/* * Copyright (c) 1999, 2000 * Adrian Chadd * * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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. * * @(#)ffs_vnops.c 8.15 (Berkeley) 5/14/95 * $FreeBSD$ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* IFS debugging */ #undef DEBUG_IFS_READDIR /* Declare our trampling into the FFS code */ extern int ffs_fsync (struct vop_fsync_args *); static int ffs_getpages(struct vop_getpages_args *); static int ffs_putpages(struct vop_putpages_args *); static int ffs_read(struct vop_read_args *); static int ffs_write(struct vop_write_args *); static int ifs_noop(struct vop_generic_args *); static int ifs_getattr(struct vop_getattr_args *); static int ifs_create(struct vop_create_args *); static int ifs_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *); static int ifs_remove(struct vop_remove_args *); static int ifs_readdir(struct vop_readdir_args *); static int ifs_dirremove(struct vnode *, struct inode *, int, int); /* Global vfs data structures for ifs. */ vop_t **ifs_vnodeop_p; static struct vnodeopv_entry_desc ifs_vnodeop_entries[] = { { &vop_default_desc, (vop_t *) ufs_vnoperate }, { &vop_fsync_desc, (vop_t *) ffs_fsync }, { &vop_getpages_desc, (vop_t *) ffs_getpages }, { &vop_putpages_desc, (vop_t *) ffs_putpages }, { &vop_read_desc, (vop_t *) ffs_read }, { &vop_balloc_desc, (vop_t *) ffs_balloc }, { &vop_reallocblks_desc, (vop_t *) ffs_reallocblks }, { &vop_write_desc, (vop_t *) ffs_write }, { &vop_lookup_desc, (vop_t *) ifs_lookup }, { &vop_getattr_desc, (vop_t *) ifs_getattr }, { &vop_create_desc, (vop_t *) ifs_create }, { &vop_remove_desc, (vop_t *) ifs_remove }, { &vop_readdir_desc, (vop_t *) ifs_readdir }, /* NULL operations for ifs */ { &vop_cachedlookup_desc, (vop_t *) ifs_noop }, { &vop_mkdir_desc, (vop_t *) ifs_noop }, { &vop_mknod_desc, (vop_t *) ifs_noop }, { &vop_readlink_desc, (vop_t *) ifs_noop }, { &vop_rename_desc, (vop_t *) ifs_noop }, { &vop_rmdir_desc, (vop_t *) ifs_noop }, { &vop_symlink_desc, (vop_t *) ifs_noop }, { &vop_link_desc, (vop_t *) ifs_noop }, { &vop_whiteout_desc, (vop_t *) ifs_noop }, { NULL, NULL } }; static struct vnodeopv_desc ifs_vnodeop_opv_desc = { &ifs_vnodeop_p, ifs_vnodeop_entries }; vop_t **ifs_specop_p; static struct vnodeopv_entry_desc ifs_specop_entries[] = { { &vop_default_desc, (vop_t *) ufs_vnoperatespec }, { &vop_fsync_desc, (vop_t *) ffs_fsync }, { NULL, NULL } }; static struct vnodeopv_desc ifs_specop_opv_desc = { &ifs_specop_p, ifs_specop_entries }; vop_t **ifs_fifoop_p; static struct vnodeopv_entry_desc ifs_fifoop_entries[] = { { &vop_default_desc, (vop_t *) ufs_vnoperatefifo }, { &vop_fsync_desc, (vop_t *) ffs_fsync }, { NULL, NULL } }; static struct vnodeopv_desc ifs_fifoop_opv_desc = { &ifs_fifoop_p, ifs_fifoop_entries }; VNODEOP_SET(ifs_vnodeop_opv_desc); VNODEOP_SET(ifs_specop_opv_desc); VNODEOP_SET(ifs_fifoop_opv_desc); #include static int ifs_noop(ap) struct vop_generic_args *ap; { return EOPNOTSUPP; } /* ARGSUSED */ static int ifs_getattr(ap) struct vop_getattr_args /* { struct vnode *a_vp; struct vattr *a_vap; struct ucred *a_cred; struct proc *a_p; } */ *ap; { register struct vnode *vp = ap->a_vp; register struct inode *ip = VTOI(vp); register struct vattr *vap = ap->a_vap; ufs_itimes(vp); /* * Copy from inode table */ vap->va_fsid = dev2udev(ip->i_dev); vap->va_fileid = ip->i_number; vap->va_mode = ip->i_mode & ~IFMT; vap->va_nlink = VFSTOUFS(vp->v_mount)->um_i_effnlink_valid ? ip->i_effnlink : ip->i_nlink; vap->va_uid = ip->i_uid; vap->va_gid = ip->i_gid; vap->va_rdev = ip->i_rdev; vap->va_size = ip->i_din.di_size; vap->va_atime.tv_sec = ip->i_atime; vap->va_atime.tv_nsec = ip->i_atimensec; vap->va_mtime.tv_sec = ip->i_mtime; vap->va_mtime.tv_nsec = ip->i_mtimensec; vap->va_ctime.tv_sec = ip->i_ctime; vap->va_ctime.tv_nsec = ip->i_ctimensec; vap->va_flags = ip->i_flags; vap->va_gen = ip->i_gen; vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; vap->va_bytes = dbtob((u_quad_t)ip->i_blocks); vap->va_type = IFTOVT(ip->i_mode); vap->va_filerev = ip->i_modrev; return (0); } /* * Create a regular file */ int ifs_create(ap) struct vop_create_args /* { struct vnode *a_dvp; struct vnode **a_vpp; struct componentname *a_cnp; struct vattr *a_vap; } */ *ap; { int error; error = ifs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), ap->a_dvp, ap->a_vpp, ap->a_cnp); if (error) return (error); VN_POLLEVENT(ap->a_dvp, POLLWRITE); return (0); } /* * Allocate a new inode. */ int ifs_makeinode(mode, dvp, vpp, cnp) int mode; struct vnode *dvp; struct vnode **vpp; struct componentname *cnp; { register struct inode *ip, *pdir; struct vnode *tvp; int error; pdir = VTOI(dvp); #ifdef DIAGNOSTIC if ((cnp->cn_flags & HASBUF) == 0) panic("ifs_makeinode: no name"); #endif *vpp = NULL; if ((mode & IFMT) == 0) mode |= IFREG; error = UFS_VALLOC(dvp, mode, cnp->cn_cred, &tvp); if (error) { zfree(namei_zone, cnp->cn_pnbuf); return (error); } ip = VTOI(tvp); ip->i_gid = pdir->i_gid; ip->i_uid = cnp->cn_cred->cr_uid; #ifdef QUOTA if ((error = getinoquota(ip)) || (error = chkiq(ip, 1, cnp->cn_cred, 0))) { UFS_VFREE(tvp, ip->i_number, mode); vput(tvp); return (error); } #endif ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; ip->i_mode = mode; tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ ip->i_effnlink = 1; ip->i_nlink = 1; if (DOINGSOFTDEP(tvp)) softdep_change_linkcnt(ip); if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred) && suser_xxx(cnp->cn_cred, 0, 0)) ip->i_mode &= ~ISGID; if (cnp->cn_flags & ISWHITEOUT) ip->i_flags |= UF_OPAQUE; /* * Make sure inode goes to disk before directory entry. */ error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) | DOINGASYNC(tvp))); if (error) goto bad; *vpp = tvp; return (0); bad: /* * Write error occurred trying to update the inode * or the directory so must deallocate the inode. */ ip->i_effnlink = 0; ip->i_nlink = 0; ip->i_flag |= IN_CHANGE; if (DOINGSOFTDEP(tvp)) softdep_change_linkcnt(ip); vput(tvp); return (error); } int ifs_remove(ap) struct vop_remove_args /* { struct vnode *a_dvp; struct vnode *a_vp; struct componentname *a_cnp; } */ *ap; { struct inode *ip; struct vnode *vp = ap->a_vp; struct vnode *dvp = ap->a_dvp; int error; ip = VTOI(vp); if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || (VTOI(dvp)->i_flags & APPEND)) { error = EPERM; goto out; } error = ifs_dirremove(dvp, ip, ap->a_cnp->cn_flags, 0); VN_POLLEVENT(vp, POLLNLINK); out: return (error); } /* * highly cutdown ufs_dirremove, since we're not updating * any directory entries. :-) */ static int ifs_dirremove(struct vnode *dvp, struct inode *ip, int flags, int isrmdir) { int error; if (ip) { ip->i_effnlink--; ip->i_flag |= IN_CHANGE; ip->i_nlink--; error = 0; } else error = ENOENT; return (error); } /* * ifs_readdir * * Do the directory listing, representing the allocated inodes * making up this filesystem. * */ static int ifs_readdir(ap) struct vop_readdir_args /* { struct vnode *a_vp; struct uio *a_uio; struct ucred *a_cred; int *a_eofflag; int *ncookies; u_long **a_cookies; } */ *ap; { int inodenum; struct dirent *dent, *lastdp = NULL; struct dirent *tmpdp; char *dirbuf; struct inode *ip = VTOI(ap->a_vp); /* To get the mount info later */ struct mount *mp = ap->a_vp->v_mount; struct fs *fs = VFSTOUFS(mp)->um_fs; int maxnuminode = fs->fs_ncg * fs->fs_ipg; int error = 0; int count; int dircount = 0; int copylen = 0; char iret; /* * Get the offset, which represents the inode we're going to * start from */ inodenum = ap->a_uio->uio_offset; #ifdef DEBUG_IFS_READDIR printf("ifs_readdir: starting with inode %d\n", inodenum); #endif if (inodenum < 0) return EINVAL; /* * Next, get the buffer size, round it down to a dirent, and * figure out how many allocated inodes we need to match */ count = ap->a_uio->uio_resid; /* * Next, create a dirbuf to fill with directory entries */ MALLOC(tmpdp, struct dirent *, sizeof (struct dirent), M_TEMP, M_WAITOK); MALLOC(dirbuf, char *, count, M_TEMP, M_WAITOK); dent = (struct dirent *)dirbuf; /* now, keep reading until we run out of inodes */ while (inodenum <= maxnuminode) { /* Get bitmap info and see if we bother with this cg */ iret = ifs_isinodealloc(ip, inodenum); if (iret == IFS_INODE_EMPTYCG) { /* Skip this CG */ /* Next cg please */ inodenum -= inodenum % fs->fs_ipg; inodenum += fs->fs_ipg; continue; } /* Allocated and not special? */ if ((inodenum > 2) && iret == IFS_INODE_ISALLOC) { /* Create a new entry */ sprintf(tmpdp->d_name, "%d", inodenum); tmpdp->d_fileno = inodenum; tmpdp->d_type = DT_REG; tmpdp->d_namlen = strlen(tmpdp->d_name); tmpdp->d_reclen = DIRECTSIZ(tmpdp->d_namlen); /* Make sure we have enough space for this entry */ if (tmpdp->d_reclen > count) break; /* Copy it to the given buffer */ bcopy(tmpdp, dent, tmpdp->d_reclen); /* Decrement the count */ count -= dent->d_reclen; copylen += dent->d_reclen; lastdp = dent; /* Increment the offset pointer */ dent = (struct dirent *)((char *)dent + dent->d_reclen); dircount++; } /* Increment the inode number we are checking */ inodenum++; } /* End */ #ifdef DEBUG_IFS_READDIR printf("ifs_readdir: copied %d directories\n", dircount); #endif /* * Get the last dent updated, and make the record d_reclen last the whole * buffer. */ if (lastdp != NULL) { /* Update the length of the last entry */ lastdp->d_reclen += count; } /* Copy the data out */ #ifdef DEBUG_IFS_READDIR printf("ifs_readdir: copied %d bytes\n", copylen); #endif error = uiomove(dirbuf, copylen, ap->a_uio); /* Free memory we've used */ FREE(dirbuf, M_TEMP); FREE(tmpdp, M_TEMP); /* Set uio_offset to the last inode number */ ap->a_uio->uio_offset = inodenum; /* Handle EOF/eofflag */ if ((inodenum >= maxnuminode) && (ap->a_eofflag != NULL)) { *ap->a_eofflag = 1; #ifdef DEBUG_IFS_READDIR printf("ifs_readdir: setting EOF flag\n"); #endif } #ifdef DEBUG_IFS_READDIR printf("ifs_readdir: new offset: %d\n", inodenum); #endif return error; }