Philipp Matthias Hahn
2013-Dec-14 09:58 UTC
[BUG] open_ctree() failes after mounting BTRFS with 3.2 after 3.12
Hello,
I''m not subscribed, so please cc: me.
I''ve an extermal USB disk using BTRFS used for backups and data sharing
between multiple systems using different kernels (3.2.xx, 3.12.5). The
FS fails to mount with 3.12.x, but still works on 3.2.x with the
following dmesg:
btrfs: mismatching generation and generation_v2 found in root item. This root
was probably mounted with an older kernel. Resetting all new fields.
btrfs: mismatching generation and generation_v2 found in root item. This root
was probably mounted with an older kernel. Resetting all new fields.
btrfs: open_ctree failed
Following
<https://btrfs.wiki.kernel.org/index.php/Debugging_Btrfs_with_GDB#Building_UML_Kernel>
here some more debug info. To me it looks like the call to
btrfs_read_fs_root_no_name() fails.
$ gdb --args ./linux ubd0=/dev/sdc2
...
(gdb) handle SIGSEGV pass nostop noprint
(gdb) handle SIGUSR1 pass nostop noprint
(gdb) break open_ctree
(gdb) r
...
[ 0.000000] Linux version 3.12.5 (pmhahn@scout) (gcc version 4.8.2 (Debian
4.8.2-10) ) #9 Sat Dec 14 09:40:10 CET 2013
...
[ 1.120000] Btrfs loaded, debug=on
...
[ 1.120000] ubda: unknown partition table
[ 1.120000] btrfs: device label backup devid 1 transid 5478 /dev/root
Breakpoint 1, open_ctree (sb=sb@entry=0x61d0e400, fs_devices=0x61d15c80,
options=options@entry=0x0) at fs/btrfs/disk-io.c:2096
2096 {
2093 int open_ctree(struct super_block *sb,
2123 tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info);
2096 {
2123 tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info);
2096 {
2118 int num_backups_tried = 0;
2119 int backup_index = 0;
2123 tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info);
2124 chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info);
2125 if (!tree_root || !chunk_root) {
2124 chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info);
2125 if (!tree_root || !chunk_root) {
2130 ret = init_srcu_struct(&fs_info->subvol_srcu);
2131 if (ret) {
2130 ret = init_srcu_struct(&fs_info->subvol_srcu);
2131 if (ret) {
2136 ret = setup_bdi(fs_info, &fs_info->bdi);
2156 fs_info->btree_inode = new_inode(sb);
2136 ret = setup_bdi(fs_info, &fs_info->bdi);
2142 ret = percpu_counter_init(&fs_info->dirty_metadata_bytes,
0);
2147 fs_info->dirty_metadata_batch = PAGE_CACHE_SIZE *
2150 ret = percpu_counter_init(&fs_info->delalloc_bytes, 0);
2136 ret = setup_bdi(fs_info, &fs_info->bdi);
2156 fs_info->btree_inode = new_inode(sb);
2157 if (!fs_info->btree_inode) {
2156 fs_info->btree_inode = new_inode(sb);
2157 if (!fs_info->btree_inode) {
2162 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping,
GFP_NOFS);
2179 mutex_init(&fs_info->reloc_mutex);
2162 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping,
GFP_NOFS);
2165 INIT_LIST_HEAD(&fs_info->trans_list);
2179 mutex_init(&fs_info->reloc_mutex);
2164 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
2165 INIT_LIST_HEAD(&fs_info->trans_list);
2166 INIT_LIST_HEAD(&fs_info->dead_roots);
2164 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
2166 INIT_LIST_HEAD(&fs_info->dead_roots);
2167 INIT_LIST_HEAD(&fs_info->delayed_iputs);
2168 INIT_LIST_HEAD(&fs_info->delalloc_roots);
2169 INIT_LIST_HEAD(&fs_info->caching_block_groups);
2179 mutex_init(&fs_info->reloc_mutex);
2182 init_completion(&fs_info->kobj_unregister);
2180 seqlock_init(&fs_info->profiles_lock);
2182 init_completion(&fs_info->kobj_unregister);
2183 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
2186 btrfs_mapping_init(&fs_info->mapping_tree);
2183 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
2184 INIT_LIST_HEAD(&fs_info->space_info);
2186 btrfs_mapping_init(&fs_info->mapping_tree);
2184 INIT_LIST_HEAD(&fs_info->space_info);
2185 INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
2186 btrfs_mapping_init(&fs_info->mapping_tree);
2187 btrfs_init_block_rsv(&fs_info->global_block_rsv,
2189 btrfs_init_block_rsv(&fs_info->delalloc_block_rsv,
2191 btrfs_init_block_rsv(&fs_info->trans_block_rsv,
BTRFS_BLOCK_RSV_TRANS);
2192 btrfs_init_block_rsv(&fs_info->chunk_block_rsv,
BTRFS_BLOCK_RSV_CHUNK);
2193 btrfs_init_block_rsv(&fs_info->empty_block_rsv,
BTRFS_BLOCK_RSV_EMPTY);
2194 btrfs_init_block_rsv(&fs_info->delayed_block_rsv,
2217 INIT_LIST_HEAD(&fs_info->ordered_roots);
2206 fs_info->free_chunk_space = 0;
2219 fs_info->delayed_root = kmalloc(sizeof(struct
btrfs_delayed_root),
2196 atomic_set(&fs_info->nr_async_submits, 0);
2219 fs_info->delayed_root = kmalloc(sizeof(struct
btrfs_delayed_root),
2198 atomic_set(&fs_info->async_submit_draining, 0);
2201 atomic64_set(&fs_info->tree_mod_seq, 0);
2202 fs_info->sb = sb;
2203 fs_info->max_inline = 8192 * 1024;
2204 fs_info->metadata_ratio = 0;
2205 fs_info->defrag_inodes = RB_ROOT;
2207 fs_info->tree_mod_log = RB_ROOT;
2208 fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
2211 INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS &
~__GFP_WAIT);
2214 fs_info->thread_pool_size = min_t(unsigned long,
2217 INIT_LIST_HEAD(&fs_info->ordered_roots);
2219 fs_info->delayed_root = kmalloc(sizeof(struct
btrfs_delayed_root),
2221 if (!fs_info->delayed_root) {
2219 fs_info->delayed_root = kmalloc(sizeof(struct
btrfs_delayed_root),
2221 if (!fs_info->delayed_root) {
2225 btrfs_init_delayed_root(fs_info->delayed_root);
2227 mutex_init(&fs_info->scrub_lock);
2225 btrfs_init_delayed_root(fs_info->delayed_root);
2227 mutex_init(&fs_info->scrub_lock);
2225 btrfs_init_delayed_root(fs_info->delayed_root);
2227 mutex_init(&fs_info->scrub_lock);
2232 init_waitqueue_head(&fs_info->scrub_pause_wait);
2228 atomic_set(&fs_info->scrubs_running, 0);
2232 init_waitqueue_head(&fs_info->scrub_pause_wait);
2233 init_rwsem(&fs_info->scrub_super_lock);
2240 mutex_init(&fs_info->balance_mutex);
2234 fs_info->scrub_workers_refcnt = 0;
2240 mutex_init(&fs_info->balance_mutex);
2245 init_waitqueue_head(&fs_info->balance_wait_q);
2241 atomic_set(&fs_info->balance_running, 0);
2245 init_waitqueue_head(&fs_info->balance_wait_q);
2244 fs_info->balance_ctl = NULL;
2245 init_waitqueue_head(&fs_info->balance_wait_q);
2249 sb->s_bdi = &fs_info->bdi;
2247 sb->s_blocksize = 4096;
2252 set_nlink(fs_info->btree_inode, 1);
2248 sb->s_blocksize_bits = blksize_bits(4096);
2249 sb->s_bdi = &fs_info->bdi;
2251 fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID;
2252 set_nlink(fs_info->btree_inode, 1);
2258 fs_info->btree_inode->i_size = OFFSET_MAX;
2259 fs_info->btree_inode->i_mapping->a_ops =
&btree_aops;
2260 fs_info->btree_inode->i_mapping->backing_dev_info =
&fs_info->bdi;
2262
RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node);
2264 fs_info->btree_inode->i_mapping);
2263
extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree,
2265 BTRFS_I(fs_info->btree_inode)->io_tree.track_uptodate = 0;
2266
extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree);
2268 BTRFS_I(fs_info->btree_inode)->io_tree.ops =
&btree_extent_io_ops;
2271 memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
2268 BTRFS_I(fs_info->btree_inode)->io_tree.ops =
&btree_extent_io_ops;
2270 BTRFS_I(fs_info->btree_inode)->root = tree_root;
2271 memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
2273 set_bit(BTRFS_INODE_DUMMY,
2275 insert_inode_hash(fs_info->btree_inode);
2281 extent_io_tree_init(&fs_info->freed_extents[0],
2275 insert_inode_hash(fs_info->btree_inode);
2281 extent_io_tree_init(&fs_info->freed_extents[0],
2278 fs_info->block_group_cache_tree = RB_ROOT;
2281 extent_io_tree_init(&fs_info->freed_extents[0],
2279 fs_info->first_logical_byte = (u64)-1;
2281 extent_io_tree_init(&fs_info->freed_extents[0],
2283 extent_io_tree_init(&fs_info->freed_extents[1],
2289 mutex_init(&fs_info->ordered_operations_mutex);
2285 fs_info->pinned_extents = &fs_info->freed_extents[0];
2289 mutex_init(&fs_info->ordered_operations_mutex);
2286 fs_info->do_barriers = 1;
2289 mutex_init(&fs_info->ordered_operations_mutex);
2290 mutex_init(&fs_info->ordered_extent_flush_mutex);
2291 mutex_init(&fs_info->tree_log_mutex);
2292 mutex_init(&fs_info->chunk_mutex);
2293 mutex_init(&fs_info->transaction_kthread_mutex);
2294 mutex_init(&fs_info->cleaner_mutex);
2295 mutex_init(&fs_info->volume_mutex);
2296 init_rwsem(&fs_info->extent_commit_sem);
2297 init_rwsem(&fs_info->cleanup_work_sem);
2298 init_rwsem(&fs_info->subvol_sem);
2299 sema_init(&fs_info->uuid_tree_rescan_sem, 1);
2302
mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount);
2299 sema_init(&fs_info->uuid_tree_rescan_sem, 1);
2302
mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount);
2299 sema_init(&fs_info->uuid_tree_rescan_sem, 1);
2300 fs_info->dev_replace.lock_owner = 0;
2301 atomic_set(&fs_info->dev_replace.nesting_level, 0);
2302
mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount);
2303 mutex_init(&fs_info->dev_replace.lock_management_lock);
2304 mutex_init(&fs_info->dev_replace.lock);
2307 mutex_init(&fs_info->qgroup_ioctl_lock);
2312 fs_info->pending_quota_state = 0;
2309 INIT_LIST_HEAD(&fs_info->dirty_qgroups);
2314 mutex_init(&fs_info->qgroup_rescan_lock);
2308 fs_info->qgroup_tree = RB_ROOT;
2309 INIT_LIST_HEAD(&fs_info->dirty_qgroups);
2310 fs_info->qgroup_seq = 1;
2313 fs_info->qgroup_ulist = NULL;
2314 mutex_init(&fs_info->qgroup_rescan_lock);
2316 btrfs_init_free_cluster(&fs_info->meta_alloc_cluster);
2317 btrfs_init_free_cluster(&fs_info->data_alloc_cluster);
2319 init_waitqueue_head(&fs_info->transaction_throttle);
2320 init_waitqueue_head(&fs_info->transaction_wait);
2321 init_waitqueue_head(&fs_info->transaction_blocked_wait);
2322 init_waitqueue_head(&fs_info->async_submit_wait);
2324 ret = btrfs_alloc_stripe_hash_table(fs_info);
2325 if (ret) {
2324 ret = btrfs_alloc_stripe_hash_table(fs_info);
2325 if (ret) {
2330 __setup_root(4096, 4096, 4096, 4096, tree_root,
2333 invalidate_bdev(fs_devices->latest_bdev);
2338 bh = btrfs_read_dev_super(fs_devices->latest_bdev);
2339 if (!bh) {
2338 bh = btrfs_read_dev_super(fs_devices->latest_bdev);
2339 if (!bh) {
2348 if (btrfs_check_super_csum(bh->b_data)) {
2359 memcpy(fs_info->super_copy, bh->b_data,
sizeof(*fs_info->super_copy));
2360 memcpy(fs_info->super_for_commit, fs_info->super_copy,
2362 brelse(bh);
2364 memcpy(fs_info->fsid, fs_info->super_copy->fsid,
BTRFS_FSID_SIZE);
2373 disk_super = fs_info->super_copy;
2374 if (!btrfs_super_root(disk_super))
2373 disk_super = fs_info->super_copy;
2374 if (!btrfs_super_root(disk_super))
2378 if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_ERROR)
2385 generation = btrfs_super_generation(disk_super);
2386 find_oldest_super_backup(fs_info, generation);
2385 generation = btrfs_super_generation(disk_super);
2386 find_oldest_super_backup(fs_info, generation);
2392 fs_info->compress_type = BTRFS_COMPRESS_ZLIB;
2394 ret = btrfs_parse_options(tree_root, options);
2392 fs_info->compress_type = BTRFS_COMPRESS_ZLIB;
2394 ret = btrfs_parse_options(tree_root, options);
2395 if (ret) {
2394 ret = btrfs_parse_options(tree_root, options);
2395 if (ret) {
2400 features = btrfs_super_incompat_flags(disk_super) &
2402 if (features) {
2410 if (btrfs_super_leafsize(disk_super) !2411
btrfs_super_nodesize(disk_super)) {
2410 if (btrfs_super_leafsize(disk_super) !2419 if
(btrfs_super_leafsize(disk_super) > BTRFS_MAX_METADATA_BLOCKSIZE) {
2429 if (tree_root->fs_info->compress_type ==
BTRFS_COMPRESS_LZO)
2428 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
2429 if (tree_root->fs_info->compress_type ==
BTRFS_COMPRESS_LZO)
2428 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
2432 if (features & BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA)
2439 if (btrfs_super_leafsize(disk_super) > PAGE_CACHE_SIZE) {
2445 nodesize = btrfs_super_nodesize(disk_super);
2447 sectorsize = btrfs_super_sectorsize(disk_super);
2448 stripesize = btrfs_super_stripesize(disk_super);
2447 sectorsize = btrfs_super_sectorsize(disk_super);
2448 stripesize = btrfs_super_stripesize(disk_super);
2449 fs_info->dirty_metadata_batch = leafsize * (1 +
ilog2(nr_cpu_ids));
2450 fs_info->delalloc_batch = sectorsize * 512 * (1 +
ilog2(nr_cpu_ids));
2456 if ((features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS)
&&
2450 fs_info->delalloc_batch = sectorsize * 512 * (1 +
ilog2(nr_cpu_ids));
2456 if ((features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS)
&&
2468 btrfs_set_super_incompat_flags(disk_super, features);
2472 if (!(sb->s_flags & MS_RDONLY) && features) {
2470 features = btrfs_super_compat_ro_flags(disk_super) &
2472 if (!(sb->s_flags & MS_RDONLY) && features) {
2480 btrfs_init_workers(&fs_info->generic_worker,
2483 btrfs_init_workers(&fs_info->workers, "worker",
2487 btrfs_init_workers(&fs_info->delalloc_workers,
"delalloc",
2490 btrfs_init_workers(&fs_info->flush_workers,
"flush_delalloc",
2494 min_t(u64, fs_devices->num_devices,
2493 btrfs_init_workers(&fs_info->submit_workers,
"submit",
2494 min_t(u64, fs_devices->num_devices,
2493 btrfs_init_workers(&fs_info->submit_workers,
"submit",
2497 btrfs_init_workers(&fs_info->caching_workers,
"cache",
2512 btrfs_init_workers(&fs_info->fixup_workers,
"fixup", 1,
2504 fs_info->submit_workers.idle_thresh = 64;
2506 fs_info->workers.idle_thresh = 16;
2512 btrfs_init_workers(&fs_info->fixup_workers,
"fixup", 1,
2507 fs_info->workers.ordered = 1;
2512 btrfs_init_workers(&fs_info->fixup_workers,
"fixup", 1,
2509 fs_info->delalloc_workers.idle_thresh = 2;
2510 fs_info->delalloc_workers.ordered = 1;
2512 btrfs_init_workers(&fs_info->fixup_workers,
"fixup", 1,
2514 btrfs_init_workers(&fs_info->endio_workers,
"endio",
2517 btrfs_init_workers(&fs_info->endio_meta_workers,
"endio-meta",
2520 btrfs_init_workers(&fs_info->endio_meta_write_workers,
2523 btrfs_init_workers(&fs_info->endio_raid56_workers,
2526 btrfs_init_workers(&fs_info->rmw_workers,
2529 btrfs_init_workers(&fs_info->endio_write_workers,
"endio-write",
2532 btrfs_init_workers(&fs_info->endio_freespace_worker,
"freespace-write",
2534 btrfs_init_workers(&fs_info->delayed_workers,
"delayed-meta",
2537 btrfs_init_workers(&fs_info->readahead_workers,
"readahead",
2540 btrfs_init_workers(&fs_info->qgroup_rescan_workers,
"qgroup-rescan", 1,
2560 ret = btrfs_start_workers(&fs_info->workers);
2547 fs_info->endio_workers.idle_thresh = 4;
2548 fs_info->endio_meta_workers.idle_thresh = 4;
2549 fs_info->endio_raid56_workers.idle_thresh = 4;
2550 fs_info->rmw_workers.idle_thresh = 2;
2552 fs_info->endio_write_workers.idle_thresh = 2;
2553 fs_info->endio_meta_write_workers.idle_thresh = 2;
2554 fs_info->readahead_workers.idle_thresh = 2;
2560 ret = btrfs_start_workers(&fs_info->workers);
2561 ret |= btrfs_start_workers(&fs_info->generic_worker);
2560 ret = btrfs_start_workers(&fs_info->workers);
2561 ret |= btrfs_start_workers(&fs_info->generic_worker);
2562 ret |= btrfs_start_workers(&fs_info->submit_workers);
2561 ret |= btrfs_start_workers(&fs_info->generic_worker);
2562 ret |= btrfs_start_workers(&fs_info->submit_workers);
2561 ret |= btrfs_start_workers(&fs_info->generic_worker);
2562 ret |= btrfs_start_workers(&fs_info->submit_workers);
2563 ret |= btrfs_start_workers(&fs_info->delalloc_workers);
2562 ret |= btrfs_start_workers(&fs_info->submit_workers);
2563 ret |= btrfs_start_workers(&fs_info->delalloc_workers);
2564 ret |= btrfs_start_workers(&fs_info->fixup_workers);
2563 ret |= btrfs_start_workers(&fs_info->delalloc_workers);
2564 ret |= btrfs_start_workers(&fs_info->fixup_workers);
2565 ret |= btrfs_start_workers(&fs_info->endio_workers);
2564 ret |= btrfs_start_workers(&fs_info->fixup_workers);
2565 ret |= btrfs_start_workers(&fs_info->endio_workers);
2566 ret |= btrfs_start_workers(&fs_info->endio_meta_workers);
2565 ret |= btrfs_start_workers(&fs_info->endio_workers);
2566 ret |= btrfs_start_workers(&fs_info->endio_meta_workers);
2567 ret |= btrfs_start_workers(&fs_info->rmw_workers);
2566 ret |= btrfs_start_workers(&fs_info->endio_meta_workers);
2567 ret |= btrfs_start_workers(&fs_info->rmw_workers);
2568 ret |=
btrfs_start_workers(&fs_info->endio_raid56_workers);
2567 ret |= btrfs_start_workers(&fs_info->rmw_workers);
2568 ret |=
btrfs_start_workers(&fs_info->endio_raid56_workers);
2569 ret |=
btrfs_start_workers(&fs_info->endio_meta_write_workers);
2568 ret |=
btrfs_start_workers(&fs_info->endio_raid56_workers);
2569 ret |=
btrfs_start_workers(&fs_info->endio_meta_write_workers);
2570 ret |=
btrfs_start_workers(&fs_info->endio_write_workers);
2569 ret |=
btrfs_start_workers(&fs_info->endio_meta_write_workers);
2570 ret |=
btrfs_start_workers(&fs_info->endio_write_workers);
2571 ret |=
btrfs_start_workers(&fs_info->endio_freespace_worker);
2570 ret |=
btrfs_start_workers(&fs_info->endio_write_workers);
2571 ret |=
btrfs_start_workers(&fs_info->endio_freespace_worker);
2572 ret |= btrfs_start_workers(&fs_info->delayed_workers);
2571 ret |=
btrfs_start_workers(&fs_info->endio_freespace_worker);
2572 ret |= btrfs_start_workers(&fs_info->delayed_workers);
2573 ret |= btrfs_start_workers(&fs_info->caching_workers);
2572 ret |= btrfs_start_workers(&fs_info->delayed_workers);
2573 ret |= btrfs_start_workers(&fs_info->caching_workers);
2574 ret |= btrfs_start_workers(&fs_info->readahead_workers);
2573 ret |= btrfs_start_workers(&fs_info->caching_workers);
2574 ret |= btrfs_start_workers(&fs_info->readahead_workers);
2575 ret |= btrfs_start_workers(&fs_info->flush_workers);
2574 ret |= btrfs_start_workers(&fs_info->readahead_workers);
2575 ret |= btrfs_start_workers(&fs_info->flush_workers);
2576 ret |=
btrfs_start_workers(&fs_info->qgroup_rescan_workers);
2575 ret |= btrfs_start_workers(&fs_info->flush_workers);
2576 ret |=
btrfs_start_workers(&fs_info->qgroup_rescan_workers);
2577 if (ret) {
2582 fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super);
2583 fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages,
2582 fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super);
2589 tree_root->stripesize = stripesize;
2583 fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages,
2586 tree_root->nodesize = nodesize;
2583 fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages,
2589 tree_root->stripesize = stripesize;
2592 sb->s_blocksize_bits = blksize_bits(sectorsize);
2586 tree_root->nodesize = nodesize;
2587 tree_root->leafsize = leafsize;
2588 tree_root->sectorsize = sectorsize;
2591 sb->s_blocksize = sectorsize;
2588 tree_root->sectorsize = sectorsize;
2591 sb->s_blocksize = sectorsize;
2592 sb->s_blocksize_bits = blksize_bits(sectorsize);
2594 if (btrfs_super_magic(disk_super) != BTRFS_MAGIC) {
2592 sb->s_blocksize_bits = blksize_bits(sectorsize);
2594 if (btrfs_super_magic(disk_super) != BTRFS_MAGIC) {
2599 if (sectorsize != PAGE_SIZE) {
2605 mutex_lock(&fs_info->chunk_mutex);
2606 ret = btrfs_read_sys_array(tree_root);
2607 mutex_unlock(&fs_info->chunk_mutex);
2606 ret = btrfs_read_sys_array(tree_root);
2607 mutex_unlock(&fs_info->chunk_mutex);
2608 if (ret) {
2614 blocksize = btrfs_level_size(tree_root,
2108 struct btrfs_root *tree_root;
2614 blocksize = btrfs_level_size(tree_root,
2616 generation = btrfs_super_chunk_root_generation(disk_super);
2618 __setup_root(nodesize, leafsize, sectorsize, stripesize,
2616 generation = btrfs_super_chunk_root_generation(disk_super);
2618 __setup_root(nodesize, leafsize, sectorsize, stripesize,
2621 chunk_root->node = read_tree_block(chunk_root,
2624 if (!chunk_root->node ||
2621 chunk_root->node = read_tree_block(chunk_root,
2624 if (!chunk_root->node ||
2625 !test_bit(EXTENT_BUFFER_UPTODATE,
&chunk_root->node->bflags)) {
2624 if (!chunk_root->node ||
2630 btrfs_set_root_node(&chunk_root->root_item,
chunk_root->node);
2631 chunk_root->commit_root = btrfs_root_node(chunk_root);
2633 read_extent_buffer(chunk_root->node,
fs_info->chunk_tree_uuid,
2631 chunk_root->commit_root = btrfs_root_node(chunk_root);
2633 read_extent_buffer(chunk_root->node,
fs_info->chunk_tree_uuid,
2636 ret = btrfs_read_chunk_tree(chunk_root);
2637 if (ret) {
2647 btrfs_close_extra_devices(fs_info, fs_devices, 0);
2649 if (!fs_devices->latest_bdev) {
2666 sb->s_id);
2996 ret = next_root_backup(fs_info, fs_info->super_copy,
2666 sb->s_id);
2656 blocksize = btrfs_level_size(tree_root,
2108 struct btrfs_root *tree_root;
2656 blocksize = btrfs_level_size(tree_root,
2658 generation = btrfs_super_generation(disk_super);
2660 tree_root->node = read_tree_block(tree_root,
2663 if (!tree_root->node ||
2660 tree_root->node = read_tree_block(tree_root,
2663 if (!tree_root->node ||
2664 !test_bit(EXTENT_BUFFER_UPTODATE,
&tree_root->node->bflags)) {
2663 if (!tree_root->node ||
2671 btrfs_set_root_node(&tree_root->root_item,
tree_root->node);
2672 tree_root->commit_root = btrfs_root_node(tree_root);
2678 extent_root = btrfs_read_tree_root(tree_root, &location);
2672 tree_root->commit_root = btrfs_root_node(tree_root);
2678 extent_root = btrfs_read_tree_root(tree_root, &location);
2674 location.objectid = BTRFS_EXTENT_TREE_OBJECTID;
2675 location.type = BTRFS_ROOT_ITEM_KEY;
2676 location.offset = 0;
2678 extent_root = btrfs_read_tree_root(tree_root, &location);
[ 1.120000] btrfs: mismatching generation and generation_v2 found in root
item. This root was probably mounted with an older kernel. Resetting all new
fields.
2679 if (IS_ERR(extent_root)) {
2678 extent_root = btrfs_read_tree_root(tree_root, &location);
2679 if (IS_ERR(extent_root)) {
2687 dev_root = btrfs_read_tree_root(tree_root, &location);
2683 extent_root->track_dirty = 1;
2687 dev_root = btrfs_read_tree_root(tree_root, &location);
2684 fs_info->extent_root = extent_root;
2686 location.objectid = BTRFS_DEV_TREE_OBJECTID;
2687 dev_root = btrfs_read_tree_root(tree_root, &location);
2688 if (IS_ERR(dev_root)) {
2692 dev_root->track_dirty = 1;
2694 btrfs_init_devices_late(fs_info);
2693 fs_info->dev_root = dev_root;
2694 btrfs_init_devices_late(fs_info);
2697 csum_root = btrfs_read_tree_root(tree_root, &location);
2696 location.objectid = BTRFS_CSUM_TREE_OBJECTID;
2697 csum_root = btrfs_read_tree_root(tree_root, &location);
[ 1.120000] btrfs: mismatching generation and generation_v2 found in root
item. This root was probably mounted with an older kernel. Resetting all new
fields.
2698 if (IS_ERR(csum_root)) {
2706 quota_root = btrfs_read_tree_root(tree_root, &location);
2702 csum_root->track_dirty = 1;
2706 quota_root = btrfs_read_tree_root(tree_root, &location);
2703 fs_info->csum_root = csum_root;
2705 location.objectid = BTRFS_QUOTA_TREE_OBJECTID;
2706 quota_root = btrfs_read_tree_root(tree_root, &location);
2707 if (!IS_ERR(quota_root)) {
2715 uuid_root = btrfs_read_tree_root(tree_root, &location);
2714 location.objectid = BTRFS_UUID_TREE_OBJECTID;
2715 uuid_root = btrfs_read_tree_root(tree_root, &location);
2716 if (IS_ERR(uuid_root)) {
2718 if (ret != -ENOENT)
2721 check_uuid_tree = false;
2720 create_uuid_tree = true;
2730 fs_info->generation = generation;
2731 fs_info->last_trans_committed = generation;
2733 ret = btrfs_recover_balance(fs_info);
2734 if (ret) {
2739 ret = btrfs_init_dev_stats(fs_info);
2740 if (ret) {
2746 ret = btrfs_init_dev_replace(fs_info);
2747 if (ret) {
2752 btrfs_close_extra_devices(fs_info, fs_devices, 1);
2754 ret = btrfs_init_space_info(fs_info);
2755 if (ret) {
2760 ret = btrfs_read_block_groups(extent_root);
2761 if (ret) {
2766 btrfs_calc_num_tolerated_disk_barrier_failures(fs_info);
2767 if (fs_info->fs_devices->missing_devices >
2765 fs_info->num_tolerated_disk_barrier_failures 2767
if (fs_info->fs_devices->missing_devices >
2775 fs_info->cleaner_kthread = kthread_run(cleaner_kthread,
tree_root,
2780 fs_info->transaction_kthread =
kthread_run(transaction_kthread,
2786 if (!btrfs_test_opt(tree_root, SSD) &&
2788 !fs_info->fs_devices->rotating) {
2787 !btrfs_test_opt(tree_root, NOSSD) &&
2806 ret = btrfs_read_qgroup_config(fs_info);
2807 if (ret)
2811 if (btrfs_super_log_root(disk_super) != 0) {
2860 ret = btrfs_find_orphan_roots(tree_root);
2861 if (ret)
2864 if (!(sb->s_flags & MS_RDONLY)) {
2882 fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info,
&location);
2878 location.objectid = BTRFS_FS_TREE_OBJECTID;
2879 location.type = BTRFS_ROOT_ITEM_KEY;
2880 location.offset = 0;
2882 fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info,
&location);
2883 if (IS_ERR(fs_info->fs_root)) {
2882 fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info,
&location);
2884 err = PTR_ERR(fs_info->fs_root);
2883 if (IS_ERR(fs_info->fs_root)) {
Error here?
2942 btrfs_free_qgroup_config(fs_info);
2944 kthread_stop(fs_info->transaction_kthread);
2945 btrfs_cleanup_transaction(fs_info->tree_root);
2946 del_fs_roots(fs_info);
2948 kthread_stop(fs_info->cleaner_kthread);
2954 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
2957 btrfs_put_block_group_cache(fs_info);
2958 btrfs_free_block_groups(fs_info);
2961 free_root_pointers(fs_info, 1);
2962 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
2965 btrfs_stop_all_workers(fs_info);
2968 btrfs_mapping_tree_free(&fs_info->mapping_tree);
2970 iput(fs_info->btree_inode);
2976 bdi_destroy(&fs_info->bdi);
2978 cleanup_srcu_struct(&fs_info->subvol_srcu);
2980 btrfs_free_stripe_hash_table(fs_info);
2981 btrfs_close_devices(fs_info->fs_devices);
3001 }
btrfs_fill_super (silent=1, data=0x0, fs_devices=<optimized out>,
sb=0x61d0e400) at fs/btrfs/super.c:881
881 if (err) {
880 err = open_ctree(sb, fs_devices, (char *)data);
881 if (err) {
btrfs_mount (fs_type=0x602de120 <btrfs_fs_type>, flags=<optimized
out>, device_name=<optimized out>, data=0x0) at fs/btrfs/super.c:1213
1213 error = btrfs_fill_super(s, fs_devices, data,
[ 1.120000] btrfs: open_ctree failed
1218 if (IS_ERR(root))
1219 deactivate_locked_super(s);
1221 return root;
1219 deactivate_locked_super(s);
1228 }
mount_fs (type=type@entry=0x602de120 <btrfs_fs_type>,
flags=flags@entry=32769, name=name@entry=0x61d0f380 "/dev/root",
data=data@entry=0x0) at fs/super.c:1136
If you need more, please ask.
Sincerely
Philipp
--
/ / (_)__ __ ____ __ Philipp Hahn
/ /__/ / _ \/ // /\ \/ /
/____/_/_//_/\_,_/ /_/\_\ pmhahn@pmhahn.de
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Shilong Wang
2013-Dec-15 14:03 UTC
Re: [BUG] open_ctree() failes after mounting BTRFS with 3.2 after 3.12
Hello Philipp, In order to reproduce your problems. I compile btrfs in kernel 3.2 and 3.12. # mkfs.btrfs -f /dev/sda2 # mount /dev/sda2 /mnt # dd if=/dev/zero of=/mnt/data bs=1M count=1024 # umount /mnt The above operations is in 3.2 and then i switch my system into 3.12, and try to mount /dev/sda2 it will output something like the following: btrfs: mismatching generation and generation_v2 found in root item. This root was probably mounted with an older kernel. Resetting all new fields. But it mounted successfully, then i do some similar operations in 3.12...and umount it. and switch into kernel version 3.2... but i failt to mount it in 3.2 and it output the following message. BTRFS: couldn''t mount because of unsupported optional features (20) It seems that here the problem is because incompat features in newer kernel and make older kernel unmountable any more.. But in your problem is that you can still mount on older kernel? but not new kernel? Thanks, Wang 2013/12/14 Philipp Matthias Hahn <pmhahn@pmhahn.de>:> Hello, > > I''m not subscribed, so please cc: me. > > I''ve an extermal USB disk using BTRFS used for backups and data sharing > between multiple systems using different kernels (3.2.xx, 3.12.5). The > FS fails to mount with 3.12.x, but still works on 3.2.x with the > following dmesg: > > btrfs: mismatching generation and generation_v2 found in root item. This root was probably mounted with an older kernel. Resetting all new fields. > btrfs: mismatching generation and generation_v2 found in root item. This root was probably mounted with an older kernel. Resetting all new fields. > btrfs: open_ctree failed > > Following > <https://btrfs.wiki.kernel.org/index.php/Debugging_Btrfs_with_GDB#Building_UML_Kernel> > here some more debug info. To me it looks like the call to > btrfs_read_fs_root_no_name() fails. > > $ gdb --args ./linux ubd0=/dev/sdc2 > ... > (gdb) handle SIGSEGV pass nostop noprint > (gdb) handle SIGUSR1 pass nostop noprint > (gdb) break open_ctree > (gdb) r > ... > [ 0.000000] Linux version 3.12.5 (pmhahn@scout) (gcc version 4.8.2 (Debian 4.8.2-10) ) #9 Sat Dec 14 09:40:10 CET 2013 > ... > [ 1.120000] Btrfs loaded, debug=on > ... > [ 1.120000] ubda: unknown partition table > [ 1.120000] btrfs: device label backup devid 1 transid 5478 /dev/root > > Breakpoint 1, open_ctree (sb=sb@entry=0x61d0e400, fs_devices=0x61d15c80, options=options@entry=0x0) at fs/btrfs/disk-io.c:2096 > 2096 { > 2093 int open_ctree(struct super_block *sb, > 2123 tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info); > 2096 { > 2123 tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info); > 2096 { > 2118 int num_backups_tried = 0; > 2119 int backup_index = 0; > 2123 tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info); > 2124 chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info); > 2125 if (!tree_root || !chunk_root) { > 2124 chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info); > 2125 if (!tree_root || !chunk_root) { > 2130 ret = init_srcu_struct(&fs_info->subvol_srcu); > 2131 if (ret) { > 2130 ret = init_srcu_struct(&fs_info->subvol_srcu); > 2131 if (ret) { > 2136 ret = setup_bdi(fs_info, &fs_info->bdi); > 2156 fs_info->btree_inode = new_inode(sb); > 2136 ret = setup_bdi(fs_info, &fs_info->bdi); > 2142 ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0); > 2147 fs_info->dirty_metadata_batch = PAGE_CACHE_SIZE * > 2150 ret = percpu_counter_init(&fs_info->delalloc_bytes, 0); > 2136 ret = setup_bdi(fs_info, &fs_info->bdi); > 2156 fs_info->btree_inode = new_inode(sb); > 2157 if (!fs_info->btree_inode) { > 2156 fs_info->btree_inode = new_inode(sb); > 2157 if (!fs_info->btree_inode) { > 2162 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS); > 2179 mutex_init(&fs_info->reloc_mutex); > 2162 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS); > 2165 INIT_LIST_HEAD(&fs_info->trans_list); > 2179 mutex_init(&fs_info->reloc_mutex); > 2164 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC); > 2165 INIT_LIST_HEAD(&fs_info->trans_list); > 2166 INIT_LIST_HEAD(&fs_info->dead_roots); > 2164 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC); > 2166 INIT_LIST_HEAD(&fs_info->dead_roots); > 2167 INIT_LIST_HEAD(&fs_info->delayed_iputs); > 2168 INIT_LIST_HEAD(&fs_info->delalloc_roots); > 2169 INIT_LIST_HEAD(&fs_info->caching_block_groups); > 2179 mutex_init(&fs_info->reloc_mutex); > 2182 init_completion(&fs_info->kobj_unregister); > 2180 seqlock_init(&fs_info->profiles_lock); > 2182 init_completion(&fs_info->kobj_unregister); > 2183 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); > 2186 btrfs_mapping_init(&fs_info->mapping_tree); > 2183 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); > 2184 INIT_LIST_HEAD(&fs_info->space_info); > 2186 btrfs_mapping_init(&fs_info->mapping_tree); > 2184 INIT_LIST_HEAD(&fs_info->space_info); > 2185 INIT_LIST_HEAD(&fs_info->tree_mod_seq_list); > 2186 btrfs_mapping_init(&fs_info->mapping_tree); > 2187 btrfs_init_block_rsv(&fs_info->global_block_rsv, > 2189 btrfs_init_block_rsv(&fs_info->delalloc_block_rsv, > 2191 btrfs_init_block_rsv(&fs_info->trans_block_rsv, BTRFS_BLOCK_RSV_TRANS); > 2192 btrfs_init_block_rsv(&fs_info->chunk_block_rsv, BTRFS_BLOCK_RSV_CHUNK); > 2193 btrfs_init_block_rsv(&fs_info->empty_block_rsv, BTRFS_BLOCK_RSV_EMPTY); > 2194 btrfs_init_block_rsv(&fs_info->delayed_block_rsv, > 2217 INIT_LIST_HEAD(&fs_info->ordered_roots); > 2206 fs_info->free_chunk_space = 0; > 2219 fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root), > 2196 atomic_set(&fs_info->nr_async_submits, 0); > 2219 fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root), > 2198 atomic_set(&fs_info->async_submit_draining, 0); > 2201 atomic64_set(&fs_info->tree_mod_seq, 0); > 2202 fs_info->sb = sb; > 2203 fs_info->max_inline = 8192 * 1024; > 2204 fs_info->metadata_ratio = 0; > 2205 fs_info->defrag_inodes = RB_ROOT; > 2207 fs_info->tree_mod_log = RB_ROOT; > 2208 fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; > 2211 INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_WAIT); > 2214 fs_info->thread_pool_size = min_t(unsigned long, > 2217 INIT_LIST_HEAD(&fs_info->ordered_roots); > 2219 fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root), > 2221 if (!fs_info->delayed_root) { > 2219 fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root), > 2221 if (!fs_info->delayed_root) { > 2225 btrfs_init_delayed_root(fs_info->delayed_root); > 2227 mutex_init(&fs_info->scrub_lock); > 2225 btrfs_init_delayed_root(fs_info->delayed_root); > 2227 mutex_init(&fs_info->scrub_lock); > 2225 btrfs_init_delayed_root(fs_info->delayed_root); > 2227 mutex_init(&fs_info->scrub_lock); > 2232 init_waitqueue_head(&fs_info->scrub_pause_wait); > 2228 atomic_set(&fs_info->scrubs_running, 0); > 2232 init_waitqueue_head(&fs_info->scrub_pause_wait); > 2233 init_rwsem(&fs_info->scrub_super_lock); > 2240 mutex_init(&fs_info->balance_mutex); > 2234 fs_info->scrub_workers_refcnt = 0; > 2240 mutex_init(&fs_info->balance_mutex); > 2245 init_waitqueue_head(&fs_info->balance_wait_q); > 2241 atomic_set(&fs_info->balance_running, 0); > 2245 init_waitqueue_head(&fs_info->balance_wait_q); > 2244 fs_info->balance_ctl = NULL; > 2245 init_waitqueue_head(&fs_info->balance_wait_q); > 2249 sb->s_bdi = &fs_info->bdi; > 2247 sb->s_blocksize = 4096; > 2252 set_nlink(fs_info->btree_inode, 1); > 2248 sb->s_blocksize_bits = blksize_bits(4096); > 2249 sb->s_bdi = &fs_info->bdi; > 2251 fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID; > 2252 set_nlink(fs_info->btree_inode, 1); > 2258 fs_info->btree_inode->i_size = OFFSET_MAX; > 2259 fs_info->btree_inode->i_mapping->a_ops = &btree_aops; > 2260 fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi; > 2262 RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node); > 2264 fs_info->btree_inode->i_mapping); > 2263 extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree, > 2265 BTRFS_I(fs_info->btree_inode)->io_tree.track_uptodate = 0; > 2266 extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree); > 2268 BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops; > 2271 memset(&BTRFS_I(fs_info->btree_inode)->location, 0, > 2268 BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops; > 2270 BTRFS_I(fs_info->btree_inode)->root = tree_root; > 2271 memset(&BTRFS_I(fs_info->btree_inode)->location, 0, > 2273 set_bit(BTRFS_INODE_DUMMY, > 2275 insert_inode_hash(fs_info->btree_inode); > 2281 extent_io_tree_init(&fs_info->freed_extents[0], > 2275 insert_inode_hash(fs_info->btree_inode); > 2281 extent_io_tree_init(&fs_info->freed_extents[0], > 2278 fs_info->block_group_cache_tree = RB_ROOT; > 2281 extent_io_tree_init(&fs_info->freed_extents[0], > 2279 fs_info->first_logical_byte = (u64)-1; > 2281 extent_io_tree_init(&fs_info->freed_extents[0], > 2283 extent_io_tree_init(&fs_info->freed_extents[1], > 2289 mutex_init(&fs_info->ordered_operations_mutex); > 2285 fs_info->pinned_extents = &fs_info->freed_extents[0]; > 2289 mutex_init(&fs_info->ordered_operations_mutex); > 2286 fs_info->do_barriers = 1; > 2289 mutex_init(&fs_info->ordered_operations_mutex); > 2290 mutex_init(&fs_info->ordered_extent_flush_mutex); > 2291 mutex_init(&fs_info->tree_log_mutex); > 2292 mutex_init(&fs_info->chunk_mutex); > 2293 mutex_init(&fs_info->transaction_kthread_mutex); > 2294 mutex_init(&fs_info->cleaner_mutex); > 2295 mutex_init(&fs_info->volume_mutex); > 2296 init_rwsem(&fs_info->extent_commit_sem); > 2297 init_rwsem(&fs_info->cleanup_work_sem); > 2298 init_rwsem(&fs_info->subvol_sem); > 2299 sema_init(&fs_info->uuid_tree_rescan_sem, 1); > 2302 mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount); > 2299 sema_init(&fs_info->uuid_tree_rescan_sem, 1); > 2302 mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount); > 2299 sema_init(&fs_info->uuid_tree_rescan_sem, 1); > 2300 fs_info->dev_replace.lock_owner = 0; > 2301 atomic_set(&fs_info->dev_replace.nesting_level, 0); > 2302 mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount); > 2303 mutex_init(&fs_info->dev_replace.lock_management_lock); > 2304 mutex_init(&fs_info->dev_replace.lock); > 2307 mutex_init(&fs_info->qgroup_ioctl_lock); > 2312 fs_info->pending_quota_state = 0; > 2309 INIT_LIST_HEAD(&fs_info->dirty_qgroups); > 2314 mutex_init(&fs_info->qgroup_rescan_lock); > 2308 fs_info->qgroup_tree = RB_ROOT; > 2309 INIT_LIST_HEAD(&fs_info->dirty_qgroups); > 2310 fs_info->qgroup_seq = 1; > 2313 fs_info->qgroup_ulist = NULL; > 2314 mutex_init(&fs_info->qgroup_rescan_lock); > 2316 btrfs_init_free_cluster(&fs_info->meta_alloc_cluster); > 2317 btrfs_init_free_cluster(&fs_info->data_alloc_cluster); > 2319 init_waitqueue_head(&fs_info->transaction_throttle); > 2320 init_waitqueue_head(&fs_info->transaction_wait); > 2321 init_waitqueue_head(&fs_info->transaction_blocked_wait); > 2322 init_waitqueue_head(&fs_info->async_submit_wait); > 2324 ret = btrfs_alloc_stripe_hash_table(fs_info); > 2325 if (ret) { > 2324 ret = btrfs_alloc_stripe_hash_table(fs_info); > 2325 if (ret) { > 2330 __setup_root(4096, 4096, 4096, 4096, tree_root, > 2333 invalidate_bdev(fs_devices->latest_bdev); > 2338 bh = btrfs_read_dev_super(fs_devices->latest_bdev); > 2339 if (!bh) { > 2338 bh = btrfs_read_dev_super(fs_devices->latest_bdev); > 2339 if (!bh) { > 2348 if (btrfs_check_super_csum(bh->b_data)) { > 2359 memcpy(fs_info->super_copy, bh->b_data, sizeof(*fs_info->super_copy)); > 2360 memcpy(fs_info->super_for_commit, fs_info->super_copy, > 2362 brelse(bh); > 2364 memcpy(fs_info->fsid, fs_info->super_copy->fsid, BTRFS_FSID_SIZE); > 2373 disk_super = fs_info->super_copy; > 2374 if (!btrfs_super_root(disk_super)) > 2373 disk_super = fs_info->super_copy; > 2374 if (!btrfs_super_root(disk_super)) > 2378 if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_ERROR) > 2385 generation = btrfs_super_generation(disk_super); > 2386 find_oldest_super_backup(fs_info, generation); > 2385 generation = btrfs_super_generation(disk_super); > 2386 find_oldest_super_backup(fs_info, generation); > 2392 fs_info->compress_type = BTRFS_COMPRESS_ZLIB; > 2394 ret = btrfs_parse_options(tree_root, options); > 2392 fs_info->compress_type = BTRFS_COMPRESS_ZLIB; > 2394 ret = btrfs_parse_options(tree_root, options); > 2395 if (ret) { > 2394 ret = btrfs_parse_options(tree_root, options); > 2395 if (ret) { > 2400 features = btrfs_super_incompat_flags(disk_super) & > 2402 if (features) { > 2410 if (btrfs_super_leafsize(disk_super) !> 2411 btrfs_super_nodesize(disk_super)) { > 2410 if (btrfs_super_leafsize(disk_super) !> 2419 if (btrfs_super_leafsize(disk_super) > BTRFS_MAX_METADATA_BLOCKSIZE) { > 2429 if (tree_root->fs_info->compress_type == BTRFS_COMPRESS_LZO) > 2428 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF; > 2429 if (tree_root->fs_info->compress_type == BTRFS_COMPRESS_LZO) > 2428 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF; > 2432 if (features & BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA) > 2439 if (btrfs_super_leafsize(disk_super) > PAGE_CACHE_SIZE) { > 2445 nodesize = btrfs_super_nodesize(disk_super); > 2447 sectorsize = btrfs_super_sectorsize(disk_super); > 2448 stripesize = btrfs_super_stripesize(disk_super); > 2447 sectorsize = btrfs_super_sectorsize(disk_super); > 2448 stripesize = btrfs_super_stripesize(disk_super); > 2449 fs_info->dirty_metadata_batch = leafsize * (1 + ilog2(nr_cpu_ids)); > 2450 fs_info->delalloc_batch = sectorsize * 512 * (1 + ilog2(nr_cpu_ids)); > 2456 if ((features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) && > 2450 fs_info->delalloc_batch = sectorsize * 512 * (1 + ilog2(nr_cpu_ids)); > 2456 if ((features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) && > 2468 btrfs_set_super_incompat_flags(disk_super, features); > 2472 if (!(sb->s_flags & MS_RDONLY) && features) { > 2470 features = btrfs_super_compat_ro_flags(disk_super) & > 2472 if (!(sb->s_flags & MS_RDONLY) && features) { > 2480 btrfs_init_workers(&fs_info->generic_worker, > 2483 btrfs_init_workers(&fs_info->workers, "worker", > 2487 btrfs_init_workers(&fs_info->delalloc_workers, "delalloc", > 2490 btrfs_init_workers(&fs_info->flush_workers, "flush_delalloc", > 2494 min_t(u64, fs_devices->num_devices, > 2493 btrfs_init_workers(&fs_info->submit_workers, "submit", > 2494 min_t(u64, fs_devices->num_devices, > 2493 btrfs_init_workers(&fs_info->submit_workers, "submit", > 2497 btrfs_init_workers(&fs_info->caching_workers, "cache", > 2512 btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1, > 2504 fs_info->submit_workers.idle_thresh = 64; > 2506 fs_info->workers.idle_thresh = 16; > 2512 btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1, > 2507 fs_info->workers.ordered = 1; > 2512 btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1, > 2509 fs_info->delalloc_workers.idle_thresh = 2; > 2510 fs_info->delalloc_workers.ordered = 1; > 2512 btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1, > 2514 btrfs_init_workers(&fs_info->endio_workers, "endio", > 2517 btrfs_init_workers(&fs_info->endio_meta_workers, "endio-meta", > 2520 btrfs_init_workers(&fs_info->endio_meta_write_workers, > 2523 btrfs_init_workers(&fs_info->endio_raid56_workers, > 2526 btrfs_init_workers(&fs_info->rmw_workers, > 2529 btrfs_init_workers(&fs_info->endio_write_workers, "endio-write", > 2532 btrfs_init_workers(&fs_info->endio_freespace_worker, "freespace-write", > 2534 btrfs_init_workers(&fs_info->delayed_workers, "delayed-meta", > 2537 btrfs_init_workers(&fs_info->readahead_workers, "readahead", > 2540 btrfs_init_workers(&fs_info->qgroup_rescan_workers, "qgroup-rescan", 1, > 2560 ret = btrfs_start_workers(&fs_info->workers); > 2547 fs_info->endio_workers.idle_thresh = 4; > 2548 fs_info->endio_meta_workers.idle_thresh = 4; > 2549 fs_info->endio_raid56_workers.idle_thresh = 4; > 2550 fs_info->rmw_workers.idle_thresh = 2; > 2552 fs_info->endio_write_workers.idle_thresh = 2; > 2553 fs_info->endio_meta_write_workers.idle_thresh = 2; > 2554 fs_info->readahead_workers.idle_thresh = 2; > 2560 ret = btrfs_start_workers(&fs_info->workers); > 2561 ret |= btrfs_start_workers(&fs_info->generic_worker); > 2560 ret = btrfs_start_workers(&fs_info->workers); > 2561 ret |= btrfs_start_workers(&fs_info->generic_worker); > 2562 ret |= btrfs_start_workers(&fs_info->submit_workers); > 2561 ret |= btrfs_start_workers(&fs_info->generic_worker); > 2562 ret |= btrfs_start_workers(&fs_info->submit_workers); > 2561 ret |= btrfs_start_workers(&fs_info->generic_worker); > 2562 ret |= btrfs_start_workers(&fs_info->submit_workers); > 2563 ret |= btrfs_start_workers(&fs_info->delalloc_workers); > 2562 ret |= btrfs_start_workers(&fs_info->submit_workers); > 2563 ret |= btrfs_start_workers(&fs_info->delalloc_workers); > 2564 ret |= btrfs_start_workers(&fs_info->fixup_workers); > 2563 ret |= btrfs_start_workers(&fs_info->delalloc_workers); > 2564 ret |= btrfs_start_workers(&fs_info->fixup_workers); > 2565 ret |= btrfs_start_workers(&fs_info->endio_workers); > 2564 ret |= btrfs_start_workers(&fs_info->fixup_workers); > 2565 ret |= btrfs_start_workers(&fs_info->endio_workers); > 2566 ret |= btrfs_start_workers(&fs_info->endio_meta_workers); > 2565 ret |= btrfs_start_workers(&fs_info->endio_workers); > 2566 ret |= btrfs_start_workers(&fs_info->endio_meta_workers); > 2567 ret |= btrfs_start_workers(&fs_info->rmw_workers); > 2566 ret |= btrfs_start_workers(&fs_info->endio_meta_workers); > 2567 ret |= btrfs_start_workers(&fs_info->rmw_workers); > 2568 ret |= btrfs_start_workers(&fs_info->endio_raid56_workers); > 2567 ret |= btrfs_start_workers(&fs_info->rmw_workers); > 2568 ret |= btrfs_start_workers(&fs_info->endio_raid56_workers); > 2569 ret |= btrfs_start_workers(&fs_info->endio_meta_write_workers); > 2568 ret |= btrfs_start_workers(&fs_info->endio_raid56_workers); > 2569 ret |= btrfs_start_workers(&fs_info->endio_meta_write_workers); > 2570 ret |= btrfs_start_workers(&fs_info->endio_write_workers); > 2569 ret |= btrfs_start_workers(&fs_info->endio_meta_write_workers); > 2570 ret |= btrfs_start_workers(&fs_info->endio_write_workers); > 2571 ret |= btrfs_start_workers(&fs_info->endio_freespace_worker); > 2570 ret |= btrfs_start_workers(&fs_info->endio_write_workers); > 2571 ret |= btrfs_start_workers(&fs_info->endio_freespace_worker); > 2572 ret |= btrfs_start_workers(&fs_info->delayed_workers); > 2571 ret |= btrfs_start_workers(&fs_info->endio_freespace_worker); > 2572 ret |= btrfs_start_workers(&fs_info->delayed_workers); > 2573 ret |= btrfs_start_workers(&fs_info->caching_workers); > 2572 ret |= btrfs_start_workers(&fs_info->delayed_workers); > 2573 ret |= btrfs_start_workers(&fs_info->caching_workers); > 2574 ret |= btrfs_start_workers(&fs_info->readahead_workers); > 2573 ret |= btrfs_start_workers(&fs_info->caching_workers); > 2574 ret |= btrfs_start_workers(&fs_info->readahead_workers); > 2575 ret |= btrfs_start_workers(&fs_info->flush_workers); > 2574 ret |= btrfs_start_workers(&fs_info->readahead_workers); > 2575 ret |= btrfs_start_workers(&fs_info->flush_workers); > 2576 ret |= btrfs_start_workers(&fs_info->qgroup_rescan_workers); > 2575 ret |= btrfs_start_workers(&fs_info->flush_workers); > 2576 ret |= btrfs_start_workers(&fs_info->qgroup_rescan_workers); > 2577 if (ret) { > 2582 fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super); > 2583 fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages, > 2582 fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super); > 2589 tree_root->stripesize = stripesize; > 2583 fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages, > 2586 tree_root->nodesize = nodesize; > 2583 fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages, > 2589 tree_root->stripesize = stripesize; > 2592 sb->s_blocksize_bits = blksize_bits(sectorsize); > 2586 tree_root->nodesize = nodesize; > 2587 tree_root->leafsize = leafsize; > 2588 tree_root->sectorsize = sectorsize; > 2591 sb->s_blocksize = sectorsize; > 2588 tree_root->sectorsize = sectorsize; > 2591 sb->s_blocksize = sectorsize; > 2592 sb->s_blocksize_bits = blksize_bits(sectorsize); > 2594 if (btrfs_super_magic(disk_super) != BTRFS_MAGIC) { > 2592 sb->s_blocksize_bits = blksize_bits(sectorsize); > 2594 if (btrfs_super_magic(disk_super) != BTRFS_MAGIC) { > 2599 if (sectorsize != PAGE_SIZE) { > 2605 mutex_lock(&fs_info->chunk_mutex); > 2606 ret = btrfs_read_sys_array(tree_root); > 2607 mutex_unlock(&fs_info->chunk_mutex); > 2606 ret = btrfs_read_sys_array(tree_root); > 2607 mutex_unlock(&fs_info->chunk_mutex); > 2608 if (ret) { > 2614 blocksize = btrfs_level_size(tree_root, > 2108 struct btrfs_root *tree_root; > 2614 blocksize = btrfs_level_size(tree_root, > 2616 generation = btrfs_super_chunk_root_generation(disk_super); > 2618 __setup_root(nodesize, leafsize, sectorsize, stripesize, > 2616 generation = btrfs_super_chunk_root_generation(disk_super); > 2618 __setup_root(nodesize, leafsize, sectorsize, stripesize, > 2621 chunk_root->node = read_tree_block(chunk_root, > 2624 if (!chunk_root->node || > 2621 chunk_root->node = read_tree_block(chunk_root, > 2624 if (!chunk_root->node || > 2625 !test_bit(EXTENT_BUFFER_UPTODATE, &chunk_root->node->bflags)) { > 2624 if (!chunk_root->node || > 2630 btrfs_set_root_node(&chunk_root->root_item, chunk_root->node); > 2631 chunk_root->commit_root = btrfs_root_node(chunk_root); > 2633 read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid, > 2631 chunk_root->commit_root = btrfs_root_node(chunk_root); > 2633 read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid, > 2636 ret = btrfs_read_chunk_tree(chunk_root); > 2637 if (ret) { > 2647 btrfs_close_extra_devices(fs_info, fs_devices, 0); > 2649 if (!fs_devices->latest_bdev) { > 2666 sb->s_id); > 2996 ret = next_root_backup(fs_info, fs_info->super_copy, > 2666 sb->s_id); > 2656 blocksize = btrfs_level_size(tree_root, > 2108 struct btrfs_root *tree_root; > 2656 blocksize = btrfs_level_size(tree_root, > 2658 generation = btrfs_super_generation(disk_super); > 2660 tree_root->node = read_tree_block(tree_root, > 2663 if (!tree_root->node || > 2660 tree_root->node = read_tree_block(tree_root, > 2663 if (!tree_root->node || > 2664 !test_bit(EXTENT_BUFFER_UPTODATE, &tree_root->node->bflags)) { > 2663 if (!tree_root->node || > 2671 btrfs_set_root_node(&tree_root->root_item, tree_root->node); > 2672 tree_root->commit_root = btrfs_root_node(tree_root); > 2678 extent_root = btrfs_read_tree_root(tree_root, &location); > 2672 tree_root->commit_root = btrfs_root_node(tree_root); > 2678 extent_root = btrfs_read_tree_root(tree_root, &location); > 2674 location.objectid = BTRFS_EXTENT_TREE_OBJECTID; > 2675 location.type = BTRFS_ROOT_ITEM_KEY; > 2676 location.offset = 0; > 2678 extent_root = btrfs_read_tree_root(tree_root, &location); > [ 1.120000] btrfs: mismatching generation and generation_v2 found in root item. This root was probably mounted with an older kernel. Resetting all new fields. > 2679 if (IS_ERR(extent_root)) { > 2678 extent_root = btrfs_read_tree_root(tree_root, &location); > 2679 if (IS_ERR(extent_root)) { > 2687 dev_root = btrfs_read_tree_root(tree_root, &location); > 2683 extent_root->track_dirty = 1; > 2687 dev_root = btrfs_read_tree_root(tree_root, &location); > 2684 fs_info->extent_root = extent_root; > 2686 location.objectid = BTRFS_DEV_TREE_OBJECTID; > 2687 dev_root = btrfs_read_tree_root(tree_root, &location); > 2688 if (IS_ERR(dev_root)) { > 2692 dev_root->track_dirty = 1; > 2694 btrfs_init_devices_late(fs_info); > 2693 fs_info->dev_root = dev_root; > 2694 btrfs_init_devices_late(fs_info); > 2697 csum_root = btrfs_read_tree_root(tree_root, &location); > 2696 location.objectid = BTRFS_CSUM_TREE_OBJECTID; > 2697 csum_root = btrfs_read_tree_root(tree_root, &location); > [ 1.120000] btrfs: mismatching generation and generation_v2 found in root item. This root was probably mounted with an older kernel. Resetting all new fields. > 2698 if (IS_ERR(csum_root)) { > 2706 quota_root = btrfs_read_tree_root(tree_root, &location); > 2702 csum_root->track_dirty = 1; > 2706 quota_root = btrfs_read_tree_root(tree_root, &location); > 2703 fs_info->csum_root = csum_root; > 2705 location.objectid = BTRFS_QUOTA_TREE_OBJECTID; > 2706 quota_root = btrfs_read_tree_root(tree_root, &location); > 2707 if (!IS_ERR(quota_root)) { > 2715 uuid_root = btrfs_read_tree_root(tree_root, &location); > 2714 location.objectid = BTRFS_UUID_TREE_OBJECTID; > 2715 uuid_root = btrfs_read_tree_root(tree_root, &location); > 2716 if (IS_ERR(uuid_root)) { > 2718 if (ret != -ENOENT) > 2721 check_uuid_tree = false; > 2720 create_uuid_tree = true; > 2730 fs_info->generation = generation; > 2731 fs_info->last_trans_committed = generation; > 2733 ret = btrfs_recover_balance(fs_info); > 2734 if (ret) { > 2739 ret = btrfs_init_dev_stats(fs_info); > 2740 if (ret) { > 2746 ret = btrfs_init_dev_replace(fs_info); > 2747 if (ret) { > 2752 btrfs_close_extra_devices(fs_info, fs_devices, 1); > 2754 ret = btrfs_init_space_info(fs_info); > 2755 if (ret) { > 2760 ret = btrfs_read_block_groups(extent_root); > 2761 if (ret) { > 2766 btrfs_calc_num_tolerated_disk_barrier_failures(fs_info); > 2767 if (fs_info->fs_devices->missing_devices > > 2765 fs_info->num_tolerated_disk_barrier_failures > 2767 if (fs_info->fs_devices->missing_devices > > 2775 fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root, > 2780 fs_info->transaction_kthread = kthread_run(transaction_kthread, > 2786 if (!btrfs_test_opt(tree_root, SSD) && > 2788 !fs_info->fs_devices->rotating) { > 2787 !btrfs_test_opt(tree_root, NOSSD) && > 2806 ret = btrfs_read_qgroup_config(fs_info); > 2807 if (ret) > 2811 if (btrfs_super_log_root(disk_super) != 0) { > 2860 ret = btrfs_find_orphan_roots(tree_root); > 2861 if (ret) > 2864 if (!(sb->s_flags & MS_RDONLY)) { > 2882 fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location); > 2878 location.objectid = BTRFS_FS_TREE_OBJECTID; > 2879 location.type = BTRFS_ROOT_ITEM_KEY; > 2880 location.offset = 0; > 2882 fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location); > 2883 if (IS_ERR(fs_info->fs_root)) { > 2882 fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location); > 2884 err = PTR_ERR(fs_info->fs_root); > 2883 if (IS_ERR(fs_info->fs_root)) { > > Error here? > > 2942 btrfs_free_qgroup_config(fs_info); > 2944 kthread_stop(fs_info->transaction_kthread); > 2945 btrfs_cleanup_transaction(fs_info->tree_root); > 2946 del_fs_roots(fs_info); > 2948 kthread_stop(fs_info->cleaner_kthread); > 2954 filemap_write_and_wait(fs_info->btree_inode->i_mapping); > 2957 btrfs_put_block_group_cache(fs_info); > 2958 btrfs_free_block_groups(fs_info); > 2961 free_root_pointers(fs_info, 1); > 2962 invalidate_inode_pages2(fs_info->btree_inode->i_mapping); > 2965 btrfs_stop_all_workers(fs_info); > 2968 btrfs_mapping_tree_free(&fs_info->mapping_tree); > 2970 iput(fs_info->btree_inode); > 2976 bdi_destroy(&fs_info->bdi); > 2978 cleanup_srcu_struct(&fs_info->subvol_srcu); > 2980 btrfs_free_stripe_hash_table(fs_info); > 2981 btrfs_close_devices(fs_info->fs_devices); > 3001 } > btrfs_fill_super (silent=1, data=0x0, fs_devices=<optimized out>, sb=0x61d0e400) at fs/btrfs/super.c:881 > 881 if (err) { > 880 err = open_ctree(sb, fs_devices, (char *)data); > 881 if (err) { > btrfs_mount (fs_type=0x602de120 <btrfs_fs_type>, flags=<optimized out>, device_name=<optimized out>, data=0x0) at fs/btrfs/super.c:1213 > 1213 error = btrfs_fill_super(s, fs_devices, data, > [ 1.120000] btrfs: open_ctree failed > 1218 if (IS_ERR(root)) > 1219 deactivate_locked_super(s); > 1221 return root; > 1219 deactivate_locked_super(s); > 1228 } > mount_fs (type=type@entry=0x602de120 <btrfs_fs_type>, flags=flags@entry=32769, name=name@entry=0x61d0f380 "/dev/root", data=data@entry=0x0) at fs/super.c:1136 > > If you need more, please ask. > > Sincerely > Philipp > -- > / / (_)__ __ ____ __ Philipp Hahn > / /__/ / _ \/ // /\ \/ / > /____/_/_//_/\_,_/ /_/\_\ pmhahn@pmhahn.de > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html-- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
David Sterba
2013-Dec-16 13:46 UTC
Re: [BUG] open_ctree() failes after mounting BTRFS with 3.2 after 3.12
On Sun, Dec 15, 2013 at 10:03:35PM +0800, Shilong Wang wrote:> I compile btrfs in kernel 3.2 and 3.12. > > # mkfs.btrfs -f /dev/sda2 > # mount /dev/sda2 /mnt > # dd if=/dev/zero of=/mnt/data bs=1M count=1024 > # umount /mnt > > The above operations is in 3.2 > > and then i switch my system into 3.12, and try to mount /dev/sda2 > it will output something like the following: > > btrfs: mismatching generation and generation_v2 found in root item. > This root was probably mounted with an older kernel. Resetting all new > fields. > > But it mounted successfully, then i do some similar operations in > 3.12...and umount it. > and switch into kernel version 3.2... > > but i failt to mount it in 3.2 and it output the following message. > > BTRFS: couldn''t mount because of unsupported optional features (20)BTRFS_FEATURE_INCOMPAT_BIG_METADATA (1ULL << 5) == 0x20 so you''ve made the filesystem with new progs that turn on bigblocks by default.> It seems that here the problem is because incompat features in newer > kernel and make older kernel > unmountable any more..This is not the case for any incompat feature introduced after 3.2. Default subolume, lzo compression are automatically set when the feature is used, but nothing from the rest like bigblocks, extrefs, skinny metadata etc. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html