[PATCH] ext4: 64bit metadata

In-kernel super block changes to support >32 bit free blocks numbers.

Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Alexandre Ratchov <alexandre.ratchov@bull.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 73 insertions, 13 deletions

diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h
index 63ed89f5b27b..8e5009ee4ad8 100644
--- a/include/linux/ext4_fs.h
+++ b/include/linux/ext4_fs.h
@@ -128,10 +128,17 @@ struct ext4_group_desc
         __le16  bg_free_blocks_count;   /* Free blocks count */
         __le16  bg_free_inodes_count;   /* Free inodes count */
         __le16  bg_used_dirs_count;     /* Directories count */
-        __u16   bg_pad;
-        __le32  bg_reserved[3];
+        __u16   bg_flags;
+        __le16  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
+        __le16  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
+        __le16  bg_inode_table_hi;      /* Inodes table block MSB */
+        __u16   bg_reserved[3];
 };
 
+#ifdef __KERNEL__
+#include <linux/ext4_fs_i.h>
+#include <linux/ext4_fs_sb.h>
+#endif
 /*
  * Macro-instructions used to manage group descriptors
  */
@@ -194,9 +201,9 @@ struct ext4_group_desc
 /* Used to pass group descriptor data when online resize is done */
 struct ext4_new_group_input {
         __u32 group;            /* Group number for this data */
-        __u32 block_bitmap;     /* Absolute block number of block bitmap */
-        __u32 inode_bitmap;     /* Absolute block number of inode bitmap */
-        __u32 inode_table;      /* Absolute block number of inode table start */
+        __u64 block_bitmap;     /* Absolute block number of block bitmap */
+        __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
+        __u64 inode_table;      /* Absolute block number of inode table start */
         __u32 blocks_count;     /* Total number of blocks in this group */
         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
         __u16 unused;
@@ -205,9 +212,9 @@ struct ext4_new_group_input {
 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 struct ext4_new_group_data {
         __u32 group;
-        __u32 block_bitmap;
-        __u32 inode_bitmap;
-        __u32 inode_table;
+        __u64 block_bitmap;
+        __u64 inode_bitmap;
+        __u64 inode_table;
         __u32 blocks_count;
         __u16 reserved_blocks;
         __u16 unused;
@@ -494,14 +501,18 @@ struct ext4_super_block {
         __u8    s_def_hash_version;     /* Default hash version to use */
         __u8    s_reserved_char_pad;
         __u16   s_reserved_word_pad;
-        __le32  s_default_mount_opts;
+/*100*/ __le32  s_default_mount_opts;
         __le32  s_first_meta_bg;        /* First metablock block group */
-        __u32   s_reserved[190];        /* Padding to the end of the block */
+        __le32  s_mkfs_time;            /* When the filesystem was created */
+        __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
+        /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
+/*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
+        __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
+        __le32  s_free_blocks_count_hi; /* Free blocks count */
+        __u32   s_reserved[169];        /* Padding to the end of the block */
 };
 
 #ifdef __KERNEL__
-#include <linux/ext4_fs_i.h>
-#include <linux/ext4_fs_sb.h>
 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
 {
         return sb->s_fs_info;
@@ -588,12 +599,14 @@ static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
+#define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
 
 #define EXT4_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
                                          EXT4_FEATURE_INCOMPAT_META_BG| \
-                                         EXT4_FEATURE_INCOMPAT_EXTENTS)
+                                         EXT4_FEATURE_INCOMPAT_EXTENTS| \
+                                         EXT4_FEATURE_INCOMPAT_64BIT)
 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
@@ -888,6 +901,53 @@ extern void ext4_abort (struct super_block *, const char *, const char *, ...)
 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
         __attribute__ ((format (printf, 3, 4)));
 extern void ext4_update_dynamic_rev (struct super_block *sb);
+extern ext4_fsblk_t ext4_block_bitmap(struct ext4_group_desc *bg);
+extern ext4_fsblk_t ext4_inode_bitmap(struct ext4_group_desc *bg);
+extern ext4_fsblk_t ext4_inode_table(struct ext4_group_desc *bg);
+extern void ext4_block_bitmap_set(struct ext4_group_desc *bg, ext4_fsblk_t blk);
+extern void ext4_inode_bitmap_set(struct ext4_group_desc *bg, ext4_fsblk_t blk);
+extern void ext4_inode_table_set(struct ext4_group_desc *bg, ext4_fsblk_t blk);
+
+static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
+{
+        return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
+                le32_to_cpu(es->s_blocks_count);
+}
+
+static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
+{
+        return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
+                le32_to_cpu(es->s_r_blocks_count);
+}
+
+static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
+{
+        return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
+                le32_to_cpu(es->s_free_blocks_count);
+}
+
+static inline void ext4_blocks_count_set(struct ext4_super_block *es,
+                                         ext4_fsblk_t blk)
+{
+        es->s_blocks_count = cpu_to_le32((u32)blk);
+        es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
+}
+
+static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
+                                              ext4_fsblk_t blk)
+{
+        es->s_free_blocks_count = cpu_to_le32((u32)blk);
+        es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
+}
+
+static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
+                                           ext4_fsblk_t blk)
+{
+        es->s_r_blocks_count = cpu_to_le32((u32)blk);
+        es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
+}
+
+
 
 #define ext4_std_error(sb, errno)                               \
 do {                                                            \