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FAR: generating send-streams in portable format
This commit adds a switch '-F' to  zfs send. This set, zfs send generates
a stream in FAR-format instead of the traditional zfs stream format. The
generated send stream is compatible with the stream generated from 'btrfs send'
and can in principle easily be received to any filesystem.


 663         } else {
 664                 dsl_dir_name(ds->ds_dir, name);
 665                 VERIFY(0 == dsl_dataset_get_snapname(ds));
 666                 if (ds->ds_snapname[0]) {
 667                         (void) strcat(name, "@");
 668                         /*
 669                          * We use a "recursive" mutex so that we
 670                          * can call dprintf_ds() with ds_lock held.
 671                          */
 672                         if (!MUTEX_HELD(&ds->ds_lock)) {
 673                                 mutex_enter(&ds->ds_lock);
 674                                 (void) strcat(name, ds->ds_snapname);
 675                                 mutex_exit(&ds->ds_lock);
 676                         } else {
 677                                 (void) strcat(name, ds->ds_snapname);
 678                         }
 679                 }
 680         }
 681 }
 682 
 683 static int
 684 dsl_dataset_namelen(dsl_dataset_t *ds)
 685 {
 686         int result;
 687 
 688         if (ds == NULL) {
 689                 result = 3;     /* "mos" */
 690         } else {
 691                 result = dsl_dir_namelen(ds->ds_dir);
 692                 VERIFY(0 == dsl_dataset_get_snapname(ds));
 693                 if (ds->ds_snapname[0]) {
 694                         ++result;       /* adding one for the @-sign */
 695                         if (!MUTEX_HELD(&ds->ds_lock)) {
 696                                 mutex_enter(&ds->ds_lock);
 697                                 result += strlen(ds->ds_snapname);
 698                                 mutex_exit(&ds->ds_lock);
 699                         } else {
 700                                 result += strlen(ds->ds_snapname);
 701                         }
 702                 }
 703         }




 663         } else {
 664                 dsl_dir_name(ds->ds_dir, name);
 665                 VERIFY(0 == dsl_dataset_get_snapname(ds));
 666                 if (ds->ds_snapname[0]) {
 667                         (void) strcat(name, "@");
 668                         /*
 669                          * We use a "recursive" mutex so that we
 670                          * can call dprintf_ds() with ds_lock held.
 671                          */
 672                         if (!MUTEX_HELD(&ds->ds_lock)) {
 673                                 mutex_enter(&ds->ds_lock);
 674                                 (void) strcat(name, ds->ds_snapname);
 675                                 mutex_exit(&ds->ds_lock);
 676                         } else {
 677                                 (void) strcat(name, ds->ds_snapname);
 678                         }
 679                 }
 680         }
 681 }
 682 
 683 int
 684 dsl_dataset_namelen(dsl_dataset_t *ds)
 685 {
 686         int result;
 687 
 688         if (ds == NULL) {
 689                 result = 3;     /* "mos" */
 690         } else {
 691                 result = dsl_dir_namelen(ds->ds_dir);
 692                 VERIFY(0 == dsl_dataset_get_snapname(ds));
 693                 if (ds->ds_snapname[0]) {
 694                         ++result;       /* adding one for the @-sign */
 695                         if (!MUTEX_HELD(&ds->ds_lock)) {
 696                                 mutex_enter(&ds->ds_lock);
 697                                 result += strlen(ds->ds_snapname);
 698                                 mutex_exit(&ds->ds_lock);
 699                         } else {
 700                                 result += strlen(ds->ds_snapname);
 701                         }
 702                 }
 703         }