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
..
agp.h	agp: kill phys_to_gart() and gart_to_phys()	2009-08-03 09:05:00 +01:00
asmregs.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
assembly.h	parisc: fix 64bit build	2009-03-13 01:18:56 -04:00
atomic.h	parisc: use generic atomic64 on 32-bit	2009-07-03 03:34:13 +00:00
auxvec.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
bitops.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
bitsperlong.h	asm-generic: introduce asm/bitsperlong.h	2009-06-11 21:02:14 +02:00
bug.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
bugs.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
byteorder.h	byteorder: make swab.h include asm/swab.h like a regular header	2009-01-14 19:56:50 -08:00
cache.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
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
checksum.h	parisc: fix ipv6 checksum	2009-01-05 19:11:05 +00:00
compat_rt_sigframe.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
compat_signal.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
compat_ucontext.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
compat.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
cputime.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
current.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
delay.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
device.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
div64.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
dma-mapping.h	Documentation: move DMA-mapping.txt to Doc/PCI/	2009-01-29 18:19:29 -08:00
dma.h	parisc: remove CVS keywords	2009-07-03 03:34:06 +00:00
eisa_bus.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
eisa_eeprom.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
elf.h	parisc: Move kernel Elf_Fdesc define to <asm/elf.h>	2009-04-02 04:16:24 +00:00
emergency-restart.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
errno.h	cfg80211: errno.h: define ERFKILL	2009-06-07 05:01:00 -07:00
fb.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
fcntl.h	vfs: Implement proper O_SYNC semantics	2009-12-10 15:02:50 +01:00
fixmap.h	parisc: rename parisc's vmalloc_start to parisc_vmalloc_start	2009-09-27 23:27:04 -04:00
floppy.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
ftrace.h	parisc: add ftrace (function and graph tracer) functionality	2009-03-31 02:51:34 +00:00
futex.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
grfioctl.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
hardirq.h	parisc: convert to asm-generic/hardirq.h	2009-09-28 00:24:23 -04:00
hardware.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
hw_irq.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
ide.h	Merge git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6	2008-10-20 14:40:31 -07:00
io.h	parisc: define x->x mmio accessors	2009-03-13 01:20:48 -04:00
ioctl.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
ioctls.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
ipcbuf.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
irq_regs.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
irq.h	parisc: convert cpu_check_affinity to new cpumask api	2009-03-13 01:20:27 -04:00
Kbuild	byteorder: make swab.h include asm/swab.h like a regular header	2009-01-14 19:56:50 -08:00
kdebug.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
kmap_types.h	kmap_types: make most arches use generic header file	2009-06-16 19:47:51 -07:00
led.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
linkage.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
local.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
machdep.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
mc146818rtc.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
mckinley.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
mman.h	mm: add MAP_HUGETLB for mmaping pseudo-anonymous huge page regions	2009-09-22 07:17:41 -07:00
mmu_context.h	parisc: fix braino in commit adding __space_to_prot	2009-01-05 18:15:25 +00:00
mmu.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
mmzone.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
module.h	parisc: fix module loading failure of large kernel modules	2009-01-05 08:40:14 +10:30
msgbuf.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
mutex.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
page.h	asm-generic: rename page.h and uaccess.h	2009-06-11 21:02:17 +02:00
param.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
parisc-device.h	parisc: struct device - replace bus_id with dev_name(), dev_set_name()	2008-11-26 22:22:41 +00:00
parport.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
pci.h	PCI: remove pcibios_scan_all_fns()	2009-09-09 13:29:18 -07:00
pdc_chassis.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
pdc.h	parisc: asm/pdc.h should include asm/page.h	2009-04-02 00:20:15 +00:00
pdcpat.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
percpu.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
perf_event.h	perf: Do the big rename: Performance Counters -> Performance Events	2009-09-21 14:28:04 +02:00
perf.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
pgalloc.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
pgtable.h	parisc: fix usage of 32bit PTE page table entries on 32bit kernels	2009-03-31 02:51:33 +00:00
poll.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
posix_types.h	parisc: __kernel_time_t is always long	2008-11-26 22:22:36 +00:00
prefetch.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
processor.h	parisc: add task_pt_regs macro	2009-07-03 03:34:11 +00:00
psw.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
ptrace.h	parisc: add skeleton syscall.h	2009-09-27 23:07:23 -04:00
real.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
resource.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
ropes.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
rt_sigframe.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
rtc.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
runway.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
scatterlist.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
sections.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
segment.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
sembuf.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
serial.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
setup.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
shmbuf.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
shmparam.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
sigcontext.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
siginfo.h	Merge git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6	2008-10-20 14:40:31 -07:00
signal.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
smp.h	cpumask: remove arch_send_call_function_ipi	2009-09-24 09:34:47 +09:30
socket.h	net: Generalize socket rx gap / receive queue overflow cmsg	2009-10-12 13:26:31 -07:00
sockios.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
spinlock_types.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
spinlock.h	Allow rwlocks to re-enable interrupts	2009-04-02 19:05:11 -07:00
stat.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
statfs.h	Merge git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6	2008-10-20 14:40:31 -07:00
string.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
superio.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
swab.h	headers_check fix: parisc, swab.h	2009-02-01 11:01:27 +05:30
syscall.h	parisc: add skeleton syscall.h	2009-09-27 23:07:23 -04:00
system.h	parisc: fix ldcw inline assembler	2009-07-03 03:34:07 +00:00
termbits.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
termios.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
thread_info.h	parisc: Make THREAD_SIZE available to assembly files and linker scripts.	2009-09-27 23:35:07 -04:00
timex.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
tlb.h	mm: Pass virtual address to [__]p{te,ud,md}_free_tlb()	2009-07-27 12:10:38 -07:00
tlbflush.h	parisc: ensure broadcast tlb purge runs single threaded	2009-07-03 03:34:09 +00:00
topology.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
traps.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
types.h	asm-generic: introduce asm/bitsperlong.h	2009-06-11 21:02:14 +02:00
uaccess.h	asm-generic: rename page.h and uaccess.h	2009-06-11 21:02:17 +02:00
ucontext.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
unaligned.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
unistd.h	perf: Do the big rename: Performance Counters -> Performance Events	2009-09-21 14:28:04 +02:00
unwind.h	parisc: initialize unwinder much earlier	2008-10-10 16:32:30 +00:00
user.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
vga.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00
xor.h	parisc: move include/asm-parisc to arch/parisc/include/asm	2008-10-10 16:32:29 +00:00