From 57a450e95932f7798677885b8a01443aca72fdc7 Mon Sep 17 00:00:00 2001 From: Artem Bityutskiy Date: Tue, 30 Dec 2008 16:23:34 +0200 Subject: 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: Artem Bityutskiy --- fs/ubifs/super.c | 40 +++++++++++++++++++++++++++++----------- 1 file changed, 29 insertions(+), 11 deletions(-) (limited to 'fs/ubifs') diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c index 1c1bbe4135c6..2c91d6fa4e05 100644 --- a/fs/ubifs/super.c +++ b/fs/ubifs/super.c @@ -1073,6 +1073,30 @@ again: } } +/** + * 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; -- cgit v1.2.3-58-ga151