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a5804fcf7b
xemu/hw
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Omar Sandoval a5804fcf7b 9pfs: local: ignore O_NOATIME if we don't have permissions 
QEMU's local 9pfs server passes through O_NOATIME from the client. If
the QEMU process doesn't have permissions to use O_NOATIME (namely, it
does not own the file nor have the CAP_FOWNER capability), the open will
fail. This causes issues when from the client's point of view, it
believes it has permissions to use O_NOATIME (e.g., a process running as
root in the virtual machine). Additionally, overlayfs on Linux opens
files on the lower layer using O_NOATIME, so in this case a 9pfs mount
can't be used as a lower layer for overlayfs (cf.
dabfe19719/vmtest/onoatimehack.c
and https://github.com/NixOS/nixpkgs/issues/54509).

Luckily, O_NOATIME is effectively a hint, and is often ignored by, e.g.,
network filesystems. open(2) notes that O_NOATIME "may not be effective
on all filesystems. One example is NFS, where the server maintains the
access time." This means that we can honor it when possible but fall
back to ignoring it.

Acked-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Message-Id: <e9bee604e8df528584693a4ec474ded6295ce8ad.1587149256.git.osandov@fb.com>
Signed-off-by: Greg Kurz <groug@kaod.org>
2020-05-14 08:06:43 +02:00
..
9pfs 9pfs: local: ignore O_NOATIME if we don't have permissions 2020-05-14 08:06:43 +02:00
acpi hw/arm/virt: Add nvdimm hotplug support 2020-05-04 10:25:02 -04:00
adc hw/*/Makefile.objs: Move many .o files to common-objs 2020-02-04 09:00:57 +01:00
alpha hw/ide: Do ide_drive_get() within pci_ide_create_devs() 2020-03-17 12:22:36 -04:00
arm hw/arm/musicpal: Map the UART devices unconditionally 2020-05-11 11:48:50 +01:00
audio Compress lines for immediate return 2020-05-04 14:43:22 +02:00
block vhost-user-blk: fix invalid memory access 2020-05-04 10:25:02 -04:00
char hw/char/cadence_uart: add clock support 2020-04-30 15:35:41 +01:00
core Merge tpm 2020/05/06 v1 2020-05-06 21:13:05 +01:00
cpu cpu/arm11mpcore: Set number of GIC priority bits to 4 2020-02-28 16:14:57 +00:00
cris hw: Make MachineClass::is_default a boolean type 2020-02-28 14:57:19 -05:00
display trivial patches (20200504) 2020-05-05 14:03:28 +01:00
dma dma/xlnx-zdma: Fix descriptor loading (REG) wrt endianness 2020-04-30 11:52:25 +01:00
gpio hw/gpio/aspeed_gpio: Remove dead assignment 2020-05-04 14:43:24 +02:00
hppa hw/ide: Remove unneeded inclusion of hw/ide.h 2020-03-17 12:22:36 -04:00
hyperv lockable: Replace locks with lock guard macros 2020-05-04 16:07:43 +01:00
i2c hw/arm/nrf51: Add NRF51_PERIPHERAL_SIZE definition 2020-05-11 11:05:11 +01:00
i386 hw: add compat machines for 5.1 2020-05-06 10:12:16 -04:00
ide hw/ide/sii3112: Remove dead assignment 2020-05-04 14:43:24 +02:00
input hw/input/adb-kbd: Remove dead assignment 2020-05-04 14:43:24 +02:00
intc bugfix: Use gicr_typer in arm_gicv3_icc_reset 2020-04-30 11:52:27 +01:00
ipack qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
ipmi qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
isa trivial patches (20200504) 2020-05-05 14:03:28 +01:00
lm32 hw: Make MachineClass::is_default a boolean type 2020-02-28 14:57:19 -05:00
m68k hw/m68k: Use memory_region_init_rom() with read-only regions 2020-03-17 15:18:47 +01:00
mem trivial patches (20200504) 2020-05-05 14:03:28 +01:00
microblaze hw: Make MachineClass::is_default a boolean type 2020-02-28 14:57:19 -05:00
mips smbus: Fix spd_data_generate() error API violation 2020-04-29 08:01:52 +02:00
misc aspeed: sdmc: Implement AST2600 locking behaviour 2020-05-11 11:00:37 +01:00
moxie hw: Make MachineClass::is_default a boolean type 2020-02-28 14:57:19 -05:00
net target-arm queue: 2020-04-30 15:45:34 +01:00
nios2 hw: Make MachineClass::is_default a boolean type 2020-02-28 14:57:19 -05:00
nubus hw/m68k: add Nubus support 2019-10-28 19:06:47 +01:00
nvram fw_cfg: Migrate ACPI table mr sizes separately 2020-04-13 06:55:54 -04:00
openrisc hw: Make MachineClass::is_default a boolean type 2020-02-28 14:57:19 -05:00
pci hw/pci/pcie: Replace PCI_DEVICE() casts with existing variable 2020-05-04 10:25:02 -04:00
pci-bridge pcie_root_port: Add hotplug disabling option 2020-03-08 09:18:29 -04:00
pci-host hw/pci-host: Use memory_region_init_rom() with read-only regions 2020-03-17 15:18:47 +01:00
pcmcia hw/*/Makefile.objs: Move many .o files to common-objs 2020-02-04 09:00:57 +01:00
ppc ppc patch queue for 2020-04-07 2020-05-07 10:55:12 +01:00
rdma lockable: Replace locks with lock guard macros 2020-05-04 16:07:43 +01:00
riscv hw/riscv/spike: Allow more than one CPUs 2020-04-29 13:16:38 -07:00
rtc rtc: add RTC_ISA_BASE 2020-05-04 10:25:02 -04:00
s390x hw: add compat machines for 5.1 2020-05-06 10:12:16 -04:00
scsi scsi/esp-pci: add g_assert() for fix clang analyzer warning in esp_pci_io_write() 2020-05-04 11:17:27 +02:00
sd various: Remove suspicious '\' character outside of #define in C code 2020-04-29 08:01:51 +02:00
semihosting semihosting: add qemu_semihosting_console_inc for SYS_READC 2020-01-09 11:41:29 +00:00
sh4 hw/sh4: Use memory_region_init_rom() with read-only regions 2020-03-17 15:18:47 +01:00
smbios hw/smbios/smbios: Remove unused include 2020-02-06 10:38:57 +01:00
sparc hw/sparc: Use memory_region_init_rom() with read-only regions 2020-03-17 15:18:48 +01:00
sparc64 hw/ide: Do ide_drive_get() within pci_ide_create_devs() 2020-03-17 12:22:36 -04:00
ssi aspeed/smc: Fix DMA support for AST2600 2020-03-23 17:22:30 +00:00
timer hw/timer/nrf51_timer: Add trace event of counter value update 2020-05-11 11:05:52 +01:00
tpm hw/tpm: fix usage of bool in tpm-tis.c 2020-05-12 11:47:24 -04:00
tricore hw: Do not initialize MachineClass::is_default to 0 2020-02-28 14:57:19 -05:00
unicore32 hw: Make MachineClass::is_default a boolean type 2020-02-28 14:57:19 -05:00
usb hw/usb/xen-usb.c: Pass struct usbback_req* to usbback_packet_complete() 2020-04-07 16:13:26 +01:00
vfio lockable: replaced locks with lock guard macros where appropriate 2020-05-04 16:07:43 +01:00
virtio Refactor vhost_user_set_mem_table functions 2020-05-04 10:25:03 -04:00
watchdog qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
xen xen/pt: Fix flawed conversion to realize() 2020-04-29 08:01:52 +02:00
xenpv trivial: Remove xenfb_enabled from sysemu.h 2020-02-04 09:00:57 +01:00
xtensa hw/xtensa/xtfpga:fix leak of fdevice tree blob 2020-02-19 10:33:38 +01:00
Kconfig Remove the core bluetooth code 2019-12-17 09:01:14 +01:00
Makefile.objs Remove the core bluetooth code 2019-12-17 09:01:14 +01:00