471 lines
12 KiB
C
471 lines
12 KiB
C
/*
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* Copyright (c) 1999, 2000
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* Adrian Chadd <adrian@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ffs_vnops.c 8.15 (Berkeley) 5/14/95
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/resourcevar.h>
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#include <sys/signalvar.h>
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#include <sys/kernel.h>
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#include <sys/stat.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/proc.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <sys/conf.h>
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#include <sys/poll.h>
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#include <sys/namei.h>
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#include <sys/malloc.h>
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#include <sys/dirent.h>
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#include <machine/limits.h>
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#include <vm/vm.h>
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#include <vm/vm_page.h>
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#include <vm/vm_object.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_zone.h>
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#include <ufs/ufs/extattr.h>
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#include <ufs/ufs/quota.h>
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#include <ufs/ufs/inode.h>
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#include <ufs/ufs/ufsmount.h>
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#include <ufs/ufs/ufs_extern.h>
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#include <ufs/ufs/dir.h>
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#include <ufs/ffs/fs.h>
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#include <ufs/ffs/ffs_extern.h>
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#include <ufs/ifs/ifs_extern.h>
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/* IFS debugging */
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#undef DEBUG_IFS_READDIR
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/* Declare our trampling into the FFS code */
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extern int ffs_fsync (struct vop_fsync_args *);
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static int ffs_getpages(struct vop_getpages_args *);
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static int ffs_read(struct vop_read_args *);
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static int ffs_write(struct vop_write_args *);
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static int ifs_noop(struct vop_generic_args *);
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static int ifs_getattr(struct vop_getattr_args *);
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static int ifs_create(struct vop_create_args *);
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static int ifs_makeinode(int mode, struct vnode *, struct vnode **,
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struct componentname *);
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static int ifs_remove(struct vop_remove_args *);
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static int ifs_readdir(struct vop_readdir_args *);
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static int ifs_dirremove(struct vnode *, struct inode *, int, int);
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/* Global vfs data structures for ifs. */
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vop_t **ifs_vnodeop_p;
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static struct vnodeopv_entry_desc ifs_vnodeop_entries[] = {
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{ &vop_default_desc, (vop_t *) ufs_vnoperate },
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{ &vop_fsync_desc, (vop_t *) ffs_fsync },
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{ &vop_getpages_desc, (vop_t *) ffs_getpages },
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{ &vop_read_desc, (vop_t *) ffs_read },
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{ &vop_reallocblks_desc, (vop_t *) ffs_reallocblks },
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{ &vop_write_desc, (vop_t *) ffs_write },
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{ &vop_lookup_desc, (vop_t *) ifs_lookup },
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{ &vop_getattr_desc, (vop_t *) ifs_getattr },
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{ &vop_create_desc, (vop_t *) ifs_create },
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{ &vop_remove_desc, (vop_t *) ifs_remove },
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{ &vop_readdir_desc, (vop_t *) ifs_readdir },
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/* NULL operations for ifs */
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{ &vop_cachedlookup_desc, (vop_t *) ifs_noop },
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{ &vop_mkdir_desc, (vop_t *) ifs_noop },
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{ &vop_mknod_desc, (vop_t *) ifs_noop },
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{ &vop_readlink_desc, (vop_t *) ifs_noop },
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{ &vop_rename_desc, (vop_t *) ifs_noop },
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{ &vop_rmdir_desc, (vop_t *) ifs_noop },
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{ &vop_symlink_desc, (vop_t *) ifs_noop },
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{ &vop_link_desc, (vop_t *) ifs_noop },
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{ &vop_whiteout_desc, (vop_t *) ifs_noop },
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{ NULL, NULL }
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};
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static struct vnodeopv_desc ifs_vnodeop_opv_desc =
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{ &ifs_vnodeop_p, ifs_vnodeop_entries };
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vop_t **ifs_specop_p;
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static struct vnodeopv_entry_desc ifs_specop_entries[] = {
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{ &vop_default_desc, (vop_t *) ufs_vnoperatespec },
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{ &vop_fsync_desc, (vop_t *) ffs_fsync },
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{ NULL, NULL }
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};
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static struct vnodeopv_desc ifs_specop_opv_desc =
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{ &ifs_specop_p, ifs_specop_entries };
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vop_t **ifs_fifoop_p;
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static struct vnodeopv_entry_desc ifs_fifoop_entries[] = {
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{ &vop_default_desc, (vop_t *) ufs_vnoperatefifo },
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{ &vop_fsync_desc, (vop_t *) ffs_fsync },
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{ NULL, NULL }
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};
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static struct vnodeopv_desc ifs_fifoop_opv_desc =
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{ &ifs_fifoop_p, ifs_fifoop_entries };
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VNODEOP_SET(ifs_vnodeop_opv_desc);
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VNODEOP_SET(ifs_specop_opv_desc);
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VNODEOP_SET(ifs_fifoop_opv_desc);
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#include <ufs/ufs/ufs_readwrite.c>
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static int
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ifs_noop(ap)
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struct vop_generic_args *ap;
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{
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return EOPNOTSUPP;
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}
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/* ARGSUSED */
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static int
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ifs_getattr(ap)
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struct vop_getattr_args /* {
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struct vnode *a_vp;
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struct vattr *a_vap;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap;
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{
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register struct vnode *vp = ap->a_vp;
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register struct inode *ip = VTOI(vp);
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register struct vattr *vap = ap->a_vap;
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ufs_itimes(vp);
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/*
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* Copy from inode table
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*/
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vap->va_fsid = dev2udev(ip->i_dev);
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vap->va_fileid = ip->i_number;
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vap->va_mode = ip->i_mode & ~IFMT;
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vap->va_nlink = VFSTOUFS(vp->v_mount)->um_i_effnlink_valid ?
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ip->i_effnlink : ip->i_nlink;
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vap->va_uid = ip->i_uid;
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vap->va_gid = ip->i_gid;
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vap->va_rdev = ip->i_rdev;
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vap->va_size = ip->i_din.di_size;
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vap->va_atime.tv_sec = ip->i_atime;
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vap->va_atime.tv_nsec = ip->i_atimensec;
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vap->va_mtime.tv_sec = ip->i_mtime;
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vap->va_mtime.tv_nsec = ip->i_mtimensec;
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vap->va_ctime.tv_sec = ip->i_ctime;
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vap->va_ctime.tv_nsec = ip->i_ctimensec;
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vap->va_flags = ip->i_flags;
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vap->va_gen = ip->i_gen;
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vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
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vap->va_bytes = dbtob((u_quad_t)ip->i_blocks);
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vap->va_type = IFTOVT(ip->i_mode);
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vap->va_filerev = ip->i_modrev;
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return (0);
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}
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/*
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* Create a regular file
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*/
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int
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ifs_create(ap)
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struct vop_create_args /* {
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struct vnode *a_dvp;
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struct vnode **a_vpp;
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struct componentname *a_cnp;
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struct vattr *a_vap;
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} */ *ap;
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{
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int error;
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error =
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ifs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
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ap->a_dvp, ap->a_vpp, ap->a_cnp);
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if (error)
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return (error);
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VN_POLLEVENT(ap->a_dvp, POLLWRITE);
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return (0);
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}
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/*
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* Allocate a new inode.
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*/
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int
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ifs_makeinode(mode, dvp, vpp, cnp)
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int mode;
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struct vnode *dvp;
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struct vnode **vpp;
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struct componentname *cnp;
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{
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register struct inode *ip, *pdir;
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struct vnode *tvp;
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int error;
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pdir = VTOI(dvp);
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#ifdef DIAGNOSTIC
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if ((cnp->cn_flags & HASBUF) == 0)
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panic("ifs_makeinode: no name");
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#endif
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*vpp = NULL;
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if ((mode & IFMT) == 0)
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mode |= IFREG;
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error = UFS_VALLOC(dvp, mode, cnp->cn_cred, &tvp);
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if (error) {
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zfree(namei_zone, cnp->cn_pnbuf);
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return (error);
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}
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ip = VTOI(tvp);
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ip->i_gid = pdir->i_gid;
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ip->i_uid = cnp->cn_cred->cr_uid;
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#ifdef QUOTA
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if ((error = getinoquota(ip)) ||
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(error = chkiq(ip, 1, cnp->cn_cred, 0))) {
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UFS_VFREE(tvp, ip->i_number, mode);
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vput(tvp);
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return (error);
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}
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#endif
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ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
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ip->i_mode = mode;
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tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
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ip->i_effnlink = 1;
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ip->i_nlink = 1;
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if (DOINGSOFTDEP(tvp))
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softdep_change_linkcnt(ip);
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if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred) &&
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suser_xxx(cnp->cn_cred, 0, 0))
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ip->i_mode &= ~ISGID;
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if (cnp->cn_flags & ISWHITEOUT)
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ip->i_flags |= UF_OPAQUE;
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/*
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* Make sure inode goes to disk before directory entry.
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*/
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error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) | DOINGASYNC(tvp)));
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if (error)
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goto bad;
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*vpp = tvp;
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return (0);
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bad:
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/*
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* Write error occurred trying to update the inode
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* or the directory so must deallocate the inode.
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*/
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ip->i_effnlink = 0;
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ip->i_nlink = 0;
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ip->i_flag |= IN_CHANGE;
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if (DOINGSOFTDEP(tvp))
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softdep_change_linkcnt(ip);
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vput(tvp);
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return (error);
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}
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int
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ifs_remove(ap)
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struct vop_remove_args /* {
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struct vnode *a_dvp;
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struct vnode *a_vp;
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struct componentname *a_cnp;
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} */ *ap;
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{
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struct inode *ip;
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struct vnode *vp = ap->a_vp;
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struct vnode *dvp = ap->a_dvp;
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int error;
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ip = VTOI(vp);
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if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
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(VTOI(dvp)->i_flags & APPEND)) {
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error = EPERM;
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goto out;
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}
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error = ifs_dirremove(dvp, ip, ap->a_cnp->cn_flags, 0);
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VN_POLLEVENT(vp, POLLNLINK);
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out:
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return (error);
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}
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/*
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* highly cutdown ufs_dirremove, since we're not updating
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* any directory entries. :-)
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*/
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static int
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ifs_dirremove(struct vnode *dvp, struct inode *ip, int flags, int isrmdir)
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{
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int error;
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if (ip) {
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ip->i_effnlink--;
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ip->i_flag |= IN_CHANGE;
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ip->i_nlink--;
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error = 0;
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} else
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error = ENOENT;
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return (error);
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}
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/*
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* ifs_readdir
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*
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* Do the directory listing, representing the allocated inodes
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* making up this filesystem.
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*
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*/
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static int
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ifs_readdir(ap)
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struct vop_readdir_args /* {
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struct vnode *a_vp;
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struct uio *a_uio;
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struct ucred *a_cred;
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int *a_eofflag;
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int *ncookies;
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u_long **a_cookies;
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} */ *ap;
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{
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int inodenum;
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struct dirent *dent, *lastdp = NULL;
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struct dirent *tmpdp;
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char *dirbuf;
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struct inode *ip = VTOI(ap->a_vp); /* To get the mount info later */
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struct mount *mp = ap->a_vp->v_mount;
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struct fs *fs = VFSTOUFS(mp)->um_fs;
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int maxnuminode = fs->fs_ncg * fs->fs_ipg;
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int error = 0;
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int count;
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int dircount = 0;
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int copylen = 0;
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char iret;
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/*
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* Get the offset, which represents the inode we're going to
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* start from
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*/
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inodenum = ap->a_uio->uio_offset;
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#ifdef DEBUG_IFS_READDIR
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printf("ifs_readdir: starting with inode %d\n", inodenum);
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#endif
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if (inodenum < 0)
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return EINVAL;
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/*
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* Next, get the buffer size, round it down to a dirent, and
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* figure out how many allocated inodes we need to match
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*/
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count = ap->a_uio->uio_resid;
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/*
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* Next, create a dirbuf to fill with directory entries
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*/
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MALLOC(tmpdp, struct dirent *, sizeof (struct dirent), M_TEMP, M_WAITOK);
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MALLOC(dirbuf, char *, count, M_TEMP, M_WAITOK);
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dent = (struct dirent *)dirbuf;
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/* now, keep reading until we run out of inodes */
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while (inodenum <= maxnuminode) {
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/* Get bitmap info and see if we bother with this cg */
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iret = ifs_isinodealloc(ip, inodenum);
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if (iret == IFS_INODE_EMPTYCG) {
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/* Skip this CG */
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/* Next cg please */
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inodenum -= inodenum % fs->fs_ipg;
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inodenum += fs->fs_ipg;
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continue;
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}
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/* Allocated and not special? */
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if ((inodenum > 2) && iret == IFS_INODE_ISALLOC) {
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/* Create a new entry */
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sprintf(tmpdp->d_name, "%d", inodenum);
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tmpdp->d_fileno = inodenum;
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tmpdp->d_type = DT_REG;
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tmpdp->d_namlen = strlen(tmpdp->d_name);
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tmpdp->d_reclen = DIRECTSIZ(tmpdp->d_namlen);
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/* Make sure we have enough space for this entry */
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if (tmpdp->d_reclen > count)
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break;
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/* Copy it to the given buffer */
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bcopy(tmpdp, dent, tmpdp->d_reclen);
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/* Decrement the count */
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count -= dent->d_reclen;
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copylen += dent->d_reclen;
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lastdp = dent;
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/* Increment the offset pointer */
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dent = (struct dirent *)((char *)dent + dent->d_reclen);
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dircount++;
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}
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/* Increment the inode number we are checking */
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inodenum++;
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}
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/* End */
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#ifdef DEBUG_IFS_READDIR
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printf("ifs_readdir: copied %d directories\n", dircount);
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#endif
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/*
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* Get the last dent updated, and make the record d_reclen last the whole
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* buffer.
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*/
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if (lastdp != NULL) {
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/* Update the length of the last entry */
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lastdp->d_reclen += count;
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}
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/* Copy the data out */
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#ifdef DEBUG_IFS_READDIR
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printf("ifs_readdir: copied %d bytes\n", copylen);
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#endif
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error = uiomove(dirbuf, copylen, ap->a_uio);
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/* Free memory we've used */
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FREE(dirbuf, M_TEMP);
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FREE(tmpdp, M_TEMP);
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/* Set uio_offset to the last inode number */
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ap->a_uio->uio_offset = inodenum;
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/* Handle EOF/eofflag */
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if ((inodenum >= maxnuminode) && (ap->a_eofflag != NULL)) {
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*ap->a_eofflag = 1;
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#ifdef DEBUG_IFS_READDIR
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printf("ifs_readdir: setting EOF flag\n");
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#endif
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}
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#ifdef DEBUG_IFS_READDIR
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printf("ifs_readdir: new offset: %d\n", inodenum);
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#endif
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return error;
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}
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