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nfs: simplify nfs4_parse_monolithic 

Remove a level of indentation for the version 1 mount data parsing, and
simplify the NULL data case a little bit as well.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2020-09-17 10:22:32 +02:00 committed by Al Viro
parent 9123e3a74e
commit a1c7dc5d15
1 changed files with 65 additions and 74 deletions
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139
fs/nfs/fs_context.c
View File

@ -1047,89 +1047,80 @@ static int nfs4_parse_monolithic(struct fs_context *fc,
struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
char *c;
if (data == NULL)
goto out_no_data;
if (!data) {
if (is_remount_fc(fc))
goto done;
return nfs_invalf(fc,
"NFS4: mount program didn't pass any mount data");
}
ctx->version = 4;
switch (data->version) {
case 1:
if (data->host_addrlen > sizeof(ctx->nfs_server.address))
goto out_no_address;
if (data->host_addrlen == 0)
goto out_no_address;
ctx->nfs_server.addrlen = data->host_addrlen;
if (copy_from_user(sap, data->host_addr, data->host_addrlen))
if (data->version != 1)
return generic_parse_monolithic(fc, data);
if (data->host_addrlen > sizeof(ctx->nfs_server.address))
goto out_no_address;
if (data->host_addrlen == 0)
goto out_no_address;
ctx->nfs_server.addrlen = data->host_addrlen;
if (copy_from_user(sap, data->host_addr, data->host_addrlen))
return -EFAULT;
if (!nfs_verify_server_address(sap))
goto out_no_address;
ctx->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
if (data->auth_flavourlen) {
rpc_authflavor_t pseudoflavor;
if (data->auth_flavourlen > 1)
goto out_inval_auth;
if (copy_from_user(&pseudoflavor, data->auth_flavours,
sizeof(pseudoflavor)))
return -EFAULT;
if (!nfs_verify_server_address(sap))
goto out_no_address;
ctx->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
if (data->auth_flavourlen) {
rpc_authflavor_t pseudoflavor;
if (data->auth_flavourlen > 1)
goto out_inval_auth;
if (copy_from_user(&pseudoflavor,
data->auth_flavours,
sizeof(pseudoflavor)))
return -EFAULT;
ctx->selected_flavor = pseudoflavor;
} else
ctx->selected_flavor = RPC_AUTH_UNIX;
c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
if (IS_ERR(c))
return PTR_ERR(c);
ctx->nfs_server.hostname = c;
c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
if (IS_ERR(c))
return PTR_ERR(c);
ctx->nfs_server.export_path = c;
dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
c = strndup_user(data->client_addr.data, 16);
if (IS_ERR(c))
return PTR_ERR(c);
ctx->client_address = c;
/*
* Translate to nfs_fs_context, which nfs_fill_super
* can deal with.
*/
ctx->flags = data->flags & NFS4_MOUNT_FLAGMASK;
ctx->rsize = data->rsize;
ctx->wsize = data->wsize;
ctx->timeo = data->timeo;
ctx->retrans = data->retrans;
ctx->acregmin = data->acregmin;
ctx->acregmax = data->acregmax;
ctx->acdirmin = data->acdirmin;
ctx->acdirmax = data->acdirmax;
ctx->nfs_server.protocol = data->proto;
nfs_validate_transport_protocol(ctx);
if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
goto out_invalid_transport_udp;
break;
default:
goto generic;
ctx->selected_flavor = pseudoflavor;
} else {
ctx->selected_flavor = RPC_AUTH_UNIX;
}
c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
if (IS_ERR(c))
return PTR_ERR(c);
ctx->nfs_server.hostname = c;
c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
if (IS_ERR(c))
return PTR_ERR(c);
ctx->nfs_server.export_path = c;
dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
c = strndup_user(data->client_addr.data, 16);
if (IS_ERR(c))
return PTR_ERR(c);
ctx->client_address = c;
/*
* Translate to nfs_fs_context, which nfs_fill_super
* can deal with.
*/
ctx->flags = data->flags & NFS4_MOUNT_FLAGMASK;
ctx->rsize = data->rsize;
ctx->wsize = data->wsize;
ctx->timeo = data->timeo;
ctx->retrans = data->retrans;
ctx->acregmin = data->acregmin;
ctx->acregmax = data->acregmax;
ctx->acdirmin = data->acdirmin;
ctx->acdirmax = data->acdirmax;
ctx->nfs_server.protocol = data->proto;
nfs_validate_transport_protocol(ctx);
if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
goto out_invalid_transport_udp;
done:
ctx->skip_reconfig_option_check = true;
return 0;
generic:
return generic_parse_monolithic(fc, data);
out_no_data:
if (is_remount_fc(fc)) {
ctx->skip_reconfig_option_check = true;
return 0;
}
return nfs_invalf(fc, "NFS4: mount program didn't pass any mount data");
out_inval_auth:
return nfs_invalf(fc, "NFS4: Invalid number of RPC auth flavours %d",
data->auth_flavourlen);