From 2b1e55c389105b722cccadfa47f5615f57d8887f Mon Sep 17 00:00:00 2001 From: Younger Liu Date: Wed, 11 Sep 2013 14:19:44 -0700 Subject: ocfs2: lighten up allocate transaction The issue scenario is as following: When fallocating a very large disk space for a small file, __ocfs2_extend_allocation attempts to get a very large transaction. For some journal sizes, there may be not enough room for this transaction, and the fallocate will fail. The patch below extends & restarts the transaction as necessary while allocating space, and should work with even the smallest journal. This patch refers ext4 resize. Test: # mkfs.ocfs2 -b 4K -C 32K -T datafiles /dev/sdc ...(jounral size is 32M) # mount.ocfs2 /dev/sdc /mnt/ocfs2/ # touch /mnt/ocfs2/1.log # fallocate -o 0 -l 400G /mnt/ocfs2/1.log fallocate: /mnt/ocfs2/1.log: fallocate failed: Cannot allocate memory # tail -f /var/log/messages [ 7372.278591] JBD: fallocate wants too many credits (2051 > 2048) [ 7372.278597] (fallocate,6438,0):__ocfs2_extend_allocation:709 ERROR: status = -12 [ 7372.278603] (fallocate,6438,0):ocfs2_allocate_unwritten_extents:1504 ERROR: status = -12 [ 7372.278607] (fallocate,6438,0):__ocfs2_change_file_space:1955 ERROR: status = -12 ^C With this patch, the test works well. Signed-off-by: Younger Liu Cc: Jie Liu Cc: Joel Becker Cc: Mark Fasheh Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/ocfs2/file.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) (limited to 'fs/ocfs2/file.c') diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c index 3261d71319ee..409c549ae02a 100644 --- a/fs/ocfs2/file.c +++ b/fs/ocfs2/file.c @@ -671,11 +671,7 @@ restarted_transaction: } else { BUG_ON(why != RESTART_TRANS); - /* TODO: This can be more intelligent. */ - credits = ocfs2_calc_extend_credits(osb->sb, - &fe->id2.i_list, - clusters_to_add); - status = ocfs2_extend_trans(handle, credits); + status = ocfs2_allocate_extend_trans(handle, 1); if (status < 0) { /* handle still has to be committed at * this point. */ -- cgit v1.2.3