[PATCH 24/28] open-by-handle.c: use syncfs() rather than sync()

[Dave Chinner <david@fromorbit.com>]

From: Dave Chinner <dchinner@redhat.com>

xfs/183 runs bulkstat_unlink_test to create 100 inodes, unlink on
and bulkstat them. It takes a ridiculously long time to run under
check-parallel because it runs sync() multiple times per iteration:

Ten slowest tests - runtime in seconds:
.....
xfs/183 328

When running check-parallel, sync() can take a -long- time to
run as there can be dozens of filesystems that need to be synced,
not to mention sync getting hung up behind all the mount and
unmounts that are also being run.

Convert the sync() calls to syncfs() so that they only try to sync
the filesystem under test and not the entire system. This avoids
interactions and delays with other tests and mount/unmount
operations, hence allowing both the test and the overall
check-parallel operation to run faster:

xfs/183        4s

Signed-off-by: Dave Chinner <dchinner@redhat.com>
---
 src/bulkstat_unlink_test.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/bulkstat_unlink_test.c b/src/bulkstat_unlink_test.c
index d78cc2ac2..62e5bb978 100644
--- a/src/bulkstat_unlink_test.c
+++ b/src/bulkstat_unlink_test.c
@@ -88,7 +88,7 @@ main(int argc, char *argv[])
 		}
 
 		if (chknb) { /* Get the original number of inodes (lazy) */
-			sync();
+			syncfs(fd[nfiles]);
 			if (xfsctl(dirname, fd[nfiles], XFS_IOC_FSBULKSTAT, &a) != 0) {
 				printf("Warning (%s:%d), xfsctl(XFS_IOC_FSBULKSTAT) FAILED.\n", __FILE__, __LINE__);
 			}
@@ -118,7 +118,7 @@ main(int argc, char *argv[])
 			 *The files are still opened (but unlink()ed) ,
 			 * we should have more inodes than before
 			 */
-			sync();
+			syncfs(fd[nfiles]);
 			last_inode = 0;
 			if (xfsctl(dirname, fd[nfiles], XFS_IOC_FSBULKSTAT, &a) != 0) {
 				printf("Warning (%s:%d), xfsctl(XFS_IOC_FSBULKSTAT) FAILED.\n", __FILE__, __LINE__);
@@ -139,7 +139,7 @@ main(int argc, char *argv[])
 			 * The files are now closed, we should be back to our,
 			 * previous inode count
 			 */
-			sync();
+			syncfs(fd[nfiles]);
 			last_inode = 0;
 			if (xfsctl(dirname, fd[nfiles], XFS_IOC_FSBULKSTAT, &a) != 0) {
 				printf("Warning (%s:%d), xfsctl(XFS_IOC_FSBULKSTAT) FAILED.\n", __FILE__, __LINE__);
@@ -150,7 +150,7 @@ main(int argc, char *argv[])
 			}
 		}
 
-		sync();
+		syncfs(fd[nfiles]);
 		last_inode = 0;
 		for (;;) {
 			if ((e = xfsctl(dirname, fd[nfiles], XFS_IOC_FSBULKSTAT, &a)) < 0) {
@@ -173,11 +173,11 @@ main(int argc, char *argv[])
 			}
 		}
 
-		close(fd[nfiles]);
 		sprintf(fname, "rm -rf %s\n", dirname);
 		system(fname);
 
-		sync();
+		syncfs(fd[nfiles]);
+		close(fd[nfiles]);
 		sleep(2);
 		printf("passed\n");
 	}
-- 
2.45.2