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Fix range locking in ZIL commit codepath

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Since OpenZFS 7578 (1b7c1e5) if we have a ZVOL with logbias=throughput
we will force WR_INDIRECT itxs in zvol_log_write() setting itx->itx_lr
offset and length to the offset and length of the BIO from
zvol_write()->zvol_log_write(): these offset and length are later used
to take a range lock in zillog->zl_get_data function: zvol_get_data().

Now suppose we have a ZVOL with blocksize=8K and push 4K writes to
offset 0: we will only be range-locking 0-4096. This means the
ASSERTion we make in dbuf_unoverride() is no longer valid because now
dmu_sync() is called from zilog's get_data functions holding a partial
lock on the dbuf.

Fix this by taking a range lock on the whole block in zvol_get_data().

Reviewed-by: Chunwei Chen <tuxoko@gmail.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: loli10K <ezomori.nozomu@gmail.com>
Closes #6238 
Closes #6315 
Closes #6356 
Closes #6477
This commit is contained in:
LOLi
2017-08-21 17:59:48 +02:00
committed by Brian Behlendorf
parent 08de8c16f5
commit f763c3d1df
7 changed files with 123 additions and 14 deletions
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tests/runfiles/linux.run
+1 -1
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@@ -594,7 +594,7 @@ tests = ['zvol_cli_001_pos', 'zvol_cli_002_pos', 'zvol_cli_003_neg']
[tests/functional/zvol/zvol_misc]
tests = ['zvol_misc_001_neg', 'zvol_misc_002_pos', 'zvol_misc_003_neg',
'zvol_misc_004_pos', 'zvol_misc_005_neg', 'zvol_misc_006_pos',
'zvol_misc_snapdev', 'zvol_misc_volmode']
'zvol_misc_snapdev', 'zvol_misc_volmode', 'zvol_misc_zil']
[tests/functional/zvol/zvol_swap]
tests = ['zvol_swap_001_pos', 'zvol_swap_002_pos', 'zvol_swap_003_pos',