xfs: add buffer types to directory and attribute buffers

Add buffer types to the buffer log items so that log recovery can
validate the buffers and calculate CRCs correctly after the buffers
are recovered.

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

1 files changed, 180 insertions, 74 deletions

diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index d1292fd1112a..00727bc4a9b0 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -45,7 +45,14 @@
 #include "xfs_cksum.h"
 #include "xfs_trace.h"
 #include "xfs_icache.h"
+
+/* Need all the magic numbers and buffer ops structures from these headers */
 #include "xfs_symlink.h"
+#include "xfs_da_btree.h"
+#include "xfs_dir2_format.h"
+#include "xfs_dir2_priv.h"
+#include "xfs_attr_leaf.h"
+#include "xfs_attr_remote.h"
 
 STATIC int
 xlog_find_zeroed(
@@ -1860,81 +1867,30 @@ xlog_recover_do_inode_buffer(
 }
 
 /*
- * Perform a 'normal' buffer recovery.  Each logged region of the
- * buffer should be copied over the corresponding region in the
- * given buffer.  The bitmap in the buf log format structure indicates
- * where to place the logged data.
+ * Validate the recovered buffer is of the correct type and attach the
+ * appropriate buffer operations to them for writeback. Magic numbers are in a
+ * few places:
+ *	the first 16 bits of the buffer (inode buffer, dquot buffer),
+ *	the first 32 bits of the buffer (most blocks),
+ *	inside a struct xfs_da_blkinfo at the start of the buffer.
  */
-STATIC void
-xlog_recover_do_reg_buffer(
+static void
+xlog_recovery_validate_buf_type(
 	struct xfs_mount	*mp,
-	xlog_recover_item_t	*item,
 	struct xfs_buf		*bp,
 	xfs_buf_log_format_t	*buf_f)
 {
-	int			i;
-	int			bit;
-	int			nbits;
-	int                     error;
-
-	trace_xfs_log_recover_buf_reg_buf(mp->m_log, buf_f);
-
-	bit = 0;
-	i = 1;  /* 0 is the buf format structure */
-	while (1) {
-		bit = xfs_next_bit(buf_f->blf_data_map,
-				   buf_f->blf_map_size, bit);
-		if (bit == -1)
-			break;
-		nbits = xfs_contig_bits(buf_f->blf_data_map,
-					buf_f->blf_map_size, bit);
-		ASSERT(nbits > 0);
-		ASSERT(item->ri_buf[i].i_addr != NULL);
-		ASSERT(item->ri_buf[i].i_len % XFS_BLF_CHUNK == 0);
-		ASSERT(BBTOB(bp->b_io_length) >=
-		       ((uint)bit << XFS_BLF_SHIFT) + (nbits << XFS_BLF_SHIFT));
-
-		/*
-		 * Do a sanity check if this is a dquot buffer. Just checking
-		 * the first dquot in the buffer should do. XXXThis is
-		 * probably a good thing to do for other buf types also.
-		 */
-		error = 0;
-		if (buf_f->blf_flags &
-		   (XFS_BLF_UDQUOT_BUF|XFS_BLF_PDQUOT_BUF|XFS_BLF_GDQUOT_BUF)) {
-			if (item->ri_buf[i].i_addr == NULL) {
-				xfs_alert(mp,
-					"XFS: NULL dquot in %s.", __func__);
-				goto next;
-			}
-			if (item->ri_buf[i].i_len < sizeof(xfs_disk_dquot_t)) {
-				xfs_alert(mp,
-					"XFS: dquot too small (%d) in %s.",
-					item->ri_buf[i].i_len, __func__);
-				goto next;
-			}
-			error = xfs_qm_dqcheck(mp, item->ri_buf[i].i_addr,
-					       -1, 0, XFS_QMOPT_DOWARN,
-					       "dquot_buf_recover");
-			if (error)
-				goto next;
-		}
-
-		memcpy(xfs_buf_offset(bp,
-			(uint)bit << XFS_BLF_SHIFT),	/* dest */
-			item->ri_buf[i].i_addr,		/* source */
-			nbits<<XFS_BLF_SHIFT);		/* length */
- next:
-		i++;
-		bit += nbits;
-	}
-
-	/* Shouldn't be any more regions */
-	ASSERT(i == item->ri_total);
-
+	struct xfs_da_blkinfo	*info = bp->b_addr;
+	__uint32_t		magic32;
+	__uint16_t		magic16;
+	__uint16_t		magicda;
+
+	magic32 = be32_to_cpu(*(__be32 *)bp->b_addr);
+	magic16 = be16_to_cpu(*(__be16*)bp->b_addr);
+	magicda = be16_to_cpu(info->magic);
 	switch (buf_f->blf_flags & XFS_BLF_TYPE_MASK) {
 	case XFS_BLF_BTREE_BUF:
-		switch (be32_to_cpu(*(__be32 *)bp->b_addr)) {
+		switch (magic32) {
 		case XFS_ABTB_CRC_MAGIC:
 		case XFS_ABTC_CRC_MAGIC:
 		case XFS_ABTB_MAGIC:
@@ -1956,7 +1912,7 @@ xlog_recover_do_reg_buffer(
 		}
 		break;
 	case XFS_BLF_AGF_BUF:
-		if (*(__be32 *)bp->b_addr != cpu_to_be32(XFS_AGF_MAGIC)) {
+		if (magic32 != XFS_AGF_MAGIC) {
 			xfs_warn(mp, "Bad AGF block magic!");
 			ASSERT(0);
 			break;
@@ -1966,7 +1922,7 @@ xlog_recover_do_reg_buffer(
 	case XFS_BLF_AGFL_BUF:
 		if (!xfs_sb_version_hascrc(&mp->m_sb))
 			break;
-		if (*(__be32 *)bp->b_addr != cpu_to_be32(XFS_AGFL_MAGIC)) {
+		if (magic32 != XFS_AGFL_MAGIC) {
 			xfs_warn(mp, "Bad AGFL block magic!");
 			ASSERT(0);
 			break;
@@ -1974,7 +1930,7 @@ xlog_recover_do_reg_buffer(
 		bp->b_ops = &xfs_agfl_buf_ops;
 		break;
 	case XFS_BLF_AGI_BUF:
-		if (*(__be32 *)bp->b_addr != cpu_to_be32(XFS_AGI_MAGIC)) {
+		if (magic32 != XFS_AGI_MAGIC) {
 			xfs_warn(mp, "Bad AGI block magic!");
 			ASSERT(0);
 			break;
@@ -1984,7 +1940,7 @@ xlog_recover_do_reg_buffer(
 	case XFS_BLF_UDQUOT_BUF:
 	case XFS_BLF_PDQUOT_BUF:
 	case XFS_BLF_GDQUOT_BUF:
-		if (*(__be16 *)bp->b_addr != cpu_to_be16(XFS_DQUOT_MAGIC)) {
+		if (magic16 != XFS_DQUOT_MAGIC) {
 			xfs_warn(mp, "Bad DQUOT block magic!");
 			ASSERT(0);
 			break;
@@ -1996,7 +1952,7 @@ xlog_recover_do_reg_buffer(
 		 * we get here with inode allocation buffers, not buffers that
 		 * track unlinked list changes.
 		 */
-		if (*(__be16 *)bp->b_addr != cpu_to_be16(XFS_DINODE_MAGIC)) {
+		if (magic16 != XFS_DINODE_MAGIC) {
 			xfs_warn(mp, "Bad INODE block magic!");
 			ASSERT(0);
 			break;
@@ -2004,19 +1960,169 @@ xlog_recover_do_reg_buffer(
 		bp->b_ops = &xfs_inode_buf_ops;
 		break;
 	case XFS_BLF_SYMLINK_BUF:
-		if (*(__be32 *)bp->b_addr != cpu_to_be32(XFS_SYMLINK_MAGIC)) {
+		if (magic32 != XFS_SYMLINK_MAGIC) {
 			xfs_warn(mp, "Bad symlink block magic!");
 			ASSERT(0);
 			break;
 		}
 		bp->b_ops = &xfs_symlink_buf_ops;
 		break;
+	case XFS_BLF_DIR_BLOCK_BUF:
+		if (magic32 != XFS_DIR2_BLOCK_MAGIC &&
+		    magic32 != XFS_DIR3_BLOCK_MAGIC) {
+			xfs_warn(mp, "Bad dir block magic!");
+			ASSERT(0);
+			break;
+		}
+		bp->b_ops = &xfs_dir3_block_buf_ops;
+		break;
+	case XFS_BLF_DIR_DATA_BUF:
+		if (magic32 != XFS_DIR2_DATA_MAGIC &&
+		    magic32 != XFS_DIR3_DATA_MAGIC) {
+			xfs_warn(mp, "Bad dir data magic!");
+			ASSERT(0);
+			break;
+		}
+		bp->b_ops = &xfs_dir3_data_buf_ops;
+		break;
+	case XFS_BLF_DIR_FREE_BUF:
+		if (magic32 != XFS_DIR2_FREE_MAGIC &&
+		    magic32 != XFS_DIR3_FREE_MAGIC) {
+			xfs_warn(mp, "Bad dir3 free magic!");
+			ASSERT(0);
+			break;
+		}
+		bp->b_ops = &xfs_dir3_free_buf_ops;
+		break;
+	case XFS_BLF_DIR_LEAF1_BUF:
+		if (magicda != XFS_DIR2_LEAF1_MAGIC &&
+		    magicda != XFS_DIR3_LEAF1_MAGIC) {
+			xfs_warn(mp, "Bad dir leaf1 magic!");
+			ASSERT(0);
+			break;
+		}
+		bp->b_ops = &xfs_dir3_leaf1_buf_ops;
+		break;
+	case XFS_BLF_DIR_LEAFN_BUF:
+		if (magicda != XFS_DIR2_LEAFN_MAGIC &&
+		    magicda != XFS_DIR3_LEAFN_MAGIC) {
+			xfs_warn(mp, "Bad dir leafn magic!");
+			ASSERT(0);
+			break;
+		}
+		bp->b_ops = &xfs_dir3_leafn_buf_ops;
+		break;
+	case XFS_BLF_DA_NODE_BUF:
+		if (magicda != XFS_DA_NODE_MAGIC &&
+		    magicda != XFS_DA3_NODE_MAGIC) {
+			xfs_warn(mp, "Bad da node magic!");
+			ASSERT(0);
+			break;
+		}
+		bp->b_ops = &xfs_da3_node_buf_ops;
+		break;
+	case XFS_BLF_ATTR_LEAF_BUF:
+		if (magicda != XFS_ATTR_LEAF_MAGIC &&
+		    magicda != XFS_ATTR3_LEAF_MAGIC) {
+			xfs_warn(mp, "Bad attr leaf magic!");
+			ASSERT(0);
+			break;
+		}
+		bp->b_ops = &xfs_attr3_leaf_buf_ops;
+		break;
+	case XFS_BLF_ATTR_RMT_BUF:
+		if (!xfs_sb_version_hascrc(&mp->m_sb))
+			break;
+		if (magicda != XFS_ATTR3_RMT_MAGIC) {
+			xfs_warn(mp, "Bad attr remote magic!");
+			ASSERT(0);
+			break;
+		}
+		bp->b_ops = &xfs_attr3_rmt_buf_ops;
+		break;
 	default:
 		break;
 	}
 }
 
 /*
+ * Perform a 'normal' buffer recovery.  Each logged region of the
+ * buffer should be copied over the corresponding region in the
+ * given buffer.  The bitmap in the buf log format structure indicates
+ * where to place the logged data.
+ */
+STATIC void
+xlog_recover_do_reg_buffer(
+	struct xfs_mount	*mp,
+	xlog_recover_item_t	*item,
+	struct xfs_buf		*bp,
+	xfs_buf_log_format_t	*buf_f)
+{
+	int			i;
+	int			bit;
+	int			nbits;
+	int                     error;
+
+	trace_xfs_log_recover_buf_reg_buf(mp->m_log, buf_f);
+
+	bit = 0;
+	i = 1;  /* 0 is the buf format structure */
+	while (1) {
+		bit = xfs_next_bit(buf_f->blf_data_map,
+				   buf_f->blf_map_size, bit);
+		if (bit == -1)
+			break;
+		nbits = xfs_contig_bits(buf_f->blf_data_map,
+					buf_f->blf_map_size, bit);
+		ASSERT(nbits > 0);
+		ASSERT(item->ri_buf[i].i_addr != NULL);
+		ASSERT(item->ri_buf[i].i_len % XFS_BLF_CHUNK == 0);
+		ASSERT(BBTOB(bp->b_io_length) >=
+		       ((uint)bit << XFS_BLF_SHIFT) + (nbits << XFS_BLF_SHIFT));
+
+		/*
+		 * Do a sanity check if this is a dquot buffer. Just checking
+		 * the first dquot in the buffer should do. XXXThis is
+		 * probably a good thing to do for other buf types also.
+		 */
+		error = 0;
+		if (buf_f->blf_flags &
+		   (XFS_BLF_UDQUOT_BUF|XFS_BLF_PDQUOT_BUF|XFS_BLF_GDQUOT_BUF)) {
+			if (item->ri_buf[i].i_addr == NULL) {
+				xfs_alert(mp,
+					"XFS: NULL dquot in %s.", __func__);
+				goto next;
+			}
+			if (item->ri_buf[i].i_len < sizeof(xfs_disk_dquot_t)) {
+				xfs_alert(mp,
+					"XFS: dquot too small (%d) in %s.",
+					item->ri_buf[i].i_len, __func__);
+				goto next;
+			}
+			error = xfs_qm_dqcheck(mp, item->ri_buf[i].i_addr,
+					       -1, 0, XFS_QMOPT_DOWARN,
+					       "dquot_buf_recover");
+			if (error)
+				goto next;
+		}
+
+		memcpy(xfs_buf_offset(bp,
+			(uint)bit << XFS_BLF_SHIFT),	/* dest */
+			item->ri_buf[i].i_addr,		/* source */
+			nbits<<XFS_BLF_SHIFT);		/* length */
+ next:
+		i++;
+		bit += nbits;
+	}
+
+	/* Shouldn't be any more regions */
+	ASSERT(i == item->ri_total);
+
+	xlog_recovery_validate_buf_type(mp, bp, buf_f);
+
+}
+
+/*
  * Do some primitive error checking on ondisk dquot data structures.
  */
 int