tty: now phase out the ioctl file pointer for good 2011-02-17 11:59:56 -08:00
iucv
key pfkey: fix warning 2011-03-01 22:51:52 -08:00
l2tp l2tp: fix possible oops on l2tp_eth module unload 2011-03-21 18:10:25 -07:00
lapb
llc llc: avoid skb_clone() if there is only one handler 2011-02-28 12:28:50 -08:00
mac80211 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-03-18 10:37:40 -07:00
netfilter IPVS: Use global mutex in ip_vs_app.c 2011-03-21 20:39:24 -07:00
netlabel netlink: kill loginuid/sessionid/sid members from struct netlink_skb_parms 2011-03-03 10:55:40 -08:00
netlink Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2011-03-03 21:27:42 -08:00
netrom
packet af_packet: struct socket declared/assigned but unused 2011-03-07 15:51:13 -08:00
phonet Phonet: fix aligned-mode pipe socket buffer header reserve 2011-03-15 14:55:49 -07:00
rds Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2011-03-16 16:29:25 -07:00
rfkill
rose
rxrpc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2011-03-16 16:29:25 -07:00
sched ipv4: Remove flowi from struct rtable. 2011-03-04 21:55:31 -08:00
sctp ipv6: Convert to use flowi6 where applicable. 2011-03-12 15:08:54 -08:00
sunrpc Merge branch 'nfs-for-2.6.39' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6 2011-03-17 17:40:00 -07:00
tipc tipc: delete extra semicolon blocking node deletion 2011-03-14 12:21:12 -04:00
unix Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2011-03-16 16:29:25 -07:00
wanrouter
wimax
wireless Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6 into for-davem 2011-03-15 14:16:48 -04:00
x25 x25: remove the BKL 2011-03-05 10:55:45 +01:00
xfrm xfrm: Fix initialize repl field of struct xfrm_state 2011-03-21 18:08:28 -07:00
compat.c
Kconfig
Makefile net: Enter net/ipv6/ even if CONFIG_IPV6=n 2011-03-07 12:50:52 -08:00
nonet.c
socket.c ethtool: Compat handling for struct ethtool_rxnfc 2011-03-18 15:13:11 -07:00
sysctl_net.c
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