linux/arch/parisc/include/asm
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