/* * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved. * * This program is free software; you can redistribute it and/or modify it * under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it would be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * * Further, this software is distributed without any warranty that it is * free of the rightful claim of any third person regarding infringement * or the like.  Any license provided herein, whether implied or * otherwise, applies only to this software file.  Patent licenses, if * any, provided herein do not apply to combinations of this program with * other software, or any other product whatsoever. * * You should have received a copy of the GNU General Public License along * with this program; if not, write the Free Software Foundation, Inc., 59 * Temple Place - Suite 330, Boston MA 02111-1307, USA. * * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, * Mountain View, CA  94043, or: * * http://www.sgi.com * * For further information regarding this notice, see: * * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ */#include "xfs.h"uint64_t vn_generation;		/* vnode generation number */spinlock_t vnumber_lock = SPIN_LOCK_UNLOCKED;/* * Dedicated vnode inactive/reclaim sync semaphores. * Prime number of hash buckets since address is used as the key. */#define NVSYNC                  37#define vptosync(v)             (&vsync[((unsigned long)v) % NVSYNC])sv_t vsync[NVSYNC];/* * Translate stat(2) file types to vnode types and vice versa. * Aware of numeric order of S_IFMT and vnode type values. */enum vtype iftovt_tab[] = {	VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON,	VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VNON};u_short vttoif_tab[] = {	0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, S_IFIFO, 0, S_IFSOCK};voidvn_init(void){	register sv_t *svp;	register int i;	for (svp = vsync, i = 0; i < NVSYNC; i++, svp++)		init_sv(svp, SV_DEFAULT, "vsy", i);}/* * Clean a vnode of filesystem-specific data and prepare it for reuse. */STATIC intvn_reclaim(	struct vnode	*vp){	int		error;	XFS_STATS_INC(vn_reclaim);	vn_trace_entry(vp, "vn_reclaim", (inst_t *)__return_address);	/*	 * Only make the VOP_RECLAIM call if there are behaviors	 * to call.	 */	if (vp->v_fbhv) {		VOP_RECLAIM(vp, error);		if (error)			return -error;	}	ASSERT(vp->v_fbhv == NULL);	VN_LOCK(vp);	vp->v_flag &= (VRECLM|VWAIT);	VN_UNLOCK(vp, 0);	vp->v_type = VNON;	vp->v_fbhv = NULL;#ifdef XFS_VNODE_TRACE	ktrace_free(vp->v_trace);	vp->v_trace = NULL;#endif	return 0;}STATIC voidvn_wakeup(	struct vnode	*vp){	VN_LOCK(vp);	if (vp->v_flag & VWAIT)		sv_broadcast(vptosync(vp));	vp->v_flag &= ~(VRECLM|VWAIT|VMODIFIED);	VN_UNLOCK(vp, 0);}intvn_wait(	struct vnode	*vp){	VN_LOCK(vp);	if (vp->v_flag & (VINACT | VRECLM)) {		vp->v_flag |= VWAIT;		sv_wait(vptosync(vp), PINOD, &vp->v_lock, 0);		return 1;	}	VN_UNLOCK(vp, 0);	return 0;}struct vnode *vn_initialize(	struct inode	*inode){	struct vnode	*vp = LINVFS_GET_VP(inode);	XFS_STATS_INC(vn_active);	XFS_STATS_INC(vn_alloc);	vp->v_flag = VMODIFIED;	spinlock_init(&vp->v_lock, "v_lock");	spin_lock(&vnumber_lock);	if (!++vn_generation)	/* v_number shouldn't be zero */		vn_generation++;	vp->v_number = vn_generation;	spin_unlock(&vnumber_lock);	ASSERT(VN_CACHED(vp) == 0);	/* Initialize the first behavior and the behavior chain head. */	vn_bhv_head_init(VN_BHV_HEAD(vp), "vnode");#ifdef	XFS_VNODE_TRACE	vp->v_trace = ktrace_alloc(VNODE_TRACE_SIZE, KM_SLEEP);	printk("Allocated VNODE_TRACE at 0x%p\n", vp->v_trace);#endif	/* XFS_VNODE_TRACE */	vn_trace_exit(vp, "vn_initialize", (inst_t *)__return_address);	return vp;}/* * Get a reference on a vnode. */vnode_t *vn_get(	struct vnode	*vp,	vmap_t		*vmap){	struct inode	*inode;	XFS_STATS_INC(vn_get);	inode = LINVFS_GET_IP(vp);	if (inode->i_state & I_FREEING)		return NULL;	inode = ilookup(vmap->v_vfsp->vfs_super, vmap->v_ino);	if (!inode)	/* Inode not present */		return NULL;	vn_trace_exit(vp, "vn_get", (inst_t *)__return_address);	return vp;}/* * Revalidate the Linux inode from the vnode. */intvn_revalidate(	struct vnode	*vp){	struct inode	*inode;	vattr_t		va;	int		error;	vn_trace_entry(vp, "vn_revalidate", (inst_t *)__return_address);	ASSERT(vp->v_fbhv != NULL);	va.va_mask = XFS_AT_STAT|XFS_AT_XFLAGS;	VOP_GETATTR(vp, &va, 0, NULL, error);	if (!error) {		inode = LINVFS_GET_IP(vp);		inode->i_mode	    = VTTOIF(va.va_type) | va.va_mode;		inode->i_nlink	    = va.va_nlink;		inode->i_uid	    = va.va_uid;		inode->i_gid	    = va.va_gid;		inode->i_blocks	    = va.va_nblocks;		inode->i_mtime	    = va.va_mtime;		inode->i_ctime	    = va.va_ctime;		inode->i_atime	    = va.va_atime;		if (va.va_xflags & XFS_XFLAG_IMMUTABLE)			inode->i_flags |= S_IMMUTABLE;		else			inode->i_flags &= ~S_IMMUTABLE;		if (va.va_xflags & XFS_XFLAG_APPEND)			inode->i_flags |= S_APPEND;		else			inode->i_flags &= ~S_APPEND;		if (va.va_xflags & XFS_XFLAG_SYNC)			inode->i_flags |= S_SYNC;		else			inode->i_flags &= ~S_SYNC;		if (va.va_xflags & XFS_XFLAG_NOATIME)			inode->i_flags |= S_NOATIME;		else			inode->i_flags &= ~S_NOATIME;		VUNMODIFY(vp);	}	return -error;}/* * purge a vnode from the cache * At this point the vnode is guaranteed to have no references (vn_count == 0) * The caller has to make sure that there are no ways someone could * get a handle (via vn_get) on the vnode (usually done via a mount/vfs lock). */voidvn_purge(	struct vnode	*vp,	vmap_t		*vmap){	vn_trace_entry(vp, "vn_purge", (inst_t *)__return_address);again:	/*	 * Check whether vp has already been reclaimed since our caller	 * sampled its version while holding a filesystem cache lock that	 * its VOP_RECLAIM function acquires.	 */	VN_LOCK(vp);	if (vp->v_number != vmap->v_number) {		VN_UNLOCK(vp, 0);		return;	}	/*	 * If vp is being reclaimed or inactivated, wait until it is inert,	 * then proceed.  Can't assume that vnode is actually reclaimed	 * just because the reclaimed flag is asserted -- a vn_alloc	 * reclaim can fail.	 */	if (vp->v_flag & (VINACT | VRECLM)) {		ASSERT(vn_count(vp) == 0);		vp->v_flag |= VWAIT;		sv_wait(vptosync(vp), PINOD, &vp->v_lock, 0);		goto again;	}	/*	 * Another process could have raced in and gotten this vnode...	 */	if (vn_count(vp) > 0) {		VN_UNLOCK(vp, 0);		return;	}	XFS_STATS_DEC(vn_active);	vp->v_flag |= VRECLM;	VN_UNLOCK(vp, 0);	/*	 * Call VOP_RECLAIM and clean vp. The FSYNC_INVAL flag tells	 * vp's filesystem to flush and invalidate all cached resources.	 * When vn_reclaim returns, vp should have no private data,	 * either in a system cache or attached to v_data.	 */	if (vn_reclaim(vp) != 0)		panic("vn_purge: cannot reclaim");	/*	 * Wakeup anyone waiting for vp to be reclaimed.	 */	vn_wakeup(vp);}/* * Add a reference to a referenced vnode. */struct vnode *vn_hold(	struct vnode	*vp){	struct inode	*inode;	XFS_STATS_INC(vn_hold);	VN_LOCK(vp);	inode = igrab(LINVFS_GET_IP(vp));	ASSERT(inode);	VN_UNLOCK(vp, 0);	return vp;}/* *  Call VOP_INACTIVE on last reference. */voidvn_rele(	struct vnode	*vp){	int		vcnt;	int		cache;	XFS_STATS_INC(vn_rele);	VN_LOCK(vp);	vn_trace_entry(vp, "vn_rele", (inst_t *)__return_address);	vcnt = vn_count(vp);	/*	 * Since we always get called from put_inode we know	 * that i_count won't be decremented after we	 * return.	 */	if (!vcnt) {		/*		 * As soon as we turn this on, noone can find us in vn_get		 * until we turn off VINACT or VRECLM		 */		vp->v_flag |= VINACT;		VN_UNLOCK(vp, 0);		/*		 * Do not make the VOP_INACTIVE call if there		 * are no behaviors attached to the vnode to call.		 */		if (vp->v_fbhv)			VOP_INACTIVE(vp, NULL, cache);		VN_LOCK(vp);		if (vp->v_flag & VWAIT)			sv_broadcast(vptosync(vp));		vp->v_flag &= ~(VINACT|VWAIT|VRECLM|VMODIFIED);	}	VN_UNLOCK(vp, 0);	vn_trace_exit(vp, "vn_rele", (inst_t *)__return_address);}/* * Finish the removal of a vnode. */voidvn_remove(	struct vnode	*vp){	vmap_t		vmap;	/* Make sure we don't do this to the same vnode twice */	if (!(vp->v_fbhv))		return;	XFS_STATS_INC(vn_remove);	vn_trace_exit(vp, "vn_remove", (inst_t *)__return_address);	/*	 * After the following purge the vnode	 * will no longer exist.	 */	VMAP(vp, vmap);	vn_purge(vp, &vmap);}#ifdef	XFS_VNODE_TRACE#define KTRACE_ENTER(vp, vk, s, line, ra)			\	ktrace_enter(	(vp)->v_trace,				\/*  0 */		(void *)(__psint_t)(vk),		\/*  1 */		(void *)(s),				\/*  2 */		(void *)(__psint_t) line,		\/*  3 */		(void *)(vn_count(vp)), \/*  4 */		(void *)(ra),				\/*  5 */		(void *)(__psunsigned_t)(vp)->v_flag,	\/*  6 */		(void *)(__psint_t)smp_processor_id(),	\/*  7 */		(void *)(__psint_t)(current->pid),	\/*  8 */		(void *)__return_address,		\/*  9 */		0, 0, 0, 0, 0, 0, 0)/* * Vnode tracing code. */voidvn_trace_entry(vnode_t *vp, char *func, inst_t *ra){	KTRACE_ENTER(vp, VNODE_KTRACE_ENTRY, func, 0, ra);}voidvn_trace_exit(vnode_t *vp, char *func, inst_t *ra){	KTRACE_ENTER(vp, VNODE_KTRACE_EXIT, func, 0, ra);}voidvn_trace_hold(vnode_t *vp, char *file, int line, inst_t *ra){	KTRACE_ENTER(vp, VNODE_KTRACE_HOLD, file, line, ra);}voidvn_trace_ref(vnode_t *vp, char *file, int line, inst_t *ra){	KTRACE_ENTER(vp, VNODE_KTRACE_REF, file, line, ra);}voidvn_trace_rele(vnode_t *vp, char *file, int line, inst_t *ra){	KTRACE_ENTER(vp, VNODE_KTRACE_RELE, file, line, ra);}#endif	/* XFS_VNODE_TRACE */