From: Theodore Ts'o Date: Thu, 31 Jul 2014 02:17:17 +0000 (-0400) Subject: ext4: fix ext4_discard_allocated_blocks() if we can't allocate the pa struct X-Git-Tag: v3.2.64~202 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5024a6ef2ed20ef5553288ca6abb9cb10126c632;p=pandora-kernel.git ext4: fix ext4_discard_allocated_blocks() if we can't allocate the pa struct commit 86f0afd463215fc3e58020493482faa4ac3a4d69 upstream. If there is a failure while allocating the preallocation structure, a number of blocks can end up getting marked in the in-memory buddy bitmap, and then not getting released. This can result in the following corruption getting reported by the kernel: EXT4-fs error (device sda3): ext4_mb_generate_buddy:758: group 1126, 12793 clusters in bitmap, 12729 in gd In that case, we need to release the blocks using mb_free_blocks(). Tested: fs smoke test; also demonstrated that with injected errors, the file system is no longer getting corrupted Google-Bug-Id: 16657874 Signed-off-by: "Theodore Ts'o" Signed-off-by: Ben Hutchings --- Reading git-diff-tree failed