Brian Behlendorf 4dd18932ba Avoid 128K kmem allocations in mzap_upgrade() ... As originally implemented the mzap_upgrade() function will perform up to SPA_MAXBLOCKSIZE allocations using kmem_alloc(). These large allocations can potentially block indefinitely if contiguous memory is not available. Since this allocation is done under the zap->zap_rwlock it can appear as if there is a deadlock in zap_lockdir(). This is shown below. The optimal fix for this would be to rework mzap_upgrade() such that no large allocations are required. This could be done but it would result in us diverging further from the other implementations. Therefore I've opted against doing this unless it becomes absolutely necessary. Instead mzap_upgrade() has been updated to use zio_buf_alloc() which can reliably provide buffers of up to SPA_MAXBLOCKSIZE. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Richard Yao <ryao@gentoo.org> Close #2580		2014-08-11 16:10:32 -07:00
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avl	Add module versioning	2013-12-06 09:34:41 -08:00
nvpair	Fix nvlist 'Bus Error' for Sparc	2014-01-09 15:50:15 -08:00
unicode	cstyle: Resolve C style issues	2013-12-18 16:46:35 -08:00
zcommon	Illumos 4390 - I/O errors can corrupt space map when deleting fs/vol	2014-08-04 11:50:52 -07:00
zfs	Avoid 128K kmem allocations in mzap_upgrade()	2014-08-11 16:10:32 -07:00
zpios	cstyle: Resolve C style issues	2013-12-18 16:46:35 -08:00
.gitignore	gitignore: anchor entries at their respective directory	2013-04-02 10:50:17 -07:00
Makefile.in	Add KMODDIR to install target	2013-03-06 15:46:40 -08:00