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ext4: fix online resizing for bigalloc file systems with a 1k block size 

An online resize of a file system with the bigalloc feature enabled
and a 1k block size would be refused since ext4_resize_begin() did not
understand s_first_data_block is 0 for all bigalloc file systems, even
when the block size is 1k.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
This commit is contained in:
Theodore Ts'o 2018-09-03 22:25:01 -04:00
parent f0a459dec5
commit 5f8c10936f
1 changed files with 2 additions and 1 deletions
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3
fs/ext4/resize.c
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@ -19,6 +19,7 @@
int ext4_resize_begin(struct super_block *sb)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
int ret = 0;
if (!capable(CAP_SYS_RESOURCE))
@ -29,7 +30,7 @@ int ext4_resize_begin(struct super_block *sb)
* because the user tools have no way of handling this. Probably a
* bad time to do it anyways.
*/
if (EXT4_SB(sb)->s_sbh->b_blocknr !=
if (EXT4_B2C(sbi, sbi->s_sbh->b_blocknr) !=
le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) {
ext4_warning(sb, "won't resize using backup superblock at %llu",
(unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr);