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/* @(#)rnode.h 1.4 88/07/15 NFSSRC4.0 from 1.21 88/02/08 SMI */
/* Copyright (C) 1988, Sun Microsystems Inc. */
/*
* HISTORY
* 06-Feb-90 Morris Meyer (mmeyer) at NeXT
* Lock the vnode on a per-thread basis.
*
* 21-Dec-88 Peter King (king) at NeXT
* NFS 4.0 Changes: changed nfs_attr struct to vattr struct.
* improved locking.
*/
#ifndef _nfs_rnode_h
#define _nfs_rnode_h
/*
* Remote file information structure.
* The rnode is the "inode" for remote files. It contains all the
* information necessary to handle remote file on the client side.
*/
struct rnode {
struct rnode *r_freef; /* free list forward pointer */
struct rnode *r_freeb; /* free list back pointer */
struct rnode *r_hash; /* rnode hash chain */
struct vnode r_vnode; /* vnode for remote file */
fhandle_t r_fh; /* file handle */
u_short r_flags; /* flags, see below */
short r_error; /* async write error */
daddr_t r_lastr; /* last block read (read-ahead) */
#ifdef MACH
struct thread *r_thread; /* Thread index for locker of rnode */
#else
short r_owner; /* proc index for locker of rnode */
#endif
short r_count; /* number of rnode locks for r_owner */
struct ucred *r_cred; /* current credentials */
struct ucred *r_unlcred; /* unlinked credentials */
char *r_unlname; /* unlinked file name */
struct vnode *r_unldvp; /* parent dir of unlinked file */
struct vattr r_attr; /* cached vnode attributes */
struct timeval r_attrtime; /* time attributes become invalid */
};
#define r_size r_attr.va_size /* file size in bytes */
/*
* Flags
*/
#define RLOCKED 0x01 /* rnode is in use */
#define RWANT 0x02 /* someone wants a wakeup */
#define RATTRVALID 0x04 /* Attributes in the rnode are valid */
#define REOF 0x08 /* EOF encountered on read */
#define RDIRTY 0x10 /* dirty pages from write operation */
#if NeXT
#define RTIMEDOUT 0x20 /* timeout occured on lock */
#endif
/*
* Convert between vnode and rnode
*/
#define rtov(rp) (&(rp)->r_vnode)
#define vtor(vp) ((struct rnode *)((vp)->v_data))
#define vtofh(vp) (&(vtor(vp)->r_fh))
#define rtofh(rp) (&(rp)->r_fh)
/*
* Lock and unlock rnodes.
*/
#ifdef MACH
#define RLOCK(rp) { \
while (((rp)->r_flags & RLOCKED) && \
(rp)->r_thread != current_thread()) { \
(rp)->r_flags |= RWANT; \
(void) sleep((caddr_t)(rp), PINOD); \
} \
(rp)->r_thread = current_thread(); \
(rp)->r_count++; \
(rp)->r_flags |= RLOCKED; \
}
#else
#define RLOCK(rp) { \
while (((rp)->r_flags & RLOCKED) && \
(rp)->r_owner != u.u_procp - proc) { \
(rp)->r_flags |= RWANT; \
(void) sleep((caddr_t)(rp), PINOD); \
} \
(rp)->r_owner = u.u_procp - proc; \
(rp)->r_count++; \
(rp)->r_flags |= RLOCKED; \
}
#endif
#if NeXT
#define RUNLOCK(rp) { \
if (--(rp)->r_count < 0) \
panic("RUNLOCK"); \
if ((rp)->r_count == 0) { \
(rp)->r_flags &= ~(RLOCKED|RTIMEDOUT); \
if ((rp)->r_flags & RWANT) { \
(rp)->r_flags &= ~RWANT; \
wakeup((caddr_t)(rp)); \
} \
} \
}
#else
#define RUNLOCK(rp) { \
if (--(rp)->r_count < 0) \
panic("RUNLOCK"); \
if ((rp)->r_count == 0) { \
(rp)->r_flags &= ~RLOCKED; \
if ((rp)->r_flags & RWANT) { \
(rp)->r_flags &= ~RWANT; \
wakeup((caddr_t)(rp)); \
} \
} \
}
#endif
#endif
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