ncpfs/inode.c

/*
 *  inode.c
 *
 *  Copyright (C) 1995 by Volker Lendecke
 *
 */

#include <linux/config.h>
#ifdef MODULE
#include <linux/module.h>
#include <linux/version.h>
#else
#define MOD_INC_USE_COUNT
#define MOD_DEC_USE_COUNT
#endif

#include <asm/system.h>
#include <asm/segment.h>

#include <linux/sched.h>
#include <linux/ncp_fs.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/locks.h>
#include <linux/fcntl.h>
#include <linux/malloc.h>
#include "ncplib.h"

extern int close_fp(struct file *filp);

static void ncp_put_inode(struct inode *);
static void ncp_read_inode(struct inode *);
static void ncp_put_super(struct super_block *);
static void ncp_statfs(struct super_block *sb, struct statfs *buf, int bufsiz);
static int ncp_notify_change(struct inode *inode, struct iattr *attr);

static struct super_operations ncp_sops = {
	ncp_read_inode,         /* read inode */
	ncp_notify_change,	/* notify change */
	NULL,			/* write inode */
	ncp_put_inode,		/* put inode */
	ncp_put_super,		/* put superblock */
	NULL,			/* write superblock */
	ncp_statfs,		/* stat filesystem */
	NULL
        };

/* ncp_read_inode: Called from iget, it only traverses the allocated
   ncp_inode_info's and initializes the inode from the data found
   there.  It does not allocate or deallocate anything. */

static void
ncp_read_inode(struct inode *inode)
{
        /* Our task should be extremely simple here. We only have to
           look up the infomation somebody else (ncp_iget) put into
           the inode tree. The address of this information is the
           inode->i_ino. Just to make sure everything went well, we
           check it's there. */

        struct ncp_inode_info *inode_info
                = (struct ncp_inode_info *)(inode->i_ino);

#if 1
        struct ncp_inode_info *root = &(NCP_SERVER(inode)->root);
        struct ncp_inode_info *check_info = root;

        do {
                if (inode_info == check_info) {
                        if (check_info->state == INODE_LOOKED_UP) {
                                DDPRINTK("ncp_read_inode: found it!\n");
                                goto good;
                        }
                        else {
                                printk("ncp_read_inode: "
                                       "state != INODE_LOOKED_UP\n");
                                return;
                        }
                }
                check_info = check_info->next;
        } while (check_info != root);

        /* Ok, now we're in trouble. The inode info is not there. What
           should we do now??? */
        printk("ncp_read_inode: inode info not found\n");
        return;

 good:
#endif
        inode_info->state = INODE_VALID;

        NCP_INOP(inode) = inode_info;

        if (NCP_INOP(inode)->finfo.attr & aDIR)
                inode->i_mode = NCP_SERVER(inode)->m.dir_mode;
        else
                inode->i_mode = NCP_SERVER(inode)->m.file_mode;

        DDPRINTK("ncp_read_inode: inode->i_mode = %u\n", inode->i_mode);

        inode->i_nlink   = 1;
        inode->i_uid     = NCP_SERVER(inode)->m.uid;
        inode->i_gid     = NCP_SERVER(inode)->m.gid;
        inode->i_size    = NCP_INOP(inode)->finfo.size;
        inode->i_blksize = 1024;
        inode->i_rdev    = 0;
        if ((inode->i_blksize != 0) && (inode->i_size != 0))
                inode->i_blocks =
                        (inode->i_size - 1) / inode->i_blksize + 1;
        else
                inode->i_blocks = 0;

        inode->i_mtime = NCP_INOP(inode)->finfo.mtime;
        inode->i_ctime = NCP_INOP(inode)->finfo.ctime;
        inode->i_atime = NCP_INOP(inode)->finfo.atime;

        if (S_ISREG(inode->i_mode))
                inode->i_op = &ncp_file_inode_operations;
        else if (S_ISDIR(inode->i_mode))
                inode->i_op = &ncp_dir_inode_operations;
        else
                inode->i_op = NULL;

}

static void
ncp_put_inode(struct inode *inode)
{
        struct ncp_dirent *finfo = NCP_FINFO(inode);

        if (finfo->opened != 0) {

                if (ncp_close_file(NCP_SERVER(inode), finfo->file_id) != 0) {
                        /* We can't do anything but complain. */
                        printk("ncp_put_inode: could not close\n");
                }
        }
        
        ncp_free_inode_info(NCP_INOP(inode));

        if (S_ISDIR(inode->i_mode)) {
                DPRINTK("ncp_put_inode: put directory %ld\n",
			inode->i_ino);
                ncp_invalid_dir_cache(inode->i_ino);
        }                

	clear_inode(inode);
}

struct super_block *
ncp_read_super(struct super_block *sb, void *raw_data, int silent)
{
	struct ncp_mount_data *data = (struct ncp_mount_data *) raw_data;
        struct ncp_server *server;
	struct file *ncp_filp;
	struct file *wdog_filp;
	kdev_t dev = sb->s_dev;
	int error;

	if (!data) {
		printk("ncp_read_super: missing data argument\n");
		sb->s_dev = 0;
		return NULL;
	}

	if (data->version != NCP_MOUNT_VERSION) {
		printk("ncp warning: mount version %s than kernel\n",
		       (data->version < NCP_MOUNT_VERSION) ?
                       "older" : "newer");
	}


	if (   (data->ncp_fd >= NR_OPEN)
	    || ((ncp_filp = current->files->fd[data->ncp_fd]) == NULL)
	    || (!S_ISSOCK(ncp_filp->f_inode->i_mode))) {
		printk("ncp_read_super: invalid ncp socket\n");
		sb->s_dev = 0;
		return NULL;
	}

	if (   (data->wdog_fd >= NR_OPEN)
	    || ((wdog_filp = current->files->fd[data->wdog_fd]) == NULL)
	    || (!S_ISSOCK(wdog_filp->f_inode->i_mode))) {
		printk("ncp_read_super: invalid wdog socket\n");
		sb->s_dev = 0;
		return NULL;
	}

        /* We must malloc our own super-block info */
        server = (struct ncp_server *)ncp_kmalloc(sizeof(struct ncp_server),
                                                   GFP_KERNEL);

        if (server == NULL) {
                printk("ncp_read_super: could not alloc ncp_server\n");
                return NULL;
        }

	ncp_filp->f_count += 1;
	wdog_filp->f_count += 1;

	lock_super(sb);

        NCP_SBP(sb) = server;
        
	sb->s_blocksize = 1024; /* Eh...  Is this correct? */
	sb->s_blocksize_bits = 10;
	sb->s_magic = NCP_SUPER_MAGIC;
	sb->s_dev = dev;
	sb->s_op = &ncp_sops;

	server->ncp_filp    = ncp_filp;
	server->wdog_filp   = wdog_filp;
	server->lock        = 0;
	server->wait        = NULL;
        server->packet      = NULL;
	server->buffer_size = 0;

        server->m = *data;
	server->m.file_mode = (server->m.file_mode &
			       (S_IRWXU|S_IRWXG|S_IRWXO)) | S_IFREG;
	server->m.dir_mode  = (server->m.dir_mode &
			       (S_IRWXU|S_IRWXG|S_IRWXO)) | S_IFDIR;

	server->packet_size = NCP_PACKET_SIZE;
	server->packet      = ncp_kmalloc(NCP_PACKET_SIZE, GFP_KERNEL);

	if (server->packet == NULL) {
		printk("ncpfs: could not alloc packet\n");
		error = -ENOMEM;
		unlock_super(sb);
		goto fail;
	}
   
        ncp_init_root(server);

        /*
         * Make the connection to the server
         */

	if (ncp_catch_watchdog(server) != 0) {
		printk("ncp_read_super: Could not catch watchdog\n");
		error = -EINVAL;
		unlock_super(sb);
		goto fail;
	}

	ncp_lock_server(server);
	error = ncp_connect(server);
	ncp_unlock_server(server);
	unlock_super(sb);

	if (error < 0) {
		sb->s_dev = 0;
		printk("ncp_read_super: Failed connection, bailing out "
                       "(error = %d).\n", -error);
                ncp_kfree_s(server->packet, server->packet_size);
		ncp_dont_catch_watchdog(server);
                goto fail;
	}

        DPRINTK("ncp_read_super: NCP_SBP(sb) = %x\n", (int)NCP_SBP(sb));

	if (!(sb->s_mounted = iget(sb, (int)&(server->root)))) {
		sb->s_dev = 0;
		printk("ncp_read_super: get root inode failed\n");
                goto disconnect;
	}

	if (ncp_negotiate_buffersize(server, NCP_DEFAULT_BUFSIZE,
				     &(server->buffer_size)) != 0) {
		sb->s_dev = 0;
		printk("ncp_read_super: could not get bufsize\n");
		goto disconnect;
	}

	DPRINTK("ncpfs: bufsize = %d\n", server->buffer_size);

	if (ncp_login_user(server, server->m.username,
			   server->m.password) != 0) {
		sb->s_dev = 0;
		printk("ncp_read_super: login failed\n");
		goto disconnect;
	}

        MOD_INC_USE_COUNT;
	return sb;

 disconnect:
	ncp_lock_server(server);
	ncp_disconnect(server);
	ncp_unlock_server(server);
	ncp_kfree_s(server->packet, server->packet_size);
	ncp_dont_catch_watchdog(server);
 fail:
	ncp_filp->f_count -= 1;
	wdog_filp->f_count -= 1;
        ncp_kfree_s(NCP_SBP(sb), sizeof(struct ncp_server));
        return NULL;
}

static void
ncp_put_super(struct super_block *sb)
{
        struct ncp_server *server = NCP_SBP(sb);

	lock_super(sb);

	ncp_lock_server(server);
        ncp_disconnect(server);
	ncp_unlock_server(server);

	close_fp(server->ncp_filp);

	ncp_dont_catch_watchdog(server);
	close_fp(server->wdog_filp);

        ncp_free_all_inodes(server);

        ncp_kfree_s(server->packet, server->packet_size);

	sb->s_dev = 0;
        ncp_kfree_s(NCP_SBP(sb), sizeof(struct ncp_server));
	NCP_SBP(sb) = NULL;

	unlock_super(sb);

        MOD_DEC_USE_COUNT;
}

static void 
ncp_statfs(struct super_block *sb, struct statfs *buf, int bufsiz)
{
	struct statfs tmp;
	
	/* We cannot say how much disk space is left on a mounted
           NetWare Server, because free space is distributed over
           volumes, and the current user might have disk quotas. So
           free space is not that simple to determine. Our decision
           here is to err conservatively. */

	tmp.f_type = NCP_SUPER_MAGIC;
	tmp.f_bsize = 512;
	tmp.f_blocks = 0;
	tmp.f_bfree = 0;
	tmp.f_bavail = 0;
	tmp.f_files = -1;
	tmp.f_ffree = -1;
	tmp.f_namelen = 12;
	memcpy_tofs(buf, &tmp, bufsiz);
}

/* DO MORE */
static int
ncp_notify_change(struct inode *inode, struct iattr *attr)
{
	int error = 0;

	if ((error = inode_change_ok(inode, attr)) < 0)
		return error;

	if (((attr->ia_valid & ATTR_UID) && 
	     (attr->ia_uid != NCP_SERVER(inode)->m.uid)))
		return -EPERM;

	if (((attr->ia_valid & ATTR_GID) && 
	     (attr->ia_uid != NCP_SERVER(inode)->m.gid)))
                return -EPERM;

	if (((attr->ia_valid & ATTR_MODE) &&
	     (attr->ia_mode &
	      ~(S_IFREG | S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO))))
		return -EPERM;

        if ((attr->ia_valid & ATTR_SIZE) != 0) {

		struct ncp_file_info finfo;
		struct ncp_dirent *dirent = NCP_FINFO(inode);

		DPRINTK("ncpfs: trying to change size of %s to %ld\n",
			dirent->path, attr->ia_size);

		if (attr->ia_size != 0) {
			return -EPERM;
		}

		if (NCP_FINFO(inode)->opened != 0) {
			ncp_close_file(NCP_SERVER(inode), dirent->file_id);
			dirent->opened = 0;
		}

		if (ncp_create_file(NCP_SERVER(inode), 0,
				    dirent->path, 0, &finfo) == 0) {
			ncp_close_file(NCP_SERVER(inode), finfo.file_id);
			dirent->opened = 0;
		}
		error = 0;
	}

        ncp_invalid_dir_cache((unsigned long)(NCP_INOP(inode)->dir));

	return error;
}
		
#ifdef DEBUG_NCP_MALLOC
int ncp_malloced;
int ncp_current_malloced;
#endif

#ifdef MODULE

char kernel_version[] = UTS_RELEASE;

/* looks ugly, taken from gcc-info */
/* static void *shut_up_gcc = (&shut_up_gcc, kernel_version);*/

static struct file_system_type ncp_fs_type = {
        ncp_read_super, "ncpfs", 0, NULL
        };

int
init_module( void)
{
        DPRINTK("ncpfs: init_module called\n");

#ifdef DEBUG_NCP_MALLOC
        ncp_malloced = 0;
        ncp_current_malloced = 0;
#endif

        ncp_init_dir_cache();
        register_filesystem(&ncp_fs_type);
        return 0;
}

void
cleanup_module(void)
{
        DPRINTK("ncpfs: cleanup_module called\n");
        ncp_free_dir_cache();
        unregister_filesystem(&ncp_fs_type);
#ifdef DEBUG_NCP_MALLOC
        printk("ncp_malloced: %d\n", ncp_malloced);
        printk("ncp_current_malloced: %d\n", ncp_current_malloced);
#endif
}

#endif