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Groups > linux.kernel > #1620199

[PATCH 3.12 002/142] xfs: pass total block res. as total xfs_bmapi_write() parameter

From Jiri Slaby <jslaby@suse.cz>
Newsgroups linux.kernel
Subject [PATCH 3.12 002/142] xfs: pass total block res. as total xfs_bmapi_write() parameter
Date 2017-04-10 18:20 +0200
Message-ID <tuKcO-2ZH-33@gated-at.bofh.it> (permalink)
References <tuJA6-2uY-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

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From: Brian Foster <bfoster@redhat.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit dbd5c8c9a28899c6ca719eb21afc0afba9dd5574 upstream.

The total field from struct xfs_alloc_arg is a bit of an unknown
commodity. It is documented as the total block requirement for the
transaction and is used in this manner from most call sites by virtue of
passing the total block reservation of the transaction associated with
an allocation. Several xfs_bmapi_write() callers pass hardcoded values
of 0 or 1 for the total block requirement, which is a historical oddity
without any clear reasoning.

The xfs_iomap_write_direct() caller, for example, passes 0 for the total
block requirement. This has been determined to cause problems in the
form of ABBA deadlocks of AGF buffers due to incorrect AG selection in
the block allocator. Specifically, the xfs_alloc_space_available()
function incorrectly selects an AG that doesn't actually have sufficient
space for the allocation. This occurs because the args.total field is 0
and thus the remaining free space check on the AG doesn't actually
consider the size of the allocation request. This locks the AGF buffer,
the allocation attempt proceeds and ultimately fails (in
xfs_alloc_fix_minleft()), and xfs_alloc_vexent() moves on to the next
AG. In turn, this can lead to incorrect AG locking order (if the
allocator wraps around, attempting to lock AG 0 after acquiring AG N)
and thus deadlock if racing with another operation. This problem has
been reproduced via generic/299 on smallish (1GB) ramdisk test devices.

To avoid this problem, replace the undocumented hardcoded total
parameters from the iomap and utility callers to pass the block
reservation used for the associated transaction. This is consistent with
other xfs_bmapi_write() callers throughout XFS. The assumption is that
the total field allows the selection of an AG that can handle the entire
operation rather than simply the allocation/range being requested (e.g.,
resulting btree splits, etc.). This addresses the aforementioned
generic/299 hang by ensuring AG selection only occurs when the
allocation can be satisfied by the AG.

[nb] backport to 3.12

Reported-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Acked-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 fs/xfs/xfs_bmap_util.c | 2 +-
 fs/xfs/xfs_iomap.c     | 8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index 97f952caea74..42cb2f3ea51f 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -1100,7 +1100,7 @@ xfs_alloc_file_space(
 		xfs_bmap_init(&free_list, &firstfsb);
 		error = xfs_bmapi_write(tp, ip, startoffset_fsb,
 					allocatesize_fsb, alloc_type, &firstfsb,
-					0, imapp, &nimaps, &free_list);
+					resblks, imapp, &nimaps, &free_list);
 		if (error) {
 			goto error0;
 		}
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 8d4d49b6fbf3..1d48f7a9b63e 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -217,7 +217,7 @@ xfs_iomap_write_direct(
 	xfs_bmap_init(&free_list, &firstfsb);
 	nimaps = 1;
 	error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb, bmapi_flag,
-				&firstfsb, 0, imap, &nimaps, &free_list);
+				&firstfsb, resblks, imap, &nimaps, &free_list);
 	if (error)
 		goto out_bmap_cancel;
 
@@ -762,7 +762,7 @@ xfs_iomap_write_allocate(
 			error = xfs_bmapi_write(tp, ip, map_start_fsb,
 						count_fsb,
 						XFS_BMAPI_STACK_SWITCH,
-						&first_block, 1,
+						&first_block, nres,
 						imap, &nimaps, &free_list);
 			if (error)
 				goto trans_cancel;
@@ -877,8 +877,8 @@ xfs_iomap_write_unwritten(
 		xfs_bmap_init(&free_list, &firstfsb);
 		nimaps = 1;
 		error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb,
-				  XFS_BMAPI_CONVERT, &firstfsb,
-				  1, &imap, &nimaps, &free_list);
+					XFS_BMAPI_CONVERT, &firstfsb, resblks,
+					&imap, &nimaps, &free_list);
 		if (error)
 			goto error_on_bmapi_transaction;
 
-- 
2.12.2

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[PATCH 3.12 001/142] dm: flush queued bios when process blocks to avoid deadlock Jiri Slaby <jslaby@suse.cz> - 2017-04-10 17:40 +0200
  [PATCH 3.12 092/142] ext4: mark inode dirty after converting inline directory Jiri Slaby <jslaby@suse.cz> - 2017-04-10 17:40 +0200
  [PATCH 3.12 134/142] ipv4: igmp: Allow removing groups from a removed interface Jiri Slaby <jslaby@suse.cz> - 2017-04-10 17:40 +0200
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  [PATCH 3.12 129/142] ACPI / PNP: Avoid conflicting resource reservations Jiri Slaby <jslaby@suse.cz> - 2017-04-10 17:40 +0200
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  [PATCH 3.12 131/142] ACPI / PNP: Reserve ACPI resources at the fs_initcall_sync stage Jiri Slaby <jslaby@suse.cz> - 2017-04-10 17:40 +0200
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  [PATCH 3.12 130/142] ACPI / resources: free memory on error in add_region_before() Jiri Slaby <jslaby@suse.cz> - 2017-04-10 17:40 +0200
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  [PATCH 3.12 105/142] sparc/ptrace: Preserve previous registers for short regset write Jiri Slaby <jslaby@suse.cz> - 2017-04-10 17:50 +0200
  [PATCH 3.12 121/142] rtc: s35390a: improve irq handling Jiri Slaby <jslaby@suse.cz> - 2017-04-10 17:50 +0200
  [PATCH 3.12 112/142] scsi: libsas: fix ata xfer length Jiri Slaby <jslaby@suse.cz> - 2017-04-10 17:50 +0200
  [PATCH 3.12 109/142] sched/rt: Add a missing rescheduling point Jiri Slaby <jslaby@suse.cz> - 2017-04-10 17:50 +0200
  [PATCH 3.12 111/142] scsi: mpt3sas: fix hang on ata passthrough commands Jiri Slaby <jslaby@suse.cz> - 2017-04-10 17:50 +0200
  [PATCH 3.12 088/142] usb: hub: Fix crash after failure to read BOS descriptor Jiri Slaby <jslaby@suse.cz> - 2017-04-10 17:50 +0200
  [PATCH 3.12 103/142] virtio_balloon: init 1st buffer in stats vq Jiri Slaby <jslaby@suse.cz> - 2017-04-10 17:50 +0200
  [PATCH 3.12 100/142] crypto: algif_hash - avoid zero-sized array Jiri Slaby <jslaby@suse.cz> - 2017-04-10 17:50 +0200
  [PATCH 3.12 122/142] KVM: kvm_io_bus_unregister_dev() should never fail Jiri Slaby <jslaby@suse.cz> - 2017-04-10 17:50 +0200
  [PATCH 3.12 097/142] block: allow WRITE_SAME commands with the SG_IO ioctl Jiri Slaby <jslaby@suse.cz> - 2017-04-10 17:50 +0200
  [PATCH 3.12 116/142] KVM: x86: clear bus pointer when destroyed Jiri Slaby <jslaby@suse.cz> - 2017-04-10 17:50 +0200
  [PATCH 3.12 099/142] fbcon: Fix vc attr at deinit Jiri Slaby <jslaby@suse.cz> - 2017-04-10 17:50 +0200
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  [PATCH 3.12 106/142] metag/ptrace: Preserve previous registers for short regset write Jiri Slaby <jslaby@suse.cz> - 2017-04-10 17:50 +0200
  [PATCH 3.12 110/142] libceph: force GFP_NOIO for socket allocations Jiri Slaby <jslaby@suse.cz> - 2017-04-10 17:50 +0200
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  [PATCH 3.12 087/142] USB: wusbcore: fix NULL-deref at probe Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:00 +0200
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  [PATCH 3.12 043/142] netlink: remove mmapped netlink support Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:10 +0200
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  [PATCH 3.12 032/142] uapi: fix linux/packet_diag.h userspace compilation error Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:10 +0200
  [PATCH 3.12 053/142] cpufreq: Fix and clean up show_cpuinfo_cur_freq() Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:10 +0200
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  [PATCH 3.12 041/142] xfs: fix up xfs_swap_extent_forks inline extent handling Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:10 +0200
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  [PATCH 3.12 047/142] Drivers: hv: balloon: don't crash when memory is added in non-sorted order Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:10 +0200
  [PATCH 3.12 050/142] s390/pci: fix use after free in dma_init Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:10 +0200
  [PATCH 3.12 024/142] locking/static_keys: Add static_key_{en,dis}able() helpers Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 012/142] cpmac: remove hopeless #warning Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 035/142] dccp: fix memory leak during tear-down of unsuccessful connection request Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 017/142] USB: serial: safe_serial: fix information leak in completion handler Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 019/142] USB: iowarrior: fix NULL-deref at probe Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 015/142] usb: dwc3: gadget: make Set Endpoint Configuration macros safe Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 018/142] USB: serial: omninet: fix reference leaks at open Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 005/142] USB: serial: digi_acceleport: fix OOB data sanity check Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 029/142] net: net_enable_timestamp() can be called from irq contexts Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 004/142] xhci: fix 10 second timeout on removal of PCI hotpluggable xhci controllers Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 016/142] usb: host: xhci-plat: Fix timeout on removal of hot pluggable xhci controllers Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 007/142] crypto: improve gcc optimization flags for serpent and wp512 Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 013/142] MIPS: DEC: Avoid la pseudo-instruction in delay slots Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 025/142] vxlan: correctly validate VXLAN ID against VXLAN_N_VID Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 014/142] tracing: Add #undef to fix compile error Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 002/142] xfs: pass total block res. as total xfs_bmapi_write() parameter Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 009/142] MIPS: ip22: Fix ip28 build for modern gcc Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 011/142] MIPS: ralink: Cosmetic change to prom_init(). Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 010/142] mtd: pmcmsp: use kstrndup instead of kmalloc+strncpy Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 022/142] USB: serial: io_ti: fix information leak in completion handler Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 020/142] USB: iowarrior: fix NULL-deref in write Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 008/142] MIPS: ip27: Disable qlge driver in defconfig Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 021/142] USB: serial: io_ti: fix NULL-deref in interrupt callback Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 031/142] tcp: fix various issues for sockets morphing to listen state Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 006/142] USB: serial: digi_acceleport: fix OOB-event processing Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 027/142] l2tp: avoid use-after-free caused by l2tp_ip_backlog_recv Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 003/142] mm/huge_memory.c: respect FOLL_FORCE/FOLL_COW for thp Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200

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