zpl: handle suspend from two remaining calls to txg_wait_synced()

* zfs_link: allow tempfile sync to fail if pool suspends

4653e2f (openzfs#17355) allows dmu_tx_assign() to fail if the pool suspends
when failmode=continue, but zfs_link() can fall back to
txg_wait_synced() if it has to wait for a tempfile to be fully created
before continuing, which will block if the pool suspends.

Handle this by requesting an error return if the pool suspends when
failmode=continue, and if that happens, return EIO.

* zfs_clone_range: allow dirty wait to fail if pool suspends

4653e2f (openzfs#17355) allows dmu_tx_assign() to fail if the pool suspends
when failmode=continue, but zfs_clone_range() can fall back to
txg_wait_synced() if it has to wait for a dirty block to be written out,
which will block if the pool suspends.

Handle this by requesting an error return if the pool suspends when
failmode=continue, and if that happens, return EIO.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Closes openzfs#17413

Author: robn

module/os/linux/zfs/zfs_vnops_os.c

@@ -3672,8 +3672,17 @@ zfs_link(znode_t *tdzp, znode_t *szp, char *name, cred_t *cr,
 	if (!is_tmpfile && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
 		zil_commit(zilog, 0);
 
-	if (is_tmpfile && zfsvfs->z_os->os_sync != ZFS_SYNC_DISABLED)
-		txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), txg);
+	if (is_tmpfile && zfsvfs->z_os->os_sync != ZFS_SYNC_DISABLED) {
+		txg_wait_flag_t wait_flags =
+		    spa_get_failmode(dmu_objset_spa(zfsvfs->z_os)) ==
+		    ZIO_FAILURE_MODE_CONTINUE ? TXG_WAIT_SUSPEND : 0;
+		error = txg_wait_synced_flags(dmu_objset_pool(zfsvfs->z_os),
+		    txg, wait_flags);
+		if (error != 0) {
+			ASSERT3U(error, ==, ESHUTDOWN);
+			error = SET_ERROR(EIO);
+		}
+	}
 
 	zfs_znode_update_vfs(tdzp);
 	zfs_znode_update_vfs(szp);

module/zfs/zfs_vnops.c

@@ -1813,9 +1813,17 @@ zfs_clone_range(znode_t *inzp, uint64_t *inoffp, znode_t *outzp,
 			 * fallback, or wait for the next TXG and check again.
 			 */
 			if (error == EAGAIN && zfs_bclone_wait_dirty) {
-				txg_wait_synced(dmu_objset_pool(inos),
-				    last_synced_txg + 1);
-				continue;
+				txg_wait_flag_t wait_flags =
+				    spa_get_failmode(dmu_objset_spa(inos)) ==
+				    ZIO_FAILURE_MODE_CONTINUE ?
+				    TXG_WAIT_SUSPEND : 0;
+				error = txg_wait_synced_flags(
+				    dmu_objset_pool(inos), last_synced_txg + 1,
+				    wait_flags);
+				if (error == 0)
+					continue;
+				ASSERT3U(error, ==, ESHUTDOWN);
+				error = SET_ERROR(EIO);
 			}
 
 			break;