[XFS] inode items and EFI/EFDs have different ondisk format for 32bit and

64bit kernels allow recovery to handle both versions and do the necessary
decoding

SGI-PV: 952214
SGI-Modid: xfs-linux-melb:xfs-kern:26011a

Signed-off-by: Tim Shimmin <tes@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c
index 7497a481b2f..cd65a565b4f 100644
--- a/fs/xfs/xfs_inode_item.c
+++ b/fs/xfs/xfs_inode_item.c
@@ -1084,3 +1084,52 @@ xfs_istale_done(
 {
 	xfs_iflush_abort(iip->ili_inode);
 }
+
+/*
+ * convert an xfs_inode_log_format struct from either 32 or 64 bit versions
+ * (which can have different field alignments) to the native version
+ */
+int
+xfs_inode_item_format_convert(
+	xfs_log_iovec_t		*buf,
+	xfs_inode_log_format_t	*in_f)
+{
+	if (buf->i_len == sizeof(xfs_inode_log_format_32_t)) {
+		xfs_inode_log_format_32_t *in_f32;
+
+		in_f32 = (xfs_inode_log_format_32_t *)buf->i_addr;
+		in_f->ilf_type = in_f32->ilf_type;
+		in_f->ilf_size = in_f32->ilf_size;
+		in_f->ilf_fields = in_f32->ilf_fields;
+		in_f->ilf_asize = in_f32->ilf_asize;
+		in_f->ilf_dsize = in_f32->ilf_dsize;
+		in_f->ilf_ino = in_f32->ilf_ino;
+		/* copy biggest field of ilf_u */
+		memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
+		       in_f32->ilf_u.ilfu_uuid.__u_bits,
+		       sizeof(uuid_t));
+		in_f->ilf_blkno = in_f32->ilf_blkno;
+		in_f->ilf_len = in_f32->ilf_len;
+		in_f->ilf_boffset = in_f32->ilf_boffset;
+		return 0;
+	} else if (buf->i_len == sizeof(xfs_inode_log_format_64_t)){
+		xfs_inode_log_format_64_t *in_f64;
+
+		in_f64 = (xfs_inode_log_format_64_t *)buf->i_addr;
+		in_f->ilf_type = in_f64->ilf_type;
+		in_f->ilf_size = in_f64->ilf_size;
+		in_f->ilf_fields = in_f64->ilf_fields;
+		in_f->ilf_asize = in_f64->ilf_asize;
+		in_f->ilf_dsize = in_f64->ilf_dsize;
+		in_f->ilf_ino = in_f64->ilf_ino;
+		/* copy biggest field of ilf_u */
+		memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
+		       in_f64->ilf_u.ilfu_uuid.__u_bits,
+		       sizeof(uuid_t));
+		in_f->ilf_blkno = in_f64->ilf_blkno;
+		in_f->ilf_len = in_f64->ilf_len;
+		in_f->ilf_boffset = in_f64->ilf_boffset;
+		return 0;
+	}
+	return EFSCORRUPTED;
+}