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# Tell versions [3.59,3.63) of GNU make to not export all variables.

# Otherwise a system limit (for SysV at least) may be exceeded.

.NOEXPORT:

/*

 * dir.c

 * Copyright (C) 2002 Florin Malita <mali@go.ro>

 *

 * This file is part of LUFS, a free userspace filesystem implementation.

 * See http://lufs.sourceforge.net/ for updates.

 *

 * LUFS is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * LUFS is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

#include <linux/version.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/fs.h>

#include <linux/slab.h>

#include <linux/ctype.h>

#include <linux/socket.h>

#include <asm/uaccess.h>

#include <asm/system.h>

#include <linux/smp_lock.h>

#include "lufs.h"

#include "proc.h"

extern struct inode* lu_iget(struct super_block*, struct lufs_fattr*);

extern int lufs_notify_change(struct dentry*, struct iattr*);

static int lu_readdir(struct file*, void*, filldir_t);

static struct dentry *lu_lookup(struct inode*, struct dentry*);

static int lu_mkdir(struct inode*, struct dentry*, int);

static int lu_create(struct inode*, struct dentry*, int);

static int lu_rmdir(struct inode*, struct dentry*);

static int lu_rename(struct inode*, struct dentry*, struct inode*, struct dentry*);

static int lu_unlink(struct inode*, struct dentry*);

static int lu_link(struct dentry*, struct inode*, struct dentry*);

static int lu_symlink(struct inode*, struct dentry*, const char*);

struct file_operations lu_dir_operations = {

    .read	= generic_read_dir,

    .readdir	= lu_readdir,

};

struct inode_operations lu_dir_inode_operations = {

    .create	= lu_create,

    .lookup	= lu_lookup,

    .link	= lu_link,

    .unlink	= lu_unlink,

    .symlink	= lu_symlink,

    .mkdir	= lu_mkdir,

    .rmdir	= lu_rmdir,

    .rename	= lu_rename,

    .setattr	= lufs_notify_change,

};

static int lu_lookup_validate(struct dentry *dentry, int flags)

{

    struct inode *inode = dentry->d_inode;

    unsigned long age = jiffies - dentry->d_time;

    int res;

    TRACE("in\n");

    res = (age <= LU_MAXAGE);

    TRACE("age: %lu, valid: %d\n", age, res);

    if(!res)

	res = (lu_revalidate_inode(dentry) == 0);

    if(inode){

	lock_kernel();

	if(is_bad_inode(inode))

	    res = 0;

	unlock_kernel();

    }else

	TRACE("no inode?!\n");

    TRACE("out(res=%d)\n", res);

    return res;

}

static int lu_delete_dentry(struct dentry *dentry)

{

    TRACE("in\n");

    if(dentry->d_inode && is_bad_inode(dentry->d_inode)){

	WARN("bad inode, unhashing \n");

    	return 1;

    }

    TRACE("out\n");

    return 0;

}

struct dentry_operations lufs_dentry_operations = {

    .d_revalidate	= lu_lookup_validate,

    .d_delete		= lu_delete_dentry,

};

static int lu_readdir(struct file *f, void *dirent, filldir_t filldir)

{

    int res = -1;

    char *c;

    struct qstr qname;

    unsigned long ino;

    struct iovec siov[2], riov;

    struct server_slot *slot;

    unsigned short offset;

    TRACE("in\n");

    if((slot = lu_getslot(GET_INFO(f->f_dentry->d_sb))) == NULL)

	return -ERESTARTSYS;

    if(lu_getname(f->f_dentry, slot->s_buf, LU_MAXDATA) < 0){

	WARN("lu_getname failed!\n");

	goto out;

    }

    TRACE("reading %s, offset %u...\n", slot->s_buf, (unsigned)f->f_pos);

    res = 0;

    switch((unsigned int)f->f_pos){

    case 0:

	if(filldir(dirent, ".", 1, 0, f->f_dentry->d_inode->i_ino, DT_DIR) < 0)

	    goto out;

	f->f_pos++;

    case 1:

	if(filldir(dirent, "..", 2, 1, f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0)

	    goto out;

	f->f_pos++;

    default:

	offset = f->f_pos;

	siov[0].iov_base = &offset;

	siov[0].iov_len = sizeof(unsigned short);

	siov[1].iov_base = slot->s_buf;

	siov[1].iov_len = strlen(slot->s_buf) + 1;

	riov.iov_base = slot->s_buf;

	riov.iov_len = LU_MAXDATA;

	if((res = lu_execute(GET_INFO(f->f_dentry->d_inode->i_sb), slot, PTYPE_READDIR, siov, 2, &riov, 1)) < 0){

	    WARN("could not read directory content!\n");

	    if(res == -ERESTARTSYS)

		res = -EINTR;

	    goto out;

	}

	if(PIS_ERROR(res)){

	    WARN("server failure!\n");

	    res = PERROR(res);

	    goto out;

	}

	for(qname.name = slot->s_buf, c = strchr(slot->s_buf, '\n'); c != NULL; qname.name = c+1, c = strchr(c+1, '\n')){

	    *c = 0;

	    TRACE("direntry: %s.\n", qname.name);

	    qname.len = strlen(qname.name);

	    if((ino = find_inode_number(f->f_dentry, &qname)) == 0)

		ino = iunique(f->f_dentry->d_sb, 2);

	    if(filldir(dirent, qname.name, qname.len, f->f_pos, ino, DT_UNKNOWN) < 0)

		break;

	    f->f_pos++;	    

	}

    }

    TRACE("out\n");

 out:

    lu_putslot(slot);

    return res;

}

static struct dentry* lu_lookup(struct inode *dir, struct dentry *dentry)

{

    int res;

    struct lufs_fattr fattr;

    struct iovec siov, riov;

    struct inode *inode;

    struct server_slot *slot;

    TRACE("in\n");

    if((slot = lu_getslot(GET_INFO(dir->i_sb))) == NULL)

	return ERR_PTR(-ERESTARTSYS);

    if((res = lu_getname(dentry, slot->s_buf, LU_MAXDATA)) < 0){

	WARN("lu_getname failed!\n");

	goto out;

    }

    TRACE("looking up %s\n", slot->s_buf);

    siov.iov_base = slot->s_buf;

    siov.iov_len = strlen(slot->s_buf) + 1;

    riov.iov_base = &fattr;

    riov.iov_len = sizeof(struct lufs_fattr);

    if((res = lu_execute(GET_INFO(dir->i_sb), slot, PTYPE_STAT, &siov, 1, &riov, 1)) < 0)

	goto out;

    if(PIS_ERROR(res)){

	TRACE("File not found...\n");

	dentry->d_op = &lufs_dentry_operations;

	dentry->d_time = jiffies;

	d_add(dentry, NULL);

	lu_putslot(slot);

	return NULL;

    }

    lu_fixattrs(GET_INFO(dir->i_sb), &fattr);

    if(dentry == dentry->d_parent)

	fattr.f_ino = 2;

    else 

	fattr.f_ino = iunique(dentry->d_sb, 2);

    if((inode = lu_iget(dir->i_sb, &fattr))){

	dentry->d_op = &lufs_dentry_operations;

	dentry->d_time = jiffies;

	d_add(dentry, inode);

    }

    res = 0;

 out:

    lu_putslot(slot);

    TRACE("out\n");

    return ERR_PTR(res);

}

static int lu_instantiate(struct dentry *dentry, char *name, struct server_slot *slot)

{

    int res;

    struct lufs_fattr fattr;

    struct iovec siov, riov;

    struct inode *inode;

    TRACE("in\n");

    TRACE("instantiating %s\n", name);

    siov.iov_base = name;

    siov.iov_len = strlen(name) + 1;

    riov.iov_base = &fattr;

    riov.iov_len = sizeof(struct lufs_fattr);

    if((res = lu_execute(GET_INFO(dentry->d_sb), slot, PTYPE_STAT, &siov, 1, &riov, 1)) < 0)

	goto out;

    if(PIS_ERROR(res)){

	TRACE("File not found...\n");

	res = PERROR(res);

	goto out;

    }

    lu_fixattrs(GET_INFO(dentry->d_sb), &fattr);

    fattr.f_ino = iunique(dentry->d_sb, 2);

    inode = lu_iget(dentry->d_sb, &fattr);

    if(!inode){

	res = -EACCES;

	goto out;

    }

    d_instantiate(dentry, inode);

    res = 0;

  out:

    TRACE("out\n");

    return res;

}

static int lu_mkdir(struct inode *dir, struct dentry *dentry, int mode)

{

    int res;

    struct server_slot *slot;

    struct iovec iov[2];

    TRACE("in\n");

    if((slot = lu_getslot(GET_INFO(dentry->d_sb))) == NULL)

	return -ERESTARTSYS;

    if((res = lu_getname(dentry, slot->s_buf, LU_MAXDATA)) < 0){

	WARN("lu_getname failed!\n");

	goto out;

    }

    iov[0].iov_base = &mode;

    iov[0].iov_len = sizeof(mode);

    iov[1].iov_base = slot->s_buf;

    iov[1].iov_len = strlen(slot->s_buf) + 1;

    if((res = lu_execute(GET_INFO(dentry->d_sb), slot, PTYPE_MKDIR, iov, 2, NULL, 0)) < 0)

	goto out;

    if(PIS_ERROR(res)){

	TRACE("Could not create directory.\n");

	res = PERROR(res);

	goto out;

    }

    res = lu_instantiate(dentry, slot->s_buf, slot);

  out:

    lu_putslot(slot);

    TRACE("out\n");

    return res;

}

static int lu_create(struct inode *dir, struct dentry *dentry, int mode)

{

    int res;

    struct server_slot *slot;

    struct iovec iov[2];

    TRACE("in\n");

    if((slot = lu_getslot(GET_INFO(dentry->d_sb))) == NULL)

	return -ERESTARTSYS;

    if((res = lu_getname(dentry, slot->s_buf, LU_MAXDATA)) < 0){

	WARN("lu_getname failed!\n");

	goto out;

    }

    iov[0].iov_base = &mode;

    iov[0].iov_len = sizeof(mode);

    iov[1].iov_base = slot->s_buf;

    iov[1].iov_len = strlen(slot->s_buf) + 1;

    if((res = lu_execute(GET_INFO(dentry->d_sb), slot, PTYPE_CREATE, iov, 2, NULL, 0)) < 0)

	goto out;

    if(PIS_ERROR(res)){

	TRACE("Could not create file.\n");

	res = PERROR(res);

	goto out;

    }

    res = lu_instantiate(dentry, slot->s_buf, slot);

  out:

    lu_putslot(slot);

    TRACE("out\n");

    return res;

}

static int lu_rmdir(struct inode *dir, struct dentry *dentry)

{

    int res;

    struct server_slot *slot;

    struct iovec iov;

    if(!d_unhashed(dentry))

	return -EBUSY;    

    TRACE("in\n");

    if((slot = lu_getslot(GET_INFO(dentry->d_sb))) == NULL)

	return -ERESTARTSYS;

    if((res = lu_getname(dentry, slot->s_buf, LU_MAXDATA)) < 0){

	WARN("lu_getname failed!");

	goto out;

    }

    iov.iov_base = slot->s_buf;

    iov.iov_len = strlen(slot->s_buf) + 1;

    if((res = lu_execute(GET_INFO(dentry->d_sb), slot, PTYPE_RMDIR, &iov, 1, NULL, 0)) < 0)

	goto out;

    if(PIS_ERROR(res)){

	TRACE("rmdir failed!\n");

	res = PERROR(res);

	goto out;

    }

    res = 0;

  out:

    lu_putslot(slot);

    TRACE("out\n");

    return res;

}

static int lu_rename(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry)

{

    struct server_slot *slot;

    int res;

    struct iovec iov[2];

    TRACE("in\n");

    if((slot = lu_getslot(GET_INFO(old_dentry->d_sb))) == NULL)

	return -ERESTARTSYS;

    if((res = lu_getname(old_dentry, slot->s_buf, LU_MAXPATHLEN)) < 0 ||

       (res = lu_getname(new_dentry, &(slot->s_buf[LU_MAXPATHLEN]), LU_MAXPATHLEN)) < 0){

	WARN("lu_getname failed!\n");

	goto out;

    }

    iov[0].iov_base = slot->s_buf;

    iov[0].iov_len = strlen(slot->s_buf) + 1;

    iov[1].iov_base = &(slot->s_buf[LU_MAXPATHLEN]);

    iov[1].iov_len = strlen(&(slot->s_buf[LU_MAXPATHLEN])) + 1;

    if((res = lu_execute(GET_INFO(old_dentry->d_sb), slot, PTYPE_RENAME, iov, 2, NULL, 0)) < 0)

	goto out;

    if(PIS_ERROR(res)){

	TRACE("rename failed!\n");

	res = PERROR(res);

	goto out;

    }

    res = 0;

  out:

    lu_putslot(slot);

    TRACE("out\n");

    return res;

}

static int lu_unlink(struct inode *dir, struct dentry *dentry)

{

    int res;

    struct server_slot *slot;

    struct iovec iov;

    TRACE("in\n");

    if((slot = lu_getslot(GET_INFO(dentry->d_sb))) == NULL)

	return -ERESTARTSYS;

    if((res = lu_getname(dentry, slot->s_buf, LU_MAXPATHLEN)) < 0){

	WARN("lu_getname failed!");

	goto out;

    }

    iov.iov_base = slot->s_buf;

    iov.iov_len = strlen(slot->s_buf) + 1;

    if((res = lu_execute(GET_INFO(dentry->d_sb), slot, PTYPE_UNLINK, &iov, 1, NULL, 0)) < 0)

	goto out;

    if(PIS_ERROR(res)){

	TRACE("unlink failed!\n");

	res = PERROR(res);

	goto out;

    }

    res = 0;

  out:

    lu_putslot(slot);

    TRACE("out\n");

    return res;

}

static int lu_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)

{

    int res;

    struct server_slot *slot;

    struct iovec iov[2];

    TRACE("in\n");

    if(S_ISDIR(old_dentry->d_inode->i_mode))

	return -EPERM;

    if(!(slot = lu_getslot(GET_INFO(old_dentry->d_sb))))

	return -ERESTARTSYS;

    if((res = lu_getname(old_dentry, slot->s_buf, LU_MAXPATHLEN)) < 0){

	WARN("lu_getname failed!\n");

	goto out;

    }

    if((res = lu_getname(dentry, &slot->s_buf[LU_MAXPATHLEN], LU_MAXPATHLEN)) < 0){

	WARN("lu_getname failed!\n");

	goto out;

    }

    iov[0].iov_base = slot->s_buf;

    iov[0].iov_len = strlen(slot->s_buf) + 1;

    iov[1].iov_base = &slot->s_buf[LU_MAXPATHLEN];

    iov[1].iov_len = strlen(&slot->s_buf[LU_MAXPATHLEN]) + 1;

    d_drop(dentry);

    if((res = lu_execute(GET_INFO(old_dentry->d_sb), slot, PTYPE_LINK, iov, 2, NULL, 0)) < 0)

	goto out;

    if(PIS_ERROR(res)){

	TRACE("link failed!\n");

	res = PERROR(res);

	goto out;

    }

    res = 0;

  out:

    lu_putslot(slot);

    TRACE("out\n");

    return res;

}

static int lu_symlink(struct inode *dir, struct dentry *dentry, const char *symname)

{

    int res;

    struct server_slot *slot;

    struct iovec iov[2];

    TRACE("in\n");

    TRACE("symlink: %s\n", symname);

    if(strlen(symname) > LU_MAXPATHLEN - 1)

	return -ENAMETOOLONG;

    if(!(slot = lu_getslot(GET_INFO(dentry->d_sb))))

	return -ERESTARTSYS;

    if((res = lu_getname(dentry, slot->s_buf, LU_MAXPATHLEN)) < 0){

	WARN("lu_getname failed!\n");

	goto out;

    }

    TRACE("fname: %s\n", slot->s_buf);

    strcpy(&slot->s_buf[LU_MAXPATHLEN], symname);

    iov[0].iov_base = slot->s_buf;

    iov[0].iov_len = strlen(slot->s_buf) + 1;

    iov[1].iov_base = &slot->s_buf[LU_MAXPATHLEN];

    iov[1].iov_len = strlen(&slot->s_buf[LU_MAXPATHLEN]) + 1;

    d_drop(dentry);

    if((res = lu_execute(GET_INFO(dentry->d_sb), slot, PTYPE_SYMLINK, iov, 2, NULL, 0)) < 0)

	goto out;

    if(PIS_ERROR(res)){

	TRACE("symlink failed!\n");

	res = PERROR(res);

	goto out;

    }

    res = 0;

  out:

    lu_putslot(slot);

    TRACE("out\n");

    return res;

}

/*

 * file.c

 * Copyright (C) 2002 Florin Malita <mali@go.ro>

 *

 * This file is part of LUFS, a free userspace filesystem implementation.

 * See http://lufs.sourceforge.net/ for updates.

 *

 * LUFS is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * LUFS is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

#include <linux/version.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/pagemap.h>

#include <linux/socket.h>

#include <asm/uaccess.h>

#include <asm/system.h>

#include <linux/smp_lock.h>

#include "lufs.h"

#include "proc.h"

extern int lufs_notify_change(struct dentry*, struct iattr*);

extern int lu_revalidate_inode(struct dentry*);

static int lu_file_open(struct inode *inode, struct file *file)

{

    int res, gres;

    struct server_slot *slot;

    struct iovec iov[2];

    unsigned flags;

    TRACE("in\n");

    if((gres = generic_file_open(inode, file)) < 0)

	return gres;

    TRACE("f_mode: %u, i_mode: %u\n", file->f_mode, inode->i_mode);

    TRACE("f_flags: %u, i_flags: %u\n", file->f_flags, inode->i_flags);

    if((slot = lu_getslot(GET_INFO(file->f_dentry->d_sb))) == NULL)

	return gres;

    if((res = lu_getname(file->f_dentry, slot->s_buf, LU_MAXDATA)) < 0){

	WARN("lu_getname failed!\n");

	goto out;

    }

    flags = file->f_flags & O_ACCMODE;

    iov[0].iov_base = &flags;

    iov[0].iov_len = sizeof(flags);

    iov[1].iov_base = slot->s_buf;

    iov[1].iov_len = strlen(slot->s_buf) + 1;

    lu_execute(GET_INFO(file->f_dentry->d_sb), slot, PTYPE_OPEN, iov, 2, NULL, 0);

out:

    lu_putslot(slot);

    TRACE("out\n");

    return gres;

}

static int lu_file_release(struct inode *inode, struct file *file)

{

    int res;

    struct server_slot *slot;

    struct iovec iov;

    TRACE("in\n");

    if((slot = lu_getslot(GET_INFO(file->f_dentry->d_sb))) == NULL)

	return -ERESTARTSYS;

    if((res = lu_getname(file->f_dentry, slot->s_buf, LU_MAXPATHLEN)) < 0){

	WARN("lu_getname failed!\n");

	goto out;

    }

    iov.iov_base = slot->s_buf;

    iov.iov_len = strlen(slot->s_buf) + 1;

    if((res = lu_execute(GET_INFO(file->f_dentry->d_sb), slot, PTYPE_RELEASE, &iov, 1, NULL, 0)) < 0)

	goto out;

    if(PIS_ERROR(res)){

	TRACE("release failed\n");

	res = PERROR(res);

	goto out;

    }

    res = 0;

out:

    lu_putslot(slot);

    TRACE("out\n");

    return res;

}

static int lu_file_readpage(struct file *f, struct page *p)

{

    int res;

    struct iovec siov[3], riov;

    long long offset;

    unsigned long count;

    struct server_slot *slot;

    TRACE("in\n");

    if((slot = lu_getslot(GET_INFO(f->f_dentry->d_sb))) == NULL)

	return -ERESTARTSYS;

    get_page(p);

    if((res = lu_getname(f->f_dentry, slot->s_buf, LU_MAXDATA)) < 0){

	WARN("lu_getname failed!\n");

	goto out;

    }

    offset = p->index << PAGE_CACHE_SHIFT;

    count = PAGE_SIZE;

    siov[0].iov_base = &offset;

    siov[0].iov_len = sizeof(offset);

    siov[1].iov_base = &count;

    siov[1].iov_len = sizeof(count);

    siov[2].iov_base = slot->s_buf;

    siov[2].iov_len = strlen(slot->s_buf) + 1;

    riov.iov_base = page_address(p);

    riov.iov_len = count;

    if((res = lu_execute(GET_INFO(f->f_dentry->d_sb), slot, PTYPE_READ, siov, 3, &riov, 1)) < 0)

	goto out;

    if(PIS_ERROR(res)){

	TRACE("read failed\n");

	res = PERROR(res);

	goto out;

    }

    flush_dcache_page(p);

    SetPageUptodate(p);

    res = 0;

  out:

    lu_putslot(slot);

    unlock_page(p);

    put_page(p);

    TRACE("out\n");

    return res;

}

static int lu_file_writepage(struct page *p, struct writeback_control *wbc)

{

    TRACE("in\n");

    TRACE("out\n");

    return -1;

}

static int lu_file_preparewrite(struct file *f, struct page *p, unsigned offset, unsigned to)

{

    TRACE("in\n");

    TRACE("out\n");

    return 0;

}

static int lu_file_commitwrite(struct file *f, struct page *p, unsigned offset, unsigned to)

{

    int res;

    struct server_slot *slot;

    struct iovec iov[4];

    char *buf;

    long long off;

    unsigned long cnt;

    TRACE("in\n");

    if((slot = lu_getslot(GET_INFO(f->f_dentry->d_sb))) == NULL)

	return -ERESTARTSYS;

    if((res = lu_getname(f->f_dentry, slot->s_buf, LU_MAXDATA)) < 0){

	WARN("lu_getname failed!\n");

	goto out2;

    }

    lock_kernel();

    buf = kmap(p) + offset;

    cnt = to - offset;

    off = offset + (((long long)p->index) << PAGE_CACHE_SHIFT);

    iov[0].iov_base = &off;

    iov[0].iov_len = sizeof(off);

    iov[1].iov_base = &cnt;

    iov[1].iov_len = sizeof(cnt);

    iov[2].iov_base = slot->s_buf;

    iov[2].iov_len = strlen(slot->s_buf) + 1;

    iov[3].iov_base = buf;

    iov[3].iov_len = cnt;

    TRACE("write %s, offset %Ld, count %d\n", slot->s_buf, off, (int)cnt);

    if((res = lu_execute(GET_INFO(f->f_dentry->d_sb), slot, PTYPE_WRITE, iov, 4, NULL, 0)) < 0)

	goto out1;

    if(PIS_ERROR(res)){

	TRACE("write failed\n");

	res = PERROR(res);

	goto out1;

    }

    f->f_dentry->d_inode->i_mtime = f->f_dentry->d_inode->i_atime = CURRENT_TIME;

    if(off + cnt > f->f_dentry->d_inode->i_size)

	f->f_dentry->d_inode->i_size = off + cnt;

    res = cnt;

  out1:

    kunmap(p);

    unlock_kernel();

  out2:

    lu_putslot(slot);

    TRACE("out\n");

    return res;

}

static int lu_file_read(struct file *filp, char *buf, size_t count, loff_t *ppos)

{

    struct dentry *dentry = filp->f_dentry;

    int res;

    TRACE("in\n");

    if(!(res = lu_revalidate_inode(dentry)))

	res = generic_file_read(filp, buf, count, ppos);

    TRACE("out\n");

    return res;

}

static int lu_file_mmap(struct file *filp, struct vm_area_struct *vma)

{

    struct dentry *dentry = filp->f_dentry;

    int res;

    TRACE("in\n");

    if(!(res = lu_revalidate_inode(dentry)))

	res = generic_file_mmap(filp, vma);

    TRACE("out\n");

    return res;

}

static ssize_t lu_file_write(struct file *filp, const char *buf, size_t count, loff_t *ppos)

{

    struct dentry *dentry = filp->f_dentry;

    ssize_t res;

    TRACE("in\n");

    if(!(res = lu_revalidate_inode(dentry)) && (count > 0))

	res = generic_file_write(filp, buf, count, ppos);

    TRACE("out\n");

    return res;

}

static int lu_file_fsync(struct file *filp, struct dentry *dentryp, int datasync)

{    

    return 0;

}

struct file_operations lu_file_operations = {

    .llseek	= generic_file_llseek,

    .read	= lu_file_read,

    .write	= lu_file_write,

    .mmap	= lu_file_mmap,

    .open	= lu_file_open,

    .release	= lu_file_release,

    :fsync	= lu_file_fsync,

};

struct inode_operations lu_file_inode_operations = {

    .setattr	= lufs_notify_change,

};

struct address_space_operations lu_file_aops = {

    .readpage	       	= lu_file_readpage,

    .writepage		= lu_file_writepage,

    .prepare_write	= lu_file_preparewrite,

    .commit_write	= lu_file_commitwrite,

};

/*

 * inode.c

 * Copyright (C) 2002-2003 Florin Malita <mali@go.ro>

 *

 * This file is part of LUFS, a free userspace filesystem implementation.

 * See http://lufs.sourceforge.net/ for updates.

 *

 * LUFS is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * LUFS is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

#include <linux/version.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/fs.h>

#include <linux/slab.h>

#include <linux/list.h>

#include <linux/smp_lock.h>

#include <linux/signal.h>

#include <linux/sched.h>

#include <linux/socket.h>

#include <linux/string.h>

#include <linux/vfs.h>

#include <asm/system.h>

#include <asm/uaccess.h>

#include "lufs.h"

#include "proc.h"

MODULE_AUTHOR("Florin Malita <mali@go.ro>");

MODULE_DESCRIPTION("Linux Userland Filesystem");

#ifdef MODULE_LICENSE

MODULE_LICENSE("GPL");

#endif

extern struct file_operations lu_dir_operations, lu_file_operations;

extern struct inode_operations lu_dir_inode_operations, lu_file_inode_operations, lu_symlink_inode_operations;

extern struct address_space_operations lu_file_aops;

extern struct dentry_operations lufs_dentry_operations;

static void lu_delete_inode(struct inode*);

static void lu_put_super(struct super_block*);

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

static struct super_operations lu_sops = {

    .drop_inode		= generic_delete_inode,

    .delete_inode	= lu_delete_inode,

    .put_super		= lu_put_super,

    .statfs		= lu_statfs,

};

/*

 * Ignore unknown options, they're probably for the userspace daemon.

 */

static void parse_options(struct lufs_sb_info *server, char *opts)

{

    char *p, *q;

    int len;

    if(!opts)

	return;

    len = strlen(opts);

    while((p = strsep(&opts, ","))){

	if(strncmp(p, "server_socket=", 14) == 0){

	    if(strlen(p+14) > UNIX_PATH_MAX)

		goto ugly_opts;

	    strcpy(server->server_socket, p+14);

	    TRACE("server_socket: %s\n", server->server_socket);

	}else 

	if(strncmp(p, "uid=", 4) == 0){

	    if(current->uid)

		ERROR("only root can use uid option!\n");

	    else{

		if(strlen(p+4) > 5)

		    goto ugly_opts;

		q = p + 4;

		server->config.uid = simple_strtoul(q, &q, 0);

		TRACE("uid: %d\n", server->config.uid); 

	    }

	}else

	if(strncmp(p, "gid=", 4) == 0){

	    if(current->uid)

		ERROR("only root can use gid option!\n");

	    else{

		if(strlen(p+4) > 5)

		    goto ugly_opts;

		q = p + 4;

		server->config.gid = simple_strtoul(q, &q, 0);

		TRACE("gid: %d\n", server->config.gid); 

	    }

	}else

	if(strncmp(p, "fmask=", 6) == 0){

	    if(strlen(p + 6) > 3)

		goto ugly_opts;

	    q = p + 6;

	    server->config.fmode = (((q[0] - '0') << 6) + ((q[1] - '0') << 3) + (q[2] - '0')) & (S_IRWXU | S_IRWXG | S_IRWXO);

	    TRACE("fmode: %d\n", server->config.fmode);

	}else

	if(strncmp(p, "dmask=", 6) == 0){

	    if(strlen(p + 6) > 3)

		goto ugly_opts;

	    q = p + 6;

	    server->config.dmode = (((q[0] - '0') << 6) + ((q[1] - '0') << 3) + (q[2] - '0')) & (S_IRWXU | S_IRWXG | S_IRWXO);

	    TRACE("dmode: %d\n", server->config.dmode);

	}else

	if(strncmp(p, "root=", 5) == 0){

	    if(strlen(p+5) >= UNIX_PATH_MAX - 1)

		goto ugly_opts;

	    strcpy(server->root, p+5);

	    server->rootlen = strlen(server->root);

	    if(server->root[server->rootlen - 1] == '/'){

		server->root[server->rootlen - 1] = 0;

		server->rootlen--;

	    }

	    TRACE("remote root: %s, len: %u\n", server->root, server->rootlen);

	}else

	if(strncmp(p, "channels=", 9) == 0){

	    if(strlen(p+9) > 5)

		goto ugly_opts;

	    q = p + 9;

	    server->config.channels = simple_strtoul(q, &q, 0);

	    TRACE("channels: %u\n", server->config.channels);

	}else

	if(strncmp(p, "own_fs", 6) == 0){

	    server->config.own_fs = 1;

	    TRACE("forcing ownership\n");

	}else

	if(strncmp(p, "server_pid=", 11) == 0){

	    if(strlen(p+11) > 7)

		goto ugly_opts;

	    q = p + 11;

	    server->server_pid = simple_strtoul(q, &q, 0);

	    TRACE("server_pid: %u\n", server->server_pid);

	}

    }

    return;

  ugly_opts:

    WARN("evil options!\n");

}

/*

 * Fill in inode attributes. 

 * Ivalidate the page_cache pages if the inode has been modified.

 */

static void set_inode_attr(struct inode *inode, struct lufs_fattr *fattr)

{

    time_t last_time = inode->i_mtime.tv_sec;

    loff_t last_sz = inode->i_size;

    TRACE("in\n");

    inode->i_mode = fattr->f_mode;

    inode->i_nlink = fattr->f_nlink;

    inode->i_uid = fattr->f_uid;

    inode->i_gid = fattr->f_gid;

    inode->i_ctime.tv_sec = fattr->f_ctime;

    inode->i_mtime.tv_sec = fattr->f_mtime;

    inode->i_atime.tv_sec = fattr->f_atime;

    inode->i_blksize = fattr->f_blksize;

    inode->i_blocks = fattr->f_blocks;

    inode->i_size = fattr->f_size;

    if(inode->i_mtime.tv_sec != last_time || inode->i_size != last_sz){

	TRACE("inode changed...\n");

	if(!S_ISDIR(inode->i_mode))

	    invalidate_inode_pages(inode->i_mapping);

    }

    TRACE("out\n");

}

static int lu_do_stat(struct dentry *dentry, struct lufs_fattr *fattr)

{

    struct server_slot *slot;

    struct iovec siov, riov;

    int res;

    TRACE("in\n");

    if((slot = lu_getslot(GET_INFO(dentry->d_sb))) == NULL)

	return -ERESTARTSYS;

    if((res = lu_getname(dentry, slot->s_buf, LU_MAXDATA)) < 0){

	WARN("lu_getname failed!\n");

	goto out;

    }

    TRACE("stating %s...\n", slot->s_buf);

    siov.iov_base = slot->s_buf;

    siov.iov_len = strlen(slot->s_buf) + 1;

    riov.iov_base = fattr;

    riov.iov_len = sizeof(struct lufs_fattr);

    if((res = lu_execute(GET_INFO(dentry->d_sb), slot, PTYPE_STAT, &siov, 1, &riov, 1)) < 0)

	goto out;

    if(PIS_ERROR(res)){

	WARN("stat failed!\n");

	res = PERROR(res);

	goto out;

    }

    lu_fixattrs(GET_INFO(dentry->d_sb), fattr);

    res = 0;

  out:

    TRACE("out\n");

    lu_putslot(slot);

    return res;

}

/*

 * Reload inode attributes.

 */

static int lu_refresh_inode(struct dentry *dentry)

{

    struct inode *inode = dentry->d_inode;

    struct lufs_fattr fattr;

    int res;

    TRACE("in\n");

    if((res = lu_do_stat(dentry, &fattr)) < 0)

	return res;

    dentry->d_time = jiffies;

    if(!inode)

	return 0;

    if((inode->i_mode & S_IFMT) == (fattr.f_mode & S_IFMT))

	set_inode_attr(inode, &fattr);

    else{

	WARN("inode changed mode, %x to %x\n", inode->i_mode, (unsigned int)fattr.f_mode);

	TRACE("oops!\n");

	fattr.f_mode = inode->i_mode;

	make_bad_inode(inode);

	inode->i_mode = fattr.f_mode;

	if(!S_ISDIR(inode->i_mode))

	    invalidate_inode_pages(inode->i_mapping);

	return -EIO;

    }

    TRACE("out\n");

    return 0;

}

int lu_revalidate_inode(struct dentry *dentry)

{

    int res = 0;

    TRACE("in\n");

    lock_kernel();

    if(time_before(jiffies, dentry->d_time + LU_MAXAGE))

	goto out;

    res = lu_refresh_inode(dentry);

  out:

    TRACE("out\n");

    unlock_kernel();

    return res;

}

int lufs_notify_change(struct dentry *dentry, struct iattr *iattr)

{

    struct server_slot *slot;

    struct iovec iov[2];

    struct lufs_fattr fattr;

    int res;

    TRACE("in\n");

    if((res = lu_do_stat(dentry, &fattr)) < 0)

	return res;

    if((slot = lu_getslot(GET_INFO(dentry->d_sb))) == NULL)

	return -ERESTARTSYS;

    if((res = lu_getname(dentry, slot->s_buf, LU_MAXDATA)) < 0){

	WARN("lu_getname failed!\n");

	goto out;

    }

    if(iattr->ia_valid & ATTR_MODE)

	fattr.f_mode = iattr->ia_mode;

    if(iattr->ia_valid & ATTR_UID)

	fattr.f_uid  = iattr->ia_uid;

    if(iattr->ia_valid & ATTR_GID)

	fattr.f_gid  = iattr->ia_gid;

    if(iattr->ia_valid & ATTR_SIZE)

	fattr.f_size = iattr->ia_size;

    if(iattr->ia_valid & ATTR_ATIME)

	fattr.f_atime= iattr->ia_atime.tv_sec;

    if(iattr->ia_valid & ATTR_MTIME)

	fattr.f_mtime= iattr->ia_mtime.tv_sec;

    if(iattr->ia_valid & ATTR_CTIME)

	fattr.f_ctime= iattr->ia_ctime.tv_sec;

    iov[0].iov_base = &fattr;

    iov[0].iov_len = sizeof(struct lufs_fattr);

    iov[1].iov_base = slot->s_buf;

    iov[1].iov_len = strlen(slot->s_buf) + 1;

    if((res = lu_execute(GET_INFO(dentry->d_sb), slot, PTYPE_SETATTR, iov, 2, NULL, 0)) < 0)

	goto out;

    if(PIS_ERROR(res)){

	WARN("setattr failed!\n");

	res = PERROR(res);

	goto out;

    }

    res = 0;

    lu_refresh_inode(dentry);

  out:

    TRACE("out\n");

    lu_putslot(slot);

    return res;

}

/*

 * We always create a new inode here.

 */

struct inode* lu_iget(struct super_block *sb, struct lufs_fattr *fattr)

{

    struct inode *res;

    TRACE("in\n");

    res = new_inode(sb);

    if(!res)

	return NULL;

    res->i_ino = fattr->f_ino;

    set_inode_attr(res, fattr);

    if(S_ISDIR(res->i_mode)){

	TRACE("it's a dir.\n");

	res->i_op = &lu_dir_inode_operations;

	res->i_fop = &lu_dir_operations;

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

	TRACE("it's a link.\n");

	res->i_op = &lu_symlink_inode_operations;

    }else{

	TRACE("it's a file.\n");

	res->i_op = &lu_file_inode_operations;

	res->i_fop = &lu_file_operations;

	res->i_data.a_ops = &lu_file_aops;

    }

    insert_inode_hash(res);

    return res;

}

static int lu_statfs(struct super_block *sb, struct statfs *attr)

{

    TRACE("in\n");

    attr->f_type = LU_MAGIC;

    attr->f_bsize = LU_BLOCKSIZE;

    attr->f_blocks = 0;

    attr->f_namelen = LU_MAXPATHLEN;

    attr->f_files = -1;

    attr->f_bavail = -1;

    TRACE("out\n");

    return 0;

}

static void lu_put_super(struct super_block *sb)

{

    struct siginfo info;

    TRACE("in\n");

    info.si_signo = SIGUSR1;

    info.si_errno = 0;

    info.si_code = SI_USER;

    info.si_pid = current->pid;

    info.si_uid = current->uid;

    /* notify the daemon that we're going bye-bye */

    kill_proc_info(SIGUSR1, &info, GET_INFO(sb)->server_pid);

    lu_empty_slots(GET_INFO(sb));

    kfree(GET_INFO(sb));

    TRACE("out\n");

}

static void lu_delete_inode(struct inode *in)

{

    TRACE("in\n");

    clear_inode(in);

    TRACE("out\n");

}

static int lu_fill_super(struct super_block *sb, void *opts, int silent)

{

    struct lufs_sb_info *info;

    struct server_slot *slot;

    struct lufs_fattr root_attr;

    struct inode *root_inode;

    int i;

    TRACE("in\n");

    if(!opts){

	ERROR("need some options here!\n");

	goto out;

    }

    if((info = (struct lufs_sb_info*)kmalloc(sizeof(struct lufs_sb_info), GFP_KERNEL)) == NULL){

	ERROR("kmalloc error!\n");

	goto out;

    }

    memset(info, 0, sizeof(struct lufs_sb_info));

    info->lock = RW_LOCK_UNLOCKED;

    INIT_LIST_HEAD(&info->slots);

    info->config.uid = current->uid;

    info->config.gid = current->gid;    

    info->config.channels = LU_NRSLOTS;

    parse_options(info, opts);

    if(!info->server_socket[0]){

	ERROR("no server_socket specified!\n");

	goto out_info;

    }

    for(i = 0; i < info->config.channels; i++){

	if((slot = kmalloc(sizeof(struct server_slot), GFP_KERNEL)) == NULL){

	    ERROR("kmalloc error!\n");

	    goto out_slots;

	}

	memset(slot, 0, sizeof(struct server_slot));

	init_MUTEX(&slot->s_lock);

	if((slot->s_buf = kmalloc(LU_MAXDATA, GFP_KERNEL)) == NULL){

	    ERROR("kmalloc error!\n");

	    goto out_slots;

	}

	list_add(&slot->s_list, &info->slots);

    }

    sb->s_fs_info = info;

    sb->s_blocksize = LU_BLOCKSIZE;

    sb->s_blocksize_bits = LU_BLOCKSIZEBITS;

    sb->s_magic = LU_MAGIC;

    sb->s_op = &lu_sops;

    sb->s_flags = 0;

    sb->s_maxbytes = ((((long long)1) << 32) << LU_BLOCKSIZEBITS) - 1;

    TRACE("sb->s_maxbytes=%Ld\n",sb->s_maxbytes);

    lu_lookup_root(info, &root_attr);

    root_inode = lu_iget(sb, &root_attr);

    if(!root_inode)

	goto out_slots;

    sb->s_root = d_alloc_root(root_inode);

    if(!sb->s_root)

	goto out_slots;

    sb->s_root->d_op = &lufs_dentry_operations;

    sb->s_root->d_time = jiffies;

    TRACE("mount succeded: %s\n", info->server_socket);

    return 0;

 out_slots:

    lu_empty_slots(info);

 out_info:

    kfree(info);

 out:

    ERROR("mount failed!\n");

    return -EINVAL;

}

static struct super_block *lu_get_sb(struct file_system_type *fs_type, int flags, char *dev_name, void *data)

{

    return get_sb_nodev(fs_type, flags, data, lu_fill_super);

}

static struct file_system_type lu_fs_type = {

    .owner	= THIS_MODULE,

    .name	= "lufs",

    .get_sb	= lu_get_sb,

    .kill_sb	= kill_anon_super,

};

static int __init lu_init(void)

{

    VERBOSE("UserLand File System\n");

    VERBOSE("Copyright (c) 2002, Florin Malita\n");

    return register_filesystem(&lu_fs_type);

}

static void __exit lu_release(void)

{

    VERBOSE("Unregistering lufs...\n");

    unregister_filesystem(&lu_fs_type);

}

module_init(lu_init);

module_exit(lu_release);