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6e64bc845f
osreldate.h and sys/param.h were manually adjusted to not __FreeBSD_version since it will be defined by the compiler.
315 lines
No EOL
11 KiB
C
Vendored
315 lines
No EOL
11 KiB
C
Vendored
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1985, 1989, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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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. 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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* @(#)namei.h 8.5 (Berkeley) 1/9/95
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*/
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#ifndef _SYS_NAMEI_H_
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#define _SYS_NAMEI_H_
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#include <sys/caprights.h>
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#include <sys/filedesc.h>
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#include <sys/queue.h>
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#include <sys/_seqc.h>
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#include <sys/_uio.h>
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enum nameiop { LOOKUP, CREATE, DELETE, RENAME };
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struct componentname {
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/*
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* Arguments to lookup.
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*/
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u_int64_t cn_flags; /* flags to namei */
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struct ucred *cn_cred; /* credentials */
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enum nameiop cn_nameiop; /* namei operation */
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int cn_lkflags; /* Lock flags LK_EXCLUSIVE or LK_SHARED */
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/*
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* Shared between lookup and commit routines.
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*/
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char *cn_pnbuf; /* pathname buffer */
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char *cn_nameptr; /* pointer to looked up name */
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long cn_namelen; /* length of looked up component */
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};
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struct nameicap_tracker;
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TAILQ_HEAD(nameicap_tracker_head, nameicap_tracker);
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/*
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* Encapsulation of namei parameters.
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*/
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struct nameidata {
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/*
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* Arguments to namei/lookup.
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*/
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const char *ni_dirp; /* pathname pointer */
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enum uio_seg ni_segflg; /* location of pathname */
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cap_rights_t *ni_rightsneeded; /* rights required to look up vnode */
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/*
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* Arguments to lookup.
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*/
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struct vnode *ni_startdir; /* starting directory */
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struct vnode *ni_rootdir; /* logical root directory */
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struct vnode *ni_topdir; /* logical top directory */
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int ni_dirfd; /* starting directory for *at functions */
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int ni_lcf; /* local call flags */
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/*
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* Results: returned from namei
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*/
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struct filecaps ni_filecaps; /* rights the *at base has */
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/*
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* Results: returned from/manipulated by lookup
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*/
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struct vnode *ni_vp; /* vnode of result */
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struct vnode *ni_dvp; /* vnode of intermediate directory */
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/*
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* Results: flags returned from namei
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*/
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u_int ni_resflags;
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/*
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* Debug for validating API use by the callers.
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*/
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u_short ni_debugflags;
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/*
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* Shared between namei and lookup/commit routines.
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*/
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u_short ni_loopcnt; /* count of symlinks encountered */
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size_t ni_pathlen; /* remaining chars in path */
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char *ni_next; /* next location in pathname */
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/*
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* Lookup parameters: this structure describes the subset of
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* information from the nameidata structure that is passed
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* through the VOP interface.
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*/
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struct componentname ni_cnd;
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struct nameicap_tracker_head ni_cap_tracker;
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/*
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* Private helper data for UFS, must be at the end. See
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* NDINIT_PREFILL().
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*/
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seqc_t ni_dvp_seqc;
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seqc_t ni_vp_seqc;
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};
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#ifdef _KERNEL
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enum cache_fpl_status { CACHE_FPL_STATUS_DESTROYED, CACHE_FPL_STATUS_ABORTED,
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CACHE_FPL_STATUS_PARTIAL, CACHE_FPL_STATUS_HANDLED, CACHE_FPL_STATUS_UNSET };
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int cache_fplookup(struct nameidata *ndp, enum cache_fpl_status *status,
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struct pwd **pwdp);
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/*
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* Flags for namei.
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*
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* If modifying the list make sure to check whether NDVALIDATE needs updating.
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*/
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/*
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* Debug.
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*/
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#define NAMEI_DBG_INITED 0x0001
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#define NAMEI_DBG_CALLED 0x0002
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#define NAMEI_DBG_HADSTARTDIR 0x0004
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/*
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* namei operational modifier flags, stored in ni_cnd.flags
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*/
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#define NC_NOMAKEENTRY 0x0001 /* name must not be added to cache */
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#define NC_KEEPPOSENTRY 0x0002 /* don't evict a positive entry */
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#define NOCACHE NC_NOMAKEENTRY /* for compatibility with older code */
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#define LOCKLEAF 0x0004 /* lock vnode on return */
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#define LOCKPARENT 0x0008 /* want parent vnode returned locked */
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#define WANTPARENT 0x0010 /* want parent vnode returned unlocked */
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#define FAILIFEXISTS 0x0020 /* return EEXIST if found */
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#define FOLLOW 0x0040 /* follow symbolic links */
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#define EMPTYPATH 0x0080 /* Allow empty path for *at */
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#define LOCKSHARED 0x0100 /* Shared lock leaf */
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#define NOFOLLOW 0x0000 /* do not follow symbolic links (pseudo) */
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#define RBENEATH 0x100000000ULL /* No escape, even tmp, from start dir */
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#define MODMASK 0xf000001ffULL /* mask of operational modifiers */
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/*
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* Namei parameter descriptors.
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*/
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#define RDONLY 0x00000200 /* lookup with read-only semantics */
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#define ISRESTARTED 0x00000400 /* restarted namei */
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/* UNUSED 0x00000800 */
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#define ISWHITEOUT 0x00001000 /* found whiteout */
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#define DOWHITEOUT 0x00002000 /* do whiteouts */
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#define WILLBEDIR 0x00004000 /* new files will be dirs; allow trailing / */
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#define ISOPEN 0x00008000 /* caller is opening; return a real vnode. */
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#define NOCROSSMOUNT 0x00010000 /* do not cross mount points */
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#define NOMACCHECK 0x00020000 /* do not perform MAC checks */
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#define AUDITVNODE1 0x00040000 /* audit the looked up vnode information */
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#define AUDITVNODE2 0x00080000 /* audit the looked up vnode information */
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#define NOCAPCHECK 0x00100000 /* do not perform capability checks */
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#define OPENREAD 0x00200000 /* open for reading */
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#define OPENWRITE 0x00400000 /* open for writing */
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#define WANTIOCTLCAPS 0x00800000 /* leave ioctl caps for the caller */
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/* UNUSED 0x01000000 */
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#define NOEXECCHECK 0x02000000 /* do not perform exec check on dir */
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#define MAKEENTRY 0x04000000 /* entry is to be added to name cache */
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#define ISSYMLINK 0x08000000 /* symlink needs interpretation */
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#define ISLASTCN 0x10000000 /* this is last component of pathname */
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#define ISDOTDOT 0x20000000 /* current component name is .. */
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#define TRAILINGSLASH 0x40000000 /* path ended in a slash */
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#define PARAMASK 0x7ffffe00 /* mask of parameter descriptors */
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/*
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* Flags which must not be passed in by callers.
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*/
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#define NAMEI_INTERNAL_FLAGS \
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(NOEXECCHECK | MAKEENTRY | ISSYMLINK | ISLASTCN | ISDOTDOT | \
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TRAILINGSLASH | ISRESTARTED)
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/*
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* Namei results flags
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*/
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#define NIRES_ABS 0x00000001 /* Path was absolute */
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#define NIRES_STRICTREL 0x00000002 /* Restricted lookup result */
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#define NIRES_EMPTYPATH 0x00000004 /* EMPTYPATH used */
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/*
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* Flags in ni_lcf, valid for the duration of the namei call.
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*/
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#define NI_LCF_STRICTREL 0x0001 /* relative lookup only */
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#define NI_LCF_CAP_DOTDOT 0x0002 /* ".." in strictrelative case */
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/* Track capability restrictions seperately for violation ktracing. */
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#define NI_LCF_STRICTREL_KTR 0x0004 /* trace relative lookups */
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#define NI_LCF_CAP_DOTDOT_KTR 0x0008 /* ".." in strictrelative case */
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#define NI_LCF_KTR_FLAGS (NI_LCF_STRICTREL_KTR | NI_LCF_CAP_DOTDOT_KTR)
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/*
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* Initialization of a nameidata structure.
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*/
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#define NDINIT(ndp, op, flags, segflg, namep) \
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NDINIT_ALL(ndp, op, flags, segflg, namep, AT_FDCWD, NULL, &cap_no_rights)
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#define NDINIT_AT(ndp, op, flags, segflg, namep, dirfd) \
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NDINIT_ALL(ndp, op, flags, segflg, namep, dirfd, NULL, &cap_no_rights)
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#define NDINIT_ATRIGHTS(ndp, op, flags, segflg, namep, dirfd, rightsp) \
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NDINIT_ALL(ndp, op, flags, segflg, namep, dirfd, NULL, rightsp)
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#define NDINIT_ATVP(ndp, op, flags, segflg, namep, vp) \
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NDINIT_ALL(ndp, op, flags, segflg, namep, AT_FDCWD, vp, &cap_no_rights)
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/*
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* Note the constant pattern may *hide* bugs.
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* Note also that we enable debug checks for non-TIED KLDs
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* so that they can run on an INVARIANTS kernel without tripping over
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* assertions on ni_debugflags state.
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*/
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#if defined(INVARIANTS) || (defined(KLD_MODULE) && !defined(KLD_TIED))
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#define NDINIT_PREFILL(arg) memset(arg, 0xff, offsetof(struct nameidata, \
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ni_dvp_seqc))
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#define NDINIT_DBG(arg) { (arg)->ni_debugflags = NAMEI_DBG_INITED; }
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#define NDREINIT_DBG(arg) { \
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if (((arg)->ni_debugflags & NAMEI_DBG_INITED) == 0) \
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panic("namei data not inited"); \
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if (((arg)->ni_debugflags & NAMEI_DBG_HADSTARTDIR) != 0) \
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panic("NDREINIT on namei data with NAMEI_DBG_HADSTARTDIR"); \
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(arg)->ni_debugflags = NAMEI_DBG_INITED; \
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}
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#else
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#define NDINIT_PREFILL(arg) do { } while (0)
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#define NDINIT_DBG(arg) do { } while (0)
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#define NDREINIT_DBG(arg) do { } while (0)
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#endif
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#define NDINIT_ALL(ndp, op, flags, segflg, namep, dirfd, startdir, rightsp) \
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do { \
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struct nameidata *_ndp = (ndp); \
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cap_rights_t *_rightsp = (rightsp); \
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MPASS(_rightsp != NULL); \
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NDINIT_PREFILL(_ndp); \
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NDINIT_DBG(_ndp); \
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_ndp->ni_cnd.cn_nameiop = op; \
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_ndp->ni_cnd.cn_flags = flags; \
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_ndp->ni_segflg = segflg; \
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_ndp->ni_dirp = namep; \
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_ndp->ni_dirfd = dirfd; \
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_ndp->ni_startdir = startdir; \
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_ndp->ni_resflags = 0; \
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filecaps_init(&_ndp->ni_filecaps); \
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_ndp->ni_rightsneeded = _rightsp; \
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} while (0)
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#define NDREINIT(ndp) do { \
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struct nameidata *_ndp = (ndp); \
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NDREINIT_DBG(_ndp); \
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filecaps_free(&_ndp->ni_filecaps); \
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_ndp->ni_resflags = 0; \
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_ndp->ni_startdir = NULL; \
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} while (0)
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#define NDPREINIT(ndp) do { \
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(ndp)->ni_dvp_seqc = SEQC_MOD; \
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(ndp)->ni_vp_seqc = SEQC_MOD; \
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} while (0)
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#define NDFREE_IOCTLCAPS(ndp) do { \
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struct nameidata *_ndp = (ndp); \
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filecaps_free(&_ndp->ni_filecaps); \
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} while (0)
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#define NDFREE_PNBUF(ndp) do { \
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struct nameidata *_ndp = (ndp); \
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MPASS(_ndp->ni_cnd.cn_pnbuf != NULL); \
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uma_zfree(namei_zone, _ndp->ni_cnd.cn_pnbuf); \
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_ndp->ni_cnd.cn_pnbuf = NULL; \
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} while (0)
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int namei(struct nameidata *ndp);
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int vfs_lookup(struct nameidata *ndp);
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int vfs_relookup(struct vnode *dvp, struct vnode **vpp,
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struct componentname *cnp, bool refstart);
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#define namei_setup_rootdir(ndp, cnp, pwd) do { \
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if (__predict_true((cnp->cn_flags & ISRESTARTED) == 0)) \
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ndp->ni_rootdir = pwd->pwd_adir; \
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else \
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ndp->ni_rootdir = pwd->pwd_rdir; \
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} while (0)
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#endif
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/*
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* Stats on usefulness of namei caches.
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*/
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struct nchstats {
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long ncs_goodhits; /* hits that we can really use */
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long ncs_neghits; /* negative hits that we can use */
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long ncs_badhits; /* hits we must drop */
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long ncs_falsehits; /* hits with id mismatch */
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long ncs_miss; /* misses */
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long ncs_long; /* long names that ignore cache */
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long ncs_pass2; /* names found with passes == 2 */
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long ncs_2passes; /* number of times we attempt it */
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};
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extern struct nchstats nchstats;
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#endif /* !_SYS_NAMEI_H_ */ |