4082 zfs receive gets EFBIG from dmu_tx_hold_free()
Reviewed by: Eric Schrock <eric.schrock@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>

*** 603,613 ****
          if (off >= (dn->dn_maxblkid+1) * dn->dn_datablksz)
                  return;
          if (len == DMU_OBJECT_END)
                  len = (dn->dn_maxblkid+1) * dn->dn_datablksz - off;
  
- 
          /*
           * For i/o error checking, we read the first and last level-0
           * blocks if they are not aligned, and all the level-1 blocks.
           *
           * Note:  dbuf_free_range() assumes that we have not instantiated
--- 603,612 ----
*** 615,625 ****
           * exercise care to not read or count the first and last blocks
           * if they are blocksize-aligned.
           */
          if (dn->dn_datablkshift == 0) {
                  if (off != 0 || len < dn->dn_datablksz)
!                         dmu_tx_count_write(txh, off, len);
          } else {
                  /* first block will be modified if it is not aligned */
                  if (!IS_P2ALIGNED(off, 1 << dn->dn_datablkshift))
                          dmu_tx_count_write(txh, off, 1);
                  /* last block will be modified if it is not aligned */
--- 614,624 ----
           * exercise care to not read or count the first and last blocks
           * if they are blocksize-aligned.
           */
          if (dn->dn_datablkshift == 0) {
                  if (off != 0 || len < dn->dn_datablksz)
!                         dmu_tx_count_write(txh, 0, dn->dn_datablksz);
          } else {
                  /* first block will be modified if it is not aligned */
                  if (!IS_P2ALIGNED(off, 1 << dn->dn_datablkshift))
                          dmu_tx_count_write(txh, off, 1);
                  /* last block will be modified if it is not aligned */