Attachment 314898 Details for Bug 457798 – RHEL5 port of upstream patch

[patch] RHEL5 port of upstream patch

bz457798-RHEL5.patch (text/plain), 37.11 KB, created by Abhijith Das on 2008-08-25 04:49:12 UTC

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Creator: Abhijith Das

Created: 2008-08-25 04:49:12 UTC

Size: 37.11 KB

patch

obsolete

>diff -Nupr a/fs/gfs2/incore.h b/fs/gfs2/incore.h
>--- a/fs/gfs2/incore.h	2008-08-20 09:05:27.000000000 -0500
>+++ b/fs/gfs2/incore.h	2008-08-20 16:07:12.000000000 -0500
>@@ -408,14 +408,12 @@ struct gfs2_args {
> 	int ar_quota; /* off/account/on */
> 	int ar_suiddir; /* suiddir support */
> 	int ar_data; /* ordered/writeback */
>+	int ar_meta; /* mount metafs */
> };
> 
> struct gfs2_tune {
> 	spinlock_t gt_spin;
> 
>-	unsigned int gt_ilimit;
>-	unsigned int gt_ilimit_tries;
>-	unsigned int gt_ilimit_min;
> 	unsigned int gt_demote_secs; /* Cache retention for unheld glock */
> 	unsigned int gt_incore_log_blocks;
> 	unsigned int gt_log_flush_secs;
>@@ -435,10 +433,8 @@ struct gfs2_tune {
> 	unsigned int gt_new_files_jdata;
> 	unsigned int gt_new_files_directio;
> 	unsigned int gt_max_readahead; /* Max bytes to read-ahead from disk */
>-	unsigned int gt_lockdump_size;
> 	unsigned int gt_stall_secs; /* Detects trouble! */
> 	unsigned int gt_complain_secs;
>-	unsigned int gt_reclaim_limit; /* Max num of glocks in reclaim list */
> 	unsigned int gt_statfs_quantum;
> 	unsigned int gt_statfs_slow;
> };
>@@ -476,7 +472,6 @@ struct gfs2_sb_host {
> 
> struct gfs2_sbd {
> 	struct super_block *sd_vfs;
>-	struct super_block *sd_vfs_meta;
> 	struct kobject sd_kobj;
> 	unsigned long sd_flags;	/* SDF_... */
> 	struct gfs2_sb_host sd_sb;
>@@ -514,7 +509,9 @@ struct gfs2_sbd {
> 
> 	/* Inode Stuff */
> 
>-	struct inode *sd_master_dir;
>+	struct dentry *sd_master_dir;
>+	struct dentry *sd_root_dir;
>+
> 	struct inode *sd_jindex;
> 	struct inode *sd_inum_inode;
> 	struct inode *sd_statfs_inode;
>@@ -652,7 +649,6 @@ struct gfs2_sbd {
> 	/* Debugging crud */
> 
> 	unsigned long sd_last_warning;
>-	struct vfsmount *sd_gfs2mnt;
> 	struct dentry *debugfs_dir;    /* debugfs directory */
> 	struct dentry *debugfs_dentry_glocks; /* for debugfs */
> };
>diff -Nupr a/fs/gfs2/mount.c b/fs/gfs2/mount.c
>--- a/fs/gfs2/mount.c	2008-08-20 09:05:27.000000000 -0500
>+++ b/fs/gfs2/mount.c	2008-08-20 09:07:33.000000000 -0500
>@@ -42,6 +42,7 @@ enum {
> 	Opt_nosuiddir,
> 	Opt_data_writeback,
> 	Opt_data_ordered,
>+	Opt_meta,
> 	Opt_err,
> };
> 
>@@ -66,6 +67,7 @@ static match_table_t tokens = {
> 	{Opt_nosuiddir, "nosuiddir"},
> 	{Opt_data_writeback, "data=writeback"},
> 	{Opt_data_ordered, "data=ordered"},
>+	{Opt_meta, "meta"},
> 	{Opt_err, NULL}
> };
> 
>@@ -239,6 +241,11 @@ int gfs2_mount_args(struct gfs2_sbd *sdp
> 		case Opt_data_ordered:
> 			args->ar_data = GFS2_DATA_ORDERED;
> 			break;
>+		case Opt_meta:
>+			if (remount && args->ar_meta != 1)
>+				goto cant_remount;
>+			args->ar_meta = 1;
>+			break;
> 		case Opt_err:
> 		default:
> 			fs_info(sdp, "unknown option: %s\n", o);
>diff -Nupr a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
>--- a/fs/gfs2/ops_fstype.c	2008-08-20 09:05:27.000000000 -0500
>+++ b/fs/gfs2/ops_fstype.c	2008-08-21 09:33:26.000000000 -0500
>@@ -42,6 +42,47 @@
> 
> extern struct dentry_operations gfs2_dops;
> 
>+static const u32 gfs2_old_fs_formats[] = {
>+        0
>+};
>+
>+static const u32 gfs2_old_multihost_formats[] = {
>+        0
>+};
>+
>+/**
>+ * 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_demote_secs = 300;
>+	gt->gt_incore_log_blocks = 1024;
>+	gt->gt_log_flush_secs = 60;
>+	gt->gt_jindex_refresh_secs = 60;
>+	gt->gt_recoverd_secs = 60;
>+	gt->gt_logd_secs = 1;
>+	gt->gt_quotad_secs = 5;
>+	gt->gt_quota_simul_sync = 64;
>+	gt->gt_quota_warn_period = 10;
>+	gt->gt_quota_scale_num = 1;
>+	gt->gt_quota_scale_den = 1;
>+	gt->gt_quota_cache_secs = 300;
>+	gt->gt_quota_quantum = 60;
>+	gt->gt_atime_quantum = 3600;
>+	gt->gt_new_files_jdata = 0;
>+	gt->gt_new_files_directio = 0;
>+	gt->gt_max_readahead = 1 << 18;
>+	gt->gt_stall_secs = 600;
>+	gt->gt_complain_secs = 10;
>+	gt->gt_statfs_quantum = 30;
>+	gt->gt_statfs_slow = 0;
>+}
>+
> static struct gfs2_sbd *init_sbd(struct super_block *sb)
> {
> 	struct gfs2_sbd *sdp;
>@@ -117,6 +158,274 @@ static void init_vfs(struct super_block 
> 	sb->s_flags |= MS_NOATIME | MS_NODIRATIME;
> }
> 
>+/**
>+ * 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, struct gfs2_sb_host *sb, int silent)
>+{
>+	unsigned int x;
>+
>+	if (sb->sb_magic != GFS2_MAGIC ||
>+	    sb->sb_type != GFS2_METATYPE_SB) {
>+		if (!silent)
>+			printk(KERN_WARNING "GFS2: 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;
>+
>+	if (sb->sb_fs_format != GFS2_FORMAT_FS) {
>+		for (x = 0; gfs2_old_fs_formats[x]; x++)
>+			if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
>+				break;
>+
>+		if (!gfs2_old_fs_formats[x]) {
>+			printk(KERN_WARNING
>+			       "GFS2: code version (%u, %u) is incompatible "
>+			       "with ondisk format (%u, %u)\n",
>+			       GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
>+			       sb->sb_fs_format, sb->sb_multihost_format);
>+			printk(KERN_WARNING
>+			       "GFS2: I don't know how to upgrade this FS\n");
>+			return -EINVAL;
>+		}
>+	}
>+
>+	if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
>+		for (x = 0; gfs2_old_multihost_formats[x]; x++)
>+			if (gfs2_old_multihost_formats[x] ==
>+			    sb->sb_multihost_format)
>+				break;
>+
>+		if (!gfs2_old_multihost_formats[x]) {
>+			printk(KERN_WARNING
>+			       "GFS2: code version (%u, %u) is incompatible "
>+			       "with ondisk format (%u, %u)\n",
>+			       GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
>+			       sb->sb_fs_format, sb->sb_multihost_format);
>+			printk(KERN_WARNING
>+			       "GFS2: I don't know how to upgrade this FS\n");
>+			return -EINVAL;
>+		}
>+	}
>+
>+	if (!sdp->sd_args.ar_upgrade) {
>+		printk(KERN_WARNING
>+		       "GFS2: code version (%u, %u) is incompatible "
>+		       "with ondisk format (%u, %u)\n",
>+		       GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
>+		       sb->sb_fs_format, sb->sb_multihost_format);
>+		printk(KERN_INFO
>+		       "GFS2: Use the \"upgrade\" mount option to upgrade "
>+		       "the FS\n");
>+		printk(KERN_INFO "GFS2: See the manual for more details\n");
>+		return -EINVAL;
>+	}
>+
>+	return 0;
>+}
>+
>+static int end_bio_io_page(struct bio *bio, unsigned int bytes_done, int error)
>+{
>+	struct page *page = bio->bi_private;
>+	if (bio->bi_size)
>+		return 1;
>+	if (!error)
>+		SetPageUptodate(page);
>+	else
>+		printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
>+	unlock_page(page);
>+	return 0;
>+}
>+
>+static void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf)
>+{
>+	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);
>+}
>+
>+/**
>+ * 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)
>+{
>+	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 -ENOBUFS;
>+
>+	ClearPageUptodate(page);
>+	ClearPageDirty(page);
>+	lock_page(page);
>+
>+	bio = bio_alloc(GFP_NOFS, 1);
>+	if (unlikely(!bio)) {
>+		__free_page(page);
>+		return -ENOBUFS;
>+	}
>+
>+	bio->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;
>+	submit_bio(READ_SYNC, bio);
>+	wait_on_page_locked(page);
>+	bio_put(bio);
>+	if (!PageUptodate(page)) {
>+		__free_page(page);
>+		return -EIO;
>+	}
>+	p = kmap(page);
>+	gfs2_sb_in(&sdp->sd_sb, p);
>+	kunmap(page);
>+	__free_page(page);
>+	return 0;
>+}
>+/**
>+ * gfs2_read_sb - Read super block
>+ * @sdp: The GFS2 superblock
>+ * @gl: the glock for the superblock (assumed to be held)
>+ * @silent: Don't print message if mount fails
>+ *
>+ */
>+
>+static int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, 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);
>+	if (error) {
>+		if (!silent)
>+			fs_err(sdp, "can't read superblock\n");
>+		return error;
>+	}
>+
>+	error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
>+	if (error)
>+		return error;
>+
>+	sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
>+			       GFS2_BASIC_BLOCK_SHIFT;
>+	sdp->sd_fsb2bb = 1 << 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);
>+
>+	/* Compute maximum reservation required to add a entry to a directory */
>+
>+	hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << 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);
>+
>+	return 0;
>+}
>+
> static int init_names(struct gfs2_sbd *sdp, int silent)
> {
> 	char *proto, *table;
>@@ -227,51 +536,59 @@ fail:
> 	return error;
> }
> 
>-static inline struct inode *gfs2_lookup_root(struct super_block *sb,
>-					     u64 no_addr)
>+static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
>+			    u64 no_addr, const char *name)
> {
>-	return gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
>+	struct gfs2_sbd *sdp = sb->s_fs_info;
>+	struct dentry *dentry;
>+	struct inode *inode;
>+
>+	inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
>+	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_alloc_root(inode);
>+	if (!dentry) {
>+		fs_err(sdp, "can't alloc %s dentry\n", name);
>+		iput(inode);
>+		return -ENOMEM;
>+	}
>+	dentry->d_op = &gfs2_dops;
>+	*dptr = dentry;
>+	return 0;
> }
> 
>-static int init_sb(struct gfs2_sbd *sdp, int silent, int undo)
>+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;
>-	struct inode *inode;
>-	int error = 0;
>+	int ret;
> 
>-	if (undo) {
>-		if (sb->s_root) {
>-			dput(sb->s_root);
>-			sb->s_root = NULL;
>-		}
>-		return 0;
>+	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;
> 	}
> 
>-	error = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
>-				 LM_ST_SHARED, 0, &sb_gh);
>-	if (error) {
>-		fs_err(sdp, "can't acquire superblock glock: %d\n", error);
>-		return error;
>-	}
>-
>-	error = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
>-	if (error) {
>-		fs_err(sdp, "can't read superblock: %d\n", error);
>+	ret = gfs2_read_sb(sdp, sb_gh.gh_gl, 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_hardsect_size(sb->s_bdev)) {
>-		error = -EINVAL;
>+		ret = -EINVAL;
> 		fs_err(sdp, "FS block size (%u) is too small for device "
> 		       "block size (%u)\n",
> 		       sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
> 		goto out;
> 	}
> 	if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
>-		error = -EINVAL;
>+		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);
>@@ -281,25 +598,21 @@ static int init_sb(struct gfs2_sbd *sdp,
> 
> 	/* Get the root inode */
> 	no_addr = sdp->sd_sb.sb_root_dir.no_addr;
>-	if (sb->s_type == &gfs2meta_fs_type)
>-		no_addr = sdp->sd_sb.sb_master_dir.no_addr;
>-	inode = gfs2_lookup_root(sb, no_addr);
>-	if (IS_ERR(inode)) {
>-		error = PTR_ERR(inode);
>-		fs_err(sdp, "can't read in root inode: %d\n", error);
>+	ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
>+	if (ret)
> 		goto out;
>-	}
> 
>-	sb->s_root = d_alloc_root(inode);
>-	if (!sb->s_root) {
>-		fs_err(sdp, "can't get root dentry\n");
>-		error = -ENOMEM;
>-		iput(inode);
>+	/* 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->d_op = &gfs2_dops;
>+	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 error;
>+	return ret;
> }
> 
> /**
>@@ -365,6 +678,7 @@ int map_journal_extents(struct gfs2_sbd 
> 
> 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 task_struct *p;
> 	struct gfs2_inode *ip;
>@@ -376,7 +690,7 @@ static int init_journal(struct gfs2_sbd 
> 		goto fail_recoverd;
> 	}
> 
>-	sdp->sd_jindex = gfs2_lookup_simple(sdp->sd_master_dir, "jindex");
>+	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);
>@@ -498,25 +812,17 @@ static int init_inodes(struct gfs2_sbd *
> {
> 	int error = 0;
> 	struct gfs2_inode *ip;
>-	struct inode *inode;
>+	struct inode *master = sdp->sd_master_dir->d_inode;
> 
> 	if (undo)
> 		goto fail_qinode;
> 
>-	inode = gfs2_lookup_root(sdp->sd_vfs, sdp->sd_sb.sb_master_dir.no_addr);
>-	if (IS_ERR(inode)) {
>-		error = PTR_ERR(inode);
>-		fs_err(sdp, "can't read in master directory: %d\n", error);
>-		goto fail;
>-	}
>-	sdp->sd_master_dir = inode;
>-
> 	error = init_journal(sdp, undo);
> 	if (error)
>-		goto fail_master;
>+		goto fail;
> 
> 	/* Read in the master inode number inode */
>-	sdp->sd_inum_inode = gfs2_lookup_simple(sdp->sd_master_dir, "inum");
>+	sdp->sd_inum_inode = gfs2_lookup_simple(master, "inum");
> 	if (IS_ERR(sdp->sd_inum_inode)) {
> 		error = PTR_ERR(sdp->sd_inum_inode);
> 		fs_err(sdp, "can't read in inum inode: %d\n", error);
>@@ -525,7 +831,7 @@ static int init_inodes(struct gfs2_sbd *
> 
> 
> 	/* Read in the master statfs inode */
>-	sdp->sd_statfs_inode = gfs2_lookup_simple(sdp->sd_master_dir, "statfs");
>+	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);
>@@ -533,7 +839,7 @@ static int init_inodes(struct gfs2_sbd *
> 	}
> 
> 	/* Read in the resource index inode */
>-	sdp->sd_rindex = gfs2_lookup_simple(sdp->sd_master_dir, "rindex");
>+	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);
>@@ -544,7 +850,7 @@ static int init_inodes(struct gfs2_sbd *
> 	sdp->sd_rindex_uptodate = 0;
> 
> 	/* Read in the quota inode */
>-	sdp->sd_quota_inode = gfs2_lookup_simple(sdp->sd_master_dir, "quota");
>+	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);
>@@ -563,8 +869,6 @@ fail_inum:
> 	iput(sdp->sd_inum_inode);
> fail_journal:
> 	init_journal(sdp, UNDO);
>-fail_master:
>-	iput(sdp->sd_master_dir);
> fail:
> 	return error;
> }
>@@ -575,6 +879,7 @@ static int init_per_node(struct gfs2_sbd
> 	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;
>@@ -582,7 +887,7 @@ static int init_per_node(struct gfs2_sbd
> 	if (undo)
> 		goto fail_qc_gh;
> 
>-	pn = gfs2_lookup_simple(sdp->sd_master_dir, "per_node");
>+	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);
>@@ -758,7 +1063,7 @@ static int fill_super(struct super_block
> 	if (error)
> 		goto fail_lm;
> 
>-	error = init_sb(sdp, silent, DO);
>+	error = init_sb(sdp, silent);
> 	if (error)
> 		goto fail_locking;
> 
>@@ -799,7 +1104,11 @@ fail_per_node:
> fail_inodes:
> 	init_inodes(sdp, UNDO);
> fail_sb:
>-	init_sb(sdp, 0, UNDO);
>+	if (sdp->sd_root_dir)
>+		dput(sdp->sd_root_dir);
>+	if (sdp->sd_master_dir)
>+		dput(sdp->sd_master_dir);
>+	sb->s_root = NULL;
> fail_locking:
> 	init_locking(sdp, &mount_gh, UNDO);
> fail_lm:
>@@ -817,155 +1126,60 @@ fail:
> }
> 
> static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
>-		const char *dev_name, void *data, struct vfsmount *mnt)
>-{
>-	struct super_block *sb;
>-	struct gfs2_sbd *sdp;
>-	int error = get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
>-	if (error)
>-		goto out;
>-	sb = mnt->mnt_sb;
>-	sdp = sb->s_fs_info;
>-	sdp->sd_gfs2mnt = mnt;
>-out:
>-	return error;
>-}
>-
>-static int fill_super_meta(struct super_block *sb, struct super_block *new,
>-			   void *data, int silent)
>-{
>-	struct gfs2_sbd *sdp = sb->s_fs_info;
>-	struct inode *inode;
>-	int error = 0;
>-
>-	new->s_fs_info = sdp;
>-	sdp->sd_vfs_meta = sb;
>-
>-	init_vfs(new, SDF_NOATIME);
>-
>-        /* Get the master inode */
>-	inode = igrab(sdp->sd_master_dir);
>-
>-	new->s_root = d_alloc_root(inode);
>-	if (!new->s_root) {
>-		fs_err(sdp, "can't get root dentry\n");
>-		error = -ENOMEM;
>-		iput(inode);
>-	} else
>-		new->s_root->d_op = &gfs2_dops;
>-
>-	return error;
>-}
>-
>-static int set_bdev_super(struct super_block *s, void *data)
>-{
>-	s->s_bdev = data;
>-	s->s_dev = s->s_bdev->bd_dev;
>-	return 0;
>-}
>-
>-static int test_bdev_super(struct super_block *s, void *data)
>+			const char *dev_name, void *data, struct vfsmount *mnt)
> {
>-	return s->s_bdev == data;
>+	return get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
> }
> 
>-static struct super_block* get_gfs2_sb(const char *dev_name)
>+static struct super_block *get_gfs2_sb(const char *dev_name)
> {
>-	struct kstat stat;
>+	struct super_block *sb;
> 	struct nameidata nd;
>-	struct file_system_type *fstype;
>-	struct super_block *sb = NULL, *s;
>-	struct list_head *l;
> 	int error;
> 
> 	error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
> 	if (error) {
>-		printk(KERN_WARNING "GFS2: path_lookup on %s returned error\n",
>-		       dev_name);
>-		goto out;
>-	}
>-	error = vfs_getattr(nd.mnt, nd.dentry, &stat);
>-
>-	fstype = get_fs_type("gfs2");
>-	list_for_each(l, &fstype->fs_supers) {
>-		s = list_entry(l, struct super_block, s_instances);
>-		if ((S_ISBLK(stat.mode) && s->s_dev == stat.rdev) ||
>-		    (S_ISDIR(stat.mode) && s == nd.dentry->d_inode->i_sb)) {
>-			sb = s;
>-			goto free_nd;
>-		}
>+		printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
>+			dev_name, error);
>+		return NULL;
> 	}
>-
>-	printk(KERN_WARNING "GFS2: Unrecognized block device or "
>-	       "mount point %s\n", dev_name);
>-
>-free_nd:
>+	sb = nd.dentry->d_inode->i_sb;
>+	if (sb && (sb->s_type == &gfs2_fs_type))
>+		atomic_inc(&sb->s_active);
>+	else
>+		sb = NULL;
> 	path_release(&nd);
>-out:
> 	return sb;
> }
> 
> static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
> 			    const char *dev_name, void *data, struct vfsmount *mnt)
> {
>-	int error = 0;
>-	struct super_block *sb = NULL, *new;
>+	struct super_block *sb = NULL;
> 	struct gfs2_sbd *sdp;
> 
> 	sb = get_gfs2_sb(dev_name);
> 	if (!sb) {
> 		printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
>-		error = -ENOENT;
>-		goto error;
>+		return -ENOENT;
> 	}
> 	sdp = (struct gfs2_sbd*) sb->s_fs_info;
>-	if (sdp->sd_vfs_meta) {
>-		printk(KERN_WARNING "GFS2: gfs2meta mount already exists\n");
>-		error = -EBUSY;
>-		goto error;
>-	}
>-	down(&sb->s_bdev->bd_mount_sem);
>-	new = sget(fs_type, test_bdev_super, set_bdev_super, sb->s_bdev);
>-	up(&sb->s_bdev->bd_mount_sem);
>-	if (IS_ERR(new)) {
>-		error = PTR_ERR(new);
>-		goto error;
>-	}
>-	module_put(fs_type->owner);
>-	new->s_flags = flags;
>-	strlcpy(new->s_id, sb->s_id, sizeof(new->s_id));
>-	sb_set_blocksize(new, sb->s_blocksize);
>-	error = fill_super_meta(sb, new, data, flags & MS_SILENT ? 1 : 0);
>-	if (error) {
>-		up_write(&new->s_umount);
>-		deactivate_super(new);
>-		goto error;
>-	}
>-
>-	new->s_flags |= MS_ACTIVE;
>-
>-	/* Grab a reference to the gfs2 mount point */
>-	atomic_inc(&sdp->sd_gfs2mnt->mnt_count);
>-	return simple_set_mnt(mnt, new);
>-error:
>-	return error;
>+	mnt->mnt_sb = sb;
>+	mnt->mnt_root = dget(sdp->sd_master_dir);
>+	return 0;
> }
> 
> static void gfs2_kill_sb(struct super_block *sb)
> {
>-	if (sb->s_fs_info) {
>-		gfs2_delete_debugfs_file(sb->s_fs_info);
>-		gfs2_meta_syncfs(sb->s_fs_info);
>-	}
>-	kill_block_super(sb);
>-}
>-
>-static void gfs2_kill_sb_meta(struct super_block *sb)
>-{
> 	struct gfs2_sbd *sdp = sb->s_fs_info;
>-	generic_shutdown_super(sb);
>-	sdp->sd_vfs_meta = NULL;
>-	atomic_dec(&sdp->sd_gfs2mnt->mnt_count);
>+	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);
> }
> 
> struct file_system_type gfs2_fs_type = {
>@@ -980,7 +1194,6 @@ struct file_system_type gfs2meta_fs_type
> 	.name = "gfs2meta",
> 	.fs_flags = FS_REQUIRES_DEV,
> 	.get_sb = gfs2_get_sb_meta,
>-	.kill_sb = gfs2_kill_sb_meta,
> 	.owner = THIS_MODULE,
> };
> 
>diff -Nupr a/fs/gfs2/ops_super.c b/fs/gfs2/ops_super.c
>--- a/fs/gfs2/ops_super.c	2008-08-20 09:05:27.000000000 -0500
>+++ b/fs/gfs2/ops_super.c	2008-08-20 09:07:33.000000000 -0500
>@@ -64,6 +64,39 @@ static int gfs2_write_inode(struct inode
> }
> 
> /**
>+ * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
>+ * @sdp: the filesystem
>+ *
>+ * Returns: errno
>+ */
>+
>+static 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;
>+}
>+
>+/**
>  * gfs2_put_super - Unmount the filesystem
>  * @sb: The VFS superblock
>  *
>@@ -74,12 +107,6 @@ static void gfs2_put_super(struct super_
> 	struct gfs2_sbd *sdp = sb->s_fs_info;
> 	int error;
> 
>-	if (!sdp)
>-		return;
>-
>-	if (!strncmp(sb->s_type->name, "gfs2meta", 8))
>-		return; /* Nothing to do */
>-
> 	/*  Unfreeze the filesystem, if we need to  */
> 
> 	mutex_lock(&sdp->sd_freeze_lock);
>@@ -102,7 +129,6 @@ static void gfs2_put_super(struct super_
> 
> 	/*  Release stuff  */
> 
>-	iput(sdp->sd_master_dir);
> 	iput(sdp->sd_jindex);
> 	iput(sdp->sd_inum_inode);
> 	iput(sdp->sd_statfs_inode);
>@@ -334,6 +360,16 @@ static void gfs2_clear_inode(struct inod
> 	}
> }
> 
>+static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
>+{
>+	do {
>+		if (d1 == d2)
>+			return 1;
>+		d1 = d1->d_parent;
>+	} while (!IS_ROOT(d1));
>+	return 0;
>+}
>+
> /**
>  * gfs2_show_options - Show mount options for /proc/mounts
>  * @s: seq_file structure
>@@ -347,6 +383,8 @@ static int gfs2_show_options(struct seq_
> 	struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
> 	struct gfs2_args *args = &sdp->sd_args;
> 
>+	if (is_ancestor(mnt->mnt_root, sdp->sd_master_dir))
>+		seq_printf(s, ",meta");
> 	if (args->ar_lockproto[0])
> 		seq_printf(s, ",lockproto=%s", args->ar_lockproto);
> 	if (args->ar_locktable[0])
>diff -Nupr a/fs/gfs2/super.c b/fs/gfs2/super.c
>--- a/fs/gfs2/super.c	2008-08-20 09:05:27.000000000 -0500
>+++ b/fs/gfs2/super.c	2008-08-20 09:39:11.000000000 -0500
>@@ -33,323 +33,6 @@
> #include "trans.h"
> #include "util.h"
> 
>-static const u32 gfs2_old_fs_formats[] = {
>-        0
>-};
>-
>-static const u32 gfs2_old_multihost_formats[] = {
>-        0
>-};
>-
>-/**
>- * gfs2_tune_init - Fill a gfs2_tune structure with default values
>- * @gt: tune
>- *
>- */
>-
>-void gfs2_tune_init(struct gfs2_tune *gt)
>-{
>-	spin_lock_init(&gt->gt_spin);
>-
>-	gt->gt_ilimit = 100;
>-	gt->gt_ilimit_tries = 3;
>-	gt->gt_ilimit_min = 1;
>-	gt->gt_demote_secs = 300;
>-	gt->gt_incore_log_blocks = 1024;
>-	gt->gt_log_flush_secs = 60;
>-	gt->gt_jindex_refresh_secs = 60;
>-	gt->gt_recoverd_secs = 60;
>-	gt->gt_logd_secs = 1;
>-	gt->gt_quotad_secs = 5;
>-	gt->gt_quota_simul_sync = 64;
>-	gt->gt_quota_warn_period = 10;
>-	gt->gt_quota_scale_num = 1;
>-	gt->gt_quota_scale_den = 1;
>-	gt->gt_quota_cache_secs = 300;
>-	gt->gt_quota_quantum = 60;
>-	gt->gt_atime_quantum = 3600;
>-	gt->gt_new_files_jdata = 0;
>-	gt->gt_new_files_directio = 0;
>-	gt->gt_max_readahead = 1 << 18;
>-	gt->gt_lockdump_size = 131072;
>-	gt->gt_stall_secs = 600;
>-	gt->gt_complain_secs = 10;
>-	gt->gt_reclaim_limit = 5000;
>-	gt->gt_statfs_quantum = 30;
>-	gt->gt_statfs_slow = 0;
>-}
>-
>-/**
>- * 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.
>- */
>-
>-int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb_host *sb, int silent)
>-{
>-	unsigned int x;
>-
>-	if (sb->sb_magic != GFS2_MAGIC ||
>-	    sb->sb_type != GFS2_METATYPE_SB) {
>-		if (!silent)
>-			printk(KERN_WARNING "GFS2: 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;
>-
>-	if (sb->sb_fs_format != GFS2_FORMAT_FS) {
>-		for (x = 0; gfs2_old_fs_formats[x]; x++)
>-			if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
>-				break;
>-
>-		if (!gfs2_old_fs_formats[x]) {
>-			printk(KERN_WARNING
>-			       "GFS2: code version (%u, %u) is incompatible "
>-			       "with ondisk format (%u, %u)\n",
>-			       GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
>-			       sb->sb_fs_format, sb->sb_multihost_format);
>-			printk(KERN_WARNING
>-			       "GFS2: I don't know how to upgrade this FS\n");
>-			return -EINVAL;
>-		}
>-	}
>-
>-	if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
>-		for (x = 0; gfs2_old_multihost_formats[x]; x++)
>-			if (gfs2_old_multihost_formats[x] ==
>-			    sb->sb_multihost_format)
>-				break;
>-
>-		if (!gfs2_old_multihost_formats[x]) {
>-			printk(KERN_WARNING
>-			       "GFS2: code version (%u, %u) is incompatible "
>-			       "with ondisk format (%u, %u)\n",
>-			       GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
>-			       sb->sb_fs_format, sb->sb_multihost_format);
>-			printk(KERN_WARNING
>-			       "GFS2: I don't know how to upgrade this FS\n");
>-			return -EINVAL;
>-		}
>-	}
>-
>-	if (!sdp->sd_args.ar_upgrade) {
>-		printk(KERN_WARNING
>-		       "GFS2: code version (%u, %u) is incompatible "
>-		       "with ondisk format (%u, %u)\n",
>-		       GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
>-		       sb->sb_fs_format, sb->sb_multihost_format);
>-		printk(KERN_INFO
>-		       "GFS2: Use the \"upgrade\" mount option to upgrade "
>-		       "the FS\n");
>-		printk(KERN_INFO "GFS2: See the manual for more details\n");
>-		return -EINVAL;
>-	}
>-
>-	return 0;
>-}
>-
>-
>-static int end_bio_io_page(struct bio *bio, unsigned int bytes_done, int error)
>-{
>-	struct page *page = bio->bi_private;
>-	if (bio->bi_size)
>-		return 1;
>-
>-	if (!error)
>-		SetPageUptodate(page);
>-	else
>-		printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
>-	unlock_page(page);
>-	return 0;
>-}
>-
>-static void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf)
>-{
>-	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);
>-}
>-
>-/**
>- * 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
>- */
>-
>-int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector)
>-{
>-	struct super_block *sb = sdp->sd_vfs;
>-	struct gfs2_sb *p;
>-	struct page *page;
>-	struct bio *bio;
>-
>-	page = alloc_page(GFP_KERNEL);
>-	if (unlikely(!page))
>-		return -ENOBUFS;
>-
>-	ClearPageUptodate(page);
>-	ClearPageDirty(page);
>-	lock_page(page);
>-
>-	bio = bio_alloc(GFP_KERNEL, 1);
>-	if (unlikely(!bio)) {
>-		__free_page(page);
>-		return -ENOBUFS;
>-	}
>-
>-	bio->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;
>-	submit_bio(READ_SYNC, bio);
>-	wait_on_page_locked(page);
>-	bio_put(bio);
>-	if (!PageUptodate(page)) {
>-		__free_page(page);
>-		return -EIO;
>-	}
>-	p = kmap(page);
>-	gfs2_sb_in(&sdp->sd_sb, p);
>-	kunmap(page);
>-	__free_page(page);
>-	return 0;
>-}
>-
>-/**
>- * gfs2_read_sb - Read super block
>- * @sdp: The GFS2 superblock
>- * @gl: the glock for the superblock (assumed to be held)
>- * @silent: Don't print message if mount fails
>- *
>- */
>-
>-int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, 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);
>-	if (error) {
>-		if (!silent)
>-			fs_err(sdp, "can't read superblock\n");
>-		return error;
>-	}
>-
>-	error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
>-	if (error)
>-		return error;
>-
>-	sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
>-			       GFS2_BASIC_BLOCK_SHIFT;
>-	sdp->sd_fsb2bb = 1 << 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);
>-
>-	/* Compute maximum reservation required to add a entry to a directory */
>-
>-	hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << 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);
>-
>-	return 0;
>-}
>-
> /**
>  * gfs2_jindex_hold - Grab a lock on the jindex
>  * @sdp: The GFS2 superblock
>@@ -591,39 +274,6 @@ fail:
> 	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;
>diff -Nupr a/fs/gfs2/super.h b/fs/gfs2/super.h
>--- a/fs/gfs2/super.h	2008-08-20 09:05:27.000000000 -0500
>+++ b/fs/gfs2/super.h	2008-08-20 09:10:09.000000000 -0500
>@@ -12,12 +12,6 @@
> 
> #include "incore.h"
> 
>-void gfs2_tune_init(struct gfs2_tune *gt);
>-
>-int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb_host *sb, int silent);
>-int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, int silent);
>-int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector);
>-
> static inline unsigned int gfs2_jindex_size(struct gfs2_sbd *sdp)
> {
> 	unsigned int x;
>@@ -39,7 +33,6 @@ int gfs2_lookup_in_master_dir(struct gfs
> 			      struct gfs2_inode **ipp);
> 
> int gfs2_make_fs_rw(struct gfs2_sbd *sdp);
>-int gfs2_make_fs_ro(struct gfs2_sbd *sdp);
> 
> int gfs2_statfs_init(struct gfs2_sbd *sdp);
> void gfs2_statfs_change(struct gfs2_sbd *sdp,
>diff -Nupr a/fs/gfs2/sys.c b/fs/gfs2/sys.c
>--- a/fs/gfs2/sys.c	2008-08-20 09:05:27.000000000 -0500
>+++ b/fs/gfs2/sys.c	2008-08-20 16:12:10.000000000 -0500
>@@ -430,7 +430,6 @@ TUNE_ATTR(quota_quantum, 0);
> TUNE_ATTR(atime_quantum, 0);
> TUNE_ATTR(max_readahead, 0);
> TUNE_ATTR(complain_secs, 0);
>-TUNE_ATTR(reclaim_limit, 0);
> TUNE_ATTR(statfs_slow, 0);
> TUNE_ATTR(new_files_jdata, 0);
> TUNE_ATTR(new_files_directio, 0);
>@@ -453,7 +452,6 @@ static struct attribute *tune_attrs[] = 
> 	&tune_attr_atime_quantum.attr,
> 	&tune_attr_max_readahead.attr,
> 	&tune_attr_complain_secs.attr,
>-	&tune_attr_reclaim_limit.attr,
> 	&tune_attr_statfs_slow.attr,
> 	&tune_attr_quota_simul_sync.attr,
> 	&tune_attr_quota_cache_secs.attr,

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Attachments on bug 457798: 313463 | 313557 | 313591 | 313671 | 314898