[xserver-xorg][PATCH 1/1] xwayland: ftruncate if posix_fallocate fails

[Ian Ray]

On a slow system that is configured with SMART_SCHEDULE_POSSIBLE, large
posix_fallocate() requests may be interrupted by the SmartScheduleTimer
(SIGALRM) continuously. Fallback to ftruncate if posix_fallocate fails.

Signed-off-by: Ian Ray <ian.ray at ge.com>
---
 hw/xwayland/xwayland-shm.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/hw/xwayland/xwayland-shm.c b/hw/xwayland/xwayland-shm.c
index e8545b3..342b723 100644
--- a/hw/xwayland/xwayland-shm.c
+++ b/hw/xwayland/xwayland-shm.c
@@ -142,9 +142,12 @@ os_create_anonymous_file(off_t size)
 #ifdef HAVE_POSIX_FALLOCATE
     ret = posix_fallocate(fd, 0, size);
     if (ret != 0) {
-        close(fd);
-        errno = ret;
-        return -1;
+        /* Fallback to ftruncate in case of failure. */
+        ret = ftruncate(fd, size);
+        if (ret < 0) {
+            close(fd);
+            return -1;
+        }
     }
 #else
     ret = ftruncate(fd, size);
-- 
2.4.5