freebsd-dev/sys/ufs/ifs/ifs_extern.h

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Initial commit of IFS - a inode-namespaced FFS. Here is a short description: How it works: -- Basically ifs is a copy of ffs, overriding some vfs/vnops. (Yes, hack.) I didn't see the need in duplicating all of sys/ufs/ffs to get this off the ground. File creation is done through a special file - 'newfile' . When newfile is called, the system allocates and returns an inode. Note that newfile is done in a cloning fashion: fd = open("newfile", O_CREAT|O_RDWR, 0644); fstat(fd, &st); printf("new file is %d\n", (int)st.st_ino); Once you have created a file, you can open() and unlink() it by its returned inode number retrieved from the stat call, ie: fd = open("5", O_RDWR); The creation permissions depend entirely if you have write access to the root directory of the filesystem. To get the list of currently allocated inodes, VOP_READDIR has been added which returns a directory listing of those currently allocated. -- What this entails: * patching conf/files and conf/options to include IFS as a new compile option (and since ifs depends upon FFS, include the FFS routines) * An entry in i386/conf/NOTES indicating IFS exists and where to go for an explanation * Unstaticize a couple of routines in src/sys/ufs/ffs/ which the IFS routines require (ffs_mount() and ffs_reload()) * a new bunch of routines in src/sys/ufs/ifs/ which implement the IFS routines. IFS replaces some of the vfsops, and a handful of vnops - most notably are VFS_VGET(), VOP_LOOKUP(), VOP_UNLINK() and VOP_READDIR(). Any other directory operation is marked as invalid. What this results in: * an IFS partition's create permissions are controlled by the perm/ownership of the root mount point, just like a normal directory * Each inode has perm and ownership too * IFS does *NOT* mean an FFS partition can be opened per inode. This is a completely seperate filesystem here * Softupdates doesn't work with IFS, and really I don't think it needs it. Besides, fsck's are FAST. (Try it :-) * Inodes 0 and 1 aren't allocatable because they are special (dump/swap IIRC). Inode 2 isn't allocatable since UFS/FFS locks all inodes in the system against this particular inode, and unravelling THAT code isn't trivial. Therefore, useful inodes start at 3. Enjoy, and feedback is definitely appreciated!
2000-10-14 03:02:30 +00:00
/*-
* Copyright (c) 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)ffs_extern.h 8.6 (Berkeley) 3/30/95
* $FreeBSD$
*/
#ifndef _UFS_IFS_EXTERN_H
#define _UFS_IFS_EXTERN_H
/*
* Sysctl values for the fast filesystem.
*/
#define IFS_REALLOCBLKS 3 /* block reallocation enabled */
#define IFS_ASYNCFREE 4 /* asynchronous block freeing enabled */
#define IFS_MAXID 5 /* number of valid ffs ids */
/* Return vals from ifs_isinodealloc */
#define IFS_INODE_ISALLOC 1
#define IFS_INODE_NOALLOC 0
#define IFS_INODE_EMPTYCG -1
#define IFS_NAMES { \
{ 0, 0 }, \
{ 0, 0 }, \
{ 0, 0 }, \
{ "doreallocblks", CTLTYPE_INT }, \
{ "doasyncfree", CTLTYPE_INT }, \
}
struct buf;
struct fid;
struct fs;
struct inode;
struct malloc_type;
struct mount;
struct sockaddr;
struct statfs;
struct ucred;
struct vnode;
struct vop_balloc_args;
struct vop_fsync_args;
struct vop_reallocblks_args;
extern vop_t **ifs_vnodeop_p;
extern vop_t **ifs_specop_p;
extern vop_t **ifs_fifoop_p;
int ifs_lookup(struct vop_lookup_args *);
int ifs_isinodealloc(struct inode *, ufs_daddr_t);
#endif /* !_UFS_IFS_EXTERN_H */