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Message-ID: <CAA1ppbjN3LdNdixNWb_OdA36UtZy1VDZHKySLpyt_O2rj-a35w@mail.gmail.com> Date: Fri, 28 Jul 2017 14:23:55 +0800 From: Jerry Lee <jerrylee@...p.com> To: linux-ext4@...r.kernel.org, "Theodore Ts'o" <tytso@....edu> Subject: [PATCH] ext4: fix incorrect n_blocks_count result when resizing file system to size larger than 2^32 blocks On 32-bit platform, the value of n_blcoks_count may be wrong during the file system is resized to size larger than 2^32 blocks. This may caused the superblock being corrupted with zero blocks count. Signed-off-by: Jerry Lee <jerrylee@...p.com> --- fs/ext4/resize.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletions(-) diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index c3ed902..035cd3f 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -1927,7 +1927,8 @@ int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) n_desc_blocks = o_desc_blocks + le16_to_cpu(es->s_reserved_gdt_blocks); n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb); - n_blocks_count = n_group * EXT4_BLOCKS_PER_GROUP(sb); + n_blocks_count = (ext4_fsblk_t)n_group * + EXT4_BLOCKS_PER_GROUP(sb); n_group--; /* set to last group number */ }
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