On Fri, Apr 27, 2012 at 01:02:08PM +0200, Christian Brunner wrote: > Am 24. April 2012 18:26 schrieb Sage Weil <sage@xxxxxxxxxxxx>: > > On Tue, 24 Apr 2012, Josef Bacik wrote: > >> On Fri, Apr 20, 2012 at 05:09:34PM +0200, Christian Brunner wrote: > >> > After running ceph on XFS for some time, I decided to try btrfs again. > >> > Performance with the current "for-linux-min" branch and big metadata > >> > is much better. The only problem (?) I'm still seeing is a warning > >> > that seems to occur from time to time: > > > > Actually, before you do that... we have a new tool, > > test_filestore_workloadgen, that generates a ceph-osd-like workload on the > > local file system. It's a subset of what a full OSD might do, but if > > we're lucky it will be sufficient to reproduce this issue. Something like > > > > test_filestore_workloadgen --osd-data /foo --osd-journal /bar > > > > will hopefully do the trick. > > > > Christian, maybe you can see if that is able to trigger this warning? > > You'll need to pull it from the current master branch; it wasn't in the > > last release. > > Trying to reproduce with test_filestore_workloadgen didn't work for > me. So here are some instructions on how to reproduce with a minimal > ceph setup. > > You will need a single system with two disks and a bit of memory. > > - Compile and install ceph (detailed instructions: > http://ceph.newdream.net/docs/master/ops/install/mkcephfs/) > > - For the test setup I've used two tmpfs files as journal devices. To > create these, do the following: > > # mkdir -p /ceph/temp > # mount -t tmpfs tmpfs /ceph/temp > # dd if=/dev/zero of=/ceph/temp/journal0 count=500 bs=1024k > # dd if=/dev/zero of=/ceph/temp/journal1 count=500 bs=1024k > > - Now you should create and mount btrfs. Here is what I did: > > # mkfs.btrfs -l 64k -n 64k /dev/sda > # mkfs.btrfs -l 64k -n 64k /dev/sdb > # mkdir /ceph/osd.000 > # mkdir /ceph/osd.001 > # mount -o noatime,space_cache,inode_cache,autodefrag /dev/sda /ceph/osd.000 > # mount -o noatime,space_cache,inode_cache,autodefrag /dev/sdb /ceph/osd.001 > > - Create /etc/ceph/ceph.conf similar to the attached ceph.conf. You > will probably have to change the btrfs devices and the hostname > (os39). > > - Create the ceph filesystems: > > # mkdir /ceph/mon > # mkcephfs -a -c /etc/ceph/ceph.conf > > - Start ceph (e.g. "service ceph start") > > - Now you should be able to use ceph - "ceph -s" will tell you about > the state of the ceph cluster. > > - "rbd create -size 100 testimg" will create an rbd image on the ceph cluster. > > - Compile my test with "gcc -o rbdtest rbdtest.c -lrbd" and run it > with "./rbdtest testimg". > > I can see the first btrfs_orphan_commit_root warning after an hour or > so... I hope that I've described all necessary steps. If there is a > problem just send me a note. > Well I feel like an idiot, I finally get it to reproduce, go look at where I want to put my printks and theres the problem staring me right in the face. I've looked seriously at this problem 2 or 3 times and have missed this every single freaking time. Here is the patch I'm trying, please try it on yours to make sure it fixes the problem. It takes like 2 hours for it to reproduce for me so I won't be able to fully test it until tomorrow, but so far it hasn't broken anything so it should be good. Thanks, Josef diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h index eefe573..4ad628d 100644 --- a/fs/btrfs/btrfs_inode.h +++ b/fs/btrfs/btrfs_inode.h @@ -57,9 +57,6 @@ struct btrfs_inode { /* used to order data wrt metadata */ struct btrfs_ordered_inode_tree ordered_tree; - /* for keeping track of orphaned inodes */ - struct list_head i_orphan; - /* list of all the delalloc inodes in the FS. There are times we need * to write all the delalloc pages to disk, and this list is used * to walk them all. @@ -164,6 +161,7 @@ struct btrfs_inode { unsigned dummy_inode:1; unsigned in_defrag:1; unsigned delalloc_meta_reserved:1; + unsigned has_orphan_item:1; /* * always compress this one file diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 8a89888..6dd20f3 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -1375,7 +1375,7 @@ struct btrfs_root { struct list_head root_list; spinlock_t orphan_lock; - struct list_head orphan_list; + atomic_t orphan_inodes; struct btrfs_block_rsv *orphan_block_rsv; int orphan_item_inserted; int orphan_cleanup_state; diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 7f849b3..8bbe8c4 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -1148,7 +1148,6 @@ static void __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, root->orphan_block_rsv = NULL; INIT_LIST_HEAD(&root->dirty_list); - INIT_LIST_HEAD(&root->orphan_list); INIT_LIST_HEAD(&root->root_list); spin_lock_init(&root->orphan_lock); spin_lock_init(&root->inode_lock); @@ -1161,6 +1160,7 @@ static void __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, atomic_set(&root->log_commit[0], 0); atomic_set(&root->log_commit[1], 0); atomic_set(&root->log_writers, 0); + atomic_set(&root->orphan_inodes, 0); root->log_batch = 0; root->log_transid = 0; root->last_log_commit = 0; diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 0218a4e..0265d40 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -2138,12 +2138,12 @@ void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans, struct btrfs_block_rsv *block_rsv; int ret; - if (!list_empty(&root->orphan_list) || + if (atomic_read(&root->orphan_inodes) || root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE) return; spin_lock(&root->orphan_lock); - if (!list_empty(&root->orphan_list)) { + if (atomic_read(&root->orphan_inodes)) { spin_unlock(&root->orphan_lock); return; } @@ -2200,8 +2200,8 @@ int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode) block_rsv = NULL; } - if (list_empty(&BTRFS_I(inode)->i_orphan)) { - list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list); + if (!BTRFS_I(inode)->has_orphan_item) { + BTRFS_I(inode)->has_orphan_item = 1; #if 0 /* * For proper ENOSPC handling, we should do orphan @@ -2214,6 +2214,7 @@ int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode) insert = 1; #endif insert = 1; + atomic_inc(&root->orphan_inodes); } if (!BTRFS_I(inode)->orphan_meta_reserved) { @@ -2261,9 +2262,8 @@ int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode) int release_rsv = 0; int ret = 0; - spin_lock(&root->orphan_lock); - if (!list_empty(&BTRFS_I(inode)->i_orphan)) { - list_del_init(&BTRFS_I(inode)->i_orphan); + if (BTRFS_I(inode)->has_orphan_item) { + BTRFS_I(inode)->has_orphan_item = 0; delete_item = 1; } @@ -2271,7 +2271,6 @@ int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode) BTRFS_I(inode)->orphan_meta_reserved = 0; release_rsv = 1; } - spin_unlock(&root->orphan_lock); if (trans && delete_item) { ret = btrfs_del_orphan_item(trans, root, btrfs_ino(inode)); @@ -2281,6 +2280,9 @@ int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode) if (release_rsv) btrfs_orphan_release_metadata(inode); + if (trans && delete_item) + atomic_dec(&root->orphan_inodes); + return 0; } @@ -2418,9 +2420,8 @@ int btrfs_orphan_cleanup(struct btrfs_root *root) * add this inode to the orphan list so btrfs_orphan_del does * the proper thing when we hit it */ - spin_lock(&root->orphan_lock); - list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list); - spin_unlock(&root->orphan_lock); + atomic_inc(&root->orphan_inodes); + BTRFS_I(inode)->has_orphan_item = 1; /* if we have links, this was a truncate, lets do that */ if (inode->i_nlink) { @@ -3741,7 +3742,7 @@ void btrfs_evict_inode(struct inode *inode) btrfs_wait_ordered_range(inode, 0, (u64)-1); if (root->fs_info->log_root_recovering) { - BUG_ON(!list_empty(&BTRFS_I(inode)->i_orphan)); + BUG_ON(!BTRFS_I(inode)->has_orphan_item); goto no_delete; } @@ -6921,6 +6922,7 @@ struct inode *btrfs_alloc_inode(struct super_block *sb) ei->in_defrag = 0; ei->delalloc_meta_reserved = 0; ei->complete_ordered = 0; + ei->has_orphan_item = 0; ei->force_compress = BTRFS_COMPRESS_NONE; ei->delayed_node = NULL; @@ -6934,7 +6936,6 @@ struct inode *btrfs_alloc_inode(struct super_block *sb) mutex_init(&ei->log_mutex); mutex_init(&ei->delalloc_mutex); btrfs_ordered_inode_tree_init(&ei->ordered_tree); - INIT_LIST_HEAD(&ei->i_orphan); INIT_LIST_HEAD(&ei->delalloc_inodes); INIT_LIST_HEAD(&ei->ordered_operations); INIT_LIST_HEAD(&ei->ordered_finished); @@ -6980,13 +6981,11 @@ void btrfs_destroy_inode(struct inode *inode) spin_unlock(&root->fs_info->ordered_extent_lock); } - spin_lock(&root->orphan_lock); - if (!list_empty(&BTRFS_I(inode)->i_orphan)) { + if (BTRFS_I(inode)->has_orphan_item) { printk(KERN_INFO "BTRFS: inode %llu still on the orphan list\n", (unsigned long long)btrfs_ino(inode)); - list_del_init(&BTRFS_I(inode)->i_orphan); + atomic_dec(&root->orphan_inodes); } - spin_unlock(&root->orphan_lock); while (1) { ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1); -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
