NFSv4: Express delegation limit in units of pages
Since we're tracking modifications to the page cache on a per-page
basis, it makes sense to express the limit to how much we may cache
in units of pages.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index ff4784c..788adf3 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -4932,24 +4932,28 @@
}
/* This is too sick! */
-static int decode_space_limit(struct xdr_stream *xdr, u64 *maxsize)
+static int decode_space_limit(struct xdr_stream *xdr,
+ unsigned long *pagemod_limit)
{
__be32 *p;
uint32_t limit_type, nblocks, blocksize;
+ u64 maxsize = 0;
p = xdr_inline_decode(xdr, 12);
if (unlikely(!p))
goto out_overflow;
limit_type = be32_to_cpup(p++);
switch (limit_type) {
- case 1:
- xdr_decode_hyper(p, maxsize);
+ case NFS4_LIMIT_SIZE:
+ xdr_decode_hyper(p, &maxsize);
break;
- case 2:
+ case NFS4_LIMIT_BLOCKS:
nblocks = be32_to_cpup(p++);
blocksize = be32_to_cpup(p);
- *maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
+ maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
}
+ maxsize >>= PAGE_CACHE_SHIFT;
+ *pagemod_limit = min_t(u64, maxsize, ULONG_MAX);
return 0;
out_overflow:
print_overflow_msg(__func__, xdr);
@@ -4977,7 +4981,7 @@
break;
case NFS4_OPEN_DELEGATE_WRITE:
res->delegation_type = FMODE_WRITE|FMODE_READ;
- if (decode_space_limit(xdr, &res->maxsize) < 0)
+ if (decode_space_limit(xdr, &res->pagemod_limit) < 0)
return -EIO;
}
return decode_ace(xdr, NULL, res->server->nfs_client);