Skip dbuf_evict_one() from dbuf_evict_notify() for reclaim thread

Avoid calling dbuf_evict_one() from memory reclaim contexts (e.g. Linux
kswapd, FreeBSD pagedaemon). This prevents deadlock caused by reclaim
threads waiting for the dbuf hash lock in the call sequence:
dbuf_evict_one -> dbuf_destroy -> arc_buf_destroy

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Kaitlin Hoang <kthoang@amazon.com>
Closes #17561

include/os/freebsd/spl/sys/misc.h

@@ -56,4 +56,9 @@ struct opensolaris_utsname {
 #define	task_io_account_read(n)
 #define	task_io_account_write(n)
 
+/*
+ * Check if the current thread is a memory reclaim thread.
+ */
+extern int current_is_reclaim_thread(void);
+
 #endif	/* _OPENSOLARIS_SYS_MISC_H_ */

include/os/linux/spl/sys/misc.h

@@ -24,7 +24,13 @@
 #define	_OS_LINUX_SPL_MISC_H
 
 #include <linux/kobject.h>
+#include <linux/swap.h>
 
 extern void spl_signal_kobj_evt(struct block_device *bdev);
 
+/*
+ * Check if the current thread is a memory reclaim thread.
+ */
+extern int current_is_reclaim_thread(void);
+
 #endif