Here are the proposed patches to allow the ext3 free block accounting works with more than 8TB storage. [PATCH 1] - Tries to fix the per cpu counter to handle the "overflow" when dealing with unsigned long counters. [PATCH 2] - Currently percpu_counter_read_positive() always return 1 if the counter(singed type) is negative. This leads the ext3 always get free blocks as 1 if there are more than 2**31 free blocks, thus prevent non-root users to write(file creation) to the filesystem. This patch fixed this by using percpu_counter_read() instead. [PATCH 3] - Changes the places in ext3 when updating the free blocks counter to use percpu_counter_mod_ll()(added in patch 1) to prevent overflow. patches against 2.6.16-mm2. Tested on a freshly created 10TB ext3, filled the first 8TB storage with 6000 parallel dd (direct IO) first, then tested the rest 2TB with overnight fsx. - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
