commit 74bc02b2d2272dc88fb98d43e631eb154717f517
author M. Mohan Kumar <mohan@in.ibm.com> Wed Jun 09 19:14:38 2010 +0530
committer Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Wed Sep 08 22:56:39 2010 +0530
tree c3aa59eb04e3683a0f758f3728b45791ebe4e5d9
parent 00ede4c2529b317cf396c02817cadd5ec43953eb

virtio-9p: Do not reset atime

    Current code resets file's atime to 0 when there is a change in mtime.
    This results in resetting the atime to "1970-01-01 05:30:00". For
    example, truncate -s 0 filename results in changing the mtime to the
    truncate time, but resets the atime to "1970-01-01 05:30:00". utime
    system call does not have any provision to set only mtime or atime. So
    change v9fs_wstat_post_chmod function to use utimensat function to change
    the atime and mtime fields. If tv_nsec field is set to the special value
    "UTIME_OMIT", corresponding file time stamp is not updated.

Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>

hw/file-op-9p.h

diff --git a/hw/file-op-9p.h b/hw/file-op-9p.h
index dd82ac7..120c803 100644
--- a/hw/file-op-9p.h
+++ b/hw/file-op-9p.h
@@ -52,7 +52,7 @@
     int (*chmod)(FsContext *, const char *, FsCred *);
     int (*chown)(FsContext *, const char *, FsCred *);
     int (*mknod)(FsContext *, const char *, FsCred *);
-    int (*utime)(FsContext *, const char *, const struct utimbuf *);
+    int (*utimensat)(FsContext *, const char *, const struct timespec *);
     int (*remove)(FsContext *, const char *);
     int (*symlink)(FsContext *, const char *, const char *, FsCred *);
     int (*link)(FsContext *, const char *, const char *);

hw/virtio-9p-local.c

diff --git a/hw/virtio-9p-local.c b/hw/virtio-9p-local.c
index 82f41c6..dd7277b 100644
--- a/hw/virtio-9p-local.c
+++ b/hw/virtio-9p-local.c
@@ -450,10 +450,10 @@
     return -1;
 }
 
-static int local_utime(FsContext *ctx, const char *path,
-                        const struct utimbuf *buf)
+static int local_utimensat(FsContext *s, const char *path,
+		       const struct timespec *buf)
 {
-    return utime(rpath(ctx, path), buf);
+    return utimensat(AT_FDCWD, rpath(s, path), buf, AT_SYMLINK_NOFOLLOW);
 }
 
 static int local_remove(FsContext *ctx, const char *path)
@@ -495,7 +495,7 @@
     .truncate = local_truncate,
     .rename = local_rename,
     .chown = local_chown,
-    .utime = local_utime,
+    .utimensat = local_utimensat,
     .remove = local_remove,
     .fsync = local_fsync,
     .statfs = local_statfs,

hw/virtio-9p.c

diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c
index a8f1735..bd6cba9 100644
--- a/hw/virtio-9p.c
+++ b/hw/virtio-9p.c
@@ -237,10 +237,25 @@
     return s->ops->chown(&s->ctx, path->data, &cred);
 }
 
-static int v9fs_do_utime(V9fsState *s, V9fsString *path,
-                            const struct utimbuf *buf)
+static int v9fs_do_utimensat(V9fsState *s, V9fsString *path, V9fsStat v9stat)
 {
-    return s->ops->utime(&s->ctx, path->data, buf);
+    struct timespec ts[2];
+
+    if (v9stat.atime != -1) {
+        ts[0].tv_sec = v9stat.atime;
+        ts[0].tv_nsec = 0;
+    } else {
+        ts[0].tv_nsec = UTIME_OMIT;
+    }
+
+    if (v9stat.mtime != -1) {
+        ts[1].tv_sec = v9stat.mtime;
+        ts[1].tv_nsec = 0;
+    } else {
+        ts[1].tv_nsec = UTIME_OMIT;
+    }
+
+    return s->ops->utimensat(&s->ctx, path->data, ts);
 }
 
 static int v9fs_do_remove(V9fsState *s, V9fsString *path)
@@ -2325,11 +2340,8 @@
         goto out;
     }
 
-    if (vs->v9stat.mtime != -1) {
-        struct utimbuf tb;
-        tb.actime = 0;
-        tb.modtime = vs->v9stat.mtime;
-        if (v9fs_do_utime(s, &vs->fidp->path, &tb)) {
+    if (vs->v9stat.mtime != -1 || vs->v9stat.atime != -1) {
+        if (v9fs_do_utimensat(s, &vs->fidp->path, vs->v9stat)) {
             err = -errno;
         }
     }