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2015-11-11btrfs: scrub: setup all fields for sblock_to_checkZhao Lei1-0/+12
scrub_setup_recheck_block() isn't setup all necessary fields for sblock_to_check because history reason. So current code need more arguments in severial functions, and more local variables, just to passing these lacked values to necessary place. This patch setup above fields to sblock_to_check in scrub_setup_recheck_block(), for: 1: more cleanup for function arg, local variable 2: to make sblock_to_check complete, then we can use sblock_to_check without concern about some uninitialized member. Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-11-11btrfs: scrub: set error stats when tree block spanning stripesZhao Lei1-0/+6
It is better to show error stats to user when we found tree block spanning stripes. On a btrfs created by old version of btrfs-convert: Before patch: # btrfs scrub start -B /dev/vdh scrub done for 8b342d35-2904-41ab-b3cb-2f929709cf47 scrub started at Tue Aug 25 21:19:09 2015 and finished after 00:00:00 total bytes scrubbed: 53.54MiB with 0 errors # dmesg ... [ 128.711434] BTRFS error (device vdh): scrub: tree block 27054080 spanning stripes, ignored. logical=27000832 [ 128.712744] BTRFS error (device vdh): scrub: tree block 27054080 spanning stripes, ignored. logical=27066368 ... After patch: # btrfs scrub start -B /dev/vdh scrub done for ff7f844b-7a4e-4b1a-88a9-8252ab25be1b scrub started at Tue Aug 25 21:42:29 2015 and finished after 00:00:00 total bytes scrubbed: 53.60MiB with 2 errors error details: corrected errors: 0, uncorrectable errors: 2, unverified errors: 0 ERROR: There are uncorrectable errors. # dmesg ...omit... # Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-11-09Btrfs: fix race when listing an inode's xattrsFilipe Manana1-1/+3
When listing a inode's xattrs we have a time window where we race against a concurrent operation for adding a new hard link for our inode that makes us not return any xattr to user space. In order for this to happen, the first xattr of our inode needs to be at slot 0 of a leaf and the previous leaf must still have room for an inode ref (or extref) item, and this can happen because an inode's listxattrs callback does not lock the inode's i_mutex (nor does the VFS does it for us), but adding a hard link to an inode makes the VFS lock the inode's i_mutex before calling the inode's link callback. If we have the following leafs: Leaf X (has N items) Leaf Y [ ... (257 INODE_ITEM 0) (257 INODE_REF 256) ] [ (257 XATTR_ITEM 12345), ... ] slot N - 2 slot N - 1 slot 0 The race illustrated by the following sequence diagram is possible: CPU 1 CPU 2 btrfs_listxattr() searches for key (257 XATTR_ITEM 0) gets path with path->nodes[0] == leaf X and path->slots[0] == N because path->slots[0] is >= btrfs_header_nritems(leaf X), it calls btrfs_next_leaf() btrfs_next_leaf() releases the path adds key (257 INODE_REF 666) to the end of leaf X (slot N), and leaf X now has N + 1 items searches for the key (257 INODE_REF 256), with path->keep_locks == 1, because that is the last key it saw in leaf X before releasing the path ends up at leaf X again and it verifies that the key (257 INODE_REF 256) is no longer the last key in leaf X, so it returns with path->nodes[0] == leaf X and path->slots[0] == N, pointing to the new item with key (257 INODE_REF 666) btrfs_listxattr's loop iteration sees that the type of the key pointed by the path is different from the type BTRFS_XATTR_ITEM_KEY and so it breaks the loop and stops looking for more xattr items --> the application doesn't get any xattr listed for our inode So fix this by breaking the loop only if the key's type is greater than BTRFS_XATTR_ITEM_KEY and skip the current key if its type is smaller. Cc: stable@vger.kernel.org Signed-off-by: Filipe Manana <fdmanana@suse.com>
2015-11-09Btrfs: fix race leading to BUG_ON when running delalloc for nodatacowFilipe Manana1-2/+8
If we are using the NO_HOLES feature, we have a tiny time window when running delalloc for a nodatacow inode where we can race with a concurrent link or xattr add operation leading to a BUG_ON. This happens because at run_delalloc_nocow() we end up casting a leaf item of type BTRFS_INODE_[REF|EXTREF]_KEY or of type BTRFS_XATTR_ITEM_KEY to a file extent item (struct btrfs_file_extent_item) and then analyse its extent type field, which won't match any of the expected extent types (values BTRFS_FILE_EXTENT_[REG|PREALLOC|INLINE]) and therefore trigger an explicit BUG_ON(1). The following sequence diagram shows how the race happens when running a no-cow dellaloc range [4K, 8K[ for inode 257 and we have the following neighbour leafs: Leaf X (has N items) Leaf Y [ ... (257 INODE_ITEM 0) (257 INODE_REF 256) ] [ (257 EXTENT_DATA 8192), ... ] slot N - 2 slot N - 1 slot 0 (Note the implicit hole for inode 257 regarding the [0, 8K[ range) CPU 1 CPU 2 run_dealloc_nocow() btrfs_lookup_file_extent() --> searches for a key with value (257 EXTENT_DATA 4096) in the fs/subvol tree --> returns us a path with path->nodes[0] == leaf X and path->slots[0] == N because path->slots[0] is >= btrfs_header_nritems(leaf X), it calls btrfs_next_leaf() btrfs_next_leaf() --> releases the path hard link added to our inode, with key (257 INODE_REF 500) added to the end of leaf X, so leaf X now has N + 1 keys --> searches for the key (257 INODE_REF 256), because it was the last key in leaf X before it released the path, with path->keep_locks set to 1 --> ends up at leaf X again and it verifies that the key (257 INODE_REF 256) is no longer the last key in the leaf, so it returns with path->nodes[0] == leaf X and path->slots[0] == N, pointing to the new item with key (257 INODE_REF 500) the loop iteration of run_dealloc_nocow() does not break out the loop and continues because the key referenced in the path at path->nodes[0] and path->slots[0] is for inode 257, its type is < BTRFS_EXTENT_DATA_KEY and its offset (500) is less then our delalloc range's end (8192) the item pointed by the path, an inode reference item, is (incorrectly) interpreted as a file extent item and we get an invalid extent type, leading to the BUG_ON(1): if (extent_type == BTRFS_FILE_EXTENT_REG || extent_type == BTRFS_FILE_EXTENT_PREALLOC) { (...) } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { (...) } else { BUG_ON(1) } The same can happen if a xattr is added concurrently and ends up having a key with an offset smaller then the delalloc's range end. So fix this by skipping keys with a type smaller than BTRFS_EXTENT_DATA_KEY. Cc: stable@vger.kernel.org Signed-off-by: Filipe Manana <fdmanana@suse.com>
2015-11-08Btrfs: fix race leading to incorrect item deletion when dropping extentsFilipe Manana1-4/+12
While running a stress test I got the following warning triggered: [191627.672810] ------------[ cut here ]------------ [191627.673949] WARNING: CPU: 8 PID: 8447 at fs/btrfs/file.c:779 __btrfs_drop_extents+0x391/0xa50 [btrfs]() (...) [191627.701485] Call Trace: [191627.702037] [<ffffffff8145f077>] dump_stack+0x4f/0x7b [191627.702992] [<ffffffff81095de5>] ? console_unlock+0x356/0x3a2 [191627.704091] [<ffffffff8104b3b0>] warn_slowpath_common+0xa1/0xbb [191627.705380] [<ffffffffa0664499>] ? __btrfs_drop_extents+0x391/0xa50 [btrfs] [191627.706637] [<ffffffff8104b46d>] warn_slowpath_null+0x1a/0x1c [191627.707789] [<ffffffffa0664499>] __btrfs_drop_extents+0x391/0xa50 [btrfs] [191627.709155] [<ffffffff8115663c>] ? cache_alloc_debugcheck_after.isra.32+0x171/0x1d0 [191627.712444] [<ffffffff81155007>] ? kmemleak_alloc_recursive.constprop.40+0x16/0x18 [191627.714162] [<ffffffffa06570c9>] insert_reserved_file_extent.constprop.40+0x83/0x24e [btrfs] [191627.715887] [<ffffffffa065422b>] ? start_transaction+0x3bb/0x610 [btrfs] [191627.717287] [<ffffffffa065b604>] btrfs_finish_ordered_io+0x273/0x4e2 [btrfs] [191627.728865] [<ffffffffa065b888>] finish_ordered_fn+0x15/0x17 [btrfs] [191627.730045] [<ffffffffa067d688>] normal_work_helper+0x14c/0x32c [btrfs] [191627.731256] [<ffffffffa067d96a>] btrfs_endio_write_helper+0x12/0x14 [btrfs] [191627.732661] [<ffffffff81061119>] process_one_work+0x24c/0x4ae [191627.733822] [<ffffffff810615b0>] worker_thread+0x206/0x2c2 [191627.734857] [<ffffffff810613aa>] ? process_scheduled_works+0x2f/0x2f [191627.736052] [<ffffffff810613aa>] ? process_scheduled_works+0x2f/0x2f [191627.737349] [<ffffffff810669a6>] kthread+0xef/0xf7 [191627.738267] [<ffffffff810f3b3a>] ? time_hardirqs_on+0x15/0x28 [191627.739330] [<ffffffff810668b7>] ? __kthread_parkme+0xad/0xad [191627.741976] [<ffffffff81465592>] ret_from_fork+0x42/0x70 [191627.743080] [<ffffffff810668b7>] ? __kthread_parkme+0xad/0xad [191627.744206] ---[ end trace bbfddacb7aaada8d ]--- $ cat -n fs/btrfs/file.c 691 int __btrfs_drop_extents(struct btrfs_trans_handle *trans, (...) 758 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 759 if (key.objectid > ino || 760 key.type > BTRFS_EXTENT_DATA_KEY || key.offset >= end) 761 break; 762 763 fi = btrfs_item_ptr(leaf, path->slots[0], 764 struct btrfs_file_extent_item); 765 extent_type = btrfs_file_extent_type(leaf, fi); 766 767 if (extent_type == BTRFS_FILE_EXTENT_REG || 768 extent_type == BTRFS_FILE_EXTENT_PREALLOC) { (...) 774 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { (...) 778 } else { 779 WARN_ON(1); 780 extent_end = search_start; 781 } (...) This happened because the item we were processing did not match a file extent item (its key type != BTRFS_EXTENT_DATA_KEY), and even on this case we cast the item to a struct btrfs_file_extent_item pointer and then find a type field value that does not match any of the expected values (BTRFS_FILE_EXTENT_[REG|PREALLOC|INLINE]). This scenario happens due to a tiny time window where a race can happen as exemplified below. For example, consider the following scenario where we're using the NO_HOLES feature and we have the following two neighbour leafs: Leaf X (has N items) Leaf Y [ ... (257 INODE_ITEM 0) (257 INODE_REF 256) ] [ (257 EXTENT_DATA 8192), ... ] slot N - 2 slot N - 1 slot 0 Our inode 257 has an implicit hole in the range [0, 8K[ (implicit rather than explicit because NO_HOLES is enabled). Now if our inode has an ordered extent for the range [4K, 8K[ that is finishing, the following can happen: CPU 1 CPU 2 btrfs_finish_ordered_io() insert_reserved_file_extent() __btrfs_drop_extents() Searches for the key (257 EXTENT_DATA 4096) through btrfs_lookup_file_extent() Key not found and we get a path where path->nodes[0] == leaf X and path->slots[0] == N Because path->slots[0] is >= btrfs_header_nritems(leaf X), we call btrfs_next_leaf() btrfs_next_leaf() releases the path inserts key (257 INODE_REF 4096) at the end of leaf X, leaf X now has N + 1 keys, and the new key is at slot N btrfs_next_leaf() searches for key (257 INODE_REF 256), with path->keep_locks set to 1, because it was the last key it saw in leaf X finds it in leaf X again and notices it's no longer the last key of the leaf, so it returns 0 with path->nodes[0] == leaf X and path->slots[0] == N (which is now < btrfs_header_nritems(leaf X)), pointing to the new key (257 INODE_REF 4096) __btrfs_drop_extents() casts the item at path->nodes[0], slot path->slots[0], to a struct btrfs_file_extent_item - it does not skip keys for the target inode with a type less than BTRFS_EXTENT_DATA_KEY (BTRFS_INODE_REF_KEY < BTRFS_EXTENT_DATA_KEY) sees a bogus value for the type field triggering the WARN_ON in the trace shown above, and sets extent_end = search_start (4096) does the if-then-else logic to fixup 0 length extent items created by a past bug from hole punching: if (extent_end == key.offset && extent_end >= search_start) goto delete_extent_item; that evaluates to true and it ends up deleting the key pointed to by path->slots[0], (257 INODE_REF 4096), from leaf X The same could happen for example for a xattr that ends up having a key with an offset value that matches search_start (very unlikely but not impossible). So fix this by ensuring that keys smaller than BTRFS_EXTENT_DATA_KEY are skipped, never casted to struct btrfs_file_extent_item and never deleted by accident. Also protect against the unexpected case of getting a key for a lower inode number by skipping that key and issuing a warning. Cc: stable@vger.kernel.org Signed-off-by: Filipe Manana <fdmanana@suse.com>
2015-11-05Btrfs: fix sleeping inside atomic context in qgroup rescan workerFilipe Manana1-1/+0
We are holding a btree path with spinning locks and then we attempt to clone an extent buffer, which calls kmem_cache_alloc() and this function can sleep, causing the following trace to be reported on a debug kernel: [107118.218536] BUG: sleeping function called from invalid context at mm/slab.c:2871 [107118.224110] in_atomic(): 1, irqs_disabled(): 0, pid: 19148, name: kworker/u32:3 [107118.226120] INFO: lockdep is turned off. [107118.226843] Preemption disabled at:[<ffffffffa05ffa22>] btrfs_clear_lock_blocking_rw+0x96/0xea [btrfs] [107118.229175] CPU: 3 PID: 19148 Comm: kworker/u32:3 Tainted: G W 4.3.0-rc5-btrfs-next-17+ #1 [107118.231326] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.1-0-g4adadbd-20150316_085822-nilsson.home.kraxel.org 04/01/2014 [107118.233687] Workqueue: btrfs-qgroup-rescan btrfs_qgroup_rescan_helper [btrfs] [107118.236835] 0000000000000000 ffff880424bf3b78 ffffffff812566f4 0000000000000000 [107118.238369] ffff880424bf3ba0 ffffffff81070664 ffffffff817f1cd5 0000000000000b37 [107118.239769] 0000000000000000 ffff880424bf3bc8 ffffffff8107070a 0000000000008850 [107118.241244] Call Trace: [107118.241729] [<ffffffff812566f4>] dump_stack+0x4e/0x79 [107118.242602] [<ffffffff81070664>] ___might_sleep+0x23a/0x241 [107118.243586] [<ffffffff8107070a>] __might_sleep+0x9f/0xa6 [107118.244532] [<ffffffff8115af70>] cache_alloc_debugcheck_before+0x25/0x36 [107118.245939] [<ffffffff8115d52b>] kmem_cache_alloc+0x50/0x215 [107118.246930] [<ffffffffa05e627e>] __alloc_extent_buffer+0x2a/0x11f [btrfs] [107118.248121] [<ffffffffa05ecb1a>] btrfs_clone_extent_buffer+0x3d/0xdd [btrfs] [107118.249451] [<ffffffffa06239ea>] btrfs_qgroup_rescan_worker+0x16d/0x434 [btrfs] [107118.250755] [<ffffffff81087481>] ? arch_local_irq_save+0x9/0xc [107118.251754] [<ffffffffa05f7952>] normal_work_helper+0x14c/0x32a [btrfs] [107118.252899] [<ffffffffa05f7952>] ? normal_work_helper+0x14c/0x32a [btrfs] [107118.254195] [<ffffffffa05f7c82>] btrfs_qgroup_rescan_helper+0x12/0x14 [btrfs] [107118.255436] [<ffffffff81063b23>] process_one_work+0x24a/0x4ac [107118.263690] [<ffffffff81064285>] worker_thread+0x206/0x2c2 [107118.264888] [<ffffffff8106407f>] ? rescuer_thread+0x2cb/0x2cb [107118.267413] [<ffffffff8106904d>] kthread+0xef/0xf7 [107118.268417] [<ffffffff81068f5e>] ? kthread_parkme+0x24/0x24 [107118.269505] [<ffffffff8147d10f>] ret_from_fork+0x3f/0x70 [107118.270491] [<ffffffff81068f5e>] ? kthread_parkme+0x24/0x24 So just use blocking locks for our path to solve this. This fixes the patch titled: "btrfs: qgroup: Don't copy extent buffer to do qgroup rescan" Signed-off-by: Filipe Manana <fdmanana@suse.com>
2015-11-05Btrfs: fix race waiting for qgroup rescan workerFilipe Manana1-2/+1
We were initializing the completion (fs_info->qgroup_rescan_completion) object after releasing the qgroup rescan lock, which gives a small time window for a rescan waiter to not actually wait for the rescan worker to finish. Example: CPU 1 CPU 2 fs_info->qgroup_rescan_completion->done is 0 btrfs_qgroup_rescan_worker() complete_all(&fs_info->qgroup_rescan_completion) sets fs_info->qgroup_rescan_completion->done to UINT_MAX / 2 ... do some other stuff .... qgroup_rescan_init() mutex_lock(&fs_info->qgroup_rescan_lock) set flag BTRFS_QGROUP_STATUS_FLAG_RESCAN in fs_info->qgroup_flags mutex_unlock(&fs_info->qgroup_rescan_lock) btrfs_qgroup_wait_for_completion() mutex_lock(&fs_info->qgroup_rescan_lock) sees flag BTRFS_QGROUP_STATUS_FLAG_RESCAN in fs_info->qgroup_flags mutex_unlock(&fs_info->qgroup_rescan_lock) wait_for_completion_interruptible( &fs_info->qgroup_rescan_completion) fs_info->qgroup_rescan_completion->done is > 0 so it returns immediately init_completion(&fs_info->qgroup_rescan_completion) sets fs_info->qgroup_rescan_completion->done to 0 So fix this by initializing the completion object while holding the mutex fs_info->qgroup_rescan_lock. Signed-off-by: Filipe Manana <fdmanana@suse.com>
2015-11-05btrfs: qgroup: exit the rescan worker during umountJustin Maggard2-3/+9
I was hitting a consistent NULL pointer dereference during shutdown that showed the trace running through end_workqueue_bio(). I traced it back to the endio_meta_workers workqueue being poked after it had already been destroyed. Eventually I found that the root cause was a qgroup rescan that was still in progress while we were stopping all the btrfs workers. Currently we explicitly pause balance and scrub operations in close_ctree(), but we do nothing to stop the qgroup rescan. We should probably be doing the same for qgroup rescan, but that's a much larger change. This small change is good enough to allow me to unmount without crashing. Signed-off-by: Justin Maggard <jmaggard@netgear.com> Reviewed-by: Filipe Manana <fdmanana@suse.com>
2015-11-05Btrfs: fix extent accounting for partial direct IO writesFilipe Manana1-15/+37
When doing a write using direct IO we can end up not doing the whole write operation using the direct IO path, in that case we fallback to a buffered write to do the remaining IO. This happens for example if the range we are writing to contains a compressed extent. When we do a partial write and fallback to buffered IO, due to the existence of a compressed extent for example, we end up not adjusting the outstanding extents counter of our inode which ends up getting decremented twice, once by the DIO ordered extent for the partial write and once again by btrfs_direct_IO(), resulting in an arithmetic underflow at extent-tree.c:drop_outstanding_extent(). For example if we have: extents [ prealloc extent ] [ compressed extent ] offsets A B C D E and at the moment our inode's outstanding extents counter is 0, if we do a direct IO write against the range [B, D[ (which has a length smaller than 128Mb), we end up bumping our inode's outstanding extents counter to 1, we create a DIO ordered extent for the range [B, C[ and then fallback to a buffered write for the range [C, D[. The direct IO handler (inode.c:btrfs_direct_IO()) decrements the outstanding extents counter by 1, leaving it with a value of 0, through a call to btrfs_delalloc_release_space() and then shortly after the DIO ordered extent finishes and calls btrfs_delalloc_release_metadata() which ends up to attempt to decrement the inode's outstanding extents counter by 1, resulting in an assertion failure at drop_outstanding_extent() because the operation would result in an arithmetic underflow (0 - 1). This produces the following trace: [125471.336838] BTRFS: assertion failed: BTRFS_I(inode)->outstanding_extents >= num_extents, file: fs/btrfs/extent-tree.c, line: 5526 [125471.338844] ------------[ cut here ]------------ [125471.340745] kernel BUG at fs/btrfs/ctree.h:4173! [125471.340745] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC [125471.340745] Modules linked in: btrfs f2fs xfs libcrc32c dm_flakey dm_mod crc32c_generic xor raid6_pq nfsd auth_rpcgss oid_registry nfs_acl nfs lockd grace fscache sunrpc loop fuse parport_pc acpi_cpufreq psmouse i2c_piix4 parport pcspkr serio_raw microcode processor evdev i2c_core button ext4 crc16 jbd2 mbcache sd_mod sg sr_mod cdrom ata_generic virtio_scsi ata_piix virtio_pci virtio_ring floppy libata virtio e1000 scsi_mod [last unloaded: btrfs] [125471.340745] CPU: 10 PID: 23649 Comm: kworker/u32:1 Tainted: G W 4.3.0-rc5-btrfs-next-17+ #1 [125471.340745] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.1-0-g4adadbd-20150316_085822-nilsson.home.kraxel.org 04/01/2014 [125471.340745] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs] [125471.340745] task: ffff8804244fcf80 ti: ffff88040a118000 task.ti: ffff88040a118000 [125471.340745] RIP: 0010:[<ffffffffa0550da1>] [<ffffffffa0550da1>] assfail.constprop.46+0x1e/0x20 [btrfs] [125471.340745] RSP: 0018:ffff88040a11bc78 EFLAGS: 00010296 [125471.340745] RAX: 0000000000000075 RBX: 0000000000005000 RCX: 0000000000000000 [125471.340745] RDX: ffffffff81098f93 RSI: ffffffff8147c619 RDI: 00000000ffffffff [125471.340745] RBP: ffff88040a11bc78 R08: 0000000000000001 R09: 0000000000000000 [125471.340745] R10: ffff88040a11bc08 R11: ffffffff81651000 R12: ffff8803efb4a000 [125471.340745] R13: ffff8803efb4a000 R14: 0000000000000000 R15: ffff8802f8e33c88 [125471.340745] FS: 0000000000000000(0000) GS:ffff88043dd40000(0000) knlGS:0000000000000000 [125471.340745] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [125471.340745] CR2: 00007fae7ca86095 CR3: 0000000001a0b000 CR4: 00000000000006e0 [125471.340745] Stack: [125471.340745] ffff88040a11bc88 ffffffffa04ca0cd ffff88040a11bcc8 ffffffffa04ceeb1 [125471.340745] ffff8802f8e33940 ffff8802c93eadb0 ffff8802f8e0bf50 ffff8803efb4a000 [125471.340745] 0000000000000000 ffff8802f8e33c88 ffff88040a11bd38 ffffffffa04eccfa [125471.340745] Call Trace: [125471.340745] [<ffffffffa04ca0cd>] drop_outstanding_extent+0x3d/0x6d [btrfs] [125471.340745] [<ffffffffa04ceeb1>] btrfs_delalloc_release_metadata+0x51/0xdd [btrfs] [125471.340745] [<ffffffffa04eccfa>] btrfs_finish_ordered_io+0x420/0x4eb [btrfs] [125471.340745] [<ffffffffa04ecdda>] finish_ordered_fn+0x15/0x17 [btrfs] [125471.340745] [<ffffffffa050e6e8>] normal_work_helper+0x14c/0x32a [btrfs] [125471.340745] [<ffffffffa050e9c8>] btrfs_endio_write_helper+0x12/0x14 [btrfs] [125471.340745] [<ffffffff81063b23>] process_one_work+0x24a/0x4ac [125471.340745] [<ffffffff81064285>] worker_thread+0x206/0x2c2 [125471.340745] [<ffffffff8106407f>] ? rescuer_thread+0x2cb/0x2cb [125471.340745] [<ffffffff8106407f>] ? rescuer_thread+0x2cb/0x2cb [125471.340745] [<ffffffff8106904d>] kthread+0xef/0xf7 [125471.340745] [<ffffffff81068f5e>] ? kthread_parkme+0x24/0x24 [125471.340745] [<ffffffff8147d10f>] ret_from_fork+0x3f/0x70 [125471.340745] [<ffffffff81068f5e>] ? kthread_parkme+0x24/0x24 [125471.340745] Code: a5 55 a0 48 89 e5 e8 42 50 bc e0 0f 0b 55 89 f1 48 c7 c2 f0 a8 55 a0 48 89 fe 31 c0 48 c7 c7 14 aa 55 a0 48 89 e5 e8 22 50 bc e0 <0f> 0b 0f 1f 44 00 00 55 31 c9 ba 18 00 00 00 48 89 e5 41 56 41 [125471.340745] RIP [<ffffffffa0550da1>] assfail.constprop.46+0x1e/0x20 [btrfs] [125471.340745] RSP <ffff88040a11bc78> [125471.539620] ---[ end trace 144259f7838b4aa4 ]--- So fix this by ensuring we adjust the outstanding extents counter when we do the fallback just like we do for the case where the whole write can be done through the direct IO path. We were also adjusting the outstanding extents counter by a constant value of 1, which is incorrect because we were ignorning that we account extents in BTRFS_MAX_EXTENT_SIZE units, o fix that as well. The following test case for fstests reproduces this issue: seq=`basename $0` seqres=$RESULT_DIR/$seq echo "QA output created by $seq" tmp=/tmp/$$ status=1 # failure is the default! trap "_cleanup; exit \$status" 0 1 2 3 15 _cleanup() { rm -f $tmp.* } # get standard environment, filters and checks . ./common/rc . ./common/filter # real QA test starts here _need_to_be_root _supported_fs btrfs _supported_os Linux _require_scratch _require_xfs_io_command "falloc" rm -f $seqres.full _scratch_mkfs >>$seqres.full 2>&1 _scratch_mount "-o compress" # Create a compressed extent covering the range [700K, 800K[. $XFS_IO_PROG -f -s -c "pwrite -S 0xaa -b 100K 700K 100K" \ $SCRATCH_MNT/foo | _filter_xfs_io # Create prealloc extent covering the range [600K, 700K[. $XFS_IO_PROG -c "falloc 600K 100K" $SCRATCH_MNT/foo # Write 80K of data to the range [640K, 720K[ using direct IO. This # range covers both the prealloc extent and the compressed extent. # Because there's a compressed extent in the range we are writing to, # the DIO write code path ends up only writing the first 60k of data, # which goes to the prealloc extent, and then falls back to buffered IO # for writing the remaining 20K of data - because that remaining data # maps to a file range containing a compressed extent. # When falling back to buffered IO, we used to trigger an assertion when # releasing reserved space due to bad accounting of the inode's # outstanding extents counter, which was set to 1 but we ended up # decrementing it by 1 twice, once through the ordered extent for the # 60K of data we wrote using direct IO, and once through the main direct # IO handler (inode.cbtrfs_direct_IO()) because the direct IO write # wrote less than 80K of data (60K). $XFS_IO_PROG -d -c "pwrite -S 0xbb -b 80K 640K 80K" \ $SCRATCH_MNT/foo | _filter_xfs_io # Now similar test as above but for very large write operations. This # triggers special cases for an inode's outstanding extents accounting, # as internally btrfs logically splits extents into 128Mb units. $XFS_IO_PROG -f -s \ -c "pwrite -S 0xaa -b 128M 258M 128M" \ -c "falloc 0 258M" \ $SCRATCH_MNT/bar | _filter_xfs_io $XFS_IO_PROG -d -c "pwrite -S 0xbb -b 256M 3M 256M" $SCRATCH_MNT/bar \ | _filter_xfs_io # Now verify the file contents are correct and that they are the same # even after unmounting and mounting the fs again (or evicting the page # cache). # # For file foo, all bytes in the range [0, 640K[ must have a value of # 0x00, all bytes in the range [640K, 720K[ must have a value of 0xbb # and all bytes in the range [720K, 800K[ must have a value of 0xaa. # # For file bar, all bytes in the range [0, 3M[ must havea value of 0x00, # all bytes in the range [3M, 259M[ must have a value of 0xbb and all # bytes in the range [259M, 386M[ must have a value of 0xaa. # echo "File digests before remounting the file system:" md5sum $SCRATCH_MNT/foo | _filter_scratch md5sum $SCRATCH_MNT/bar | _filter_scratch _scratch_remount echo "File digests after remounting the file system:" md5sum $SCRATCH_MNT/foo | _filter_scratch md5sum $SCRATCH_MNT/bar | _filter_scratch status=0 exit Fixes: e1cbbfa5f5aa ("Btrfs: fix outstanding_extents accounting in DIO") Fixes: 3e05bde8c3c2 ("Btrfs: only adjust outstanding_extents when we do a short write") Signed-off-by: Filipe Manana <fdmanana@suse.com>
2015-11-03Btrfs: fix hole punching when using the no-holes featureFilipe Manana1-0/+13
When we are using the no-holes feature, if we punch a hole into a file range that already contains a hole which overlaps the range we are passing to fallocate(), we end up removing the extent map that represents the existing hole without adding a new one. This happens because with the no-holes feature we do not have explicit extent items to represent holes and therefore the call to __btrfs_drop_extents(), made from btrfs_punch_hole(), returns an end offset to the variable drop_end that is smaller than the end of the range passed to fallocate(), while it drops all existing extent maps in that range. Normally having a missing extent map is not a problem, for example for a readpages() operation we just end up building the extent map by looking at the fs/subvol tree for a matching extent item (or a lack of one for implicit holes). However for an fsync that uses the fast path, which needs to look at the list of modified extent maps, this means the fsync will not record information about the complete hole we had before the fallocate() call into the log tree, resulting in a file with content/layout that does not match what we had neither before nor after the hole punch operation. The following test case for fstests reproduces the issue. It fails without this change because we get a file with a different digest after the fsync log replay and also with a different extent/hole layout. seq=`basename $0` seqres=$RESULT_DIR/$seq echo "QA output created by $seq" tmp=/tmp/$$ status=1 # failure is the default! trap "_cleanup; exit \$status" 0 1 2 3 15 _cleanup() { _cleanup_flakey rm -f $tmp.* } # get standard environment, filters and checks . ./common/rc . ./common/filter . ./common/punch . ./common/dmflakey # real QA test starts here _need_to_be_root _supported_fs generic _supported_os Linux _require_scratch _require_xfs_io_command "fpunch" _require_xfs_io_command "fiemap" _require_dm_target flakey _require_metadata_journaling $SCRATCH_DEV # This test was motivated by an issue found in btrfs when the btrfs # no-holes feature is enabled (introduced in kernel 3.14). So enable # the feature if the fs being tested is btrfs. if [ $FSTYP == "btrfs" ]; then _require_btrfs_fs_feature "no_holes" _require_btrfs_mkfs_feature "no-holes" MKFS_OPTIONS="$MKFS_OPTIONS -O no-holes" fi rm -f $seqres.full _scratch_mkfs >>$seqres.full 2>&1 _init_flakey _mount_flakey # Create out test file with some data and then fsync it. # We do the fsync only to make sure the last fsync we do in this test # triggers the fast code path of btrfs' fsync implementation, a # condition necessary to trigger the bug btrfs had. $XFS_IO_PROG -f -c "pwrite -S 0xaa 0K 128K" \ -c "fsync" \ $SCRATCH_MNT/foobar | _filter_xfs_io # Now punch a hole against the range [96K, 128K[. $XFS_IO_PROG -c "fpunch 96K 32K" $SCRATCH_MNT/foobar # Punch another hole against a range that overlaps the previous range # and ends beyond eof. $XFS_IO_PROG -c "fpunch 64K 128K" $SCRATCH_MNT/foobar # Punch another hole against a range that overlaps the first range # ([96K, 128K[) and ends at eof. $XFS_IO_PROG -c "fpunch 32K 96K" $SCRATCH_MNT/foobar # Fsync our file. We want to verify that, after a power failure and # mounting the filesystem again, the file content reflects all the hole # punch operations. $XFS_IO_PROG -c "fsync" $SCRATCH_MNT/foobar echo "File digest before power failure:" md5sum $SCRATCH_MNT/foobar | _filter_scratch echo "Fiemap before power failure:" $XFS_IO_PROG -c "fiemap -v" $SCRATCH_MNT/foobar | _filter_fiemap # Silently drop all writes and umount to simulate a crash/power failure. _load_flakey_table $FLAKEY_DROP_WRITES _unmount_flakey # Allow writes again, mount to trigger log replay and validate file # contents. _load_flakey_table $FLAKEY_ALLOW_WRITES _mount_flakey echo "File digest after log replay:" # Must match the same digest we got before the power failure. md5sum $SCRATCH_MNT/foobar | _filter_scratch echo "Fiemap after log replay:" # Must match the same extent listing we got before the power failure. $XFS_IO_PROG -c "fiemap -v" $SCRATCH_MNT/foobar | _filter_fiemap _unmount_flakey status=0 exit Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-11-03Btrfs: find_free_extent: Do not erroneously skip LOOP_CACHING_WAIT statechandan1-1/+6
When executing generic/001 in a loop on a ppc64 machine (with both sectorsize and nodesize set to 64k), the following call trace is observed, WARNING: at /root/repos/linux/fs/btrfs/locking.c:253 Modules linked in: CPU: 2 PID: 8353 Comm: umount Not tainted 4.3.0-rc5-13676-ga5e681d #54 task: c0000000f2b1f560 ti: c0000000f6008000 task.ti: c0000000f6008000 NIP: c000000000520c88 LR: c0000000004a3b34 CTR: 0000000000000000 REGS: c0000000f600a820 TRAP: 0700 Not tainted (4.3.0-rc5-13676-ga5e681d) MSR: 8000000102029032 <SF,VEC,EE,ME,IR,DR,RI> CR: 24444884 XER: 00000000 CFAR: c0000000004a3b30 SOFTE: 1 GPR00: c0000000004a3b34 c0000000f600aaa0 c00000000108ac00 c0000000f5a808c0 GPR04: 0000000000000000 c0000000f600ae60 0000000000000000 0000000000000005 GPR08: 00000000000020a1 0000000000000001 c0000000f2b1f560 0000000000000030 GPR12: 0000000084842882 c00000000fdc0900 c0000000f600ae60 c0000000f070b800 GPR16: 0000000000000000 c0000000f3c8a000 0000000000000000 0000000000000049 GPR20: 0000000000000001 0000000000000001 c0000000f5aa01f8 0000000000000000 GPR24: 0f83e0f83e0f83e1 c0000000f5a808c0 c0000000f3c8d000 c000000000000000 GPR28: c0000000f600ae74 0000000000000001 c0000000f3c8d000 c0000000f5a808c0 NIP [c000000000520c88] .btrfs_tree_lock+0x48/0x2a0 LR [c0000000004a3b34] .btrfs_lock_root_node+0x44/0x80 Call Trace: [c0000000f600aaa0] [c0000000f600ab80] 0xc0000000f600ab80 (unreliable) [c0000000f600ab80] [c0000000004a3b34] .btrfs_lock_root_node+0x44/0x80 [c0000000f600ac00] [c0000000004a99dc] .btrfs_search_slot+0xa8c/0xc00 [c0000000f600ad40] [c0000000004ab878] .btrfs_insert_empty_items+0x98/0x120 [c0000000f600adf0] [c00000000050da44] .btrfs_finish_chunk_alloc+0x1d4/0x620 [c0000000f600af20] [c0000000004be854] .btrfs_create_pending_block_groups+0x1d4/0x2c0 [c0000000f600b020] [c0000000004bf188] .do_chunk_alloc+0x3c8/0x420 [c0000000f600b100] [c0000000004c27cc] .find_free_extent+0xbfc/0x1030 [c0000000f600b260] [c0000000004c2ce8] .btrfs_reserve_extent+0xe8/0x250 [c0000000f600b330] [c0000000004c2f90] .btrfs_alloc_tree_block+0x140/0x590 [c0000000f600b440] [c0000000004a47b4] .__btrfs_cow_block+0x124/0x780 [c0000000f600b530] [c0000000004a4fc0] .btrfs_cow_block+0xf0/0x250 [c0000000f600b5e0] [c0000000004a917c] .btrfs_search_slot+0x22c/0xc00 [c0000000f600b720] [c00000000050aa40] .btrfs_remove_chunk+0x1b0/0x9f0 [c0000000f600b850] [c0000000004c4e04] .btrfs_delete_unused_bgs+0x434/0x570 [c0000000f600b950] [c0000000004d3cb8] .close_ctree+0x2e8/0x3b0 [c0000000f600ba20] [c00000000049d178] .btrfs_put_super+0x18/0x30 [c0000000f600ba90] [c000000000243cd4] .generic_shutdown_super+0xa4/0x1a0 [c0000000f600bb10] [c0000000002441d8] .kill_anon_super+0x18/0x30 [c0000000f600bb90] [c00000000049c898] .btrfs_kill_super+0x18/0xc0 [c0000000f600bc10] [c0000000002444f8] .deactivate_locked_super+0x98/0xe0 [c0000000f600bc90] [c000000000269f94] .cleanup_mnt+0x54/0xa0 [c0000000f600bd10] [c0000000000bd744] .task_work_run+0xc4/0x100 [c0000000f600bdb0] [c000000000016334] .do_notify_resume+0x74/0x80 [c0000000f600be30] [c0000000000098b8] .ret_from_except_lite+0x64/0x68 Instruction dump: fba1ffe8 fbc1fff0 fbe1fff8 7c791b78 f8010010 f821ff21 e94d0290 81030040 812a04e8 7d094a78 7d290034 5529d97e <0b090000> 3b400000 3be30050 3bc3004c The above call trace is seen even on x86_64; albeit very rarely and that too with nodesize set to 64k and with nospace_cache mount option being used. The reason for the above call trace is, btrfs_remove_chunk check_system_chunk Allocate chunk if required For each physical stripe on underlying device, btrfs_free_dev_extent ... Take lock on Device tree's root node btrfs_cow_block("dev tree's root node"); btrfs_reserve_extent find_free_extent index = BTRFS_RAID_DUP; have_caching_bg = false; When in LOOP_CACHING_NOWAIT state, Assume we find a block group which is being cached; Hence have_caching_bg is set to true When repeating the search for the next RAID index, we set have_caching_bg to false. Hence right after completing the LOOP_CACHING_NOWAIT state, we incorrectly skip LOOP_CACHING_WAIT state and move to LOOP_ALLOC_CHUNK state where we allocate a chunk and try to add entries corresponding to the chunk's physical stripe into the device tree. When doing so the task deadlocks itself waiting for the blocking lock on the root node of the device tree. This commit fixes the issue by introducing a new local variable to help indicate as to whether a block group of any RAID type is being cached. Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com> Reviewed-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-11-03btrfs: Fix a data space underflow warningQu Wenruo1-3/+8
Even with quota disabled, generic/127 will trigger a kernel warning by underflow data space info. The bug is caused by buffered write, which in case of short copy, the start parameter for btrfs_delalloc_release_space() is wrong, and round_up/down() in btrfs_delalloc_release() extents the range to page aligned, decreasing one more page than expected. This patch will fix it by passing correct start. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-27btrfs: qgroup: Fix a rebase bug which will cause qgroup double freeQu Wenruo1-4/+0
When rebasing my patchset, I forgot to pick up a cleanup patch to remove old hotfix in 4.2 release. Witouth the cleanup, it will screw up new qgroup reserve framework and always cause minus reserved number. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-27btrfs: qgroup: Fix a race in delayed_ref which leads to abort transQu Wenruo5-21/+32
Between btrfs_allocerved_file_extent() and btrfs_add_delayed_qgroup_reserve(), there is a window that delayed_refs are run and delayed ref head maybe freed before btrfs_add_delayed_qgroup_reserve(). This will cause btrfs_dad_delayed_qgroup_reserve() to return -ENOENT, and cause transaction to be aborted. This patch will record qgroup reserve space info into delayed_ref_head at btrfs_add_delayed_ref(), to eliminate the race window. Reported-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-27btrfs: clear PF_NOFREEZE in cleaner_kthread()Jiri Kosina1-0/+1
cleaner_kthread() kthread calls try_to_freeze() at the beginning of every cleanup attempt. This operation can't ever succeed though, as the kthread hasn't marked itself as freezable. Before (hopefully eventually) kthread freezing gets converted to fileystem freezing, we'd rather mark cleaner_kthread() freezable (as my understanding is that it can generate filesystem I/O during suspend). Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-27btrfs: qgroup: Don't copy extent buffer to do qgroup rescanQu Wenruo1-10/+16
Ancient qgroup code call memcpy() on a extent buffer and use it for leaf iteration. As extent buffer contains lock, pointers to pages, it's never sane to do such copy. The following bug may be caused by this insane operation: [92098.841309] general protection fault: 0000 [#1] SMP [92098.841338] Modules linked in: ... [92098.841814] CPU: 1 PID: 24655 Comm: kworker/u4:12 Not tainted 4.3.0-rc1 #1 [92098.841868] Workqueue: btrfs-qgroup-rescan btrfs_qgroup_rescan_helper [btrfs] [92098.842261] Call Trace: [92098.842277] [<ffffffffc035a5d8>] ? read_extent_buffer+0xb8/0x110 [btrfs] [92098.842304] [<ffffffffc0396d00>] ? btrfs_find_all_roots+0x60/0x70 [btrfs] [92098.842329] [<ffffffffc039af3d>] btrfs_qgroup_rescan_worker+0x28d/0x5a0 [btrfs] Where btrfs_qgroup_rescan_worker+0x28d is btrfs_disk_key_to_cpu(), called in reading key from the copied extent_buffer. This patch will use btrfs_clone_extent_buffer() to a better copy of extent buffer to deal such case. Reported-by: Stephane Lesimple <stephane_btrfs@lesimple.fr> Suggested-by: Filipe Manana <fdmanana@kernel.org> Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-27btrfs: add balance filters limits, stripes and usage to supported maskDavid Sterba1-1/+4
Enable the extended 'limit' syntax (a range), the new 'stripes' and extended 'usage' syntax (a range) filters in the filters mask. The patch comes separate and not within the series that introduced the new filters because the patch adding the mask was merged in a late rc. The integration branch was based on an older rc and could not merge the patch due to the missing changes. Prerequisities: * btrfs: check unsupported filters in balance arguments * btrfs: extend balance filter limit to take minimum and maximum * btrfs: add balance filter for stripes * btrfs: extend balance filter usage to take minimum and maximum Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-27btrfs: extend balance filter usage to take minimum and maximumDavid Sterba4-4/+60
Similar to the 'limit' filter, we can enhance the 'usage' filter to accept a range. The change is backward compatible, the range is applied only in connection with the BTRFS_BALANCE_ARGS_USAGE_RANGE flag. We don't have a usecase yet, the current syntax has been sufficient. The enhancement should provide parity with other range-like filters. Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-27btrfs: add balance filter for stripesGabríel Arthúr Pétursson4-2/+37
Balance block groups which have the given number of stripes, defined by a range min..max. This is useful to selectively rebalance only chunks that do not span enough devices, applies to RAID0/10/5/6. Signed-off-by: Gabríel Arthúr Pétursson <gabriel@system.is> [ renamed bargs members, added to the UAPI, wrote the changelog ] Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-27btrfs: extend balance filter limit to take minimum and maximumDavid Sterba4-3/+67
The 'limit' filter is underdesigned, it should have been a range for [min,max], with some relaxed semantics when one of the bounds is missing. Besides that, using a full u64 for a single value is a waste of bytes. Let's fix both by extending the use of the u64 bytes for the [min,max] range. This can be done in a backward compatible way, the range will be interpreted only if the appropriate flag is set (BTRFS_BALANCE_ARGS_LIMIT_RANGE). Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-27btrfs: fix use after free iterating extrefsChris Mason1-5/+3
The code for btrfs inode-resolve has never worked properly for files with enough hard links to trigger extrefs. It was trying to get the leaf out of a path after freeing the path: btrfs_release_path(path); leaf = path->nodes[0]; item_size = btrfs_item_size_nr(leaf, slot); The fix here is to use the extent buffer we cloned just a little higher up to avoid deadlocks caused by using the leaf in the path. Signed-off-by: Chris Mason <clm@fb.com> cc: stable@vger.kernel.org # v3.7+ cc: Mark Fasheh <mfasheh@suse.de> Reviewed-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: Mark Fasheh <mfasheh@suse.de> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-27btrfs: check unsupported filters in balance argumentsDavid Sterba2-0/+13
We don't verify that all the balance filter arguments supplemented by the flags are actually known to the kernel. Thus we let it silently pass and do nothing. At the moment this means only the 'limit' filter, but we're going to add a few more soon so it's better to have that fixed. Also in older stable kernels so that it works with newer userspace tools. Cc: stable@vger.kernel.org # 3.16+ Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-25Btrfs: fix regression running delayed references when using qgroupsFilipe Manana9-134/+44
In the kernel 4.2 merge window we had a big changes to the implementation of delayed references and qgroups which made the no_quota field of delayed references not used anymore. More specifically the no_quota field is not used anymore as of: commit 0ed4792af0e8 ("btrfs: qgroup: Switch to new extent-oriented qgroup mechanism.") Leaving the no_quota field actually prevents delayed references from getting merged, which in turn cause the following BUG_ON(), at fs/btrfs/extent-tree.c, to be hit when qgroups are enabled: static int run_delayed_tree_ref(...) { (...) BUG_ON(node->ref_mod != 1); (...) } This happens on a scenario like the following: 1) Ref1 bytenr X, action = BTRFS_ADD_DELAYED_REF, no_quota = 1, added. 2) Ref2 bytenr X, action = BTRFS_DROP_DELAYED_REF, no_quota = 0, added. It's not merged with Ref1 because Ref1->no_quota != Ref2->no_quota. 3) Ref3 bytenr X, action = BTRFS_ADD_DELAYED_REF, no_quota = 1, added. It's not merged with the reference at the tail of the list of refs for bytenr X because the reference at the tail, Ref2 is incompatible due to Ref2->no_quota != Ref3->no_quota. 4) Ref4 bytenr X, action = BTRFS_DROP_DELAYED_REF, no_quota = 0, added. It's not merged with the reference at the tail of the list of refs for bytenr X because the reference at the tail, Ref3 is incompatible due to Ref3->no_quota != Ref4->no_quota. 5) We run delayed references, trigger merging of delayed references, through __btrfs_run_delayed_refs() -> btrfs_merge_delayed_refs(). 6) Ref1 and Ref3 are merged as Ref1->no_quota = Ref3->no_quota and all other conditions are satisfied too. So Ref1 gets a ref_mod value of 2. 7) Ref2 and Ref4 are merged as Ref2->no_quota = Ref4->no_quota and all other conditions are satisfied too. So Ref2 gets a ref_mod value of 2. 8) Ref1 and Ref2 aren't merged, because they have different values for their no_quota field. 9) Delayed reference Ref1 is picked for running (select_delayed_ref() always prefers references with an action == BTRFS_ADD_DELAYED_REF). So run_delayed_tree_ref() is called for Ref1 which triggers the BUG_ON because Ref1->red_mod != 1 (equals 2). So fix this by removing the no_quota field, as it's not used anymore as of commit 0ed4792af0e8 ("btrfs: qgroup: Switch to new extent-oriented qgroup mechanism."). The use of no_quota was also buggy in at least two places: 1) At delayed-refs.c:btrfs_add_delayed_tree_ref() - we were setting no_quota to 0 instead of 1 when the following condition was true: is_fstree(ref_root) || !fs_info->quota_enabled 2) At extent-tree.c:__btrfs_inc_extent_ref() - we were attempting to reset a node's no_quota when the condition "!is_fstree(root_objectid) || !root->fs_info->quota_enabled" was true but we did it only in an unused local stack variable, that is, we never reset the no_quota value in the node itself. This fixes the remainder of problems several people have been having when running delayed references, mostly while a balance is running in parallel, on a 4.2+ kernel. Very special thanks to Stéphane Lesimple for helping debugging this issue and testing this fix on his multi terabyte filesystem (which took more than one day to balance alone, plus fsck, etc). Also, this fixes deadlock issue when using the clone ioctl with qgroups enabled, as reported by Elias Probst in the mailing list. The deadlock happens because after calling btrfs_insert_empty_item we have our path holding a write lock on a leaf of the fs/subvol tree and then before releasing the path we called check_ref() which did backref walking, when qgroups are enabled, and tried to read lock the same leaf. The trace for this case is the following: INFO: task systemd-nspawn:6095 blocked for more than 120 seconds. (...) Call Trace: [<ffffffff86999201>] schedule+0x74/0x83 [<ffffffff863ef64c>] btrfs_tree_read_lock+0xc0/0xea [<ffffffff86137ed7>] ? wait_woken+0x74/0x74 [<ffffffff8639f0a7>] btrfs_search_old_slot+0x51a/0x810 [<ffffffff863a129b>] btrfs_next_old_leaf+0xdf/0x3ce [<ffffffff86413a00>] ? ulist_add_merge+0x1b/0x127 [<ffffffff86411688>] __resolve_indirect_refs+0x62a/0x667 [<ffffffff863ef546>] ? btrfs_clear_lock_blocking_rw+0x78/0xbe [<ffffffff864122d3>] find_parent_nodes+0xaf3/0xfc6 [<ffffffff86412838>] __btrfs_find_all_roots+0x92/0xf0 [<ffffffff864128f2>] btrfs_find_all_roots+0x45/0x65 [<ffffffff8639a75b>] ? btrfs_get_tree_mod_seq+0x2b/0x88 [<ffffffff863e852e>] check_ref+0x64/0xc4 [<ffffffff863e9e01>] btrfs_clone+0x66e/0xb5d [<ffffffff863ea77f>] btrfs_ioctl_clone+0x48f/0x5bb [<ffffffff86048a68>] ? native_sched_clock+0x28/0x77 [<ffffffff863ed9b0>] btrfs_ioctl+0xabc/0x25cb (...) The problem goes away by eleminating check_ref(), which no longer is needed as its purpose was to get a value for the no_quota field of a delayed reference (this patch removes the no_quota field as mentioned earlier). Reported-by: Stéphane Lesimple <stephane_btrfs@lesimple.fr> Tested-by: Stéphane Lesimple <stephane_btrfs@lesimple.fr> Reported-by: Elias Probst <mail@eliasprobst.eu> Reported-by: Peter Becker <floyd.net@gmail.com> Reported-by: Malte Schröder <malte@tnxip.de> Reported-by: Derek Dongray <derek@valedon.co.uk> Reported-by: Erkki Seppala <flux-btrfs@inside.org> Cc: stable@vger.kernel.org # 4.2+ Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
2015-10-25Btrfs: fix regression when running delayed referencesFilipe Manana2-0/+127
In the kernel 4.2 merge window we had a refactoring/rework of the delayed references implementation in order to fix certain problems with qgroups. However that rework introduced one more regression that leads to the following trace when running delayed references for metadata: [35908.064664] kernel BUG at fs/btrfs/extent-tree.c:1832! [35908.065201] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC [35908.065201] Modules linked in: dm_flakey dm_mod btrfs crc32c_generic xor raid6_pq nfsd auth_rpcgss oid_registry nfs_acl nfs lockd grace fscache sunrpc loop fuse parport_pc psmouse i2 [35908.065201] CPU: 14 PID: 15014 Comm: kworker/u32:9 Tainted: G W 4.3.0-rc5-btrfs-next-17+ #1 [35908.065201] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.1-0-g4adadbd-20150316_085822-nilsson.home.kraxel.org 04/01/2014 [35908.065201] Workqueue: btrfs-extent-refs btrfs_extent_refs_helper [btrfs] [35908.065201] task: ffff880114b7d780 ti: ffff88010c4c8000 task.ti: ffff88010c4c8000 [35908.065201] RIP: 0010:[<ffffffffa04928b5>] [<ffffffffa04928b5>] insert_inline_extent_backref+0x52/0xb1 [btrfs] [35908.065201] RSP: 0018:ffff88010c4cbb08 EFLAGS: 00010293 [35908.065201] RAX: 0000000000000000 RBX: ffff88008a661000 RCX: 0000000000000000 [35908.065201] RDX: ffffffffa04dd58f RSI: 0000000000000001 RDI: 0000000000000000 [35908.065201] RBP: ffff88010c4cbb40 R08: 0000000000001000 R09: ffff88010c4cb9f8 [35908.065201] R10: 0000000000000000 R11: 000000000000002c R12: 0000000000000000 [35908.065201] R13: ffff88020a74c578 R14: 0000000000000000 R15: 0000000000000000 [35908.065201] FS: 0000000000000000(0000) GS:ffff88023edc0000(0000) knlGS:0000000000000000 [35908.065201] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [35908.065201] CR2: 00000000015e8708 CR3: 0000000102185000 CR4: 00000000000006e0 [35908.065201] Stack: [35908.065201] ffff88010c4cbb18 0000000000000f37 ffff88020a74c578 ffff88015a408000 [35908.065201] ffff880154a44000 0000000000000000 0000000000000005 ffff88010c4cbbd8 [35908.065201] ffffffffa0492b9a 0000000000000005 0000000000000000 0000000000000000 [35908.065201] Call Trace: [35908.065201] [<ffffffffa0492b9a>] __btrfs_inc_extent_ref+0x8b/0x208 [btrfs] [35908.065201] [<ffffffffa0497117>] ? __btrfs_run_delayed_refs+0x4d4/0xd33 [btrfs] [35908.065201] [<ffffffffa049773d>] __btrfs_run_delayed_refs+0xafa/0xd33 [btrfs] [35908.065201] [<ffffffffa04a976a>] ? join_transaction.isra.10+0x25/0x41f [btrfs] [35908.065201] [<ffffffffa04a97ed>] ? join_transaction.isra.10+0xa8/0x41f [btrfs] [35908.065201] [<ffffffffa049914d>] btrfs_run_delayed_refs+0x75/0x1dd [btrfs] [35908.065201] [<ffffffffa04992f1>] delayed_ref_async_start+0x3c/0x7b [btrfs] [35908.065201] [<ffffffffa04d4b4f>] normal_work_helper+0x14c/0x32a [btrfs] [35908.065201] [<ffffffffa04d4e93>] btrfs_extent_refs_helper+0x12/0x14 [btrfs] [35908.065201] [<ffffffff81063b23>] process_one_work+0x24a/0x4ac [35908.065201] [<ffffffff81064285>] worker_thread+0x206/0x2c2 [35908.065201] [<ffffffff8106407f>] ? rescuer_thread+0x2cb/0x2cb [35908.065201] [<ffffffff8106407f>] ? rescuer_thread+0x2cb/0x2cb [35908.065201] [<ffffffff8106904d>] kthread+0xef/0xf7 [35908.065201] [<ffffffff81068f5e>] ? kthread_parkme+0x24/0x24 [35908.065201] [<ffffffff8147d10f>] ret_from_fork+0x3f/0x70 [35908.065201] [<ffffffff81068f5e>] ? kthread_parkme+0x24/0x24 [35908.065201] Code: 6a 01 41 56 41 54 ff 75 10 41 51 4d 89 c1 49 89 c8 48 8d 4d d0 e8 f6 f1 ff ff 48 83 c4 28 85 c0 75 2c 49 81 fc ff 00 00 00 77 02 <0f> 0b 4c 8b 45 30 8b 4d 28 45 31 [35908.065201] RIP [<ffffffffa04928b5>] insert_inline_extent_backref+0x52/0xb1 [btrfs] [35908.065201] RSP <ffff88010c4cbb08> [35908.310885] ---[ end trace fe4299baf0666457 ]--- This happens because the new delayed references code no longer merges delayed references that have different sequence values. The following steps are an example sequence leading to this issue: 1) Transaction N starts, fs_info->tree_mod_seq has value 0; 2) Extent buffer (btree node) A is allocated, delayed reference Ref1 for bytenr A is created, with a value of 1 and a seq value of 0; 3) fs_info->tree_mod_seq is incremented to 1; 4) Extent buffer A is deleted through btrfs_del_items(), which calls btrfs_del_leaf(), which in turn calls btrfs_free_tree_block(). The later returns the metadata extent associated to extent buffer A to the free space cache (the range is not pinned), because the extent buffer was created in the current transaction (N) and writeback never happened for the extent buffer (flag BTRFS_HEADER_FLAG_WRITTEN not set in the extent buffer). This creates the delayed reference Ref2 for bytenr A, with a value of -1 and a seq value of 1; 5) Delayed reference Ref2 is not merged with Ref1 when we create it, because they have different sequence numbers (decided at add_delayed_ref_tail_merge()); 6) fs_info->tree_mod_seq is incremented to 2; 7) Some task attempts to allocate a new extent buffer (done at extent-tree.c:find_free_extent()), but due to heavy fragmentation and running low on metadata space the clustered allocation fails and we fall back to unclustered allocation, which finds the extent at offset A, so a new extent buffer at offset A is allocated. This creates delayed reference Ref3 for bytenr A, with a value of 1 and a seq value of 2; 8) Ref3 is not merged neither with Ref2 nor Ref1, again because they all have different seq values; 9) We start running the delayed references (__btrfs_run_delayed_refs()); 10) The delayed Ref1 is the first one being applied, which ends up creating an inline extent backref in the extent tree; 10) Next the delayed reference Ref3 is selected for execution, and not Ref2, because select_delayed_ref() always gives a preference for positive references (that have an action of BTRFS_ADD_DELAYED_REF); 11) When running Ref3 we encounter alreay the inline extent backref in the extent tree at insert_inline_extent_backref(), which makes us hit the following BUG_ON: BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID); This is always true because owner corresponds to the level of the extent buffer/btree node in the btree. For the scenario described above we hit the BUG_ON because we never merge references that have different seq values. We used to do the merging before the 4.2 kernel, more specifically, before the commmits: c6fc24549960 ("btrfs: delayed-ref: Use list to replace the ref_root in ref_head.") c43d160fcd5e ("btrfs: delayed-ref: Cleanup the unneeded functions.") This issue became more exposed after the following change that was added to 4.2 as well: cffc3374e567 ("Btrfs: fix order by which delayed references are run") Which in turn fixed another regression by the two commits previously mentioned. So fix this by bringing back the delayed reference merge code, with the proper adaptations so that it operates against the new data structure (linked list vs old red black tree implementation). This issue was hit running fstest btrfs/063 in a loop. Several people have reported this issue in the mailing list when running on kernels 4.2+. Very special thanks to Stéphane Lesimple for helping debugging this issue and testing this fix on his multi terabyte filesystem (which took more than one day to balance alone, plus fsck, etc). Fixes: c6fc24549960 ("btrfs: delayed-ref: Use list to replace the ref_root in ref_head.") Reported-by: Peter Becker <floyd.net@gmail.com> Reported-by: Stéphane Lesimple <stephane_btrfs@lesimple.fr> Tested-by: Stéphane Lesimple <stephane_btrfs@lesimple.fr> Reported-by: Malte Schröder <malte@tnxip.de> Reported-by: Derek Dongray <derek@valedon.co.uk> Reported-by: Erkki Seppala <flux-btrfs@inside.org> Cc: stable@vger.kernel.org # 4.2+ Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
2015-10-22Btrfs: don't do extra bitmap search in one bit caseJosef Bacik1-13/+15
When we make ctl->unit allocations from a bitmap there is no point in searching for the next 0 in the bitmap. If we've found a bit we're done and can just exit the loop. Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22Btrfs: keep track of largest extent in bitmapsJosef Bacik2-1/+39
We can waste a lot of time searching through bitmaps when we are heavily fragmented trying to find large contiguous areas that don't exist in the bitmap. So keep track of the max extent size when we do a full search of a bitmap so that next time around we can just skip the expensive searching if our max size is less than what we are looking for. Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22Btrfs: don't keep trying to build clusters if we are fragmentedJosef Bacik3-24/+82
If we are extremely fragmented then we won't be able to create a free_cluster. So if this happens set last_ptr->fragmented so that all future allcations will give up trying to create a cluster. When we unpin extents we will unset ->fragmented if we free up a sufficient amount of space in a block group. Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22Btrfs: cut down on loops through the allocatorJosef Bacik1-3/+36
We try really really hard to make allocations, but sometimes it is just not going to happen, especially when free space is extremely fragmented. So add a few short cuts through the looping states. For example if we couldn't allocate a chunk, just go straight to the NO_EMPTY_SIZE loop. If there are no uncached block groups and we've done a full search, go straight to the ALLOC_CHUNK stage. And finally if we already have empty_size and empty_cluster set to 0 go ahead and return -ENOSPC. Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22Btrfs: don't continue setting up space cache when enospcJosef Bacik2-0/+20
If we hit ENOSPC when setting up a space cache don't bother setting up any of the other space cache's in this transaction, it'll just induce unnecessary latency. Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22Btrfs: keep track of max_extent_size per space_infoJosef Bacik2-1/+34
When we are heavily fragmented we can induce a lot of latency trying to make an allocation happen that is simply not going to happen. Thankfully we keep track of our max_extent_size when going through the allocator, so if we get to the point where we are exiting find_free_extent with ENOSPC then set our space_info->max_extent_size so we can keep future allocations from having to pay this cost. We reset the max_extent_size whenever we release pinned bytes back into this space info so we can redo all the work. Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22Btrfs: don't loop in allocator for space cacheJosef Bacik1-1/+1
The space cache needs to have contiguous allocations, and the allocator tries to make allocations by reducing the amount of bytes requested and re-searching. But this just makes us waste time when we are very fragmented, so if we can't find our space just exit, don't bother trying to search again. Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22Btrfs: add a flags field to btrfs_transactionJosef Bacik4-18/+16
I want to set some per transaction flags, so instead of adding yet another int lets just convert the current two int indicators to flags and add a flags field for future use. Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22Btrfs: fix prealloc under heavy fragmentation conditionsJosef Bacik1-0/+9
If we are heavily fragmented we will continually try to prealloc the largest extent size we can every time we call btrfs_reserve_extent. This can be very expensive when we are heavily fragmented, burning lots of CPU cycles and loops through the allocator. So instead notice when we get a smaller chunk from the allocator than what we specified and use this as the new maximum size we try to allocate. Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22Btrfs: add fragment=* debug mount optionJosef Bacik5-7/+150
In tracking down these weird bitmap problems it was helpful to artificially create an extremely fragmented file system. These mount options let us either fragment data or metadata or both. With these options I could reproduce all sorts of weird latencies and hangs that occur under extreme fragmentation and get them fixed. Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22Btrfs: fix qgroup sanity testsJosef Bacik1-0/+6
With my changes to allow us to find old roots when resolving indirect refs I introduced a regression to the sanity tests. Since we don't really care to go down into the fs roots we just need to have the old behavior of returning ENOENT for dummy roots for the sanity tests. In the future if we want to get fancy we can populate the test fs trees with the references as well. Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22Btrfs: change how we wait for pending ordered extentsJosef Bacik5-64/+60
We have a mechanism to make sure we don't lose updates for ordered extents that were logged in the transaction that is currently running. We add the ordered extent to a transaction list and then the transaction waits on all the ordered extents in that list. However are substantially large file systems this list can be extremely large, and can give us soft lockups, since the ordered extents don't remove themselves from the list when they do complete. To fix this we simply add a counter to the transaction that is incremented any time we have a logged extent that needs to be completed in the current transaction. Then when the ordered extent finally completes it decrements the per transaction counter and wakes up the transaction if we are the last ones. This will eliminate the softlockup. Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22btrfs: qgroup: Check if qgroup reserved space leakedQu Wenruo3-0/+34
Add check at btrfs_destroy_inode() time to detect qgroup reserved space leak. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22btrfs: qgroup: Avoid calling btrfs_free_reserved_data_space in clear_bit_hookQu Wenruo3-12/+22
In clear_bit_hook, qgroup reserved data is already handled quite well, either released by finish_ordered_io or invalidatepage. So calling btrfs_qgroup_free_data() here is completely meaningless, and since btrfs_qgroup_free_data() will lock io_tree, so it can't be called with io_tree lock hold. This patch will add a new function btrfs_free_reserved_data_space_noquota() for clear_bit_hook() to cease the lockdep warning. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22btrfs: fallocate: Add support to accurate qgroup reserveQu Wenruo1-44/+117
Now fallocate will do accurate qgroup reserve space check, unlike old method, which will always reserve the whole length of the range. With this patch, fallocate will: 1) Iterate the desired range and mark in data rsv map Only range which is going to be allocated will be recorded in data rsv map and reserve the space. For already allocated range (normal/prealloc extent) they will be skipped. Also, record the marked range into a new list for later use. 2) If 1) succeeded, do real file extent allocate. And at file extent allocation time, corresponding range will be removed from the range in data rsv map. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22btrfs: qgroup: Add new trace point for qgroup data reserveQu Wenruo3-2/+130
Now each qgroup reserve for data will has its ftrace event for better debugging. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22btrfs: Add handler for invalidate pageQu Wenruo1-0/+24
For btrfs_invalidatepage() and its variant evict_inode_truncate_page(), there will be pages don't reach disk. In that case, their reserved space won't be release nor freed by finish_ordered_io() nor delayed_ref handler. So we must free their qgroup reserved space, or we will leaking reserved space again. So this will patch will call btrfs_qgroup_free_data() for invalidatepage() and its variant evict_inode_truncate_page(). And due to the nature of new btrfs_qgroup_reserve/free_data() reserved space will only be reserved or freed once, so for pages which are already flushed to disk, their reserved space will be released and freed by delayed_ref handler. Double free won't be a problem. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22btrfs: qgroup: Add handler for NOCOW and inlineQu Wenruo2-1/+21
For NOCOW and inline case, there will be no delayed_ref created for them, so we should free their reserved data space at proper time(finish_ordered_io for NOCOW and cow_file_inline for inline). Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22btrfs: qgroup: Cleanup old inaccurate facilitiesQu Wenruo9-156/+60
Cleanup the old facilities which use old btrfs_qgroup_reserve() function call, replace them with the newer version, and remove the "__" prefix in them. Also, make btrfs_qgroup_reserve/free() functions private, as they are now only used inside qgroup codes. Now, the whole btrfs qgroup is swithed to use the new reserve facilities. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22btrfs: extent-tree: Switch to new delalloc space reserve and releaseQu Wenruo4-25/+38
Use new __btrfs_delalloc_reserve_space() and __btrfs_delalloc_release_space() to reserve and release space for delalloc. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22btrfs: extent-tree: Add new version of btrfs_delalloc_reserve/release_spaceQu Wenruo2-0/+61
Add new version of btrfs_delalloc_reserve_space() and btrfs_delalloc_release_space() functions, which supports accurate qgroup reserve. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22btrfs: extent-tree: Switch to new check_data_free_space and ↵Qu Wenruo3-19/+27
free_reserved_data_space Use new reserve/free for buffered write and inode cache. For buffered write case, as nodatacow write won't increase quota account, so unlike old behavior which does reserve before check nocow, now we check nocow first and then only reserve data if we can't do nocow write. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22btrfs: extent-tree: Add new version of btrfs_check_data_free_space and ↵Qu Wenruo2-9/+79
btrfs_free_reserved_data_space. Add new functions __btrfs_check_data_free_space() and __btrfs_free_reserved_data_space() to work with new accurate qgroup reserved space framework. The new function will replace old btrfs_check_data_free_space() and btrfs_free_reserved_data_space() respectively, but until all the change is done, let's just use the new name. Also, export internal use function btrfs_alloc_data_chunk_ondemand(), as now qgroup reserve requires precious bytes, some operation can't get the accurate number in advance(like fallocate). But data space info check and data chunk allocate doesn't need to be that accurate, and can be called at the beginning. So export it for later operations. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22btrfs: qgroup: Use new metadata reservation.Qu Wenruo3-36/+13
As we have the new metadata reservation functions, use them to replace the old btrfs_qgroup_reserve() call for metadata. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22btrfs: qgroup: Introduce new functions to reserve/free metadataQu Wenruo4-0/+48
Introduce new functions btrfs_qgroup_reserve/free_meta() to reserve/free metadata reserved space. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-10-22btrfs: delayed_ref: release and free qgroup reserved at proper timingQu Wenruo4-4/+34
Qgroup reserved space needs to be released from inode dirty map and get freed at different timing: 1) Release when the metadata is written into tree After corresponding metadata is written into tree, any newer write will be COWed(don't include NOCOW case yet). So we must release its range from inode dirty range map, or we will forget to reserve needed range, causing accounting exceeding the limit. 2) Free reserved bytes when delayed ref is run When delayed refs are run, qgroup accounting will follow soon and turn the reserved bytes into rfer/excl numbers. As run_delayed_refs and qgroup accounting are all done at commit_transaction() time, we are safe to free reserved space in run_delayed_ref time(). With these timing to release/free reserved space, we should be able to resolve the long existing qgroup reserve space leak problem. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
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