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a430c11f0b
The ->journal_info pointer in the task_struct is reserved for use by filesystems and because the kernel can have multiple file systems on the same stack due to direct reclaim, each filesystem that touches ->journal_info in a callback function will save the value at the start of its frame and restore it at the end of its frame. This allows us to safely use ->journal_info to store a pointer to the taskq's struct in taskq threads so that ZFS code paths can detect the presence of a taskq. This could break if the ZFS code were to use taskq_member from the context of direct reclaim. However, there are no such uses of it in that manner, so this is safe. This eliminates an O(N) list traversal under a spinlock with an O(1) unlocked pointer comparison. Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: tuxoko <tuxoko@gmail.com> Signed-off-by: Tim Chase <tim@chase2k.com> Closes #500 |
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