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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [fs/] [smbfs/] [dir.c] - Blame information for rev 1765

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/*
 *  dir.c
 *
 *  Copyright (C) 1995, 1996 by Paal-Kr. Engstad and Volker Lendecke
 *
 */
 
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/stat.h>
#include <linux/kernel.h>
#include <linux/malloc.h>
#include <linux/mm.h>
#include <linux/smb_fs.h>
#include <linux/smbno.h>
#include <asm/segment.h>
#include <asm/semaphore.h>
#include <linux/errno.h>
 
static int
 smb_dir_read(struct inode *inode, struct file *filp, char *buf, int count);
 
static int
 smb_readdir(struct inode *inode, struct file *filp,
             void *dirent, filldir_t filldir);
 
static struct smb_inode_info *
 smb_find_dir_inode(struct inode *parent, const char *name, int len);
 
static int
 smb_lookup(struct inode *dir, const char *__name,
            int len, struct inode **result);
 
static int
 smb_create(struct inode *dir, const char *name, int len, int mode,
            struct inode **result);
 
static int
 smb_mkdir(struct inode *dir, const char *name, int len, int mode);
 
static int
 smb_rmdir(struct inode *dir, const char *name, int len);
 
static int
 smb_unlink(struct inode *dir, const char *name, int len);
 
static int
 smb_rename(struct inode *old_dir, const char *old_name, int old_len,
            struct inode *new_dir, const char *new_name, int new_len,
            int must_be_dir);
 
static struct file_operations smb_dir_operations =
{
        NULL,                   /* lseek - default */
        smb_dir_read,           /* read - bad */
        NULL,                   /* write - bad */
        smb_readdir,            /* readdir */
        NULL,                   /* select - default */
        smb_ioctl,              /* ioctl - default */
        NULL,                   /* mmap */
        NULL,                   /* no special open code */
        NULL,                   /* no special release code */
        NULL                    /* fsync */
};
 
struct inode_operations smb_dir_inode_operations =
{
        &smb_dir_operations,    /* default directory file ops */
        smb_create,             /* create */
        smb_lookup,             /* lookup */
        NULL,                   /* link */
        smb_unlink,             /* unlink */
        NULL,                   /* symlink */
        smb_mkdir,              /* mkdir */
        smb_rmdir,              /* rmdir */
        NULL,                   /* mknod */
        smb_rename,             /* rename */
        NULL,                   /* readlink */
        NULL,                   /* follow_link */
        NULL,                   /* readpage */
        NULL,                   /* writepage */
        NULL,                   /* bmap */
        NULL,                   /* truncate */
        NULL,                   /* permission */
        NULL                    /* smap */
};
 
static int
strncasecmp(const char *s1, const char *s2, int len)
{
        int result = 0;
 
        for (; len > 0; len -= 1)
        {
                char c1, c2;
 
                c1 = (*s1 >= 'a' && *s1 <= 'z') ? *s1 - ('a' - 'A') : *s1;
                c2 = (*s2 >= 'a' && *s2 <= 'z') ? *s2 - ('a' - 'A') : *s2;
                s1 += 1;
                s2 += 1;
 
                if ((result = c1 - c2) != 0 || c1 == 0)
                {
                        return result;
                }
        }
        return result;
}
 
struct smb_inode_info *
smb_find_inode(struct smb_server *server, ino_t ino)
{
        struct smb_inode_info *root = &(server->root);
        struct smb_inode_info *this = root;
 
        do
        {
                if (ino == smb_info_ino(this))
                {
                        return this;
                }
                this = this->next;
        }
        while (this != root);
 
        return NULL;
}
 
static ino_t
smb_fresh_inodes(struct smb_server *server, int no)
{
        static ino_t seed = 1;
        struct smb_inode_info *root = &(server->root);
        struct smb_inode_info *this;
 
      retry:
        if (seed + no <= no)
        {
                /* avoid inode number of 0 at wrap-around */
                seed += no;
        }
        this = root;
        do
        {
                /* We assume that ino_t is unsigned! */
                if (this->finfo.f_ino - seed < no)
                {
                        seed += no;
                        goto retry;
                }
                this = this->next;
        }
        while (this != root);
 
        seed += no;
 
        return seed - no;
}
 
static int
smb_dir_read(struct inode *inode, struct file *filp, char *buf, int count)
{
        return -EISDIR;
}
 
 
static unsigned long c_ino = 0;
static kdev_t c_dev;
static int c_size;
static int c_seen_eof;
static int c_last_returned_index;
static struct smb_dirent *c_entry = NULL;
 
static struct smb_dirent *
smb_search_in_cache(struct inode *dir, unsigned long f_pos)
{
        int i;
 
        if ((dir->i_dev != c_dev) || (dir->i_ino != c_ino))
        {
                return NULL;
        }
        for (i = 0; i < c_size; i++)
        {
                if (f_pos == c_entry[i].f_pos)
                {
                        c_last_returned_index = i;
                        return &(c_entry[i]);
                }
        }
        return NULL;
}
 
static int
smb_refill_dir_cache(struct smb_server *server, struct inode *dir,
                     unsigned long f_pos)
{
        int result;
        static struct semaphore sem = MUTEX;
        int i;
        ino_t ino;
 
        do
        {
                down(&sem);
                result = smb_proc_readdir(server, dir, f_pos,
                                          SMB_READDIR_CACHE_SIZE, c_entry);
 
                if (result <= 0)
                {
                        smb_invalid_dir_cache(dir->i_ino);
                        up(&sem);
                        return result;
                }
                c_seen_eof = (result < SMB_READDIR_CACHE_SIZE);
                c_dev = dir->i_dev;
                c_ino = dir->i_ino;
                c_size = result;
                c_last_returned_index = 0;
 
                ino = smb_fresh_inodes(server, c_size);
                for (i = 0; i < c_size; i++)
                {
                        c_entry[i].f_ino = ino;
                        ino += 1;
                }
 
                up(&sem);
 
        }
        while ((c_dev != dir->i_dev) || (c_ino != dir->i_ino));
 
        return result;
}
 
static int
smb_readdir(struct inode *dir, struct file *filp,
            void *dirent, filldir_t filldir)
{
        int result, i = 0;
        struct smb_dirent *entry = NULL;
        struct smb_server *server = SMB_SERVER(dir);
 
        DPRINTK("smb_readdir: filp->f_pos = %d\n", (int) filp->f_pos);
        DDPRINTK("smb_readdir: dir->i_ino = %ld, c_ino = %ld\n",
                 dir->i_ino, c_ino);
 
        if ((dir == NULL) || !S_ISDIR(dir->i_mode))
        {
                printk("smb_readdir: dir is NULL or not a directory\n");
                return -EBADF;
        }
        if (c_entry == NULL)
        {
                i = sizeof(struct smb_dirent) * SMB_READDIR_CACHE_SIZE;
                c_entry = (struct smb_dirent *) smb_vmalloc(i);
                if (c_entry == NULL)
                {
                        printk("smb_readdir: no MEMORY for cache\n");
                        return -ENOMEM;
                }
        }
        if (filp->f_pos == 0)
        {
                c_ino = 0;
                c_dev = 0;
                c_seen_eof = 0;
 
                if (filldir(dirent, ".", 1, filp->f_pos,
                            smb_info_ino(SMB_INOP(dir))) < 0)
                {
                        return 0;
                }
                filp->f_pos += 1;
        }
        if (filp->f_pos == 1)
        {
                if (filldir(dirent, "..", 2, filp->f_pos,
                            smb_info_ino(SMB_INOP(dir)->dir)) < 0)
                {
                        return 0;
                }
                filp->f_pos += 1;
        }
        entry = smb_search_in_cache(dir, filp->f_pos);
 
        if (entry == NULL)
        {
                if (c_seen_eof)
                {
                        /* End of directory */
                        return 0;
                }
                result = smb_refill_dir_cache(server, dir, filp->f_pos);
                if (result <= 0)
                {
                        return result;
                }
                entry = c_entry;
        }
        while (entry < &(c_entry[c_size]))
        {
                /* We found it.  For getwd(), we have to return the
                   correct inode in d_ino if the inode is currently in
                   use. Otherwise the inode number does not
                   matter. (You can argue a lot about this..) */
 
                struct smb_inode_info *ino_info
                = smb_find_dir_inode(dir, entry->name, entry->len);
 
                ino_t ino = entry->f_ino;
 
                if (ino_info != NULL)
                {
                        ino = smb_info_ino(ino_info);
                }
                DDPRINTK("smb_readdir: entry->name = %s\n", entry->name);
                DDPRINTK("smb_readdir: entry->f_pos = %ld\n", entry->f_pos);
 
                if (filldir(dirent, entry->name, strlen(entry->name),
                            entry->f_pos, ino) < 0)
                {
                        break;
                }
                if ((dir->i_dev != c_dev) || (dir->i_ino != c_ino)
                    || (entry->f_pos != filp->f_pos))
                {
                        /* Someone has destroyed the cache while we slept
                           in filldir */
                        break;
                }
                filp->f_pos += 1;
                entry += 1;
        }
        return 0;
}
 
void
smb_init_dir_cache(void)
{
        c_ino = 0;
        c_dev = 0;
        c_entry = NULL;
}
 
void
smb_invalid_dir_cache(unsigned long ino)
{
        /* TODO: check for dev as well */
        if (ino == c_ino)
        {
                c_ino = 0;
                c_seen_eof = 0;
        }
}
 
void
smb_free_dir_cache(void)
{
        if (c_entry != NULL)
        {
                smb_vfree(c_entry);
        }
        c_entry = NULL;
}
 
/* Insert a NEW smb_inode_info into the inode tree of our filesystem,
   under dir. The caller must assure that it's not already there. We
   assume that path is allocated for us. */
 
static struct inode *
smb_iget(struct inode *dir, struct smb_inode_info *new_inode_info)
{
        struct inode *inode;
        struct smb_inode_info *root;
 
        if ((dir == NULL) || (new_inode_info == NULL))
        {
                printk("smb_iget: parameter is NULL\n");
                return NULL;
        }
        new_inode_info->state = SMB_INODE_LOOKED_UP;
        new_inode_info->nused = 0;
        new_inode_info->dir = SMB_INOP(dir);
 
        SMB_INOP(dir)->nused += 1;
 
        /*
         * We have to link the new inode_info into the doubly linked
         * list of inode_infos to make a complete linear search possible.
         */
        root = &(SMB_SERVER(dir)->root);
 
        new_inode_info->prev = root;
        new_inode_info->next = root->next;
        root->next->prev = new_inode_info;
        root->next = new_inode_info;
 
        if (!(inode = iget(dir->i_sb, smb_info_ino(new_inode_info))))
        {
                printk("smb_iget: iget failed!");
                /*
                 * If we blocked in iget(), another task may have referenced
                 * the info structure ... clean up with smb_free_inode_info.
                 */
                smb_free_inode_info(new_inode_info);
                return NULL;
        }
 
        return inode;
}
 
void
smb_free_inode_info(struct smb_inode_info *i)
{
        if (i == NULL)
        {
                printk("smb_free_inode: i == NULL\n");
                return;
        }
        i->state = SMB_INODE_CACHED;
        while ((i->nused == 0) && (i->state == SMB_INODE_CACHED))
        {
                struct smb_inode_info *dir = i->dir;
 
                i->next->prev = i->prev;
                i->prev->next = i->next;
 
                smb_kfree_s(i, sizeof(struct smb_inode_info));
 
                if (dir == NULL)
                {
                        return;
                }
                dir->nused -= 1;
                i = dir;
        }
}
 
void
smb_init_root(struct smb_server *server)
{
        struct smb_inode_info *root = &(server->root);
 
        root->state = SMB_INODE_LOOKED_UP;
        root->nused = 1;
        root->dir = NULL;
        root->next = root->prev = root;
 
        return;
}
 
void
smb_free_all_inodes(struct smb_server *server)
{
        /* Here nothing should be to do. I do not know whether it's
           better to leave some memory allocated or be stuck in an
           endless loop */
#if 1
        struct smb_inode_info *root = &(server->root);
 
        if (root->next != root)
        {
                printk("smb_free_all_inodes: INODES LEFT!!!\n");
        }
        while (root->next != root)
        {
                printk("smb_free_all_inodes: freeing inode\n");
                smb_free_inode_info(root->next);
                /* In case we have an endless loop.. */
                schedule();
        }
#endif
 
        return;
}
 
/* This has to be called when a connection has gone down, so that all
   file-handles we got from the server are invalid */
void
smb_invalidate_all_inodes(struct smb_server *server)
{
        struct smb_inode_info *ino = &(server->root);
 
        do
        {
                ino->finfo.opened = 0;
                ino = ino->next;
        }
        while (ino != &(server->root));
 
        return;
}
 
static int
compare_filename(const struct smb_server *server,
                 const char *s1, int len, struct smb_dirent *entry)
{
        if (len != entry->len)
        {
#if 0
                /* Check whether the entry is about to be removed */
                if (!entry->len)
                        printk("SMBFS: dead entry %s\n", entry->name);
#endif
                return 1;
        }
        if (server->case_handling == CASE_DEFAULT)
        {
                return strncasecmp(s1, entry->name, len);
        }
        return strncmp(s1, entry->name, len);
}
 
/*
 * Search for the smb_inode_info that belongs to this name,
 * currently by a complete linear search through the inodes
 * belonging to this filesystem.
 *
 * Note that this returns files as well as directories.
 */
static struct smb_inode_info *
smb_find_dir_inode(struct inode *parent, const char *name, int len)
{
        struct smb_server *server = SMB_SERVER(parent);
        struct smb_inode_info *dir = SMB_INOP(parent);
        struct smb_inode_info *result = &(server->root);
 
        if (name == NULL)
        {
                return NULL;
        }
        if ((len == 1) && (name[0] == '.'))
        {
                return dir;
        }
        if ((len == 2) && (name[0] == '.') && (name[1] == '.'))
        {
                return dir->dir;
        }
        do
        {
                if (result->dir == dir)
                {
                        if (compare_filename(server, name, len,
                                             &(result->finfo)) == 0)
                        {
                                return result;
                        }
                }
                result = result->next;
        }
        while (result != &(server->root));
 
        return NULL;
}
 
static int
smb_lookup(struct inode *dir, const char *name, int len,
           struct inode **result)
{
        struct smb_dirent finfo;
        struct smb_inode_info *result_info;
        int error;
        int found_in_cache;
 
        struct smb_inode_info *new_inode_info = NULL;
 
        *result = NULL;
 
        if (!dir || !S_ISDIR(dir->i_mode))
        {
                printk("smb_lookup: inode is NULL or not a directory.\n");
                iput(dir);
                return -ENOENT;
        }
        DDPRINTK("smb_lookup: %s\n", name);
 
        /* Fast cheat for . */
        if (len == 0 || (len == 1 && name[0] == '.'))
        {
                *result = dir;
                return 0;
        }
        /* ..and for .. */
        if (len == 2 && name[0] == '.' && name[1] == '.')
        {
                struct smb_inode_info *parent = SMB_INOP(dir)->dir;
 
                if (parent->state == SMB_INODE_CACHED)
                {
                        parent->state = SMB_INODE_LOOKED_UP;
                }
                *result = iget(dir->i_sb, smb_info_ino(parent));
                iput(dir);
                if (*result == 0)
                {
                        return -EACCES;
                }
                return 0;
        }
        result_info = smb_find_dir_inode(dir, name, len);
 
      in_tree:
        if (result_info != NULL)
        {
                if (result_info->state == SMB_INODE_CACHED)
                {
                        result_info->state = SMB_INODE_LOOKED_UP;
                }
                *result = iget(dir->i_sb, smb_info_ino(result_info));
                iput(dir);
 
                if (new_inode_info != NULL)
                {
                        smb_kfree_s(new_inode_info,
                                    sizeof(struct smb_inode_info));
                }
                if (*result == NULL)
                {
                        return -EACCES;
                }
                return 0;
        }
        /* If the file is in the dir cache, we do not have to ask the
           server. */
        found_in_cache = 0;
 
        if ((dir->i_dev == c_dev) && (dir->i_ino == c_ino) && (c_size != 0))
        {
                int first = c_last_returned_index;
                int i;
 
                i = first;
                do
                {
                        if (compare_filename(SMB_SERVER(dir), name, len,
                                             &(c_entry[i])) == 0)
                        {
                                finfo = c_entry[i];
                                found_in_cache = 1;
                                break;
                        }
                        i = (i + 1) % c_size;
                }
                while (i != first);
        }
        if (found_in_cache == 0)
        {
                DPRINTK("smb_lookup: not found in cache: %s\n", name);
                if (len > SMB_MAXNAMELEN)
                {
                        iput(dir);
                        return -ENAMETOOLONG;
                }
                error = smb_proc_getattr(dir, name, len, &finfo);
                if (error < 0)
                {
                        iput(dir);
                        return error;
                }
                finfo.f_ino = smb_fresh_inodes(SMB_SERVER(dir), 1);
        }
        new_inode_info = smb_kmalloc(sizeof(struct smb_inode_info),
                                     GFP_KERNEL);
 
        /* Here somebody else might have inserted the inode */
 
        result_info = smb_find_dir_inode(dir, name, len);
        if (result_info != NULL)
        {
                goto in_tree;
        }
 
        if (new_inode_info == NULL)
        {
                iput(dir);
                return -ENOMEM;
        }
        new_inode_info->finfo = finfo;
 
        DPRINTK("attr: %x\n", finfo.attr);
 
        if ((*result = smb_iget(dir, new_inode_info)) == NULL)
        {
                iput(dir);
                return -EACCES;
        }
        DDPRINTK("smb_lookup: %s => %lu\n", name, (unsigned long) result_info);
        iput(dir);
        return 0;
}
 
static int
smb_create(struct inode *dir, const char *name, int len, int mode,
           struct inode **result)
{
        int error;
        struct smb_dirent entry;
        struct smb_inode_info *new_inode_info;
 
        *result = NULL;
 
        if (!dir || !S_ISDIR(dir->i_mode))
        {
                printk("smb_create: inode is NULL or not a directory\n");
                iput(dir);
                return -ENOENT;
        }
        new_inode_info = smb_kmalloc(sizeof(struct smb_inode_info),
                                     GFP_KERNEL);
        if (new_inode_info == NULL)
        {
                iput(dir);
                return -ENOMEM;
        }
        error = smb_proc_create(dir, name, len, 0, CURRENT_TIME);
        if (error < 0)
        {
                smb_kfree_s(new_inode_info, sizeof(struct smb_inode_info));
                iput(dir);
                return error;
        }
        smb_invalid_dir_cache(dir->i_ino);
 
        if ((error = smb_proc_getattr(dir, name, len, &entry)) < 0)
        {
                smb_kfree_s(new_inode_info, sizeof(struct smb_inode_info));
                iput(dir);
                return error;
        }
        entry.f_ino = smb_fresh_inodes(SMB_SERVER(dir), 1);
 
        new_inode_info->finfo = entry;
 
        if ((*result = smb_iget(dir, new_inode_info)) == NULL)
        {
                iput(dir);
                return error;
        }
        iput(dir);
        return 0;
}
 
static int
smb_mkdir(struct inode *dir, const char *name, int len, int mode)
{
        int error;
 
        if (!dir || !S_ISDIR(dir->i_mode))
        {
                iput(dir);
                return -EINVAL;
        }
        if ((error = smb_proc_mkdir(dir, name, len)) == 0)
        {
                smb_invalid_dir_cache(dir->i_ino);
        }
        iput(dir);
        return error;
}
 
static int
smb_rmdir(struct inode *dir, const char *name, int len)
{
        int error;
 
        if (!dir || !S_ISDIR(dir->i_mode))
        {
                printk("smb_rmdir: inode is NULL or not a directory\n");
                iput(dir);
                return -ENOENT;
        }
        if (smb_find_dir_inode(dir, name, len) != NULL)
        {
                error = -EBUSY;
        } else
        {
                if ((error = smb_proc_rmdir(dir, name, len)) == 0)
                {
                        smb_invalid_dir_cache(dir->i_ino);
                }
        }
        iput(dir);
        return error;
}
 
static int
smb_unlink(struct inode *dir, const char *name, int len)
{
        int error;
 
        if (!dir || !S_ISDIR(dir->i_mode))
        {
                printk("smb_unlink: inode is NULL or not a directory\n");
                iput(dir);
                return -ENOENT;
        }
        if (smb_find_dir_inode(dir, name, len) != NULL)
        {
                error = -EBUSY;
        } else
        {
                if ((error = smb_proc_unlink(dir, name, len)) == 0)
                {
                        smb_invalid_dir_cache(dir->i_ino);
                }
        }
        iput(dir);
        return error;
}
 
static int
smb_rename(struct inode *old_dir, const char *old_name, int old_len,
           struct inode *new_dir, const char *new_name, int new_len,
           int must_be_dir)
{
        int res;
 
        if (!old_dir || !S_ISDIR(old_dir->i_mode))
        {
                printk("smb_rename: old inode is NULL or not a directory\n");
                res = -ENOENT;
                goto finished;
        }
        if (!new_dir || !S_ISDIR(new_dir->i_mode))
        {
                printk("smb_rename: new inode is NULL or not a directory\n");
                res = -ENOENT;
                goto finished;
        }
        if ((smb_find_dir_inode(old_dir, old_name, old_len) != NULL)
            || (smb_find_dir_inode(new_dir, new_name, new_len) != NULL))
        {
                res = -EBUSY;
                goto finished;
        }
        res = smb_proc_mv(old_dir, old_name, old_len,
                          new_dir, new_name, new_len);
 
        if (res == -EEXIST)
        {
                int res1 = smb_proc_unlink(old_dir, new_name, new_len);
 
                if (res1 == 0)
                {
                        res = smb_proc_mv(old_dir, old_name, old_len,
                                          new_dir, new_name, new_len);
                }
        }
        if (res == 0)
        {
                smb_invalid_dir_cache(old_dir->i_ino);
                smb_invalid_dir_cache(new_dir->i_ino);
        }
      finished:
        iput(old_dir);
        iput(new_dir);
        return res;
}

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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [fs/] [smbfs/] [dir.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	199	simons	`/*`
2			`* dir.c`
3			`*`
4			`* Copyright (C) 1995, 1996 by Paal-Kr. Engstad and Volker Lendecke`
5			`*`
6			`*/`
7
8			`#include <linux/sched.h>`
9			`#include <linux/errno.h>`
10			`#include <linux/stat.h>`
11			`#include <linux/kernel.h>`
12			`#include <linux/malloc.h>`
13			`#include <linux/mm.h>`
14			`#include <linux/smb_fs.h>`
15			`#include <linux/smbno.h>`
16			`#include <asm/segment.h>`
17			`#include <asm/semaphore.h>`
18			`#include <linux/errno.h>`
19
20			`static int`
21			`smb_dir_read(struct inode inode, struct file filp, char *buf, int count);`
22
23			`static int`
24			`smb_readdir(struct inode inode, struct file filp,`
25			`void *dirent, filldir_t filldir);`
26
27			`static struct smb_inode_info *`
28			`smb_find_dir_inode(struct inode parent, const char name, int len);`
29
30			`static int`
31			`smb_lookup(struct inode dir, const char __name,`
32			`int len, struct inode **result);`
33
34			`static int`
35			`smb_create(struct inode dir, const char name, int len, int mode,`
36			`struct inode **result);`
37
38			`static int`
39			`smb_mkdir(struct inode dir, const char name, int len, int mode);`
40
41			`static int`
42			`smb_rmdir(struct inode dir, const char name, int len);`
43
44			`static int`
45			`smb_unlink(struct inode dir, const char name, int len);`
46
47			`static int`
48			`smb_rename(struct inode old_dir, const char old_name, int old_len,`
49			`struct inode new_dir, const char new_name, int new_len,`
50			`int must_be_dir);`
51
52			`static struct file_operations smb_dir_operations =`
53			`{`
54			`NULL, /* lseek - default */`
55			`smb_dir_read, /* read - bad */`
56			`NULL, /* write - bad */`
57			`smb_readdir, /* readdir */`
58			`NULL, /* select - default */`
59			`smb_ioctl, /* ioctl - default */`
60			`NULL, /* mmap */`
61			`NULL, /* no special open code */`
62			`NULL, /* no special release code */`
63			`NULL /* fsync */`
64			`};`
65
66			`struct inode_operations smb_dir_inode_operations =`
67			`{`
68			`&smb_dir_operations, /* default directory file ops */`
69			`smb_create, /* create */`
70			`smb_lookup, /* lookup */`
71			`NULL, /* link */`
72			`smb_unlink, /* unlink */`
73			`NULL, /* symlink */`
74			`smb_mkdir, /* mkdir */`
75			`smb_rmdir, /* rmdir */`
76			`NULL, /* mknod */`
77			`smb_rename, /* rename */`
78			`NULL, /* readlink */`
79			`NULL, /* follow_link */`
80			`NULL, /* readpage */`
81			`NULL, /* writepage */`
82			`NULL, /* bmap */`
83			`NULL, /* truncate */`
84			`NULL, /* permission */`
85			`NULL /* smap */`
86			`};`
87
88			`static int`
89			`strncasecmp(const char s1, const char s2, int len)`
90			`{`
91			`int result = 0;`
92
93			`for (; len > 0; len -= 1)`
94			`{`
95			`char c1, c2;`
96
97			`c1 = (s1 >= 'a' && s1 <= 'z') ? s1 - ('a' - 'A') : s1;`
98			`c2 = (s2 >= 'a' && s2 <= 'z') ? s2 - ('a' - 'A') : s2;`
99			`s1 += 1;`
100			`s2 += 1;`
101
102			`if ((result = c1 - c2) != 0 \|\| c1 == 0)`
103			`{`
104			`return result;`
105			`}`
106			`}`
107			`return result;`
108			`}`
109
110			`struct smb_inode_info *`
111			`smb_find_inode(struct smb_server *server, ino_t ino)`
112			`{`
113			`struct smb_inode_info *root = &(server->root);`
114			`struct smb_inode_info *this = root;`
115
116			`do`
117			`{`
118			`if (ino == smb_info_ino(this))`
119			`{`
120			`return this;`
121			`}`
122			`this = this->next;`
123			`}`
124			`while (this != root);`
125
126			`return NULL;`
127			`}`
128
129			`static ino_t`
130			`smb_fresh_inodes(struct smb_server *server, int no)`
131			`{`
132			`static ino_t seed = 1;`
133			`struct smb_inode_info *root = &(server->root);`
134			`struct smb_inode_info *this;`
135
136			`retry:`
137			`if (seed + no <= no)`
138			`{`
139			`/* avoid inode number of 0 at wrap-around */`
140			`seed += no;`
141			`}`
142			`this = root;`
143			`do`
144			`{`
145			`/* We assume that ino_t is unsigned! */`
146			`if (this->finfo.f_ino - seed < no)`
147			`{`
148			`seed += no;`
149			`goto retry;`
150			`}`
151			`this = this->next;`
152			`}`
153			`while (this != root);`
154
155			`seed += no;`
156
157			`return seed - no;`
158			`}`
159
160			`static int`
161			`smb_dir_read(struct inode inode, struct file filp, char *buf, int count)`
162			`{`
163			`return -EISDIR;`
164			`}`
165
166
167			`static unsigned long c_ino = 0;`
168			`static kdev_t c_dev;`
169			`static int c_size;`
170			`static int c_seen_eof;`
171			`static int c_last_returned_index;`
172			`static struct smb_dirent *c_entry = NULL;`
173
174			`static struct smb_dirent *`
175			`smb_search_in_cache(struct inode *dir, unsigned long f_pos)`
176			`{`
177			`int i;`
178
179			`if ((dir->i_dev != c_dev) \|\| (dir->i_ino != c_ino))`
180			`{`
181			`return NULL;`
182			`}`
183			`for (i = 0; i < c_size; i++)`
184			`{`
185			`if (f_pos == c_entry[i].f_pos)`
186			`{`
187			`c_last_returned_index = i;`
188			`return &(c_entry[i]);`
189			`}`
190			`}`
191			`return NULL;`
192			`}`
193
194			`static int`
195			`smb_refill_dir_cache(struct smb_server server, struct inode dir,`
196			`unsigned long f_pos)`
197			`{`
198			`int result;`
199			`static struct semaphore sem = MUTEX;`
200			`int i;`
201			`ino_t ino;`
202
203			`do`
204			`{`
205			`down(&sem);`
206			`result = smb_proc_readdir(server, dir, f_pos,`
207			`SMB_READDIR_CACHE_SIZE, c_entry);`
208
209			`if (result <= 0)`
210			`{`
211			`smb_invalid_dir_cache(dir->i_ino);`
212			`up(&sem);`
213			`return result;`
214			`}`
215			`c_seen_eof = (result < SMB_READDIR_CACHE_SIZE);`
216			`c_dev = dir->i_dev;`
217			`c_ino = dir->i_ino;`
218			`c_size = result;`
219			`c_last_returned_index = 0;`
220
221			`ino = smb_fresh_inodes(server, c_size);`
222			`for (i = 0; i < c_size; i++)`
223			`{`
224			`c_entry[i].f_ino = ino;`
225			`ino += 1;`
226			`}`
227
228			`up(&sem);`
229
230			`}`
231			`while ((c_dev != dir->i_dev) \|\| (c_ino != dir->i_ino));`
232
233			`return result;`
234			`}`
235
236			`static int`
237			`smb_readdir(struct inode dir, struct file filp,`
238			`void *dirent, filldir_t filldir)`
239			`{`
240			`int result, i = 0;`
241			`struct smb_dirent *entry = NULL;`
242			`struct smb_server *server = SMB_SERVER(dir);`
243
244			`DPRINTK("smb_readdir: filp->f_pos = %d\n", (int) filp->f_pos);`
245			`DDPRINTK("smb_readdir: dir->i_ino = %ld, c_ino = %ld\n",`
246			`dir->i_ino, c_ino);`
247
248			`if ((dir == NULL) \|\| !S_ISDIR(dir->i_mode))`
249			`{`
250			`printk("smb_readdir: dir is NULL or not a directory\n");`
251			`return -EBADF;`
252			`}`
253			`if (c_entry == NULL)`
254			`{`
255			`i = sizeof(struct smb_dirent) * SMB_READDIR_CACHE_SIZE;`
256			`c_entry = (struct smb_dirent *) smb_vmalloc(i);`
257			`if (c_entry == NULL)`
258			`{`
259			`printk("smb_readdir: no MEMORY for cache\n");`
260			`return -ENOMEM;`
261			`}`
262			`}`
263			`if (filp->f_pos == 0)`
264			`{`
265			`c_ino = 0;`
266			`c_dev = 0;`
267			`c_seen_eof = 0;`
268
269			`if (filldir(dirent, ".", 1, filp->f_pos,`
270			`smb_info_ino(SMB_INOP(dir))) < 0)`
271			`{`
272			`return 0;`
273			`}`
274			`filp->f_pos += 1;`
275			`}`
276			`if (filp->f_pos == 1)`
277			`{`
278			`if (filldir(dirent, "..", 2, filp->f_pos,`
279			`smb_info_ino(SMB_INOP(dir)->dir)) < 0)`
280			`{`
281			`return 0;`
282			`}`
283			`filp->f_pos += 1;`
284			`}`
285			`entry = smb_search_in_cache(dir, filp->f_pos);`
286
287			`if (entry == NULL)`
288			`{`
289			`if (c_seen_eof)`
290			`{`
291			`/* End of directory */`
292			`return 0;`
293			`}`
294			`result = smb_refill_dir_cache(server, dir, filp->f_pos);`
295			`if (result <= 0)`
296			`{`
297			`return result;`
298			`}`
299			`entry = c_entry;`
300			`}`
301			`while (entry < &(c_entry[c_size]))`
302			`{`
303			`/* We found it. For getwd(), we have to return the`
304			`correct inode in d_ino if the inode is currently in`
305			`use. Otherwise the inode number does not`
306			`matter. (You can argue a lot about this..) */`
307
308			`struct smb_inode_info *ino_info`
309			`= smb_find_dir_inode(dir, entry->name, entry->len);`
310
311			`ino_t ino = entry->f_ino;`
312
313			`if (ino_info != NULL)`
314			`{`
315			`ino = smb_info_ino(ino_info);`
316			`}`
317			`DDPRINTK("smb_readdir: entry->name = %s\n", entry->name);`
318			`DDPRINTK("smb_readdir: entry->f_pos = %ld\n", entry->f_pos);`
319
320			`if (filldir(dirent, entry->name, strlen(entry->name),`
321			`entry->f_pos, ino) < 0)`
322			`{`
323			`break;`
324			`}`
325			`if ((dir->i_dev != c_dev) \|\| (dir->i_ino != c_ino)`
326			`\|\| (entry->f_pos != filp->f_pos))`
327			`{`
328			`/* Someone has destroyed the cache while we slept`
329			`in filldir */`
330			`break;`
331			`}`
332			`filp->f_pos += 1;`
333			`entry += 1;`
334			`}`
335			`return 0;`
336			`}`
337
338			`void`
339			`smb_init_dir_cache(void)`
340			`{`
341			`c_ino = 0;`
342			`c_dev = 0;`
343			`c_entry = NULL;`
344			`}`
345
346			`void`
347			`smb_invalid_dir_cache(unsigned long ino)`
348			`{`
349			`/* TODO: check for dev as well */`
350			`if (ino == c_ino)`
351			`{`
352			`c_ino = 0;`
353			`c_seen_eof = 0;`
354			`}`
355			`}`
356
357			`void`
358			`smb_free_dir_cache(void)`
359			`{`
360			`if (c_entry != NULL)`
361			`{`
362			`smb_vfree(c_entry);`
363			`}`
364			`c_entry = NULL;`
365			`}`
366
367			`/* Insert a NEW smb_inode_info into the inode tree of our filesystem,`
368			`under dir. The caller must assure that it's not already there. We`
369			`assume that path is allocated for us. */`
370
371			`static struct inode *`
372			`smb_iget(struct inode dir, struct smb_inode_info new_inode_info)`
373			`{`
374			`struct inode *inode;`
375			`struct smb_inode_info *root;`
376
377			`if ((dir == NULL) \|\| (new_inode_info == NULL))`
378			`{`
379			`printk("smb_iget: parameter is NULL\n");`
380			`return NULL;`
381			`}`
382			`new_inode_info->state = SMB_INODE_LOOKED_UP;`
383			`new_inode_info->nused = 0;`
384			`new_inode_info->dir = SMB_INOP(dir);`
385
386			`SMB_INOP(dir)->nused += 1;`
387
388			`/*`
389			`* We have to link the new inode_info into the doubly linked`
390			`* list of inode_infos to make a complete linear search possible.`
391			`*/`
392			`root = &(SMB_SERVER(dir)->root);`
393
394			`new_inode_info->prev = root;`
395			`new_inode_info->next = root->next;`
396			`root->next->prev = new_inode_info;`
397			`root->next = new_inode_info;`
398
399			`if (!(inode = iget(dir->i_sb, smb_info_ino(new_inode_info))))`
400			`{`
401			`printk("smb_iget: iget failed!");`
402			`/*`
403			`* If we blocked in iget(), another task may have referenced`
404			`* the info structure ... clean up with smb_free_inode_info.`
405			`*/`
406			`smb_free_inode_info(new_inode_info);`
407			`return NULL;`
408			`}`
409
410			`return inode;`
411			`}`
412
413			`void`
414			`smb_free_inode_info(struct smb_inode_info *i)`
415			`{`
416			`if (i == NULL)`
417			`{`
418			`printk("smb_free_inode: i == NULL\n");`
419			`return;`
420			`}`
421			`i->state = SMB_INODE_CACHED;`
422			`while ((i->nused == 0) && (i->state == SMB_INODE_CACHED))`
423			`{`
424			`struct smb_inode_info *dir = i->dir;`
425
426			`i->next->prev = i->prev;`
427			`i->prev->next = i->next;`
428
429			`smb_kfree_s(i, sizeof(struct smb_inode_info));`
430
431			`if (dir == NULL)`
432			`{`
433			`return;`
434			`}`
435			`dir->nused -= 1;`
436			`i = dir;`
437			`}`
438			`}`
439
440			`void`
441			`smb_init_root(struct smb_server *server)`
442			`{`
443			`struct smb_inode_info *root = &(server->root);`
444
445			`root->state = SMB_INODE_LOOKED_UP;`
446			`root->nused = 1;`
447			`root->dir = NULL;`
448			`root->next = root->prev = root;`
449
450			`return;`
451			`}`
452
453			`void`
454			`smb_free_all_inodes(struct smb_server *server)`
455			`{`
456			`/* Here nothing should be to do. I do not know whether it's`
457			`better to leave some memory allocated or be stuck in an`
458			`endless loop */`
459			`#if 1`
460			`struct smb_inode_info *root = &(server->root);`
461
462			`if (root->next != root)`
463			`{`
464			`printk("smb_free_all_inodes: INODES LEFT!!!\n");`
465			`}`
466			`while (root->next != root)`
467			`{`
468			`printk("smb_free_all_inodes: freeing inode\n");`
469			`smb_free_inode_info(root->next);`
470			`/* In case we have an endless loop.. */`
471			`schedule();`
472			`}`
473			`#endif`
474
475			`return;`
476			`}`
477
478			`/* This has to be called when a connection has gone down, so that all`
479			`file-handles we got from the server are invalid */`
480			`void`
481			`smb_invalidate_all_inodes(struct smb_server *server)`
482			`{`
483			`struct smb_inode_info *ino = &(server->root);`
484
485			`do`
486			`{`
487			`ino->finfo.opened = 0;`
488			`ino = ino->next;`
489			`}`
490			`while (ino != &(server->root));`
491
492			`return;`
493			`}`
494
495			`static int`
496			`compare_filename(const struct smb_server *server,`
497			`const char s1, int len, struct smb_dirent entry)`
498			`{`
499			`if (len != entry->len)`
500			`{`
501			`#if 0`
502			`/* Check whether the entry is about to be removed */`
503			`if (!entry->len)`
504			`printk("SMBFS: dead entry %s\n", entry->name);`
505			`#endif`
506			`return 1;`
507			`}`
508			`if (server->case_handling == CASE_DEFAULT)`
509			`{`
510			`return strncasecmp(s1, entry->name, len);`
511			`}`
512			`return strncmp(s1, entry->name, len);`
513			`}`
514
515			`/*`
516			`* Search for the smb_inode_info that belongs to this name,`
517			`* currently by a complete linear search through the inodes`
518			`* belonging to this filesystem.`
519			`*`
520			`* Note that this returns files as well as directories.`
521			`*/`
522			`static struct smb_inode_info *`
523			`smb_find_dir_inode(struct inode parent, const char name, int len)`
524			`{`
525			`struct smb_server *server = SMB_SERVER(parent);`
526			`struct smb_inode_info *dir = SMB_INOP(parent);`
527			`struct smb_inode_info *result = &(server->root);`
528
529			`if (name == NULL)`
530			`{`
531			`return NULL;`
532			`}`
533			`if ((len == 1) && (name[0] == '.'))`
534			`{`
535			`return dir;`
536			`}`
537			`if ((len == 2) && (name[0] == '.') && (name[1] == '.'))`
538			`{`
539			`return dir->dir;`
540			`}`
541			`do`
542			`{`
543			`if (result->dir == dir)`
544			`{`
545			`if (compare_filename(server, name, len,`
546			`&(result->finfo)) == 0)`
547			`{`
548			`return result;`
549			`}`
550			`}`
551			`result = result->next;`
552			`}`
553			`while (result != &(server->root));`
554
555			`return NULL;`
556			`}`
557
558			`static int`
559			`smb_lookup(struct inode dir, const char name, int len,`
560			`struct inode **result)`
561			`{`
562			`struct smb_dirent finfo;`
563			`struct smb_inode_info *result_info;`
564			`int error;`
565			`int found_in_cache;`
566
567			`struct smb_inode_info *new_inode_info = NULL;`
568
569			`*result = NULL;`
570
571			`if (!dir \|\| !S_ISDIR(dir->i_mode))`
572			`{`
573			`printk("smb_lookup: inode is NULL or not a directory.\n");`
574			`iput(dir);`
575			`return -ENOENT;`
576			`}`
577			`DDPRINTK("smb_lookup: %s\n", name);`
578
579			`/* Fast cheat for . */`
580			`if (len == 0 \|\| (len == 1 && name[0] == '.'))`
581			`{`
582			`*result = dir;`
583			`return 0;`
584			`}`
585			`/* ..and for .. */`
586			`if (len == 2 && name[0] == '.' && name[1] == '.')`
587			`{`
588			`struct smb_inode_info *parent = SMB_INOP(dir)->dir;`
589
590			`if (parent->state == SMB_INODE_CACHED)`
591			`{`
592			`parent->state = SMB_INODE_LOOKED_UP;`
593			`}`
594			`*result = iget(dir->i_sb, smb_info_ino(parent));`
595			`iput(dir);`
596			`if (*result == 0)`
597			`{`
598			`return -EACCES;`
599			`}`
600			`return 0;`
601			`}`
602			`result_info = smb_find_dir_inode(dir, name, len);`
603
604			`in_tree:`
605			`if (result_info != NULL)`
606			`{`
607			`if (result_info->state == SMB_INODE_CACHED)`
608			`{`
609			`result_info->state = SMB_INODE_LOOKED_UP;`
610			`}`
611			`*result = iget(dir->i_sb, smb_info_ino(result_info));`
612			`iput(dir);`
613
614			`if (new_inode_info != NULL)`
615			`{`
616			`smb_kfree_s(new_inode_info,`
617			`sizeof(struct smb_inode_info));`
618			`}`
619			`if (*result == NULL)`
620			`{`
621			`return -EACCES;`
622			`}`
623			`return 0;`
624			`}`
625			`/* If the file is in the dir cache, we do not have to ask the`
626			`server. */`
627			`found_in_cache = 0;`
628
629			`if ((dir->i_dev == c_dev) && (dir->i_ino == c_ino) && (c_size != 0))`
630			`{`
631			`int first = c_last_returned_index;`
632			`int i;`
633
634			`i = first;`
635			`do`
636			`{`
637			`if (compare_filename(SMB_SERVER(dir), name, len,`
638			`&(c_entry[i])) == 0)`
639			`{`
640			`finfo = c_entry[i];`
641			`found_in_cache = 1;`
642			`break;`
643			`}`
644			`i = (i + 1) % c_size;`
645			`}`
646			`while (i != first);`
647			`}`
648			`if (found_in_cache == 0)`
649			`{`
650			`DPRINTK("smb_lookup: not found in cache: %s\n", name);`
651			`if (len > SMB_MAXNAMELEN)`
652			`{`
653			`iput(dir);`
654			`return -ENAMETOOLONG;`
655			`}`
656			`error = smb_proc_getattr(dir, name, len, &finfo);`
657			`if (error < 0)`
658			`{`
659			`iput(dir);`
660			`return error;`
661			`}`
662			`finfo.f_ino = smb_fresh_inodes(SMB_SERVER(dir), 1);`
663			`}`
664			`new_inode_info = smb_kmalloc(sizeof(struct smb_inode_info),`
665			`GFP_KERNEL);`
666
667			`/* Here somebody else might have inserted the inode */`
668
669			`result_info = smb_find_dir_inode(dir, name, len);`
670			`if (result_info != NULL)`
671			`{`
672			`goto in_tree;`
673			`}`
674
675			`if (new_inode_info == NULL)`
676			`{`
677			`iput(dir);`
678			`return -ENOMEM;`
679			`}`
680			`new_inode_info->finfo = finfo;`
681
682			`DPRINTK("attr: %x\n", finfo.attr);`
683
684			`if ((*result = smb_iget(dir, new_inode_info)) == NULL)`
685			`{`
686			`iput(dir);`
687			`return -EACCES;`
688			`}`
689			`DDPRINTK("smb_lookup: %s => %lu\n", name, (unsigned long) result_info);`
690			`iput(dir);`
691			`return 0;`
692			`}`
693
694			`static int`
695			`smb_create(struct inode dir, const char name, int len, int mode,`
696			`struct inode **result)`
697			`{`
698			`int error;`
699			`struct smb_dirent entry;`
700			`struct smb_inode_info *new_inode_info;`
701
702			`*result = NULL;`
703
704			`if (!dir \|\| !S_ISDIR(dir->i_mode))`
705			`{`
706			`printk("smb_create: inode is NULL or not a directory\n");`
707			`iput(dir);`
708			`return -ENOENT;`
709			`}`
710			`new_inode_info = smb_kmalloc(sizeof(struct smb_inode_info),`
711			`GFP_KERNEL);`
712			`if (new_inode_info == NULL)`
713			`{`
714			`iput(dir);`
715			`return -ENOMEM;`
716			`}`
717			`error = smb_proc_create(dir, name, len, 0, CURRENT_TIME);`
718			`if (error < 0)`
719			`{`
720			`smb_kfree_s(new_inode_info, sizeof(struct smb_inode_info));`
721			`iput(dir);`
722			`return error;`
723			`}`
724			`smb_invalid_dir_cache(dir->i_ino);`
725
726			`if ((error = smb_proc_getattr(dir, name, len, &entry)) < 0)`
727			`{`
728			`smb_kfree_s(new_inode_info, sizeof(struct smb_inode_info));`
729			`iput(dir);`
730			`return error;`
731			`}`
732			`entry.f_ino = smb_fresh_inodes(SMB_SERVER(dir), 1);`
733
734			`new_inode_info->finfo = entry;`
735
736			`if ((*result = smb_iget(dir, new_inode_info)) == NULL)`
737			`{`
738			`iput(dir);`
739			`return error;`
740			`}`
741			`iput(dir);`
742			`return 0;`
743			`}`
744
745			`static int`
746			`smb_mkdir(struct inode dir, const char name, int len, int mode)`
747			`{`
748			`int error;`
749
750			`if (!dir \|\| !S_ISDIR(dir->i_mode))`
751			`{`
752			`iput(dir);`
753			`return -EINVAL;`
754			`}`
755			`if ((error = smb_proc_mkdir(dir, name, len)) == 0)`
756			`{`
757			`smb_invalid_dir_cache(dir->i_ino);`
758			`}`
759			`iput(dir);`
760			`return error;`
761			`}`
762
763			`static int`
764			`smb_rmdir(struct inode dir, const char name, int len)`
765			`{`
766			`int error;`
767
768			`if (!dir \|\| !S_ISDIR(dir->i_mode))`
769			`{`
770			`printk("smb_rmdir: inode is NULL or not a directory\n");`
771			`iput(dir);`
772			`return -ENOENT;`
773			`}`
774			`if (smb_find_dir_inode(dir, name, len) != NULL)`
775			`{`
776			`error = -EBUSY;`
777			`} else`
778			`{`
779			`if ((error = smb_proc_rmdir(dir, name, len)) == 0)`
780			`{`
781			`smb_invalid_dir_cache(dir->i_ino);`
782			`}`
783			`}`
784			`iput(dir);`
785			`return error;`
786			`}`
787
788			`static int`
789			`smb_unlink(struct inode dir, const char name, int len)`
790			`{`
791			`int error;`
792
793			`if (!dir \|\| !S_ISDIR(dir->i_mode))`
794			`{`
795			`printk("smb_unlink: inode is NULL or not a directory\n");`
796			`iput(dir);`
797			`return -ENOENT;`
798			`}`
799			`if (smb_find_dir_inode(dir, name, len) != NULL)`
800			`{`
801			`error = -EBUSY;`
802			`} else`
803			`{`
804			`if ((error = smb_proc_unlink(dir, name, len)) == 0)`
805			`{`
806			`smb_invalid_dir_cache(dir->i_ino);`
807			`}`
808			`}`
809			`iput(dir);`
810			`return error;`
811			`}`
812
813			`static int`
814			`smb_rename(struct inode old_dir, const char old_name, int old_len,`
815			`struct inode new_dir, const char new_name, int new_len,`
816			`int must_be_dir)`
817			`{`
818			`int res;`
819
820			`if (!old_dir \|\| !S_ISDIR(old_dir->i_mode))`
821			`{`
822			`printk("smb_rename: old inode is NULL or not a directory\n");`
823			`res = -ENOENT;`
824			`goto finished;`
825			`}`
826			`if (!new_dir \|\| !S_ISDIR(new_dir->i_mode))`
827			`{`
828			`printk("smb_rename: new inode is NULL or not a directory\n");`
829			`res = -ENOENT;`
830			`goto finished;`
831			`}`
832			`if ((smb_find_dir_inode(old_dir, old_name, old_len) != NULL)`
833			`\|\| (smb_find_dir_inode(new_dir, new_name, new_len) != NULL))`
834			`{`
835			`res = -EBUSY;`
836			`goto finished;`
837			`}`
838			`res = smb_proc_mv(old_dir, old_name, old_len,`
839			`new_dir, new_name, new_len);`
840
841			`if (res == -EEXIST)`
842			`{`
843			`int res1 = smb_proc_unlink(old_dir, new_name, new_len);`
844
845			`if (res1 == 0)`
846			`{`
847			`res = smb_proc_mv(old_dir, old_name, old_len,`
848			`new_dir, new_name, new_len);`
849			`}`
850			`}`
851			`if (res == 0)`
852			`{`
853			`smb_invalid_dir_cache(old_dir->i_ino);`
854			`smb_invalid_dir_cache(new_dir->i_ino);`
855			`}`
856			`finished:`
857			`iput(old_dir);`
858			`iput(new_dir);`
859			`return res;`
860			`}`