| | 1 | /* |
| | 2 | * Copyright (c) 1991 Regents of the University of California. |
| | 3 | * All rights reserved. |
| | 4 | * |
| | 5 | * %sccs.include.redist.c% |
| | 6 | * |
| | 7 | * @(#)ufs_inode.c 7.42 (Berkeley) %G% |
| | 8 | */ |
| | 9 | |
| | 10 | #include <sys/param.h> |
| | 11 | #include <sys/systm.h> |
| | 12 | #include <sys/proc.h> |
| | 13 | #include <sys/vnode.h> |
| | 14 | #include <sys/mount.h> |
| | 15 | #include <sys/kernel.h> |
| | 16 | |
| | 17 | #include <ufs/ufs/quota.h> |
| | 18 | #include <ufs/ufs/inode.h> |
| | 19 | #include <ufs/ufs/ufsmount.h> |
| | 20 | #include <ufs/ufs/ufs_extern.h> |
| | 21 | |
| | 22 | u_long nextgennumber; /* Next generation number to assign. */ |
| | 23 | int prtactive = 0; /* 1 => print out reclaim of active vnodes */ |
| | 24 | |
| | 25 | int |
| | 26 | ufs_init() |
| | 27 | { |
| | 28 | static int first = 1; |
| | 29 | |
| | 30 | if (!first) |
| | 31 | return (0); |
| | 32 | first = 0; |
| | 33 | |
| | 34 | #ifdef DIAGNOSTIC |
| | 35 | if (VN_MAXPRIVATE < sizeof(struct inode)) |
| | 36 | panic("ufs_init: inode too small"); |
| | 37 | #endif |
| | 38 | ufs_ihashinit(); |
| | 39 | dqinit(); |
| | 40 | return (0); |
| | 41 | } |
| | 42 | |
| | 43 | /* |
| | 44 | * Unlock and decrement the reference count of an inode structure. |
| | 45 | */ |
| | 46 | void |
| | 47 | ufs_iput(ip) |
| | 48 | register struct inode *ip; |
| | 49 | { |
| | 50 | |
| | 51 | if ((ip->i_flag & ILOCKED) == 0) |
| | 52 | panic("iput"); |
| | 53 | IUNLOCK(ip); |
| | 54 | vrele(ITOV(ip)); |
| | 55 | } |
| | 56 | |
| | 57 | /* |
| | 58 | * Reclaim an inode so that it can be used for other purposes. |
| | 59 | */ |
| | 60 | int |
| | 61 | ufs_reclaim(vp) |
| | 62 | register struct vnode *vp; |
| | 63 | { |
| | 64 | register struct inode *ip; |
| | 65 | int i; |
| | 66 | |
| | 67 | if (prtactive && vp->v_usecount != 0) |
| | 68 | vprint("ufs_reclaim: pushing active", vp); |
| | 69 | /* |
| | 70 | * Remove the inode from its hash chain. |
| | 71 | */ |
| | 72 | ip = VTOI(vp); |
| | 73 | remque(ip); |
| | 74 | ip->i_forw = ip; |
| | 75 | ip->i_back = ip; |
| | 76 | /* |
| | 77 | * Purge old data structures associated with the inode. |
| | 78 | */ |
| | 79 | cache_purge(vp); |
| | 80 | if (ip->i_devvp) { |
| | 81 | vrele(ip->i_devvp); |
| | 82 | ip->i_devvp = 0; |
| | 83 | } |
| | 84 | #ifdef QUOTA |
| | 85 | for (i = 0; i < MAXQUOTAS; i++) { |
| | 86 | if (ip->i_dquot[i] != NODQUOT) { |
| | 87 | dqrele(vp, ip->i_dquot[i]); |
| | 88 | ip->i_dquot[i] = NODQUOT; |
| | 89 | } |
| | 90 | } |
| | 91 | #endif |
| | 92 | ip->i_flag = 0; |
| | 93 | return (0); |
| | 94 | } |
| | 95 | |
| | 96 | /* |
| | 97 | * Lock an inode. If its already locked, set the WANT bit and sleep. |
| | 98 | */ |
| | 99 | void |
| | 100 | ufs_ilock(ip) |
| | 101 | register struct inode *ip; |
| | 102 | { |
| | 103 | |
| | 104 | while (ip->i_flag & ILOCKED) { |
| | 105 | ip->i_flag |= IWANT; |
| | 106 | if (ip->i_spare0 == curproc->p_pid) |
| | 107 | panic("locking against myself"); |
| | 108 | ip->i_spare1 = curproc->p_pid; |
| | 109 | (void) sleep((caddr_t)ip, PINOD); |
| | 110 | } |
| | 111 | ip->i_spare1 = 0; |
| | 112 | ip->i_spare0 = curproc->p_pid; |
| | 113 | ip->i_flag |= ILOCKED; |
| | 114 | curproc->p_spare[2]++; |
| | 115 | } |
| | 116 | |
| | 117 | /* |
| | 118 | * Unlock an inode. If WANT bit is on, wakeup. |
| | 119 | */ |
| | 120 | void |
| | 121 | ufs_iunlock(ip) |
| | 122 | register struct inode *ip; |
| | 123 | { |
| | 124 | |
| | 125 | if ((ip->i_flag & ILOCKED) == 0) |
| | 126 | vprint("ufs_iunlock: unlocked inode", ITOV(ip)); |
| | 127 | ip->i_spare0 = 0; |
| | 128 | ip->i_flag &= ~ILOCKED; |
| | 129 | curproc->p_spare[2]--; |
| | 130 | if (ip->i_flag&IWANT) { |
| | 131 | ip->i_flag &= ~IWANT; |
| | 132 | wakeup((caddr_t)ip); |
| | 133 | } |
| | 134 | } |
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