LU-715 lov: fix procfs reporting for qos values

When writing to
/proc/fs/lustre/lov/<fsname>-mdtlov/{qos_prio_free,qos_threshold_rr},
the values read back are often one less than the values written.
This happens because internally the value is stored as a number from
0-255 but accessed by the user with 0-100. Integer truncation in the
storage and retrieval stages causes this to often show lower. Adding
255 to an internal step causes the bit-shift to "round up".

Signed-off-by: Matt Ezell <ezell@nics.utk.edu>
Change-Id: I9050aadb55bfa82d14b94a78e399d315249ac48f
Reviewed-on: http://review.whamcloud.com/1532
Tested-by: Hudson
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>

diff --git a/lustre/lov/lproc_lov.c b/lustre/lov/lproc_lov.c
index d9d3d91..c831e98 100644 (file)
--- a/lustre/lov/lproc_lov.c
+++ b/lustre/lov/lproc_lov.c
@@ -213,7 +213,7 @@ static int lov_rd_qos_priofree(char *page, char **start, off_t off, int count,
         lov = &dev->u.lov;
         *eof = 1;
         return snprintf(page, count, "%d%%\n", 
         lov = &dev->u.lov;
         *eof = 1;
         return snprintf(page, count, "%d%%\n", 

-                        (lov->lov_qos.lq_prio_free * 100) >> 8);
+                        (lov->lov_qos.lq_prio_free * 100 + 255) >> 8);

 }
 
 static int lov_wr_qos_priofree(struct file *file, const char *buffer,
 }
 
 static int lov_wr_qos_priofree(struct file *file, const char *buffer,


@@ -247,7 +247,7 @@ static int lov_rd_qos_thresholdrr(char *page, char **start, off_t off,
         lov = &dev->u.lov;
         *eof = 1;
         return snprintf(page, count, "%d%%\n",
         lov = &dev->u.lov;
         *eof = 1;
         return snprintf(page, count, "%d%%\n",

-                        (lov->lov_qos.lq_threshold_rr * 100) >> 8);
+                        (lov->lov_qos.lq_threshold_rr * 100 + 255) >> 8);

 }
 
 static int lov_wr_qos_thresholdrr(struct file *file, const char *buffer,
 }
 
 static int lov_wr_qos_thresholdrr(struct file *file, const char *buffer,