Commit 7b813c46 authored by Sage Weil's avatar Sage Weil
Browse files

ceph: reduce parse_mount_args stack usage 



Since we've increased the max mon count, we shouldn't put the addr array
on the parse_mount_args stack.  Put it on the heap instead.

Signed-off-by: default avatarSage Weil <sage@newdream.net>
parent ecb19c46

fs/ceph/super.c

+17 −8
Original line number Diff line number Diff line
@@ -314,12 +314,16 @@ static int parse_mount_args(struct ceph_client *client, 
	int err;

	substring_t argstr[MAX_OPT_ARGS];

	int num_mon;

	struct ceph_entity_addr mon_addr[CEPH_MAX_MON];

	struct ceph_entity_addr *mon_addr;

	int i;



	dout("parse_mount_args dev_name '%s'\n", dev_name);

	memset(args, 0, sizeof(*args));



	mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*mon_addr), GFP_KERNEL);

	if (!mon_addr)

		return -ENOMEM;



	/* start with defaults */

	args->sb_flags = flags;

	args->flags = CEPH_OPT_DEFAULT;
@@ -333,27 +337,29 @@ static int parse_mount_args(struct ceph_client *client, 
	args->max_readdir = 1024;



	/* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */

	err = -EINVAL;

	if (!dev_name)

		return -EINVAL;

		goto out;

	*path = strstr(dev_name, ":/");

	if (*path == NULL) {

		pr_err("device name is missing path (no :/ in %s)\n",

		       dev_name);

		return -EINVAL;

		goto out;

	}



	/* get mon ip(s) */

	err = ceph_parse_ips(dev_name, *path, mon_addr,

			     CEPH_MAX_MON, &num_mon);

	if (err < 0)

		return err;

		goto out;



	/* build initial monmap */

	err = -ENOMEM;

	client->monc.monmap = kzalloc(sizeof(*client->monc.monmap) +

			       num_mon*sizeof(client->monc.monmap->mon_inst[0]),

			       GFP_KERNEL);

	if (!client->monc.monmap)

		return -ENOMEM;

		goto out;

	for (i = 0; i < num_mon; i++) {

		client->monc.monmap->mon_inst[i].addr = mon_addr[i];

		client->monc.monmap->mon_inst[i].addr.erank = 0;
@@ -374,11 +380,11 @@ static int parse_mount_args(struct ceph_client *client, 
		int token, intval, ret;

		if (!*c)

			continue;

		err = -EINVAL;

		token = match_token((char *)c, arg_tokens, argstr);

		if (token < 0) {

			pr_err("bad mount option at '%s'\n", c);

			return -EINVAL;



			goto out;

		}

		if (token < Opt_ip) {

			ret = match_int(&argstr[0], &intval);
@@ -468,8 +474,11 @@ static int parse_mount_args(struct ceph_client *client, 
			BUG_ON(token);

		}

	}

	err = 0;



	return 0;

out:

	kfree(mon_addr);

	return err;

}



static void release_mount_args(struct ceph_mount_args *args)