X-Git-Url: https://git.camperquake.de/gitweb.cgi?a=blobdiff_plain;f=module%2Fzfs%2Fdmu_send.c;h=b2568036025b644438f431a7bf28d8ef042ec7cb;hb=e51be06697762215dc3b679f8668987034a5a048;hp=921c3d76f470ea0c806052cee55c41c1ab2c3e36;hpb=dd26aa535b395735ca61ea2a3e618aded45eb05e;p=zfs.git

diff --git a/module/zfs/dmu_send.c b/module/zfs/dmu_send.c
index 921c3d7..b256803 100644
--- a/module/zfs/dmu_send.c
+++ b/module/zfs/dmu_send.c
@@ -39,6 +39,7 @@
 #include <sys/dsl_prop.h>
 #include <sys/dsl_pool.h>
 #include <sys/dsl_synctask.h>
+#include <sys/spa_impl.h>
 #include <sys/zfs_ioctl.h>
 #include <sys/zap.h>
 #include <sys/zio_checksum.h>
@@ -53,21 +54,48 @@ int zfs_send_corrupt_data = B_FALSE;
 
 static char *dmu_recv_tag = "dmu_recv_tag";
 
-static int
-dump_bytes(dmu_sendarg_t *dsp, void *buf, int len)
+typedef struct dump_bytes_io {
+	dmu_sendarg_t	*dbi_dsp;
+	void		*dbi_buf;
+	int		dbi_len;
+} dump_bytes_io_t;
+
+static void
+dump_bytes_strategy(void *arg)
 {
+	dump_bytes_io_t *dbi = (dump_bytes_io_t *)arg;
+	dmu_sendarg_t *dsp = dbi->dbi_dsp;
 	dsl_dataset_t *ds = dsp->dsa_os->os_dsl_dataset;
 	ssize_t resid; /* have to get resid to get detailed errno */
-	ASSERT3U(len % 8, ==, 0);
+	ASSERT0(dbi->dbi_len % 8);
 
-	fletcher_4_incremental_native(buf, len, &dsp->dsa_zc);
+	fletcher_4_incremental_native(dbi->dbi_buf, dbi->dbi_len, &dsp->dsa_zc);
 	dsp->dsa_err = vn_rdwr(UIO_WRITE, dsp->dsa_vp,
-	    (caddr_t)buf, len,
+	    (caddr_t)dbi->dbi_buf, dbi->dbi_len,
 	    0, UIO_SYSSPACE, FAPPEND, RLIM64_INFINITY, CRED(), &resid);
 
 	mutex_enter(&ds->ds_sendstream_lock);
-	*dsp->dsa_off += len;
+	*dsp->dsa_off += dbi->dbi_len;
 	mutex_exit(&ds->ds_sendstream_lock);
+}
+
+static int
+dump_bytes(dmu_sendarg_t *dsp, void *buf, int len)
+{
+	dump_bytes_io_t dbi;
+
+	dbi.dbi_dsp = dsp;
+	dbi.dbi_buf = buf;
+	dbi.dbi_len = len;
+
+	/*
+	 * The vn_rdwr() call is performed in a taskq to ensure that there is
+	 * always enough stack space to write safely to the target filesystem.
+	 * The ZIO_TYPE_FREE threads are used because there can be a lot of
+	 * them and they are used in vdev_file.c for a similar purpose.
+	 */
+	spa_taskq_dispatch_sync(dmu_objset_spa(dsp->dsa_os), ZIO_TYPE_FREE,
+	    ZIO_TASKQ_ISSUE, dump_bytes_strategy, &dbi, TQ_SLEEP);
 
 	return (dsp->dsa_err);
 }
@@ -960,7 +988,7 @@ restore_read(struct restorearg *ra, int len)
 	int done = 0;
 
 	/* some things will require 8-byte alignment, so everything must */
-	ASSERT3U(len % 8, ==, 0);
+	ASSERT0(len % 8);
 
 	while (done < len) {
 		ssize_t resid;
@@ -1639,7 +1667,7 @@ out:
 		(void) add_ds_to_guidmap(drc->drc_guid_to_ds_map, ds);
 	dsl_dataset_disown(ds, dmu_recv_tag);
 	myerr = dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag, B_FALSE);
-	ASSERT3U(myerr, ==, 0);
+	ASSERT0(myerr);
 	return (err);
 }