xfs: introduce xlog_copy_iovec

Add a helper to abstract out filling the log iovecs in the log item
format handlers.  This will allow us to change the way we do the log
item formatting more easily.

The copy in the name is a bit confusing for now as it just assigns a
pointer and lets the CIL code perform the copy, but that will change
soon.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

1 files changed, 52 insertions, 63 deletions

diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c
index 2ad12dc..c75e14b 100644
--- a/fs/xfs/xfs_inode_item.c
+++ b/fs/xfs/xfs_inode_item.c
@@ -30,6 +30,7 @@
 #include "xfs_trace.h"
 #include "xfs_trans_priv.h"
 #include "xfs_dinode.h"
+#include "xfs_log.h"
 
 
 kmem_zone_t	*xfs_ili_zone;		/* inode log item zone */
@@ -159,14 +160,15 @@ xfs_inode_item_size(
  * here, so always use the physical fork size to determine the size of the
  * buffer we need to allocate.
  */
-STATIC void
+STATIC int
 xfs_inode_item_format_extents(
 	struct xfs_inode	*ip,
-	struct xfs_log_iovec	*vecp,
+	struct xfs_log_iovec	**vecp,
 	int			whichfork,
 	int			type)
 {
 	xfs_bmbt_rec_t		*ext_buffer;
+	int			len;
 
 	ext_buffer = kmem_alloc(XFS_IFORK_SIZE(ip, whichfork), KM_SLEEP);
 	if (whichfork == XFS_DATA_FORK)
@@ -174,9 +176,9 @@ xfs_inode_item_format_extents(
 	else
 		ip->i_itemp->ili_aextents_buf = ext_buffer;
 
-	vecp->i_addr = ext_buffer;
-	vecp->i_len = xfs_iextents_copy(ip, ext_buffer, whichfork);
-	vecp->i_type = type;
+	len = xfs_iextents_copy(ip, ext_buffer, whichfork);
+	xlog_copy_iovec(vecp, type, ext_buffer, len);
+	return len;
 }
 
 /*
@@ -207,10 +209,10 @@ xfs_inode_item_format_v1_inode(
 	}
 }
 
-STATIC struct xfs_log_iovec *
+STATIC void
 xfs_inode_item_format_data_fork(
 	struct xfs_inode_log_item *iip,
-	struct xfs_log_iovec	*vecp,
+	struct xfs_log_iovec	**vecp,
 	int			*nvecs)
 {
 	struct xfs_inode	*ip = iip->ili_inode;
@@ -237,18 +239,18 @@ xfs_inode_item_format_data_fork(
 				 * extents, so just point to the
 				 * real extents array.
 				 */
-				vecp->i_addr = ip->i_df.if_u1.if_extents;
-				vecp->i_len = ip->i_df.if_bytes;
-				vecp->i_type = XLOG_REG_TYPE_IEXT;
+				xlog_copy_iovec(vecp, XLOG_REG_TYPE_IEXT,
+						ip->i_df.if_u1.if_extents,
+						ip->i_df.if_bytes);
+				iip->ili_format.ilf_dsize = ip->i_df.if_bytes;
 			} else
 #endif
 			{
-				xfs_inode_item_format_extents(ip, vecp,
-					XFS_DATA_FORK, XLOG_REG_TYPE_IEXT);
+				iip->ili_format.ilf_dsize =
+					xfs_inode_item_format_extents(ip, vecp,
+						XFS_DATA_FORK, XLOG_REG_TYPE_IEXT);
+				ASSERT(iip->ili_format.ilf_dsize <= ip->i_df.if_bytes);
 			}
-			ASSERT(vecp->i_len <= ip->i_df.if_bytes);
-			iip->ili_format.ilf_dsize = vecp->i_len;
-			vecp++;
 			(*nvecs)++;
 		} else {
 			iip->ili_fields &= ~XFS_ILOG_DEXT;
@@ -262,10 +264,9 @@ xfs_inode_item_format_data_fork(
 		if ((iip->ili_fields & XFS_ILOG_DBROOT) &&
 		    ip->i_df.if_broot_bytes > 0) {
 			ASSERT(ip->i_df.if_broot != NULL);
-			vecp->i_addr = ip->i_df.if_broot;
-			vecp->i_len = ip->i_df.if_broot_bytes;
-			vecp->i_type = XLOG_REG_TYPE_IBROOT;
-			vecp++;
+			xlog_copy_iovec(vecp, XLOG_REG_TYPE_IBROOT,
+					ip->i_df.if_broot,
+					ip->i_df.if_broot_bytes);
 			(*nvecs)++;
 			iip->ili_format.ilf_dsize = ip->i_df.if_broot_bytes;
 		} else {
@@ -280,21 +281,18 @@ xfs_inode_item_format_data_fork(
 			  XFS_ILOG_DEV | XFS_ILOG_UUID);
 		if ((iip->ili_fields & XFS_ILOG_DDATA) &&
 		    ip->i_df.if_bytes > 0) {
-			ASSERT(ip->i_df.if_u1.if_data != NULL);
-			ASSERT(ip->i_d.di_size > 0);
-
-			vecp->i_addr = ip->i_df.if_u1.if_data;
 			/*
 			 * Round i_bytes up to a word boundary.
 			 * The underlying memory is guaranteed to
 			 * to be there by xfs_idata_realloc().
 			 */
 			data_bytes = roundup(ip->i_df.if_bytes, 4);
-			ASSERT((ip->i_df.if_real_bytes == 0) ||
-			       (ip->i_df.if_real_bytes == data_bytes));
-			vecp->i_len = (int)data_bytes;
-			vecp->i_type = XLOG_REG_TYPE_ILOCAL;
-			vecp++;
+			ASSERT(ip->i_df.if_real_bytes == 0 ||
+			       ip->i_df.if_real_bytes == data_bytes);
+			ASSERT(ip->i_df.if_u1.if_data != NULL);
+			ASSERT(ip->i_d.di_size > 0);
+			xlog_copy_iovec(vecp, XLOG_REG_TYPE_ILOCAL,
+					ip->i_df.if_u1.if_data, data_bytes);
 			(*nvecs)++;
 			iip->ili_format.ilf_dsize = (unsigned)data_bytes;
 		} else {
@@ -323,14 +321,12 @@ xfs_inode_item_format_data_fork(
 		ASSERT(0);
 		break;
 	}
-
-	return vecp;
 }
 
-STATIC struct xfs_log_iovec *
+STATIC void
 xfs_inode_item_format_attr_fork(
 	struct xfs_inode_log_item *iip,
-	struct xfs_log_iovec	*vecp,
+	struct xfs_log_iovec	**vecp,
 	int			*nvecs)
 {
 	struct xfs_inode	*ip = iip->ili_inode;
@@ -352,16 +348,16 @@ xfs_inode_item_format_attr_fork(
 			 * There are not delayed allocation extents
 			 * for attributes, so just point at the array.
 			 */
-			vecp->i_addr = ip->i_afp->if_u1.if_extents;
-			vecp->i_len = ip->i_afp->if_bytes;
-			vecp->i_type = XLOG_REG_TYPE_IATTR_EXT;
+			xlog_copy_iovec(vecp, XLOG_REG_TYPE_IATTR_EXT,
+					ip->i_afp->if_u1.if_extents,
+					ip->i_afp->if_bytes);
+			iip->ili_format.ilf_asize = ip->i_afp->if_bytes;
 #else
 			ASSERT(iip->ili_aextents_buf == NULL);
-			xfs_inode_item_format_extents(ip, vecp,
+			iip->ili_format.ilf_asize =
+				xfs_inode_item_format_extents(ip, vecp,
 					XFS_ATTR_FORK, XLOG_REG_TYPE_IATTR_EXT);
 #endif
-			iip->ili_format.ilf_asize = vecp->i_len;
-			vecp++;
 			(*nvecs)++;
 		} else {
 			iip->ili_fields &= ~XFS_ILOG_AEXT;
@@ -375,10 +371,9 @@ xfs_inode_item_format_attr_fork(
 		    ip->i_afp->if_broot_bytes > 0) {
 			ASSERT(ip->i_afp->if_broot != NULL);
 
-			vecp->i_addr = ip->i_afp->if_broot;
-			vecp->i_len = ip->i_afp->if_broot_bytes;
-			vecp->i_type = XLOG_REG_TYPE_IATTR_BROOT;
-			vecp++;
+			xlog_copy_iovec(vecp, XLOG_REG_TYPE_IATTR_BROOT,
+					ip->i_afp->if_broot,
+					ip->i_afp->if_broot_bytes);
 			(*nvecs)++;
 			iip->ili_format.ilf_asize = ip->i_afp->if_broot_bytes;
 		} else {
@@ -391,20 +386,18 @@ xfs_inode_item_format_attr_fork(
 
 		if ((iip->ili_fields & XFS_ILOG_ADATA) &&
 		    ip->i_afp->if_bytes > 0) {
-			ASSERT(ip->i_afp->if_u1.if_data != NULL);
-
-			vecp->i_addr = ip->i_afp->if_u1.if_data;
 			/*
 			 * Round i_bytes up to a word boundary.
 			 * The underlying memory is guaranteed to
 			 * to be there by xfs_idata_realloc().
 			 */
 			data_bytes = roundup(ip->i_afp->if_bytes, 4);
-			ASSERT((ip->i_afp->if_real_bytes == 0) ||
-			       (ip->i_afp->if_real_bytes == data_bytes));
-			vecp->i_len = (int)data_bytes;
-			vecp->i_type = XLOG_REG_TYPE_IATTR_LOCAL;
-			vecp++;
+			ASSERT(ip->i_afp->if_real_bytes == 0 ||
+			       ip->i_afp->if_real_bytes == data_bytes);
+			ASSERT(ip->i_afp->if_u1.if_data != NULL);
+			xlog_copy_iovec(vecp, XLOG_REG_TYPE_IATTR_LOCAL,
+					ip->i_afp->if_u1.if_data,
+					data_bytes);
 			(*nvecs)++;
 			iip->ili_format.ilf_asize = (unsigned)data_bytes;
 		} else {
@@ -415,8 +408,6 @@ xfs_inode_item_format_attr_fork(
 		ASSERT(0);
 		break;
 	}
-
-	return vecp;
 }
 
 /*
@@ -435,24 +426,22 @@ xfs_inode_item_format(
 	struct xfs_inode	*ip = iip->ili_inode;
 	uint			nvecs;
 
-	vecp->i_addr = &iip->ili_format;
-	vecp->i_len  = sizeof(xfs_inode_log_format_t);
-	vecp->i_type = XLOG_REG_TYPE_IFORMAT;
-	vecp++;
-	nvecs	     = 1;
+	xlog_copy_iovec(&vecp, XLOG_REG_TYPE_IFORMAT,
+			&iip->ili_format,
+			sizeof(struct xfs_inode_log_format));
+	nvecs = 1;
 
-	vecp->i_addr = &ip->i_d;
-	vecp->i_len  = xfs_icdinode_size(ip->i_d.di_version);
-	vecp->i_type = XLOG_REG_TYPE_ICORE;
-	vecp++;
+	xlog_copy_iovec(&vecp, XLOG_REG_TYPE_ICORE,
+			&ip->i_d,
+			xfs_icdinode_size(ip->i_d.di_version));
 	nvecs++;
 
 	if (ip->i_d.di_version == 1)
 		xfs_inode_item_format_v1_inode(ip);
 
-	vecp = xfs_inode_item_format_data_fork(iip, vecp, &nvecs);
+	xfs_inode_item_format_data_fork(iip, &vecp, &nvecs);
 	if (XFS_IFORK_Q(ip)) {
-		vecp = xfs_inode_item_format_attr_fork(iip, vecp, &nvecs);
+		xfs_inode_item_format_attr_fork(iip, &vecp, &nvecs);
 	} else {
 		iip->ili_fields &=
 			~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT);