kernel/arch/um/os-Linux/file.c, branch linux-5.1.y

um: Add support for DISCARD in the UBD Driver

2018-12-27T21:48:20Z

Support for DISCARD and WRITE_ZEROES in the ubd driver using fallocate. DISCARD is enabled by default and can be disabled using a new UBD command line flag. If the underlying fs on which the UBD image is stored does not support DISCARD the support for both DISCARD and WRITE_ZEROES is turned off. Signed-off-by: Anton Ivanov Signed-off-by: Richard Weinberger

um: Compile with modern headers

2018-03-29T20:15:12Z

Recent libcs have gotten a bit more strict, so we actually need to include the right headers and use the right types. This enables UML to compile again. Signed-off-by: Jason A. Donenfeld Cc: stable@vger.kernel.org Signed-off-by: Richard Weinberger

um: Update UBD to use pread/pwrite family of functions

2016-01-10T20:49:48Z

This decreases the number of syscalls per read/write by half. Signed-off-by: Anton Ivanov Signed-off-by: Richard Weinberger

um: Include sys/types.h for makedev(), major(), minor()

2015-06-25T20:42:21Z

The functions in question are not part of the POSIX standard, documentation however hints that the corresponding header shall be sys/types.h. C libraries other than glibc, namely musl, did not include that header via other ways and complained. Signed-off-by: Hans-Werner Hilse Signed-off-by: Richard Weinberger

um: Memory corruption on startup

2014-04-20T21:57:21Z

The reverse case of this race (you must msync before read) is well known. This is the not so common one. It can be triggered only on systems which do a lot of task switching and only at UML startup. If you are starting 200+ UMLs ~ 0.5% will always die without this fix. Signed-off-by: Anton Ivanov [rw: minor whitespace fixes] Signed-off-by: Richard Weinberger

um: ubd: Add REQ_FLUSH suppport

2013-09-07T08:56:49Z

UML's block device driver does not support write barriers, to support this this patch adds REQ_FLUSH suppport. Every time the block layer sends a REQ_FLUSH we fsync() now our backing file to guarantee data consistency. Reported-and-tested-by: Richard W.M. Jones Signed-off-by: Richard Weinberger

um: get rid of pointless include "..." where include <...> will do

2012-10-09T20:28:45Z

Signed-off-by: Al Viro Signed-off-by: Richard Weinberger

um: -include user.h for USER_OBJ, trim includes

2011-11-02T13:14:44Z

Signed-off-by: Al Viro Signed-off-by: Richard Weinberger

Deal with missing exports for hostfs

2010-08-09T20:47:25Z

Signed-off-by: Al Viro

uml: implement O_APPEND

2008-02-05T17:44:30Z

The .a flags in openflags never had an implementation. Signed-off-by: Jeff Dike Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds