Christoph Hellwig 6b2f3d1f76 vfs: Implement proper O_SYNC semantics ... While Linux provided an O_SYNC flag basically since day 1, it took until Linux 2.4.0-test12pre2 to actually get it implemented for filesystems, since that day we had generic_osync_around with only minor changes and the great "For now, when the user asks for O_SYNC, we'll actually give O_DSYNC" comment. This patch intends to actually give us real O_SYNC semantics in addition to the O_DSYNC semantics. After Jan's O_SYNC patches which are required before this patch it's actually surprisingly simple, we just need to figure out when to set the datasync flag to vfs_fsync_range and when not. This patch renames the existing O_SYNC flag to O_DSYNC while keeping it's numerical value to keep binary compatibility, and adds a new real O_SYNC flag. To guarantee backwards compatiblity it is defined as expanding to both the O_DSYNC and the new additional binary flag (__O_SYNC) to make sure we are backwards-compatible when compiled against the new headers. This also means that all places that don't care about the differences can just check O_DSYNC and get the right behaviour for O_SYNC, too - only places that actuall care need to check __O_SYNC in addition. Drivers and network filesystems have been updated in a fail safe way to always do the full sync magic if O_DSYNC is set. The few places setting O_SYNC for lower layers are kept that way for now to stay failsafe. We enforce that O_DSYNC is set when __O_SYNC is set early in the open path to make sure we always get these sane options. Note that parisc really screwed up their headers as they already define a O_DSYNC that has always been a no-op. We try to repair it by using it for the new O_DSYNC and redefinining O_SYNC to send both the traditional O_SYNC numerical value _and_ the O_DSYNC one. Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Grant Grundler <grundler@parisc-linux.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Ingo Molnar <mingo@elte.hu> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andreas Dilger <adilger@sun.com> Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com> Acked-by: Kyle McMartin <kyle@mcmartin.ca> Acked-by: Ulrich Drepper <drepper@redhat.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jan Kara <jack@suse.cz>		2009-12-10 15:02:50 +01:00
..
dec
emma	MIPS: Eleminate filenames from comments	2009-08-03 17:52:40 +01:00
fw
ip32
lasat	MIPS: Lasat: Fix compilation	2009-09-17 20:07:42 +02:00
mach-ar7	MIPS: AR7: register watchdog device only if enabled in hw configuration	2009-11-02 12:00:03 +01:00
mach-au1x00	MIPS: AU1000: Fix build failure for db1x00 configured for Au1100 SoC	2009-11-02 12:00:03 +01:00
mach-bcm47xx	MIPS: BCM47xx: Fix gpio_direction_output	2009-06-17 11:06:28 +01:00
mach-bcm63xx	MIPS: BCM63xx: Make bcm63xx_uart_register an initfunc	2009-11-02 12:00:03 +01:00
mach-cavium-octeon	MIPS: Octeon: Set kernel_uses_llsc to false on non-SMP builds.	2009-09-17 20:07:50 +02:00
mach-cobalt	Update Yoichi Yuasa's e-mail address	2009-07-03 15:45:29 +01:00
mach-db1x00
mach-dec
mach-emma2rh
mach-excite
mach-generic	MIPS: Pass struct device to plat_dma_addr_to_phys()	2009-06-17 11:06:24 +01:00
mach-ip22
mach-ip27	MIPS: IP27: Fix build	2009-11-02 12:00:01 +01:00
mach-ip28
mach-ip32	MIPS: Pass struct device to plat_dma_addr_to_phys()	2009-06-17 11:06:24 +01:00
mach-jazz	MIPS: Pass struct device to plat_dma_addr_to_phys()	2009-06-17 11:06:24 +01:00
mach-lasat
mach-loongson	MIPS: Loongson 2: Set cpu_has_dc_aliases and cpu_icache_snoops_remote_store	2009-11-02 12:00:07 +01:00
mach-malta	MIPS: Malta: Remove pointless use use of CONFIG_CPU_HAS_LLSC	2009-09-17 20:07:49 +02:00
mach-mipssim
mach-pb1x00
mach-pnx833x	tree-wide: fix assorted typos all over the place	2009-12-04 15:39:55 +01:00
mach-pnx8550
mach-rc32434	MIPS: RB532: Cleanup cpu-features-overrides	2009-06-17 11:06:26 +01:00
mach-rm
mach-sibyte
mach-tx39xx
mach-tx49xx
mach-vr41xx
mach-wrppmc
mach-yosemite
mips-boards	MIPS: Loongson: Change naming methods	2009-09-17 20:07:47 +02:00
octeon	MIPS: Octeon: Add hardware RNG platform device.	2009-09-17 20:07:51 +02:00
pci
pmc-sierra/msp71xx	MIPS: MSPxxxx: define MIPS34K_MISSED_ITLB_WAR for other PMC-Sierra SoC	2009-08-03 17:52:43 +01:00
sgi	tree-wide: fix assorted typos all over the place	2009-12-04 15:39:55 +01:00
sibyte	tree-wide: fix assorted typos all over the place	2009-12-04 15:39:55 +01:00
sn	tree-wide: fix assorted typos all over the place	2009-12-04 15:39:55 +01:00
txx9	MIPS: TXx9: Add TX4939 RNG support	2009-06-17 11:06:27 +01:00
vr41xx	Update Yoichi Yuasa's e-mail address	2009-07-03 15:45:29 +01:00
xtalk
abi.h
addrspace.h
amon.h	MIPS: CMP: activate CMP support	2009-07-03 15:45:26 +01:00
asm.h
asmmacro-32.h
asmmacro-64.h
asmmacro.h	MIPS: Use EI/DI for MIPS R2.	2008-12-12 18:12:23 +00:00
atomic.h	MIPS: Allow kernel use of LL/SC to be separate from the presence of LL/SC.	2009-09-17 20:07:50 +02:00
auxvec.h
barrier.h
bcache.h
bitops.h	MIPS: Allow kernel use of LL/SC to be separate from the presence of LL/SC.	2009-09-17 20:07:50 +02:00
bitsperlong.h	asm-generic: introduce asm/bitsperlong.h	2009-06-11 21:02:14 +02:00
bootinfo.h	MIPS: Loongson: Add a machtype kernel command line argument	2009-09-17 20:07:47 +02:00
branch.h
break.h	MIPS: Switch FPU emulator trap to BREAK instruction.	2008-10-30 14:44:34 +00:00
bug.h	MIPS: Convert BUG() to use unreachable()	2009-12-05 09:10:12 -08:00
bugs.h	MIPS: Build fix - include <linux/smp.h> into all smp_processor_id() users.	2009-06-24 18:34:39 +01:00
byteorder.h	byteorder: make swab.h include asm/swab.h like a regular header	2009-01-14 19:56:50 -08:00
cache.h
cachectl.h
cacheflush.h	block: add helpers to run flush_dcache_page() against a bio and a request's pages	2009-11-26 09:16:19 +01:00
cacheops.h
cevt-r4k.h
checksum.h	MIPS: uaccess: Switch lock annotations to might_fault().	2009-05-14 13:50:28 +01:00
cmp.h
cmpxchg.h	MIPS: Allow kernel use of LL/SC to be separate from the presence of LL/SC.	2009-09-17 20:07:50 +02:00
compat-signal.h
compat.h	MIPS: Do not include seccomp.h from compat.h	2009-05-14 13:50:26 +01:00
compiler.h
cpu-features.h	MIPS: Allow kernel use of LL/SC to be separate from the presence of LL/SC.	2009-09-17 20:07:50 +02:00
cpu-info.h	MIPS: Outline udelay and fix a few issues.	2009-06-08 16:57:51 +01:00
cpu.h	MIPS: BCM63xx: Add Broadcom 63xx CPU definitions.	2009-09-17 20:07:52 +02:00
cputime.h
current.h
debug.h
delay.h	MIPS: Fix potencial build error in <asm/delay.h>	2009-09-17 20:07:41 +02:00
device.h
div64.h	MIPS: Rewrite <asm/div64.h> to work with gcc 4.4.0.	2009-05-14 13:50:29 +01:00
dma-mapping.h	MIPS: Add DMA declare coherent memory support	2009-11-13 18:10:37 +01:00
dma.h
ds1287.h	Update Yoichi Yuasa's e-mail address	2009-07-03 15:45:29 +01:00
dsp.h
edac.h
elf.h	MIPS: 64-bit: Fix o32 core dump	2009-07-03 15:45:27 +01:00
emergency-restart.h
errno.h	cfg80211: errno.h: define ERFKILL	2009-06-07 05:01:00 -07:00
fb.h
fcntl.h	vfs: Implement proper O_SYNC semantics	2009-12-10 15:02:50 +01:00
fixmap.h	MIPS: Fix machine check exception in kmap_coherent()	2009-11-02 12:00:04 +01:00
floppy.h
fpregdef.h
fpu.h
fpu_emulator.h	MIPS: Switch FPU emulator trap to BREAK instruction.	2008-10-30 14:44:34 +00:00
ftrace.h	tracing: make CALLER_ADDRx overwriteable	2009-03-02 16:49:37 -05:00
futex.h
gcmpregs.h	MIPS: GIC: Random fixes and enhancements.	2009-11-02 12:00:06 +01:00
gic.h	MIPS: GIC: Random fixes and enhancements.	2009-11-02 12:00:06 +01:00
gpio.h
gt64120.h
hardirq.h	MIPS: Convert to asm-generic/hardirq.h	2009-09-17 20:07:48 +02:00
hazards.h	MIPS: Loongson 2 needs no hazard barriers.	2009-05-14 13:50:26 +01:00
highmem.h	MIPS: Fix highmem.	2009-05-14 13:50:29 +01:00
hugetlb.h	MIPS: Add support files for hugetlbfs.	2009-06-17 11:06:30 +01:00
hw_irq.h
i8253.h	time: move PIT_TICK_RATE to linux/timex.h	2009-06-16 19:47:27 -07:00
i8259.h
ide.h
inst.h
io.h	MIPS: Modify core io.h macros to account for the Octeon Errata Core-301.	2009-01-11 09:57:22 +00:00
ioctl.h	MIPS: ioctl.h: Cleanup.	2009-06-17 11:06:28 +01:00
ioctls.h
ipcbuf.h
irq.h	MIPS: Build fix - include <linux/smp.h> into all smp_processor_id() users.	2009-06-24 18:34:39 +01:00
irq_cpu.h
irq_gt641xx.h	Update Yoichi Yuasa's e-mail address	2009-07-03 15:45:29 +01:00
irq_regs.h
irqflags.h
isadep.h
jazz.h
jazzdma.h
Kbuild	byteorder: make swab.h include asm/swab.h like a regular header	2009-01-14 19:56:50 -08:00
kdebug.h
kexec.h
kgdb.h
kmap_types.h	kmap_types: make most arches use generic header file	2009-06-16 19:47:51 -07:00
kspd.h
linkage.h
local.h	MIPS: Allow kernel use of LL/SC to be separate from the presence of LL/SC.	2009-09-17 20:07:50 +02:00
m48t37.h
mc146818-time.h
mc146818rtc.h
mips_mt.h
mipsmtregs.h
mipsprom.h
mipsregs.h	MIPS: Add hugetlbfs page defines.	2009-06-17 11:06:30 +01:00
mman.h	MIPS: Add missing definition for MADV_HWPOISON.	2009-12-01 16:21:25 +00:00
mmu.h
mmu_context.h	MIPS: Avoid potential hazard on Context register	2009-11-02 12:00:07 +01:00
mmzone.h
module.h	MIPS: Add Cavium OCTEON processor constants and CPU probe.	2009-01-11 09:57:22 +00:00
msc01_ic.h
msgbuf.h
mutex.h
nile4.h
paccess.h
page.h	MIPS: make page.h constants available to assembly.	2009-09-17 20:07:42 +02:00
param.h
parport.h
pci.h	PCI: remove pcibios_scan_all_fns()	2009-09-09 13:29:18 -07:00
percpu.h
pgalloc.h	mm: Remove duplicate definitions in MIPS and SH	2009-07-27 17:26:44 -07:00
pgtable-32.h
pgtable-64.h	MIPS: Shrink the size of tlb handler	2009-09-17 20:07:51 +02:00
pgtable-bits.h	MIPS: Add hugetlbfs page defines.	2009-06-17 11:06:30 +01:00
pgtable.h	mm: ZERO_PAGE without PTE_SPECIAL	2009-09-22 07:17:41 -07:00
pmon.h
poll.h
posix_types.h
prefetch.h	MIPS: NEC VR5500 processor support fixup	2009-03-11 21:11:07 +01:00
processor.h	MIPS: Avoid clobbering struct pt_regs in kthreads	2009-08-03 17:52:41 +01:00
ptrace.h	MIPS: Fix a typo in watchpoint register structure.	2009-01-30 21:32:58 +00:00
r4k-timer.h
r4kcache.h	MIPS: Support 64-byte D-cache line size	2009-06-17 11:06:24 +01:00
reboot.h
reg.h	MIPS: 64-bit: Fix o32 core dump	2009-07-03 15:45:27 +01:00
regdef.h
resource.h
rm9k-ocd.h
rtlx.h
scatterlist.h
seccomp.h	MIPS: Fix TIF_32BIT undefined problem when seccomp is disabled	2009-03-13 23:07:59 +01:00
sections.h
segment.h
sembuf.h
serial.h
setup.h	MIPS: Extend COMMAND_LINE_SIZE	2009-11-02 12:00:01 +01:00
sgialib.h
sgiarcs.h
sgidefs.h
shmbuf.h
shmparam.h
sigcontext.h	headers_check fix: mips, sigcontext.h	2009-02-01 11:01:26 +05:30
siginfo.h
signal.h	asm-generic: rename termios.h, signal.h and mman.h	2009-06-11 21:01:52 +02:00
sim.h
smp-ops.h	cpumask: arch_send_call_function_ipi_mask: mips	2009-09-24 09:34:45 +09:30
smp.h	MIPS: SMP: Inline arch_send_call_function_{single_ipi,ipi_mask}	2009-09-30 21:47:00 +02:00
smtc.h
smtc_ipi.h	MIPS: SMTC: Avoid queing multiple reschedule IPIs	2009-11-02 12:00:06 +01:00
smtc_proc.h
smvp.h
sni.h
socket.h	net: Generalize socket rx gap / receive queue overflow cmsg	2009-10-12 13:26:31 -07:00
sockios.h
sparsemem.h
spinlock.h	Allow rwlocks to re-enable interrupts	2009-04-02 19:05:11 -07:00
spinlock_types.h
spram.h	MIPS: SPRAM: Clean up support code a little	2009-11-02 12:00:05 +01:00
stackframe.h	MIPS: Cavium OCTEON multiplier state preservation.	2009-01-11 09:57:24 +00:00
stacktrace.h
stat.h
statfs.h
string.h
suspend.h	MIPS: Add hibernation support	2009-06-17 11:06:31 +01:00
swab.h	MIPS: Define __arch_swab64 for all mips r2 cpus	2009-07-03 15:45:25 +01:00
sysmips.h
system.h	MIPS: Fix build error if __xchg() is not getting inlined.	2009-12-01 16:21:25 +00:00
termbits.h
termios.h	MIPS: Add return value checks to user_termio_to_kernel_termios()	2009-01-30 21:32:57 +00:00
thread_info.h	MIPS: Cleanup CONFIG_DEBUG_STACK_USAGE version of alloc_thread_info.	2009-11-02 12:00:01 +01:00
time.h	mips: Use generic mult/shift factor calculation for clocks	2009-11-13 20:46:24 +01:00
timex.h
titan_dep.h
tlb.h
tlbdebug.h
tlbflush.h
topology.h
traps.h
txx9irq.h
txx9pio.h
txx9tmr.h
types.h	asm-generic: introduce asm/bitsperlong.h	2009-06-11 21:02:14 +02:00
uaccess.h	MIPS: Fix sparse warning in incompatiable argument type of clear_user.	2009-05-22 13:52:05 +01:00
ucontext.h
unaligned.h	MIPS: Avoid spurious make includecheck message	2009-09-30 21:47:02 +02:00
unistd.h	MIPS: Wire up recvmmsg syscall	2009-12-01 16:15:49 -08:00
user.h
vga.h
vpe.h
war.h
watch.h
wbflush.h
xor.h