e65a4ba18b
kernel to boot from NFS. [1] Note: this is not a full virtualization of nfsclient. It is only does what advertised above and nothing more. Requested by: public demand [1] Tested by: kris, .. MFC after: 5 days
3522 lines
91 KiB
C
3522 lines
91 KiB
C
/*-
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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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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* 4. 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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* @(#)nfs_vnops.c 8.16 (Berkeley) 5/27/95
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* vnode op calls for Sun NFS version 2 and 3
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*/
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#include "opt_inet.h"
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#include "opt_kdtrace.h"
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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/resourcevar.h>
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#include <sys/proc.h>
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#include <sys/mount.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/jail.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/namei.h>
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#include <sys/socket.h>
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#include <sys/vnode.h>
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#include <sys/dirent.h>
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#include <sys/fcntl.h>
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#include <sys/lockf.h>
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <sys/signalvar.h>
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#include <vm/vm.h>
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#include <vm/vm_object.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_object.h>
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#include <fs/fifofs/fifo.h>
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#include <nfs/nfsproto.h>
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#include <nfsclient/nfs.h>
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#include <nfsclient/nfsnode.h>
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#include <nfsclient/nfsmount.h>
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#include <nfsclient/nfs_kdtrace.h>
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#include <nfsclient/nfs_lock.h>
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#include <nfs/xdr_subs.h>
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#include <nfsclient/nfsm_subs.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <machine/stdarg.h>
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#ifdef KDTRACE_HOOKS
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#include <sys/dtrace_bsd.h>
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dtrace_nfsclient_accesscache_flush_probe_func_t
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dtrace_nfsclient_accesscache_flush_done_probe;
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uint32_t nfsclient_accesscache_flush_done_id;
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dtrace_nfsclient_accesscache_get_probe_func_t
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dtrace_nfsclient_accesscache_get_hit_probe,
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dtrace_nfsclient_accesscache_get_miss_probe;
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uint32_t nfsclient_accesscache_get_hit_id;
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uint32_t nfsclient_accesscache_get_miss_id;
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dtrace_nfsclient_accesscache_load_probe_func_t
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dtrace_nfsclient_accesscache_load_done_probe;
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uint32_t nfsclient_accesscache_load_done_id;
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#endif /* !KDTRACE_HOOKS */
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/* Defs */
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#define TRUE 1
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#define FALSE 0
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/*
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* Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these
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* calls are not in getblk() and brelse() so that they would not be necessary
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* here.
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*/
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#ifndef B_VMIO
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#define vfs_busy_pages(bp, f)
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#endif
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static vop_read_t nfsfifo_read;
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static vop_write_t nfsfifo_write;
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static vop_close_t nfsfifo_close;
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static int nfs_flush(struct vnode *, int, int);
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static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *);
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static vop_lookup_t nfs_lookup;
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static vop_create_t nfs_create;
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static vop_mknod_t nfs_mknod;
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static vop_open_t nfs_open;
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static vop_close_t nfs_close;
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static vop_access_t nfs_access;
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static vop_getattr_t nfs_getattr;
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static vop_setattr_t nfs_setattr;
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static vop_read_t nfs_read;
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static vop_fsync_t nfs_fsync;
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static vop_remove_t nfs_remove;
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static vop_link_t nfs_link;
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static vop_rename_t nfs_rename;
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static vop_mkdir_t nfs_mkdir;
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static vop_rmdir_t nfs_rmdir;
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static vop_symlink_t nfs_symlink;
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static vop_readdir_t nfs_readdir;
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static vop_strategy_t nfs_strategy;
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static int nfs_lookitup(struct vnode *, const char *, int,
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struct ucred *, struct thread *, struct nfsnode **);
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static int nfs_sillyrename(struct vnode *, struct vnode *,
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struct componentname *);
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static vop_access_t nfsspec_access;
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static vop_readlink_t nfs_readlink;
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static vop_print_t nfs_print;
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static vop_advlock_t nfs_advlock;
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static vop_advlockasync_t nfs_advlockasync;
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/*
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* Global vfs data structures for nfs
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*/
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struct vop_vector nfs_vnodeops = {
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.vop_default = &default_vnodeops,
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.vop_access = nfs_access,
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.vop_advlock = nfs_advlock,
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.vop_advlockasync = nfs_advlockasync,
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.vop_close = nfs_close,
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.vop_create = nfs_create,
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.vop_fsync = nfs_fsync,
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.vop_getattr = nfs_getattr,
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.vop_getpages = nfs_getpages,
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.vop_putpages = nfs_putpages,
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.vop_inactive = nfs_inactive,
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.vop_link = nfs_link,
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.vop_lookup = nfs_lookup,
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.vop_mkdir = nfs_mkdir,
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.vop_mknod = nfs_mknod,
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.vop_open = nfs_open,
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.vop_print = nfs_print,
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.vop_read = nfs_read,
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.vop_readdir = nfs_readdir,
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.vop_readlink = nfs_readlink,
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.vop_reclaim = nfs_reclaim,
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.vop_remove = nfs_remove,
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.vop_rename = nfs_rename,
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.vop_rmdir = nfs_rmdir,
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.vop_setattr = nfs_setattr,
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.vop_strategy = nfs_strategy,
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.vop_symlink = nfs_symlink,
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.vop_write = nfs_write,
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};
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struct vop_vector nfs_fifoops = {
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.vop_default = &fifo_specops,
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.vop_access = nfsspec_access,
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.vop_close = nfsfifo_close,
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.vop_fsync = nfs_fsync,
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.vop_getattr = nfs_getattr,
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.vop_inactive = nfs_inactive,
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.vop_print = nfs_print,
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.vop_read = nfsfifo_read,
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.vop_reclaim = nfs_reclaim,
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.vop_setattr = nfs_setattr,
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.vop_write = nfsfifo_write,
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};
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static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp,
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struct componentname *cnp, struct vattr *vap);
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static int nfs_removerpc(struct vnode *dvp, const char *name, int namelen,
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struct ucred *cred, struct thread *td);
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static int nfs_renamerpc(struct vnode *fdvp, const char *fnameptr,
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int fnamelen, struct vnode *tdvp,
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const char *tnameptr, int tnamelen,
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struct ucred *cred, struct thread *td);
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static int nfs_renameit(struct vnode *sdvp, struct componentname *scnp,
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struct sillyrename *sp);
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/*
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* Global variables
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*/
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struct mtx nfs_iod_mtx;
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struct proc *nfs_iodwant[NFS_MAXASYNCDAEMON];
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struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON];
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int nfs_numasync = 0;
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vop_advlock_t *nfs_advlock_p = nfs_dolock;
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vop_reclaim_t *nfs_reclaim_p = NULL;
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#define DIRHDSIZ (sizeof (struct dirent) - (MAXNAMLEN + 1))
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SYSCTL_DECL(_vfs_nfs);
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static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO;
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SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW,
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&nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout");
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static int nfs_prime_access_cache = 0;
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SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW,
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&nfs_prime_access_cache, 0,
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"Prime NFS ACCESS cache when fetching attributes");
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static int nfsv3_commit_on_close = 0;
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SYSCTL_INT(_vfs_nfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW,
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&nfsv3_commit_on_close, 0, "write+commit on close, else only write");
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static int nfs_clean_pages_on_close = 1;
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SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW,
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&nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close");
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int nfs_directio_enable = 0;
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SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW,
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&nfs_directio_enable, 0, "Enable NFS directio");
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/*
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* This sysctl allows other processes to mmap a file that has been opened
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* O_DIRECT by a process. In general, having processes mmap the file while
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* Direct IO is in progress can lead to Data Inconsistencies. But, we allow
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* this by default to prevent DoS attacks - to prevent a malicious user from
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* opening up files O_DIRECT preventing other users from mmap'ing these
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* files. "Protected" environments where stricter consistency guarantees are
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* required can disable this knob. The process that opened the file O_DIRECT
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* cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not
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* meaningful.
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*/
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int nfs_directio_allow_mmap = 1;
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SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW,
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&nfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens");
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#if 0
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SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD,
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&nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count");
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SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD,
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&nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count");
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#endif
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#define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY \
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| NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE \
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| NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP)
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/*
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* SMP Locking Note :
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* The list of locks after the description of the lock is the ordering
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* of other locks acquired with the lock held.
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* np->n_mtx : Protects the fields in the nfsnode.
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VM Object Lock
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VI_MTX (acquired indirectly)
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* nmp->nm_mtx : Protects the fields in the nfsmount.
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rep->r_mtx
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* nfs_iod_mtx : Global lock, protects shared nfsiod state.
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* nfs_reqq_mtx : Global lock, protects the nfs_reqq list.
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nmp->nm_mtx
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rep->r_mtx
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* rep->r_mtx : Protects the fields in an nfsreq.
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*/
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static int
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nfs3_access_otw(struct vnode *vp, int wmode, struct thread *td,
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struct ucred *cred, uint32_t *retmode)
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{
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const int v3 = 1;
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u_int32_t *tl;
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int error = 0, attrflag, i, lrupos;
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struct mbuf *mreq, *mrep, *md, *mb;
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caddr_t bpos, dpos;
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u_int32_t rmode;
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struct nfsnode *np = VTONFS(vp);
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nfsstats.rpccnt[NFSPROC_ACCESS]++;
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mreq = nfsm_reqhead(vp, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED);
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mb = mreq;
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bpos = mtod(mb, caddr_t);
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nfsm_fhtom(vp, v3);
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tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
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*tl = txdr_unsigned(wmode);
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nfsm_request(vp, NFSPROC_ACCESS, td, cred);
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nfsm_postop_attr(vp, attrflag);
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if (!error) {
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lrupos = 0;
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tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
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rmode = fxdr_unsigned(u_int32_t, *tl);
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mtx_lock(&np->n_mtx);
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for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
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if (np->n_accesscache[i].uid == cred->cr_uid) {
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np->n_accesscache[i].mode = rmode;
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np->n_accesscache[i].stamp = time_second;
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break;
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}
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if (i > 0 && np->n_accesscache[i].stamp <
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np->n_accesscache[lrupos].stamp)
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lrupos = i;
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}
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if (i == NFS_ACCESSCACHESIZE) {
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np->n_accesscache[lrupos].uid = cred->cr_uid;
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np->n_accesscache[lrupos].mode = rmode;
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np->n_accesscache[lrupos].stamp = time_second;
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}
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mtx_unlock(&np->n_mtx);
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if (retmode != NULL)
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*retmode = rmode;
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KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0);
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}
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m_freem(mrep);
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nfsmout:
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#ifdef KDTRACE_HOOKS
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if (error) {
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KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0,
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error);
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}
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#endif
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return (error);
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}
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/*
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* nfs access vnode op.
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* For nfs version 2, just return ok. File accesses may fail later.
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* For nfs version 3, use the access rpc to check accessibility. If file modes
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* are changed on the server, accesses might still fail later.
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*/
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static int
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nfs_access(struct vop_access_args *ap)
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{
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struct vnode *vp = ap->a_vp;
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int error = 0, i, gotahit;
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u_int32_t mode, rmode, wmode;
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int v3 = NFS_ISV3(vp);
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struct nfsnode *np = VTONFS(vp);
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/*
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* Disallow write attempts on filesystems mounted read-only;
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* unless the file is a socket, fifo, or a block or character
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* device resident on the filesystem.
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*/
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if ((ap->a_accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
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switch (vp->v_type) {
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case VREG:
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case VDIR:
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case VLNK:
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return (EROFS);
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default:
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break;
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}
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}
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/*
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* For nfs v3, check to see if we have done this recently, and if
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* so return our cached result instead of making an ACCESS call.
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* If not, do an access rpc, otherwise you are stuck emulating
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* ufs_access() locally using the vattr. This may not be correct,
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* since the server may apply other access criteria such as
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* client uid-->server uid mapping that we do not know about.
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*/
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if (v3) {
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if (ap->a_accmode & VREAD)
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mode = NFSV3ACCESS_READ;
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else
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mode = 0;
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if (vp->v_type != VDIR) {
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if (ap->a_accmode & VWRITE)
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mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND);
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if (ap->a_accmode & VEXEC)
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mode |= NFSV3ACCESS_EXECUTE;
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} else {
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if (ap->a_accmode & VWRITE)
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mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND |
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NFSV3ACCESS_DELETE);
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if (ap->a_accmode & VEXEC)
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mode |= NFSV3ACCESS_LOOKUP;
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}
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/* XXX safety belt, only make blanket request if caching */
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if (nfsaccess_cache_timeout > 0) {
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wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY |
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NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE |
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NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP;
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} else {
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wmode = mode;
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}
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/*
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* Does our cached result allow us to give a definite yes to
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* this request?
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*/
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gotahit = 0;
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mtx_lock(&np->n_mtx);
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for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
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if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) {
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if (time_second < (np->n_accesscache[i].stamp +
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nfsaccess_cache_timeout) &&
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(np->n_accesscache[i].mode & mode) == mode) {
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nfsstats.accesscache_hits++;
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gotahit = 1;
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}
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break;
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}
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}
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mtx_unlock(&np->n_mtx);
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#ifdef KDTRACE_HOOKS
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if (gotahit)
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KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp,
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ap->a_cred->cr_uid, mode);
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else
|
|
KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp,
|
|
ap->a_cred->cr_uid, mode);
|
|
#endif
|
|
if (gotahit == 0) {
|
|
/*
|
|
* Either a no, or a don't know. Go to the wire.
|
|
*/
|
|
nfsstats.accesscache_misses++;
|
|
error = nfs3_access_otw(vp, wmode, ap->a_td, ap->a_cred,
|
|
&rmode);
|
|
if (!error) {
|
|
if ((rmode & mode) != mode)
|
|
error = EACCES;
|
|
}
|
|
}
|
|
return (error);
|
|
} else {
|
|
if ((error = nfsspec_access(ap)) != 0) {
|
|
return (error);
|
|
}
|
|
/*
|
|
* Attempt to prevent a mapped root from accessing a file
|
|
* which it shouldn't. We try to read a byte from the file
|
|
* if the user is root and the file is not zero length.
|
|
* After calling nfsspec_access, we should have the correct
|
|
* file size cached.
|
|
*/
|
|
mtx_lock(&np->n_mtx);
|
|
if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD)
|
|
&& VTONFS(vp)->n_size > 0) {
|
|
struct iovec aiov;
|
|
struct uio auio;
|
|
char buf[1];
|
|
|
|
mtx_unlock(&np->n_mtx);
|
|
aiov.iov_base = buf;
|
|
aiov.iov_len = 1;
|
|
auio.uio_iov = &aiov;
|
|
auio.uio_iovcnt = 1;
|
|
auio.uio_offset = 0;
|
|
auio.uio_resid = 1;
|
|
auio.uio_segflg = UIO_SYSSPACE;
|
|
auio.uio_rw = UIO_READ;
|
|
auio.uio_td = ap->a_td;
|
|
|
|
if (vp->v_type == VREG)
|
|
error = nfs_readrpc(vp, &auio, ap->a_cred);
|
|
else if (vp->v_type == VDIR) {
|
|
char* bp;
|
|
bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
|
|
aiov.iov_base = bp;
|
|
aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ;
|
|
error = nfs_readdirrpc(vp, &auio, ap->a_cred);
|
|
free(bp, M_TEMP);
|
|
} else if (vp->v_type == VLNK)
|
|
error = nfs_readlinkrpc(vp, &auio, ap->a_cred);
|
|
else
|
|
error = EACCES;
|
|
} else
|
|
mtx_unlock(&np->n_mtx);
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
int nfs_otw_getattr_avoid = 0;
|
|
|
|
/*
|
|
* nfs open vnode op
|
|
* Check to see if the type is ok
|
|
* and that deletion is not in progress.
|
|
* For paged in text files, you will need to flush the page cache
|
|
* if consistency is lost.
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
nfs_open(struct vop_open_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct nfsnode *np = VTONFS(vp);
|
|
struct vattr vattr;
|
|
int error;
|
|
int fmode = ap->a_mode;
|
|
|
|
if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
|
|
return (EOPNOTSUPP);
|
|
|
|
/*
|
|
* Get a valid lease. If cached data is stale, flush it.
|
|
*/
|
|
mtx_lock(&np->n_mtx);
|
|
if (np->n_flag & NMODIFIED) {
|
|
mtx_unlock(&np->n_mtx);
|
|
error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
|
|
if (error == EINTR || error == EIO)
|
|
return (error);
|
|
np->n_attrstamp = 0;
|
|
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
|
|
if (vp->v_type == VDIR)
|
|
np->n_direofoffset = 0;
|
|
error = VOP_GETATTR(vp, &vattr, ap->a_cred);
|
|
if (error)
|
|
return (error);
|
|
mtx_lock(&np->n_mtx);
|
|
np->n_mtime = vattr.va_mtime;
|
|
mtx_unlock(&np->n_mtx);
|
|
} else {
|
|
struct thread *td = curthread;
|
|
|
|
if (np->n_ac_ts_syscalls != td->td_syscalls ||
|
|
np->n_ac_ts_tid != td->td_tid ||
|
|
td->td_proc == NULL ||
|
|
np->n_ac_ts_pid != td->td_proc->p_pid) {
|
|
np->n_attrstamp = 0;
|
|
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
|
|
}
|
|
mtx_unlock(&np->n_mtx);
|
|
error = VOP_GETATTR(vp, &vattr, ap->a_cred);
|
|
if (error)
|
|
return (error);
|
|
mtx_lock(&np->n_mtx);
|
|
if (NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
|
|
if (vp->v_type == VDIR)
|
|
np->n_direofoffset = 0;
|
|
mtx_unlock(&np->n_mtx);
|
|
error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
|
|
if (error == EINTR || error == EIO) {
|
|
return (error);
|
|
}
|
|
mtx_lock(&np->n_mtx);
|
|
np->n_mtime = vattr.va_mtime;
|
|
}
|
|
mtx_unlock(&np->n_mtx);
|
|
}
|
|
/*
|
|
* If the object has >= 1 O_DIRECT active opens, we disable caching.
|
|
*/
|
|
if (nfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
|
|
if (np->n_directio_opens == 0) {
|
|
error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
|
|
if (error)
|
|
return (error);
|
|
mtx_lock(&np->n_mtx);
|
|
np->n_flag |= NNONCACHE;
|
|
mtx_unlock(&np->n_mtx);
|
|
}
|
|
np->n_directio_opens++;
|
|
}
|
|
vnode_create_vobject(vp, vattr.va_size, ap->a_td);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* nfs close vnode op
|
|
* What an NFS client should do upon close after writing is a debatable issue.
|
|
* Most NFS clients push delayed writes to the server upon close, basically for
|
|
* two reasons:
|
|
* 1 - So that any write errors may be reported back to the client process
|
|
* doing the close system call. By far the two most likely errors are
|
|
* NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
|
|
* 2 - To put a worst case upper bound on cache inconsistency between
|
|
* multiple clients for the file.
|
|
* There is also a consistency problem for Version 2 of the protocol w.r.t.
|
|
* not being able to tell if other clients are writing a file concurrently,
|
|
* since there is no way of knowing if the changed modify time in the reply
|
|
* is only due to the write for this client.
|
|
* (NFS Version 3 provides weak cache consistency data in the reply that
|
|
* should be sufficient to detect and handle this case.)
|
|
*
|
|
* The current code does the following:
|
|
* for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
|
|
* for NFS Version 3 - flush dirty buffers to the server but don't invalidate
|
|
* or commit them (this satisfies 1 and 2 except for the
|
|
* case where the server crashes after this close but
|
|
* before the commit RPC, which is felt to be "good
|
|
* enough". Changing the last argument to nfs_flush() to
|
|
* a 1 would force a commit operation, if it is felt a
|
|
* commit is necessary now.
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
nfs_close(struct vop_close_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct nfsnode *np = VTONFS(vp);
|
|
int error = 0;
|
|
int fmode = ap->a_fflag;
|
|
|
|
if (vp->v_type == VREG) {
|
|
/*
|
|
* Examine and clean dirty pages, regardless of NMODIFIED.
|
|
* This closes a major hole in close-to-open consistency.
|
|
* We want to push out all dirty pages (and buffers) on
|
|
* close, regardless of whether they were dirtied by
|
|
* mmap'ed writes or via write().
|
|
*/
|
|
if (nfs_clean_pages_on_close && vp->v_object) {
|
|
VM_OBJECT_LOCK(vp->v_object);
|
|
vm_object_page_clean(vp->v_object, 0, 0, 0);
|
|
VM_OBJECT_UNLOCK(vp->v_object);
|
|
}
|
|
mtx_lock(&np->n_mtx);
|
|
if (np->n_flag & NMODIFIED) {
|
|
mtx_unlock(&np->n_mtx);
|
|
if (NFS_ISV3(vp)) {
|
|
/*
|
|
* Under NFSv3 we have dirty buffers to dispose of. We
|
|
* must flush them to the NFS server. We have the option
|
|
* of waiting all the way through the commit rpc or just
|
|
* waiting for the initial write. The default is to only
|
|
* wait through the initial write so the data is in the
|
|
* server's cache, which is roughly similar to the state
|
|
* a standard disk subsystem leaves the file in on close().
|
|
*
|
|
* We cannot clear the NMODIFIED bit in np->n_flag due to
|
|
* potential races with other processes, and certainly
|
|
* cannot clear it if we don't commit.
|
|
*/
|
|
int cm = nfsv3_commit_on_close ? 1 : 0;
|
|
error = nfs_flush(vp, MNT_WAIT, cm);
|
|
/* np->n_flag &= ~NMODIFIED; */
|
|
} else
|
|
error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
|
|
mtx_lock(&np->n_mtx);
|
|
}
|
|
if (np->n_flag & NWRITEERR) {
|
|
np->n_flag &= ~NWRITEERR;
|
|
error = np->n_error;
|
|
}
|
|
mtx_unlock(&np->n_mtx);
|
|
}
|
|
if (nfs_directio_enable)
|
|
KASSERT((np->n_directio_asyncwr == 0),
|
|
("nfs_close: dirty unflushed (%d) directio buffers\n",
|
|
np->n_directio_asyncwr));
|
|
if (nfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
|
|
mtx_lock(&np->n_mtx);
|
|
KASSERT((np->n_directio_opens > 0),
|
|
("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
|
|
np->n_directio_opens--;
|
|
if (np->n_directio_opens == 0)
|
|
np->n_flag &= ~NNONCACHE;
|
|
mtx_unlock(&np->n_mtx);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* nfs getattr call from vfs.
|
|
*/
|
|
static int
|
|
nfs_getattr(struct vop_getattr_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct nfsnode *np = VTONFS(vp);
|
|
struct thread *td = curthread;
|
|
struct vattr *vap = ap->a_vap;
|
|
struct vattr vattr;
|
|
caddr_t bpos, dpos;
|
|
int error = 0;
|
|
struct mbuf *mreq, *mrep, *md, *mb;
|
|
int v3 = NFS_ISV3(vp);
|
|
|
|
/*
|
|
* Update local times for special files.
|
|
*/
|
|
mtx_lock(&np->n_mtx);
|
|
if (np->n_flag & (NACC | NUPD))
|
|
np->n_flag |= NCHG;
|
|
mtx_unlock(&np->n_mtx);
|
|
/*
|
|
* First look in the cache.
|
|
*/
|
|
if (nfs_getattrcache(vp, &vattr) == 0)
|
|
goto nfsmout;
|
|
if (v3 && nfs_prime_access_cache && nfsaccess_cache_timeout > 0) {
|
|
nfsstats.accesscache_misses++;
|
|
nfs3_access_otw(vp, NFSV3ACCESS_ALL, td, ap->a_cred, NULL);
|
|
if (nfs_getattrcache(vp, &vattr) == 0)
|
|
goto nfsmout;
|
|
}
|
|
nfsstats.rpccnt[NFSPROC_GETATTR]++;
|
|
mreq = nfsm_reqhead(vp, NFSPROC_GETATTR, NFSX_FH(v3));
|
|
mb = mreq;
|
|
bpos = mtod(mb, caddr_t);
|
|
nfsm_fhtom(vp, v3);
|
|
nfsm_request(vp, NFSPROC_GETATTR, td, ap->a_cred);
|
|
if (!error) {
|
|
nfsm_loadattr(vp, &vattr);
|
|
}
|
|
m_freem(mrep);
|
|
nfsmout:
|
|
vap->va_type = vattr.va_type;
|
|
vap->va_mode = vattr.va_mode;
|
|
vap->va_nlink = vattr.va_nlink;
|
|
vap->va_uid = vattr.va_uid;
|
|
vap->va_gid = vattr.va_gid;
|
|
vap->va_fsid = vattr.va_fsid;
|
|
vap->va_fileid = vattr.va_fileid;
|
|
vap->va_size = vattr.va_size;
|
|
vap->va_blocksize = vattr.va_blocksize;
|
|
vap->va_atime = vattr.va_atime;
|
|
vap->va_mtime = vattr.va_mtime;
|
|
vap->va_ctime = vattr.va_ctime;
|
|
vap->va_gen = vattr.va_gen;
|
|
vap->va_flags = vattr.va_flags;
|
|
vap->va_rdev = vattr.va_rdev;
|
|
vap->va_bytes = vattr.va_bytes;
|
|
vap->va_filerev = vattr.va_filerev;
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* nfs setattr call.
|
|
*/
|
|
static int
|
|
nfs_setattr(struct vop_setattr_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct nfsnode *np = VTONFS(vp);
|
|
struct vattr *vap = ap->a_vap;
|
|
struct thread *td = curthread;
|
|
int error = 0;
|
|
u_quad_t tsize;
|
|
|
|
#ifndef nolint
|
|
tsize = (u_quad_t)0;
|
|
#endif
|
|
|
|
/*
|
|
* Setting of flags is not supported.
|
|
*/
|
|
if (vap->va_flags != VNOVAL)
|
|
return (EOPNOTSUPP);
|
|
|
|
/*
|
|
* Disallow write attempts if the filesystem is mounted read-only.
|
|
*/
|
|
if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
|
|
vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
|
|
vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
|
|
(vp->v_mount->mnt_flag & MNT_RDONLY)) {
|
|
error = EROFS;
|
|
goto out;
|
|
}
|
|
if (vap->va_size != VNOVAL) {
|
|
switch (vp->v_type) {
|
|
case VDIR:
|
|
return (EISDIR);
|
|
case VCHR:
|
|
case VBLK:
|
|
case VSOCK:
|
|
case VFIFO:
|
|
if (vap->va_mtime.tv_sec == VNOVAL &&
|
|
vap->va_atime.tv_sec == VNOVAL &&
|
|
vap->va_mode == (mode_t)VNOVAL &&
|
|
vap->va_uid == (uid_t)VNOVAL &&
|
|
vap->va_gid == (gid_t)VNOVAL)
|
|
return (0);
|
|
vap->va_size = VNOVAL;
|
|
break;
|
|
default:
|
|
/*
|
|
* Disallow write attempts if the filesystem is
|
|
* mounted read-only.
|
|
*/
|
|
if (vp->v_mount->mnt_flag & MNT_RDONLY)
|
|
return (EROFS);
|
|
/*
|
|
* We run vnode_pager_setsize() early (why?),
|
|
* we must set np->n_size now to avoid vinvalbuf
|
|
* V_SAVE races that might setsize a lower
|
|
* value.
|
|
*/
|
|
mtx_lock(&np->n_mtx);
|
|
tsize = np->n_size;
|
|
mtx_unlock(&np->n_mtx);
|
|
error = nfs_meta_setsize(vp, ap->a_cred, td,
|
|
vap->va_size);
|
|
mtx_lock(&np->n_mtx);
|
|
if (np->n_flag & NMODIFIED) {
|
|
tsize = np->n_size;
|
|
mtx_unlock(&np->n_mtx);
|
|
if (vap->va_size == 0)
|
|
error = nfs_vinvalbuf(vp, 0, td, 1);
|
|
else
|
|
error = nfs_vinvalbuf(vp, V_SAVE, td, 1);
|
|
if (error) {
|
|
vnode_pager_setsize(vp, tsize);
|
|
goto out;
|
|
}
|
|
} else
|
|
mtx_unlock(&np->n_mtx);
|
|
/*
|
|
* np->n_size has already been set to vap->va_size
|
|
* in nfs_meta_setsize(). We must set it again since
|
|
* nfs_loadattrcache() could be called through
|
|
* nfs_meta_setsize() and could modify np->n_size.
|
|
*/
|
|
mtx_lock(&np->n_mtx);
|
|
np->n_vattr.va_size = np->n_size = vap->va_size;
|
|
mtx_unlock(&np->n_mtx);
|
|
};
|
|
} else {
|
|
mtx_lock(&np->n_mtx);
|
|
if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) &&
|
|
(np->n_flag & NMODIFIED) && vp->v_type == VREG) {
|
|
mtx_unlock(&np->n_mtx);
|
|
if ((error = nfs_vinvalbuf(vp, V_SAVE, td, 1)) != 0 &&
|
|
(error == EINTR || error == EIO))
|
|
return error;
|
|
} else
|
|
mtx_unlock(&np->n_mtx);
|
|
}
|
|
error = nfs_setattrrpc(vp, vap, ap->a_cred);
|
|
if (error && vap->va_size != VNOVAL) {
|
|
mtx_lock(&np->n_mtx);
|
|
np->n_size = np->n_vattr.va_size = tsize;
|
|
vnode_pager_setsize(vp, tsize);
|
|
mtx_unlock(&np->n_mtx);
|
|
}
|
|
out:
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Do an nfs setattr rpc.
|
|
*/
|
|
static int
|
|
nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred)
|
|
{
|
|
struct nfsv2_sattr *sp;
|
|
struct nfsnode *np = VTONFS(vp);
|
|
caddr_t bpos, dpos;
|
|
u_int32_t *tl;
|
|
int error = 0, i, wccflag = NFSV3_WCCRATTR;
|
|
struct mbuf *mreq, *mrep, *md, *mb;
|
|
int v3 = NFS_ISV3(vp);
|
|
|
|
nfsstats.rpccnt[NFSPROC_SETATTR]++;
|
|
mreq = nfsm_reqhead(vp, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3));
|
|
mb = mreq;
|
|
bpos = mtod(mb, caddr_t);
|
|
nfsm_fhtom(vp, v3);
|
|
if (v3) {
|
|
nfsm_v3attrbuild(vap, TRUE);
|
|
tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
|
|
*tl = nfs_false;
|
|
} else {
|
|
sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
|
|
if (vap->va_mode == (mode_t)VNOVAL)
|
|
sp->sa_mode = nfs_xdrneg1;
|
|
else
|
|
sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode);
|
|
if (vap->va_uid == (uid_t)VNOVAL)
|
|
sp->sa_uid = nfs_xdrneg1;
|
|
else
|
|
sp->sa_uid = txdr_unsigned(vap->va_uid);
|
|
if (vap->va_gid == (gid_t)VNOVAL)
|
|
sp->sa_gid = nfs_xdrneg1;
|
|
else
|
|
sp->sa_gid = txdr_unsigned(vap->va_gid);
|
|
sp->sa_size = txdr_unsigned(vap->va_size);
|
|
txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
|
|
txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
|
|
}
|
|
nfsm_request(vp, NFSPROC_SETATTR, curthread, cred);
|
|
if (v3) {
|
|
mtx_lock(&np->n_mtx);
|
|
for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
|
|
np->n_accesscache[i].stamp = 0;
|
|
mtx_unlock(&np->n_mtx);
|
|
KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
|
|
nfsm_wcc_data(vp, wccflag);
|
|
} else
|
|
nfsm_loadattr(vp, NULL);
|
|
m_freem(mrep);
|
|
nfsmout:
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* nfs lookup call, one step at a time...
|
|
* First look in cache
|
|
* If not found, unlock the directory nfsnode and do the rpc
|
|
*/
|
|
static int
|
|
nfs_lookup(struct vop_lookup_args *ap)
|
|
{
|
|
struct componentname *cnp = ap->a_cnp;
|
|
struct vnode *dvp = ap->a_dvp;
|
|
struct vnode **vpp = ap->a_vpp;
|
|
struct mount *mp = dvp->v_mount;
|
|
struct vattr vattr;
|
|
time_t dmtime;
|
|
int flags = cnp->cn_flags;
|
|
struct vnode *newvp;
|
|
struct nfsmount *nmp;
|
|
caddr_t bpos, dpos;
|
|
struct mbuf *mreq, *mrep, *md, *mb;
|
|
long len;
|
|
nfsfh_t *fhp;
|
|
struct nfsnode *np;
|
|
int error = 0, attrflag, fhsize, ltype;
|
|
int v3 = NFS_ISV3(dvp);
|
|
struct thread *td = cnp->cn_thread;
|
|
|
|
*vpp = NULLVP;
|
|
if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) &&
|
|
(cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
|
|
return (EROFS);
|
|
if (dvp->v_type != VDIR)
|
|
return (ENOTDIR);
|
|
nmp = VFSTONFS(mp);
|
|
np = VTONFS(dvp);
|
|
if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) {
|
|
*vpp = NULLVP;
|
|
return (error);
|
|
}
|
|
error = cache_lookup(dvp, vpp, cnp);
|
|
if (error > 0 && error != ENOENT)
|
|
return (error);
|
|
if (error == -1) {
|
|
/*
|
|
* We only accept a positive hit in the cache if the
|
|
* change time of the file matches our cached copy.
|
|
* Otherwise, we discard the cache entry and fallback
|
|
* to doing a lookup RPC.
|
|
*/
|
|
newvp = *vpp;
|
|
if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred)
|
|
&& vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) {
|
|
nfsstats.lookupcache_hits++;
|
|
if (cnp->cn_nameiop != LOOKUP &&
|
|
(flags & ISLASTCN))
|
|
cnp->cn_flags |= SAVENAME;
|
|
return (0);
|
|
}
|
|
cache_purge(newvp);
|
|
if (dvp != newvp)
|
|
vput(newvp);
|
|
else
|
|
vrele(newvp);
|
|
*vpp = NULLVP;
|
|
} else if (error == ENOENT) {
|
|
if (dvp->v_iflag & VI_DOOMED)
|
|
return (ENOENT);
|
|
/*
|
|
* We only accept a negative hit in the cache if the
|
|
* modification time of the parent directory matches
|
|
* our cached copy. Otherwise, we discard all of the
|
|
* negative cache entries for this directory.
|
|
*/
|
|
if (VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 &&
|
|
vattr.va_mtime.tv_sec == np->n_dmtime) {
|
|
nfsstats.lookupcache_hits++;
|
|
return (ENOENT);
|
|
}
|
|
cache_purge_negative(dvp);
|
|
mtx_lock(&np->n_mtx);
|
|
np->n_dmtime = 0;
|
|
mtx_unlock(&np->n_mtx);
|
|
}
|
|
|
|
/*
|
|
* Cache the modification time of the parent directory in case
|
|
* the lookup fails and results in adding the first negative
|
|
* name cache entry for the directory. Since this is reading
|
|
* a single time_t, don't bother with locking. The
|
|
* modification time may be a bit stale, but it must be read
|
|
* before performing the lookup RPC to prevent a race where
|
|
* another lookup updates the timestamp on the directory after
|
|
* the lookup RPC has been performed on the server but before
|
|
* n_dmtime is set at the end of this function.
|
|
*/
|
|
dmtime = np->n_vattr.va_mtime.tv_sec;
|
|
error = 0;
|
|
newvp = NULLVP;
|
|
nfsstats.lookupcache_misses++;
|
|
nfsstats.rpccnt[NFSPROC_LOOKUP]++;
|
|
len = cnp->cn_namelen;
|
|
mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP,
|
|
NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len));
|
|
mb = mreq;
|
|
bpos = mtod(mb, caddr_t);
|
|
nfsm_fhtom(dvp, v3);
|
|
nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN);
|
|
nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_thread, cnp->cn_cred);
|
|
if (error) {
|
|
if (v3) {
|
|
nfsm_postop_attr(dvp, attrflag);
|
|
m_freem(mrep);
|
|
}
|
|
goto nfsmout;
|
|
}
|
|
nfsm_getfh(fhp, fhsize, v3);
|
|
|
|
/*
|
|
* Handle RENAME case...
|
|
*/
|
|
if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
|
|
if (NFS_CMPFH(np, fhp, fhsize)) {
|
|
m_freem(mrep);
|
|
return (EISDIR);
|
|
}
|
|
error = nfs_nget(mp, fhp, fhsize, &np, LK_EXCLUSIVE);
|
|
if (error) {
|
|
m_freem(mrep);
|
|
return (error);
|
|
}
|
|
newvp = NFSTOV(np);
|
|
if (v3) {
|
|
nfsm_postop_attr(newvp, attrflag);
|
|
nfsm_postop_attr(dvp, attrflag);
|
|
} else
|
|
nfsm_loadattr(newvp, NULL);
|
|
*vpp = newvp;
|
|
m_freem(mrep);
|
|
cnp->cn_flags |= SAVENAME;
|
|
return (0);
|
|
}
|
|
|
|
if (flags & ISDOTDOT) {
|
|
ltype = VOP_ISLOCKED(dvp);
|
|
error = vfs_busy(mp, MBF_NOWAIT);
|
|
if (error != 0) {
|
|
vfs_ref(mp);
|
|
VOP_UNLOCK(dvp, 0);
|
|
error = vfs_busy(mp, 0);
|
|
vn_lock(dvp, ltype | LK_RETRY);
|
|
vfs_rel(mp);
|
|
if (error == 0 && (dvp->v_iflag & VI_DOOMED)) {
|
|
vfs_unbusy(mp);
|
|
error = ENOENT;
|
|
}
|
|
if (error != 0) {
|
|
m_freem(mrep);
|
|
return (error);
|
|
}
|
|
}
|
|
VOP_UNLOCK(dvp, 0);
|
|
error = nfs_nget(mp, fhp, fhsize, &np, cnp->cn_lkflags);
|
|
if (error == 0)
|
|
newvp = NFSTOV(np);
|
|
vfs_unbusy(mp);
|
|
if (newvp != dvp)
|
|
vn_lock(dvp, ltype | LK_RETRY);
|
|
if (dvp->v_iflag & VI_DOOMED) {
|
|
if (error == 0) {
|
|
if (newvp == dvp)
|
|
vrele(newvp);
|
|
else
|
|
vput(newvp);
|
|
}
|
|
error = ENOENT;
|
|
}
|
|
if (error) {
|
|
m_freem(mrep);
|
|
return (error);
|
|
}
|
|
} else if (NFS_CMPFH(np, fhp, fhsize)) {
|
|
VREF(dvp);
|
|
newvp = dvp;
|
|
} else {
|
|
error = nfs_nget(mp, fhp, fhsize, &np, cnp->cn_lkflags);
|
|
if (error) {
|
|
m_freem(mrep);
|
|
return (error);
|
|
}
|
|
newvp = NFSTOV(np);
|
|
}
|
|
if (v3) {
|
|
nfsm_postop_attr(newvp, attrflag);
|
|
nfsm_postop_attr(dvp, attrflag);
|
|
} else
|
|
nfsm_loadattr(newvp, NULL);
|
|
if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
|
|
cnp->cn_flags |= SAVENAME;
|
|
if ((cnp->cn_flags & MAKEENTRY) &&
|
|
(cnp->cn_nameiop != DELETE || !(flags & ISLASTCN))) {
|
|
np->n_ctime = np->n_vattr.va_ctime.tv_sec;
|
|
cache_enter(dvp, newvp, cnp);
|
|
}
|
|
*vpp = newvp;
|
|
m_freem(mrep);
|
|
nfsmout:
|
|
if (error) {
|
|
if (newvp != NULLVP) {
|
|
vput(newvp);
|
|
*vpp = NULLVP;
|
|
}
|
|
|
|
if (error != ENOENT)
|
|
goto done;
|
|
|
|
/* The requested file was not found. */
|
|
if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
|
|
(flags & ISLASTCN)) {
|
|
/*
|
|
* XXX: UFS does a full VOP_ACCESS(dvp,
|
|
* VWRITE) here instead of just checking
|
|
* MNT_RDONLY.
|
|
*/
|
|
if (mp->mnt_flag & MNT_RDONLY)
|
|
return (EROFS);
|
|
cnp->cn_flags |= SAVENAME;
|
|
return (EJUSTRETURN);
|
|
}
|
|
|
|
if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) {
|
|
/*
|
|
* Maintain n_dmtime as the modification time
|
|
* of the parent directory when the oldest -ve
|
|
* name cache entry for this directory was
|
|
* added. If a -ve cache entry has already
|
|
* been added with a newer modification time
|
|
* by a concurrent lookup, then don't bother
|
|
* adding a cache entry. The modification
|
|
* time of the directory might have changed
|
|
* due to the file this lookup failed to find
|
|
* being created. In that case a subsequent
|
|
* lookup would incorrectly use the entry
|
|
* added here instead of doing an extra
|
|
* lookup.
|
|
*/
|
|
mtx_lock(&np->n_mtx);
|
|
if (np->n_dmtime <= dmtime) {
|
|
if (np->n_dmtime == 0)
|
|
np->n_dmtime = dmtime;
|
|
mtx_unlock(&np->n_mtx);
|
|
cache_enter(dvp, NULL, cnp);
|
|
} else
|
|
mtx_unlock(&np->n_mtx);
|
|
}
|
|
return (ENOENT);
|
|
}
|
|
done:
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* nfs read call.
|
|
* Just call nfs_bioread() to do the work.
|
|
*/
|
|
static int
|
|
nfs_read(struct vop_read_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
switch (vp->v_type) {
|
|
case VREG:
|
|
return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
|
|
case VDIR:
|
|
return (EISDIR);
|
|
default:
|
|
return (EOPNOTSUPP);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* nfs readlink call
|
|
*/
|
|
static int
|
|
nfs_readlink(struct vop_readlink_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
if (vp->v_type != VLNK)
|
|
return (EINVAL);
|
|
return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred));
|
|
}
|
|
|
|
/*
|
|
* Do a readlink rpc.
|
|
* Called by nfs_doio() from below the buffer cache.
|
|
*/
|
|
int
|
|
nfs_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
|
|
{
|
|
caddr_t bpos, dpos;
|
|
int error = 0, len, attrflag;
|
|
struct mbuf *mreq, *mrep, *md, *mb;
|
|
int v3 = NFS_ISV3(vp);
|
|
|
|
nfsstats.rpccnt[NFSPROC_READLINK]++;
|
|
mreq = nfsm_reqhead(vp, NFSPROC_READLINK, NFSX_FH(v3));
|
|
mb = mreq;
|
|
bpos = mtod(mb, caddr_t);
|
|
nfsm_fhtom(vp, v3);
|
|
nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, cred);
|
|
if (v3)
|
|
nfsm_postop_attr(vp, attrflag);
|
|
if (!error) {
|
|
nfsm_strsiz(len, NFS_MAXPATHLEN);
|
|
if (len == NFS_MAXPATHLEN) {
|
|
struct nfsnode *np = VTONFS(vp);
|
|
mtx_lock(&np->n_mtx);
|
|
if (np->n_size && np->n_size < NFS_MAXPATHLEN)
|
|
len = np->n_size;
|
|
mtx_unlock(&np->n_mtx);
|
|
}
|
|
nfsm_mtouio(uiop, len);
|
|
}
|
|
m_freem(mrep);
|
|
nfsmout:
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* nfs read rpc call
|
|
* Ditto above
|
|
*/
|
|
int
|
|
nfs_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
|
|
{
|
|
u_int32_t *tl;
|
|
caddr_t bpos, dpos;
|
|
struct mbuf *mreq, *mrep, *md, *mb;
|
|
struct nfsmount *nmp;
|
|
int error = 0, len, retlen, tsiz, eof, attrflag;
|
|
int v3 = NFS_ISV3(vp);
|
|
int rsize;
|
|
|
|
#ifndef nolint
|
|
eof = 0;
|
|
#endif
|
|
nmp = VFSTONFS(vp->v_mount);
|
|
tsiz = uiop->uio_resid;
|
|
mtx_lock(&nmp->nm_mtx);
|
|
if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) {
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
return (EFBIG);
|
|
}
|
|
rsize = nmp->nm_rsize;
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
while (tsiz > 0) {
|
|
nfsstats.rpccnt[NFSPROC_READ]++;
|
|
len = (tsiz > rsize) ? rsize : tsiz;
|
|
mreq = nfsm_reqhead(vp, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3);
|
|
mb = mreq;
|
|
bpos = mtod(mb, caddr_t);
|
|
nfsm_fhtom(vp, v3);
|
|
tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED * 3);
|
|
if (v3) {
|
|
txdr_hyper(uiop->uio_offset, tl);
|
|
*(tl + 2) = txdr_unsigned(len);
|
|
} else {
|
|
*tl++ = txdr_unsigned(uiop->uio_offset);
|
|
*tl++ = txdr_unsigned(len);
|
|
*tl = 0;
|
|
}
|
|
nfsm_request(vp, NFSPROC_READ, uiop->uio_td, cred);
|
|
if (v3) {
|
|
nfsm_postop_attr(vp, attrflag);
|
|
if (error) {
|
|
m_freem(mrep);
|
|
goto nfsmout;
|
|
}
|
|
tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED);
|
|
eof = fxdr_unsigned(int, *(tl + 1));
|
|
} else {
|
|
nfsm_loadattr(vp, NULL);
|
|
}
|
|
nfsm_strsiz(retlen, rsize);
|
|
nfsm_mtouio(uiop, retlen);
|
|
m_freem(mrep);
|
|
tsiz -= retlen;
|
|
if (v3) {
|
|
if (eof || retlen == 0) {
|
|
tsiz = 0;
|
|
}
|
|
} else if (retlen < len) {
|
|
tsiz = 0;
|
|
}
|
|
}
|
|
nfsmout:
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* nfs write call
|
|
*/
|
|
int
|
|
nfs_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
|
|
int *iomode, int *must_commit)
|
|
{
|
|
u_int32_t *tl;
|
|
int32_t backup;
|
|
caddr_t bpos, dpos;
|
|
struct mbuf *mreq, *mrep, *md, *mb;
|
|
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
|
|
int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit;
|
|
int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC;
|
|
int wsize;
|
|
|
|
#ifndef DIAGNOSTIC
|
|
if (uiop->uio_iovcnt != 1)
|
|
panic("nfs: writerpc iovcnt > 1");
|
|
#endif
|
|
*must_commit = 0;
|
|
tsiz = uiop->uio_resid;
|
|
mtx_lock(&nmp->nm_mtx);
|
|
if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) {
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
return (EFBIG);
|
|
}
|
|
wsize = nmp->nm_wsize;
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
while (tsiz > 0) {
|
|
nfsstats.rpccnt[NFSPROC_WRITE]++;
|
|
len = (tsiz > wsize) ? wsize : tsiz;
|
|
mreq = nfsm_reqhead(vp, NFSPROC_WRITE,
|
|
NFSX_FH(v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len));
|
|
mb = mreq;
|
|
bpos = mtod(mb, caddr_t);
|
|
nfsm_fhtom(vp, v3);
|
|
if (v3) {
|
|
tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED);
|
|
txdr_hyper(uiop->uio_offset, tl);
|
|
tl += 2;
|
|
*tl++ = txdr_unsigned(len);
|
|
*tl++ = txdr_unsigned(*iomode);
|
|
*tl = txdr_unsigned(len);
|
|
} else {
|
|
u_int32_t x;
|
|
|
|
tl = nfsm_build(u_int32_t *, 4 * NFSX_UNSIGNED);
|
|
/* Set both "begin" and "current" to non-garbage. */
|
|
x = txdr_unsigned((u_int32_t)uiop->uio_offset);
|
|
*tl++ = x; /* "begin offset" */
|
|
*tl++ = x; /* "current offset" */
|
|
x = txdr_unsigned(len);
|
|
*tl++ = x; /* total to this offset */
|
|
*tl = x; /* size of this write */
|
|
}
|
|
nfsm_uiotom(uiop, len);
|
|
nfsm_request(vp, NFSPROC_WRITE, uiop->uio_td, cred);
|
|
if (v3) {
|
|
wccflag = NFSV3_WCCCHK;
|
|
nfsm_wcc_data(vp, wccflag);
|
|
if (!error) {
|
|
tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED
|
|
+ NFSX_V3WRITEVERF);
|
|
rlen = fxdr_unsigned(int, *tl++);
|
|
if (rlen == 0) {
|
|
error = NFSERR_IO;
|
|
m_freem(mrep);
|
|
break;
|
|
} else if (rlen < len) {
|
|
backup = len - rlen;
|
|
uiop->uio_iov->iov_base =
|
|
(char *)uiop->uio_iov->iov_base -
|
|
backup;
|
|
uiop->uio_iov->iov_len += backup;
|
|
uiop->uio_offset -= backup;
|
|
uiop->uio_resid += backup;
|
|
len = rlen;
|
|
}
|
|
commit = fxdr_unsigned(int, *tl++);
|
|
|
|
/*
|
|
* Return the lowest committment level
|
|
* obtained by any of the RPCs.
|
|
*/
|
|
if (committed == NFSV3WRITE_FILESYNC)
|
|
committed = commit;
|
|
else if (committed == NFSV3WRITE_DATASYNC &&
|
|
commit == NFSV3WRITE_UNSTABLE)
|
|
committed = commit;
|
|
mtx_lock(&nmp->nm_mtx);
|
|
if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){
|
|
bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf,
|
|
NFSX_V3WRITEVERF);
|
|
nmp->nm_state |= NFSSTA_HASWRITEVERF;
|
|
} else if (bcmp((caddr_t)tl,
|
|
(caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) {
|
|
*must_commit = 1;
|
|
bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf,
|
|
NFSX_V3WRITEVERF);
|
|
}
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
}
|
|
} else {
|
|
nfsm_loadattr(vp, NULL);
|
|
}
|
|
if (wccflag) {
|
|
mtx_lock(&(VTONFS(vp))->n_mtx);
|
|
VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime;
|
|
mtx_unlock(&(VTONFS(vp))->n_mtx);
|
|
}
|
|
m_freem(mrep);
|
|
if (error)
|
|
break;
|
|
tsiz -= len;
|
|
}
|
|
nfsmout:
|
|
if (vp->v_mount->mnt_kern_flag & MNTK_ASYNC)
|
|
committed = NFSV3WRITE_FILESYNC;
|
|
*iomode = committed;
|
|
if (error)
|
|
uiop->uio_resid = tsiz;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* nfs mknod rpc
|
|
* For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
|
|
* mode set to specify the file type and the size field for rdev.
|
|
*/
|
|
static int
|
|
nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
|
|
struct vattr *vap)
|
|
{
|
|
struct nfsv2_sattr *sp;
|
|
u_int32_t *tl;
|
|
struct vnode *newvp = NULL;
|
|
struct nfsnode *np = NULL;
|
|
struct vattr vattr;
|
|
caddr_t bpos, dpos;
|
|
int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0;
|
|
struct mbuf *mreq, *mrep, *md, *mb;
|
|
u_int32_t rdev;
|
|
int v3 = NFS_ISV3(dvp);
|
|
|
|
if (vap->va_type == VCHR || vap->va_type == VBLK)
|
|
rdev = txdr_unsigned(vap->va_rdev);
|
|
else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
|
|
rdev = nfs_xdrneg1;
|
|
else {
|
|
return (EOPNOTSUPP);
|
|
}
|
|
if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
|
|
return (error);
|
|
nfsstats.rpccnt[NFSPROC_MKNOD]++;
|
|
mreq = nfsm_reqhead(dvp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED +
|
|
+ nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3));
|
|
mb = mreq;
|
|
bpos = mtod(mb, caddr_t);
|
|
nfsm_fhtom(dvp, v3);
|
|
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
|
|
if (v3) {
|
|
tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
|
|
*tl++ = vtonfsv3_type(vap->va_type);
|
|
nfsm_v3attrbuild(vap, FALSE);
|
|
if (vap->va_type == VCHR || vap->va_type == VBLK) {
|
|
tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED);
|
|
*tl++ = txdr_unsigned(major(vap->va_rdev));
|
|
*tl = txdr_unsigned(minor(vap->va_rdev));
|
|
}
|
|
} else {
|
|
sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
|
|
sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
|
|
sp->sa_uid = nfs_xdrneg1;
|
|
sp->sa_gid = nfs_xdrneg1;
|
|
sp->sa_size = rdev;
|
|
txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
|
|
txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
|
|
}
|
|
nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_thread, cnp->cn_cred);
|
|
if (!error) {
|
|
nfsm_mtofh(dvp, newvp, v3, gotvp);
|
|
if (!gotvp) {
|
|
if (newvp) {
|
|
vput(newvp);
|
|
newvp = NULL;
|
|
}
|
|
error = nfs_lookitup(dvp, cnp->cn_nameptr,
|
|
cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np);
|
|
if (!error)
|
|
newvp = NFSTOV(np);
|
|
}
|
|
}
|
|
if (v3)
|
|
nfsm_wcc_data(dvp, wccflag);
|
|
m_freem(mrep);
|
|
nfsmout:
|
|
if (error) {
|
|
if (newvp)
|
|
vput(newvp);
|
|
} else {
|
|
if (cnp->cn_flags & MAKEENTRY)
|
|
cache_enter(dvp, newvp, cnp);
|
|
*vpp = newvp;
|
|
}
|
|
mtx_lock(&(VTONFS(dvp))->n_mtx);
|
|
VTONFS(dvp)->n_flag |= NMODIFIED;
|
|
if (!wccflag) {
|
|
VTONFS(dvp)->n_attrstamp = 0;
|
|
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
|
|
}
|
|
mtx_unlock(&(VTONFS(dvp))->n_mtx);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* nfs mknod vop
|
|
* just call nfs_mknodrpc() to do the work.
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
nfs_mknod(struct vop_mknod_args *ap)
|
|
{
|
|
return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap));
|
|
}
|
|
|
|
static u_long create_verf;
|
|
/*
|
|
* nfs file create call
|
|
*/
|
|
static int
|
|
nfs_create(struct vop_create_args *ap)
|
|
{
|
|
struct vnode *dvp = ap->a_dvp;
|
|
struct vattr *vap = ap->a_vap;
|
|
struct componentname *cnp = ap->a_cnp;
|
|
struct nfsv2_sattr *sp;
|
|
u_int32_t *tl;
|
|
struct nfsnode *np = NULL;
|
|
struct vnode *newvp = NULL;
|
|
caddr_t bpos, dpos;
|
|
int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0;
|
|
struct mbuf *mreq, *mrep, *md, *mb;
|
|
struct vattr vattr;
|
|
int v3 = NFS_ISV3(dvp);
|
|
|
|
CURVNET_SET(CRED_TO_VNET(curthread->td_ucred));
|
|
|
|
/*
|
|
* Oops, not for me..
|
|
*/
|
|
if (vap->va_type == VSOCK) {
|
|
error = nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap);
|
|
CURVNET_RESTORE();
|
|
return (error);
|
|
}
|
|
|
|
if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) {
|
|
CURVNET_RESTORE();
|
|
return (error);
|
|
}
|
|
if (vap->va_vaflags & VA_EXCLUSIVE)
|
|
fmode |= O_EXCL;
|
|
again:
|
|
nfsstats.rpccnt[NFSPROC_CREATE]++;
|
|
mreq = nfsm_reqhead(dvp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED +
|
|
nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3));
|
|
mb = mreq;
|
|
bpos = mtod(mb, caddr_t);
|
|
nfsm_fhtom(dvp, v3);
|
|
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
|
|
if (v3) {
|
|
tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
|
|
if (fmode & O_EXCL) {
|
|
*tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE);
|
|
tl = nfsm_build(u_int32_t *, NFSX_V3CREATEVERF);
|
|
#ifdef INET
|
|
CURVNET_SET(CRED_TO_VNET(cnp->cn_cred));
|
|
IN_IFADDR_RLOCK();
|
|
if (!TAILQ_EMPTY(&V_in_ifaddrhead))
|
|
*tl++ = IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr.s_addr;
|
|
else
|
|
#endif
|
|
*tl++ = create_verf;
|
|
#ifdef INET
|
|
IN_IFADDR_RUNLOCK();
|
|
CURVNET_RESTORE();
|
|
#endif
|
|
*tl = ++create_verf;
|
|
} else {
|
|
*tl = txdr_unsigned(NFSV3CREATE_UNCHECKED);
|
|
nfsm_v3attrbuild(vap, FALSE);
|
|
}
|
|
} else {
|
|
sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
|
|
sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
|
|
sp->sa_uid = nfs_xdrneg1;
|
|
sp->sa_gid = nfs_xdrneg1;
|
|
sp->sa_size = 0;
|
|
txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
|
|
txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
|
|
}
|
|
nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_thread, cnp->cn_cred);
|
|
if (!error) {
|
|
nfsm_mtofh(dvp, newvp, v3, gotvp);
|
|
if (!gotvp) {
|
|
if (newvp) {
|
|
vput(newvp);
|
|
newvp = NULL;
|
|
}
|
|
error = nfs_lookitup(dvp, cnp->cn_nameptr,
|
|
cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np);
|
|
if (!error)
|
|
newvp = NFSTOV(np);
|
|
}
|
|
}
|
|
if (v3)
|
|
nfsm_wcc_data(dvp, wccflag);
|
|
m_freem(mrep);
|
|
nfsmout:
|
|
if (error) {
|
|
if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) {
|
|
fmode &= ~O_EXCL;
|
|
goto again;
|
|
}
|
|
if (newvp)
|
|
vput(newvp);
|
|
} else if (v3 && (fmode & O_EXCL)) {
|
|
/*
|
|
* We are normally called with only a partially initialized
|
|
* VAP. Since the NFSv3 spec says that server may use the
|
|
* file attributes to store the verifier, the spec requires
|
|
* us to do a SETATTR RPC. FreeBSD servers store the verifier
|
|
* in atime, but we can't really assume that all servers will
|
|
* so we ensure that our SETATTR sets both atime and mtime.
|
|
*/
|
|
if (vap->va_mtime.tv_sec == VNOVAL)
|
|
vfs_timestamp(&vap->va_mtime);
|
|
if (vap->va_atime.tv_sec == VNOVAL)
|
|
vap->va_atime = vap->va_mtime;
|
|
error = nfs_setattrrpc(newvp, vap, cnp->cn_cred);
|
|
if (error)
|
|
vput(newvp);
|
|
}
|
|
if (!error) {
|
|
if (cnp->cn_flags & MAKEENTRY)
|
|
cache_enter(dvp, newvp, cnp);
|
|
*ap->a_vpp = newvp;
|
|
}
|
|
mtx_lock(&(VTONFS(dvp))->n_mtx);
|
|
VTONFS(dvp)->n_flag |= NMODIFIED;
|
|
if (!wccflag) {
|
|
VTONFS(dvp)->n_attrstamp = 0;
|
|
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
|
|
}
|
|
mtx_unlock(&(VTONFS(dvp))->n_mtx);
|
|
CURVNET_RESTORE();
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* nfs file remove call
|
|
* To try and make nfs semantics closer to ufs semantics, a file that has
|
|
* other processes using the vnode is renamed instead of removed and then
|
|
* removed later on the last close.
|
|
* - If v_usecount > 1
|
|
* If a rename is not already in the works
|
|
* call nfs_sillyrename() to set it up
|
|
* else
|
|
* do the remove rpc
|
|
*/
|
|
static int
|
|
nfs_remove(struct vop_remove_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct vnode *dvp = ap->a_dvp;
|
|
struct componentname *cnp = ap->a_cnp;
|
|
struct nfsnode *np = VTONFS(vp);
|
|
int error = 0;
|
|
struct vattr vattr;
|
|
|
|
#ifndef DIAGNOSTIC
|
|
if ((cnp->cn_flags & HASBUF) == 0)
|
|
panic("nfs_remove: no name");
|
|
if (vrefcnt(vp) < 1)
|
|
panic("nfs_remove: bad v_usecount");
|
|
#endif
|
|
if (vp->v_type == VDIR)
|
|
error = EPERM;
|
|
else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
|
|
!VOP_GETATTR(vp, &vattr, cnp->cn_cred) && vattr.va_nlink > 1)) {
|
|
/*
|
|
* Purge the name cache so that the chance of a lookup for
|
|
* the name succeeding while the remove is in progress is
|
|
* minimized. Without node locking it can still happen, such
|
|
* that an I/O op returns ESTALE, but since you get this if
|
|
* another host removes the file..
|
|
*/
|
|
cache_purge(vp);
|
|
/*
|
|
* throw away biocache buffers, mainly to avoid
|
|
* unnecessary delayed writes later.
|
|
*/
|
|
error = nfs_vinvalbuf(vp, 0, cnp->cn_thread, 1);
|
|
/* Do the rpc */
|
|
if (error != EINTR && error != EIO)
|
|
error = nfs_removerpc(dvp, cnp->cn_nameptr,
|
|
cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
|
|
/*
|
|
* Kludge City: If the first reply to the remove rpc is lost..
|
|
* the reply to the retransmitted request will be ENOENT
|
|
* since the file was in fact removed
|
|
* Therefore, we cheat and return success.
|
|
*/
|
|
if (error == ENOENT)
|
|
error = 0;
|
|
} else if (!np->n_sillyrename)
|
|
error = nfs_sillyrename(dvp, vp, cnp);
|
|
np->n_attrstamp = 0;
|
|
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* nfs file remove rpc called from nfs_inactive
|
|
*/
|
|
int
|
|
nfs_removeit(struct sillyrename *sp)
|
|
{
|
|
/*
|
|
* Make sure that the directory vnode is still valid.
|
|
* XXX we should lock sp->s_dvp here.
|
|
*/
|
|
if (sp->s_dvp->v_type == VBAD)
|
|
return (0);
|
|
return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred,
|
|
NULL));
|
|
}
|
|
|
|
/*
|
|
* Nfs remove rpc, called from nfs_remove() and nfs_removeit().
|
|
*/
|
|
static int
|
|
nfs_removerpc(struct vnode *dvp, const char *name, int namelen,
|
|
struct ucred *cred, struct thread *td)
|
|
{
|
|
caddr_t bpos, dpos;
|
|
int error = 0, wccflag = NFSV3_WCCRATTR;
|
|
struct mbuf *mreq, *mrep, *md, *mb;
|
|
int v3 = NFS_ISV3(dvp);
|
|
|
|
nfsstats.rpccnt[NFSPROC_REMOVE]++;
|
|
mreq = nfsm_reqhead(dvp, NFSPROC_REMOVE,
|
|
NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen));
|
|
mb = mreq;
|
|
bpos = mtod(mb, caddr_t);
|
|
nfsm_fhtom(dvp, v3);
|
|
nfsm_strtom(name, namelen, NFS_MAXNAMLEN);
|
|
nfsm_request(dvp, NFSPROC_REMOVE, td, cred);
|
|
if (v3)
|
|
nfsm_wcc_data(dvp, wccflag);
|
|
m_freem(mrep);
|
|
nfsmout:
|
|
mtx_lock(&(VTONFS(dvp))->n_mtx);
|
|
VTONFS(dvp)->n_flag |= NMODIFIED;
|
|
if (!wccflag) {
|
|
VTONFS(dvp)->n_attrstamp = 0;
|
|
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
|
|
}
|
|
mtx_unlock(&(VTONFS(dvp))->n_mtx);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* nfs file rename call
|
|
*/
|
|
static int
|
|
nfs_rename(struct vop_rename_args *ap)
|
|
{
|
|
struct vnode *fvp = ap->a_fvp;
|
|
struct vnode *tvp = ap->a_tvp;
|
|
struct vnode *fdvp = ap->a_fdvp;
|
|
struct vnode *tdvp = ap->a_tdvp;
|
|
struct componentname *tcnp = ap->a_tcnp;
|
|
struct componentname *fcnp = ap->a_fcnp;
|
|
int error;
|
|
|
|
#ifndef DIAGNOSTIC
|
|
if ((tcnp->cn_flags & HASBUF) == 0 ||
|
|
(fcnp->cn_flags & HASBUF) == 0)
|
|
panic("nfs_rename: no name");
|
|
#endif
|
|
/* Check for cross-device rename */
|
|
if ((fvp->v_mount != tdvp->v_mount) ||
|
|
(tvp && (fvp->v_mount != tvp->v_mount))) {
|
|
error = EXDEV;
|
|
goto out;
|
|
}
|
|
|
|
if (fvp == tvp) {
|
|
nfs_printf("nfs_rename: fvp == tvp (can't happen)\n");
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
|
|
goto out;
|
|
|
|
/*
|
|
* We have to flush B_DELWRI data prior to renaming
|
|
* the file. If we don't, the delayed-write buffers
|
|
* can be flushed out later after the file has gone stale
|
|
* under NFSV3. NFSV2 does not have this problem because
|
|
* ( as far as I can tell ) it flushes dirty buffers more
|
|
* often.
|
|
*
|
|
* Skip the rename operation if the fsync fails, this can happen
|
|
* due to the server's volume being full, when we pushed out data
|
|
* that was written back to our cache earlier. Not checking for
|
|
* this condition can result in potential (silent) data loss.
|
|
*/
|
|
error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread);
|
|
VOP_UNLOCK(fvp, 0);
|
|
if (!error && tvp)
|
|
error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread);
|
|
if (error)
|
|
goto out;
|
|
|
|
/*
|
|
* If the tvp exists and is in use, sillyrename it before doing the
|
|
* rename of the new file over it.
|
|
* XXX Can't sillyrename a directory.
|
|
*/
|
|
if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
|
|
tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
|
|
vput(tvp);
|
|
tvp = NULL;
|
|
}
|
|
|
|
error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen,
|
|
tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
|
|
tcnp->cn_thread);
|
|
|
|
if (fvp->v_type == VDIR) {
|
|
if (tvp != NULL && tvp->v_type == VDIR)
|
|
cache_purge(tdvp);
|
|
cache_purge(fdvp);
|
|
}
|
|
|
|
out:
|
|
if (tdvp == tvp)
|
|
vrele(tdvp);
|
|
else
|
|
vput(tdvp);
|
|
if (tvp)
|
|
vput(tvp);
|
|
vrele(fdvp);
|
|
vrele(fvp);
|
|
/*
|
|
* Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
|
|
*/
|
|
if (error == ENOENT)
|
|
error = 0;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* nfs file rename rpc called from nfs_remove() above
|
|
*/
|
|
static int
|
|
nfs_renameit(struct vnode *sdvp, struct componentname *scnp,
|
|
struct sillyrename *sp)
|
|
{
|
|
|
|
return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, sdvp,
|
|
sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_thread));
|
|
}
|
|
|
|
/*
|
|
* Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
|
|
*/
|
|
static int
|
|
nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen,
|
|
struct vnode *tdvp, const char *tnameptr, int tnamelen, struct ucred *cred,
|
|
struct thread *td)
|
|
{
|
|
caddr_t bpos, dpos;
|
|
int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR;
|
|
struct mbuf *mreq, *mrep, *md, *mb;
|
|
int v3 = NFS_ISV3(fdvp);
|
|
|
|
nfsstats.rpccnt[NFSPROC_RENAME]++;
|
|
mreq = nfsm_reqhead(fdvp, NFSPROC_RENAME,
|
|
(NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) +
|
|
nfsm_rndup(tnamelen));
|
|
mb = mreq;
|
|
bpos = mtod(mb, caddr_t);
|
|
nfsm_fhtom(fdvp, v3);
|
|
nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN);
|
|
nfsm_fhtom(tdvp, v3);
|
|
nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN);
|
|
nfsm_request(fdvp, NFSPROC_RENAME, td, cred);
|
|
if (v3) {
|
|
nfsm_wcc_data(fdvp, fwccflag);
|
|
nfsm_wcc_data(tdvp, twccflag);
|
|
}
|
|
m_freem(mrep);
|
|
nfsmout:
|
|
mtx_lock(&(VTONFS(fdvp))->n_mtx);
|
|
VTONFS(fdvp)->n_flag |= NMODIFIED;
|
|
mtx_unlock(&(VTONFS(fdvp))->n_mtx);
|
|
mtx_lock(&(VTONFS(tdvp))->n_mtx);
|
|
VTONFS(tdvp)->n_flag |= NMODIFIED;
|
|
mtx_unlock(&(VTONFS(tdvp))->n_mtx);
|
|
if (!fwccflag) {
|
|
VTONFS(fdvp)->n_attrstamp = 0;
|
|
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp);
|
|
}
|
|
if (!twccflag) {
|
|
VTONFS(tdvp)->n_attrstamp = 0;
|
|
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* nfs hard link create call
|
|
*/
|
|
static int
|
|
nfs_link(struct vop_link_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct vnode *tdvp = ap->a_tdvp;
|
|
struct componentname *cnp = ap->a_cnp;
|
|
caddr_t bpos, dpos;
|
|
int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0;
|
|
struct mbuf *mreq, *mrep, *md, *mb;
|
|
int v3;
|
|
|
|
if (vp->v_mount != tdvp->v_mount) {
|
|
return (EXDEV);
|
|
}
|
|
|
|
/*
|
|
* Push all writes to the server, so that the attribute cache
|
|
* doesn't get "out of sync" with the server.
|
|
* XXX There should be a better way!
|
|
*/
|
|
VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread);
|
|
|
|
v3 = NFS_ISV3(vp);
|
|
nfsstats.rpccnt[NFSPROC_LINK]++;
|
|
mreq = nfsm_reqhead(vp, NFSPROC_LINK,
|
|
NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen));
|
|
mb = mreq;
|
|
bpos = mtod(mb, caddr_t);
|
|
nfsm_fhtom(vp, v3);
|
|
nfsm_fhtom(tdvp, v3);
|
|
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
|
|
nfsm_request(vp, NFSPROC_LINK, cnp->cn_thread, cnp->cn_cred);
|
|
if (v3) {
|
|
nfsm_postop_attr(vp, attrflag);
|
|
nfsm_wcc_data(tdvp, wccflag);
|
|
}
|
|
m_freem(mrep);
|
|
nfsmout:
|
|
mtx_lock(&(VTONFS(tdvp))->n_mtx);
|
|
VTONFS(tdvp)->n_flag |= NMODIFIED;
|
|
mtx_unlock(&(VTONFS(tdvp))->n_mtx);
|
|
if (!attrflag) {
|
|
VTONFS(vp)->n_attrstamp = 0;
|
|
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
|
|
}
|
|
if (!wccflag) {
|
|
VTONFS(tdvp)->n_attrstamp = 0;
|
|
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* nfs symbolic link create call
|
|
*/
|
|
static int
|
|
nfs_symlink(struct vop_symlink_args *ap)
|
|
{
|
|
struct vnode *dvp = ap->a_dvp;
|
|
struct vattr *vap = ap->a_vap;
|
|
struct componentname *cnp = ap->a_cnp;
|
|
struct nfsv2_sattr *sp;
|
|
caddr_t bpos, dpos;
|
|
int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp;
|
|
struct mbuf *mreq, *mrep, *md, *mb;
|
|
struct vnode *newvp = NULL;
|
|
int v3 = NFS_ISV3(dvp);
|
|
|
|
nfsstats.rpccnt[NFSPROC_SYMLINK]++;
|
|
slen = strlen(ap->a_target);
|
|
mreq = nfsm_reqhead(dvp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED +
|
|
nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3));
|
|
mb = mreq;
|
|
bpos = mtod(mb, caddr_t);
|
|
nfsm_fhtom(dvp, v3);
|
|
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
|
|
if (v3) {
|
|
nfsm_v3attrbuild(vap, FALSE);
|
|
}
|
|
nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN);
|
|
if (!v3) {
|
|
sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
|
|
sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode);
|
|
sp->sa_uid = nfs_xdrneg1;
|
|
sp->sa_gid = nfs_xdrneg1;
|
|
sp->sa_size = nfs_xdrneg1;
|
|
txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
|
|
txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
|
|
}
|
|
|
|
/*
|
|
* Issue the NFS request and get the rpc response.
|
|
*
|
|
* Only NFSv3 responses returning an error of 0 actually return
|
|
* a file handle that can be converted into newvp without having
|
|
* to do an extra lookup rpc.
|
|
*/
|
|
nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_thread, cnp->cn_cred);
|
|
if (v3) {
|
|
if (error == 0)
|
|
nfsm_mtofh(dvp, newvp, v3, gotvp);
|
|
nfsm_wcc_data(dvp, wccflag);
|
|
}
|
|
|
|
/*
|
|
* out code jumps -> here, mrep is also freed.
|
|
*/
|
|
|
|
m_freem(mrep);
|
|
nfsmout:
|
|
|
|
/*
|
|
* If we do not have an error and we could not extract the newvp from
|
|
* the response due to the request being NFSv2, we have to do a
|
|
* lookup in order to obtain a newvp to return.
|
|
*/
|
|
if (error == 0 && newvp == NULL) {
|
|
struct nfsnode *np = NULL;
|
|
|
|
error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
|
|
cnp->cn_cred, cnp->cn_thread, &np);
|
|
if (!error)
|
|
newvp = NFSTOV(np);
|
|
}
|
|
if (error) {
|
|
if (newvp)
|
|
vput(newvp);
|
|
} else {
|
|
*ap->a_vpp = newvp;
|
|
}
|
|
mtx_lock(&(VTONFS(dvp))->n_mtx);
|
|
VTONFS(dvp)->n_flag |= NMODIFIED;
|
|
mtx_unlock(&(VTONFS(dvp))->n_mtx);
|
|
if (!wccflag) {
|
|
VTONFS(dvp)->n_attrstamp = 0;
|
|
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* nfs make dir call
|
|
*/
|
|
static int
|
|
nfs_mkdir(struct vop_mkdir_args *ap)
|
|
{
|
|
struct vnode *dvp = ap->a_dvp;
|
|
struct vattr *vap = ap->a_vap;
|
|
struct componentname *cnp = ap->a_cnp;
|
|
struct nfsv2_sattr *sp;
|
|
int len;
|
|
struct nfsnode *np = NULL;
|
|
struct vnode *newvp = NULL;
|
|
caddr_t bpos, dpos;
|
|
int error = 0, wccflag = NFSV3_WCCRATTR;
|
|
int gotvp = 0;
|
|
struct mbuf *mreq, *mrep, *md, *mb;
|
|
struct vattr vattr;
|
|
int v3 = NFS_ISV3(dvp);
|
|
|
|
if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
|
|
return (error);
|
|
len = cnp->cn_namelen;
|
|
nfsstats.rpccnt[NFSPROC_MKDIR]++;
|
|
mreq = nfsm_reqhead(dvp, NFSPROC_MKDIR,
|
|
NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3));
|
|
mb = mreq;
|
|
bpos = mtod(mb, caddr_t);
|
|
nfsm_fhtom(dvp, v3);
|
|
nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN);
|
|
if (v3) {
|
|
nfsm_v3attrbuild(vap, FALSE);
|
|
} else {
|
|
sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
|
|
sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode);
|
|
sp->sa_uid = nfs_xdrneg1;
|
|
sp->sa_gid = nfs_xdrneg1;
|
|
sp->sa_size = nfs_xdrneg1;
|
|
txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
|
|
txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
|
|
}
|
|
nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_thread, cnp->cn_cred);
|
|
if (!error)
|
|
nfsm_mtofh(dvp, newvp, v3, gotvp);
|
|
if (v3)
|
|
nfsm_wcc_data(dvp, wccflag);
|
|
m_freem(mrep);
|
|
nfsmout:
|
|
mtx_lock(&(VTONFS(dvp))->n_mtx);
|
|
VTONFS(dvp)->n_flag |= NMODIFIED;
|
|
mtx_unlock(&(VTONFS(dvp))->n_mtx);
|
|
if (!wccflag) {
|
|
VTONFS(dvp)->n_attrstamp = 0;
|
|
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
|
|
}
|
|
if (error == 0 && newvp == NULL) {
|
|
error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred,
|
|
cnp->cn_thread, &np);
|
|
if (!error) {
|
|
newvp = NFSTOV(np);
|
|
if (newvp->v_type != VDIR)
|
|
error = EEXIST;
|
|
}
|
|
}
|
|
if (error) {
|
|
if (newvp)
|
|
vput(newvp);
|
|
} else
|
|
*ap->a_vpp = newvp;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* nfs remove directory call
|
|
*/
|
|
static int
|
|
nfs_rmdir(struct vop_rmdir_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct vnode *dvp = ap->a_dvp;
|
|
struct componentname *cnp = ap->a_cnp;
|
|
caddr_t bpos, dpos;
|
|
int error = 0, wccflag = NFSV3_WCCRATTR;
|
|
struct mbuf *mreq, *mrep, *md, *mb;
|
|
int v3 = NFS_ISV3(dvp);
|
|
|
|
if (dvp == vp)
|
|
return (EINVAL);
|
|
nfsstats.rpccnt[NFSPROC_RMDIR]++;
|
|
mreq = nfsm_reqhead(dvp, NFSPROC_RMDIR,
|
|
NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen));
|
|
mb = mreq;
|
|
bpos = mtod(mb, caddr_t);
|
|
nfsm_fhtom(dvp, v3);
|
|
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
|
|
nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_thread, cnp->cn_cred);
|
|
if (v3)
|
|
nfsm_wcc_data(dvp, wccflag);
|
|
m_freem(mrep);
|
|
nfsmout:
|
|
mtx_lock(&(VTONFS(dvp))->n_mtx);
|
|
VTONFS(dvp)->n_flag |= NMODIFIED;
|
|
mtx_unlock(&(VTONFS(dvp))->n_mtx);
|
|
if (!wccflag) {
|
|
VTONFS(dvp)->n_attrstamp = 0;
|
|
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
|
|
}
|
|
cache_purge(dvp);
|
|
cache_purge(vp);
|
|
/*
|
|
* Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
|
|
*/
|
|
if (error == ENOENT)
|
|
error = 0;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* nfs readdir call
|
|
*/
|
|
static int
|
|
nfs_readdir(struct vop_readdir_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct nfsnode *np = VTONFS(vp);
|
|
struct uio *uio = ap->a_uio;
|
|
int tresid, error = 0;
|
|
struct vattr vattr;
|
|
|
|
if (vp->v_type != VDIR)
|
|
return(EPERM);
|
|
|
|
/*
|
|
* First, check for hit on the EOF offset cache
|
|
*/
|
|
if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
|
|
(np->n_flag & NMODIFIED) == 0) {
|
|
if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) {
|
|
mtx_lock(&np->n_mtx);
|
|
if (!NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
|
|
mtx_unlock(&np->n_mtx);
|
|
nfsstats.direofcache_hits++;
|
|
goto out;
|
|
} else
|
|
mtx_unlock(&np->n_mtx);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Call nfs_bioread() to do the real work.
|
|
*/
|
|
tresid = uio->uio_resid;
|
|
error = nfs_bioread(vp, uio, 0, ap->a_cred);
|
|
|
|
if (!error && uio->uio_resid == tresid) {
|
|
nfsstats.direofcache_misses++;
|
|
}
|
|
out:
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Readdir rpc call.
|
|
* Called from below the buffer cache by nfs_doio().
|
|
*/
|
|
int
|
|
nfs_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
|
|
{
|
|
int len, left;
|
|
struct dirent *dp = NULL;
|
|
u_int32_t *tl;
|
|
caddr_t cp;
|
|
nfsuint64 *cookiep;
|
|
caddr_t bpos, dpos;
|
|
struct mbuf *mreq, *mrep, *md, *mb;
|
|
nfsuint64 cookie;
|
|
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
|
|
struct nfsnode *dnp = VTONFS(vp);
|
|
u_quad_t fileno;
|
|
int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1;
|
|
int attrflag;
|
|
int v3 = NFS_ISV3(vp);
|
|
|
|
#ifndef DIAGNOSTIC
|
|
if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) ||
|
|
(uiop->uio_resid & (DIRBLKSIZ - 1)))
|
|
panic("nfs readdirrpc bad uio");
|
|
#endif
|
|
|
|
/*
|
|
* If there is no cookie, assume directory was stale.
|
|
*/
|
|
nfs_dircookie_lock(dnp);
|
|
cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0);
|
|
if (cookiep) {
|
|
cookie = *cookiep;
|
|
nfs_dircookie_unlock(dnp);
|
|
} else {
|
|
nfs_dircookie_unlock(dnp);
|
|
return (NFSERR_BAD_COOKIE);
|
|
}
|
|
|
|
/*
|
|
* Loop around doing readdir rpc's of size nm_readdirsize
|
|
* truncated to a multiple of DIRBLKSIZ.
|
|
* The stopping criteria is EOF or buffer full.
|
|
*/
|
|
while (more_dirs && bigenough) {
|
|
nfsstats.rpccnt[NFSPROC_READDIR]++;
|
|
mreq = nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) +
|
|
NFSX_READDIR(v3));
|
|
mb = mreq;
|
|
bpos = mtod(mb, caddr_t);
|
|
nfsm_fhtom(vp, v3);
|
|
if (v3) {
|
|
tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED);
|
|
*tl++ = cookie.nfsuquad[0];
|
|
*tl++ = cookie.nfsuquad[1];
|
|
mtx_lock(&dnp->n_mtx);
|
|
*tl++ = dnp->n_cookieverf.nfsuquad[0];
|
|
*tl++ = dnp->n_cookieverf.nfsuquad[1];
|
|
mtx_unlock(&dnp->n_mtx);
|
|
} else {
|
|
tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED);
|
|
*tl++ = cookie.nfsuquad[0];
|
|
}
|
|
*tl = txdr_unsigned(nmp->nm_readdirsize);
|
|
nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, cred);
|
|
if (v3) {
|
|
nfsm_postop_attr(vp, attrflag);
|
|
if (!error) {
|
|
tl = nfsm_dissect(u_int32_t *,
|
|
2 * NFSX_UNSIGNED);
|
|
mtx_lock(&dnp->n_mtx);
|
|
dnp->n_cookieverf.nfsuquad[0] = *tl++;
|
|
dnp->n_cookieverf.nfsuquad[1] = *tl;
|
|
mtx_unlock(&dnp->n_mtx);
|
|
} else {
|
|
m_freem(mrep);
|
|
goto nfsmout;
|
|
}
|
|
}
|
|
tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
|
|
more_dirs = fxdr_unsigned(int, *tl);
|
|
|
|
/* loop thru the dir entries, doctoring them to 4bsd form */
|
|
while (more_dirs && bigenough) {
|
|
if (v3) {
|
|
tl = nfsm_dissect(u_int32_t *,
|
|
3 * NFSX_UNSIGNED);
|
|
fileno = fxdr_hyper(tl);
|
|
len = fxdr_unsigned(int, *(tl + 2));
|
|
} else {
|
|
tl = nfsm_dissect(u_int32_t *,
|
|
2 * NFSX_UNSIGNED);
|
|
fileno = fxdr_unsigned(u_quad_t, *tl++);
|
|
len = fxdr_unsigned(int, *tl);
|
|
}
|
|
if (len <= 0 || len > NFS_MAXNAMLEN) {
|
|
error = EBADRPC;
|
|
m_freem(mrep);
|
|
goto nfsmout;
|
|
}
|
|
tlen = nfsm_rndup(len);
|
|
if (tlen == len)
|
|
tlen += 4; /* To ensure null termination */
|
|
left = DIRBLKSIZ - blksiz;
|
|
if ((tlen + DIRHDSIZ) > left) {
|
|
dp->d_reclen += left;
|
|
uiop->uio_iov->iov_base =
|
|
(char *)uiop->uio_iov->iov_base + left;
|
|
uiop->uio_iov->iov_len -= left;
|
|
uiop->uio_offset += left;
|
|
uiop->uio_resid -= left;
|
|
blksiz = 0;
|
|
}
|
|
if ((tlen + DIRHDSIZ) > uiop->uio_resid)
|
|
bigenough = 0;
|
|
if (bigenough) {
|
|
dp = (struct dirent *)uiop->uio_iov->iov_base;
|
|
dp->d_fileno = (int)fileno;
|
|
dp->d_namlen = len;
|
|
dp->d_reclen = tlen + DIRHDSIZ;
|
|
dp->d_type = DT_UNKNOWN;
|
|
blksiz += dp->d_reclen;
|
|
if (blksiz == DIRBLKSIZ)
|
|
blksiz = 0;
|
|
uiop->uio_offset += DIRHDSIZ;
|
|
uiop->uio_resid -= DIRHDSIZ;
|
|
uiop->uio_iov->iov_base =
|
|
(char *)uiop->uio_iov->iov_base + DIRHDSIZ;
|
|
uiop->uio_iov->iov_len -= DIRHDSIZ;
|
|
nfsm_mtouio(uiop, len);
|
|
cp = uiop->uio_iov->iov_base;
|
|
tlen -= len;
|
|
*cp = '\0'; /* null terminate */
|
|
uiop->uio_iov->iov_base =
|
|
(char *)uiop->uio_iov->iov_base + tlen;
|
|
uiop->uio_iov->iov_len -= tlen;
|
|
uiop->uio_offset += tlen;
|
|
uiop->uio_resid -= tlen;
|
|
} else
|
|
nfsm_adv(nfsm_rndup(len));
|
|
if (v3) {
|
|
tl = nfsm_dissect(u_int32_t *,
|
|
3 * NFSX_UNSIGNED);
|
|
} else {
|
|
tl = nfsm_dissect(u_int32_t *,
|
|
2 * NFSX_UNSIGNED);
|
|
}
|
|
if (bigenough) {
|
|
cookie.nfsuquad[0] = *tl++;
|
|
if (v3)
|
|
cookie.nfsuquad[1] = *tl++;
|
|
} else if (v3)
|
|
tl += 2;
|
|
else
|
|
tl++;
|
|
more_dirs = fxdr_unsigned(int, *tl);
|
|
}
|
|
/*
|
|
* If at end of rpc data, get the eof boolean
|
|
*/
|
|
if (!more_dirs) {
|
|
tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
|
|
more_dirs = (fxdr_unsigned(int, *tl) == 0);
|
|
}
|
|
m_freem(mrep);
|
|
}
|
|
/*
|
|
* Fill last record, iff any, out to a multiple of DIRBLKSIZ
|
|
* by increasing d_reclen for the last record.
|
|
*/
|
|
if (blksiz > 0) {
|
|
left = DIRBLKSIZ - blksiz;
|
|
dp->d_reclen += left;
|
|
uiop->uio_iov->iov_base =
|
|
(char *)uiop->uio_iov->iov_base + left;
|
|
uiop->uio_iov->iov_len -= left;
|
|
uiop->uio_offset += left;
|
|
uiop->uio_resid -= left;
|
|
}
|
|
|
|
/*
|
|
* We are now either at the end of the directory or have filled the
|
|
* block.
|
|
*/
|
|
if (bigenough)
|
|
dnp->n_direofoffset = uiop->uio_offset;
|
|
else {
|
|
if (uiop->uio_resid > 0)
|
|
nfs_printf("EEK! readdirrpc resid > 0\n");
|
|
nfs_dircookie_lock(dnp);
|
|
cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1);
|
|
*cookiep = cookie;
|
|
nfs_dircookie_unlock(dnp);
|
|
}
|
|
nfsmout:
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc().
|
|
*/
|
|
int
|
|
nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
|
|
{
|
|
int len, left;
|
|
struct dirent *dp;
|
|
u_int32_t *tl;
|
|
caddr_t cp;
|
|
struct vnode *newvp;
|
|
nfsuint64 *cookiep;
|
|
caddr_t bpos, dpos, dpossav1, dpossav2;
|
|
struct mbuf *mreq, *mrep, *md, *mb, *mdsav1, *mdsav2;
|
|
struct nameidata nami, *ndp = &nami;
|
|
struct componentname *cnp = &ndp->ni_cnd;
|
|
nfsuint64 cookie;
|
|
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
|
|
struct nfsnode *dnp = VTONFS(vp), *np;
|
|
nfsfh_t *fhp;
|
|
u_quad_t fileno;
|
|
int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i;
|
|
int attrflag, fhsize;
|
|
|
|
#ifndef nolint
|
|
dp = NULL;
|
|
#endif
|
|
#ifndef DIAGNOSTIC
|
|
if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) ||
|
|
(uiop->uio_resid & (DIRBLKSIZ - 1)))
|
|
panic("nfs readdirplusrpc bad uio");
|
|
#endif
|
|
ndp->ni_dvp = vp;
|
|
newvp = NULLVP;
|
|
|
|
/*
|
|
* If there is no cookie, assume directory was stale.
|
|
*/
|
|
nfs_dircookie_lock(dnp);
|
|
cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0);
|
|
if (cookiep) {
|
|
cookie = *cookiep;
|
|
nfs_dircookie_unlock(dnp);
|
|
} else {
|
|
nfs_dircookie_unlock(dnp);
|
|
return (NFSERR_BAD_COOKIE);
|
|
}
|
|
/*
|
|
* Loop around doing readdir rpc's of size nm_readdirsize
|
|
* truncated to a multiple of DIRBLKSIZ.
|
|
* The stopping criteria is EOF or buffer full.
|
|
*/
|
|
while (more_dirs && bigenough) {
|
|
nfsstats.rpccnt[NFSPROC_READDIRPLUS]++;
|
|
mreq = nfsm_reqhead(vp, NFSPROC_READDIRPLUS,
|
|
NFSX_FH(1) + 6 * NFSX_UNSIGNED);
|
|
mb = mreq;
|
|
bpos = mtod(mb, caddr_t);
|
|
nfsm_fhtom(vp, 1);
|
|
tl = nfsm_build(u_int32_t *, 6 * NFSX_UNSIGNED);
|
|
*tl++ = cookie.nfsuquad[0];
|
|
*tl++ = cookie.nfsuquad[1];
|
|
mtx_lock(&dnp->n_mtx);
|
|
*tl++ = dnp->n_cookieverf.nfsuquad[0];
|
|
*tl++ = dnp->n_cookieverf.nfsuquad[1];
|
|
mtx_unlock(&dnp->n_mtx);
|
|
*tl++ = txdr_unsigned(nmp->nm_readdirsize);
|
|
*tl = txdr_unsigned(nmp->nm_rsize);
|
|
nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, cred);
|
|
nfsm_postop_attr(vp, attrflag);
|
|
if (error) {
|
|
m_freem(mrep);
|
|
goto nfsmout;
|
|
}
|
|
tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED);
|
|
mtx_lock(&dnp->n_mtx);
|
|
dnp->n_cookieverf.nfsuquad[0] = *tl++;
|
|
dnp->n_cookieverf.nfsuquad[1] = *tl++;
|
|
mtx_unlock(&dnp->n_mtx);
|
|
more_dirs = fxdr_unsigned(int, *tl);
|
|
|
|
/* loop thru the dir entries, doctoring them to 4bsd form */
|
|
while (more_dirs && bigenough) {
|
|
tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED);
|
|
fileno = fxdr_hyper(tl);
|
|
len = fxdr_unsigned(int, *(tl + 2));
|
|
if (len <= 0 || len > NFS_MAXNAMLEN) {
|
|
error = EBADRPC;
|
|
m_freem(mrep);
|
|
goto nfsmout;
|
|
}
|
|
tlen = nfsm_rndup(len);
|
|
if (tlen == len)
|
|
tlen += 4; /* To ensure null termination*/
|
|
left = DIRBLKSIZ - blksiz;
|
|
if ((tlen + DIRHDSIZ) > left) {
|
|
dp->d_reclen += left;
|
|
uiop->uio_iov->iov_base =
|
|
(char *)uiop->uio_iov->iov_base + left;
|
|
uiop->uio_iov->iov_len -= left;
|
|
uiop->uio_offset += left;
|
|
uiop->uio_resid -= left;
|
|
blksiz = 0;
|
|
}
|
|
if ((tlen + DIRHDSIZ) > uiop->uio_resid)
|
|
bigenough = 0;
|
|
if (bigenough) {
|
|
dp = (struct dirent *)uiop->uio_iov->iov_base;
|
|
dp->d_fileno = (int)fileno;
|
|
dp->d_namlen = len;
|
|
dp->d_reclen = tlen + DIRHDSIZ;
|
|
dp->d_type = DT_UNKNOWN;
|
|
blksiz += dp->d_reclen;
|
|
if (blksiz == DIRBLKSIZ)
|
|
blksiz = 0;
|
|
uiop->uio_offset += DIRHDSIZ;
|
|
uiop->uio_resid -= DIRHDSIZ;
|
|
uiop->uio_iov->iov_base =
|
|
(char *)uiop->uio_iov->iov_base + DIRHDSIZ;
|
|
uiop->uio_iov->iov_len -= DIRHDSIZ;
|
|
cnp->cn_nameptr = uiop->uio_iov->iov_base;
|
|
cnp->cn_namelen = len;
|
|
nfsm_mtouio(uiop, len);
|
|
cp = uiop->uio_iov->iov_base;
|
|
tlen -= len;
|
|
*cp = '\0';
|
|
uiop->uio_iov->iov_base =
|
|
(char *)uiop->uio_iov->iov_base + tlen;
|
|
uiop->uio_iov->iov_len -= tlen;
|
|
uiop->uio_offset += tlen;
|
|
uiop->uio_resid -= tlen;
|
|
} else
|
|
nfsm_adv(nfsm_rndup(len));
|
|
tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED);
|
|
if (bigenough) {
|
|
cookie.nfsuquad[0] = *tl++;
|
|
cookie.nfsuquad[1] = *tl++;
|
|
} else
|
|
tl += 2;
|
|
|
|
/*
|
|
* Since the attributes are before the file handle
|
|
* (sigh), we must skip over the attributes and then
|
|
* come back and get them.
|
|
*/
|
|
attrflag = fxdr_unsigned(int, *tl);
|
|
if (attrflag) {
|
|
dpossav1 = dpos;
|
|
mdsav1 = md;
|
|
nfsm_adv(NFSX_V3FATTR);
|
|
tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
|
|
doit = fxdr_unsigned(int, *tl);
|
|
/*
|
|
* Skip loading the attrs for "..". There's a
|
|
* race between loading the attrs here and
|
|
* lookups that look for the directory currently
|
|
* being read (in the parent). We try to acquire
|
|
* the exclusive lock on ".." here, owning the
|
|
* lock on the directory being read. Lookup will
|
|
* hold the lock on ".." and try to acquire the
|
|
* lock on the directory being read.
|
|
*
|
|
* There are other ways of fixing this, one would
|
|
* be to do a trylock on the ".." vnode and skip
|
|
* loading the attrs on ".." if it happens to be
|
|
* locked by another process. But skipping the
|
|
* attrload on ".." seems the easiest option.
|
|
*/
|
|
if (strcmp(dp->d_name, "..") == 0) {
|
|
doit = 0;
|
|
/*
|
|
* We've already skipped over the attrs,
|
|
* skip over the filehandle. And store d_type
|
|
* as VDIR.
|
|
*/
|
|
tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
|
|
i = fxdr_unsigned(int, *tl);
|
|
nfsm_adv(nfsm_rndup(i));
|
|
dp->d_type = IFTODT(VTTOIF(VDIR));
|
|
}
|
|
if (doit) {
|
|
nfsm_getfh(fhp, fhsize, 1);
|
|
if (NFS_CMPFH(dnp, fhp, fhsize)) {
|
|
VREF(vp);
|
|
newvp = vp;
|
|
np = dnp;
|
|
} else {
|
|
error = nfs_nget(vp->v_mount, fhp,
|
|
fhsize, &np, LK_EXCLUSIVE);
|
|
if (error)
|
|
doit = 0;
|
|
else
|
|
newvp = NFSTOV(np);
|
|
}
|
|
}
|
|
if (doit && bigenough) {
|
|
dpossav2 = dpos;
|
|
dpos = dpossav1;
|
|
mdsav2 = md;
|
|
md = mdsav1;
|
|
nfsm_loadattr(newvp, NULL);
|
|
dpos = dpossav2;
|
|
md = mdsav2;
|
|
dp->d_type =
|
|
IFTODT(VTTOIF(np->n_vattr.va_type));
|
|
ndp->ni_vp = newvp;
|
|
/* Update n_ctime, so subsequent lookup doesn't purge entry */
|
|
np->n_ctime = np->n_vattr.va_ctime.tv_sec;
|
|
cache_enter(ndp->ni_dvp, ndp->ni_vp, cnp);
|
|
}
|
|
} else {
|
|
/* Just skip over the file handle */
|
|
tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
|
|
i = fxdr_unsigned(int, *tl);
|
|
if (i) {
|
|
tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
|
|
fhsize = fxdr_unsigned(int, *tl);
|
|
nfsm_adv(nfsm_rndup(fhsize));
|
|
}
|
|
}
|
|
if (newvp != NULLVP) {
|
|
if (newvp == vp)
|
|
vrele(newvp);
|
|
else
|
|
vput(newvp);
|
|
newvp = NULLVP;
|
|
}
|
|
tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
|
|
more_dirs = fxdr_unsigned(int, *tl);
|
|
}
|
|
/*
|
|
* If at end of rpc data, get the eof boolean
|
|
*/
|
|
if (!more_dirs) {
|
|
tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
|
|
more_dirs = (fxdr_unsigned(int, *tl) == 0);
|
|
}
|
|
m_freem(mrep);
|
|
}
|
|
/*
|
|
* Fill last record, iff any, out to a multiple of DIRBLKSIZ
|
|
* by increasing d_reclen for the last record.
|
|
*/
|
|
if (blksiz > 0) {
|
|
left = DIRBLKSIZ - blksiz;
|
|
dp->d_reclen += left;
|
|
uiop->uio_iov->iov_base =
|
|
(char *)uiop->uio_iov->iov_base + left;
|
|
uiop->uio_iov->iov_len -= left;
|
|
uiop->uio_offset += left;
|
|
uiop->uio_resid -= left;
|
|
}
|
|
|
|
/*
|
|
* We are now either at the end of the directory or have filled the
|
|
* block.
|
|
*/
|
|
if (bigenough)
|
|
dnp->n_direofoffset = uiop->uio_offset;
|
|
else {
|
|
if (uiop->uio_resid > 0)
|
|
nfs_printf("EEK! readdirplusrpc resid > 0\n");
|
|
nfs_dircookie_lock(dnp);
|
|
cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1);
|
|
*cookiep = cookie;
|
|
nfs_dircookie_unlock(dnp);
|
|
}
|
|
nfsmout:
|
|
if (newvp != NULLVP) {
|
|
if (newvp == vp)
|
|
vrele(newvp);
|
|
else
|
|
vput(newvp);
|
|
newvp = NULLVP;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Silly rename. To make the NFS filesystem that is stateless look a little
|
|
* more like the "ufs" a remove of an active vnode is translated to a rename
|
|
* to a funny looking filename that is removed by nfs_inactive on the
|
|
* nfsnode. There is the potential for another process on a different client
|
|
* to create the same funny name between the nfs_lookitup() fails and the
|
|
* nfs_rename() completes, but...
|
|
*/
|
|
static int
|
|
nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
|
|
{
|
|
struct sillyrename *sp;
|
|
struct nfsnode *np;
|
|
int error;
|
|
short pid;
|
|
unsigned int lticks;
|
|
|
|
cache_purge(dvp);
|
|
np = VTONFS(vp);
|
|
#ifndef DIAGNOSTIC
|
|
if (vp->v_type == VDIR)
|
|
panic("nfs: sillyrename dir");
|
|
#endif
|
|
sp = malloc(sizeof (struct sillyrename),
|
|
M_NFSREQ, M_WAITOK);
|
|
sp->s_cred = crhold(cnp->cn_cred);
|
|
sp->s_dvp = dvp;
|
|
sp->s_removeit = nfs_removeit;
|
|
VREF(dvp);
|
|
|
|
/*
|
|
* Fudge together a funny name.
|
|
* Changing the format of the funny name to accomodate more
|
|
* sillynames per directory.
|
|
* The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is
|
|
* CPU ticks since boot.
|
|
*/
|
|
pid = cnp->cn_thread->td_proc->p_pid;
|
|
lticks = (unsigned int)ticks;
|
|
for ( ; ; ) {
|
|
sp->s_namlen = sprintf(sp->s_name,
|
|
".nfs.%08x.%04x4.4", lticks,
|
|
pid);
|
|
if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
|
|
cnp->cn_thread, NULL))
|
|
break;
|
|
lticks++;
|
|
}
|
|
error = nfs_renameit(dvp, cnp, sp);
|
|
if (error)
|
|
goto bad;
|
|
error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
|
|
cnp->cn_thread, &np);
|
|
np->n_sillyrename = sp;
|
|
return (0);
|
|
bad:
|
|
vrele(sp->s_dvp);
|
|
crfree(sp->s_cred);
|
|
free((caddr_t)sp, M_NFSREQ);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Look up a file name and optionally either update the file handle or
|
|
* allocate an nfsnode, depending on the value of npp.
|
|
* npp == NULL --> just do the lookup
|
|
* *npp == NULL --> allocate a new nfsnode and make sure attributes are
|
|
* handled too
|
|
* *npp != NULL --> update the file handle in the vnode
|
|
*/
|
|
static int
|
|
nfs_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred,
|
|
struct thread *td, struct nfsnode **npp)
|
|
{
|
|
struct vnode *newvp = NULL;
|
|
struct nfsnode *np, *dnp = VTONFS(dvp);
|
|
caddr_t bpos, dpos;
|
|
int error = 0, fhlen, attrflag;
|
|
struct mbuf *mreq, *mrep, *md, *mb;
|
|
nfsfh_t *nfhp;
|
|
int v3 = NFS_ISV3(dvp);
|
|
|
|
nfsstats.rpccnt[NFSPROC_LOOKUP]++;
|
|
mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP,
|
|
NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len));
|
|
mb = mreq;
|
|
bpos = mtod(mb, caddr_t);
|
|
nfsm_fhtom(dvp, v3);
|
|
nfsm_strtom(name, len, NFS_MAXNAMLEN);
|
|
nfsm_request(dvp, NFSPROC_LOOKUP, td, cred);
|
|
if (npp && !error) {
|
|
nfsm_getfh(nfhp, fhlen, v3);
|
|
if (*npp) {
|
|
np = *npp;
|
|
if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) {
|
|
free((caddr_t)np->n_fhp, M_NFSBIGFH);
|
|
np->n_fhp = &np->n_fh;
|
|
} else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH)
|
|
np->n_fhp =(nfsfh_t *)malloc(fhlen, M_NFSBIGFH, M_WAITOK);
|
|
bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen);
|
|
np->n_fhsize = fhlen;
|
|
newvp = NFSTOV(np);
|
|
} else if (NFS_CMPFH(dnp, nfhp, fhlen)) {
|
|
VREF(dvp);
|
|
newvp = dvp;
|
|
} else {
|
|
error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np, LK_EXCLUSIVE);
|
|
if (error) {
|
|
m_freem(mrep);
|
|
return (error);
|
|
}
|
|
newvp = NFSTOV(np);
|
|
}
|
|
if (v3) {
|
|
nfsm_postop_attr(newvp, attrflag);
|
|
if (!attrflag && *npp == NULL) {
|
|
m_freem(mrep);
|
|
if (newvp == dvp)
|
|
vrele(newvp);
|
|
else
|
|
vput(newvp);
|
|
return (ENOENT);
|
|
}
|
|
} else
|
|
nfsm_loadattr(newvp, NULL);
|
|
}
|
|
m_freem(mrep);
|
|
nfsmout:
|
|
if (npp && *npp == NULL) {
|
|
if (error) {
|
|
if (newvp) {
|
|
if (newvp == dvp)
|
|
vrele(newvp);
|
|
else
|
|
vput(newvp);
|
|
}
|
|
} else
|
|
*npp = np;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Nfs Version 3 commit rpc
|
|
*/
|
|
int
|
|
nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
|
|
struct thread *td)
|
|
{
|
|
u_int32_t *tl;
|
|
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
|
|
caddr_t bpos, dpos;
|
|
int error = 0, wccflag = NFSV3_WCCRATTR;
|
|
struct mbuf *mreq, *mrep, *md, *mb;
|
|
|
|
mtx_lock(&nmp->nm_mtx);
|
|
if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
return (0);
|
|
}
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
nfsstats.rpccnt[NFSPROC_COMMIT]++;
|
|
mreq = nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1));
|
|
mb = mreq;
|
|
bpos = mtod(mb, caddr_t);
|
|
nfsm_fhtom(vp, 1);
|
|
tl = nfsm_build(u_int32_t *, 3 * NFSX_UNSIGNED);
|
|
txdr_hyper(offset, tl);
|
|
tl += 2;
|
|
*tl = txdr_unsigned(cnt);
|
|
nfsm_request(vp, NFSPROC_COMMIT, td, cred);
|
|
nfsm_wcc_data(vp, wccflag);
|
|
if (!error) {
|
|
tl = nfsm_dissect(u_int32_t *, NFSX_V3WRITEVERF);
|
|
if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl,
|
|
NFSX_V3WRITEVERF)) {
|
|
bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf,
|
|
NFSX_V3WRITEVERF);
|
|
error = NFSERR_STALEWRITEVERF;
|
|
}
|
|
}
|
|
m_freem(mrep);
|
|
nfsmout:
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Strategy routine.
|
|
* For async requests when nfsiod(s) are running, queue the request by
|
|
* calling nfs_asyncio(), otherwise just all nfs_doio() to do the
|
|
* request.
|
|
*/
|
|
static int
|
|
nfs_strategy(struct vop_strategy_args *ap)
|
|
{
|
|
struct buf *bp = ap->a_bp;
|
|
struct ucred *cr;
|
|
|
|
KASSERT(!(bp->b_flags & B_DONE),
|
|
("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
|
|
BUF_ASSERT_HELD(bp);
|
|
|
|
if (bp->b_iocmd == BIO_READ)
|
|
cr = bp->b_rcred;
|
|
else
|
|
cr = bp->b_wcred;
|
|
|
|
/*
|
|
* If the op is asynchronous and an i/o daemon is waiting
|
|
* queue the request, wake it up and wait for completion
|
|
* otherwise just do it ourselves.
|
|
*/
|
|
if ((bp->b_flags & B_ASYNC) == 0 ||
|
|
nfs_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread))
|
|
(void)nfs_doio(ap->a_vp, bp, cr, curthread);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* fsync vnode op. Just call nfs_flush() with commit == 1.
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
nfs_fsync(struct vop_fsync_args *ap)
|
|
{
|
|
|
|
return (nfs_flush(ap->a_vp, ap->a_waitfor, 1));
|
|
}
|
|
|
|
/*
|
|
* Flush all the blocks associated with a vnode.
|
|
* Walk through the buffer pool and push any dirty pages
|
|
* associated with the vnode.
|
|
*/
|
|
static int
|
|
nfs_flush(struct vnode *vp, int waitfor, int commit)
|
|
{
|
|
struct nfsnode *np = VTONFS(vp);
|
|
struct buf *bp;
|
|
int i;
|
|
struct buf *nbp;
|
|
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
|
|
int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
|
|
int passone = 1;
|
|
u_quad_t off, endoff, toff;
|
|
struct ucred* wcred = NULL;
|
|
struct buf **bvec = NULL;
|
|
struct bufobj *bo;
|
|
struct thread *td = curthread;
|
|
#ifndef NFS_COMMITBVECSIZ
|
|
#define NFS_COMMITBVECSIZ 20
|
|
#endif
|
|
struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
|
|
int bvecsize = 0, bveccount;
|
|
|
|
if (nmp->nm_flag & NFSMNT_INT)
|
|
slpflag = NFS_PCATCH;
|
|
if (!commit)
|
|
passone = 0;
|
|
bo = &vp->v_bufobj;
|
|
/*
|
|
* A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
|
|
* server, but has not been committed to stable storage on the server
|
|
* yet. On the first pass, the byte range is worked out and the commit
|
|
* rpc is done. On the second pass, nfs_writebp() is called to do the
|
|
* job.
|
|
*/
|
|
again:
|
|
off = (u_quad_t)-1;
|
|
endoff = 0;
|
|
bvecpos = 0;
|
|
if (NFS_ISV3(vp) && commit) {
|
|
if (bvec != NULL && bvec != bvec_on_stack)
|
|
free(bvec, M_TEMP);
|
|
/*
|
|
* Count up how many buffers waiting for a commit.
|
|
*/
|
|
bveccount = 0;
|
|
BO_LOCK(bo);
|
|
TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
|
|
if (!BUF_ISLOCKED(bp) &&
|
|
(bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
|
|
== (B_DELWRI | B_NEEDCOMMIT))
|
|
bveccount++;
|
|
}
|
|
/*
|
|
* Allocate space to remember the list of bufs to commit. It is
|
|
* important to use M_NOWAIT here to avoid a race with nfs_write.
|
|
* If we can't get memory (for whatever reason), we will end up
|
|
* committing the buffers one-by-one in the loop below.
|
|
*/
|
|
if (bveccount > NFS_COMMITBVECSIZ) {
|
|
/*
|
|
* Release the vnode interlock to avoid a lock
|
|
* order reversal.
|
|
*/
|
|
BO_UNLOCK(bo);
|
|
bvec = (struct buf **)
|
|
malloc(bveccount * sizeof(struct buf *),
|
|
M_TEMP, M_NOWAIT);
|
|
BO_LOCK(bo);
|
|
if (bvec == NULL) {
|
|
bvec = bvec_on_stack;
|
|
bvecsize = NFS_COMMITBVECSIZ;
|
|
} else
|
|
bvecsize = bveccount;
|
|
} else {
|
|
bvec = bvec_on_stack;
|
|
bvecsize = NFS_COMMITBVECSIZ;
|
|
}
|
|
TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
|
|
if (bvecpos >= bvecsize)
|
|
break;
|
|
if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
|
|
nbp = TAILQ_NEXT(bp, b_bobufs);
|
|
continue;
|
|
}
|
|
if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
|
|
(B_DELWRI | B_NEEDCOMMIT)) {
|
|
BUF_UNLOCK(bp);
|
|
nbp = TAILQ_NEXT(bp, b_bobufs);
|
|
continue;
|
|
}
|
|
BO_UNLOCK(bo);
|
|
bremfree(bp);
|
|
/*
|
|
* Work out if all buffers are using the same cred
|
|
* so we can deal with them all with one commit.
|
|
*
|
|
* NOTE: we are not clearing B_DONE here, so we have
|
|
* to do it later on in this routine if we intend to
|
|
* initiate I/O on the bp.
|
|
*
|
|
* Note: to avoid loopback deadlocks, we do not
|
|
* assign b_runningbufspace.
|
|
*/
|
|
if (wcred == NULL)
|
|
wcred = bp->b_wcred;
|
|
else if (wcred != bp->b_wcred)
|
|
wcred = NOCRED;
|
|
vfs_busy_pages(bp, 1);
|
|
|
|
BO_LOCK(bo);
|
|
/*
|
|
* bp is protected by being locked, but nbp is not
|
|
* and vfs_busy_pages() may sleep. We have to
|
|
* recalculate nbp.
|
|
*/
|
|
nbp = TAILQ_NEXT(bp, b_bobufs);
|
|
|
|
/*
|
|
* A list of these buffers is kept so that the
|
|
* second loop knows which buffers have actually
|
|
* been committed. This is necessary, since there
|
|
* may be a race between the commit rpc and new
|
|
* uncommitted writes on the file.
|
|
*/
|
|
bvec[bvecpos++] = bp;
|
|
toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
|
|
bp->b_dirtyoff;
|
|
if (toff < off)
|
|
off = toff;
|
|
toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
|
|
if (toff > endoff)
|
|
endoff = toff;
|
|
}
|
|
BO_UNLOCK(bo);
|
|
}
|
|
if (bvecpos > 0) {
|
|
/*
|
|
* Commit data on the server, as required.
|
|
* If all bufs are using the same wcred, then use that with
|
|
* one call for all of them, otherwise commit each one
|
|
* separately.
|
|
*/
|
|
if (wcred != NOCRED)
|
|
retv = nfs_commit(vp, off, (int)(endoff - off),
|
|
wcred, td);
|
|
else {
|
|
retv = 0;
|
|
for (i = 0; i < bvecpos; i++) {
|
|
off_t off, size;
|
|
bp = bvec[i];
|
|
off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
|
|
bp->b_dirtyoff;
|
|
size = (u_quad_t)(bp->b_dirtyend
|
|
- bp->b_dirtyoff);
|
|
retv = nfs_commit(vp, off, (int)size,
|
|
bp->b_wcred, td);
|
|
if (retv) break;
|
|
}
|
|
}
|
|
|
|
if (retv == NFSERR_STALEWRITEVERF)
|
|
nfs_clearcommit(vp->v_mount);
|
|
|
|
/*
|
|
* Now, either mark the blocks I/O done or mark the
|
|
* blocks dirty, depending on whether the commit
|
|
* succeeded.
|
|
*/
|
|
for (i = 0; i < bvecpos; i++) {
|
|
bp = bvec[i];
|
|
bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
|
|
if (retv) {
|
|
/*
|
|
* Error, leave B_DELWRI intact
|
|
*/
|
|
vfs_unbusy_pages(bp);
|
|
brelse(bp);
|
|
} else {
|
|
/*
|
|
* Success, remove B_DELWRI ( bundirty() ).
|
|
*
|
|
* b_dirtyoff/b_dirtyend seem to be NFS
|
|
* specific. We should probably move that
|
|
* into bundirty(). XXX
|
|
*/
|
|
bufobj_wref(bo);
|
|
bp->b_flags |= B_ASYNC;
|
|
bundirty(bp);
|
|
bp->b_flags &= ~B_DONE;
|
|
bp->b_ioflags &= ~BIO_ERROR;
|
|
bp->b_dirtyoff = bp->b_dirtyend = 0;
|
|
bufdone(bp);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Start/do any write(s) that are required.
|
|
*/
|
|
loop:
|
|
BO_LOCK(bo);
|
|
TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
|
|
if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
|
|
if (waitfor != MNT_WAIT || passone)
|
|
continue;
|
|
|
|
error = BUF_TIMELOCK(bp,
|
|
LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
|
|
BO_MTX(bo), "nfsfsync", slpflag, slptimeo);
|
|
if (error == 0) {
|
|
BUF_UNLOCK(bp);
|
|
goto loop;
|
|
}
|
|
if (error == ENOLCK) {
|
|
error = 0;
|
|
goto loop;
|
|
}
|
|
if (nfs_sigintr(nmp, td)) {
|
|
error = EINTR;
|
|
goto done;
|
|
}
|
|
if (slpflag & PCATCH) {
|
|
slpflag = 0;
|
|
slptimeo = 2 * hz;
|
|
}
|
|
goto loop;
|
|
}
|
|
if ((bp->b_flags & B_DELWRI) == 0)
|
|
panic("nfs_fsync: not dirty");
|
|
if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
|
|
BUF_UNLOCK(bp);
|
|
continue;
|
|
}
|
|
BO_UNLOCK(bo);
|
|
bremfree(bp);
|
|
if (passone || !commit)
|
|
bp->b_flags |= B_ASYNC;
|
|
else
|
|
bp->b_flags |= B_ASYNC;
|
|
bwrite(bp);
|
|
if (nfs_sigintr(nmp, td)) {
|
|
error = EINTR;
|
|
goto done;
|
|
}
|
|
goto loop;
|
|
}
|
|
if (passone) {
|
|
passone = 0;
|
|
BO_UNLOCK(bo);
|
|
goto again;
|
|
}
|
|
if (waitfor == MNT_WAIT) {
|
|
while (bo->bo_numoutput) {
|
|
error = bufobj_wwait(bo, slpflag, slptimeo);
|
|
if (error) {
|
|
BO_UNLOCK(bo);
|
|
error = nfs_sigintr(nmp, td);
|
|
if (error)
|
|
goto done;
|
|
if (slpflag & PCATCH) {
|
|
slpflag = 0;
|
|
slptimeo = 2 * hz;
|
|
}
|
|
BO_LOCK(bo);
|
|
}
|
|
}
|
|
if (bo->bo_dirty.bv_cnt != 0 && commit) {
|
|
BO_UNLOCK(bo);
|
|
goto loop;
|
|
}
|
|
/*
|
|
* Wait for all the async IO requests to drain
|
|
*/
|
|
BO_UNLOCK(bo);
|
|
mtx_lock(&np->n_mtx);
|
|
while (np->n_directio_asyncwr > 0) {
|
|
np->n_flag |= NFSYNCWAIT;
|
|
error = nfs_msleep(td, (caddr_t)&np->n_directio_asyncwr,
|
|
&np->n_mtx, slpflag | (PRIBIO + 1),
|
|
"nfsfsync", 0);
|
|
if (error) {
|
|
if (nfs_sigintr(nmp, td)) {
|
|
mtx_unlock(&np->n_mtx);
|
|
error = EINTR;
|
|
goto done;
|
|
}
|
|
}
|
|
}
|
|
mtx_unlock(&np->n_mtx);
|
|
} else
|
|
BO_UNLOCK(bo);
|
|
mtx_lock(&np->n_mtx);
|
|
if (np->n_flag & NWRITEERR) {
|
|
error = np->n_error;
|
|
np->n_flag &= ~NWRITEERR;
|
|
}
|
|
if (commit && bo->bo_dirty.bv_cnt == 0 &&
|
|
bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0)
|
|
np->n_flag &= ~NMODIFIED;
|
|
mtx_unlock(&np->n_mtx);
|
|
done:
|
|
if (bvec != NULL && bvec != bvec_on_stack)
|
|
free(bvec, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* NFS advisory byte-level locks.
|
|
*/
|
|
static int
|
|
nfs_advlock(struct vop_advlock_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
u_quad_t size;
|
|
int error;
|
|
|
|
error = vn_lock(vp, LK_SHARED);
|
|
if (error)
|
|
return (error);
|
|
if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
|
|
size = VTONFS(vp)->n_size;
|
|
VOP_UNLOCK(vp, 0);
|
|
error = lf_advlock(ap, &(vp->v_lockf), size);
|
|
} else {
|
|
if (nfs_advlock_p)
|
|
error = nfs_advlock_p(ap);
|
|
else
|
|
error = ENOLCK;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* NFS advisory byte-level locks.
|
|
*/
|
|
static int
|
|
nfs_advlockasync(struct vop_advlockasync_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
u_quad_t size;
|
|
int error;
|
|
|
|
error = vn_lock(vp, LK_SHARED);
|
|
if (error)
|
|
return (error);
|
|
if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
|
|
size = VTONFS(vp)->n_size;
|
|
VOP_UNLOCK(vp, 0);
|
|
error = lf_advlockasync(ap, &(vp->v_lockf), size);
|
|
} else {
|
|
VOP_UNLOCK(vp, 0);
|
|
error = EOPNOTSUPP;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Print out the contents of an nfsnode.
|
|
*/
|
|
static int
|
|
nfs_print(struct vop_print_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct nfsnode *np = VTONFS(vp);
|
|
|
|
nfs_printf("\tfileid %ld fsid 0x%x",
|
|
np->n_vattr.va_fileid, np->n_vattr.va_fsid);
|
|
if (vp->v_type == VFIFO)
|
|
fifo_printinfo(vp);
|
|
printf("\n");
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* This is the "real" nfs::bwrite(struct buf*).
|
|
* We set B_CACHE if this is a VMIO buffer.
|
|
*/
|
|
int
|
|
nfs_writebp(struct buf *bp, int force __unused, struct thread *td)
|
|
{
|
|
int s;
|
|
int oldflags = bp->b_flags;
|
|
#if 0
|
|
int retv = 1;
|
|
off_t off;
|
|
#endif
|
|
|
|
BUF_ASSERT_HELD(bp);
|
|
|
|
if (bp->b_flags & B_INVAL) {
|
|
brelse(bp);
|
|
return(0);
|
|
}
|
|
|
|
bp->b_flags |= B_CACHE;
|
|
|
|
/*
|
|
* Undirty the bp. We will redirty it later if the I/O fails.
|
|
*/
|
|
|
|
s = splbio();
|
|
bundirty(bp);
|
|
bp->b_flags &= ~B_DONE;
|
|
bp->b_ioflags &= ~BIO_ERROR;
|
|
bp->b_iocmd = BIO_WRITE;
|
|
|
|
bufobj_wref(bp->b_bufobj);
|
|
curthread->td_ru.ru_oublock++;
|
|
splx(s);
|
|
|
|
/*
|
|
* Note: to avoid loopback deadlocks, we do not
|
|
* assign b_runningbufspace.
|
|
*/
|
|
vfs_busy_pages(bp, 1);
|
|
|
|
BUF_KERNPROC(bp);
|
|
bp->b_iooffset = dbtob(bp->b_blkno);
|
|
bstrategy(bp);
|
|
|
|
if( (oldflags & B_ASYNC) == 0) {
|
|
int rtval = bufwait(bp);
|
|
|
|
if (oldflags & B_DELWRI) {
|
|
s = splbio();
|
|
reassignbuf(bp);
|
|
splx(s);
|
|
}
|
|
brelse(bp);
|
|
return (rtval);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* nfs special file access vnode op.
|
|
* Essentially just get vattr and then imitate iaccess() since the device is
|
|
* local to the client.
|
|
*/
|
|
static int
|
|
nfsspec_access(struct vop_access_args *ap)
|
|
{
|
|
struct vattr *vap;
|
|
struct ucred *cred = ap->a_cred;
|
|
struct vnode *vp = ap->a_vp;
|
|
accmode_t accmode = ap->a_accmode;
|
|
struct vattr vattr;
|
|
int error;
|
|
|
|
/*
|
|
* Disallow write attempts on filesystems mounted read-only;
|
|
* unless the file is a socket, fifo, or a block or character
|
|
* device resident on the filesystem.
|
|
*/
|
|
if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
|
|
switch (vp->v_type) {
|
|
case VREG:
|
|
case VDIR:
|
|
case VLNK:
|
|
return (EROFS);
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
vap = &vattr;
|
|
error = VOP_GETATTR(vp, vap, cred);
|
|
if (error)
|
|
goto out;
|
|
error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
|
|
accmode, cred, NULL);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Read wrapper for fifos.
|
|
*/
|
|
static int
|
|
nfsfifo_read(struct vop_read_args *ap)
|
|
{
|
|
struct nfsnode *np = VTONFS(ap->a_vp);
|
|
int error;
|
|
|
|
/*
|
|
* Set access flag.
|
|
*/
|
|
mtx_lock(&np->n_mtx);
|
|
np->n_flag |= NACC;
|
|
getnanotime(&np->n_atim);
|
|
mtx_unlock(&np->n_mtx);
|
|
error = fifo_specops.vop_read(ap);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Write wrapper for fifos.
|
|
*/
|
|
static int
|
|
nfsfifo_write(struct vop_write_args *ap)
|
|
{
|
|
struct nfsnode *np = VTONFS(ap->a_vp);
|
|
|
|
/*
|
|
* Set update flag.
|
|
*/
|
|
mtx_lock(&np->n_mtx);
|
|
np->n_flag |= NUPD;
|
|
getnanotime(&np->n_mtim);
|
|
mtx_unlock(&np->n_mtx);
|
|
return(fifo_specops.vop_write(ap));
|
|
}
|
|
|
|
/*
|
|
* Close wrapper for fifos.
|
|
*
|
|
* Update the times on the nfsnode then do fifo close.
|
|
*/
|
|
static int
|
|
nfsfifo_close(struct vop_close_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct nfsnode *np = VTONFS(vp);
|
|
struct vattr vattr;
|
|
struct timespec ts;
|
|
|
|
mtx_lock(&np->n_mtx);
|
|
if (np->n_flag & (NACC | NUPD)) {
|
|
getnanotime(&ts);
|
|
if (np->n_flag & NACC)
|
|
np->n_atim = ts;
|
|
if (np->n_flag & NUPD)
|
|
np->n_mtim = ts;
|
|
np->n_flag |= NCHG;
|
|
if (vrefcnt(vp) == 1 &&
|
|
(vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
|
|
VATTR_NULL(&vattr);
|
|
if (np->n_flag & NACC)
|
|
vattr.va_atime = np->n_atim;
|
|
if (np->n_flag & NUPD)
|
|
vattr.va_mtime = np->n_mtim;
|
|
mtx_unlock(&np->n_mtx);
|
|
(void)VOP_SETATTR(vp, &vattr, ap->a_cred);
|
|
goto out;
|
|
}
|
|
}
|
|
mtx_unlock(&np->n_mtx);
|
|
out:
|
|
return (fifo_specops.vop_close(ap));
|
|
}
|
|
|
|
/*
|
|
* Just call nfs_writebp() with the force argument set to 1.
|
|
*
|
|
* NOTE: B_DONE may or may not be set in a_bp on call.
|
|
*/
|
|
static int
|
|
nfs_bwrite(struct buf *bp)
|
|
{
|
|
|
|
return (nfs_writebp(bp, 1, curthread));
|
|
}
|
|
|
|
struct buf_ops buf_ops_nfs = {
|
|
.bop_name = "buf_ops_nfs",
|
|
.bop_write = nfs_bwrite,
|
|
.bop_strategy = bufstrategy,
|
|
.bop_sync = bufsync,
|
|
.bop_bdflush = bufbdflush,
|
|
};
|