Commit 67e306c6 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Al Viro
Browse files

fs,nfs: lift compat nfs4 mount data handling into the nfs code 



There is no reason the generic fs code should bother with NFS specific
binary mount data - lift the conversion into nfs4_parse_monolithic
instead.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent a1c7dc5d

fs/compat.c

+0 −75
Original line number Diff line number Diff line
@@ -19,73 +19,6 @@ 
#include <linux/uaccess.h>

#include "internal.h"



struct compat_nfs_string {

	compat_uint_t len;

	compat_uptr_t data;

};



static inline void compat_nfs_string(struct nfs_string *dst,

				     struct compat_nfs_string *src)

{

	dst->data = compat_ptr(src->data);

	dst->len = src->len;

}



struct compat_nfs4_mount_data_v1 {

	compat_int_t version;

	compat_int_t flags;

	compat_int_t rsize;

	compat_int_t wsize;

	compat_int_t timeo;

	compat_int_t retrans;

	compat_int_t acregmin;

	compat_int_t acregmax;

	compat_int_t acdirmin;

	compat_int_t acdirmax;

	struct compat_nfs_string client_addr;

	struct compat_nfs_string mnt_path;

	struct compat_nfs_string hostname;

	compat_uint_t host_addrlen;

	compat_uptr_t host_addr;

	compat_int_t proto;

	compat_int_t auth_flavourlen;

	compat_uptr_t auth_flavours;

};



static int do_nfs4_super_data_conv(void *raw_data)

{

	int version = *(compat_uint_t *) raw_data;



	if (version == 1) {

		struct compat_nfs4_mount_data_v1 *raw = raw_data;

		struct nfs4_mount_data *real = raw_data;



		/* copy the fields backwards */

		real->auth_flavours = compat_ptr(raw->auth_flavours);

		real->auth_flavourlen = raw->auth_flavourlen;

		real->proto = raw->proto;

		real->host_addr = compat_ptr(raw->host_addr);

		real->host_addrlen = raw->host_addrlen;

		compat_nfs_string(&real->hostname, &raw->hostname);

		compat_nfs_string(&real->mnt_path, &raw->mnt_path);

		compat_nfs_string(&real->client_addr, &raw->client_addr);

		real->acdirmax = raw->acdirmax;

		real->acdirmin = raw->acdirmin;

		real->acregmax = raw->acregmax;

		real->acregmin = raw->acregmin;

		real->retrans = raw->retrans;

		real->timeo = raw->timeo;

		real->wsize = raw->wsize;

		real->rsize = raw->rsize;

		real->flags = raw->flags;

		real->version = raw->version;

	}



	return 0;

}



#define NFS4_NAME	"nfs4"



COMPAT_SYSCALL_DEFINE5(mount, const char __user *, dev_name,

		       const char __user *, dir_name,

		       const char __user *, type, compat_ulong_t, flags,
@@ -111,14 +44,6 @@ COMPAT_SYSCALL_DEFINE5(mount, const char __user *, dev_name, 
	if (IS_ERR(options))

		goto out2;



	if (kernel_type && options) {

		if (!strcmp(kernel_type, NFS4_NAME)) {

			retval = -EINVAL;

			if (do_nfs4_super_data_conv(options))

				goto out3;

		}

	}



	retval = do_mount(kernel_dev, dir_name, kernel_type, flags, options);



 out3:

fs/nfs/fs_context.c

+62 −0
Original line number Diff line number Diff line
@@ -1037,6 +1037,65 @@ out_invalid_fh: 
}



#if IS_ENABLED(CONFIG_NFS_V4)

struct compat_nfs_string {

	compat_uint_t len;

	compat_uptr_t data;

};



static inline void compat_nfs_string(struct nfs_string *dst,

				     struct compat_nfs_string *src)

{

	dst->data = compat_ptr(src->data);

	dst->len = src->len;

}



struct compat_nfs4_mount_data_v1 {

	compat_int_t version;

	compat_int_t flags;

	compat_int_t rsize;

	compat_int_t wsize;

	compat_int_t timeo;

	compat_int_t retrans;

	compat_int_t acregmin;

	compat_int_t acregmax;

	compat_int_t acdirmin;

	compat_int_t acdirmax;

	struct compat_nfs_string client_addr;

	struct compat_nfs_string mnt_path;

	struct compat_nfs_string hostname;

	compat_uint_t host_addrlen;

	compat_uptr_t host_addr;

	compat_int_t proto;

	compat_int_t auth_flavourlen;

	compat_uptr_t auth_flavours;

};



static void nfs4_compat_mount_data_conv(struct nfs4_mount_data *data)

{

	struct compat_nfs4_mount_data_v1 *compat =

			(struct compat_nfs4_mount_data_v1 *)data;



	/* copy the fields backwards */

	data->auth_flavours = compat_ptr(compat->auth_flavours);

	data->auth_flavourlen = compat->auth_flavourlen;

	data->proto = compat->proto;

	data->host_addr = compat_ptr(compat->host_addr);

	data->host_addrlen = compat->host_addrlen;

	compat_nfs_string(&data->hostname, &compat->hostname);

	compat_nfs_string(&data->mnt_path, &compat->mnt_path);

	compat_nfs_string(&data->client_addr, &compat->client_addr);

	data->acdirmax = compat->acdirmax;

	data->acdirmin = compat->acdirmin;

	data->acregmax = compat->acregmax;

	data->acregmin = compat->acregmin;

	data->retrans = compat->retrans;

	data->timeo = compat->timeo;

	data->wsize = compat->wsize;

	data->rsize = compat->rsize;

	data->flags = compat->flags;

	data->version = compat->version;

}



/*

 * Validate NFSv4 mount options

 */
@@ -1059,6 +1118,9 @@ static int nfs4_parse_monolithic(struct fs_context *fc, 
	if (data->version != 1)

		return generic_parse_monolithic(fc, data);



	if (in_compat_syscall())

		nfs4_compat_mount_data_conv(data);



	if (data->host_addrlen > sizeof(ctx->nfs_server.address))

		goto out_no_address;

	if (data->host_addrlen == 0)

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