Linus Torvalds
088737f44b
Writeback error handling fixes (pile #2 ) ...
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Merge tag 'for-linus-v4.13-2' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux
Pull Writeback error handling updates from Jeff Layton:
"This pile represents the bulk of the writeback error handling fixes
that I have for this cycle. Some of the earlier patches in this pile
may look trivial but they are prerequisites for later patches in the
series.
The aim of this set is to improve how we track and report writeback
errors to userland. Most applications that care about data integrity
will periodically call fsync/fdatasync/msync to ensure that their
writes have made it to the backing store.
For a very long time, we have tracked writeback errors using two flags
in the address_space: AS_EIO and AS_ENOSPC. Those flags are set when a
writeback error occurs (via mapping_set_error) and are cleared as a
side-effect of filemap_check_errors (as you noted yesterday). This
model really sucks for userland.
Only the first task to call fsync (or msync or fdatasync) will see the
error. Any subsequent task calling fsync on a file will get back 0
(unless another writeback error occurs in the interim). If I have
several tasks writing to a file and calling fsync to ensure that their
writes got stored, then I need to have them coordinate with one
another. That's difficult enough, but in a world of containerized
setups that coordination may even not be possible.
But wait...it gets worse!
The calls to filemap_check_errors can be buried pretty far down in the
call stack, and there are internal callers of filemap_write_and_wait
and the like that also end up clearing those errors. Many of those
callers ignore the error return from that function or return it to
userland at nonsensical times (e.g. truncate() or stat()). If I get
back -EIO on a truncate, there is no reason to think that it was
because some previous writeback failed, and a subsequent fsync() will
(incorrectly) return 0.
This pile aims to do three things:
1) ensure that when a writeback error occurs that that error will be
reported to userland on a subsequent fsync/fdatasync/msync call,
regardless of what internal callers are doing
2) report writeback errors on all file descriptions that were open at
the time that the error occurred. This is a user-visible change,
but I think most applications are written to assume this behavior
anyway. Those that aren't are unlikely to be hurt by it.
3) document what filesystems should do when there is a writeback
error. Today, there is very little consistency between them, and a
lot of cargo-cult copying. We need to make it very clear what
filesystems should do in this situation.
To achieve this, the set adds a new data type (errseq_t) and then
builds new writeback error tracking infrastructure around that. Once
all of that is in place, we change the filesystems to use the new
infrastructure for reporting wb errors to userland.
Note that this is just the initial foray into cleaning up this mess.
There is a lot of work remaining here:
1) convert the rest of the filesystems in a similar fashion. Once the
initial set is in, then I think most other fs' will be fairly
simple to convert. Hopefully most of those can in via individual
filesystem trees.
2) convert internal waiters on writeback to use errseq_t for
detecting errors instead of relying on the AS_* flags. I have some
draft patches for this for ext4, but they are not quite ready for
prime time yet.
This was a discussion topic this year at LSF/MM too. If you're
interested in the gory details, LWN has some good articles about this:
https://lwn.net/Articles/718734/
https://lwn.net/Articles/724307/ "
* tag 'for-linus-v4.13-2' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux:
btrfs: minimal conversion to errseq_t writeback error reporting on fsync
xfs: minimal conversion to errseq_t writeback error reporting
ext4: use errseq_t based error handling for reporting data writeback errors
fs: convert __generic_file_fsync to use errseq_t based reporting
block: convert to errseq_t based writeback error tracking
dax: set errors in mapping when writeback fails
Documentation: flesh out the section in vfs.txt on storing and reporting writeback errors
mm: set both AS_EIO/AS_ENOSPC and errseq_t in mapping_set_error
fs: new infrastructure for writeback error handling and reporting
lib: add errseq_t type and infrastructure for handling it
mm: don't TestClearPageError in __filemap_fdatawait_range
mm: clear AS_EIO/AS_ENOSPC when writeback initiation fails
jbd2: don't clear and reset errors after waiting on writeback
buffer: set errors in mapping at the time that the error occurs
fs: check for writeback errors after syncing out buffers in generic_file_fsync
buffer: use mapping_set_error instead of setting the flag
mm: fix mapping_set_error call in me_pagecache_dirty
2017-07-07 19:38:17 -07:00
firmware /meson
This is the bulk of GPIO changes for the v4.13 series:
2017-07-07 12:40:27 -07:00
- Core Frameworks
2017-07-07 13:38:26 -07:00
Char/Misc patches for 4.13-rc1
2017-07-03 20:55:59 -07:00
Merge (most of) tag 'mfd-next-4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd
2017-07-07 13:30:05 -07:00
Merge https://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2017-07-03 03:42:10 -07:00
mmc: slot-gpio: Add support to enable irq wake on cd_irq
2017-06-20 10:30:49 +02:00
pinctrl: generic: Add output-enable property
2017-06-29 14:30:49 +02:00
- Core Frameworks
2017-07-07 13:38:26 -07:00
qed: iWARP CM add error handling
2017-07-03 01:43:45 -07:00
Merge branch 'work.sys_wait' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-07-05 14:10:19 -07:00
Actions Semi SoC drivers for 4.13
2017-06-29 17:34:57 +02:00
This is the big bulk of pin control changes for the v4.13 series:
2017-07-06 11:38:59 -07:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
2017-07-05 12:31:59 -07:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
2017-07-05 12:31:59 -07:00
This is the bulk of GPIO changes for the v4.13 series:
2017-07-07 12:40:27 -07:00
net, atm: convert atm_dev.refcnt from atomic_t to refcount_t
2017-07-04 22:35:16 +01:00
percpu_counter: Rename __percpu_counter_add to percpu_counter_add_batch
2017-06-20 15:42:32 -04:00
Merge branch 'for-4.13/block' of git://git.kernel.dk/linux-block
2017-07-03 10:34:51 -07:00
percpu_counter: Rename __percpu_counter_add to percpu_counter_add_batch
2017-06-20 15:42:32 -04:00
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-07-03 13:08:04 -07:00
block: add support for write hints in a bio
2017-06-27 12:05:27 -06:00
block: remove the queue_bounce_pfn helper
2017-06-27 12:13:45 -06:00
mm: zero hash tables in allocator
2017-07-06 16:24:33 -07:00
bpf: BPF support for sock_ops
2017-07-01 16:15:13 -07:00
bpf: simplify narrower ctx access
2017-07-03 02:22:52 -07:00
bpf: BPF support for sock_ops
2017-07-01 16:15:13 -07:00
bpf: possibly avoid extra masking for narrower load in verifier
2017-06-23 14:04:11 -04:00
buffer: set errors in mapping at the time that the error occurs
2017-07-06 07:02:21 -04:00
cgroup: implement "nsdelegate" mount option
2017-06-28 14:45:21 -04:00
Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-07-03 16:14:51 -07:00
Merge branch 'misc.compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-07-06 20:57:13 -07:00
compiler, clang: always inline when CONFIG_OPTIMIZE_INLINING is disabled
2017-07-06 16:24:29 -07:00
compiler, clang: always inline when CONFIG_OPTIMIZE_INLINING is disabled
2017-07-06 16:24:29 -07:00
GCC plugin updates:
2017-07-05 11:46:59 -07:00
efi: parse ARM processor error
2017-06-22 15:43:47 +01:00
x86: use common aperfmperf_khz_on_cpu() to calculate KHz using APERF/MPERF
2017-06-27 01:47:32 +02:00
Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-07-03 18:08:06 -07:00
s390/crash: Remove unused KEXEC_NOTE_BYTES
2017-07-05 07:35:29 +02:00
libnvdimm, pmem, dax: export a cache control attribute
2017-06-29 09:29:50 -07:00
libnvdimm for 4.13
2017-07-07 09:44:06 -07:00
Add "shutdown" to "struct class".
2017-07-07 09:49:24 +10:00
dma-mapping: replace dmam_alloc_noncoherent with dmam_alloc_attrs
2017-06-28 06:55:00 -07:00
lib: add errseq_t type and infrastructure for handling it
2017-07-06 07:02:24 -04:00
sched/wait: Rename wait_queue_t => wait_queue_entry_t
2017-06-20 12:18:27 +02:00
include/linux/filter.h: use linux/set_memory.h
2017-07-06 16:24:30 -07:00
Writeback error handling fixes (pile #2 )
2017-07-07 19:38:17 -07:00
ftrace: Have cached module filters be an active filter
2017-06-26 11:53:04 -04:00
mm, page_alloc: pass preferred nid instead of zonelist to allocator
2017-07-06 16:24:34 -07:00
hashtable: remove repeated phrase from a comment
2017-06-30 13:49:53 -07:00
nanosleep: Use get_timespec64() and put_timespec64()
2017-06-30 04:14:14 -04:00
mm, THP, swap: check whether THP can be split firstly
2017-07-06 16:24:31 -07:00
mm/hugetlb: introduce set_huge_swap_pte_at() helper
2017-07-06 16:24:34 -07:00
ieee80211: update public action codes
2017-06-30 09:47:24 +03:00
net: convert ip_mc_list.refcnt from atomic_t to refcount_t
2017-07-01 07:39:08 -07:00
ima: define is_ima_appraise_enabled()
2017-06-21 14:37:12 -04:00
[media] media: Add userspace header file for i.MX
2017-06-20 07:25:17 -03:00
net: convert in_device.refcnt from atomic_t to refcount_t
2017-07-01 07:39:08 -07:00
genirq/timings: Add infrastructure for estimating the next interrupt arrival time
2017-06-24 11:44:39 +02:00
fs: Introduce IOMAP_NOWAIT
2017-06-20 07:12:03 -06:00
genirq: Introduce IRQD_SINGLE_TARGET flag
2017-06-22 18:21:25 +02:00
genirq/debugfs: Add proper debugfs interface
2017-06-22 18:21:13 +02:00
genirq/irqdomain: Remove auto-recursive hierarchy support
2017-06-22 18:29:34 +02:00
s390/crash: Remove unused KEXEC_NOTE_BYTES
2017-07-05 07:35:29 +02:00
There has been a fair amount of activity in the docs tree this time
2017-07-03 21:13:25 -07:00
mm: kmemleak: treat vm_struct as alternative reference to vmalloc'ed objects
2017-07-06 16:24:34 -07:00
Revert "ktime: Simplify ktime_compare implementation"
2017-06-26 10:39:40 +02:00
sched/wait: Rename wait_queue_t => wait_queue_entry_t
2017-06-20 12:18:27 +02:00
Merge branch 'for-4.13/dax' into libnvdimm-for-next
2017-07-03 16:54:58 -07:00
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security
2017-07-05 11:26:35 -07:00
mm, memory_hotplug: move movable_node to the hotplug proper
2017-07-06 16:24:35 -07:00
mm: memcontrol: per-lruvec stats infrastructure
2017-07-06 16:24:35 -07:00
mm, memory_hotplug: move movable_node to the hotplug proper
2017-07-06 16:24:35 -07:00
mm, mempolicy: simplify rebinding mempolicies when updating cpusets
2017-07-06 16:24:34 -07:00
Writeback error handling fixes (pile #1 )
2017-07-07 18:39:15 -07:00
percpu_counter: Rename __percpu_counter_add to percpu_counter_add_batch
2017-06-20 15:42:32 -04:00
mm: vmstat: move slab statistics from zone to node counters
2017-07-06 16:24:35 -07:00
moduleparam: fix doc: hwparam_irq configures an IRQ
2017-07-02 15:37:23 -07:00
libnvdimm, btt: BTT updates for UEFI 2.7 format
2017-06-29 13:50:38 -07:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
2017-07-05 12:31:59 -07:00
net: convert netpoll_info.refcnt from atomic_t to refcount_t
2017-07-01 07:39:08 -07:00
mm, memory_hotplug: split up register_one_node()
2017-07-06 16:24:32 -07:00
mm, memory_hotplug: drop CONFIG_MOVABLE_NODE
2017-07-06 16:24:35 -07:00
nvme: use a single NVME_AQ_DEPTH and relax it to 32
2017-06-28 08:14:13 -06:00
Merge branch 'dt/property-move' into dt/next
2017-07-05 08:31:52 -05:00
of: make of_fdt_is_compatible() static
2017-06-22 11:14:48 -05:00
mm, THP, swap: delay splitting THP during swap out
2017-07-06 16:24:31 -07:00
Writeback error handling fixes (pile #2 )
2017-07-07 19:38:17 -07:00
Power management updates for v4.13-rc1
2017-07-04 13:39:41 -07:00
percpu_counter: Rename __percpu_counter_add to percpu_counter_add_batch
2017-06-20 15:42:32 -04:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
2017-07-05 12:31:59 -07:00
net: phy: Add phy loopback support in net phy framework
2017-07-03 02:01:15 -07:00
platform: Accept const properties
2017-07-03 08:31:43 +02:00
PM / core: Drop run_wake flag from struct dev_pm_info
2017-06-28 01:52:52 +02:00
PM / OPP: Add dev_pm_opp_{set|put}_clkname()
2017-06-24 01:41:55 +02:00
PM / core: Drop run_wake flag from struct dev_pm_info
2017-06-28 01:52:52 +02:00
sched/wait: Rename wait_queue_t => wait_queue_entry_t
2017-06-20 12:18:27 +02:00
time: introduce {get,put}_itimerspec64
2017-06-25 21:58:46 -04:00
spin loop primitives for busy waiting
2017-06-28 22:49:11 +10:00
m68k updates for 4.13
2017-07-03 15:12:52 -07:00
ras: mark stub functions as 'inline'
2017-06-29 10:48:57 +01:00
locking/refcount: Remove the half-implemented refcount_sub() API
2017-07-02 11:24:36 +02:00
Merge remote-tracking branches 'regmap/topic/1wire', 'regmap/topic/irq' and 'regmap/topic/lzo' into regmap-next
2017-07-03 16:20:28 +01:00
mm, mempolicy: stop adjusting current->il_next in mpol_rebind_nodemask()
2017-07-06 16:24:34 -07:00
sctp: remove the typedef sctp_init_chunk_t
2017-07-01 09:08:42 -07:00
Merge branch 'stable-4.13' of git://git.infradead.org/users/pcmoore/selinux into next
2017-06-23 11:55:57 +10:00
provide linux/set_memory.h
2017-07-06 16:24:30 -07:00
Merge branch 'misc.compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-07-06 20:57:13 -07:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
2017-07-05 12:31:59 -07:00
mm/slub.c: wrap kmem_cache->cpu_partial in config CONFIG_SLUB_CPU_PARTIAL
2017-07-06 16:24:30 -07:00
mm, THP, swap: move anonymous THP split logic to vmscan
2017-07-06 16:24:31 -07:00
mm, THP, swap: delay splitting THP during swap out
2017-07-06 16:24:31 -07:00
Merge branch 'misc.compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-07-06 20:57:13 -07:00
time: Clean up CLOCK_MONOTONIC_RAW time handling
2017-06-20 22:13:59 -07:00
tracing: Add support for recording tgid of tasks
2017-06-27 13:30:28 -04:00
TTY/Serial patches for 4.13-rc1
2017-07-03 20:04:16 -07:00
arm64 updates for 4.13:
2017-07-05 17:09:27 -07:00
gcc-plugins: Add the randstruct plugin
2017-06-22 16:15:45 -07:00
sched/wait: Rename wait_queue_t => wait_queue_entry_t
2017-06-20 12:18:27 +02:00
mm/oom_kill: count global and memory cgroup oom kills
2017-07-06 16:24:35 -07:00
mm: memcontrol: per-lruvec stats infrastructure
2017-07-06 16:24:35 -07:00
sched/wait: Disambiguate wq_entry->task_list and wq_head->task_list naming
2017-06-20 12:19:14 +02:00
sched/wait: Disambiguate wq_entry->task_list and wq_head->task_list naming
2017-06-20 12:19:14 +02:00
