xfs: add CRCs to attr leaf blocks

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Ben Myers <bpm@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

fs/xfs/xfs_attr_leaf.h

 /*
  * Copyright (c) 2000,2002-2003,2005 Silicon Graphics, Inc.
+ * Copyright (c) 2013 Red Hat, Inc.
  * All Rights Reserved.
  *
  * This program is free software; you can redistribute it and/or
@@ -89,7 +90,7 @@ typedef struct xfs_attr_leaf_hdr {	/* constant-structure header block */
 
 typedef struct xfs_attr_leaf_entry {	/* sorted on key, not name */
 	__be32	hashval;		/* hash value of name */
- 	__be16	nameidx;		/* index into buffer of name/value */
+	__be16	nameidx;		/* index into buffer of name/value */
 	__u8	flags;			/* LOCAL/ROOT/SECURE/INCOMPLETE flag */
 	__u8	pad2;			/* unused pad byte */
 } xfs_attr_leaf_entry_t;
@@ -114,6 +115,54 @@ typedef struct xfs_attr_leafblock {
 	xfs_attr_leaf_name_remote_t valuelist;	/* grows from bottom of buf */
 } xfs_attr_leafblock_t;
 
+/*
+ * CRC enabled leaf structures. Called "version 3" structures to match the
+ * version number of the directory and dablk structures for this feature, and
+ * attr2 is already taken by the variable inode attribute fork size feature.
+ */
+struct xfs_attr3_leaf_hdr {
+	struct xfs_da3_blkinfo	info;
+	__be16			count;
+	__be16			usedbytes;
+	__be16			firstused;
+	__u8			holes;
+	__u8			pad1;
+	struct xfs_attr_leaf_map freemap[XFS_ATTR_LEAF_MAPSIZE];
+};
+
+#define XFS_ATTR3_LEAF_CRC_OFF	(offsetof(struct xfs_attr3_leaf_hdr, info.crc))
+
+struct xfs_attr3_leafblock {
+	struct xfs_attr3_leaf_hdr	hdr;
+	struct xfs_attr_leaf_entry	entries[1];
+
+	/*
+	 * The rest of the block contains the following structures after the
+	 * leaf entries, growing from the bottom up. The variables are never
+	 * referenced, the locations accessed purely from helper functions.
+	 *
+	 * struct xfs_attr_leaf_name_local
+	 * struct xfs_attr_leaf_name_remote
+	 */
+};
+
+/*
+ * incore, neutral version of the attribute leaf header
+ */
+struct xfs_attr3_icleaf_hdr {
+	__uint32_t	forw;
+	__uint32_t	back;
+	__uint16_t	magic;
+	__uint16_t	count;
+	__uint16_t	usedbytes;
+	__uint16_t	firstused;
+	__u8		holes;
+	struct {
+		__uint16_t	base;
+		__uint16_t	size;
+	} freemap[XFS_ATTR_LEAF_MAPSIZE];
+};
+
 /*
  * Flags used in the leaf_entry[i].flags field.
  * NOTE: the INCOMPLETE bit must not collide with the flags bits specified
@@ -147,26 +196,43 @@ typedef struct xfs_attr_leafblock {
  */
 #define	XFS_ATTR_LEAF_NAME_ALIGN	((uint)sizeof(xfs_dablk_t))
 
+static inline int
+xfs_attr3_leaf_hdr_size(struct xfs_attr_leafblock *leafp)
+{
+	if (leafp->hdr.info.magic == cpu_to_be16(XFS_ATTR3_LEAF_MAGIC))
+		return sizeof(struct xfs_attr3_leaf_hdr);
+	return sizeof(struct xfs_attr_leaf_hdr);
+}
+
+static inline struct xfs_attr_leaf_entry *
+xfs_attr3_leaf_entryp(xfs_attr_leafblock_t *leafp)
+{
+	if (leafp->hdr.info.magic == cpu_to_be16(XFS_ATTR3_LEAF_MAGIC))
+		return &((struct xfs_attr3_leafblock *)leafp)->entries[0];
+	return &leafp->entries[0];
+}
+
 /*
  * Cast typed pointers for "local" and "remote" name/value structs.
  */
-static inline xfs_attr_leaf_name_remote_t *
-xfs_attr_leaf_name_remote(xfs_attr_leafblock_t *leafp, int idx)
+static inline char *
+xfs_attr3_leaf_name(xfs_attr_leafblock_t *leafp, int idx)
 {
-	return (xfs_attr_leaf_name_remote_t *)
-		&((char *)leafp)[be16_to_cpu(leafp->entries[idx].nameidx)];
+	struct xfs_attr_leaf_entry *entries = xfs_attr3_leaf_entryp(leafp);
+
+	return &((char *)leafp)[be16_to_cpu(entries[idx].nameidx)];
 }
 
-static inline xfs_attr_leaf_name_local_t *
-xfs_attr_leaf_name_local(xfs_attr_leafblock_t *leafp, int idx)
+static inline xfs_attr_leaf_name_remote_t *
+xfs_attr3_leaf_name_remote(xfs_attr_leafblock_t *leafp, int idx)
 {
-	return (xfs_attr_leaf_name_local_t *)
-		&((char *)leafp)[be16_to_cpu(leafp->entries[idx].nameidx)];
+	return (xfs_attr_leaf_name_remote_t *)xfs_attr3_leaf_name(leafp, idx);
 }
 
-static inline char *xfs_attr_leaf_name(xfs_attr_leafblock_t *leafp, int idx)
+static inline xfs_attr_leaf_name_local_t *
+xfs_attr3_leaf_name_local(xfs_attr_leafblock_t *leafp, int idx)
 {
-	return &((char *)leafp)[be16_to_cpu(leafp->entries[idx].nameidx)];
+	return (xfs_attr_leaf_name_local_t *)xfs_attr3_leaf_name(leafp, idx);
 }
 
 /*
@@ -221,37 +287,37 @@ int	xfs_attr_shortform_bytesfit(xfs_inode_t *dp, int bytes);
 /*
  * Internal routines when attribute fork size == XFS_LBSIZE(mp).
  */
-int	xfs_attr_leaf_to_node(struct xfs_da_args *args);
-int	xfs_attr_leaf_to_shortform(struct xfs_buf *bp,
+int	xfs_attr3_leaf_to_node(struct xfs_da_args *args);
+int	xfs_attr3_leaf_to_shortform(struct xfs_buf *bp,
 				   struct xfs_da_args *args, int forkoff);
-int	xfs_attr_leaf_clearflag(struct xfs_da_args *args);
-int	xfs_attr_leaf_setflag(struct xfs_da_args *args);
-int	xfs_attr_leaf_flipflags(xfs_da_args_t *args);
+int	xfs_attr3_leaf_clearflag(struct xfs_da_args *args);
+int	xfs_attr3_leaf_setflag(struct xfs_da_args *args);
+int	xfs_attr3_leaf_flipflags(struct xfs_da_args *args);
 
 /*
  * Routines used for growing the Btree.
  */
-int	xfs_attr_leaf_split(struct xfs_da_state *state,
+int	xfs_attr3_leaf_split(struct xfs_da_state *state,
 				   struct xfs_da_state_blk *oldblk,
 				   struct xfs_da_state_blk *newblk);
-int	xfs_attr_leaf_lookup_int(struct xfs_buf *leaf,
+int	xfs_attr3_leaf_lookup_int(struct xfs_buf *leaf,
 					struct xfs_da_args *args);
-int	xfs_attr_leaf_getvalue(struct xfs_buf *bp, struct xfs_da_args *args);
-int	xfs_attr_leaf_add(struct xfs_buf *leaf_buffer,
+int	xfs_attr3_leaf_getvalue(struct xfs_buf *bp, struct xfs_da_args *args);
+int	xfs_attr3_leaf_add(struct xfs_buf *leaf_buffer,
 				 struct xfs_da_args *args);
-int	xfs_attr_leaf_remove(struct xfs_buf *leaf_buffer,
+int	xfs_attr3_leaf_remove(struct xfs_buf *leaf_buffer,
 				    struct xfs_da_args *args);
-int	xfs_attr_leaf_list_int(struct xfs_buf *bp,
+int	xfs_attr3_leaf_list_int(struct xfs_buf *bp,
 				      struct xfs_attr_list_context *context);
 
 /*
  * Routines used for shrinking the Btree.
  */
-int	xfs_attr_leaf_toosmall(struct xfs_da_state *state, int *retval);
-void	xfs_attr_leaf_unbalance(struct xfs_da_state *state,
+int	xfs_attr3_leaf_toosmall(struct xfs_da_state *state, int *retval);
+void	xfs_attr3_leaf_unbalance(struct xfs_da_state *state,
 				       struct xfs_da_state_blk *drop_blk,
 				       struct xfs_da_state_blk *save_blk);
-int	xfs_attr_root_inactive(struct xfs_trans **trans, struct xfs_inode *dp);
+int	xfs_attr3_root_inactive(struct xfs_trans **trans, struct xfs_inode *dp);
 
 /*
  * Utility routines.
@@ -261,10 +327,12 @@ int	xfs_attr_leaf_order(struct xfs_buf *leaf1_bp,
 				   struct xfs_buf *leaf2_bp);
 int	xfs_attr_leaf_newentsize(int namelen, int valuelen, int blocksize,
 					int *local);
-int	xfs_attr_leaf_read(struct xfs_trans *tp, struct xfs_inode *dp,
+int	xfs_attr3_leaf_read(struct xfs_trans *tp, struct xfs_inode *dp,
 			xfs_dablk_t bno, xfs_daddr_t mappedbno,
 			struct xfs_buf **bpp);
+void	xfs_attr3_leaf_hdr_from_disk(struct xfs_attr3_icleaf_hdr *to,
+				     struct xfs_attr_leafblock *from);
 
-extern const struct xfs_buf_ops xfs_attr_leaf_buf_ops;
+extern const struct xfs_buf_ops xfs_attr3_leaf_buf_ops;
 
 #endif	/* __XFS_ATTR_LEAF_H__ */

fs/xfs/xfs_da_btree.c

@@ -143,14 +143,14 @@ xfs_da3_node_hdr_from_disk(
 		to->forw = be32_to_cpu(hdr3->info.hdr.forw);
 		to->back = be32_to_cpu(hdr3->info.hdr.back);
 		to->magic = be16_to_cpu(hdr3->info.hdr.magic);
-		to->count = be16_to_cpu(hdr3->count);
+		to->count = be16_to_cpu(hdr3->__count);
 		to->level = be16_to_cpu(hdr3->__level);
 		return;
 	}
 	to->forw = be32_to_cpu(from->hdr.info.forw);
 	to->back = be32_to_cpu(from->hdr.info.back);
 	to->magic = be16_to_cpu(from->hdr.info.magic);
-	to->count = be16_to_cpu(from->hdr.count);
+	to->count = be16_to_cpu(from->hdr.__count);
 	to->level = be16_to_cpu(from->hdr.__level);
 }
 
@@ -168,14 +168,14 @@ xfs_da3_node_hdr_to_disk(
 		hdr3->info.hdr.forw = cpu_to_be32(from->forw);
 		hdr3->info.hdr.back = cpu_to_be32(from->back);
 		hdr3->info.hdr.magic = cpu_to_be16(from->magic);
-		hdr3->count = cpu_to_be16(from->count);
+		hdr3->__count = cpu_to_be16(from->count);
 		hdr3->__level = cpu_to_be16(from->level);
 		return;
 	}
 	to->hdr.info.forw = cpu_to_be32(from->forw);
 	to->hdr.info.back = cpu_to_be32(from->back);
 	to->hdr.info.magic = cpu_to_be16(from->magic);
-	to->hdr.count = cpu_to_be16(from->count);
+	to->hdr.__count = cpu_to_be16(from->count);
 	to->hdr.__level = cpu_to_be16(from->level);
 }
 
@@ -270,7 +270,7 @@ xfs_da3_node_read_verify(
 				break;
 			return;
 		case XFS_ATTR_LEAF_MAGIC:
-			bp->b_ops = &xfs_attr_leaf_buf_ops;
+			bp->b_ops = &xfs_attr3_leaf_buf_ops;
 			bp->b_ops->verify_read(bp);
 			return;
 		case XFS_DIR2_LEAFN_MAGIC:
@@ -401,7 +401,7 @@ xfs_da3_split(
 		 */
 		switch (oldblk->magic) {
 		case XFS_ATTR_LEAF_MAGIC:
-			error = xfs_attr_leaf_split(state, oldblk, newblk);
+			error = xfs_attr3_leaf_split(state, oldblk, newblk);
 			if ((error != 0) && (error != ENOSPC)) {
 				return(error);	/* GROT: attr is inconsistent */
 			}
@@ -416,12 +416,12 @@ xfs_da3_split(
 			if (state->inleaf) {
 				state->extraafter = 0;	/* before newblk */
 				trace_xfs_attr_leaf_split_before(state->args);
-				error = xfs_attr_leaf_split(state, oldblk,
+				error = xfs_attr3_leaf_split(state, oldblk,
 							    &state->extrablk);
 			} else {
 				state->extraafter = 1;	/* after newblk */
 				trace_xfs_attr_leaf_split_after(state->args);
-				error = xfs_attr_leaf_split(state, newblk,
+				error = xfs_attr3_leaf_split(state, newblk,
 							    &state->extrablk);
 			}
 			if (error)
@@ -963,12 +963,12 @@ xfs_da3_join(
 		 */
 		switch (drop_blk->magic) {
 		case XFS_ATTR_LEAF_MAGIC:
-			error = xfs_attr_leaf_toosmall(state, &action);
+			error = xfs_attr3_leaf_toosmall(state, &action);
 			if (error)
 				return(error);
 			if (action == 0)
 				return(0);
-			xfs_attr_leaf_unbalance(state, drop_blk, save_blk);
+			xfs_attr3_leaf_unbalance(state, drop_blk, save_blk);
 			break;
 		case XFS_DIR2_LEAFN_MAGIC:
 			error = xfs_dir2_leafn_toosmall(state, &action);
@@ -1024,7 +1024,8 @@ xfs_da_blkinfo_onlychild_validate(struct xfs_da_blkinfo *blkinfo, __u16 level)
 	if (level == 1) {
 		ASSERT(magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) ||
 		       magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC) ||
-		       magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC));
+		       magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC) ||
+		       magic == cpu_to_be16(XFS_ATTR3_LEAF_MAGIC));
 	} else {
 		ASSERT(magic == cpu_to_be16(XFS_DA_NODE_MAGIC) ||
 		       magic == cpu_to_be16(XFS_DA3_NODE_MAGIC));
@@ -1482,7 +1483,9 @@ xfs_da3_node_lookup_int(
 		curr = blk->bp->b_addr;
 		blk->magic = be16_to_cpu(curr->magic);
 
-		if (blk->magic == XFS_ATTR_LEAF_MAGIC) {
+		if (blk->magic == XFS_ATTR_LEAF_MAGIC ||
+		    blk->magic == XFS_ATTR3_LEAF_MAGIC) {
+			blk->magic = XFS_ATTR_LEAF_MAGIC;
 			blk->hashval = xfs_attr_leaf_lasthash(blk->bp, NULL);
 			break;
 		}
@@ -1562,7 +1565,7 @@ xfs_da3_node_lookup_int(
 			retval = xfs_dir2_leafn_lookup_int(blk->bp, args,
 							&blk->index, state);
 		} else if (blk->magic == XFS_ATTR_LEAF_MAGIC) {
-			retval = xfs_attr_leaf_lookup_int(blk->bp, args);
+			retval = xfs_attr3_leaf_lookup_int(blk->bp, args);
 			blk->index = args->index;
 			args->blkno = blk->blkno;
 		} else {
@@ -1874,7 +1877,8 @@ xfs_da3_path_shift(
 		       info->magic == cpu_to_be16(XFS_DA3_NODE_MAGIC) ||
 		       info->magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) ||
 		       info->magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC) ||
-		       info->magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC));
+		       info->magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC) ||
+		       info->magic == cpu_to_be16(XFS_ATTR3_LEAF_MAGIC));
 
 
 		/*
@@ -1896,6 +1900,7 @@ xfs_da3_path_shift(
 			blkno = be32_to_cpu(btree[blk->index].before);
 			break;
 		case XFS_ATTR_LEAF_MAGIC:
+		case XFS_ATTR3_LEAF_MAGIC:
 			blk->magic = XFS_ATTR_LEAF_MAGIC;
 			ASSERT(level == path->active-1);
 			blk->index = 0;
@@ -2626,6 +2631,7 @@ xfs_da_read_buf(
 		    XFS_TEST_ERROR((magic != XFS_DA_NODE_MAGIC) &&
 				   (magic != XFS_DA3_NODE_MAGIC) &&
 				   (magic != XFS_ATTR_LEAF_MAGIC) &&
+				   (magic != XFS_ATTR3_LEAF_MAGIC) &&
 				   (magic != XFS_DIR2_LEAF1_MAGIC) &&
 				   (magic != XFS_DIR3_LEAF1_MAGIC) &&
 				   (magic != XFS_DIR2_LEAFN_MAGIC) &&

fs/xfs/xfs_da_btree.h

@@ -55,6 +55,7 @@ typedef struct xfs_da_blkinfo {
  * magic numbers without modification for both v2 and v3 nodes.
  */
 #define XFS_DA3_NODE_MAGIC	0x3ebe	/* magic number: non-leaf blocks */
+#define XFS_ATTR3_LEAF_MAGIC	0x3bee	/* magic number: attribute leaf blks */
 #define	XFS_DIR3_LEAF1_MAGIC	0x3df1	/* magic number: v2 dirlf single blks */
 #define	XFS_DIR3_LEAFN_MAGIC	0x3dff	/* magic number: v2 dirlf multi blks */
 
@@ -85,13 +86,13 @@ struct xfs_da3_blkinfo {
 
 typedef struct xfs_da_node_hdr {
 	struct xfs_da_blkinfo	info;	/* block type, links, etc. */
-	__be16			count; /* count of active entries */
+	__be16			__count; /* count of active entries */
 	__be16			__level; /* level above leaves (leaf == 0) */
 } xfs_da_node_hdr_t;
 
 struct xfs_da3_node_hdr {
 	struct xfs_da3_blkinfo	info;	/* block type, links, etc. */
-	__be16			count; /* count of active entries */
+	__be16			__count; /* count of active entries */
 	__be16			__level; /* level above leaves (leaf == 0) */
 	__be32			__pad32;
 };