minix/sys/ufs/chfs/chfs_subr.c

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/* $NetBSD: chfs_subr.c,v 1.2 2011/11/24 21:09:37 agc Exp $ */
/*-
* Copyright (c) 2010 Department of Software Engineering,
* University of Szeged, Hungary
* Copyright (C) 2010 Tamas Toth <ttoth@inf.u-szeged.hu>
* Copyright (C) 2010 Adam Hoka <ahoka@NetBSD.org>
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by the Department of Software Engineering, University of Szeged, Hungary
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/*
* Efficient memory file system supporting functions.
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/dirent.h>
#include <sys/event.h>
#include <sys/kmem.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/systm.h>
#include <sys/swap.h>
#include <sys/vnode.h>
#include <sys/kauth.h>
#include <sys/proc.h>
#include <sys/atomic.h>
#include <uvm/uvm.h>
#include <miscfs/specfs/specdev.h>
#include "chfs.h"
//#include <fs/chfs/chfs_vnops.h>
//#include </root/xipffs/netbsd.chfs/chfs.h>
/* --------------------------------------------------------------------- */
/*
* Returns information about the number of available memory pages,
* including physical and virtual ones.
*
* If 'total' is true, the value returned is the total amount of memory
* pages configured for the system (either in use or free).
* If it is FALSE, the value returned is the amount of free memory pages.
*
* Remember to remove DUMMYFS_PAGES_RESERVED from the returned value to avoid
* excessive memory usage.
*
*/
size_t
chfs_mem_info(bool total)
{
size_t size;
size = 0;
size += uvmexp.swpgavail;
if (!total) {
size -= uvmexp.swpgonly;
}
size += uvmexp.free;
size += uvmexp.filepages;
if (size > uvmexp.wired) {
size -= uvmexp.wired;
} else {
size = 0;
}
return size;
}
/* --------------------------------------------------------------------- */
/*
* Looks for a directory entry in the directory represented by node.
* 'cnp' describes the name of the entry to look for. Note that the .
* and .. components are not allowed as they do not physically exist
* within directories.
*
* Returns a pointer to the entry when found, otherwise NULL.
*/
struct chfs_dirent *
chfs_dir_lookup(struct chfs_inode *ip, struct componentname *cnp)
{
bool found;
struct chfs_dirent *fd;
dbg("dir_lookup()\n");
KASSERT(IMPLIES(cnp->cn_namelen == 1, cnp->cn_nameptr[0] != '.'));
KASSERT(IMPLIES(cnp->cn_namelen == 2, !(cnp->cn_nameptr[0] == '.' &&
cnp->cn_nameptr[1] == '.')));
//CHFS_VALIDATE_DIR(node);
//node->chn_status |= CHFS_NODE_ACCESSED;
found = false;
// fd = ip->dents;
// while(fd) {
TAILQ_FOREACH(fd, &ip->dents, fds) {
KASSERT(cnp->cn_namelen < 0xffff);
if (fd->vno == 0)
continue;
/*dbg("dirent dump:\n");
dbg(" ->vno: %d\n", fd->vno);
dbg(" ->version: %ld\n", fd->version);
dbg(" ->nhash: 0x%x\n", fd->nhash);
dbg(" ->nsize: %d\n", fd->nsize);
dbg(" ->name: %s\n", fd->name);
dbg(" ->type: %d\n", fd->type);*/
if (fd->nsize == (uint16_t)cnp->cn_namelen &&
memcmp(fd->name, cnp->cn_nameptr, fd->nsize) == 0) {
found = true;
break;
}
// fd = fd->next;
}
return found ? fd : NULL;
}
/* --------------------------------------------------------------------- */
int
chfs_filldir(struct uio* uio, ino_t ino, const char *name,
int namelen, enum vtype type)
{
struct dirent dent;
int error;
memset(&dent, 0, sizeof(dent));
dent.d_fileno = ino;
switch (type) {
case VBLK:
dent.d_type = DT_BLK;
break;
case VCHR:
dent.d_type = DT_CHR;
break;
case VDIR:
dent.d_type = DT_DIR;
break;
case VFIFO:
dent.d_type = DT_FIFO;
break;
case VLNK:
dent.d_type = DT_LNK;
break;
case VREG:
dent.d_type = DT_REG;
break;
case VSOCK:
dent.d_type = DT_SOCK;
break;
default:
KASSERT(0);
}
dent.d_namlen = namelen;
(void)memcpy(dent.d_name, name, dent.d_namlen);
dent.d_reclen = _DIRENT_SIZE(&dent);
if (dent.d_reclen > uio->uio_resid) {
error = -1;
} else {
error = uiomove(&dent, dent.d_reclen, uio);
}
return error;
}
/* --------------------------------------------------------------------- */
/*
* Change size of the given vnode.
* Caller should execute chfs_update on vp after a successful execution.
* The vnode must be locked on entry and remain locked on exit.
*/
int
chfs_chsize(struct vnode *vp, u_quad_t size, kauth_cred_t cred)
{
struct chfs_mount *chmp;
struct chfs_inode *ip;
struct buf *bp;
int blknum, append;
int error = 0;
char *buf = NULL;
struct chfs_full_dnode *fd;
ip = VTOI(vp);
chmp = ip->chmp;
dbg("chfs_chsize\n");
switch (vp->v_type) {
case VDIR:
return EISDIR;
case VLNK:
case VREG:
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return EROFS;
break;
case VBLK:
case VCHR:
case VFIFO:
return 0;
default:
return EOPNOTSUPP; /* XXX why not ENODEV? */
}
vflushbuf(vp, 0);
mutex_enter(&chmp->chm_lock_mountfields);
chfs_flush_pending_wbuf(chmp);
/* handle truncate to zero as a special case */
if (size == 0) {
dbg("truncate to zero");
chfs_truncate_fragtree(ip->chmp,
&ip->fragtree, size);
chfs_set_vnode_size(vp, size);
mutex_exit(&chmp->chm_lock_mountfields);
return 0;
}
/* allocate zeros for the new data */
buf = kmem_zalloc(size, KM_SLEEP);
bp = getiobuf(vp, true);
if (ip->size != 0) {
/* read the whole data */
bp->b_blkno = 0;
bp->b_bufsize = bp->b_resid = bp->b_bcount = ip->size;
bp->b_data = kmem_alloc(ip->size, KM_SLEEP);
error = chfs_read_data(chmp, vp, bp);
if (error) {
mutex_exit(&chmp->chm_lock_mountfields);
putiobuf(bp);
return error;
}
/* create the new data */
dbg("create new data vap%llu ip%llu\n",
(unsigned long long)size, (unsigned long long)ip->size);
append = size - ip->size;
if (append > 0) {
memcpy(buf, bp->b_data, ip->size);
} else {
memcpy(buf, bp->b_data, size);
chfs_truncate_fragtree(ip->chmp,
&ip->fragtree, size);
}
kmem_free(bp->b_data, ip->size);
struct chfs_node_frag *lastfrag = frag_last(&ip->fragtree);
fd = lastfrag->node;
chfs_mark_node_obsolete(chmp, fd->nref);
blknum = lastfrag->ofs / PAGE_SIZE;
lastfrag->size = append > PAGE_SIZE ? PAGE_SIZE : size % PAGE_SIZE;
} else {
fd = chfs_alloc_full_dnode();
blknum = 0;
}
chfs_set_vnode_size(vp, size);
// write the new data
for (bp->b_blkno = blknum; bp->b_blkno * PAGE_SIZE < size; bp->b_blkno++) {
uint64_t writesize = MIN(size - bp->b_blkno * PAGE_SIZE, PAGE_SIZE);
bp->b_bufsize = bp->b_resid = bp->b_bcount = writesize;
bp->b_data = kmem_alloc(writesize, KM_SLEEP);
memcpy(bp->b_data, buf + (bp->b_blkno * PAGE_SIZE), writesize);
if (bp->b_blkno != blknum) {
fd = chfs_alloc_full_dnode();
}
error = chfs_write_flash_dnode(chmp, vp, bp, fd);
if (error) {
mutex_exit(&chmp->chm_lock_mountfields);
kmem_free(bp->b_data, writesize);
putiobuf(bp);
return error;
}
if (bp->b_blkno != blknum) {
chfs_add_full_dnode_to_inode(chmp, ip, fd);
}
kmem_free(bp->b_data, writesize);
}
mutex_exit(&chmp->chm_lock_mountfields);
kmem_free(buf, size);
putiobuf(bp);
return 0;
}
#if 0
int error;
struct chfs_node *node;
KASSERT(VOP_ISLOCKED(vp));
node = VP_TO_CHFS_NODE(vp);
// Decide whether this is a valid operation based on the file type.
error = 0;
switch (vp->v_type) {
case VDIR:
return EISDIR;
case VREG:
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return EROFS;
break;
case VBLK:
case VCHR:
case VFIFO:
// Allow modifications of special files even if in the file
// system is mounted read-only (we are not modifying the
// files themselves, but the objects they represent).
return 0;
default:
return ENODEV;
}
// Immutable or append-only files cannot be modified, either.
if (node->chn_flags & (IMMUTABLE | APPEND))
return EPERM;
error = chfs_truncate(vp, size);
// chfs_truncate will raise the NOTE_EXTEND and NOTE_ATTRIB kevents
// for us, as will update dn_status; no need to do that here.
KASSERT(VOP_ISLOCKED(vp));
return error;
#endif
/* --------------------------------------------------------------------- */
/*
* Change flags of the given vnode.
* Caller should execute chfs_update on vp after a successful execution.
* The vnode must be locked on entry and remain locked on exit.
*/
int
chfs_chflags(struct vnode *vp, int flags, kauth_cred_t cred)
{
struct chfs_mount *chmp;
struct chfs_inode *ip;
int error = 0;
ip = VTOI(vp);
chmp = ip->chmp;
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return EROFS;
if (kauth_cred_geteuid(cred) != ip->uid &&
(error = kauth_authorize_generic(cred,
KAUTH_GENERIC_ISSUSER, NULL)))
return error;
if (kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER,
NULL) == 0) {
if ((ip->flags & (SF_IMMUTABLE | SF_APPEND)) &&
kauth_authorize_system(curlwp->l_cred,
KAUTH_SYSTEM_CHSYSFLAGS, 0, NULL, NULL, NULL))
return EPERM;
if ((flags & SF_SNAPSHOT) !=
(ip->flags & SF_SNAPSHOT))
return EPERM;
ip->flags = flags;
} else {
if ((ip->flags & (SF_IMMUTABLE | SF_APPEND)) ||
(flags & UF_SETTABLE) != flags)
return EPERM;
if ((ip->flags & SF_SETTABLE) !=
(flags & SF_SETTABLE))
return EPERM;
ip->flags &= SF_SETTABLE;
ip->flags |= (flags & UF_SETTABLE);
}
ip->iflag |= IN_CHANGE;
error = chfs_update(vp, NULL, NULL, UPDATE_WAIT);
if (error)
return error;
if (flags & (IMMUTABLE | APPEND))
return 0;
return error;
}
/* --------------------------------------------------------------------- */
void
chfs_itimes(struct chfs_inode *ip, const struct timespec *acc,
const struct timespec *mod, const struct timespec *cre)
{
//dbg("itimes\n");
struct timespec now;
if (!(ip->iflag & (IN_ACCESS | IN_CHANGE | IN_UPDATE | IN_MODIFY))) {
return;
}
vfs_timestamp(&now);
if (ip->iflag & IN_ACCESS) {
if (acc == NULL)
acc = &now;
ip->atime = acc->tv_sec;
}
if (ip->iflag & (IN_UPDATE | IN_MODIFY)) {
if (mod == NULL)
mod = &now;
ip->mtime = mod->tv_sec;
//ip->i_modrev++;
}
if (ip->iflag & (IN_CHANGE | IN_MODIFY)) {
if (cre == NULL)
cre = &now;
ip->ctime = cre->tv_sec;
}
if (ip->iflag & (IN_ACCESS | IN_MODIFY))
ip->iflag |= IN_ACCESSED;
if (ip->iflag & (IN_UPDATE | IN_CHANGE))
ip->iflag |= IN_MODIFIED;
ip->iflag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE | IN_MODIFY);
}
/* --------------------------------------------------------------------- */
int
chfs_update(struct vnode *vp, const struct timespec *acc,
const struct timespec *mod, int flags)
{
struct chfs_inode *ip;
/* XXX ufs_reclaim calls this function unlocked! */
// KASSERT(VOP_ISLOCKED(vp));
#if 0
if (flags & UPDATE_CLOSE)
; /* XXX Need to do anything special? */
#endif
ip = VTOI(vp);
chfs_itimes(ip, acc, mod, NULL);
// KASSERT(VOP_ISLOCKED(vp));
return (0);
}
/* --------------------------------------------------------------------- */
/*
int
chfs_truncate(struct vnode *vp, off_t length)
{
bool extended;
int error;
struct chfs_node *node;
printf("CHFS: truncate()\n");
node = VP_TO_CHFS_NODE(vp);
extended = length > node->chn_size;
if (length < 0) {
error = EINVAL;
goto out;
}
if (node->chn_size == length) {
error = 0;
goto out;
}
error = chfs_reg_resize(vp, length);
if (error == 0)
node->chn_status |= CHFS_NODE_CHANGED | CHFS_NODE_MODIFIED;
out:
chfs_update(vp, NULL, NULL, 0);
return error;
}*/