xfs: update #2 for v3.14-rc1

- allow logical sector sized direct io on 'advanced format' 4k/512 disk.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1.4.10 (GNU/Linux)
 
 iQIcBAABAgAGBQJS6C5lAAoJENaLyazVq6ZOFFMP/Ag3IzyGv9zQ1I1ebqxdGNmU
 8bNVvurN+Az1ISgXkMdcbqNgpVxcWaAcpbJwxWsRBaKBxtBmBWa0TF33XEmrFdmO
 Qqw3qLSsPzIDP5l518/bpn1Q0XhMWO2zss9HtHogw/7WBkB5qQYn94DAwIF1Zrga
 cimpuiVv7u73BnlMJeQl+mqONkuEUl9Oc9lOyDP7lqbAlp3mBDylTs0q99kug8fF
 LSQ+f+06PFKshPzTtcZHhqwMtK7Pd+wPp3B3i0iGvv1GcWWL1adM5HfWPLLQ/85l
 CvdTnKnIWpNvmaEbPtpB+kuz7V3CtnLFIBM1oRiYZoNRNEUG3SkkqH+xSkXY+Wfr
 Wiuplt50vHUvn1tiL6n2GE0QAyTNhcy2RiWzpkIim6S2LUXCmdOKvT9hEEs5ymVl
 Y+VSXwdPEbCHSfhqkg+PXUbWxk+WTkDe9rOMFK4VcTjDuxiWUAiFgVpEHrxjPV4A
 rFPwNgfUpaRMou5SzTZHLuM8YQ75DckDH+O3XpWD4boEfeTGeV3LhlRzLvIkL0I2
 8VB24kV9TPUj+rphh9AckdU3kfN1wIb7ZOjwr008I5udfgPwjoj+kSgnd+k2yPtr
 r/ryHTV+RchbsiYEdriibSgUOtJNdNWnboba1DEDZDSvqALsq5eKWmpm3InE85Ix
 2bN0SdjsTphp/Mc1Mllg
 =c0tN
 -----END PGP SIGNATURE-----

Merge tag 'xfs-for-linus-v3.14-rc1-2' of git://oss.sgi.com/xfs/xfs

Pull second xfs update from Ben Myers:
 "Allow logical sector sized direct io on 'advanced format' 4k/512 disk"

* tag 'xfs-for-linus-v3.14-rc1-2' of git://oss.sgi.com/xfs/xfs:
  xfs: allow logical-sector sized O_DIRECT
  xfs: rename xfs_buftarg structure members
  xfs: clean up xfs_buftarg

fs/xfs/xfs_buf.c

@@ -445,8 +445,8 @@ _xfs_buf_find(
 	numbytes = BBTOB(numblks);
 
 	/* Check for IOs smaller than the sector size / not sector aligned */
-	ASSERT(!(numbytes < (1 << btp->bt_sshift)));
-	ASSERT(!(BBTOB(blkno) & (xfs_off_t)btp->bt_smask));
+	ASSERT(!(numbytes < btp->bt_meta_sectorsize));
+	ASSERT(!(BBTOB(blkno) & (xfs_off_t)btp->bt_meta_sectormask));
 
 	/*
 	 * Corrupted block numbers can get through to here, unfortunately, so we
@@ -1599,9 +1599,9 @@ xfs_setsize_buftarg(
 	unsigned int		blocksize,
 	unsigned int		sectorsize)
 {
-	btp->bt_bsize = blocksize;
-	btp->bt_sshift = ffs(sectorsize) - 1;
-	btp->bt_smask = sectorsize - 1;
+	/* Set up metadata sector size info */
+	btp->bt_meta_sectorsize = sectorsize;
+	btp->bt_meta_sectormask = sectorsize - 1;
 
 	if (set_blocksize(btp->bt_bdev, sectorsize)) {
 		char name[BDEVNAME_SIZE];
@@ -1614,6 +1614,10 @@ xfs_setsize_buftarg(
 		return EINVAL;
 	}
 
+	/* Set up device logical sector size mask */
+	btp->bt_logical_sectorsize = bdev_logical_block_size(btp->bt_bdev);
+	btp->bt_logical_sectormask = bdev_logical_block_size(btp->bt_bdev) - 1;
+
 	return 0;
 }
 

fs/xfs/xfs_buf.h

@@ -88,14 +88,28 @@ typedef unsigned int xfs_buf_flags_t;
  */
 #define XFS_BSTATE_DISPOSE	 (1 << 0)	/* buffer being discarded */
 
+/*
+ * The xfs_buftarg contains 2 notions of "sector size" -
+ *
+ * 1) The metadata sector size, which is the minimum unit and
+ *    alignment of IO which will be performed by metadata operations.
+ * 2) The device logical sector size
+ *
+ * The first is specified at mkfs time, and is stored on-disk in the
+ * superblock's sb_sectsize.
+ *
+ * The latter is derived from the underlying device, and controls direct IO
+ * alignment constraints.
+ */
 typedef struct xfs_buftarg {
 	dev_t			bt_dev;
 	struct block_device	*bt_bdev;
 	struct backing_dev_info	*bt_bdi;
 	struct xfs_mount	*bt_mount;
-	unsigned int		bt_bsize;
-	unsigned int		bt_sshift;
-	size_t			bt_smask;
+	unsigned int		bt_meta_sectorsize;
+	size_t			bt_meta_sectormask;
+	size_t			bt_logical_sectorsize;
+	size_t			bt_logical_sectormask;
 
 	/* LRU control structures */
 	struct shrinker		bt_shrinker;

fs/xfs/xfs_file.c

@@ -261,7 +261,8 @@ xfs_file_aio_read(
 		xfs_buftarg_t	*target =
 			XFS_IS_REALTIME_INODE(ip) ?
 				mp->m_rtdev_targp : mp->m_ddev_targp;
-		if ((pos & target->bt_smask) || (size & target->bt_smask)) {
+		/* DIO must be aligned to device logical sector size */
+		if ((pos | size) & target->bt_logical_sectormask) {
 			if (pos == i_size_read(inode))
 				return 0;
 			return -XFS_ERROR(EINVAL);
@@ -641,9 +642,11 @@ xfs_file_dio_aio_write(
 	struct xfs_buftarg	*target = XFS_IS_REALTIME_INODE(ip) ?
 					mp->m_rtdev_targp : mp->m_ddev_targp;
 
-	if ((pos & target->bt_smask) || (count & target->bt_smask))
+	/* DIO must be aligned to device logical sector size */
+	if ((pos | count) & target->bt_logical_sectormask)
 		return -XFS_ERROR(EINVAL);
 
+	/* "unaligned" here means not aligned to a filesystem block */
 	if ((pos & mp->m_blockmask) || ((pos + count) & mp->m_blockmask))
 		unaligned_io = 1;
 

fs/xfs/xfs_ioctl.c

@@ -1583,7 +1583,7 @@ xfs_file_ioctl(
 			XFS_IS_REALTIME_INODE(ip) ?
 			mp->m_rtdev_targp : mp->m_ddev_targp;
 
-		da.d_mem = da.d_miniosz = 1 << target->bt_sshift;
+		da.d_mem =  da.d_miniosz = target->bt_logical_sectorsize;
 		da.d_maxiosz = INT_MAX & ~(da.d_miniosz - 1);
 
 		if (copy_to_user(arg, &da, sizeof(da)))