651ff543f8
Without this patch it was possible for a different thread that calls nfs_asyncio() to snitch a newly created nfsiod thread that was intended for another caller of nfs_asyncio(), because the nfs_iod_mtx mutex was unlocked while the new nfsiod thread was created. This patch labels the newly created nfsiod, so that it is not taken by another caller of nfs_asyncio(). This is believed to fix the problem reported on the freebsd-stable email list under the subject: FreeBSD NFS client/Linux NFS server issue. Tested by: to DOT my DOT trociny AT gmail DOT com Reviewed by: jhb MFC after: 2 weeks
232 lines
8.1 KiB
C
232 lines
8.1 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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* @(#)nfsnode.h 8.9 (Berkeley) 5/14/95
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* $FreeBSD$
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*/
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#ifndef _NFSCLIENT_NFSNODE_H_
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#define _NFSCLIENT_NFSNODE_H_
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#if !defined(_NFSCLIENT_NFS_H_) && !defined(_KERNEL)
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#include <nfs/nfs.h>
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#endif
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/*
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* Silly rename structure that hangs off the nfsnode until the name
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* can be removed by nfs_inactive()
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*/
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struct sillyrename {
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struct ucred *s_cred;
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struct vnode *s_dvp;
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int (*s_removeit)(struct sillyrename *sp);
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long s_namlen;
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char s_name[32];
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};
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/*
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* This structure is used to save the logical directory offset to
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* NFS cookie mappings.
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* The mappings are stored in a list headed
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* by n_cookies, as required.
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* There is one mapping for each NFS_DIRBLKSIZ bytes of directory information
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* stored in increasing logical offset byte order.
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*/
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#define NFSNUMCOOKIES 31
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struct nfsdmap {
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LIST_ENTRY(nfsdmap) ndm_list;
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int ndm_eocookie;
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union {
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nfsuint64 ndmu3_cookies[NFSNUMCOOKIES];
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uint64_t ndmu4_cookies[NFSNUMCOOKIES];
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} ndm_un1;
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};
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#define ndm_cookies ndm_un1.ndmu3_cookies
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#define ndm4_cookies ndm_un1.ndmu4_cookies
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#define n_ac_ts_tid n_ac_ts.nfs_ac_ts_tid
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#define n_ac_ts_pid n_ac_ts.nfs_ac_ts_pid
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#define n_ac_ts_syscalls n_ac_ts.nfs_ac_ts_syscalls
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struct nfs_attrcache_timestamp {
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lwpid_t nfs_ac_ts_tid;
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pid_t nfs_ac_ts_pid;
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unsigned long nfs_ac_ts_syscalls;
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};
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struct nfs_accesscache {
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u_int32_t mode; /* ACCESS mode cache */
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uid_t uid; /* credentials having mode */
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time_t stamp; /* mode cache timestamp */
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};
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/*
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* The nfsnode is the nfs equivalent to ufs's inode. Any similarity
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* is purely coincidental.
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* There is a unique nfsnode allocated for each active file,
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* each current directory, each mounted-on file, text file, and the root.
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* An nfsnode is 'named' by its file handle. (nget/nfs_node.c)
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* If this structure exceeds 256 bytes (it is currently 256 using 4.4BSD-Lite
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* type definitions), file handles of > 32 bytes should probably be split out
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* into a separate MALLOC()'d data structure. (Reduce the size of nfsfh_t by
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* changing the definition in nfsproto.h of NFS_SMALLFH.)
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* NB: Hopefully the current order of the fields is such that everything will
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* be well aligned and, therefore, tightly packed.
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*/
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struct nfsnode {
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struct mtx n_mtx; /* Protects all of these members */
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u_quad_t n_size; /* Current size of file */
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u_quad_t n_brev; /* Modify rev when cached */
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u_quad_t n_lrev; /* Modify rev for lease */
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struct vattr n_vattr; /* Vnode attribute cache */
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time_t n_attrstamp; /* Attr. cache timestamp */
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struct nfs_accesscache n_accesscache[NFS_ACCESSCACHESIZE];
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struct timespec n_mtime; /* Prev modify time. */
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time_t n_ctime; /* Prev create time. */
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time_t n_dmtime; /* Prev dir modify time. */
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int n_dmtime_ticks; /* Tick of -ve cache entry */
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time_t n_expiry; /* Lease expiry time */
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nfsfh_t *n_fhp; /* NFS File Handle */
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struct vnode *n_vnode; /* associated vnode */
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struct vnode *n_dvp; /* parent vnode */
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int n_error; /* Save write error value */
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union {
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struct timespec nf_atim; /* Special file times */
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nfsuint64 nd_cookieverf; /* Cookie verifier (dir only) */
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u_char nd4_cookieverf[NFSX_V4VERF];
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} n_un1;
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union {
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struct timespec nf_mtim;
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off_t nd_direof; /* Dir. EOF offset cache */
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} n_un2;
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union {
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struct sillyrename *nf_silly; /* Ptr to silly rename struct */
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LIST_HEAD(, nfsdmap) nd_cook; /* cookies */
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} n_un3;
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short n_fhsize; /* size in bytes, of fh */
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short n_flag; /* Flag for locking.. */
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nfsfh_t n_fh; /* Small File Handle */
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u_char *n_name; /* leaf name, for v4 OPEN op */
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uint32_t n_namelen;
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int n_directio_opens;
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int n_directio_asyncwr;
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struct nfs_attrcache_timestamp n_ac_ts;
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};
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#define n_atim n_un1.nf_atim
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#define n_mtim n_un2.nf_mtim
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#define n_sillyrename n_un3.nf_silly
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#define n_cookieverf n_un1.nd_cookieverf
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#define n4_cookieverf n_un1.nd4_cookieverf
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#define n_direofoffset n_un2.nd_direof
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#define n_cookies n_un3.nd_cook
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/*
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* Flags for n_flag
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*/
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#define NFSYNCWAIT 0x0002 /* fsync waiting for all directio async writes
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to drain */
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#define NMODIFIED 0x0004 /* Might have a modified buffer in bio */
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#define NWRITEERR 0x0008 /* Flag write errors so close will know */
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/* 0x20, 0x40, 0x80 free */
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#define NACC 0x0100 /* Special file accessed */
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#define NUPD 0x0200 /* Special file updated */
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#define NCHG 0x0400 /* Special file times changed */
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#define NCREATED 0x0800 /* Opened by nfs_create() */
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#define NTRUNCATE 0x1000 /* Opened by nfs_setattr() */
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#define NSIZECHANGED 0x2000 /* File size has changed: need cache inval */
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#define NNONCACHE 0x4000 /* Node marked as noncacheable */
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#define NDIRCOOKIELK 0x8000 /* Lock to serialize access to directory cookies */
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/*
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* Convert between nfsnode pointers and vnode pointers
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*/
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#define VTONFS(vp) ((struct nfsnode *)(vp)->v_data)
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#define NFSTOV(np) ((struct vnode *)(np)->n_vnode)
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#define NFS_TIMESPEC_COMPARE(T1, T2) (((T1)->tv_sec != (T2)->tv_sec) || ((T1)->tv_nsec != (T2)->tv_nsec))
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/*
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* NFS iod threads can be in one of these three states once spawned.
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* NFSIOD_NOT_AVAILABLE - Cannot be assigned an I/O operation at this time.
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* NFSIOD_AVAILABLE - Available to be assigned an I/O operation.
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* NFSIOD_CREATED_FOR_NFS_ASYNCIO - Newly created for nfs_asyncio() and
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* will be used by the thread that called nfs_asyncio().
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*/
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enum nfsiod_state {
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NFSIOD_NOT_AVAILABLE = 0,
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NFSIOD_AVAILABLE = 1,
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NFSIOD_CREATED_FOR_NFS_ASYNCIO = 2,
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};
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/*
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* Queue head for nfsiod's
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*/
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extern TAILQ_HEAD(nfs_bufq, buf) nfs_bufq;
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extern enum nfsiod_state nfs_iodwant[NFS_MAXASYNCDAEMON];
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extern struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON];
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#if defined(_KERNEL)
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extern struct vop_vector nfs_fifoops;
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extern struct vop_vector nfs_vnodeops;
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extern struct buf_ops buf_ops_nfs;
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extern vop_advlock_t *nfs_advlock_p;
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extern vop_reclaim_t *nfs_reclaim_p;
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/*
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* Prototypes for NFS vnode operations
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*/
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int nfs_getpages(struct vop_getpages_args *);
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int nfs_putpages(struct vop_putpages_args *);
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int nfs_write(struct vop_write_args *);
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int nfs_inactive(struct vop_inactive_args *);
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int nfs_reclaim(struct vop_reclaim_args *);
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/* other stuff */
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int nfs_removeit(struct sillyrename *);
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int nfs_nget(struct mount *, nfsfh_t *, int, struct nfsnode **, int flags);
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nfsuint64 *nfs_getcookie(struct nfsnode *, off_t, int);
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void nfs_invaldir(struct vnode *);
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int nfs_upgrade_vnlock(struct vnode *vp);
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void nfs_downgrade_vnlock(struct vnode *vp, int old_lock);
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void nfs_printf(const char *fmt, ...);
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void nfs_dircookie_lock(struct nfsnode *np);
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void nfs_dircookie_unlock(struct nfsnode *np);
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#endif /* _KERNEL */
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#endif
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