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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
module/zfs/dmu_send.c
+20 -12
View File
@@ -2592,7 +2592,11 @@ receive_freeobjects(struct receive_writer_arg *rwa,
else if (err != 0)
return (err);
err = dmu_free_long_object(rwa->os, obj);
if (rwa->raw)
err = dmu_free_long_object_raw(rwa->os, obj);
else
err = dmu_free_long_object(rwa->os, obj);
if (err != 0)
return (err);
@@ -2608,9 +2612,9 @@ noinline static int
receive_write(struct receive_writer_arg *rwa, struct drr_write *drrw,
arc_buf_t *abuf)
{
dmu_tx_t *tx;
dmu_buf_t *bonus;
int err;
dmu_tx_t *tx;
dnode_t *dn;
if (drrw->drr_offset + drrw->drr_logical_size < drrw->drr_offset ||
!DMU_OT_IS_VALID(drrw->drr_type))
@@ -2635,7 +2639,6 @@ receive_write(struct receive_writer_arg *rwa, struct drr_write *drrw,
return (SET_ERROR(EINVAL));
tx = dmu_tx_create(rwa->os);
dmu_tx_hold_write(tx, drrw->drr_object,
drrw->drr_offset, drrw->drr_logical_size);
err = dmu_tx_assign(tx, TXG_WAIT);
@@ -2655,10 +2658,9 @@ receive_write(struct receive_writer_arg *rwa, struct drr_write *drrw,
DRR_WRITE_PAYLOAD_SIZE(drrw));
}
/* use the bonus buf to look up the dnode in dmu_assign_arcbuf */
if (dmu_bonus_hold(rwa->os, drrw->drr_object, FTAG, &bonus) != 0)
return (SET_ERROR(EINVAL));
dmu_assign_arcbuf(bonus, drrw->drr_offset, abuf, tx);
VERIFY0(dnode_hold(rwa->os, drrw->drr_object, FTAG, &dn));
dmu_assign_arcbuf_by_dnode(dn, drrw->drr_offset, abuf, tx);
dnode_rele(dn, FTAG);
/*
* Note: If the receive fails, we want the resume stream to start
@@ -2668,7 +2670,6 @@ receive_write(struct receive_writer_arg *rwa, struct drr_write *drrw,
*/
save_resume_state(rwa, drrw->drr_object, drrw->drr_offset, tx);
dmu_tx_commit(tx);
dmu_buf_rele(bonus, FTAG);
return (0);
}
@@ -2767,6 +2768,8 @@ receive_write_embedded(struct receive_writer_arg *rwa,
return (SET_ERROR(EINVAL));
if (drrwe->drr_compression >= ZIO_COMPRESS_FUNCTIONS)
return (SET_ERROR(EINVAL));
if (rwa->raw)
return (SET_ERROR(EINVAL));
if (drrwe->drr_object > rwa->max_object)
rwa->max_object = drrwe->drr_object;
@@ -2841,7 +2844,7 @@ receive_spill(struct receive_writer_arg *rwa, struct drr_spill *drrs,
if (db_spill->db_size < drrs->drr_length)
VERIFY(0 == dbuf_spill_set_blksz(db_spill,
drrs->drr_length, tx));
dmu_assign_arcbuf_impl(db_spill, abuf, tx);
dbuf_assign_arcbuf((dmu_buf_impl_t *)db_spill, abuf, tx);
dmu_buf_rele(db, FTAG);
dmu_buf_rele(db_spill, FTAG);
@@ -2866,8 +2869,13 @@ receive_free(struct receive_writer_arg *rwa, struct drr_free *drrf)
if (drrf->drr_object > rwa->max_object)
rwa->max_object = drrf->drr_object;
err = dmu_free_long_range(rwa->os, drrf->drr_object,
drrf->drr_offset, drrf->drr_length);
if (rwa->raw) {
err = dmu_free_long_range_raw(rwa->os, drrf->drr_object,
drrf->drr_offset, drrf->drr_length);
} else {
err = dmu_free_long_range(rwa->os, drrf->drr_object,
drrf->drr_offset, drrf->drr_length);
}
return (err);
}