Illumos 5960, 5925

5960 zfs recv should prefetch indirect blocks
5925 zfs receive -o origin=
Reviewed by: Prakash Surya <[email protected]>
Reviewed by: Matthew Ahrens <[email protected]>

References:
  https://www.illumos.org/issues/5960
  https://www.illumos.org/issues/5925
  https://github.com/illumos/illumos-gate/commit/a2cdcdd

Porting notes:
- [lib/libzfs/libzfs_sendrecv.c]
  - b8864a2 Fix gcc cast warnings
  - 325f023 Add linux kernel device support
  - 5c3f61e Increase Linux pipe buffer size on 'zfs receive'
- [module/zfs/zfs_vnops.c]
  - 3558fd7 Prototype/structure update for Linux
  - c12e3a5 Restructure zfs_readdir() to fix regressions
- [module/zfs/zvol.c]
  - Function @zvol_map_block() isn't needed in ZoL
  - 9965059 Prefetch start and end of volumes
- [module/zfs/dmu.c]
  - Fixed ISO C90 - mixed declarations and code
  - Function dmu_prefetch() 'int i' is initialized before
    the following code block (c90 vs. c99)
- [module/zfs/dbuf.c]
  - fc5bb51 Fix stack dbuf_hold_impl()
  - 9b67f60 Illumos 4757, 4913
  - 34229a2 Reduce stack usage for recursive traverse_visitbp()
- [module/zfs/dmu_send.c]
  - Fixed ISO C90 - mixed declarations and code
  - b58986e Use large stacks when available
  - 241b541 Illumos 5959 - clean up per-dataset feature count code
  - 77aef6f Use vmem_alloc() for nvlists
  - 00b4602 Add linux kernel memory support

Ported-by: kernelOfTruth [email protected]
Signed-off-by: Brian Behlendorf <[email protected]>

1 files changed, 11 insertions, 1 deletions

diff --git a/include/sys/zfs_context.h b/include/sys/zfs_context.h
index 2a749d840..036235e2b 100644
--- a/include/sys/zfs_context.h
+++ b/include/sys/zfs_context.h
@@ -160,8 +160,18 @@ extern int aok;
 
 /*
  * DTrace SDT probes have different signatures in userland than they do in
- * kernel.  If they're being used in kernel code, re-define them out of
+ * the kernel.  If they're being used in kernel code, re-define them out of
  * existence for their counterparts in libzpool.
+ *
+ * Here's an example of how to use the set-error probes in userland:
+ * zfs$target:::set-error /arg0 == EBUSY/ {stack();}
+ *
+ * Here's an example of how to use DTRACE_PROBE probes in userland:
+ * If there is a probe declared as follows:
+ * DTRACE_PROBE2(zfs__probe_name, uint64_t, blkid, dnode_t *, dn);
+ * Then you can use it as follows:
+ * zfs$target:::probe2 /copyinstr(arg0) == "zfs__probe_name"/
+ *     {printf("%u %p\n", arg1, arg2);}
  */
 
 #ifdef DTRACE_PROBE