7d7d9e2242
adds a FS type specific flag indicating that the FS supports shared vnode lock lookups, adds some logic in vfs_lookup.c to test this flag and set lock flags appropriately. - amd on 6.x is a non-starter (without this change). Using amd under heavy load results in a deadlock (with cascading vnode locks all the way to the root) very quickly. - This change should also fix the more general problem of cascading vnode deadlocks when an NFS server goes down. Ideally, we wouldn't need these changes, as enabling shared vnode lock lookups globally would work. Unfortunately, UFS, for example isn't ready for shared vnode lock lookups, crashing pretty quickly. This change is the result of discussions with Stephan Uphoff (ups@). Reviewed by: ups@
207 lines
7.5 KiB
C
207 lines
7.5 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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/*
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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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u_int32_t n_mode; /* ACCESS mode cache */
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uid_t n_modeuid; /* credentials having mode */
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time_t n_modestamp; /* mode cache timestamp */
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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_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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struct lockf *n_lockf; /* Locking record of file */
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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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struct nfs4_fctx n_rfc;
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struct nfs4_fctx n_wfc;
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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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};
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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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* 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 struct proc *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 vop_vector nfs4_vnodeops;
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extern struct buf_ops buf_ops_nfs;
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extern struct buf_ops buf_ops_nfs4;
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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 nfs4_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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uint64_t *nfs4_getcookie(struct nfsnode *, off_t, int);
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void nfs_invaldir(struct vnode *);
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void nfs4_invaldir(struct vnode *);
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int nfs_upgrade_vnlock(struct vnode *vp, struct thread *td);
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void nfs_downgrade_vnlock(struct vnode *vp, struct thread *td, 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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