linux.git/include/uapi/linux/coda.h, branch v6.6.132

coda: add hinting support for partial file caching

2019-07-17T02:23:23+00:00

This adds support for partial file caching in Coda.  Every read, write
and mmap informs the userspace cache manager about what part of a file
is about to be accessed so that the cache manager can ensure the
relevant parts are available before the operation is allowed to proceed.

When a read or write operation completes, this is also reported to allow
the cache manager to track when partially cached content can be
released.

If the cache manager does not support partial file caching, or when the
entire file has been fetched into the local cache, the cache manager may
return an EOPNOTSUPP error to indicate that intent upcalls are no longer
necessary until the file is closed.

[akpm@linux-foundation.org: little whitespace fixup]
Link: http://lkml.kernel.org/r/20190618181301.6960-1-jaharkes@cs.cmu.edu
Signed-off-by: Pedro Cuadra 
Signed-off-by: Jan Harkes 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

coda: change Coda's user api to use 64-bit time_t in timespec

2019-07-17T02:23:23+00:00

Move the 32-bit time_t problems to userspace.

Link: http://lkml.kernel.org/r/8d089068823bfb292a4020f773922fbd82ffad39.1558117389.git.jaharkes@cs.cmu.edu
Signed-off-by: Jan Harkes 
Cc: Arnd Bergmann 
Cc: Colin Ian King 
Cc: Dan Carpenter 
Cc: David Howells 
Cc: Fabian Frederick 
Cc: Mikko Rapeli 
Cc: Sam Protsenko 
Cc: Yann Droneaud 
Cc: Zhouyang Jia 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

coda: stop using 'struct timespec' in user API

2019-07-17T02:23:23+00:00

We exchange file timestamps with user space using psdev device
read/write operations with a fixed but architecture specific binary
layout.

On 32-bit systems, this uses a 'timespec' structure that is defined by
the C library to contain two 32-bit values for seconds and nanoseconds.
As we get ready for the year 2038 overflow of the 32-bit signed seconds,
the kernel now uses 64-bit timestamps internally, and user space will do
the same change by changing the 'timespec' definition in the future.

Unfortunately, this breaks the layout of the coda_vattr structure, so we
need to redefine that in terms of something that does not change.  I'm
introducing a new 'struct vtimespec' structure here that keeps the
existing layout, and the same change has to be done in the coda user
space copy of linux/coda.h before anyone can use that on a 32-bit
architecture with 64-bit time_t.

An open question is what should happen to actual times past y2038, as
they are now truncated to the last valid date when sent to user space,
and interpreted as pre-1970 times when a timestamp with the MSB set is
read back into the kernel.  Alternatively, we could change the new
timespec64_to_coda()/coda_to_timespec64() functions to use a different
interpretation and extend the available range further to the future by
disallowing past timestamps.  This would require more changes in the
user space side though.

Link: http://lkml.kernel.org/r/562b7324149461743e4fbe2fedbf7c242f7e274a.1558117389.git.jaharkes@cs.cmu.edu
Link: https://patchwork.kernel.org/patch/10474735/
Signed-off-by: Arnd Bergmann 
Signed-off-by: Jan Harkes 
Acked-by: Jan Harkes 
Cc: Colin Ian King 
Cc: Dan Carpenter 
Cc: David Howells 
Cc: Fabian Frederick 
Cc: Mikko Rapeli 
Cc: Sam Protsenko 
Cc: Yann Droneaud 
Cc: Zhouyang Jia 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

uapi linux/coda.h: use __kernel_pid_t for userspace

2019-07-17T02:23:23+00:00

Part of a patch by Mikko Rapeli, as Arnd Bergman commented on the
original patch.

   pid_t might differ between libc and the kernel, so the kernel
   interface has to use types that the kernel defines.

Link: http://lkml.kernel.org/r/f374a71f4d351bc8c8b3ac18ad7765c88d806d10.1558117389.git.jaharkes@cs.cmu.edu
Signed-off-by: Mikko Rapeli 
Signed-off-by: Jan Harkes 
Cc: Arnd Bergmann 
Cc: Colin Ian King 
Cc: Dan Carpenter 
Cc: David Howells 
Cc: Fabian Frederick 
Cc: Sam Protsenko 
Cc: Yann Droneaud 
Cc: Zhouyang Jia 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

UAPI: (Scripted) Disintegrate include/linux

2012-10-13T09:46:48+00:00

Signed-off-by: David Howells 
Acked-by: Arnd Bergmann 
Acked-by: Thomas Gleixner 
Acked-by: Michael Kerrisk 
Acked-by: Paul E. McKenney 
Acked-by: Dave Jones