Clean up.
The trend in the other XDR encoder functions is to BUG() when encoding
problems occur, since a problem here is always due to a local coding
error. Then, instead of a status, zero is unconditionally returned.
Update the mount client XDR encoders to behave this way.
To finish the update, use the new-style be32_to_cpup() and
cpu_to_be32() macros, and compute the buffer sizes using raw integers
instead of sizeof(). This matches the conventions used in other XDR
functions.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Tested-by: J. Bruce Fields <bfields@xxxxxxxxxx>
---
fs/nfs/mount_clnt.c | 35 +++++++++++++++--------------------
1 files changed, 15 insertions(+), 20 deletions(-)
diff --git a/fs/nfs/mount_clnt.c b/fs/nfs/mount_clnt.c
index 4f981f1..c82547e 100644
--- a/fs/nfs/mount_clnt.c
+++ b/fs/nfs/mount_clnt.c
@@ -280,20 +280,14 @@ out_call_err:
* XDR encode/decode functions for MOUNT
*/
-static int encode_mntdirpath(struct xdr_stream *xdr, const char *pathname)
+static void encode_mntdirpath(struct xdr_stream *xdr, const char *pathname)
{
const u32 pathname_len = strlen(pathname);
__be32 *p;
- if (unlikely(pathname_len > MNTPATHLEN))
- return -EIO;
-
- p = xdr_reserve_space(xdr, sizeof(u32) + pathname_len);
- if (unlikely(p == NULL))
- return -EIO;
+ BUG_ON(pathname_len > MNTPATHLEN);
+ p = xdr_reserve_space(xdr, 4 + pathname_len);
xdr_encode_opaque(p, pathname, pathname_len);
-
- return 0;
}
static int mnt_enc_dirpath(struct rpc_rqst *req, __be32 *p,
@@ -302,7 +296,8 @@ static int mnt_enc_dirpath(struct rpc_rqst *req, __be32 *p,
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
- return encode_mntdirpath(&xdr, dirpath);
+ encode_mntdirpath(&xdr, dirpath);
+ return 0;
}
/*
@@ -320,10 +315,10 @@ static int decode_status(struct xdr_stream *xdr, struct mountres *res)
u32 status;
__be32 *p;
- p = xdr_inline_decode(xdr, sizeof(status));
+ p = xdr_inline_decode(xdr, 4);
if (unlikely(p == NULL))
return -EIO;
- status = ntohl(*p);
+ status = be32_to_cpup(p);
for (i = 0; i < ARRAY_SIZE(mnt_errtbl); i++) {
if (mnt_errtbl[i].status == status) {
@@ -371,10 +366,10 @@ static int decode_fhs_status(struct xdr_stream *xdr, struct mountres *res)
u32 status;
__be32 *p;
- p = xdr_inline_decode(xdr, sizeof(status));
+ p = xdr_inline_decode(xdr, 4);
if (unlikely(p == NULL))
return -EIO;
- status = ntohl(*p);
+ status = be32_to_cpup(p);
for (i = 0; i < ARRAY_SIZE(mnt3_errtbl); i++) {
if (mnt3_errtbl[i].status == status) {
@@ -394,11 +389,11 @@ static int decode_fhandle3(struct xdr_stream *xdr, struct mountres *res)
u32 size;
__be32 *p;
- p = xdr_inline_decode(xdr, sizeof(size));
+ p = xdr_inline_decode(xdr, 4);
if (unlikely(p == NULL))
return -EIO;
- size = ntohl(*p++);
+ size = be32_to_cpup(p);
if (size > NFS3_FHSIZE || size == 0)
return -EIO;
@@ -421,15 +416,15 @@ static int decode_auth_flavors(struct xdr_stream *xdr, struct mountres *res)
if (*count == 0)
return 0;
- p = xdr_inline_decode(xdr, sizeof(entries));
+ p = xdr_inline_decode(xdr, 4);
if (unlikely(p == NULL))
return -EIO;
- entries = ntohl(*p);
+ entries = be32_to_cpup(p);
dprintk("NFS: received %u auth flavors\n", entries);
if (entries > NFS_MAX_SECFLAVORS)
entries = NFS_MAX_SECFLAVORS;
- p = xdr_inline_decode(xdr, sizeof(u32) * entries);
+ p = xdr_inline_decode(xdr, 4 * entries);
if (unlikely(p == NULL))
return -EIO;
@@ -437,7 +432,7 @@ static int decode_auth_flavors(struct xdr_stream *xdr, struct mountres *res)
entries = *count;
for (i = 0; i < entries; i++) {
- flavors[i] = ntohl(*p++);
+ flavors[i] = be32_to_cpup(p++);
dprintk("NFS: auth flavor[%u]: %d\n", i, flavors[i]);
}
*count = i;
--
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