![Bob Peterson](/assets/img/avatar_default.png)
This patch removes a redundant metadata block check. See description below. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
596 lines
15 KiB
C
596 lines
15 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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#include <linux/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/gfs2_ondisk.h>
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#include <linux/bio.h>
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#include <linux/posix_acl.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 "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 "recovery.h"
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#include "rgrp.h"
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#include "util.h"
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#include "trans.h"
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#include "dir.h"
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static void gfs2_ail_error(struct gfs2_glock *gl, const struct buffer_head *bh)
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{
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fs_err(gl->gl_sbd, "AIL buffer %p: blocknr %llu state 0x%08lx mapping %p page state 0x%lx\n",
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bh, (unsigned long long)bh->b_blocknr, bh->b_state,
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bh->b_page->mapping, bh->b_page->flags);
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fs_err(gl->gl_sbd, "AIL glock %u:%llu mapping %p\n",
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gl->gl_name.ln_type, gl->gl_name.ln_number,
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gfs2_glock2aspace(gl));
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gfs2_lm_withdraw(gl->gl_sbd, "AIL error\n");
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}
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/**
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* __gfs2_ail_flush - remove all buffers for a given lock from the AIL
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* @gl: the glock
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* @fsync: set when called from fsync (not all buffers will be clean)
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*
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* None of the buffers should be dirty, locked, or pinned.
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*/
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static void __gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
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{
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struct gfs2_sbd *sdp = gl->gl_sbd;
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struct list_head *head = &gl->gl_ail_list;
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struct gfs2_bufdata *bd, *tmp;
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struct buffer_head *bh;
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const unsigned long b_state = (1UL << BH_Dirty)|(1UL << BH_Pinned)|(1UL << BH_Lock);
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sector_t blocknr;
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gfs2_log_lock(sdp);
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spin_lock(&sdp->sd_ail_lock);
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list_for_each_entry_safe(bd, tmp, head, bd_ail_gl_list) {
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bh = bd->bd_bh;
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if (bh->b_state & b_state) {
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if (fsync)
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continue;
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gfs2_ail_error(gl, bh);
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}
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blocknr = bh->b_blocknr;
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bh->b_private = NULL;
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gfs2_remove_from_ail(bd); /* drops ref on bh */
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bd->bd_bh = NULL;
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bd->bd_blkno = blocknr;
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gfs2_trans_add_revoke(sdp, bd);
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}
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BUG_ON(!fsync && atomic_read(&gl->gl_ail_count));
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spin_unlock(&sdp->sd_ail_lock);
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gfs2_log_unlock(sdp);
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}
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static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
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{
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struct gfs2_sbd *sdp = gl->gl_sbd;
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struct gfs2_trans tr;
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memset(&tr, 0, sizeof(tr));
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tr.tr_revokes = atomic_read(&gl->gl_ail_count);
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if (!tr.tr_revokes)
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return;
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/* A shortened, inline version of gfs2_trans_begin() */
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tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
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tr.tr_ip = (unsigned long)__builtin_return_address(0);
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gfs2_log_reserve(sdp, tr.tr_reserved);
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BUG_ON(current->journal_info);
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current->journal_info = &tr;
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__gfs2_ail_flush(gl, 0);
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gfs2_trans_end(sdp);
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gfs2_log_flush(sdp, NULL);
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}
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void gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
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{
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struct gfs2_sbd *sdp = gl->gl_sbd;
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unsigned int revokes = atomic_read(&gl->gl_ail_count);
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int ret;
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if (!revokes)
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return;
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ret = gfs2_trans_begin(sdp, 0, revokes);
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if (ret)
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return;
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__gfs2_ail_flush(gl, fsync);
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gfs2_trans_end(sdp);
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gfs2_log_flush(sdp, NULL);
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}
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/**
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* rgrp_go_sync - sync out the metadata for this glock
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* @gl: the glock
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*
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* Called when demoting or unlocking an EX glock. We must flush
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* to disk all dirty buffers/pages relating to this glock, and must not
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* not return to caller to demote/unlock the glock until I/O is complete.
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*/
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static void rgrp_go_sync(struct gfs2_glock *gl)
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{
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struct address_space *metamapping = gfs2_glock2aspace(gl);
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struct gfs2_rgrpd *rgd;
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int error;
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if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
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return;
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BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
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gfs2_log_flush(gl->gl_sbd, gl);
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filemap_fdatawrite(metamapping);
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error = filemap_fdatawait(metamapping);
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mapping_set_error(metamapping, error);
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gfs2_ail_empty_gl(gl);
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spin_lock(&gl->gl_spin);
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rgd = gl->gl_object;
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if (rgd)
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gfs2_free_clones(rgd);
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spin_unlock(&gl->gl_spin);
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}
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/**
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* rgrp_go_inval - invalidate the metadata for this glock
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* @gl: the glock
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* @flags:
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*
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* We never used LM_ST_DEFERRED with resource groups, so that we
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* should always see the metadata flag set here.
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*
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*/
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static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
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{
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struct address_space *mapping = gfs2_glock2aspace(gl);
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BUG_ON(!(flags & DIO_METADATA));
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gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
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truncate_inode_pages(mapping, 0);
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if (gl->gl_object) {
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struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
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rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
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}
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}
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/**
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* inode_go_sync - Sync the dirty data and/or metadata for an inode glock
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* @gl: the glock protecting the inode
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*
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*/
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static void inode_go_sync(struct gfs2_glock *gl)
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{
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struct gfs2_inode *ip = gl->gl_object;
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struct address_space *metamapping = gfs2_glock2aspace(gl);
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int error;
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if (ip && !S_ISREG(ip->i_inode.i_mode))
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ip = NULL;
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if (ip && test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
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unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
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if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
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return;
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BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
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gfs2_log_flush(gl->gl_sbd, gl);
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filemap_fdatawrite(metamapping);
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if (ip) {
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struct address_space *mapping = ip->i_inode.i_mapping;
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filemap_fdatawrite(mapping);
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error = filemap_fdatawait(mapping);
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mapping_set_error(mapping, error);
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}
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error = filemap_fdatawait(metamapping);
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mapping_set_error(metamapping, error);
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gfs2_ail_empty_gl(gl);
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/*
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* Writeback of the data mapping may cause the dirty flag to be set
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* so we have to clear it again here.
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*/
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smp_mb__before_clear_bit();
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clear_bit(GLF_DIRTY, &gl->gl_flags);
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}
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/**
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* inode_go_inval - prepare a inode glock to be released
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* @gl: the glock
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* @flags:
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*
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* Normally we invlidate everything, but if we are moving into
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* LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
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* can keep hold of the metadata, since it won't have changed.
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*
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*/
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static void inode_go_inval(struct gfs2_glock *gl, int flags)
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{
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struct gfs2_inode *ip = gl->gl_object;
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gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
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if (flags & DIO_METADATA) {
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struct address_space *mapping = gfs2_glock2aspace(gl);
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truncate_inode_pages(mapping, 0);
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if (ip) {
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set_bit(GIF_INVALID, &ip->i_flags);
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forget_all_cached_acls(&ip->i_inode);
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gfs2_dir_hash_inval(ip);
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}
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}
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if (ip == GFS2_I(gl->gl_sbd->sd_rindex)) {
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gfs2_log_flush(gl->gl_sbd, NULL);
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gl->gl_sbd->sd_rindex_uptodate = 0;
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}
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if (ip && S_ISREG(ip->i_inode.i_mode))
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truncate_inode_pages(ip->i_inode.i_mapping, 0);
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}
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/**
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* inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
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* @gl: the glock
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*
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* Returns: 1 if it's ok
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*/
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static int inode_go_demote_ok(const struct gfs2_glock *gl)
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{
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struct gfs2_sbd *sdp = gl->gl_sbd;
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struct gfs2_holder *gh;
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if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
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return 0;
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if (!list_empty(&gl->gl_holders)) {
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gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list);
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if (gh->gh_list.next != &gl->gl_holders)
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return 0;
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}
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return 1;
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}
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/**
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* gfs2_set_nlink - Set the inode's link count based on on-disk info
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* @inode: The inode in question
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* @nlink: The link count
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*
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* If the link count has hit zero, it must never be raised, whatever the
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* on-disk inode might say. When new struct inodes are created the link
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* count is set to 1, so that we can safely use this test even when reading
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* in on disk information for the first time.
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*/
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static void gfs2_set_nlink(struct inode *inode, u32 nlink)
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{
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/*
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* We will need to review setting the nlink count here in the
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* light of the forthcoming ro bind mount work. This is a reminder
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* to do that.
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*/
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if ((inode->i_nlink != nlink) && (inode->i_nlink != 0)) {
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if (nlink == 0)
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clear_nlink(inode);
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else
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set_nlink(inode, nlink);
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}
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}
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static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
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{
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const struct gfs2_dinode *str = buf;
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struct timespec atime;
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u16 height, depth;
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if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)))
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goto corrupt;
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ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino);
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ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
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ip->i_inode.i_rdev = 0;
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switch (ip->i_inode.i_mode & S_IFMT) {
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case S_IFBLK:
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case S_IFCHR:
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ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
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be32_to_cpu(str->di_minor));
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break;
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};
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ip->i_inode.i_uid = be32_to_cpu(str->di_uid);
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ip->i_inode.i_gid = be32_to_cpu(str->di_gid);
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gfs2_set_nlink(&ip->i_inode, be32_to_cpu(str->di_nlink));
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i_size_write(&ip->i_inode, be64_to_cpu(str->di_size));
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gfs2_set_inode_blocks(&ip->i_inode, be64_to_cpu(str->di_blocks));
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atime.tv_sec = be64_to_cpu(str->di_atime);
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atime.tv_nsec = be32_to_cpu(str->di_atime_nsec);
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if (timespec_compare(&ip->i_inode.i_atime, &atime) < 0)
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ip->i_inode.i_atime = atime;
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ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
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ip->i_inode.i_mtime.tv_nsec = be32_to_cpu(str->di_mtime_nsec);
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ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
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ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec);
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ip->i_goal = be64_to_cpu(str->di_goal_meta);
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ip->i_generation = be64_to_cpu(str->di_generation);
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ip->i_diskflags = be32_to_cpu(str->di_flags);
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ip->i_eattr = be64_to_cpu(str->di_eattr);
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/* i_diskflags and i_eattr must be set before gfs2_set_inode_flags() */
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gfs2_set_inode_flags(&ip->i_inode);
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height = be16_to_cpu(str->di_height);
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if (unlikely(height > GFS2_MAX_META_HEIGHT))
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goto corrupt;
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ip->i_height = (u8)height;
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depth = be16_to_cpu(str->di_depth);
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if (unlikely(depth > GFS2_DIR_MAX_DEPTH))
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goto corrupt;
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ip->i_depth = (u8)depth;
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ip->i_entries = be32_to_cpu(str->di_entries);
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if (S_ISREG(ip->i_inode.i_mode))
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gfs2_set_aops(&ip->i_inode);
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return 0;
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corrupt:
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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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* gfs2_inode_refresh - Refresh the incore copy of the dinode
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* @ip: The GFS2 inode
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*
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* Returns: errno
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*/
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int gfs2_inode_refresh(struct gfs2_inode *ip)
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{
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struct buffer_head *dibh;
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int error;
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error = gfs2_meta_inode_buffer(ip, &dibh);
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if (error)
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return error;
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error = gfs2_dinode_in(ip, dibh->b_data);
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brelse(dibh);
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clear_bit(GIF_INVALID, &ip->i_flags);
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return error;
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}
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/**
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* inode_go_lock - operation done after an inode lock is locked by a process
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* @gl: the glock
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* @flags:
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*
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* Returns: errno
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*/
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static int inode_go_lock(struct gfs2_holder *gh)
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{
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struct gfs2_glock *gl = gh->gh_gl;
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struct gfs2_sbd *sdp = gl->gl_sbd;
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struct gfs2_inode *ip = gl->gl_object;
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int error = 0;
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if (!ip || (gh->gh_flags & GL_SKIP))
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return 0;
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if (test_bit(GIF_INVALID, &ip->i_flags)) {
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error = gfs2_inode_refresh(ip);
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if (error)
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return error;
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}
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if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
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(gl->gl_state == LM_ST_EXCLUSIVE) &&
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(gh->gh_state == LM_ST_EXCLUSIVE)) {
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spin_lock(&sdp->sd_trunc_lock);
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if (list_empty(&ip->i_trunc_list))
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list_add(&sdp->sd_trunc_list, &ip->i_trunc_list);
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spin_unlock(&sdp->sd_trunc_lock);
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wake_up(&sdp->sd_quota_wait);
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return 1;
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}
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return error;
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}
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/**
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* inode_go_dump - print information about an inode
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* @seq: The iterator
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* @ip: the inode
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*
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* Returns: 0 on success, -ENOBUFS when we run out of space
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*/
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static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
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{
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const struct gfs2_inode *ip = gl->gl_object;
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if (ip == NULL)
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return 0;
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gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu\n",
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(unsigned long long)ip->i_no_formal_ino,
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(unsigned long long)ip->i_no_addr,
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IF2DT(ip->i_inode.i_mode), ip->i_flags,
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(unsigned int)ip->i_diskflags,
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(unsigned long long)i_size_read(&ip->i_inode));
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return 0;
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}
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/**
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* trans_go_sync - promote/demote the transaction glock
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* @gl: the glock
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* @state: the requested state
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* @flags:
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*
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*/
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static void trans_go_sync(struct gfs2_glock *gl)
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{
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struct gfs2_sbd *sdp = gl->gl_sbd;
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if (gl->gl_state != LM_ST_UNLOCKED &&
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test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
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gfs2_meta_syncfs(sdp);
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gfs2_log_shutdown(sdp);
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}
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}
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/**
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* trans_go_xmote_bh - After promoting/demoting the transaction glock
|
|
* @gl: the glock
|
|
*
|
|
*/
|
|
|
|
static int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
|
|
{
|
|
struct gfs2_sbd *sdp = gl->gl_sbd;
|
|
struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
|
|
struct gfs2_glock *j_gl = ip->i_gl;
|
|
struct gfs2_log_header_host head;
|
|
int error;
|
|
|
|
if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
|
|
j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
|
|
|
|
error = gfs2_find_jhead(sdp->sd_jdesc, &head);
|
|
if (error)
|
|
gfs2_consist(sdp);
|
|
if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
|
|
gfs2_consist(sdp);
|
|
|
|
/* Initialize some head of the log stuff */
|
|
if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
|
|
sdp->sd_log_sequence = head.lh_sequence + 1;
|
|
gfs2_log_pointers_init(sdp, head.lh_blkno);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* trans_go_demote_ok
|
|
* @gl: the glock
|
|
*
|
|
* Always returns 0
|
|
*/
|
|
|
|
static int trans_go_demote_ok(const struct gfs2_glock *gl)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* iopen_go_callback - schedule the dcache entry for the inode to be deleted
|
|
* @gl: the glock
|
|
*
|
|
* gl_spin lock is held while calling this
|
|
*/
|
|
static void iopen_go_callback(struct gfs2_glock *gl)
|
|
{
|
|
struct gfs2_inode *ip = (struct gfs2_inode *)gl->gl_object;
|
|
struct gfs2_sbd *sdp = gl->gl_sbd;
|
|
|
|
if (sdp->sd_vfs->s_flags & MS_RDONLY)
|
|
return;
|
|
|
|
if (gl->gl_demote_state == LM_ST_UNLOCKED &&
|
|
gl->gl_state == LM_ST_SHARED && ip) {
|
|
gfs2_glock_hold(gl);
|
|
if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
|
|
gfs2_glock_put_nolock(gl);
|
|
}
|
|
}
|
|
|
|
const struct gfs2_glock_operations gfs2_meta_glops = {
|
|
.go_type = LM_TYPE_META,
|
|
};
|
|
|
|
const struct gfs2_glock_operations gfs2_inode_glops = {
|
|
.go_xmote_th = inode_go_sync,
|
|
.go_inval = inode_go_inval,
|
|
.go_demote_ok = inode_go_demote_ok,
|
|
.go_lock = inode_go_lock,
|
|
.go_dump = inode_go_dump,
|
|
.go_type = LM_TYPE_INODE,
|
|
.go_flags = GLOF_ASPACE,
|
|
};
|
|
|
|
const struct gfs2_glock_operations gfs2_rgrp_glops = {
|
|
.go_xmote_th = rgrp_go_sync,
|
|
.go_inval = rgrp_go_inval,
|
|
.go_lock = gfs2_rgrp_go_lock,
|
|
.go_unlock = gfs2_rgrp_go_unlock,
|
|
.go_dump = gfs2_rgrp_dump,
|
|
.go_type = LM_TYPE_RGRP,
|
|
.go_flags = GLOF_ASPACE,
|
|
};
|
|
|
|
const struct gfs2_glock_operations gfs2_trans_glops = {
|
|
.go_xmote_th = trans_go_sync,
|
|
.go_xmote_bh = trans_go_xmote_bh,
|
|
.go_demote_ok = trans_go_demote_ok,
|
|
.go_type = LM_TYPE_NONDISK,
|
|
};
|
|
|
|
const struct gfs2_glock_operations gfs2_iopen_glops = {
|
|
.go_type = LM_TYPE_IOPEN,
|
|
.go_callback = iopen_go_callback,
|
|
};
|
|
|
|
const struct gfs2_glock_operations gfs2_flock_glops = {
|
|
.go_type = LM_TYPE_FLOCK,
|
|
};
|
|
|
|
const struct gfs2_glock_operations gfs2_nondisk_glops = {
|
|
.go_type = LM_TYPE_NONDISK,
|
|
};
|
|
|
|
const struct gfs2_glock_operations gfs2_quota_glops = {
|
|
.go_type = LM_TYPE_QUOTA,
|
|
};
|
|
|
|
const struct gfs2_glock_operations gfs2_journal_glops = {
|
|
.go_type = LM_TYPE_JOURNAL,
|
|
};
|
|
|
|
const struct gfs2_glock_operations *gfs2_glops_list[] = {
|
|
[LM_TYPE_META] = &gfs2_meta_glops,
|
|
[LM_TYPE_INODE] = &gfs2_inode_glops,
|
|
[LM_TYPE_RGRP] = &gfs2_rgrp_glops,
|
|
[LM_TYPE_IOPEN] = &gfs2_iopen_glops,
|
|
[LM_TYPE_FLOCK] = &gfs2_flock_glops,
|
|
[LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
|
|
[LM_TYPE_QUOTA] = &gfs2_quota_glops,
|
|
[LM_TYPE_JOURNAL] = &gfs2_journal_glops,
|
|
};
|
|
|