Release 4.10 fs/gfs2/ops_fstype.c

/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License version 2.
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/blkdev.h>
#include <linux/kthread.h>
#include <linux/export.h>
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/gfs2_ondisk.h>
#include <linux/quotaops.h>
#include <linux/lockdep.h>
#include <linux/module.h>

#include "gfs2.h"
#include "incore.h"
#include "bmap.h"
#include "glock.h"
#include "glops.h"
#include "inode.h"
#include "recovery.h"
#include "rgrp.h"
#include "super.h"
#include "sys.h"
#include "util.h"
#include "log.h"
#include "quota.h"
#include "dir.h"
#include "meta_io.h"
#include "trace_gfs2.h"


#define DO 0

#define UNDO 1

/**
 * gfs2_tune_init - Fill a gfs2_tune structure with default values
 * @gt: tune
 *
 */



static void gfs2_tune_init(struct gfs2_tune *gt)
{
	spin_lock_init(&gt->gt_spin);

	gt->gt_quota_warn_period = 10;
	gt->gt_quota_scale_num = 1;
	gt->gt_quota_scale_den = 1;
	gt->gt_new_files_jdata = 0;
	gt->gt_max_readahead = BIT(18);
	gt->gt_complain_secs = 10;
}

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static struct gfs2_sbd *init_sbd(struct super_block *sb)
{
	struct gfs2_sbd *sdp;
	struct address_space *mapping;

	sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
	if (!sdp)
		return NULL;

	sb->s_fs_info = sdp;
	sdp->sd_vfs = sb;
	sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats);
	if (!sdp->sd_lkstats) {
		kfree(sdp);
		return NULL;
	}

	set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
	gfs2_tune_init(&sdp->sd_tune);

	init_waitqueue_head(&sdp->sd_glock_wait);
	atomic_set(&sdp->sd_glock_disposal, 0);
	init_completion(&sdp->sd_locking_init);
	init_completion(&sdp->sd_wdack);
	spin_lock_init(&sdp->sd_statfs_spin);

	spin_lock_init(&sdp->sd_rindex_spin);
	sdp->sd_rindex_tree.rb_node = NULL;

	INIT_LIST_HEAD(&sdp->sd_jindex_list);
	spin_lock_init(&sdp->sd_jindex_spin);
	mutex_init(&sdp->sd_jindex_mutex);
	init_completion(&sdp->sd_journal_ready);

	INIT_LIST_HEAD(&sdp->sd_quota_list);
	mutex_init(&sdp->sd_quota_mutex);
	mutex_init(&sdp->sd_quota_sync_mutex);
	init_waitqueue_head(&sdp->sd_quota_wait);
	INIT_LIST_HEAD(&sdp->sd_trunc_list);
	spin_lock_init(&sdp->sd_trunc_lock);
	spin_lock_init(&sdp->sd_bitmap_lock);

	mapping = &sdp->sd_aspace;

	address_space_init_once(mapping);
	mapping->a_ops = &gfs2_rgrp_aops;
	mapping->host = sb->s_bdev->bd_inode;
	mapping->flags = 0;
	mapping_set_gfp_mask(mapping, GFP_NOFS);
	mapping->private_data = NULL;
	mapping->writeback_index = 0;

	spin_lock_init(&sdp->sd_log_lock);
	atomic_set(&sdp->sd_log_pinned, 0);
	INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
	INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
	spin_lock_init(&sdp->sd_ordered_lock);

	init_waitqueue_head(&sdp->sd_log_waitq);
	init_waitqueue_head(&sdp->sd_logd_waitq);
	spin_lock_init(&sdp->sd_ail_lock);
	INIT_LIST_HEAD(&sdp->sd_ail1_list);
	INIT_LIST_HEAD(&sdp->sd_ail2_list);

	init_rwsem(&sdp->sd_log_flush_lock);
	atomic_set(&sdp->sd_log_in_flight, 0);
	atomic_set(&sdp->sd_reserving_log, 0);
	init_waitqueue_head(&sdp->sd_reserving_log_wait);
	init_waitqueue_head(&sdp->sd_log_flush_wait);
	atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
	mutex_init(&sdp->sd_freeze_mutex);

	return sdp;
}


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robert s. peterson
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dave chinner
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/**
 * gfs2_check_sb - Check superblock
 * @sdp: the filesystem
 * @sb: The superblock
 * @silent: Don't print a message if the check fails
 *
 * Checks the version code of the FS is one that we understand how to
 * read and that the sizes of the various on-disk structures have not
 * changed.
 */



static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
{
	struct gfs2_sb_host *sb = &sdp->sd_sb;

	if (sb->sb_magic != GFS2_MAGIC ||
	    sb->sb_type != GFS2_METATYPE_SB) {
		if (!silent)
			pr_warn("not a GFS2 filesystem\n");
		return -EINVAL;
	}

	/*  If format numbers match exactly, we're done.  */

	if (sb->sb_fs_format == GFS2_FORMAT_FS &&
	    sb->sb_multihost_format == GFS2_FORMAT_MULTI)
		return 0;

	fs_warn(sdp, "Unknown on-disk format, unable to mount\n");

	return -EINVAL;
}

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31.33%
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joe perches
1
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16.67%
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83
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6
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static void end_bio_io_page(struct bio *bio)
{
	struct page *page = bio->bi_private;

	if (!bio->bi_error)
		SetPageUptodate(page);
	else
		pr_warn("error %d reading superblock\n", bio->bi_error);
	unlock_page(page);
}

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joe perches
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2.13%
1
25.00%
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2.13%
1
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4
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static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
{
	struct gfs2_sb_host *sb = &sdp->sd_sb;
	struct super_block *s = sdp->sd_vfs;
	const struct gfs2_sb *str = buf;

	sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
	sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
	sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
	sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
	sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
	sb->sb_bsize = be32_to_cpu(str->sb_bsize);
	sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
	sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
	sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
	sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
	sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);

	memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
	memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
	memcpy(s->s_uuid, str->sb_uuid, 16);
}

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/**
 * gfs2_read_super - Read the gfs2 super block from disk
 * @sdp: The GFS2 super block
 * @sector: The location of the super block
 * @error: The error code to return
 *
 * This uses the bio functions to read the super block from disk
 * because we want to be 100% sure that we never read cached data.
 * A super block is read twice only during each GFS2 mount and is
 * never written to by the filesystem. The first time its read no
 * locks are held, and the only details which are looked at are those
 * relating to the locking protocol. Once locking is up and working,
 * the sb is read again under the lock to establish the location of
 * the master directory (contains pointers to journals etc) and the
 * root directory.
 *
 * Returns: 0 on success or error
 */



static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
{
	struct super_block *sb = sdp->sd_vfs;
	struct gfs2_sb *p;
	struct page *page;
	struct bio *bio;

	page = alloc_page(GFP_NOFS);
	if (unlikely(!page))
		return -ENOMEM;

	ClearPageUptodate(page);
	ClearPageDirty(page);
	lock_page(page);

	bio = bio_alloc(GFP_NOFS, 1);
	bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
	bio->bi_bdev = sb->s_bdev;
	bio_add_page(bio, page, PAGE_SIZE, 0);

	bio->bi_end_io = end_bio_io_page;
	bio->bi_private = page;
	bio_set_op_attrs(bio, REQ_OP_READ, REQ_META);
	submit_bio(bio);
	wait_on_page_locked(page);
	bio_put(bio);
	if (!PageUptodate(page)) {
		__free_page(page);
		return -EIO;
	}
	p = kmap(page);
	gfs2_sb_in(sdp, p);
	kunmap(page);
	__free_page(page);
	return gfs2_check_sb(sdp, silent);
}

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kent overstreet
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/**
 * gfs2_read_sb - Read super block
 * @sdp: The GFS2 superblock
 * @silent: Don't print message if mount fails
 *
 */



static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
{
	u32 hash_blocks, ind_blocks, leaf_blocks;
	u32 tmp_blocks;
	unsigned int x;
	int error;

	error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
	if (error) {
		if (!silent)
			fs_err(sdp, "can't read superblock\n");
		return error;
	}

	sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
			       GFS2_BASIC_BLOCK_SHIFT;
	sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
	sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
			  sizeof(struct gfs2_dinode)) / sizeof(u64);
	sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
			  sizeof(struct gfs2_meta_header)) / sizeof(u64);
	sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
	sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
	sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
	sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
	sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
				sizeof(struct gfs2_meta_header)) /
			        sizeof(struct gfs2_quota_change);
	sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
				     sizeof(struct gfs2_meta_header))
		* GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */

	/* Compute maximum reservation required to add a entry to a directory */

	hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH),
			     sdp->sd_jbsize);

	ind_blocks = 0;
	for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
		tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
		ind_blocks += tmp_blocks;
	}

	leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;

	sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;

	sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
				sizeof(struct gfs2_dinode);
	sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
	for (x = 2;; x++) {
		u64 space, d;
		u32 m;

		space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
		d = space;
		m = do_div(d, sdp->sd_inptrs);

		if (d != sdp->sd_heightsize[x - 1] || m)
			break;
		sdp->sd_heightsize[x] = space;
	}
	sdp->sd_max_height = x;
	sdp->sd_heightsize[x] = ~0;
	gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);

	sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
				 sizeof(struct gfs2_dinode);
	sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
	for (x = 2;; x++) {
		u64 space, d;
		u32 m;

		space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
		d = space;
		m = do_div(d, sdp->sd_inptrs);

		if (d != sdp->sd_jheightsize[x - 1] || m)
			break;
		sdp->sd_jheightsize[x] = space;
	}
	sdp->sd_max_jheight = x;
	sdp->sd_jheightsize[x] = ~0;
	gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);

	sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
				      sizeof(struct gfs2_leaf)) /
				     GFS2_MIN_DIRENT_SIZE;
	return 0;
}

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1
20.00%
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benjamin marzinski
20
3.33%
1
20.00%
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fabian frederick
6
1.00%
1
20.00%
Total
601
100.00%
5
100.00%



static int init_names(struct gfs2_sbd *sdp, int silent)
{
	char *proto, *table;
	int error = 0;

	proto = sdp->sd_args.ar_lockproto;
	table = sdp->sd_args.ar_locktable;

	/*  Try to autodetect  */

	if (!proto[0] || !table[0]) {
		error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
		if (error)
			return error;

		if (!proto[0])
			proto = sdp->sd_sb.sb_lockproto;
		if (!table[0])
			table = sdp->sd_sb.sb_locktable;
	}

	if (!table[0])
		table = sdp->sd_vfs->s_id;

	strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
	strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);

	table = sdp->sd_table_name;
	while ((table = strchr(table, '/')))
		*table = '_';

	return error;
}

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1
16.67%
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robert s. peterson
17
9.55%
1
16.67%
cheng renquan
cheng renquan
7
3.93%
1
16.67%
jean delvare
jean delvare
6
3.37%
1
16.67%
Total
178
100.00%
6
100.00%



static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
			int undo)
{
	int error = 0;

	if (undo)
		goto fail_trans;

	error = gfs2_glock_nq_num(sdp,
				  GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
				  LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
				  mount_gh);
	if (error) {
		fs_err(sdp, "can't acquire mount glock: %d\n", error);
		goto fail;
	}

	error = gfs2_glock_nq_num(sdp,
				  GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
				  LM_ST_SHARED,
				  LM_FLAG_NOEXP | GL_EXACT,
				  &sdp->sd_live_gh);
	if (error) {
		fs_err(sdp, "can't acquire live glock: %d\n", error);
		goto fail_mount;
	}

	error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
			       CREATE, &sdp->sd_rename_gl);
	if (error) {
		fs_err(sdp, "can't create rename glock: %d\n", error);
		goto fail_live;
	}

	error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops,
			       CREATE, &sdp->sd_freeze_gl);
	if (error) {
		fs_err(sdp, "can't create transaction glock: %d\n", error);
		goto fail_rename;
	}

	return 0;

fail_trans:
	gfs2_glock_put(sdp->sd_freeze_gl);
fail_rename:
	gfs2_glock_put(sdp->sd_rename_gl);
fail_live:
	gfs2_glock_dq_uninit(&sdp->sd_live_gh);
fail_mount:
	gfs2_glock_dq_uninit(mount_gh);
fail:
	return error;
}

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227
100.00%
2
100.00%



static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
			    u64 no_addr, const char *name)
{
	struct gfs2_sbd *sdp = sb->s_fs_info;
	struct dentry *dentry;
	struct inode *inode;

	inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0,
				  GFS2_BLKST_FREE /* ignore */);
	if (IS_ERR(inode)) {
		fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
		return PTR_ERR(inode);
	}
	dentry = d_make_root(inode);
	if (!dentry) {
		fs_err(sdp, "can't alloc %s dentry\n", name);
		return -ENOMEM;
	}
	*dptr = dentry;
	return 0;
}

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2.42%
1
12.50%
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benjamin marzinski
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0.81%
1
12.50%
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al viro
1
0.81%
1
12.50%
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124
100.00%
8
100.00%



static int init_sb(struct gfs2_sbd *sdp, int silent)
{
	struct super_block *sb = sdp->sd_vfs;
	struct gfs2_holder sb_gh;
	u64 no_addr;
	int ret;

	ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
				LM_ST_SHARED, 0, &sb_gh);
	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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
david teigland
david teigland
192
63.16%
1
11.11%
steven whitehouse
steven whitehouse
107
35.20%
6
66.67%
robert s. peterson
robert s. peterson
3
0.99%
1
11.11%
martin k. petersen
martin k. petersen
2
0.66%
1
11.11%
Total
304
100.00%
9
100.00%



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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
steven whitehouse
steven whitehouse
45
66.18%
2
66.67%
david teigland
david teigland
23
33.82%
1
33.33%
Total
68
100.00%
3
100.00%

/**
 * 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_LIST_HEAD(&jd->jd_revoke_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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
steven whitehouse
steven whitehouse
304
96.82%
2
50.00%
robert s. peterson
robert s. peterson
8
2.55%
1
25.00%
tejun heo
tejun heo
2
0.64%
1
25.00%
Total
314
100.00%
4
100.00%

/**
 * check_journal_clean - Make sure a journal is clean for a spectator mount
 * @sdp: The GFS2 superblock
 * @jd: The journal descriptor
 *
 * Returns: 0 if the journal is clean or locked, else an error
 */


static int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd)
{
	int error;
	struct gfs2_holder j_gh;
	struct gfs2_log_header_host head;
	struct gfs2_inode *ip;

	ip = GFS2_I(jd->jd_inode);
	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP |
				   GL_EXACT | GL_NOCACHE, &j_gh);
	if (error) {