dir.c 32.2 KB
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/*
 *  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/vmalloc.h>
#include <linux/mm.h>
#include <asm/uaccess.h>
#include <asm/byteorder.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
		      
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const struct file_operations ncp_dir_operations =
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{
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	.llseek		= generic_file_llseek,
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	.read		= generic_read_dir,
	.readdir	= ncp_readdir,
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	.unlocked_ioctl	= ncp_ioctl,
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#ifdef CONFIG_COMPAT
	.compat_ioctl	= ncp_compat_ioctl,
#endif
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};

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const struct inode_operations ncp_dir_inode_operations =
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{
	.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 *);
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static int ncp_hash_dentry(const struct dentry *, const struct inode *,
		struct qstr *);
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static int ncp_compare_dentry(const struct dentry *, const struct inode *,
		const struct dentry *, const struct inode *,
		unsigned int, const char *, const struct qstr *);
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static int ncp_delete_dentry(const struct dentry *);
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static const struct dentry_operations ncp_dentry_operations =
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{
	.d_revalidate	= ncp_lookup_validate,
	.d_hash		= ncp_hash_dentry,
	.d_compare	= ncp_compare_dentry,
	.d_delete	= ncp_delete_dentry,
};

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const struct dentry_operations ncp_root_dentry_operations =
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{
	.d_hash		= ncp_hash_dentry,
	.d_compare	= ncp_compare_dentry,
	.d_delete	= ncp_delete_dentry,
};


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#define ncp_namespace(i)	(NCP_SERVER(i)->name_space[NCP_FINFO(i)->volNumber])

static inline int ncp_preserve_entry_case(struct inode *i, __u32 nscreator)
{
#ifdef CONFIG_NCPFS_SMALLDOS
	int ns = ncp_namespace(i);

	if ((ns == NW_NS_DOS)
#ifdef CONFIG_NCPFS_OS2_NS
		|| ((ns == NW_NS_OS2) && (nscreator == NW_NS_DOS))
#endif /* CONFIG_NCPFS_OS2_NS */
	   )
		return 0;
#endif /* CONFIG_NCPFS_SMALLDOS */
	return 1;
}

#define ncp_preserve_case(i)	(ncp_namespace(i) != NW_NS_DOS)

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static inline int ncp_case_sensitive(const struct inode *i)
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{
#ifdef CONFIG_NCPFS_NFS_NS
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	return ncp_namespace(i) == NW_NS_NFS;
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#else
	return 0;
#endif /* CONFIG_NCPFS_NFS_NS */
}

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/*
 * Note: leave the hash unchanged if the directory
 * is case-sensitive.
 */
static int 
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ncp_hash_dentry(const struct dentry *dentry, const struct inode *inode,
		struct qstr *this)
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{
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	if (!ncp_case_sensitive(inode)) {
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		struct super_block *sb = dentry->d_sb;
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		struct nls_table *t;
		unsigned long hash;
		int i;
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		t = NCP_IO_TABLE(sb);
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		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
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ncp_compare_dentry(const struct dentry *parent, const struct inode *pinode,
		const struct dentry *dentry, const struct inode *inode,
		unsigned int len, const char *str, const struct qstr *name)
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{
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	if (len != name->len)
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		return 1;

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	if (ncp_case_sensitive(pinode))
		return strncmp(str, name->name, len);
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	return ncp_strnicmp(NCP_IO_TABLE(pinode->i_sb), str, name->name, len);
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}

/*
 * 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
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ncp_delete_dentry(const struct dentry * dentry)
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{
	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
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ncp_lookup_validate(struct dentry *dentry, struct nameidata *nd)
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{
	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);

	/*
	 * 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);
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		if (!res) {
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			res = ncp_lookup_volume(server, __name, &(finfo.i));
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			if (!res)
				ncp_update_known_namespace(server, finfo.i.volNumber, NULL);
		}
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	} 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) {
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		struct inode *inode = dentry->d_inode;

		mutex_lock(&inode->i_mutex);
		if (finfo.i.dirEntNum == NCP_FINFO(inode)->dirEntNum) {
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			ncp_new_dentry(dentry);
			val=1;
		} else
			DDPRINTK("ncp_lookup_validate: found, but dirEntNum changed\n");

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		ncp_update_inode2(inode, &finfo);
		mutex_unlock(&inode->i_mutex);
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	}

finished:
	DDPRINTK("ncp_lookup_validate: result=%d\n", val);
	dput(parent);
	return val;
}

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) {
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		dent = list_entry(next, struct dentry, d_u.d_child);
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		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)
{
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	struct dentry *dentry = filp->f_path.dentry;
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	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;

	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;
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	/* Do not generate '.' and '..' when server is dead. */
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	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:
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	if (ctl.page) {
		kunmap(ctl.page);
		SetPageUptodate(ctl.page);
		unlock_page(ctl.page);
		page_cache_release(ctl.page);
	}
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	if (page) {
		cache->head = ctl.head;
		kunmap(page);
		SetPageUptodate(page);
		unlock_page(page);
		page_cache_release(page);
	}
out:
	return result;
}

static int
ncp_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
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		struct ncp_cache_control *ctrl, struct ncp_entry_info *entry,
		int inval_childs)
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{
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	struct dentry *newdent, *dentry = filp->f_path.dentry;
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	struct inode *dir = dentry->d_inode;
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	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);
P
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	if (ncp_vol2io(NCP_SERVER(dir), __name, &qname.len,
L
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			entry->i.entryName, entry->i.nameLen,
P
Petr Vandrovec 已提交
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			!ncp_preserve_entry_case(dir, entry->i.NSCreator)))
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		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)
N
Nick Piggin 已提交
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		if (dentry->d_op->d_hash(dentry, dentry->d_inode, &qname) != 0)
L
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			goto end_advance;

	newdent = d_lookup(dentry, &qname);

	if (!newdent) {
		newdent = d_alloc(dentry, &qname);
		if (!newdent)
			goto end_advance;
	} else {
		hashed = 1;
P
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613 614 615 616 617 618 619 620

		/* If case sensitivity changed for this volume, all entries below this one
		   should be thrown away.  This entry itself is not affected, as its case
		   sensitivity is controlled by its own parent. */
		if (inval_childs)
			shrink_dcache_parent(newdent);

		/*
N
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		 * NetWare's OS2 namespace is case preserving yet case
		 * insensitive.  So we update dentry's name as received from
		 * server. Parent dir's i_mutex is locked because we're in
		 * readdir.
P
Petr Vandrovec 已提交
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		 */
N
Nick Piggin 已提交
626
		dentry_update_name_case(newdent, &qname);
L
Linus Torvalds 已提交
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	}

	if (!newdent->d_inode) {
P
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630 631
		struct inode *inode;

L
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		entry->opened = 0;
P
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		entry->ino = iunique(dir->i_sb, 2);
		inode = ncp_iget(dir->i_sb, entry);
		if (inode) {
L
Linus Torvalds 已提交
636
			newdent->d_op = &ncp_dentry_operations;
P
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637
			d_instantiate(newdent, inode);
L
Linus Torvalds 已提交
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			if (!hashed)
				d_rehash(newdent);
		}
P
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641 642 643
	} else {
		struct inode *inode = newdent->d_inode;

N
Nick Piggin 已提交
644
		mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
P
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		ncp_update_inode2(inode, entry);
		mutex_unlock(&inode->i_mutex);
	}
L
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	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;
P
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		ctl.page  = grab_cache_page(&dir->i_data, ctl.ofs);
L
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		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)
P
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681
			ino = iunique(dir->i_sb, 2);
L
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		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)
{
J
Josef Sipek 已提交
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	struct dentry *dentry = filp->f_path.dentry;
L
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	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++) {
P
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		int inval_dentry;
L
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		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;
		}
P
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		inval_dentry = ncp_update_known_namespace(server, entry.i.volNumber, NULL);
L
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		entry.volume = entry.i.volNumber;
P
Petr Vandrovec 已提交
726
		if (!ncp_fill_cache(filp, dirent, filldir, ctl, &entry, inval_dentry))
L
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			return;
	}
}

static void
ncp_do_readdir(struct file *filp, void *dirent, filldir_t filldir,
						struct ncp_cache_control *ctl)
{
J
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	struct dentry *dentry = filp->f_path.dentry;
L
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736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788
	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;
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			if (!ncp_fill_cache(filp, dirent, filldir, ctl, &entry, 0))
L
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				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) {
P
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				ncp_update_known_namespace(server, volNumber, NULL);
L
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				NCP_FINFO(ino)->volNumber = volNumber;
				NCP_FINFO(ino)->dirEntNum = dirEntNum;
				NCP_FINFO(ino)->DosDirNum = DosDirNum;
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				result = 0;
L
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			} else {
				DPRINTK("ncpfs: sb->s_root->d_inode == NULL!\n");
			}
		} else {
			DPRINTK("ncpfs: sb->s_root == NULL!\n");
		}
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	} else
		result = 0;
L
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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];

	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));
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			if (!res)
				ncp_update_known_namespace(server, finfo.i.volNumber, NULL);
L
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866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963
	} 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);
	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);

	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;
P
Petr Vandrovec 已提交
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			else if (result < 0)
				error = result;
L
Linus Torvalds 已提交
966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009
			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:
	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);

	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;

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1010
	error = ncp_open_create_file_or_subdir(server, dir, __name,
L
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1011 1012
					   OC_MODE_CREATE, aDIR,
					   cpu_to_le16(0xffff),
P
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					   &finfo);
	if (error == 0) {
L
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1015 1016 1017 1018 1019 1020 1021 1022 1023 1024
		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);
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1025 1026
	} else if (error > 0) {
		error = -EACCES;
L
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1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073
	}
out:
	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 = -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:
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			error = result < 0 ? result : -EACCES;
L
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			break;
       	}
out:
	return error;
}

static int ncp_unlink(struct inode *dir, struct dentry *dentry)
{
	struct inode *inode = dentry->d_inode;
	struct ncp_server *server;
	int error;

	server = NCP_SERVER(dir);
	DPRINTK("ncp_unlink: unlinking %s/%s\n",
		dentry->d_parent->d_name.name, dentry->d_name.name);
	
	/*
	 * 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:
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			error = error < 0 ? error : -EACCES;
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			break;
	}
	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);

	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:
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			error = error < 0 ? error : -EACCES;
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			break;
	}
out:
	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;
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		for (month = 1; month < 12; month++)
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			if (day_n[month] > nl_day)
				break;
	}
	*date = cpu_to_le16(nl_day - day_n[month - 1] + 1 + (month << 5) + (year << 9));
}