5218d82c81
For IO_APPEND VOP_WRITE()s, the code first does a Getattr RPC to acquire the file's size, before it can do the Write RPC. Although NFS does not have an append write operation, an NFSv4 compound can use a Verify operation to check that the client's notion of the file's size is correct, followed by the Write operation. This patch modifies the NFSv4 client to use an Appendwrite RPC, which does a Verify to check the file's size before doing the Write. This avoids the need for a Getattr RPC to preceed this RPC and reduces the RPC count by half for IO_APPEND writes, so long as the client knows the file's size. The nfsd structure was moved from the stack to be malloc()'d, since the kernel stack limit was being exceeded. While here, fix the types of a few variables, although there should not be any semantics change caused by these type changes.
129 lines
4.5 KiB
C
129 lines
4.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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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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* 3. 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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* $FreeBSD$
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*/
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#ifndef _NFSCLIENT_NFS_H_
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#define _NFSCLIENT_NFS_H_
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#if defined(_KERNEL)
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#ifndef NFS_TPRINTF_INITIAL_DELAY
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#define NFS_TPRINTF_INITIAL_DELAY 12
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#endif
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#ifndef NFS_TPRINTF_DELAY
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#define NFS_TPRINTF_DELAY 30
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#endif
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/*
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* Nfs version macros.
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*/
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#define NFS_ISV3(v) \
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(VFSTONFS((v)->v_mount)->nm_flag & NFSMNT_NFSV3)
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#define NFS_ISV4(v) \
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(VFSTONFS((v)->v_mount)->nm_flag & NFSMNT_NFSV4)
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#define NFS_ISV34(v) \
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(VFSTONFS((v)->v_mount)->nm_flag & (NFSMNT_NFSV3 | NFSMNT_NFSV4))
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#ifdef NFS_DEBUG
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extern int nfs_debug;
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#define NFS_DEBUG_ASYNCIO 1 /* asynchronous i/o */
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#define NFS_DEBUG_WG 2 /* server write gathering */
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#define NFS_DEBUG_RC 4 /* server request caching */
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#define NFS_DPF(cat, args) \
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do { \
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if (nfs_debug & NFS_DEBUG_##cat) printf args; \
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} while (0)
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#else
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#define NFS_DPF(cat, args)
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#endif
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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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* Function prototypes.
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*/
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int ncl_meta_setsize(struct vnode *, struct thread *, u_quad_t);
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void ncl_doio_directwrite(struct buf *);
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int ncl_bioread(struct vnode *, struct uio *, int, struct ucred *);
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int ncl_biowrite(struct vnode *, struct uio *, int, struct ucred *);
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int ncl_vinvalbuf(struct vnode *, int, struct thread *, int);
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int ncl_asyncio(struct nfsmount *, struct buf *, struct ucred *,
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struct thread *);
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int ncl_doio(struct vnode *, struct buf *, struct ucred *, struct thread *,
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int);
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void ncl_nhinit(void);
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void ncl_nhuninit(void);
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void ncl_nodelock(struct nfsnode *);
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void ncl_nodeunlock(struct nfsnode *);
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int ncl_getattrcache(struct vnode *, struct vattr *);
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int ncl_readrpc(struct vnode *, struct uio *, struct ucred *);
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int ncl_writerpc(struct vnode *, struct uio *, struct ucred *, int *, int *,
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int, int);
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int ncl_readlinkrpc(struct vnode *, struct uio *, struct ucred *);
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int ncl_readdirrpc(struct vnode *, struct uio *, struct ucred *,
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struct thread *);
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int ncl_readdirplusrpc(struct vnode *, struct uio *, struct ucred *,
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struct thread *);
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int ncl_writebp(struct buf *, int, struct thread *);
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int ncl_commit(struct vnode *, u_quad_t, int, struct ucred *, struct thread *);
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void ncl_clearcommit(struct mount *);
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int ncl_fsinfo(struct nfsmount *, struct vnode *, struct ucred *,
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struct thread *);
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int ncl_init(struct vfsconf *);
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int ncl_uninit(struct vfsconf *);
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void ncl_nfsiodnew(void);
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void ncl_nfsiodnew_tq(__unused void *, int);
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#endif /* _KERNEL */
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#endif /* _NFSCLIENT_NFS_H_ */
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