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[PATCH] xfs_copy: fix copy of hard 4k devices

To: xfs-oss <xfs@xxxxxxxxxxx>
Subject: [PATCH] xfs_copy: fix copy of hard 4k devices
From: Eric Sandeen <sandeen@xxxxxxxxxx>
Date: Wed, 17 Jun 2015 14:24:18 -0500
Delivered-to: xfs@xxxxxxxxxxx
If we have a pure 4k device with no 512 emulation, xfs_copy
fails straightaway because it tries to do a 512-byte direct
IO read of the superblock.

Do like we do in xfs_db, and read in the max possible sector size,
because we don't yet know what the filesystem's sector size is.

This fixes a failure in xfs/032 on a hard 4k device.

Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
---

diff --git a/copy/xfs_copy.c b/copy/xfs_copy.c
index 279527c..b39c84d 100644
--- a/copy/xfs_copy.c
+++ b/copy/xfs_copy.c
@@ -654,8 +654,9 @@ main(int argc, char **argv)
 
        memset(&mbuf, 0, sizeof(xfs_mount_t));
        libxfs_buftarg_init(&mbuf, xargs.ddev, xargs.logdev, xargs.rtdev);
-       sbp = libxfs_readbuf(mbuf.m_ddev_targp, XFS_SB_DADDR, 1, 0,
-                                                       &xfs_sb_buf_ops);
+       sbp = libxfs_readbuf(mbuf.m_ddev_targp, XFS_SB_DADDR,
+                            1 << (XFS_MAX_SECTORSIZE_LOG - BBSHIFT),
+                            0, &xfs_sb_buf_ops);
        sb = &mbuf.m_sb;
        libxfs_sb_from_disk(sb, XFS_BUF_TO_SBP(sbp));
 

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