coda: stop using 'struct timespec' in user API

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 <arnd@arndb.de>
Signed-off-by: Jan Harkes <jaharkes@cs.cmu.edu>
Acked-by: Jan Harkes <jaharkes@cs.cmu.edu>
Cc: Colin Ian King <colin.king@canonical.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Fabian Frederick <fabf@skynet.be>
Cc: Mikko Rapeli <mikko.rapeli@iki.fi>
Cc: Sam Protsenko <semen.protsenko@linaro.org>
Cc: Yann Droneaud <ydroneaud@opteya.com>
Cc: Zhouyang Jia <jiazhouyang09@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 38 insertions, 12 deletions

diff --git a/fs/coda/coda_linux.c b/fs/coda/coda_linux.c
index f3d543dd9a98..8addcd166908 100644
--- a/fs/coda/coda_linux.c
+++ b/fs/coda/coda_linux.c
@@ -66,6 +66,32 @@ unsigned short coda_flags_to_cflags(unsigned short flags)
 	return coda_flags;
 }
 
+static struct timespec64 coda_to_timespec64(struct vtimespec ts)
+{
+	/*
+	 * We interpret incoming timestamps as 'signed' to match traditional
+	 * usage and support pre-1970 timestamps, but this breaks in y2038
+	 * on 32-bit machines.
+	 */
+	struct timespec64 ts64 = {
+		.tv_sec = ts.tv_sec,
+		.tv_nsec = ts.tv_nsec,
+	};
+
+	return ts64;
+}
+
+static struct vtimespec timespec64_to_coda(struct timespec64 ts64)
+{
+	/* clamp the timestamps to the maximum range rather than wrapping */
+	struct vtimespec ts = {
+		.tv_sec = lower_32_bits(clamp_t(time64_t, ts64.tv_sec,
+						LONG_MIN, LONG_MAX)),
+		.tv_nsec = ts64.tv_nsec,
+	};
+
+	return ts;
+}
 
 /* utility functions below */
 void coda_vattr_to_iattr(struct inode *inode, struct coda_vattr *attr)
@@ -105,11 +131,11 @@ void coda_vattr_to_iattr(struct inode *inode, struct coda_vattr *attr)
 	if (attr->va_size != -1)
 		inode->i_blocks = (attr->va_size + 511) >> 9;
 	if (attr->va_atime.tv_sec != -1) 
-		inode->i_atime = timespec_to_timespec64(attr->va_atime);
+		inode->i_atime = coda_to_timespec64(attr->va_atime);
 	if (attr->va_mtime.tv_sec != -1)
-		inode->i_mtime = timespec_to_timespec64(attr->va_mtime);
+		inode->i_mtime = coda_to_timespec64(attr->va_mtime);
         if (attr->va_ctime.tv_sec != -1)
-		inode->i_ctime = timespec_to_timespec64(attr->va_ctime);
+		inode->i_ctime = coda_to_timespec64(attr->va_ctime);
 }
 
 
@@ -130,12 +156,12 @@ void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr)
         vattr->va_uid = (vuid_t) -1; 
         vattr->va_gid = (vgid_t) -1;
         vattr->va_size = (off_t) -1;
-	vattr->va_atime.tv_sec = (time_t) -1;
-	vattr->va_atime.tv_nsec =  (time_t) -1;
-        vattr->va_mtime.tv_sec = (time_t) -1;
-        vattr->va_mtime.tv_nsec = (time_t) -1;
-	vattr->va_ctime.tv_sec = (time_t) -1;
-	vattr->va_ctime.tv_nsec = (time_t) -1;
+	vattr->va_atime.tv_sec = (long) -1;
+	vattr->va_atime.tv_nsec = (long) -1;
+	vattr->va_mtime.tv_sec = (long) -1;
+	vattr->va_mtime.tv_nsec = (long) -1;
+	vattr->va_ctime.tv_sec = (long) -1;
+	vattr->va_ctime.tv_nsec = (long) -1;
         vattr->va_type = C_VNON;
 	vattr->va_fileid = -1;
 	vattr->va_gen = -1;
@@ -175,13 +201,13 @@ void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr)
                 vattr->va_size = iattr->ia_size;
 	}
         if ( valid & ATTR_ATIME ) {
-		vattr->va_atime = timespec64_to_timespec(iattr->ia_atime);
+		vattr->va_atime = timespec64_to_coda(iattr->ia_atime);
 	}
         if ( valid & ATTR_MTIME ) {
-		vattr->va_mtime = timespec64_to_timespec(iattr->ia_mtime);
+		vattr->va_mtime = timespec64_to_coda(iattr->ia_mtime);
 	}
         if ( valid & ATTR_CTIME ) {
-		vattr->va_ctime = timespec64_to_timespec(iattr->ia_ctime);
+		vattr->va_ctime = timespec64_to_coda(iattr->ia_ctime);
 	}
 }