File: [local] / sys / sys / namei.h (download)
Revision 1.1.1.1 (vendor branch), Tue Mar 4 16:16:12 2008 UTC (16 years, 3 months ago) by nbrk
Branch: OPENBSD_4_2_BASE, MAIN
CVS Tags: jornada-partial-support-wip, HEAD Changes since 1.1: +0 -0 lines
Import of OpenBSD 4.2 release kernel tree with initial code to support
Jornada 720/728, StrongARM 1110-based handheld PC.
At this point kernel roots on NFS and boots into vfs_mountroot() and traps.
What is supported:
- glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode
(needs some palette tweaks for non black/white/blue colors, i think)
- saic, SA11x0 interrupt controller (needs cleanup)
- sacom, SA11x0 UART (supported only as boot console for now)
- SA11x0 GPIO controller fully supported (but can't handle multiple interrupt
handlers on one gpio pin)
- sassp, SSP port on SA11x0 that attaches spibus
- Jornada microcontroller (jmcu) to control kbd, battery, etc throught
the SPI bus (wskbd attaches on jmcu, but not tested)
- tod functions seem work
- initial code for SA-1111 (chip companion) : this is TODO
Next important steps, i think:
- gpio and intc on sa1111
- pcmcia support for sa11x0 (and sa1111 help logic)
- REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs)
- root on wd0! (using already supported PCMCIA-ATA)
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/* $OpenBSD: namei.h,v 1.20 2007/08/07 07:41:59 thib Exp $ */
/* $NetBSD: namei.h,v 1.11 1996/02/09 18:25:20 christos Exp $ */
/*
* Copyright (c) 1985, 1989, 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* 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. 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.
*
* @(#)namei.h 8.4 (Berkeley) 8/20/94
*/
#ifndef _SYS_NAMEI_H_
#define _SYS_NAMEI_H_
#include <sys/queue.h>
/*
* Encapsulation of namei parameters.
*/
struct nameidata {
/*
* Arguments to namei/lookup.
*/
const char *ni_dirp; /* pathname pointer */
enum uio_seg ni_segflg; /* location of pathname */
/* u_long ni_nameiop; namei operation */
/* u_long ni_flags; flags to namei */
/* struct proc *ni_proc; process requesting lookup */
/*
* Arguments to lookup.
*/
/* struct ucred *ni_cred; credentials */
struct vnode *ni_startdir; /* starting directory */
struct vnode *ni_rootdir; /* logical root directory */
/*
* Results: returned from/manipulated by lookup
*/
struct vnode *ni_vp; /* vnode of result */
struct vnode *ni_dvp; /* vnode of intermediate directory */
/*
* Shared between namei and lookup/commit routines.
*/
size_t ni_pathlen; /* remaining chars in path */
char *ni_next; /* next location in pathname */
u_long ni_loopcnt; /* count of symlinks encountered */
/*
* Lookup parameters: this structure describes the subset of
* information from the nameidata structure that is passed
* through the VOP interface.
*/
struct componentname {
/*
* Arguments to lookup.
*/
u_long cn_nameiop; /* namei operation */
u_long cn_flags; /* flags to namei */
struct proc *cn_proc; /* process requesting lookup */
struct ucred *cn_cred; /* credentials */
/*
* Shared between lookup and commit routines.
*/
char *cn_pnbuf; /* pathname buffer */
char *cn_nameptr; /* pointer to looked up name */
long cn_namelen; /* length of looked up component */
u_int32_t cn_hash; /* hash value of looked up name */
long cn_consume; /* chars to consume in lookup() */
} ni_cnd;
};
#ifdef _KERNEL
/*
* namei operations
*/
#define LOOKUP 0 /* perform name lookup only */
#define CREATE 1 /* setup for file creation */
#define DELETE 2 /* setup for file deletion */
#define RENAME 3 /* setup for file renaming */
#define OPMASK 3 /* mask for operation */
/*
* namei operational modifier flags, stored in ni_cnd.flags
*/
#define LOCKLEAF 0x0004 /* lock inode on return */
#define LOCKPARENT 0x0008 /* want parent vnode returned locked */
#define WANTPARENT 0x0010 /* want parent vnode returned unlocked */
#define NOCACHE 0x0020 /* name must not be left in cache */
#define FOLLOW 0x0040 /* follow symbolic links */
#define NOFOLLOW 0x0000 /* do not follow symbolic links (pseudo) */
#define MODMASK 0x00fc /* mask of operational modifiers */
/*
* Namei parameter descriptors.
*
* SAVENAME may be set by either the callers of namei or by VOP_LOOKUP.
* If the caller of namei sets the flag (for example execve wants to
* know the name of the program that is being executed), then it must
* free the buffer. If VOP_LOOKUP sets the flag, then the buffer must
* be freed by either the commit routine or the VOP_ABORT routine.
* SAVESTART is set only by the callers of namei. It implies SAVENAME
* plus the addition of saving the parent directory that contains the
* name in ni_startdir. It allows repeated calls to lookup for the
* name being sought. The caller is responsible for releasing the
* buffer and for vrele'ing ni_startdir.
*/
#define NOCROSSMOUNT 0x000100 /* do not cross mount points */
#define RDONLY 0x000200 /* lookup with read-only semantics */
#define HASBUF 0x000400 /* has allocated pathname buffer */
#define SAVENAME 0x000800 /* save pathanme buffer */
#define SAVESTART 0x001000 /* save starting directory */
#define ISDOTDOT 0x002000 /* current component name is .. */
#define MAKEENTRY 0x004000 /* entry is to be added to name cache */
#define ISLASTCN 0x008000 /* this is last component of pathname */
#define ISSYMLINK 0x010000 /* symlink needs interpretation */
#define REQUIREDIR 0x080000 /* must be a directory */
#define STRIPSLASHES 0x100000 /* strip trailing slashes */
#define PDIRUNLOCK 0x200000 /* vfs_lookup() unlocked parent dir */
/*
* Initialization of an nameidata structure.
*/
#define NDINIT(ndp, op, flags, segflg, namep, p) { \
(ndp)->ni_cnd.cn_nameiop = op; \
(ndp)->ni_cnd.cn_flags = flags; \
(ndp)->ni_segflg = segflg; \
(ndp)->ni_dirp = namep; \
(ndp)->ni_cnd.cn_proc = p; \
}
#endif
/*
* This structure describes the elements in the cache of recent
* names looked up by namei. NCHNAMLEN is sized to make structure
* size a power of two to optimize malloc's. Minimum reasonable
* size is 15.
*/
#define NCHNAMLEN 31 /* maximum name segment length we bother with */
struct namecache {
LIST_ENTRY(namecache) nc_hash; /* hash chain */
LIST_ENTRY(namecache) nc_vhash; /* (reverse) directory hash chain */
TAILQ_ENTRY(namecache) nc_lru; /* LRU chain */
struct vnode *nc_dvp; /* vnode of parent of name */
u_long nc_dvpid; /* capability number of nc_dvp */
struct vnode *nc_vp; /* vnode the name refers to */
u_long nc_vpid; /* capability number of nc_vp */
char nc_nlen; /* length of name */
char nc_name[NCHNAMLEN]; /* segment name */
};
#ifdef _KERNEL
int namei(struct nameidata *ndp);
int lookup(struct nameidata *ndp);
int relookup(struct vnode *dvp, struct vnode **vpp,
struct componentname *cnp);
void cache_purge(struct vnode *);
int cache_lookup(struct vnode *, struct vnode **, struct componentname *);
void cache_enter(struct vnode *, struct vnode *, struct componentname *);
int cache_revlookup(struct vnode *, struct vnode **, char **, char *);
void nchinit(void);
struct mount;
void cache_purgevfs(struct mount *);
extern struct pool namei_pool;
#endif
/*
* Stats on usefulness of namei caches.
*/
struct nchstats {
long ncs_goodhits; /* hits that we can really use */
long ncs_neghits; /* negative hits that we can use */
long ncs_badhits; /* hits we must drop */
long ncs_falsehits; /* hits with id mismatch */
long ncs_miss; /* misses */
long ncs_long; /* long names that ignore cache */
long ncs_pass2; /* names found with passes == 2 */
long ncs_2passes; /* number of times we attempt it */
long ncs_revhits; /* reverse-cache hits */
long ncs_revmiss; /* reverse-cache misses */
};
/* These sysctl names are only really used by sysctl(8) */
#define KERN_NCHSTATS_GOODHITS 1
#define KERN_NCHSTATS_NEGHITS 2
#define KERN_NCHSTATS_BADHITS 3
#define KERN_NCHSTATS_FALSEHITS 4
#define KERN_NCHSTATS_MISS 5
#define KERN_NCHSTATS_LONG 6
#define KERN_NCHSTATS_PASS2 7
#define KERN_NCHSTATS_2PASSES 8
#define KERN_NCHSTATS_REVHITS 9
#define KERN_NCHSTATS_REVMISS 10
#define KERN_NCHSTATS_MAXID 11
#define CTL_KERN_NCHSTATS_NAMES { \
{ 0, 0 }, \
{ "good_hits", CTLTYPE_INT }, \
{ "negative_hits", CTLTYPE_INT }, \
{ "bad_hits", CTLTYPE_INT }, \
{ "false_hits", CTLTYPE_INT }, \
{ "misses", CTLTYPE_INT }, \
{ "long_names", CTLTYPE_INT }, \
{ "pass2", CTLTYPE_INT }, \
{ "2passes", CTLTYPE_INT }, \
{ "ncs_revhits", CTLTYPE_INT }, \
{ "ncs_revmiss", CTLTYPE_INT }, \
}
#endif /* !_SYS_NAMEI_H_ */