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