1621 lines
40 KiB
C
1621 lines
40 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/bio.h>
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#include <linux/sched/signal.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/statfs.h>
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#include <linux/seq_file.h>
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#include <linux/mount.h>
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#include <linux/kthread.h>
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#include <linux/delay.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/crc32.h>
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#include <linux/time.h>
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#include <linux/wait.h>
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#include <linux/writeback.h>
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#include <linux/backing-dev.h>
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#include <linux/kernel.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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#include "sys.h"
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#include "xattr.h"
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#include "lops.h"
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enum dinode_demise {
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SHOULD_DELETE_DINODE,
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SHOULD_NOT_DELETE_DINODE,
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SHOULD_DEFER_EVICTION,
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};
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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;
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struct gfs2_jdesc *jd;
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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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sdp->sd_jdesc = NULL;
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while (!list_empty(&list)) {
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jd = list_first_entry(&list, struct gfs2_jdesc, jd_list);
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gfs2_free_journal_extents(jd);
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list_del(&jd->jd_list);
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iput(jd->jd_inode);
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jd->jd_inode = NULL;
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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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list_for_each_entry(jd, head, jd_list) {
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if (jd->jd_jid == jid)
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return jd;
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}
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return NULL;
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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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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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u64 size = i_size_read(jd->jd_inode);
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if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, BIT(30)))
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return -EIO;
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jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
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if (gfs2_write_alloc_required(ip, 0, size)) {
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gfs2_consist_inode(ip);
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return -EIO;
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}
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return 0;
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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_log_header_host head;
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int error;
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j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
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if (gfs2_withdrawn(sdp))
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return -EIO;
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error = gfs2_find_jhead(sdp->sd_jdesc, &head, false);
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if (error) {
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gfs2_consist(sdp);
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return error;
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}
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if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
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gfs2_consist(sdp);
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return -EIO;
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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 && gfs2_withdrawn(sdp))
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error = -EIO;
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if (!error)
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set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
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return error;
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}
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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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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_statfs_change_host *l_sc = &sdp->sd_statfs_local;
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struct buffer_head *m_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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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, sdp->sd_sc_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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}
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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 gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
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s64 x, y;
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int need_sync = 0;
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gfs2_trans_add_meta(l_ip->i_gl, sdp->sd_sc_bh);
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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, sdp->sd_sc_bh->b_data +
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sizeof(struct gfs2_dinode));
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if (sdp->sd_args.ar_statfs_percent) {
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x = 100 * l_sc->sc_free;
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y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
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if (x >= y || x <= -y)
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need_sync = 1;
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}
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spin_unlock(&sdp->sd_statfs_spin);
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if (need_sync)
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gfs2_wake_up_statfs(sdp);
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}
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void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh)
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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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gfs2_trans_add_meta(l_ip->i_gl, sdp->sd_sc_bh);
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gfs2_trans_add_meta(m_ip->i_gl, m_bh);
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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(sdp->sd_sc_bh->b_data + sizeof(struct gfs2_dinode),
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0, sizeof(struct gfs2_statfs_change));
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gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
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spin_unlock(&sdp->sd_statfs_spin);
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}
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int gfs2_statfs_sync(struct super_block *sb, int type)
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{
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struct gfs2_sbd *sdp = sb->s_fs_info;
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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_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;
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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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goto out;
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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_unlock;
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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_trans_begin(sdp, 2 * RES_DINODE, 0);
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if (error)
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goto out_bh;
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update_statfs(sdp, m_bh);
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sdp->sd_statfs_force_sync = 0;
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gfs2_trans_end(sdp);
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out_bh:
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brelse(m_bh);
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out_unlock:
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gfs2_glock_dq_uninit(&gh);
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out:
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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
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* @sdp: the file system
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*
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* Returns: errno
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*/
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static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp)
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{
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struct gfs2_inode *ip;
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struct gfs2_jdesc *jd;
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struct lfcc *lfcc;
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LIST_HEAD(list);
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struct gfs2_log_header_host lh;
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int error, error2;
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/*
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* Grab all the journal glocks in SH mode. We are *probably* doing
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* that to prevent recovery.
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*/
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list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
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lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
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if (!lfcc) {
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error = -ENOMEM;
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goto out;
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}
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ip = GFS2_I(jd->jd_inode);
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error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
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if (error) {
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kfree(lfcc);
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goto out;
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}
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list_add(&lfcc->list, &list);
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}
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gfs2_freeze_unlock(&sdp->sd_freeze_gh);
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error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
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LM_FLAG_NOEXP | GL_NOPID,
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&sdp->sd_freeze_gh);
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if (error)
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goto relock_shared;
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list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
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error = gfs2_jdesc_check(jd);
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if (error)
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break;
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error = gfs2_find_jhead(jd, &lh, false);
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if (error)
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break;
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if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
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error = -EBUSY;
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break;
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}
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}
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if (!error)
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goto out; /* success */
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gfs2_freeze_unlock(&sdp->sd_freeze_gh);
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relock_shared:
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error2 = gfs2_freeze_lock_shared(sdp);
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gfs2_assert_withdraw(sdp, !error2);
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out:
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while (!list_empty(&list)) {
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lfcc = list_first_entry(&list, struct lfcc, list);
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list_del(&lfcc->list);
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gfs2_glock_dq_uninit(&lfcc->gh);
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kfree(lfcc);
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}
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return error;
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}
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void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
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{
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const struct inode *inode = &ip->i_inode;
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struct gfs2_dinode *str = buf;
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str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
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str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
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str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
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str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
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str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
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str->di_mode = cpu_to_be32(inode->i_mode);
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str->di_uid = cpu_to_be32(i_uid_read(inode));
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str->di_gid = cpu_to_be32(i_gid_read(inode));
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str->di_nlink = cpu_to_be32(inode->i_nlink);
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str->di_size = cpu_to_be64(i_size_read(inode));
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str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(inode));
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str->di_atime = cpu_to_be64(inode->i_atime.tv_sec);
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str->di_mtime = cpu_to_be64(inode->i_mtime.tv_sec);
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str->di_ctime = cpu_to_be64(inode->i_ctime.tv_sec);
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str->di_goal_meta = cpu_to_be64(ip->i_goal);
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str->di_goal_data = cpu_to_be64(ip->i_goal);
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str->di_generation = cpu_to_be64(ip->i_generation);
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str->di_flags = cpu_to_be32(ip->i_diskflags);
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str->di_height = cpu_to_be16(ip->i_height);
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str->di_payload_format = cpu_to_be32(S_ISDIR(inode->i_mode) &&
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!(ip->i_diskflags & GFS2_DIF_EXHASH) ?
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GFS2_FORMAT_DE : 0);
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str->di_depth = cpu_to_be16(ip->i_depth);
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str->di_entries = cpu_to_be32(ip->i_entries);
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str->di_eattr = cpu_to_be64(ip->i_eattr);
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str->di_atime_nsec = cpu_to_be32(inode->i_atime.tv_nsec);
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str->di_mtime_nsec = cpu_to_be32(inode->i_mtime.tv_nsec);
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str->di_ctime_nsec = cpu_to_be32(inode->i_ctime.tv_nsec);
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}
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/**
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* gfs2_write_inode - Make sure the inode is stable on the disk
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* @inode: The inode
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* @wbc: The writeback control structure
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*
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* Returns: errno
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*/
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static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
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{
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_sbd *sdp = GFS2_SB(inode);
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struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
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struct backing_dev_info *bdi = inode_to_bdi(metamapping->host);
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int ret = 0;
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bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip));
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if (flush_all)
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gfs2_log_flush(GFS2_SB(inode), ip->i_gl,
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GFS2_LOG_HEAD_FLUSH_NORMAL |
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|
GFS2_LFC_WRITE_INODE);
|
|
if (bdi->wb.dirty_exceeded)
|
|
gfs2_ail1_flush(sdp, wbc);
|
|
else
|
|
filemap_fdatawrite(metamapping);
|
|
if (flush_all)
|
|
ret = filemap_fdatawait(metamapping);
|
|
if (ret)
|
|
mark_inode_dirty_sync(inode);
|
|
else {
|
|
spin_lock(&inode->i_lock);
|
|
if (!(inode->i_flags & I_DIRTY))
|
|
gfs2_ordered_del_inode(ip);
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gfs2_dirty_inode - check for atime updates
|
|
* @inode: The inode in question
|
|
* @flags: The type of dirty
|
|
*
|
|
* Unfortunately it can be called under any combination of inode
|
|
* glock and freeze glock, so we have to check carefully.
|
|
*
|
|
* At the moment this deals only with atime - it should be possible
|
|
* to expand that role in future, once a review of the locking has
|
|
* been carried out.
|
|
*/
|
|
|
|
static void gfs2_dirty_inode(struct inode *inode, int flags)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct gfs2_sbd *sdp = GFS2_SB(inode);
|
|
struct buffer_head *bh;
|
|
struct gfs2_holder gh;
|
|
int need_unlock = 0;
|
|
int need_endtrans = 0;
|
|
int ret;
|
|
|
|
if (unlikely(!ip->i_gl)) {
|
|
/* This can only happen during incomplete inode creation. */
|
|
BUG_ON(!test_bit(GIF_ALLOC_FAILED, &ip->i_flags));
|
|
return;
|
|
}
|
|
|
|
if (unlikely(gfs2_withdrawn(sdp)))
|
|
return;
|
|
if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
|
|
ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
|
|
if (ret) {
|
|
fs_err(sdp, "dirty_inode: glock %d\n", ret);
|
|
gfs2_dump_glock(NULL, ip->i_gl, true);
|
|
return;
|
|
}
|
|
need_unlock = 1;
|
|
} else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
|
|
return;
|
|
|
|
if (current->journal_info == NULL) {
|
|
ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
|
|
if (ret) {
|
|
fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
|
|
goto out;
|
|
}
|
|
need_endtrans = 1;
|
|
}
|
|
|
|
ret = gfs2_meta_inode_buffer(ip, &bh);
|
|
if (ret == 0) {
|
|
gfs2_trans_add_meta(ip->i_gl, bh);
|
|
gfs2_dinode_out(ip, bh->b_data);
|
|
brelse(bh);
|
|
}
|
|
|
|
if (need_endtrans)
|
|
gfs2_trans_end(sdp);
|
|
out:
|
|
if (need_unlock)
|
|
gfs2_glock_dq_uninit(&gh);
|
|
}
|
|
|
|
/**
|
|
* gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
|
|
* @sdp: the filesystem
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
void gfs2_make_fs_ro(struct gfs2_sbd *sdp)
|
|
{
|
|
int log_write_allowed = test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
|
|
|
|
if (!test_bit(SDF_KILL, &sdp->sd_flags))
|
|
gfs2_flush_delete_work(sdp);
|
|
|
|
gfs2_destroy_threads(sdp);
|
|
|
|
if (log_write_allowed) {
|
|
gfs2_quota_sync(sdp->sd_vfs, 0);
|
|
gfs2_statfs_sync(sdp->sd_vfs, 0);
|
|
|
|
/* We do two log flushes here. The first one commits dirty inodes
|
|
* and rgrps to the journal, but queues up revokes to the ail list.
|
|
* The second flush writes out and removes the revokes.
|
|
*
|
|
* The first must be done before the FLUSH_SHUTDOWN code
|
|
* clears the LIVE flag, otherwise it will not be able to start
|
|
* a transaction to write its revokes, and the error will cause
|
|
* a withdraw of the file system. */
|
|
gfs2_log_flush(sdp, NULL, GFS2_LFC_MAKE_FS_RO);
|
|
gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN |
|
|
GFS2_LFC_MAKE_FS_RO);
|
|
wait_event_timeout(sdp->sd_log_waitq,
|
|
gfs2_log_is_empty(sdp),
|
|
HZ * 5);
|
|
gfs2_assert_warn(sdp, gfs2_log_is_empty(sdp));
|
|
}
|
|
gfs2_quota_cleanup(sdp);
|
|
}
|
|
|
|
/**
|
|
* gfs2_put_super - Unmount the filesystem
|
|
* @sb: The VFS superblock
|
|
*
|
|
*/
|
|
|
|
static void gfs2_put_super(struct super_block *sb)
|
|
{
|
|
struct gfs2_sbd *sdp = sb->s_fs_info;
|
|
struct gfs2_jdesc *jd;
|
|
|
|
/* No more recovery requests */
|
|
set_bit(SDF_NORECOVERY, &sdp->sd_flags);
|
|
smp_mb();
|
|
|
|
/* Wait on outstanding recovery */
|
|
restart:
|
|
spin_lock(&sdp->sd_jindex_spin);
|
|
list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
|
|
if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
|
|
continue;
|
|
spin_unlock(&sdp->sd_jindex_spin);
|
|
wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
|
|
TASK_UNINTERRUPTIBLE);
|
|
goto restart;
|
|
}
|
|
spin_unlock(&sdp->sd_jindex_spin);
|
|
|
|
if (!sb_rdonly(sb)) {
|
|
gfs2_make_fs_ro(sdp);
|
|
}
|
|
if (gfs2_withdrawn(sdp)) {
|
|
gfs2_destroy_threads(sdp);
|
|
gfs2_quota_cleanup(sdp);
|
|
}
|
|
WARN_ON(gfs2_withdrawing(sdp));
|
|
|
|
/* At this point, we're through modifying the disk */
|
|
|
|
/* Release stuff */
|
|
|
|
gfs2_freeze_unlock(&sdp->sd_freeze_gh);
|
|
|
|
iput(sdp->sd_jindex);
|
|
iput(sdp->sd_statfs_inode);
|
|
iput(sdp->sd_rindex);
|
|
iput(sdp->sd_quota_inode);
|
|
|
|
gfs2_glock_put(sdp->sd_rename_gl);
|
|
gfs2_glock_put(sdp->sd_freeze_gl);
|
|
|
|
if (!sdp->sd_args.ar_spectator) {
|
|
if (gfs2_holder_initialized(&sdp->sd_journal_gh))
|
|
gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
|
|
if (gfs2_holder_initialized(&sdp->sd_jinode_gh))
|
|
gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
|
|
brelse(sdp->sd_sc_bh);
|
|
gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
|
|
gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
|
|
free_local_statfs_inodes(sdp);
|
|
iput(sdp->sd_qc_inode);
|
|
}
|
|
|
|
gfs2_glock_dq_uninit(&sdp->sd_live_gh);
|
|
gfs2_clear_rgrpd(sdp);
|
|
gfs2_jindex_free(sdp);
|
|
/* Take apart glock structures and buffer lists */
|
|
gfs2_gl_hash_clear(sdp);
|
|
truncate_inode_pages_final(&sdp->sd_aspace);
|
|
gfs2_delete_debugfs_file(sdp);
|
|
/* Unmount the locking protocol */
|
|
gfs2_lm_unmount(sdp);
|
|
|
|
/* At this point, we're through participating in the lockspace */
|
|
gfs2_sys_fs_del(sdp);
|
|
free_sbd(sdp);
|
|
}
|
|
|
|
/**
|
|
* gfs2_sync_fs - sync the filesystem
|
|
* @sb: the superblock
|
|
* @wait: true to wait for completion
|
|
*
|
|
* Flushes the log to disk.
|
|
*/
|
|
|
|
static int gfs2_sync_fs(struct super_block *sb, int wait)
|
|
{
|
|
struct gfs2_sbd *sdp = sb->s_fs_info;
|
|
|
|
gfs2_quota_sync(sb, -1);
|
|
if (wait)
|
|
gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
|
|
GFS2_LFC_SYNC_FS);
|
|
return sdp->sd_log_error;
|
|
}
|
|
|
|
static int gfs2_freeze_locally(struct gfs2_sbd *sdp)
|
|
{
|
|
struct super_block *sb = sdp->sd_vfs;
|
|
int error;
|
|
|
|
error = freeze_super(sb);
|
|
if (error)
|
|
return error;
|
|
|
|
if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
|
|
gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_FREEZE |
|
|
GFS2_LFC_FREEZE_GO_SYNC);
|
|
if (gfs2_withdrawn(sdp)) {
|
|
thaw_super(sb);
|
|
return -EIO;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int gfs2_do_thaw(struct gfs2_sbd *sdp)
|
|
{
|
|
struct super_block *sb = sdp->sd_vfs;
|
|
int error;
|
|
|
|
error = gfs2_freeze_lock_shared(sdp);
|
|
if (error)
|
|
goto fail;
|
|
error = thaw_super(sb);
|
|
if (!error)
|
|
return 0;
|
|
|
|
fail:
|
|
fs_info(sdp, "GFS2: couldn't thaw filesystem: %d\n", error);
|
|
gfs2_assert_withdraw(sdp, 0);
|
|
return error;
|
|
}
|
|
|
|
void gfs2_freeze_func(struct work_struct *work)
|
|
{
|
|
struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
|
|
struct super_block *sb = sdp->sd_vfs;
|
|
int error;
|
|
|
|
mutex_lock(&sdp->sd_freeze_mutex);
|
|
error = -EBUSY;
|
|
if (test_bit(SDF_FROZEN, &sdp->sd_flags))
|
|
goto freeze_failed;
|
|
|
|
error = gfs2_freeze_locally(sdp);
|
|
if (error)
|
|
goto freeze_failed;
|
|
|
|
gfs2_freeze_unlock(&sdp->sd_freeze_gh);
|
|
set_bit(SDF_FROZEN, &sdp->sd_flags);
|
|
|
|
error = gfs2_do_thaw(sdp);
|
|
if (error)
|
|
goto out;
|
|
|
|
clear_bit(SDF_FROZEN, &sdp->sd_flags);
|
|
goto out;
|
|
|
|
freeze_failed:
|
|
fs_info(sdp, "GFS2: couldn't freeze filesystem: %d\n", error);
|
|
|
|
out:
|
|
mutex_unlock(&sdp->sd_freeze_mutex);
|
|
deactivate_super(sb);
|
|
}
|
|
|
|
/**
|
|
* gfs2_freeze_super - prevent further writes to the filesystem
|
|
* @sb: the VFS structure for the filesystem
|
|
*
|
|
*/
|
|
|
|
static int gfs2_freeze_super(struct super_block *sb)
|
|
{
|
|
struct gfs2_sbd *sdp = sb->s_fs_info;
|
|
int error;
|
|
|
|
if (!mutex_trylock(&sdp->sd_freeze_mutex))
|
|
return -EBUSY;
|
|
error = -EBUSY;
|
|
if (test_bit(SDF_FROZEN, &sdp->sd_flags))
|
|
goto out;
|
|
|
|
for (;;) {
|
|
error = gfs2_freeze_locally(sdp);
|
|
if (error) {
|
|
fs_info(sdp, "GFS2: couldn't freeze filesystem: %d\n",
|
|
error);
|
|
goto out;
|
|
}
|
|
|
|
error = gfs2_lock_fs_check_clean(sdp);
|
|
if (!error)
|
|
break; /* success */
|
|
|
|
error = gfs2_do_thaw(sdp);
|
|
if (error)
|
|
goto out;
|
|
|
|
if (error == -EBUSY)
|
|
fs_err(sdp, "waiting for recovery before freeze\n");
|
|
else if (error == -EIO) {
|
|
fs_err(sdp, "Fatal IO error: cannot freeze gfs2 due "
|
|
"to recovery error.\n");
|
|
goto out;
|
|
} else {
|
|
fs_err(sdp, "error freezing FS: %d\n", error);
|
|
}
|
|
fs_err(sdp, "retrying...\n");
|
|
msleep(1000);
|
|
}
|
|
|
|
out:
|
|
if (!error) {
|
|
set_bit(SDF_FREEZE_INITIATOR, &sdp->sd_flags);
|
|
set_bit(SDF_FROZEN, &sdp->sd_flags);
|
|
}
|
|
mutex_unlock(&sdp->sd_freeze_mutex);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_thaw_super - reallow writes to the filesystem
|
|
* @sb: the VFS structure for the filesystem
|
|
*
|
|
*/
|
|
|
|
static int gfs2_thaw_super(struct super_block *sb)
|
|
{
|
|
struct gfs2_sbd *sdp = sb->s_fs_info;
|
|
int error;
|
|
|
|
if (!mutex_trylock(&sdp->sd_freeze_mutex))
|
|
return -EBUSY;
|
|
error = -EINVAL;
|
|
if (!test_bit(SDF_FREEZE_INITIATOR, &sdp->sd_flags))
|
|
goto out;
|
|
|
|
gfs2_freeze_unlock(&sdp->sd_freeze_gh);
|
|
|
|
error = gfs2_do_thaw(sdp);
|
|
|
|
if (!error) {
|
|
clear_bit(SDF_FREEZE_INITIATOR, &sdp->sd_flags);
|
|
clear_bit(SDF_FROZEN, &sdp->sd_flags);
|
|
}
|
|
out:
|
|
mutex_unlock(&sdp->sd_freeze_mutex);
|
|
return error;
|
|
}
|
|
|
|
void gfs2_thaw_freeze_initiator(struct super_block *sb)
|
|
{
|
|
struct gfs2_sbd *sdp = sb->s_fs_info;
|
|
|
|
mutex_lock(&sdp->sd_freeze_mutex);
|
|
if (!test_bit(SDF_FREEZE_INITIATOR, &sdp->sd_flags))
|
|
goto out;
|
|
|
|
gfs2_freeze_unlock(&sdp->sd_freeze_gh);
|
|
|
|
out:
|
|
mutex_unlock(&sdp->sd_freeze_mutex);
|
|
}
|
|
|
|
/**
|
|
* statfs_slow_fill - fill in the sg for a given RG
|
|
* @rgd: the RG
|
|
* @sc: the sc structure
|
|
*
|
|
* Returns: 0 on success, -ESTALE if the LVB is invalid
|
|
*/
|
|
|
|
static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
|
|
struct gfs2_statfs_change_host *sc)
|
|
{
|
|
gfs2_rgrp_verify(rgd);
|
|
sc->sc_total += rgd->rd_data;
|
|
sc->sc_free += rgd->rd_free;
|
|
sc->sc_dinodes += rgd->rd_dinodes;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* gfs2_statfs_slow - Stat a filesystem using asynchronous locking
|
|
* @sdp: the filesystem
|
|
* @sc: the sc info that will be returned
|
|
*
|
|
* Any error (other than a signal) will cause this routine to fall back
|
|
* to the synchronous version.
|
|
*
|
|
* FIXME: This really shouldn't busy wait like this.
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
|
|
{
|
|
struct gfs2_rgrpd *rgd_next;
|
|
struct gfs2_holder *gha, *gh;
|
|
unsigned int slots = 64;
|
|
unsigned int x;
|
|
int done;
|
|
int error = 0, err;
|
|
|
|
memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
|
|
gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
|
|
if (!gha)
|
|
return -ENOMEM;
|
|
for (x = 0; x < slots; x++)
|
|
gfs2_holder_mark_uninitialized(gha + x);
|
|
|
|
rgd_next = gfs2_rgrpd_get_first(sdp);
|
|
|
|
for (;;) {
|
|
done = 1;
|
|
|
|
for (x = 0; x < slots; x++) {
|
|
gh = gha + x;
|
|
|
|
if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) {
|
|
err = gfs2_glock_wait(gh);
|
|
if (err) {
|
|
gfs2_holder_uninit(gh);
|
|
error = err;
|
|
} else {
|
|
if (!error) {
|
|
struct gfs2_rgrpd *rgd =
|
|
gfs2_glock2rgrp(gh->gh_gl);
|
|
|
|
error = statfs_slow_fill(rgd, sc);
|
|
}
|
|
gfs2_glock_dq_uninit(gh);
|
|
}
|
|
}
|
|
|
|
if (gfs2_holder_initialized(gh))
|
|
done = 0;
|
|
else if (rgd_next && !error) {
|
|
error = gfs2_glock_nq_init(rgd_next->rd_gl,
|
|
LM_ST_SHARED,
|
|
GL_ASYNC,
|
|
gh);
|
|
rgd_next = gfs2_rgrpd_get_next(rgd_next);
|
|
done = 0;
|
|
}
|
|
|
|
if (signal_pending(current))
|
|
error = -ERESTARTSYS;
|
|
}
|
|
|
|
if (done)
|
|
break;
|
|
|
|
yield();
|
|
}
|
|
|
|
kfree(gha);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_statfs_i - Do a statfs
|
|
* @sdp: the filesystem
|
|
* @sc: the sc structure
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
|
|
{
|
|
struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
|
|
struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
|
|
|
|
spin_lock(&sdp->sd_statfs_spin);
|
|
|
|
*sc = *m_sc;
|
|
sc->sc_total += l_sc->sc_total;
|
|
sc->sc_free += l_sc->sc_free;
|
|
sc->sc_dinodes += l_sc->sc_dinodes;
|
|
|
|
spin_unlock(&sdp->sd_statfs_spin);
|
|
|
|
if (sc->sc_free < 0)
|
|
sc->sc_free = 0;
|
|
if (sc->sc_free > sc->sc_total)
|
|
sc->sc_free = sc->sc_total;
|
|
if (sc->sc_dinodes < 0)
|
|
sc->sc_dinodes = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* gfs2_statfs - Gather and return stats about the filesystem
|
|
* @dentry: The name of the link
|
|
* @buf: The buffer
|
|
*
|
|
* Returns: 0 on success or error code
|
|
*/
|
|
|
|
static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct super_block *sb = dentry->d_sb;
|
|
struct gfs2_sbd *sdp = sb->s_fs_info;
|
|
struct gfs2_statfs_change_host sc;
|
|
int error;
|
|
|
|
error = gfs2_rindex_update(sdp);
|
|
if (error)
|
|
return error;
|
|
|
|
if (gfs2_tune_get(sdp, gt_statfs_slow))
|
|
error = gfs2_statfs_slow(sdp, &sc);
|
|
else
|
|
error = gfs2_statfs_i(sdp, &sc);
|
|
|
|
if (error)
|
|
return error;
|
|
|
|
buf->f_type = GFS2_MAGIC;
|
|
buf->f_bsize = sdp->sd_sb.sb_bsize;
|
|
buf->f_blocks = sc.sc_total;
|
|
buf->f_bfree = sc.sc_free;
|
|
buf->f_bavail = sc.sc_free;
|
|
buf->f_files = sc.sc_dinodes + sc.sc_free;
|
|
buf->f_ffree = sc.sc_free;
|
|
buf->f_namelen = GFS2_FNAMESIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* gfs2_drop_inode - Drop an inode (test for remote unlink)
|
|
* @inode: The inode to drop
|
|
*
|
|
* If we've received a callback on an iopen lock then it's because a
|
|
* remote node tried to deallocate the inode but failed due to this node
|
|
* still having the inode open. Here we mark the link count zero
|
|
* since we know that it must have reached zero if the GLF_DEMOTE flag
|
|
* is set on the iopen glock. If we didn't do a disk read since the
|
|
* remote node removed the final link then we might otherwise miss
|
|
* this event. This check ensures that this node will deallocate the
|
|
* inode's blocks, or alternatively pass the baton on to another
|
|
* node for later deallocation.
|
|
*/
|
|
|
|
static int gfs2_drop_inode(struct inode *inode)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct gfs2_sbd *sdp = GFS2_SB(inode);
|
|
|
|
if (inode->i_nlink &&
|
|
gfs2_holder_initialized(&ip->i_iopen_gh)) {
|
|
struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
|
|
if (test_bit(GLF_DEMOTE, &gl->gl_flags))
|
|
clear_nlink(inode);
|
|
}
|
|
|
|
/*
|
|
* When under memory pressure when an inode's link count has dropped to
|
|
* zero, defer deleting the inode to the delete workqueue. This avoids
|
|
* calling into DLM under memory pressure, which can deadlock.
|
|
*/
|
|
if (!inode->i_nlink &&
|
|
unlikely(current->flags & PF_MEMALLOC) &&
|
|
gfs2_holder_initialized(&ip->i_iopen_gh)) {
|
|
struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
|
|
|
|
gfs2_glock_hold(gl);
|
|
if (!gfs2_queue_try_to_evict(gl))
|
|
gfs2_glock_queue_put(gl);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* No longer cache inodes when trying to evict them all.
|
|
*/
|
|
if (test_bit(SDF_EVICTING, &sdp->sd_flags))
|
|
return 1;
|
|
|
|
return generic_drop_inode(inode);
|
|
}
|
|
|
|
static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
|
|
{
|
|
do {
|
|
if (d1 == d2)
|
|
return 1;
|
|
d1 = d1->d_parent;
|
|
} while (!IS_ROOT(d1));
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* gfs2_show_options - Show mount options for /proc/mounts
|
|
* @s: seq_file structure
|
|
* @root: root of this (sub)tree
|
|
*
|
|
* Returns: 0 on success or error code
|
|
*/
|
|
|
|
static int gfs2_show_options(struct seq_file *s, struct dentry *root)
|
|
{
|
|
struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
|
|
struct gfs2_args *args = &sdp->sd_args;
|
|
unsigned int logd_secs, statfs_slow, statfs_quantum, quota_quantum;
|
|
|
|
spin_lock(&sdp->sd_tune.gt_spin);
|
|
logd_secs = sdp->sd_tune.gt_logd_secs;
|
|
quota_quantum = sdp->sd_tune.gt_quota_quantum;
|
|
statfs_quantum = sdp->sd_tune.gt_statfs_quantum;
|
|
statfs_slow = sdp->sd_tune.gt_statfs_slow;
|
|
spin_unlock(&sdp->sd_tune.gt_spin);
|
|
|
|
if (is_ancestor(root, sdp->sd_master_dir))
|
|
seq_puts(s, ",meta");
|
|
if (args->ar_lockproto[0])
|
|
seq_show_option(s, "lockproto", args->ar_lockproto);
|
|
if (args->ar_locktable[0])
|
|
seq_show_option(s, "locktable", args->ar_locktable);
|
|
if (args->ar_hostdata[0])
|
|
seq_show_option(s, "hostdata", args->ar_hostdata);
|
|
if (args->ar_spectator)
|
|
seq_puts(s, ",spectator");
|
|
if (args->ar_localflocks)
|
|
seq_puts(s, ",localflocks");
|
|
if (args->ar_debug)
|
|
seq_puts(s, ",debug");
|
|
if (args->ar_posix_acl)
|
|
seq_puts(s, ",acl");
|
|
if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
|
|
char *state;
|
|
switch (args->ar_quota) {
|
|
case GFS2_QUOTA_OFF:
|
|
state = "off";
|
|
break;
|
|
case GFS2_QUOTA_ACCOUNT:
|
|
state = "account";
|
|
break;
|
|
case GFS2_QUOTA_ON:
|
|
state = "on";
|
|
break;
|
|
case GFS2_QUOTA_QUIET:
|
|
state = "quiet";
|
|
break;
|
|
default:
|
|
state = "unknown";
|
|
break;
|
|
}
|
|
seq_printf(s, ",quota=%s", state);
|
|
}
|
|
if (args->ar_suiddir)
|
|
seq_puts(s, ",suiddir");
|
|
if (args->ar_data != GFS2_DATA_DEFAULT) {
|
|
char *state;
|
|
switch (args->ar_data) {
|
|
case GFS2_DATA_WRITEBACK:
|
|
state = "writeback";
|
|
break;
|
|
case GFS2_DATA_ORDERED:
|
|
state = "ordered";
|
|
break;
|
|
default:
|
|
state = "unknown";
|
|
break;
|
|
}
|
|
seq_printf(s, ",data=%s", state);
|
|
}
|
|
if (args->ar_discard)
|
|
seq_puts(s, ",discard");
|
|
if (logd_secs != 30)
|
|
seq_printf(s, ",commit=%d", logd_secs);
|
|
if (statfs_quantum != 30)
|
|
seq_printf(s, ",statfs_quantum=%d", statfs_quantum);
|
|
else if (statfs_slow)
|
|
seq_puts(s, ",statfs_quantum=0");
|
|
if (quota_quantum != 60)
|
|
seq_printf(s, ",quota_quantum=%d", quota_quantum);
|
|
if (args->ar_statfs_percent)
|
|
seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
|
|
if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
|
|
const char *state;
|
|
|
|
switch (args->ar_errors) {
|
|
case GFS2_ERRORS_WITHDRAW:
|
|
state = "withdraw";
|
|
break;
|
|
case GFS2_ERRORS_PANIC:
|
|
state = "panic";
|
|
break;
|
|
default:
|
|
state = "unknown";
|
|
break;
|
|
}
|
|
seq_printf(s, ",errors=%s", state);
|
|
}
|
|
if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
|
|
seq_puts(s, ",nobarrier");
|
|
if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
|
|
seq_puts(s, ",demote_interface_used");
|
|
if (args->ar_rgrplvb)
|
|
seq_puts(s, ",rgrplvb");
|
|
if (args->ar_loccookie)
|
|
seq_puts(s, ",loccookie");
|
|
return 0;
|
|
}
|
|
|
|
static void gfs2_final_release_pages(struct gfs2_inode *ip)
|
|
{
|
|
struct inode *inode = &ip->i_inode;
|
|
struct gfs2_glock *gl = ip->i_gl;
|
|
|
|
if (unlikely(!gl)) {
|
|
/* This can only happen during incomplete inode creation. */
|
|
BUG_ON(!test_bit(GIF_ALLOC_FAILED, &ip->i_flags));
|
|
return;
|
|
}
|
|
|
|
truncate_inode_pages(gfs2_glock2aspace(gl), 0);
|
|
truncate_inode_pages(&inode->i_data, 0);
|
|
|
|
if (atomic_read(&gl->gl_revokes) == 0) {
|
|
clear_bit(GLF_LFLUSH, &gl->gl_flags);
|
|
clear_bit(GLF_DIRTY, &gl->gl_flags);
|
|
}
|
|
}
|
|
|
|
static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
|
|
{
|
|
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
|
|
struct gfs2_rgrpd *rgd;
|
|
struct gfs2_holder gh;
|
|
int error;
|
|
|
|
if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
|
|
gfs2_consist_inode(ip);
|
|
return -EIO;
|
|
}
|
|
|
|
gfs2_rindex_update(sdp);
|
|
|
|
error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
|
|
if (error)
|
|
return error;
|
|
|
|
rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
|
|
if (!rgd) {
|
|
gfs2_consist_inode(ip);
|
|
error = -EIO;
|
|
goto out_qs;
|
|
}
|
|
|
|
error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
|
|
LM_FLAG_NODE_SCOPE, &gh);
|
|
if (error)
|
|
goto out_qs;
|
|
|
|
error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
|
|
sdp->sd_jdesc->jd_blocks);
|
|
if (error)
|
|
goto out_rg_gunlock;
|
|
|
|
gfs2_free_di(rgd, ip);
|
|
|
|
gfs2_final_release_pages(ip);
|
|
|
|
gfs2_trans_end(sdp);
|
|
|
|
out_rg_gunlock:
|
|
gfs2_glock_dq_uninit(&gh);
|
|
out_qs:
|
|
gfs2_quota_unhold(ip);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_glock_put_eventually
|
|
* @gl: The glock to put
|
|
*
|
|
* When under memory pressure, trigger a deferred glock put to make sure we
|
|
* won't call into DLM and deadlock. Otherwise, put the glock directly.
|
|
*/
|
|
|
|
static void gfs2_glock_put_eventually(struct gfs2_glock *gl)
|
|
{
|
|
if (current->flags & PF_MEMALLOC)
|
|
gfs2_glock_queue_put(gl);
|
|
else
|
|
gfs2_glock_put(gl);
|
|
}
|
|
|
|
static bool gfs2_upgrade_iopen_glock(struct inode *inode)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct gfs2_sbd *sdp = GFS2_SB(inode);
|
|
struct gfs2_holder *gh = &ip->i_iopen_gh;
|
|
long timeout = 5 * HZ;
|
|
int error;
|
|
|
|
gh->gh_flags |= GL_NOCACHE;
|
|
gfs2_glock_dq_wait(gh);
|
|
|
|
/*
|
|
* If there are no other lock holders, we will immediately get
|
|
* exclusive access to the iopen glock here.
|
|
*
|
|
* Otherwise, the other nodes holding the lock will be notified about
|
|
* our locking request. If they do not have the inode open, they are
|
|
* expected to evict the cached inode and release the lock, allowing us
|
|
* to proceed.
|
|
*
|
|
* Otherwise, if they cannot evict the inode, they are expected to poke
|
|
* the inode glock (note: not the iopen glock). We will notice that
|
|
* and stop waiting for the iopen glock immediately. The other node(s)
|
|
* are then expected to take care of deleting the inode when they no
|
|
* longer use it.
|
|
*
|
|
* As a last resort, if another node keeps holding the iopen glock
|
|
* without showing any activity on the inode glock, we will eventually
|
|
* time out and fail the iopen glock upgrade.
|
|
*
|
|
* Note that we're passing the LM_FLAG_TRY_1CB flag to the first
|
|
* locking request as an optimization to notify lock holders as soon as
|
|
* possible. Without that flag, they'd be notified implicitly by the
|
|
* second locking request.
|
|
*/
|
|
|
|
gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, gh);
|
|
error = gfs2_glock_nq(gh);
|
|
if (error != GLR_TRYFAILED)
|
|
return !error;
|
|
|
|
gfs2_holder_reinit(LM_ST_EXCLUSIVE, GL_ASYNC | GL_NOCACHE, gh);
|
|
error = gfs2_glock_nq(gh);
|
|
if (error)
|
|
return false;
|
|
|
|
timeout = wait_event_interruptible_timeout(sdp->sd_async_glock_wait,
|
|
!test_bit(HIF_WAIT, &gh->gh_iflags) ||
|
|
test_bit(GLF_DEMOTE, &ip->i_gl->gl_flags),
|
|
timeout);
|
|
if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) {
|
|
gfs2_glock_dq(gh);
|
|
return false;
|
|
}
|
|
return gfs2_glock_holder_ready(gh) == 0;
|
|
}
|
|
|
|
/**
|
|
* evict_should_delete - determine whether the inode is eligible for deletion
|
|
* @inode: The inode to evict
|
|
* @gh: The glock holder structure
|
|
*
|
|
* This function determines whether the evicted inode is eligible to be deleted
|
|
* and locks the inode glock.
|
|
*
|
|
* Returns: the fate of the dinode
|
|
*/
|
|
static enum dinode_demise evict_should_delete(struct inode *inode,
|
|
struct gfs2_holder *gh)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct super_block *sb = inode->i_sb;
|
|
struct gfs2_sbd *sdp = sb->s_fs_info;
|
|
int ret;
|
|
|
|
if (unlikely(test_bit(GIF_ALLOC_FAILED, &ip->i_flags)))
|
|
goto should_delete;
|
|
|
|
if (test_bit(GIF_DEFERRED_DELETE, &ip->i_flags))
|
|
return SHOULD_DEFER_EVICTION;
|
|
|
|
/* Deletes should never happen under memory pressure anymore. */
|
|
if (WARN_ON_ONCE(current->flags & PF_MEMALLOC))
|
|
return SHOULD_DEFER_EVICTION;
|
|
|
|
/* Must not read inode block until block type has been verified */
|
|
ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, gh);
|
|
if (unlikely(ret)) {
|
|
glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
|
|
ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
|
|
gfs2_glock_dq_uninit(&ip->i_iopen_gh);
|
|
return SHOULD_DEFER_EVICTION;
|
|
}
|
|
|
|
if (gfs2_inode_already_deleted(ip->i_gl, ip->i_no_formal_ino))
|
|
return SHOULD_NOT_DELETE_DINODE;
|
|
ret = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
|
|
if (ret)
|
|
return SHOULD_NOT_DELETE_DINODE;
|
|
|
|
ret = gfs2_instantiate(gh);
|
|
if (ret)
|
|
return SHOULD_NOT_DELETE_DINODE;
|
|
|
|
/*
|
|
* The inode may have been recreated in the meantime.
|
|
*/
|
|
if (inode->i_nlink)
|
|
return SHOULD_NOT_DELETE_DINODE;
|
|
|
|
should_delete:
|
|
if (gfs2_holder_initialized(&ip->i_iopen_gh) &&
|
|
test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
|
|
if (!gfs2_upgrade_iopen_glock(inode)) {
|
|
gfs2_holder_uninit(&ip->i_iopen_gh);
|
|
return SHOULD_NOT_DELETE_DINODE;
|
|
}
|
|
}
|
|
return SHOULD_DELETE_DINODE;
|
|
}
|
|
|
|
/**
|
|
* evict_unlinked_inode - delete the pieces of an unlinked evicted inode
|
|
* @inode: The inode to evict
|
|
*/
|
|
static int evict_unlinked_inode(struct inode *inode)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
int ret;
|
|
|
|
if (S_ISDIR(inode->i_mode) &&
|
|
(ip->i_diskflags & GFS2_DIF_EXHASH)) {
|
|
ret = gfs2_dir_exhash_dealloc(ip);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
if (ip->i_eattr) {
|
|
ret = gfs2_ea_dealloc(ip);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
if (!gfs2_is_stuffed(ip)) {
|
|
ret = gfs2_file_dealloc(ip);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* As soon as we clear the bitmap for the dinode, gfs2_create_inode()
|
|
* can get called to recreate it, or even gfs2_inode_lookup() if the
|
|
* inode was recreated on another node in the meantime.
|
|
*
|
|
* However, inserting the new inode into the inode hash table will not
|
|
* succeed until the old inode is removed, and that only happens after
|
|
* ->evict_inode() returns. The new inode is attached to its inode and
|
|
* iopen glocks after inserting it into the inode hash table, so at
|
|
* that point we can be sure that both glocks are unused.
|
|
*/
|
|
|
|
ret = gfs2_dinode_dealloc(ip);
|
|
if (!ret && ip->i_gl)
|
|
gfs2_inode_remember_delete(ip->i_gl, ip->i_no_formal_ino);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* evict_linked_inode - evict an inode whose dinode has not been unlinked
|
|
* @inode: The inode to evict
|
|
*/
|
|
static int evict_linked_inode(struct inode *inode)
|
|
{
|
|
struct super_block *sb = inode->i_sb;
|
|
struct gfs2_sbd *sdp = sb->s_fs_info;
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct address_space *metamapping;
|
|
int ret;
|
|
|
|
gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
|
|
GFS2_LFC_EVICT_INODE);
|
|
metamapping = gfs2_glock2aspace(ip->i_gl);
|
|
if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
|
|
filemap_fdatawrite(metamapping);
|
|
filemap_fdatawait(metamapping);
|
|
}
|
|
write_inode_now(inode, 1);
|
|
gfs2_ail_flush(ip->i_gl, 0);
|
|
|
|
ret = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Needs to be done before glock release & also in a transaction */
|
|
truncate_inode_pages(&inode->i_data, 0);
|
|
truncate_inode_pages(metamapping, 0);
|
|
gfs2_trans_end(sdp);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* gfs2_evict_inode - Remove an inode from cache
|
|
* @inode: The inode to evict
|
|
*
|
|
* There are three cases to consider:
|
|
* 1. i_nlink == 0, we are final opener (and must deallocate)
|
|
* 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
|
|
* 3. i_nlink > 0
|
|
*
|
|
* If the fs is read only, then we have to treat all cases as per #3
|
|
* since we are unable to do any deallocation. The inode will be
|
|
* deallocated by the next read/write node to attempt an allocation
|
|
* in the same resource group
|
|
*
|
|
* We have to (at the moment) hold the inodes main lock to cover
|
|
* the gap between unlocking the shared lock on the iopen lock and
|
|
* taking the exclusive lock. I'd rather do a shared -> exclusive
|
|
* conversion on the iopen lock, but we can change that later. This
|
|
* is safe, just less efficient.
|
|
*/
|
|
|
|
static void gfs2_evict_inode(struct inode *inode)
|
|
{
|
|
struct super_block *sb = inode->i_sb;
|
|
struct gfs2_sbd *sdp = sb->s_fs_info;
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct gfs2_holder gh;
|
|
int ret;
|
|
|
|
if (inode->i_nlink || sb_rdonly(sb) || !ip->i_no_addr)
|
|
goto out;
|
|
|
|
/*
|
|
* In case of an incomplete mount, gfs2_evict_inode() may be called for
|
|
* system files without having an active journal to write to. In that
|
|
* case, skip the filesystem evict.
|
|
*/
|
|
if (!sdp->sd_jdesc)
|
|
goto out;
|
|
|
|
gfs2_holder_mark_uninitialized(&gh);
|
|
ret = evict_should_delete(inode, &gh);
|
|
if (ret == SHOULD_DEFER_EVICTION)
|
|
goto out;
|
|
if (ret == SHOULD_DELETE_DINODE)
|
|
ret = evict_unlinked_inode(inode);
|
|
else
|
|
ret = evict_linked_inode(inode);
|
|
|
|
if (gfs2_rs_active(&ip->i_res))
|
|
gfs2_rs_deltree(&ip->i_res);
|
|
|
|
if (gfs2_holder_initialized(&gh))
|
|
gfs2_glock_dq_uninit(&gh);
|
|
if (ret && ret != GLR_TRYFAILED && ret != -EROFS)
|
|
fs_warn(sdp, "gfs2_evict_inode: %d\n", ret);
|
|
out:
|
|
truncate_inode_pages_final(&inode->i_data);
|
|
if (ip->i_qadata)
|
|
gfs2_assert_warn(sdp, ip->i_qadata->qa_ref == 0);
|
|
gfs2_rs_deltree(&ip->i_res);
|
|
gfs2_ordered_del_inode(ip);
|
|
clear_inode(inode);
|
|
gfs2_dir_hash_inval(ip);
|
|
if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
|
|
struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
|
|
|
|
glock_clear_object(gl, ip);
|
|
gfs2_glock_hold(gl);
|
|
ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
|
|
gfs2_glock_dq_uninit(&ip->i_iopen_gh);
|
|
gfs2_glock_put_eventually(gl);
|
|
}
|
|
if (ip->i_gl) {
|
|
glock_clear_object(ip->i_gl, ip);
|
|
wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE);
|
|
gfs2_glock_add_to_lru(ip->i_gl);
|
|
gfs2_glock_put_eventually(ip->i_gl);
|
|
ip->i_gl = NULL;
|
|
}
|
|
}
|
|
|
|
static struct inode *gfs2_alloc_inode(struct super_block *sb)
|
|
{
|
|
struct gfs2_inode *ip;
|
|
|
|
ip = alloc_inode_sb(sb, gfs2_inode_cachep, GFP_KERNEL);
|
|
if (!ip)
|
|
return NULL;
|
|
ip->i_no_addr = 0;
|
|
ip->i_flags = 0;
|
|
ip->i_gl = NULL;
|
|
gfs2_holder_mark_uninitialized(&ip->i_iopen_gh);
|
|
memset(&ip->i_res, 0, sizeof(ip->i_res));
|
|
RB_CLEAR_NODE(&ip->i_res.rs_node);
|
|
ip->i_rahead = 0;
|
|
return &ip->i_inode;
|
|
}
|
|
|
|
static void gfs2_free_inode(struct inode *inode)
|
|
{
|
|
kmem_cache_free(gfs2_inode_cachep, GFS2_I(inode));
|
|
}
|
|
|
|
extern void free_local_statfs_inodes(struct gfs2_sbd *sdp)
|
|
{
|
|
struct local_statfs_inode *lsi, *safe;
|
|
|
|
/* Run through the statfs inodes list to iput and free memory */
|
|
list_for_each_entry_safe(lsi, safe, &sdp->sd_sc_inodes_list, si_list) {
|
|
if (lsi->si_jid == sdp->sd_jdesc->jd_jid)
|
|
sdp->sd_sc_inode = NULL; /* belongs to this node */
|
|
if (lsi->si_sc_inode)
|
|
iput(lsi->si_sc_inode);
|
|
list_del(&lsi->si_list);
|
|
kfree(lsi);
|
|
}
|
|
}
|
|
|
|
extern struct inode *find_local_statfs_inode(struct gfs2_sbd *sdp,
|
|
unsigned int index)
|
|
{
|
|
struct local_statfs_inode *lsi;
|
|
|
|
/* Return the local (per node) statfs inode in the
|
|
* sdp->sd_sc_inodes_list corresponding to the 'index'. */
|
|
list_for_each_entry(lsi, &sdp->sd_sc_inodes_list, si_list) {
|
|
if (lsi->si_jid == index)
|
|
return lsi->si_sc_inode;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
const struct super_operations gfs2_super_ops = {
|
|
.alloc_inode = gfs2_alloc_inode,
|
|
.free_inode = gfs2_free_inode,
|
|
.write_inode = gfs2_write_inode,
|
|
.dirty_inode = gfs2_dirty_inode,
|
|
.evict_inode = gfs2_evict_inode,
|
|
.put_super = gfs2_put_super,
|
|
.sync_fs = gfs2_sync_fs,
|
|
.freeze_super = gfs2_freeze_super,
|
|
.thaw_super = gfs2_thaw_super,
|
|
.statfs = gfs2_statfs,
|
|
.drop_inode = gfs2_drop_inode,
|
|
.show_options = gfs2_show_options,
|
|
};
|
|
|