[Qemu-devel] [PATCH 4/7] block/raw-posix: create translate_err helper to merge errno values

["Denis V. Lunev" <den@openvz.org>]

actually the code
    if (ret == -ENODEV || ret == -ENOSYS || ret == -EOPNOTSUPP ||
        ret == -ENOTTY) {
        ret = -ENOTSUP;
    }
is present twice and will be added a couple more times. Create helper
for this. Place it into do_fallocate() for further convinience.

Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Kevin Wolf <kwolf@redhat.com>
CC: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/raw-posix.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/block/raw-posix.c b/block/raw-posix.c
index a7c8816..25a6947 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -894,6 +894,15 @@ static int xfs_discard(BDRVRawState *s, int64_t offset, uint64_t bytes)
 #endif
 
 
+static int translate_err(int err)
+{
+    if (err == -ENODEV || err == -ENOSYS || err == -EOPNOTSUPP ||
+        err == -ENOTTY) {
+        err = -ENOTSUP;
+    }
+    return err;
+}
+
 #if defined(CONFIG_FALLOCATE_PUNCH_HOLE) || defined(CONFIG_FALLOCATE_ZERO_RANGE)
 static int do_fallocate(int fd, int mode, off_t offset, off_t len)
 {
@@ -902,7 +911,7 @@ static int do_fallocate(int fd, int mode, off_t offset, off_t len)
             return 0;
         }
     } while (errno == EINTR);
-    return -errno;
+    return translate_err(-errno);
 }
 #endif
 
@@ -939,10 +948,9 @@ static ssize_t handle_aiocb_write_zeroes(RawPosixAIOData *aiocb)
 #endif
     }
 
-    if (ret == -ENODEV || ret == -ENOSYS || ret == -EOPNOTSUPP ||
-        ret == -ENOTTY) {
+    ret = translate_err(ret);
+    if (ret == -ENOTSUP) {
         s->has_write_zeroes = false;
-        ret = -ENOTSUP;
     }
     return ret;
 }
@@ -980,10 +988,9 @@ static ssize_t handle_aiocb_discard(RawPosixAIOData *aiocb)
 #endif
     }
 
-    if (ret == -ENODEV || ret == -ENOSYS || ret == -EOPNOTSUPP ||
-        ret == -ENOTTY) {
+    ret = translate_err(ret);
+    if (ret == -ENOTSUP) {
         s->has_discard = false;
-        ret = -ENOTSUP;
     }
     return ret;
 }
-- 
1.9.1