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/*
* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms 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. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xfs.h"
#include "xfs_vnodeops.h"
#include "xfs_bmap_btree.h"
#include "xfs_inode.h"
/*
* And this gunk is needed for xfs_mount.h"
*/
#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_dmapi.h"
#include "xfs_inum.h"
#include "xfs_ag.h"
#include "xfs_mount.h"
/*
* 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])
static wait_queue_head_t vsync[NVSYNC];
void __init
vn_init(void)
{
int i;
for (i = 0; i < NVSYNC; i++)
init_waitqueue_head(&vsync[i]);
}
void
vn_iowait(
xfs_inode_t *ip)
{
wait_queue_head_t *wq = vptosync(ip);
wait_event(*wq, (atomic_read(&ip->i_iocount) == 0));
}
void
vn_iowake(
xfs_inode_t *ip)
{
if (atomic_dec_and_test(&ip->i_iocount))
wake_up(vptosync(ip));
}
/*
* Volume managers supporting multiple paths can send back ENODEV when the
* final path disappears. In this case continuing to fill the page cache
* with dirty data which cannot be written out is evil, so prevent that.
*/
void
vn_ioerror(
xfs_inode_t *ip,
int error,
char *f,
int l)
{
if (unlikely(error == -ENODEV))
xfs_do_force_shutdown(ip->i_mount, SHUTDOWN_DEVICE_REQ, f, l);
}
/*
* Add a reference to a referenced vnode.
*/
bhv_vnode_t *
vn_hold(
bhv_vnode_t *vp)
{
struct inode *inode;
XFS_STATS_INC(vn_hold);
inode = igrab(vn_to_inode(vp));
ASSERT(inode);
return vp;
}
#ifdef XFS_INODE_TRACE
/*
* Reference count of Linux inode if present, -1 if the xfs_inode
* has no associated Linux inode.
*/
static inline int xfs_icount(struct xfs_inode *ip)
{
bhv_vnode_t *vp = XFS_ITOV_NULL(ip);
if (vp)
return vn_count(vp);
return -1;
}
#define KTRACE_ENTER(ip, vk, s, line, ra) \
ktrace_enter( (ip)->i_trace, \
/* 0 */ (void *)(__psint_t)(vk), \
/* 1 */ (void *)(s), \
/* 2 */ (void *)(__psint_t) line, \
/* 3 */ (void *)(__psint_t)xfs_icount(ip), \
/* 4 */ (void *)(ra), \
/* 5 */ NULL, \
/* 6 */ (void *)(__psint_t)current_cpu(), \
/* 7 */ (void *)(__psint_t)current_pid(), \
/* 8 */ (void *)__return_address, \
/* 9 */ NULL, NULL, NULL, NULL, NULL, NULL, NULL)
/*
* Vnode tracing code.
*/
void
_xfs_itrace_entry(xfs_inode_t *ip, const char *func, inst_t *ra)
{
KTRACE_ENTER(ip, INODE_KTRACE_ENTRY, func, 0, ra);
}
void
_xfs_itrace_exit(xfs_inode_t *ip, const char *func, inst_t *ra)
{
KTRACE_ENTER(ip, INODE_KTRACE_EXIT, func, 0, ra);
}
void
xfs_itrace_hold(xfs_inode_t *ip, char *file, int line, inst_t *ra)
{
KTRACE_ENTER(ip, INODE_KTRACE_HOLD, file, line, ra);
}
void
_xfs_itrace_ref(xfs_inode_t *ip, char *file, int line, inst_t *ra)
{
KTRACE_ENTER(ip, INODE_KTRACE_REF, file, line, ra);
}
void
xfs_itrace_rele(xfs_inode_t *ip, char *file, int line, inst_t *ra)
{
KTRACE_ENTER(ip, INODE_KTRACE_RELE, file, line, ra);
}
#endif /* XFS_INODE_TRACE */
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