D36194.id109302.diff
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D36194.id109302.diff
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	Index: sys/kern/vfs_vnops.c
	===================================================================
	--- sys/kern/vfs_vnops.c
	+++ sys/kern/vfs_vnops.c
	@@ -3268,8 +3268,8 @@
	outvp->v_mount->mnt_stat.f_iosize);
	if (blksize < 4096)
	blksize = 4096;
	- else if (blksize > 1024 * 1024)
	- blksize = 1024 * 1024;
	+ else if (blksize > maxphys)
	+ blksize = maxphys;
	dat = malloc(blksize, M_TEMP, M_WAITOK);

	/*
	@@ -3377,14 +3377,21 @@
	error = 0;
	}

	- xfer = blksize;
	- if (cantseek) {
	+ /*
	+ * We only need to copy in chunks of size _PC_MIN_HOLE_SIZE if
	+ * FIOSEEKDATA or FIOSEEKHOLE return an error and we are going
	+ * to fall back on the "all bytes 0" method.
	+ */
	+ if (__predict_false(cantseek)) {
	+ xfer = blksize;
	/*
	* Set first xfer to end at a block boundary, so that
	* holes are more likely detected in the loop below via
	* the for all bytes 0 method.
	*/
	xfer -= (*inoffp % blksize);
	+ } else {
	+ xfer = maxphys;
	}
	/* Loop copying the data block. */
	while (copylen > 0 && error == 0 && !eof && interrupted == 0) {
	@@ -3441,7 +3448,11 @@
	}
	}
	}
	- xfer = blksize;
	+ if (__predict_false(cantseek)) {
	+ xfer = blksize;
	+ } else {
	+ xfer = maxphys
	+ }
	}
	}
	out: