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b52896813c
gfs2_lock_fs_check_clean() should not be calling gfs2_jindex_hold() since it doesn't work like rindex hold, despite the comment. That allows gfs2_jindex_hold() to be moved into ops_fstype.c where it can be made static. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
606 lines
13 KiB
C
606 lines
13 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/crc32.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/bio.h>
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#include <linux/lm_interface.h>
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#include "gfs2.h"
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#include "incore.h"
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#include "bmap.h"
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#include "dir.h"
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#include "glock.h"
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#include "glops.h"
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#include "inode.h"
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#include "log.h"
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#include "meta_io.h"
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#include "quota.h"
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#include "recovery.h"
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#include "rgrp.h"
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#include "super.h"
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#include "trans.h"
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#include "util.h"
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/**
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* gfs2_jindex_free - Clear all the journal index information
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* @sdp: The GFS2 superblock
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*
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*/
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void gfs2_jindex_free(struct gfs2_sbd *sdp)
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{
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struct list_head list, *head;
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struct gfs2_jdesc *jd;
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struct gfs2_journal_extent *jext;
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spin_lock(&sdp->sd_jindex_spin);
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list_add(&list, &sdp->sd_jindex_list);
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list_del_init(&sdp->sd_jindex_list);
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sdp->sd_journals = 0;
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spin_unlock(&sdp->sd_jindex_spin);
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while (!list_empty(&list)) {
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jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
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head = &jd->extent_list;
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while (!list_empty(head)) {
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jext = list_entry(head->next,
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struct gfs2_journal_extent,
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extent_list);
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list_del(&jext->extent_list);
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kfree(jext);
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}
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list_del(&jd->jd_list);
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iput(jd->jd_inode);
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kfree(jd);
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}
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}
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static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
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{
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struct gfs2_jdesc *jd;
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int found = 0;
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list_for_each_entry(jd, head, jd_list) {
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if (jd->jd_jid == jid) {
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found = 1;
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break;
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}
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}
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if (!found)
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jd = NULL;
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return jd;
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}
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struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
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{
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struct gfs2_jdesc *jd;
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spin_lock(&sdp->sd_jindex_spin);
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jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
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spin_unlock(&sdp->sd_jindex_spin);
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return jd;
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}
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void gfs2_jdesc_make_dirty(struct gfs2_sbd *sdp, unsigned int jid)
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{
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struct gfs2_jdesc *jd;
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spin_lock(&sdp->sd_jindex_spin);
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jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
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if (jd)
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jd->jd_dirty = 1;
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spin_unlock(&sdp->sd_jindex_spin);
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}
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struct gfs2_jdesc *gfs2_jdesc_find_dirty(struct gfs2_sbd *sdp)
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{
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struct gfs2_jdesc *jd;
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int found = 0;
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spin_lock(&sdp->sd_jindex_spin);
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list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
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if (jd->jd_dirty) {
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jd->jd_dirty = 0;
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found = 1;
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break;
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}
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}
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spin_unlock(&sdp->sd_jindex_spin);
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if (!found)
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jd = NULL;
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return jd;
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}
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int gfs2_jdesc_check(struct gfs2_jdesc *jd)
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{
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struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
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struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
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int ar;
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int error;
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if (ip->i_disksize < (8 << 20) || ip->i_disksize > (1 << 30) ||
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(ip->i_disksize & (sdp->sd_sb.sb_bsize - 1))) {
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gfs2_consist_inode(ip);
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return -EIO;
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}
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jd->jd_blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
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error = gfs2_write_alloc_required(ip, 0, ip->i_disksize, &ar);
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if (!error && ar) {
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gfs2_consist_inode(ip);
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error = -EIO;
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}
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return error;
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}
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/**
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* gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
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* @sdp: the filesystem
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*
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* Returns: errno
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*/
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int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
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{
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struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
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struct gfs2_glock *j_gl = ip->i_gl;
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struct gfs2_holder t_gh;
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struct gfs2_log_header_host head;
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int error;
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error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
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if (error)
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return error;
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j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
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error = gfs2_find_jhead(sdp->sd_jdesc, &head);
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if (error)
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goto fail;
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if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
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gfs2_consist(sdp);
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error = -EIO;
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goto fail;
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}
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/* Initialize some head of the log stuff */
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sdp->sd_log_sequence = head.lh_sequence + 1;
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gfs2_log_pointers_init(sdp, head.lh_blkno);
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error = gfs2_quota_init(sdp);
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if (error)
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goto fail;
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set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
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gfs2_glock_dq_uninit(&t_gh);
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return 0;
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fail:
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t_gh.gh_flags |= GL_NOCACHE;
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gfs2_glock_dq_uninit(&t_gh);
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return error;
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}
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static void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
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{
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const struct gfs2_statfs_change *str = buf;
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sc->sc_total = be64_to_cpu(str->sc_total);
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sc->sc_free = be64_to_cpu(str->sc_free);
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sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
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}
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static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
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{
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struct gfs2_statfs_change *str = buf;
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str->sc_total = cpu_to_be64(sc->sc_total);
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str->sc_free = cpu_to_be64(sc->sc_free);
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str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
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}
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int gfs2_statfs_init(struct gfs2_sbd *sdp)
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{
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struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
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struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
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struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
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struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
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struct buffer_head *m_bh, *l_bh;
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struct gfs2_holder gh;
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int error;
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error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
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&gh);
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if (error)
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return error;
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error = gfs2_meta_inode_buffer(m_ip, &m_bh);
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if (error)
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goto out;
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if (sdp->sd_args.ar_spectator) {
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spin_lock(&sdp->sd_statfs_spin);
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gfs2_statfs_change_in(m_sc, m_bh->b_data +
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sizeof(struct gfs2_dinode));
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spin_unlock(&sdp->sd_statfs_spin);
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} else {
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error = gfs2_meta_inode_buffer(l_ip, &l_bh);
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if (error)
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goto out_m_bh;
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spin_lock(&sdp->sd_statfs_spin);
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gfs2_statfs_change_in(m_sc, m_bh->b_data +
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sizeof(struct gfs2_dinode));
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gfs2_statfs_change_in(l_sc, l_bh->b_data +
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sizeof(struct gfs2_dinode));
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spin_unlock(&sdp->sd_statfs_spin);
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brelse(l_bh);
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}
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out_m_bh:
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brelse(m_bh);
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out:
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gfs2_glock_dq_uninit(&gh);
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return 0;
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}
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void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
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s64 dinodes)
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{
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struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
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struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
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struct buffer_head *l_bh;
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int error;
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error = gfs2_meta_inode_buffer(l_ip, &l_bh);
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if (error)
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return;
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gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
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spin_lock(&sdp->sd_statfs_spin);
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l_sc->sc_total += total;
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l_sc->sc_free += free;
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l_sc->sc_dinodes += dinodes;
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gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
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spin_unlock(&sdp->sd_statfs_spin);
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brelse(l_bh);
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}
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int gfs2_statfs_sync(struct gfs2_sbd *sdp)
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{
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struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
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struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
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struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
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struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
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struct gfs2_holder gh;
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struct buffer_head *m_bh, *l_bh;
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int error;
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error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
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&gh);
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if (error)
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return error;
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error = gfs2_meta_inode_buffer(m_ip, &m_bh);
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if (error)
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goto out;
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spin_lock(&sdp->sd_statfs_spin);
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gfs2_statfs_change_in(m_sc, m_bh->b_data +
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sizeof(struct gfs2_dinode));
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if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
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spin_unlock(&sdp->sd_statfs_spin);
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goto out_bh;
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}
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spin_unlock(&sdp->sd_statfs_spin);
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error = gfs2_meta_inode_buffer(l_ip, &l_bh);
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if (error)
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goto out_bh;
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error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
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if (error)
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goto out_bh2;
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gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
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spin_lock(&sdp->sd_statfs_spin);
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m_sc->sc_total += l_sc->sc_total;
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m_sc->sc_free += l_sc->sc_free;
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m_sc->sc_dinodes += l_sc->sc_dinodes;
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memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
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memset(l_bh->b_data + sizeof(struct gfs2_dinode),
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0, sizeof(struct gfs2_statfs_change));
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spin_unlock(&sdp->sd_statfs_spin);
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gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
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gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
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gfs2_trans_end(sdp);
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out_bh2:
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brelse(l_bh);
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out_bh:
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brelse(m_bh);
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out:
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gfs2_glock_dq_uninit(&gh);
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return error;
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}
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/**
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* gfs2_statfs_i - Do a statfs
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* @sdp: the filesystem
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* @sg: the sg structure
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*
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* Returns: errno
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*/
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int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
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{
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struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
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struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
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spin_lock(&sdp->sd_statfs_spin);
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*sc = *m_sc;
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sc->sc_total += l_sc->sc_total;
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sc->sc_free += l_sc->sc_free;
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sc->sc_dinodes += l_sc->sc_dinodes;
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spin_unlock(&sdp->sd_statfs_spin);
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if (sc->sc_free < 0)
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sc->sc_free = 0;
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if (sc->sc_free > sc->sc_total)
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sc->sc_free = sc->sc_total;
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if (sc->sc_dinodes < 0)
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sc->sc_dinodes = 0;
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return 0;
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}
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/**
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* statfs_fill - fill in the sg for a given RG
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* @rgd: the RG
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* @sc: the sc structure
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*
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* Returns: 0 on success, -ESTALE if the LVB is invalid
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*/
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static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
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struct gfs2_statfs_change_host *sc)
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{
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gfs2_rgrp_verify(rgd);
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sc->sc_total += rgd->rd_data;
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sc->sc_free += rgd->rd_free;
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sc->sc_dinodes += rgd->rd_dinodes;
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return 0;
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}
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/**
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* gfs2_statfs_slow - Stat a filesystem using asynchronous locking
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* @sdp: the filesystem
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* @sc: the sc info that will be returned
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*
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* Any error (other than a signal) will cause this routine to fall back
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* to the synchronous version.
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*
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* FIXME: This really shouldn't busy wait like this.
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*
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* Returns: errno
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*/
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int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
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{
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struct gfs2_holder ri_gh;
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struct gfs2_rgrpd *rgd_next;
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struct gfs2_holder *gha, *gh;
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unsigned int slots = 64;
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unsigned int x;
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int done;
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int error = 0, err;
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memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
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gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
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if (!gha)
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return -ENOMEM;
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error = gfs2_rindex_hold(sdp, &ri_gh);
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if (error)
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goto out;
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rgd_next = gfs2_rgrpd_get_first(sdp);
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for (;;) {
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done = 1;
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for (x = 0; x < slots; x++) {
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gh = gha + x;
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if (gh->gh_gl && gfs2_glock_poll(gh)) {
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err = gfs2_glock_wait(gh);
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if (err) {
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gfs2_holder_uninit(gh);
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error = err;
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} else {
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if (!error)
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error = statfs_slow_fill(
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gh->gh_gl->gl_object, sc);
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gfs2_glock_dq_uninit(gh);
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}
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}
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if (gh->gh_gl)
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done = 0;
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else if (rgd_next && !error) {
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error = gfs2_glock_nq_init(rgd_next->rd_gl,
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LM_ST_SHARED,
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GL_ASYNC,
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gh);
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rgd_next = gfs2_rgrpd_get_next(rgd_next);
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done = 0;
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}
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if (signal_pending(current))
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error = -ERESTARTSYS;
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}
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if (done)
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break;
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yield();
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}
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gfs2_glock_dq_uninit(&ri_gh);
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out:
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kfree(gha);
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return error;
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}
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struct lfcc {
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struct list_head list;
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struct gfs2_holder gh;
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};
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/**
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* gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
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* journals are clean
|
|
* @sdp: the file system
|
|
* @state: the state to put the transaction lock into
|
|
* @t_gh: the hold on the transaction lock
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
|
|
struct gfs2_holder *t_gh)
|
|
{
|
|
struct gfs2_inode *ip;
|
|
struct gfs2_holder ji_gh;
|
|
struct gfs2_jdesc *jd;
|
|
struct lfcc *lfcc;
|
|
LIST_HEAD(list);
|
|
struct gfs2_log_header_host lh;
|
|
int error;
|
|
|
|
list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
|
|
lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
|
|
if (!lfcc) {
|
|
error = -ENOMEM;
|
|
goto out;
|
|
}
|
|
ip = GFS2_I(jd->jd_inode);
|
|
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
|
|
if (error) {
|
|
kfree(lfcc);
|
|
goto out;
|
|
}
|
|
list_add(&lfcc->list, &list);
|
|
}
|
|
|
|
error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
|
|
GL_NOCACHE, t_gh);
|
|
|
|
list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
|
|
error = gfs2_jdesc_check(jd);
|
|
if (error)
|
|
break;
|
|
error = gfs2_find_jhead(jd, &lh);
|
|
if (error)
|
|
break;
|
|
if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
|
|
error = -EBUSY;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (error)
|
|
gfs2_glock_dq_uninit(t_gh);
|
|
|
|
out:
|
|
while (!list_empty(&list)) {
|
|
lfcc = list_entry(list.next, struct lfcc, list);
|
|
list_del(&lfcc->list);
|
|
gfs2_glock_dq_uninit(&lfcc->gh);
|
|
kfree(lfcc);
|
|
}
|
|
gfs2_glock_dq_uninit(&ji_gh);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_freeze_fs - freezes the file system
|
|
* @sdp: the file system
|
|
*
|
|
* This function flushes data and meta data for all machines by
|
|
* aquiring the transaction log exclusively. All journals are
|
|
* ensured to be in a clean state as well.
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
int gfs2_freeze_fs(struct gfs2_sbd *sdp)
|
|
{
|
|
int error = 0;
|
|
|
|
mutex_lock(&sdp->sd_freeze_lock);
|
|
|
|
if (!sdp->sd_freeze_count++) {
|
|
error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
|
|
if (error)
|
|
sdp->sd_freeze_count--;
|
|
}
|
|
|
|
mutex_unlock(&sdp->sd_freeze_lock);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_unfreeze_fs - unfreezes the file system
|
|
* @sdp: the file system
|
|
*
|
|
* This function allows the file system to proceed by unlocking
|
|
* the exclusively held transaction lock. Other GFS2 nodes are
|
|
* now free to acquire the lock shared and go on with their lives.
|
|
*
|
|
*/
|
|
|
|
void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
|
|
{
|
|
mutex_lock(&sdp->sd_freeze_lock);
|
|
|
|
if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
|
|
gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
|
|
|
|
mutex_unlock(&sdp->sd_freeze_lock);
|
|
}
|
|
|