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xen/grub-ext4-support.patch

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Index: grub-0.97/stage2/fsys_ext2fs.c
===================================================================
--- grub-0.97.orig/stage2/fsys_ext2fs.c
+++ grub-0.97/stage2/fsys_ext2fs.c
@@ -41,6 +41,7 @@ typedef __signed__ short __s16;
typedef unsigned short __u16;
typedef __signed__ int __s32;
typedef unsigned int __u32;
+typedef unsigned long long __u64;
/*
* Constants relative to the data blocks, from ext2_fs.h
@@ -51,7 +52,7 @@ typedef unsigned int __u32;
#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
-/* include/linux/ext2_fs.h */
+/* lib/ext2fs/ext2_fs.h from e2fsprogs */
struct ext2_super_block
{
__u32 s_inodes_count; /* Inodes count */
@@ -61,9 +62,9 @@ struct ext2_super_block
__u32 s_free_inodes_count; /* Free inodes count */
__u32 s_first_data_block; /* First Data Block */
__u32 s_log_block_size; /* Block size */
- __s32 s_log_frag_size; /* Fragment size */
+ __s32 s_obso_log_frag_size; /* Obsoleted Fragment size */
__u32 s_blocks_per_group; /* # Blocks per group */
- __u32 s_frags_per_group; /* # Fragments per group */
+ __u32 s_obso_frags_per_group; /* Obsoleted Fragments per group */
__u32 s_inodes_per_group; /* # Inodes per group */
__u32 s_mtime; /* Mount time */
__u32 s_wtime; /* Write time */
@@ -72,7 +73,7 @@ struct ext2_super_block
__u16 s_magic; /* Magic signature */
__u16 s_state; /* File system state */
__u16 s_errors; /* Behaviour when detecting errors */
- __u16 s_pad;
+ __u16 s_minor_rev_level; /* minor revision level */
__u32 s_lastcheck; /* time of last check */
__u32 s_checkinterval; /* max. time between checks */
__u32 s_creator_os; /* OS */
@@ -119,15 +120,29 @@ struct ext2_super_block
__u32 s_hash_seed[4]; /* HTREE hash seed */
__u8 s_def_hash_version; /* Default hash version to use */
__u8 s_jnl_backup_type; /* Default type of journal backup */
- __u16 s_reserved_word_pad;
+ __u16 s_desc_size; /* size of group descriptor */
__u32 s_default_mount_opts;
__u32 s_first_meta_bg; /* First metablock group */
__u32 s_mkfs_time; /* When the filesystem was created */
__u32 s_jnl_blocks[17]; /* Backup of the journal inode */
- __u32 s_reserved[172]; /* Padding to the end of the block */
- };
+ /* 64bit desc support valid if EXT4_FEATURE_INCOMPAT_64BIT */
+ __u32 s_blocks_count_hi; /* Blocks count */
+ __u32 s_r_blocks_count_hi; /* Reserved blocks count */
+ __u32 s_free_blocks_count_hi; /* Free blocks count */
+ __u16 s_min_extra_isize; /* All inodes have at least # bytes */
+ __u16 s_max_extra_isize; /* New inodes should reverve # bytes */
+ __u32 s_flags; /* Miscellaneous flags */
+ __u16 s_raid_stride; /* Raid stride */
+ __u16 s_mmp_interval; /* # seconds to wait MMP checking */
+ __u64 s_mmp_block; /* Block for multi-mount protection */
+ __u32 s_raid_stripe_width; /* Blocks on all data disks (N*stride)*/
+ __u8 s_log_groups_per_flex;/* FLEX_BG group size*/
+ __u8 s_reserved_char_pad;
+ __u16 s_reserved_pad;
+ __u32 s_reserved[162]; /* Padding to the end of the block */
+};
-struct ext2_group_desc
+struct ext4_group_desc
{
__u32 bg_block_bitmap; /* Blocks bitmap block */
__u32 bg_inode_bitmap; /* Inodes bitmap block */
@@ -135,8 +150,18 @@ struct ext2_group_desc
__u16 bg_free_blocks_count; /* Free blocks count */
__u16 bg_free_inodes_count; /* Free inodes count */
__u16 bg_used_dirs_count; /* Directories count */
- __u16 bg_pad;
- __u32 bg_reserved[3];
+ __u16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
+ __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
+ __u16 bg_itable_unused; /* Unused inodes count */
+ __u16 bg_checksum; /* crc16(sb_uuid+group+desc) */
+ __u32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
+ __u32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
+ __u32 bg_inode_table_hi; /* Inodes table block MSB */
+ __u16 bg_free_blocks_count_hi;/* Free blocks count MSB */
+ __u16 bg_free_inodes_count_hi;/* Free inodes count MSB */
+ __u16 bg_used_dirs_count_hi; /* Directories count MSB */
+ __u16 bg_itable_unused_hi; /* Unused inodes count MSB */
+ __u32 bg_reserved2[3];
};
struct ext2_inode
@@ -174,22 +199,22 @@ struct ext2_inode
__u32 i_block[EXT2_N_BLOCKS]; /* 40: Pointers to blocks */
__u32 i_version; /* File version (for NFS) */
__u32 i_file_acl; /* File ACL */
- __u32 i_dir_acl; /* Directory ACL */
- __u32 i_faddr; /* Fragment address */
+ __u32 i_size_high;
+ __u32 i_obso_faddr; /* Obsoleted fragment address */
union
{
struct
{
- __u8 l_i_frag; /* Fragment number */
- __u8 l_i_fsize; /* Fragment size */
- __u16 i_pad1;
- __u32 l_i_reserved2[2];
+ __u16 l_i_blocks_high; /* were l_i_reserved1 */
+ __u16 l_i_file_acl_high;
+ __u16 l_i_uid_high; /* these 2 fields */
+ __u16 l_i_gid_high; /* were reserved2[0] */
+ __u32 l_i_reserved2;
}
linux2;
struct
{
- __u8 h_i_frag; /* Fragment number */
- __u8 h_i_fsize; /* Fragment size */
+ __u16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
__u16 h_i_mode_high;
__u16 h_i_uid_high;
__u16 h_i_gid_high;
@@ -198,16 +223,36 @@ struct ext2_inode
hurd2;
struct
{
- __u8 m_i_frag; /* Fragment number */
- __u8 m_i_fsize; /* Fragment size */
- __u16 m_pad1;
+ __u16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
+ __u16 m_i_file_acl_high;
__u32 m_i_reserved2[2];
}
masix2;
}
osd2; /* OS dependent 2 */
+ __u16 i_extra_isize;
+ __u16 i_pad1;
+ __u32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
+ __u32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
+ __u32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
+ __u32 i_crtime; /* File Creation time */
+ __u32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
+ __u32 i_version_hi; /* high 32 bits for 64-bit version */
};
+#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
+#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 /* grub not supported*/
+#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
+#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
+
+#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
+ ( sb->s_feature_incompat & mask )
+
+#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
+#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
+
+#define EXT4_MIN_DESC_SIZE 32
+
/* linux/limits.h */
#define NAME_MAX 255 /* # chars in a file name */
@@ -225,6 +270,57 @@ struct ext2_dir_entry
char name[EXT2_NAME_LEN]; /* File name */
};
+/* linux/ext4_fs_extents.h */
+/* This is the extent on-disk structure.
+ * It's used at the bottom of the tree.
+ */
+struct ext4_extent
+ {
+ __u32 ee_block; /* first logical block extent covers */
+ __u16 ee_len; /* number of blocks covered by extent */
+ __u16 ee_start_hi; /* high 16 bits of physical block */
+ __u32 ee_start_lo; /* low 32 bits of physical block */
+ };
+
+/*
+ * This is index on-disk structure.
+ * It's used at all the levels except the bottom.
+ */
+struct ext4_extent_idx
+ {
+ __u32 ei_block; /* index covers logical blocks from 'block' */
+ __u32 ei_leaf_lo; /* pointer to the physical block of the next *
+ * level. leaf or next index could be there */
+ __u16 ei_leaf_hi; /* high 16 bits of physical block */
+ __u16 ei_unused;
+ };
+
+/*
+ * Each block (leaves and indexes), even inode-stored has header.
+ */
+struct ext4_extent_header
+ {
+ __u16 eh_magic; /* probably will support different formats */
+ __u16 eh_entries; /* number of valid entries */
+ __u16 eh_max; /* capacity of store in entries */
+ __u16 eh_depth; /* has tree real underlying blocks? */
+ __u32 eh_generation; /* generation of the tree */
+ };
+
+#define EXT4_EXT_MAGIC (0xf30a)
+#define EXT_FIRST_EXTENT(__hdr__) \
+ ((struct ext4_extent *) (((char *) (__hdr__)) + \
+ sizeof(struct ext4_extent_header)))
+#define EXT_FIRST_INDEX(__hdr__) \
+ ((struct ext4_extent_idx *) (((char *) (__hdr__)) + \
+ sizeof(struct ext4_extent_header)))
+#define EXT_LAST_EXTENT(__hdr__) \
+ (EXT_FIRST_EXTENT((__hdr__)) + (__u16)((__hdr__)->eh_entries) - 1)
+#define EXT_LAST_INDEX(__hdr__) \
+ (EXT_FIRST_INDEX((__hdr__)) + (__u16)((__hdr__)->eh_entries) - 1)
+
+
+
/* linux/ext2fs.h */
/*
* EXT2_DIR_PAD defines the directory entries boundaries
@@ -271,8 +367,17 @@ struct ext2_dir_entry
/* kind of from ext2/super.c */
#define EXT2_BLOCK_SIZE(s) (1 << EXT2_BLOCK_SIZE_BITS(s))
/* linux/ext2fs.h */
+/* sizeof(struct ext2_group_desc) is changed in ext4
+ * in kernel code, ext2/3 uses sizeof(struct ext2_group_desc) to calculate
+ * number of desc per block, while ext4 uses superblock->s_desc_size in stead
+ * superblock->s_desc_size is not available in ext2/3
+ * */
+#define EXT2_DESC_SIZE(s) \
+ (EXT4_HAS_INCOMPAT_FEATURE(s,EXT4_FEATURE_INCOMPAT_64BIT)? \
+ s->s_desc_size : EXT4_MIN_DESC_SIZE)
#define EXT2_DESC_PER_BLOCK(s) \
- (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
+ (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s))
+
/* linux/stat.h */
#define S_IFMT 00170000
#define S_IFLNK 0120000
@@ -434,6 +539,122 @@ ext2fs_block_map (int logical_block)
[logical_block & (EXT2_ADDR_PER_BLOCK (SUPERBLOCK) - 1)];
}
+/* extent binary search index
+ * find closest index in the current level extent tree
+ * kind of from ext4_ext_binsearch_idx in ext4/extents.c
+ */
+static struct ext4_extent_idx*
+ext4_ext_binsearch_idx(struct ext4_extent_header* eh, int logical_block)
+{
+ struct ext4_extent_idx *r, *l, *m;
+ l = EXT_FIRST_INDEX(eh) + 1;
+ r = EXT_LAST_INDEX(eh);
+ while (l <= r)
+ {
+ m = l + (r - l) / 2;
+ if (logical_block < m->ei_block)
+ r = m - 1;
+ else
+ l = m + 1;
+ }
+ return (struct ext4_extent_idx*)(l - 1);
+}
+
+/* extent binary search
+ * find closest extent in the leaf level
+ * kind of from ext4_ext_binsearch in ext4/extents.c
+ */
+static struct ext4_extent*
+ext4_ext_binsearch(struct ext4_extent_header* eh, int logical_block)
+{
+ struct ext4_extent *r, *l, *m;
+ l = EXT_FIRST_EXTENT(eh) + 1;
+ r = EXT_LAST_EXTENT(eh);
+ while (l <= r)
+ {
+ m = l + (r - l) / 2;
+ if (logical_block < m->ee_block)
+ r = m - 1;
+ else
+ l = m + 1;
+ }
+ return (struct ext4_extent*)(l - 1);
+}
+
+/* Maps extents enabled logical block into physical block via an inode.
+ * EXT4_HUGE_FILE_FL should be checked before calling this.
+ */
+static int
+ext4fs_block_map (int logical_block)
+{
+ struct ext4_extent_header *eh;
+ struct ext4_extent *ex, *extent;
+ struct ext4_extent_idx *ei, *index;
+ int depth;
+ int i;
+
+#ifdef E2DEBUG
+ unsigned char *i;
+ for (i = (unsigned char *) INODE;
+ i < ((unsigned char *) INODE + sizeof (struct ext2_inode));
+ i++)
+ {
+ printf ("%c", "0123456789abcdef"[*i >> 4]);
+ printf ("%c", "0123456789abcdef"[*i % 16]);
+ if (!((i + 1 - (unsigned char *) INODE) % 16))
+ {
+ printf ("\n");
+ }
+ else
+ {
+ printf (" ");
+ }
+ }
+ printf ("logical block %d\n", logical_block);
+#endif /* E2DEBUG */
+ eh = (struct ext4_extent_header*)INODE->i_block;
+ if (eh->eh_magic != EXT4_EXT_MAGIC)
+ {
+ errnum = ERR_FSYS_CORRUPT;
+ return -1;
+ }
+ while((depth = eh->eh_depth) != 0)
+ { /* extent index */
+ if (eh->eh_magic != EXT4_EXT_MAGIC)
+ {
+ errnum = ERR_FSYS_CORRUPT;
+ return -1;
+ }
+ ei = ext4_ext_binsearch_idx(eh, logical_block);
+ if (ei->ei_leaf_hi)
+ {/* 64bit physical block number not supported */
+ errnum = ERR_FILELENGTH;
+ return -1;
+ }
+ if (!ext2_rdfsb(ei->ei_leaf_lo, DATABLOCK1))
+ {
+ errnum = ERR_FSYS_CORRUPT;
+ return -1;
+ }
+ eh = (struct ext4_extent_header*)DATABLOCK1;
+ }
+
+ /* depth==0, we come to the leaf */
+ ex = ext4_ext_binsearch(eh, logical_block);
+ if (ex->ee_start_hi)
+ {/* 64bit physical block number not supported */
+ errnum = ERR_FILELENGTH;
+ return -1;
+ }
+ if ((ex->ee_block + ex->ee_len) < logical_block)
+ {
+ errnum = ERR_FSYS_CORRUPT;
+ return -1;
+ }
+ return ex->ee_start_lo + logical_block - ex->ee_block;
+
+}
+
/* preconditions: all preconds of ext2fs_block_map */
int
ext2fs_read (char *buf, int len)
@@ -468,6 +689,11 @@ ext2fs_read (char *buf, int len)
/* find the (logical) block component of our location */
logical_block = filepos >> EXT2_BLOCK_SIZE_BITS (SUPERBLOCK);
offset = filepos & (EXT2_BLOCK_SIZE (SUPERBLOCK) - 1);
+ /* map extents enabled logical block number to physical fs on-disk block number */
+ if (EXT4_HAS_INCOMPAT_FEATURE(SUPERBLOCK,EXT4_FEATURE_INCOMPAT_EXTENTS)
+ && INODE->i_flags & EXT4_EXTENTS_FL)
+ map = ext4fs_block_map (logical_block);
+ else
map = ext2fs_block_map (logical_block);
#ifdef E2DEBUG
printf ("map=%d\n", map);
@@ -552,7 +778,7 @@ ext2fs_dir (char *dirname)
int desc; /* index within that group */
int ino_blk; /* fs pointer of the inode's information */
int str_chk = 0; /* used to hold the results of a string compare */
- struct ext2_group_desc *gdp;
+ struct ext4_group_desc *ext4_gdp;
struct ext2_inode *raw_inode; /* inode info corresponding to current_ino */
char linkbuf[PATH_MAX]; /* buffer for following symbolic links */
@@ -598,8 +824,15 @@ ext2fs_dir (char *dirname)
{
return 0;
}
- gdp = GROUP_DESC;
- ino_blk = gdp[desc].bg_inode_table +
+ ext4_gdp = (struct ext4_group_desc *)( (__u8*)GROUP_DESC +
+ desc * EXT2_DESC_SIZE(SUPERBLOCK));
+ if (EXT4_HAS_INCOMPAT_FEATURE(SUPERBLOCK, EXT4_FEATURE_INCOMPAT_64BIT)
+ && (! ext4_gdp->bg_inode_table_hi))
+ {/* 64bit itable not supported */
+ errnum = ERR_FILELENGTH;
+ return -1;
+ }
+ ino_blk = ext4_gdp->bg_inode_table +
(((current_ino - 1) % (SUPERBLOCK->s_inodes_per_group))
>> log2 (EXT2_INODES_PER_BLOCK (SUPERBLOCK)));
#ifdef E2DEBUG
@@ -676,7 +909,10 @@ ext2fs_dir (char *dirname)
}
linkbuf[filemax + len] = '\0';
- /* Read the symlink data. */
+ /* Read the symlink data.
+ * Slow symlink is extents enabled
+ * But since grub_read invokes ext2fs_read, nothing to change here
+ */
if (! ext2_is_fast_symlink ())
{
/* Read the necessary blocks, and reset the file pointer. */
@@ -687,7 +923,9 @@ ext2fs_dir (char *dirname)
}
else
{
- /* Copy the data directly from the inode. */
+ /* Copy the data directly from the inode.
+ * Fast symlink is not extents enabled
+ */
len = filemax;
memmove (linkbuf, (char *) INODE->i_block, len);
}
@@ -721,6 +959,13 @@ ext2fs_dir (char *dirname)
errnum = ERR_BAD_FILETYPE;
return 0;
}
+ /* if file is too large, just stop and report an error*/
+ if ( (INODE->i_flags & EXT4_HUGE_FILE_FL) && !(INODE->i_size_high))
+ {
+ /* file too large, stop reading */
+ errnum = ERR_FILELENGTH;
+ return 0;
+ }
filemax = (INODE->i_size);
return 1;
@@ -775,17 +1020,28 @@ ext2fs_dir (char *dirname)
}
/* else, find the (logical) block component of our location */
+ /* ext4 logical block number the same as ext2/3 */
blk = loc >> EXT2_BLOCK_SIZE_BITS (SUPERBLOCK);
/* we know which logical block of the directory entry we are looking
for, now we have to translate that to the physical (fs) block on
the disk */
+ /* map extents enabled logical block number to physical fs on-disk block number */
+ if (EXT4_HAS_INCOMPAT_FEATURE(SUPERBLOCK,EXT4_FEATURE_INCOMPAT_EXTENTS)
+ && INODE->i_flags & EXT4_EXTENTS_FL)
+ map = ext4fs_block_map (blk);
+ else
map = ext2fs_block_map (blk);
#ifdef E2DEBUG
printf ("fs block=%d\n", map);
#endif /* E2DEBUG */
mapblock2 = -1;
- if ((map < 0) || !ext2_rdfsb (map, DATABLOCK2))
+ if (map < 0)
+ {
+ *rest = ch;
+ return 0;
+ }
+ if (!ext2_rdfsb (map, DATABLOCK2))
{
errnum = ERR_FSYS_CORRUPT;
*rest = ch;
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