ext4: fix online resizing for bigalloc file systems with a 1k block size (5f8c1093) · Commits · 戴 / test

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

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);

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