03 Sep, 2019
1 commit
-
We want to throw out the attrbute if it refers to the mounted on fileid,
and not the real fileid. However we do not want to block cache consistency
updates from NFSv4 writes.Reported-by: Murphy Zhou
Fixes: 7e10cc25bfa0 ("NFS: Don't refresh attributes with mounted-on-file...")
Signed-off-by: Trond Myklebust
30 Aug, 2019
1 commit
-
Pull cifs fixes from Steve French:
"A few small SMB3 fixes, and a larger one to fix various older string
handling functions"* tag '5.3-rc6-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6:
cifs: update internal module number
cifs: replace various strncpy with strscpy and similar
cifs: Use kzfree() to zero out the password
cifs: set domainName when a domain-key is used in multiuser
28 Aug, 2019
5 commits
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To 2.22
Signed-off-by: Steve French
-
Using strscpy is cleaner, and avoids some problems with
handling maximum length strings. Linus noticed the
original problem and Aurelien pointed out some additional
problems. Fortunately most of this is SMB1 code (and
in particular the ASCII string handling older, which
is less common).Reported-by: Linus Torvalds
Reviewed-by: Aurelien Aptel
Signed-off-by: Ronnie Sahlberg
Signed-off-by: Steve French -
It's safer to zero out the password so that it can never be disclosed.
Fixes: 0c219f5799c7 ("cifs: set domainName when a domain-key is used in multiuser")
Signed-off-by: Dan Carpenter
Signed-off-by: Steve French -
RHBZ: 1710429
When we use a domain-key to authenticate using multiuser we must also set
the domainnmame for the new volume as it will be used and passed to the server
in the NTLMSSP Domain-name.Signed-off-by: Ronnie Sahlberg
Signed-off-by: Steve French -
Pull NFS client bugfixes from Trond Myklebust:
"Highlights include:Stable fixes:
- Fix a page lock leak in nfs_pageio_resend()
- Ensure O_DIRECT reports an error if the bytes read/written is 0
- Don't handle errors if the bind/connect succeeded
- Revert "NFSv4/flexfiles: Abort I/O early if the layout segment was
invalidat ed"Bugfixes:
- Don't refresh attributes with mounted-on-file information
- Fix return values for nfs4_file_open() and nfs_finish_open()
- Fix pnfs layoutstats reporting of I/O errors
- Don't use soft RPC calls for pNFS/flexfiles I/O, and don't abort
for soft I/O errors when the user specifies a hard mount.- Various fixes to the error handling in sunrpc
- Don't report writepage()/writepages() errors twice"
* tag 'nfs-for-5.3-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
NFS: remove set but not used variable 'mapping'
NFSv2: Fix write regression
NFSv2: Fix eof handling
NFS: Fix writepage(s) error handling to not report errors twice
NFS: Fix spurious EIO read errors
pNFS/flexfiles: Don't time out requests on hard mounts
SUNRPC: Handle connection breakages correctly in call_status()
Revert "NFSv4/flexfiles: Abort I/O early if the layout segment was invalidated"
SUNRPC: Handle EADDRINUSE and ENOBUFS correctly
pNFS/flexfiles: Turn off soft RPC calls
SUNRPC: Don't handle errors if the bind/connect succeeded
NFS: On fatal writeback errors, we need to call nfs_inode_remove_request()
NFS: Fix initialisation of I/O result struct in nfs_pgio_rpcsetup
NFS: Ensure O_DIRECT reports an error if the bytes read/written is 0
NFSv4/pnfs: Fix a page lock leak in nfs_pageio_resend()
NFSv4: Fix return value in nfs_finish_open()
NFSv4: Fix return values for nfs4_file_open()
NFS: Don't refresh attributes with mounted-on-file information
27 Aug, 2019
8 commits
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Fixes gcc '-Wunused-but-set-variable' warning:
fs/nfs/write.c: In function nfs_page_async_flush:
fs/nfs/write.c:609:24: warning: variable mapping set but not used [-Wunused-but-set-variable]It is not use since commit aefb623c422e ("NFS: Fix
writepage(s) error handling to not report errors twice")Reported-by: Hulk Robot
Signed-off-by: YueHaibing
Signed-off-by: Trond Myklebust -
Ensure we update the write result count on success, since the
RPC call itself does not do so.Reported-by: Jan Stancek
Reported-by: Naresh Kamboju
Signed-off-by: Trond Myklebust
Tested-by: Jan Stancek -
If we received a reply from the server with a zero length read and
no error, then that implies we are at eof.Signed-off-by: Trond Myklebust
-
If writepage()/writepages() saw an error, but handled it without
reporting it, we should not be re-reporting that error on exit.Signed-off-by: Trond Myklebust
-
If the client attempts to read a page, but the read fails due to some
spurious error (e.g. an ACCESS error or a timeout, ...) then we need
to allow other processes to retry.
Also try to report errors correctly when doing a synchronous readpage.Signed-off-by: Trond Myklebust
-
If the mount is hard, we should ignore the 'io_maxretrans' module
parameter so that we always keep retrying.Signed-off-by: Trond Myklebust
-
This reverts commit a79f194aa4879e9baad118c3f8bb2ca24dbef765.
The mechanism for aborting I/O is racy, since we are not guaranteed that
the request is asleep while we're changing both task->tk_status and
task->tk_action.Signed-off-by: Trond Myklebust
Cc: stable@vger.kernel.org # v5.1 -
The pNFS/flexfiles I/O requests are sent with the SOFTCONN flag set, so
they automatically time out if the connection breaks. It should
therefore not be necessary to have the soft flag set in addition.Fixes: 5f01d9539496 ("nfs41: create NFSv3 DS connection if specified")
Signed-off-by: Trond Myklebust
26 Aug, 2019
1 commit
-
Pull UBIFS and JFFS2 fixes from Richard Weinberger:
"UBIFS:
- Don't block too long in writeback_inodes_sb()
- Fix for a possible overrun of the log head
- Fix double unlock in orphan_delete()JFFS2:
- Remove C++ style from UAPI header and unbreak picky toolchains"* tag 'for-linus-5.3-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/ubifs:
ubifs: Limit the number of pages in shrink_liability
ubifs: Correctly initialize c->min_log_bytes
ubifs: Fix double unlock around orphan_delete()
jffs2: Remove C++ style comments from uapi header
25 Aug, 2019
2 commits
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userfaultfd_release() should clear vm_flags/vm_userfaultfd_ctx even if
mm->core_state != NULL.Otherwise a page fault can see userfaultfd_missing() == T and use an
already freed userfaultfd_ctx.Link: http://lkml.kernel.org/r/20190820160237.GB4983@redhat.com
Fixes: 04f5866e41fb ("coredump: fix race condition between mmget_not_zero()/get_task_mm() and core dumping")
Signed-off-by: Oleg Nesterov
Reported-by: Kefeng Wang
Reviewed-by: Andrea Arcangeli
Tested-by: Kefeng Wang
Cc: Peter Xu
Cc: Mike Rapoport
Cc: Jann Horn
Cc: Jason Gunthorpe
Cc: Michal Hocko
Cc: Tetsuo Handa
Cc:
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Pull xfs fix from Darrick Wong:
"A single patch that fixes a xfs lockup problem when a chown/chgrp
operation fails due to running out of quota. It has survived the usual
xfstests runs and merges cleanly with this morning's master:- Fix a forgotten inode unlock when chown/chgrp fail due to quota"
* tag 'xfs-5.3-fixes-6' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
xfs: fix missing ILOCK unlock when xfs_setattr_nonsize fails due to EDQUOT
24 Aug, 2019
3 commits
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Pull block fixes from Jens Axboe:
"Here's a set of fixes that should go into this release. This contains:- Three minor fixes for NVMe.
- Three minor tweaks for the io_uring polling logic.
- Officially mark Song as the MD maintainer, after he's been filling
that role sucessfully for the last 6 months or so"* tag 'for-linus-20190823' of git://git.kernel.dk/linux-block:
io_uring: add need_resched() check in inner poll loop
md: update MAINTAINERS info
io_uring: don't enter poll loop if we have CQEs pending
nvme: Add quirk for LiteON CL1 devices running FW 22301111
nvme: Fix cntlid validation when not using NVMEoF
nvme-multipath: fix possible I/O hang when paths are updated
io_uring: fix potential hang with polled IO -
Pull xfs fixes from Darrick Wong:
"Here are a few more bug fixes that trickled in since the last pull.
They've survived the usual xfstests runs and merge cleanly with this
morning's master.I expect there to be one more pull request tomorrow for the fix to
that quota related inode unlock bug that we were reviewing last night,
but it will continue to soak in the testing machine for several more
hours.- Fix missing compat ioctl handling for get/setlabel
- Fix missing ioctl pointer sanitization on s390
- Fix a page locking deadlock in the dedupe comparison code
- Fix inadequate locking in reflink code w.r.t. concurrent directio
- Fix broken error detection when breaking layouts"
* tag 'xfs-5.3-fixes-4' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
fs/xfs: Fix return code of xfs_break_leased_layouts()
xfs: fix reflink source file racing with directio writes
vfs: fix page locking deadlocks when deduping files
xfs: compat_ioctl: use compat_ptr()
xfs: fall back to native ioctls for unhandled compat ones -
Pull ceph fixes from Ilya Dryomov:
"Three important fixes tagged for stable (an indefinite hang, a crash
on an assert and a NULL pointer dereference) plus a small series from
Luis fixing instances of vfree() under spinlock"* tag 'ceph-for-5.3-rc6' of git://github.com/ceph/ceph-client:
libceph: fix PG split vs OSD (re)connect race
ceph: don't try fill file_lock on unsuccessful GETFILELOCK reply
ceph: clear page dirty before invalidate page
ceph: fix buffer free while holding i_ceph_lock in fill_inode()
ceph: fix buffer free while holding i_ceph_lock in __ceph_build_xattrs_blob()
ceph: fix buffer free while holding i_ceph_lock in __ceph_setxattr()
libceph: allow ceph_buffer_put() to receive a NULL ceph_buffer
23 Aug, 2019
3 commits
-
Benjamin Moody reported to Debian that XFS partially wedges when a chgrp
fails on account of being out of disk quota. I ran his reproducer
script:# adduser dummy
# adduser dummy plugdev# dd if=/dev/zero bs=1M count=100 of=test.img
# mkfs.xfs test.img
# mount -t xfs -o gquota test.img /mnt
# mkdir -p /mnt/dummy
# chown -c dummy /mnt/dummy
# xfs_quota -xc 'limit -g bsoft=100k bhard=100k plugdev' /mnt(and then as user dummy)
$ dd if=/dev/urandom bs=1M count=50 of=/mnt/dummy/foo
$ chgrp plugdev /mnt/dummy/fooand saw:
================================================
WARNING: lock held when returning to user space!
5.3.0-rc5 #rc5 Tainted: G W
------------------------------------------------
chgrp/47006 is leaving the kernel with locks still held!
1 lock held by chgrp/47006:
#0: 000000006664ea2d (&xfs_nondir_ilock_class){++++}, at: xfs_ilock+0xd2/0x290 [xfs]...which is clearly caused by xfs_setattr_nonsize failing to unlock the
ILOCK after the xfs_qm_vop_chown_reserve call fails. Add the missing
unlock.Reported-by: benjamin.moody@gmail.com
Fixes: 253f4911f297 ("xfs: better xfs_trans_alloc interface")
Signed-off-by: Darrick J. Wong
Reviewed-by: Dave Chinner
Tested-by: Salvatore Bonaccorso -
The outer poll loop checks for whether we need to reschedule, and
returns to userspace if we do. However, it's possible to get stuck
in the inner loop as well, if the CPU we are running on needs to
reschedule to finish the IO work.Add the need_resched() check in the inner loop as well. This fixes
a potential hang if the kernel is configured with
CONFIG_PREEMPT_VOLUNTARY=y.Reported-by: Sagi Grimberg
Reviewed-by: Sagi Grimberg
Tested-by: Sagi Grimberg
Signed-off-by: Jens Axboe -
Pull AFS fixes from David Howells:
- Fix a cell record leak due to the default error not being cleared.
- Fix an oops in tracepoint due to a pointer that may contain an error.
- Fix the ACL storage op for YFS where the wrong op definition is being
used. By luck, this only actually affects the information appearing
in traces.* tag 'afs-fixes-20190822' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
afs: use correct afs_call_type in yfs_fs_store_opaque_acl2
afs: Fix possible oops in afs_lookup trace event
afs: Fix leak in afs_lookup_cell_rcu()
22 Aug, 2019
12 commits
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If the number of dirty pages to be written back is large,
then writeback_inodes_sb will block waiting for a long time,
causing hung task detection alarm. Therefore, we should limit
the maximum number of pages written back this time, which let
the budget be completed faster. The remaining dirty pages
tend to rely on the writeback mechanism to complete the
synchronization.Fixes: b6e51316daed ("writeback: separate starting of sync vs opportunistic writeback")
Signed-off-by: Liu Song
Signed-off-by: Richard Weinberger -
Currently on a freshly mounted UBIFS, c->min_log_bytes is 0.
This can lead to a log overrun and make commits fail.Recent kernels will report the following assert:
UBIFS assert failed: c->lhead_lnum != c->ltail_lnum, in fs/ubifs/log.c:412c->min_log_bytes can have two states, 0 and c->leb_size.
It controls how much bytes of the log area are reserved for non-bud
nodes such as commit nodes.After a commit it has to be set to c->leb_size such that we have always
enough space for a commit. While a commit runs it can be 0 to make the
remaining bytes of the log available to writers.Having it set to 0 right after mount is wrong since no space for commits
is reserved.Fixes: 1e51764a3c2ac ("UBIFS: add new flash file system")
Reported-and-tested-by: Uwe Kleine-König
Signed-off-by: Richard Weinberger -
We unlock after orphan_delete(), so no need to unlock
in the function too.Reported-by: Han Xu
Fixes: 8009ce956c3d ("ubifs: Don't leak orphans on memory during commit")
Signed-off-by: Richard Weinberger -
It seems that 'yfs_RXYFSStoreOpaqueACL2' should be use in
yfs_fs_store_opaque_acl2().Fixes: f5e4546347bc ("afs: Implement YFS ACL setting")
Signed-off-by: YueHaibing
Signed-off-by: David Howells -
The afs_lookup trace event can cause the following:
[ 216.576777] BUG: kernel NULL pointer dereference, address: 000000000000023b
[ 216.576803] #PF: supervisor read access in kernel mode
[ 216.576813] #PF: error_code(0x0000) - not-present page
...
[ 216.576913] RIP: 0010:trace_event_raw_event_afs_lookup+0x9e/0x1c0 [kafs]If the inode from afs_do_lookup() is an error other than ENOENT, or if it
is ENOENT and afs_try_auto_mntpt() returns an error, the trace event will
try to dereference the error pointer as a valid pointer.Use IS_ERR_OR_NULL to only pass a valid pointer for the trace, or NULL.
Ideally the trace would include the error value, but for now just avoid
the oops.Fixes: 80548b03991f ("afs: Add more tracepoints")
Signed-off-by: Marc Dionne
Signed-off-by: David Howells -
Fix a leak on the cell refcount in afs_lookup_cell_rcu() due to
non-clearance of the default error in the case a NULL cell name is passed
and the workstation default cell is used.Also put a bit at the end to make sure we don't leak a cell ref if we're
going to be returning an error.This leak results in an assertion like the following when the kafs module is
unloaded:AFS: Assertion failed
2 == 1 is false
0x2 == 0x1 is false
------------[ cut here ]------------
kernel BUG at fs/afs/cell.c:770!
...
RIP: 0010:afs_manage_cells+0x220/0x42f [kafs]
...
process_one_work+0x4c2/0x82c
? pool_mayday_timeout+0x1e1/0x1e1
? do_raw_spin_lock+0x134/0x175
worker_thread+0x336/0x4a6
? rescuer_thread+0x4af/0x4af
kthread+0x1de/0x1ee
? kthread_park+0xd4/0xd4
ret_from_fork+0x24/0x30Fixes: 989782dcdc91 ("afs: Overhaul cell database management")
Signed-off-by: David Howells -
When ceph_mdsc_do_request returns an error, we can't assume that the
filelock_reply pointer will be set. Only try to fetch fields out of
the r_reply_info when it returns success.Cc: stable@vger.kernel.org
Reported-by: Hector Martin
Signed-off-by: Jeff Layton
Reviewed-by: "Yan, Zheng"
Signed-off-by: Ilya Dryomov -
clear_page_dirty_for_io(page) before mapping->a_ops->invalidatepage().
invalidatepage() clears page's private flag, if dirty flag is not
cleared, the page may cause BUG_ON failure in ceph_set_page_dirty().Cc: stable@vger.kernel.org
Link: https://tracker.ceph.com/issues/40862
Signed-off-by: Erqi Chen
Reviewed-by: Jeff Layton
Signed-off-by: Ilya Dryomov -
Calling ceph_buffer_put() in fill_inode() may result in freeing the
i_xattrs.blob buffer while holding the i_ceph_lock. This can be fixed by
postponing the call until later, when the lock is released.The following backtrace was triggered by fstests generic/070.
BUG: sleeping function called from invalid context at mm/vmalloc.c:2283
in_atomic(): 1, irqs_disabled(): 0, pid: 3852, name: kworker/0:4
6 locks held by kworker/0:4/3852:
#0: 000000004270f6bb ((wq_completion)ceph-msgr){+.+.}, at: process_one_work+0x1b8/0x5f0
#1: 00000000eb420803 ((work_completion)(&(&con->work)->work)){+.+.}, at: process_one_work+0x1b8/0x5f0
#2: 00000000be1c53a4 (&s->s_mutex){+.+.}, at: dispatch+0x288/0x1476
#3: 00000000559cb958 (&mdsc->snap_rwsem){++++}, at: dispatch+0x2eb/0x1476
#4: 000000000d5ebbae (&req->r_fill_mutex){+.+.}, at: dispatch+0x2fc/0x1476
#5: 00000000a83d0514 (&(&ci->i_ceph_lock)->rlock){+.+.}, at: fill_inode.isra.0+0xf8/0xf70
CPU: 0 PID: 3852 Comm: kworker/0:4 Not tainted 5.2.0+ #441
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58-prebuilt.qemu.org 04/01/2014
Workqueue: ceph-msgr ceph_con_workfn
Call Trace:
dump_stack+0x67/0x90
___might_sleep.cold+0x9f/0xb1
vfree+0x4b/0x60
ceph_buffer_release+0x1b/0x60
fill_inode.isra.0+0xa9b/0xf70
ceph_fill_trace+0x13b/0xc70
? dispatch+0x2eb/0x1476
dispatch+0x320/0x1476
? __mutex_unlock_slowpath+0x4d/0x2a0
ceph_con_workfn+0xc97/0x2ec0
? process_one_work+0x1b8/0x5f0
process_one_work+0x244/0x5f0
worker_thread+0x4d/0x3e0
kthread+0x105/0x140
? process_one_work+0x5f0/0x5f0
? kthread_park+0x90/0x90
ret_from_fork+0x3a/0x50Signed-off-by: Luis Henriques
Reviewed-by: Jeff Layton
Signed-off-by: Ilya Dryomov -
Calling ceph_buffer_put() in __ceph_build_xattrs_blob() may result in
freeing the i_xattrs.blob buffer while holding the i_ceph_lock. This can
be fixed by having this function returning the old blob buffer and have
the callers of this function freeing it when the lock is released.The following backtrace was triggered by fstests generic/117.
BUG: sleeping function called from invalid context at mm/vmalloc.c:2283
in_atomic(): 1, irqs_disabled(): 0, pid: 649, name: fsstress
4 locks held by fsstress/649:
#0: 00000000a7478e7e (&type->s_umount_key#19){++++}, at: iterate_supers+0x77/0xf0
#1: 00000000f8de1423 (&(&ci->i_ceph_lock)->rlock){+.+.}, at: ceph_check_caps+0x7b/0xc60
#2: 00000000562f2b27 (&s->s_mutex){+.+.}, at: ceph_check_caps+0x3bd/0xc60
#3: 00000000f83ce16a (&mdsc->snap_rwsem){++++}, at: ceph_check_caps+0x3ed/0xc60
CPU: 1 PID: 649 Comm: fsstress Not tainted 5.2.0+ #439
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58-prebuilt.qemu.org 04/01/2014
Call Trace:
dump_stack+0x67/0x90
___might_sleep.cold+0x9f/0xb1
vfree+0x4b/0x60
ceph_buffer_release+0x1b/0x60
__ceph_build_xattrs_blob+0x12b/0x170
__send_cap+0x302/0x540
? __lock_acquire+0x23c/0x1e40
? __mark_caps_flushing+0x15c/0x280
? _raw_spin_unlock+0x24/0x30
ceph_check_caps+0x5f0/0xc60
ceph_flush_dirty_caps+0x7c/0x150
? __ia32_sys_fdatasync+0x20/0x20
ceph_sync_fs+0x5a/0x130
iterate_supers+0x8f/0xf0
ksys_sync+0x4f/0xb0
__ia32_sys_sync+0xa/0x10
do_syscall_64+0x50/0x1c0
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fc6409ab617Signed-off-by: Luis Henriques
Reviewed-by: Jeff Layton
Signed-off-by: Ilya Dryomov -
Calling ceph_buffer_put() in __ceph_setxattr() may end up freeing the
i_xattrs.prealloc_blob buffer while holding the i_ceph_lock. This can be
fixed by postponing the call until later, when the lock is released.The following backtrace was triggered by fstests generic/117.
BUG: sleeping function called from invalid context at mm/vmalloc.c:2283
in_atomic(): 1, irqs_disabled(): 0, pid: 650, name: fsstress
3 locks held by fsstress/650:
#0: 00000000870a0fe8 (sb_writers#8){.+.+}, at: mnt_want_write+0x20/0x50
#1: 00000000ba0c4c74 (&type->i_mutex_dir_key#6){++++}, at: vfs_setxattr+0x55/0xa0
#2: 000000008dfbb3f2 (&(&ci->i_ceph_lock)->rlock){+.+.}, at: __ceph_setxattr+0x297/0x810
CPU: 1 PID: 650 Comm: fsstress Not tainted 5.2.0+ #437
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58-prebuilt.qemu.org 04/01/2014
Call Trace:
dump_stack+0x67/0x90
___might_sleep.cold+0x9f/0xb1
vfree+0x4b/0x60
ceph_buffer_release+0x1b/0x60
__ceph_setxattr+0x2b4/0x810
__vfs_setxattr+0x66/0x80
__vfs_setxattr_noperm+0x59/0xf0
vfs_setxattr+0x81/0xa0
setxattr+0x115/0x230
? filename_lookup+0xc9/0x140
? rcu_read_lock_sched_held+0x74/0x80
? rcu_sync_lockdep_assert+0x2e/0x60
? __sb_start_write+0x142/0x1a0
? mnt_want_write+0x20/0x50
path_setxattr+0xba/0xd0
__x64_sys_lsetxattr+0x24/0x30
do_syscall_64+0x50/0x1c0
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7ff23514359aSigned-off-by: Luis Henriques
Reviewed-by: Jeff Layton
Signed-off-by: Ilya Dryomov -
Pull nfsd fixes from Bruce Fields:
"Fix nfsd bugs: three in the new nfsd/clients/ code, one in the reply
cache containerization"* tag 'nfsd-5.3-1' of git://linux-nfs.org/~bfields/linux:
nfsd4: Fix kernel crash when reading proc file reply_cache_stats
nfsd: initialize i_private before d_add
nfsd: use i_wrlock instead of rcu for nfsdfs i_private
nfsd: fix dentry leak upon mkdir failure.
21 Aug, 2019
2 commits
-
We need to check if we have CQEs pending before starting a poll loop,
as those could be the events we will be spinning for (and hence we'll
find none). This can happen if a CQE triggers an error, or if it is
found by eg an IRQ before we get a chance to find it through polling.Signed-off-by: Jens Axboe
-
If a request issue ends up being punted to async context to avoid
blocking, we can get into a situation where the original application
enters the poll loop for that very request before it has been issued.
This should not be an issue, except that the polling will hold the
io_uring uring_ctx mutex for the duration of the poll. When the async
worker has actually issued the request, it needs to acquire this mutex
to add the request to the poll issued list. Since the application
polling is already holding this mutex, the workqueue sleeps on the
mutex forever, and the application thus never gets a chance to poll for
the very request it was interested in.Fix this by ensuring that the polling drops the uring_ctx occasionally
if it's not making any progress.Reported-by: Jeffrey M. Birnbaum
Signed-off-by: Jens Axboe
20 Aug, 2019
2 commits
-
The parens used in the while loop would result in error being assigned
the value 1 rather than the intended errno value.This is required to return -ETXTBSY from follow on break_layout()
changes.Signed-off-by: Ira Weiny
Reviewed-by: Darrick J. Wong
Signed-off-by: Darrick J. Wong -
…iederm/user-namespace
Pull kernel thread signal handling fix from Eric Biederman:
"I overlooked the fact that kernel threads are created with all signals
set to SIG_IGN, and accidentally caused a regression in cifs and drbd
when replacing force_sig with send_sig.This is my fix for that regression. I add a new function
allow_kernel_signal which allows kernel threads to receive signals
sent from the kernel, but continues to ignore all signals sent from
userspace. This ensures the user space interface for cifs and drbd
remain the same.These kernel threads depend on blocking networking calls which block
until something is received or a signal is pending. Making receiving
of signals somewhat necessary for these kernel threads.Perhaps someday we can cleanup those interfaces and remove
allow_kernel_signal. If not allow_kernel_signal is pretty trivial and
clearly documents what is going on so I don't think we will mind
carrying it"* 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
signal: Allow cifs and drbd to receive their terminating signals
