/* * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved. * * This copyrighted material is made available to anyone wishing to use, * modify, copy, or redistribute it subject to the terms and conditions * of the GNU General Public License version 2. */ #include <linux/sched.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/completion.h> #include <linux/buffer_head.h> #include <linux/crc32.h> #include <linux/gfs2_ondisk.h> #include <linux/bio.h> #include "gfs2.h" #include "incore.h" #include "bmap.h" #include "dir.h" #include "glock.h" #include "glops.h" #include "inode.h" #include "log.h" #include "meta_io.h" #include "quota.h" #include "recovery.h" #include "rgrp.h" #include "super.h" #include "trans.h" #include "util.h" /** * gfs2_jindex_free - Clear all the journal index information * @sdp: The GFS2 superblock * */ void gfs2_jindex_free(struct gfs2_sbd *sdp) { struct list_head list, *head; struct gfs2_jdesc *jd; struct gfs2_journal_extent *jext; spin_lock(&sdp->sd_jindex_spin); list_add(&list, &sdp->sd_jindex_list); list_del_init(&sdp->sd_jindex_list); sdp->sd_journals = 0; spin_unlock(&sdp->sd_jindex_spin); while (!list_empty(&list)) { jd = list_entry(list.next, struct gfs2_jdesc, jd_list); head = &jd->extent_list; while (!list_empty(head)) { jext = list_entry(head->next, struct gfs2_journal_extent, extent_list); list_del(&jext->extent_list); kfree(jext); } list_del(&jd->jd_list); iput(jd->jd_inode); kfree(jd); } } static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid) { struct gfs2_jdesc *jd; int found = 0; list_for_each_entry(jd, head, jd_list) { if (jd->jd_jid == jid) { found = 1; break; } } if (!found) jd = NULL; return jd; } struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid) { struct gfs2_jdesc *jd; spin_lock(&sdp->sd_jindex_spin); jd = jdesc_find_i(&sdp->sd_jindex_list, jid); spin_unlock(&sdp->sd_jindex_spin); return jd; } int gfs2_jdesc_check(struct gfs2_jdesc *jd) { struct gfs2_inode *ip = GFS2_I(jd->jd_inode); struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); int ar; int error; if (ip->i_disksize < (8 << 20) || ip->i_disksize > (1 << 30) || (ip->i_disksize & (sdp->sd_sb.sb_bsize - 1))) { gfs2_consist_inode(ip); return -EIO; } jd->jd_blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift; error = gfs2_write_alloc_required(ip, 0, ip->i_disksize, &ar); if (!error && ar) { gfs2_consist_inode(ip); error = -EIO; } return error; } /** * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one * @sdp: the filesystem * * Returns: errno */ int gfs2_make_fs_rw(struct gfs2_sbd *sdp) { struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode); struct gfs2_glock *j_gl = ip->i_gl; struct gfs2_holder t_gh; struct gfs2_log_header_host head; int error; error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh); if (error) return error; j_gl->gl_ops->go_inval(j_gl, DIO_METADATA); error = gfs2_find_jhead(sdp->sd_jdesc, &head); if (error) goto fail; if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { gfs2_consist(sdp); error = -EIO; goto fail; } /* Initialize some head of the log stuff */ sdp->sd_log_sequence = head.lh_sequence + 1; gfs2_log_pointers_init(sdp, head.lh_blkno); error = gfs2_quota_init(sdp); if (error) goto fail; set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); gfs2_glock_dq_uninit(&t_gh); return 0; fail: t_gh.gh_flags |= GL_NOCACHE; gfs2_glock_dq_uninit(&t_gh); return error; } static void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf) { const struct gfs2_statfs_change *str = buf; sc->sc_total = be64_to_cpu(str->sc_total); sc->sc_free = be64_to_cpu(str->sc_free); sc->sc_dinodes = be64_to_cpu(str->sc_dinodes); } static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf) { struct gfs2_statfs_change *str = buf; str->sc_total = cpu_to_be64(sc->sc_total); str->sc_free = cpu_to_be64(sc->sc_free); str->sc_dinodes = cpu_to_be64(sc->sc_dinodes); } int gfs2_statfs_init(struct gfs2_sbd *sdp) { struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; struct buffer_head *m_bh, *l_bh; struct gfs2_holder gh; int error; error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, &gh); if (error) return error; error = gfs2_meta_inode_buffer(m_ip, &m_bh); if (error) goto out; if (sdp->sd_args.ar_spectator) { spin_lock(&sdp->sd_statfs_spin); gfs2_statfs_change_in(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); spin_unlock(&sdp->sd_statfs_spin); } else { error = gfs2_meta_inode_buffer(l_ip, &l_bh); if (error) goto out_m_bh; spin_lock(&sdp->sd_statfs_spin); gfs2_statfs_change_in(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); gfs2_statfs_change_in(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode)); spin_unlock(&sdp->sd_statfs_spin); brelse(l_bh); } out_m_bh: brelse(m_bh); out: gfs2_glock_dq_uninit(&gh); return 0; } void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free, s64 dinodes) { struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; struct buffer_head *l_bh; int error; error = gfs2_meta_inode_buffer(l_ip, &l_bh); if (error) return; gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1); spin_lock(&sdp->sd_statfs_spin); l_sc->sc_total += total; l_sc->sc_free += free; l_sc->sc_dinodes += dinodes; gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode)); spin_unlock(&sdp->sd_statfs_spin); brelse(l_bh); } int gfs2_statfs_sync(struct gfs2_sbd *sdp) { struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; struct gfs2_holder gh; struct buffer_head *m_bh, *l_bh; int error; error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, &gh); if (error) return error; error = gfs2_meta_inode_buffer(m_ip, &m_bh); if (error) goto out; spin_lock(&sdp->sd_statfs_spin); gfs2_statfs_change_in(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) { spin_unlock(&sdp->sd_statfs_spin); goto out_bh; } spin_unlock(&sdp->sd_statfs_spin); error = gfs2_meta_inode_buffer(l_ip, &l_bh); if (error) goto out_bh; error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); if (error) goto out_bh2; gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1); spin_lock(&sdp->sd_statfs_spin); m_sc->sc_total += l_sc->sc_total; m_sc->sc_free += l_sc->sc_free; m_sc->sc_dinodes += l_sc->sc_dinodes; memset(l_sc, 0, sizeof(struct gfs2_statfs_change)); memset(l_bh->b_data + sizeof(struct gfs2_dinode), 0, sizeof(struct gfs2_statfs_change)); spin_unlock(&sdp->sd_statfs_spin); gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); gfs2_trans_end(sdp); out_bh2: brelse(l_bh); out_bh: brelse(m_bh); out: gfs2_glock_dq_uninit(&gh); return error; } struct lfcc { struct list_head list; struct gfs2_holder gh; }; /** * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all * 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_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); } 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); }