kernel_samsung_sm7125

jenna

History

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>		15 years ago
..
aoa	ALSA: Don't assume i2c device probing always succeeds	16 years ago
arm	Merge branch 'topic/misc' into for-linus	15 years ago
atmel	…
core	vfs: Implement proper O_SYNC semantics	15 years ago
drivers	Merge branch 'topic/beep-rename' into topic/core-change	15 years ago
i2c	Merge branch 'topic/hda' into for-linus	15 years ago
isa	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6	15 years ago
mips	ALSA: Fix invalid __exit in sound/mips/*.c	16 years ago
oss	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	15 years ago
parisc	ALSA: sound/parisc: Move dereference after NULL test	15 years ago
pci	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6	15 years ago
pcmcia	pcmcia: rework the irq_req_t typedef	15 years ago
ppc	Merge branch 'topic/beep-rename' into topic/core-change	15 years ago
sh	Merge branch 'topic/beep-rename' into topic/core-change	15 years ago
soc	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6	15 years ago
sparc	…
spi	ALSA: Convert to snd_card_create() in other sound/*	16 years ago
synth	tree-wide: fix typos "couter" -> "counter"	15 years ago
usb	ALSA: snd-usb-us122l: add product IDs of US-122MKII and US-144MKII	15 years ago
Kconfig	tree-wide: fix assorted typos all over the place	15 years ago
Makefile	ALSA: Add Atmel ALSA drivers directory	16 years ago
ac97_bus.c	…
last.c	…
sound_core.c	tree-wide: fix assorted typos all over the place	15 years ago
sound_firmware.c	…