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Commit 3526dd0c authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'for-4.17/block-20180402' of git://git.kernel.dk/linux-block 

Pull block layer updates from Jens Axboe:
 "It's a pretty quiet round this time, which is nice. This contains:

   - series from Bart, cleaning up the way we set/test/clear atomic
     queue flags.

   - series from Bart, fixing races between gendisk and queue
     registration and removal.

   - set of bcache fixes and improvements from various folks, by way of
     Michael Lyle.

   - set of lightnvm updates from Matias, most of it being the 1.2 to
     2.0 transition.

   - removal of unused DIO flags from Nikolay.

   - blk-mq/sbitmap memory ordering fixes from Omar.

   - divide-by-zero fix for BFQ from Paolo.

   - minor documentation patches from Randy.

   - timeout fix from Tejun.

   - Alpha "can't write a char atomically" fix from Mikulas.

   - set of NVMe fixes by way of Keith.

   - bsg and bsg-lib improvements from Christoph.

   - a few sed-opal fixes from Jonas.

   - cdrom check-disk-change deadlock fix from Maurizio.

   - various little fixes, comment fixes, etc from various folks"

* tag 'for-4.17/block-20180402' of git://git.kernel.dk/linux-block: (139 commits)
  blk-mq: Directly schedule q->timeout_work when aborting a request
  blktrace: fix comment in blktrace_api.h
  lightnvm: remove function name in strings
  lightnvm: pblk: remove some unnecessary NULL checks
  lightnvm: pblk: don't recover unwritten lines
  lightnvm: pblk: implement 2.0 support
  lightnvm: pblk: implement get log report chunk
  lightnvm: pblk: rename ppaf* to addrf*
  lightnvm: pblk: check for supported version
  lightnvm: implement get log report chunk helpers
  lightnvm: make address conversions depend on generic device
  lightnvm: add support for 2.0 address format
  lightnvm: normalize geometry nomenclature
  lightnvm: complete geo structure with maxoc*
  lightnvm: add shorten OCSSD version in geo
  lightnvm: add minor version to generic geometry
  lightnvm: simplify geometry structure
  lightnvm: pblk: refactor init/exit sequences
  lightnvm: Avoid validation of default op value
  lightnvm: centralize permission check for lightnvm ioctl
  ...
parents dd972f92 bc6d65e6

Documentation/cdrom/cdrom-standard.tex

+21 −10
Original line number Diff line number Diff line
@@ -234,6 +234,7 @@ struct& cdrom_device_ops\ \{ \hidewidth\cr 
  &int& (* open)(struct\ cdrom_device_info *, int)\cr

  &void& (* release)(struct\ cdrom_device_info *);\cr 

  &int& (* drive_status)(struct\ cdrom_device_info *, int);\cr     

  &unsigned\ int& (* check_events)(struct\ cdrom_device_info *, unsigned\ int, int);\cr

  &int& (* media_changed)(struct\ cdrom_device_info *, int);\cr 

  &int& (* tray_move)(struct\ cdrom_device_info *, int);\cr

  &int& (* lock_door)(struct\ cdrom_device_info *, int);\cr
@@ -245,10 +246,9 @@ struct& cdrom_device_ops\ \{ \hidewidth\cr 
  &int& (* reset)(struct\ cdrom_device_info *);\cr

  &int& (* audio_ioctl)(struct\ cdrom_device_info *, unsigned\ int, 

        void *{});\cr 

  &int& (* dev_ioctl)(struct\ cdrom_device_info *, unsigned\ int, 

        unsigned\ long);\cr

\noalign{\medskip}

  &const\ int& capability;& capability flags \cr

  &int& (* generic_packet)(struct\ cdrom_device_info *, struct\ packet_command *{});\cr

\};\cr

}

$$
@@ -274,19 +274,32 @@ $$ 
\halign{$#$\ \hfil&$#$\ \hfil&\hbox to 10em{$#$\hss}&

  $/*$ \rm# $*/$\hfil\cr

struct& cdrom_device_info\ \{ \hidewidth\cr

  & struct\ cdrom_device_ops *& ops;& device operations for this major\cr

  & struct\ cdrom_device_info *& next;& next device_info for this major\cr

  & const\ struct\ cdrom_device_ops *& ops;& device operations for this major\cr

  & struct\ list_head& list;& linked list of all device_info\cr

  & struct\ gendisk *& disk;& matching block layer disk\cr

  & void *&  handle;& driver-dependent data\cr

\noalign{\medskip}

  & kdev_t&  dev;& device number (incorporates minor)\cr

  & int& mask;& mask of capability: disables them \cr

  & int& speed;& maximum speed for reading data \cr

  & int& capacity;& number of discs in a jukebox \cr

\noalign{\medskip}

  &int& options : 30;& options flags \cr

  &unsigned\ int& options : 30;& options flags \cr

  &unsigned& mc_flags : 2;& media-change buffer flags \cr

  &unsigned\ int& vfs_events;& cached events for vfs path\cr

  &unsigned\ int& ioctl_events;& cached events for ioctl path\cr

  & int& use_count;& number of times device is opened\cr

  & char& name[20];& name of the device type\cr

\noalign{\medskip}

  &__u8& sanyo_slot : 2;& Sanyo 3-CD changer support\cr

  &__u8& keeplocked : 1;& CDROM_LOCKDOOR status\cr

  &__u8& reserved : 5;& not used yet\cr

  & int& cdda_method;& see CDDA_* flags\cr

  &__u8& last_sense;& saves last sense key\cr

  &__u8& media_written;& dirty flag, DVD+RW bookkeeping\cr

  &unsigned\ short& mmc3_profile;& current MMC3 profile\cr

  & int& for_data;& unknown:TBD\cr

  & int\ (* exit)\ (struct\ cdrom_device_info *);&& unknown:TBD\cr

  & int& mrw_mode_page;& which MRW mode page is in use\cr

\}\cr

}$$

Using this $struct$, a linked list of the registered minor devices is
@@ -298,9 +311,7 @@ The $mask$ flags can be used to mask out some of the capabilities listed 
in $ops\to capability$, if a specific drive doesn't support a feature

of the driver. The value $speed$ specifies the maximum head-rate of the

drive, measured in units of normal audio speed (176\,kB/sec raw data or

150\,kB/sec file system data). The value $n_discs$ should reflect the

number of discs the drive can hold simultaneously, if it is designed

as a juke-box, or otherwise~1. The parameters are declared $const$

150\,kB/sec file system data).  The parameters are declared $const$

because they describe properties of the drive, which don't change after

registration.
@@ -1002,7 +1013,7 @@ taken over the torch in maintaining \cdromc\ and integrating much 
\cdrom-related code in the 2.1-kernel.  Thanks to Scott Snyder and

Gerd Knorr, who were the first to implement this interface for SCSI

and IDE-CD drivers and added many ideas for extension of the data

structures relative to kernel~2.0.  Further thanks to Heiko Ei{\sz}feldt,

structures relative to kernel~2.0.  Further thanks to Heiko Ei{\ss}feldt,

Thomas Quinot, Jon Tombs, Ken Pizzini, Eberhard M\"onkeberg and Andrew

Kroll, the \linux\ \cdrom\ device driver developers who were kind

enough to give suggestions and criticisms during the writing. Finally

Documentation/fault-injection/fault-injection.txt

+8 −0
Original line number Diff line number Diff line
@@ -36,6 +36,14 @@ o fail_function 
  ALLOW_ERROR_INJECTION() macro, by setting debugfs entries

  under /sys/kernel/debug/fail_function. No boot option supported.



o NVMe fault injection



  inject NVMe status code and retry flag on devices permitted by setting

  debugfs entries under /sys/kernel/debug/nvme*/fault_inject. The default

  status code is NVME_SC_INVALID_OPCODE with no retry. The status code and

  retry flag can be set via the debugfs.





Configure fault-injection capabilities behavior

-----------------------------------------------

Documentation/fault-injection/nvme-fault-injection.txt

0 → 100644
+116 −0
Original line number Diff line number Diff line 
NVMe Fault Injection

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

Linux's fault injection framework provides a systematic way to support

error injection via debugfs in the /sys/kernel/debug directory. When

enabled, the default NVME_SC_INVALID_OPCODE with no retry will be

injected into the nvme_end_request. Users can change the default status

code and no retry flag via the debugfs. The list of Generic Command

Status can be found in include/linux/nvme.h



Following examples show how to inject an error into the nvme.



First, enable CONFIG_FAULT_INJECTION_DEBUG_FS kernel config,

recompile the kernel. After booting up the kernel, do the

following.



Example 1: Inject default status code with no retry

---------------------------------------------------



mount /dev/nvme0n1 /mnt

echo 1 > /sys/kernel/debug/nvme0n1/fault_inject/times

echo 100 > /sys/kernel/debug/nvme0n1/fault_inject/probability

cp a.file /mnt



Expected Result:



cp: cannot stat ‘/mnt/a.file’: Input/output error



Message from dmesg:



FAULT_INJECTION: forcing a failure.

name fault_inject, interval 1, probability 100, space 0, times 1

CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.15.0-rc8+ #2

Hardware name: innotek GmbH VirtualBox/VirtualBox,

BIOS VirtualBox 12/01/2006

Call Trace:

  <IRQ>

  dump_stack+0x5c/0x7d

  should_fail+0x148/0x170

  nvme_should_fail+0x2f/0x50 [nvme_core]

  nvme_process_cq+0xe7/0x1d0 [nvme]

  nvme_irq+0x1e/0x40 [nvme]

  __handle_irq_event_percpu+0x3a/0x190

  handle_irq_event_percpu+0x30/0x70

  handle_irq_event+0x36/0x60

  handle_fasteoi_irq+0x78/0x120

  handle_irq+0xa7/0x130

  ? tick_irq_enter+0xa8/0xc0

  do_IRQ+0x43/0xc0

  common_interrupt+0xa2/0xa2

  </IRQ>

RIP: 0010:native_safe_halt+0x2/0x10

RSP: 0018:ffffffff82003e90 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffdd

RAX: ffffffff817a10c0 RBX: ffffffff82012480 RCX: 0000000000000000

RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000

RBP: 0000000000000000 R08: 000000008e38ce64 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff82012480

R13: ffffffff82012480 R14: 0000000000000000 R15: 0000000000000000

  ? __sched_text_end+0x4/0x4

  default_idle+0x18/0xf0

  do_idle+0x150/0x1d0

  cpu_startup_entry+0x6f/0x80

  start_kernel+0x4c4/0x4e4

  ? set_init_arg+0x55/0x55

  secondary_startup_64+0xa5/0xb0

  print_req_error: I/O error, dev nvme0n1, sector 9240

EXT4-fs error (device nvme0n1): ext4_find_entry:1436:

inode #2: comm cp: reading directory lblock 0



Example 2: Inject default status code with retry

------------------------------------------------



mount /dev/nvme0n1 /mnt

echo 1 > /sys/kernel/debug/nvme0n1/fault_inject/times

echo 100 > /sys/kernel/debug/nvme0n1/fault_inject/probability

echo 1 > /sys/kernel/debug/nvme0n1/fault_inject/status

echo 0 > /sys/kernel/debug/nvme0n1/fault_inject/dont_retry



cp a.file /mnt



Expected Result:



command success without error



Message from dmesg:



FAULT_INJECTION: forcing a failure.

name fault_inject, interval 1, probability 100, space 0, times 1

CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.15.0-rc8+ #4

Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006

Call Trace:

  <IRQ>

  dump_stack+0x5c/0x7d

  should_fail+0x148/0x170

  nvme_should_fail+0x30/0x60 [nvme_core]

  nvme_loop_queue_response+0x84/0x110 [nvme_loop]

  nvmet_req_complete+0x11/0x40 [nvmet]

  nvmet_bio_done+0x28/0x40 [nvmet]

  blk_update_request+0xb0/0x310

  blk_mq_end_request+0x18/0x60

  flush_smp_call_function_queue+0x3d/0xf0

  smp_call_function_single_interrupt+0x2c/0xc0

  call_function_single_interrupt+0xa2/0xb0

  </IRQ>

RIP: 0010:native_safe_halt+0x2/0x10

RSP: 0018:ffffc9000068bec0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff04

RAX: ffffffff817a10c0 RBX: ffff88011a3c9680 RCX: 0000000000000000

RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000

RBP: 0000000000000001 R08: 000000008e38c131 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000000 R12: ffff88011a3c9680

R13: ffff88011a3c9680 R14: 0000000000000000 R15: 0000000000000000

  ? __sched_text_end+0x4/0x4

  default_idle+0x18/0xf0

  do_idle+0x150/0x1d0

  cpu_startup_entry+0x6f/0x80

  start_secondary+0x187/0x1e0

  secondary_startup_64+0xa5/0xb0

MAINTAINERS

+1 −0
Original line number Diff line number Diff line
@@ -2646,6 +2646,7 @@ L: linux-block@vger.kernel.org 
T:	git git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git

S:	Maintained

F:	block/

F:	drivers/block/

F:	kernel/trace/blktrace.c

F:	lib/sbitmap.c

arch/xtensa/platforms/iss/simdisk.c

+0 −1
Original line number Diff line number Diff line
@@ -21,7 +21,6 @@ 
#include <platform/simcall.h>



#define SIMDISK_MAJOR 240

#define SECTOR_SHIFT 9

#define SIMDISK_MINORS 1

#define MAX_SIMDISK_COUNT 10