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0b0c10b48d
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!
143 lines
6.0 KiB
C
143 lines
6.0 KiB
C
/*-
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* Copyright (c) 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ffs_extern.h 8.6 (Berkeley) 3/30/95
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* $FreeBSD$
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*/
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#ifndef _UFS_FFS_EXTERN_H
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#define _UFS_FFS_EXTERN_H
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/*
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* Sysctl values for the fast filesystem.
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*/
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#define FFS_REALLOCBLKS 3 /* block reallocation enabled */
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#define FFS_ASYNCFREE 4 /* asynchronous block freeing enabled */
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#define FFS_MAXID 5 /* number of valid ffs ids */
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#define FFS_NAMES { \
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{ 0, 0 }, \
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{ 0, 0 }, \
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{ 0, 0 }, \
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{ "doreallocblks", CTLTYPE_INT }, \
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{ "doasyncfree", CTLTYPE_INT }, \
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}
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struct buf;
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struct fid;
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struct fs;
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struct inode;
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struct malloc_type;
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struct mount;
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struct proc;
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struct sockaddr;
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struct statfs;
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struct ucred;
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struct vnode;
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struct vop_balloc_args;
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struct vop_bmap_args;
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struct vop_fsync_args;
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struct vop_reallocblks_args;
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struct vop_copyonwrite_args;
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int ffs_alloc __P((struct inode *,
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ufs_daddr_t, ufs_daddr_t, int, struct ucred *, ufs_daddr_t *));
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int ffs_balloc __P((struct vop_balloc_args *));
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int ffs_blkatoff __P((struct vnode *, off_t, char **, struct buf **));
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void ffs_blkfree __P((struct inode *, ufs_daddr_t, long));
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ufs_daddr_t ffs_blkpref __P((struct inode *, ufs_daddr_t, int, ufs_daddr_t *));
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int ffs_bmap __P((struct vop_bmap_args *));
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void ffs_clrblock __P((struct fs *, u_char *, ufs_daddr_t));
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int ffs_copyonwrite __P((struct vop_copyonwrite_args *ap));
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int ffs_fhtovp __P((struct mount *, struct fid *, struct vnode **));
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int ffs_flushfiles __P((struct mount *, int, struct proc *));
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void ffs_fragacct __P((struct fs *, int, int32_t [], int));
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int ffs_freefile __P(( struct vnode *, ino_t, int ));
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int ffs_isblock __P((struct fs *, u_char *, ufs_daddr_t));
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int ffs_isfreeblock __P((struct fs *, unsigned char *, ufs_daddr_t));
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int ffs_mountfs __P((struct vnode *, struct mount *, struct proc *,
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struct malloc_type *));
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int ffs_mountroot __P((void));
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int ffs_mount __P((struct mount *, char *, caddr_t, struct nameidata *,
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struct proc *));
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int ffs_reallocblks __P((struct vop_reallocblks_args *));
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int ffs_realloccg __P((struct inode *,
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ufs_daddr_t, ufs_daddr_t, int, int, struct ucred *, struct buf **));
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void ffs_setblock __P((struct fs *, u_char *, ufs_daddr_t));
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int ffs_snapblkfree __P((struct inode *freeip, ufs_daddr_t bno, long size));
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int ffs_snapshot __P((struct mount *mp, char *snapfile));
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void ffs_snapshot_mount __P((struct mount *mp));
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void ffs_snapshot_unmount __P((struct mount *mp));
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int ffs_statfs __P((struct mount *, struct statfs *, struct proc *));
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int ffs_sync __P((struct mount *, int, struct ucred *, struct proc *));
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int ffs_truncate __P((struct vnode *, off_t, int, struct ucred *, struct proc *));
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int ffs_unmount __P((struct mount *, int, struct proc *));
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int ffs_update __P((struct vnode *, int));
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int ffs_valloc __P((struct vnode *, int, struct ucred *, struct vnode **));
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int ffs_vfree __P((struct vnode *, ino_t, int));
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int ffs_vget __P((struct mount *, ino_t, struct vnode **));
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int ffs_vptofh __P((struct vnode *, struct fid *));
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extern vop_t **ffs_vnodeop_p;
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extern vop_t **ffs_specop_p;
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extern vop_t **ffs_fifoop_p;
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/*
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* Soft update function prototypes.
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*/
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void softdep_initialize __P((void));
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int softdep_mount __P((struct vnode *, struct mount *, struct fs *,
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struct ucred *));
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int softdep_flushworklist __P((struct mount *, int *, struct proc *));
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int softdep_flushfiles __P((struct mount *, int, struct proc *));
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void softdep_update_inodeblock __P((struct inode *, struct buf *, int));
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void softdep_load_inodeblock __P((struct inode *));
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void softdep_freefile __P((struct vnode *, ino_t, int));
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void softdep_setup_freeblocks __P((struct inode *, off_t));
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void softdep_setup_inomapdep __P((struct buf *, struct inode *, ino_t));
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void softdep_setup_blkmapdep __P((struct buf *, struct fs *, ufs_daddr_t));
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void softdep_setup_allocdirect __P((struct inode *, ufs_lbn_t, ufs_daddr_t,
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ufs_daddr_t, long, long, struct buf *));
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void softdep_setup_allocindir_meta __P((struct buf *, struct inode *,
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struct buf *, int, ufs_daddr_t));
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void softdep_setup_allocindir_page __P((struct inode *, ufs_lbn_t,
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struct buf *, int, ufs_daddr_t, ufs_daddr_t, struct buf *));
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void softdep_fsync_mountdev __P((struct vnode *));
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int softdep_sync_metadata __P((struct vop_fsync_args *));
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/* XXX incorrectly moved to mount.h - should be indirect function */
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#if 0
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int softdep_fsync __P((struct vnode *vp));
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#endif
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#endif /* !_UFS_FFS_EXTERN_H */
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