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From 0000000000000000000000000000000000000000 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] 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 0d704e9a4d4..26d8147a92e 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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