![Steven Whitehouse](/assets/img/avatar_default.png)
The ability to mark files for direct i/o access when opened normally is both unused and pointless, so this patch removes support for that feature. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
1020 lines
24 KiB
C
1020 lines
24 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/crc32.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/bio.h>
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#include <linux/lm_interface.h>
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#include "gfs2.h"
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#include "incore.h"
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#include "bmap.h"
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#include "dir.h"
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#include "glock.h"
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#include "glops.h"
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#include "inode.h"
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#include "log.h"
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#include "meta_io.h"
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#include "quota.h"
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#include "recovery.h"
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#include "rgrp.h"
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#include "super.h"
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#include "trans.h"
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#include "util.h"
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static const u32 gfs2_old_fs_formats[] = {
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0
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};
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static const u32 gfs2_old_multihost_formats[] = {
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0
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};
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/**
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* gfs2_tune_init - Fill a gfs2_tune structure with default values
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* @gt: tune
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*
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*/
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void gfs2_tune_init(struct gfs2_tune *gt)
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{
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spin_lock_init(>->gt_spin);
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gt->gt_demote_secs = 300;
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gt->gt_incore_log_blocks = 1024;
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gt->gt_log_flush_secs = 60;
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gt->gt_recoverd_secs = 60;
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gt->gt_logd_secs = 1;
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gt->gt_quotad_secs = 5;
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gt->gt_quota_simul_sync = 64;
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gt->gt_quota_warn_period = 10;
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gt->gt_quota_scale_num = 1;
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gt->gt_quota_scale_den = 1;
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gt->gt_quota_cache_secs = 300;
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gt->gt_quota_quantum = 60;
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gt->gt_atime_quantum = 3600;
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gt->gt_new_files_jdata = 0;
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gt->gt_max_readahead = 1 << 18;
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gt->gt_stall_secs = 600;
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gt->gt_complain_secs = 10;
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gt->gt_statfs_quantum = 30;
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gt->gt_statfs_slow = 0;
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}
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/**
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* gfs2_check_sb - Check superblock
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* @sdp: the filesystem
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* @sb: The superblock
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* @silent: Don't print a message if the check fails
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*
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* Checks the version code of the FS is one that we understand how to
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* read and that the sizes of the various on-disk structures have not
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* changed.
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*/
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int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb_host *sb, int silent)
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{
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unsigned int x;
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if (sb->sb_magic != GFS2_MAGIC ||
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sb->sb_type != GFS2_METATYPE_SB) {
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if (!silent)
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printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
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return -EINVAL;
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}
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/* If format numbers match exactly, we're done. */
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if (sb->sb_fs_format == GFS2_FORMAT_FS &&
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sb->sb_multihost_format == GFS2_FORMAT_MULTI)
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return 0;
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if (sb->sb_fs_format != GFS2_FORMAT_FS) {
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for (x = 0; gfs2_old_fs_formats[x]; x++)
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if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
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break;
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if (!gfs2_old_fs_formats[x]) {
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printk(KERN_WARNING
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"GFS2: code version (%u, %u) is incompatible "
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"with ondisk format (%u, %u)\n",
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GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
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sb->sb_fs_format, sb->sb_multihost_format);
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printk(KERN_WARNING
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"GFS2: I don't know how to upgrade this FS\n");
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return -EINVAL;
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}
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}
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if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
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for (x = 0; gfs2_old_multihost_formats[x]; x++)
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if (gfs2_old_multihost_formats[x] ==
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sb->sb_multihost_format)
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break;
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if (!gfs2_old_multihost_formats[x]) {
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printk(KERN_WARNING
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"GFS2: code version (%u, %u) is incompatible "
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"with ondisk format (%u, %u)\n",
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GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
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sb->sb_fs_format, sb->sb_multihost_format);
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printk(KERN_WARNING
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"GFS2: I don't know how to upgrade this FS\n");
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return -EINVAL;
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}
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}
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if (!sdp->sd_args.ar_upgrade) {
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printk(KERN_WARNING
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"GFS2: code version (%u, %u) is incompatible "
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"with ondisk format (%u, %u)\n",
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GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
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sb->sb_fs_format, sb->sb_multihost_format);
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printk(KERN_INFO
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"GFS2: Use the \"upgrade\" mount option to upgrade "
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"the FS\n");
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printk(KERN_INFO "GFS2: See the manual for more details\n");
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return -EINVAL;
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}
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return 0;
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}
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static void end_bio_io_page(struct bio *bio, int error)
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{
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struct page *page = bio->bi_private;
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if (!error)
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SetPageUptodate(page);
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else
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printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
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unlock_page(page);
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}
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static void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf)
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{
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const struct gfs2_sb *str = buf;
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sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
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sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
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sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
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sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
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sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
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sb->sb_bsize = be32_to_cpu(str->sb_bsize);
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sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
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sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
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sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
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sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
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sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
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memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
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memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
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}
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/**
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* gfs2_read_super - Read the gfs2 super block from disk
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* @sdp: The GFS2 super block
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* @sector: The location of the super block
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* @error: The error code to return
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*
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* This uses the bio functions to read the super block from disk
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* because we want to be 100% sure that we never read cached data.
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* A super block is read twice only during each GFS2 mount and is
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* never written to by the filesystem. The first time its read no
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* locks are held, and the only details which are looked at are those
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* relating to the locking protocol. Once locking is up and working,
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* the sb is read again under the lock to establish the location of
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* the master directory (contains pointers to journals etc) and the
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* root directory.
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*
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* Returns: 0 on success or error
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*/
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int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector)
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{
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struct super_block *sb = sdp->sd_vfs;
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struct gfs2_sb *p;
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struct page *page;
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struct bio *bio;
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page = alloc_page(GFP_NOFS);
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if (unlikely(!page))
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return -ENOBUFS;
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ClearPageUptodate(page);
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ClearPageDirty(page);
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lock_page(page);
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bio = bio_alloc(GFP_NOFS, 1);
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if (unlikely(!bio)) {
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__free_page(page);
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return -ENOBUFS;
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}
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bio->bi_sector = sector * (sb->s_blocksize >> 9);
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bio->bi_bdev = sb->s_bdev;
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bio_add_page(bio, page, PAGE_SIZE, 0);
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bio->bi_end_io = end_bio_io_page;
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bio->bi_private = page;
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submit_bio(READ_SYNC | (1 << BIO_RW_META), bio);
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wait_on_page_locked(page);
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bio_put(bio);
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if (!PageUptodate(page)) {
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__free_page(page);
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return -EIO;
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}
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p = kmap(page);
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gfs2_sb_in(&sdp->sd_sb, p);
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kunmap(page);
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__free_page(page);
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return 0;
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}
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/**
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* gfs2_read_sb - Read super block
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* @sdp: The GFS2 superblock
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* @gl: the glock for the superblock (assumed to be held)
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* @silent: Don't print message if mount fails
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*
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*/
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int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, int silent)
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{
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u32 hash_blocks, ind_blocks, leaf_blocks;
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u32 tmp_blocks;
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unsigned int x;
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int error;
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error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
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if (error) {
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if (!silent)
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fs_err(sdp, "can't read superblock\n");
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return error;
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}
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error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
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if (error)
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return error;
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sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
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GFS2_BASIC_BLOCK_SHIFT;
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sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
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sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
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sizeof(struct gfs2_dinode)) / sizeof(u64);
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sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
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sizeof(struct gfs2_meta_header)) / sizeof(u64);
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sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
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sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
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sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
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sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
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sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
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sizeof(struct gfs2_meta_header)) /
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sizeof(struct gfs2_quota_change);
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/* Compute maximum reservation required to add a entry to a directory */
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hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
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sdp->sd_jbsize);
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ind_blocks = 0;
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for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
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tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
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ind_blocks += tmp_blocks;
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}
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leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
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sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
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sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
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sizeof(struct gfs2_dinode);
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sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
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for (x = 2;; x++) {
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u64 space, d;
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u32 m;
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space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
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d = space;
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m = do_div(d, sdp->sd_inptrs);
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if (d != sdp->sd_heightsize[x - 1] || m)
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break;
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sdp->sd_heightsize[x] = space;
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}
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sdp->sd_max_height = x;
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sdp->sd_heightsize[x] = ~0;
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gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
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sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
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sizeof(struct gfs2_dinode);
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sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
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for (x = 2;; x++) {
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u64 space, d;
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u32 m;
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space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
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d = space;
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m = do_div(d, sdp->sd_inptrs);
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if (d != sdp->sd_jheightsize[x - 1] || m)
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break;
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sdp->sd_jheightsize[x] = space;
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}
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sdp->sd_max_jheight = x;
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sdp->sd_jheightsize[x] = ~0;
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gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
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return 0;
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}
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/**
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* gfs2_jindex_hold - Grab a lock on the jindex
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* @sdp: The GFS2 superblock
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* @ji_gh: the holder for the jindex glock
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*
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* This is very similar to the gfs2_rindex_hold() function, except that
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* in general we hold the jindex lock for longer periods of time and
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* we grab it far less frequently (in general) then the rgrp lock.
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*
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* Returns: errno
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*/
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int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
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{
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struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
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struct qstr name;
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char buf[20];
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struct gfs2_jdesc *jd;
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int error;
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name.name = buf;
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mutex_lock(&sdp->sd_jindex_mutex);
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for (;;) {
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error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
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if (error)
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break;
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name.len = sprintf(buf, "journal%u", sdp->sd_journals);
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name.hash = gfs2_disk_hash(name.name, name.len);
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error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
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if (error == -ENOENT) {
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error = 0;
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break;
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}
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gfs2_glock_dq_uninit(ji_gh);
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if (error)
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break;
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error = -ENOMEM;
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jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
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if (!jd)
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break;
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INIT_LIST_HEAD(&jd->extent_list);
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jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1, NULL);
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if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
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if (!jd->jd_inode)
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error = -ENOENT;
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else
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error = PTR_ERR(jd->jd_inode);
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kfree(jd);
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break;
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}
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spin_lock(&sdp->sd_jindex_spin);
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jd->jd_jid = sdp->sd_journals++;
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list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
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spin_unlock(&sdp->sd_jindex_spin);
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}
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mutex_unlock(&sdp->sd_jindex_mutex);
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return error;
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}
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/**
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* gfs2_jindex_free - Clear all the journal index information
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* @sdp: The GFS2 superblock
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*
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*/
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void gfs2_jindex_free(struct gfs2_sbd *sdp)
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{
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struct list_head list, *head;
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struct gfs2_jdesc *jd;
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struct gfs2_journal_extent *jext;
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spin_lock(&sdp->sd_jindex_spin);
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list_add(&list, &sdp->sd_jindex_list);
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list_del_init(&sdp->sd_jindex_list);
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sdp->sd_journals = 0;
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spin_unlock(&sdp->sd_jindex_spin);
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while (!list_empty(&list)) {
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jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
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head = &jd->extent_list;
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while (!list_empty(head)) {
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jext = list_entry(head->next,
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struct gfs2_journal_extent,
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extent_list);
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list_del(&jext->extent_list);
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kfree(jext);
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}
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list_del(&jd->jd_list);
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iput(jd->jd_inode);
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kfree(jd);
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}
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}
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static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
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{
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struct gfs2_jdesc *jd;
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int found = 0;
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list_for_each_entry(jd, head, jd_list) {
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if (jd->jd_jid == jid) {
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found = 1;
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break;
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}
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}
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if (!found)
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jd = NULL;
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return jd;
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}
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struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
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{
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struct gfs2_jdesc *jd;
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spin_lock(&sdp->sd_jindex_spin);
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jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
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spin_unlock(&sdp->sd_jindex_spin);
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return jd;
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}
|
|
|
|
void gfs2_jdesc_make_dirty(struct gfs2_sbd *sdp, unsigned int jid)
|
|
{
|
|
struct gfs2_jdesc *jd;
|
|
|
|
spin_lock(&sdp->sd_jindex_spin);
|
|
jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
|
|
if (jd)
|
|
jd->jd_dirty = 1;
|
|
spin_unlock(&sdp->sd_jindex_spin);
|
|
}
|
|
|
|
struct gfs2_jdesc *gfs2_jdesc_find_dirty(struct gfs2_sbd *sdp)
|
|
{
|
|
struct gfs2_jdesc *jd;
|
|
int found = 0;
|
|
|
|
spin_lock(&sdp->sd_jindex_spin);
|
|
|
|
list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
|
|
if (jd->jd_dirty) {
|
|
jd->jd_dirty = 0;
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&sdp->sd_jindex_spin);
|
|
|
|
if (!found)
|
|
jd = NULL;
|
|
|
|
return jd;
|
|
}
|
|
|
|
int gfs2_jdesc_check(struct gfs2_jdesc *jd)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
|
|
struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
|
|
int ar;
|
|
int error;
|
|
|
|
if (ip->i_di.di_size < (8 << 20) || ip->i_di.di_size > (1 << 30) ||
|
|
(ip->i_di.di_size & (sdp->sd_sb.sb_bsize - 1))) {
|
|
gfs2_consist_inode(ip);
|
|
return -EIO;
|
|
}
|
|
jd->jd_blocks = ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift;
|
|
|
|
error = gfs2_write_alloc_required(ip, 0, ip->i_di.di_size, &ar);
|
|
if (!error && ar) {
|
|
gfs2_consist_inode(ip);
|
|
error = -EIO;
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
|
|
* @sdp: the filesystem
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
|
|
struct gfs2_glock *j_gl = ip->i_gl;
|
|
struct gfs2_holder t_gh;
|
|
struct gfs2_log_header_host head;
|
|
int error;
|
|
|
|
error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
|
|
if (error)
|
|
return error;
|
|
|
|
j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
|
|
|
|
error = gfs2_find_jhead(sdp->sd_jdesc, &head);
|
|
if (error)
|
|
goto fail;
|
|
|
|
if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
|
|
gfs2_consist(sdp);
|
|
error = -EIO;
|
|
goto fail;
|
|
}
|
|
|
|
/* Initialize some head of the log stuff */
|
|
sdp->sd_log_sequence = head.lh_sequence + 1;
|
|
gfs2_log_pointers_init(sdp, head.lh_blkno);
|
|
|
|
error = gfs2_quota_init(sdp);
|
|
if (error)
|
|
goto fail;
|
|
|
|
set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
|
|
|
|
gfs2_glock_dq_uninit(&t_gh);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
t_gh.gh_flags |= GL_NOCACHE;
|
|
gfs2_glock_dq_uninit(&t_gh);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
|
|
* @sdp: the filesystem
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
|
|
{
|
|
struct gfs2_holder t_gh;
|
|
int error;
|
|
|
|
gfs2_quota_sync(sdp);
|
|
gfs2_statfs_sync(sdp);
|
|
|
|
error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
|
|
&t_gh);
|
|
if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
|
|
return error;
|
|
|
|
gfs2_meta_syncfs(sdp);
|
|
gfs2_log_shutdown(sdp);
|
|
|
|
clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
|
|
|
|
if (t_gh.gh_gl)
|
|
gfs2_glock_dq_uninit(&t_gh);
|
|
|
|
gfs2_quota_cleanup(sdp);
|
|
|
|
return error;
|
|
}
|
|
|
|
static void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
|
|
{
|
|
const struct gfs2_statfs_change *str = buf;
|
|
|
|
sc->sc_total = be64_to_cpu(str->sc_total);
|
|
sc->sc_free = be64_to_cpu(str->sc_free);
|
|
sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
|
|
}
|
|
|
|
static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
|
|
{
|
|
struct gfs2_statfs_change *str = buf;
|
|
|
|
str->sc_total = cpu_to_be64(sc->sc_total);
|
|
str->sc_free = cpu_to_be64(sc->sc_free);
|
|
str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
|
|
}
|
|
|
|
int gfs2_statfs_init(struct gfs2_sbd *sdp)
|
|
{
|
|
struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
|
|
struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
|
|
struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
|
|
struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
|
|
struct buffer_head *m_bh, *l_bh;
|
|
struct gfs2_holder gh;
|
|
int error;
|
|
|
|
error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
|
|
&gh);
|
|
if (error)
|
|
return error;
|
|
|
|
error = gfs2_meta_inode_buffer(m_ip, &m_bh);
|
|
if (error)
|
|
goto out;
|
|
|
|
if (sdp->sd_args.ar_spectator) {
|
|
spin_lock(&sdp->sd_statfs_spin);
|
|
gfs2_statfs_change_in(m_sc, m_bh->b_data +
|
|
sizeof(struct gfs2_dinode));
|
|
spin_unlock(&sdp->sd_statfs_spin);
|
|
} else {
|
|
error = gfs2_meta_inode_buffer(l_ip, &l_bh);
|
|
if (error)
|
|
goto out_m_bh;
|
|
|
|
spin_lock(&sdp->sd_statfs_spin);
|
|
gfs2_statfs_change_in(m_sc, m_bh->b_data +
|
|
sizeof(struct gfs2_dinode));
|
|
gfs2_statfs_change_in(l_sc, l_bh->b_data +
|
|
sizeof(struct gfs2_dinode));
|
|
spin_unlock(&sdp->sd_statfs_spin);
|
|
|
|
brelse(l_bh);
|
|
}
|
|
|
|
out_m_bh:
|
|
brelse(m_bh);
|
|
out:
|
|
gfs2_glock_dq_uninit(&gh);
|
|
return 0;
|
|
}
|
|
|
|
void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
|
|
s64 dinodes)
|
|
{
|
|
struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
|
|
struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
|
|
struct buffer_head *l_bh;
|
|
int error;
|
|
|
|
error = gfs2_meta_inode_buffer(l_ip, &l_bh);
|
|
if (error)
|
|
return;
|
|
|
|
gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
|
|
|
|
spin_lock(&sdp->sd_statfs_spin);
|
|
l_sc->sc_total += total;
|
|
l_sc->sc_free += free;
|
|
l_sc->sc_dinodes += dinodes;
|
|
gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
|
|
spin_unlock(&sdp->sd_statfs_spin);
|
|
|
|
brelse(l_bh);
|
|
}
|
|
|
|
int gfs2_statfs_sync(struct gfs2_sbd *sdp)
|
|
{
|
|
struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
|
|
struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
|
|
struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
|
|
struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
|
|
struct gfs2_holder gh;
|
|
struct buffer_head *m_bh, *l_bh;
|
|
int error;
|
|
|
|
error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
|
|
&gh);
|
|
if (error)
|
|
return error;
|
|
|
|
error = gfs2_meta_inode_buffer(m_ip, &m_bh);
|
|
if (error)
|
|
goto out;
|
|
|
|
spin_lock(&sdp->sd_statfs_spin);
|
|
gfs2_statfs_change_in(m_sc, m_bh->b_data +
|
|
sizeof(struct gfs2_dinode));
|
|
if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
|
|
spin_unlock(&sdp->sd_statfs_spin);
|
|
goto out_bh;
|
|
}
|
|
spin_unlock(&sdp->sd_statfs_spin);
|
|
|
|
error = gfs2_meta_inode_buffer(l_ip, &l_bh);
|
|
if (error)
|
|
goto out_bh;
|
|
|
|
error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
|
|
if (error)
|
|
goto out_bh2;
|
|
|
|
gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
|
|
|
|
spin_lock(&sdp->sd_statfs_spin);
|
|
m_sc->sc_total += l_sc->sc_total;
|
|
m_sc->sc_free += l_sc->sc_free;
|
|
m_sc->sc_dinodes += l_sc->sc_dinodes;
|
|
memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
|
|
memset(l_bh->b_data + sizeof(struct gfs2_dinode),
|
|
0, sizeof(struct gfs2_statfs_change));
|
|
spin_unlock(&sdp->sd_statfs_spin);
|
|
|
|
gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
|
|
gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
|
|
|
|
gfs2_trans_end(sdp);
|
|
|
|
out_bh2:
|
|
brelse(l_bh);
|
|
out_bh:
|
|
brelse(m_bh);
|
|
out:
|
|
gfs2_glock_dq_uninit(&gh);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_statfs_i - Do a statfs
|
|
* @sdp: the filesystem
|
|
* @sg: the sg structure
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* statfs_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_rg.rg_free;
|
|
sc->sc_dinodes += rgd->rd_rg.rg_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
|
|
*/
|
|
|
|
int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
|
|
{
|
|
struct gfs2_holder ri_gh;
|
|
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 = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
|
|
if (!gha)
|
|
return -ENOMEM;
|
|
|
|
error = gfs2_rindex_hold(sdp, &ri_gh);
|
|
if (error)
|
|
goto out;
|
|
|
|
rgd_next = gfs2_rgrpd_get_first(sdp);
|
|
|
|
for (;;) {
|
|
done = 1;
|
|
|
|
for (x = 0; x < slots; x++) {
|
|
gh = gha + x;
|
|
|
|
if (gh->gh_gl && gfs2_glock_poll(gh)) {
|
|
err = gfs2_glock_wait(gh);
|
|
if (err) {
|
|
gfs2_holder_uninit(gh);
|
|
error = err;
|
|
} else {
|
|
if (!error)
|
|
error = statfs_slow_fill(
|
|
gh->gh_gl->gl_object, sc);
|
|
gfs2_glock_dq_uninit(gh);
|
|
}
|
|
}
|
|
|
|
if (gh->gh_gl)
|
|
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();
|
|
}
|
|
|
|
gfs2_glock_dq_uninit(&ri_gh);
|
|
|
|
out:
|
|
kfree(gha);
|
|
return error;
|
|
}
|
|
|
|
struct lfcc {
|
|
struct list_head list;
|
|
struct gfs2_holder gh;
|
|
};
|
|
|
|
/**
|
|
* gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
|
|
* journals are clean
|
|
* @sdp: the file system
|
|
* @state: the state to put the transaction lock into
|
|
* @t_gh: the hold on the transaction lock
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
|
|
struct gfs2_holder *t_gh)
|
|
{
|
|
struct gfs2_inode *ip;
|
|
struct gfs2_holder ji_gh;
|
|
struct gfs2_jdesc *jd;
|
|
struct lfcc *lfcc;
|
|
LIST_HEAD(list);
|
|
struct gfs2_log_header_host lh;
|
|
int error;
|
|
|
|
error = gfs2_jindex_hold(sdp, &ji_gh);
|
|
if (error)
|
|
return error;
|
|
|
|
list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
|
|
lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
|
|
if (!lfcc) {
|
|
error = -ENOMEM;
|
|
goto out;
|
|
}
|
|
ip = GFS2_I(jd->jd_inode);
|
|
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
|
|
if (error) {
|
|
kfree(lfcc);
|
|
goto out;
|
|
}
|
|
list_add(&lfcc->list, &list);
|
|
}
|
|
|
|
error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
|
|
GL_NOCACHE, t_gh);
|
|
|
|
list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
|
|
error = gfs2_jdesc_check(jd);
|
|
if (error)
|
|
break;
|
|
error = gfs2_find_jhead(jd, &lh);
|
|
if (error)
|
|
break;
|
|
if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
|
|
error = -EBUSY;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (error)
|
|
gfs2_glock_dq_uninit(t_gh);
|
|
|
|
out:
|
|
while (!list_empty(&list)) {
|
|
lfcc = list_entry(list.next, struct lfcc, list);
|
|
list_del(&lfcc->list);
|
|
gfs2_glock_dq_uninit(&lfcc->gh);
|
|
kfree(lfcc);
|
|
}
|
|
gfs2_glock_dq_uninit(&ji_gh);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_freeze_fs - freezes the file system
|
|
* @sdp: the file system
|
|
*
|
|
* This function flushes data and meta data for all machines by
|
|
* aquiring the transaction log exclusively. All journals are
|
|
* ensured to be in a clean state as well.
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
int gfs2_freeze_fs(struct gfs2_sbd *sdp)
|
|
{
|
|
int error = 0;
|
|
|
|
mutex_lock(&sdp->sd_freeze_lock);
|
|
|
|
if (!sdp->sd_freeze_count++) {
|
|
error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
|
|
if (error)
|
|
sdp->sd_freeze_count--;
|
|
}
|
|
|
|
mutex_unlock(&sdp->sd_freeze_lock);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_unfreeze_fs - unfreezes the file system
|
|
* @sdp: the file system
|
|
*
|
|
* This function allows the file system to proceed by unlocking
|
|
* the exclusively held transaction lock. Other GFS2 nodes are
|
|
* now free to acquire the lock shared and go on with their lives.
|
|
*
|
|
*/
|
|
|
|
void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
|
|
{
|
|
mutex_lock(&sdp->sd_freeze_lock);
|
|
|
|
if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
|
|
gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
|
|
|
|
mutex_unlock(&sdp->sd_freeze_lock);
|
|
}
|
|
|