From c545d0bb2fe87b5a8ea6a903e4e9c113595ccfff Mon Sep 17 00:00:00 2001
From: Vladimir 'phcoder' Serbinenko <phcoder@gmail.com>
Date: Mon, 2 Jul 2012 11:28:42 +0200
Subject: [PATCH 007/364] * grub-core/fs/ext2.c: Experimental support
for 64-bit.
---
ChangeLog | 4 ++++
grub-core/fs/ext2.c | 56 +++++++++++++++++++++++++++++++++++++++++------------
2 files changed, 48 insertions(+), 12 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index 12de11f..93ad0ac 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
2012-07-02 Vladimir Serbinenko <phcoder@gmail.com>
+ * grub-core/fs/ext2.c: Experimental support for 64-bit.
+
+2012-07-02 Vladimir Serbinenko <phcoder@gmail.com>
+
* grub-core/net/tftp.c (ack): Fix endianness problem.
(tftp_receive): Likewise.
Reported by: Michael Davidsaver.
diff --git a/grub-core/fs/ext2.c b/grub-core/fs/ext2.c
index c50e379..bd1ab24 100644
--- a/grub-core/fs/ext2.c
+++ b/grub-core/fs/ext2.c
@@ -65,7 +65,8 @@ GRUB_MOD_LICENSE ("GPLv3+");
/* The inode size. */
#define EXT2_INODE_SIZE(data) \
- (EXT2_REVISION (data) == EXT2_GOOD_OLD_REVISION \
+ (data->sblock.revision_level \
+ == grub_cpu_to_le32_compile_time (EXT2_GOOD_OLD_REVISION) \
? EXT2_GOOD_OLD_INODE_SIZE \
: grub_le_to_cpu16 (data->sblock.inode_size))
@@ -105,7 +106,8 @@ GRUB_MOD_LICENSE ("GPLv3+");
* flags here as the related features are implemented into the driver. */
#define EXT2_DRIVER_SUPPORTED_INCOMPAT ( EXT2_FEATURE_INCOMPAT_FILETYPE \
| EXT4_FEATURE_INCOMPAT_EXTENTS \
- | EXT4_FEATURE_INCOMPAT_FLEX_BG )
+ | EXT4_FEATURE_INCOMPAT_FLEX_BG \
+ | EXT4_FEATURE_INCOMPAT_64BIT)
/* List of rationales for the ignored "incompatible" features:
* needs_recovery: Not really back-incompatible - was added as such to forbid
* ext2 drivers from mounting an ext3 volume with a dirty
@@ -179,7 +181,7 @@ struct grub_ext2_sblock
grub_uint32_t hash_seed[4];
grub_uint8_t def_hash_version;
grub_uint8_t jnl_backup_type;
- grub_uint16_t reserved_word_pad;
+ grub_uint16_t group_desc_size;
grub_uint32_t default_mount_opts;
grub_uint32_t first_meta_bg;
grub_uint32_t mkfs_time;
@@ -197,6 +199,14 @@ struct grub_ext2_block_group
grub_uint16_t used_dirs;
grub_uint16_t pad;
grub_uint32_t reserved[3];
+ grub_uint32_t block_id_hi;
+ grub_uint32_t inode_id_hi;
+ grub_uint32_t inode_table_id_hi;
+ grub_uint16_t free_blocks_hi;
+ grub_uint16_t free_inodes_hi;
+ grub_uint16_t used_dirs_hi;
+ grub_uint16_t pad2;
+ grub_uint32_t reserved2[3];
};
/* The ext2 inode. */
@@ -310,6 +320,7 @@ struct grub_fshelp_node
struct grub_ext2_data
{
struct grub_ext2_sblock sblock;
+ int log_group_desc_size;
grub_disk_t disk;
struct grub_ext2_inode *inode;
struct grub_fshelp_node diropen;
@@ -328,7 +339,7 @@ grub_ext2_blockgroup (struct grub_ext2_data *data, int group,
return grub_disk_read (data->disk,
((grub_le_to_cpu32 (data->sblock.first_data_block) + 1)
<< LOG2_EXT2_BLOCK_SIZE (data)),
- group * sizeof (struct grub_ext2_block_group),
+ group << data->log_group_desc_size,
sizeof (struct grub_ext2_block_group), blkgrp);
}
@@ -362,7 +373,7 @@ grub_ext4_find_leaf (struct grub_ext2_data *data, grub_properly_aligned_t *buf,
return 0;
block = grub_le_to_cpu16 (index[i].leaf_hi);
- block = (block << 32) + grub_le_to_cpu32 (index[i].leaf);
+ block = (block << 32) | grub_le_to_cpu32 (index[i].leaf);
if (grub_disk_read (data->disk,
block << LOG2_EXT2_BLOCK_SIZE (data),
0, EXT2_BLOCK_SIZE(data), buf))
@@ -377,11 +388,11 @@ grub_ext2_read_block (grub_fshelp_node_t node, grub_disk_addr_t fileblock)
{
struct grub_ext2_data *data = node->data;
struct grub_ext2_inode *inode = &node->inode;
- int blknr = -1;
+ grub_disk_addr_t blknr = -1;
unsigned int blksz = EXT2_BLOCK_SIZE (data);
int log2_blksz = LOG2_EXT2_BLOCK_SIZE (data);
- if (grub_le_to_cpu32(inode->flags) & EXT4_EXTENTS_FLAG)
+ if (inode->flags & grub_cpu_to_le32_compile_time (EXT4_EXTENTS_FLAG))
{
GRUB_PROPERLY_ALIGNED_ARRAY (buf, EXT2_BLOCK_SIZE(data));
struct grub_ext4_extent_header *leaf;
@@ -535,6 +546,7 @@ grub_ext2_read_inode (struct grub_ext2_data *data,
int inodes_per_block;
unsigned int blkno;
unsigned int blkoff;
+ grub_disk_addr_t base;
/* It is easier to calculate if the first inode is 0. */
ino--;
@@ -551,10 +563,14 @@ grub_ext2_read_inode (struct grub_ext2_data *data,
blkoff = (ino % grub_le_to_cpu32 (sblock->inodes_per_group))
% inodes_per_block;
+ base = grub_le_to_cpu32 (blkgrp.inode_table_id);
+ if (data->log_group_desc_size >= 6)
+ base |= (((grub_disk_addr_t) grub_le_to_cpu32 (blkgrp.inode_table_id_hi))
+ << 32);
+
/* Read the inode. */
if (grub_disk_read (data->disk,
- (((grub_disk_addr_t) grub_le_to_cpu32 (blkgrp.inode_table_id) + blkno)
- << LOG2_EXT2_BLOCK_SIZE (data)),
+ ((base + blkno) << LOG2_EXT2_BLOCK_SIZE (data)),
EXT2_INODE_SIZE (data) * blkoff,
sizeof (struct grub_ext2_inode), inode))
return grub_errno;
@@ -578,7 +594,7 @@ grub_ext2_mount (grub_disk_t disk)
goto fail;
/* Make sure this is an ext2 filesystem. */
- if (grub_le_to_cpu16 (data->sblock.magic) != EXT2_MAGIC
+ if (data->sblock.magic != grub_cpu_to_le16_compile_time (EXT2_MAGIC)
|| grub_le_to_cpu32 (data->sblock.log2_block_size) >= 16)
{
grub_error (GRUB_ERR_BAD_FS, "not an ext2 filesystem");
@@ -586,13 +602,29 @@ grub_ext2_mount (grub_disk_t disk)
}
/* Check the FS doesn't have feature bits enabled that we don't support. */
- if (grub_le_to_cpu32 (data->sblock.feature_incompat)
- & ~(EXT2_DRIVER_SUPPORTED_INCOMPAT | EXT2_DRIVER_IGNORED_INCOMPAT))
+ if (data->sblock.revision_level != grub_cpu_to_le32_compile_time (EXT2_GOOD_OLD_REVISION)
+ && (data->sblock.feature_incompat
+ & grub_cpu_to_le32_compile_time (~(EXT2_DRIVER_SUPPORTED_INCOMPAT
+ | EXT2_DRIVER_IGNORED_INCOMPAT))))
{
grub_error (GRUB_ERR_BAD_FS, "filesystem has unsupported incompatible features");
goto fail;
}
+ if (data->sblock.revision_level != grub_cpu_to_le32_compile_time (EXT2_GOOD_OLD_REVISION)
+ && (data->sblock.feature_incompat
+ & grub_cpu_to_le32_compile_time (EXT4_FEATURE_INCOMPAT_64BIT))
+ && data->sblock.group_desc_size != 0
+ && ((data->sblock.group_desc_size & (data->sblock.group_desc_size - 1))
+ == 0)
+ && (data->sblock.group_desc_size & grub_cpu_to_le16_compile_time (0x1fe0)))
+ {
+ grub_uint16_t b = grub_le_to_cpu16 (data->sblock.group_desc_size);
+ for (data->log_group_desc_size = 0; b != (1 << data->log_group_desc_size);
+ data->log_group_desc_size++);
+ }
+ else
+ data->log_group_desc_size = 5;
data->disk = disk;
--
1.8.1.4