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/*

 *  inode.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 Wolfram Pienkoss for NLS

 *

 */

#include <linux/config.h>

#include <linux/module.h>

#include <asm/system.h>

#include <asm/uaccess.h>

#include <asm/byteorder.h>

#include <linux/sched.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/file.h>

#include <linux/fcntl.h>

#include <linux/slab.h>

#include <linux/vmalloc.h>

#include <linux/init.h>

#include <linux/ncp_fs.h>

#include "ncplib_kernel.h"

static void ncp_delete_inode(struct inode *);

static void ncp_put_super(struct super_block *);

static int  ncp_statfs(struct super_block *, struct statfs *);

static struct super_operations ncp_sops =

{

        put_inode:      force_delete,

        delete_inode:   ncp_delete_inode,

        put_super:      ncp_put_super,

        statfs:         ncp_statfs,

};

extern struct dentry_operations ncp_root_dentry_operations;

#ifdef CONFIG_NCPFS_EXTRAS

extern struct address_space_operations ncp_symlink_aops;

extern int ncp_symlink(struct inode*, struct dentry*, const char*);

#endif

/*

 * Fill in the ncpfs-specific information in the inode.

 */

void ncp_update_inode(struct inode *inode, struct ncp_entry_info *nwinfo)

{

        NCP_FINFO(inode)->DosDirNum = nwinfo->i.DosDirNum;

        NCP_FINFO(inode)->dirEntNum = nwinfo->i.dirEntNum;

        NCP_FINFO(inode)->volNumber = nwinfo->i.volNumber;

#ifdef CONFIG_NCPFS_STRONG

        NCP_FINFO(inode)->nwattr = nwinfo->i.attributes;

#endif

        NCP_FINFO(inode)->access = nwinfo->access;

        NCP_FINFO(inode)->server_file_handle = nwinfo->server_file_handle;

        memcpy(NCP_FINFO(inode)->file_handle, nwinfo->file_handle,

                        sizeof(nwinfo->file_handle));

        DPRINTK("ncp_update_inode: updated %s, volnum=%d, dirent=%u\n",

                nwinfo->i.entryName, NCP_FINFO(inode)->volNumber,

                NCP_FINFO(inode)->dirEntNum);

}

void ncp_update_inode2(struct inode* inode, struct ncp_entry_info *nwinfo)

{

        struct nw_info_struct *nwi = &nwinfo->i;

        struct ncp_server *server = NCP_SERVER(inode);

        if (!atomic_read(&NCP_FINFO(inode)->opened)) {

#ifdef CONFIG_NCPFS_STRONG

                NCP_FINFO(inode)->nwattr = nwi->attributes;

#endif

                if (nwi->attributes & aDIR) {

                        inode->i_mode = server->m.dir_mode;

                        inode->i_size = NCP_BLOCK_SIZE;

                } else {

                        inode->i_mode = server->m.file_mode;

                        inode->i_size = le32_to_cpu(nwi->dataStreamSize);

#ifdef CONFIG_NCPFS_EXTRAS

                        if ((server->m.flags & (NCP_MOUNT_EXTRAS|NCP_MOUNT_SYMLINKS)) && (nwi->attributes & aSHARED)) {

                                switch (nwi->attributes & (aHIDDEN|aSYSTEM)) {

                                        case aHIDDEN:

                                                if (server->m.flags & NCP_MOUNT_SYMLINKS) {

                                                        if ( /* (inode->i_size >= NCP_MIN_SYMLINK_SIZE)

                                                         && */ (inode->i_size <= NCP_MAX_SYMLINK_SIZE)) {

                                                                inode->i_mode = (inode->i_mode & ~S_IFMT) | S_IFLNK;

                                                                break;

                                                        }

                                                }

                                                /* FALLTHROUGH */

                                        case 0:

                                                if (server->m.flags & NCP_MOUNT_EXTRAS)

                                                        inode->i_mode |= 0444;

                                                break;

                                        case aSYSTEM:

                                                if (server->m.flags & NCP_MOUNT_EXTRAS)

                                                        inode->i_mode |= (inode->i_mode >> 2) & 0111;

                                                break;

                                        /* case aSYSTEM|aHIDDEN: */

                                        default:

                                                /* reserved combination */

                                                break;

                                }

                        }

#endif

                }

                if (nwi->attributes & aRONLY) inode->i_mode &= ~0222;

        }

        inode->i_blocks = (inode->i_size + NCP_BLOCK_SIZE - 1) >> NCP_BLOCK_SHIFT;

        inode->i_mtime = ncp_date_dos2unix(le16_to_cpu(nwi->modifyTime),

                                           le16_to_cpu(nwi->modifyDate));

        inode->i_ctime = ncp_date_dos2unix(le16_to_cpu(nwi->creationTime),

                                           le16_to_cpu(nwi->creationDate));

        inode->i_atime = ncp_date_dos2unix(0, le16_to_cpu(nwi->lastAccessDate));

        NCP_FINFO(inode)->DosDirNum = nwi->DosDirNum;

        NCP_FINFO(inode)->dirEntNum = nwi->dirEntNum;

        NCP_FINFO(inode)->volNumber = nwi->volNumber;

}

/*

 * Fill in the inode based on the ncp_entry_info structure.

 */

static void ncp_set_attr(struct inode *inode, struct ncp_entry_info *nwinfo)

{

        struct nw_info_struct *nwi = &nwinfo->i;

        struct ncp_server *server = NCP_SERVER(inode);

        if (nwi->attributes & aDIR) {

                inode->i_mode = server->m.dir_mode;

                /* for directories dataStreamSize seems to be some

                   Object ID ??? */

                inode->i_size = NCP_BLOCK_SIZE;

        } else {

                inode->i_mode = server->m.file_mode;

                inode->i_size = le32_to_cpu(nwi->dataStreamSize);

#ifdef CONFIG_NCPFS_EXTRAS

                if ((server->m.flags & (NCP_MOUNT_EXTRAS|NCP_MOUNT_SYMLINKS))

                 && (nwi->attributes & aSHARED)) {

                        switch (nwi->attributes & (aHIDDEN|aSYSTEM)) {

                                case aHIDDEN:

                                        if (server->m.flags & NCP_MOUNT_SYMLINKS) {

                                                if (/* (inode->i_size >= NCP_MIN_SYMLINK_SIZE)

                                                 && */ (inode->i_size <= NCP_MAX_SYMLINK_SIZE)) {

                                                        inode->i_mode = (inode->i_mode & ~S_IFMT) | S_IFLNK;

                                                        break;

                                                }

                                        }

                                        /* FALLTHROUGH */

                                case 0:

                                        if (server->m.flags & NCP_MOUNT_EXTRAS)

                                                inode->i_mode |= 0444;

                                        break;

                                case aSYSTEM:

                                        if (server->m.flags & NCP_MOUNT_EXTRAS)

                                                inode->i_mode |= (inode->i_mode >> 2) & 0111;

                                        break;

                                /* case aSYSTEM|aHIDDEN: */

                                default:

                                        /* reserved combination */

                                        break;

                        }

                }

#endif

        }

        if (nwi->attributes & aRONLY) inode->i_mode &= ~0222;

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

        inode->i_nlink = 1;

        inode->i_uid = server->m.uid;

        inode->i_gid = server->m.gid;

        inode->i_rdev = 0;

        inode->i_blksize = NCP_BLOCK_SIZE;

        inode->i_blocks = (inode->i_size + NCP_BLOCK_SIZE - 1) >> NCP_BLOCK_SHIFT;

        inode->i_mtime = ncp_date_dos2unix(le16_to_cpu(nwi->modifyTime),

                                           le16_to_cpu(nwi->modifyDate));

        inode->i_ctime = ncp_date_dos2unix(le16_to_cpu(nwi->creationTime),

                                           le16_to_cpu(nwi->creationDate));

        inode->i_atime = ncp_date_dos2unix(0,

                                           le16_to_cpu(nwi->lastAccessDate));

        ncp_update_inode(inode, nwinfo);

}

static struct inode_operations ncp_symlink_inode_operations = {

        readlink:       page_readlink,

        follow_link:    page_follow_link,

        setattr:        ncp_notify_change,

};

/*

 * Get a new inode.

 */

struct inode *

ncp_iget(struct super_block *sb, struct ncp_entry_info *info)

{

        struct inode *inode;

        if (info == NULL) {

                printk(KERN_ERR "ncp_iget: info is NULL\n");

                return NULL;

        }

        inode = new_inode(sb);

        if (inode) {

                init_MUTEX(&NCP_FINFO(inode)->open_sem);

                atomic_set(&NCP_FINFO(inode)->opened, info->opened);

                inode->i_ino = info->ino;

                ncp_set_attr(inode, info);

                if (S_ISREG(inode->i_mode)) {

                        inode->i_op = &ncp_file_inode_operations;

                        inode->i_fop = &ncp_file_operations;

                } else if (S_ISDIR(inode->i_mode)) {

                        inode->i_op = &ncp_dir_inode_operations;

                        inode->i_fop = &ncp_dir_operations;

#ifdef CONFIG_NCPFS_EXTRAS

                } else if (S_ISLNK(inode->i_mode)) {

                        inode->i_op = &ncp_symlink_inode_operations;

                        inode->i_data.a_ops = &ncp_symlink_aops;

#endif

                }

                insert_inode_hash(inode);

        } else

                printk(KERN_ERR "ncp_iget: iget failed!\n");

        return inode;

}

static void

ncp_delete_inode(struct inode *inode)

{

        if (S_ISDIR(inode->i_mode)) {

                DDPRINTK("ncp_delete_inode: put directory %ld\n", inode->i_ino);

        }

        if (ncp_make_closed(inode) != 0) {

                /* We can't do anything but complain. */

                printk(KERN_ERR "ncp_delete_inode: could not close\n");

        }

        clear_inode(inode);

}

struct super_block *

ncp_read_super(struct super_block *sb, void *raw_data, int silent)

{

        struct ncp_mount_data_kernel data;

        struct ncp_server *server;

        struct file *ncp_filp;

        struct inode *root_inode;

        struct inode *sock_inode;

        struct socket *sock;

        int error;

        int default_bufsize;

#ifdef CONFIG_NCPFS_PACKET_SIGNING

        int options;

#endif

        struct ncp_entry_info finfo;

        if (raw_data == NULL)

                goto out_no_data;

        switch (*(int*)raw_data) {

                case NCP_MOUNT_VERSION:

                        {

                                struct ncp_mount_data* md = (struct ncp_mount_data*)raw_data;

                                data.flags = md->flags;

                                data.int_flags = NCP_IMOUNT_LOGGEDIN_POSSIBLE;

                                data.mounted_uid = md->mounted_uid;

                                data.wdog_pid = md->wdog_pid;

                                data.ncp_fd = md->ncp_fd;

                                data.time_out = md->time_out;

                                data.retry_count = md->retry_count;

                                data.uid = md->uid;

                                data.gid = md->gid;

                                data.file_mode = md->file_mode;

                                data.dir_mode = md->dir_mode;

                                memcpy(data.mounted_vol, md->mounted_vol,

                                        NCP_VOLNAME_LEN+1);

                        }

                        break;

                case NCP_MOUNT_VERSION_V4:

                        {

                                struct ncp_mount_data_v4* md = (struct ncp_mount_data_v4*)raw_data;

                                data.flags = md->flags;

                                data.int_flags = 0;

                                data.mounted_uid = md->mounted_uid;

                                data.wdog_pid = md->wdog_pid;

                                data.ncp_fd = md->ncp_fd;

                                data.time_out = md->time_out;

                                data.retry_count = md->retry_count;

                                data.uid = md->uid;

                                data.gid = md->gid;

                                data.file_mode = md->file_mode;

                                data.dir_mode = md->dir_mode;

                                data.mounted_vol[0] = 0;

                        }

                        break;

                default:

                        goto out_bad_mount;

        }

        ncp_filp = fget(data.ncp_fd);

        if (!ncp_filp)

                goto out_bad_file;

        sock_inode = ncp_filp->f_dentry->d_inode;

        if (!S_ISSOCK(sock_inode->i_mode))

                goto out_bad_file2;

        sock = &sock_inode->u.socket_i;

        if (!sock)

                goto out_bad_file2;

        if (sock->type == SOCK_STREAM)

                default_bufsize = 61440;

        else

                default_bufsize = 1024;

        sb->s_blocksize = 1024; /* Eh...  Is this correct? */

        sb->s_blocksize_bits = 10;

        sb->s_magic = NCP_SUPER_MAGIC;

        sb->s_op = &ncp_sops;

        server = NCP_SBP(sb);

        memset(server, 0, sizeof(*server));

        server->ncp_filp = ncp_filp;

/*      server->lock = 0;       */

        init_MUTEX(&server->sem);

        server->packet = NULL;

/*      server->buffer_size = 0;        */

/*      server->conn_status = 0;        */

/*      server->root_dentry = NULL;     */

/*      server->root_setuped = 0;       */

#ifdef CONFIG_NCPFS_PACKET_SIGNING

/*      server->sign_wanted = 0;        */

/*      server->sign_active = 0;        */

#endif

        server->auth.auth_type = NCP_AUTH_NONE;

/*      server->auth.object_name_len = 0;       */

/*      server->auth.object_name = NULL;        */

/*      server->auth.object_type = 0;           */

/*      server->priv.len = 0;                   */

/*      server->priv.data = NULL;               */

        server->m = data;

        /* Althought anything producing this is buggy, it happens

           now because of PATH_MAX changes.. */

        if (server->m.time_out < 1) {

                server->m.time_out = 10;

                printk(KERN_INFO "You need to recompile your ncpfs utils..\n");

        }

        server->m.time_out = server->m.time_out * HZ / 100;

        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;

#ifdef CONFIG_NCPFS_NLS

        /* load the default NLS charsets */

        server->nls_vol = load_nls_default();

        server->nls_io = load_nls_default();

#endif /* CONFIG_NCPFS_NLS */

        server->dentry_ttl = 0;  /* no caching */

#undef NCP_PACKET_SIZE

#define NCP_PACKET_SIZE 65536

        server->packet_size = NCP_PACKET_SIZE;

        server->packet = vmalloc(NCP_PACKET_SIZE);

        if (server->packet == NULL)

                goto out_no_packet;

        ncp_lock_server(server);

        error = ncp_connect(server);

        ncp_unlock_server(server);

        if (error < 0)

                goto out_no_connect;

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

#ifdef CONFIG_NCPFS_PACKET_SIGNING

        if (ncp_negotiate_size_and_options(server, default_bufsize,

                NCP_DEFAULT_OPTIONS, &(server->buffer_size), &options) == 0)

        {

                if (options != NCP_DEFAULT_OPTIONS)

                {

                        if (ncp_negotiate_size_and_options(server,

                                default_bufsize,

                                options & 2,

                                &(server->buffer_size), &options) != 0)

                        {

                                goto out_no_bufsize;

                        }

                }

                if (options & 2)

                        server->sign_wanted = 1;

        }

        else

#endif  /* CONFIG_NCPFS_PACKET_SIGNING */

        if (ncp_negotiate_buffersize(server, default_bufsize,

                                     &(server->buffer_size)) != 0)

                goto out_no_bufsize;

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

        memset(&finfo, 0, sizeof(finfo));

        finfo.i.attributes      = aDIR;

        finfo.i.dataStreamSize  = NCP_BLOCK_SIZE;

        finfo.i.dirEntNum       = 0;

        finfo.i.DosDirNum       = 0;

#ifdef CONFIG_NCPFS_SMALLDOS

        finfo.i.NSCreator       = NW_NS_DOS;

#endif

        finfo.i.volNumber       = NCP_NUMBER_OF_VOLUMES + 1;    /* illegal volnum */

        /* set dates of mountpoint to Jan 1, 1986; 00:00 */

        finfo.i.creationTime    = finfo.i.modifyTime

                                = cpu_to_le16(0x0000);

        finfo.i.creationDate    = finfo.i.modifyDate

                                = finfo.i.lastAccessDate

                                = cpu_to_le16(0x0C21);

        finfo.i.nameLen         = 0;

        finfo.i.entryName[0]     = '\0';

        finfo.opened            = 0;

        finfo.ino               = 2;    /* tradition */

        server->name_space[finfo.i.volNumber] = NW_NS_DOS;

        root_inode = ncp_iget(sb, &finfo);

        if (!root_inode)

                goto out_no_root;

        DPRINTK("ncp_read_super: root vol=%d\n", NCP_FINFO(root_inode)->volNumber);

        sb->s_root = d_alloc_root(root_inode);

        if (!sb->s_root)

                goto out_no_root;

        sb->s_root->d_op = &ncp_root_dentry_operations;

        return sb;

out_no_root:

        printk(KERN_ERR "ncp_read_super: get root inode failed\n");

        iput(root_inode);

        goto out_disconnect;

out_no_bufsize:

        printk(KERN_ERR "ncp_read_super: could not get bufsize\n");

out_disconnect:

        ncp_lock_server(server);

        ncp_disconnect(server);

        ncp_unlock_server(server);

        goto out_free_packet;

out_no_connect:

        printk(KERN_ERR "ncp_read_super: Failed connection, error=%d\n", error);

out_free_packet:

        vfree(server->packet);

        goto out_free_server;

out_no_packet:

        printk(KERN_ERR "ncp_read_super: could not alloc packet\n");

out_free_server:

#ifdef CONFIG_NCPFS_NLS

        unload_nls(server->nls_io);

        unload_nls(server->nls_vol);

#endif

        /* 23/12/1998 Marcin Dalecki <dalecki@cs.net.pl>:

         *

         * The previously used put_filp(ncp_filp); was bogous, since

         * it doesn't proper unlocking.

         */

        fput(ncp_filp);

        goto out;

out_bad_file2:

        fput(ncp_filp);

out_bad_file:

        printk(KERN_ERR "ncp_read_super: invalid ncp socket\n");

        goto out;

out_bad_mount:

        printk(KERN_INFO "ncp_read_super: kernel requires mount version %d\n",

                NCP_MOUNT_VERSION);

        goto out;

out_no_data:

        printk(KERN_ERR "ncp_read_super: missing data argument\n");

out:

        return NULL;

}

static void ncp_put_super(struct super_block *sb)

{

        struct ncp_server *server = NCP_SBP(sb);

        ncp_lock_server(server);

        ncp_disconnect(server);

        ncp_unlock_server(server);

#ifdef CONFIG_NCPFS_NLS

        /* unload the NLS charsets */

        if (server->nls_vol)

        {

                unload_nls(server->nls_vol);

                server->nls_vol = NULL;

        }

        if (server->nls_io)

        {

                unload_nls(server->nls_io);

                server->nls_io = NULL;

        }

#endif /* CONFIG_NCPFS_NLS */

        fput(server->ncp_filp);

        kill_proc(server->m.wdog_pid, SIGTERM, 1);

        if (server->priv.data)

                ncp_kfree_s(server->priv.data, server->priv.len);

        if (server->auth.object_name)

                ncp_kfree_s(server->auth.object_name, server->auth.object_name_len);

        vfree(server->packet);

}

static int ncp_statfs(struct super_block *sb, struct statfs *buf)

{

        /* 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. */

        buf->f_type = NCP_SUPER_MAGIC;

        buf->f_bsize = NCP_BLOCK_SIZE;

        buf->f_blocks = 0;

        buf->f_bfree = 0;

        buf->f_bavail = 0;

        buf->f_namelen = 12;

        return 0;

}

int ncp_notify_change(struct dentry *dentry, struct iattr *attr)

{

        struct inode *inode = dentry->d_inode;

        int result = 0;

        int info_mask;

        struct nw_modify_dos_info info;

        struct ncp_server *server;

        result = -EIO;

        server = NCP_SERVER(inode);

        if ((!server) || !ncp_conn_valid(server))

                goto out;

        /* ageing the dentry to force validation */

        ncp_age_dentry(server, dentry);

        result = inode_change_ok(inode, attr);

        if (result < 0)

                goto out;

        result = -EPERM;

        if (((attr->ia_valid & ATTR_UID) &&

             (attr->ia_uid != server->m.uid)))

                goto out;

        if (((attr->ia_valid & ATTR_GID) &&

             (attr->ia_gid != server->m.gid)))

                goto out;

        if (((attr->ia_valid & ATTR_MODE) &&

             (attr->ia_mode &

              ~(S_IFREG | S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO))))

                goto out;

        info_mask = 0;

        memset(&info, 0, sizeof(info));

#if 1 

        if ((attr->ia_valid & ATTR_MODE) != 0)

        {

                if (S_ISDIR(inode->i_mode)) {

                        umode_t newmode;

                        info_mask |= DM_ATTRIBUTES;

                        newmode = attr->ia_mode;

                        newmode &= NCP_SERVER(inode)->m.dir_mode;

                        if (newmode & 0222)

                                info.attributes &= ~(aRONLY|aRENAMEINHIBIT|aDELETEINHIBIT);

                        else

                                info.attributes |=  (aRONLY|aRENAMEINHIBIT|aDELETEINHIBIT);

                } else if (!S_ISREG(inode->i_mode))

                {

                        return -EPERM;

                }

                else

                {

                        umode_t newmode;

#ifdef CONFIG_NCPFS_EXTRAS                      

                        int extras;

                        extras = server->m.flags & NCP_MOUNT_EXTRAS;

#endif

                        info_mask |= DM_ATTRIBUTES;

                        newmode=attr->ia_mode;

#ifdef CONFIG_NCPFS_EXTRAS

                        if (!extras)

#endif

                                newmode &= server->m.file_mode;

                        if (newmode & 0222) /* any write bit set */

                        {

                                info.attributes &= ~(aRONLY|aRENAMEINHIBIT|aDELETEINHIBIT);

                        }

                        else

                        {

                                info.attributes |=  (aRONLY|aRENAMEINHIBIT|aDELETEINHIBIT);

                        }

#ifdef CONFIG_NCPFS_EXTRAS

                        if (extras) {

                                if (newmode & 0111) /* any execute bit set */

                                        info.attributes |= aSHARED | aSYSTEM;

                                /* read for group/world and not in default file_mode */

                                else if (newmode & ~server->m.file_mode & 0444)

                                        info.attributes |= aSHARED;

                        }

#endif

                }

        }

#endif

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

                info_mask |= (DM_CREATE_TIME | DM_CREATE_DATE);

                ncp_date_unix2dos(attr->ia_ctime,

                             &(info.creationTime), &(info.creationDate));

                info.creationTime = le16_to_cpu(info.creationTime);

                info.creationDate = le16_to_cpu(info.creationDate);

        }

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

                info_mask |= (DM_MODIFY_TIME | DM_MODIFY_DATE);

                ncp_date_unix2dos(attr->ia_mtime,

                                  &(info.modifyTime), &(info.modifyDate));