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authorRichard Weinberger <richard@nod.at>2016-06-23 20:30:38 +0300
committerRichard Weinberger <richard@nod.at>2016-07-30 00:32:01 +0300
commit4946784bd3924b1374f05eebff2fd68660bae866 (patch)
tree309fe1d3d97aeabbc6df3b8b40b89b3be20f839d /drivers
parentbc743f34dfa011e62edd0ea4ae8455be06c083b5 (diff)
downloadlinux-4946784bd3924b1374f05eebff2fd68660bae866.tar.xz
ubi: Make volume resize power cut aware
When the volume resize operation shrinks a volume, LEBs will be unmapped. Since unmapping will not erase these LEBs immediately we have to wait for that operation to finish. Otherwise in case of a power cut right after writing the new volume table the UBI attach process can find more LEBs than the volume table knows. This will render the UBI image unattachable. Fix this issue by waiting for erase to complete and write the new volume table afterward. Cc: <stable@vger.kernel.org> Reported-by: Boris Brezillon <boris.brezillon@free-electrons.com> Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/mtd/ubi/vmt.c25
1 files changed, 18 insertions, 7 deletions
diff --git a/drivers/mtd/ubi/vmt.c b/drivers/mtd/ubi/vmt.c
index 10059dfdc1b6..0138f526474a 100644
--- a/drivers/mtd/ubi/vmt.c
+++ b/drivers/mtd/ubi/vmt.c
@@ -488,13 +488,6 @@ int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
spin_unlock(&ubi->volumes_lock);
}
- /* Change volume table record */
- vtbl_rec = ubi->vtbl[vol_id];
- vtbl_rec.reserved_pebs = cpu_to_be32(reserved_pebs);
- err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
- if (err)
- goto out_acc;
-
if (pebs < 0) {
for (i = 0; i < -pebs; i++) {
err = ubi_eba_unmap_leb(ubi, vol, reserved_pebs + i);
@@ -512,6 +505,24 @@ int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
spin_unlock(&ubi->volumes_lock);
}
+ /*
+ * When we shrink a volume we have to flush all pending (erase) work.
+ * Otherwise it can happen that upon next attach UBI finds a LEB with
+ * lnum > highest_lnum and refuses to attach.
+ */
+ if (pebs < 0) {
+ err = ubi_wl_flush(ubi, vol_id, UBI_ALL);
+ if (err)
+ goto out_acc;
+ }
+
+ /* Change volume table record */
+ vtbl_rec = ubi->vtbl[vol_id];
+ vtbl_rec.reserved_pebs = cpu_to_be32(reserved_pebs);
+ err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
+ if (err)
+ goto out_acc;
+
vol->reserved_pebs = reserved_pebs;
if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
vol->used_ebs = reserved_pebs;