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Subject[PATCH v2 03/12] nfsd: handle nfs3 timestamps as unsigned
Date
The decode_time3 function behaves differently on 32-bit
and 64-bit architectures: on the former, a 32-bit timestamp
gets converted into an signed number and then into a timestamp
between 1902 and 2038, while on the latter it is interpreted
as unsigned in the range 1970-2106.

Change all the remaining 'timespec' in nfsd to 'timespec64'
to make the behavior the same, and use the current interpretation
of the dominant 64-bit architectures.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
fs/nfsd/nfs3xdr.c | 20 ++++++++------------
fs/nfsd/nfsfh.h | 4 ++--
2 files changed, 10 insertions(+), 14 deletions(-)

diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c
index 195ab7a0fc89..c997b710af27 100644
--- a/fs/nfsd/nfs3xdr.c
+++ b/fs/nfsd/nfs3xdr.c
@@ -32,14 +32,14 @@ static u32 nfs3_ftypes[] = {
* XDR functions for basic NFS types
*/
static __be32 *
-encode_time3(__be32 *p, struct timespec *time)
+encode_time3(__be32 *p, struct timespec64 *time)
{
*p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
return p;
}

static __be32 *
-decode_time3(__be32 *p, struct timespec *time)
+decode_time3(__be32 *p, struct timespec64 *time)
{
time->tv_sec = ntohl(*p++);
time->tv_nsec = ntohl(*p++);
@@ -167,7 +167,6 @@ encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
struct kstat *stat)
{
struct user_namespace *userns = nfsd_user_namespace(rqstp);
- struct timespec ts;
*p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
*p++ = htonl((u32) (stat->mode & S_IALLUGO));
*p++ = htonl((u32) stat->nlink);
@@ -183,12 +182,9 @@ encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
*p++ = htonl((u32) MINOR(stat->rdev));
p = encode_fsid(p, fhp);
p = xdr_encode_hyper(p, stat->ino);
- ts = timespec64_to_timespec(stat->atime);
- p = encode_time3(p, &ts);
- ts = timespec64_to_timespec(stat->mtime);
- p = encode_time3(p, &ts);
- ts = timespec64_to_timespec(stat->ctime);
- p = encode_time3(p, &ts);
+ p = encode_time3(p, &stat->atime);
+ p = encode_time3(p, &stat->mtime);
+ p = encode_time3(p, &stat->ctime);

return p;
}
@@ -277,8 +273,8 @@ void fill_pre_wcc(struct svc_fh *fhp)
stat.size = inode->i_size;
}

- fhp->fh_pre_mtime = timespec64_to_timespec(stat.mtime);
- fhp->fh_pre_ctime = timespec64_to_timespec(stat.ctime);
+ fhp->fh_pre_mtime = stat.mtime;
+ fhp->fh_pre_ctime = stat.ctime;
fhp->fh_pre_size = stat.size;
fhp->fh_pre_change = nfsd4_change_attribute(&stat, inode);
fhp->fh_pre_saved = true;
@@ -330,7 +326,7 @@ nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));

if ((args->check_guard = ntohl(*p++)) != 0) {
- struct timespec time;
+ struct timespec64 time;
p = decode_time3(p, &time);
args->guardtime = time.tv_sec;
}
diff --git a/fs/nfsd/nfsfh.h b/fs/nfsd/nfsfh.h
index 755e256a9103..495540a248a1 100644
--- a/fs/nfsd/nfsfh.h
+++ b/fs/nfsd/nfsfh.h
@@ -42,8 +42,8 @@ typedef struct svc_fh {

/* Pre-op attributes saved during fh_lock */
__u64 fh_pre_size; /* size before operation */
- struct timespec fh_pre_mtime; /* mtime before oper */
- struct timespec fh_pre_ctime; /* ctime before oper */
+ struct timespec64 fh_pre_mtime; /* mtime before oper */
+ struct timespec64 fh_pre_ctime; /* ctime before oper */
/*
* pre-op nfsv4 change attr: note must check IS_I_VERSION(inode)
* to find out if it is valid.
--
2.20.0
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