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| author | NeilBrown <neilb@suse.de> | 2006-10-04 02:15:47 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-04 07:55:15 -0700 |
| commit | 3cc03b164cf01c6f36e64720b58610d292fb26f7 (patch) | |
| tree | b558e11a087945ad5b9a1a25483aa2acc8d93fbb /fs/nfsd/nfsxdr.c | |
| parent | 4452435948424e5322c2a2fefbdc2cf3732cc45d (diff) | |
| download | linux-3cc03b164cf01c6f36e64720b58610d292fb26f7.tar.gz | |
[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.c | 22 |
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 |