[mdadm PATCH 06/12] ddf: prevent superblock being zeroed on --update
flat view
STALE6202d
From: Dan Williams <hidden>
Date: 2009-10-14 02:10:46
Subsystem:
the rest · Maintainer:
Linus Torvalds
The full fix would be to support updating ddf metadata, but this minimal fix just prevents the superblock from being zeroed when someone inadvertently passes an unsupported --update option during assembly. Reported-by: Hans de Goede <redacted> Signed-off-by: Dan Williams <redacted> --- super-ddf.c | 27 +++++++++++++++++++-------- 1 files changed, 19 insertions(+), 8 deletions(-)
diff --git a/super-ddf.c b/super-ddf.c
index 9bf08c2..06858e2 100644
--- a/super-ddf.c
+++ b/super-ddf.c@@ -1589,13 +1589,8 @@ static int init_super_ddf(struct supertype *st, struct phys_disk *pd; struct virtual_disk *vd; - if (!info) { - st->sb = NULL; - return 0; - } if (st->sb) - return init_super_ddf_bvd(st, info, size, name, homehost, - uuid); + return init_super_ddf_bvd(st, info, size, name, homehost, uuid); if (posix_memalign((void**)&ddf, 512, sizeof(*ddf)) != 0) { fprintf(stderr, Name ": %s could not allocate superblock\n", __func__);
@@ -1604,6 +1599,12 @@ static int init_super_ddf(struct supertype *st, memset(ddf, 0, sizeof(*ddf)); ddf->dlist = NULL; /* no physical disks yet */ ddf->conflist = NULL; /* No virtual disks yet */ + st->sb = ddf; + + if (info == NULL) { + /* zeroing superblock */ + return 0; + } /* At least 32MB *must* be reserved for the ddf. So let's just * start 32MB from the end, and put the primary header there.
@@ -2971,12 +2972,22 @@ static struct mdinfo *container_content_ddf(struct supertype *st) return rest; } -static int store_zero_ddf(struct supertype *st, int fd) +static int store_super_ddf(struct supertype *st, int fd) { + struct ddf_super *ddf = st->sb; unsigned long long dsize; void *buf; int rc; + if (!ddf) + return 1; + + /* ->dlist and ->conflist will be set for updates, currently not + * supported + */ + if (ddf->dlist || ddf->conflist) + return 1; + if (!get_dev_size(fd, NULL, &dsize)) return 1;
@@ -3627,7 +3638,7 @@ struct superswitch super_ddf = { .load_super = load_super_ddf, .init_super = init_super_ddf, - .store_super = store_zero_ddf, + .store_super = store_super_ddf, .free_super = free_super_ddf, .match_metadata_desc = match_metadata_desc_ddf, .container_content = container_content_ddf,