root/fs/xfs/linux-2.6/xfs_vnode.c

DEFINITIONS

1. vn_init
2. vn_iowait
3. vn_iowake
4. vn_ioerror
5. xfs_icount
6. _xfs_itrace_entry
7. _xfs_itrace_exit
8. xfs_itrace_hold
9. _xfs_itrace_ref
10. xfs_itrace_rele

/*
 * 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 wait queues.
 * 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);
}

#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)
{
        struct inode *vp = VFS_I(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 */