18d0a0dd51
Remove this argument and pass curthread directly to underlying VOP_LOCK1() VFS method. This modify makes the code cleaner and in particular remove an annoying dependence helping next lockmgr() cleanup. KPI results, obviously, changed. Manpage and FreeBSD_version will be updated through further commits. As a side note, would be valuable to say that next commits will address a similar cleanup about VFS methods, in particular vop_lock1 and vop_unlock. Tested by: Diego Sardina <siarodx at gmail dot com>, Andrea Di Pasquale <whyx dot it at gmail dot com>
2489 lines
54 KiB
C
2489 lines
54 KiB
C
/*-
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* Copyright (c) 2005 David Xu <davidxu@freebsd.org>
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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*/
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/*
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* POSIX message queue implementation.
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*
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* 1) A mqueue filesystem can be mounted, each message queue appears
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* in mounted directory, user can change queue's permission and
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* ownership, or remove a queue. Manually creating a file in the
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* directory causes a message queue to be created in the kernel with
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* default message queue attributes applied and same name used, this
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* method is not advocated since mq_open syscall allows user to specify
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* different attributes. Also the file system can be mounted multiple
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* times at different mount points but shows same contents.
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*
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* 2) Standard POSIX message queue API. The syscalls do not use vfs layer,
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* but directly operate on internal data structure, this allows user to
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* use the IPC facility without having to mount mqueue file system.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/limits.h>
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#include <sys/buf.h>
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#include <sys/dirent.h>
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#include <sys/event.h>
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#include <sys/eventhandler.h>
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#include <sys/fcntl.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mount.h>
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#include <sys/mqueue.h>
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#include <sys/mutex.h>
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#include <sys/namei.h>
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#include <sys/posix4.h>
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#include <sys/poll.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/queue.h>
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#include <sys/sysproto.h>
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#include <sys/stat.h>
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#include <sys/syscall.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysent.h>
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#include <sys/sx.h>
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#include <sys/sysctl.h>
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#include <sys/taskqueue.h>
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#include <sys/unistd.h>
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#include <sys/vnode.h>
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#include <machine/atomic.h>
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/*
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* Limits and constants
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*/
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#define MQFS_NAMELEN NAME_MAX
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#define MQFS_DELEN (8 + MQFS_NAMELEN)
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/* node types */
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typedef enum {
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mqfstype_none = 0,
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mqfstype_root,
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mqfstype_dir,
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mqfstype_this,
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mqfstype_parent,
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mqfstype_file,
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mqfstype_symlink,
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} mqfs_type_t;
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struct mqfs_node;
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/*
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* mqfs_info: describes a mqfs instance
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*/
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struct mqfs_info {
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struct sx mi_lock;
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struct mqfs_node *mi_root;
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struct unrhdr *mi_unrhdr;
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};
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struct mqfs_vdata {
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LIST_ENTRY(mqfs_vdata) mv_link;
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struct mqfs_node *mv_node;
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struct vnode *mv_vnode;
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struct task mv_task;
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};
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/*
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* mqfs_node: describes a node (file or directory) within a mqfs
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*/
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struct mqfs_node {
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char mn_name[MQFS_NAMELEN+1];
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struct mqfs_info *mn_info;
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struct mqfs_node *mn_parent;
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LIST_HEAD(,mqfs_node) mn_children;
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LIST_ENTRY(mqfs_node) mn_sibling;
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LIST_HEAD(,mqfs_vdata) mn_vnodes;
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int mn_refcount;
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mqfs_type_t mn_type;
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int mn_deleted;
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u_int32_t mn_fileno;
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void *mn_data;
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struct timespec mn_birth;
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struct timespec mn_ctime;
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struct timespec mn_atime;
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struct timespec mn_mtime;
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uid_t mn_uid;
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gid_t mn_gid;
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int mn_mode;
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};
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#define VTON(vp) (((struct mqfs_vdata *)((vp)->v_data))->mv_node)
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#define VTOMQ(vp) ((struct mqueue *)(VTON(vp)->mn_data))
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#define VFSTOMQFS(m) ((struct mqfs_info *)((m)->mnt_data))
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#define FPTOMQ(fp) ((struct mqueue *)(((struct mqfs_node *) \
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(fp)->f_data)->mn_data))
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TAILQ_HEAD(msgq, mqueue_msg);
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struct mqueue;
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struct mqueue_notifier {
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LIST_ENTRY(mqueue_notifier) nt_link;
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struct sigevent nt_sigev;
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ksiginfo_t nt_ksi;
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struct proc *nt_proc;
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};
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struct mqueue {
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struct mtx mq_mutex;
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int mq_flags;
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long mq_maxmsg;
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long mq_msgsize;
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long mq_curmsgs;
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long mq_totalbytes;
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struct msgq mq_msgq;
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int mq_receivers;
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int mq_senders;
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struct selinfo mq_rsel;
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struct selinfo mq_wsel;
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struct mqueue_notifier *mq_notifier;
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};
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#define MQ_RSEL 0x01
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#define MQ_WSEL 0x02
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struct mqueue_msg {
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TAILQ_ENTRY(mqueue_msg) msg_link;
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unsigned int msg_prio;
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unsigned int msg_size;
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/* following real data... */
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};
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SYSCTL_NODE(_kern, OID_AUTO, mqueue, CTLFLAG_RW, 0,
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"POSIX real time message queue");
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static int default_maxmsg = 10;
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static int default_msgsize = 1024;
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static int maxmsg = 100;
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SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsg, CTLFLAG_RW,
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&maxmsg, 0, "Default maximum messages in queue");
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static int maxmsgsize = 16384;
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SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsgsize, CTLFLAG_RW,
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&maxmsgsize, 0, "Default maximum message size");
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static int maxmq = 100;
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SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmq, CTLFLAG_RW,
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&maxmq, 0, "maximum message queues");
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static int curmq = 0;
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SYSCTL_INT(_kern_mqueue, OID_AUTO, curmq, CTLFLAG_RW,
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&curmq, 0, "current message queue number");
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static int unloadable = 0;
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static MALLOC_DEFINE(M_MQUEUEDATA, "mqdata", "mqueue data");
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static eventhandler_tag exit_tag;
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/* Only one instance per-system */
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static struct mqfs_info mqfs_data;
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static uma_zone_t mqnode_zone;
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static uma_zone_t mqueue_zone;
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static uma_zone_t mvdata_zone;
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static uma_zone_t mqnoti_zone;
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static struct vop_vector mqfs_vnodeops;
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static struct fileops mqueueops;
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/*
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* Directory structure construction and manipulation
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*/
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#ifdef notyet
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static struct mqfs_node *mqfs_create_dir(struct mqfs_node *parent,
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const char *name, int namelen, struct ucred *cred, int mode);
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static struct mqfs_node *mqfs_create_link(struct mqfs_node *parent,
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const char *name, int namelen, struct ucred *cred, int mode);
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#endif
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static struct mqfs_node *mqfs_create_file(struct mqfs_node *parent,
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const char *name, int namelen, struct ucred *cred, int mode);
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static int mqfs_destroy(struct mqfs_node *mn);
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static void mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn);
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static void mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn);
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static int mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn);
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/*
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* Message queue construction and maniplation
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*/
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static struct mqueue *mqueue_alloc(const struct mq_attr *attr);
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static void mqueue_free(struct mqueue *mq);
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static int mqueue_send(struct mqueue *mq, const char *msg_ptr,
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size_t msg_len, unsigned msg_prio, int waitok,
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const struct timespec *abs_timeout);
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static int mqueue_receive(struct mqueue *mq, char *msg_ptr,
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size_t msg_len, unsigned *msg_prio, int waitok,
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const struct timespec *abs_timeout);
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static int _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg,
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int timo);
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static int _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg,
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int timo);
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static void mqueue_send_notification(struct mqueue *mq);
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static void mqueue_fdclose(struct thread *td, int fd, struct file *fp);
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static void mq_proc_exit(void *arg, struct proc *p);
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/*
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* kqueue filters
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*/
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static void filt_mqdetach(struct knote *kn);
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static int filt_mqread(struct knote *kn, long hint);
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static int filt_mqwrite(struct knote *kn, long hint);
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struct filterops mq_rfiltops =
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{ 1, NULL, filt_mqdetach, filt_mqread };
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struct filterops mq_wfiltops =
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{ 1, NULL, filt_mqdetach, filt_mqwrite };
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/*
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* Initialize fileno bitmap
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*/
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static void
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mqfs_fileno_init(struct mqfs_info *mi)
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{
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struct unrhdr *up;
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up = new_unrhdr(1, INT_MAX, NULL);
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mi->mi_unrhdr = up;
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}
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/*
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* Tear down fileno bitmap
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*/
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static void
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mqfs_fileno_uninit(struct mqfs_info *mi)
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{
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struct unrhdr *up;
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up = mi->mi_unrhdr;
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mi->mi_unrhdr = NULL;
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delete_unrhdr(up);
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}
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/*
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* Allocate a file number
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*/
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static void
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mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn)
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{
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/* make sure our parent has a file number */
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if (mn->mn_parent && !mn->mn_parent->mn_fileno)
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mqfs_fileno_alloc(mi, mn->mn_parent);
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switch (mn->mn_type) {
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case mqfstype_root:
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case mqfstype_dir:
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case mqfstype_file:
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case mqfstype_symlink:
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mn->mn_fileno = alloc_unr(mi->mi_unrhdr);
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break;
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case mqfstype_this:
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KASSERT(mn->mn_parent != NULL,
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("mqfstype_this node has no parent"));
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mn->mn_fileno = mn->mn_parent->mn_fileno;
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break;
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case mqfstype_parent:
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KASSERT(mn->mn_parent != NULL,
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("mqfstype_parent node has no parent"));
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if (mn->mn_parent == mi->mi_root) {
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mn->mn_fileno = mn->mn_parent->mn_fileno;
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break;
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}
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KASSERT(mn->mn_parent->mn_parent != NULL,
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("mqfstype_parent node has no grandparent"));
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mn->mn_fileno = mn->mn_parent->mn_parent->mn_fileno;
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break;
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default:
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KASSERT(0,
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("mqfs_fileno_alloc() called for unknown type node: %d",
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mn->mn_type));
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break;
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}
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}
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/*
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* Release a file number
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*/
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static void
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mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn)
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{
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switch (mn->mn_type) {
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case mqfstype_root:
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case mqfstype_dir:
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case mqfstype_file:
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case mqfstype_symlink:
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free_unr(mi->mi_unrhdr, mn->mn_fileno);
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break;
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case mqfstype_this:
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case mqfstype_parent:
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/* ignore these, as they don't "own" their file number */
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break;
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default:
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KASSERT(0,
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("mqfs_fileno_free() called for unknown type node: %d",
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mn->mn_type));
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break;
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}
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}
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static __inline struct mqfs_node *
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mqnode_alloc(void)
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{
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return uma_zalloc(mqnode_zone, M_WAITOK | M_ZERO);
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}
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static __inline void
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mqnode_free(struct mqfs_node *node)
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{
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uma_zfree(mqnode_zone, node);
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}
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static __inline void
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mqnode_addref(struct mqfs_node *node)
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{
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atomic_fetchadd_int(&node->mn_refcount, 1);
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}
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static __inline void
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mqnode_release(struct mqfs_node *node)
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{
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int old, exp;
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old = atomic_fetchadd_int(&node->mn_refcount, -1);
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if (node->mn_type == mqfstype_dir ||
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node->mn_type == mqfstype_root)
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exp = 3; /* include . and .. */
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else
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exp = 1;
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if (old == exp)
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mqfs_destroy(node);
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}
|
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|
|
/*
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* Add a node to a directory
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*/
|
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static int
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mqfs_add_node(struct mqfs_node *parent, struct mqfs_node *node)
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|
{
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KASSERT(parent != NULL, ("%s(): parent is NULL", __func__));
|
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KASSERT(parent->mn_info != NULL,
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|
("%s(): parent has no mn_info", __func__));
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KASSERT(parent->mn_type == mqfstype_dir ||
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parent->mn_type == mqfstype_root,
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("%s(): parent is not a directory", __func__));
|
|
|
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node->mn_info = parent->mn_info;
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node->mn_parent = parent;
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LIST_INIT(&node->mn_children);
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|
LIST_INIT(&node->mn_vnodes);
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LIST_INSERT_HEAD(&parent->mn_children, node, mn_sibling);
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mqnode_addref(parent);
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return (0);
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}
|
|
|
|
static struct mqfs_node *
|
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mqfs_create_node(const char *name, int namelen, struct ucred *cred, int mode,
|
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int nodetype)
|
|
{
|
|
struct mqfs_node *node;
|
|
|
|
node = mqnode_alloc();
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strncpy(node->mn_name, name, namelen);
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node->mn_type = nodetype;
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node->mn_refcount = 1;
|
|
getnanotime(&node->mn_birth);
|
|
node->mn_ctime = node->mn_atime = node->mn_mtime
|
|
= node->mn_birth;
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|
node->mn_uid = cred->cr_uid;
|
|
node->mn_gid = cred->cr_gid;
|
|
node->mn_mode = mode;
|
|
return (node);
|
|
}
|
|
|
|
/*
|
|
* Create a file
|
|
*/
|
|
static struct mqfs_node *
|
|
mqfs_create_file(struct mqfs_node *parent, const char *name, int namelen,
|
|
struct ucred *cred, int mode)
|
|
{
|
|
struct mqfs_node *node;
|
|
|
|
node = mqfs_create_node(name, namelen, cred, mode, mqfstype_file);
|
|
if (mqfs_add_node(parent, node) != 0) {
|
|
mqnode_free(node);
|
|
return (NULL);
|
|
}
|
|
return (node);
|
|
}
|
|
|
|
/*
|
|
* Add . and .. to a directory
|
|
*/
|
|
static int
|
|
mqfs_fixup_dir(struct mqfs_node *parent)
|
|
{
|
|
struct mqfs_node *dir;
|
|
|
|
dir = mqnode_alloc();
|
|
dir->mn_name[0] = '.';
|
|
dir->mn_type = mqfstype_this;
|
|
dir->mn_refcount = 1;
|
|
if (mqfs_add_node(parent, dir) != 0) {
|
|
mqnode_free(dir);
|
|
return (-1);
|
|
}
|
|
|
|
dir = mqnode_alloc();
|
|
dir->mn_name[0] = dir->mn_name[1] = '.';
|
|
dir->mn_type = mqfstype_parent;
|
|
dir->mn_refcount = 1;
|
|
|
|
if (mqfs_add_node(parent, dir) != 0) {
|
|
mqnode_free(dir);
|
|
return (-1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
#ifdef notyet
|
|
|
|
/*
|
|
* Create a directory
|
|
*/
|
|
static struct mqfs_node *
|
|
mqfs_create_dir(struct mqfs_node *parent, const char *name, int namelen,
|
|
struct ucred *cred, int mode)
|
|
{
|
|
struct mqfs_node *node;
|
|
|
|
node = mqfs_create_node(name, namelen, cred, mode, mqfstype_dir);
|
|
if (mqfs_add_node(parent, node) != 0) {
|
|
mqnode_free(node);
|
|
return (NULL);
|
|
}
|
|
|
|
if (mqfs_fixup_dir(node) != 0) {
|
|
mqfs_destroy(node);
|
|
return (NULL);
|
|
}
|
|
return (node);
|
|
}
|
|
|
|
/*
|
|
* Create a symlink
|
|
*/
|
|
static struct mqfs_node *
|
|
mqfs_create_link(struct mqfs_node *parent, const char *name, int namelen,
|
|
struct ucred *cred, int mode)
|
|
{
|
|
struct mqfs_node *node;
|
|
|
|
node = mqfs_create_node(name, namelen, cred, mode, mqfstype_symlink);
|
|
if (mqfs_add_node(parent, node) != 0) {
|
|
mqnode_free(node);
|
|
return (NULL);
|
|
}
|
|
return (node);
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Destroy a node or a tree of nodes
|
|
*/
|
|
static int
|
|
mqfs_destroy(struct mqfs_node *node)
|
|
{
|
|
struct mqfs_node *parent;
|
|
|
|
KASSERT(node != NULL,
|
|
("%s(): node is NULL", __func__));
|
|
KASSERT(node->mn_info != NULL,
|
|
("%s(): node has no mn_info", __func__));
|
|
|
|
/* destroy children */
|
|
if (node->mn_type == mqfstype_dir || node->mn_type == mqfstype_root)
|
|
while (! LIST_EMPTY(&node->mn_children))
|
|
mqfs_destroy(LIST_FIRST(&node->mn_children));
|
|
|
|
/* unlink from parent */
|
|
if ((parent = node->mn_parent) != NULL) {
|
|
KASSERT(parent->mn_info == node->mn_info,
|
|
("%s(): parent has different mn_info", __func__));
|
|
LIST_REMOVE(node, mn_sibling);
|
|
}
|
|
|
|
if (node->mn_fileno != 0)
|
|
mqfs_fileno_free(node->mn_info, node);
|
|
if (node->mn_data != NULL)
|
|
mqueue_free(node->mn_data);
|
|
mqnode_free(node);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Mount a mqfs instance
|
|
*/
|
|
static int
|
|
mqfs_mount(struct mount *mp, struct thread *td)
|
|
{
|
|
struct statfs *sbp;
|
|
|
|
if (mp->mnt_flag & MNT_UPDATE)
|
|
return (EOPNOTSUPP);
|
|
|
|
mp->mnt_data = &mqfs_data;
|
|
MNT_ILOCK(mp);
|
|
mp->mnt_flag |= MNT_LOCAL;
|
|
mp->mnt_kern_flag |= MNTK_MPSAFE;
|
|
MNT_IUNLOCK(mp);
|
|
vfs_getnewfsid(mp);
|
|
|
|
sbp = &mp->mnt_stat;
|
|
vfs_mountedfrom(mp, "mqueue");
|
|
sbp->f_bsize = PAGE_SIZE;
|
|
sbp->f_iosize = PAGE_SIZE;
|
|
sbp->f_blocks = 1;
|
|
sbp->f_bfree = 0;
|
|
sbp->f_bavail = 0;
|
|
sbp->f_files = 1;
|
|
sbp->f_ffree = 0;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Unmount a mqfs instance
|
|
*/
|
|
static int
|
|
mqfs_unmount(struct mount *mp, int mntflags, struct thread *td)
|
|
{
|
|
int error;
|
|
|
|
error = vflush(mp, 0, (mntflags & MNT_FORCE) ? FORCECLOSE : 0, td);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return a root vnode
|
|
*/
|
|
static int
|
|
mqfs_root(struct mount *mp, int flags, struct vnode **vpp, struct thread *td)
|
|
{
|
|
struct mqfs_info *mqfs;
|
|
int ret;
|
|
|
|
mqfs = VFSTOMQFS(mp);
|
|
sx_xlock(&mqfs->mi_lock);
|
|
ret = mqfs_allocv(mp, vpp, mqfs->mi_root);
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
return (ret);
|
|
}
|
|
|
|
/*
|
|
* Return filesystem stats
|
|
*/
|
|
static int
|
|
mqfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
|
|
{
|
|
/* XXX update statistics */
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Initialize a mqfs instance
|
|
*/
|
|
static int
|
|
mqfs_init(struct vfsconf *vfc)
|
|
{
|
|
struct mqfs_node *root;
|
|
struct mqfs_info *mi;
|
|
|
|
mqnode_zone = uma_zcreate("mqnode", sizeof(struct mqfs_node),
|
|
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
|
|
mqueue_zone = uma_zcreate("mqueue", sizeof(struct mqueue),
|
|
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
|
|
mvdata_zone = uma_zcreate("mvdata",
|
|
sizeof(struct mqfs_vdata), NULL, NULL, NULL,
|
|
NULL, UMA_ALIGN_PTR, 0);
|
|
mqnoti_zone = uma_zcreate("mqnotifier", sizeof(struct mqueue_notifier),
|
|
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
|
|
mi = &mqfs_data;
|
|
sx_init(&mi->mi_lock, "mqfs lock");
|
|
/* set up the root diretory */
|
|
root = mqfs_create_node("/", 1, curthread->td_ucred, 01777,
|
|
mqfstype_root);
|
|
root->mn_info = mi;
|
|
LIST_INIT(&root->mn_children);
|
|
LIST_INIT(&root->mn_vnodes);
|
|
mi->mi_root = root;
|
|
mqfs_fileno_init(mi);
|
|
mqfs_fileno_alloc(mi, root);
|
|
mqfs_fixup_dir(root);
|
|
exit_tag = EVENTHANDLER_REGISTER(process_exit, mq_proc_exit, NULL,
|
|
EVENTHANDLER_PRI_ANY);
|
|
mq_fdclose = mqueue_fdclose;
|
|
p31b_setcfg(CTL_P1003_1B_MESSAGE_PASSING, _POSIX_MESSAGE_PASSING);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Destroy a mqfs instance
|
|
*/
|
|
static int
|
|
mqfs_uninit(struct vfsconf *vfc)
|
|
{
|
|
struct mqfs_info *mi;
|
|
|
|
if (!unloadable)
|
|
return (EOPNOTSUPP);
|
|
EVENTHANDLER_DEREGISTER(process_exit, exit_tag);
|
|
mi = &mqfs_data;
|
|
mqfs_destroy(mi->mi_root);
|
|
mi->mi_root = NULL;
|
|
mqfs_fileno_uninit(mi);
|
|
sx_destroy(&mi->mi_lock);
|
|
uma_zdestroy(mqnode_zone);
|
|
uma_zdestroy(mqueue_zone);
|
|
uma_zdestroy(mvdata_zone);
|
|
uma_zdestroy(mqnoti_zone);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* task routine
|
|
*/
|
|
static void
|
|
do_recycle(void *context, int pending __unused)
|
|
{
|
|
struct vnode *vp = (struct vnode *)context;
|
|
|
|
vrecycle(vp, curthread);
|
|
vdrop(vp);
|
|
}
|
|
|
|
/*
|
|
* Allocate a vnode
|
|
*/
|
|
static int
|
|
mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn)
|
|
{
|
|
struct mqfs_vdata *vd;
|
|
int error;
|
|
|
|
LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
|
|
if (vd->mv_vnode->v_mount == mp)
|
|
break;
|
|
}
|
|
|
|
if (vd != NULL) {
|
|
if (vget(vd->mv_vnode, 0, curthread) == 0) {
|
|
*vpp = vd->mv_vnode;
|
|
vn_lock(*vpp, LK_RETRY | LK_EXCLUSIVE);
|
|
return (0);
|
|
}
|
|
/* XXX if this can happen, we're in trouble */
|
|
}
|
|
|
|
error = getnewvnode("mqueue", mp, &mqfs_vnodeops, vpp);
|
|
if (error)
|
|
return (error);
|
|
vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY);
|
|
error = insmntque(*vpp, mp);
|
|
if (error != 0) {
|
|
*vpp = NULLVP;
|
|
return (error);
|
|
}
|
|
vd = uma_zalloc(mvdata_zone, M_WAITOK);
|
|
(*vpp)->v_data = vd;
|
|
vd->mv_vnode = *vpp;
|
|
vd->mv_node = pn;
|
|
TASK_INIT(&vd->mv_task, 0, do_recycle, *vpp);
|
|
LIST_INSERT_HEAD(&pn->mn_vnodes, vd, mv_link);
|
|
mqnode_addref(pn);
|
|
switch (pn->mn_type) {
|
|
case mqfstype_root:
|
|
(*vpp)->v_vflag = VV_ROOT;
|
|
/* fall through */
|
|
case mqfstype_dir:
|
|
case mqfstype_this:
|
|
case mqfstype_parent:
|
|
(*vpp)->v_type = VDIR;
|
|
break;
|
|
case mqfstype_file:
|
|
(*vpp)->v_type = VREG;
|
|
break;
|
|
case mqfstype_symlink:
|
|
(*vpp)->v_type = VLNK;
|
|
break;
|
|
case mqfstype_none:
|
|
KASSERT(0, ("mqfs_allocf called for null node\n"));
|
|
default:
|
|
panic("%s has unexpected type: %d", pn->mn_name, pn->mn_type);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Search a directory entry
|
|
*/
|
|
static struct mqfs_node *
|
|
mqfs_search(struct mqfs_node *pd, const char *name, int len)
|
|
{
|
|
struct mqfs_node *pn;
|
|
|
|
LIST_FOREACH(pn, &pd->mn_children, mn_sibling) {
|
|
if (strncmp(pn->mn_name, name, len) == 0)
|
|
return (pn);
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Look up a file or directory.
|
|
*/
|
|
static int
|
|
mqfs_lookupx(struct vop_cachedlookup_args *ap)
|
|
{
|
|
struct componentname *cnp;
|
|
struct vnode *dvp, **vpp;
|
|
struct mqfs_node *pd;
|
|
struct mqfs_node *pn;
|
|
int nameiop, flags, error, namelen;
|
|
char *pname;
|
|
struct thread *td;
|
|
|
|
cnp = ap->a_cnp;
|
|
vpp = ap->a_vpp;
|
|
dvp = ap->a_dvp;
|
|
pname = cnp->cn_nameptr;
|
|
namelen = cnp->cn_namelen;
|
|
td = cnp->cn_thread;
|
|
flags = cnp->cn_flags;
|
|
nameiop = cnp->cn_nameiop;
|
|
pd = VTON(dvp);
|
|
pn = NULL;
|
|
*vpp = NULLVP;
|
|
|
|
if (dvp->v_type != VDIR)
|
|
return (ENOTDIR);
|
|
|
|
error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread);
|
|
if (error)
|
|
return (error);
|
|
|
|
/* shortcut: check if the name is too long */
|
|
if (cnp->cn_namelen >= MQFS_NAMELEN)
|
|
return (ENOENT);
|
|
|
|
/* self */
|
|
if (namelen == 1 && pname[0] == '.') {
|
|
if ((flags & ISLASTCN) && nameiop != LOOKUP)
|
|
return (EINVAL);
|
|
pn = pd;
|
|
*vpp = dvp;
|
|
VREF(dvp);
|
|
return (0);
|
|
}
|
|
|
|
/* parent */
|
|
if (cnp->cn_flags & ISDOTDOT) {
|
|
if (dvp->v_vflag & VV_ROOT)
|
|
return (EIO);
|
|
if ((flags & ISLASTCN) && nameiop != LOOKUP)
|
|
return (EINVAL);
|
|
VOP_UNLOCK(dvp, 0, cnp->cn_thread);
|
|
KASSERT(pd->mn_parent, ("non-root directory has no parent"));
|
|
pn = pd->mn_parent;
|
|
error = mqfs_allocv(dvp->v_mount, vpp, pn);
|
|
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
|
|
return (error);
|
|
}
|
|
|
|
/* named node */
|
|
pn = mqfs_search(pd, pname, namelen);
|
|
|
|
/* found */
|
|
if (pn != NULL) {
|
|
/* DELETE */
|
|
if (nameiop == DELETE && (flags & ISLASTCN)) {
|
|
error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
|
|
if (error)
|
|
return (error);
|
|
if (*vpp == dvp) {
|
|
VREF(dvp);
|
|
*vpp = dvp;
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
/* allocate vnode */
|
|
error = mqfs_allocv(dvp->v_mount, vpp, pn);
|
|
if (error == 0 && cnp->cn_flags & MAKEENTRY)
|
|
cache_enter(dvp, *vpp, cnp);
|
|
return (error);
|
|
}
|
|
|
|
/* not found */
|
|
|
|
/* will create a new entry in the directory ? */
|
|
if ((nameiop == CREATE || nameiop == RENAME) && (flags & LOCKPARENT)
|
|
&& (flags & ISLASTCN)) {
|
|
error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
|
|
if (error)
|
|
return (error);
|
|
cnp->cn_flags |= SAVENAME;
|
|
return (EJUSTRETURN);
|
|
}
|
|
return (ENOENT);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_lookup_args {
|
|
struct vop_generic_args a_gen;
|
|
struct vnode *a_dvp;
|
|
struct vnode **a_vpp;
|
|
struct componentname *a_cnp;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* vnode lookup operation
|
|
*/
|
|
static int
|
|
mqfs_lookup(struct vop_cachedlookup_args *ap)
|
|
{
|
|
struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
|
|
int rc;
|
|
|
|
sx_xlock(&mqfs->mi_lock);
|
|
rc = mqfs_lookupx(ap);
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
return (rc);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_create_args {
|
|
struct vnode *a_dvp;
|
|
struct vnode **a_vpp;
|
|
struct componentname *a_cnp;
|
|
struct vattr *a_vap;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* vnode creation operation
|
|
*/
|
|
static int
|
|
mqfs_create(struct vop_create_args *ap)
|
|
{
|
|
struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
|
|
struct componentname *cnp = ap->a_cnp;
|
|
struct mqfs_node *pd;
|
|
struct mqfs_node *pn;
|
|
struct mqueue *mq;
|
|
int error;
|
|
|
|
pd = VTON(ap->a_dvp);
|
|
if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir)
|
|
return (ENOTDIR);
|
|
mq = mqueue_alloc(NULL);
|
|
if (mq == NULL)
|
|
return (EAGAIN);
|
|
sx_xlock(&mqfs->mi_lock);
|
|
#if 0
|
|
/* named node */
|
|
pn = mqfs_search(pd, cnp->cn_nameptr, cnp->cn_namelen);
|
|
if (pn != NULL) {
|
|
mqueue_free(mq);
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
return (EEXIST);
|
|
}
|
|
#else
|
|
if ((cnp->cn_flags & HASBUF) == 0)
|
|
panic("%s: no name", __func__);
|
|
#endif
|
|
pn = mqfs_create_file(pd, cnp->cn_nameptr, cnp->cn_namelen,
|
|
cnp->cn_cred, ap->a_vap->va_mode);
|
|
if (pn == NULL)
|
|
error = ENOSPC;
|
|
else {
|
|
error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn);
|
|
if (error)
|
|
mqfs_destroy(pn);
|
|
else
|
|
pn->mn_data = mq;
|
|
}
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
if (error)
|
|
mqueue_free(mq);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Remove an entry
|
|
*/
|
|
static
|
|
int do_unlink(struct mqfs_node *pn, struct ucred *ucred)
|
|
{
|
|
struct mqfs_node *parent;
|
|
struct mqfs_vdata *vd;
|
|
int error = 0;
|
|
|
|
sx_assert(&pn->mn_info->mi_lock, SX_LOCKED);
|
|
|
|
if (ucred->cr_uid != pn->mn_uid &&
|
|
(error = priv_check_cred(ucred, PRIV_MQ_ADMIN, 0)) != 0)
|
|
error = EACCES;
|
|
else if (!pn->mn_deleted) {
|
|
parent = pn->mn_parent;
|
|
pn->mn_parent = NULL;
|
|
pn->mn_deleted = 1;
|
|
LIST_REMOVE(pn, mn_sibling);
|
|
LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
|
|
cache_purge(vd->mv_vnode);
|
|
vhold(vd->mv_vnode);
|
|
taskqueue_enqueue(taskqueue_thread, &vd->mv_task);
|
|
}
|
|
mqnode_release(pn);
|
|
mqnode_release(parent);
|
|
} else
|
|
error = ENOENT;
|
|
return (error);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_remove_args {
|
|
struct vnode *a_dvp;
|
|
struct vnode *a_vp;
|
|
struct componentname *a_cnp;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* vnode removal operation
|
|
*/
|
|
static int
|
|
mqfs_remove(struct vop_remove_args *ap)
|
|
{
|
|
struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
|
|
struct mqfs_node *pn;
|
|
int error;
|
|
|
|
if (ap->a_vp->v_type == VDIR)
|
|
return (EPERM);
|
|
pn = VTON(ap->a_vp);
|
|
sx_xlock(&mqfs->mi_lock);
|
|
error = do_unlink(pn, ap->a_cnp->cn_cred);
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
return (error);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_inactive_args {
|
|
struct vnode *a_vp;
|
|
struct thread *a_td;
|
|
};
|
|
#endif
|
|
|
|
static int
|
|
mqfs_inactive(struct vop_inactive_args *ap)
|
|
{
|
|
struct mqfs_node *pn = VTON(ap->a_vp);
|
|
|
|
if (pn->mn_deleted)
|
|
vrecycle(ap->a_vp, ap->a_td);
|
|
return (0);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_reclaim_args {
|
|
struct vop_generic_args a_gen;
|
|
struct vnode *a_vp;
|
|
struct thread *a_td;
|
|
};
|
|
#endif
|
|
|
|
static int
|
|
mqfs_reclaim(struct vop_reclaim_args *ap)
|
|
{
|
|
struct mqfs_info *mqfs = VFSTOMQFS(ap->a_vp->v_mount);
|
|
struct vnode *vp = ap->a_vp;
|
|
struct mqfs_node *pn;
|
|
struct mqfs_vdata *vd;
|
|
|
|
vd = vp->v_data;
|
|
pn = vd->mv_node;
|
|
sx_xlock(&mqfs->mi_lock);
|
|
vp->v_data = NULL;
|
|
LIST_REMOVE(vd, mv_link);
|
|
uma_zfree(mvdata_zone, vd);
|
|
mqnode_release(pn);
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
return (0);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_open_args {
|
|
struct vop_generic_args a_gen;
|
|
struct vnode *a_vp;
|
|
int a_mode;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
int a_fdidx;
|
|
};
|
|
#endif
|
|
|
|
static int
|
|
mqfs_open(struct vop_open_args *ap)
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_close_args {
|
|
struct vop_generic_args a_gen;
|
|
struct vnode *a_vp;
|
|
int a_fflag;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
};
|
|
#endif
|
|
|
|
static int
|
|
mqfs_close(struct vop_close_args *ap)
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_access_args {
|
|
struct vop_generic_args a_gen;
|
|
struct vnode *a_vp;
|
|
int a_mode;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* Verify permissions
|
|
*/
|
|
static int
|
|
mqfs_access(struct vop_access_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct vattr vattr;
|
|
int error;
|
|
|
|
error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_td);
|
|
if (error)
|
|
return (error);
|
|
error = vaccess(vp->v_type, vattr.va_mode, vattr.va_uid,
|
|
vattr.va_gid, ap->a_mode, ap->a_cred, NULL);
|
|
return (error);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_getattr_args {
|
|
struct vop_generic_args a_gen;
|
|
struct vnode *a_vp;
|
|
struct vattr *a_vap;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* Get file attributes
|
|
*/
|
|
static int
|
|
mqfs_getattr(struct vop_getattr_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct mqfs_node *pn = VTON(vp);
|
|
struct vattr *vap = ap->a_vap;
|
|
int error = 0;
|
|
|
|
VATTR_NULL(vap);
|
|
vap->va_type = vp->v_type;
|
|
vap->va_mode = pn->mn_mode;
|
|
vap->va_nlink = 1;
|
|
vap->va_uid = pn->mn_uid;
|
|
vap->va_gid = pn->mn_gid;
|
|
vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
|
|
vap->va_fileid = pn->mn_fileno;
|
|
vap->va_size = 0;
|
|
vap->va_blocksize = PAGE_SIZE;
|
|
vap->va_bytes = vap->va_size = 0;
|
|
vap->va_atime = pn->mn_atime;
|
|
vap->va_mtime = pn->mn_mtime;
|
|
vap->va_ctime = pn->mn_ctime;
|
|
vap->va_birthtime = pn->mn_birth;
|
|
vap->va_gen = 0;
|
|
vap->va_flags = 0;
|
|
vap->va_rdev = 0;
|
|
vap->va_bytes = 0;
|
|
vap->va_filerev = 0;
|
|
vap->va_vaflags = 0;
|
|
return (error);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_setattr_args {
|
|
struct vop_generic_args a_gen;
|
|
struct vnode *a_vp;
|
|
struct vattr *a_vap;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
};
|
|
#endif
|
|
/*
|
|
* Set attributes
|
|
*/
|
|
static int
|
|
mqfs_setattr(struct vop_setattr_args *ap)
|
|
{
|
|
struct mqfs_node *pn;
|
|
struct vattr *vap;
|
|
struct vnode *vp;
|
|
int c, error;
|
|
uid_t uid;
|
|
gid_t gid;
|
|
|
|
vap = ap->a_vap;
|
|
vp = ap->a_vp;
|
|
if ((vap->va_type != VNON) ||
|
|
(vap->va_nlink != VNOVAL) ||
|
|
(vap->va_fsid != VNOVAL) ||
|
|
(vap->va_fileid != VNOVAL) ||
|
|
(vap->va_blocksize != VNOVAL) ||
|
|
(vap->va_flags != VNOVAL && vap->va_flags != 0) ||
|
|
(vap->va_rdev != VNOVAL) ||
|
|
((int)vap->va_bytes != VNOVAL) ||
|
|
(vap->va_gen != VNOVAL)) {
|
|
return (EINVAL);
|
|
}
|
|
|
|
pn = VTON(vp);
|
|
|
|
error = c = 0;
|
|
if (vap->va_uid == (uid_t)VNOVAL)
|
|
uid = pn->mn_uid;
|
|
else
|
|
uid = vap->va_uid;
|
|
if (vap->va_gid == (gid_t)VNOVAL)
|
|
gid = pn->mn_gid;
|
|
else
|
|
gid = vap->va_gid;
|
|
|
|
if (uid != pn->mn_uid || gid != pn->mn_gid) {
|
|
/*
|
|
* To modify the ownership of a file, must possess VADMIN
|
|
* for that file.
|
|
*/
|
|
if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, ap->a_td)))
|
|
return (error);
|
|
|
|
/*
|
|
* XXXRW: Why is there a privilege check here: shouldn't the
|
|
* check in VOP_ACCESS() be enough? Also, are the group bits
|
|
* below definitely right?
|
|
*/
|
|
if (((ap->a_cred->cr_uid != pn->mn_uid) || uid != pn->mn_uid ||
|
|
(gid != pn->mn_gid && !groupmember(gid, ap->a_cred))) &&
|
|
(error = priv_check(ap->a_td, PRIV_MQ_ADMIN)) != 0)
|
|
return (error);
|
|
pn->mn_uid = uid;
|
|
pn->mn_gid = gid;
|
|
c = 1;
|
|
}
|
|
|
|
if (vap->va_mode != (mode_t)VNOVAL) {
|
|
if ((ap->a_cred->cr_uid != pn->mn_uid) &&
|
|
(error = priv_check(ap->a_td, PRIV_MQ_ADMIN)))
|
|
return (error);
|
|
pn->mn_mode = vap->va_mode;
|
|
c = 1;
|
|
}
|
|
|
|
if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
|
|
/* See the comment in ufs_vnops::ufs_setattr(). */
|
|
if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, ap->a_td)) &&
|
|
((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
|
|
(error = VOP_ACCESS(vp, VWRITE, ap->a_cred, ap->a_td))))
|
|
return (error);
|
|
if (vap->va_atime.tv_sec != VNOVAL) {
|
|
pn->mn_atime = vap->va_atime;
|
|
}
|
|
if (vap->va_mtime.tv_sec != VNOVAL) {
|
|
pn->mn_mtime = vap->va_mtime;
|
|
}
|
|
c = 1;
|
|
}
|
|
if (c) {
|
|
vfs_timestamp(&pn->mn_ctime);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_read_args {
|
|
struct vop_generic_args a_gen;
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
int a_ioflag;
|
|
struct ucred *a_cred;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* Read from a file
|
|
*/
|
|
static int
|
|
mqfs_read(struct vop_read_args *ap)
|
|
{
|
|
char buf[80];
|
|
struct vnode *vp = ap->a_vp;
|
|
struct uio *uio = ap->a_uio;
|
|
struct mqfs_node *pn;
|
|
struct mqueue *mq;
|
|
int len, error;
|
|
|
|
if (vp->v_type != VREG)
|
|
return (EINVAL);
|
|
|
|
pn = VTON(vp);
|
|
mq = VTOMQ(vp);
|
|
snprintf(buf, sizeof(buf),
|
|
"QSIZE:%-10ld MAXMSG:%-10ld CURMSG:%-10ld MSGSIZE:%-10ld\n",
|
|
mq->mq_totalbytes,
|
|
mq->mq_maxmsg,
|
|
mq->mq_curmsgs,
|
|
mq->mq_msgsize);
|
|
buf[sizeof(buf)-1] = '\0';
|
|
len = strlen(buf);
|
|
error = uiomove_frombuf(buf, len, uio);
|
|
return (error);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_readdir_args {
|
|
struct vop_generic_args a_gen;
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
struct ucred *a_cred;
|
|
int *a_eofflag;
|
|
int *a_ncookies;
|
|
u_long **a_cookies;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* Return directory entries.
|
|
*/
|
|
static int
|
|
mqfs_readdir(struct vop_readdir_args *ap)
|
|
{
|
|
struct vnode *vp;
|
|
struct mqfs_info *mi;
|
|
struct mqfs_node *pd;
|
|
struct mqfs_node *pn;
|
|
struct dirent entry;
|
|
struct uio *uio;
|
|
int *tmp_ncookies = NULL;
|
|
off_t offset;
|
|
int error, i;
|
|
|
|
vp = ap->a_vp;
|
|
mi = VFSTOMQFS(vp->v_mount);
|
|
pd = VTON(vp);
|
|
uio = ap->a_uio;
|
|
|
|
if (vp->v_type != VDIR)
|
|
return (ENOTDIR);
|
|
|
|
if (uio->uio_offset < 0)
|
|
return (EINVAL);
|
|
|
|
if (ap->a_ncookies != NULL) {
|
|
tmp_ncookies = ap->a_ncookies;
|
|
*ap->a_ncookies = 0;
|
|
ap->a_ncookies = NULL;
|
|
}
|
|
|
|
error = 0;
|
|
offset = 0;
|
|
|
|
sx_xlock(&mi->mi_lock);
|
|
|
|
LIST_FOREACH(pn, &pd->mn_children, mn_sibling) {
|
|
entry.d_reclen = sizeof(entry);
|
|
if (!pn->mn_fileno)
|
|
mqfs_fileno_alloc(mi, pn);
|
|
entry.d_fileno = pn->mn_fileno;
|
|
for (i = 0; i < MQFS_NAMELEN - 1 && pn->mn_name[i] != '\0'; ++i)
|
|
entry.d_name[i] = pn->mn_name[i];
|
|
entry.d_name[i] = 0;
|
|
entry.d_namlen = i;
|
|
switch (pn->mn_type) {
|
|
case mqfstype_root:
|
|
case mqfstype_dir:
|
|
case mqfstype_this:
|
|
case mqfstype_parent:
|
|
entry.d_type = DT_DIR;
|
|
break;
|
|
case mqfstype_file:
|
|
entry.d_type = DT_REG;
|
|
break;
|
|
case mqfstype_symlink:
|
|
entry.d_type = DT_LNK;
|
|
break;
|
|
default:
|
|
panic("%s has unexpected node type: %d", pn->mn_name,
|
|
pn->mn_type);
|
|
}
|
|
if (entry.d_reclen > uio->uio_resid)
|
|
break;
|
|
if (offset >= uio->uio_offset) {
|
|
error = vfs_read_dirent(ap, &entry, offset);
|
|
if (error)
|
|
break;
|
|
}
|
|
offset += entry.d_reclen;
|
|
}
|
|
sx_xunlock(&mi->mi_lock);
|
|
|
|
uio->uio_offset = offset;
|
|
|
|
if (tmp_ncookies != NULL)
|
|
ap->a_ncookies = tmp_ncookies;
|
|
|
|
return (error);
|
|
}
|
|
|
|
#ifdef notyet
|
|
|
|
#if 0
|
|
struct vop_mkdir_args {
|
|
struct vnode *a_dvp;
|
|
struvt vnode **a_vpp;
|
|
struvt componentname *a_cnp;
|
|
struct vattr *a_vap;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* Create a directory.
|
|
*/
|
|
static int
|
|
mqfs_mkdir(struct vop_mkdir_args *ap)
|
|
{
|
|
struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
|
|
struct componentname *cnp = ap->a_cnp;
|
|
struct mqfs_node *pd = VTON(ap->a_dvp);
|
|
struct mqfs_node *pn;
|
|
int error;
|
|
|
|
if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir)
|
|
return (ENOTDIR);
|
|
sx_xlock(&mqfs->mi_lock);
|
|
#if 0
|
|
/* named node */
|
|
pn = mqfs_search(pd, cnp->cn_nameptr, cnp->cn_namelen);
|
|
if (pn != NULL) {
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
return (EEXIST);
|
|
}
|
|
#else
|
|
if ((cnp->cn_flags & HASBUF) == 0)
|
|
panic("%s: no name", __func__);
|
|
#endif
|
|
pn = mqfs_create_dir(pd, cnp->cn_nameptr, cnp->cn_namelen,
|
|
ap->a_vap->cn_cred, ap->a_vap->va_mode);
|
|
if (pn == NULL)
|
|
error = ENOSPC;
|
|
else
|
|
error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn);
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
return (error);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_rmdir_args {
|
|
struct vnode *a_dvp;
|
|
struct vnode *a_vp;
|
|
struct componentname *a_cnp;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* Remove a directory.
|
|
*/
|
|
static int
|
|
mqfs_rmdir(struct vop_rmdir_args *ap)
|
|
{
|
|
struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
|
|
struct mqfs_node *pn = VTON(ap->a_vp);
|
|
struct mqfs_node *pt;
|
|
|
|
if (pn->mn_type != mqfstype_dir)
|
|
return (ENOTDIR);
|
|
|
|
sx_xlock(&mqfs->mi_lock);
|
|
if (pn->mn_deleted) {
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
return (ENOENT);
|
|
}
|
|
|
|
pt = LIST_FIRST(&pn->mn_children);
|
|
pt = LIST_NEXT(pt, mn_sibling);
|
|
pt = LIST_NEXT(pt, mn_sibling);
|
|
if (pt != NULL) {
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
return (ENOTEMPTY);
|
|
}
|
|
pt = pn->mn_parent;
|
|
pn->mn_parent = NULL;
|
|
pn->mn_deleted = 1;
|
|
LIST_REMOVE(pn, mn_sibling);
|
|
mqnode_release(pn);
|
|
mqnode_release(pt);
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
cache_purge(ap->a_vp);
|
|
return (0);
|
|
}
|
|
|
|
#endif /* notyet */
|
|
|
|
/*
|
|
* Allocate a message queue
|
|
*/
|
|
static struct mqueue *
|
|
mqueue_alloc(const struct mq_attr *attr)
|
|
{
|
|
struct mqueue *mq;
|
|
|
|
if (curmq >= maxmq)
|
|
return (NULL);
|
|
mq = uma_zalloc(mqueue_zone, M_WAITOK | M_ZERO);
|
|
TAILQ_INIT(&mq->mq_msgq);
|
|
if (attr != NULL) {
|
|
mq->mq_maxmsg = attr->mq_maxmsg;
|
|
mq->mq_msgsize = attr->mq_msgsize;
|
|
} else {
|
|
mq->mq_maxmsg = default_maxmsg;
|
|
mq->mq_msgsize = default_msgsize;
|
|
}
|
|
mtx_init(&mq->mq_mutex, "mqueue", NULL, MTX_DEF);
|
|
knlist_init(&mq->mq_rsel.si_note, &mq->mq_mutex, NULL, NULL, NULL);
|
|
knlist_init(&mq->mq_wsel.si_note, &mq->mq_mutex, NULL, NULL, NULL);
|
|
atomic_add_int(&curmq, 1);
|
|
return (mq);
|
|
}
|
|
|
|
/*
|
|
* Destroy a message queue
|
|
*/
|
|
static void
|
|
mqueue_free(struct mqueue *mq)
|
|
{
|
|
struct mqueue_msg *msg;
|
|
|
|
while ((msg = TAILQ_FIRST(&mq->mq_msgq)) != NULL) {
|
|
TAILQ_REMOVE(&mq->mq_msgq, msg, msg_link);
|
|
FREE(msg, M_MQUEUEDATA);
|
|
}
|
|
|
|
mtx_destroy(&mq->mq_mutex);
|
|
knlist_destroy(&mq->mq_rsel.si_note);
|
|
knlist_destroy(&mq->mq_wsel.si_note);
|
|
uma_zfree(mqueue_zone, mq);
|
|
atomic_add_int(&curmq, -1);
|
|
}
|
|
|
|
/*
|
|
* Load a message from user space
|
|
*/
|
|
static struct mqueue_msg *
|
|
mqueue_loadmsg(const char *msg_ptr, size_t msg_size, int msg_prio)
|
|
{
|
|
struct mqueue_msg *msg;
|
|
size_t len;
|
|
int error;
|
|
|
|
len = sizeof(struct mqueue_msg) + msg_size;
|
|
MALLOC(msg, struct mqueue_msg *, len, M_MQUEUEDATA, M_WAITOK);
|
|
error = copyin(msg_ptr, ((char *)msg) + sizeof(struct mqueue_msg),
|
|
msg_size);
|
|
if (error) {
|
|
FREE(msg, M_MQUEUEDATA);
|
|
msg = NULL;
|
|
} else {
|
|
msg->msg_size = msg_size;
|
|
msg->msg_prio = msg_prio;
|
|
}
|
|
return (msg);
|
|
}
|
|
|
|
/*
|
|
* Save a message to user space
|
|
*/
|
|
static int
|
|
mqueue_savemsg(struct mqueue_msg *msg, char *msg_ptr, int *msg_prio)
|
|
{
|
|
int error;
|
|
|
|
error = copyout(((char *)msg) + sizeof(*msg), msg_ptr,
|
|
msg->msg_size);
|
|
if (error == 0 && msg_prio != NULL)
|
|
error = copyout(&msg->msg_prio, msg_prio, sizeof(int));
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Free a message's memory
|
|
*/
|
|
static __inline void
|
|
mqueue_freemsg(struct mqueue_msg *msg)
|
|
{
|
|
FREE(msg, M_MQUEUEDATA);
|
|
}
|
|
|
|
/*
|
|
* Send a message. if waitok is false, thread will not be
|
|
* blocked if there is no data in queue, otherwise, absolute
|
|
* time will be checked.
|
|
*/
|
|
int
|
|
mqueue_send(struct mqueue *mq, const char *msg_ptr,
|
|
size_t msg_len, unsigned msg_prio, int waitok,
|
|
const struct timespec *abs_timeout)
|
|
{
|
|
struct mqueue_msg *msg;
|
|
struct timespec ets, ts, ts2;
|
|
struct timeval tv;
|
|
int error;
|
|
|
|
if (msg_prio >= MQ_PRIO_MAX)
|
|
return (EINVAL);
|
|
if (msg_len > mq->mq_msgsize)
|
|
return (EMSGSIZE);
|
|
msg = mqueue_loadmsg(msg_ptr, msg_len, msg_prio);
|
|
if (msg == NULL)
|
|
return (EFAULT);
|
|
|
|
/* O_NONBLOCK case */
|
|
if (!waitok) {
|
|
error = _mqueue_send(mq, msg, -1);
|
|
if (error)
|
|
goto bad;
|
|
return (0);
|
|
}
|
|
|
|
/* we allow a null timeout (wait forever) */
|
|
if (abs_timeout == NULL) {
|
|
error = _mqueue_send(mq, msg, 0);
|
|
if (error)
|
|
goto bad;
|
|
return (0);
|
|
}
|
|
|
|
/* send it before checking time */
|
|
error = _mqueue_send(mq, msg, -1);
|
|
if (error == 0)
|
|
return (0);
|
|
|
|
if (error != EAGAIN)
|
|
goto bad;
|
|
|
|
error = copyin(abs_timeout, &ets, sizeof(ets));
|
|
if (error != 0)
|
|
goto bad;
|
|
if (ets.tv_nsec >= 1000000000 || ets.tv_nsec < 0) {
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
for (;;) {
|
|
ts2 = ets;
|
|
getnanotime(&ts);
|
|
timespecsub(&ts2, &ts);
|
|
if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) {
|
|
error = ETIMEDOUT;
|
|
break;
|
|
}
|
|
TIMESPEC_TO_TIMEVAL(&tv, &ts2);
|
|
error = _mqueue_send(mq, msg, tvtohz(&tv));
|
|
if (error != ETIMEDOUT)
|
|
break;
|
|
}
|
|
if (error == 0)
|
|
return (0);
|
|
bad:
|
|
mqueue_freemsg(msg);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Common routine to send a message
|
|
*/
|
|
static int
|
|
_mqueue_send(struct mqueue *mq, struct mqueue_msg *msg, int timo)
|
|
{
|
|
struct mqueue_msg *msg2;
|
|
int error = 0;
|
|
|
|
mtx_lock(&mq->mq_mutex);
|
|
while (mq->mq_curmsgs >= mq->mq_maxmsg && error == 0) {
|
|
if (timo < 0) {
|
|
mtx_unlock(&mq->mq_mutex);
|
|
return (EAGAIN);
|
|
}
|
|
mq->mq_senders++;
|
|
error = msleep(&mq->mq_senders, &mq->mq_mutex,
|
|
PCATCH, "mqsend", timo);
|
|
mq->mq_senders--;
|
|
if (error == EAGAIN)
|
|
error = ETIMEDOUT;
|
|
}
|
|
if (mq->mq_curmsgs >= mq->mq_maxmsg) {
|
|
mtx_unlock(&mq->mq_mutex);
|
|
return (error);
|
|
}
|
|
error = 0;
|
|
if (TAILQ_EMPTY(&mq->mq_msgq)) {
|
|
TAILQ_INSERT_HEAD(&mq->mq_msgq, msg, msg_link);
|
|
} else {
|
|
if (msg->msg_prio <= TAILQ_LAST(&mq->mq_msgq, msgq)->msg_prio) {
|
|
TAILQ_INSERT_TAIL(&mq->mq_msgq, msg, msg_link);
|
|
} else {
|
|
TAILQ_FOREACH(msg2, &mq->mq_msgq, msg_link) {
|
|
if (msg2->msg_prio < msg->msg_prio)
|
|
break;
|
|
}
|
|
TAILQ_INSERT_BEFORE(msg2, msg, msg_link);
|
|
}
|
|
}
|
|
mq->mq_curmsgs++;
|
|
mq->mq_totalbytes += msg->msg_size;
|
|
if (mq->mq_receivers)
|
|
wakeup_one(&mq->mq_receivers);
|
|
else if (mq->mq_notifier != NULL)
|
|
mqueue_send_notification(mq);
|
|
if (mq->mq_flags & MQ_RSEL) {
|
|
mq->mq_flags &= ~MQ_RSEL;
|
|
selwakeup(&mq->mq_rsel);
|
|
}
|
|
KNOTE_LOCKED(&mq->mq_rsel.si_note, 0);
|
|
mtx_unlock(&mq->mq_mutex);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Send realtime a signal to process which registered itself
|
|
* successfully by mq_notify.
|
|
*/
|
|
static void
|
|
mqueue_send_notification(struct mqueue *mq)
|
|
{
|
|
struct mqueue_notifier *nt;
|
|
struct proc *p;
|
|
|
|
mtx_assert(&mq->mq_mutex, MA_OWNED);
|
|
nt = mq->mq_notifier;
|
|
if (nt->nt_sigev.sigev_notify != SIGEV_NONE) {
|
|
p = nt->nt_proc;
|
|
PROC_LOCK(p);
|
|
if (!KSI_ONQ(&nt->nt_ksi))
|
|
psignal_event(p, &nt->nt_sigev, &nt->nt_ksi);
|
|
PROC_UNLOCK(p);
|
|
}
|
|
mq->mq_notifier = NULL;
|
|
}
|
|
|
|
/*
|
|
* Get a message. if waitok is false, thread will not be
|
|
* blocked if there is no data in queue, otherwise, absolute
|
|
* time will be checked.
|
|
*/
|
|
int
|
|
mqueue_receive(struct mqueue *mq, char *msg_ptr,
|
|
size_t msg_len, unsigned *msg_prio, int waitok,
|
|
const struct timespec *abs_timeout)
|
|
{
|
|
struct mqueue_msg *msg;
|
|
struct timespec ets, ts, ts2;
|
|
struct timeval tv;
|
|
int error;
|
|
|
|
if (msg_len < mq->mq_msgsize)
|
|
return (EMSGSIZE);
|
|
|
|
/* O_NONBLOCK case */
|
|
if (!waitok) {
|
|
error = _mqueue_recv(mq, &msg, -1);
|
|
if (error)
|
|
return (error);
|
|
goto received;
|
|
}
|
|
|
|
/* we allow a null timeout (wait forever). */
|
|
if (abs_timeout == NULL) {
|
|
error = _mqueue_recv(mq, &msg, 0);
|
|
if (error)
|
|
return (error);
|
|
goto received;
|
|
}
|
|
|
|
/* try to get a message before checking time */
|
|
error = _mqueue_recv(mq, &msg, -1);
|
|
if (error == 0)
|
|
goto received;
|
|
|
|
if (error != EAGAIN)
|
|
return (error);
|
|
|
|
error = copyin(abs_timeout, &ets, sizeof(ets));
|
|
if (error != 0)
|
|
return (error);
|
|
if (ets.tv_nsec >= 1000000000 || ets.tv_nsec < 0) {
|
|
error = EINVAL;
|
|
return (error);
|
|
}
|
|
|
|
for (;;) {
|
|
ts2 = ets;
|
|
getnanotime(&ts);
|
|
timespecsub(&ts2, &ts);
|
|
if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) {
|
|
error = ETIMEDOUT;
|
|
return (error);
|
|
}
|
|
TIMESPEC_TO_TIMEVAL(&tv, &ts2);
|
|
error = _mqueue_recv(mq, &msg, tvtohz(&tv));
|
|
if (error == 0)
|
|
break;
|
|
if (error != ETIMEDOUT)
|
|
return (error);
|
|
}
|
|
|
|
received:
|
|
error = mqueue_savemsg(msg, msg_ptr, msg_prio);
|
|
if (error == 0) {
|
|
curthread->td_retval[0] = msg->msg_size;
|
|
curthread->td_retval[1] = 0;
|
|
}
|
|
mqueue_freemsg(msg);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Common routine to receive a message
|
|
*/
|
|
static int
|
|
_mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg, int timo)
|
|
{
|
|
int error = 0;
|
|
|
|
mtx_lock(&mq->mq_mutex);
|
|
while ((*msg = TAILQ_FIRST(&mq->mq_msgq)) == NULL && error == 0) {
|
|
if (timo < 0) {
|
|
mtx_unlock(&mq->mq_mutex);
|
|
return (EAGAIN);
|
|
}
|
|
mq->mq_receivers++;
|
|
error = msleep(&mq->mq_receivers, &mq->mq_mutex,
|
|
PCATCH, "mqrecv", timo);
|
|
mq->mq_receivers--;
|
|
if (error == EAGAIN)
|
|
error = ETIMEDOUT;
|
|
}
|
|
if (*msg != NULL) {
|
|
error = 0;
|
|
TAILQ_REMOVE(&mq->mq_msgq, *msg, msg_link);
|
|
mq->mq_curmsgs--;
|
|
mq->mq_totalbytes -= (*msg)->msg_size;
|
|
if (mq->mq_senders)
|
|
wakeup_one(&mq->mq_senders);
|
|
if (mq->mq_flags & MQ_WSEL) {
|
|
mq->mq_flags &= ~MQ_WSEL;
|
|
selwakeup(&mq->mq_wsel);
|
|
}
|
|
KNOTE_LOCKED(&mq->mq_wsel.si_note, 0);
|
|
}
|
|
if (mq->mq_notifier != NULL && mq->mq_receivers == 0 &&
|
|
!TAILQ_EMPTY(&mq->mq_msgq)) {
|
|
mqueue_send_notification(mq);
|
|
}
|
|
mtx_unlock(&mq->mq_mutex);
|
|
return (error);
|
|
}
|
|
|
|
static __inline struct mqueue_notifier *
|
|
notifier_alloc(void)
|
|
{
|
|
return (uma_zalloc(mqnoti_zone, M_WAITOK | M_ZERO));
|
|
}
|
|
|
|
static __inline void
|
|
notifier_free(struct mqueue_notifier *p)
|
|
{
|
|
uma_zfree(mqnoti_zone, p);
|
|
}
|
|
|
|
static struct mqueue_notifier *
|
|
notifier_search(struct proc *p, int fd)
|
|
{
|
|
struct mqueue_notifier *nt;
|
|
|
|
LIST_FOREACH(nt, &p->p_mqnotifier, nt_link) {
|
|
if (nt->nt_ksi.ksi_mqd == fd)
|
|
break;
|
|
}
|
|
return (nt);
|
|
}
|
|
|
|
static __inline void
|
|
notifier_insert(struct proc *p, struct mqueue_notifier *nt)
|
|
{
|
|
LIST_INSERT_HEAD(&p->p_mqnotifier, nt, nt_link);
|
|
}
|
|
|
|
static __inline void
|
|
notifier_delete(struct proc *p, struct mqueue_notifier *nt)
|
|
{
|
|
LIST_REMOVE(nt, nt_link);
|
|
notifier_free(nt);
|
|
}
|
|
|
|
static void
|
|
notifier_remove(struct proc *p, struct mqueue *mq, int fd)
|
|
{
|
|
struct mqueue_notifier *nt;
|
|
|
|
mtx_assert(&mq->mq_mutex, MA_OWNED);
|
|
PROC_LOCK(p);
|
|
nt = notifier_search(p, fd);
|
|
if (nt != NULL) {
|
|
if (mq->mq_notifier == nt)
|
|
mq->mq_notifier = NULL;
|
|
sigqueue_take(&nt->nt_ksi);
|
|
notifier_delete(p, nt);
|
|
}
|
|
PROC_UNLOCK(p);
|
|
}
|
|
|
|
/*
|
|
* Syscall to open a message queue.
|
|
*/
|
|
int
|
|
kmq_open(struct thread *td, struct kmq_open_args *uap)
|
|
{
|
|
char path[MQFS_NAMELEN + 1];
|
|
struct mq_attr attr, *pattr;
|
|
struct mqfs_node *pn;
|
|
struct filedesc *fdp;
|
|
struct file *fp;
|
|
struct mqueue *mq;
|
|
int fd, error, len, flags, cmode;
|
|
|
|
if ((uap->flags & O_ACCMODE) == O_ACCMODE)
|
|
return (EINVAL);
|
|
|
|
fdp = td->td_proc->p_fd;
|
|
flags = FFLAGS(uap->flags);
|
|
cmode = (((uap->mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT);
|
|
mq = NULL;
|
|
if ((flags & O_CREAT) && (uap->attr != NULL)) {
|
|
error = copyin(uap->attr, &attr, sizeof(attr));
|
|
if (error)
|
|
return (error);
|
|
if (attr.mq_maxmsg <= 0 || attr.mq_maxmsg > maxmsg)
|
|
return (EINVAL);
|
|
if (attr.mq_msgsize <= 0 || attr.mq_msgsize > maxmsgsize)
|
|
return (EINVAL);
|
|
pattr = &attr;
|
|
} else
|
|
pattr = NULL;
|
|
|
|
error = copyinstr(uap->path, path, MQFS_NAMELEN + 1, NULL);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* The first character of name must be a slash (/) character
|
|
* and the remaining characters of name cannot include any slash
|
|
* characters.
|
|
*/
|
|
len = strlen(path);
|
|
if (len < 2 || path[0] != '/' || index(path + 1, '/') != NULL)
|
|
return (EINVAL);
|
|
|
|
error = falloc(td, &fp, &fd);
|
|
if (error)
|
|
return (error);
|
|
|
|
sx_xlock(&mqfs_data.mi_lock);
|
|
pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1);
|
|
if (pn == NULL) {
|
|
if (!(flags & O_CREAT)) {
|
|
error = ENOENT;
|
|
} else {
|
|
mq = mqueue_alloc(pattr);
|
|
if (mq == NULL) {
|
|
error = ENFILE;
|
|
} else {
|
|
pn = mqfs_create_file(mqfs_data.mi_root,
|
|
path + 1, len - 1, td->td_ucred,
|
|
cmode);
|
|
if (pn == NULL) {
|
|
error = ENOSPC;
|
|
mqueue_free(mq);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (error == 0) {
|
|
pn->mn_data = mq;
|
|
}
|
|
} else {
|
|
if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) {
|
|
error = EEXIST;
|
|
} else {
|
|
int acc_mode = 0;
|
|
|
|
if (flags & FREAD)
|
|
acc_mode |= VREAD;
|
|
if (flags & FWRITE)
|
|
acc_mode |= VWRITE;
|
|
error = vaccess(VREG, pn->mn_mode, pn->mn_uid,
|
|
pn->mn_gid, acc_mode, td->td_ucred, NULL);
|
|
}
|
|
}
|
|
|
|
if (error) {
|
|
sx_xunlock(&mqfs_data.mi_lock);
|
|
fdclose(fdp, fp, fd, td);
|
|
fdrop(fp, td);
|
|
return (error);
|
|
}
|
|
|
|
mqnode_addref(pn);
|
|
sx_xunlock(&mqfs_data.mi_lock);
|
|
|
|
finit(fp, flags & (FREAD | FWRITE | O_NONBLOCK), DTYPE_MQUEUE, pn,
|
|
&mqueueops);
|
|
|
|
FILEDESC_XLOCK(fdp);
|
|
if (fdp->fd_ofiles[fd] == fp)
|
|
fdp->fd_ofileflags[fd] |= UF_EXCLOSE;
|
|
FILEDESC_XUNLOCK(fdp);
|
|
td->td_retval[0] = fd;
|
|
fdrop(fp, td);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Syscall to unlink a message queue.
|
|
*/
|
|
int
|
|
kmq_unlink(struct thread *td, struct kmq_unlink_args *uap)
|
|
{
|
|
char path[MQFS_NAMELEN+1];
|
|
struct mqfs_node *pn;
|
|
int error, len;
|
|
|
|
error = copyinstr(uap->path, path, MQFS_NAMELEN + 1, NULL);
|
|
if (error)
|
|
return (error);
|
|
|
|
len = strlen(path);
|
|
if (len < 2 || path[0] != '/' || index(path + 1, '/') != NULL)
|
|
return (EINVAL);
|
|
|
|
sx_xlock(&mqfs_data.mi_lock);
|
|
pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1);
|
|
if (pn != NULL)
|
|
error = do_unlink(pn, td->td_ucred);
|
|
else
|
|
error = ENOENT;
|
|
sx_xunlock(&mqfs_data.mi_lock);
|
|
return (error);
|
|
}
|
|
|
|
typedef int (*_fgetf)(struct thread *, int, struct file **);
|
|
|
|
/*
|
|
* Get message queue by giving file slot
|
|
*/
|
|
static int
|
|
_getmq(struct thread *td, int fd, _fgetf func,
|
|
struct file **fpp, struct mqfs_node **ppn, struct mqueue **pmq)
|
|
{
|
|
struct mqfs_node *pn;
|
|
int error;
|
|
|
|
error = func(td, fd, fpp);
|
|
if (error)
|
|
return (error);
|
|
if (&mqueueops != (*fpp)->f_ops) {
|
|
fdrop(*fpp, td);
|
|
return (EBADF);
|
|
}
|
|
pn = (*fpp)->f_data;
|
|
if (ppn)
|
|
*ppn = pn;
|
|
if (pmq)
|
|
*pmq = pn->mn_data;
|
|
return (0);
|
|
}
|
|
|
|
static __inline int
|
|
getmq(struct thread *td, int fd, struct file **fpp, struct mqfs_node **ppn,
|
|
struct mqueue **pmq)
|
|
{
|
|
return _getmq(td, fd, fget, fpp, ppn, pmq);
|
|
}
|
|
|
|
static __inline int
|
|
getmq_read(struct thread *td, int fd, struct file **fpp,
|
|
struct mqfs_node **ppn, struct mqueue **pmq)
|
|
{
|
|
return _getmq(td, fd, fget_read, fpp, ppn, pmq);
|
|
}
|
|
|
|
static __inline int
|
|
getmq_write(struct thread *td, int fd, struct file **fpp,
|
|
struct mqfs_node **ppn, struct mqueue **pmq)
|
|
{
|
|
return _getmq(td, fd, fget_write, fpp, ppn, pmq);
|
|
}
|
|
|
|
int
|
|
kmq_setattr(struct thread *td, struct kmq_setattr_args *uap)
|
|
{
|
|
struct mqueue *mq;
|
|
struct file *fp;
|
|
struct mq_attr attr, oattr;
|
|
u_int oflag, flag;
|
|
int error;
|
|
|
|
if (uap->attr) {
|
|
error = copyin(uap->attr, &attr, sizeof(attr));
|
|
if (error)
|
|
return (error);
|
|
if (attr.mq_flags & ~O_NONBLOCK)
|
|
return (EINVAL);
|
|
}
|
|
error = getmq(td, uap->mqd, &fp, NULL, &mq);
|
|
if (error)
|
|
return (error);
|
|
oattr.mq_maxmsg = mq->mq_maxmsg;
|
|
oattr.mq_msgsize = mq->mq_msgsize;
|
|
oattr.mq_curmsgs = mq->mq_curmsgs;
|
|
if (uap->attr) {
|
|
do {
|
|
oflag = flag = fp->f_flag;
|
|
flag &= ~O_NONBLOCK;
|
|
flag |= (attr.mq_flags & O_NONBLOCK);
|
|
} while (atomic_cmpset_int(&fp->f_flag, oflag, flag) == 0);
|
|
} else
|
|
oflag = fp->f_flag;
|
|
oattr.mq_flags = (O_NONBLOCK & oflag);
|
|
fdrop(fp, td);
|
|
if (uap->oattr)
|
|
error = copyout(&oattr, uap->oattr, sizeof(oattr));
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kmq_timedreceive(struct thread *td, struct kmq_timedreceive_args *uap)
|
|
{
|
|
struct mqueue *mq;
|
|
struct file *fp;
|
|
int error;
|
|
int waitok;
|
|
|
|
error = getmq_read(td, uap->mqd, &fp, NULL, &mq);
|
|
if (error)
|
|
return (error);
|
|
waitok = !(fp->f_flag & O_NONBLOCK);
|
|
error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len,
|
|
uap->msg_prio, waitok, uap->abs_timeout);
|
|
fdrop(fp, td);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kmq_timedsend(struct thread *td, struct kmq_timedsend_args *uap)
|
|
{
|
|
struct mqueue *mq;
|
|
struct file *fp;
|
|
int error, waitok;
|
|
|
|
error = getmq_write(td, uap->mqd, &fp, NULL, &mq);
|
|
if (error)
|
|
return (error);
|
|
waitok = !(fp->f_flag & O_NONBLOCK);
|
|
error = mqueue_send(mq, uap->msg_ptr, uap->msg_len,
|
|
uap->msg_prio, waitok, uap->abs_timeout);
|
|
fdrop(fp, td);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kmq_notify(struct thread *td, struct kmq_notify_args *uap)
|
|
{
|
|
struct sigevent ev;
|
|
struct filedesc *fdp;
|
|
struct proc *p;
|
|
struct mqueue *mq;
|
|
struct file *fp;
|
|
struct mqueue_notifier *nt, *newnt = NULL;
|
|
int error;
|
|
|
|
p = td->td_proc;
|
|
fdp = td->td_proc->p_fd;
|
|
if (uap->sigev) {
|
|
error = copyin(uap->sigev, &ev, sizeof(ev));
|
|
if (error)
|
|
return (error);
|
|
if (ev.sigev_notify != SIGEV_SIGNAL &&
|
|
ev.sigev_notify != SIGEV_THREAD_ID &&
|
|
ev.sigev_notify != SIGEV_NONE)
|
|
return (EINVAL);
|
|
if ((ev.sigev_notify == SIGEV_SIGNAL ||
|
|
ev.sigev_notify == SIGEV_THREAD_ID) &&
|
|
!_SIG_VALID(ev.sigev_signo))
|
|
return (EINVAL);
|
|
}
|
|
error = getmq(td, uap->mqd, &fp, NULL, &mq);
|
|
if (error)
|
|
return (error);
|
|
again:
|
|
FILEDESC_SLOCK(fdp);
|
|
if (fget_locked(fdp, uap->mqd) != fp) {
|
|
FILEDESC_SUNLOCK(fdp);
|
|
error = EBADF;
|
|
goto out;
|
|
}
|
|
mtx_lock(&mq->mq_mutex);
|
|
FILEDESC_SUNLOCK(fdp);
|
|
if (uap->sigev != NULL) {
|
|
if (mq->mq_notifier != NULL) {
|
|
error = EBUSY;
|
|
} else {
|
|
PROC_LOCK(p);
|
|
nt = notifier_search(p, uap->mqd);
|
|
if (nt == NULL) {
|
|
if (newnt == NULL) {
|
|
PROC_UNLOCK(p);
|
|
mtx_unlock(&mq->mq_mutex);
|
|
newnt = notifier_alloc();
|
|
goto again;
|
|
}
|
|
}
|
|
|
|
if (nt != NULL) {
|
|
sigqueue_take(&nt->nt_ksi);
|
|
if (newnt != NULL) {
|
|
notifier_free(newnt);
|
|
newnt = NULL;
|
|
}
|
|
} else {
|
|
nt = newnt;
|
|
newnt = NULL;
|
|
ksiginfo_init(&nt->nt_ksi);
|
|
nt->nt_ksi.ksi_flags |= KSI_INS | KSI_EXT;
|
|
nt->nt_ksi.ksi_code = SI_MESGQ;
|
|
nt->nt_proc = p;
|
|
nt->nt_ksi.ksi_mqd = uap->mqd;
|
|
notifier_insert(p, nt);
|
|
}
|
|
nt->nt_sigev = ev;
|
|
mq->mq_notifier = nt;
|
|
PROC_UNLOCK(p);
|
|
/*
|
|
* if there is no receivers and message queue
|
|
* is not empty, we should send notification
|
|
* as soon as possible.
|
|
*/
|
|
if (mq->mq_receivers == 0 &&
|
|
!TAILQ_EMPTY(&mq->mq_msgq))
|
|
mqueue_send_notification(mq);
|
|
}
|
|
} else {
|
|
notifier_remove(p, mq, uap->mqd);
|
|
}
|
|
mtx_unlock(&mq->mq_mutex);
|
|
|
|
out:
|
|
fdrop(fp, td);
|
|
if (newnt != NULL)
|
|
notifier_free(newnt);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
mqueue_fdclose(struct thread *td, int fd, struct file *fp)
|
|
{
|
|
struct filedesc *fdp;
|
|
struct mqueue *mq;
|
|
|
|
fdp = td->td_proc->p_fd;
|
|
FILEDESC_LOCK_ASSERT(fdp);
|
|
|
|
if (fp->f_ops == &mqueueops) {
|
|
mq = FPTOMQ(fp);
|
|
mtx_lock(&mq->mq_mutex);
|
|
notifier_remove(td->td_proc, mq, fd);
|
|
|
|
/* have to wakeup thread in same process */
|
|
if (mq->mq_flags & MQ_RSEL) {
|
|
mq->mq_flags &= ~MQ_RSEL;
|
|
selwakeup(&mq->mq_rsel);
|
|
}
|
|
if (mq->mq_flags & MQ_WSEL) {
|
|
mq->mq_flags &= ~MQ_WSEL;
|
|
selwakeup(&mq->mq_wsel);
|
|
}
|
|
mtx_unlock(&mq->mq_mutex);
|
|
}
|
|
}
|
|
|
|
static void
|
|
mq_proc_exit(void *arg __unused, struct proc *p)
|
|
{
|
|
struct filedesc *fdp;
|
|
struct file *fp;
|
|
struct mqueue *mq;
|
|
int i;
|
|
|
|
fdp = p->p_fd;
|
|
FILEDESC_SLOCK(fdp);
|
|
for (i = 0; i < fdp->fd_nfiles; ++i) {
|
|
fp = fget_locked(fdp, i);
|
|
if (fp != NULL && fp->f_ops == &mqueueops) {
|
|
mq = FPTOMQ(fp);
|
|
mtx_lock(&mq->mq_mutex);
|
|
notifier_remove(p, FPTOMQ(fp), i);
|
|
mtx_unlock(&mq->mq_mutex);
|
|
}
|
|
}
|
|
FILEDESC_SUNLOCK(fdp);
|
|
KASSERT(LIST_EMPTY(&p->p_mqnotifier), ("mq notifiers left"));
|
|
}
|
|
|
|
static int
|
|
mqf_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
|
|
int flags, struct thread *td)
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
static int
|
|
mqf_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
|
|
int flags, struct thread *td)
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
static int
|
|
mqf_truncate(struct file *fp, off_t length, struct ucred *active_cred,
|
|
struct thread *td)
|
|
{
|
|
|
|
return (EINVAL);
|
|
}
|
|
|
|
static int
|
|
mqf_ioctl(struct file *fp, u_long cmd, void *data,
|
|
struct ucred *active_cred, struct thread *td)
|
|
{
|
|
return (ENOTTY);
|
|
}
|
|
|
|
static int
|
|
mqf_poll(struct file *fp, int events, struct ucred *active_cred,
|
|
struct thread *td)
|
|
{
|
|
struct mqueue *mq = FPTOMQ(fp);
|
|
int revents = 0;
|
|
|
|
mtx_lock(&mq->mq_mutex);
|
|
if (events & (POLLIN | POLLRDNORM)) {
|
|
if (mq->mq_curmsgs) {
|
|
revents |= events & (POLLIN | POLLRDNORM);
|
|
} else {
|
|
mq->mq_flags |= MQ_RSEL;
|
|
selrecord(td, &mq->mq_rsel);
|
|
}
|
|
}
|
|
if (events & POLLOUT) {
|
|
if (mq->mq_curmsgs < mq->mq_maxmsg)
|
|
revents |= POLLOUT;
|
|
else {
|
|
mq->mq_flags |= MQ_WSEL;
|
|
selrecord(td, &mq->mq_wsel);
|
|
}
|
|
}
|
|
mtx_unlock(&mq->mq_mutex);
|
|
return (revents);
|
|
}
|
|
|
|
static int
|
|
mqf_close(struct file *fp, struct thread *td)
|
|
{
|
|
struct mqfs_node *pn;
|
|
|
|
fp->f_ops = &badfileops;
|
|
pn = fp->f_data;
|
|
fp->f_data = NULL;
|
|
sx_xlock(&mqfs_data.mi_lock);
|
|
mqnode_release(pn);
|
|
sx_xunlock(&mqfs_data.mi_lock);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mqf_stat(struct file *fp, struct stat *st, struct ucred *active_cred,
|
|
struct thread *td)
|
|
{
|
|
struct mqfs_node *pn = fp->f_data;
|
|
|
|
bzero(st, sizeof *st);
|
|
st->st_atimespec = pn->mn_atime;
|
|
st->st_mtimespec = pn->mn_mtime;
|
|
st->st_ctimespec = pn->mn_ctime;
|
|
st->st_birthtimespec = pn->mn_birth;
|
|
st->st_uid = pn->mn_uid;
|
|
st->st_gid = pn->mn_gid;
|
|
st->st_mode = S_IFIFO | pn->mn_mode;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mqf_kqfilter(struct file *fp, struct knote *kn)
|
|
{
|
|
struct mqueue *mq = FPTOMQ(fp);
|
|
int error = 0;
|
|
|
|
if (kn->kn_filter == EVFILT_READ) {
|
|
kn->kn_fop = &mq_rfiltops;
|
|
knlist_add(&mq->mq_rsel.si_note, kn, 0);
|
|
} else if (kn->kn_filter == EVFILT_WRITE) {
|
|
kn->kn_fop = &mq_wfiltops;
|
|
knlist_add(&mq->mq_wsel.si_note, kn, 0);
|
|
} else
|
|
error = EINVAL;
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
filt_mqdetach(struct knote *kn)
|
|
{
|
|
struct mqueue *mq = FPTOMQ(kn->kn_fp);
|
|
|
|
if (kn->kn_filter == EVFILT_READ)
|
|
knlist_remove(&mq->mq_rsel.si_note, kn, 0);
|
|
else if (kn->kn_filter == EVFILT_WRITE)
|
|
knlist_remove(&mq->mq_wsel.si_note, kn, 0);
|
|
else
|
|
panic("filt_mqdetach");
|
|
}
|
|
|
|
static int
|
|
filt_mqread(struct knote *kn, long hint)
|
|
{
|
|
struct mqueue *mq = FPTOMQ(kn->kn_fp);
|
|
|
|
mtx_assert(&mq->mq_mutex, MA_OWNED);
|
|
return (mq->mq_curmsgs != 0);
|
|
}
|
|
|
|
static int
|
|
filt_mqwrite(struct knote *kn, long hint)
|
|
{
|
|
struct mqueue *mq = FPTOMQ(kn->kn_fp);
|
|
|
|
mtx_assert(&mq->mq_mutex, MA_OWNED);
|
|
return (mq->mq_curmsgs < mq->mq_maxmsg);
|
|
}
|
|
|
|
static struct fileops mqueueops = {
|
|
.fo_read = mqf_read,
|
|
.fo_write = mqf_write,
|
|
.fo_truncate = mqf_truncate,
|
|
.fo_ioctl = mqf_ioctl,
|
|
.fo_poll = mqf_poll,
|
|
.fo_kqfilter = mqf_kqfilter,
|
|
.fo_stat = mqf_stat,
|
|
.fo_close = mqf_close
|
|
};
|
|
|
|
static struct vop_vector mqfs_vnodeops = {
|
|
.vop_default = &default_vnodeops,
|
|
.vop_access = mqfs_access,
|
|
.vop_cachedlookup = mqfs_lookup,
|
|
.vop_lookup = vfs_cache_lookup,
|
|
.vop_reclaim = mqfs_reclaim,
|
|
.vop_create = mqfs_create,
|
|
.vop_remove = mqfs_remove,
|
|
.vop_inactive = mqfs_inactive,
|
|
.vop_open = mqfs_open,
|
|
.vop_close = mqfs_close,
|
|
.vop_getattr = mqfs_getattr,
|
|
.vop_setattr = mqfs_setattr,
|
|
.vop_read = mqfs_read,
|
|
.vop_write = VOP_EOPNOTSUPP,
|
|
.vop_readdir = mqfs_readdir,
|
|
.vop_mkdir = VOP_EOPNOTSUPP,
|
|
.vop_rmdir = VOP_EOPNOTSUPP
|
|
};
|
|
|
|
static struct vfsops mqfs_vfsops = {
|
|
.vfs_init = mqfs_init,
|
|
.vfs_uninit = mqfs_uninit,
|
|
.vfs_mount = mqfs_mount,
|
|
.vfs_unmount = mqfs_unmount,
|
|
.vfs_root = mqfs_root,
|
|
.vfs_statfs = mqfs_statfs,
|
|
};
|
|
|
|
SYSCALL_MODULE_HELPER(kmq_open);
|
|
SYSCALL_MODULE_HELPER(kmq_setattr);
|
|
SYSCALL_MODULE_HELPER(kmq_timedsend);
|
|
SYSCALL_MODULE_HELPER(kmq_timedreceive);
|
|
SYSCALL_MODULE_HELPER(kmq_notify);
|
|
SYSCALL_MODULE_HELPER(kmq_unlink);
|
|
|
|
VFS_SET(mqfs_vfsops, mqueuefs, VFCF_SYNTHETIC);
|
|
MODULE_VERSION(mqueuefs, 1);
|