Commit dbd040b4 authored Sep 19, 2017 by J. Bruce Fields Committed by Greg Kroah-Hartman Aug 04, 2019

nfsd: increase DRC cache limit



[ Upstream commit 44d8660d3bb0a1c8363ebcb906af2343ea8e15f6 ]

An NFSv4.1+ client negotiates the size of its duplicate reply cache size
in the initial CREATE_SESSION request.  The server preallocates the
memory for the duplicate reply cache to ensure that we'll never fail to
record the response to a nonidempotent operation.

To prevent a few CREATE_SESSIONs from consuming all of memory we set an
upper limit based on nr_free_buffer_pages().  1/2^10 has been too
limiting in practice; 1/2^7 is still less than one percent.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

parent 2d9b39de

fs/nfsd/nfssvc.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -430,7 +430,7 @@ void nfsd_reset_versions(void)
		*/
		static void set_max_drc(void)
		{
		#define NFSD_DRC_SIZE_SHIFT 10
		#define NFSD_DRC_SIZE_SHIFT 7
		nfsd_drc_max_mem = (nr_free_buffer_pages()
		>> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE;
		nfsd_drc_mem_used = 0;