89d10571db
devfs_delete() now recursively removes empty parent directories unless the DEVFS_DEL_NORECURSE flag is specified. devfs_delete() can't be called anymore with a parent directory vnode lock held because the possible parent directory deletion needs to lock the vnode. Thus we unlock the parent directory vnode in devfs_remove() before calling devfs_delete(). Call devfs_populate_vp() from devfs_symlink() and devfs_vptocnp() as now directories can get removed. Add a check for DE_DOOMED flag to devfs_populate_vp() because devfs_delete() drops dm_lock before the VI_DOOMED vnode flag gets set. This ensures that devfs_populate_vp() returns an error for directories which are in progress of deletion. Reviewed by: kib Discussed on: freebsd-current (mostly silence)
194 lines
6.2 KiB
C
194 lines
6.2 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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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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/*
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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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#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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struct cdev_priv *de_cdp;
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int de_inode;
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int de_flags;
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#define DE_WHITEOUT 0x01
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#define DE_DOT 0x02
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#define DE_DOTDOT 0x04
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#define DE_DOOMED 0x08
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#define DE_COVERED 0x10
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int de_holdcnt;
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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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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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u_int dm_idx;
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struct mount *dm_mount;
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struct devfs_dirent *dm_rootdir;
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unsigned dm_generation;
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int dm_holdcnt;
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struct sx dm_lock;
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devfs_rsnum dm_ruleset;
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};
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#define DEVFS_ROOTINO 2
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extern unsigned devfs_rule_depth;
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#define VFSTODEVFS(mp) ((struct devfs_mount *)((mp)->mnt_data))
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#define DEVFS_DE_HOLD(de) ((de)->de_holdcnt++)
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#define DEVFS_DE_DROP(de) (--(de)->de_holdcnt == 0)
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#define DEVFS_DMP_HOLD(dmp) ((dmp)->dm_holdcnt++)
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#define DEVFS_DMP_DROP(dmp) (--(dmp)->dm_holdcnt == 0)
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#define DEVFS_DEL_VNLOCKED 0x01
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#define DEVFS_DEL_NORECURSE 0x02
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void devfs_rules_apply(struct devfs_mount *dm, struct devfs_dirent *de);
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void devfs_rules_cleanup (struct devfs_mount *dm);
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int devfs_rules_ioctl(struct devfs_mount *dm, u_long cmd, caddr_t data, struct thread *td);
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int devfs_allocv(struct devfs_dirent *de, struct mount *mp, int lockmode,
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struct vnode **vpp);
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void devfs_delete(struct devfs_mount *dm, struct devfs_dirent *de, int flags);
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void devfs_dirent_free(struct devfs_dirent *de);
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void devfs_populate (struct devfs_mount *dm);
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void devfs_cleanup (struct devfs_mount *dm);
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void devfs_unmount_final(struct devfs_mount *mp);
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struct devfs_dirent *devfs_newdirent (char *name, int namelen);
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struct devfs_dirent *devfs_parent_dirent(struct devfs_dirent *de);
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struct devfs_dirent *devfs_vmkdir (struct devfs_mount *, char *name, int namelen, struct devfs_dirent *dotdot, u_int inode);
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struct devfs_dirent *devfs_find(struct devfs_dirent *dd, const char *name, int namelen, int type);
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#endif /* _KERNEL */
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#endif /* !_FS_DEVFS_DEVFS_H_ */
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