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Paolo Bonzini ca44148041 qemu-nbd: only send a limited number of errno codes on the wire 
Right now, NBD includes potentially platform-specific error values in
the wire protocol.

Luckily, most common error values are more or less universal: in
particular, of all errno values <= 34 (up to ERANGE), they are all the
same on supported platforms except for 11 (which is EAGAIN on Windows and
Linux, but EDEADLK on Darwin and the *BSDs).  So, in order to guarantee
some portability, only keep a handful of possible error codes and squash
everything else to EINVAL.

This patch defines a limited set of errno values that are valid for the
NBD protocol, and specifies recommendations for what error to return
in specific corner cases.  The set of errno values is roughly based on
the errors listed in the read(2) and write(2) man pages, with some
exceptions:

- ENOMEM is added for servers that implement copy-on-write or other
  formats that require dynamic allocation.

- EDQUOT is not part of the universal set of errors; it can be changed
  to ENOSPC on the wire format.

- EFBIG is part of the universal set of errors, but it is also changed
  to ENOSPC because it is pretty similar to ENOSPC or EDQUOT.

Incoming values will in general match system errno values, but not
on the Hurd which has different errno values (they have a "subsystem
code" equal to 0x10 in bits 24-31).  The Hurd is probably not something
to which QEMU has been ported, but still do the right thing and
reverse-map the NBD errno values to the system errno values.

The corresponding patch to the NBD protocol description can be found at
http://article.gmane.org/gmane.linux.drivers.nbd.general/3154.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2015-05-08 14:45:11 +02:00
audio audio: Don't free hw resources until after hw backend is stopped 2014-12-22 23:12:25 +00:00
backends hostmem: Prevent removing an in-use memory backend 2015-04-01 10:06:38 +02:00
block block: move I/O request processing to block/io.c 2015-04-28 15:36:17 +02:00
bsd-user linux-user, bsd-user: Remove two calls to cpu_exec_init_all 2015-04-27 18:24:17 +02:00
default-configs hw/usb: Include USB files only if necessary 2015-03-18 11:50:47 +01:00
disas cris: remove unused cris_cond15 declarations 2015-03-19 11:11:55 +03:00
docs docs: incremental backup documentation 2015-04-28 15:36:10 +02:00
dtc@bc895d6d09 dtc: add submodule 2013-04-18 13:50:53 +02:00
fpu softfloat: expand out STATUS macro 2015-02-06 16:11:38 +00:00
fsdev Fix typos in comments 2015-03-19 11:30:37 +03:00
gdb-xml s390x/gdb: add the feature xml files for s390x 2014-09-01 09:45:19 +02:00
hw exec: move rcu_read_lock/unlock to address_space_translate callers 2015-04-30 16:55:32 +02:00
include exec: move rcu_read_lock/unlock to address_space_translate callers 2015-04-30 16:55:32 +02:00
libcacard libcacard: stop linking against every single 3rd party library 2015-02-10 09:27:20 +03:00
libdecnumber libdecnumber: Fix warnings from smatch (missing static, boolean operations) 2014-08-24 13:21:06 +04:00
linux-headers linux-headers: update 2015-04-30 13:21:42 +02:00
linux-user linux-user, bsd-user: Remove two calls to cpu_exec_init_all 2015-04-27 18:24:17 +02:00
migration block: Ensure consistent bitmap function prototypes 2015-04-28 15:36:10 +02:00
net net: synchronize net_host_device_remove with host_net_remove_completion 2015-03-12 19:59:39 +00:00
pc-bios pseries: Update SLOF firmware image to qemu-slof-20150313 2015-03-25 22:49:45 +01:00
pixman@87eea99e44 pixman: update internal copy to pixman-0.32.6 2014-09-15 08:14:19 +02:00
po po: fix conflict with %.mo rule in rules.mak 2014-09-26 13:35:08 +02:00
qapi qmp: Add dirty bitmap status field in query-block 2015-04-28 15:36:10 +02:00
qga qga: fitering out -fstack-protector-strong 2015-04-02 15:57:27 +02:00
qobject qjson: Drop trailing space for pretty formatting 2014-12-10 10:25:30 +01:00
qom qom: Add can_be_deleted callback to UserCreatableClass 2015-04-01 10:06:38 +02:00
roms pseries: Update SLOF firmware image to qemu-slof-20150313 2015-03-25 22:49:45 +01:00
scripts iotests: add QMP event waiting queue 2015-04-28 15:36:11 +02:00
slirp slirp: udp: fix NULL pointer dereference because of uninitialized socket 2014-09-23 19:15:05 +01:00
stubs pci, pc, virtio fixes and cleanups 2015-03-09 09:14:28 +00:00
sysconfigs/target
target-alpha tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
target-arm kvm: add support for memory transaction attributes 2015-04-30 16:55:32 +02:00
target-cris cris: remove unused cris_cond15 declarations 2015-03-19 11:11:55 +03:00
target-i386 kvm: add support for memory transaction attributes 2015-04-30 16:55:32 +02:00
target-lm32 tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
target-m68k tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
target-microblaze tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
target-mips kvm: add support for memory transaction attributes 2015-04-30 16:55:32 +02:00
target-moxie target-moxie: Fix warnings from Sparse (one-bit signed bitfield) 2015-03-19 11:11:55 +03:00
target-openrisc tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
target-ppc kvm: add support for memory transaction attributes 2015-04-30 16:55:32 +02:00
target-s390x kvm: add support for memory transaction attributes 2015-04-30 16:55:32 +02:00
target-sh4 tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
target-sparc tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
target-tricore target-tricore: Fix check which was always false 2015-04-04 09:45:59 +03:00
target-unicore32 tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
target-xtensa tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
tcg tcg/tcg-op.c: Fix ld/st of 64 bit values on 32-bit bigendian hosts 2015-04-09 10:51:10 +01:00
tests qtest: Add assertion that required environment variable is set 2015-04-28 15:27:51 -04:00
trace Remove superfluous '\n' around error_report() 2015-03-10 08:15:33 +03:00
ui spice: misc fixes. 2015-04-27 20:00:57 +01:00
util block: Resize bitmaps on bdrv_truncate 2015-04-28 15:36:10 +02:00
.exrc
.gitignore gitignore: Ignore more .pod files. 2015-04-04 09:45:59 +03:00
.gitmodules PPC: Add u-boot firmware for e500 2014-06-16 13:24:35 +02:00
.mailmap Update mailmap 2013-09-05 09:40:31 -05:00
.travis.yml .travis.yml: Add "--enable-modules" 2015-01-26 12:27:05 +01:00
accel.c accel: Create accel object when initializing machine 2014-10-09 15:36:14 +02:00
aio-posix.c AioContext: acquire/release AioContext during aio_poll 2015-04-28 15:36:08 +02:00
aio-win32.c AioContext: acquire/release AioContext during aio_poll 2015-04-28 15:36:08 +02:00
arch_init.c migration: remove last_sent_block from save_page_header 2015-03-26 15:31:46 +01:00
async.c iothread: release iothread around aio_poll 2015-04-28 15:36:08 +02:00
balloon.c balloon: improve error msg when adding second device 2015-04-24 14:18:05 -04:00
block.c block: move I/O request processing to block/io.c 2015-04-28 15:36:17 +02:00
blockdev-nbd.c nbd: Fix up comment after commit e140177 2015-03-25 13:38:07 +01:00
blockdev.c block: Ensure consistent bitmap function prototypes 2015-04-28 15:36:10 +02:00
blockjob.c blockjob: Allow nested pause 2015-04-28 15:36:09 +02:00
bootdevice.c misc: fix typos in copyright declaration 2015-03-26 14:21:43 +01:00
bt-host.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
bt-vhci.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
Changelog Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
CODING_STYLE CODING_STYLE: Section about conditional statement 2014-08-15 18:54:06 +04:00
configure configure: require __thread support 2015-05-08 12:30:13 +02:00
COPYING
COPYING.LIB
coroutine-gthread.c glib-compat.h: add new thread API emulation on top of pre-2.31 API 2014-06-10 07:44:01 +02:00
coroutine-sigaltstack.c coroutine-sigaltstack: Change jmp_buf to sigjmp_buf 2014-11-11 11:07:55 +03:00
coroutine-ucontext.c coroutine-ucontext: use __thread 2015-01-13 13:43:28 +00:00
coroutine-win32.c coroutine-win32.c: Add noinline attribute to work around gcc bug 2014-06-26 14:08:14 +01:00
cpu-exec.c - vhost-scsi: add bootindex property 2015-02-24 13:58:18 +00:00
cpus.c cpus: Don't kick un-realized cpus. 2015-03-25 13:38:07 +01:00
cputlb.c Add MemTxAttrs to the IOTLB 2015-04-26 16:49:24 +01:00
device_tree.c machine: query phandle-start machine property 2015-03-11 18:17:11 +01:00
device-hotplug.c pci-hotplug-old: Has been dead for five major releases, bury 2015-03-01 12:37:54 +01:00
disas.c monitor: QEMU Monitor Instruction Disassembly Incorrect for PowerPC LE Mode 2014-06-16 13:24:26 +02:00
dma-helpers.c - miscellaneous cleanups for TCG (Emilio) and NBD (Bogdan) 2015-04-30 12:04:11 +01:00
dump.c dump: Fix dump-guest-memory termination and use-after-close 2014-11-02 10:04:34 +03:00
exec.c exec: move rcu_read_lock/unlock to address_space_translate callers 2015-04-30 16:55:32 +02:00
gdbstub.c gdbstub: avoid possible NULL pointer dereference 2015-03-10 08:15:34 +03:00
HACKING HACKING: Document vaddr type usage 2013-07-23 02:41:31 +02:00
hmp-commands.hx monitor: Make client_migrate_info synchronous 2015-04-27 12:46:57 +02:00
hmp.c qmp: Add support of "dirty-bitmap" sync mode for drive-backup 2015-04-28 15:36:10 +02:00
hmp.h qom: Implement qom-set HMP command 2015-03-17 14:31:15 +01:00
iohandler.c iohandler.c: Properly initialize sigaction struct 2014-05-24 00:07:29 +04:00
ioport.c - miscellaneous cleanups for TCG (Emilio) and NBD (Bogdan) 2015-04-30 12:04:11 +01:00
iothread.c iothread: release iothread around aio_poll 2015-04-28 15:36:08 +02:00
kvm-all.c kvm: add support for memory transaction attributes 2015-04-30 16:55:32 +02:00
kvm-stub.c pc: kvm: check if KVM has free memory slots to avoid abort() 2014-11-23 12:11:29 +02:00
LICENSE vfio: move hw/misc/vfio.c to hw/vfio/pci.c Move vfio.h into include/hw/vfio 2014-12-19 15:24:06 -07:00
main-loop.c Revert "main-loop.c: Handle SIGINT, SIGHUP and SIGTERM synchronously" 2014-10-27 15:05:09 +00:00
MAINTAINERS MAINTAINERS: Add Fam Zheng as Null block driver maintainer 2015-04-28 15:36:09 +02:00
Makefile Use $(MAKE) for recursive make 2015-04-02 15:58:39 +02:00
Makefile.objs QJSON: Add JSON writer 2015-02-05 17:16:14 +01:00
Makefile.target Makefile.target: prepend $libs_softmmu to $LIBS 2015-04-28 22:14:14 +02:00
memory_mapping.c Add skip_dump flag to ignore memory region during dump 2014-10-31 11:29:01 +01:00
memory.c mtree: also print disabled regions 2015-04-30 16:55:16 +02:00
module-common.c module: implement module loading 2014-02-20 13:14:18 +01:00
monitor.c target-arm queue: 2015-04-28 10:31:03 +01:00
nbd.c qemu-nbd: only send a limited number of errno codes on the wire 2015-05-08 14:45:11 +02:00
numa.c numa: Print warning if no node is assigned to a CPU 2015-03-19 16:20:15 -03:00
os-posix.c rcu: do not create thread in pthread_atfork callback 2015-04-01 10:06:38 +02:00
os-win32.c pidfile: stop making pidfile error a special case 2014-11-02 10:04:34 +03:00
page_cache.c xbzrle: rebuild the cache_is_cached function 2015-01-15 17:49:43 +05:30
qapi-schema.json migration: Convert 'status' of MigrationInfo to use an enum type 2015-03-17 15:20:37 +01:00
qdev-monitor.c qom: Implement info qom-tree HMP command 2015-03-17 14:31:21 +01:00
qdict-test-data.txt
qemu-bridge-helper.c qemu-bridge-helper: Fix fd leak in main() 2014-06-27 10:39:10 +02:00
qemu-char.c qemu-img: Suppress unhelpful extra errors in convert, amend 2015-02-26 14:51:21 +01:00
qemu-coroutine-io.c coroutine-io: Return -errno in case of error 2015-03-18 12:07:21 +01:00
qemu-coroutine-lock.c coroutine: remove qemu_co_queue_wait_insert_head 2013-12-02 17:11:49 +01:00
qemu-coroutine-sleep.c coroutine: Drop co_sleep_ns 2014-08-29 10:46:58 +01:00
qemu-coroutine.c coroutine: Clean up qemu_coroutine_enter() 2015-03-09 11:11:59 +01:00
qemu-doc.texi raw-posix: Deprecate host floppy passthrough 2015-03-19 11:43:02 +01:00
qemu-img-cmds.hx qemu-img: Add progress output for amend 2014-11-03 11:41:48 +00:00
qemu-img.c qemu-img convert: Rewrite copying logic 2015-04-28 15:36:09 +02:00
qemu-img.texi qemu-img: Add progress output for amend 2014-11-03 11:41:48 +00:00
qemu-io-cmds.c qemu-io: Use BlockBackend 2015-02-16 15:07:19 +00:00
qemu-io.c Clean up around error_get_pretty(), qerror_report_err() 2015-02-26 07:01:08 +00:00
qemu-log.c qemu-log: Correct help text of 'log cpu_reset' 2015-02-10 09:27:20 +03:00
qemu-nbd.c nbd: Set block size to BDRV_SECTOR_SIZE 2015-03-18 12:07:01 +01:00
qemu-nbd.texi nbd: Miscellaneous typo fixes. 2014-05-24 00:07:29 +04:00
qemu-options-wrapper.h
qemu-options.h
qemu-options.hx Block patches for 2.3.0-rc1 2015-03-19 17:47:08 +00:00
qemu-seccomp.c seccomp: add mlockall to whitelist 2015-01-23 14:07:08 +01:00
qemu-tech.texi
qemu-timer.c qemu-timer.c: Trim list of included headers 2015-01-26 18:15:54 +00:00
qemu.nsi nsis: Improved support for parallel installation of 32 and 64 bit code 2013-11-07 07:02:44 +01:00
qemu.sasl sasl: Avoid 'Could not find keytab file' in syslog 2014-03-15 13:54:18 +04:00
qjson.c QJSON: fix typo in author's email address 2015-02-10 09:27:20 +03:00
qmp-commands.hx qmp: add block-dirty-bitmap-clear 2015-04-28 15:36:10 +02:00
qmp.c qom: Add can_be_deleted callback to UserCreatableClass 2015-04-01 10:06:38 +02:00
qtest.c qtest: Use qemu_opt_set() instead of qemu_opts_parse() 2015-02-26 14:52:13 +01:00
README Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
rules.mak rules.mak: Force CFLAGS for all objects in DSO 2015-05-08 14:45:11 +02:00
savevm.c error: Replace error_report() & error_free() with error_report_err() 2015-03-19 11:11:55 +03:00
softmmu_template.h Add MemTxAttrs to the IOTLB 2015-04-26 16:49:24 +01:00
spice-qemu-char.c spice: Add missing 'static' attribute 2015-02-10 10:26:05 +03:00
tcg-runtime.c tcg: Push tcg-runtime routines into exec/helper-* 2014-05-28 09:33:54 -07:00
tci.c tcg: Remove unused opcodes 2015-02-12 21:21:38 -08:00
thread-pool.c thread-pool: clean up thread_pool_completion_bh() 2015-04-28 15:36:09 +02:00
thunk.c
tpm.c tpm: Remove superfluous '\n' around error_report() 2015-03-10 08:15:33 +03:00
trace-events s390x/kvm: trace all SIGP orders 2015-03-10 09:26:22 +01:00
translate-all.c exec: move rcu_read_lock/unlock to address_space_translate callers 2015-04-30 16:55:32 +02:00
translate-all.h translate-all: Change tb_check_watchpoint() argument to CPUState 2014-03-13 19:20:48 +01:00
user-exec.c user-exec.c: fix build on NetBSD/sparc64 and NetBSD/arm 2015-03-13 15:57:00 +00:00
VERSION Open 2.4 development tree 2015-04-25 22:05:07 +01:00
version.rc Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
vl.c Avoid crashing on multiple -incoming 2015-03-26 15:31:46 +01:00
xen-common-stub.c accel: Move Xen registration code to xen-common.c 2014-10-04 08:59:15 +02:00
xen-common.c accel: Pass MachineState object to accel init functions 2014-10-09 12:57:10 +02:00
xen-hvm-stub.c xen: Remove xen_cmos_set_s3_resume() 2015-03-10 08:15:33 +03:00
xen-hvm.c Xen: Use the ioreq-server API when available 2015-01-20 14:24:10 +00:00
xen-mapcache.c xen: add a lock for the mapcache 2015-01-20 14:24:17 +00:00

README 

Read the documentation in qemu-doc.html or on http://wiki.qemu-project.org

- QEMU team