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Fixes for #6639

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Several issues were uncovered by running stress tests with zfs
encryption and raw sends in particular. The issues and their
associated fixes are as follows:

* arc_read_done() has the ability to chain several requests for
  the same block of data via the arc_callback_t struct. In these
  cases, the ARC would only use the first request's dsobj from
  the bookmark to decrypt the data. This is problematic because
  the first request might be a prefetch zio which is able to
  handle the key not being loaded, while the second might use a
  different key that it is sure will work. The fix here is to
  pass the dsobj with each individual arc_callback_t so that each
  request can attempt to decrypt the data separately.

* DRR_FREE and DRR_FREEOBJECT records in a send file were not
  having their transactions properly tagged as raw during raw
  sends, which caused a panic when the dbuf code attempted to
  decrypt these blocks.

* traverse_prefetch_metadata() did not properly set
  ZIO_FLAG_SPECULATIVE when issuing prefetch IOs.

* Added a few asserts and code cleanups to ensure these issues
  are more detectable in the future.

Signed-off-by: Tom Caputi <tcaputi@datto.com>
This commit is contained in:
Tom Caputi
2017-09-28 11:49:13 -04:00
parent 4807c0badb
commit 440a3eb939
9 changed files with 162 additions and 75 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/sys/arc_impl.h
+1
View File
@@ -96,6 +96,7 @@ struct arc_callback {
boolean_t acb_encrypted;
boolean_t acb_compressed;
boolean_t acb_noauth;
uint64_t acb_dsobj;
zio_t *acb_zio_dummy;
arc_callback_t *acb_next;
};
include/sys/dmu.h
+10 -6
View File
@@ -759,10 +759,13 @@ void dmu_tx_callback_register(dmu_tx_t *tx, dmu_tx_callback_func_t *dcb_func,
* -1, the range from offset to end-of-file is freed.
*/
int dmu_free_range(objset_t *os, uint64_t object, uint64_t offset,
uint64_t size, dmu_tx_t *tx);
uint64_t size, dmu_tx_t *tx);
int dmu_free_long_range(objset_t *os, uint64_t object, uint64_t offset,
uint64_t size);
uint64_t size);
int dmu_free_long_range_raw(objset_t *os, uint64_t object, uint64_t offset,
uint64_t size);
int dmu_free_long_object(objset_t *os, uint64_t object);
int dmu_free_long_object_raw(objset_t *os, uint64_t object);
/*
* Convenience functions.
@@ -797,10 +800,11 @@ int dmu_write_uio_dnode(dnode_t *dn, struct uio *uio, uint64_t size,
#endif
struct arc_buf *dmu_request_arcbuf(dmu_buf_t *handle, int size);
void dmu_return_arcbuf(struct arc_buf *buf);
void dmu_assign_arcbuf(dmu_buf_t *handle, uint64_t offset, struct arc_buf *buf,
dmu_tx_t *tx);
void dmu_assign_arcbuf_impl(dmu_buf_t *handle, struct arc_buf *buf,
dmu_tx_t *tx);
void dmu_assign_arcbuf_by_dnode(dnode_t *dn, uint64_t offset,
struct arc_buf *buf, dmu_tx_t *tx);
void dmu_assign_arcbuf_by_dbuf(dmu_buf_t *handle, uint64_t offset,
struct arc_buf *buf, dmu_tx_t *tx);
#define dmu_assign_arcbuf dmu_assign_arcbuf_by_dbuf
void dmu_convert_to_raw(dmu_buf_t *handle, boolean_t byteorder,
const uint8_t *salt, const uint8_t *iv, const uint8_t *mac, dmu_tx_t *tx);
void dmu_copy_from_buf(objset_t *os, uint64_t object, uint64_t offset,