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Commit 5f8c1093 authored by Theodore Ts'o's avatar Theodore Ts'o
Browse files

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: default avatarTheodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
parent f0a459de

fs/ext4/resize.c

+2 −1
Original line number Diff line number Diff line
@@ -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);