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Annotation of Net2/isofs/isofs_node.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986, 1989 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)isofs_inode.c
        !            34:  */
        !            35: 
        !            36: #include "param.h"
        !            37: #include "systm.h"
        !            38: #include "mount.h"
        !            39: #include "proc.h"
        !            40: #include "file.h"
        !            41: #include "buf.h"
        !            42: #include "vnode.h"
        !            43: #include "kernel.h"
        !            44: #include "malloc.h"
        !            45: 
        !            46: #include "iso.h"
        !            47: #include "isofs_node.h"
        !            48: 
        !            49: #define        INOHSZ  512
        !            50: #if    ((INOHSZ&(INOHSZ-1)) == 0)
        !            51: #define        INOHASH(dev,ino)        (((dev)+(ino))&(INOHSZ-1))
        !            52: #else
        !            53: #define        INOHASH(dev,ino)        (((unsigned)((dev)+(ino)))%INOHSZ)
        !            54: #endif
        !            55: 
        !            56: union iso_ihead {
        !            57:        union  iso_ihead *ih_head[2];
        !            58:        struct iso_node *ih_chain[2];
        !            59: } iso_ihead[INOHSZ];
        !            60: 
        !            61: int prtactive; /* 1 => print out reclaim of active vnodes */
        !            62: 
        !            63: /*
        !            64:  * Initialize hash links for inodes.
        !            65:  */
        !            66: isofs_init()
        !            67: {
        !            68:        register int i;
        !            69:        register union iso_ihead *ih = iso_ihead;
        !            70: 
        !            71: #ifndef lint
        !            72:        if (VN_MAXPRIVATE < sizeof(struct iso_node))
        !            73:                panic("ihinit: too small");
        !            74: #endif /* not lint */
        !            75:        for (i = INOHSZ; --i >= 0; ih++) {
        !            76:                ih->ih_head[0] = ih;
        !            77:                ih->ih_head[1] = ih;
        !            78:        }
        !            79: }
        !            80: 
        !            81: /*
        !            82:  * Look up a ISOFS dinode number to find its incore vnode.
        !            83:  * If it is not in core, read it in from the specified device.
        !            84:  * If it is in core, wait for the lock bit to clear, then
        !            85:  * return the inode locked. Detection and handling of mount
        !            86:  * points must be done by the calling routine.
        !            87:  */
        !            88: iso_iget(xp, ino, ipp, isodir)
        !            89:        struct iso_node *xp;
        !            90:        ino_t ino;
        !            91:        struct iso_node **ipp;
        !            92:        struct iso_directory_record *isodir;
        !            93: {
        !            94:        dev_t dev = xp->i_dev;
        !            95:        struct mount *mntp = ITOV(xp)->v_mount;
        !            96:        extern struct vnodeops isofs_vnodeops, spec_inodeops;
        !            97:        register struct iso_node *ip, *iq;
        !            98:        register struct vnode *vp;
        !            99:        struct vnode *nvp;
        !           100:        struct buf *bp;
        !           101:        struct dinode *dp;
        !           102:        union iso_ihead *ih;
        !           103:        int i, error;
        !           104:        struct iso_mnt *imp;
        !           105: 
        !           106:        ih = &iso_ihead[INOHASH(dev, ino)];
        !           107: loop:
        !           108:        for (ip = ih->ih_chain[0];
        !           109:             ip != (struct iso_node *)ih;
        !           110:             ip = ip->i_forw) {
        !           111:                if (ino != ip->i_number || dev != ip->i_dev)
        !           112:                        continue;
        !           113:                if ((ip->i_flag&ILOCKED) != 0) {
        !           114:                        ip->i_flag |= IWANT;
        !           115:                        sleep((caddr_t)ip, PINOD);
        !           116:                        goto loop;
        !           117:                }
        !           118:                if (vget(ITOV(ip)))
        !           119:                        goto loop;
        !           120:                *ipp = ip;
        !           121:                return(0);
        !           122:        }
        !           123:        /*
        !           124:         * Allocate a new inode.
        !           125:         */
        !           126:        if (error = getnewvnode(VT_ISOFS, mntp, &isofs_vnodeops, &nvp)) {
        !           127:                *ipp = 0;
        !           128:                return (error);
        !           129:        }
        !           130:        ip = VTOI(nvp);
        !           131:        ip->i_vnode = nvp;
        !           132:        ip->i_flag = 0;
        !           133:        ip->i_devvp = 0;
        !           134:        ip->i_diroff = 0;
        !           135:        ip->i_lockf = 0;
        !           136:        /*
        !           137:         * Put it onto its hash chain and lock it so that other requests for
        !           138:         * this inode will block if they arrive while we are sleeping waiting
        !           139:         * for old data structures to be purged or for the contents of the
        !           140:         * disk portion of this inode to be read.
        !           141:         */
        !           142:        ip->i_dev = dev;
        !           143:        ip->i_number = ino;
        !           144:        insque(ip, ih);
        !           145:        ISO_ILOCK(ip);
        !           146: 
        !           147:        ip->iso_reclen = isonum_711 (isodir->length);
        !           148:        ip->iso_extlen = isonum_711 (isodir->ext_attr_length);
        !           149:        ip->iso_extent = isonum_733 (isodir->extent);
        !           150:        ip->i_size = isonum_733 (isodir->size);
        !           151:        bcopy (isodir->date, ip->iso_time, sizeof ip->iso_time);
        !           152:        ip->iso_flags = isonum_711 (isodir->flags);
        !           153:        ip->iso_unit_size = isonum_711 (isodir->file_unit_size);
        !           154:        ip->iso_interleave_gap = isonum_711 (isodir->interleave);
        !           155:        ip->iso_volume_seq = isonum_723 (isodir->volume_sequence_number);
        !           156:        ip->iso_namelen = isonum_711 (isodir->name_len);
        !           157: 
        !           158:        /*
        !           159:         * Initialize the associated vnode
        !           160:         */
        !           161:        vp = ITOV(ip);
        !           162: 
        !           163:        if (ip->iso_flags & 2)
        !           164:                vp->v_type = VDIR;
        !           165:        else
        !           166:                vp->v_type = VREG;
        !           167: 
        !           168:        imp = VFSTOISOFS (mntp);
        !           169: 
        !           170:        if (ino == imp->root_extent)
        !           171:                vp->v_flag |= VROOT;
        !           172:        /*
        !           173:         * Finish inode initialization.
        !           174:         */
        !           175:        ip->i_mnt = imp;
        !           176:        ip->i_devvp = imp->im_devvp;
        !           177:        VREF(ip->i_devvp);
        !           178:        *ipp = ip;
        !           179:        return (0);
        !           180: }
        !           181: 
        !           182: /*
        !           183:  * Unlock and decrement the reference count of an inode structure.
        !           184:  */
        !           185: iso_iput(ip)
        !           186:        register struct iso_node *ip;
        !           187: {
        !           188: 
        !           189:        if ((ip->i_flag & ILOCKED) == 0)
        !           190:                panic("iso_iput");
        !           191:        ISO_IUNLOCK(ip);
        !           192:        vrele(ITOV(ip));
        !           193: }
        !           194: 
        !           195: /*
        !           196:  * Last reference to an inode, write the inode out and if necessary,
        !           197:  * truncate and deallocate the file.
        !           198:  */
        !           199: isofs_inactive(vp, p)
        !           200:        struct vnode *vp;
        !           201:        struct proc *p;
        !           202: {
        !           203:        register struct iso_node *ip = VTOI(vp);
        !           204:        int mode, error = 0;
        !           205: 
        !           206:        if (prtactive && vp->v_usecount != 0)
        !           207:                vprint("isofs_inactive: pushing active", vp);
        !           208: 
        !           209:        ip->i_flag = 0;
        !           210:        /*
        !           211:         * If we are done with the inode, reclaim it
        !           212:         * so that it can be reused immediately.
        !           213:         */
        !           214:        if (vp->v_usecount == 0 /* && ip->i_mode == 0 */)
        !           215:                vgone(vp);
        !           216:        return (error);
        !           217: }
        !           218: 
        !           219: /*
        !           220:  * Reclaim an inode so that it can be used for other purposes.
        !           221:  */
        !           222: isofs_reclaim(vp)
        !           223:        register struct vnode *vp;
        !           224: {
        !           225:        register struct iso_node *ip = VTOI(vp);
        !           226:        int i;
        !           227: 
        !           228:        if (prtactive && vp->v_usecount != 0)
        !           229:                vprint("isofs_reclaim: pushing active", vp);
        !           230:        /*
        !           231:         * Remove the inode from its hash chain.
        !           232:         */
        !           233:        remque(ip);
        !           234:        ip->i_forw = ip;
        !           235:        ip->i_back = ip;
        !           236:        /*
        !           237:         * Purge old data structures associated with the inode.
        !           238:         */
        !           239:        cache_purge(vp);
        !           240:        if (ip->i_devvp) {
        !           241:                vrele(ip->i_devvp);
        !           242:                ip->i_devvp = 0;
        !           243:        }
        !           244:        ip->i_flag = 0;
        !           245:        return (0);
        !           246: }
        !           247: 
        !           248: /*
        !           249:  * Lock an inode. If its already locked, set the WANT bit and sleep.
        !           250:  */
        !           251: iso_ilock(ip)
        !           252:        register struct iso_node *ip;
        !           253: {
        !           254: 
        !           255:        while (ip->i_flag & ILOCKED) {
        !           256:                ip->i_flag |= IWANT;
        !           257:                if (ip->i_spare0 == curproc->p_pid)
        !           258:                        panic("locking against myself");
        !           259:                ip->i_spare1 = curproc->p_pid;
        !           260:                (void) sleep((caddr_t)ip, PINOD);
        !           261:        }
        !           262:        ip->i_spare1 = 0;
        !           263:        ip->i_spare0 = curproc->p_pid;
        !           264:        ip->i_flag |= ILOCKED;
        !           265: }
        !           266: 
        !           267: /*
        !           268:  * Unlock an inode.  If WANT bit is on, wakeup.
        !           269:  */
        !           270: iso_iunlock(ip)
        !           271:        register struct iso_node *ip;
        !           272: {
        !           273: 
        !           274:        if ((ip->i_flag & ILOCKED) == 0)
        !           275:                vprint("iso_iunlock: unlocked inode", ITOV(ip));
        !           276:        ip->i_spare0 = 0;
        !           277:        ip->i_flag &= ~ILOCKED;
        !           278:        if (ip->i_flag&IWANT) {
        !           279:                ip->i_flag &= ~IWANT;
        !           280:                wakeup((caddr_t)ip);
        !           281:        }
        !           282: }

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