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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, Filipe Manana <fdmanana@suse.com>,
	David Sterba <dsterba@suse.com>
Subject: [PATCH 4.19 076/105] Btrfs: send, flush dellaloc in order to avoid data loss
Date: Mon, 20 May 2019 14:14:22 +0200
Message-ID: <20190520115252.487467638@linuxfoundation.org> (raw)
In-Reply-To: <20190520115247.060821231@linuxfoundation.org>

From: Filipe Manana <fdmanana@suse.com>

commit 9f89d5de8631c7930898a601b6612e271aa2261c upstream.

When we set a subvolume to read-only mode we do not flush dellaloc for any
of its inodes (except if the filesystem is mounted with -o flushoncommit),
since it does not affect correctness for any subsequent operations - except
for a future send operation. The send operation will not be able to see the
delalloc data since the respective file extent items, inode item updates,
backreferences, etc, have not hit yet the subvolume and extent trees.

Effectively this means data loss, since the send stream will not contain
any data from existing delalloc. Another problem from this is that if the
writeback starts and finishes while the send operation is in progress, we
have the subvolume tree being being modified concurrently which can result
in send failing unexpectedly with EIO or hitting runtime errors, assertion
failures or hitting BUG_ONs, etc.

Simple reproducer:

  $ mkfs.btrfs -f /dev/sdb
  $ mount /dev/sdb /mnt

  $ btrfs subvolume create /mnt/sv
  $ xfs_io -f -c "pwrite -S 0xea 0 108K" /mnt/sv/foo

  $ btrfs property set /mnt/sv ro true
  $ btrfs send -f /tmp/send.stream /mnt/sv

  $ od -t x1 -A d /mnt/sv/foo
  0000000 ea ea ea ea ea ea ea ea ea ea ea ea ea ea ea ea
  *
  0110592

  $ umount /mnt
  $ mkfs.btrfs -f /dev/sdc
  $ mount /dev/sdc /mnt

  $ btrfs receive -f /tmp/send.stream /mnt
  $ echo $?
  0
  $ od -t x1 -A d /mnt/sv/foo
  0000000
  # ---> empty file

Since this a problem that affects send only, fix it in send by flushing
dellaloc for all the roots used by the send operation before send starts
to process the commit roots.

This is a problem that affects send since it was introduced (commit
31db9f7c23fbf7 ("Btrfs: introduce BTRFS_IOC_SEND for btrfs send/receive"))
but backporting it to older kernels has some dependencies:

- For kernels between 3.19 and 4.20, it depends on commit 3cd24c698004d2
  ("btrfs: use tagged writepage to mitigate livelock of snapshot") because
  the function btrfs_start_delalloc_snapshot() does not exist before that
  commit. So one has to either pick that commit or replace the calls to
  btrfs_start_delalloc_snapshot() in this patch with calls to
  btrfs_start_delalloc_inodes().

- For kernels older than 3.19 it also requires commit e5fa8f865b3324
  ("Btrfs: ensure send always works on roots without orphans") because
  it depends on the function ensure_commit_roots_uptodate() which that
  commits introduced.

- No dependencies for 5.0+ kernels.

A test case for fstests follows soon.

CC: stable@vger.kernel.org # 3.19+
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/btrfs/send.c |   36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -6583,6 +6583,38 @@ commit_trans:
 	return btrfs_commit_transaction(trans);
 }
 
+/*
+ * Make sure any existing dellaloc is flushed for any root used by a send
+ * operation so that we do not miss any data and we do not race with writeback
+ * finishing and changing a tree while send is using the tree. This could
+ * happen if a subvolume is in RW mode, has delalloc, is turned to RO mode and
+ * a send operation then uses the subvolume.
+ * After flushing delalloc ensure_commit_roots_uptodate() must be called.
+ */
+static int flush_delalloc_roots(struct send_ctx *sctx)
+{
+	struct btrfs_root *root = sctx->parent_root;
+	int ret;
+	int i;
+
+	if (root) {
+		ret = btrfs_start_delalloc_snapshot(root);
+		if (ret)
+			return ret;
+		btrfs_wait_ordered_extents(root, U64_MAX, 0, U64_MAX);
+	}
+
+	for (i = 0; i < sctx->clone_roots_cnt; i++) {
+		root = sctx->clone_roots[i].root;
+		ret = btrfs_start_delalloc_snapshot(root);
+		if (ret)
+			return ret;
+		btrfs_wait_ordered_extents(root, U64_MAX, 0, U64_MAX);
+	}
+
+	return 0;
+}
+
 static void btrfs_root_dec_send_in_progress(struct btrfs_root* root)
 {
 	spin_lock(&root->root_item_lock);
@@ -6807,6 +6839,10 @@ long btrfs_ioctl_send(struct file *mnt_f
 			NULL);
 	sort_clone_roots = 1;
 
+	ret = flush_delalloc_roots(sctx);
+	if (ret)
+		goto out;
+
 	ret = ensure_commit_roots_uptodate(sctx);
 	if (ret)
 		goto out;



  parent reply index

Thread overview: 131+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-20 12:13 [PATCH 4.19 000/105] 4.19.45-stable review Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 001/105] locking/rwsem: Prevent decrement of reader count before increment Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 002/105] x86/speculation/mds: Revert CPU buffer clear on double fault exit Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 003/105] x86/speculation/mds: Improve CPU buffer clear documentation Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 004/105] objtool: Fix function fallthrough detection Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 005/105] arm64: dts: rockchip: Disable DCMDs on RK3399s eMMC controller Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 006/105] ARM: dts: exynos: Fix interrupt for shared EINTs on Exynos5260 Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 007/105] ARM: dts: exynos: Fix audio (microphone) routing on Odroid XU3 Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 008/105] mmc: sdhci-of-arasan: Add DTS property to disable DCMDs Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 009/105] ARM: exynos: Fix a leaked reference by adding missing of_node_put Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 010/105] power: supply: axp288_charger: Fix unchecked return value Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 011/105] power: supply: axp288_fuel_gauge: Add ACEPC T8 and T11 mini PCs to the blacklist Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 012/105] arm64: mmap: Ensure file offset is treated as unsigned Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 013/105] arm64: arch_timer: Ensure counter register reads occur with seqlock held Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 014/105] arm64: compat: Reduce address limit Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 015/105] arm64: Clear OSDLR_EL1 on CPU boot Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 016/105] arm64: Save and restore OSDLR_EL1 across suspend/resume Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 017/105] sched/x86: Save [ER]FLAGS on context switch Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 018/105] crypto: crypto4xx - fix ctr-aes missing output IV Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 019/105] crypto: crypto4xx - fix cfb and ofb "overran dst buffer" issues Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 020/105] crypto: salsa20 - dont access already-freed walk.iv Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 021/105] crypto: chacha20poly1305 - set cra_name correctly Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 022/105] crypto: ccp - Do not free psp_master when PLATFORM_INIT fails Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 023/105] crypto: vmx - fix copy-paste error in CTR mode Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 024/105] crypto: skcipher - dont WARN on unprocessed data after slow walk step Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 025/105] crypto: crct10dif-generic - fix use via crypto_shash_digest() Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 026/105] crypto: x86/crct10dif-pcl " Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 027/105] crypto: arm64/gcm-aes-ce - fix no-NEON fallback code Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 028/105] crypto: gcm - fix incompatibility between "gcm" and "gcm_base" Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 029/105] crypto: rockchip - update IV buffer to contain the next IV Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 030/105] crypto: arm/aes-neonbs - dont access already-freed walk.iv Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 031/105] crypto: arm64/aes-neonbs " Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 032/105] mmc: core: Fix tag set memory leak Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 033/105] ALSA: line6: toneport: Fix broken usage of timer for delayed execution Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 034/105] ALSA: usb-audio: Fix a memory leak bug Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 035/105] ALSA: hda/hdmi - Read the pin sense from register when repolling Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 036/105] ALSA: hda/hdmi - Consider eld_valid when reporting jack event Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 037/105] ALSA: hda/realtek - EAPD turn on later Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 038/105] ALSA: hdea/realtek - Headset fixup for System76 Gazelle (gaze14) Greg Kroah-Hartman
2019-05-22  9:15   ` Pavel Machek
2019-05-22 10:22     ` Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 039/105] ASoC: max98090: Fix restore of DAPM Muxes Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 040/105] ASoC: RT5677-SPI: Disable 16Bit SPI Transfers Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 041/105] ASoC: fsl_esai: Fix missing break in switch statement Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 042/105] ASoC: codec: hdac_hdmi add device_link to card device Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 043/105] bpf, arm64: remove prefetch insn in xadd mapping Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 044/105] crypto: ccree - remove special handling of chained sg Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 045/105] crypto: ccree - fix mem leak on error path Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 046/105] crypto: ccree - dont map MAC key on stack Greg Kroah-Hartman
2019-05-22  8:49   ` Pavel Machek
2019-05-20 12:13 ` [PATCH 4.19 047/105] crypto: ccree - use correct internal state sizes for export Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 048/105] crypto: ccree - dont map AEAD key and IV on stack Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 049/105] crypto: ccree - pm resume first enable the source clk Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 050/105] crypto: ccree - HOST_POWER_DOWN_EN should be the last CC access during suspend Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 051/105] crypto: ccree - add function to handle cryptocell tee fips error Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 052/105] crypto: ccree - handle tee fips error during power management resume Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 053/105] mm/mincore.c: make mincore() more conservative Greg Kroah-Hartman
2019-05-22  8:57   ` Pavel Machek
2019-05-22  9:21     ` Michal Hocko
2019-05-23  9:18       ` Kevin Easton
2019-05-20 12:14 ` [PATCH 4.19 054/105] mm/huge_memory: fix vmf_insert_pfn_{pmd, pud}() crash, handle unaligned addresses Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 055/105] mm/hugetlb.c: dont put_page in lock of hugetlb_lock Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 056/105] hugetlb: use same fault hash key for shared and private mappings Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 057/105] ocfs2: fix ocfs2 read inode data panic in ocfs2_iget Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 058/105] userfaultfd: use RCU to free the task struct when fork fails Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 059/105] ACPI: PM: Set enable_for_wake for wakeup GPEs during suspend-to-idle Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 060/105] mfd: da9063: Fix OTP control register names to match datasheets for DA9063/63L Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 061/105] mfd: max77620: Fix swapped FPS_PERIOD_MAX_US values Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 062/105] mtd: spi-nor: intel-spi: Avoid crossing 4K address boundary on read/write Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 063/105] tty: vt.c: Fix TIOCL_BLANKSCREEN console blanking if blankinterval == 0 Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 064/105] tty/vt: fix write/write race in ioctl(KDSKBSENT) handler Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 065/105] jbd2: check superblock mapped prior to committing Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 066/105] ext4: make sanity check in mballoc more strict Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 067/105] ext4: protect journal inodes blocks using block_validity Greg Kroah-Hartman
2019-05-22  9:18   ` Pavel Machek
2019-05-22 10:21     ` Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 068/105] ext4: ignore e_value_offs for xattrs with value-in-ea-inode Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 069/105] ext4: avoid drop reference to iloc.bh twice Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 070/105] ext4: fix use-after-free race with debug_want_extra_isize Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 071/105] ext4: actually request zeroing of inode table after grow Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 072/105] ext4: fix ext4_show_options for file systems w/o journal Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 073/105] btrfs: Check the first key and level for cached extent buffer Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 074/105] btrfs: Correctly free extent buffer in case btree_read_extent_buffer_pages fails Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 075/105] btrfs: Honour FITRIM range constraints during free space trim Greg Kroah-Hartman
2019-05-20 12:14 ` Greg Kroah-Hartman [this message]
2019-05-20 12:14 ` [PATCH 4.19 077/105] Btrfs: do not start a transaction during fiemap Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 078/105] Btrfs: do not start a transaction at iterate_extent_inodes() Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 079/105] bcache: fix a race between cache register and cacheset unregister Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 080/105] bcache: never set KEY_PTRS of journal key to 0 in journal_reclaim() Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 081/105] ipmi:ssif: compare block number correctly for multi-part return messages Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 082/105] crypto: ccm - fix incompatibility between "ccm" and "ccm_base" Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 083/105] fs/writeback.c: use rcu_barrier() to wait for inflight wb switches going into workqueue when umount Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 084/105] tty: Dont force RISCV SBI console as preferred console Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 085/105] ext4: zero out the unused memory region in the extent tree block Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 086/105] ext4: fix data corruption caused by overlapping unaligned and aligned IO Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 087/105] ext4: fix use-after-free in dx_release() Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 088/105] ext4: avoid panic during forced reboot due to aborted journal Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 089/105] ALSA: hda/realtek - Corrected fixup for System76 Gazelle (gaze14) Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 090/105] ALSA: hda/realtek - Fixup headphone noise via runtime suspend Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 091/105] ALSA: hda/realtek - Fix for Lenovo B50-70 inverted internal microphone bug Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 092/105] jbd2: fix potential double free Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 093/105] KVM: x86: Skip EFER vs. guest CPUID checks for host-initiated writes Greg Kroah-Hartman
2019-05-22 11:20   ` Pavel Machek
2019-05-20 12:14 ` [PATCH 4.19 094/105] KVM: lapic: Busy wait for timer to expire when using hv_timer Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 095/105] kbuild: turn auto.conf.cmd into a mandatory include file Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 096/105] xen/pvh: set xen_domain_type to HVM in xen_pvh_init Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 097/105] libnvdimm/namespace: Fix label tracking error Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 098/105] iov_iter: optimize page_copy_sane() Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 099/105] pstore: Centralize init/exit routines Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 100/105] pstore: Allocate compression during late_initcall() Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 101/105] pstore: Refactor compression initialization Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 102/105] ext4: unsigned int compared against zero Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 103/105] ext4: fix block validity checks for journal inodes using indirect blocks Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 104/105] ext4: fix compile error when using BUFFER_TRACE Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 105/105] ext4: dont update s_rev_level if not required Greg Kroah-Hartman
2019-05-20 17:48 ` [PATCH 4.19 000/105] 4.19.45-stable review kernelci.org bot
2019-05-20 22:23 ` Dan Rue
2019-05-21  8:59   ` Greg Kroah-Hartman
2019-05-21  9:28     ` Naresh Kamboju
2019-05-21  9:38       ` ext4 regression (was Re: [PATCH 4.19 000/105] 4.19.45-stable review) Greg Kroah-Hartman
2019-05-21 10:28         ` Naresh Kamboju
2019-05-21 16:21           ` Theodore Ts'o
2019-05-21 16:30             ` Greg Kroah-Hartman
2019-05-21 16:44               ` Greg Kroah-Hartman
2019-05-21 17:57             ` Naresh Kamboju
2019-05-22  5:05               ` Theodore Ts'o
2019-05-22 10:20                 ` Naresh Kamboju
2019-05-21 15:02         ` Dan Rue
2019-05-21  8:51 ` [PATCH 4.19 000/105] 4.19.45-stable review Jon Hunter
2019-05-21 21:31 ` shuah
2019-05-22  5:04 ` Naresh Kamboju

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