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Diffstat (limited to 'sys/nfs/nqnfs.h')
| -rw-r--r-- | sys/nfs/nqnfs.h | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/sys/nfs/nqnfs.h b/sys/nfs/nqnfs.h new file mode 100644 index 0000000..730741a --- /dev/null +++ b/sys/nfs/nqnfs.h @@ -0,0 +1,198 @@ +/* + * Copyright (c) 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Rick Macklem at The University of Guelph. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)nqnfs.h 8.1 (Berkeley) 6/10/93 + */ + +/* + * Definitions for NQNFS (Not Quite NFS) cache consistency protocol. + */ + +/* Tunable constants */ +#define NQ_CLOCKSKEW 3 /* Clock skew factor (sec) */ +#define NQ_WRITESLACK 5 /* Delay for write cache flushing */ +#define NQ_MAXLEASE 60 /* Max lease duration (sec) */ +#define NQ_MINLEASE 5 /* Min lease duration (sec) */ +#define NQ_DEFLEASE 30 /* Default lease duration (sec) */ +#define NQ_RENEWAL 3 /* Time before expiry (sec) to renew */ +#define NQ_TRYLATERDEL 15 /* Initial try later delay (sec) */ +#define NQ_MAXNUMLEASE 2048 /* Upper bound on number of server leases */ +#define NQ_DEADTHRESH NQ_NEVERDEAD /* Default nm_deadthresh */ +#define NQ_NEVERDEAD 9 /* Greater than max. nm_timeouts */ +#define NQLCHSZ 256 /* Server hash table size */ + +#define NQNFS_PROG 300105 /* As assigned by Sun */ +#define NQNFS_VER1 1 +#define NQNFS_EVICTSIZ 156 /* Size of eviction request in bytes */ + +/* + * Definitions used for saving the "last lease expires" time in Non-volatile + * RAM on the server. The default definitions below assume that NOVRAM is not + * available. + */ +#define NQSTORENOVRAM(t) +#define NQLOADNOVRAM(t) + +/* + * Defn and structs used on the server to maintain state for current leases. + * The list of host(s) that hold the lease are kept as nqhost structures. + * The first one lives in nqlease and any others are held in a linked + * list of nqm structures hanging off of nqlease. + * + * Each nqlease structure is chained into two lists. The first is a list + * ordered by increasing expiry time for nqsrv_timer() and the second is a chain + * hashed on lc_fh. + */ +#define LC_MOREHOSTSIZ 10 + +struct nqhost { + union { + struct { + u_short udp_flag; + u_short udp_port; + union nethostaddr udp_haddr; + } un_udp; + struct { + u_short connless_flag; + u_short connless_spare; + union nethostaddr connless_haddr; + } un_connless; + struct { + u_short conn_flag; + u_short conn_spare; + struct nfssvc_sock *conn_slp; + } un_conn; + } lph_un; +}; +#define lph_flag lph_un.un_udp.udp_flag +#define lph_port lph_un.un_udp.udp_port +#define lph_haddr lph_un.un_udp.udp_haddr +#define lph_inetaddr lph_un.un_udp.udp_haddr.had_inetaddr +#define lph_claddr lph_un.un_connless.connless_haddr +#define lph_nam lph_un.un_connless.connless_haddr.had_nam +#define lph_slp lph_un.un_conn.conn_slp + +struct nqlease { + struct nqlease *lc_chain1[2]; /* Timer queue list (must be first) */ + struct nqlease *lc_fhnext; /* Fhandle hash list */ + struct nqlease **lc_fhprev; + time_t lc_expiry; /* Expiry time (sec) */ + struct nqhost lc_host; /* Host that got lease */ + struct nqm *lc_morehosts; /* Other hosts that share read lease */ + fsid_t lc_fsid; /* Fhandle */ + char lc_fiddata[MAXFIDSZ]; + struct vnode *lc_vp; /* Soft reference to associated vnode */ +}; +#define lc_flag lc_host.lph_un.un_udp.udp_flag + +/* lc_flag bits */ +#define LC_VALID 0x0001 /* Host address valid */ +#define LC_WRITE 0x0002 /* Write cache */ +#define LC_NONCACHABLE 0x0004 /* Non-cachable lease */ +#define LC_LOCKED 0x0008 /* Locked */ +#define LC_WANTED 0x0010 /* Lock wanted */ +#define LC_EXPIREDWANTED 0x0020 /* Want lease when expired */ +#define LC_UDP 0x0040 /* Host address for udp socket */ +#define LC_CLTP 0x0080 /* Host address for other connectionless */ +#define LC_LOCAL 0x0100 /* Host is server */ +#define LC_VACATED 0x0200 /* Host has vacated lease */ +#define LC_WRITTEN 0x0400 /* Recently wrote to the leased file */ +#define LC_SREF 0x0800 /* Holds a nfssvc_sock reference */ + +struct nqm { + struct nqm *lpm_next; + struct nqhost lpm_hosts[LC_MOREHOSTSIZ]; +}; + +/* + * Flag bits for flags argument to nqsrv_getlease. + */ +#define NQL_READ LEASE_READ /* Read Request */ +#define NQL_WRITE LEASE_WRITE /* Write Request */ +#define NQL_CHECK 0x4 /* Check for lease */ +#define NQL_NOVAL 0xffffffff /* Invalid */ + +/* + * Special value for slp for local server calls. + */ +#define NQLOCALSLP ((struct nfssvc_sock *) -1) + +/* + * Server side macros. + */ +#define nqsrv_getl(v, l) \ + (void) nqsrv_getlease((v), &nfsd->nd_duration, \ + ((nfsd->nd_nqlflag != 0 && nfsd->nd_nqlflag != NQL_NOVAL) ? nfsd->nd_nqlflag : \ + ((l) | NQL_CHECK)), \ + nfsd, nam, &cache, &frev, cred) + +/* + * Client side macros that check for a valid lease. + */ +#define NQNFS_CKINVALID(v, n, f) \ + ((time.tv_sec > (n)->n_expiry && \ + VFSTONFS((v)->v_mount)->nm_timeouts < VFSTONFS((v)->v_mount)->nm_deadthresh) \ + || ((f) == NQL_WRITE && ((n)->n_flag & NQNFSWRITE) == 0)) + +#define NQNFS_CKCACHABLE(v, f) \ + ((time.tv_sec <= VTONFS(v)->n_expiry || \ + VFSTONFS((v)->v_mount)->nm_timeouts >= VFSTONFS((v)->v_mount)->nm_deadthresh) \ + && (VTONFS(v)->n_flag & NQNFSNONCACHE) == 0 && \ + ((f) == NQL_READ || (VTONFS(v)->n_flag & NQNFSWRITE))) + +#define NQNFS_NEEDLEASE(v, p) \ + (time.tv_sec > VTONFS(v)->n_expiry ? \ + ((VTONFS(v)->n_flag & NQNFSEVICTED) ? 0 : nqnfs_piggy[p]) : \ + (((time.tv_sec + NQ_RENEWAL) > VTONFS(v)->n_expiry && \ + nqnfs_piggy[p]) ? \ + ((VTONFS(v)->n_flag & NQNFSWRITE) ? \ + NQL_WRITE : nqnfs_piggy[p]) : 0)) + +/* + * List head for timer queue. + */ +extern union nqsrvthead { + union nqsrvthead *th_head[2]; + struct nqlease *th_chain[2]; +} nqthead; +extern struct nqlease **nqfhead; +extern u_long nqfheadhash; + +/* + * Nqnfs return status numbers. + */ +#define NQNFS_EXPIRED 500 +#define NQNFS_TRYLATER 501 +#define NQNFS_AUTHERR 502 |
