- 11 May, 2015 4 commits
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Filipe Manana authored
There's a race between releasing extent buffers that are flagged as stale and recycling them that makes us it the following BUG_ON at btrfs_release_extent_buffer_page: BUG_ON(extent_buffer_under_io(eb)) The BUG_ON is triggered because the extent buffer has the flag EXTENT_BUFFER_DIRTY set as a consequence of having been reused and made dirty by another concurrent task. Here follows a sequence of steps that leads to the BUG_ON. CPU 0 CPU 1 CPU 2 path->nodes[0] == eb X X->refs == 2 (1 for the tree, 1 for the path) btrfs_header_generation(X) == current trans id flag EXTENT_BUFFER_DIRTY set on X btrfs_release_path(path) unlocks X reads eb X X->refs incremented to 3 locks eb X btrfs_del_items(X) X becomes empty clean_tree_block(X) clear EXTENT_BUFFER_DIRTY from X btrfs_del_leaf(X) unlocks X extent_buffer_get(X) X->refs incremented to 4 btrfs_free_tree_block(X) X's range is not pinned X's range added to free space cache free_extent_buffer_stale(X) lock X->refs_lock set EXTENT_BUFFER_STALE on X release_extent_buffer(X) X->refs decremented to 3 unlocks X->refs_lock btrfs_release_path() unlocks X free_extent_buffer(X) X->refs becomes 2 __btrfs_cow_block(Y) btrfs_alloc_tree_block() btrfs_reserve_extent() find_free_extent() gets offset == X->start btrfs_init_new_buffer(X->start) btrfs_find_create_tree_block(X->start) alloc_extent_buffer(X->start) find_extent_buffer(X->start) finds eb X in radix tree free_extent_buffer(X) lock X->refs_lock test X->refs == 2 test bit EXTENT_BUFFER_STALE is set test !extent_buffer_under_io(eb) increments X->refs to 3 mark_extent_buffer_accessed(X) check_buffer_tree_ref(X) --> does nothing, X->refs >= 2 and EXTENT_BUFFER_TREE_REF is set in X clear EXTENT_BUFFER_STALE from X locks X btrfs_mark_buffer_dirty() set_extent_buffer_dirty(X) check_buffer_tree_ref(X) --> does nothing, X->refs >= 2 and EXTENT_BUFFER_TREE_REF is set sets EXTENT_BUFFER_DIRTY on X test and clear EXTENT_BUFFER_TREE_REF decrements X->refs to 2 release_extent_buffer(X) decrements X->refs to 1 unlock X->refs_lock unlock X free_extent_buffer(X) lock X->refs_lock release_extent_buffer(X) decrements X->refs to 0 btrfs_release_extent_buffer_page(X) BUG_ON(extent_buffer_under_io(X)) --> EXTENT_BUFFER_DIRTY set on X Fix this by making find_extent buffer wait for any ongoing task currently executing free_extent_buffer()/free_extent_buffer_stale() if the extent buffer has the stale flag set. A more clean alternative would be to always increment the extent buffer's reference count while holding its refs_lock spinlock but find_extent_buffer is a performance critical area and that would cause lock contention whenever multiple tasks search for the same extent buffer concurrently. A build server running a SLES 12 kernel (3.12 kernel + over 450 upstream btrfs patches backported from newer kernels) was hitting this often: [1212302.461948] kernel BUG at ../fs/btrfs/extent_io.c:4507! (...) [1212302.470219] CPU: 1 PID: 19259 Comm: bs_sched Not tainted 3.12.36-38-default #1 [1212302.540792] Hardware name: Supermicro PDSM4/PDSM4, BIOS 6.00 04/17/2006 [1212302.540792] task: ffff8800e07e0100 ti: ffff8800d6412000 task.ti: ffff8800d6412000 [1212302.540792] RIP: 0010:[<ffffffffa0507081>] [<ffffffffa0507081>] btrfs_release_extent_buffer_page.constprop.51+0x101/0x110 [btrfs] (...) [1212302.630008] Call Trace: [1212302.630008] [<ffffffffa05070cd>] release_extent_buffer+0x3d/0xa0 [btrfs] [1212302.630008] [<ffffffffa04c2d9d>] btrfs_release_path+0x1d/0xa0 [btrfs] [1212302.630008] [<ffffffffa04c5c7e>] read_block_for_search.isra.33+0x13e/0x3a0 [btrfs] [1212302.630008] [<ffffffffa04c8094>] btrfs_search_slot+0x3f4/0xa80 [btrfs] [1212302.630008] [<ffffffffa04cf5d8>] lookup_inline_extent_backref+0xf8/0x630 [btrfs] [1212302.630008] [<ffffffffa04d13dd>] __btrfs_free_extent+0x11d/0xc40 [btrfs] [1212302.630008] [<ffffffffa04d64a4>] __btrfs_run_delayed_refs+0x394/0x11d0 [btrfs] [1212302.630008] [<ffffffffa04db379>] btrfs_run_delayed_refs.part.66+0x69/0x280 [btrfs] [1212302.630008] [<ffffffffa04ed2ad>] __btrfs_end_transaction+0x2ad/0x3d0 [btrfs] [1212302.630008] [<ffffffffa04f7505>] btrfs_evict_inode+0x4a5/0x500 [btrfs] [1212302.630008] [<ffffffff811b9e28>] evict+0xa8/0x190 [1212302.630008] [<ffffffff811b0330>] do_unlinkat+0x1a0/0x2b0 I was also able to reproduce this on a 3.19 kernel, corresponding to Chris' integration branch from about a month ago, running the following stress test on a qemu/kvm guest (with 4 virtual cpus and 16Gb of ram): while true; do mkfs.btrfs -l 4096 -f -b `expr 20 \* 1024 \* 1024 \* 1024` /dev/sdd mount /dev/sdd /mnt snapshot_cmd="btrfs subvolume snapshot -r /mnt" snapshot_cmd="$snapshot_cmd /mnt/snap_\`date +'%H_%M_%S_%N'\`" fsstress -d /mnt -n 25000 -p 8 -x "$snapshot_cmd" -X 100 umount /mnt done Which usually triggers the BUG_ON within less than 24 hours: [49558.618097] ------------[ cut here ]------------ [49558.619732] kernel BUG at fs/btrfs/extent_io.c:4551! (...) [49558.620031] CPU: 3 PID: 23908 Comm: fsstress Tainted: G W 3.19.0-btrfs-next-7+ #3 [49558.620031] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5-0-ge51488c-20140602_164612-nilsson.home.kraxel.org 04/01/2014 [49558.620031] task: ffff8800319fc0d0 ti: ffff880220da8000 task.ti: ffff880220da8000 [49558.620031] RIP: 0010:[<ffffffffa0476b1a>] [<ffffffffa0476b1a>] btrfs_release_extent_buffer_page+0x20/0xe9 [btrfs] (...) [49558.620031] Call Trace: [49558.620031] [<ffffffffa0476c73>] release_extent_buffer+0x90/0xd3 [btrfs] [49558.620031] [<ffffffff8142b10c>] ? _raw_spin_lock+0x3b/0x43 [49558.620031] [<ffffffffa0477052>] ? free_extent_buffer+0x37/0x94 [btrfs] [49558.620031] [<ffffffffa04770ab>] free_extent_buffer+0x90/0x94 [btrfs] [49558.620031] [<ffffffffa04396d5>] btrfs_release_path+0x4a/0x69 [btrfs] [49558.620031] [<ffffffffa0444907>] __btrfs_free_extent+0x778/0x80c [btrfs] [49558.620031] [<ffffffffa044a485>] __btrfs_run_delayed_refs+0xad2/0xc62 [btrfs] [49558.728054] [<ffffffff811420d5>] ? kmemleak_alloc_recursive.constprop.52+0x16/0x18 [49558.728054] [<ffffffffa044c1e8>] btrfs_run_delayed_refs+0x6d/0x1ba [btrfs] [49558.728054] [<ffffffffa045917f>] ? join_transaction.isra.9+0xb9/0x36b [btrfs] [49558.728054] [<ffffffffa045a75c>] btrfs_commit_transaction+0x4c/0x981 [btrfs] [49558.728054] [<ffffffffa0434f86>] btrfs_sync_fs+0xd5/0x10d [btrfs] [49558.728054] [<ffffffff81155923>] ? iterate_supers+0x60/0xc4 [49558.728054] [<ffffffff8117966a>] ? do_sync_work+0x91/0x91 [49558.728054] [<ffffffff8117968a>] sync_fs_one_sb+0x20/0x22 [49558.728054] [<ffffffff81155939>] iterate_supers+0x76/0xc4 [49558.728054] [<ffffffff811798e8>] sys_sync+0x55/0x83 [49558.728054] [<ffffffff8142bbd2>] system_call_fastpath+0x12/0x17 Signed-off-by:Filipe Manana <fdmanana@suse.com> Reviewed-by:
David Sterba <dsterba@suse.cz> Signed-off-by:
Chris Mason <clm@fb.com>
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Filipe Manana authored
So creating a block group has 2 distinct phases: Phase 1 - creates the btrfs_block_group_cache item and adds it to the rbtree fs_info->block_group_cache_tree and to the corresponding list space_info->block_groups[]; Phase 2 - adds the block group item to the extent tree and corresponding items to the chunk tree. The first phase adds the block_group_cache_item to a list of pending block groups in the transaction handle, and phase 2 happens when btrfs_end_transaction() is called against the transaction handle. It happens that once phase 1 completes, other concurrent tasks that use their own transaction handle, but points to the same running transaction (struct btrfs_trans_handle->transaction), can use this block group for space allocations and therefore mark it dirty. Dirty block groups are tracked in a list belonging to the currently running transaction (struct btrfs_transaction) and not in the transaction handle (btrfs_trans_handle). This is a problem because once a task calls btrfs_commit_transaction(), it calls btrfs_start_dirty_block_groups() which will see all dirty block groups and attempt to start their writeout, including those that are still attached to the transaction handle of some concurrent task that hasn't called btrfs_end_transaction() yet - which means those block groups haven't gone through phase 2 yet and therefore when write_one_cache_group() is called, it won't find the block group items in the extent tree and abort the current transaction with -ENOENT, turning the fs into readonly mode and require a remount. Fix this by ignoring -ENOENT when looking for block group items in the extent tree when we attempt to start the writeout of the block group caches outside the critical section of the transaction commit. We will try again later during the critical section and if there we still don't find the block group item in the extent tree, we then abort the current transaction. This issue happened twice, once while running fstests btrfs/067 and once for btrfs/078, which produced the following trace: [ 3278.703014] WARNING: CPU: 7 PID: 18499 at fs/btrfs/super.c:260 __btrfs_abort_transaction+0x52/0x114 [btrfs]() [ 3278.707329] BTRFS: Transaction aborted (error -2) (...) [ 3278.731555] Call Trace: [ 3278.732396] [<ffffffff8142fa46>] dump_stack+0x4f/0x7b [ 3278.733860] [<ffffffff8108b6a2>] ? console_unlock+0x361/0x3ad [ 3278.735312] [<ffffffff81045ea5>] warn_slowpath_common+0xa1/0xbb [ 3278.736874] [<ffffffffa03ada6d>] ? __btrfs_abort_transaction+0x52/0x114 [btrfs] [ 3278.738302] [<ffffffff81045f05>] warn_slowpath_fmt+0x46/0x48 [ 3278.739520] [<ffffffffa03ada6d>] __btrfs_abort_transaction+0x52/0x114 [btrfs] [ 3278.741222] [<ffffffffa03b9e56>] write_one_cache_group+0xae/0xbf [btrfs] [ 3278.742797] [<ffffffffa03c487b>] btrfs_start_dirty_block_groups+0x170/0x2b2 [btrfs] [ 3278.744492] [<ffffffffa03d309c>] btrfs_commit_transaction+0x130/0x9c9 [btrfs] [ 3278.746084] [<ffffffff8107d33d>] ? trace_hardirqs_on+0xd/0xf [ 3278.747249] [<ffffffffa03e5660>] btrfs_sync_file+0x313/0x387 [btrfs] [ 3278.748744] [<ffffffff8117acad>] vfs_fsync_range+0x95/0xa4 [ 3278.749958] [<ffffffff81435b54>] ? ret_from_sys_call+0x1d/0x58 [ 3278.751218] [<ffffffff8117acd8>] vfs_fsync+0x1c/0x1e [ 3278.754197] [<ffffffff8117ae54>] do_fsync+0x34/0x4e [ 3278.755192] [<ffffffff8117b07c>] SyS_fsync+0x10/0x14 [ 3278.756236] [<ffffffff81435b32>] system_call_fastpath+0x12/0x17 [ 3278.757366] ---[ end trace 9a4d4df4969709aa ]--- Fixes: 1bbc621e ("Btrfs: allow block group cache writeout outside critical section in commit") Signed-off-by:
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Filipe Manana authored
When waiting for the writeback of block group cache we returned immediately if there was an error during writeback without waiting for the ordered extent to complete. This left a short time window where if some other task attempts to start the writeout for the same block group cache it can attempt to add a new ordered extent, starting at the same offset (0) before the previous one is removed from the ordered tree, causing an ordered tree panic (calls BUG()). This normally doesn't happen in other write paths, such as buffered writes or direct IO writes for regular files, since before marking page ranges dirty we lock the ranges and wait for any ordered extents within the range to complete first. Fix this by making btrfs_wait_ordered_range() not return immediately if it gets an error from the writeback, waiting for all ordered extents to complete first. This issue happened often when running the fstest btrfs/088 and it's easy to trigger it by running in a loop until the panic happens: for ((i = 1; i <= 10000; i++)) do ./check btrfs/088 ; done [17156.862573] BTRFS critical (device sdc): panic in ordered_data_tree_panic:70: Inconsistency in ordered tree at offset 0 (errno=-17 Object already exists) [17156.864052] ------------[ cut here ]------------ [17156.864052] kernel BUG at fs/btrfs/ordered-data.c:70! (...) [17156.864052] Call Trace: [17156.864052] [<ffffffffa03876e3>] btrfs_add_ordered_extent+0x12/0x14 [btrfs] [17156.864052] [<ffffffffa03787e2>] run_delalloc_nocow+0x5bf/0x747 [btrfs] [17156.864052] [<ffffffffa03789ff>] run_delalloc_range+0x95/0x353 [btrfs] [17156.864052] [<ffffffffa038b7fe>] writepage_delalloc.isra.16+0xb9/0x13f [btrfs] [17156.864052] [<ffffffffa038d75b>] __extent_writepage+0x129/0x1f7 [btrfs] [17156.864052] [<ffffffffa038da5a>] extent_write_cache_pages.isra.15.constprop.28+0x231/0x2f4 [btrfs] [17156.864052] [<ffffffff810ad2af>] ? __module_text_address+0x12/0x59 [17156.864052] [<ffffffff8107d33d>] ? trace_hardirqs_on+0xd/0xf [17156.864052] [<ffffffffa038df76>] extent_writepages+0x4b/0x5c [btrfs] [17156.864052] [<ffffffff81144431>] ? kmem_cache_free+0x9b/0xce [17156.864052] [<ffffffffa0376a46>] ? btrfs_submit_direct+0x3fc/0x3fc [btrfs] [17156.864052] [<ffffffffa0389cd6>] ? free_extent_state+0x8c/0xc1 [btrfs] [17156.864052] [<ffffffffa0374871>] btrfs_writepages+0x28/0x2a [btrfs] [17156.864052] [<ffffffff8110c4c8>] do_writepages+0x23/0x2c [17156.864052] [<ffffffff81102f36>] __filemap_fdatawrite_range+0x5a/0x61 [17156.864052] [<ffffffff81102f6e>] filemap_fdatawrite_range+0x13/0x15 [17156.864052] [<ffffffffa0383ef7>] btrfs_fdatawrite_range+0x21/0x48 [btrfs] [17156.864052] [<ffffffffa03ab89e>] __btrfs_write_out_cache.isra.14+0x2d9/0x3a7 [btrfs] [17156.864052] [<ffffffffa03ac1ab>] ? btrfs_write_out_cache+0x41/0xdc [btrfs] [17156.864052] [<ffffffffa03ac1fd>] btrfs_write_out_cache+0x93/0xdc [btrfs] [17156.864052] [<ffffffffa0363847>] ? btrfs_start_dirty_block_groups+0x13a/0x2b2 [btrfs] [17156.864052] [<ffffffffa03638e6>] btrfs_start_dirty_block_groups+0x1d9/0x2b2 [btrfs] [17156.864052] [<ffffffff8107d33d>] ? trace_hardirqs_on+0xd/0xf [17156.864052] [<ffffffffa037209e>] btrfs_commit_transaction+0x130/0x9c9 [btrfs] [17156.864052] [<ffffffffa034c748>] btrfs_sync_fs+0xe1/0x12d [btrfs] Signed-off-by:
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Filipe Manana authored
If the writeback of an inode cache failed we were unnecessarilly attempting to release again the delalloc metadata that we previously reserved. However attempting to do this a second time triggers an assertion at drop_outstanding_extent() because we have no more outstanding extents for our inode cache's inode. If we were able to start writeback of the cache the reserved metadata space is released at btrfs_finished_ordered_io(), even if an error happens during writeback. So make sure we don't repeat the metadata space release if writeback started for our inode cache. This issue was trivial to reproduce by running the fstest btrfs/088 with "-o inode_cache", which triggered the assertion leading to a BUG() call and requiring a reboot in order to run the remaining fstests. Trace produced by btrfs/088: [255289.385904] BTRFS: assertion failed: BTRFS_I(inode)->outstanding_extents >= num_extents, file: fs/btrfs/extent-tree.c, line: 5276 [255289.388094] ------------[ cut here ]------------ [255289.389184] kernel BUG at fs/btrfs/ctree.h:4057! [255289.390125] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC (...) [255289.392068] Call Trace: [255289.392068] [<ffffffffa035e774>] drop_outstanding_extent+0x3d/0x6d [btrfs] [255289.392068] [<ffffffffa0364988>] btrfs_delalloc_release_metadata+0x54/0xe3 [btrfs] [255289.392068] [<ffffffffa03b4174>] btrfs_write_out_ino_cache+0x95/0xad [btrfs] [255289.392068] [<ffffffffa036f5c4>] btrfs_save_ino_cache+0x275/0x2dc [btrfs] [255289.392068] [<ffffffffa03e2d83>] commit_fs_roots.isra.12+0xaa/0x137 [btrfs] [255289.392068] [<ffffffff8107d33d>] ? trace_hardirqs_on+0xd/0xf [255289.392068] [<ffffffffa037841f>] ? btrfs_commit_transaction+0x4b1/0x9c9 [btrfs] [255289.392068] [<ffffffff814351a4>] ? _raw_spin_unlock+0x32/0x46 [255289.392068] [<ffffffffa037842e>] btrfs_commit_transaction+0x4c0/0x9c9 [btrfs] (...) Signed-off-by:
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- 07 May, 2015 1 commit
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Filipe Manana authored
We were passing a flags value that differed from the intention in commit 2b108268 ("Btrfs: don't use highmem for free space cache pages"). This caused problems in a ARM machine, leaving btrfs unusable there. Reported-by:
Merlijn Wajer <merlijn@wizzup.org> Tested-by:
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- 29 Apr, 2015 1 commit
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Forrest Liu authored
btrfs_release_extent_buffer_page() can't handle dummy extent that allocated by btrfs_clone_extent_buffer() properly. That is because reference count of pages that allocated by btrfs_clone_extent_buffer() was 2, 1 by alloc_page(), and another by attach_extent_buffer_page(). Running following command repeatly can check this memory leak problem btrfs inspect-internal inode-resolve 256 /mnt/btrfs Signed-off-by:Chien-Kuan Yeh <ckya@synology.com> Signed-off-by:
Forrest Liu <forrestl@synology.com> Reviewed-by:
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- 26 Apr, 2015 9 commits
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Yang Dongsheng authored
We need to fill inode when we found a node for it in delayed_nodes_tree. But we did not fill the ->last_trans currently, it will cause the test of xfstest/generic/311 fail. Scenario of the 311 is shown as below: Problem: (1). test_fd = open(fname, O_RDWR|O_DIRECT) (2). pwrite(test_fd, buf, 4096, 0) (3). close(test_fd) (4). drop_all_caches() <-------- "echo 3 > /proc/sys/vm/drop_caches" (5). test_fd = open(fname, O_RDWR|O_DIRECT) (6). fsync(test_fd); <-------- we did not get the correct log entry for the file Reason: When we re-open this file in (5), we would find a node in delayed_nodes_tree and fill the inode we are lookup with the information. But the ->last_trans is not filled, then the fsync() will check the ->last_trans and found it's 0 then say this inode is already in our tree which is commited, not recording the extents for it. Fix: This patch fill the ->last_trans properly and set the runtime_flags if needed in this situation. Then we can get the log entries we expected after (6) and generic/311 passed. Signed-off-by:
Dongsheng Yang <yangds.fnst@cn.fujitsu.com> Reviewed-by:
Miao Xie <miaoxie@huawei.com> Signed-off-by:
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Omar Sandoval authored
Whenever the check for a send in progress introduced in commit 521e0546 (btrfs: protect snapshots from deleting during send) is hit, we return without unlocking inode->i_mutex. This is easy to see with lockdep enabled: [ +0.000059] ================================================ [ +0.000028] [ BUG: lock held when returning to user space! ] [ +0.000029] 4.0.0-rc5-00096-g3c435c1e #93 Not tainted [ +0.000026] ------------------------------------------------ [ +0.000029] btrfs/211 is leaving the kernel with locks still held! [ +0.000029] 1 lock held by btrfs/211: [ +0.000023] #0: (&type->i_mutex_dir_key){+.+.+.}, at: [<ffffffff8135b8df>] btrfs_ioctl_snap_destroy+0x2df/0x7a0 Make sure we unlock it in the error path. Reviewed-by:
Omar Sandoval <osandov@osandov.com> Signed-off-by:
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Omar Sandoval authored
If io_ctl_prepare_pages fails, the pages in io_ctl.pages are not valid. When we try to access them later, things will blow up in various ways. Also fix the comment about the return value, which is an errno on error, not -1, and update the cases where it was not. Reviewed-by:
Liu Bo <bo.li.liu@oracle.com> Signed-off-by:
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Omar Sandoval authored
Consider the following interleaving of overlapping calls to alloc_extent_buffer: Call 1: - Successfully allocates a few pages with find_or_create_page - find_or_create_page fails, goto free_eb - Unlocks the allocated pages Call 2: - Calls find_or_create_page and gets a page in call 1's extent_buffer - Finds that the page is already associated with an extent_buffer - Grabs a reference to the half-written extent_buffer and calls mark_extent_buffer_accessed on it mark_extent_buffer_accessed will then try to call mark_page_accessed on a null page and panic. The fix is to decrement the reference count on the half-written extent_buffer before unlocking the pages so call 2 won't use it. We should also set exists = NULL in the case that we don't use exists to avoid accidentally returning a freed extent_buffer in an error case. Signed-off-by:
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Omar Sandoval authored
This is one of the first places to give out when memory is tight. Handle it properly rather than with a BUG_ON. Also fix the comment about the return value, which is an ERR_PTR, not NULL, on error. Signed-off-by:
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Forrest Liu authored
If device tree has hole, find_free_dev_extent() cannot find available address properly. The problem can be reproduce by following script. mntpath=/btrfs loopdev=/dev/loop0 filepath=/home/forrest/image umount $mntpath losetup -d $loopdev truncate --size 100g $filepath losetup $loopdev $filepath mkfs.btrfs -f $loopdev mount $loopdev $mntpath # make device tree with one big hole for i in `seq 1 1 100`; do fallocate -l 1g $mntpath/$i done sync for i in `seq 1 1 95`; do rm $mntpath/$i done sync # wait cleaner thread remove unused block group sleep 300 fallocate -l 1g $mntpath/aaa # failed to allocate new chunk fallocate -l 1g $mntpath/bbb Above script will make device tree with one big hole, and can only allocate just one chunk in a transaction, so failed to allocate new chunk for $mntpath/bbb item 8 key (1 DEV_EXTENT 2185232384) itemoff 15859 itemsize 48 dev extent chunk_tree 3 chunk objectid 256 chunk offset 106292051968 length 1073741824 item 9 key (1 DEV_EXTENT 104190705664) itemoff 15811 itemsize 48 dev extent chunk_tree 3 chunk objectid 256 chunk offset 103108575232 length 1073741824 Signed-off-by: -
Chris Mason authored
Now that we're doing free space cache writeback outside the critical section in the commit, there is a bigger window for delalloc_bytes to be added after a cache has been written. find_free_extent may do this without putting the block group back into the dirty list, and also without a transaction running. Checking for delalloc_bytes in cache_save_setup means we might leave the cache marked as written without invalidating it. Consistency checks during mount will toss the cache, but it's better to get rid of the check in cache_save_setup and let it get invalidated by the checks already done during cache write out. Signed-off-by: -
Filipe Manana authored
While starting the writes of the dirty block group caches, if we don't find a block group item in the extent tree we were leaving without releasing our path, running delayed references and then looping again to process any new dirty block groups. However this second iteration of the loop could cause a deadlock because it tries to lock some other extent tree node/leaf which another task already locked and it's blocked because it's waiting for a lock on some node/leaf that is in our path that was not released before. We could also deadlock when running the delayed references - as we could end up trying to lock the same nodes/leafs that we have in our local path (with a different lock type). Got into such case when running xfstests: [20892.242791] ------------[ cut here ]------------ [20892.243776] WARNING: CPU: 0 PID: 13299 at fs/btrfs/super.c:260 __btrfs_abort_transaction+0x52/0x114 [btrfs]() [20892.245874] BTRFS: Transaction aborted (error -2) (...) [20892.269378] Call Trace: [20892.269915] [<ffffffff8142fa46>] dump_stack+0x4f/0x7b [20892.271097] [<ffffffff8108b6a2>] ? console_unlock+0x361/0x3ad [20892.272173] [<ffffffff81045ea5>] warn_slowpath_common+0xa1/0xbb [20892.273386] [<ffffffffa0509a6d>] ? __btrfs_abort_transaction+0x52/0x114 [btrfs] [20892.274857] [<ffffffff81045f05>] warn_slowpath_fmt+0x46/0x48 [20892.275851] [<ffffffffa0509a6d>] __btrfs_abort_transaction+0x52/0x114 [btrfs] [20892.277341] [<ffffffffa0515e10>] write_one_cache_group+0x68/0xaf [btrfs] [20892.278628] [<ffffffffa052088a>] btrfs_start_dirty_block_groups+0x18d/0x29b [btrfs] [20892.280191] [<ffffffffa052f077>] btrfs_commit_transaction+0x130/0x9c9 [btrfs] (...) [20892.291316] ---[ end trace 597f77e664245373 ]--- [20892.293955] BTRFS: error (device sdg) in write_one_cache_group:3184: errno=-2 No such entry [20892.297390] BTRFS info (device sdg): forced readonly [20892.298222] ------------[ cut here ]------------ [20892.299190] WARNING: CPU: 0 PID: 13299 at fs/btrfs/ctree.c:2683 btrfs_search_slot+0x7e/0x7d2 [btrfs]() (...) [20892.326253] Call Trace: [20892.326904] [<ffffffff8142fa46>] dump_stack+0x4f/0x7b [20892.329503] [<ffffffff8108b6a2>] ? console_unlock+0x361/0x3ad [20892.330815] [<ffffffff81045ea5>] warn_slowpath_common+0xa1/0xbb [20892.332556] [<ffffffffa0510b73>] ? btrfs_search_slot+0x7e/0x7d2 [btrfs] [20892.333955] [<ffffffff81045f62>] warn_slowpath_null+0x1a/0x1c [20892.335562] [<ffffffffa0510b73>] btrfs_search_slot+0x7e/0x7d2 [btrfs] [20892.336849] [<ffffffff8107b024>] ? arch_local_irq_save+0x9/0xc [20892.338222] [<ffffffffa051ad52>] ? cache_save_setup+0x43/0x2a5 [btrfs] [20892.339823] [<ffffffffa051ad66>] ? cache_save_setup+0x57/0x2a5 [btrfs] [20892.341275] [<ffffffff814351a4>] ? _raw_spin_unlock+0x32/0x46 [20892.342810] [<ffffffffa0515de7>] write_one_cache_group+0x3f/0xaf [btrfs] [20892.344184] [<ffffffffa052088a>] btrfs_start_dirty_block_groups+0x18d/0x29b [btrfs] [20892.347162] [<ffffffffa052f077>] btrfs_commit_transaction+0x130/0x9c9 [btrfs] (...) [20892.361015] ---[ end trace 597f77e664245374 ]--- [21120.688097] INFO: task kworker/u8:17:29854 blocked for more than 120 seconds. [21120.689881] Tainted: G W 4.0.0-rc5-btrfs-next-9+ #2 [21120.691384] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. (...) [21120.703696] Call Trace: [21120.704310] [<ffffffff8143107e>] schedule+0x74/0x83 [21120.705490] [<ffffffffa055f025>] btrfs_tree_lock+0xd7/0x236 [btrfs] [21120.706757] [<ffffffff81075cd6>] ? signal_pending_state+0x31/0x31 [21120.708156] [<ffffffffa054ac1e>] lock_extent_buffer_for_io+0x3e/0x194 [btrfs] [21120.709892] [<ffffffffa054bb86>] ? btree_write_cache_pages+0x273/0x385 [btrfs] [21120.711605] [<ffffffffa054bc42>] btree_write_cache_pages+0x32f/0x385 [btrfs] [21120.723440] [<ffffffffa0527552>] btree_writepages+0x23/0x5c [btrfs] [21120.724943] [<ffffffff8110c4c8>] do_writepages+0x23/0x2c [21120.726008] [<ffffffff81176dde>] __writeback_single_inode+0x73/0x2fa [21120.727230] [<ffffffff8117714a>] ? writeback_sb_inodes+0xe5/0x38b [21120.728526] [<ffffffff811771fb>] ? writeback_sb_inodes+0x196/0x38b [21120.729701] [<ffffffff8117726a>] writeback_sb_inodes+0x205/0x38b (...) [21120.747853] INFO: task btrfs:13282 blocked for more than 120 seconds. [21120.749459] Tainted: G W 4.0.0-rc5-btrfs-next-9+ #2 [21120.751137] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. (...) [21120.768457] Call Trace: [21120.769039] [<ffffffff8143107e>] schedule+0x74/0x83 [21120.770107] [<ffffffffa052f25c>] btrfs_commit_transaction+0x315/0x9c9 [btrfs] [21120.771558] [<ffffffff81075cd6>] ? signal_pending_state+0x31/0x31 [21120.773659] [<ffffffffa056fd8c>] prepare_to_relocate+0xcb/0xd2 [btrfs] [21120.776257] [<ffffffffa05741da>] relocate_block_group+0x44/0x4a9 [btrfs] [21120.777755] [<ffffffffa05747a0>] ? btrfs_relocate_block_group+0x161/0x288 [btrfs] [21120.779459] [<ffffffffa05747a8>] btrfs_relocate_block_group+0x169/0x288 [btrfs] [21120.781153] [<ffffffffa0550403>] btrfs_relocate_chunk.isra.29+0x3e/0xa7 [btrfs] [21120.783918] [<ffffffffa05518fd>] btrfs_balance+0xaa4/0xc52 [btrfs] [21120.785436] [<ffffffff8114306e>] ? cpu_cache_get.isra.39+0xe/0x1f [21120.786434] [<ffffffffa0559252>] btrfs_ioctl_balance+0x23f/0x2b0 [btrfs] (...) [21120.889251] INFO: task fsstress:13288 blocked for more than 120 seconds. [21120.890526] Tainted: G W 4.0.0-rc5-btrfs-next-9+ #2 [21120.891773] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. (...) [21120.899960] Call Trace: [21120.900743] [<ffffffff8143107e>] schedule+0x74/0x83 [21120.903004] [<ffffffffa055f025>] btrfs_tree_lock+0xd7/0x236 [btrfs] [21120.904383] [<ffffffff81075cd6>] ? signal_pending_state+0x31/0x31 [21120.905608] [<ffffffffa051125b>] btrfs_search_slot+0x766/0x7d2 [btrfs] [21120.906812] [<ffffffff8114290e>] ? virt_to_head_page+0x9/0x2c [21120.907874] [<ffffffff81144b7f>] ? cache_alloc_debugcheck_after.isra.42+0x16c/0x1cb [21120.909551] [<ffffffffa05124e0>] btrfs_insert_empty_items+0x5d/0xa8 [btrfs] [21120.910914] [<ffffffffa0512585>] btrfs_insert_item+0x5a/0xa5 [btrfs] [21120.912181] [<ffffffffa0520271>] ? btrfs_create_pending_block_groups+0x96/0x130 [btrfs] [21120.913784] [<ffffffffa052028a>] btrfs_create_pending_block_groups+0xaf/0x130 [btrfs] [21120.915374] [<ffffffffa052ffc2>] __btrfs_end_transaction+0x84/0x366 [btrfs] [21120.916735] [<ffffffffa05302b4>] btrfs_end_transaction+0x10/0x12 [btrfs] [21120.917996] [<ffffffffa051ab26>] btrfs_check_data_free_space+0x11f/0x27c [btrfs] [21120.919478] [<ffffffffa051ba25>] btrfs_delalloc_reserve_space+0x1e/0x51 [btrfs] [21120.921226] [<ffffffffa05382f2>] btrfs_truncate_page+0x85/0x2c4 [btrfs] [21120.923121] [<ffffffffa0538572>] btrfs_cont_expand+0x41/0x3ef [btrfs] [21120.924449] [<ffffffffa0541091>] ? btrfs_file_write_iter+0x19a/0x431 [btrfs] [21120.926602] [<ffffffff8107b024>] ? arch_local_irq_save+0x9/0xc [21120.927769] [<ffffffffa0541091>] ? btrfs_file_write_iter+0x19a/0x431 [btrfs] [21120.929324] [<ffffffffa05410a0>] ? btrfs_file_write_iter+0x1a9/0x431 [btrfs] [21120.930723] [<ffffffffa05410d9>] btrfs_file_write_iter+0x1e2/0x431 [btrfs] [21120.931897] [<ffffffff81067d85>] ? get_parent_ip+0xe/0x3e [21120.934446] [<ffffffff811534c3>] new_sync_write+0x7c/0xa0 [21120.935528] [<ffffffff81153b58>] vfs_write+0xb2/0x117 (...) Fixes: 1bbc621e ("Btrfs: allow block group cache writeout outside critical section in commit") Signed-off-by:
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Filipe Manana authored
While running xfstests I ran into the following: [20892.242791] ------------[ cut here ]------------ [20892.243776] WARNING: CPU: 0 PID: 13299 at fs/btrfs/super.c:260 __btrfs_abort_transaction+0x52/0x114 [btrfs]() [20892.245874] BTRFS: Transaction aborted (error -2) [20892.247329] Modules linked in: btrfs dm_snapshot dm_bufio dm_flakey dm_mod crc32c_generic xor raid6_pq nfsd auth_rpcgss oid_registry nfs_acl nfs lockd grace fscache sunrpc loop fuse$ [20892.258488] CPU: 0 PID: 13299 Comm: fsstress Tainted: G W 4.0.0-rc5-btrfs-next-9+ #2 [20892.262011] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5-0-ge51488c-20140602_164612-nilsson.home.kraxel.org 04/01/2014 [20892.264738] 0000000000000009 ffff880427f8bc18 ffffffff8142fa46 ffffffff8108b6a2 [20892.266244] ffff880427f8bc68 ffff880427f8bc58 ffffffff81045ea5 ffff880427f8bc48 [20892.267761] ffffffffa0509a6d 00000000fffffffe ffff8803545d6f40 ffffffffa05a15a0 [20892.269378] Call Trace: [20892.269915] [<ffffffff8142fa46>] dump_stack+0x4f/0x7b [20892.271097] [<ffffffff8108b6a2>] ? console_unlock+0x361/0x3ad [20892.272173] [<ffffffff81045ea5>] warn_slowpath_common+0xa1/0xbb [20892.273386] [<ffffffffa0509a6d>] ? __btrfs_abort_transaction+0x52/0x114 [btrfs] [20892.274857] [<ffffffff81045f05>] warn_slowpath_fmt+0x46/0x48 [20892.275851] [<ffffffffa0509a6d>] __btrfs_abort_transaction+0x52/0x114 [btrfs] [20892.277341] [<ffffffffa0515e10>] write_one_cache_group+0x68/0xaf [btrfs] [20892.278628] [<ffffffffa052088a>] btrfs_start_dirty_block_groups+0x18d/0x29b [btrfs] [20892.280191] [<ffffffffa052f077>] btrfs_commit_transaction+0x130/0x9c9 [btrfs] [20892.281781] [<ffffffff8107d33d>] ? trace_hardirqs_on+0xd/0xf [20892.282873] [<ffffffffa054163b>] btrfs_sync_file+0x313/0x387 [btrfs] [20892.284111] [<ffffffff8117acad>] vfs_fsync_range+0x95/0xa4 [20892.285203] [<ffffffff810e603f>] ? time_hardirqs_on+0x15/0x28 [20892.286290] [<ffffffff8123960b>] ? trace_hardirqs_on_thunk+0x3a/0x3f [20892.287469] [<ffffffff8117acd8>] vfs_fsync+0x1c/0x1e [20892.288412] [<ffffffff8117ae54>] do_fsync+0x34/0x4e [20892.289348] [<ffffffff8117b07c>] SyS_fsync+0x10/0x14 [20892.290255] [<ffffffff81435b32>] system_call_fastpath+0x12/0x17 [20892.291316] ---[ end trace 597f77e664245373 ]--- [20892.293955] BTRFS: error (device sdg) in write_one_cache_group:3184: errno=-2 No such entry [20892.297390] BTRFS info (device sdg): forced readonly This happens because in btrfs_start_dirty_block_groups() we splice the transaction's list of dirty block groups into a local list and then we keep extracting the first element of the list without holding the cache_write_mutex mutex. This means that before we acquire that mutex the first block group on the list might be removed by a conurrent task running btrfs_remove_block_group(). So make sure we extract the first element (and test the list emptyness) while holding that mutex. Fixes: 1bbc621e ("Btrfs: allow block group cache writeout outside critical section in commit") Signed-off-by:
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- 24 Apr, 2015 2 commits
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Chris Mason authored
__btrfs_write_out_cache is holding the ctl->tree_lock while it prepares a list of bitmaps to record in the free space cache. It was dropping the lock while it worked on other components, which made a window for free_bitmap() to free the bitmap struct without removing it from the list. This changes things to hold the lock the whole time, and also makes sure we hold the lock during enospc cleanup. Reported-by:
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Chris Mason authored
The code to fix stalls during free spache cache IO wasn't using the correct root when waiting on the IO for inode caches. This is only a problem when the inode cache is enabled with mount -o inode_cache This fixes the inode cache writeout to preserve any error values and makes sure not to override the root when inode cache writeout is done. Reported-by:
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- 13 Apr, 2015 23 commits
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Qu Wenruo authored
Previous patch modified the in memory struct but it's not written in quota tree until next commit. So user will still get old data using "btrfs qgroup show" after assign/remove. This patch will call btrfs_run_qgroups in assign ioctl so it will be updated to in memory quota trees and user will get up-to-date results. Signed-off-by:
Qu Wenruo <quwenruo@cn.fujitsu.com> Reviewed-by:
Josef Bacik <jbacik@fb.com> Signed-off-by:
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Qu Wenruo authored
btrfs: quota: Automatically update related qgroups or mark INCONSISTENT flags when assigning/deleting a qgroup relations. Operation like qgroups assigning/deleting qgroup relations will mostly cause qgroup data inconsistent, since it needs to do the full rescan to determine whether shared extents are exclusive or still shared in parent qgroups. But there are some exceptions, like qgroup with only exclusive extents (qgroup->excl == qgroup->rfer), in that case, we only needs to modify all its parents' excl and rfer. So this patch adds a quick path for such qgroup in qgroup assign/remove routine, and if quick path failed, the qgroup status will be marked INCONSISTENT, and return 1 to info user-land. BTW since the quick path is much the same of qgroup_excl_accounting(), so move the core of it to __qgroup_excl_accounting() and reuse it. Signed-off-by:
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Dongsheng Yang authored
we forgot to clear STATUS_FLAG_ON in quota_disable(), it will cause a problem shown as below: # mount /dev/sdc /mnt # btrfs quota enable /mnt # btrfs quota disable /mnt # btrfs quota rescan /mnt quota rescan started <--- expecting it fail here. # echo $? 0 Signed-off-by:
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Qu Wenruo authored
Update qgroup status when rescan is done. Before this patch, status item is not updated on rescan finish, which causing the RESCAN and INCONSISTENT flags never cleared. Signed-off-by:
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Qu Wenruo authored
Old qgroup_rescan_leaf() comment indicates ret == 2 as complete and cleared INCONSISTENT flag. This is not true since it will never return 2, and inside it no codes will clear INCONSISTENT flag. The flag clearance is done in btrfs_qgroup_rescan_work(). This caused the bug that INCONSISTENT flag is never cleared. So change the comment and fix the dead judgment. Signed-off-by:
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Qu Wenruo authored
Btrfs will create qgroup on subvolume creation if quota is enabled, but qgroup uses the high bits(currently 16 bits) as level, to build the inheritance. However it is fully possible a subvolume can be created with a subvolumeid larger than 1 << BTRFS_QGROUP_LEVEL_SHIFT, so it will be considered as level 1 and can't be assigned to other qgroup in level 1. This patch will prevent such things so qgroup inheritance will not be screwed up. The downside is very clear, btrfs subvolume number limit will decrease from (u64 max - 256(fisrt free objectid) - 256(last free objectid)) to (u48 max -256(first free objectid)). But we still have near u48(that's 15 digits in dec), so that should not be a huge problem. Signed-off-by:
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Qu Wenruo authored
Although we have qgroup level check in btrfs-progs, it's not enough since other programe may still call ioctl directly not using btrfs-progs. For example, systemd. But it's btrfs-progs to be blame since we don't provide a full-function(like subvolume create things) btrfs library with enough check, and only rely on kernel ioctl. So Add level checks in kernel too. Signed-off-by:
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Dongsheng Yang authored
When a qgroup has parents but no child, it should be removable in Theory I think. But currently, we can not remove it when it has either parent or child. Example: # btrfs quota enable /mnt # btrfs qgroup create 1/0 /mnt # btrfs qgroup create 2/0 /mnt # btrfs qgroup assign 1/0 2/0 /mnt # btrfs qgroup show -pcre /mnt qgroupid rfer excl max_rfer max_excl parent child -------- ---- ---- -------- -------- ------ ----- 0/5 16384 16384 0 0 --- --- 1/0 0 0 0 0 2/0 --- 2/0 0 0 0 0 --- 1/0 At this time, there is no subvol or qgroup depending on it. Just a qgroup 2/0 is its parent, but 2/0 can work well without 1/0. So I think 1/0 should be removalbe. But: # btrfs qgroup destroy 1/0 /mnt ERROR: unable to destroy quota group: Device or resource busy This patch remove the check of qgroup->parent in removing it, then we can remove a qgroup when it has a parent. Signed-off-by:
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Dongsheng Yang authored
When we create a subvol inheriting a qgroup, we need to check the level of them. Otherwise, there is a chance a qgroup can inherit another qgroup at the same level. Signed-off-by:
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Dongsheng Yang authored
There are two problems in qgroup: a). The PAGE_CACHE is 4K, even when we are writing a data of 1K, qgroup will reserve a 4K size. It will cause the last 3K in a qgroup is not available to user. b). When user is writing a inline data, qgroup will not reserve it, it means this is a window we can exceed the limit of a qgroup. The main idea of this patch is reserving the data size of write_bytes rather than the reserve_bytes. It means qgroup will not care about the data size btrfs will reserve for user, but only care about the data size user is going to write. Then reserve it when user want to write and release it in transaction committed. In this way, qgroup can be released from the complex procedure in btrfs and only do the reserve when user want to write and account when the data is written in commit_transaction(). Signed-off-by:
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Dongsheng Yang authored
Currenly, in data writing, ->reserved is accounted in fill_delalloc(), but ->may_use is released in clear_bit_hook() which is called by btrfs_finish_ordered_io(). That's too late, that said, between fill_delalloc() and btrfs_finish_ordered_io(), the data is doublely accounted by qgroup. It will cause some unexpected -EDQUOT. Example: # btrfs quota enable /root/btrfs-auto-test/ # btrfs subvolume create /root/btrfs-auto-test//sub Create subvolume '/root/btrfs-auto-test/sub' # btrfs qgroup limit 1G /root/btrfs-auto-test//sub dd if=/dev/zero of=/root/btrfs-auto-test//sub/file bs=1024 count=1500000 dd: error writing '/root/btrfs-auto-test//sub/file': Disk quota exceeded 681353+0 records in 681352+0 records out 697704448 bytes (698 MB) copied, 8.15563 s, 85.5 MB/s It's (698 MB) when we got an -EDQUOT, but we limit it by 1G. This patch move the btrfs_qgroup_reserve/free() for data from btrfs_delalloc_reserve/release_metadata() to btrfs_check_data_free_space() and btrfs_free_reserved_data_space(). Then the accounter in qgroup will be updated at the same time with the accounter in space_info updated. In this way, the unexpected -EDQUOT will be killed. Reported-by:
Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com> Signed-off-by:
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Dongsheng Yang authored
Currently, for pre_alloc or delay_alloc, the bytes will be accounted in space_info by the three guys. space_info->bytes_may_use --- space_info->reserved --- space_info->used. But on the other hand, in qgroup, there are only two counters to account the bytes, qgroup->reserved and qgroup->excl. And qg->reserved accounts bytes in space_info->bytes_may_use and qg->excl accounts bytes in space_info->used. So the bytes in space_info->reserved is not accounted in qgroup. If so, there is a window we can exceed the quota limit when bytes is in space_info->reserved. Example: # btrfs quota enable /mnt # btrfs qgroup limit -e 10M /mnt # for((i=0;i<20;i++));do fallocate -l 1M /mnt/data$i; done # sync # btrfs qgroup show -pcre /mnt qgroupid rfer excl max_rfer max_excl parent child -------- ---- ---- -------- -------- ------ ----- 0/5 20987904 20987904 0 10485760 --- --- qg->excl is 20987904 larger than max_excl 10485760. This patch introduce a new counter named may_use to qgroup, then there are three counters in qgroup to account bytes in space_info as below. space_info->bytes_may_use --- space_info->reserved --- space_info->used. qgroup->may_use --- qgroup->reserved --- qgroup->excl With this patch applied: # btrfs quota enable /mnt # btrfs qgroup limit -e 10M /mnt # for((i=0;i<20;i++));do fallocate -l 1M /mnt/data$i; done fallocate: /mnt/data9: fallocate failed: Disk quota exceeded fallocate: /mnt/data10: fallocate failed: Disk quota exceeded fallocate: /mnt/data11: fallocate failed: Disk quota exceeded fallocate: /mnt/data12: fallocate failed: Disk quota exceeded fallocate: /mnt/data13: fallocate failed: Disk quota exceeded fallocate: /mnt/data14: fallocate failed: Disk quota exceeded fallocate: /mnt/data15: fallocate failed: Disk quota exceeded fallocate: /mnt/data16: fallocate failed: Disk quota exceeded fallocate: /mnt/data17: fallocate failed: Disk quota exceeded fallocate: /mnt/data18: fallocate failed: Disk quota exceeded fallocate: /mnt/data19: fallocate failed: Disk quota exceeded # sync # btrfs qgroup show -pcre /mnt qgroupid rfer excl max_rfer max_excl parent child -------- ---- ---- -------- -------- ------ ----- 0/5 9453568 9453568 0 10485760 --- --- Reported-by:
Cyril SCETBON <cyril.scetbon@free.fr> Signed-off-by:
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Dongsheng Yang authored
When we exceed quota limit in writing, we will free some reserved extent when we need to drop but not free account in qgroup. It means, each time we exceed quota in writing, there will be some remain space in qg->reserved we can not use any more. If things go on like this, the all space will be ate up. Signed-off-by:
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Dongsheng Yang authored
Signed-off-by:
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Dongsheng Yang authored
btrfs_limit_group use arg limit to override the old qgroup_limit of corresponding qgroup. However, we should override part of old qgroup_limit according to the bit which has been set in arg limit. Signed-off-by:
Fan Chengniang <fancn.fnst@cn.fujitsu.com> Signed-off-by:
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Dongsheng Yang authored
When we commit_transaction(), qgroups in btree should be updated. But, limit info is not considered currently. It will cause a problem when a qgroup of a snapshot inherit the limit info from srcqgroup, then there is an inconsistency. Signed-off-by:
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Dongsheng Yang authored
Cleanup: Change the parameter of update_qgroup_limit_item() to the family of update_qgroup_xxx_item(). Signed-off-by:
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Dongsheng Yang authored
When we call btrfs_qgroup_inherit() with BTRFS_QGROUP_INHERIT_SET_LIMITS, btrfs will update the limit info of qgroup in btree but forget to update the qgroup in rbtree at the same time. It obviousely will cause an inconsistency. This patch fix it by updating the rbtree at the same time. Signed-off-by:
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Dongsheng Yang authored
Currently, when we snapshot a subvol, snapshot will not copy the limits from srcqgroup. This patch make the qgroup in snapshot inherit the limit info when create a snapshot. Signed-off-by:
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Zhao Lei authored
Reproduce: while true; do dd if=/dev/zero of=/mnt/btrfs/file count=[75% fs_size] rm /mnt/btrfs/file done Then we can see above loop failed on NO_SPACE. It it long-term problem since very beginning, because delayed-iput after rm are not run. We already have commit_transaction() in alloc_space code, but it is not triggered in above case. This patch trigger commit_transaction() to run delayed-iput and reflash pinned-space to to make write success. It is based on previous fix of delayed-iput in commit_transaction(), need to be applied on top of: btrfs: Fix NO_SPACE bug caused by delayed-iput Signed-off-by:
Zhao Lei <zhaolei@cn.fujitsu.com> Signed-off-by:
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Zhao Lei authored
Steps to reproduce: while true; do dd if=/dev/zero of=/btrfs_dir/file count=[fs_size * 75%] rm /btrfs_dir/file sync done And we'll see dd failed because btrfs return NO_SPACE. Reason: Normally, btrfs_commit_transaction() call btrfs_run_delayed_iputs() in end to free fs space for next write, but sometimes it hadn't done work on time, because btrfs-cleaner thread get delayed-iputs from list before, but do iput() after next write. This is log: [ 2569.050776] comm=btrfs-cleaner func=btrfs_evict_inode() begin [ 2569.084280] comm=sync func=btrfs_commit_transaction() call btrfs_run_delayed_iputs() [ 2569.085418] comm=sync func=btrfs_commit_transaction() done btrfs_run_delayed_iputs() [ 2569.087554] comm=sync func=btrfs_commit_transaction() end [ 2569.191081] comm=dd begin [ 2569.790112] comm=dd func=__btrfs_buffered_write() ret=-28 [ 2569.847479] comm=btrfs-cleaner func=add_pinned_bytes() 0 + 32677888 = 32677888 [ 2569.849530] comm=btrfs-cleaner func=add_pinned_bytes() 32677888 + 23834624 = 56512512 ... [ 2569.903893] comm=btrfs-cleaner func=add_pinned_bytes() 943976448 + 21762048 = 965738496 [ 2569.908270] comm=btrfs-cleaner func=btrfs_evict_inode() end Fix: Make btrfs_commit_transaction() wait current running btrfs-cleaner's delayed-iputs() done in end. Test: Use script similar to above(more complex), before patch: 7 failed in 100 * 20 loop. after patch: 0 failed in 100 * 20 loop. Signed-off-by: -
Zhao Lei authored
space_info's value calculation is some complex and easy to cause bug, add WARN_ON() to help debug. Changelog v1->v2: Put WARN_ON()s under the ENOSPC_DEBUG mount option. Suggested by: David Sterba <dsterba@suse.cz> Signed-off-by:
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Zhao Lei authored
Bug1: space_info->bytes_readonly was set to very large(negative) value in btrfs_remove_block_group(). Reason: Current code set block_group_cache->pinned = 0 in btrfs_delete_unused_bgs(), but above space was not counted to space_info->bytes_readonly. Then in btrfs_remove_block_group(): block_group->space_info->bytes_readonly -= block_group->key.offset; We can see following value in trace: btrfs_remove_block_group: pid=2677 comm=btrfs-cleaner WARNING: bytes_readonly=12582912, key.offset=134217728 Bug2: space_info->total_bytes_pinned grow to value larger than fs size. In a 1.2G fs, we can get following trace log: at first: ZL_DEBUG: add_pinned_bytes: pid=2710 comm=sync change total_bytes_pinned flags=1 869793792 + 95944704 = 965738496 after some op: ZL_DEBUG: add_pinned_bytes: pid=2770 comm=sync change total_bytes_pinned flags=1 1780178944 + 95944704 = 1876123648 after some op: ZL_DEBUG: add_pinned_bytes: pid=3193 comm=sync change total_bytes_pinned flags=1 2924568576 + 95551488 = 3020120064 ... Reason: Similar to bug1, we also need to adjust space_info->total_bytes_pinned in above code block. Signed-off-by:
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