xfs_fs_subr.c

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/*
 * Copyright (c) 2000-2002,2005-2006 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"
#include "xfs_trace.h"

/*
 * note: all filemap functions return negative error codes. These
 * need to be inverted before returning to the xfs core functions.
 */
void
xfs_tosspages(
    xfs_inode_t *ip,
    xfs_off_t   first,
    xfs_off_t   last,
    int     fiopt)
{
    /* can't toss partial tail pages, so mask them out */
    last &= ~(PAGE_SIZE - 1);
    truncate_inode_pages_range(VFS_I(ip)->i_mapping, first, last - 1);
}

int
xfs_flushinval_pages(
    xfs_inode_t *ip,
    xfs_off_t   first,
    xfs_off_t   last,
    int     fiopt)
{
    struct address_space *mapping = VFS_I(ip)->i_mapping;
    int     ret = 0;

    trace_xfs_pagecache_inval(ip, first, last);

    xfs_iflags_clear(ip, XFS_ITRUNCATED);
    ret = filemap_write_and_wait_range(mapping, first,
                last == -1 ? LLONG_MAX : last);
    if (!ret)
        truncate_inode_pages_range(mapping, first, last);
    return -ret;
}

int
xfs_flush_pages(
    xfs_inode_t *ip,
    xfs_off_t   first,
    xfs_off_t   last,
    uint64_t    flags,
    int     fiopt)
{
    struct address_space *mapping = VFS_I(ip)->i_mapping;
    int     ret = 0;
    int     ret2;

    xfs_iflags_clear(ip, XFS_ITRUNCATED);
    ret = -filemap_fdatawrite_range(mapping, first,
                last == -1 ? LLONG_MAX : last);
    if (flags & XBF_ASYNC)
        return ret;
    ret2 = xfs_wait_on_pages(ip, first, last);
    if (!ret)
        ret = ret2;
    return ret;
}

int
xfs_wait_on_pages(
    xfs_inode_t *ip,
    xfs_off_t   first,
    xfs_off_t   last)
{
    struct address_space *mapping = VFS_I(ip)->i_mapping;

    if (mapping_tagged(mapping, PAGECACHE_TAG_WRITEBACK)) {
        return -filemap_fdatawait_range(mapping, first,
                    last == -1 ? XFS_ISIZE(ip) - 1 : last);
    }
    return 0;
}