1 /* 2 * Copyright (c) 1991 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)lfs_alloc.c 7.54 (Berkeley) 09/02/92 8 */ 9 10 #include <sys/param.h> 11 #include <sys/kernel.h> 12 #include <sys/buf.h> 13 #include <sys/vnode.h> 14 #include <sys/syslog.h> 15 #include <sys/mount.h> 16 #include <sys/malloc.h> 17 18 #include <vm/vm.h> 19 20 #include <ufs/ufs/quota.h> 21 #include <ufs/ufs/inode.h> 22 #include <ufs/ufs/ufsmount.h> 23 24 #include <ufs/lfs/lfs.h> 25 #include <ufs/lfs/lfs_extern.h> 26 27 extern u_long nextgennumber; 28 29 /* Allocate a new inode. */ 30 /* ARGSUSED */ 31 int 32 lfs_valloc(ap) 33 struct vop_valloc_args /* { 34 struct vnode *a_pvp; 35 int a_mode; 36 struct ucred *a_cred; 37 struct vnode **a_vpp; 38 } */ *ap; 39 { 40 struct lfs *fs; 41 struct buf *bp; 42 struct ifile *ifp; 43 struct inode *ip; 44 struct vnode *vp; 45 daddr_t blkno; 46 ino_t new_ino; 47 u_long i, max; 48 int bb, error; 49 50 /* Get the head of the freelist. */ 51 fs = VTOI(ap->a_pvp)->i_lfs; 52 new_ino = fs->lfs_free; 53 #ifdef ALLOCPRINT 54 printf("lfs_ialloc: allocate inode %d\n", new_ino); 55 #endif 56 57 /* 58 * Remove the inode from the free list and write the new start 59 * of the free list into the superblock. 60 */ 61 LFS_IENTRY(ifp, fs, new_ino, bp); 62 if (ifp->if_daddr != LFS_UNUSED_DADDR) 63 panic("lfs_ialloc: inuse inode on the free list"); 64 fs->lfs_free = ifp->if_nextfree; 65 brelse(bp); 66 67 /* Extend IFILE so that the next lfs_valloc will succeed. */ 68 if (fs->lfs_free == LFS_UNUSED_INUM) { 69 bb = fsbtodb(fs, 1); 70 if (!ISSPACE(fs, bb, ap->a_cred)) 71 return(ENOSPC); 72 vp = fs->lfs_ivnode; 73 ip = VTOI(vp); 74 blkno = lblkno(fs, ip->i_size); 75 bp = getblk(vp, blkno, fs->lfs_bsize); 76 i = (blkno - fs->lfs_segtabsz - fs->lfs_cleansz) * 77 fs->lfs_ifpb; 78 fs->lfs_free = i; 79 max = i + fs->lfs_ifpb; 80 for (ifp = (struct ifile *)bp->b_un.b_words; i < max; ++ifp) { 81 ifp->if_version = 1; 82 ifp->if_daddr = LFS_UNUSED_DADDR; 83 ifp->if_nextfree = ++i; 84 } 85 ifp--; 86 ifp->if_nextfree = LFS_UNUSED_INUM; 87 88 ip->i_blocks += btodb(fs->lfs_bsize); 89 fs->lfs_bfree -= btodb(fs->lfs_bsize); 90 ip->i_size += fs->lfs_bsize; 91 vnode_pager_setsize(vp, (u_long)ip->i_size); 92 vnode_pager_uncache(vp); 93 if (error = VOP_BWRITE(bp)) 94 return (error); 95 } 96 97 /* Create a vnode to associate with the inode. */ 98 if (error = lfs_vcreate(ap->a_pvp->v_mount, new_ino, &vp)) 99 return (error); 100 *ap->a_vpp = vp; 101 vp->v_flag |= VDIROP; 102 ip = VTOI(vp); 103 VREF(ip->i_devvp); 104 105 /* Zero out the direct and indirect block addresses. */ 106 bzero(ip->i_db, (NDADDR + NIADDR) * sizeof(daddr_t)); 107 108 /* Set a new generation number for this inode. */ 109 if (++nextgennumber < (u_long)time.tv_sec) 110 nextgennumber = time.tv_sec; 111 ip->i_gen = nextgennumber; 112 113 /* Insert into the inode hash table. */ 114 ufs_ihashins(ip); 115 116 /* Set superblock modified bit and increment file count. */ 117 fs->lfs_fmod = 1; 118 ++fs->lfs_nfiles; 119 return (0); 120 } 121 122 /* Create a new vnode/inode pair and initialize what fields we can. */ 123 int 124 lfs_vcreate(mp, ino, vpp) 125 struct mount *mp; 126 ino_t ino; 127 struct vnode **vpp; 128 { 129 extern int (**lfs_vnodeop_p)(); 130 struct inode *ip; 131 struct ufsmount *ump; 132 int error, i; 133 134 /* Create the vnode. */ 135 if (error = getnewvnode(VT_LFS, mp, lfs_vnodeop_p, vpp)) { 136 *vpp = NULL; 137 return (error); 138 } 139 140 /* Get a pointer to the private mount structure. */ 141 ump = VFSTOUFS(mp); 142 143 /* Initialize the inode. */ 144 MALLOC(ip, struct inode *, sizeof(struct inode), M_LFSNODE, M_WAITOK); 145 (*vpp)->v_data = ip; 146 ip->i_vnode = *vpp; 147 ip->i_devvp = ump->um_devvp; 148 ip->i_flag = IMOD; 149 ip->i_dev = ump->um_dev; 150 ip->i_number = ip->i_din.di_inum = ino; 151 ip->i_lfs = ump->um_lfs; 152 #ifdef QUOTA 153 for (i = 0; i < MAXQUOTAS; i++) 154 ip->i_dquot[i] = NODQUOT; 155 #endif 156 ip->i_lockf = 0; 157 ip->i_diroff = 0; 158 ip->i_mode = 0; 159 ip->i_size = 0; 160 ip->i_blocks = 0; 161 ++ump->um_lfs->lfs_uinodes; 162 return (0); 163 } 164 165 /* Free an inode. */ 166 /* ARGUSED */ 167 int 168 lfs_vfree(ap) 169 struct vop_vfree_args /* { 170 struct vnode *a_pvp; 171 ino_t a_ino; 172 int a_mode; 173 } */ *ap; 174 { 175 SEGUSE *sup; 176 struct buf *bp; 177 struct ifile *ifp; 178 struct inode *ip; 179 struct lfs *fs; 180 daddr_t old_iaddr; 181 ino_t ino; 182 int error; 183 184 /* Get the inode number and file system. */ 185 ip = VTOI(ap->a_pvp); 186 fs = ip->i_lfs; 187 ino = ip->i_number; 188 if (ip->i_flag & IMOD) { 189 --fs->lfs_uinodes; 190 ip->i_flag &= ~(IMOD | IACC | IUPD | ICHG); 191 } 192 /* 193 * Set the ifile's inode entry to unused, increment its version number 194 * and link it into the free chain. 195 */ 196 LFS_IENTRY(ifp, fs, ino, bp); 197 old_iaddr = ifp->if_daddr; 198 ifp->if_daddr = LFS_UNUSED_DADDR; 199 ++ifp->if_version; 200 ifp->if_nextfree = fs->lfs_free; 201 fs->lfs_free = ino; 202 (void) VOP_BWRITE(bp); 203 204 if (old_iaddr != LFS_UNUSED_DADDR) { 205 LFS_SEGENTRY(sup, fs, datosn(fs, old_iaddr), bp); 206 #ifdef DIAGNOSTIC 207 if (sup->su_nbytes < sizeof(struct dinode)) 208 panic("lfs_vfree: negative byte count (segment %d)\n", 209 datosn(fs, old_iaddr)); 210 #endif 211 sup->su_nbytes -= sizeof(struct dinode); 212 (void) VOP_BWRITE(bp); 213 } 214 215 /* Set superblock modified bit and decrement file count. */ 216 fs->lfs_fmod = 1; 217 --fs->lfs_nfiles; 218 return (0); 219 } 220