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https://github.com/edk2-porting/linux-next.git
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6b2f3d1f76
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>
39 lines
1.1 KiB
C
39 lines
1.1 KiB
C
#ifndef _PARISC_FCNTL_H
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#define _PARISC_FCNTL_H
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#define O_APPEND 000000010
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#define O_BLKSEEK 000000100 /* HPUX only */
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#define O_CREAT 000000400 /* not fcntl */
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#define O_EXCL 000002000 /* not fcntl */
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#define O_LARGEFILE 000004000
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#define __O_SYNC 000100000
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#define O_SYNC (__O_SYNC|O_DSYNC)
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#define O_NONBLOCK 000200004 /* HPUX has separate NDELAY & NONBLOCK */
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#define O_NOCTTY 000400000 /* not fcntl */
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#define O_DSYNC 001000000 /* HPUX only */
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#define O_RSYNC 002000000 /* HPUX only */
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#define O_NOATIME 004000000
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#define O_CLOEXEC 010000000 /* set close_on_exec */
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#define O_DIRECTORY 000010000 /* must be a directory */
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#define O_NOFOLLOW 000000200 /* don't follow links */
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#define O_INVISIBLE 004000000 /* invisible I/O, for DMAPI/XDSM */
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#define F_GETLK64 8
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#define F_SETLK64 9
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#define F_SETLKW64 10
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#define F_GETOWN 11 /* for sockets. */
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#define F_SETOWN 12 /* for sockets. */
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#define F_SETSIG 13 /* for sockets. */
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#define F_GETSIG 14 /* for sockets. */
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/* for posix fcntl() and lockf() */
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#define F_RDLCK 01
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#define F_WRLCK 02
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#define F_UNLCK 03
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#include <asm-generic/fcntl.h>
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#endif
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