aa2f6ddc3f
List devfs_dirents rather than vnodes off their shared struct cdev, this saves a pointer field in the vnode at the expense of a field in the devfs_dirent. There are often 100 times more vnodes so this is bargain. In addition it makes it harder for people to try to do stypid things like "finding the vnode from cdev". Since DEVFS handles all VCHR nodes now, we can do the vnode related cleanup in devfs_reclaim() instead of in dev_rel() and vgonel(). Similarly, we can do the struct cdev related cleanup in dev_rel() instead of devfs_reclaim(). rename idestroy_dev() to destroy_devl() for consistency. Add LIST_ENTRY de_alias to struct devfs_dirent. Remove v_specnext from struct vnode. Change si_hlist to si_alist in struct cdev. String new devfs vnodes' devfs_dirent on si_alist when we create them and take them off in devfs_reclaim(). Fix devfs_revoke() accordingly. Also don't clear fields devfs_reclaim() will clear when called from vgone(); Let devfs_reclaim() call dev_rel() instead of vgonel(). Move the usecount tracking from dev_rel() to devfs_reclaim(), and let dev_rel() take a struct cdev argument instead of vnode. Destroy SI_CHEAPCLONE devices in dev_rel() (instead of devfs_reclaim()) when they are no longer used. (This should maybe happen in devfs_close() instead.)
204 lines
6.4 KiB
C
204 lines
6.4 KiB
C
/*-
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 2000
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* Poul-Henning Kamp. All rights reserved.
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* Copyright (c) 2002
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* Dima Dorfman. All rights reserved.
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*
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* This code is derived from software donated to Berkeley by
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* Jan-Simon Pendry.
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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. 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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* @(#)kernfs.h 8.6 (Berkeley) 3/29/95
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* From: FreeBSD: src/sys/miscfs/kernfs/kernfs.h 1.14
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*
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* $FreeBSD$
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*/
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#ifndef _FS_DEVFS_DEVFS_H_
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#define _FS_DEVFS_DEVFS_H_
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#define DEVFS_MAGIC 0xdb0a087a
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/*
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* Identifiers. The ruleset and rule numbers are 16-bit values. The
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* "rule ID" is a combination of the ruleset and rule number; it
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* should be able to univocally describe a rule in the system. In
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* this implementation, the upper 16 bits of the rule ID is the
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* ruleset number; the lower 16 bits, the rule number within the
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* aforementioned ruleset.
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*/
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typedef uint16_t devfs_rnum;
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typedef uint16_t devfs_rsnum;
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typedef uint32_t devfs_rid;
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/*
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* Identifier manipulators.
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*/
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#define rid2rsn(rid) ((rid) >> 16)
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#define rid2rn(rid) ((rid) & 0xffff)
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#define mkrid(rsn, rn) ((rn) | ((rsn) << 16))
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/*
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* Plain DEVFS rule. This gets shared between kernel and userland
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* verbatim, so it shouldn't contain any pointers or other kernel- or
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* userland-specific values.
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*/
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struct devfs_rule {
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uint32_t dr_magic; /* Magic number. */
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devfs_rid dr_id; /* Identifier. */
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/*
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* Conditions under which this rule should be applied. These
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* are ANDed together since OR can be simulated by using
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* multiple rules. dr_icond determines which of the other
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* variables we should process.
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*/
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int dr_icond;
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#define DRC_DSWFLAGS 0x001
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#define DRC_PATHPTRN 0x002
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#define DRC_MAJOR 0x004
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int dr_dswflags; /* cdevsw flags to match. */
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#define DEVFS_MAXPTRNLEN 200
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char dr_pathptrn[DEVFS_MAXPTRNLEN]; /* Pattern to match path. */
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int dr_major; /* Device major number. */
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/*
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* Things to change. dr_iacts determines which of the other
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* variables we should process.
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*/
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int dr_iacts;
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#define DRA_BACTS 0x001
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#define DRA_UID 0x002
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#define DRA_GID 0x004
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#define DRA_MODE 0x008
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#define DRA_INCSET 0x010
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int dr_bacts; /* Boolean (on/off) action. */
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#define DRB_HIDE 0x001 /* Hide entry (DE_WHITEOUT). */
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#define DRB_UNHIDE 0x002 /* Unhide entry. */
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uid_t dr_uid;
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gid_t dr_gid;
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mode_t dr_mode;
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devfs_rsnum dr_incset; /* Included ruleset. */
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};
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/*
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* Rule-related ioctls.
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*/
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#define DEVFSIO_RADD _IOWR('D', 0, struct devfs_rule)
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#define DEVFSIO_RDEL _IOW('D', 1, devfs_rid)
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#define DEVFSIO_RAPPLY _IOW('D', 2, struct devfs_rule)
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#define DEVFSIO_RAPPLYID _IOW('D', 3, devfs_rid)
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#define DEVFSIO_RGETNEXT _IOWR('D', 4, struct devfs_rule)
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#define DEVFSIO_SUSE _IOW('D', 10, devfs_rsnum)
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#define DEVFSIO_SAPPLY _IOW('D', 11, devfs_rsnum)
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#define DEVFSIO_SGETNEXT _IOWR('D', 12, devfs_rsnum)
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/* XXX: DEVFSIO_RS_GET_INFO for refcount, active if any, etc. */
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#ifdef _KERNEL
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/*
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* These are default sizes for the DEVFS inode table and the overflow
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* table. If the default table overflows we allocate the overflow
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* table, the size of which can also be set with a sysctl. If the
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* overflow table fills you're toast.
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*/
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#ifndef NDEVFSINO
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#define NDEVFSINO 1024
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#endif
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#ifndef NDEVFSOVERFLOW
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#define NDEVFSOVERFLOW 32768
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#endif
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/*
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* This is the first "per mount" inode, these are used for directories
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* and symlinks and the like. Must be larger than the number of "true"
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* device nodes and symlinks. It is.
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*/
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#define DEVFSINOMOUNT 0x2000000
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#ifdef MALLOC_DECLARE
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MALLOC_DECLARE(M_DEVFS);
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#endif
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struct devfs_dirent {
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int de_inode;
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int de_flags;
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#define DE_WHITEOUT 0x1
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#define DE_DOT 0x2
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#define DE_DOTDOT 0x4
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struct dirent *de_dirent;
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TAILQ_ENTRY(devfs_dirent) de_list;
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TAILQ_HEAD(, devfs_dirent) de_dlist;
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LIST_ENTRY(devfs_dirent) de_alias;
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struct devfs_dirent *de_dir;
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int de_links;
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mode_t de_mode;
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uid_t de_uid;
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gid_t de_gid;
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struct label *de_label;
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struct timespec de_atime;
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struct timespec de_mtime;
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struct timespec de_ctime;
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struct vnode *de_vnode;
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char *de_symlink;
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};
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struct devfs_mount {
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struct mount *dm_mount;
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struct devfs_dirent *dm_rootdir;
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struct devfs_dirent *dm_basedir;
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unsigned dm_generation;
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struct devfs_dirent **dm_dirent;
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struct devfs_dirent **dm_overflow;
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int dm_inode;
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struct lock dm_lock;
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devfs_rsnum dm_ruleset;
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};
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/*
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* This is what we fill in dm_dirent[N] for a deleted entry.
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*/
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#define DE_DELETED ((struct devfs_dirent *)sizeof(struct devfs_dirent))
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#define VFSTODEVFS(mp) ((struct devfs_mount *)((mp)->mnt_data))
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void devfs_rules_apply(struct devfs_mount *dm, struct devfs_dirent *de);
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int devfs_rules_ioctl(struct mount *mp, u_long cmd, caddr_t data, struct thread *td);
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void devfs_rules_newmount(struct devfs_mount *dm, struct thread *td);
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int devfs_allocv (struct devfs_dirent *de, struct mount *mp, struct vnode **vpp, struct thread *td);
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struct cdev **devfs_itod (int inode);
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struct devfs_dirent **devfs_itode (struct devfs_mount *dm, int inode);
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int devfs_populate (struct devfs_mount *dm);
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struct devfs_dirent *devfs_newdirent (char *name, int namelen);
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void devfs_purge (struct devfs_dirent *dd);
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struct devfs_dirent *devfs_vmkdir (char *name, int namelen, struct devfs_dirent *dotdot);
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#endif /* _KERNEL */
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#endif /* !_FS_DEVFS_DEVFS_H_ */
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