- 26 4月, 2015 6 次提交
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由 Omar Sandoval 提交于
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: NOmar Sandoval <osandov@osandov.com> Reviewed-by: NDavid Sterba <dsterba@suse.cz> Reviewed-by: NLiu Bo <bo.li.liu@oracle.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Omar Sandoval 提交于
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: NOmar Sandoval <osandov@osandov.com> Reviewed-by: NDavid Sterba <dsterba@suse.cz> Signed-off-by: NChris Mason <clm@fb.com>
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由 Forrest Liu 提交于
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: NForrest Liu <forrestl@synology.com> Reviewed-by: NLiu Bo <bo.li.liu@oracle.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Chris Mason 提交于
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: NChris Mason <clm@fb.com>
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由 Filipe Manana 提交于
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: NFilipe Manana <fdmanana@suse.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Filipe Manana 提交于
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: NFilipe Manana <fdmanana@suse.com> Signed-off-by: NChris Mason <clm@fb.com>
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- 25 4月, 2015 1 次提交
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由 Chris Mason 提交于
__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: NFilipe Manana <fdmanana@suse.com> Signed-off-by: NChris Mason <clm@fb.com>
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- 24 4月, 2015 1 次提交
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由 Chris Mason 提交于
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: NFilipe Manana <fdmanana@suse.com> Signed-off-by: NChris Mason <clm@fb.com>
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- 13 4月, 2015 30 次提交
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由 Qu Wenruo 提交于
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: NQu Wenruo <quwenruo@cn.fujitsu.com> Reviewed-by: NJosef Bacik <jbacik@fb.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Qu Wenruo 提交于
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: NQu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: NDongsheng Yang <yangds.fnst@cn.fujitsu.com> Reviewed-by: NJosef Bacik <jbacik@fb.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Dongsheng Yang 提交于
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: NDongsheng Yang <yangds.fnst@cn.fujitsu.com> Reviewed-by: NJosef Bacik <jbacik@fb.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Qu Wenruo 提交于
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: NQu Wenruo <quwenruo@cn.fujitsu.com> Reviewed-by: NJosef Bacik <jbacik@fb.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Qu Wenruo 提交于
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: NQu Wenruo <quwenruo@cn.fujitsu.com> Reviewed-by: NJosef Bacik <jbacik@fb.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Qu Wenruo 提交于
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: NQu Wenruo <quwenruo@cn.fujitsu.com> Reviewed-by: NJosef Bacik <jbacik@fb.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Qu Wenruo 提交于
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: NQu Wenruo <quwenruo@cn.fujitsu.com> Reviewed-by: NJosef Bacik <jbacik@fb.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Dongsheng Yang 提交于
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: NDongsheng Yang <yangds.fnst@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Dongsheng Yang 提交于
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: NDongsheng Yang <yangds.fnst@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Dongsheng Yang 提交于
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: NDongsheng Yang <yangds.fnst@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Dongsheng Yang 提交于
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: NSatoru Takeuchi <takeuchi_satoru@jp.fujitsu.com> Signed-off-by: NDongsheng Yang <yangds.fnst@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Dongsheng Yang 提交于
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: NCyril SCETBON <cyril.scetbon@free.fr> Signed-off-by: NDongsheng Yang <yangds.fnst@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Dongsheng Yang 提交于
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: NDongsheng Yang <yangds.fnst@cn.fujitsu.com> Reviewed-by: NJosef Bacik <jbacik@fb.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Dongsheng Yang 提交于
Signed-off-by: NDongsheng Yang <yangds.fnst@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Dongsheng Yang 提交于
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: NFan Chengniang <fancn.fnst@cn.fujitsu.com> Signed-off-by: NDongsheng Yang <yangds.fnst@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Dongsheng Yang 提交于
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: NDongsheng Yang <yangds.fnst@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Dongsheng Yang 提交于
Cleanup: Change the parameter of update_qgroup_limit_item() to the family of update_qgroup_xxx_item(). Signed-off-by: NDongsheng Yang <yangds.fnst@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Dongsheng Yang 提交于
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: NDongsheng Yang <yangds.fnst@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Dongsheng Yang 提交于
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: NDongsheng Yang <yangds.fnst@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Zhao Lei 提交于
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: NZhao Lei <zhaolei@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Zhao Lei 提交于
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: NZhao Lei <zhaolei@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Zhao Lei 提交于
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: NZhao Lei <zhaolei@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Zhao Lei 提交于
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: NZhao Lei <zhaolei@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Zhao Lei 提交于
If we have any chance to make a successful write, we should not give up. This patch adjust commit-transaction condition from: pinned >= wanted to left + pinned >= wanted Signed-off-by: NZhao Lei <zhaolei@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Zhao Lei 提交于
It is another reason for NO_SPACE case. When we found enough free space in loop and saved them to max_hole_start/size before, and tail space contains pending extent, origional innocent max_hole_start/size are reset in retry. As a result, find_free_dev_extent() returns less space than it can, and cause NO_SPACE in user program. Reviewed-by: NLiu Bo <bo.li.liu@oracle.com> Signed-off-by: NZhao Lei <zhaolei@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Zhao Lei 提交于
Old code bypass commit transaction when we don't have enough pinned space, but another case is there exist freed bgs in current transction, it have possibility to make alloc_chunk success. This patch modify the condition to: if (have_free_bg || have_pinned_space) commit_transaction() Confirmed above action by printk before and after patch. Signed-off-by: NZhao Lei <zhaolei@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Chris Mason 提交于
Commit 0d97a64e0 creates a new variable but doesn't always set it up. This puts it back to the original method (key.offset + 1) for the cases not covered by Filipe's new logic. Signed-off-by: NChris Mason <clm@fb.com>
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由 Filipe Manana 提交于
If we attempt to clone a 0 length region into a file we can end up inserting a range in the inode's extent_io tree with a start offset that is greater then the end offset, which triggers immediately the following warning: [ 3914.619057] WARNING: CPU: 17 PID: 4199 at fs/btrfs/extent_io.c:435 insert_state+0x4b/0x10b [btrfs]() [ 3914.620886] BTRFS: end < start 4095 4096 (...) [ 3914.638093] Call Trace: [ 3914.638636] [<ffffffff81425fd9>] dump_stack+0x4c/0x65 [ 3914.639620] [<ffffffff81045390>] warn_slowpath_common+0xa1/0xbb [ 3914.640789] [<ffffffffa03ca44f>] ? insert_state+0x4b/0x10b [btrfs] [ 3914.642041] [<ffffffff810453f0>] warn_slowpath_fmt+0x46/0x48 [ 3914.643236] [<ffffffffa03ca44f>] insert_state+0x4b/0x10b [btrfs] [ 3914.644441] [<ffffffffa03ca729>] __set_extent_bit+0x107/0x3f4 [btrfs] [ 3914.645711] [<ffffffffa03cb256>] lock_extent_bits+0x65/0x1bf [btrfs] [ 3914.646914] [<ffffffff8142b2fb>] ? _raw_spin_unlock+0x28/0x33 [ 3914.648058] [<ffffffffa03cbac4>] ? test_range_bit+0xcc/0xde [btrfs] [ 3914.650105] [<ffffffffa03cb3c3>] lock_extent+0x13/0x15 [btrfs] [ 3914.651361] [<ffffffffa03db39e>] lock_extent_range+0x3d/0xcd [btrfs] [ 3914.652761] [<ffffffffa03de1fe>] btrfs_ioctl_clone+0x278/0x388 [btrfs] [ 3914.654128] [<ffffffff811226dd>] ? might_fault+0x58/0xb5 [ 3914.655320] [<ffffffffa03e0909>] btrfs_ioctl+0xb51/0x2195 [btrfs] (...) [ 3914.669271] ---[ end trace 14843d3e2e622fc1 ]--- This later makes the inode eviction handler enter an infinite loop that keeps dumping the following warning over and over: [ 3915.117629] WARNING: CPU: 22 PID: 4228 at fs/btrfs/extent_io.c:435 insert_state+0x4b/0x10b [btrfs]() [ 3915.119913] BTRFS: end < start 4095 4096 (...) [ 3915.137394] Call Trace: [ 3915.137913] [<ffffffff81425fd9>] dump_stack+0x4c/0x65 [ 3915.139154] [<ffffffff81045390>] warn_slowpath_common+0xa1/0xbb [ 3915.140316] [<ffffffffa03ca44f>] ? insert_state+0x4b/0x10b [btrfs] [ 3915.141505] [<ffffffff810453f0>] warn_slowpath_fmt+0x46/0x48 [ 3915.142709] [<ffffffffa03ca44f>] insert_state+0x4b/0x10b [btrfs] [ 3915.143849] [<ffffffffa03ca729>] __set_extent_bit+0x107/0x3f4 [btrfs] [ 3915.145120] [<ffffffffa038c1e3>] ? btrfs_kill_super+0x17/0x23 [btrfs] [ 3915.146352] [<ffffffff811548f6>] ? deactivate_locked_super+0x3b/0x50 [ 3915.147565] [<ffffffffa03cb256>] lock_extent_bits+0x65/0x1bf [btrfs] [ 3915.148785] [<ffffffff8142b7e2>] ? _raw_write_unlock+0x28/0x33 [ 3915.149931] [<ffffffffa03bc325>] btrfs_evict_inode+0x196/0x482 [btrfs] [ 3915.151154] [<ffffffff81168904>] evict+0xa0/0x148 [ 3915.152094] [<ffffffff811689e5>] dispose_list+0x39/0x43 [ 3915.153081] [<ffffffff81169564>] evict_inodes+0xdc/0xeb [ 3915.154062] [<ffffffff81154418>] generic_shutdown_super+0x49/0xef [ 3915.155193] [<ffffffff811546d1>] kill_anon_super+0x13/0x1e [ 3915.156274] [<ffffffffa038c1e3>] btrfs_kill_super+0x17/0x23 [btrfs] (...) [ 3915.167404] ---[ end trace 14843d3e2e622fc2 ]--- So just bail out of the clone ioctl if the length of the region to clone is zero, without locking any extent range, in order to prevent this issue (same behaviour as a pwrite with a 0 length for example). This is trivial to reproduce. For example, the steps for the test I just made for fstests: mkfs.btrfs -f SCRATCH_DEV mount SCRATCH_DEV $SCRATCH_MNT touch $SCRATCH_MNT/foo touch $SCRATCH_MNT/bar $CLONER_PROG -s 0 -d 4096 -l 0 $SCRATCH_MNT/foo $SCRATCH_MNT/bar umount $SCRATCH_MNT A test case for fstests follows soon. CC: <stable@vger.kernel.org> Signed-off-by: NFilipe Manana <fdmanana@suse.com> Reviewed-by: NOmar Sandoval <osandov@osandov.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Filipe Manana 提交于
If we pass a length of 0 to the extent_same ioctl, we end up locking an extent range with a start offset greater then its end offset (if the destination file's offset is greater than zero). This results in a warning from extent_io.c:insert_state through the following call chain: btrfs_extent_same() btrfs_double_lock() lock_extent_range() lock_extent(inode->io_tree, offset, offset + len - 1) lock_extent_bits() __set_extent_bit() insert_state() --> WARN_ON(end < start) This leads to an infinite loop when evicting the inode. This is the same problem that my previous patch titled "Btrfs: fix inode eviction infinite loop after cloning into it" addressed but for the extent_same ioctl instead of the clone ioctl. CC: <stable@vger.kernel.org> Signed-off-by: NFilipe Manana <fdmanana@suse.com> Reviewed-by: NOmar Sandoval <osandov@osandov.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Filipe Manana 提交于
While searching for extents to clone we might find one where we only use a part of it coming from its tail. If our destination inode is the same the source inode, we end up removing the tail part of the extent item and insert after a new one that point to the same extent with an adjusted key file offset and data offset. After this we search for the next extent item in the fs/subvol tree with a key that has an offset incremented by one. But this second search leaves us at the new extent item we inserted previously, and since that extent item has a non-zero data offset, it it can make us call btrfs_drop_extents with an empty range (start == end) which causes the following warning: [23978.537119] WARNING: CPU: 6 PID: 16251 at fs/btrfs/file.c:550 btrfs_drop_extent_cache+0x43/0x385 [btrfs]() (...) [23978.557266] Call Trace: [23978.557978] [<ffffffff81425fd9>] dump_stack+0x4c/0x65 [23978.559191] [<ffffffff81045390>] warn_slowpath_common+0xa1/0xbb [23978.560699] [<ffffffffa047f0ea>] ? btrfs_drop_extent_cache+0x43/0x385 [btrfs] [23978.562389] [<ffffffff8104544d>] warn_slowpath_null+0x1a/0x1c [23978.563613] [<ffffffffa047f0ea>] btrfs_drop_extent_cache+0x43/0x385 [btrfs] [23978.565103] [<ffffffff810e3a18>] ? time_hardirqs_off+0x15/0x28 [23978.566294] [<ffffffff81079ff8>] ? trace_hardirqs_off+0xd/0xf [23978.567438] [<ffffffffa047f73d>] __btrfs_drop_extents+0x6b/0x9e1 [btrfs] [23978.568702] [<ffffffff8107c03f>] ? trace_hardirqs_on+0xd/0xf [23978.569763] [<ffffffff811441c0>] ? ____cache_alloc+0x69/0x2eb [23978.570817] [<ffffffff81142269>] ? virt_to_head_page+0x9/0x36 [23978.571872] [<ffffffff81143c15>] ? cache_alloc_debugcheck_after.isra.42+0x16c/0x1cb [23978.573466] [<ffffffff811420d5>] ? kmemleak_alloc_recursive.constprop.52+0x16/0x18 [23978.574962] [<ffffffffa0480d07>] btrfs_drop_extents+0x66/0x7f [btrfs] [23978.576179] [<ffffffffa049aa35>] btrfs_clone+0x516/0xaf5 [btrfs] [23978.577311] [<ffffffffa04983dc>] ? lock_extent_range+0x7b/0xcd [btrfs] [23978.578520] [<ffffffffa049b2a2>] btrfs_ioctl_clone+0x28e/0x39f [btrfs] [23978.580282] [<ffffffffa049d9ae>] btrfs_ioctl+0xb51/0x219a [btrfs] (...) [23978.591887] ---[ end trace 988ec2a653d03ed3 ]--- Then we attempt to insert a new extent item with a key that already exists, which makes btrfs_insert_empty_item return -EEXIST resulting in abortion of the current transaction: [23978.594355] WARNING: CPU: 6 PID: 16251 at fs/btrfs/super.c:260 __btrfs_abort_transaction+0x52/0x114 [btrfs]() (...) [23978.622589] Call Trace: [23978.623181] [<ffffffff81425fd9>] dump_stack+0x4c/0x65 [23978.624359] [<ffffffff81045390>] warn_slowpath_common+0xa1/0xbb [23978.625573] [<ffffffffa044ab6c>] ? __btrfs_abort_transaction+0x52/0x114 [btrfs] [23978.626971] [<ffffffff810453f0>] warn_slowpath_fmt+0x46/0x48 [23978.628003] [<ffffffff8108a6c8>] ? vprintk_default+0x1d/0x1f [23978.629138] [<ffffffffa044ab6c>] __btrfs_abort_transaction+0x52/0x114 [btrfs] [23978.630528] [<ffffffffa049ad1b>] btrfs_clone+0x7fc/0xaf5 [btrfs] [23978.631635] [<ffffffffa04983dc>] ? lock_extent_range+0x7b/0xcd [btrfs] [23978.632886] [<ffffffffa049b2a2>] btrfs_ioctl_clone+0x28e/0x39f [btrfs] [23978.634119] [<ffffffffa049d9ae>] btrfs_ioctl+0xb51/0x219a [btrfs] (...) [23978.647714] ---[ end trace 988ec2a653d03ed4 ]--- This is wrong because we should not process the extent item that we just inserted previously, and instead process the extent item that follows it in the tree For example for the test case I wrote for fstests: bs=$((64 * 1024)) mkfs.btrfs -f -l $bs -O ^no-holes /dev/sdc mount /dev/sdc /mnt xfs_io -f -c "pwrite -S 0xaa $(($bs * 2)) $(($bs * 2))" /mnt/foo $CLONER_PROG -s $((3 * $bs)) -d $((267 * $bs)) -l 0 /mnt/foo /mnt/foo $CLONER_PROG -s $((217 * $bs)) -d $((95 * $bs)) -l 0 /mnt/foo /mnt/foo The second clone call fails with -EEXIST, because when we process the first extent item (offset 262144), we drop part of it (counting from the end) and then insert a new extent item with a key greater then the key we found. The next time we search the tree we search for a key with offset 262144 + 1, which leaves us at the new extent item we have just inserted but we think it refers to an extent that we need to clone. Fix this by ensuring the next search key uses an offset corresponding to the offset of the key we found previously plus the data length of the corresponding extent item. This ensures we skip new extent items that we inserted and works for the case of implicit holes too (NO_HOLES feature). A test case for fstests follows soon. Signed-off-by: NFilipe Manana <fdmanana@suse.com> Signed-off-by: NChris Mason <clm@fb.com>
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- 11 4月, 2015 2 次提交
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由 Chris Mason 提交于
Near the end of close_ctree, we're calling btrfs_free_block_rsv to free up the orphan rsv. The problem is this call updates the space_info, which has already been freed. This adds a new __ function that directly calls kfree instead of trying to update the space infos. Signed-off-by: NChris Mason <clm@fb.com>
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由 Chris Mason 提交于
We loop through all of the dirty block groups during commit and write the free space cache. In order to make sure the cache is currect, we do this while no other writers are allowed in the commit. If a large number of block groups are dirty, this can introduce long stalls during the final stages of the commit, which can block new procs trying to change the filesystem. This commit changes the block group cache writeout to take appropriate locks and allow it to run earlier in the commit. We'll still have to redo some of the block groups, but it means we can get most of the work out of the way without blocking the entire FS. Signed-off-by: NChris Mason <clm@fb.com>
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