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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: 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 10:22:33 +02:00 committed by Al Viro
parent a1c7dc5d15
commit 67e306c690
2 changed files with 62 additions and 75 deletions
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75
fs/compat.c
View File

@ -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:

62
fs/nfs/fs_context.c
View File

@ -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)