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Blame SOURCES/0169-xfs-Add-helpers-for-inode-size.patch

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From bc7e3f1e508c91b9ad7d3459998c5cd31d1caca0 Mon Sep 17 00:00:00 2001
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From: Jan Kara <jack@suse.cz>
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Date: Mon, 1 Jun 2015 14:28:45 +0200
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Subject: [PATCH 169/198] xfs: Add helpers for inode size
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Add helpers to return size of XFS inode on disk and when loaded in
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memory.
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Signed-off-by: Jan Kara <jack@suse.cz>
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---
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 grub-core/fs/xfs.c | 35 ++++++++++++++++++++++++-----------
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 1 file changed, 24 insertions(+), 11 deletions(-)
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diff --git a/grub-core/fs/xfs.c b/grub-core/fs/xfs.c
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index 0d704e9..26d8147 100644
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--- a/grub-core/fs/xfs.c
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+++ b/grub-core/fs/xfs.c
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@@ -255,6 +255,24 @@ grub_xfs_inode_offset (struct grub_xfs_data *data,
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 	  data->sblock.log2_inode);
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 }
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+static inline grub_size_t
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+grub_xfs_inode_size(struct grub_xfs_data *data)
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+{
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+  return 1 << data->sblock.log2_inode;
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+}
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+
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+/*
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+ * Returns size occupied by XFS inode stored in memory - we store struct
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+ * grub_fshelp_node there but on disk inode size may be actually larger than
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+ * struct grub_xfs_inode so we need to account for that so that we can read
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+ * from disk directly into in-memory structure.
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+ */
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+static inline grub_size_t
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+grub_xfs_fshelp_size(struct grub_xfs_data *data)
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+{
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+  return sizeof (struct grub_fshelp_node) - sizeof (struct grub_xfs_inode)
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+	       + grub_xfs_inode_size(data);
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+}
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 static grub_err_t
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 grub_xfs_read_inode (struct grub_xfs_data *data, grub_uint64_t ino,
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@@ -264,8 +282,8 @@ grub_xfs_read_inode (struct grub_xfs_data *data, grub_uint64_t ino,
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   int offset = grub_xfs_inode_offset (data, ino);
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   /* Read the inode.  */
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-  if (grub_disk_read (data->disk, block, offset,
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-		      1 << data->sblock.log2_inode, inode))
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+  if (grub_disk_read (data->disk, block, offset, grub_xfs_inode_size(data),
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+		      inode))
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     return grub_errno;
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   if (grub_strncmp ((char *) inode->magic, "IN", 2))
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@@ -297,7 +315,7 @@ grub_xfs_read_block (grub_fshelp_node_t node, grub_disk_addr_t fileblock)
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       if (node->inode.fork_offset)
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 	recoffset = (node->inode.fork_offset - 1) / 2;
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       else
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-	recoffset = ((1 << node->data->sblock.log2_inode)
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+	recoffset = (grub_xfs_inode_size(node->data)
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 		     - ((char *) &node->inode.data.btree.keys
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 			- (char *) &node->inode))
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 	  / (2 * sizeof (grub_uint64_t));
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@@ -456,9 +474,7 @@ static int iterate_dir_call_hook (grub_uint64_t ino, const char *filename,
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   struct grub_fshelp_node *fdiro;
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   grub_err_t err;
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-  fdiro = grub_malloc (sizeof (struct grub_fshelp_node)
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-		       - sizeof (struct grub_xfs_inode)
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-		       + (1 << ctx->diro->data->sblock.log2_inode) + 1);
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+  fdiro = grub_malloc (grub_xfs_fshelp_size(ctx->diro->data) + 1);
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   if (!fdiro)
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     {
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       grub_print_error ();
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@@ -682,7 +698,7 @@ grub_xfs_mount (grub_disk_t disk)
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   data = grub_realloc (data,
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 		       sizeof (struct grub_xfs_data)
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 		       - sizeof (struct grub_xfs_inode)
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-		       + (1 << data->sblock.log2_inode) + 1);
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+		       + grub_xfs_inode_size(data) + 1);
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   if (! data)
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     goto fail;
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@@ -797,10 +813,7 @@ grub_xfs_open (struct grub_file *file, const char *name)
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   if (fdiro != &data->diropen)
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     {
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-      grub_memcpy (&data->diropen, fdiro,
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-		   sizeof (struct grub_fshelp_node)
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-		   - sizeof (struct grub_xfs_inode)
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-		   + (1 << data->sblock.log2_inode));
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+      grub_memcpy (&data->diropen, fdiro, grub_xfs_fshelp_size(data));
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       grub_free (fdiro);
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     }
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-- 
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2.7.4
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