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Commit 50397507 authored by Sunil Mushran's avatar Sunil Mushran Committed by Mark Fasheh
Browse files

ocfs2: Expose the file system state via debugfs 



This patch creates a per mount debugfs file, fs_state, which exposes
information like, cluster stack in use, states of the downconvert, recovery
and commit threads, number of journal txns, some allocation stats, list of
all slots, etc.

Signed-off-by: default avatarSunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: default avatarMark Fasheh <mfasheh@suse.com>
parent 96a6c64b

fs/ocfs2/ocfs2.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -308,6 +308,7 @@ struct ocfs2_super 
	struct ocfs2_dlm_debug *osb_dlm_debug;

	struct ocfs2_dlm_debug *osb_dlm_debug;





	struct dentry *osb_debug_root;

	struct dentry *osb_debug_root;

	struct dentry *osb_ctxt;





	wait_queue_head_t recovery_event;

	wait_queue_head_t recovery_event;

fs/ocfs2/super.c

+176 −0
Original line number Original line Diff line number Diff line
@@ -201,6 +201,170 @@ static const match_table_t tokens = { 
	{Opt_err, NULL}

	{Opt_err, NULL}

};

};





#ifdef CONFIG_DEBUG_FS

static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)

{

	int out = 0;

	int i;

	struct ocfs2_cluster_connection *cconn = osb->cconn;

	struct ocfs2_recovery_map *rm = osb->recovery_map;



	out += snprintf(buf + out, len - out,

			"%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",

			"Device", osb->dev_str, osb->uuid_str,

			osb->fs_generation, osb->vol_label);



	out += snprintf(buf + out, len - out,

			"%10s => State: %d  Flags: 0x%lX\n", "Volume",

			atomic_read(&osb->vol_state), osb->osb_flags);



	out += snprintf(buf + out, len - out,

			"%10s => Block: %lu  Cluster: %d\n", "Sizes",

			osb->sb->s_blocksize, osb->s_clustersize);



	out += snprintf(buf + out, len - out,

			"%10s => Compat: 0x%X  Incompat: 0x%X  "

			"ROcompat: 0x%X\n",

			"Features", osb->s_feature_compat,

			osb->s_feature_incompat, osb->s_feature_ro_compat);



	out += snprintf(buf + out, len - out,

			"%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",

			osb->s_mount_opt, osb->s_atime_quantum);



	out += snprintf(buf + out, len - out,

			"%10s => Stack: %s  Name: %*s  Version: %d.%d\n",

			"Cluster",

			(*osb->osb_cluster_stack == '\0' ?

			 "o2cb" : osb->osb_cluster_stack),

			cconn->cc_namelen, cconn->cc_name,

			cconn->cc_version.pv_major, cconn->cc_version.pv_minor);



	spin_lock(&osb->dc_task_lock);

	out += snprintf(buf + out, len - out,

			"%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "

			"WorkSeq: %lu\n", "DownCnvt",

			task_pid_nr(osb->dc_task), osb->blocked_lock_count,

			osb->dc_wake_sequence, osb->dc_work_sequence);

	spin_unlock(&osb->dc_task_lock);



	spin_lock(&osb->osb_lock);

	out += snprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",

			"Recovery",

			(osb->recovery_thread_task ?

			 task_pid_nr(osb->recovery_thread_task) : -1));

	if (rm->rm_used == 0)

		out += snprintf(buf + out, len - out, " None\n");

	else {

		for (i = 0; i < rm->rm_used; i++)

			out += snprintf(buf + out, len - out, " %d",

					rm->rm_entries[i]);

		out += snprintf(buf + out, len - out, "\n");

	}

	spin_unlock(&osb->osb_lock);



	out += snprintf(buf + out, len - out,

			"%10s => Pid: %d  Interval: %lu  Needs: %d\n", "Commit",

			task_pid_nr(osb->commit_task), osb->osb_commit_interval,

			atomic_read(&osb->needs_checkpoint));



	out += snprintf(buf + out, len - out,

			"%10s => State: %d  NumTxns: %d  TxnId: %lu\n",

			"Journal", osb->journal->j_state,

			atomic_read(&osb->journal->j_num_trans),

			osb->journal->j_trans_id);



	out += snprintf(buf + out, len - out,

			"%10s => GlobalAllocs: %d  LocalAllocs: %d  "

			"SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",

			"Stats",

			atomic_read(&osb->alloc_stats.bitmap_data),

			atomic_read(&osb->alloc_stats.local_data),

			atomic_read(&osb->alloc_stats.bg_allocs),

			atomic_read(&osb->alloc_stats.moves),

			atomic_read(&osb->alloc_stats.bg_extends));



	out += snprintf(buf + out, len - out,

			"%10s => State: %u  Descriptor: %llu  Size: %u bits  "

			"Default: %u bits\n",

			"LocalAlloc", osb->local_alloc_state,

			(unsigned long long)osb->la_last_gd,

			osb->local_alloc_bits, osb->local_alloc_default_bits);



	spin_lock(&osb->osb_lock);

	out += snprintf(buf + out, len - out,

			"%10s => Slot: %d  NumStolen: %d\n", "Steal",

			osb->s_inode_steal_slot,

			atomic_read(&osb->s_num_inodes_stolen));

	spin_unlock(&osb->osb_lock);



	out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",

			"Slots", "Num", "RecoGen");



	for (i = 0; i < osb->max_slots; ++i) {

		out += snprintf(buf + out, len - out,

				"%10s  %c %3d  %10d\n",

				" ",

				(i == osb->slot_num ? '*' : ' '),

				i, osb->slot_recovery_generations[i]);

	}



	return out;

}



static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)

{

	struct ocfs2_super *osb = inode->i_private;

	char *buf = NULL;



	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);

	if (!buf)

		goto bail;



	i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));



	file->private_data = buf;



	return 0;

bail:

	return -ENOMEM;

}



static int ocfs2_debug_release(struct inode *inode, struct file *file)

{

	kfree(file->private_data);

	return 0;

}



static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,

				size_t nbytes, loff_t *ppos)

{

	return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,

				       i_size_read(file->f_mapping->host));

}

#else

static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)

{

	return 0;

}

static int ocfs2_debug_release(struct inode *inode, struct file *file)

{

	return 0;

}

static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,

				size_t nbytes, loff_t *ppos)

{

	return 0;

}

#endif	/* CONFIG_DEBUG_FS */



static struct file_operations ocfs2_osb_debug_fops = {

	.open =		ocfs2_osb_debug_open,

	.release =	ocfs2_debug_release,

	.read =		ocfs2_debug_read,

	.llseek =	generic_file_llseek,

};



/*

/*

 * write_super and sync_fs ripped right out of ext3.

 * write_super and sync_fs ripped right out of ext3.

 */

 */
@@ -926,6 +1090,16 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent) 
		goto read_super_error;

		goto read_super_error;

	}

	}





	osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,

					    osb->osb_debug_root,

					    osb,

					    &ocfs2_osb_debug_fops);

	if (!osb->osb_ctxt) {

		status = -EINVAL;

		mlog_errno(status);

		goto read_super_error;

	}



	status = ocfs2_mount_volume(sb);

	status = ocfs2_mount_volume(sb);

	if (osb->root_inode)

	if (osb->root_inode)

		inode = igrab(osb->root_inode);

		inode = igrab(osb->root_inode);
@@ -1620,6 +1794,8 @@ static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err) 
	osb = OCFS2_SB(sb);

	osb = OCFS2_SB(sb);

	BUG_ON(!osb);

	BUG_ON(!osb);





	debugfs_remove(osb->osb_ctxt);



	ocfs2_disable_quotas(osb);

	ocfs2_disable_quotas(osb);





	ocfs2_shutdown_local_alloc(osb);

	ocfs2_shutdown_local_alloc(osb);