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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>		14 years ago
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Kconfig	9p: disallow RDMA if RDMA CM isn't available	16 years ago
Makefile	[net/9p] Preparation and helper functions for zero copy	14 years ago
client.c	net/9p: Convert the in the 9p rpc call path to GFP_NOFS	14 years ago
error.c	net/9p: insulate the client against an invalid error code sent by a 9p server	16 years ago
mod.c	9p: consolidate transport structure	17 years ago
protocol.c	net/9p: Convert the in the 9p rpc call path to GFP_NOFS	14 years ago
protocol.h	9P2010.L handshake: Remove "dotu" variable	15 years ago
trans_common.c	net/9p: Fix compile warning	14 years ago
trans_common.h	[net/9p] Add gup/zero_copy support to VirtIO transport layer.	14 years ago
trans_fd.c	net/9p: Convert the in the 9p rpc call path to GFP_NOFS	14 years ago
trans_rdma.c	net/9p: Convert the in the 9p rpc call path to GFP_NOFS	14 years ago
trans_virtio.c	[net/9p]: Introduce basic flow-control for VirtIO transport.	14 years ago
util.c	net/9p: Convert the in the 9p rpc call path to GFP_NOFS	14 years ago