LU-3763 utils: set multipath devices recursively

Make set_blockdev_tunables() set tunables recursively to reach
slaves' slaves.

Signed-off-by: Bobi Jam <bobijam.xu@intel.com>
Change-Id: Ic56e433758c91d3cbf5063f0d5e652b57c607a1e
Reviewed-on: http://review.whamcloud.com/7337
Reviewed-by: Fan Yong <fan.yong@intel.com>
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>

diff --git a/lustre/utils/mount_utils_ldiskfs.c b/lustre/utils/mount_utils_ldiskfs.c
index 7915967..4c75200 100644 (file)
--- a/lustre/utils/mount_utils_ldiskfs.c
+++ b/lustre/utils/mount_utils_ldiskfs.c
@@ -904,7 +904,7 @@ int set_blockdev_scheduler(const char *path, const char *scheduler)
 /* This is to tune the kernel for good SCSI performance.
  * For that we set the value of /sys/block/{dev}/queue/max_sectors_kb
  * to the value of /sys/block/{dev}/queue/max_hw_sectors_kb */
-int set_blockdev_tunables(char *source, struct mount_opts *mop, int fan_out)
+int set_blockdev_tunables(char *source, struct mount_opts *mop)
 {
        glob_t glob_info = { 0 };
        struct stat stat_buf;
@@ -915,6 +915,7 @@ int set_blockdev_tunables(char *source, struct mount_opts *mop, int fan_out)
        char real_path[PATH_MAX] = {'\0'};
        int i, rc = 0;
        int major, minor;
+       char *slave = NULL;
 
        if (!source)
                return -EINVAL;
@@ -1060,45 +1061,42 @@ set_params:
        snprintf(real_path, sizeof(real_path), "%s/%s", path, SCHEDULER_PATH);
        set_blockdev_scheduler(real_path, DEFAULT_SCHEDULER);
 
-       if (fan_out) {
-               char *slave = NULL;
-               glob_info.gl_pathc = 0;
-               glob_info.gl_offs = 0;
-               /* if device is multipath device, tune its slave devices */
-               snprintf(real_path, sizeof(real_path), "%s/slaves/*", path);
-               rc = glob(real_path, GLOB_NOSORT, NULL, &glob_info);
-
-               for (i = 0; rc == 0 && i < glob_info.gl_pathc; i++){
-                       slave = basename(glob_info.gl_pathv[i]);
-                       snprintf(real_path, sizeof(real_path), "/dev/%s", slave);
-                       rc = set_blockdev_tunables(real_path, mop, 0);
-               }
+       /* if device is multipath device, tune its slave devices */
+       glob_info.gl_pathc = 0;
+       glob_info.gl_offs = 0;
+       snprintf(real_path, sizeof(real_path), "%s/slaves/*", path);
+       rc = glob(real_path, GLOB_NOSORT, NULL, &glob_info);
 
-               if (rc == GLOB_NOMATCH) {
-                       /* no slave device is not an error */
-                       rc = 0;
-               } else if (rc && verbose) {
-                       if (slave == NULL) {
-                               fprintf(stderr, "warning: %s, failed to read"
-                                       " entries under %s/slaves\n",
-                                       strerror(errno), path);
-                       } else {
-                               fprintf(stderr, "unable to set tunables for"
-                                       " slave device %s (slave would be"
-                                       " unable to handle IO request from"
-                                       " master %s)\n",
-                                       real_path, source);
-                       }
+       for (i = 0; rc == 0 && i < glob_info.gl_pathc; i++) {
+               slave = basename(glob_info.gl_pathv[i]);
+               snprintf(real_path, sizeof(real_path), "/dev/%s", slave);
+               rc = set_blockdev_tunables(real_path, mop);
+       }
+
+       if (rc == GLOB_NOMATCH) {
+               /* no slave device is not an error */
+               rc = 0;
+       } else if (rc && verbose) {
+               if (slave == NULL) {
+                       fprintf(stderr, "warning: %s, failed to read"
+                               " entries under %s/slaves\n",
+                               strerror(errno), path);
+               } else {
+                       fprintf(stderr, "unable to set tunables for"
+                               " slave device %s (slave would be"
+                               " unable to handle IO request from"
+                               " master %s)\n",
+                               real_path, source);
                }
-               globfree(&glob_info);
        }
+       globfree(&glob_info);
 
        return rc;
 }
 
 int ldiskfs_tune_lustre(char *dev, struct mount_opts *mop)
 {
-       return set_blockdev_tunables(dev, mop, 1);
+       return set_blockdev_tunables(dev, mop);
 }
 
 int ldiskfs_label_lustre(struct mount_opts *mop)