ext4: fix growing of tiny filesystems
The estimate of necessary transaction credits in ext4_flex_group_add() is too pessimistic. It reserves credit for sb, resize inode, and resize inode dindirect block for each group added in a flex group although they are always the same block and thus it is enough to account them only once. Also the number of modified GDT block is overestimated since we fit EXT4_DESC_PER_BLOCK(sb) descriptors in one block. Make the estimation more precise. That reduces number of requested credits enough that we can grow 20 MB filesystem (which has 1 MB journal, 79 reserved GDT blocks, and flex group size 16 by default). Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NTheodore Ts'o <tytso@mit.edu> Reviewed-by: NEric Sandeen <sandeen@redhat.com>
Showing
想要评论请 注册 或 登录