openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity
linux/fs/ncpfs/dir.c

1250 lines
31 KiB
C
Raw Blame History

/*
* dir.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 1998, 1999 Wolfram Pienkoss for NLS
* Modified 1999 Wolfram Pienkoss for directory caching
* Modified 2000 Ben Harris, University of Cambridge for NFS NS meta-info
*
*/
#include <linux/time.h>
#include <linux/errno.h>
#include <linux/stat.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <asm/uaccess.h>
#include <asm/byteorder.h>
#include <linux/smp_lock.h>
#include <linux/ncp_fs.h>
#include "ncplib_kernel.h"
static void ncp_read_volume_list(struct file *, void *, filldir_t,
struct ncp_cache_control *);
static void ncp_do_readdir(struct file *, void *, filldir_t,
struct ncp_cache_control *);
static int ncp_readdir(struct file *, void *, filldir_t);
static int ncp_create(struct inode *, struct dentry *, int, struct nameidata *);
static struct dentry *ncp_lookup(struct inode *, struct dentry *, struct nameidata *);
static int ncp_unlink(struct inode *, struct dentry *);
static int ncp_mkdir(struct inode *, struct dentry *, int);
static int ncp_rmdir(struct inode *, struct dentry *);
static int ncp_rename(struct inode *, struct dentry *,
struct inode *, struct dentry *);
static int ncp_mknod(struct inode * dir, struct dentry *dentry,
int mode, dev_t rdev);
#if defined(CONFIG_NCPFS_EXTRAS) || defined(CONFIG_NCPFS_NFS_NS)
extern int ncp_symlink(struct inode *, struct dentry *, const char *);
#else
#define ncp_symlink NULL
#endif
const struct file_operations ncp_dir_operations =
{
.read = generic_read_dir,
.readdir = ncp_readdir,
.ioctl = ncp_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ncp_compat_ioctl,
#endif
};
const struct inode_operations ncp_dir_inode_operations =
{
.create = ncp_create,
.lookup = ncp_lookup,
.unlink = ncp_unlink,
.symlink = ncp_symlink,
.mkdir = ncp_mkdir,
.rmdir = ncp_rmdir,
.mknod = ncp_mknod,
.rename = ncp_rename,
.setattr = ncp_notify_change,
};
/*
* Dentry operations routines
*/
static int ncp_lookup_validate(struct dentry *, struct nameidata *);
static int ncp_hash_dentry(struct dentry *, struct qstr *);
static int ncp_compare_dentry (struct dentry *, struct qstr *, struct qstr *);
static int ncp_delete_dentry(struct dentry *);
static const struct dentry_operations ncp_dentry_operations =
{
.d_revalidate = ncp_lookup_validate,
.d_hash = ncp_hash_dentry,
.d_compare = ncp_compare_dentry,
.d_delete = ncp_delete_dentry,
};
const struct dentry_operations ncp_root_dentry_operations =
{
.d_hash = ncp_hash_dentry,
.d_compare = ncp_compare_dentry,
.d_delete = ncp_delete_dentry,
};
/*
* Note: leave the hash unchanged if the directory
* is case-sensitive.
*/
static int
ncp_hash_dentry(struct dentry *dentry, struct qstr *this)
{
struct nls_table *t;
unsigned long hash;
int i;
t = NCP_IO_TABLE(dentry);
if (!ncp_case_sensitive(dentry->d_inode)) {
hash = init_name_hash();
for (i=0; i<this->len ; i++)
hash = partial_name_hash(ncp_tolower(t, this->name[i]),
hash);
this->hash = end_name_hash(hash);
}
return 0;
}
static int
ncp_compare_dentry(struct dentry *dentry, struct qstr *a, struct qstr *b)
{
if (a->len != b->len)
return 1;
if (ncp_case_sensitive(dentry->d_inode))
return strncmp(a->name, b->name, a->len);
return ncp_strnicmp(NCP_IO_TABLE(dentry), a->name, b->name, a->len);
}
/*
* This is the callback from dput() when d_count is going to 0.
* We use this to unhash dentries with bad inodes.
* Closing files can be safely postponed until iput() - it's done there anyway.
*/
static int
ncp_delete_dentry(struct dentry * dentry)
{
struct inode *inode = dentry->d_inode;
if (inode) {
if (is_bad_inode(inode))
return 1;
} else
{
/* N.B. Unhash negative dentries? */
}
return 0;
}
static inline int
ncp_single_volume(struct ncp_server *server)
{
return (server->m.mounted_vol[0] != '\0');
}
static inline int ncp_is_server_root(struct inode *inode)
{
return (!ncp_single_volume(NCP_SERVER(inode)) &&
inode == inode->i_sb->s_root->d_inode);
}
/*
* This is the callback when the dcache has a lookup hit.
*/
#ifdef CONFIG_NCPFS_STRONG
/* try to delete a readonly file (NW R bit set) */
static int
ncp_force_unlink(struct inode *dir, struct dentry* dentry)
{
int res=0x9c,res2;
struct nw_modify_dos_info info;
__le32 old_nwattr;
struct inode *inode;
memset(&info, 0, sizeof(info));
/* remove the Read-Only flag on the NW server */
inode = dentry->d_inode;
old_nwattr = NCP_FINFO(inode)->nwattr;
info.attributes = old_nwattr & ~(aRONLY|aDELETEINHIBIT|aRENAMEINHIBIT);
res2 = ncp_modify_file_or_subdir_dos_info_path(NCP_SERVER(inode), inode, NULL, DM_ATTRIBUTES, &info);
if (res2)
goto leave_me;
/* now try again the delete operation */
res = ncp_del_file_or_subdir2(NCP_SERVER(dir), dentry);
if (res) /* delete failed, set R bit again */
{
info.attributes = old_nwattr;
res2 = ncp_modify_file_or_subdir_dos_info_path(NCP_SERVER(inode), inode, NULL, DM_ATTRIBUTES, &info);
if (res2)
goto leave_me;
}
leave_me:
return(res);
}
#endif /* CONFIG_NCPFS_STRONG */
#ifdef CONFIG_NCPFS_STRONG
static int
ncp_force_rename(struct inode *old_dir, struct dentry* old_dentry, char *_old_name,
struct inode *new_dir, struct dentry* new_dentry, char *_new_name)
{
struct nw_modify_dos_info info;
int res=0x90,res2;
struct inode *old_inode = old_dentry->d_inode;
__le32 old_nwattr = NCP_FINFO(old_inode)->nwattr;
__le32 new_nwattr = 0; /* shut compiler warning */
int old_nwattr_changed = 0;
int new_nwattr_changed = 0;
memset(&info, 0, sizeof(info));
/* remove the Read-Only flag on the NW server */
info.attributes = old_nwattr & ~(aRONLY|aRENAMEINHIBIT|aDELETEINHIBIT);
res2 = ncp_modify_file_or_subdir_dos_info_path(NCP_SERVER(old_inode), old_inode, NULL, DM_ATTRIBUTES, &info);
if (!res2)
old_nwattr_changed = 1;
if (new_dentry && new_dentry->d_inode) {
new_nwattr = NCP_FINFO(new_dentry->d_inode)->nwattr;
info.attributes = new_nwattr & ~(aRONLY|aRENAMEINHIBIT|aDELETEINHIBIT);
res2 = ncp_modify_file_or_subdir_dos_info_path(NCP_SERVER(new_dir), new_dir, _new_name, DM_ATTRIBUTES, &info);
if (!res2)
new_nwattr_changed = 1;
}
/* now try again the rename operation */
/* but only if something really happened */
if (new_nwattr_changed || old_nwattr_changed) {
res = ncp_ren_or_mov_file_or_subdir(NCP_SERVER(old_dir),
old_dir, _old_name,
new_dir, _new_name);
}
if (res)
goto leave_me;
/* file was successfully renamed, so:
do not set attributes on old file - it no longer exists
copy attributes from old file to new */
new_nwattr_changed = old_nwattr_changed;
new_nwattr = old_nwattr;
old_nwattr_changed = 0;
leave_me:;
if (old_nwattr_changed) {
info.attributes = old_nwattr;
res2 = ncp_modify_file_or_subdir_dos_info_path(NCP_SERVER(old_inode), old_inode, NULL, DM_ATTRIBUTES, &info);
/* ignore errors */
}
if (new_nwattr_changed) {
info.attributes = new_nwattr;
res2 = ncp_modify_file_or_subdir_dos_info_path(NCP_SERVER(new_dir), new_dir, _new_name, DM_ATTRIBUTES, &info);
/* ignore errors */
}
return(res);
}
#endif /* CONFIG_NCPFS_STRONG */
static int
__ncp_lookup_validate(struct dentry *dentry)
{
struct ncp_server *server;
struct dentry *parent;
struct inode *dir;
struct ncp_entry_info finfo;
int res, val = 0, len;
__u8 __name[NCP_MAXPATHLEN + 1];
parent = dget_parent(dentry);
dir = parent->d_inode;
if (!dentry->d_inode)
goto finished;
server = NCP_SERVER(dir);
if (!ncp_conn_valid(server))
goto finished;
/*
* Inspired by smbfs:
* The default validation is based on dentry age:
* We set the max age at mount time. (But each
* successful server lookup renews the timestamp.)
*/
val = NCP_TEST_AGE(server, dentry);
if (val)
goto finished;
DDPRINTK("ncp_lookup_validate: %s/%s not valid, age=%ld, server lookup\n",
dentry->d_parent->d_name.name, dentry->d_name.name,
NCP_GET_AGE(dentry));
len = sizeof(__name);
if (ncp_is_server_root(dir)) {
res = ncp_io2vol(server, __name, &len, dentry->d_name.name,
dentry->d_name.len, 1);
if (!res)
res = ncp_lookup_volume(server, __name, &(finfo.i));
} else {
res = ncp_io2vol(server, __name, &len, dentry->d_name.name,
dentry->d_name.len, !ncp_preserve_case(dir));
if (!res)
res = ncp_obtain_info(server, dir, __name, &(finfo.i));
}
finfo.volume = finfo.i.volNumber;
DDPRINTK("ncp_lookup_validate: looked for %s/%s, res=%d\n",
dentry->d_parent->d_name.name, __name, res);
/*
* If we didn't find it, or if it has a different dirEntNum to
* what we remember, it's not valid any more.
*/
if (!res) {
if (finfo.i.dirEntNum == NCP_FINFO(dentry->d_inode)->dirEntNum) {
ncp_new_dentry(dentry);
val=1;
} else
DDPRINTK("ncp_lookup_validate: found, but dirEntNum changed\n");
ncp_update_inode2(dentry->d_inode, &finfo);
}
finished:
DDPRINTK("ncp_lookup_validate: result=%d\n", val);
dput(parent);
return val;
}
static int
ncp_lookup_validate(struct dentry * dentry, struct nameidata *nd)
{
int res;
lock_kernel();
res = __ncp_lookup_validate(dentry);
unlock_kernel();
return res;
}
static struct dentry *
ncp_dget_fpos(struct dentry *dentry, struct dentry *parent, unsigned long fpos)
{
struct dentry *dent = dentry;
struct list_head *next;
if (d_validate(dent, parent)) {
if (dent->d_name.len <= NCP_MAXPATHLEN &&
(unsigned long)dent->d_fsdata == fpos) {
if (!dent->d_inode) {
dput(dent);
dent = NULL;
}
return dent;
}
dput(dent);
}
/* If a pointer is invalid, we search the dentry. */
spin_lock(&dcache_lock);
next = parent->d_subdirs.next;
while (next != &parent->d_subdirs) {
dent = list_entry(next, struct dentry, d_u.d_child);
if ((unsigned long)dent->d_fsdata == fpos) {
if (dent->d_inode)
dget_locked(dent);
else
dent = NULL;
spin_unlock(&dcache_lock);
goto out;
}
next = next->next;
}
spin_unlock(&dcache_lock);
return NULL;
out:
return dent;
}
static time_t ncp_obtain_mtime(struct dentry *dentry)
{
struct inode *inode = dentry->d_inode;
struct ncp_server *server = NCP_SERVER(inode);
struct nw_info_struct i;
if (!ncp_conn_valid(server) || ncp_is_server_root(inode))
return 0;
if (ncp_obtain_info(server, inode, NULL, &i))
return 0;
return ncp_date_dos2unix(i.modifyTime, i.modifyDate);
}
static int ncp_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
struct dentry *dentry = filp->f_path.dentry;
struct inode *inode = dentry->d_inode;
struct page *page = NULL;
struct ncp_server *server = NCP_SERVER(inode);
union ncp_dir_cache *cache = NULL;
struct ncp_cache_control ctl;
int result, mtime_valid = 0;
time_t mtime = 0;
lock_kernel();
ctl.page = NULL;
ctl.cache = NULL;
DDPRINTK("ncp_readdir: reading %s/%s, pos=%d\n",
dentry->d_parent->d_name.name, dentry->d_name.name,
(int) filp->f_pos);
result = -EIO;
if (!ncp_conn_valid(server))
goto out;
result = 0;
if (filp->f_pos == 0) {
if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR))
goto out;
filp->f_pos = 1;
}
if (filp->f_pos == 1) {
if (filldir(dirent, "..", 2, 1, parent_ino(dentry), DT_DIR))
goto out;
filp->f_pos = 2;
}
page = grab_cache_page(&inode->i_data, 0);
if (!page)
goto read_really;
ctl.cache = cache = kmap(page);
ctl.head = cache->head;
if (!PageUptodate(page) || !ctl.head.eof)
goto init_cache;
if (filp->f_pos == 2) {
if (jiffies - ctl.head.time >= NCP_MAX_AGE(server))
goto init_cache;
mtime = ncp_obtain_mtime(dentry);
mtime_valid = 1;
if ((!mtime) || (mtime != ctl.head.mtime))
goto init_cache;
}
if (filp->f_pos > ctl.head.end)
goto finished;
ctl.fpos = filp->f_pos + (NCP_DIRCACHE_START - 2);
ctl.ofs = ctl.fpos / NCP_DIRCACHE_SIZE;
ctl.idx = ctl.fpos % NCP_DIRCACHE_SIZE;
for (;;) {
if (ctl.ofs != 0) {
ctl.page = find_lock_page(&inode->i_data, ctl.ofs);
if (!ctl.page)
goto invalid_cache;
ctl.cache = kmap(ctl.page);
if (!PageUptodate(ctl.page))
goto invalid_cache;
}
while (ctl.idx < NCP_DIRCACHE_SIZE) {
struct dentry *dent;
int res;
dent = ncp_dget_fpos(ctl.cache->dentry[ctl.idx],
dentry, filp->f_pos);
if (!dent)
goto invalid_cache;
res = filldir(dirent, dent->d_name.name,
dent->d_name.len, filp->f_pos,
dent->d_inode->i_ino, DT_UNKNOWN);
dput(dent);
if (res)
goto finished;
filp->f_pos += 1;
ctl.idx += 1;
if (filp->f_pos > ctl.head.end)
goto finished;
}
if (ctl.page) {
kunmap(ctl.page);
SetPageUptodate(ctl.page);
unlock_page(ctl.page);
page_cache_release(ctl.page);
ctl.page = NULL;
}
ctl.idx = 0;
ctl.ofs += 1;
}
invalid_cache:
if (ctl.page) {
kunmap(ctl.page);
unlock_page(ctl.page);
page_cache_release(ctl.page);
ctl.page = NULL;
}
ctl.cache = cache;
init_cache:
ncp_invalidate_dircache_entries(dentry);
if (!mtime_valid) {
mtime = ncp_obtain_mtime(dentry);
mtime_valid = 1;
}
ctl.head.mtime = mtime;
ctl.head.time = jiffies;
ctl.head.eof = 0;
ctl.fpos = 2;
ctl.ofs = 0;
ctl.idx = NCP_DIRCACHE_START;
ctl.filled = 0;
ctl.valid = 1;
read_really:
if (ncp_is_server_root(inode)) {
ncp_read_volume_list(filp, dirent, filldir, &ctl);
} else {
ncp_do_readdir(filp, dirent, filldir, &ctl);
}
ctl.head.end = ctl.fpos - 1;
ctl.head.eof = ctl.valid;
finished:
if (page) {
cache->head = ctl.head;
kunmap(page);
SetPageUptodate(page);
unlock_page(page);
page_cache_release(page);
}
if (ctl.page) {
kunmap(ctl.page);
SetPageUptodate(ctl.page);
unlock_page(ctl.page);
page_cache_release(ctl.page);
}
out:
unlock_kernel();
return result;
}
static int
ncp_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
struct ncp_cache_control *ctrl, struct ncp_entry_info *entry)
{
struct dentry *newdent, *dentry = filp->f_path.dentry;
struct inode *newino, *inode = dentry->d_inode;
struct ncp_cache_control ctl = *ctrl;
struct qstr qname;
int valid = 0;
int hashed = 0;
ino_t ino = 0;
__u8 __name[NCP_MAXPATHLEN + 1];
qname.len = sizeof(__name);
if (ncp_vol2io(NCP_SERVER(inode), __name, &qname.len,
entry->i.entryName, entry->i.nameLen,
!ncp_preserve_entry_case(inode, entry->i.NSCreator)))
return 1; /* I'm not sure */
qname.name = __name;
qname.hash = full_name_hash(qname.name, qname.len);
if (dentry->d_op && dentry->d_op->d_hash)
if (dentry->d_op->d_hash(dentry, &qname) != 0)
goto end_advance;
newdent = d_lookup(dentry, &qname);
if (!newdent) {
newdent = d_alloc(dentry, &qname);
if (!newdent)
goto end_advance;
} else {
hashed = 1;
memcpy((char *) newdent->d_name.name, qname.name,
newdent->d_name.len);
}
if (!newdent->d_inode) {
entry->opened = 0;
entry->ino = iunique(inode->i_sb, 2);
newino = ncp_iget(inode->i_sb, entry);
if (newino) {
newdent->d_op = &ncp_dentry_operations;
d_instantiate(newdent, newino);
if (!hashed)
d_rehash(newdent);
}
} else
ncp_update_inode2(newdent->d_inode, entry);
if (newdent->d_inode) {
ino = newdent->d_inode->i_ino;
newdent->d_fsdata = (void *) ctl.fpos;
ncp_new_dentry(newdent);
}
if (ctl.idx >= NCP_DIRCACHE_SIZE) {
if (ctl.page) {
kunmap(ctl.page);
SetPageUptodate(ctl.page);
unlock_page(ctl.page);
page_cache_release(ctl.page);
}
ctl.cache = NULL;
ctl.idx -= NCP_DIRCACHE_SIZE;
ctl.ofs += 1;
ctl.page = grab_cache_page(&inode->i_data, ctl.ofs);
if (ctl.page)
ctl.cache = kmap(ctl.page);
}
if (ctl.cache) {
ctl.cache->dentry[ctl.idx] = newdent;
valid = 1;
}
dput(newdent);
end_advance:
if (!valid)
ctl.valid = 0;
if (!ctl.filled && (ctl.fpos == filp->f_pos)) {
if (!ino)
ino = find_inode_number(dentry, &qname);
if (!ino)
ino = iunique(inode->i_sb, 2);
ctl.filled = filldir(dirent, qname.name, qname.len,
filp->f_pos, ino, DT_UNKNOWN);
if (!ctl.filled)
filp->f_pos += 1;
}
ctl.fpos += 1;
ctl.idx += 1;
*ctrl = ctl;
return (ctl.valid || !ctl.filled);
}
static void
ncp_read_volume_list(struct file *filp, void *dirent, filldir_t filldir,
struct ncp_cache_control *ctl)
{
struct dentry *dentry = filp->f_path.dentry;
struct inode *inode = dentry->d_inode;
struct ncp_server *server = NCP_SERVER(inode);
struct ncp_volume_info info;
struct ncp_entry_info entry;
int i;
DPRINTK("ncp_read_volume_list: pos=%ld\n",
(unsigned long) filp->f_pos);
for (i = 0; i < NCP_NUMBER_OF_VOLUMES; i++) {
if (ncp_get_volume_info_with_number(server, i, &info) != 0)
return;
if (!strlen(info.volume_name))
continue;
DPRINTK("ncp_read_volume_list: found vol: %s\n",
info.volume_name);
if (ncp_lookup_volume(server, info.volume_name,
&entry.i)) {
DPRINTK("ncpfs: could not lookup vol %s\n",
info.volume_name);
continue;
}
entry.volume = entry.i.volNumber;
if (!ncp_fill_cache(filp, dirent, filldir, ctl, &entry))
return;
}
}
static void
ncp_do_readdir(struct file *filp, void *dirent, filldir_t filldir,
struct ncp_cache_control *ctl)
{
struct dentry *dentry = filp->f_path.dentry;
struct inode *dir = dentry->d_inode;
struct ncp_server *server = NCP_SERVER(dir);
struct nw_search_sequence seq;
struct ncp_entry_info entry;
int err;
void* buf;
int more;
size_t bufsize;
DPRINTK("ncp_do_readdir: %s/%s, fpos=%ld\n",
dentry->d_parent->d_name.name, dentry->d_name.name,
(unsigned long) filp->f_pos);
PPRINTK("ncp_do_readdir: init %s, volnum=%d, dirent=%u\n",
dentry->d_name.name, NCP_FINFO(dir)->volNumber,
NCP_FINFO(dir)->dirEntNum);
err = ncp_initialize_search(server, dir, &seq);
if (err) {
DPRINTK("ncp_do_readdir: init failed, err=%d\n", err);
return;
}
/* We MUST NOT use server->buffer_size handshaked with server if we are
using UDP, as for UDP server uses max. buffer size determined by
MTU, and for TCP server uses hardwired value 65KB (== 66560 bytes).
So we use 128KB, just to be sure, as there is no way how to know
this value in advance. */
bufsize = 131072;
buf = vmalloc(bufsize);
if (!buf)
return;
do {
int cnt;
char* rpl;
size_t rpls;
err = ncp_search_for_fileset(server, &seq, &more, &cnt, buf, bufsize, &rpl, &rpls);
if (err) /* Error */
break;
if (!cnt) /* prevent endless loop */
break;
while (cnt--) {
size_t onerpl;
if (rpls < offsetof(struct nw_info_struct, entryName))
break; /* short packet */
ncp_extract_file_info(rpl, &entry.i);
onerpl = offsetof(struct nw_info_struct, entryName) + entry.i.nameLen;
if (rpls < onerpl)
break; /* short packet */
(void)ncp_obtain_nfs_info(server, &entry.i);
rpl += onerpl;
rpls -= onerpl;
entry.volume = entry.i.volNumber;
if (!ncp_fill_cache(filp, dirent, filldir, ctl, &entry))
break;
}
} while (more);
vfree(buf);
return;
}
int ncp_conn_logged_in(struct super_block *sb)
{
struct ncp_server* server = NCP_SBP(sb);
int result;
if (ncp_single_volume(server)) {
int len;
struct dentry* dent;
__u32 volNumber;
__le32 dirEntNum;
__le32 DosDirNum;
__u8 __name[NCP_MAXPATHLEN + 1];
len = sizeof(__name);
result = ncp_io2vol(server, __name, &len, server->m.mounted_vol,
strlen(server->m.mounted_vol), 1);
if (result)
goto out;
result = -ENOENT;
if (ncp_get_volume_root(server, __name, &volNumber, &dirEntNum, &DosDirNum)) {
PPRINTK("ncp_conn_logged_in: %s not found\n",
server->m.mounted_vol);
goto out;
}
dent = sb->s_root;
if (dent) {
struct inode* ino = dent->d_inode;
if (ino) {
NCP_FINFO(ino)->volNumber = volNumber;
NCP_FINFO(ino)->dirEntNum = dirEntNum;
NCP_FINFO(ino)->DosDirNum = DosDirNum;
} else {
DPRINTK("ncpfs: sb->s_root->d_inode == NULL!\n");
}
} else {
DPRINTK("ncpfs: sb->s_root == NULL!\n");
}
}
result = 0;
out:
return result;
}
static struct dentry *ncp_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
{
struct ncp_server *server = NCP_SERVER(dir);
struct inode *inode = NULL;
struct ncp_entry_info finfo;
int error, res, len;
__u8 __name[NCP_MAXPATHLEN + 1];
lock_kernel();
error = -EIO;
if (!ncp_conn_valid(server))
goto finished;
PPRINTK("ncp_lookup: server lookup for %s/%s\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
len = sizeof(__name);
if (ncp_is_server_root(dir)) {
res = ncp_io2vol(server, __name, &len, dentry->d_name.name,
dentry->d_name.len, 1);
if (!res)
res = ncp_lookup_volume(server, __name, &(finfo.i));
} else {
res = ncp_io2vol(server, __name, &len, dentry->d_name.name,
dentry->d_name.len, !ncp_preserve_case(dir));
if (!res)
res = ncp_obtain_info(server, dir, __name, &(finfo.i));
}
PPRINTK("ncp_lookup: looked for %s/%s, res=%d\n",
dentry->d_parent->d_name.name, __name, res);
/*
* If we didn't find an entry, make a negative dentry.
*/
if (res)
goto add_entry;
/*
* Create an inode for the entry.
*/
finfo.opened = 0;
finfo.ino = iunique(dir->i_sb, 2);
finfo.volume = finfo.i.volNumber;
error = -EACCES;
inode = ncp_iget(dir->i_sb, &finfo);
if (inode) {
ncp_new_dentry(dentry);
add_entry:
dentry->d_op = &ncp_dentry_operations;
d_add(dentry, inode);
error = 0;
}
finished:
PPRINTK("ncp_lookup: result=%d\n", error);
unlock_kernel();
return ERR_PTR(error);
}
/*
* This code is common to create, mkdir, and mknod.
*/
static int ncp_instantiate(struct inode *dir, struct dentry *dentry,
struct ncp_entry_info *finfo)
{
struct inode *inode;
int error = -EINVAL;
finfo->ino = iunique(dir->i_sb, 2);
inode = ncp_iget(dir->i_sb, finfo);
if (!inode)
goto out_close;
d_instantiate(dentry,inode);
error = 0;
out:
return error;
out_close:
PPRINTK("ncp_instantiate: %s/%s failed, closing file\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
ncp_close_file(NCP_SERVER(dir), finfo->file_handle);
goto out;
}
int ncp_create_new(struct inode *dir, struct dentry *dentry, int mode,
dev_t rdev, __le32 attributes)
{
struct ncp_server *server = NCP_SERVER(dir);
struct ncp_entry_info finfo;
int error, result, len;
int opmode;
__u8 __name[NCP_MAXPATHLEN + 1];
PPRINTK("ncp_create_new: creating %s/%s, mode=%x\n",
dentry->d_parent->d_name.name, dentry->d_name.name, mode);
error = -EIO;
lock_kernel();
if (!ncp_conn_valid(server))
goto out;
ncp_age_dentry(server, dentry);
len = sizeof(__name);
error = ncp_io2vol(server, __name, &len, dentry->d_name.name,
dentry->d_name.len, !ncp_preserve_case(dir));
if (error)
goto out;
error = -EACCES;
if (S_ISREG(mode) &&
(server->m.flags & NCP_MOUNT_EXTRAS) &&
(mode & S_IXUGO))
attributes |= aSYSTEM | aSHARED;
result = ncp_open_create_file_or_subdir(server, dir, __name,
OC_MODE_CREATE | OC_MODE_OPEN | OC_MODE_REPLACE,
attributes, AR_READ | AR_WRITE, &finfo);
opmode = O_RDWR;
if (result) {
result = ncp_open_create_file_or_subdir(server, dir, __name,
OC_MODE_CREATE | OC_MODE_OPEN | OC_MODE_REPLACE,
attributes, AR_WRITE, &finfo);
if (result) {
if (result == 0x87)
error = -ENAMETOOLONG;
DPRINTK("ncp_create: %s/%s failed\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
goto out;
}
opmode = O_WRONLY;
}
finfo.access = opmode;
if (ncp_is_nfs_extras(server, finfo.volume)) {
finfo.i.nfs.mode = mode;
finfo.i.nfs.rdev = new_encode_dev(rdev);
if (ncp_modify_nfs_info(server, finfo.volume,
finfo.i.dirEntNum,
mode, new_encode_dev(rdev)) != 0)
goto out;
}
error = ncp_instantiate(dir, dentry, &finfo);
out:
unlock_kernel();
return error;
}
static int ncp_create(struct inode *dir, struct dentry *dentry, int mode,
struct nameidata *nd)
{
return ncp_create_new(dir, dentry, mode, 0, 0);
}
static int ncp_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
struct ncp_entry_info finfo;
struct ncp_server *server = NCP_SERVER(dir);
int error, len;
__u8 __name[NCP_MAXPATHLEN + 1];
DPRINTK("ncp_mkdir: making %s/%s\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
error = -EIO;
lock_kernel();
if (!ncp_conn_valid(server))
goto out;
ncp_age_dentry(server, dentry);
len = sizeof(__name);
error = ncp_io2vol(server, __name, &len, dentry->d_name.name,
dentry->d_name.len, !ncp_preserve_case(dir));
if (error)
goto out;
error = -EACCES;
if (ncp_open_create_file_or_subdir(server, dir, __name,
OC_MODE_CREATE, aDIR,
cpu_to_le16(0xffff),
&finfo) == 0)
{
if (ncp_is_nfs_extras(server, finfo.volume)) {
mode |= S_IFDIR;
finfo.i.nfs.mode = mode;
if (ncp_modify_nfs_info(server,
finfo.volume,
finfo.i.dirEntNum,
mode, 0) != 0)
goto out;
}
error = ncp_instantiate(dir, dentry, &finfo);
}
out:
unlock_kernel();
return error;
}
static int ncp_rmdir(struct inode *dir, struct dentry *dentry)
{
struct ncp_server *server = NCP_SERVER(dir);
int error, result, len;
__u8 __name[NCP_MAXPATHLEN + 1];
DPRINTK("ncp_rmdir: removing %s/%s\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
error = -EIO;
lock_kernel();
if (!ncp_conn_valid(server))
goto out;
error = -EBUSY;
if (!d_unhashed(dentry))
goto out;
len = sizeof(__name);
error = ncp_io2vol(server, __name, &len, dentry->d_name.name,
dentry->d_name.len, !ncp_preserve_case(dir));
if (error)
goto out;
result = ncp_del_file_or_subdir(server, dir, __name);
switch (result) {
case 0x00:
error = 0;
break;
case 0x85: /* unauthorized to delete file */
case 0x8A: /* unauthorized to delete file */
error = -EACCES;
break;
case 0x8F:
case 0x90: /* read only */
error = -EPERM;
break;
case 0x9F: /* in use by another client */
error = -EBUSY;
break;
case 0xA0: /* directory not empty */
error = -ENOTEMPTY;
break;
case 0xFF: /* someone deleted file */
error = -ENOENT;
break;
default:
error = -EACCES;
break;
}
out:
unlock_kernel();
return error;
}
static int ncp_unlink(struct inode *dir, struct dentry *dentry)
{
struct inode *inode = dentry->d_inode;
struct ncp_server *server;
int error;
lock_kernel();
server = NCP_SERVER(dir);
DPRINTK("ncp_unlink: unlinking %s/%s\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
error = -EIO;
if (!ncp_conn_valid(server))
goto out;
/*
* Check whether to close the file ...
*/
if (inode) {
PPRINTK("ncp_unlink: closing file\n");
ncp_make_closed(inode);
}
error = ncp_del_file_or_subdir2(server, dentry);
#ifdef CONFIG_NCPFS_STRONG
/* 9C is Invalid path.. It should be 8F, 90 - read only, but
it is not :-( */
if ((error == 0x9C || error == 0x90) && server->m.flags & NCP_MOUNT_STRONG) { /* R/O */
error = ncp_force_unlink(dir, dentry);
}
#endif
switch (error) {
case 0x00:
DPRINTK("ncp: removed %s/%s\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
break;
case 0x85:
case 0x8A:
error = -EACCES;
break;
case 0x8D: /* some files in use */
case 0x8E: /* all files in use */
error = -EBUSY;
break;
case 0x8F: /* some read only */
case 0x90: /* all read only */
case 0x9C: /* !!! returned when in-use or read-only by NW4 */
error = -EPERM;
break;
case 0xFF:
error = -ENOENT;
break;
default:
error = -EACCES;
break;
}
out:
unlock_kernel();
return error;
}
static int ncp_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
struct ncp_server *server = NCP_SERVER(old_dir);
int error;
int old_len, new_len;
__u8 __old_name[NCP_MAXPATHLEN + 1], __new_name[NCP_MAXPATHLEN + 1];
DPRINTK("ncp_rename: %s/%s to %s/%s\n",
old_dentry->d_parent->d_name.name, old_dentry->d_name.name,
new_dentry->d_parent->d_name.name, new_dentry->d_name.name);
error = -EIO;
lock_kernel();
if (!ncp_conn_valid(server))
goto out;
ncp_age_dentry(server, old_dentry);
ncp_age_dentry(server, new_dentry);
old_len = sizeof(__old_name);
error = ncp_io2vol(server, __old_name, &old_len,
old_dentry->d_name.name, old_dentry->d_name.len,
!ncp_preserve_case(old_dir));
if (error)
goto out;
new_len = sizeof(__new_name);
error = ncp_io2vol(server, __new_name, &new_len,
new_dentry->d_name.name, new_dentry->d_name.len,
!ncp_preserve_case(new_dir));
if (error)
goto out;
error = ncp_ren_or_mov_file_or_subdir(server, old_dir, __old_name,
new_dir, __new_name);
#ifdef CONFIG_NCPFS_STRONG
if ((error == 0x90 || error == 0x8B || error == -EACCES) &&
server->m.flags & NCP_MOUNT_STRONG) { /* RO */
error = ncp_force_rename(old_dir, old_dentry, __old_name,
new_dir, new_dentry, __new_name);
}
#endif
switch (error) {
case 0x00:
DPRINTK("ncp renamed %s -> %s.\n",
old_dentry->d_name.name,new_dentry->d_name.name);
break;
case 0x9E:
error = -ENAMETOOLONG;
break;
case 0xFF:
error = -ENOENT;
break;
default:
error = -EACCES;
break;
}
out:
unlock_kernel();
return error;
}
static int ncp_mknod(struct inode * dir, struct dentry *dentry,
int mode, dev_t rdev)
{
if (!new_valid_dev(rdev))
return -EINVAL;
if (ncp_is_nfs_extras(NCP_SERVER(dir), NCP_FINFO(dir)->volNumber)) {
DPRINTK(KERN_DEBUG "ncp_mknod: mode = 0%o\n", mode);
return ncp_create_new(dir, dentry, mode, rdev, 0);
}
return -EPERM; /* Strange, but true */
}
/* The following routines are taken directly from msdos-fs */
/* Linear day numbers of the respective 1sts in non-leap years. */
static int day_n[] =
{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 0, 0, 0, 0};
/* Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec */
extern struct timezone sys_tz;
static int utc2local(int time)
{
return time - sys_tz.tz_minuteswest * 60;
}
static int local2utc(int time)
{
return time + sys_tz.tz_minuteswest * 60;
}
/* Convert a MS-DOS time/date pair to a UNIX date (seconds since 1 1 70). */
int
ncp_date_dos2unix(__le16 t, __le16 d)
{
unsigned short time = le16_to_cpu(t), date = le16_to_cpu(d);
int month, year, secs;
/* first subtract and mask after that... Otherwise, if
date == 0, bad things happen */
month = ((date >> 5) - 1) & 15;
year = date >> 9;
secs = (time & 31) * 2 + 60 * ((time >> 5) & 63) + (time >> 11) * 3600 +
86400 * ((date & 31) - 1 + day_n[month] + (year / 4) +
year * 365 - ((year & 3) == 0 && month < 2 ? 1 : 0) + 3653);
/* days since 1.1.70 plus 80's leap day */
return local2utc(secs);
}
/* Convert linear UNIX date to a MS-DOS time/date pair. */
void
ncp_date_unix2dos(int unix_date, __le16 *time, __le16 *date)
{
int day, year, nl_day, month;
unix_date = utc2local(unix_date);
*time = cpu_to_le16(
(unix_date % 60) / 2 + (((unix_date / 60) % 60) << 5) +
(((unix_date / 3600) % 24) << 11));
day = unix_date / 86400 - 3652;
year = day / 365;
if ((year + 3) / 4 + 365 * year > day)
year--;
day -= (year + 3) / 4 + 365 * year;
if (day == 59 && !(year & 3)) {
nl_day = day;
month = 2;
} else {
nl_day = (year & 3) || day <= 59 ? day : day - 1;
for (month = 1; month < 12; month++)
if (day_n[month] > nl_day)
break;
}
*date = cpu_to_le16(nl_day - day_n[month - 1] + 1 + (month << 5) + (year << 9));
}
Reference in New Issue View Git Blame Copy Permalink