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1488 lines
37 KiB
1488 lines
37 KiB
// 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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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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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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|
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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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/** |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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 || gfs2_withdrawn(sdp)) |
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return error; |
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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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|
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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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|
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error = gfs2_quota_init(sdp); |
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if (!error && !gfs2_withdrawn(sdp)) |
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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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|
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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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|
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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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/** |
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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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|
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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; |
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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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|
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error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE, |
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LM_FLAG_NOEXP, &sdp->sd_freeze_gh); |
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if (error) |
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goto out; |
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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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|
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if (error) |
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gfs2_freeze_unlock(&sdp->sd_freeze_gh); |
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|
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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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|
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void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf) |
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{ |
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struct gfs2_dinode *str = buf; |
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|
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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(ip->i_inode.i_mode); |
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str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode)); |
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str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode)); |
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str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink); |
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str->di_size = cpu_to_be64(i_size_read(&ip->i_inode)); |
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str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode)); |
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str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); |
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str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec); |
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str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec); |
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|
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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(ip->i_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(ip->i_inode.i_atime.tv_nsec); |
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str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec); |
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str->di_ctime_nsec = cpu_to_be32(ip->i_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 |
|
* @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); |
|
struct gfs2_sbd *sdp = GFS2_SB(inode); |
|
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); |
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if (bdi->wb.dirty_exceeded) |
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gfs2_ail1_flush(sdp, wbc); |
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else |
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filemap_fdatawrite(metamapping); |
|
if (flush_all) |
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ret = filemap_fdatawait(metamapping); |
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if (ret) |
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mark_inode_dirty_sync(inode); |
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else { |
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spin_lock(&inode->i_lock); |
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if (!(inode->i_flags & I_DIRTY)) |
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gfs2_ordered_del_inode(ip); |
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spin_unlock(&inode->i_lock); |
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} |
|
return ret; |
|
} |
|
|
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/** |
|
* gfs2_dirty_inode - check for atime updates |
|
* @inode: The inode in question |
|
* @flags: The type of dirty |
|
* |
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* Unfortunately it can be called under any combination of inode |
|
* glock and transaction lock, so we have to check carefully. |
|
* |
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* At the moment this deals only with atime - it should be possible |
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* to expand that role in future, once a review of the locking has |
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* been carried out. |
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*/ |
|
|
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static void gfs2_dirty_inode(struct inode *inode, int flags) |
|
{ |
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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 buffer_head *bh; |
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struct gfs2_holder gh; |
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int need_unlock = 0; |
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int need_endtrans = 0; |
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int ret; |
|
|
|
if (unlikely(gfs2_withdrawn(sdp))) |
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return; |
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if (!gfs2_glock_is_locked_by_me(ip->i_gl)) { |
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ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
|
if (ret) { |
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fs_err(sdp, "dirty_inode: glock %d\n", ret); |
|
gfs2_dump_glock(NULL, ip->i_gl, true); |
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return; |
|
} |
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need_unlock = 1; |
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} 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) { |
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fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret); |
|
goto out; |
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} |
|
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); |
|
|
|
gfs2_flush_delete_work(sdp); |
|
if (!log_write_allowed && current == sdp->sd_quotad_process) |
|
fs_warn(sdp, "The quotad daemon is withdrawing.\n"); |
|
else if (sdp->sd_quotad_process) |
|
kthread_stop(sdp->sd_quotad_process); |
|
sdp->sd_quotad_process = NULL; |
|
|
|
if (!log_write_allowed && current == sdp->sd_logd_process) |
|
fs_warn(sdp, "The logd daemon is withdrawing.\n"); |
|
else if (sdp->sd_logd_process) |
|
kthread_stop(sdp->sd_logd_process); |
|
sdp->sd_logd_process = NULL; |
|
|
|
if (log_write_allowed) { |
|
gfs2_quota_sync(sdp->sd_vfs, 0); |
|
gfs2_statfs_sync(sdp->sd_vfs, 0); |
|
|
|
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)); |
|
} else { |
|
wait_event_timeout(sdp->sd_log_waitq, |
|
gfs2_log_is_empty(sdp), |
|
HZ * 5); |
|
} |
|
gfs2_quota_cleanup(sdp); |
|
|
|
if (!log_write_allowed) |
|
sdp->sd_vfs->s_flags |= SB_RDONLY; |
|
} |
|
|
|
/** |
|
* 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); |
|
} |
|
WARN_ON(gfs2_withdrawing(sdp)); |
|
|
|
/* At this point, we're through modifying the disk */ |
|
|
|
/* Release stuff */ |
|
|
|
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; |
|
} |
|
|
|
void gfs2_freeze_func(struct work_struct *work) |
|
{ |
|
int error; |
|
struct gfs2_holder freeze_gh; |
|
struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work); |
|
struct super_block *sb = sdp->sd_vfs; |
|
|
|
atomic_inc(&sb->s_active); |
|
error = gfs2_freeze_lock(sdp, &freeze_gh, 0); |
|
if (error) { |
|
gfs2_assert_withdraw(sdp, 0); |
|
} else { |
|
atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN); |
|
error = thaw_super(sb); |
|
if (error) { |
|
fs_info(sdp, "GFS2: couldn't thaw filesystem: %d\n", |
|
error); |
|
gfs2_assert_withdraw(sdp, 0); |
|
} |
|
gfs2_freeze_unlock(&freeze_gh); |
|
} |
|
deactivate_super(sb); |
|
clear_bit_unlock(SDF_FS_FROZEN, &sdp->sd_flags); |
|
wake_up_bit(&sdp->sd_flags, SDF_FS_FROZEN); |
|
return; |
|
} |
|
|
|
/** |
|
* gfs2_freeze - prevent further writes to the filesystem |
|
* @sb: the VFS structure for the filesystem |
|
* |
|
*/ |
|
|
|
static int gfs2_freeze(struct super_block *sb) |
|
{ |
|
struct gfs2_sbd *sdp = sb->s_fs_info; |
|
int error; |
|
|
|
mutex_lock(&sdp->sd_freeze_mutex); |
|
if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN) { |
|
error = -EBUSY; |
|
goto out; |
|
} |
|
|
|
for (;;) { |
|
if (gfs2_withdrawn(sdp)) { |
|
error = -EINVAL; |
|
goto out; |
|
} |
|
|
|
error = gfs2_lock_fs_check_clean(sdp); |
|
if (!error) |
|
break; |
|
|
|
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); |
|
} |
|
set_bit(SDF_FS_FROZEN, &sdp->sd_flags); |
|
out: |
|
mutex_unlock(&sdp->sd_freeze_mutex); |
|
return error; |
|
} |
|
|
|
/** |
|
* gfs2_unfreeze - reallow writes to the filesystem |
|
* @sb: the VFS structure for the filesystem |
|
* |
|
*/ |
|
|
|
static int gfs2_unfreeze(struct super_block *sb) |
|
{ |
|
struct gfs2_sbd *sdp = sb->s_fs_info; |
|
|
|
mutex_lock(&sdp->sd_freeze_mutex); |
|
if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN || |
|
!gfs2_holder_initialized(&sdp->sd_freeze_gh)) { |
|
mutex_unlock(&sdp->sd_freeze_mutex); |
|
return -EINVAL; |
|
} |
|
|
|
gfs2_freeze_unlock(&sdp->sd_freeze_gh); |
|
mutex_unlock(&sdp->sd_freeze_mutex); |
|
return wait_on_bit(&sdp->sd_flags, SDF_FS_FROZEN, TASK_INTERRUPTIBLE); |
|
} |
|
|
|
/** |
|
* 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); |
|
|
|
if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) && |
|
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_delete_work(gl, 0)) |
|
gfs2_glock_queue_put(gl); |
|
return 0; |
|
} |
|
|
|
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; |
|
int val; |
|
|
|
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; |
|
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"); |
|
val = sdp->sd_tune.gt_logd_secs; |
|
if (val != 30) |
|
seq_printf(s, ",commit=%d", val); |
|
val = sdp->sd_tune.gt_statfs_quantum; |
|
if (val != 30) |
|
seq_printf(s, ",statfs_quantum=%d", val); |
|
else if (sdp->sd_tune.gt_statfs_slow) |
|
seq_puts(s, ",statfs_quantum=0"); |
|
val = sdp->sd_tune.gt_quota_quantum; |
|
if (val != 60) |
|
seq_printf(s, ",quota_quantum=%d", val); |
|
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; |
|
|
|
truncate_inode_pages(gfs2_glock2aspace(ip->i_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; |
|
} |
|
|
|
error = gfs2_rindex_update(sdp); |
|
if (error) |
|
return error; |
|
|
|
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'll get the lock immediately. |
|
* Otherwise, the other nodes holding the lock will be notified about |
|
* our locking request. If they don't have the inode open, they'll |
|
* evict the cached inode and release the lock. Otherwise, if they |
|
* poke the inode glock, we'll take this as an indication that they |
|
* still need the iopen glock and that they'll take care of deleting |
|
* the inode when they're done. As a last resort, if another node |
|
* keeps holding the iopen glock without showing any activity on the |
|
* inode glock, we'll eventually time out. |
|
* |
|
* 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 (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) { |
|
BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl)); |
|
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; |
|
} |
|
|
|
/* We're about to clear the bitmap for the dinode, but as soon as we |
|
do, gfs2_create_inode can create another inode at the same block |
|
location and try to set gl_object again. We clear gl_object here so |
|
that subsequent inode creates don't see an old gl_object. */ |
|
glock_clear_object(ip->i_gl, ip); |
|
ret = gfs2_dinode_dealloc(ip); |
|
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 (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) { |
|
clear_inode(inode); |
|
return; |
|
} |
|
|
|
if (inode->i_nlink || sb_rdonly(sb)) |
|
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)) { |
|
glock_clear_object(ip->i_gl, ip); |
|
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); |
|
if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) { |
|
ip->i_iopen_gh.gh_flags |= GL_NOCACHE; |
|
gfs2_glock_dq(&ip->i_iopen_gh); |
|
} |
|
gfs2_glock_hold(gl); |
|
gfs2_holder_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_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, |
|
.thaw_super = gfs2_unfreeze, |
|
.statfs = gfs2_statfs, |
|
.drop_inode = gfs2_drop_inode, |
|
.show_options = gfs2_show_options, |
|
}; |
|
|
|
|