[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, 68 insertions, 28 deletions

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 1d12e4f7d69f..b91dffd7a031 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -62,6 +62,43 @@ static void ext4_unlockfs(struct super_block *sb);
 static void ext4_write_super (struct super_block * sb);
 static void ext4_write_super_lockfs(struct super_block *sb);
 
+
+ext4_fsblk_t ext4_block_bitmap(struct ext4_group_desc *bg)
+{
+        return le32_to_cpu(bg->bg_block_bitmap) |
+                ((ext4_fsblk_t)le16_to_cpu(bg->bg_block_bitmap_hi) << 32);
+}
+
+ext4_fsblk_t ext4_inode_bitmap(struct ext4_group_desc *bg)
+{
+        return le32_to_cpu(bg->bg_inode_bitmap) |
+                ((ext4_fsblk_t)le16_to_cpu(bg->bg_inode_bitmap_hi) << 32);
+}
+
+ext4_fsblk_t ext4_inode_table(struct ext4_group_desc *bg)
+{
+        return le32_to_cpu(bg->bg_inode_table) |
+                ((ext4_fsblk_t)le16_to_cpu(bg->bg_inode_table_hi) << 32);
+}
+
+void ext4_block_bitmap_set(struct ext4_group_desc *bg, ext4_fsblk_t blk)
+{
+        bg->bg_block_bitmap = cpu_to_le32((u32)blk);
+        bg->bg_block_bitmap_hi = cpu_to_le16(blk >> 32);
+}
+
+void ext4_inode_bitmap_set(struct ext4_group_desc *bg, ext4_fsblk_t blk)
+{
+        bg->bg_inode_bitmap  = cpu_to_le32((u32)blk);
+        bg->bg_inode_bitmap_hi = cpu_to_le16(blk >> 32);
+}
+
+void ext4_inode_table_set(struct ext4_group_desc *bg, ext4_fsblk_t blk)
+{
+        bg->bg_inode_table = cpu_to_le32((u32)blk);
+        bg->bg_inode_table_hi = cpu_to_le16(blk >> 32);
+}
+
 /*
  * Wrappers for jbd2_journal_start/end.
  *
@@ -1182,6 +1219,9 @@ static int ext4_check_descriptors (struct super_block * sb)
         struct ext4_sb_info *sbi = EXT4_SB(sb);
         ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
         ext4_fsblk_t last_block;
+        ext4_fsblk_t block_bitmap;
+        ext4_fsblk_t inode_bitmap;
+        ext4_fsblk_t inode_table;
         struct ext4_group_desc * gdp = NULL;
         int desc_block = 0;
         int i;
@@ -1191,7 +1231,7 @@ static int ext4_check_descriptors (struct super_block * sb)
         for (i = 0; i < sbi->s_groups_count; i++)
         {
                 if (i == sbi->s_groups_count - 1)
-                        last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
+                        last_block = ext4_blocks_count(sbi->s_es) - 1;
                 else
                         last_block = first_block +
                                 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
@@ -1199,42 +1239,39 @@ static int ext4_check_descriptors (struct super_block * sb)
                 if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0)
                         gdp = (struct ext4_group_desc *)
                                         sbi->s_group_desc[desc_block++]->b_data;
-                if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
-                    le32_to_cpu(gdp->bg_block_bitmap) > last_block)
+                block_bitmap = ext4_block_bitmap(gdp);
+                if (block_bitmap < first_block || block_bitmap > last_block)
                 {
                         ext4_error (sb, "ext4_check_descriptors",
                                     "Block bitmap for group %d"
-                                    " not in group (block %lu)!",
-                                    i, (unsigned long)
-                                        le32_to_cpu(gdp->bg_block_bitmap));
+                                    " not in group (block "E3FSBLK")!",
+                                    i, block_bitmap);
                         return 0;
                 }
-                if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
-                    le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
+                inode_bitmap = ext4_inode_bitmap(gdp);
+                if (inode_bitmap < first_block || inode_bitmap > last_block)
                 {
                         ext4_error (sb, "ext4_check_descriptors",
                                     "Inode bitmap for group %d"
-                                    " not in group (block %lu)!",
-                                    i, (unsigned long)
-                                        le32_to_cpu(gdp->bg_inode_bitmap));
+                                    " not in group (block "E3FSBLK")!",
+                                    i, inode_bitmap);
                         return 0;
                 }
-                if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
-                    le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >
-                    last_block)
+                inode_table = ext4_inode_table(gdp);
+                if (inode_table < first_block ||
+                    inode_table + sbi->s_itb_per_group > last_block)
                 {
                         ext4_error (sb, "ext4_check_descriptors",
                                     "Inode table for group %d"
-                                    " not in group (block %lu)!",
-                                    i, (unsigned long)
-                                        le32_to_cpu(gdp->bg_inode_table));
+                                    " not in group (block "E3FSBLK")!",
+                                    i, inode_table);
                         return 0;
                 }
                 first_block += EXT4_BLOCKS_PER_GROUP(sb);
                 gdp++;
         }
 
-        sbi->s_es->s_free_blocks_count=cpu_to_le32(ext4_count_free_blocks(sb));
+        ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb));
         return 1;
 }
@@ -1411,6 +1448,7 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
         int i;
         int needs_recovery;
         __le32 features;
+        __u64 blocks_count;
 
         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
         if (!sbi)
@@ -1620,7 +1658,7 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
                 goto failed_mount;
         }
 
-        if (le32_to_cpu(es->s_blocks_count) >
+        if (ext4_blocks_count(es) >
                     (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
                 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
                         " too large to mount safely\n", sb->s_id);
@@ -1632,9 +1670,11 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
 
         if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
                 goto cantfind_ext4;
-        sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
-                               le32_to_cpu(es->s_first_data_block) - 1)
-                                       / EXT4_BLOCKS_PER_GROUP(sb)) + 1;
+        blocks_count = (ext4_blocks_count(es) -
+                        le32_to_cpu(es->s_first_data_block) +
+                        EXT4_BLOCKS_PER_GROUP(sb) - 1);
+        do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
+        sbi->s_groups_count = blocks_count;
         db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
                    EXT4_DESC_PER_BLOCK(sb);
         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
@@ -1949,7 +1989,7 @@ static journal_t *ext4_get_dev_journal(struct super_block *sb,
                 goto out_bdev;
         }
 
-        len = le32_to_cpu(es->s_blocks_count);
+        len = ext4_blocks_count(es);
         start = sb_block + 1;
         brelse(bh);     /* we're done with the superblock */
 
@@ -2119,7 +2159,7 @@ static void ext4_commit_super (struct super_block * sb,
         if (!sbh)
                 return;
         es->s_wtime = cpu_to_le32(get_seconds());
-        es->s_free_blocks_count = cpu_to_le32(ext4_count_free_blocks(sb));
+        ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
         es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
         BUFFER_TRACE(sbh, "marking dirty");
         mark_buffer_dirty(sbh);
@@ -2312,7 +2352,7 @@ static int ext4_remount (struct super_block * sb, int * flags, char * data)
         ext4_init_journal_params(sb, sbi->s_journal);
 
         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
-                n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
+                n_blocks_count > ext4_blocks_count(es)) {
                 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
                         err = -EROFS;
                         goto restore_opts;
@@ -2431,10 +2471,10 @@ static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
 
         buf->f_type = EXT4_SUPER_MAGIC;
         buf->f_bsize = sb->s_blocksize;
-        buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
+        buf->f_blocks = ext4_blocks_count(es) - overhead;
         buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter);
-        buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
-        if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
+        buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
+        if (buf->f_bfree < ext4_r_blocks_count(es))
                 buf->f_bavail = 0;
         buf->f_files = le32_to_cpu(es->s_inodes_count);
         buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter);