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Date: Thu, 24 Aug 2017 15:35:39 +0200 From: Lukas Czerner <lczerner@...hat.com> To: linux-ext4@...r.kernel.org Cc: Lukas Czerner <lczerner@...hat.com> Subject: [PATCH 2/2] libext2fs: Skip start_blk adjustment when stride and flex_bg is set Currently some stride optimization is done in ext2fs_allocate_group_table() by adjusting start_blk block where we start allocating block, or inode bitmaps. However in flex_bg case this is currently useless since the values are going to be overridden anyway. Moreover in flex_bg case the group might already be full and the stride optimization will fail. As a result file system resize might fail needlessly in some situations. It can be shown by this example: mke2fs -b 1024 -i 1024 -E stride=8192 -t ext4 /dev/loop0 1024000 resize2fs /dev/loop0 102400000 resize2fs 1.43.5 (04-Aug-2017) Resizing the filesystem on /dev/loop0 to 102400000 (1k) blocks. ./resize/resize2fs: Could not allocate block in ext2 filesystem while trying to resize /dev/loop0 Please run 'e2fsck -fy /dev/loop0' to fix the filesystem after the aborted resize operation. Fix this by not doing the stride adjustment in case of flex_bg. Signed-off-by: Lukas Czerner <lczerner@...hat.com> --- lib/ext2fs/alloc_tables.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/ext2fs/alloc_tables.c b/lib/ext2fs/alloc_tables.c index 407283f..0a36630 100644 --- a/lib/ext2fs/alloc_tables.c +++ b/lib/ext2fs/alloc_tables.c @@ -107,7 +107,7 @@ errcode_t ext2fs_allocate_group_table(ext2_filsys fs, dgrp_t group, /* * Allocate the block and inode bitmaps, if necessary */ - if (fs->stride) { + if (fs->stride && !flexbg_size) { retval = ext2fs_get_free_blocks2(fs, group_blk, last_blk, 1, bmap, &start_blk); if (retval) -- 2.7.5
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