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authorNeilBrown <neilb@suse.de>2006-10-04 02:15:47 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-04 07:55:15 -0700
commit3cc03b164cf01c6f36e64720b58610d292fb26f7 (patch)
treeb558e11a087945ad5b9a1a25483aa2acc8d93fbb /fs/nfsd/nfsxdr.c
parent4452435948424e5322c2a2fefbdc2cf3732cc45d (diff)
downloadlinux-3cc03b164cf01c6f36e64720b58610d292fb26f7.tar.bz2
[PATCH] knfsd: Avoid excess stack usage in svc_tcp_recvfrom
.. by allocating the array of 'kvec' in 'struct svc_rqst'. As we plan to increase RPCSVC_MAXPAGES from 8 upto 256, we can no longer allocate an array of this size on the stack. So we allocate it in 'struct svc_rqst'. However svc_rqst contains (indirectly) an array of the same type and size (actually several, but they are in a union). So rather than waste space, we move those arrays out of the separately allocated union and into svc_rqst to share with the kvec moved out of svc_tcp_recvfrom (various arrays are used at different times, so there is no conflict). Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/nfsd/nfsxdr.c')
-rw-r--r--fs/nfsd/nfsxdr.c22
1 files changed, 11 insertions, 11 deletions
diff --git a/fs/nfsd/nfsxdr.c b/fs/nfsd/nfsxdr.c
index ad2fba3c54f8..ab6745e78d16 100644
--- a/fs/nfsd/nfsxdr.c
+++ b/fs/nfsd/nfsxdr.c
@@ -263,9 +263,9 @@ nfssvc_decode_readargs(struct svc_rqst *rqstp, u32 *p,
v=0;
while (len > 0) {
pn = rqstp->rq_resused++;
- args->vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
- args->vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE;
- len -= args->vec[v].iov_len;
+ rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
+ rqstp->rq_vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE;
+ len -= rqstp->rq_vec[v].iov_len;
v++;
}
args->vlen = v;
@@ -285,21 +285,21 @@ nfssvc_decode_writeargs(struct svc_rqst *rqstp, u32 *p,
args->offset = ntohl(*p++); /* offset */
p++; /* totalcount */
len = args->len = ntohl(*p++);
- args->vec[0].iov_base = (void*)p;
- args->vec[0].iov_len = rqstp->rq_arg.head[0].iov_len -
+ rqstp->rq_vec[0].iov_base = (void*)p;
+ rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len -
(((void*)p) - rqstp->rq_arg.head[0].iov_base);
if (len > NFSSVC_MAXBLKSIZE)
len = NFSSVC_MAXBLKSIZE;
v = 0;
- while (len > args->vec[v].iov_len) {
- len -= args->vec[v].iov_len;
+ while (len > rqstp->rq_vec[v].iov_len) {
+ len -= rqstp->rq_vec[v].iov_len;
v++;
- args->vec[v].iov_base = page_address(rqstp->rq_pages[v]);
- args->vec[v].iov_len = PAGE_SIZE;
+ rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
+ rqstp->rq_vec[v].iov_len = PAGE_SIZE;
}
- args->vec[v].iov_len = len;
+ rqstp->rq_vec[v].iov_len = len;
args->vlen = v+1;
- return args->vec[0].iov_len > 0;
+ return rqstp->rq_vec[0].iov_len > 0;
}
int