/* * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed * to Berkeley by John Heidemann of the UCLA Ficus project. * * Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project * * 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. * * * $FreeBSD: src/sys/kern/vfs_default.c,v 1.28.2.7 2003/01/10 18:23:26 bde Exp $ * $DragonFly: src/sys/kern/vfs_default.c,v 1.28 2005/09/17 07:43:00 dillon Exp $ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int vop_nolookup (struct vop_old_lookup_args *); static int vop_nostrategy (struct vop_strategy_args *); /* * This vnode table stores what we want to do if the filesystem doesn't * implement a particular VOP. * * If there is no specific entry here, we will return EOPNOTSUPP. */ struct vop_ops *default_vnode_vops; static struct vnodeopv_entry_desc default_vnodeop_entries[] = { { &vop_default_desc, vop_eopnotsupp }, { &vop_advlock_desc, vop_einval }, { &vop_bwrite_desc, (void *) vop_stdbwrite }, { &vop_close_desc, vop_null }, { &vop_createvobject_desc, (void *) vop_stdcreatevobject }, { &vop_destroyvobject_desc, (void *) vop_stddestroyvobject }, { &vop_fsync_desc, vop_null }, { &vop_getvobject_desc, (void *) vop_stdgetvobject }, { &vop_ioctl_desc, vop_enotty }, { &vop_islocked_desc, (void *) vop_stdislocked }, { &vop_lease_desc, vop_null }, { &vop_lock_desc, (void *) vop_stdlock }, { &vop_mmap_desc, vop_einval }, { &vop_old_lookup_desc, (void *) vop_nolookup }, { &vop_open_desc, vop_null }, { &vop_pathconf_desc, vop_einval }, { &vop_poll_desc, (void *) vop_nopoll }, { &vop_readlink_desc, vop_einval }, { &vop_reallocblks_desc, vop_eopnotsupp }, { &vop_revoke_desc, (void *) vop_stdrevoke }, { &vop_strategy_desc, (void *) vop_nostrategy }, { &vop_unlock_desc, (void *) vop_stdunlock }, { &vop_getacl_desc, vop_eopnotsupp }, { &vop_setacl_desc, vop_eopnotsupp }, { &vop_aclcheck_desc, vop_eopnotsupp }, { &vop_getextattr_desc, vop_eopnotsupp }, { &vop_setextattr_desc, vop_eopnotsupp }, { &vop_nresolve_desc, (void *) vop_compat_nresolve }, { &vop_nlookupdotdot_desc, (void *) vop_compat_nlookupdotdot }, { &vop_ncreate_desc, (void *) vop_compat_ncreate }, { &vop_nmkdir_desc, (void *) vop_compat_nmkdir }, { &vop_nmknod_desc, (void *) vop_compat_nmknod }, { &vop_nlink_desc, (void *) vop_compat_nlink }, { &vop_nsymlink_desc, (void *) vop_compat_nsymlink }, { &vop_nwhiteout_desc, (void *) vop_compat_nwhiteout }, { &vop_nremove_desc, (void *) vop_compat_nremove }, { &vop_nrmdir_desc, (void *) vop_compat_nrmdir }, { &vop_nrename_desc, (void *) vop_compat_nrename }, { &vop_mountctl_desc, (void *) journal_mountctl }, { NULL, NULL } }; static struct vnodeopv_desc default_vnodeop_opv_desc = { &default_vnode_vops, default_vnodeop_entries, 0 }; VNODEOP_SET(default_vnodeop_opv_desc); int vop_eopnotsupp(struct vop_generic_args *ap) { return (EOPNOTSUPP); } int vop_ebadf(struct vop_generic_args *ap) { return (EBADF); } int vop_enotty(struct vop_generic_args *ap) { return (ENOTTY); } int vop_einval(struct vop_generic_args *ap) { return (EINVAL); } int vop_null(struct vop_generic_args *ap) { return (0); } int vop_defaultop(struct vop_generic_args *ap) { return (VOCALL(default_vnode_vops, ap)); } int vop_panic(struct vop_generic_args *ap) { panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name); } /* * vop_compat_resolve { struct namecache *a_ncp } XXX STOPGAP FUNCTION * * XXX OLD API ROUTINE! WHEN ALL VFSs HAVE BEEN CLEANED UP THIS PROCEDURE * WILL BE REMOVED. This procedure exists for all VFSs which have not * yet implemented VOP_NRESOLVE(). It converts VOP_NRESOLVE() into a * vop_old_lookup() and does appropriate translations. * * Resolve a ncp for VFSs which do not support the VOP. Eventually all * VFSs will support this VOP and this routine can be removed, since * VOP_NRESOLVE() is far less complex then the older LOOKUP/CACHEDLOOKUP * API. * * A locked ncp is passed in to be resolved. The NCP is resolved by * figuring out the vnode (if any) and calling cache_setvp() to attach the * vnode to the entry. If the entry represents a non-existant node then * cache_setvp() is called with a NULL vnode to resolve the entry into a * negative cache entry. No vnode locks are retained and the * ncp is left locked on return. * * The ncp will NEVER represent "", "." or "..", or contain any slashes. * * There is a potential directory and vnode interlock. The lock order * requirement is: namecache, governing directory, resolved vnode. */ int vop_compat_nresolve(struct vop_nresolve_args *ap) { int error; struct vnode *dvp; struct vnode *vp; struct namecache *ncp; struct componentname cnp; ncp = ap->a_ncp; /* locked namecache node */ if (ncp->nc_flag & NCF_MOUNTPT) /* can't cross a mount point! */ return(EPERM); if (ncp->nc_parent == NULL) return(EPERM); if ((dvp = ncp->nc_parent->nc_vp) == NULL) return(EPERM); /* * UFS currently stores all sorts of side effects, including a loop * variable, in the directory inode. That needs to be fixed and the * other VFS's audited before we can switch to LK_SHARED. */ if ((error = vget(dvp, LK_EXCLUSIVE, curthread)) != 0) { printf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n", ncp, ncp->nc_name); return(EAGAIN); } bzero(&cnp, sizeof(cnp)); cnp.cn_nameiop = NAMEI_LOOKUP; cnp.cn_flags = 0; cnp.cn_nameptr = ncp->nc_name; cnp.cn_namelen = ncp->nc_nlen; cnp.cn_cred = ap->a_cred; cnp.cn_td = curthread; /* XXX */ /* * vop_old_lookup() always returns vp locked. dvp may or may not be * left locked depending on CNP_PDIRUNLOCK. */ error = vop_old_lookup(ap->a_head.a_ops, dvp, &vp, &cnp); if (error == 0) VOP_UNLOCK(vp, 0, curthread); if ((cnp.cn_flags & CNP_PDIRUNLOCK) == 0) VOP_UNLOCK(dvp, 0, curthread); if ((ncp->nc_flag & NCF_UNRESOLVED) == 0) { /* was resolved by another process while we were unlocked */ if (error == 0) vrele(vp); } else if (error == 0) { KKASSERT(vp != NULL); cache_setvp(ncp, vp); vrele(vp); } else if (error == ENOENT) { KKASSERT(vp == NULL); if (cnp.cn_flags & CNP_ISWHITEOUT) ncp->nc_flag |= NCF_WHITEOUT; cache_setvp(ncp, NULL); } vrele(dvp); return (error); } /* * vop_compat_nlookupdotdot { struct vnode *a_dvp, * struct vnode **a_vpp, * struct ucred *a_cred } * * Lookup the vnode representing the parent directory of the specified * directory vnode. a_dvp should not be locked. If no error occurs *a_vpp * will contained the parent vnode, locked and refd, else *a_vpp will be NULL. * * This function is designed to aid NFS server-side operations and is * used by cache_fromdvp() to create a consistent, connected namecache * topology. * * As part of the NEW API work, VFSs will first split their CNP_ISDOTDOT * code out from their *_lookup() and create *_nlookupdotdot(). Then as time * permits VFSs will implement the remaining *_n*() calls and finally get * rid of their *_lookup() call. */ int vop_compat_nlookupdotdot(struct vop_nlookupdotdot_args *ap) { struct componentname cnp; int error; /* * UFS currently stores all sorts of side effects, including a loop * variable, in the directory inode. That needs to be fixed and the * other VFS's audited before we can switch to LK_SHARED. */ *ap->a_vpp = NULL; if ((error = vget(ap->a_dvp, LK_EXCLUSIVE, curthread)) != 0) return (error); if (ap->a_dvp->v_type != VDIR) { vput(ap->a_dvp); return (ENOTDIR); } bzero(&cnp, sizeof(cnp)); cnp.cn_nameiop = NAMEI_LOOKUP; cnp.cn_flags = CNP_ISDOTDOT; cnp.cn_nameptr = ".."; cnp.cn_namelen = 2; cnp.cn_cred = ap->a_cred; cnp.cn_td = curthread; /* XXX */ /* * vop_old_lookup() always returns vp locked. dvp may or may not be * left locked depending on CNP_PDIRUNLOCK. */ error = vop_old_lookup(ap->a_head.a_ops, ap->a_dvp, ap->a_vpp, &cnp); if (error == 0) VOP_UNLOCK(*ap->a_vpp, 0, curthread); if (cnp.cn_flags & CNP_PDIRUNLOCK) vrele(ap->a_dvp); else vput(ap->a_dvp); return (error); } /* * vop_compat_ncreate { struct namecache *a_ncp, XXX STOPGAP FUNCTION * struct vnode *a_vpp, * struct ucred *a_cred, * struct vattr *a_vap } * * Create a file as specified by a_vap. Compatibility requires us to issue * the appropriate VOP_OLD_LOOKUP before we issue VOP_OLD_CREATE in order * to setup the directory inode's i_offset and i_count (e.g. in UFS). */ int vop_compat_ncreate(struct vop_ncreate_args *ap) { struct thread *td = curthread; struct componentname cnp; struct namecache *ncp; struct vnode *dvp; int error; /* * Sanity checks, get a locked directory vnode. */ ncp = ap->a_ncp; /* locked namecache node */ if (ncp->nc_flag & NCF_MOUNTPT) /* can't cross a mount point! */ return(EPERM); if (ncp->nc_parent == NULL) return(EPERM); if ((dvp = ncp->nc_parent->nc_vp) == NULL) return(EPERM); if ((error = vget(dvp, LK_EXCLUSIVE, td)) != 0) { printf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n", ncp, ncp->nc_name); return(EAGAIN); } /* * Setup the cnp for a traditional vop_old_lookup() call. The lookup * caches all information required to create the entry in the * directory inode. We expect a return code of EJUSTRETURN for * the CREATE case. The cnp must simulated a saved-name situation. */ bzero(&cnp, sizeof(cnp)); cnp.cn_nameiop = NAMEI_CREATE; cnp.cn_flags = CNP_LOCKPARENT; cnp.cn_nameptr = ncp->nc_name; cnp.cn_namelen = ncp->nc_nlen; cnp.cn_cred = ap->a_cred; cnp.cn_td = td; *ap->a_vpp = NULL; error = vop_old_lookup(ap->a_head.a_ops, dvp, ap->a_vpp, &cnp); /* * EJUSTRETURN should be returned for this case, which means that * the VFS has setup the directory inode for the create. The dvp we * passed in is expected to remain in a locked state. * * If the VOP_OLD_CREATE is successful we are responsible for updating * the cache state of the locked ncp that was passed to us. */ if (error == EJUSTRETURN) { KKASSERT((cnp.cn_flags & CNP_PDIRUNLOCK) == 0); VOP_LEASE(dvp, td, ap->a_cred, LEASE_WRITE); error = VOP_OLD_CREATE(dvp, ap->a_vpp, &cnp, ap->a_vap); if (error == 0) { cache_setunresolved(ncp); cache_setvp(ncp, *ap->a_vpp); } } else { if (error == 0) { vput(*ap->a_vpp); *ap->a_vpp = NULL; error = EEXIST; } KKASSERT(*ap->a_vpp == NULL); } if ((cnp.cn_flags & CNP_PDIRUNLOCK) == 0) VOP_UNLOCK(dvp, 0, td); vrele(dvp); return (error); } /* * vop_compat_nmkdir { struct namecache *a_ncp, XXX STOPGAP FUNCTION * struct vnode *a_vpp, * struct ucred *a_cred, * struct vattr *a_vap } * * Create a directory as specified by a_vap. Compatibility requires us to * issue the appropriate VOP_OLD_LOOKUP before we issue VOP_OLD_MKDIR in * order to setup the directory inode's i_offset and i_count (e.g. in UFS). */ int vop_compat_nmkdir(struct vop_nmkdir_args *ap) { struct thread *td = curthread; struct componentname cnp; struct namecache *ncp; struct vnode *dvp; int error; /* * Sanity checks, get a locked directory vnode. */ ncp = ap->a_ncp; /* locked namecache node */ if (ncp->nc_flag & NCF_MOUNTPT) /* can't cross a mount point! */ return(EPERM); if (ncp->nc_parent == NULL) return(EPERM); if ((dvp = ncp->nc_parent->nc_vp) == NULL) return(EPERM); if ((error = vget(dvp, LK_EXCLUSIVE, td)) != 0) { printf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n", ncp, ncp->nc_name); return(EAGAIN); } /* * Setup the cnp for a traditional vop_old_lookup() call. The lookup * caches all information required to create the entry in the * directory inode. We expect a return code of EJUSTRETURN for * the CREATE case. The cnp must simulated a saved-name situation. */ bzero(&cnp, sizeof(cnp)); cnp.cn_nameiop = NAMEI_CREATE; cnp.cn_flags = CNP_LOCKPARENT; cnp.cn_nameptr = ncp->nc_name; cnp.cn_namelen = ncp->nc_nlen; cnp.cn_cred = ap->a_cred; cnp.cn_td = td; *ap->a_vpp = NULL; error = vop_old_lookup(ap->a_head.a_ops, dvp, ap->a_vpp, &cnp); /* * EJUSTRETURN should be returned for this case, which means that * the VFS has setup the directory inode for the create. The dvp we * passed in is expected to remain in a locked state. * * If the VOP_OLD_MKDIR is successful we are responsible for updating * the cache state of the locked ncp that was passed to us. */ if (error == EJUSTRETURN) { KKASSERT((cnp.cn_flags & CNP_PDIRUNLOCK) == 0); VOP_LEASE(dvp, td, ap->a_cred, LEASE_WRITE); error = VOP_OLD_MKDIR(dvp, ap->a_vpp, &cnp, ap->a_vap); if (error == 0) { cache_setunresolved(ncp); cache_setvp(ncp, *ap->a_vpp); } } else { if (error == 0) { vput(*ap->a_vpp); *ap->a_vpp = NULL; error = EEXIST; } KKASSERT(*ap->a_vpp == NULL); } if ((cnp.cn_flags & CNP_PDIRUNLOCK) == 0) VOP_UNLOCK(dvp, 0, td); vrele(dvp); return (error); } /* * vop_compat_nmknod { struct namecache *a_ncp, XXX STOPGAP FUNCTION * struct vnode *a_vpp, * struct ucred *a_cred, * struct vattr *a_vap } * * Create a device or fifo node as specified by a_vap. Compatibility requires * us to issue the appropriate VOP_OLD_LOOKUP before we issue VOP_OLD_MKNOD * in order to setup the directory inode's i_offset and i_count (e.g. in UFS). */ int vop_compat_nmknod(struct vop_nmknod_args *ap) { struct thread *td = curthread; struct componentname cnp; struct namecache *ncp; struct vnode *dvp; int error; /* * Sanity checks, get a locked directory vnode. */ ncp = ap->a_ncp; /* locked namecache node */ if (ncp->nc_flag & NCF_MOUNTPT) /* can't cross a mount point! */ return(EPERM); if (ncp->nc_parent == NULL) return(EPERM); if ((dvp = ncp->nc_parent->nc_vp) == NULL) return(EPERM); if ((error = vget(dvp, LK_EXCLUSIVE, td)) != 0) { printf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n", ncp, ncp->nc_name); return(EAGAIN); } /* * Setup the cnp for a traditional vop_old_lookup() call. The lookup * caches all information required to create the entry in the * directory inode. We expect a return code of EJUSTRETURN for * the CREATE case. The cnp must simulated a saved-name situation. */ bzero(&cnp, sizeof(cnp)); cnp.cn_nameiop = NAMEI_CREATE; cnp.cn_flags = CNP_LOCKPARENT; cnp.cn_nameptr = ncp->nc_name; cnp.cn_namelen = ncp->nc_nlen; cnp.cn_cred = ap->a_cred; cnp.cn_td = td; *ap->a_vpp = NULL; error = vop_old_lookup(ap->a_head.a_ops, dvp, ap->a_vpp, &cnp); /* * EJUSTRETURN should be returned for this case, which means that * the VFS has setup the directory inode for the create. The dvp we * passed in is expected to remain in a locked state. * * If the VOP_OLD_MKNOD is successful we are responsible for updating * the cache state of the locked ncp that was passed to us. */ if (error == EJUSTRETURN) { KKASSERT((cnp.cn_flags & CNP_PDIRUNLOCK) == 0); VOP_LEASE(dvp, td, ap->a_cred, LEASE_WRITE); error = VOP_OLD_MKNOD(dvp, ap->a_vpp, &cnp, ap->a_vap); if (error == 0) { cache_setunresolved(ncp); cache_setvp(ncp, *ap->a_vpp); } } else { if (error == 0) { vput(*ap->a_vpp); *ap->a_vpp = NULL; error = EEXIST; } KKASSERT(*ap->a_vpp == NULL); } if ((cnp.cn_flags & CNP_PDIRUNLOCK) == 0) VOP_UNLOCK(dvp, 0, td); vrele(dvp); return (error); } /* * vop_compat_nlink { struct namecache *a_ncp, XXX STOPGAP FUNCTION * struct vnode *a_vp, * struct ucred *a_cred } * * The passed vp is locked and represents the source. The passed ncp is * locked and represents the target to create. */ int vop_compat_nlink(struct vop_nlink_args *ap) { struct thread *td = curthread; struct componentname cnp; struct namecache *ncp; struct vnode *dvp; struct vnode *tvp; int error; /* * Sanity checks, get a locked directory vnode. */ ncp = ap->a_ncp; /* locked namecache node */ if (ncp->nc_flag & NCF_MOUNTPT) /* can't cross a mount point! */ return(EPERM); if (ncp->nc_parent == NULL) return(EPERM); if ((dvp = ncp->nc_parent->nc_vp) == NULL) return(EPERM); if ((error = vget(dvp, LK_EXCLUSIVE, td)) != 0) { printf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n", ncp, ncp->nc_name); return(EAGAIN); } /* * Setup the cnp for a traditional vop_old_lookup() call. The lookup * caches all information required to create the entry in the * directory inode. We expect a return code of EJUSTRETURN for * the CREATE case. The cnp must simulated a saved-name situation. */ bzero(&cnp, sizeof(cnp)); cnp.cn_nameiop = NAMEI_CREATE; cnp.cn_flags = CNP_LOCKPARENT; cnp.cn_nameptr = ncp->nc_name; cnp.cn_namelen = ncp->nc_nlen; cnp.cn_cred = ap->a_cred; cnp.cn_td = td; tvp = NULL; error = vop_old_lookup(ap->a_head.a_ops, dvp, &tvp, &cnp); /* * EJUSTRETURN should be returned for this case, which means that * the VFS has setup the directory inode for the create. The dvp we * passed in is expected to remain in a locked state. * * If the VOP_OLD_LINK is successful we are responsible for updating * the cache state of the locked ncp that was passed to us. */ if (error == EJUSTRETURN) { KKASSERT((cnp.cn_flags & CNP_PDIRUNLOCK) == 0); VOP_LEASE(dvp, td, ap->a_cred, LEASE_WRITE); VOP_LEASE(ap->a_vp, td, ap->a_cred, LEASE_WRITE); error = VOP_OLD_LINK(dvp, ap->a_vp, &cnp); if (error == 0) { cache_setunresolved(ncp); cache_setvp(ncp, ap->a_vp); } } else { if (error == 0) { vput(tvp); error = EEXIST; } } if ((cnp.cn_flags & CNP_PDIRUNLOCK) == 0) VOP_UNLOCK(dvp, 0, td); vrele(dvp); return (error); } int vop_compat_nsymlink(struct vop_nsymlink_args *ap) { struct thread *td = curthread; struct componentname cnp; struct namecache *ncp; struct vnode *dvp; struct vnode *vp; int error; /* * Sanity checks, get a locked directory vnode. */ *ap->a_vpp = NULL; ncp = ap->a_ncp; /* locked namecache node */ if (ncp->nc_flag & NCF_MOUNTPT) /* can't cross a mount point! */ return(EPERM); if (ncp->nc_parent == NULL) return(EPERM); if ((dvp = ncp->nc_parent->nc_vp) == NULL) return(EPERM); if ((error = vget(dvp, LK_EXCLUSIVE, td)) != 0) { printf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n", ncp, ncp->nc_name); return(EAGAIN); } /* * Setup the cnp for a traditional vop_old_lookup() call. The lookup * caches all information required to create the entry in the * directory inode. We expect a return code of EJUSTRETURN for * the CREATE case. The cnp must simulated a saved-name situation. */ bzero(&cnp, sizeof(cnp)); cnp.cn_nameiop = NAMEI_CREATE; cnp.cn_flags = CNP_LOCKPARENT; cnp.cn_nameptr = ncp->nc_name; cnp.cn_namelen = ncp->nc_nlen; cnp.cn_cred = ap->a_cred; cnp.cn_td = td; vp = NULL; error = vop_old_lookup(ap->a_head.a_ops, dvp, &vp, &cnp); /* * EJUSTRETURN should be returned for this case, which means that * the VFS has setup the directory inode for the create. The dvp we * passed in is expected to remain in a locked state. * * If the VOP_OLD_SYMLINK is successful we are responsible for updating * the cache state of the locked ncp that was passed to us. */ if (error == EJUSTRETURN) { KKASSERT((cnp.cn_flags & CNP_PDIRUNLOCK) == 0); VOP_LEASE(dvp, td, ap->a_cred, LEASE_WRITE); error = VOP_OLD_SYMLINK(dvp, &vp, &cnp, ap->a_vap, ap->a_target); if (error == 0) { cache_setunresolved(ncp); cache_setvp(ncp, vp); *ap->a_vpp = vp; } } else { if (error == 0) { vput(vp); vp = NULL; error = EEXIST; } KKASSERT(vp == NULL); } if ((cnp.cn_flags & CNP_PDIRUNLOCK) == 0) VOP_UNLOCK(dvp, 0, td); vrele(dvp); return (error); } /* * vop_compat_nwhiteout { struct namecache *a_ncp, XXX STOPGAP FUNCTION * struct ucred *a_cred, * int a_flags } * * Issie a whiteout operation (create, lookup, or delete). Compatibility * requires us to issue the appropriate VOP_OLD_LOOKUP before we issue * VOP_OLD_WHITEOUT in order to setup the directory inode's i_offset and i_count * (e.g. in UFS) for the NAMEI_CREATE and NAMEI_DELETE ops. For NAMEI_LOOKUP * no lookup is necessary. */ int vop_compat_nwhiteout(struct vop_nwhiteout_args *ap) { struct thread *td = curthread; struct componentname cnp; struct namecache *ncp; struct vnode *dvp; struct vnode *vp; int error; /* * Sanity checks, get a locked directory vnode. */ ncp = ap->a_ncp; /* locked namecache node */ if (ncp->nc_flag & NCF_MOUNTPT) /* can't cross a mount point! */ return(EPERM); if (ncp->nc_parent == NULL) return(EPERM); if ((dvp = ncp->nc_parent->nc_vp) == NULL) return(EPERM); if ((error = vget(dvp, LK_EXCLUSIVE, td)) != 0) { printf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n", ncp, ncp->nc_name); return(EAGAIN); } /* * Setup the cnp for a traditional vop_old_lookup() call. The lookup * caches all information required to create the entry in the * directory inode. We expect a return code of EJUSTRETURN for * the CREATE case. The cnp must simulated a saved-name situation. */ bzero(&cnp, sizeof(cnp)); cnp.cn_nameiop = ap->a_flags; cnp.cn_flags = CNP_LOCKPARENT; cnp.cn_nameptr = ncp->nc_name; cnp.cn_namelen = ncp->nc_nlen; cnp.cn_cred = ap->a_cred; cnp.cn_td = td; vp = NULL; /* * EJUSTRETURN should be returned for the CREATE or DELETE cases. * The VFS has setup the directory inode for the create. The dvp we * passed in is expected to remain in a locked state. * * If the VOP_OLD_WHITEOUT is successful we are responsible for updating * the cache state of the locked ncp that was passed to us. */ switch(ap->a_flags) { case NAMEI_DELETE: cnp.cn_flags |= CNP_DOWHITEOUT; /* fall through */ case NAMEI_CREATE: error = vop_old_lookup(ap->a_head.a_ops, dvp, &vp, &cnp); if (error == EJUSTRETURN) { KKASSERT((cnp.cn_flags & CNP_PDIRUNLOCK) == 0); VOP_LEASE(dvp, td, ap->a_cred, LEASE_WRITE); error = VOP_OLD_WHITEOUT(dvp, &cnp, ap->a_flags); if (error == 0) cache_setunresolved(ncp); } else { if (error == 0) { vput(vp); vp = NULL; error = EEXIST; } KKASSERT(vp == NULL); } break; case NAMEI_LOOKUP: error = VOP_OLD_WHITEOUT(dvp, NULL, ap->a_flags); break; default: error = EINVAL; break; } if ((cnp.cn_flags & CNP_PDIRUNLOCK) == 0) VOP_UNLOCK(dvp, 0, td); vrele(dvp); return (error); } /* * vop_compat_nremove { struct namecache *a_ncp, XXX STOPGAP FUNCTION * struct ucred *a_cred } */ int vop_compat_nremove(struct vop_nremove_args *ap) { struct thread *td = curthread; struct componentname cnp; struct namecache *ncp; struct vnode *dvp; struct vnode *vp; int error; /* * Sanity checks, get a locked directory vnode. */ ncp = ap->a_ncp; /* locked namecache node */ if (ncp->nc_flag & NCF_MOUNTPT) /* can't cross a mount point! */ return(EPERM); if (ncp->nc_parent == NULL) return(EPERM); if ((dvp = ncp->nc_parent->nc_vp) == NULL) return(EPERM); if ((error = vget(dvp, LK_EXCLUSIVE, td)) != 0) { printf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n", ncp, ncp->nc_name); return(EAGAIN); } /* * Setup the cnp for a traditional vop_old_lookup() call. The lookup * caches all information required to delete the entry in the * directory inode. We expect a return code of 0 for the DELETE * case (meaning that a vp has been found). The cnp must simulated * a saved-name situation. */ bzero(&cnp, sizeof(cnp)); cnp.cn_nameiop = NAMEI_DELETE; cnp.cn_flags = CNP_LOCKPARENT; cnp.cn_nameptr = ncp->nc_name; cnp.cn_namelen = ncp->nc_nlen; cnp.cn_cred = ap->a_cred; cnp.cn_td = td; /* * The vnode must be a directory and must not represent the * current directory. */ vp = NULL; error = vop_old_lookup(ap->a_head.a_ops, dvp, &vp, &cnp); if (error == 0 && vp->v_type == VDIR) error = EPERM; if (error == 0) { KKASSERT((cnp.cn_flags & CNP_PDIRUNLOCK) == 0); VOP_LEASE(dvp, td, ap->a_cred, LEASE_WRITE); VOP_LEASE(vp, td, ap->a_cred, LEASE_WRITE); error = VOP_OLD_REMOVE(dvp, vp, &cnp); if (error == 0) { cache_setunresolved(ncp); cache_setvp(ncp, NULL); } } if (vp) { if (dvp == vp) vrele(vp); else vput(vp); } if ((cnp.cn_flags & CNP_PDIRUNLOCK) == 0) VOP_UNLOCK(dvp, 0, td); vrele(dvp); return (error); } /* * vop_compat_nrmdir { struct namecache *a_ncp, XXX STOPGAP FUNCTION * struct ucred *a_cred } */ int vop_compat_nrmdir(struct vop_nrmdir_args *ap) { struct thread *td = curthread; struct componentname cnp; struct namecache *ncp; struct vnode *dvp; struct vnode *vp; int error; /* * Sanity checks, get a locked directory vnode. */ ncp = ap->a_ncp; /* locked namecache node */ if (ncp->nc_flag & NCF_MOUNTPT) /* can't cross a mount point! */ return(EPERM); if (ncp->nc_parent == NULL) return(EPERM); if ((dvp = ncp->nc_parent->nc_vp) == NULL) return(EPERM); if ((error = vget(dvp, LK_EXCLUSIVE, td)) != 0) { printf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n", ncp, ncp->nc_name); return(EAGAIN); } /* * Setup the cnp for a traditional vop_old_lookup() call. The lookup * caches all information required to delete the entry in the * directory inode. We expect a return code of 0 for the DELETE * case (meaning that a vp has been found). The cnp must simulated * a saved-name situation. */ bzero(&cnp, sizeof(cnp)); cnp.cn_nameiop = NAMEI_DELETE; cnp.cn_flags = CNP_LOCKPARENT; cnp.cn_nameptr = ncp->nc_name; cnp.cn_namelen = ncp->nc_nlen; cnp.cn_cred = ap->a_cred; cnp.cn_td = td; /* * The vnode must be a directory and must not represent the * current directory. */ vp = NULL; error = vop_old_lookup(ap->a_head.a_ops, dvp, &vp, &cnp); if (error == 0 && vp->v_type != VDIR) error = ENOTDIR; if (error == 0 && vp == dvp) error = EINVAL; if (error == 0 && (vp->v_flag & VROOT)) error = EBUSY; if (error == 0) { KKASSERT((cnp.cn_flags & CNP_PDIRUNLOCK) == 0); VOP_LEASE(dvp, td, ap->a_cred, LEASE_WRITE); VOP_LEASE(vp, td, ap->a_cred, LEASE_WRITE); error = VOP_OLD_RMDIR(dvp, vp, &cnp); /* * Note that this invalidation will cause any process * currently CD'd into the directory being removed to be * disconnected from the topology and not be able to ".." * back out. */ if (error == 0) cache_inval(ncp, CINV_DESTROY); } if (vp) { if (dvp == vp) vrele(vp); else vput(vp); } if ((cnp.cn_flags & CNP_PDIRUNLOCK) == 0) VOP_UNLOCK(dvp, 0, td); vrele(dvp); return (error); } /* * vop_compat_nrename { struct namecache *a_fncp, XXX STOPGAP FUNCTION * struct namecache *a_tncp, * struct ucred *a_cred } * * This is a fairly difficult procedure. The old VOP_OLD_RENAME requires that * the source directory and vnode be unlocked and the target directory and * vnode (if it exists) be locked. All arguments will be vrele'd and * the targets will also be unlocked regardless of the return code. */ int vop_compat_nrename(struct vop_nrename_args *ap) { struct thread *td = curthread; struct componentname fcnp; struct componentname tcnp; struct namecache *fncp; struct namecache *tncp; struct vnode *fdvp, *fvp; struct vnode *tdvp, *tvp; int error; /* * Sanity checks, get referenced vnodes representing the source. */ fncp = ap->a_fncp; /* locked namecache node */ if (fncp->nc_flag & NCF_MOUNTPT) /* can't cross a mount point! */ return(EPERM); if (fncp->nc_parent == NULL) return(EPERM); if ((fdvp = fncp->nc_parent->nc_vp) == NULL) return(EPERM); /* * Temporarily lock the source directory and lookup in DELETE mode to * check permissions. XXX delete permissions should have been * checked by nlookup(), we need to add NLC_DELETE for delete * checking. It is unclear whether VFS's require the directory setup * info NAMEI_DELETE causes to be stored in the fdvp's inode, but * since it isn't locked and since UFS always does a relookup of * the source, it is believed that the only side effect that matters * is the permissions check. */ if ((error = vget(fdvp, LK_EXCLUSIVE, td)) != 0) { printf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n", fncp, fncp->nc_name); return(EAGAIN); } bzero(&fcnp, sizeof(fcnp)); fcnp.cn_nameiop = NAMEI_DELETE; fcnp.cn_flags = CNP_LOCKPARENT; fcnp.cn_nameptr = fncp->nc_name; fcnp.cn_namelen = fncp->nc_nlen; fcnp.cn_cred = ap->a_cred; fcnp.cn_td = td; /* * note: vop_old_lookup (i.e. VOP_OLD_LOOKUP) always returns a locked * fvp. */ fvp = NULL; error = vop_old_lookup(ap->a_head.a_ops, fdvp, &fvp, &fcnp); if (error == 0 && (fvp->v_flag & VROOT)) { vput(fvp); /* as if vop_old_lookup had failed */ error = EBUSY; } if ((fcnp.cn_flags & CNP_PDIRUNLOCK) == 0) { fcnp.cn_flags |= CNP_PDIRUNLOCK; VOP_UNLOCK(fdvp, 0, td); } if (error) { vrele(fdvp); return (error); } VOP_UNLOCK(fvp, 0, td); /* * fdvp and fvp are now referenced and unlocked. * * Get a locked directory vnode for the target and lookup the target * in CREATE mode so it places the required information in the * directory inode. */ tncp = ap->a_tncp; /* locked namecache node */ if (tncp->nc_flag & NCF_MOUNTPT) /* can't cross a mount point! */ error = EPERM; if (tncp->nc_parent == NULL) error = EPERM; if ((tdvp = tncp->nc_parent->nc_vp) == NULL) error = EPERM; if (error) { vrele(fdvp); vrele(fvp); return (error); } if ((error = vget(tdvp, LK_EXCLUSIVE, td)) != 0) { printf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n", tncp, tncp->nc_name); vrele(fdvp); vrele(fvp); return(EAGAIN); } /* * Setup the cnp for a traditional vop_old_lookup() call. The lookup * caches all information required to create the entry in the * target directory inode. */ bzero(&tcnp, sizeof(tcnp)); tcnp.cn_nameiop = NAMEI_RENAME; tcnp.cn_flags = CNP_LOCKPARENT; tcnp.cn_nameptr = tncp->nc_name; tcnp.cn_namelen = tncp->nc_nlen; tcnp.cn_cred = ap->a_cred; tcnp.cn_td = td; tvp = NULL; error = vop_old_lookup(ap->a_head.a_ops, tdvp, &tvp, &tcnp); if (error == EJUSTRETURN) { /* * Target does not exist. tvp should be NULL. */ KKASSERT(tvp == NULL); KKASSERT((tcnp.cn_flags & CNP_PDIRUNLOCK) == 0); error = VOP_OLD_RENAME(fdvp, fvp, &fcnp, tdvp, tvp, &tcnp); if (error == 0) { cache_rename(fncp, tncp); cache_setvp(tncp, fvp); } } else if (error == 0) { /* * Target exists. VOP_OLD_RENAME should correctly delete the * target. */ KKASSERT((tcnp.cn_flags & CNP_PDIRUNLOCK) == 0); error = VOP_OLD_RENAME(fdvp, fvp, &fcnp, tdvp, tvp, &tcnp); if (error == 0) { cache_rename(fncp, tncp); cache_setvp(tncp, fvp); } } else { vrele(fdvp); vrele(fvp); if (tcnp.cn_flags & CNP_PDIRUNLOCK) vrele(tdvp); else vput(tdvp); } return (error); } static int vop_nolookup(ap) struct vop_old_lookup_args /* { struct vnode *a_dvp; struct vnode **a_vpp; struct componentname *a_cnp; } */ *ap; { *ap->a_vpp = NULL; return (ENOTDIR); } /* * vop_nostrategy: * * Strategy routine for VFS devices that have none. * * B_ERROR and B_INVAL must be cleared prior to calling any strategy * routine. Typically this is done for a B_READ strategy call. Typically * B_INVAL is assumed to already be clear prior to a write and should not * be cleared manually unless you just made the buffer invalid. B_ERROR * should be cleared either way. */ static int vop_nostrategy (struct vop_strategy_args *ap) { printf("No strategy for buffer at %p\n", ap->a_bp); vprint("", ap->a_vp); vprint("", ap->a_bp->b_vp); ap->a_bp->b_flags |= B_ERROR; ap->a_bp->b_error = EOPNOTSUPP; biodone(ap->a_bp); return (EOPNOTSUPP); } int vop_stdpathconf(ap) struct vop_pathconf_args /* { struct vnode *a_vp; int a_name; int *a_retval; } */ *ap; { switch (ap->a_name) { case _PC_LINK_MAX: *ap->a_retval = LINK_MAX; return (0); case _PC_MAX_CANON: *ap->a_retval = MAX_CANON; return (0); case _PC_MAX_INPUT: *ap->a_retval = MAX_INPUT; return (0); case _PC_PIPE_BUF: *ap->a_retval = PIPE_BUF; return (0); case _PC_CHOWN_RESTRICTED: *ap->a_retval = 1; return (0); case _PC_VDISABLE: *ap->a_retval = _POSIX_VDISABLE; return (0); default: return (EINVAL); } /* NOTREACHED */ } /* * Standard lock. The lock is recursive-capable only if the lock was * initialized with LK_CANRECURSE or that flag is passed in a_flags. */ int vop_stdlock(ap) struct vop_lock_args /* { struct vnode *a_vp; int a_flags; struct proc *a_p; } */ *ap; { int error; #ifndef DEBUG_LOCKS error = lockmgr(&ap->a_vp->v_lock, ap->a_flags, NULL, ap->a_td); #else error = debuglockmgr(&ap->a_vp->v_lock, ap->a_flags, NULL, ap->a_td, "vop_stdlock", ap->a_vp->filename, ap->a_vp->line); #endif return(error); } int vop_stdunlock(ap) struct vop_unlock_args /* { struct vnode *a_vp; int a_flags; struct thread *a_td; } */ *ap; { int error; error = lockmgr(&ap->a_vp->v_lock, ap->a_flags | LK_RELEASE, NULL, ap->a_td); return(error); } int vop_stdislocked(ap) struct vop_islocked_args /* { struct vnode *a_vp; struct thread *a_td; } */ *ap; { return (lockstatus(&ap->a_vp->v_lock, ap->a_td)); } /* * Return true for select/poll. */ int vop_nopoll(ap) struct vop_poll_args /* { struct vnode *a_vp; int a_events; struct ucred *a_cred; struct proc *a_p; } */ *ap; { /* * Return true for read/write. If the user asked for something * special, return POLLNVAL, so that clients have a way of * determining reliably whether or not the extended * functionality is present without hard-coding knowledge * of specific filesystem implementations. */ if (ap->a_events & ~POLLSTANDARD) return (POLLNVAL); return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); } /* * Implement poll for local filesystems that support it. */ int vop_stdpoll(ap) struct vop_poll_args /* { struct vnode *a_vp; int a_events; struct ucred *a_cred; struct thread *a_td; } */ *ap; { if (ap->a_events & ~POLLSTANDARD) return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events)); return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); } int vop_stdbwrite(ap) struct vop_bwrite_args *ap; { return (bwrite(ap->a_bp)); } int vop_stdcreatevobject(ap) struct vop_createvobject_args /* { struct vnode *a_vp; struct proc *a_td; } */ *ap; { struct vnode *vp = ap->a_vp; struct thread *td = ap->a_td; struct vattr vat; vm_object_t object; int error = 0; if (!vn_isdisk(vp, NULL) && vn_canvmio(vp) == FALSE) return (0); retry: if ((object = vp->v_object) == NULL) { if (vp->v_type == VREG || vp->v_type == VDIR) { if ((error = VOP_GETATTR(vp, &vat, td)) != 0) goto retn; object = vnode_pager_alloc(vp, vat.va_size, 0, 0); } else if (vp->v_rdev && dev_is_good(vp->v_rdev)) { /* * XXX v_rdev uses NULL/non-NULL instead of NODEV * * This simply allocates the biggest object possible * for a disk vnode. This should be fixed, but doesn't * cause any problems (yet). */ object = vnode_pager_alloc(vp, IDX_TO_OFF(INT_MAX), 0, 0); } else { goto retn; } /* * Dereference the reference we just created. This assumes * that the object is associated with the vp. */ object->ref_count--; vp->v_usecount--; } else { if (object->flags & OBJ_DEAD) { VOP_UNLOCK(vp, 0, td); tsleep(object, 0, "vodead", 0); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); goto retry; } } KASSERT(vp->v_object != NULL, ("vfs_object_create: NULL object")); vp->v_flag |= VOBJBUF; retn: return (error); } int vop_stddestroyvobject(ap) struct vop_destroyvobject_args /* { struct vnode *vp; } */ *ap; { struct vnode *vp = ap->a_vp; vm_object_t obj = vp->v_object; if (vp->v_object == NULL) return (0); if (obj->ref_count == 0) { /* * vclean() may be called twice. The first time * removes the primary reference to the object, * the second time goes one further and is a * special-case to terminate the object. * * don't double-terminate the object. */ if ((obj->flags & OBJ_DEAD) == 0) vm_object_terminate(obj); } else { /* * Woe to the process that tries to page now :-). */ vm_pager_deallocate(obj); } return (0); } /* * Return the underlying VM object. This routine may be called with or * without the vnode interlock held. If called without, the returned * object is not guarenteed to be valid. The syncer typically gets the * object without holding the interlock in order to quickly test whether * it might be dirty before going heavy-weight. vm_object's use zalloc * and thus stable-storage, so this is safe. */ int vop_stdgetvobject(ap) struct vop_getvobject_args /* { struct vnode *vp; struct vm_object **objpp; } */ *ap; { struct vnode *vp = ap->a_vp; struct vm_object **objpp = ap->a_objpp; if (objpp) *objpp = vp->v_object; return (vp->v_object ? 0 : EINVAL); } /* * vfs default ops * used to fill the vfs fucntion table to get reasonable default return values. */ int vfs_stdmount(struct mount *mp, char *path, caddr_t data, struct thread *td) { return (0); } int vfs_stdunmount(struct mount *mp, int mntflags, struct thread *td) { return (0); } int vfs_stdroot(struct mount *mp, struct vnode **vpp) { return (EOPNOTSUPP); } int vfs_stdstatfs(struct mount *mp, struct statfs *sbp, struct thread *td) { return (EOPNOTSUPP); } int vfs_stdvptofh(struct vnode *vp, struct fid *fhp) { return (EOPNOTSUPP); } int vfs_stdstart(struct mount *mp, int flags, struct thread *td) { return (0); } int vfs_stdquotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg, struct thread *td) { return (EOPNOTSUPP); } int vfs_stdsync(struct mount *mp, int waitfor, struct thread *td) { return (0); } int vfs_stdnosync(struct mount *mp, int waitfor, struct thread *td) { return (EOPNOTSUPP); } int vfs_stdvget(struct mount *mp, ino_t ino, struct vnode **vpp) { return (EOPNOTSUPP); } int vfs_stdfhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) { return (EOPNOTSUPP); } int vfs_stdcheckexp(struct mount *mp, struct sockaddr *nam, int *extflagsp, struct ucred **credanonp) { return (EOPNOTSUPP); } int vfs_stdinit(struct vfsconf *vfsp) { return (0); } int vfs_stduninit(struct vfsconf *vfsp) { return(0); } int vfs_stdextattrctl(struct mount *mp, int cmd, const char *attrname, caddr_t arg, struct thread *td) { return(EOPNOTSUPP); } /* end of vfs default ops */