ext4: New inode allocation for FLEX_BG meta-data groups.

[pandora-kernel.git] / fs / ext4 / super.c

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 588cfb4..b9ad3d8 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -517,6 +517,7 @@ static void ext4_put_super (struct super_block * sb)
        for (i = 0; i < sbi->s_gdb_count; i++)
                brelse(sbi->s_group_desc[i]);
        kfree(sbi->s_group_desc);
+       kfree(sbi->s_flex_groups);
        percpu_counter_destroy(&sbi->s_freeblocks_counter);
        percpu_counter_destroy(&sbi->s_freeinodes_counter);
        percpu_counter_destroy(&sbi->s_dirs_counter);
@@ -1442,6 +1443,54 @@ static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
        return res;
 }
 
+static int ext4_fill_flex_info(struct super_block *sb)
+{
+       struct ext4_sb_info *sbi = EXT4_SB(sb);
+       struct ext4_group_desc *gdp = NULL;
+       struct buffer_head *bh;
+       ext4_group_t flex_group_count;
+       ext4_group_t flex_group;
+       int groups_per_flex = 0;
+       __u64 block_bitmap = 0;
+       int i;
+
+       if (!sbi->s_es->s_log_groups_per_flex) {
+               sbi->s_log_groups_per_flex = 0;
+               return 1;
+       }
+
+       sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
+       groups_per_flex = 1 << sbi->s_log_groups_per_flex;
+
+       flex_group_count = (sbi->s_groups_count + groups_per_flex - 1) /
+               groups_per_flex;
+       sbi->s_flex_groups = kmalloc(flex_group_count *
+                                    sizeof(struct flex_groups), GFP_KERNEL);
+       if (sbi->s_flex_groups == NULL) {
+               printk(KERN_ERR "EXT4-fs: not enough memory\n");
+               goto failed;
+       }
+       memset(sbi->s_flex_groups, 0, flex_group_count *
+              sizeof(struct flex_groups));
+
+       gdp = ext4_get_group_desc(sb, 1, &bh);
+       block_bitmap = ext4_block_bitmap(sb, gdp) - 1;
+
+       for (i = 0; i < sbi->s_groups_count; i++) {
+               gdp = ext4_get_group_desc(sb, i, &bh);
+
+               flex_group = ext4_flex_group(sbi, i);
+               sbi->s_flex_groups[flex_group].free_inodes +=
+                       le16_to_cpu(gdp->bg_free_inodes_count);
+               sbi->s_flex_groups[flex_group].free_blocks +=
+                       le16_to_cpu(gdp->bg_free_blocks_count);
+       }
+
+       return 1;
+failed:
+       return 0;
+}
+
 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
                            struct ext4_group_desc *gdp)
 {
@@ -2137,6 +2186,14 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
                printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
                goto failed_mount2;
        }
+       if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
+               if (!ext4_fill_flex_info(sb)) {
+                       printk(KERN_ERR
+                              "EXT4-fs: unable to initialize "
+                              "flex_bg meta info!\n");
+                       goto failed_mount2;
+               }
+
        sbi->s_gdb_count = db_count;
        get_random_bytes(&sbi->s_next_generation, sizeof(u32));
        spin_lock_init(&sbi->s_next_gen_lock);