fuse: improve utimes support

Add two new flags for setattr: FATTR_ATIME_NOW and FATTR_MTIME_NOW.  These
mean, that atime or mtime should be changed to the current time.

Also it is now possible to update atime or mtime individually, not just
together.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 1e941b3..537d38b 100644 (file)
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1014,6 +1014,20 @@ static int fuse_dir_fsync(struct file *file, struct dentry *de, int datasync)
        return file ? fuse_fsync_common(file, de, datasync, 1) : 0;
 }
 
+static bool update_mtime(unsigned ivalid)
+{
+       /* Always update if mtime is explicitly set  */
+       if (ivalid & ATTR_MTIME_SET)
+               return true;
+
+       /* If it's an open(O_TRUNC) or an ftruncate(), don't update */
+       if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE)))
+               return false;
+
+       /* In all other cases update */
+       return true;
+}
+
 static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg)
 {
        unsigned ivalid = iattr->ia_valid;
@@ -1026,11 +1040,19 @@ static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg)
                arg->valid |= FATTR_GID,    arg->gid = iattr->ia_gid;
        if (ivalid & ATTR_SIZE)
                arg->valid |= FATTR_SIZE,   arg->size = iattr->ia_size;
-       /* You can only _set_ these together (they may change by themselves) */
-       if ((ivalid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME)) {
-               arg->valid |= FATTR_ATIME | FATTR_MTIME;
+       if (ivalid & ATTR_ATIME) {
+               arg->valid |= FATTR_ATIME;
                arg->atime = iattr->ia_atime.tv_sec;
+               arg->atimensec = iattr->ia_atime.tv_nsec;
+               if (!(ivalid & ATTR_ATIME_SET))
+                       arg->valid |= FATTR_ATIME_NOW;
+       }
+       if ((ivalid & ATTR_MTIME) && update_mtime(ivalid)) {
+               arg->valid |= FATTR_MTIME;
                arg->mtime = iattr->ia_mtime.tv_sec;
+               arg->mtimensec = iattr->ia_mtime.tv_nsec;
+               if (!(ivalid & ATTR_MTIME_SET))
+                       arg->valid |= FATTR_MTIME_NOW;
        }
 }
 

diff --git a/include/linux/fuse.h b/include/linux/fuse.h
index a50d0d9..43a77d7 100644 (file)
--- a/include/linux/fuse.h
+++ b/include/linux/fuse.h
@@ -83,6 +83,8 @@ struct fuse_file_lock {
 #define FATTR_ATIME    (1 << 4)
 #define FATTR_MTIME    (1 << 5)
 #define FATTR_FH       (1 << 6)
+#define FATTR_ATIME_NOW        (1 << 7)
+#define FATTR_MTIME_NOW        (1 << 8)
 
 /**
  * Flags returned by the OPEN request