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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] PV-GRUB: add support for ext4
# HG changeset patch # User Matt Wilson <msw@xxxxxxxxxx> # Date 1333534154 -3600 # Node ID d1c985425e7841891ec1e3c0d4dc224be7b8d3cc # Parent 1fa1ba79759ac934f03caf974b79fe6d4acca00f PV-GRUB: add support for ext4 This patch adds support for ext4 to the GRUB tree used to build PV-GRUB. The original patch is taken from the Fedora GRUB package in this commit: http://pkgs.fedoraproject.org/gitweb/?p=grub.git;a=commitdiff;h=32bf414af04d377055957167aac7dedec691ef57 Signed-off-by: Matt Wilson <msw@xxxxxxxxxx> Committed-by: Ian Jackson <ian.jackson.citrix.com> Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx> --- diff -r 1fa1ba79759a -r d1c985425e78 stubdom/grub.patches/60ext4.diff --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/stubdom/grub.patches/60ext4.diff Wed Apr 04 11:09:14 2012 +0100 @@ -0,0 +1,474 @@ +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; _______________________________________________ Xen-changelog mailing list Xen-changelog@xxxxxxxxxxxxx http://lists.xensource.com/xen-changelog
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