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![Steven Whitehouse](/assets/img/avatar_default.png)
This makes mount take slightly longer, but at the same time, the first write to the filesystem will be faster too. It also means that if there is a problem in the resource index, then we can refuse to mount rather than having to try and report that when the first write occurs. In addition, to avoid recursive locking, we hvae to take account of instances when the rindex glock may already be held when we are trying to update the rbtree of resource groups. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
1413 lines
35 KiB
C
1413 lines
35 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/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/blkdev.h>
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#include <linux/kthread.h>
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#include <linux/export.h>
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#include <linux/namei.h>
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#include <linux/mount.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/quotaops.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 "recovery.h"
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#include "rgrp.h"
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#include "super.h"
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#include "sys.h"
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#include "util.h"
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#include "log.h"
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#include "quota.h"
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#include "dir.h"
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#include "trace_gfs2.h"
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#define DO 0
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#define UNDO 1
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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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static 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_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_new_files_jdata = 0;
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gt->gt_max_readahead = 1 << 18;
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gt->gt_complain_secs = 10;
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}
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static struct gfs2_sbd *init_sbd(struct super_block *sb)
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{
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struct gfs2_sbd *sdp;
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sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
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if (!sdp)
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return NULL;
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sb->s_fs_info = sdp;
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sdp->sd_vfs = sb;
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set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
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gfs2_tune_init(&sdp->sd_tune);
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init_waitqueue_head(&sdp->sd_glock_wait);
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atomic_set(&sdp->sd_glock_disposal, 0);
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init_completion(&sdp->sd_locking_init);
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spin_lock_init(&sdp->sd_statfs_spin);
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spin_lock_init(&sdp->sd_rindex_spin);
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mutex_init(&sdp->sd_rindex_mutex);
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sdp->sd_rindex_tree.rb_node = NULL;
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INIT_LIST_HEAD(&sdp->sd_jindex_list);
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spin_lock_init(&sdp->sd_jindex_spin);
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mutex_init(&sdp->sd_jindex_mutex);
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INIT_LIST_HEAD(&sdp->sd_quota_list);
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mutex_init(&sdp->sd_quota_mutex);
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init_waitqueue_head(&sdp->sd_quota_wait);
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INIT_LIST_HEAD(&sdp->sd_trunc_list);
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spin_lock_init(&sdp->sd_trunc_lock);
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spin_lock_init(&sdp->sd_log_lock);
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atomic_set(&sdp->sd_log_pinned, 0);
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INIT_LIST_HEAD(&sdp->sd_log_le_buf);
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INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
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INIT_LIST_HEAD(&sdp->sd_log_le_rg);
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INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
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INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
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init_waitqueue_head(&sdp->sd_log_waitq);
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init_waitqueue_head(&sdp->sd_logd_waitq);
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spin_lock_init(&sdp->sd_ail_lock);
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INIT_LIST_HEAD(&sdp->sd_ail1_list);
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INIT_LIST_HEAD(&sdp->sd_ail2_list);
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init_rwsem(&sdp->sd_log_flush_lock);
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atomic_set(&sdp->sd_log_in_flight, 0);
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init_waitqueue_head(&sdp->sd_log_flush_wait);
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INIT_LIST_HEAD(&sdp->sd_revoke_list);
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mutex_init(&sdp->sd_freeze_lock);
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return sdp;
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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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static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
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{
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struct gfs2_sb_host *sb = &sdp->sd_sb;
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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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fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
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return -EINVAL;
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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_sbd *sdp, const void *buf)
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{
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struct gfs2_sb_host *sb = &sdp->sd_sb;
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struct super_block *s = sdp->sd_vfs;
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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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memcpy(s->s_uuid, str->sb_uuid, 16);
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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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static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
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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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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 | REQ_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, p);
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kunmap(page);
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__free_page(page);
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return gfs2_check_sb(sdp, silent);
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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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* @silent: Don't print message if mount fails
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*
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*/
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static int gfs2_read_sb(struct gfs2_sbd *sdp, 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, silent);
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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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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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static int init_names(struct gfs2_sbd *sdp, int silent)
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{
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char *proto, *table;
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int error = 0;
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proto = sdp->sd_args.ar_lockproto;
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table = sdp->sd_args.ar_locktable;
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/* Try to autodetect */
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if (!proto[0] || !table[0]) {
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error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
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if (error)
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return error;
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if (!proto[0])
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proto = sdp->sd_sb.sb_lockproto;
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if (!table[0])
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table = sdp->sd_sb.sb_locktable;
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}
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if (!table[0])
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table = sdp->sd_vfs->s_id;
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strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
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strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
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table = sdp->sd_table_name;
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while ((table = strchr(table, '/')))
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*table = '_';
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return error;
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}
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static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
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int undo)
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{
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int error = 0;
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if (undo)
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goto fail_trans;
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error = gfs2_glock_nq_num(sdp,
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GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
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LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
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mount_gh);
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if (error) {
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fs_err(sdp, "can't acquire mount glock: %d\n", error);
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goto fail;
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}
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error = gfs2_glock_nq_num(sdp,
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GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
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LM_ST_SHARED,
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LM_FLAG_NOEXP | GL_EXACT,
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&sdp->sd_live_gh);
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if (error) {
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fs_err(sdp, "can't acquire live glock: %d\n", error);
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goto fail_mount;
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}
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error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
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CREATE, &sdp->sd_rename_gl);
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if (error) {
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fs_err(sdp, "can't create rename glock: %d\n", error);
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goto fail_live;
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}
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|
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error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
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CREATE, &sdp->sd_trans_gl);
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if (error) {
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fs_err(sdp, "can't create transaction glock: %d\n", error);
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goto fail_rename;
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}
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return 0;
|
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fail_trans:
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gfs2_glock_put(sdp->sd_trans_gl);
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fail_rename:
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gfs2_glock_put(sdp->sd_rename_gl);
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fail_live:
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gfs2_glock_dq_uninit(&sdp->sd_live_gh);
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fail_mount:
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gfs2_glock_dq_uninit(mount_gh);
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fail:
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return error;
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}
|
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|
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static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
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u64 no_addr, const char *name)
|
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{
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struct gfs2_sbd *sdp = sb->s_fs_info;
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struct dentry *dentry;
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struct inode *inode;
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inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
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if (IS_ERR(inode)) {
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fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
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return PTR_ERR(inode);
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}
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dentry = d_alloc_root(inode);
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if (!dentry) {
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fs_err(sdp, "can't alloc %s dentry\n", name);
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iput(inode);
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return -ENOMEM;
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}
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*dptr = dentry;
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return 0;
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}
|
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|
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static int init_sb(struct gfs2_sbd *sdp, int silent)
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{
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struct super_block *sb = sdp->sd_vfs;
|
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struct gfs2_holder sb_gh;
|
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u64 no_addr;
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int ret;
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|
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ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
|
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LM_ST_SHARED, 0, &sb_gh);
|
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if (ret) {
|
|
fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = gfs2_read_sb(sdp, silent);
|
|
if (ret) {
|
|
fs_err(sdp, "can't read superblock: %d\n", ret);
|
|
goto out;
|
|
}
|
|
|
|
/* Set up the buffer cache and SB for real */
|
|
if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
|
|
ret = -EINVAL;
|
|
fs_err(sdp, "FS block size (%u) is too small for device "
|
|
"block size (%u)\n",
|
|
sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
|
|
goto out;
|
|
}
|
|
if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
|
|
ret = -EINVAL;
|
|
fs_err(sdp, "FS block size (%u) is too big for machine "
|
|
"page size (%u)\n",
|
|
sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
|
|
goto out;
|
|
}
|
|
sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
|
|
|
|
/* Get the root inode */
|
|
no_addr = sdp->sd_sb.sb_root_dir.no_addr;
|
|
ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
|
|
if (ret)
|
|
goto out;
|
|
|
|
/* Get the master inode */
|
|
no_addr = sdp->sd_sb.sb_master_dir.no_addr;
|
|
ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
|
|
if (ret) {
|
|
dput(sdp->sd_root_dir);
|
|
goto out;
|
|
}
|
|
sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
|
|
out:
|
|
gfs2_glock_dq_uninit(&sb_gh);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* map_journal_extents - create a reusable "extent" mapping from all logical
|
|
* blocks to all physical blocks for the given journal. This will save
|
|
* us time when writing journal blocks. Most journals will have only one
|
|
* extent that maps all their logical blocks. That's because gfs2.mkfs
|
|
* arranges the journal blocks sequentially to maximize performance.
|
|
* So the extent would map the first block for the entire file length.
|
|
* However, gfs2_jadd can happen while file activity is happening, so
|
|
* those journals may not be sequential. Less likely is the case where
|
|
* the users created their own journals by mounting the metafs and
|
|
* laying it out. But it's still possible. These journals might have
|
|
* several extents.
|
|
*
|
|
* TODO: This should be done in bigger chunks rather than one block at a time,
|
|
* but since it's only done at mount time, I'm not worried about the
|
|
* time it takes.
|
|
*/
|
|
static int map_journal_extents(struct gfs2_sbd *sdp)
|
|
{
|
|
struct gfs2_jdesc *jd = sdp->sd_jdesc;
|
|
unsigned int lb;
|
|
u64 db, prev_db; /* logical block, disk block, prev disk block */
|
|
struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
|
|
struct gfs2_journal_extent *jext = NULL;
|
|
struct buffer_head bh;
|
|
int rc = 0;
|
|
|
|
prev_db = 0;
|
|
|
|
for (lb = 0; lb < i_size_read(jd->jd_inode) >> sdp->sd_sb.sb_bsize_shift; lb++) {
|
|
bh.b_state = 0;
|
|
bh.b_blocknr = 0;
|
|
bh.b_size = 1 << ip->i_inode.i_blkbits;
|
|
rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
|
|
db = bh.b_blocknr;
|
|
if (rc || !db) {
|
|
printk(KERN_INFO "GFS2 journal mapping error %d: lb="
|
|
"%u db=%llu\n", rc, lb, (unsigned long long)db);
|
|
break;
|
|
}
|
|
if (!prev_db || db != prev_db + 1) {
|
|
jext = kzalloc(sizeof(struct gfs2_journal_extent),
|
|
GFP_KERNEL);
|
|
if (!jext) {
|
|
printk(KERN_INFO "GFS2 error: out of memory "
|
|
"mapping journal extents.\n");
|
|
rc = -ENOMEM;
|
|
break;
|
|
}
|
|
jext->dblock = db;
|
|
jext->lblock = lb;
|
|
jext->blocks = 1;
|
|
list_add_tail(&jext->extent_list, &jd->extent_list);
|
|
} else {
|
|
jext->blocks++;
|
|
}
|
|
prev_db = db;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
|
|
{
|
|
char *message = "FIRSTMOUNT=Done";
|
|
char *envp[] = { message, NULL };
|
|
|
|
fs_info(sdp, "first mount done, others may mount\n");
|
|
|
|
if (sdp->sd_lockstruct.ls_ops->lm_first_done)
|
|
sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
|
|
|
|
kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
|
|
}
|
|
|
|
/**
|
|
* gfs2_jindex_hold - Grab a lock on the jindex
|
|
* @sdp: The GFS2 superblock
|
|
* @ji_gh: the holder for the jindex glock
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
|
|
{
|
|
struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
|
|
struct qstr name;
|
|
char buf[20];
|
|
struct gfs2_jdesc *jd;
|
|
int error;
|
|
|
|
name.name = buf;
|
|
|
|
mutex_lock(&sdp->sd_jindex_mutex);
|
|
|
|
for (;;) {
|
|
error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
|
|
if (error)
|
|
break;
|
|
|
|
name.len = sprintf(buf, "journal%u", sdp->sd_journals);
|
|
name.hash = gfs2_disk_hash(name.name, name.len);
|
|
|
|
error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
|
|
if (error == -ENOENT) {
|
|
error = 0;
|
|
break;
|
|
}
|
|
|
|
gfs2_glock_dq_uninit(ji_gh);
|
|
|
|
if (error)
|
|
break;
|
|
|
|
error = -ENOMEM;
|
|
jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
|
|
if (!jd)
|
|
break;
|
|
|
|
INIT_LIST_HEAD(&jd->extent_list);
|
|
INIT_WORK(&jd->jd_work, gfs2_recover_func);
|
|
jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
|
|
if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
|
|
if (!jd->jd_inode)
|
|
error = -ENOENT;
|
|
else
|
|
error = PTR_ERR(jd->jd_inode);
|
|
kfree(jd);
|
|
break;
|
|
}
|
|
|
|
spin_lock(&sdp->sd_jindex_spin);
|
|
jd->jd_jid = sdp->sd_journals++;
|
|
list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
|
|
spin_unlock(&sdp->sd_jindex_spin);
|
|
}
|
|
|
|
mutex_unlock(&sdp->sd_jindex_mutex);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int init_journal(struct gfs2_sbd *sdp, int undo)
|
|
{
|
|
struct inode *master = sdp->sd_master_dir->d_inode;
|
|
struct gfs2_holder ji_gh;
|
|
struct gfs2_inode *ip;
|
|
int jindex = 1;
|
|
int error = 0;
|
|
|
|
if (undo) {
|
|
jindex = 0;
|
|
goto fail_jinode_gh;
|
|
}
|
|
|
|
sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
|
|
if (IS_ERR(sdp->sd_jindex)) {
|
|
fs_err(sdp, "can't lookup journal index: %d\n", error);
|
|
return PTR_ERR(sdp->sd_jindex);
|
|
}
|
|
|
|
/* Load in the journal index special file */
|
|
|
|
error = gfs2_jindex_hold(sdp, &ji_gh);
|
|
if (error) {
|
|
fs_err(sdp, "can't read journal index: %d\n", error);
|
|
goto fail;
|
|
}
|
|
|
|
error = -EUSERS;
|
|
if (!gfs2_jindex_size(sdp)) {
|
|
fs_err(sdp, "no journals!\n");
|
|
goto fail_jindex;
|
|
}
|
|
|
|
if (sdp->sd_args.ar_spectator) {
|
|
sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
|
|
atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
|
|
atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
|
|
atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
|
|
} else {
|
|
if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
|
|
fs_err(sdp, "can't mount journal #%u\n",
|
|
sdp->sd_lockstruct.ls_jid);
|
|
fs_err(sdp, "there are only %u journals (0 - %u)\n",
|
|
gfs2_jindex_size(sdp),
|
|
gfs2_jindex_size(sdp) - 1);
|
|
goto fail_jindex;
|
|
}
|
|
sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
|
|
|
|
error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
|
|
&gfs2_journal_glops,
|
|
LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
|
|
&sdp->sd_journal_gh);
|
|
if (error) {
|
|
fs_err(sdp, "can't acquire journal glock: %d\n", error);
|
|
goto fail_jindex;
|
|
}
|
|
|
|
ip = GFS2_I(sdp->sd_jdesc->jd_inode);
|
|
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
|
|
LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
|
|
&sdp->sd_jinode_gh);
|
|
if (error) {
|
|
fs_err(sdp, "can't acquire journal inode glock: %d\n",
|
|
error);
|
|
goto fail_journal_gh;
|
|
}
|
|
|
|
error = gfs2_jdesc_check(sdp->sd_jdesc);
|
|
if (error) {
|
|
fs_err(sdp, "my journal (%u) is bad: %d\n",
|
|
sdp->sd_jdesc->jd_jid, error);
|
|
goto fail_jinode_gh;
|
|
}
|
|
atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
|
|
atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
|
|
atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
|
|
|
|
/* Map the extents for this journal's blocks */
|
|
map_journal_extents(sdp);
|
|
}
|
|
trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
|
|
|
|
if (sdp->sd_lockstruct.ls_first) {
|
|
unsigned int x;
|
|
for (x = 0; x < sdp->sd_journals; x++) {
|
|
error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x),
|
|
true);
|
|
if (error) {
|
|
fs_err(sdp, "error recovering journal %u: %d\n",
|
|
x, error);
|
|
goto fail_jinode_gh;
|
|
}
|
|
}
|
|
|
|
gfs2_others_may_mount(sdp);
|
|
} else if (!sdp->sd_args.ar_spectator) {
|
|
error = gfs2_recover_journal(sdp->sd_jdesc, true);
|
|
if (error) {
|
|
fs_err(sdp, "error recovering my journal: %d\n", error);
|
|
goto fail_jinode_gh;
|
|
}
|
|
}
|
|
|
|
set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
|
|
gfs2_glock_dq_uninit(&ji_gh);
|
|
jindex = 0;
|
|
|
|
return 0;
|
|
|
|
fail_jinode_gh:
|
|
if (!sdp->sd_args.ar_spectator)
|
|
gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
|
|
fail_journal_gh:
|
|
if (!sdp->sd_args.ar_spectator)
|
|
gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
|
|
fail_jindex:
|
|
gfs2_jindex_free(sdp);
|
|
if (jindex)
|
|
gfs2_glock_dq_uninit(&ji_gh);
|
|
fail:
|
|
iput(sdp->sd_jindex);
|
|
return error;
|
|
}
|
|
|
|
|
|
static int init_inodes(struct gfs2_sbd *sdp, int undo)
|
|
{
|
|
int error = 0;
|
|
struct inode *master = sdp->sd_master_dir->d_inode;
|
|
|
|
if (undo)
|
|
goto fail_qinode;
|
|
|
|
error = init_journal(sdp, undo);
|
|
if (error)
|
|
goto fail;
|
|
|
|
/* Read in the master statfs inode */
|
|
sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
|
|
if (IS_ERR(sdp->sd_statfs_inode)) {
|
|
error = PTR_ERR(sdp->sd_statfs_inode);
|
|
fs_err(sdp, "can't read in statfs inode: %d\n", error);
|
|
goto fail_journal;
|
|
}
|
|
|
|
/* Read in the resource index inode */
|
|
sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
|
|
if (IS_ERR(sdp->sd_rindex)) {
|
|
error = PTR_ERR(sdp->sd_rindex);
|
|
fs_err(sdp, "can't get resource index inode: %d\n", error);
|
|
goto fail_statfs;
|
|
}
|
|
sdp->sd_rindex_uptodate = 0;
|
|
|
|
/* Read in the quota inode */
|
|
sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
|
|
if (IS_ERR(sdp->sd_quota_inode)) {
|
|
error = PTR_ERR(sdp->sd_quota_inode);
|
|
fs_err(sdp, "can't get quota file inode: %d\n", error);
|
|
goto fail_rindex;
|
|
}
|
|
|
|
error = gfs2_rindex_update(sdp);
|
|
if (error)
|
|
goto fail_qinode;
|
|
|
|
return 0;
|
|
|
|
fail_qinode:
|
|
iput(sdp->sd_quota_inode);
|
|
fail_rindex:
|
|
gfs2_clear_rgrpd(sdp);
|
|
iput(sdp->sd_rindex);
|
|
fail_statfs:
|
|
iput(sdp->sd_statfs_inode);
|
|
fail_journal:
|
|
init_journal(sdp, UNDO);
|
|
fail:
|
|
return error;
|
|
}
|
|
|
|
static int init_per_node(struct gfs2_sbd *sdp, int undo)
|
|
{
|
|
struct inode *pn = NULL;
|
|
char buf[30];
|
|
int error = 0;
|
|
struct gfs2_inode *ip;
|
|
struct inode *master = sdp->sd_master_dir->d_inode;
|
|
|
|
if (sdp->sd_args.ar_spectator)
|
|
return 0;
|
|
|
|
if (undo)
|
|
goto fail_qc_gh;
|
|
|
|
pn = gfs2_lookup_simple(master, "per_node");
|
|
if (IS_ERR(pn)) {
|
|
error = PTR_ERR(pn);
|
|
fs_err(sdp, "can't find per_node directory: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
|
|
sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
|
|
if (IS_ERR(sdp->sd_sc_inode)) {
|
|
error = PTR_ERR(sdp->sd_sc_inode);
|
|
fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
|
|
goto fail;
|
|
}
|
|
|
|
sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
|
|
sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
|
|
if (IS_ERR(sdp->sd_qc_inode)) {
|
|
error = PTR_ERR(sdp->sd_qc_inode);
|
|
fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
|
|
goto fail_ut_i;
|
|
}
|
|
|
|
iput(pn);
|
|
pn = NULL;
|
|
|
|
ip = GFS2_I(sdp->sd_sc_inode);
|
|
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
|
|
&sdp->sd_sc_gh);
|
|
if (error) {
|
|
fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
|
|
goto fail_qc_i;
|
|
}
|
|
|
|
ip = GFS2_I(sdp->sd_qc_inode);
|
|
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
|
|
&sdp->sd_qc_gh);
|
|
if (error) {
|
|
fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
|
|
goto fail_ut_gh;
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail_qc_gh:
|
|
gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
|
|
fail_ut_gh:
|
|
gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
|
|
fail_qc_i:
|
|
iput(sdp->sd_qc_inode);
|
|
fail_ut_i:
|
|
iput(sdp->sd_sc_inode);
|
|
fail:
|
|
if (pn)
|
|
iput(pn);
|
|
return error;
|
|
}
|
|
|
|
static int init_threads(struct gfs2_sbd *sdp, int undo)
|
|
{
|
|
struct task_struct *p;
|
|
int error = 0;
|
|
|
|
if (undo)
|
|
goto fail_quotad;
|
|
|
|
p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
|
|
error = IS_ERR(p);
|
|
if (error) {
|
|
fs_err(sdp, "can't start logd thread: %d\n", error);
|
|
return error;
|
|
}
|
|
sdp->sd_logd_process = p;
|
|
|
|
p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
|
|
error = IS_ERR(p);
|
|
if (error) {
|
|
fs_err(sdp, "can't start quotad thread: %d\n", error);
|
|
goto fail;
|
|
}
|
|
sdp->sd_quotad_process = p;
|
|
|
|
return 0;
|
|
|
|
|
|
fail_quotad:
|
|
kthread_stop(sdp->sd_quotad_process);
|
|
fail:
|
|
kthread_stop(sdp->sd_logd_process);
|
|
return error;
|
|
}
|
|
|
|
static const match_table_t nolock_tokens = {
|
|
{ Opt_jid, "jid=%d\n", },
|
|
{ Opt_err, NULL },
|
|
};
|
|
|
|
static const struct lm_lockops nolock_ops = {
|
|
.lm_proto_name = "lock_nolock",
|
|
.lm_put_lock = gfs2_glock_free,
|
|
.lm_tokens = &nolock_tokens,
|
|
};
|
|
|
|
/**
|
|
* gfs2_lm_mount - mount a locking protocol
|
|
* @sdp: the filesystem
|
|
* @args: mount arguments
|
|
* @silent: if 1, don't complain if the FS isn't a GFS2 fs
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
|
|
{
|
|
const struct lm_lockops *lm;
|
|
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
|
|
struct gfs2_args *args = &sdp->sd_args;
|
|
const char *proto = sdp->sd_proto_name;
|
|
const char *table = sdp->sd_table_name;
|
|
char *o, *options;
|
|
int ret;
|
|
|
|
if (!strcmp("lock_nolock", proto)) {
|
|
lm = &nolock_ops;
|
|
sdp->sd_args.ar_localflocks = 1;
|
|
#ifdef CONFIG_GFS2_FS_LOCKING_DLM
|
|
} else if (!strcmp("lock_dlm", proto)) {
|
|
lm = &gfs2_dlm_ops;
|
|
#endif
|
|
} else {
|
|
printk(KERN_INFO "GFS2: can't find protocol %s\n", proto);
|
|
return -ENOENT;
|
|
}
|
|
|
|
fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
|
|
|
|
ls->ls_ops = lm;
|
|
ls->ls_first = 1;
|
|
|
|
for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
|
|
substring_t tmp[MAX_OPT_ARGS];
|
|
int token, option;
|
|
|
|
if (!o || !*o)
|
|
continue;
|
|
|
|
token = match_token(o, *lm->lm_tokens, tmp);
|
|
switch (token) {
|
|
case Opt_jid:
|
|
ret = match_int(&tmp[0], &option);
|
|
if (ret || option < 0)
|
|
goto hostdata_error;
|
|
if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
|
|
ls->ls_jid = option;
|
|
break;
|
|
case Opt_id:
|
|
/* Obsolete, but left for backward compat purposes */
|
|
break;
|
|
case Opt_first:
|
|
ret = match_int(&tmp[0], &option);
|
|
if (ret || (option != 0 && option != 1))
|
|
goto hostdata_error;
|
|
ls->ls_first = option;
|
|
break;
|
|
case Opt_nodir:
|
|
ret = match_int(&tmp[0], &option);
|
|
if (ret || (option != 0 && option != 1))
|
|
goto hostdata_error;
|
|
ls->ls_nodir = option;
|
|
break;
|
|
case Opt_err:
|
|
default:
|
|
hostdata_error:
|
|
fs_info(sdp, "unknown hostdata (%s)\n", o);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
if (lm->lm_mount == NULL) {
|
|
fs_info(sdp, "Now mounting FS...\n");
|
|
complete_all(&sdp->sd_locking_init);
|
|
return 0;
|
|
}
|
|
ret = lm->lm_mount(sdp, table);
|
|
if (ret == 0)
|
|
fs_info(sdp, "Joined cluster. Now mounting FS...\n");
|
|
complete_all(&sdp->sd_locking_init);
|
|
return ret;
|
|
}
|
|
|
|
void gfs2_lm_unmount(struct gfs2_sbd *sdp)
|
|
{
|
|
const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
|
|
if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) &&
|
|
lm->lm_unmount)
|
|
lm->lm_unmount(sdp);
|
|
}
|
|
|
|
static int gfs2_journalid_wait(void *word)
|
|
{
|
|
if (signal_pending(current))
|
|
return -EINTR;
|
|
schedule();
|
|
return 0;
|
|
}
|
|
|
|
static int wait_on_journal(struct gfs2_sbd *sdp)
|
|
{
|
|
if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
|
|
return 0;
|
|
|
|
return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, gfs2_journalid_wait, TASK_INTERRUPTIBLE);
|
|
}
|
|
|
|
void gfs2_online_uevent(struct gfs2_sbd *sdp)
|
|
{
|
|
struct super_block *sb = sdp->sd_vfs;
|
|
char ro[20];
|
|
char spectator[20];
|
|
char *envp[] = { ro, spectator, NULL };
|
|
sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
|
|
sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
|
|
kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
|
|
}
|
|
|
|
/**
|
|
* fill_super - Read in superblock
|
|
* @sb: The VFS superblock
|
|
* @data: Mount options
|
|
* @silent: Don't complain if it's not a GFS2 filesystem
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent)
|
|
{
|
|
struct gfs2_sbd *sdp;
|
|
struct gfs2_holder mount_gh;
|
|
int error;
|
|
|
|
sdp = init_sbd(sb);
|
|
if (!sdp) {
|
|
printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
|
|
return -ENOMEM;
|
|
}
|
|
sdp->sd_args = *args;
|
|
|
|
if (sdp->sd_args.ar_spectator) {
|
|
sb->s_flags |= MS_RDONLY;
|
|
set_bit(SDF_RORECOVERY, &sdp->sd_flags);
|
|
}
|
|
if (sdp->sd_args.ar_posix_acl)
|
|
sb->s_flags |= MS_POSIXACL;
|
|
if (sdp->sd_args.ar_nobarrier)
|
|
set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
|
|
|
|
sb->s_flags |= MS_NOSEC;
|
|
sb->s_magic = GFS2_MAGIC;
|
|
sb->s_op = &gfs2_super_ops;
|
|
sb->s_d_op = &gfs2_dops;
|
|
sb->s_export_op = &gfs2_export_ops;
|
|
sb->s_xattr = gfs2_xattr_handlers;
|
|
sb->s_qcop = &gfs2_quotactl_ops;
|
|
sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
|
|
sb->s_time_gran = 1;
|
|
sb->s_maxbytes = MAX_LFS_FILESIZE;
|
|
|
|
/* Set up the buffer cache and fill in some fake block size values
|
|
to allow us to read-in the on-disk superblock. */
|
|
sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
|
|
sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
|
|
sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
|
|
GFS2_BASIC_BLOCK_SHIFT;
|
|
sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
|
|
|
|
sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
|
|
sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
|
|
if (sdp->sd_args.ar_statfs_quantum) {
|
|
sdp->sd_tune.gt_statfs_slow = 0;
|
|
sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
|
|
} else {
|
|
sdp->sd_tune.gt_statfs_slow = 1;
|
|
sdp->sd_tune.gt_statfs_quantum = 30;
|
|
}
|
|
|
|
error = init_names(sdp, silent);
|
|
if (error)
|
|
goto fail;
|
|
|
|
snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s", sdp->sd_table_name);
|
|
|
|
gfs2_create_debugfs_file(sdp);
|
|
|
|
error = gfs2_sys_fs_add(sdp);
|
|
if (error)
|
|
goto fail;
|
|
|
|
error = gfs2_lm_mount(sdp, silent);
|
|
if (error)
|
|
goto fail_sys;
|
|
|
|
error = init_locking(sdp, &mount_gh, DO);
|
|
if (error)
|
|
goto fail_lm;
|
|
|
|
error = init_sb(sdp, silent);
|
|
if (error)
|
|
goto fail_locking;
|
|
|
|
error = wait_on_journal(sdp);
|
|
if (error)
|
|
goto fail_sb;
|
|
|
|
/*
|
|
* If user space has failed to join the cluster or some similar
|
|
* failure has occurred, then the journal id will contain a
|
|
* negative (error) number. This will then be returned to the
|
|
* caller (of the mount syscall). We do this even for spectator
|
|
* mounts (which just write a jid of 0 to indicate "ok" even though
|
|
* the jid is unused in the spectator case)
|
|
*/
|
|
if (sdp->sd_lockstruct.ls_jid < 0) {
|
|
error = sdp->sd_lockstruct.ls_jid;
|
|
sdp->sd_lockstruct.ls_jid = 0;
|
|
goto fail_sb;
|
|
}
|
|
|
|
if (sdp->sd_args.ar_spectator)
|
|
snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s",
|
|
sdp->sd_table_name);
|
|
else
|
|
snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u",
|
|
sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
|
|
|
|
error = init_inodes(sdp, DO);
|
|
if (error)
|
|
goto fail_sb;
|
|
|
|
error = init_per_node(sdp, DO);
|
|
if (error)
|
|
goto fail_inodes;
|
|
|
|
error = gfs2_statfs_init(sdp);
|
|
if (error) {
|
|
fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
|
|
goto fail_per_node;
|
|
}
|
|
|
|
error = init_threads(sdp, DO);
|
|
if (error)
|
|
goto fail_per_node;
|
|
|
|
if (!(sb->s_flags & MS_RDONLY)) {
|
|
error = gfs2_make_fs_rw(sdp);
|
|
if (error) {
|
|
fs_err(sdp, "can't make FS RW: %d\n", error);
|
|
goto fail_threads;
|
|
}
|
|
}
|
|
|
|
gfs2_glock_dq_uninit(&mount_gh);
|
|
gfs2_online_uevent(sdp);
|
|
return 0;
|
|
|
|
fail_threads:
|
|
init_threads(sdp, UNDO);
|
|
fail_per_node:
|
|
init_per_node(sdp, UNDO);
|
|
fail_inodes:
|
|
init_inodes(sdp, UNDO);
|
|
fail_sb:
|
|
if (sdp->sd_root_dir)
|
|
dput(sdp->sd_root_dir);
|
|
if (sdp->sd_master_dir)
|
|
dput(sdp->sd_master_dir);
|
|
if (sb->s_root)
|
|
dput(sb->s_root);
|
|
sb->s_root = NULL;
|
|
fail_locking:
|
|
init_locking(sdp, &mount_gh, UNDO);
|
|
fail_lm:
|
|
gfs2_gl_hash_clear(sdp);
|
|
gfs2_lm_unmount(sdp);
|
|
fail_sys:
|
|
gfs2_sys_fs_del(sdp);
|
|
fail:
|
|
gfs2_delete_debugfs_file(sdp);
|
|
kfree(sdp);
|
|
sb->s_fs_info = NULL;
|
|
return error;
|
|
}
|
|
|
|
static int set_gfs2_super(struct super_block *s, void *data)
|
|
{
|
|
s->s_bdev = data;
|
|
s->s_dev = s->s_bdev->bd_dev;
|
|
|
|
/*
|
|
* We set the bdi here to the queue backing, file systems can
|
|
* overwrite this in ->fill_super()
|
|
*/
|
|
s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info;
|
|
return 0;
|
|
}
|
|
|
|
static int test_gfs2_super(struct super_block *s, void *ptr)
|
|
{
|
|
struct block_device *bdev = ptr;
|
|
return (bdev == s->s_bdev);
|
|
}
|
|
|
|
/**
|
|
* gfs2_mount - Get the GFS2 superblock
|
|
* @fs_type: The GFS2 filesystem type
|
|
* @flags: Mount flags
|
|
* @dev_name: The name of the device
|
|
* @data: The mount arguments
|
|
*
|
|
* Q. Why not use get_sb_bdev() ?
|
|
* A. We need to select one of two root directories to mount, independent
|
|
* of whether this is the initial, or subsequent, mount of this sb
|
|
*
|
|
* Returns: 0 or -ve on error
|
|
*/
|
|
|
|
static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags,
|
|
const char *dev_name, void *data)
|
|
{
|
|
struct block_device *bdev;
|
|
struct super_block *s;
|
|
fmode_t mode = FMODE_READ | FMODE_EXCL;
|
|
int error;
|
|
struct gfs2_args args;
|
|
struct gfs2_sbd *sdp;
|
|
|
|
if (!(flags & MS_RDONLY))
|
|
mode |= FMODE_WRITE;
|
|
|
|
bdev = blkdev_get_by_path(dev_name, mode, fs_type);
|
|
if (IS_ERR(bdev))
|
|
return ERR_CAST(bdev);
|
|
|
|
/*
|
|
* once the super is inserted into the list by sget, s_umount
|
|
* will protect the lockfs code from trying to start a snapshot
|
|
* while we are mounting
|
|
*/
|
|
mutex_lock(&bdev->bd_fsfreeze_mutex);
|
|
if (bdev->bd_fsfreeze_count > 0) {
|
|
mutex_unlock(&bdev->bd_fsfreeze_mutex);
|
|
error = -EBUSY;
|
|
goto error_bdev;
|
|
}
|
|
s = sget(fs_type, test_gfs2_super, set_gfs2_super, bdev);
|
|
mutex_unlock(&bdev->bd_fsfreeze_mutex);
|
|
error = PTR_ERR(s);
|
|
if (IS_ERR(s))
|
|
goto error_bdev;
|
|
|
|
if (s->s_root)
|
|
blkdev_put(bdev, mode);
|
|
|
|
memset(&args, 0, sizeof(args));
|
|
args.ar_quota = GFS2_QUOTA_DEFAULT;
|
|
args.ar_data = GFS2_DATA_DEFAULT;
|
|
args.ar_commit = 30;
|
|
args.ar_statfs_quantum = 30;
|
|
args.ar_quota_quantum = 60;
|
|
args.ar_errors = GFS2_ERRORS_DEFAULT;
|
|
|
|
error = gfs2_mount_args(&args, data);
|
|
if (error) {
|
|
printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
|
|
goto error_super;
|
|
}
|
|
|
|
if (s->s_root) {
|
|
error = -EBUSY;
|
|
if ((flags ^ s->s_flags) & MS_RDONLY)
|
|
goto error_super;
|
|
} else {
|
|
char b[BDEVNAME_SIZE];
|
|
|
|
s->s_flags = flags;
|
|
s->s_mode = mode;
|
|
strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
|
|
sb_set_blocksize(s, block_size(bdev));
|
|
error = fill_super(s, &args, flags & MS_SILENT ? 1 : 0);
|
|
if (error)
|
|
goto error_super;
|
|
s->s_flags |= MS_ACTIVE;
|
|
bdev->bd_super = s;
|
|
}
|
|
|
|
sdp = s->s_fs_info;
|
|
if (args.ar_meta)
|
|
return dget(sdp->sd_master_dir);
|
|
else
|
|
return dget(sdp->sd_root_dir);
|
|
|
|
error_super:
|
|
deactivate_locked_super(s);
|
|
return ERR_PTR(error);
|
|
error_bdev:
|
|
blkdev_put(bdev, mode);
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
static int set_meta_super(struct super_block *s, void *ptr)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static struct dentry *gfs2_mount_meta(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
struct super_block *s;
|
|
struct gfs2_sbd *sdp;
|
|
struct path path;
|
|
int error;
|
|
|
|
error = kern_path(dev_name, LOOKUP_FOLLOW, &path);
|
|
if (error) {
|
|
printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
|
|
dev_name, error);
|
|
return ERR_PTR(error);
|
|
}
|
|
s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super,
|
|
path.dentry->d_inode->i_sb->s_bdev);
|
|
path_put(&path);
|
|
if (IS_ERR(s)) {
|
|
printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
|
|
return ERR_CAST(s);
|
|
}
|
|
if ((flags ^ s->s_flags) & MS_RDONLY) {
|
|
deactivate_locked_super(s);
|
|
return ERR_PTR(-EBUSY);
|
|
}
|
|
sdp = s->s_fs_info;
|
|
return dget(sdp->sd_master_dir);
|
|
}
|
|
|
|
static void gfs2_kill_sb(struct super_block *sb)
|
|
{
|
|
struct gfs2_sbd *sdp = sb->s_fs_info;
|
|
|
|
if (sdp == NULL) {
|
|
kill_block_super(sb);
|
|
return;
|
|
}
|
|
|
|
gfs2_meta_syncfs(sdp);
|
|
dput(sdp->sd_root_dir);
|
|
dput(sdp->sd_master_dir);
|
|
sdp->sd_root_dir = NULL;
|
|
sdp->sd_master_dir = NULL;
|
|
shrink_dcache_sb(sb);
|
|
kill_block_super(sb);
|
|
gfs2_delete_debugfs_file(sdp);
|
|
kfree(sdp);
|
|
}
|
|
|
|
struct file_system_type gfs2_fs_type = {
|
|
.name = "gfs2",
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
.mount = gfs2_mount,
|
|
.kill_sb = gfs2_kill_sb,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
struct file_system_type gfs2meta_fs_type = {
|
|
.name = "gfs2meta",
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
.mount = gfs2_mount_meta,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|