posix: add storage.reserve-size option

storage.reserve-size option will take size as input
instead of percentage. If set, priority will be given to
storage.reserve-size over storage.reserve. Default value
of this option is 0.

fixes: bz#1651445
Change-Id: I7a7342c68e436e8bf65bd39c567512ee04abbcea
Signed-off-by: Sheetal Pamecha <sheetal.pamecha08@gmail.com>

1 files changed, 10 insertions, 3 deletions

diff --git a/xlators/storage/posix/src/posix-helpers.c b/xlators/storage/posix/src/posix-helpers.c
index 80f5fb8514c..7296f698db0 100644
--- a/xlators/storage/posix/src/posix-helpers.c
+++ b/xlators/storage/posix/src/posix-helpers.c
@@ -2265,6 +2265,7 @@ posix_disk_space_check(xlator_t *this)
     struct posix_private *priv = NULL;
     char *subvol_path = NULL;
     int op_ret = 0;
+    uint64_t size = 0;
     int percent = 0;
     struct statvfs buf = {0};
     uint64_t totsz = 0;
@@ -2275,7 +2276,14 @@ posix_disk_space_check(xlator_t *this)
     GF_VALIDATE_OR_GOTO(this->name, priv, out);
 
     subvol_path = priv->base_path;
-    percent = priv->disk_reserve;
+
+    if (priv->disk_reserve_size) {
+        size = priv->disk_reserve_size;
+    } else {
+        percent = priv->disk_reserve_percent;
+        totsz = (buf.f_blocks * buf.f_bsize);
+        size = ((totsz * percent) / 100);
+    }
 
     op_ret = sys_statvfs(subvol_path, &buf);
 
@@ -2284,10 +2292,9 @@ posix_disk_space_check(xlator_t *this)
                "statvfs failed on %s", subvol_path);
         goto out;
     }
-    totsz = (buf.f_blocks * buf.f_bsize);
     freesz = (buf.f_bfree * buf.f_bsize);
 
-    if (freesz <= ((totsz * percent) / 100)) {
+    if (freesz <= size) {
         priv->disk_space_full = 1;
     } else {
         priv->disk_space_full = 0;