btrfs-progs: check return of posix_fadvise

It seems highly unlikely that posix_fadvise could fail,
and even if it does, it was only advisory.  Still, if
it does, we could issue a notice to the user.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/volumes.c b/volumes.c
index ca1b4025..c0d02d13 100644
--- a/volumes.c
+++ b/volumes.c
@@ -193,7 +193,8 @@ int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, int flags)
 			goto fail;
 		}
 
-		posix_fadvise(fd, 0, 0, POSIX_FADV_DONTNEED);
+		if (posix_fadvise(fd, 0, 0, POSIX_FADV_DONTNEED))
+			fprintf(stderr, "Warning, could not drop caches\n");
 
 		if (device->devid == fs_devices->latest_devid)
 			fs_devices->latest_bdev = fd;