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alistair23-linux/fs/ncpfs/ncplib_kernel.c
Petr Vandrovec 2e54eb96e2 BKL: Remove BKL from ncpfs 
Dozen of changes in ncpfs to provide some locking other than BKL.

In readdir cache unlock and mark complete first page as last operation,
so it can be used for synchronization, as code intended.

When updating dentry name on case insensitive filesystems do at least
some basic locking...

Hold i_mutex when updating inode fields.

Push some ncp_conn_is_valid down to ncp_request.  Connection can become
invalid at any moment, and fewer error code paths to test the better.

Use i_size_{read,write} to modify file size.

Set inode's backing_dev_info as ncpfs has its own special bdi.

In ioctl unbreak ioctls invoked on filesystem mounted 'ro' - tests are
for inode writeable or owner match, but were turned to filesystem
writeable and inode writeable or owner match.  Also collect all permission
checks in single place.

Add some locking, and remove comments saying that it would be cool to
add some locks to the code.

Constify some pointers.

Signed-off-by: Petr Vandrovec <petr@vandrovec.name>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2010-10-04 21:10:52 +02:00

1324 lines
32 KiB
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/*
* ncplib_kernel.c
*
* Copyright (C) 1995, 1996 by Volker Lendecke
* Modified for big endian by J.F. Chadima and David S. Miller
* Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
* Modified 1999 Wolfram Pienkoss for NLS
* Modified 2000 Ben Harris, University of Cambridge for NFS NS meta-info
*
*/
#include "ncplib_kernel.h"
static inline void assert_server_locked(struct ncp_server *server)
{
if (server->lock == 0) {
DPRINTK("ncpfs: server not locked!\n");
}
}
static void ncp_add_byte(struct ncp_server *server, __u8 x)
{
assert_server_locked(server);
*(__u8 *) (&(server->packet[server->current_size])) = x;
server->current_size += 1;
return;
}
static void ncp_add_word(struct ncp_server *server, __le16 x)
{
assert_server_locked(server);
put_unaligned(x, (__le16 *) (&(server->packet[server->current_size])));
server->current_size += 2;
return;
}
static void ncp_add_be16(struct ncp_server *server, __u16 x)
{
assert_server_locked(server);
put_unaligned(cpu_to_be16(x), (__be16 *) (&(server->packet[server->current_size])));
server->current_size += 2;
}
static void ncp_add_dword(struct ncp_server *server, __le32 x)
{
assert_server_locked(server);
put_unaligned(x, (__le32 *) (&(server->packet[server->current_size])));
server->current_size += 4;
return;
}
static void ncp_add_be32(struct ncp_server *server, __u32 x)
{
assert_server_locked(server);
put_unaligned(cpu_to_be32(x), (__be32 *)(&(server->packet[server->current_size])));
server->current_size += 4;
}
static inline void ncp_add_dword_lh(struct ncp_server *server, __u32 x) {
ncp_add_dword(server, cpu_to_le32(x));
}
static void ncp_add_mem(struct ncp_server *server, const void *source, int size)
{
assert_server_locked(server);
memcpy(&(server->packet[server->current_size]), source, size);
server->current_size += size;
return;
}
static void ncp_add_pstring(struct ncp_server *server, const char *s)
{
int len = strlen(s);
assert_server_locked(server);
if (len > 255) {
DPRINTK("ncpfs: string too long: %s\n", s);
len = 255;
}
ncp_add_byte(server, len);
ncp_add_mem(server, s, len);
return;
}
static inline void ncp_init_request(struct ncp_server *server)
{
ncp_lock_server(server);
server->current_size = sizeof(struct ncp_request_header);
server->has_subfunction = 0;
}
static inline void ncp_init_request_s(struct ncp_server *server, int subfunction)
{
ncp_lock_server(server);
server->current_size = sizeof(struct ncp_request_header) + 2;
ncp_add_byte(server, subfunction);
server->has_subfunction = 1;
}
static inline char *
ncp_reply_data(struct ncp_server *server, int offset)
{
return &(server->packet[sizeof(struct ncp_reply_header) + offset]);
}
static inline u8 BVAL(const void *data)
{
return *(const u8 *)data;
}
static u8 ncp_reply_byte(struct ncp_server *server, int offset)
{
return *(const u8 *)ncp_reply_data(server, offset);
}
static inline u16 WVAL_LH(const void *data)
{
return get_unaligned_le16(data);
}
static u16
ncp_reply_le16(struct ncp_server *server, int offset)
{
return get_unaligned_le16(ncp_reply_data(server, offset));
}
static u16
ncp_reply_be16(struct ncp_server *server, int offset)
{
return get_unaligned_be16(ncp_reply_data(server, offset));
}
static inline u32 DVAL_LH(const void *data)
{
return get_unaligned_le32(data);
}
static __le32
ncp_reply_dword(struct ncp_server *server, int offset)
{
return get_unaligned((__le32 *)ncp_reply_data(server, offset));
}
static inline __u32 ncp_reply_dword_lh(struct ncp_server* server, int offset) {
return le32_to_cpu(ncp_reply_dword(server, offset));
}
int
ncp_negotiate_buffersize(struct ncp_server *server, int size, int *target)
{
int result;
ncp_init_request(server);
ncp_add_be16(server, size);
if ((result = ncp_request(server, 33)) != 0) {
ncp_unlock_server(server);
return result;
}
*target = min_t(unsigned int, ncp_reply_be16(server, 0), size);
ncp_unlock_server(server);
return 0;
}
/* options:
* bit 0 ipx checksum
* bit 1 packet signing
*/
int
ncp_negotiate_size_and_options(struct ncp_server *server,
int size, int options, int *ret_size, int *ret_options) {
int result;
/* there is minimum */
if (size < NCP_BLOCK_SIZE) size = NCP_BLOCK_SIZE;
ncp_init_request(server);
ncp_add_be16(server, size);
ncp_add_byte(server, options);
if ((result = ncp_request(server, 0x61)) != 0)
{
ncp_unlock_server(server);
return result;
}
/* NCP over UDP returns 0 (!!!) */
result = ncp_reply_be16(server, 0);
if (result >= NCP_BLOCK_SIZE)
size = min(result, size);
*ret_size = size;
*ret_options = ncp_reply_byte(server, 4);
ncp_unlock_server(server);
return 0;
}
int ncp_get_volume_info_with_number(struct ncp_server* server,
int n, struct ncp_volume_info* target) {
int result;
int len;
ncp_init_request_s(server, 44);
ncp_add_byte(server, n);
if ((result = ncp_request(server, 22)) != 0) {
goto out;
}
target->total_blocks = ncp_reply_dword_lh(server, 0);
target->free_blocks = ncp_reply_dword_lh(server, 4);
target->purgeable_blocks = ncp_reply_dword_lh(server, 8);
target->not_yet_purgeable_blocks = ncp_reply_dword_lh(server, 12);
target->total_dir_entries = ncp_reply_dword_lh(server, 16);
target->available_dir_entries = ncp_reply_dword_lh(server, 20);
target->sectors_per_block = ncp_reply_byte(server, 28);
memset(&(target->volume_name), 0, sizeof(target->volume_name));
result = -EIO;
len = ncp_reply_byte(server, 29);
if (len > NCP_VOLNAME_LEN) {
DPRINTK("ncpfs: volume name too long: %d\n", len);
goto out;
}
memcpy(&(target->volume_name), ncp_reply_data(server, 30), len);
result = 0;
out:
ncp_unlock_server(server);
return result;
}
int ncp_get_directory_info(struct ncp_server* server, __u8 n,
struct ncp_volume_info* target) {
int result;
int len;
ncp_init_request_s(server, 45);
ncp_add_byte(server, n);
if ((result = ncp_request(server, 22)) != 0) {
goto out;
}
target->total_blocks = ncp_reply_dword_lh(server, 0);
target->free_blocks = ncp_reply_dword_lh(server, 4);
target->purgeable_blocks = 0;
target->not_yet_purgeable_blocks = 0;
target->total_dir_entries = ncp_reply_dword_lh(server, 8);
target->available_dir_entries = ncp_reply_dword_lh(server, 12);
target->sectors_per_block = ncp_reply_byte(server, 20);
memset(&(target->volume_name), 0, sizeof(target->volume_name));
result = -EIO;
len = ncp_reply_byte(server, 21);
if (len > NCP_VOLNAME_LEN) {
DPRINTK("ncpfs: volume name too long: %d\n", len);
goto out;
}
memcpy(&(target->volume_name), ncp_reply_data(server, 22), len);
result = 0;
out:
ncp_unlock_server(server);
return result;
}
int
ncp_close_file(struct ncp_server *server, const char *file_id)
{
int result;
ncp_init_request(server);
ncp_add_byte(server, 0);
ncp_add_mem(server, file_id, 6);
result = ncp_request(server, 66);
ncp_unlock_server(server);
return result;
}
int
ncp_make_closed(struct inode *inode)
{
int err;
err = 0;
mutex_lock(&NCP_FINFO(inode)->open_mutex);
if (atomic_read(&NCP_FINFO(inode)->opened) == 1) {
atomic_set(&NCP_FINFO(inode)->opened, 0);
err = ncp_close_file(NCP_SERVER(inode), NCP_FINFO(inode)->file_handle);
if (!err)
PPRINTK("ncp_make_closed: volnum=%d, dirent=%u, error=%d\n",
NCP_FINFO(inode)->volNumber,
NCP_FINFO(inode)->dirEntNum, err);
}
mutex_unlock(&NCP_FINFO(inode)->open_mutex);
return err;
}
static void ncp_add_handle_path(struct ncp_server *server, __u8 vol_num,
__le32 dir_base, int have_dir_base,
const char *path)
{
ncp_add_byte(server, vol_num);
ncp_add_dword(server, dir_base);
if (have_dir_base != 0) {
ncp_add_byte(server, 1); /* dir_base */
} else {
ncp_add_byte(server, 0xff); /* no handle */
}
if (path != NULL) {
ncp_add_byte(server, 1); /* 1 component */
ncp_add_pstring(server, path);
} else {
ncp_add_byte(server, 0);
}
}
int ncp_dirhandle_alloc(struct ncp_server* server, __u8 volnum, __le32 dirent,
__u8* dirhandle) {
int result;
ncp_init_request(server);
ncp_add_byte(server, 12); /* subfunction */
ncp_add_byte(server, NW_NS_DOS);
ncp_add_byte(server, 0);
ncp_add_word(server, 0);
ncp_add_handle_path(server, volnum, dirent, 1, NULL);
if ((result = ncp_request(server, 87)) == 0) {
*dirhandle = ncp_reply_byte(server, 0);
}
ncp_unlock_server(server);
return result;
}
int ncp_dirhandle_free(struct ncp_server* server, __u8 dirhandle) {
int result;
ncp_init_request_s(server, 20);
ncp_add_byte(server, dirhandle);
result = ncp_request(server, 22);
ncp_unlock_server(server);
return result;
}
void ncp_extract_file_info(const void *structure, struct nw_info_struct *target)
{
const __u8 *name_len;
const int info_struct_size = offsetof(struct nw_info_struct, nameLen);
memcpy(target, structure, info_struct_size);
name_len = structure + info_struct_size;
target->nameLen = *name_len;
memcpy(target->entryName, name_len + 1, *name_len);
target->entryName[*name_len] = '\0';
target->volNumber = le32_to_cpu(target->volNumber);
return;
}
#ifdef CONFIG_NCPFS_NFS_NS
static inline void ncp_extract_nfs_info(const unsigned char *structure,
struct nw_nfs_info *target)
{
target->mode = DVAL_LH(structure);
target->rdev = DVAL_LH(structure + 8);
}
#endif
int ncp_obtain_nfs_info(struct ncp_server *server,
struct nw_info_struct *target)
{
int result = 0;
#ifdef CONFIG_NCPFS_NFS_NS
__u32 volnum = target->volNumber;
if (ncp_is_nfs_extras(server, volnum)) {
ncp_init_request(server);
ncp_add_byte(server, 19); /* subfunction */
ncp_add_byte(server, server->name_space[volnum]);
ncp_add_byte(server, NW_NS_NFS);
ncp_add_byte(server, 0);
ncp_add_byte(server, volnum);
ncp_add_dword(server, target->dirEntNum);
/* We must retrieve both nlinks and rdev, otherwise some server versions
report zeroes instead of valid data */
ncp_add_dword_lh(server, NSIBM_NFS_MODE | NSIBM_NFS_NLINKS | NSIBM_NFS_RDEV);
if ((result = ncp_request(server, 87)) == 0) {
ncp_extract_nfs_info(ncp_reply_data(server, 0), &target->nfs);
DPRINTK(KERN_DEBUG
"ncp_obtain_nfs_info: (%s) mode=0%o, rdev=0x%x\n",
target->entryName, target->nfs.mode,
target->nfs.rdev);
} else {
target->nfs.mode = 0;
target->nfs.rdev = 0;
}
ncp_unlock_server(server);
} else
#endif
{
target->nfs.mode = 0;
target->nfs.rdev = 0;
}
return result;
}
/*
* Returns information for a (one-component) name relative to
* the specified directory.
*/
int ncp_obtain_info(struct ncp_server *server, struct inode *dir, const char *path,
struct nw_info_struct *target)
{
__u8 volnum = NCP_FINFO(dir)->volNumber;
__le32 dirent = NCP_FINFO(dir)->dirEntNum;
int result;
if (target == NULL) {
printk(KERN_ERR "ncp_obtain_info: invalid call\n");
return -EINVAL;
}
ncp_init_request(server);
ncp_add_byte(server, 6); /* subfunction */
ncp_add_byte(server, server->name_space[volnum]);
ncp_add_byte(server, server->name_space[volnum]); /* N.B. twice ?? */
ncp_add_word(server, cpu_to_le16(0x8006)); /* get all */
ncp_add_dword(server, RIM_ALL);
ncp_add_handle_path(server, volnum, dirent, 1, path);
if ((result = ncp_request(server, 87)) != 0)
goto out;
ncp_extract_file_info(ncp_reply_data(server, 0), target);
ncp_unlock_server(server);
result = ncp_obtain_nfs_info(server, target);
return result;
out:
ncp_unlock_server(server);
return result;
}
#ifdef CONFIG_NCPFS_NFS_NS
static int
ncp_obtain_DOS_dir_base(struct ncp_server *server,
__u8 ns, __u8 volnum, __le32 dirent,
const char *path, /* At most 1 component */
__le32 *DOS_dir_base)
{
int result;
ncp_init_request(server);
ncp_add_byte(server, 6); /* subfunction */
ncp_add_byte(server, ns);
ncp_add_byte(server, ns);
ncp_add_word(server, cpu_to_le16(0x8006)); /* get all */
ncp_add_dword(server, RIM_DIRECTORY);
ncp_add_handle_path(server, volnum, dirent, 1, path);
if ((result = ncp_request(server, 87)) == 0)
{
if (DOS_dir_base) *DOS_dir_base=ncp_reply_dword(server, 0x34);
}
ncp_unlock_server(server);
return result;
}
#endif /* CONFIG_NCPFS_NFS_NS */
static inline int
ncp_get_known_namespace(struct ncp_server *server, __u8 volume)
{
#if defined(CONFIG_NCPFS_OS2_NS) || defined(CONFIG_NCPFS_NFS_NS)
int result;
__u8 *namespace;
__u16 no_namespaces;
ncp_init_request(server);
ncp_add_byte(server, 24); /* Subfunction: Get Name Spaces Loaded */
ncp_add_word(server, 0);
ncp_add_byte(server, volume);
if ((result = ncp_request(server, 87)) != 0) {
ncp_unlock_server(server);
return NW_NS_DOS; /* not result ?? */
}
result = NW_NS_DOS;
no_namespaces = ncp_reply_le16(server, 0);
namespace = ncp_reply_data(server, 2);
while (no_namespaces > 0) {
DPRINTK("get_namespaces: found %d on %d\n", *namespace, volume);
#ifdef CONFIG_NCPFS_NFS_NS
if ((*namespace == NW_NS_NFS) && !(server->m.flags&NCP_MOUNT_NO_NFS))
{
result = NW_NS_NFS;
break;
}
#endif /* CONFIG_NCPFS_NFS_NS */
#ifdef CONFIG_NCPFS_OS2_NS
if ((*namespace == NW_NS_OS2) && !(server->m.flags&NCP_MOUNT_NO_OS2))
{
result = NW_NS_OS2;
}
#endif /* CONFIG_NCPFS_OS2_NS */
namespace += 1;
no_namespaces -= 1;
}
ncp_unlock_server(server);
return result;
#else /* neither OS2 nor NFS - only DOS */
return NW_NS_DOS;
#endif /* defined(CONFIG_NCPFS_OS2_NS) || defined(CONFIG_NCPFS_NFS_NS) */
}
int
ncp_update_known_namespace(struct ncp_server *server, __u8 volume, int *ret_ns)
{
int ns = ncp_get_known_namespace(server, volume);
if (ret_ns)
*ret_ns = ns;
DPRINTK("lookup_vol: namespace[%d] = %d\n",
volume, server->name_space[volume]);
if (server->name_space[volume] == ns)
return 0;
server->name_space[volume] = ns;
return 1;
}
static int
ncp_ObtainSpecificDirBase(struct ncp_server *server,
__u8 nsSrc, __u8 nsDst, __u8 vol_num, __le32 dir_base,
const char *path, /* At most 1 component */
__le32 *dirEntNum, __le32 *DosDirNum)
{
int result;
ncp_init_request(server);
ncp_add_byte(server, 6); /* subfunction */
ncp_add_byte(server, nsSrc);
ncp_add_byte(server, nsDst);
ncp_add_word(server, cpu_to_le16(0x8006)); /* get all */
ncp_add_dword(server, RIM_ALL);
ncp_add_handle_path(server, vol_num, dir_base, 1, path);
if ((result = ncp_request(server, 87)) != 0)
{
ncp_unlock_server(server);
return result;
}
if (dirEntNum)
*dirEntNum = ncp_reply_dword(server, 0x30);
if (DosDirNum)
*DosDirNum = ncp_reply_dword(server, 0x34);
ncp_unlock_server(server);
return 0;
}
int
ncp_mount_subdir(struct ncp_server *server,
__u8 volNumber, __u8 srcNS, __le32 dirEntNum,
__u32* volume, __le32* newDirEnt, __le32* newDosEnt)
{
int dstNS;
int result;
ncp_update_known_namespace(server, volNumber, &dstNS);
if ((result = ncp_ObtainSpecificDirBase(server, srcNS, dstNS, volNumber,
dirEntNum, NULL, newDirEnt, newDosEnt)) != 0)
{
return result;
}
*volume = volNumber;
server->m.mounted_vol[1] = 0;
server->m.mounted_vol[0] = 'X';
return 0;
}
int
ncp_get_volume_root(struct ncp_server *server,
const char *volname, __u32* volume, __le32* dirent, __le32* dosdirent)
{
int result;
DPRINTK("ncp_get_volume_root: looking up vol %s\n", volname);
ncp_init_request(server);
ncp_add_byte(server, 22); /* Subfunction: Generate dir handle */
ncp_add_byte(server, 0); /* DOS namespace */
ncp_add_byte(server, 0); /* reserved */
ncp_add_byte(server, 0); /* reserved */
ncp_add_byte(server, 0); /* reserved */
ncp_add_byte(server, 0); /* faked volume number */
ncp_add_dword(server, 0); /* faked dir_base */
ncp_add_byte(server, 0xff); /* Don't have a dir_base */
ncp_add_byte(server, 1); /* 1 path component */
ncp_add_pstring(server, volname);
if ((result = ncp_request(server, 87)) != 0) {
ncp_unlock_server(server);
return result;
}
*dirent = *dosdirent = ncp_reply_dword(server, 4);
*volume = ncp_reply_byte(server, 8);
ncp_unlock_server(server);
return 0;
}
int
ncp_lookup_volume(struct ncp_server *server,
const char *volname, struct nw_info_struct *target)
{
int result;
memset(target, 0, sizeof(*target));
result = ncp_get_volume_root(server, volname,
&target->volNumber, &target->dirEntNum, &target->DosDirNum);
if (result) {
return result;
}
ncp_update_known_namespace(server, target->volNumber, NULL);
target->nameLen = strlen(volname);
memcpy(target->entryName, volname, target->nameLen+1);
target->attributes = aDIR;
/* set dates to Jan 1, 1986 00:00 */
target->creationTime = target->modifyTime = cpu_to_le16(0x0000);
target->creationDate = target->modifyDate = target->lastAccessDate = cpu_to_le16(0x0C21);
target->nfs.mode = 0;
return 0;
}
int ncp_modify_file_or_subdir_dos_info_path(struct ncp_server *server,
struct inode *dir,
const char *path,
__le32 info_mask,
const struct nw_modify_dos_info *info)
{
__u8 volnum = NCP_FINFO(dir)->volNumber;
__le32 dirent = NCP_FINFO(dir)->dirEntNum;
int result;
ncp_init_request(server);
ncp_add_byte(server, 7); /* subfunction */
ncp_add_byte(server, server->name_space[volnum]);
ncp_add_byte(server, 0); /* reserved */
ncp_add_word(server, cpu_to_le16(0x8006)); /* search attribs: all */
ncp_add_dword(server, info_mask);
ncp_add_mem(server, info, sizeof(*info));
ncp_add_handle_path(server, volnum, dirent, 1, path);
result = ncp_request(server, 87);
ncp_unlock_server(server);
return result;
}
int ncp_modify_file_or_subdir_dos_info(struct ncp_server *server,
struct inode *dir,
__le32 info_mask,
const struct nw_modify_dos_info *info)
{
return ncp_modify_file_or_subdir_dos_info_path(server, dir, NULL,
info_mask, info);
}
#ifdef CONFIG_NCPFS_NFS_NS
int ncp_modify_nfs_info(struct ncp_server *server, __u8 volnum, __le32 dirent,
__u32 mode, __u32 rdev)
{
int result = 0;
ncp_init_request(server);
if (server->name_space[volnum] == NW_NS_NFS) {
ncp_add_byte(server, 25); /* subfunction */
ncp_add_byte(server, server->name_space[volnum]);
ncp_add_byte(server, NW_NS_NFS);
ncp_add_byte(server, volnum);
ncp_add_dword(server, dirent);
/* we must always operate on both nlinks and rdev, otherwise
rdev is not set */
ncp_add_dword_lh(server, NSIBM_NFS_MODE | NSIBM_NFS_NLINKS | NSIBM_NFS_RDEV);
ncp_add_dword_lh(server, mode);
ncp_add_dword_lh(server, 1); /* nlinks */
ncp_add_dword_lh(server, rdev);
result = ncp_request(server, 87);
}
ncp_unlock_server(server);
return result;
}
#endif
static int
ncp_DeleteNSEntry(struct ncp_server *server,
__u8 have_dir_base, __u8 volnum, __le32 dirent,
const char* name, __u8 ns, __le16 attr)
{
int result;
ncp_init_request(server);
ncp_add_byte(server, 8); /* subfunction */
ncp_add_byte(server, ns);
ncp_add_byte(server, 0); /* reserved */
ncp_add_word(server, attr); /* search attribs: all */
ncp_add_handle_path(server, volnum, dirent, have_dir_base, name);
result = ncp_request(server, 87);
ncp_unlock_server(server);
return result;
}
int
ncp_del_file_or_subdir2(struct ncp_server *server,
struct dentry *dentry)
{
struct inode *inode = dentry->d_inode;
__u8 volnum;
__le32 dirent;
if (!inode) {
return 0xFF; /* Any error */
}
volnum = NCP_FINFO(inode)->volNumber;
dirent = NCP_FINFO(inode)->DosDirNum;
return ncp_DeleteNSEntry(server, 1, volnum, dirent, NULL, NW_NS_DOS, cpu_to_le16(0x8006));
}
int
ncp_del_file_or_subdir(struct ncp_server *server,
struct inode *dir, const char *name)
{
__u8 volnum = NCP_FINFO(dir)->volNumber;
__le32 dirent = NCP_FINFO(dir)->dirEntNum;
int name_space;
name_space = server->name_space[volnum];
#ifdef CONFIG_NCPFS_NFS_NS
if (name_space == NW_NS_NFS)
{
int result;
result=ncp_obtain_DOS_dir_base(server, name_space, volnum, dirent, name, &dirent);
if (result) return result;
name = NULL;
name_space = NW_NS_DOS;
}
#endif /* CONFIG_NCPFS_NFS_NS */
return ncp_DeleteNSEntry(server, 1, volnum, dirent, name, name_space, cpu_to_le16(0x8006));
}
static inline void ConvertToNWfromDWORD(__u16 v0, __u16 v1, __u8 ret[6])
{
__le16 *dest = (__le16 *) ret;
dest[1] = cpu_to_le16(v0);
dest[2] = cpu_to_le16(v1);
dest[0] = cpu_to_le16(v0 + 1);
return;
}
/* If both dir and name are NULL, then in target there's already a
looked-up entry that wants to be opened. */
int ncp_open_create_file_or_subdir(struct ncp_server *server,
struct inode *dir, const char *name,
int open_create_mode,
__le32 create_attributes,
__le16 desired_acc_rights,
struct ncp_entry_info *target)
{
__le16 search_attribs = cpu_to_le16(0x0006);
__u8 volnum;
__le32 dirent;
int result;
volnum = NCP_FINFO(dir)->volNumber;
dirent = NCP_FINFO(dir)->dirEntNum;
if ((create_attributes & aDIR) != 0) {
search_attribs |= cpu_to_le16(0x8000);
}
ncp_init_request(server);
ncp_add_byte(server, 1); /* subfunction */
ncp_add_byte(server, server->name_space[volnum]);
ncp_add_byte(server, open_create_mode);
ncp_add_word(server, search_attribs);
ncp_add_dword(server, RIM_ALL);
ncp_add_dword(server, create_attributes);
/* The desired acc rights seem to be the inherited rights mask
for directories */
ncp_add_word(server, desired_acc_rights);
ncp_add_handle_path(server, volnum, dirent, 1, name);
if ((result = ncp_request(server, 87)) != 0)
goto out;
if (!(create_attributes & aDIR))
target->opened = 1;
/* in target there's a new finfo to fill */
ncp_extract_file_info(ncp_reply_data(server, 6), &(target->i));
target->volume = target->i.volNumber;
ConvertToNWfromDWORD(ncp_reply_le16(server, 0),
ncp_reply_le16(server, 2),
target->file_handle);
ncp_unlock_server(server);
(void)ncp_obtain_nfs_info(server, &(target->i));
return 0;
out:
ncp_unlock_server(server);
return result;
}
int
ncp_initialize_search(struct ncp_server *server, struct inode *dir,
struct nw_search_sequence *target)
{
__u8 volnum = NCP_FINFO(dir)->volNumber;
__le32 dirent = NCP_FINFO(dir)->dirEntNum;
int result;
ncp_init_request(server);
ncp_add_byte(server, 2); /* subfunction */
ncp_add_byte(server, server->name_space[volnum]);
ncp_add_byte(server, 0); /* reserved */
ncp_add_handle_path(server, volnum, dirent, 1, NULL);
result = ncp_request(server, 87);
if (result)
goto out;
memcpy(target, ncp_reply_data(server, 0), sizeof(*target));
out:
ncp_unlock_server(server);
return result;
}
int ncp_search_for_fileset(struct ncp_server *server,
struct nw_search_sequence *seq,
int* more,
int* cnt,
char* buffer,
size_t bufsize,
char** rbuf,
size_t* rsize)
{
int result;
ncp_init_request(server);
ncp_add_byte(server, 20);
ncp_add_byte(server, server->name_space[seq->volNumber]);
ncp_add_byte(server, 0); /* datastream */
ncp_add_word(server, cpu_to_le16(0x8006));
ncp_add_dword(server, RIM_ALL);
ncp_add_word(server, cpu_to_le16(32767)); /* max returned items */
ncp_add_mem(server, seq, 9);
#ifdef CONFIG_NCPFS_NFS_NS
if (server->name_space[seq->volNumber] == NW_NS_NFS) {
ncp_add_byte(server, 0); /* 0 byte pattern */
} else
#endif
{
ncp_add_byte(server, 2); /* 2 byte pattern */
ncp_add_byte(server, 0xff); /* following is a wildcard */
ncp_add_byte(server, '*');
}
result = ncp_request2(server, 87, buffer, bufsize);
if (result) {
ncp_unlock_server(server);
return result;
}
if (server->ncp_reply_size < 12) {
ncp_unlock_server(server);
return 0xFF;
}
*rsize = server->ncp_reply_size - 12;
ncp_unlock_server(server);
buffer = buffer + sizeof(struct ncp_reply_header);
*rbuf = buffer + 12;
*cnt = WVAL_LH(buffer + 10);
*more = BVAL(buffer + 9);
memcpy(seq, buffer, 9);
return 0;
}
static int
ncp_RenameNSEntry(struct ncp_server *server,
struct inode *old_dir, const char *old_name, __le16 old_type,
struct inode *new_dir, const char *new_name)
{
int result = -EINVAL;
if ((old_dir == NULL) || (old_name == NULL) ||
(new_dir == NULL) || (new_name == NULL))
goto out;
ncp_init_request(server);
ncp_add_byte(server, 4); /* subfunction */
ncp_add_byte(server, server->name_space[NCP_FINFO(old_dir)->volNumber]);
ncp_add_byte(server, 1); /* rename flag */
ncp_add_word(server, old_type); /* search attributes */
/* source Handle Path */
ncp_add_byte(server, NCP_FINFO(old_dir)->volNumber);
ncp_add_dword(server, NCP_FINFO(old_dir)->dirEntNum);
ncp_add_byte(server, 1);
ncp_add_byte(server, 1); /* 1 source component */
/* dest Handle Path */
ncp_add_byte(server, NCP_FINFO(new_dir)->volNumber);
ncp_add_dword(server, NCP_FINFO(new_dir)->dirEntNum);
ncp_add_byte(server, 1);
ncp_add_byte(server, 1); /* 1 destination component */
/* source path string */
ncp_add_pstring(server, old_name);
/* dest path string */
ncp_add_pstring(server, new_name);
result = ncp_request(server, 87);
ncp_unlock_server(server);
out:
return result;
}
int ncp_ren_or_mov_file_or_subdir(struct ncp_server *server,
struct inode *old_dir, const char *old_name,
struct inode *new_dir, const char *new_name)
{
int result;
__le16 old_type = cpu_to_le16(0x06);
/* If somebody can do it atomic, call me... vandrove@vc.cvut.cz */
result = ncp_RenameNSEntry(server, old_dir, old_name, old_type,
new_dir, new_name);
if (result == 0xFF) /* File Not Found, try directory */
{
old_type = cpu_to_le16(0x16);
result = ncp_RenameNSEntry(server, old_dir, old_name, old_type,
new_dir, new_name);
}
if (result != 0x92) return result; /* All except NO_FILES_RENAMED */
result = ncp_del_file_or_subdir(server, new_dir, new_name);
if (result != 0) return -EACCES;
result = ncp_RenameNSEntry(server, old_dir, old_name, old_type,
new_dir, new_name);
return result;
}
/* We have to transfer to/from user space */
int
ncp_read_kernel(struct ncp_server *server, const char *file_id,
__u32 offset, __u16 to_read, char *target, int *bytes_read)
{
const char *source;
int result;
ncp_init_request(server);
ncp_add_byte(server, 0);
ncp_add_mem(server, file_id, 6);
ncp_add_be32(server, offset);
ncp_add_be16(server, to_read);
if ((result = ncp_request(server, 72)) != 0) {
goto out;
}
*bytes_read = ncp_reply_be16(server, 0);
source = ncp_reply_data(server, 2 + (offset & 1));
memcpy(target, source, *bytes_read);
out:
ncp_unlock_server(server);
return result;
}
/* There is a problem... egrep and some other silly tools do:
x = mmap(NULL, MAP_PRIVATE, PROT_READ|PROT_WRITE, <ncpfs fd>, 32768);
read(<ncpfs fd>, x, 32768);
Now copying read result by copy_to_user causes pagefault. This pagefault
could not be handled because of server was locked due to read. So we have
to use temporary buffer. So ncp_unlock_server must be done before
copy_to_user (and for write, copy_from_user must be done before
ncp_init_request... same applies for send raw packet ioctl). Because of
file is normally read in bigger chunks, caller provides kmalloced
(vmalloced) chunk of memory with size >= to_read...
*/
int
ncp_read_bounce(struct ncp_server *server, const char *file_id,
__u32 offset, __u16 to_read, char __user *target, int *bytes_read,
void* bounce, __u32 bufsize)
{
int result;
ncp_init_request(server);
ncp_add_byte(server, 0);
ncp_add_mem(server, file_id, 6);
ncp_add_be32(server, offset);
ncp_add_be16(server, to_read);
result = ncp_request2(server, 72, bounce, bufsize);
ncp_unlock_server(server);
if (!result) {
int len = get_unaligned_be16((char *)bounce +
sizeof(struct ncp_reply_header));
result = -EIO;
if (len <= to_read) {
char* source;
source = (char*)bounce +
sizeof(struct ncp_reply_header) + 2 +
(offset & 1);
*bytes_read = len;
result = 0;
if (copy_to_user(target, source, len))
result = -EFAULT;
}
}
return result;
}
int
ncp_write_kernel(struct ncp_server *server, const char *file_id,
__u32 offset, __u16 to_write,
const char *source, int *bytes_written)
{
int result;
ncp_init_request(server);
ncp_add_byte(server, 0);
ncp_add_mem(server, file_id, 6);
ncp_add_be32(server, offset);
ncp_add_be16(server, to_write);
ncp_add_mem(server, source, to_write);
if ((result = ncp_request(server, 73)) == 0)
*bytes_written = to_write;
ncp_unlock_server(server);
return result;
}
#ifdef CONFIG_NCPFS_IOCTL_LOCKING
int
ncp_LogPhysicalRecord(struct ncp_server *server, const char *file_id,
__u8 locktype, __u32 offset, __u32 length, __u16 timeout)
{
int result;
ncp_init_request(server);
ncp_add_byte(server, locktype);
ncp_add_mem(server, file_id, 6);
ncp_add_be32(server, offset);
ncp_add_be32(server, length);
ncp_add_be16(server, timeout);
if ((result = ncp_request(server, 0x1A)) != 0)
{
ncp_unlock_server(server);
return result;
}
ncp_unlock_server(server);
return 0;
}
int
ncp_ClearPhysicalRecord(struct ncp_server *server, const char *file_id,
__u32 offset, __u32 length)
{
int result;
ncp_init_request(server);
ncp_add_byte(server, 0); /* who knows... lanalyzer says that */
ncp_add_mem(server, file_id, 6);
ncp_add_be32(server, offset);
ncp_add_be32(server, length);
if ((result = ncp_request(server, 0x1E)) != 0)
{
ncp_unlock_server(server);
return result;
}
ncp_unlock_server(server);
return 0;
}
#endif /* CONFIG_NCPFS_IOCTL_LOCKING */
#ifdef CONFIG_NCPFS_NLS
/* This are the NLS conversion routines with inspirations and code parts
* from the vfat file system and hints from Petr Vandrovec.
*/
int
ncp__io2vol(struct ncp_server *server, unsigned char *vname, unsigned int *vlen,
const unsigned char *iname, unsigned int ilen, int cc)
{
struct nls_table *in = server->nls_io;
struct nls_table *out = server->nls_vol;
unsigned char *vname_start;
unsigned char *vname_end;
const unsigned char *iname_end;
iname_end = iname + ilen;
vname_start = vname;
vname_end = vname + *vlen - 1;
while (iname < iname_end) {
int chl;
wchar_t ec;
if (NCP_IS_FLAG(server, NCP_FLAG_UTF8)) {
int k;
unicode_t u;
k = utf8_to_utf32(iname, iname_end - iname, &u);
if (k < 0 || u > MAX_WCHAR_T)
return -EINVAL;
iname += k;
ec = u;
} else {
if (*iname == NCP_ESC) {
int k;
if (iname_end - iname < 5)
goto nospec;
ec = 0;
for (k = 1; k < 5; k++) {
unsigned char nc;
nc = iname[k] - '0';
if (nc >= 10) {
nc -= 'A' - '0' - 10;
if ((nc < 10) || (nc > 15)) {
goto nospec;
}
}
ec = (ec << 4) | nc;
}
iname += 5;
} else {
nospec:;
if ( (chl = in->char2uni(iname, iname_end - iname, &ec)) < 0)
return chl;
iname += chl;
}
}
/* unitoupper should be here! */
chl = out->uni2char(ec, vname, vname_end - vname);
if (chl < 0)
return chl;
/* this is wrong... */
if (cc) {
int chi;
for (chi = 0; chi < chl; chi++){
vname[chi] = ncp_toupper(out, vname[chi]);
}
}
vname += chl;
}
*vname = 0;
*vlen = vname - vname_start;
return 0;
}
int
ncp__vol2io(struct ncp_server *server, unsigned char *iname, unsigned int *ilen,
const unsigned char *vname, unsigned int vlen, int cc)
{
struct nls_table *in = server->nls_vol;
struct nls_table *out = server->nls_io;
const unsigned char *vname_end;
unsigned char *iname_start;
unsigned char *iname_end;
unsigned char *vname_cc;
int err;
vname_cc = NULL;
if (cc) {
int i;
/* this is wrong! */
vname_cc = kmalloc(vlen, GFP_KERNEL);
if (!vname_cc)
return -ENOMEM;
for (i = 0; i < vlen; i++)
vname_cc[i] = ncp_tolower(in, vname[i]);
vname = vname_cc;
}
iname_start = iname;
iname_end = iname + *ilen - 1;
vname_end = vname + vlen;
while (vname < vname_end) {
wchar_t ec;
int chl;
if ( (chl = in->char2uni(vname, vname_end - vname, &ec)) < 0) {
err = chl;
goto quit;
}
vname += chl;
/* unitolower should be here! */
if (NCP_IS_FLAG(server, NCP_FLAG_UTF8)) {
int k;
k = utf32_to_utf8(ec, iname, iname_end - iname);
if (k < 0) {
err = -ENAMETOOLONG;
goto quit;
}
iname += k;
} else {
if ( (chl = out->uni2char(ec, iname, iname_end - iname)) >= 0) {
iname += chl;
} else {
int k;
if (iname_end - iname < 5) {
err = -ENAMETOOLONG;
goto quit;
}
*iname = NCP_ESC;
for (k = 4; k > 0; k--) {
unsigned char v;
v = (ec & 0xF) + '0';
if (v > '9') {
v += 'A' - '9' - 1;
}
iname[k] = v;
ec >>= 4;
}
iname += 5;
}
}
}
*iname = 0;
*ilen = iname - iname_start;
err = 0;
quit:;
if (cc)
kfree(vname_cc);
return err;
}
#else
int
ncp__io2vol(unsigned char *vname, unsigned int *vlen,
const unsigned char *iname, unsigned int ilen, int cc)
{
int i;
if (*vlen <= ilen)
return -ENAMETOOLONG;
if (cc)
for (i = 0; i < ilen; i++) {
*vname = toupper(*iname);
vname++;
iname++;
}
else {
memmove(vname, iname, ilen);
vname += ilen;
}
*vlen = ilen;
*vname = 0;
return 0;
}
int
ncp__vol2io(unsigned char *iname, unsigned int *ilen,
const unsigned char *vname, unsigned int vlen, int cc)
{
int i;
if (*ilen <= vlen)
return -ENAMETOOLONG;
if (cc)
for (i = 0; i < vlen; i++) {
*iname = tolower(*vname);
iname++;
vname++;
}
else {
memmove(iname, vname, vlen);
iname += vlen;
}
*ilen = vlen;
*iname = 0;
return 0;
}
#endif
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