1 files changed, 462 insertions, 167 deletions

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 444ad998f72e..918aec0c8a11 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -100,7 +100,7 @@
  * inode as:
  *
  *  {                        page                        }
- *  [ group 0 buddy][ group 0 bitmap] [group 1][ group 1]...
+ *  [ group 0 bitmap][ group 0 buddy] [group 1][ group 1]...
  *
  *
  * one block each for bitmap and buddy information.  So for each group we
@@ -330,6 +330,18 @@
  *        object
  *
  */
+static struct kmem_cache *ext4_pspace_cachep;
+static struct kmem_cache *ext4_ac_cachep;
+static struct kmem_cache *ext4_free_ext_cachep;
+static void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap,
+                                        ext4_group_t group);
+static void ext4_mb_generate_from_freelist(struct super_block *sb, void *bitmap,
+                                                ext4_group_t group);
+static int ext4_mb_init_per_dev_proc(struct super_block *sb);
+static int ext4_mb_destroy_per_dev_proc(struct super_block *sb);
+static void release_blocks_on_commit(journal_t *journal, transaction_t *txn);
+
+
 
 static inline void *mb_correct_addr_and_bit(int *bit, void *addr)
 {
@@ -445,9 +457,9 @@ static void mb_free_blocks_double(struct inode *inode, struct ext4_buddy *e4b,
                         blocknr += first + i;
                         blocknr +=
                             le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
-
-                        ext4_error(sb, __func__, "double-free of inode"
-                                   " %lu's block %llu(bit %u in group %lu)\n",
+                        ext4_grp_locked_error(sb, e4b->bd_group,
+                                   __func__, "double-free of inode"
+                                   " %lu's block %llu(bit %u in group %u)",
                                    inode ? inode->i_ino : 0, blocknr,
                                    first + i, e4b->bd_group);
                 }
@@ -477,7 +489,7 @@ static void mb_cmp_bitmaps(struct ext4_buddy *e4b, void *bitmap)
                 b2 = (unsigned char *) bitmap;
                 for (i = 0; i < e4b->bd_sb->s_blocksize; i++) {
                         if (b1[i] != b2[i]) {
-                                printk(KERN_ERR "corruption in group %lu "
+                                printk(KERN_ERR "corruption in group %u "
                                        "at byte %u(%u): %x in copy != %x "
                                        "on disk/prealloc\n",
                                        e4b->bd_group, i, i * 8, b1[i], b2[i]);
@@ -690,8 +702,8 @@ static void ext4_mb_generate_buddy(struct super_block *sb,
         grp->bb_fragments = fragments;
 
         if (free != grp->bb_free) {
-                ext4_error(sb, __func__,
-                        "EXT4-fs: group %lu: %u blocks in bitmap, %u in gd\n",
+                ext4_grp_locked_error(sb, group,  __func__,
+                        "EXT4-fs: group %u: %u blocks in bitmap, %u in gd",
                         group, free, grp->bb_free);
                 /*
                  * If we intent to continue, we consider group descritor
@@ -716,7 +728,7 @@ static void ext4_mb_generate_buddy(struct super_block *sb,
  * stored in the inode as
  *
  * {                        page                        }
- * [ group 0 buddy][ group 0 bitmap] [group 1][ group 1]...
+ * [ group 0 bitmap][ group 0 buddy] [group 1][ group 1]...
  *
  *
  * one block each for bitmap and buddy information.
@@ -782,25 +794,45 @@ static int ext4_mb_init_cache(struct page *page, char *incore)
                 if (bh[i] == NULL)
                         goto out;
 
-                if (buffer_uptodate(bh[i]) &&
-                    !(desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)))
+                if (bitmap_uptodate(bh[i]))
                         continue;
 
                 lock_buffer(bh[i]);
+                if (bitmap_uptodate(bh[i])) {
+                        unlock_buffer(bh[i]);
+                        continue;
+                }
                 spin_lock(sb_bgl_lock(EXT4_SB(sb), first_group + i));
                 if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
                         ext4_init_block_bitmap(sb, bh[i],
                                                 first_group + i, desc);
+                        set_bitmap_uptodate(bh[i]);
                         set_buffer_uptodate(bh[i]);
-                        unlock_buffer(bh[i]);
                         spin_unlock(sb_bgl_lock(EXT4_SB(sb), first_group + i));
+                        unlock_buffer(bh[i]);
                         continue;
                 }
                 spin_unlock(sb_bgl_lock(EXT4_SB(sb), first_group + i));
+                if (buffer_uptodate(bh[i])) {
+                        /*
+                         * if not uninit if bh is uptodate,
+                         * bitmap is also uptodate
+                         */
+                        set_bitmap_uptodate(bh[i]);
+                        unlock_buffer(bh[i]);
+                        continue;
+                }
                 get_bh(bh[i]);
+                /*
+                 * submit the buffer_head for read. We can
+                 * safely mark the bitmap as uptodate now.
+                 * We do it here so the bitmap uptodate bit
+                 * get set with buffer lock held.
+                 */
+                set_bitmap_uptodate(bh[i]);
                 bh[i]->b_end_io = end_buffer_read_sync;
                 submit_bh(READ, bh[i]);
-                mb_debug("read bitmap for group %lu\n", first_group + i);
+                mb_debug("read bitmap for group %u\n", first_group + i);
         }
 
         /* wait for I/O completion */
@@ -814,6 +846,8 @@ static int ext4_mb_init_cache(struct page *page, char *incore)
 
         err = 0;
         first_block = page->index * blocks_per_page;
+        /* init the page  */
+        memset(page_address(page), 0xff, PAGE_CACHE_SIZE);
         for (i = 0; i < blocks_per_page; i++) {
                 int group;
                 struct ext4_group_info *grinfo;
@@ -840,7 +874,6 @@ static int ext4_mb_init_cache(struct page *page, char *incore)
                         BUG_ON(incore == NULL);
                         mb_debug("put buddy for group %u in page %lu/%x\n",
                                 group, page->index, i * blocksize);
-                        memset(data, 0xff, blocksize);
                         grinfo = ext4_get_group_info(sb, group);
                         grinfo->bb_fragments = 0;
                         memset(grinfo->bb_counters, 0,
@@ -848,7 +881,9 @@ static int ext4_mb_init_cache(struct page *page, char *incore)
                         /*
                          * incore got set to the group block bitmap below
                          */
+                        ext4_lock_group(sb, group);
                         ext4_mb_generate_buddy(sb, data, incore, group);
+                        ext4_unlock_group(sb, group);
                         incore = NULL;
                 } else {
                         /* this is block of bitmap */
@@ -862,6 +897,7 @@ static int ext4_mb_init_cache(struct page *page, char *incore)
 
                         /* mark all preallocated blks used in in-core bitmap */
                         ext4_mb_generate_from_pa(sb, data, group);
+                        ext4_mb_generate_from_freelist(sb, data, group);
                         ext4_unlock_group(sb, group);
 
                         /* set incore so that the buddy information can be
@@ -886,18 +922,20 @@ static noinline_for_stack int
 ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
                                         struct ext4_buddy *e4b)
 {
-        struct ext4_sb_info *sbi = EXT4_SB(sb);
-        struct inode *inode = sbi->s_buddy_cache;
         int blocks_per_page;
         int block;
         int pnum;
         int poff;
         struct page *page;
         int ret;
+        struct ext4_group_info *grp;
+        struct ext4_sb_info *sbi = EXT4_SB(sb);
+        struct inode *inode = sbi->s_buddy_cache;
 
-        mb_debug("load group %lu\n", group);
+        mb_debug("load group %u\n", group);
 
         blocks_per_page = PAGE_CACHE_SIZE / sb->s_blocksize;
+        grp = ext4_get_group_info(sb, group);
 
         e4b->bd_blkbits = sb->s_blocksize_bits;
         e4b->bd_info = ext4_get_group_info(sb, group);
@@ -905,6 +943,15 @@ ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
         e4b->bd_group = group;
         e4b->bd_buddy_page = NULL;
         e4b->bd_bitmap_page = NULL;
+        e4b->alloc_semp = &grp->alloc_sem;
+
+        /* Take the read lock on the group alloc
+         * sem. This would make sure a parallel
+         * ext4_mb_init_group happening on other
+         * groups mapped by the page is blocked
+         * till we are done with allocation
+         */
+        down_read(e4b->alloc_semp);
 
         /*
          * the buddy cache inode stores the block bitmap
@@ -920,6 +967,14 @@ ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
         page = find_get_page(inode->i_mapping, pnum);
         if (page == NULL || !PageUptodate(page)) {
                 if (page)
+                        /*
+                         * drop the page reference and try
+                         * to get the page with lock. If we
+                         * are not uptodate that implies
+                         * somebody just created the page but
+                         * is yet to initialize the same. So
+                         * wait for it to initialize.
+                         */
                         page_cache_release(page);
                 page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS);
                 if (page) {
@@ -985,6 +1040,9 @@ err:
                 page_cache_release(e4b->bd_buddy_page);
         e4b->bd_buddy = NULL;
         e4b->bd_bitmap = NULL;
+
+        /* Done with the buddy cache */
+        up_read(e4b->alloc_semp);
         return ret;
 }
 
@@ -994,6 +1052,9 @@ static void ext4_mb_release_desc(struct ext4_buddy *e4b)
                 page_cache_release(e4b->bd_bitmap_page);
         if (e4b->bd_buddy_page)
                 page_cache_release(e4b->bd_buddy_page);
+        /* Done with the buddy cache */
+        if (e4b->alloc_semp)
+                up_read(e4b->alloc_semp);
 }
 
 
@@ -1031,7 +1092,10 @@ static void mb_clear_bits(spinlock_t *lock, void *bm, int cur, int len)
                         cur += 32;
                         continue;
                 }
-                mb_clear_bit_atomic(lock, cur, bm);
+                if (lock)
+                        mb_clear_bit_atomic(lock, cur, bm);
+                else
+                        mb_clear_bit(cur, bm);
                 cur++;
         }
 }
@@ -1049,7 +1113,10 @@ static void mb_set_bits(spinlock_t *lock, void *bm, int cur, int len)
                         cur += 32;
                         continue;
                 }
-                mb_set_bit_atomic(lock, cur, bm);
+                if (lock)
+                        mb_set_bit_atomic(lock, cur, bm);
+                else
+                        mb_set_bit(cur, bm);
                 cur++;
         }
 }
@@ -1094,12 +1161,11 @@ static void mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
                         blocknr += block;
                         blocknr +=
                             le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
-                        ext4_unlock_group(sb, e4b->bd_group);
-                        ext4_error(sb, __func__, "double-free of inode"
-                                   " %lu's block %llu(bit %u in group %lu)\n",
+                        ext4_grp_locked_error(sb, e4b->bd_group,
+                                   __func__, "double-free of inode"
+                                   " %lu's block %llu(bit %u in group %u)",
                                    inode ? inode->i_ino : 0, blocknr, block,
                                    e4b->bd_group);
-                        ext4_lock_group(sb, e4b->bd_group);
                 }
                 mb_clear_bit(block, EXT4_MB_BITMAP(e4b));
                 e4b->bd_info->bb_counters[order]++;
@@ -1296,13 +1362,20 @@ static void ext4_mb_use_best_found(struct ext4_allocation_context *ac,
         ac->ac_tail = ret & 0xffff;
         ac->ac_buddy = ret >> 16;
 
-        /* XXXXXXX: SUCH A HORRIBLE **CK */
-        /*FIXME!! Why ? */
+        /*
+         * take the page reference. We want the page to be pinned
+         * so that we don't get a ext4_mb_init_cache_call for this
+         * group until we update the bitmap. That would mean we
+         * double allocate blocks. The reference is dropped
+         * in ext4_mb_release_context
+         */
         ac->ac_bitmap_page = e4b->bd_bitmap_page;
         get_page(ac->ac_bitmap_page);
         ac->ac_buddy_page = e4b->bd_buddy_page;
         get_page(ac->ac_buddy_page);
-
+        /* on allocation we use ac to track the held semaphore */
+        ac->alloc_semp =  e4b->alloc_semp;
+        e4b->alloc_semp = NULL;
         /* store last allocated for subsequent stream allocation */
         if ((ac->ac_flags & EXT4_MB_HINT_DATA)) {
                 spin_lock(&sbi->s_md_lock);
@@ -1326,6 +1399,8 @@ static void ext4_mb_check_limits(struct ext4_allocation_context *ac,
         struct ext4_free_extent ex;
         int max;
 
+        if (ac->ac_status == AC_STATUS_FOUND)
+                return;
         /*
          * We don't want to scan for a whole year
          */
@@ -1575,8 +1650,9 @@ static void ext4_mb_complex_scan_group(struct ext4_allocation_context *ac,
                          * free blocks even though group info says we
                          * we have free blocks
                          */
-                        ext4_error(sb, __func__, "%d free blocks as per "
-                                        "group info. But bitmap says 0\n",
+                        ext4_grp_locked_error(sb, e4b->bd_group,
+                                        __func__, "%d free blocks as per "
+                                        "group info. But bitmap says 0",
                                         free);
                         break;
                 }
@@ -1584,8 +1660,9 @@ static void ext4_mb_complex_scan_group(struct ext4_allocation_context *ac,
                 mb_find_extent(e4b, 0, i, ac->ac_g_ex.fe_len, &ex);
                 BUG_ON(ex.fe_len <= 0);
                 if (free < ex.fe_len) {
-                        ext4_error(sb, __func__, "%d free blocks as per "
-                                        "group info. But got %d blocks\n",
+                        ext4_grp_locked_error(sb, e4b->bd_group,
+                                        __func__, "%d free blocks as per "
+                                        "group info. But got %d blocks",
                                         free, ex.fe_len);
                         /*
                          * The number of free blocks differs. This mostly
@@ -1692,6 +1769,173 @@ static int ext4_mb_good_group(struct ext4_allocation_context *ac,
         return 0;
 }
 
+/*
+ * lock the group_info alloc_sem of all the groups
+ * belonging to the same buddy cache page. This
+ * make sure other parallel operation on the buddy
+ * cache doesn't happen  whild holding the buddy cache
+ * lock
+ */
+int ext4_mb_get_buddy_cache_lock(struct super_block *sb, ext4_group_t group)
+{
+        int i;
+        int block, pnum;
+        int blocks_per_page;
+        int groups_per_page;
+        ext4_group_t first_group;
+        struct ext4_group_info *grp;
+
+        blocks_per_page = PAGE_CACHE_SIZE / sb->s_blocksize;
+        /*
+         * the buddy cache inode stores the block bitmap
+         * and buddy information in consecutive blocks.
+         * So for each group we need two blocks.
+         */
+        block = group * 2;
+        pnum = block / blocks_per_page;
+        first_group = pnum * blocks_per_page / 2;
+
+        groups_per_page = blocks_per_page >> 1;
+        if (groups_per_page == 0)
+                groups_per_page = 1;
+        /* read all groups the page covers into the cache */
+        for (i = 0; i < groups_per_page; i++) {
+
+                if ((first_group + i) >= EXT4_SB(sb)->s_groups_count)
+                        break;
+                grp = ext4_get_group_info(sb, first_group + i);
+                /* take all groups write allocation
+                 * semaphore. This make sure there is
+                 * no block allocation going on in any
+                 * of that groups
+                 */
+                down_write_nested(&grp->alloc_sem, i);
+        }
+        return i;
+}
+
+void ext4_mb_put_buddy_cache_lock(struct super_block *sb,
+                                        ext4_group_t group, int locked_group)
+{
+        int i;
+        int block, pnum;
+        int blocks_per_page;
+        ext4_group_t first_group;
+        struct ext4_group_info *grp;
+
+        blocks_per_page = PAGE_CACHE_SIZE / sb->s_blocksize;
+        /*
+         * the buddy cache inode stores the block bitmap
+         * and buddy information in consecutive blocks.
+         * So for each group we need two blocks.
+         */
+        block = group * 2;
+        pnum = block / blocks_per_page;
+        first_group = pnum * blocks_per_page / 2;
+        /* release locks on all the groups */
+        for (i = 0; i < locked_group; i++) {
+
+                grp = ext4_get_group_info(sb, first_group + i);
+                /* take all groups write allocation
+                 * semaphore. This make sure there is
+                 * no block allocation going on in any
+                 * of that groups
+                 */
+                up_write(&grp->alloc_sem);
+        }
+
+}
+
+static int ext4_mb_init_group(struct super_block *sb, ext4_group_t group)
+{
+
+        int ret;
+        void *bitmap;
+        int blocks_per_page;
+        int block, pnum, poff;
+        int num_grp_locked = 0;
+        struct ext4_group_info *this_grp;
+        struct ext4_sb_info *sbi = EXT4_SB(sb);
+        struct inode *inode = sbi->s_buddy_cache;
+        struct page *page = NULL, *bitmap_page = NULL;
+
+        mb_debug("init group %lu\n", group);
+        blocks_per_page = PAGE_CACHE_SIZE / sb->s_blocksize;
+        this_grp = ext4_get_group_info(sb, group);
+        /*
+         * This ensures we don't add group
+         * to this buddy cache via resize
+         */
+        num_grp_locked =  ext4_mb_get_buddy_cache_lock(sb, group);
+        if (!EXT4_MB_GRP_NEED_INIT(this_grp)) {
+                /*
+                 * somebody initialized the group
+                 * return without doing anything
+                 */
+                ret = 0;
+                goto err;
+        }
+        /*
+         * the buddy cache inode stores the block bitmap
+         * and buddy information in consecutive blocks.
+         * So for each group we need two blocks.
+         */
+        block = group * 2;
+        pnum = block / blocks_per_page;
+        poff = block % blocks_per_page;
+        page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS);
+        if (page) {
+                BUG_ON(page->mapping != inode->i_mapping);
+                ret = ext4_mb_init_cache(page, NULL);
+                if (ret) {
+                        unlock_page(page);
+                        goto err;
+                }
+                unlock_page(page);
+        }
+        if (page == NULL || !PageUptodate(page)) {
+                ret = -EIO;
+                goto err;
+        }
+        mark_page_accessed(page);
+        bitmap_page = page;
+        bitmap = page_address(page) + (poff * sb->s_blocksize);
+
+        /* init buddy cache */
+        block++;
+        pnum = block / blocks_per_page;
+        poff = block % blocks_per_page;
+        page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS);
+        if (page == bitmap_page) {
+                /*
+                 * If both the bitmap and buddy are in
+                 * the same page we don't need to force
+                 * init the buddy
+                 */
+                unlock_page(page);
+        } else if (page) {
+                BUG_ON(page->mapping != inode->i_mapping);
+                ret = ext4_mb_init_cache(page, bitmap);
+                if (ret) {
+                        unlock_page(page);
+                        goto err;
+                }
+                unlock_page(page);
+        }
+        if (page == NULL || !PageUptodate(page)) {
+                ret = -EIO;
+                goto err;
+        }
+        mark_page_accessed(page);
+err:
+        ext4_mb_put_buddy_cache_lock(sb, group, num_grp_locked);
+        if (bitmap_page)
+                page_cache_release(bitmap_page);
+        if (page)
+                page_cache_release(page);
+        return ret;
+}
+
 static noinline_for_stack int
 ext4_mb_regular_allocator(struct ext4_allocation_context *ac)
 {
@@ -1775,7 +2019,7 @@ repeat:
                                 group = 0;
 
                         /* quick check to skip empty groups */
-                        grp = ext4_get_group_info(ac->ac_sb, group);
+                        grp = ext4_get_group_info(sb, group);
                         if (grp->bb_free == 0)
                                 continue;
 
@@ -1788,10 +2032,9 @@ repeat:
                                  * we need full data about the group
                                  * to make a good selection
                                  */
-                                err = ext4_mb_load_buddy(sb, group, &e4b);
+                                err = ext4_mb_init_group(sb, group);
                                 if (err)
                                         goto out;
-                                ext4_mb_release_desc(&e4b);
                         }
 
                         /*
@@ -1932,13 +2175,13 @@ static int ext4_mb_seq_history_show(struct seq_file *seq, void *v)
         if (hs->op == EXT4_MB_HISTORY_ALLOC) {
                 fmt = "%-5u %-8u %-23s %-23s %-23s %-5u %-5u %-2u "
                         "%-5u %-5s %-5u %-6u\n";
-                sprintf(buf2, "%lu/%d/%u@%u", hs->result.fe_group,
+                sprintf(buf2, "%u/%d/%u@%u", hs->result.fe_group,
                         hs->result.fe_start, hs->result.fe_len,
                         hs->result.fe_logical);
-                sprintf(buf, "%lu/%d/%u@%u", hs->orig.fe_group,
+                sprintf(buf, "%u/%d/%u@%u", hs->orig.fe_group,
                         hs->orig.fe_start, hs->orig.fe_len,
                         hs->orig.fe_logical);
-                sprintf(buf3, "%lu/%d/%u@%u", hs->goal.fe_group,
+                sprintf(buf3, "%u/%d/%u@%u", hs->goal.fe_group,
                         hs->goal.fe_start, hs->goal.fe_len,
                         hs->goal.fe_logical);
                 seq_printf(seq, fmt, hs->pid, hs->ino, buf, buf3, buf2,
@@ -1947,20 +2190,20 @@ static int ext4_mb_seq_history_show(struct seq_file *seq, void *v)
                                 hs->buddy ? 1 << hs->buddy : 0);
         } else if (hs->op == EXT4_MB_HISTORY_PREALLOC) {
                 fmt = "%-5u %-8u %-23s %-23s %-23s\n";
-                sprintf(buf2, "%lu/%d/%u@%u", hs->result.fe_group,
+                sprintf(buf2, "%u/%d/%u@%u", hs->result.fe_group,
                         hs->result.fe_start, hs->result.fe_len,
                         hs->result.fe_logical);
-                sprintf(buf, "%lu/%d/%u@%u", hs->orig.fe_group,
+                sprintf(buf, "%u/%d/%u@%u", hs->orig.fe_group,
                         hs->orig.fe_start, hs->orig.fe_len,
                         hs->orig.fe_logical);
                 seq_printf(seq, fmt, hs->pid, hs->ino, buf, "", buf2);
         } else if (hs->op == EXT4_MB_HISTORY_DISCARD) {
-                sprintf(buf2, "%lu/%d/%u", hs->result.fe_group,
+                sprintf(buf2, "%u/%d/%u", hs->result.fe_group,
                         hs->result.fe_start, hs->result.fe_len);
                 seq_printf(seq, "%-5u %-8u %-23s discard\n",
                                 hs->pid, hs->ino, buf2);
         } else if (hs->op == EXT4_MB_HISTORY_FREE) {
-                sprintf(buf2, "%lu/%d/%u", hs->result.fe_group,
+                sprintf(buf2, "%u/%d/%u", hs->result.fe_group,
                         hs->result.fe_start, hs->result.fe_len);
                 seq_printf(seq, "%-5u %-8u %-23s free\n",
                                 hs->pid, hs->ino, buf2);
@@ -2073,7 +2316,7 @@ static void *ext4_mb_seq_groups_start(struct seq_file *seq, loff_t *pos)
                 return NULL;
 
         group = *pos + 1;
-        return (void *) group;
+        return (void *) ((unsigned long) group);
 }
 
 static void *ext4_mb_seq_groups_next(struct seq_file *seq, void *v, loff_t *pos)
@@ -2086,13 +2329,13 @@ static void *ext4_mb_seq_groups_next(struct seq_file *seq, void *v, loff_t *pos)
         if (*pos < 0 || *pos >= sbi->s_groups_count)
                 return NULL;
         group = *pos + 1;
-        return (void *) group;;
+        return (void *) ((unsigned long) group);
 }
 
 static int ext4_mb_seq_groups_show(struct seq_file *seq, void *v)
 {
         struct super_block *sb = seq->private;
-        long group = (long) v;
+        ext4_group_t group = (ext4_group_t) ((unsigned long) v);
         int i;
         int err;
         struct ext4_buddy e4b;
@@ -2114,7 +2357,7 @@ static int ext4_mb_seq_groups_show(struct seq_file *seq, void *v)
                 sizeof(struct ext4_group_info);
         err = ext4_mb_load_buddy(sb, group, &e4b);
         if (err) {
-                seq_printf(seq, "#%-5lu: I/O error\n", group);
+                seq_printf(seq, "#%-5u: I/O error\n", group);
                 return 0;
         }
         ext4_lock_group(sb, group);
@@ -2122,7 +2365,7 @@ static int ext4_mb_seq_groups_show(struct seq_file *seq, void *v)
         ext4_unlock_group(sb, group);
         ext4_mb_release_desc(&e4b);
 
-        seq_printf(seq, "#%-5lu: %-5u %-5u %-5u [", group, sg.info.bb_free,
+        seq_printf(seq, "#%-5u: %-5u %-5u %-5u [", group, sg.info.bb_free,
                         sg.info.bb_fragments, sg.info.bb_first_free);
         for (i = 0; i <= 13; i++)
                 seq_printf(seq, " %-5u", i <= sb->s_blocksize_bits + 1 ?
@@ -2296,10 +2539,11 @@ int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group,
                         ext4_free_blocks_after_init(sb, group, desc);
         } else {
                 meta_group_info[i]->bb_free =
-                        le16_to_cpu(desc->bg_free_blocks_count);
+                        ext4_free_blks_count(sb, desc);
         }
 
         INIT_LIST_HEAD(&meta_group_info[i]->bb_prealloc_list);
+        init_rwsem(&meta_group_info[i]->alloc_sem);
         meta_group_info[i]->bb_free_root.rb_node = NULL;;
 
 #ifdef DOUBLE_CHECK
@@ -2327,54 +2571,6 @@ exit_meta_group_info:
 } /* ext4_mb_add_groupinfo */
 
 /*
- * Add a group to the existing groups.
- * This function is used for online resize
- */
-int ext4_mb_add_more_groupinfo(struct super_block *sb, ext4_group_t group,
-                               struct ext4_group_desc *desc)
-{
-        struct ext4_sb_info *sbi = EXT4_SB(sb);
-        struct inode *inode = sbi->s_buddy_cache;
-        int blocks_per_page;
-        int block;
-        int pnum;
-        struct page *page;
-        int err;
-
-        /* Add group based on group descriptor*/
-        err = ext4_mb_add_groupinfo(sb, group, desc);
-        if (err)
-                return err;
-
-        /*
-         * Cache pages containing dynamic mb_alloc datas (buddy and bitmap
-         * datas) are set not up to date so that they will be re-initilaized
-         * during the next call to ext4_mb_load_buddy
-         */
-
-        /* Set buddy page as not up to date */
-        blocks_per_page = PAGE_CACHE_SIZE / sb->s_blocksize;
-        block = group * 2;
-        pnum = block / blocks_per_page;
-        page = find_get_page(inode->i_mapping, pnum);
-        if (page != NULL) {
-                ClearPageUptodate(page);
-                page_cache_release(page);
-        }
-
-        /* Set bitmap page as not up to date */
-        block++;
-        pnum = block / blocks_per_page;
-        page = find_get_page(inode->i_mapping, pnum);
-        if (page != NULL) {
-                ClearPageUptodate(page);
-                page_cache_release(page);
-        }
-
-        return 0;
-}
-
-/*
  * Update an existing group.
  * This function is used for online resize
  */
@@ -2457,7 +2653,7 @@ static int ext4_mb_init_backend(struct super_block *sb)
                 desc = ext4_get_group_desc(sb, i, NULL);
                 if (desc == NULL) {
                         printk(KERN_ERR
-                                "EXT4-fs: can't read descriptor %lu\n", i);
+                                "EXT4-fs: can't read descriptor %u\n", i);
                         goto err_freebuddy;
                 }
                 if (ext4_mb_add_groupinfo(sb, i, desc) != 0)
@@ -2493,6 +2689,8 @@ int ext4_mb_init(struct super_block *sb, int needs_recovery)
         if (sbi->s_mb_offsets == NULL) {
                 return -ENOMEM;
         }
+
+        i = (sb->s_blocksize_bits + 2) * sizeof(unsigned int);
         sbi->s_mb_maxs = kmalloc(i, GFP_KERNEL);
         if (sbi->s_mb_maxs == NULL) {
                 kfree(sbi->s_mb_maxs);
@@ -2551,7 +2749,8 @@ int ext4_mb_init(struct super_block *sb, int needs_recovery)
         ext4_mb_init_per_dev_proc(sb);
         ext4_mb_history_init(sb);
 
-        sbi->s_journal->j_commit_callback = release_blocks_on_commit;
+        if (sbi->s_journal)
+                sbi->s_journal->j_commit_callback = release_blocks_on_commit;
 
         printk(KERN_INFO "EXT4-fs: mballoc enabled\n");
         return 0;
@@ -2652,7 +2851,7 @@ static void release_blocks_on_commit(journal_t *journal, transaction_t *txn)
         list_for_each_safe(l, ltmp, &txn->t_private_list) {
                 entry = list_entry(l, struct ext4_free_data, list);
 
-                mb_debug("gonna free %u blocks in group %lu (0x%p):",
+                mb_debug("gonna free %u blocks in group %u (0x%p):",
                          entry->count, entry->group, entry);
 
                 err = ext4_mb_load_buddy(sb, entry->group, &e4b);
@@ -2679,8 +2878,9 @@ static void release_blocks_on_commit(journal_t *journal, transaction_t *txn)
                 discard_block = (ext4_fsblk_t) entry->group * EXT4_BLOCKS_PER_GROUP(sb)
                         + entry->start_blk
                         + le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
-                trace_mark(ext4_discard_blocks, "dev %s blk %llu count %u", sb->s_id,
-                           (unsigned long long) discard_block, entry->count);
+                trace_mark(ext4_discard_blocks, "dev %s blk %llu count %u",
+                           sb->s_id, (unsigned long long) discard_block,
+                           entry->count);
                 sb_issue_discard(sb, discard_block, entry->count);
 
                 kmem_cache_free(ext4_free_ext_cachep, entry);
@@ -2791,7 +2991,7 @@ void exit_ext4_mballoc(void)
  */
 static noinline_for_stack int
 ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
-                                handle_t *handle, unsigned long reserv_blks)
+                                handle_t *handle, unsigned int reserv_blks)
 {
         struct buffer_head *bitmap_bh = NULL;
         struct ext4_super_block *es;
@@ -2824,7 +3024,7 @@ ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
         if (!gdp)
                 goto out_err;
 
-        ext4_debug("using block group %lu(%d)\n", ac->ac_b_ex.fe_group,
+        ext4_debug("using block group %u(%d)\n", ac->ac_b_ex.fe_group,
                         gdp->bg_free_blocks_count);
 
         err = ext4_journal_get_write_access(handle, gdp_bh);
@@ -2843,8 +3043,8 @@ ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
             in_range(block + len - 1, ext4_inode_table(sb, gdp),
                      EXT4_SB(sb)->s_itb_per_group)) {
                 ext4_error(sb, __func__,
-                           "Allocating block in system zone - block = %llu",
-                           block);
+                           "Allocating block %llu in system zone of %d group\n",
+                           block, ac->ac_b_ex.fe_group);
                 /* File system mounted not to panic on error
                  * Fix the bitmap and repeat the block allocation
                  * We leak some of the blocks here.
@@ -2852,7 +3052,7 @@ ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
                 mb_set_bits(sb_bgl_lock(sbi, ac->ac_b_ex.fe_group),
                                 bitmap_bh->b_data, ac->ac_b_ex.fe_start,
                                 ac->ac_b_ex.fe_len);
-                err = ext4_journal_dirty_metadata(handle, bitmap_bh);
+                err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh);
                 if (!err)
                         err = -EAGAIN;
                 goto out_err;
@@ -2866,18 +3066,17 @@ ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
                 }
         }
 #endif
-        mb_set_bits(sb_bgl_lock(sbi, ac->ac_b_ex.fe_group), bitmap_bh->b_data,
-                                ac->ac_b_ex.fe_start, ac->ac_b_ex.fe_len);
-
         spin_lock(sb_bgl_lock(sbi, ac->ac_b_ex.fe_group));
+        mb_set_bits(NULL, bitmap_bh->b_data,
+                                ac->ac_b_ex.fe_start, ac->ac_b_ex.fe_len);
         if (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
                 gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT);
-                gdp->bg_free_blocks_count =
-                        cpu_to_le16(ext4_free_blocks_after_init(sb,
-                                                ac->ac_b_ex.fe_group,
-                                                gdp));
+                ext4_free_blks_set(sb, gdp,
+                                        ext4_free_blocks_after_init(sb,
+                                        ac->ac_b_ex.fe_group, gdp));
         }
-        le16_add_cpu(&gdp->bg_free_blocks_count, -ac->ac_b_ex.fe_len);
+        len = ext4_free_blks_count(sb, gdp) - ac->ac_b_ex.fe_len;
+        ext4_free_blks_set(sb, gdp, len);
         gdp->bg_checksum = ext4_group_desc_csum(sbi, ac->ac_b_ex.fe_group, gdp);
         spin_unlock(sb_bgl_lock(sbi, ac->ac_b_ex.fe_group));
         percpu_counter_sub(&sbi->s_freeblocks_counter, ac->ac_b_ex.fe_len);
@@ -2899,10 +3098,10 @@ ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
                 spin_unlock(sb_bgl_lock(sbi, flex_group));
         }
 
-        err = ext4_journal_dirty_metadata(handle, bitmap_bh);
+        err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh);
         if (err)
                 goto out_err;
-        err = ext4_journal_dirty_metadata(handle, gdp_bh);
+        err = ext4_handle_dirty_metadata(handle, NULL, gdp_bh);
 
 out_err:
         sb->s_dirt = 1;
@@ -3031,7 +3230,7 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac,
         /* check we don't cross already preallocated blocks */
         rcu_read_lock();
         list_for_each_entry_rcu(pa, &ei->i_prealloc_list, pa_inode_list) {
-                unsigned long pa_end;
+                ext4_lblk_t pa_end;
 
                 if (pa->pa_deleted)
                         continue;
@@ -3075,7 +3274,7 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac,
         /* XXX: extra loop to check we really don't overlap preallocations */
         rcu_read_lock();
         list_for_each_entry_rcu(pa, &ei->i_prealloc_list, pa_inode_list) {
-                unsigned long pa_end;
+                ext4_lblk_t pa_end;
                 spin_lock(&pa->pa_lock);
                 if (pa->pa_deleted == 0) {
                         pa_end = pa->pa_lstart + pa->pa_len;
@@ -3307,6 +3506,32 @@ ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
 }
 
 /*
+ * the function goes through all block freed in the group
+ * but not yet committed and marks them used in in-core bitmap.
+ * buddy must be generated from this bitmap
+ * Need to be called with ext4 group lock (ext4_lock_group)
+ */
+static void ext4_mb_generate_from_freelist(struct super_block *sb, void *bitmap,
+                                                ext4_group_t group)
+{
+        struct rb_node *n;
+        struct ext4_group_info *grp;
+        struct ext4_free_data *entry;
+
+        grp = ext4_get_group_info(sb, group);
+        n = rb_first(&(grp->bb_free_root));
+
+        while (n) {
+                entry = rb_entry(n, struct ext4_free_data, node);
+                mb_set_bits(sb_bgl_lock(EXT4_SB(sb), group),
+                                bitmap, entry->start_blk,
+                                entry->count);
+                n = rb_next(n);
+        }
+        return;
+}
+
+/*
  * the function goes through all preallocation in this group and marks them
  * used in in-core bitmap. buddy must be generated from this bitmap
  * Need to be called with ext4 group lock (ext4_lock_group)
@@ -3346,7 +3571,7 @@ static void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap,
                 preallocated += len;
                 count++;
         }
-        mb_debug("prellocated %u for group %lu\n", preallocated, group);
+        mb_debug("prellocated %u for group %u\n", preallocated, group);
 }
 
 static void ext4_mb_pa_callback(struct rcu_head *head)
@@ -3363,7 +3588,7 @@ static void ext4_mb_pa_callback(struct rcu_head *head)
 static void ext4_mb_put_pa(struct ext4_allocation_context *ac,
                         struct super_block *sb, struct ext4_prealloc_space *pa)
 {
-        unsigned long grp;
+        ext4_group_t grp;
 
         if (!atomic_dec_and_test(&pa->pa_count) || pa->pa_free != 0)
                 return;
@@ -3473,6 +3698,10 @@ ext4_mb_new_inode_pa(struct ext4_allocation_context *ac)
 
         mb_debug("new inode pa %p: %llu/%u for %u\n", pa,
                         pa->pa_pstart, pa->pa_len, pa->pa_lstart);
+        trace_mark(ext4_mb_new_inode_pa,
+                   "dev %s ino %lu pstart %llu len %u lstart %u",
+                   sb->s_id, ac->ac_inode->i_ino,
+                   pa->pa_pstart, pa->pa_len, pa->pa_lstart);
 
         ext4_mb_use_inode_pa(ac, pa);
         atomic_add(pa->pa_free, &EXT4_SB(sb)->s_mb_preallocated);
@@ -3530,7 +3759,9 @@ ext4_mb_new_group_pa(struct ext4_allocation_context *ac)
         pa->pa_linear = 1;
 
         mb_debug("new group pa %p: %llu/%u for %u\n", pa,
-                        pa->pa_pstart, pa->pa_len, pa->pa_lstart);
+                 pa->pa_pstart, pa->pa_len, pa->pa_lstart);
+        trace_mark(ext4_mb_new_group_pa, "dev %s pstart %llu len %u lstart %u",
+                   sb->s_id, pa->pa_pstart, pa->pa_len, pa->pa_lstart);
 
         ext4_mb_use_group_pa(ac, pa);
         atomic_add(pa->pa_free, &EXT4_SB(sb)->s_mb_preallocated);
@@ -3579,16 +3810,18 @@ ext4_mb_release_inode_pa(struct ext4_buddy *e4b, struct buffer_head *bitmap_bh,
 {
         struct super_block *sb = e4b->bd_sb;
         struct ext4_sb_info *sbi = EXT4_SB(sb);
-        unsigned long end;
-        unsigned long next;
+        unsigned int end;
+        unsigned int next;
         ext4_group_t group;
         ext4_grpblk_t bit;
+        unsigned long long grp_blk_start;
         sector_t start;
         int err = 0;
         int free = 0;
 
         BUG_ON(pa->pa_deleted == 0);
         ext4_get_group_no_and_offset(sb, pa->pa_pstart, &group, &bit);
+        grp_blk_start = pa->pa_pstart - bit;
         BUG_ON(group != e4b->bd_group && pa->pa_len != 0);
         end = bit + pa->pa_len;
 
@@ -3618,6 +3851,10 @@ ext4_mb_release_inode_pa(struct ext4_buddy *e4b, struct buffer_head *bitmap_bh,
                         ext4_mb_store_history(ac);
                 }
 
+                trace_mark(ext4_mb_release_inode_pa,
+                           "dev %s ino %lu block %llu count %u",
+                           sb->s_id, pa->pa_inode->i_ino, grp_blk_start + bit,
+                           next - bit);
                 mb_free_blocks(pa->pa_inode, e4b, bit, next - bit);
                 bit = next + 1;
         }
@@ -3626,8 +3863,9 @@ ext4_mb_release_inode_pa(struct ext4_buddy *e4b, struct buffer_head *bitmap_bh,
                         pa, (unsigned long) pa->pa_lstart,
                         (unsigned long) pa->pa_pstart,
                         (unsigned long) pa->pa_len);
-                ext4_error(sb, __func__, "free %u, pa_free %u\n",
-                                                free, pa->pa_free);
+                ext4_grp_locked_error(sb, group,
+                                        __func__, "free %u, pa_free %u",
+                                        free, pa->pa_free);
                 /*
                  * pa is already deleted so we use the value obtained
                  * from the bitmap and continue.
@@ -3650,6 +3888,8 @@ ext4_mb_release_group_pa(struct ext4_buddy *e4b,
         if (ac)
                 ac->ac_op = EXT4_MB_HISTORY_DISCARD;
 
+        trace_mark(ext4_mb_release_group_pa, "dev %s pstart %llu len %d",
+                   sb->s_id, pa->pa_pstart, pa->pa_len);
         BUG_ON(pa->pa_deleted == 0);
         ext4_get_group_no_and_offset(sb, pa->pa_pstart, &group, &bit);
         BUG_ON(group != e4b->bd_group && pa->pa_len != 0);
@@ -3692,7 +3932,7 @@ ext4_mb_discard_group_preallocations(struct super_block *sb,
         int busy = 0;
         int free = 0;
 
-        mb_debug("discard preallocation for group %lu\n", group);
+        mb_debug("discard preallocation for group %u\n", group);
 
         if (list_empty(&grp->bb_prealloc_list))
                 return 0;
@@ -3700,14 +3940,14 @@ ext4_mb_discard_group_preallocations(struct super_block *sb,
         bitmap_bh = ext4_read_block_bitmap(sb, group);
         if (bitmap_bh == NULL) {
                 ext4_error(sb, __func__, "Error in reading block "
-                                "bitmap for %lu\n", group);
+                                "bitmap for %u", group);
                 return 0;
         }
 
         err = ext4_mb_load_buddy(sb, group, &e4b);
         if (err) {
                 ext4_error(sb, __func__, "Error in loading buddy "
-                                "information for %lu\n", group);
+                                "information for %u", group);
                 put_bh(bitmap_bh);
                 return 0;
         }
@@ -3815,6 +4055,8 @@ void ext4_discard_preallocations(struct inode *inode)
         }
 
         mb_debug("discard preallocation for inode %lu\n", inode->i_ino);
+        trace_mark(ext4_discard_preallocations, "dev %s ino %lu", sb->s_id,
+                   inode->i_ino);
 
         INIT_LIST_HEAD(&list);
 
@@ -3874,14 +4116,14 @@ repeat:
                 err = ext4_mb_load_buddy(sb, group, &e4b);
                 if (err) {
                         ext4_error(sb, __func__, "Error in loading buddy "
-                                        "information for %lu\n", group);
+                                        "information for %u", group);
                         continue;
                 }
 
                 bitmap_bh = ext4_read_block_bitmap(sb, group);
                 if (bitmap_bh == NULL) {
                         ext4_error(sb, __func__, "Error in reading block "
-                                        "bitmap for %lu\n", group);
+                                        "bitmap for %u", group);
                         ext4_mb_release_desc(&e4b);
                         continue;
                 }
@@ -4024,8 +4266,8 @@ ext4_mb_initialize_context(struct ext4_allocation_context *ac,
         struct ext4_sb_info *sbi = EXT4_SB(sb);
         struct ext4_super_block *es = sbi->s_es;
         ext4_group_t group;
-        unsigned long len;
-        unsigned long goal;
+        unsigned int len;
+        ext4_fsblk_t goal;
         ext4_grpblk_t block;
 
         /* we can't allocate > group size */
@@ -4068,6 +4310,7 @@ ext4_mb_initialize_context(struct ext4_allocation_context *ac,
         ac->ac_pa = NULL;
         ac->ac_bitmap_page = NULL;
         ac->ac_buddy_page = NULL;
+        ac->alloc_semp = NULL;
         ac->ac_lg = NULL;
 
         /* we have to define context: we'll we work with a file or
@@ -4146,7 +4389,7 @@ ext4_mb_discard_lg_preallocations(struct super_block *sb,
                 ext4_get_group_no_and_offset(sb, pa->pa_pstart, &group, NULL);
                 if (ext4_mb_load_buddy(sb, group, &e4b)) {
                         ext4_error(sb, __func__, "Error in loading buddy "
-                                        "information for %lu\n", group);
+                                        "information for %u", group);
                         continue;
                 }
                 ext4_lock_group(sb, group);
@@ -4248,6 +4491,8 @@ static int ext4_mb_release_context(struct ext4_allocation_context *ac)
                 }
                 ext4_mb_put_pa(ac, ac->ac_sb, pa);
         }
+        if (ac->alloc_semp)
+                up_read(ac->alloc_semp);
         if (ac->ac_bitmap_page)
                 page_cache_release(ac->ac_bitmap_page);
         if (ac->ac_buddy_page)
@@ -4264,6 +4509,8 @@ static int ext4_mb_discard_preallocations(struct super_block *sb, int needed)
         int ret;
         int freed = 0;
 
+        trace_mark(ext4_mb_discard_preallocations, "dev %s needed %d",
+                   sb->s_id, needed);
         for (i = 0; i < EXT4_SB(sb)->s_groups_count && needed > 0; i++) {
                 ret = ext4_mb_discard_group_preallocations(sb, i, needed);
                 freed += ret;
@@ -4286,12 +4533,24 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
         struct ext4_sb_info *sbi;
         struct super_block *sb;
         ext4_fsblk_t block = 0;
-        unsigned long inquota;
-        unsigned long reserv_blks = 0;
+        unsigned int inquota;
+        unsigned int reserv_blks = 0;
 
         sb = ar->inode->i_sb;
         sbi = EXT4_SB(sb);
 
+        trace_mark(ext4_request_blocks, "dev %s flags %u len %u ino %lu "
+                   "lblk %llu goal %llu lleft %llu lright %llu "
+                   "pleft %llu pright %llu ",
+                   sb->s_id, ar->flags, ar->len,
+                   ar->inode ? ar->inode->i_ino : 0,
+                   (unsigned long long) ar->logical,
+                   (unsigned long long) ar->goal,
+                   (unsigned long long) ar->lleft,
+                   (unsigned long long) ar->lright,
+                   (unsigned long long) ar->pleft,
+                   (unsigned long long) ar->pright);
+
         if (!EXT4_I(ar->inode)->i_delalloc_reserved_flag) {
                 /*
                  * With delalloc we already reserved the blocks
@@ -4313,7 +4572,7 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
         }
         if (ar->len == 0) {
                 *errp = -EDQUOT;
-                return 0;
+                goto out3;
         }
         inquota = ar->len;
 
@@ -4348,10 +4607,14 @@ repeat:
                                 ac->ac_o_ex.fe_len < ac->ac_b_ex.fe_len)
                         ext4_mb_new_preallocation(ac);
         }
-
         if (likely(ac->ac_status == AC_STATUS_FOUND)) {
                 *errp = ext4_mb_mark_diskspace_used(ac, handle, reserv_blks);
                 if (*errp ==  -EAGAIN) {
+                        /*
+                         * drop the reference that we took
+                         * in ext4_mb_use_best_found
+                         */
+                        ext4_mb_release_context(ac);
                         ac->ac_b_ex.fe_group = 0;
                         ac->ac_b_ex.fe_start = 0;
                         ac->ac_b_ex.fe_len = 0;
@@ -4382,6 +4645,26 @@ out2:
 out1:
         if (ar->len < inquota)
                 DQUOT_FREE_BLOCK(ar->inode, inquota - ar->len);
+out3:
+        if (!ar->len) {
+                if (!EXT4_I(ar->inode)->i_delalloc_reserved_flag)
+                        /* release all the reserved blocks if non delalloc */
+                        percpu_counter_sub(&sbi->s_dirtyblocks_counter,
+                                                reserv_blks);
+        }
+
+        trace_mark(ext4_allocate_blocks,
+                   "dev %s block %llu flags %u len %u ino %lu "
+                   "logical %llu goal %llu lleft %llu lright %llu "
+                   "pleft %llu pright %llu ",
+                   sb->s_id, (unsigned long long) block,
+                   ar->flags, ar->len, ar->inode ? ar->inode->i_ino : 0,
+                   (unsigned long long) ar->logical,
+                   (unsigned long long) ar->goal,
+                   (unsigned long long) ar->lleft,
+                   (unsigned long long) ar->lright,
+                   (unsigned long long) ar->pleft,
+                   (unsigned long long) ar->pright);
 
         return block;
 }
@@ -4403,27 +4686,23 @@ static int can_merge(struct ext4_free_data *entry1,
 
 static noinline_for_stack int
 ext4_mb_free_metadata(handle_t *handle, struct ext4_buddy *e4b,
-                          ext4_group_t group, ext4_grpblk_t block, int count)
+                      struct ext4_free_data *new_entry)
 {
+        ext4_grpblk_t block;
+        struct ext4_free_data *entry;
         struct ext4_group_info *db = e4b->bd_info;
         struct super_block *sb = e4b->bd_sb;
         struct ext4_sb_info *sbi = EXT4_SB(sb);
-        struct ext4_free_data *entry, *new_entry;
         struct rb_node **n = &db->bb_free_root.rb_node, *node;
         struct rb_node *parent = NULL, *new_node;
 
-
+        BUG_ON(!ext4_handle_valid(handle));
         BUG_ON(e4b->bd_bitmap_page == NULL);
         BUG_ON(e4b->bd_buddy_page == NULL);
 
-        new_entry  = kmem_cache_alloc(ext4_free_ext_cachep, GFP_NOFS);
-        new_entry->start_blk = block;
-        new_entry->group  = group;
-        new_entry->count = count;
-        new_entry->t_tid = handle->h_transaction->t_tid;
         new_node = &new_entry->node;
+        block = new_entry->start_blk;
 
-        ext4_lock_group(sb, group);
         if (!*n) {
                 /* first free block exent. We need to
                    protect buddy cache from being freed,
@@ -4441,10 +4720,9 @@ ext4_mb_free_metadata(handle_t *handle, struct ext4_buddy *e4b,
                 else if (block >= (entry->start_blk + entry->count))
                         n = &(*n)->rb_right;
                 else {
-                        ext4_unlock_group(sb, group);
-                        ext4_error(sb, __func__,
-                            "Double free of blocks %d (%d %d)\n",
-                            block, entry->start_blk, entry->count);
+                        ext4_grp_locked_error(sb, e4b->bd_group, __func__,
+                                        "Double free of blocks %d (%d %d)",
+                                        block, entry->start_blk, entry->count);
                         return 0;
                 }
         }
@@ -4483,7 +4761,6 @@ ext4_mb_free_metadata(handle_t *handle, struct ext4_buddy *e4b,
         spin_lock(&sbi->s_md_lock);
         list_add(&new_entry->list, &handle->h_transaction->t_private_list);
         spin_unlock(&sbi->s_md_lock);
-        ext4_unlock_group(sb, group);
         return 0;
 }
 
@@ -4499,7 +4776,7 @@ void ext4_mb_free_blocks(handle_t *handle, struct inode *inode,
         struct ext4_allocation_context *ac = NULL;
         struct ext4_group_desc *gdp;
         struct ext4_super_block *es;
-        unsigned long overflow;
+        unsigned int overflow;
         ext4_grpblk_t bit;
         struct buffer_head *gd_bh;
         ext4_group_t block_group;
@@ -4522,6 +4799,10 @@ void ext4_mb_free_blocks(handle_t *handle, struct inode *inode,
         }
 
         ext4_debug("freeing block %lu\n", block);
+        trace_mark(ext4_free_blocks,
+                   "dev %s block %llu count %lu metadata %d ino %lu",
+                   sb->s_id, (unsigned long long) block, count, metadata,
+                   inode ? inode->i_ino : 0);
 
         ac = kmem_cache_alloc(ext4_ac_cachep, GFP_NOFS);
         if (ac) {
@@ -4581,11 +4862,6 @@ do_more:
         err = ext4_journal_get_write_access(handle, gd_bh);
         if (err)
                 goto error_return;
-
-        err = ext4_mb_load_buddy(sb, block_group, &e4b);
-        if (err)
-                goto error_return;
-
 #ifdef AGGRESSIVE_CHECK
         {
                 int i;
@@ -4593,13 +4869,6 @@ do_more:
                         BUG_ON(!mb_test_bit(bit + i, bitmap_bh->b_data));
         }
 #endif
-        mb_clear_bits(sb_bgl_lock(sbi, block_group), bitmap_bh->b_data,
-                        bit, count);
-
-        /* We dirtied the bitmap block */
-        BUFFER_TRACE(bitmap_bh, "dirtied bitmap block");
-        err = ext4_journal_dirty_metadata(handle, bitmap_bh);
-
         if (ac) {
                 ac->ac_b_ex.fe_group = block_group;
                 ac->ac_b_ex.fe_start = bit;
@@ -4607,19 +4876,41 @@ do_more:
                 ext4_mb_store_history(ac);
         }
 
-        if (metadata) {
-                /* blocks being freed are metadata. these blocks shouldn't
-                 * be used until this transaction is committed */
-                ext4_mb_free_metadata(handle, &e4b, block_group, bit, count);
+        err = ext4_mb_load_buddy(sb, block_group, &e4b);
+        if (err)
+                goto error_return;
+        if (metadata && ext4_handle_valid(handle)) {
+                struct ext4_free_data *new_entry;
+                /*
+                 * blocks being freed are metadata. these blocks shouldn't
+                 * be used until this transaction is committed
+                 */
+                new_entry  = kmem_cache_alloc(ext4_free_ext_cachep, GFP_NOFS);
+                new_entry->start_blk = bit;
+                new_entry->group  = block_group;
+                new_entry->count = count;
+                new_entry->t_tid = handle->h_transaction->t_tid;
+                ext4_lock_group(sb, block_group);
+                mb_clear_bits(sb_bgl_lock(sbi, block_group), bitmap_bh->b_data,
+                                bit, count);
+                ext4_mb_free_metadata(handle, &e4b, new_entry);
+                ext4_unlock_group(sb, block_group);
         } else {
                 ext4_lock_group(sb, block_group);
+                /* need to update group_info->bb_free and bitmap
+                 * with group lock held. generate_buddy look at
+                 * them with group lock_held
+                 */
+                mb_clear_bits(sb_bgl_lock(sbi, block_group), bitmap_bh->b_data,
+                                bit, count);
                 mb_free_blocks(inode, &e4b, bit, count);
                 ext4_mb_return_to_preallocation(inode, &e4b, block, count);
                 ext4_unlock_group(sb, block_group);
         }
 
         spin_lock(sb_bgl_lock(sbi, block_group));
-        le16_add_cpu(&gdp->bg_free_blocks_count, count);
+        ret = ext4_free_blks_count(sb, gdp) + count;
+        ext4_free_blks_set(sb, gdp, ret);
         gdp->bg_checksum = ext4_group_desc_csum(sbi, block_group, gdp);
         spin_unlock(sb_bgl_lock(sbi, block_group));
         percpu_counter_add(&sbi->s_freeblocks_counter, count);
@@ -4635,9 +4926,13 @@ do_more:
 
         *freed += count;
 
+        /* We dirtied the bitmap block */
+        BUFFER_TRACE(bitmap_bh, "dirtied bitmap block");
+        err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh);
+
         /* And the group descriptor block */
         BUFFER_TRACE(gd_bh, "dirtied group descriptor block");
-        ret = ext4_journal_dirty_metadata(handle, gd_bh);
+        ret = ext4_handle_dirty_metadata(handle, NULL, gd_bh);
         if (!err)
                 err = ret;