Commit 57a450e9 authored by Artem Bityutskiy's avatar Artem Bityutskiy
Browse files

UBIFS: allow mounting when short of space 



It is fine if there is not free space - we should still allow mounting
this FS. This patch relaxes the free space requirements and adds info
dumps.

Signed-off-by: default avatarArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
parent a9f2fc0e

fs/ubifs/super.c

+29 −11
Original line number Diff line number Diff line
@@ -1073,6 +1073,30 @@ static void bu_init(struct ubifs_info *c) 
	}

}



/**

 * check_free_space - check if there is enough free space to mount.

 * @c: UBIFS file-system description object

 *

 * This function makes sure UBIFS has enough free space to be mounted in

 * read/write mode. UBIFS must always have some free space to allow deletions.

 */

static int check_free_space(struct ubifs_info *c)

{

	ubifs_assert(c->dark_wm > 0);

	if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) {

		ubifs_err("insufficient free space to mount in read/write mode");

		dbg_dump_budg(c);

		dbg_dump_lprops(c);

		/*

		 * We return %-EINVAL instead of %-ENOSPC because it seems to

		 * be the closest error code mentioned in the mount function

		 * documentation.

		 */

		return -EINVAL;

	}

	return 0;

}



/**

 * mount_ubifs - mount UBIFS file-system.

 * @c: UBIFS file-system description object
@@ -1154,7 +1178,7 @@ static int mount_ubifs(struct ubifs_info *c) 


	/*

	 * Make sure the compressor which is set as default in the superblock

	 * or overriden by mount options is actually compiled in.

	 * or overridden by mount options is actually compiled in.

	 */

	if (!ubifs_compr_present(c->default_compr)) {

		ubifs_err("'compressor \"%s\" is not compiled in",
@@ -1236,12 +1260,9 @@ static int mount_ubifs(struct ubifs_info *c) 
	if (!mounted_read_only) {

		int lnum;



		/* Check for enough free space */

		if (ubifs_calc_available(c, c->min_idx_lebs) <= 0) {

			ubifs_err("insufficient available space");

			err = -EINVAL;

		err = check_free_space(c);

		if (err)

			goto out_orphans;

		}



		/* Check for enough log space */

		lnum = c->lhead_lnum + 1;
@@ -1442,12 +1463,9 @@ static int ubifs_remount_rw(struct ubifs_info *c) 
	c->remounting_rw = 1;

	c->always_chk_crc = 1;



	/* Check for enough free space */

	if (ubifs_calc_available(c, c->min_idx_lebs) <= 0) {

		ubifs_err("insufficient available space");

		err = -EINVAL;

	err = check_free_space(c);

	if (err)

		goto out;

	}



	if (c->old_leb_cnt != c->leb_cnt) {

		struct ubifs_sb_node *sup;