On Thu, Dec 11, 2014 at 2:07 AM, Dongsu Park <dongsu.park@xxxxxxxxxxxxxxxx> wrote: > Hi Ming & Kent, > > On 10.12.2014 23:11, Ming Lin wrote: >> > On Wed, Dec 10, 2014 at 02:42:14PM -0800, Ming Lin wrote: >> > Try this fix: >> Yes, it fixed ext4 problem. > > @kent: Thank you for the patch. Indeed it fixes the ext4 lockup I've seen. > I've applied it to my tree, under the branch block-mpage-bvecs-for-next. > See 0d2e05525a58 ("fs/ext4: fix a lockup when writing blocks into ext4 > rootfs") <https://github.com/dongsupark/linux/commit/0d2e05525a58>. > > After that of course, more bugs start to appear, e.g. crash with virtio-blk, > like we'd have opened a can of worms. ;-) > >> Just tried to edit a btrfs file. >> >> [ 45.216351] BTRFS error (device sdb1): partial page write in btrfs with >> offset 0 and length 8192 >> [ 45.217522] BTRFS critical (device sdb1): bad ordered accounting left 0 >> size 4096 > > @ming: I guess you managed to see this error as you're testing with a > SCSI device, not virtio-blk device like me. > Are you seeing it without any back traces? > Does the attached patch fix your issue? > (This is already included in the branch block-mpage-bvecs-for-next.) Hi Dongsu, Yes, I'm testing with a SCSI device. Tested your latest block-mpage-bvecs-for-next. Same problem with BTRFS and no any back traces. Thanks, Ming > > Thanks, > Dongsu > > ==== > > From 7cef37e357b4fd636b3d4aa296e8b67ba8db66d1 Mon Sep 17 00:00:00 2001 > From: Dongsu Park <dongsu.park@xxxxxxxxxxxxxxxx> > Date: Tue, 9 Dec 2014 18:10:10 +0100 > Subject: [PATCH] btrfs: use a correct function for bvec iteration in > btrfs_csum_one_bio() > > Commit 94607a8a("block: Convert various code to bio_for_each_page()") > introduced a critical bug in btrfs_csum_one_bio() using > bio_for_each_page_all() for iterating through each bvec. > That should actually call bio_for_each_page() to take the current > offset into account. Without this fix, xfstests/btrfs/012 would > end up with lockup with warnings in btrfs_add_ordered_sum(), because > iter.bi_size becomes < 0. > > Signed-off-by: Dongsu Park <dongsu.park@xxxxxxxxxxxxxxxx> > --- > fs/btrfs/file-item.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c > index 6a81176..c7ae23c 100644 > --- a/fs/btrfs/file-item.c > +++ b/fs/btrfs/file-item.c > @@ -447,7 +447,7 @@ int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode, > sums->bytenr = (u64)bio->bi_iter.bi_sector << 9; > index = 0; > > - bio_for_each_page_all(bvec, bio, iter) { > + bio_for_each_page(bvec, bio, iter) { > if (!contig) > offset = page_offset(bvec.bv_page) + bvec.bv_offset; > > -- > 1.9.3 > -- 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