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https://github.com/FEX-Emu/linux.git
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42fe2b1f7f
updates and only sync back to the xfs inode when nessecary SGI-PV: 946679 SGI-Modid: xfs-linux-melb:xfs-kern:203362a Signed-off-by: Christoph Hellwig <hch@sgi.com> Signed-off-by: Nathan Scott <nathans@sgi.com>
217 lines
4.9 KiB
C
217 lines
4.9 KiB
C
/*
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* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms 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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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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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STATIC wait_queue_head_t vsync[NVSYNC];
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void
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vn_init(void)
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{
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int i;
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for (i = 0; i < NVSYNC; i++)
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init_waitqueue_head(&vsync[i]);
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}
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void
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vn_iowait(
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struct vnode *vp)
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{
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wait_queue_head_t *wq = vptosync(vp);
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wait_event(*wq, (atomic_read(&vp->v_iocount) == 0));
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}
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void
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vn_iowake(
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struct vnode *vp)
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{
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if (atomic_dec_and_test(&vp->v_iocount))
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wake_up(vptosync(vp));
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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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atomic_set(&vp->v_iocount, 0);
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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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#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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* 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 = 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_blksize = vap->va_blocksize;
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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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* 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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#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 *)(__psint_t)(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 */ NULL, NULL, NULL, NULL, NULL, NULL, NULL)
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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, const 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, const 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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