From 1f152c64f52b9ceba86377f2fe3146885e45c3f3 Mon Sep 17 00:00:00 2001
From: yangsheng <yangsheng>
Date: Thu, 6 Dec 2007 10:57:38 +0000
Subject: [PATCH] *** empty log message ***
---
.../ext3-mballoc3-core-2.6.22-vanilla.patch | 4590 -----------------
1 file changed, 4590 deletions(-)
delete mode 100644 ldiskfs/kernel_patches/patches/ext3-mballoc3-core-2.6.22-vanilla.patch
diff --git a/ldiskfs/kernel_patches/patches/ext3-mballoc3-core-2.6.22-vanilla.patch b/ldiskfs/kernel_patches/patches/ext3-mballoc3-core-2.6.22-vanilla.patch
deleted file mode 100644
index 93e3c949ea..0000000000
--- a/ldiskfs/kernel_patches/patches/ext3-mballoc3-core-2.6.22-vanilla.patch
+++ /dev/null
@@ -1,4590 +0,0 @@
-Index: linux-2.6.9-full/include/linux/ext3_fs.h
-===================================================================
---- linux-2.6.9-full.orig/include/linux/ext3_fs.h 2007-06-08 23:44:08.000000000 +0400
-+++ linux-2.6.9-full/include/linux/ext3_fs.h 2007-10-17 22:25:01.000000000 +0400
-@@ -57,6 +57,30 @@ struct statfs;
- #define ext3_debug(f, a...) do {} while (0)
- #endif
-
-+#define EXT3_MULTIBLOCK_ALLOCATOR 1
-+
-+#define EXT3_MB_HINT_MERGE 1 /* prefer goal again. length */
-+#define EXT3_MB_HINT_RESERVED 2 /* blocks already reserved */
-+#define EXT3_MB_HINT_METADATA 4 /* metadata is being allocated */
-+#define EXT3_MB_HINT_FIRST 8 /* first blocks in the file */
-+#define EXT3_MB_HINT_BEST 16 /* search for the best chunk */
-+#define EXT3_MB_HINT_DATA 32 /* data is being allocated */
-+#define EXT3_MB_HINT_NOPREALLOC 64 /* don't preallocate (for tails) */
-+#define EXT3_MB_HINT_GROUP_ALLOC 128 /* allocate for locality group */
-+#define EXT3_MB_HINT_GOAL_ONLY 256 /* allocate goal blocks or none */
-+
-+struct ext3_allocation_request {
-+ struct inode *inode; /* target inode for block we're allocating */
-+ unsigned long logical; /* logical block in target inode */
-+ unsigned long goal; /* phys. target (a hint) */
-+ unsigned long lleft; /* the closest logical allocated block to the left */
-+ unsigned long pleft; /* phys. block for ^^^ */
-+ unsigned long lright; /* the closest logical allocated block to the right */
-+ unsigned long pright; /* phys. block for ^^^ */
-+ unsigned long len; /* how many blocks we want to allocate */
-+ unsigned long flags; /* flags. see above EXT3_MB_HINT_* */
-+};
-+
- /*
- * Special inodes numbers
- */
-@@ -387,6 +411,14 @@ struct ext3_inode {
- #define ext3_find_first_zero_bit ext2_find_first_zero_bit
- #define ext3_find_next_zero_bit ext2_find_next_zero_bit
-
-+#ifndef ext2_find_next_le_bit
-+#ifdef __LITTLE_ENDIAN
-+#define ext2_find_next_le_bit(addr, size, off) find_next_bit((addr), (size), (off))
-+#else
-+#error "mballoc needs a patch for big-endian systems - CFS bug 10634"
-+#endif /* __LITTLE_ENDIAN */
-+#endif /* !ext2_find_next_le_bit */
-+
- /*
- * Maximal mount counts between two filesystem checks
- */
-@@ -763,6 +795,20 @@ extern unsigned long ext3_count_dirs (st
- extern void ext3_check_inodes_bitmap (struct super_block *);
- extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
-
-+/* mballoc.c */
-+extern long ext3_mb_stats;
-+extern long ext3_mb_max_to_scan;
-+extern int ext3_mb_init(struct super_block *, int);
-+extern int ext3_mb_release(struct super_block *);
-+extern unsigned long ext3_mb_new_blocks(handle_t *, struct ext3_allocation_request *, int *);
-+extern int ext3_mb_reserve_blocks(struct super_block *, int);
-+extern void ext3_mb_release_blocks(struct super_block *, int);
-+extern void ext3_mb_release_blocks(struct super_block *, int);
-+extern void ext3_mb_discard_inode_preallocations(struct inode *);
-+extern int __init init_ext3_proc(void);
-+extern void exit_ext3_proc(void);
-+extern void ext3_mb_free_blocks(handle_t *, struct inode *, unsigned long, unsigned long, int, int *);
-+
-
- /* inode.c */
- extern int ext3_block_truncate_page(handle_t *, struct page *,
-Index: linux-2.6.9-full/include/linux/ext3_fs_sb.h
-===================================================================
---- linux-2.6.9-full.orig/include/linux/ext3_fs_sb.h 2007-06-08 23:44:07.000000000 +0400
-+++ linux-2.6.9-full/include/linux/ext3_fs_sb.h 2007-10-17 22:25:01.000000000 +0400
-@@ -81,6 +81,61 @@ struct ext3_sb_info {
- char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
- int s_jquota_fmt; /* Format of quota to use */
- #endif
-+
-+ /* for buddy allocator */
-+ struct ext3_group_info ***s_group_info;
-+ struct inode *s_buddy_cache;
-+ long s_blocks_reserved;
-+ spinlock_t s_reserve_lock;
-+ struct list_head s_active_transaction;
-+ struct list_head s_closed_transaction;
-+ struct list_head s_committed_transaction;
-+ spinlock_t s_md_lock;
-+ tid_t s_last_transaction;
-+ unsigned short *s_mb_offsets, *s_mb_maxs;
-+
-+ /* tunables */
-+ unsigned long s_mb_factor;
-+ unsigned long s_stripe;
-+ unsigned long s_mb_stream_request;
-+ unsigned long s_mb_max_to_scan;
-+ unsigned long s_mb_min_to_scan;
-+ unsigned long s_mb_max_groups_to_scan;
-+ unsigned long s_mb_stats;
-+ unsigned long s_mb_order2_reqs;
-+
-+ /* history to debug policy */
-+ struct ext3_mb_history *s_mb_history;
-+ int s_mb_history_cur;
-+ int s_mb_history_max;
-+ int s_mb_history_num;
-+ struct proc_dir_entry *s_mb_proc;
-+ spinlock_t s_mb_history_lock;
-+ int s_mb_history_filter;
-+
-+ /* stats for buddy allocator */
-+ spinlock_t s_mb_pa_lock;
-+ atomic_t s_bal_reqs; /* number of reqs with len > 1 */
-+ atomic_t s_bal_success; /* we found long enough chunks */
-+ atomic_t s_bal_allocated; /* in blocks */
-+ atomic_t s_bal_ex_scanned; /* total extents scanned */
-+ atomic_t s_bal_goals; /* goal hits */
-+ atomic_t s_bal_breaks; /* too long searches */
-+ atomic_t s_bal_2orders; /* 2^order hits */
-+ spinlock_t s_bal_lock;
-+ unsigned long s_mb_buddies_generated;
-+ unsigned long long s_mb_generation_time;
-+ atomic_t s_mb_lost_chunks;
-+ atomic_t s_mb_preallocated;
-+ atomic_t s_mb_discarded;
-+
-+ /* locality groups */
-+ struct ext3_locality_group *s_locality_groups;
-+
- };
-
-+#define EXT3_GROUP_INFO(sb, group) \
-+ EXT3_SB(sb)->s_group_info[(group) >> EXT3_DESC_PER_BLOCK_BITS(sb)] \
-+ [(group) & (EXT3_DESC_PER_BLOCK(sb) - 1)]
-+
- #endif /* _LINUX_EXT3_FS_SB */
-Index: linux-2.6.9-full/fs/ext3/super.c
-===================================================================
---- linux-2.6.9-full.orig/fs/ext3/super.c 2007-06-08 23:44:08.000000000 +0400
-+++ linux-2.6.9-full/fs/ext3/super.c 2007-10-17 22:26:27.000000000 +0400
-@@ -394,6 +394,7 @@ void ext3_put_super (struct super_block
- struct ext3_super_block *es = sbi->s_es;
- int i;
-
-+ ext3_mb_release(sb);
- ext3_ext_release(sb);
- ext3_xattr_put_super(sb);
- journal_destroy(sbi->s_journal);
-@@ -463,6 +464,8 @@ static struct inode *ext3_alloc_inode(st
- ei->vfs_inode.i_version = 1;
-
- memset(&ei->i_cached_extent, 0, sizeof(ei->i_cached_extent));
-+ INIT_LIST_HEAD(&ei->i_prealloc_list);
-+ spin_lock_init(&ei->i_prealloc_lock);
- return &ei->vfs_inode;
- }
-
-@@ -2576,7 +2579,13 @@ static struct file_system_type ext3_fs_t
-
- static int __init init_ext3_fs(void)
- {
-- int err = init_ext3_xattr();
-+ int err;
-+
-+ err = init_ext3_proc();
-+ if (err)
-+ return err;
-+
-+ err = init_ext3_xattr();
- if (err)
- return err;
- err = init_inodecache();
-@@ -2598,6 +2607,7 @@ static void __exit exit_ext3_fs(void)
- unregister_filesystem(&ext3_fs_type);
- destroy_inodecache();
- exit_ext3_xattr();
-+ exit_ext3_proc();
- }
-
- int ext3_prep_san_write(struct inode *inode, long *blocks,
-Index: linux-2.6.9-full/fs/ext3/mballoc.c
-===================================================================
---- linux-2.6.9-full.orig/fs/ext3/mballoc.c 2007-10-17 21:59:51.072534980 +0400
-+++ linux-2.6.9-full/fs/ext3/mballoc.c 2007-10-17 23:09:22.000000000 +0400
-@@ -0,0 +1,4404 @@
-+/*
-+ * Copyright (c) 2003-2006, Cluster File Systems, Inc, info@clusterfs.com
-+ * Written by Alex Tomas <alex@clusterfs.com>
-+ *
-+ * This program is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License version 2 as
-+ * published by the Free Software Foundation.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public Licens
-+ * along with this program; if not, write to the Free Software
-+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-
-+ */
-+
-+
-+/*
-+ * mballoc.c contains the multiblocks allocation routines
-+ */
-+
-+#include <linux/time.h>
-+#include <linux/fs.h>
-+#include <linux/namei.h>
-+#include <linux/ext3_jbd.h>
-+#include <linux/jbd.h>
-+#include <linux/ext3_fs.h>
-+#include <linux/quotaops.h>
-+#include <linux/buffer_head.h>
-+#include <linux/module.h>
-+#include <linux/swap.h>
-+#include <linux/proc_fs.h>
-+#include <linux/pagemap.h>
-+#include <linux/seq_file.h>
-+#include <linux/version.h>
-+
-+/*
-+ * MUSTDO:
-+ * - test ext3_ext_search_left() and ext3_ext_search_right()
-+ * - search for metadata in few groups
-+ *
-+ * TODO v4:
-+ * - normalization should take into account whether file is still open
-+ * - discard preallocations if no free space left (policy?)
-+ * - don't normalize tails
-+ * - quota
-+ * - reservation for superuser
-+ *
-+ * TODO v3:
-+ * - bitmap read-ahead (proposed by Oleg Drokin aka green)
-+ * - track min/max extents in each group for better group selection
-+ * - mb_mark_used() may allocate chunk right after splitting buddy
-+ * - tree of groups sorted by number of free blocks
-+ * - error handling
-+ */
-+
-+/*
-+ * mballoc operates on the following data:
-+ * - on-disk bitmap
-+ * - in-core buddy (actually includes buddy and bitmap)
-+ * - preallocation descriptors (PAs)
-+ *
-+ * there are two types of preallocations:
-+ * - inode
-+ * assiged to specific inode and can be used for this inode only.
-+ * it describes part of inode's space preallocated to specific
-+ * physical blocks. any block from that preallocated can be used
-+ * independent. the descriptor just tracks number of blocks left
-+ * unused. so, before taking some block from descriptor, one must
-+ * make sure corresponded logical block isn't allocated yet. this
-+ * also means that freeing any block within descriptor's range
-+ * must discard all preallocated blocks.
-+ * - locality group
-+ * assigned to specific locality group which does not translate to
-+ * permanent set of inodes: inode can join and leave group. space
-+ * from this type of preallocation can be used for any inode. thus
-+ * it's consumed from the beginning to the end.
-+ *
-+ * relation between them can be expressed as:
-+ * in-core buddy = on-disk bitmap + preallocation descriptors
-+ *
-+ * this mean blocks mballoc considers used are:
-+ * - allocated blocks (persistent)
-+ * - preallocated blocks (non-persistent)
-+ *
-+ * consistency in mballoc world means that at any time a block is either
-+ * free or used in ALL structures. notice: "any time" should not be read
-+ * literally -- time is discrete and delimited by locks.
-+ *
-+ * to keep it simple, we don't use block numbers, instead we count number of
-+ * blocks: how many blocks marked used/free in on-disk bitmap, buddy and PA.
-+ *
-+ * all operations can be expressed as:
-+ * - init buddy: buddy = on-disk + PAs
-+ * - new PA: buddy += N; PA = N
-+ * - use inode PA: on-disk += N; PA -= N
-+ * - discard inode PA buddy -= on-disk - PA; PA = 0
-+ * - use locality group PA on-disk += N; PA -= N
-+ * - discard locality group PA buddy -= PA; PA = 0
-+ * note: 'buddy -= on-disk - PA' is used to show that on-disk bitmap
-+ * is used in real operation because we can't know actual used
-+ * bits from PA, only from on-disk bitmap
-+ *
-+ * if we follow this strict logic, then all operations above should be atomic.
-+ * given some of them can block, we'd have to use something like semaphores
-+ * killing performance on high-end SMP hardware. let's try to relax it using
-+ * the following knowledge:
-+ * 1) if buddy is referenced, it's already initialized
-+ * 2) while block is used in buddy and the buddy is referenced,
-+ * nobody can re-allocate that block
-+ * 3) we work on bitmaps and '+' actually means 'set bits'. if on-disk has
-+ * bit set and PA claims same block, it's OK. IOW, one can set bit in
-+ * on-disk bitmap if buddy has same bit set or/and PA covers corresponded
-+ * block
-+ *
-+ * so, now we're building a concurrency table:
-+ * - init buddy vs.
-+ * - new PA
-+ * blocks for PA are allocated in the buddy, buddy must be referenced
-+ * until PA is linked to allocation group to avoid concurrent buddy init
-+ * - use inode PA
-+ * we need to make sure that either on-disk bitmap or PA has uptodate data
-+ * given (3) we care that PA-=N operation doesn't interfere with init
-+ * - discard inode PA
-+ * the simplest way would be to have buddy initialized by the discard
-+ * - use locality group PA
-+ * again PA-=N must be serialized with init
-+ * - discard locality group PA
-+ * the simplest way would be to have buddy initialized by the discard
-+ * - new PA vs.
-+ * - use inode PA
-+ * i_truncate_mutex serializes them
-+ * - discard inode PA
-+ * discard process must wait until PA isn't used by another process
-+ * - use locality group PA
-+ * some mutex should serialize them
-+ * - discard locality group PA
-+ * discard process must wait until PA isn't used by another process
-+ * - use inode PA
-+ * - use inode PA
-+ * i_truncate_mutex or another mutex should serializes them
-+ * - discard inode PA
-+ * discard process must wait until PA isn't used by another process
-+ * - use locality group PA
-+ * nothing wrong here -- they're different PAs covering different blocks
-+ * - discard locality group PA
-+ * discard process must wait until PA isn't used by another process
-+ *
-+ * now we're ready to make few consequences:
-+ * - PA is referenced and while it is no discard is possible
-+ * - PA is referenced until block isn't marked in on-disk bitmap
-+ * - PA changes only after on-disk bitmap
-+ * - discard must not compete with init. either init is done before
-+ * any discard or they're serialized somehow
-+ * - buddy init as sum of on-disk bitmap and PAs is done atomically
-+ *
-+ * a special case when we've used PA to emptiness. no need to modify buddy
-+ * in this case, but we should care about concurrent init
-+ *
-+ */
-+
-+ /*
-+ * Logic in few words:
-+ *
-+ * - allocation:
-+ * load group
-+ * find blocks
-+ * mark bits in on-disk bitmap
-+ * release group
-+ *
-+ * - use preallocation:
-+ * find proper PA (per-inode or group)
-+ * load group
-+ * mark bits in on-disk bitmap
-+ * release group
-+ * release PA
-+ *
-+ * - free:
-+ * load group
-+ * mark bits in on-disk bitmap
-+ * release group
-+ *
-+ * - discard preallocations in group:
-+ * mark PAs deleted
-+ * move them onto local list
-+ * load on-disk bitmap
-+ * load group
-+ * remove PA from object (inode or locality group)
-+ * mark free blocks in-core
-+ *
-+ * - discard inode's preallocations:
-+ */
-+
-+/*
-+ * Locking rules
-+ *
-+ * Locks:
-+ * - bitlock on a group (group)
-+ * - object (inode/locality) (object)
-+ * - per-pa lock (pa)
-+ *
-+ * Paths:
-+ * - new pa
-+ * object
-+ * group
-+ *
-+ * - find and use pa:
-+ * pa
-+ *
-+ * - release consumed pa:
-+ * pa
-+ * group
-+ * object
-+ *
-+ * - generate in-core bitmap:
-+ * group
-+ * pa
-+ *
-+ * - discard all for given object (inode, locality group):
-+ * object
-+ * pa
-+ * group
-+ *
-+ * - discard all for given group:
-+ * group
-+ * pa
-+ * group
-+ * object
-+ *
-+ */
-+
-+/*
-+ * with AGGRESSIVE_CHECK allocator runs consistency checks over
-+ * structures. these checks slow things down a lot
-+ */
-+#define AGGRESSIVE_CHECK__
-+
-+/*
-+ * with DOUBLE_CHECK defined mballoc creates persistent in-core
-+ * bitmaps, maintains and uses them to check for double allocations
-+ */
-+#define DOUBLE_CHECK__
-+
-+/*
-+ */
-+#define MB_DEBUG__
-+#ifdef MB_DEBUG
-+#define mb_debug(fmt,a...) printk(fmt, ##a)
-+#else
-+#define mb_debug(fmt,a...)
-+#endif
-+
-+/*
-+ * with EXT3_MB_HISTORY mballoc stores last N allocations in memory
-+ * and you can monitor it in /proc/fs/ext3/<dev>/mb_history
-+ */
-+#define EXT3_MB_HISTORY
-+#define EXT3_MB_HISTORY_ALLOC 1 /* allocation */
-+#define EXT3_MB_HISTORY_PREALLOC 2 /* preallocated blocks used */
-+#define EXT3_MB_HISTORY_DISCARD 4 /* preallocation discarded */
-+#define EXT3_MB_HISTORY_FREE 8 /* free */
-+
-+#define EXT3_MB_HISTORY_DEFAULT (EXT3_MB_HISTORY_ALLOC | \
-+ EXT3_MB_HISTORY_PREALLOC | \
-+ EXT3_MB_HISTORY_DISCARD | \
-+ EXT3_MB_HISTORY_FREE)
-+
-+/*
-+ * How long mballoc can look for a best extent (in found extents)
-+ */
-+#define MB_DEFAULT_MAX_TO_SCAN 200
-+
-+/*
-+ * How long mballoc must look for a best extent
-+ */
-+#define MB_DEFAULT_MIN_TO_SCAN 10
-+
-+/*
-+ * How many groups mballoc will scan looking for the best chunk
-+ */
-+#define MB_DEFAULT_MAX_GROUPS_TO_SCAN 5
-+
-+/*
-+ * with 'ext3_mb_stats' allocator will collect stats that will be
-+ * shown at umount. The collecting costs though!
-+ */
-+#define MB_DEFAULT_STATS 1
-+
-+/*
-+ * files smaller than MB_DEFAULT_STREAM_THRESHOLD are served
-+ * by the stream allocator, which purpose is to pack requests
-+ * as close each to other as possible to produce smooth I/O traffic
-+ */
-+#define MB_DEFAULT_STREAM_THRESHOLD 16 /* 64K */
-+
-+/*
-+ * for which requests use 2^N search using buddies
-+ */
-+#define MB_DEFAULT_ORDER2_REQS 8
-+
-+/*
-+ * default stripe size = 1MB
-+ */
-+#define MB_DEFAULT_STRIPE 256
-+
-+static struct kmem_cache *ext3_pspace_cachep = NULL;
-+
-+#ifdef EXT3_BB_MAX_BLOCKS
-+#undef EXT3_BB_MAX_BLOCKS
-+#endif
-+#define EXT3_BB_MAX_BLOCKS 30
-+
-+struct ext3_free_metadata {
-+ unsigned short group;
-+ unsigned short num;
-+ unsigned short blocks[EXT3_BB_MAX_BLOCKS];
-+ struct list_head list;
-+};
-+
-+struct ext3_group_info {
-+ unsigned long bb_state;
-+ unsigned long bb_tid;
-+ struct ext3_free_metadata *bb_md_cur;
-+ unsigned short bb_first_free;
-+ unsigned short bb_free;
-+ unsigned short bb_fragments;
-+ struct list_head bb_prealloc_list;
-+#ifdef DOUBLE_CHECK
-+ void *bb_bitmap;
-+#endif
-+ unsigned short bb_counters[];
-+};
-+
-+#define EXT3_GROUP_INFO_NEED_INIT_BIT 0
-+#define EXT3_GROUP_INFO_LOCKED_BIT 1
-+
-+#define EXT3_MB_GRP_NEED_INIT(grp) \
-+ (test_bit(EXT3_GROUP_INFO_NEED_INIT_BIT, &(grp)->bb_state))
-+
-+
-+struct ext3_prealloc_space {
-+ struct list_head pa_inode_list;
-+ struct list_head pa_group_list;
-+ union {
-+ struct list_head pa_tmp_list;
-+ struct rcu_head pa_rcu;
-+ } u;
-+ spinlock_t pa_lock;
-+ atomic_t pa_count;
-+ unsigned pa_deleted;
-+ unsigned long pa_pstart; /* phys. block */
-+ unsigned long pa_lstart; /* log. block */
-+ unsigned short pa_len; /* len of preallocated chunk */
-+ unsigned short pa_free; /* how many blocks are free */
-+ unsigned short pa_linear; /* consumed in one direction
-+ * strictly, for group prealloc */
-+ spinlock_t *pa_obj_lock;
-+ struct inode *pa_inode; /* hack, for history only */
-+};
-+
-+
-+struct ext3_free_extent {
-+ unsigned long fe_logical;
-+ unsigned long fe_start;
-+ unsigned long fe_group;
-+ unsigned long fe_len;
-+};
-+
-+/*
-+ * Locality group:
-+ * we try to group all related changes together
-+ * so that writeback can flush/allocate them together as well
-+ */
-+struct ext3_locality_group {
-+ /* for allocator */
-+ struct semaphore lg_sem; /* to serialize allocates */
-+ struct list_head lg_prealloc_list;/* list of preallocations */
-+ spinlock_t lg_prealloc_lock;
-+};
-+
-+struct ext3_allocation_context {
-+ struct inode *ac_inode;
-+ struct super_block *ac_sb;
-+
-+ /* original request */
-+ struct ext3_free_extent ac_o_ex;
-+
-+ /* goal request (after normalization) */
-+ struct ext3_free_extent ac_g_ex;
-+
-+ /* the best found extent */
-+ struct ext3_free_extent ac_b_ex;
-+
-+ /* copy of the bext found extent taken before preallocation efforts */
-+ struct ext3_free_extent ac_f_ex;
-+
-+ /* number of iterations done. we have to track to limit searching */
-+ unsigned long ac_ex_scanned;
-+ __u16 ac_groups_scanned;
-+ __u16 ac_found;
-+ __u16 ac_tail;
-+ __u16 ac_buddy;
-+ __u16 ac_flags; /* allocation hints */
-+ __u8 ac_status;
-+ __u8 ac_criteria;
-+ __u8 ac_repeats;
-+ __u8 ac_2order; /* if request is to allocate 2^N blocks and
-+ * N > 0, the field stores N, otherwise 0 */
-+ __u8 ac_op; /* operation, for history only */
-+ struct page *ac_bitmap_page;
-+ struct page *ac_buddy_page;
-+ struct ext3_prealloc_space *ac_pa;
-+ struct ext3_locality_group *ac_lg;
-+};
-+
-+#define AC_STATUS_CONTINUE 1
-+#define AC_STATUS_FOUND 2
-+#define AC_STATUS_BREAK 3
-+
-+struct ext3_mb_history {
-+ struct ext3_free_extent orig; /* orig allocation */
-+ struct ext3_free_extent goal; /* goal allocation */
-+ struct ext3_free_extent result; /* result allocation */
-+ unsigned pid;
-+ unsigned ino;
-+ __u16 found; /* how many extents have been found */
-+ __u16 groups; /* how many groups have been scanned */
-+ __u16 tail; /* what tail broke some buddy */
-+ __u16 buddy; /* buddy the tail ^^^ broke */
-+ __u16 flags;
-+ __u8 cr:3; /* which phase the result extent was found at */
-+ __u8 op:4;
-+ __u8 merged:1;
-+};
-+
-+struct ext3_buddy {
-+ struct page *bd_buddy_page;
-+ void *bd_buddy;
-+ struct page *bd_bitmap_page;
-+ void *bd_bitmap;
-+ struct ext3_group_info *bd_info;
-+ struct super_block *bd_sb;
-+ __u16 bd_blkbits;
-+ __u16 bd_group;
-+};
-+#define EXT3_MB_BITMAP(e3b) ((e3b)->bd_bitmap)
-+#define EXT3_MB_BUDDY(e3b) ((e3b)->bd_buddy)
-+
-+#ifndef EXT3_MB_HISTORY
-+#define ext3_mb_store_history(ac)
-+#else
-+static void ext3_mb_store_history(struct ext3_allocation_context *ac);
-+#endif
-+
-+#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
-+
-+static struct proc_dir_entry *proc_root_ext3;
-+
-+int ext3_create (struct inode *, struct dentry *, int, struct nameidata *);
-+struct buffer_head * read_block_bitmap(struct super_block *, unsigned int);
-+unsigned long ext3_new_blocks_old(handle_t *handle, struct inode *inode,
-+ unsigned long goal, unsigned long *count, int *errp);
-+void ext3_mb_release_blocks(struct super_block *, int);
-+void ext3_mb_poll_new_transaction(struct super_block *, handle_t *);
-+void ext3_mb_free_committed_blocks(struct super_block *);
-+void ext3_mb_generate_from_pa(struct super_block *sb, void *bitmap, int group);
-+void ext3_mb_free_consumed_preallocations(struct ext3_allocation_context *ac);
-+void ext3_mb_return_to_preallocation(struct inode *inode, struct ext3_buddy *e3b,
-+ sector_t block, int count);
-+void ext3_mb_show_ac(struct ext3_allocation_context *ac);
-+void ext3_mb_check_with_pa(struct ext3_buddy *e3b, int first, int count);
-+void ext3_mb_put_pa(struct ext3_allocation_context *, struct super_block *, struct ext3_prealloc_space *pa);
-+int ext3_mb_init_per_dev_proc(struct super_block *sb);
-+int ext3_mb_destroy_per_dev_proc(struct super_block *sb);
-+
-+/*
-+ * Calculate the block group number and offset, given a block number
-+ */
-+static void ext3_get_group_no_and_offset(struct super_block *sb,
-+ unsigned long blocknr,
-+ unsigned long *blockgrpp,
-+ unsigned long *offsetp)
-+{
-+ struct ext3_super_block *es = EXT3_SB(sb)->s_es;
-+ unsigned long offset;
-+
-+ blocknr = blocknr - le32_to_cpu(es->s_first_data_block);
-+ offset = blocknr % EXT3_BLOCKS_PER_GROUP(sb);
-+ blocknr = blocknr / EXT3_BLOCKS_PER_GROUP(sb);
-+ if (offsetp)
-+ *offsetp = offset;
-+ if (blockgrpp)
-+ *blockgrpp = blocknr;
-+
-+}
-+
-+static inline void
-+ext3_lock_group(struct super_block *sb, int group)
-+{
-+ bit_spin_lock(EXT3_GROUP_INFO_LOCKED_BIT,
-+ &EXT3_GROUP_INFO(sb, group)->bb_state);
-+}
-+
-+static inline void
-+ext3_unlock_group(struct super_block *sb, int group)
-+{
-+ bit_spin_unlock(EXT3_GROUP_INFO_LOCKED_BIT,
-+ &EXT3_GROUP_INFO(sb, group)->bb_state);
-+}
-+
-+static inline int
-+ext3_is_group_locked(struct super_block *sb, int group)
-+{
-+ return bit_spin_is_locked(EXT3_GROUP_INFO_LOCKED_BIT,
-+ &EXT3_GROUP_INFO(sb, group)->bb_state);
-+}
-+
-+unsigned long ext3_grp_offs_to_block(struct super_block *sb,
-+ struct ext3_free_extent *fex)
-+{
-+ unsigned long block;
-+
-+ block = (unsigned long) fex->fe_group * EXT3_BLOCKS_PER_GROUP(sb)
-+ + fex->fe_start
-+ + le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block);
-+ return block;
-+}
-+
-+#if BITS_PER_LONG == 64
-+#define mb_correct_addr_and_bit(bit,addr) \
-+{ \
-+ bit += ((unsigned long) addr & 7UL) << 3; \
-+ addr = (void *) ((unsigned long) addr & ~7UL); \
-+}
-+#elif BITS_PER_LONG == 32
-+#define mb_correct_addr_and_bit(bit,addr) \
-+{ \
-+ bit += ((unsigned long) addr & 3UL) << 3; \
-+ addr = (void *) ((unsigned long) addr & ~3UL); \
-+}
-+#else
-+#error "how many bits you are?!"
-+#endif
-+
-+static inline int mb_test_bit(int bit, void *addr)
-+{
-+ mb_correct_addr_and_bit(bit,addr);
-+ return ext2_test_bit(bit, addr);
-+}
-+
-+static inline void mb_set_bit(int bit, void *addr)
-+{
-+ mb_correct_addr_and_bit(bit,addr);
-+ ext2_set_bit(bit, addr);
-+}
-+
-+static inline void mb_set_bit_atomic(spinlock_t *lock, int bit, void *addr)
-+{
-+ mb_correct_addr_and_bit(bit,addr);
-+ ext2_set_bit_atomic(lock, bit, addr);
-+}
-+
-+static inline void mb_clear_bit(int bit, void *addr)
-+{
-+ mb_correct_addr_and_bit(bit,addr);
-+ ext2_clear_bit(bit, addr);
-+}
-+
-+static inline void mb_clear_bit_atomic(spinlock_t *lock, int bit, void *addr)
-+{
-+ mb_correct_addr_and_bit(bit,addr);
-+ ext2_clear_bit_atomic(lock, bit, addr);
-+}
-+
-+static inline int mb_find_next_zero_bit(void *addr, int max, int start)
-+{
-+ int fix;
-+#if BITS_PER_LONG == 64
-+ fix = ((unsigned long) addr & 7UL) << 3;
-+ addr = (void *) ((unsigned long) addr & ~7UL);
-+#elif BITS_PER_LONG == 32
-+ fix = ((unsigned long) addr & 3UL) << 3;
-+ addr = (void *) ((unsigned long) addr & ~3UL);
-+#else
-+#error "how many bits you are?!"
-+#endif
-+ max += fix;
-+ start += fix;
-+ return ext2_find_next_zero_bit(addr, max, start) - fix;
-+}
-+
-+static inline int mb_find_next_bit(void *addr, int max, int start)
-+{
-+ int fix;
-+#if BITS_PER_LONG == 64
-+ fix = ((unsigned long) addr & 7UL) << 3;
-+ addr = (void *) ((unsigned long) addr & ~7UL);
-+#elif BITS_PER_LONG == 32
-+ fix = ((unsigned long) addr & 3UL) << 3;
-+ addr = (void *) ((unsigned long) addr & ~3UL);
-+#else
-+#error "how many bits you are?!"
-+#endif
-+ max += fix;
-+ start += fix;
-+
-+#ifdef __BIG_ENDIAN
-+#else
-+ return find_next_bit(addr, max, start) - fix;
-+#endif
-+}
-+
-+static inline void *mb_find_buddy(struct ext3_buddy *e3b, int order, int *max)
-+{
-+ char *bb;
-+
-+ BUG_ON(EXT3_MB_BITMAP(e3b) == EXT3_MB_BUDDY(e3b));
-+ BUG_ON(max == NULL);
-+
-+ if (order > e3b->bd_blkbits + 1) {
-+ *max = 0;
-+ return NULL;
-+ }
-+
-+ /* at order 0 we see each particular block */
-+ *max = 1 << (e3b->bd_blkbits + 3);
-+ if (order == 0)
-+ return EXT3_MB_BITMAP(e3b);
-+
-+ bb = EXT3_MB_BUDDY(e3b) + EXT3_SB(e3b->bd_sb)->s_mb_offsets[order];
-+ *max = EXT3_SB(e3b->bd_sb)->s_mb_maxs[order];
-+
-+ return bb;
-+}
-+
-+#ifdef DOUBLE_CHECK
-+void mb_free_blocks_double(struct inode *inode, struct ext3_buddy *e3b,
-+ int first, int count)
-+{
-+ int i;
-+ struct super_block *sb = e3b->bd_sb;
-+
-+ if (unlikely(e3b->bd_info->bb_bitmap == NULL))
-+ return;
-+ BUG_ON(!ext3_is_group_locked(sb, e3b->bd_group));
-+ for (i = 0; i < count; i++) {
-+ if (!mb_test_bit(first + i, e3b->bd_info->bb_bitmap)) {
-+ unsigned long blocknr;
-+ blocknr = e3b->bd_group * EXT3_BLOCKS_PER_GROUP(sb);
-+ blocknr += first + i;
-+ blocknr +=
-+ le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block);
-+
-+ ext3_error(sb, __FUNCTION__, "double-free of inode"
-+ " %lu's block %lu(bit %u in group %u)\n",
-+ inode ? inode->i_ino : 0, blocknr,
-+ first + i, e3b->bd_group);
-+ }
-+ mb_clear_bit(first + i, e3b->bd_info->bb_bitmap);
-+ }
-+}
-+
-+void mb_mark_used_double(struct ext3_buddy *e3b, int first, int count)
-+{
-+ int i;
-+ if (unlikely(e3b->bd_info->bb_bitmap == NULL))
-+ return;
-+ BUG_ON(!ext3_is_group_locked(e3b->bd_sb, e3b->bd_group));
-+ for (i = 0; i < count; i++) {
-+ BUG_ON(mb_test_bit(first + i, e3b->bd_info->bb_bitmap));
-+ mb_set_bit(first + i, e3b->bd_info->bb_bitmap);
-+ }
-+}
-+
-+void mb_cmp_bitmaps(struct ext3_buddy *e3b, void *bitmap)
-+{
-+ if (memcmp(e3b->bd_info->bb_bitmap, bitmap, e3b->bd_sb->s_blocksize)) {
-+ unsigned char *b1, *b2;
-+ int i;
-+ b1 = (unsigned char *) e3b->bd_info->bb_bitmap;
-+ b2 = (unsigned char *) bitmap;
-+ for (i = 0; i < e3b->bd_sb->s_blocksize; i++) {
-+ if (b1[i] != b2[i]) {
-+ printk("corruption in group %u at byte %u(%u): "
-+ "%x in copy != %x on disk/prealloc\n",
-+ e3b->bd_group, i, i * 8, b1[i], b2[i]);
-+ BUG();
-+ }
-+ }
-+ }
-+}
-+
-+#else
-+#define mb_free_blocks_double(a,b,c,d)
-+#define mb_mark_used_double(a,b,c)
-+#define mb_cmp_bitmaps(a,b)
-+#endif
-+
-+#ifdef AGGRESSIVE_CHECK
-+
-+#define MB_CHECK_ASSERT(assert) \
-+do { \
-+ if (!(assert)) { \
-+ printk (KERN_EMERG \
-+ "Assertion failure in %s() at %s:%d: \"%s\"\n", \
-+ function, file, line, # assert); \
-+ BUG(); \
-+ } \
-+} while (0)
-+
-+static int __mb_check_buddy(struct ext3_buddy *e3b, char *file,
-+ const char *function, int line)
-+{
-+ struct super_block *sb = e3b->bd_sb;
-+ int order = e3b->bd_blkbits + 1;
-+ int max, max2, i, j, k, count;
-+ struct ext3_group_info *grp;
-+ int fragments = 0, fstart;
-+ struct list_head *cur;
-+ void *buddy, *buddy2;
-+
-+ if (!test_opt(sb, MBALLOC))
-+ return 0;
-+
-+ {
-+ static int mb_check_counter = 0;
-+ if (mb_check_counter++ % 100 != 0)
-+ return 0;
-+ }
-+
-+ while (order > 1) {
-+ buddy = mb_find_buddy(e3b, order, &max);
-+ MB_CHECK_ASSERT(buddy);
-+ buddy2 = mb_find_buddy(e3b, order - 1, &max2);
-+ MB_CHECK_ASSERT(buddy2);
-+ MB_CHECK_ASSERT(buddy != buddy2);
-+ MB_CHECK_ASSERT(max * 2 == max2);
-+
-+ count = 0;
-+ for (i = 0; i < max; i++) {
-+
-+ if (mb_test_bit(i, buddy)) {
-+ /* only single bit in buddy2 may be 1 */
-+ if (!mb_test_bit(i << 1, buddy2))
-+ MB_CHECK_ASSERT(mb_test_bit((i<<1)+1, buddy2));
-+ else if (!mb_test_bit((i << 1) + 1, buddy2))
-+ MB_CHECK_ASSERT(mb_test_bit(i << 1, buddy2));
-+ continue;
-+ }
-+
-+ /* both bits in buddy2 must be 0 */
-+ MB_CHECK_ASSERT(mb_test_bit(i << 1, buddy2));
-+ MB_CHECK_ASSERT(mb_test_bit((i << 1) + 1, buddy2));
-+
-+ for (j = 0; j < (1 << order); j++) {
-+ k = (i * (1 << order)) + j;
-+ MB_CHECK_ASSERT(!mb_test_bit(k, EXT3_MB_BITMAP(e3b)));
-+ }
-+ count++;
-+ }
-+ MB_CHECK_ASSERT(e3b->bd_info->bb_counters[order] == count);
-+ order--;
-+ }
-+
-+ fstart = -1;
-+ buddy = mb_find_buddy(e3b, 0, &max);
-+ for (i = 0; i < max; i++) {
-+ if (!mb_test_bit(i, buddy)) {
-+ MB_CHECK_ASSERT(i >= e3b->bd_info->bb_first_free);
-+ if (fstart == -1) {
-+ fragments++;
-+ fstart = i;
-+ }
-+ continue;
-+ }
-+ fstart = -1;
-+ /* check used bits only */
-+ for (j = 0; j < e3b->bd_blkbits + 1; j++) {
-+ buddy2 = mb_find_buddy(e3b, j, &max2);
-+ k = i >> j;
-+ MB_CHECK_ASSERT(k < max2);
-+ MB_CHECK_ASSERT(mb_test_bit(k, buddy2));
-+ }
-+ }
-+ MB_CHECK_ASSERT(!EXT3_MB_GRP_NEED_INIT(e3b->bd_info));
-+ MB_CHECK_ASSERT(e3b->bd_info->bb_fragments == fragments);
-+
-+ grp = EXT3_GROUP_INFO(sb, e3b->bd_group);
-+ buddy = mb_find_buddy(e3b, 0, &max);
-+ list_for_each(cur, &grp->bb_prealloc_list) {
-+ unsigned long groupnr;
-+ struct ext3_prealloc_space *pa;
-+ pa = list_entry(cur, struct ext3_prealloc_space, group_list);
-+ ext3_get_group_no_and_offset(sb, pa->pstart, &groupnr, &k);
-+ MB_CHECK_ASSERT(groupnr == e3b->bd_group);
-+ for (i = 0; i < pa->len; i++)
-+ MB_CHECK_ASSERT(mb_test_bit(k + i, buddy));
-+ }
-+ return 0;
-+}
-+#undef MB_CHECK_ASSERT
-+#define mb_check_buddy(e3b) __mb_check_buddy(e3b,__FILE__,__FUNCTION__,__LINE__)
-+#else
-+#define mb_check_buddy(e3b)
-+#endif
-+
-+/* find most significant bit */
-+static int inline fmsb(unsigned short word)
-+{
-+ int order;
-+
-+ if (word > 255) {
-+ order = 7;
-+ word >>= 8;
-+ } else {
-+ order = -1;
-+ }
-+
-+ do {
-+ order++;
-+ word >>= 1;
-+ } while (word != 0);
-+
-+ return order;
-+}
-+
-+static void inline
-+ext3_mb_mark_free_simple(struct super_block *sb, void *buddy, unsigned first,
-+ int len, struct ext3_group_info *grp)
-+{
-+ struct ext3_sb_info *sbi = EXT3_SB(sb);
-+ unsigned short min, max, chunk, border;
-+
-+ BUG_ON(len >= EXT3_BLOCKS_PER_GROUP(sb));
-+
-+ border = 2 << sb->s_blocksize_bits;
-+
-+ while (len > 0) {
-+ /* find how many blocks can be covered since this position */
-+ max = ffs(first | border) - 1;
-+
-+ /* find how many blocks of power 2 we need to mark */
-+ min = fmsb(len);
-+
-+ if (max < min)
-+ min = max;
-+ chunk = 1 << min;
-+
-+ /* mark multiblock chunks only */
-+ grp->bb_counters[min]++;
-+ if (min > 0)
-+ mb_clear_bit(first >> min, buddy + sbi->s_mb_offsets[min]);
-+
-+ len -= chunk;
-+ first += chunk;
-+ }
-+}
-+
-+static void
-+ext3_mb_generate_buddy(struct super_block *sb, void *buddy, void *bitmap,
-+ int group)
-+{
-+ struct ext3_group_info *grp = EXT3_GROUP_INFO(sb, group);
-+ unsigned short max = EXT3_BLOCKS_PER_GROUP(sb);
-+ unsigned short i = 0, first, len;
-+ unsigned free = 0, fragments = 0;
-+ unsigned long long period = get_cycles();
-+
-+ /* initialize buddy from bitmap which is aggregation
-+ * of on-disk bitmap and preallocations */
-+ i = mb_find_next_zero_bit(bitmap, max, 0);
-+ grp->bb_first_free = i;
-+ while (i < max) {
-+ fragments++;
-+ first = i;
-+ i = ext2_find_next_le_bit(bitmap, max, i);
-+ len = i - first;
-+ free += len;
-+ if (len > 1)
-+ ext3_mb_mark_free_simple(sb, buddy, first, len, grp);
-+ else
-+ grp->bb_counters[0]++;
-+ if (i < max)
-+ i = mb_find_next_zero_bit(bitmap, max, i);
-+ }
-+ grp->bb_fragments = fragments;
-+
-+ if (free != grp->bb_free) {
-+ printk("EXT3-fs: group %u: %u blocks in bitmap, %u in gd\n",
-+ group, free, grp->bb_free);
-+ grp->bb_free = free;
-+ }
-+
-+ clear_bit(EXT3_GROUP_INFO_NEED_INIT_BIT, &grp->bb_state);
-+
-+ period = get_cycles() - period;
-+ spin_lock(&EXT3_SB(sb)->s_bal_lock);
-+ EXT3_SB(sb)->s_mb_buddies_generated++;
-+ EXT3_SB(sb)->s_mb_generation_time += period;
-+ spin_unlock(&EXT3_SB(sb)->s_bal_lock);
-+}
-+
-+static int ext3_mb_init_cache(struct page *page, char *incore)
-+{
-+ int blocksize, blocks_per_page, groups_per_page;
-+ int err = 0, i, first_group, first_block;
-+ struct super_block *sb;
-+ struct buffer_head *bhs;
-+ struct buffer_head **bh;
-+ struct inode *inode;
-+ char *data, *bitmap;
-+
-+ mb_debug("init page %lu\n", page->index);
-+
-+ inode = page->mapping->host;
-+ sb = inode->i_sb;
-+ blocksize = 1 << inode->i_blkbits;
-+ blocks_per_page = PAGE_CACHE_SIZE / blocksize;
-+
-+ groups_per_page = blocks_per_page >> 1;
-+ if (groups_per_page == 0)
-+ groups_per_page = 1;
-+
-+ /* allocate buffer_heads to read bitmaps */
-+ if (groups_per_page > 1) {
-+ err = -ENOMEM;
-+ i = sizeof(struct buffer_head *) * groups_per_page;
-+ bh = kmalloc(i, GFP_NOFS);
-+ if (bh == NULL)
-+ goto out;
-+ memset(bh, 0, i);
-+ } else
-+ bh = &bhs;
-+
-+ first_group = page->index * blocks_per_page / 2;
-+
-+ /* read all groups the page covers into the cache */
-+ for (i = 0; i < groups_per_page; i++) {
-+ struct ext3_group_desc * desc;
-+
-+ if (first_group + i >= EXT3_SB(sb)->s_groups_count)
-+ break;
-+
-+ err = -EIO;
-+ desc = ext3_get_group_desc(sb, first_group + i, NULL);
-+ if (desc == NULL)
-+ goto out;
-+
-+ err = -ENOMEM;
-+ bh[i] = sb_getblk(sb, le32_to_cpu(desc->bg_block_bitmap));
-+ if (bh[i] == NULL)
-+ goto out;
-+
-+ if (buffer_uptodate(bh[i]))
-+ continue;
-+
-+ lock_buffer(bh[i]);
-+ if (buffer_uptodate(bh[i])) {
-+ unlock_buffer(bh[i]);
-+ continue;
-+ }
-+
-+ get_bh(bh[i]);
-+ bh[i]->b_end_io = end_buffer_read_sync;
-+ submit_bh(READ, bh[i]);
-+ mb_debug("read bitmap for group %u\n", first_group + i);
-+ }
-+
-+ /* wait for I/O completion */
-+ for (i = 0; i < groups_per_page && bh[i]; i++)
-+ wait_on_buffer(bh[i]);
-+
-+ err = -EIO;
-+ for (i = 0; i < groups_per_page && bh[i]; i++)
-+ if (!buffer_uptodate(bh[i]))
-+ goto out;
-+
-+ first_block = page->index * blocks_per_page;
-+ for (i = 0; i < blocks_per_page; i++) {
-+ int group;
-+
-+ group = (first_block + i) >> 1;
-+ if (group >= EXT3_SB(sb)->s_groups_count)
-+ break;
-+
-+ data = page_address(page) + (i * blocksize);
-+ bitmap = bh[group - first_group]->b_data;
-+
-+ if ((first_block + i) & 1) {
-+ /* this is block of buddy */
-+ 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);
-+ EXT3_GROUP_INFO(sb, group)->bb_fragments = 0;
-+ memset(EXT3_GROUP_INFO(sb, group)->bb_counters, 0,
-+ sizeof(unsigned short)*(sb->s_blocksize_bits+2));
-+ ext3_mb_generate_buddy(sb, data, incore, group);
-+ incore = NULL;
-+ } else {
-+ /* this is block of bitmap */
-+ BUG_ON(incore != NULL);
-+ mb_debug("put bitmap for group %u in page %lu/%x\n",
-+ group, page->index, i * blocksize);
-+
-+ /* see comments in ext3_mb_put_pa() */
-+ ext3_lock_group(sb, group);
-+ memcpy(data, bitmap, blocksize);
-+
-+ /* mark all preallocated blocks used in in-core bitmap */
-+ ext3_mb_generate_from_pa(sb, data, group);
-+ ext3_unlock_group(sb, group);
-+
-+ incore = data;
-+ }
-+ }
-+ SetPageUptodate(page);
-+
-+out:
-+ if (bh) {
-+ for (i = 0; i < groups_per_page && bh[i]; i++)
-+ brelse(bh[i]);
-+ if (bh != &bhs)
-+ kfree(bh);
-+ }
-+ return err;
-+}
-+
-+static int ext3_mb_load_buddy(struct super_block *sb, int group,
-+ struct ext3_buddy *e3b)
-+{
-+ struct ext3_sb_info *sbi = EXT3_SB(sb);
-+ struct inode *inode = sbi->s_buddy_cache;
-+ int blocks_per_page, block, pnum, poff;
-+ struct page *page;
-+
-+ mb_debug("load group %u\n", group);
-+
-+ blocks_per_page = PAGE_CACHE_SIZE / sb->s_blocksize;
-+
-+ e3b->bd_blkbits = sb->s_blocksize_bits;
-+ e3b->bd_info = EXT3_GROUP_INFO(sb, group);
-+ e3b->bd_sb = sb;
-+ e3b->bd_group = group;
-+ e3b->bd_buddy_page = NULL;
-+ e3b->bd_bitmap_page = NULL;
-+
-+ block = group * 2;
-+ pnum = block / blocks_per_page;
-+ poff = block % blocks_per_page;
-+
-+ /* we could use find_or_create_page(), but it locks page
-+ * what we'd like to avoid in fast path ... */
-+ page = find_get_page(inode->i_mapping, pnum);
-+ if (page == NULL || !PageUptodate(page)) {
-+ if (page)
-+ page_cache_release(page);
-+ page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS);
-+ if (page) {
-+ BUG_ON(page->mapping != inode->i_mapping);
-+ if (!PageUptodate(page)) {
-+ ext3_mb_init_cache(page, NULL);
-+ mb_cmp_bitmaps(e3b, page_address(page) +
-+ (poff * sb->s_blocksize));
-+ }
-+ unlock_page(page);
-+ }
-+ }
-+ if (page == NULL || !PageUptodate(page))
-+ goto err;
-+ e3b->bd_bitmap_page = page;
-+ e3b->bd_bitmap = page_address(page) + (poff * sb->s_blocksize);
-+ mark_page_accessed(page);
-+
-+ block++;
-+ pnum = block / blocks_per_page;
-+ poff = block % blocks_per_page;
-+
-+ page = find_get_page(inode->i_mapping, pnum);
-+ if (page == NULL || !PageUptodate(page)) {
-+ if (page)
-+ page_cache_release(page);
-+ page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS);
-+ if (page) {
-+ BUG_ON(page->mapping != inode->i_mapping);
-+ if (!PageUptodate(page))
-+ ext3_mb_init_cache(page, e3b->bd_bitmap);
-+
-+ unlock_page(page);
-+ }
-+ }
-+ if (page == NULL || !PageUptodate(page))
-+ goto err;
-+ e3b->bd_buddy_page = page;
-+ e3b->bd_buddy = page_address(page) + (poff * sb->s_blocksize);
-+ mark_page_accessed(page);
-+
-+ BUG_ON(e3b->bd_bitmap_page == NULL);
-+ BUG_ON(e3b->bd_buddy_page == NULL);
-+
-+ return 0;
-+
-+err:
-+ if (e3b->bd_bitmap_page)
-+ page_cache_release(e3b->bd_bitmap_page);
-+ if (e3b->bd_buddy_page)
-+ page_cache_release(e3b->bd_buddy_page);
-+ e3b->bd_buddy = NULL;
-+ e3b->bd_bitmap = NULL;
-+ return -EIO;
-+}
-+
-+static void ext3_mb_release_desc(struct ext3_buddy *e3b)
-+{
-+ if (e3b->bd_bitmap_page)
-+ page_cache_release(e3b->bd_bitmap_page);
-+ if (e3b->bd_buddy_page)
-+ page_cache_release(e3b->bd_buddy_page);
-+}
-+
-+
-+static int mb_find_order_for_block(struct ext3_buddy *e3b, int block)
-+{
-+ int order = 1;
-+ void *bb;
-+
-+ BUG_ON(EXT3_MB_BITMAP(e3b) == EXT3_MB_BUDDY(e3b));
-+ BUG_ON(block >= (1 << (e3b->bd_blkbits + 3)));
-+
-+ bb = EXT3_MB_BUDDY(e3b);
-+ while (order <= e3b->bd_blkbits + 1) {
-+ block = block >> 1;
-+ if (!mb_test_bit(block, bb)) {
-+ /* this block is part of buddy of order 'order' */
-+ return order;
-+ }
-+ bb += 1 << (e3b->bd_blkbits - order);
-+ order++;
-+ }
-+ return 0;
-+}
-+
-+static inline void mb_clear_bits(spinlock_t *lock, void *bm, int cur, int len)
-+{
-+ __u32 *addr;
-+
-+ len = cur + len;
-+ while (cur < len) {
-+ if ((cur & 31) == 0 && (len - cur) >= 32) {
-+ /* fast path: clear whole word at once */
-+ addr = bm + (cur >> 3);
-+ *addr = 0;
-+ cur += 32;
-+ continue;
-+ }
-+ mb_clear_bit_atomic(lock, cur, bm);
-+ cur++;
-+ }
-+}
-+
-+static inline void mb_set_bits(spinlock_t *lock, void *bm, int cur, int len)
-+{
-+ __u32 *addr;
-+
-+ len = cur + len;
-+ while (cur < len) {
-+ if ((cur & 31) == 0 && (len - cur) >= 32) {
-+ /* fast path: clear whole word at once */
-+ addr = bm + (cur >> 3);
-+ *addr = 0xffffffff;
-+ cur += 32;
-+ continue;
-+ }
-+ mb_set_bit_atomic(lock, cur, bm);
-+ cur++;
-+ }
-+}
-+
-+static int mb_free_blocks(struct inode *inode, struct ext3_buddy *e3b,
-+ int first, int count)
-+{
-+ int block = 0, max = 0, order;
-+ void *buddy, *buddy2;
-+ struct super_block *sb = e3b->bd_sb;
-+
-+ BUG_ON(first + count > (sb->s_blocksize << 3));
-+ BUG_ON(!ext3_is_group_locked(sb, e3b->bd_group));
-+ mb_check_buddy(e3b);
-+ mb_free_blocks_double(inode, e3b, first, count);
-+
-+ e3b->bd_info->bb_free += count;
-+ if (first < e3b->bd_info->bb_first_free)
-+ e3b->bd_info->bb_first_free = first;
-+
-+ /* let's maintain fragments counter */
-+ if (first != 0)
-+ block = !mb_test_bit(first - 1, EXT3_MB_BITMAP(e3b));
-+ if (first + count < EXT3_SB(sb)->s_mb_maxs[0])
-+ max = !mb_test_bit(first + count, EXT3_MB_BITMAP(e3b));
-+ if (block && max)
-+ e3b->bd_info->bb_fragments--;
-+ else if (!block && !max)
-+ e3b->bd_info->bb_fragments++;
-+
-+ /* let's maintain buddy itself */
-+ while (count-- > 0) {
-+ block = first++;
-+ order = 0;
-+
-+ if (!mb_test_bit(block, EXT3_MB_BITMAP(e3b))) {
-+ unsigned long blocknr;
-+ blocknr = e3b->bd_group * EXT3_BLOCKS_PER_GROUP(sb);
-+ blocknr += block;
-+ blocknr +=
-+ le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block);
-+
-+ ext3_error(sb, __FUNCTION__, "double-free of inode"
-+ " %lu's block %lu(bit %u in group %u)\n",
-+ inode ? inode->i_ino : 0, blocknr, block,
-+ e3b->bd_group);
-+ }
-+ mb_clear_bit(block, EXT3_MB_BITMAP(e3b));
-+ e3b->bd_info->bb_counters[order]++;
-+
-+ /* start of the buddy */
-+ buddy = mb_find_buddy(e3b, order, &max);
-+
-+ do {
-+ block &= ~1UL;
-+ if (mb_test_bit(block, buddy) ||
-+ mb_test_bit(block + 1, buddy))
-+ break;
-+
-+ /* both the buddies are free, try to coalesce them */
-+ buddy2 = mb_find_buddy(e3b, order + 1, &max);
-+
-+ if (!buddy2)
-+ break;
-+
-+ if (order > 0) {
-+ /* for special purposes, we don't set
-+ * free bits in bitmap */
-+ mb_set_bit(block, buddy);
-+ mb_set_bit(block + 1, buddy);
-+ }
-+ e3b->bd_info->bb_counters[order]--;
-+ e3b->bd_info->bb_counters[order]--;
-+
-+ block = block >> 1;
-+ order++;
-+ e3b->bd_info->bb_counters[order]++;
-+
-+ mb_clear_bit(block, buddy2);
-+ buddy = buddy2;
-+ } while (1);
-+ }
-+ mb_check_buddy(e3b);
-+
-+ return 0;
-+}
-+
-+static int mb_find_extent(struct ext3_buddy *e3b, int order, int block,
-+ int needed, struct ext3_free_extent *ex)
-+{
-+ int next = block, max, ord;
-+ void *buddy;
-+
-+ BUG_ON(!ext3_is_group_locked(e3b->bd_sb, e3b->bd_group));
-+ BUG_ON(ex == NULL);
-+
-+ buddy = mb_find_buddy(e3b, order, &max);
-+ BUG_ON(buddy == NULL);
-+ BUG_ON(block >= max);
-+ if (mb_test_bit(block, buddy)) {
-+ ex->fe_len = 0;
-+ ex->fe_start = 0;
-+ ex->fe_group = 0;
-+ return 0;
-+ }
-+
-+ if (likely(order == 0)) {
-+ /* find actual order */
-+ order = mb_find_order_for_block(e3b, block);
-+ block = block >> order;
-+ }
-+
-+ ex->fe_len = 1 << order;
-+ ex->fe_start = block << order;
-+ ex->fe_group = e3b->bd_group;
-+
-+ /* calc difference from given start */
-+ next = next - ex->fe_start;
-+ ex->fe_len -= next;
-+ ex->fe_start += next;
-+
-+ while (needed > ex->fe_len && (buddy = mb_find_buddy(e3b, order, &max))) {
-+
-+ if (block + 1 >= max)
-+ break;
-+
-+ next = (block + 1) * (1 << order);
-+ if (mb_test_bit(next, EXT3_MB_BITMAP(e3b)))
-+ break;
-+
-+ ord = mb_find_order_for_block(e3b, next);
-+
-+ order = ord;
-+ block = next >> order;
-+ ex->fe_len += 1 << order;
-+ }
-+
-+ BUG_ON(ex->fe_start + ex->fe_len > (1 << (e3b->bd_blkbits + 3)));
-+ return ex->fe_len;
-+}
-+
-+static int mb_mark_used(struct ext3_buddy *e3b, struct ext3_free_extent *ex)
-+{
-+ int ord, mlen = 0, max = 0, cur;
-+ int start = ex->fe_start;
-+ int len = ex->fe_len;
-+ unsigned ret = 0;
-+ int len0 = len;
-+ void *buddy;
-+
-+ BUG_ON(start + len > (e3b->bd_sb->s_blocksize << 3));
-+ BUG_ON(e3b->bd_group != ex->fe_group);
-+ BUG_ON(!ext3_is_group_locked(e3b->bd_sb, e3b->bd_group));
-+ mb_check_buddy(e3b);
-+ mb_mark_used_double(e3b, start, len);
-+
-+ e3b->bd_info->bb_free -= len;
-+ if (e3b->bd_info->bb_first_free == start)
-+ e3b->bd_info->bb_first_free += len;
-+
-+ /* let's maintain fragments counter */
-+ if (start != 0)
-+ mlen = !mb_test_bit(start - 1, EXT3_MB_BITMAP(e3b));
-+ if (start + len < EXT3_SB(e3b->bd_sb)->s_mb_maxs[0])
-+ max = !mb_test_bit(start + len, EXT3_MB_BITMAP(e3b));
-+ if (mlen && max)
-+ e3b->bd_info->bb_fragments++;
-+ else if (!mlen && !max)
-+ e3b->bd_info->bb_fragments--;
-+
-+ /* let's maintain buddy itself */
-+ while (len) {
-+ ord = mb_find_order_for_block(e3b, start);
-+
-+ if (((start >> ord) << ord) == start && len >= (1 << ord)) {
-+ /* the whole chunk may be allocated at once! */
-+ mlen = 1 << ord;
-+ buddy = mb_find_buddy(e3b, ord, &max);
-+ BUG_ON((start >> ord) >= max);
-+ mb_set_bit(start >> ord, buddy);
-+ e3b->bd_info->bb_counters[ord]--;
-+ start += mlen;
-+ len -= mlen;
-+ BUG_ON(len < 0);
-+ continue;
-+ }
-+
-+ /* store for history */
-+ if (ret == 0)
-+ ret = len | (ord << 16);
-+
-+ /* we have to split large buddy */
-+ BUG_ON(ord <= 0);
-+ buddy = mb_find_buddy(e3b, ord, &max);
-+ mb_set_bit(start >> ord, buddy);
-+ e3b->bd_info->bb_counters[ord]--;
-+
-+ ord--;
-+ cur = (start >> ord) & ~1U;
-+ buddy = mb_find_buddy(e3b, ord, &max);
-+ mb_clear_bit(cur, buddy);
-+ mb_clear_bit(cur + 1, buddy);
-+ e3b->bd_info->bb_counters[ord]++;
-+ e3b->bd_info->bb_counters[ord]++;
-+ }
-+
-+ mb_set_bits(sb_bgl_lock(EXT3_SB(e3b->bd_sb), ex->fe_group),
-+ EXT3_MB_BITMAP(e3b), ex->fe_start, len0);
-+ mb_check_buddy(e3b);
-+
-+ return ret;
-+}
-+
-+/*
-+ * Must be called under group lock!
-+ */
-+static void ext3_mb_use_best_found(struct ext3_allocation_context *ac,
-+ struct ext3_buddy *e3b)
-+{
-+ unsigned long ret;
-+
-+ BUG_ON(ac->ac_b_ex.fe_group != e3b->bd_group);
-+ BUG_ON(ac->ac_status == AC_STATUS_FOUND);
-+
-+ ac->ac_b_ex.fe_len = min(ac->ac_b_ex.fe_len, ac->ac_g_ex.fe_len);
-+ ac->ac_b_ex.fe_logical = ac->ac_g_ex.fe_logical;
-+ ret = mb_mark_used(e3b, &ac->ac_b_ex);
-+
-+ /* preallocation can change ac_b_ex, thus we store actually
-+ * allocated blocks for history */
-+ ac->ac_f_ex = ac->ac_b_ex;
-+
-+ ac->ac_status = AC_STATUS_FOUND;
-+ ac->ac_tail = ret & 0xffff;
-+ ac->ac_buddy = ret >> 16;
-+
-+ /* XXXXXXX: SUCH A HORRIBLE **CK */
-+ ac->ac_bitmap_page = e3b->bd_bitmap_page;
-+ get_page(ac->ac_bitmap_page);
-+ ac->ac_buddy_page = e3b->bd_buddy_page;
-+ get_page(ac->ac_buddy_page);
-+}
-+
-+/*
-+ * regular allocator, for general purposes allocation
-+ */
-+
-+void ext3_mb_check_limits(struct ext3_allocation_context *ac,
-+ struct ext3_buddy *e3b,
-+ int finish_group)
-+{
-+ struct ext3_sb_info *sbi = EXT3_SB(ac->ac_sb);
-+ struct ext3_free_extent *bex = &ac->ac_b_ex;
-+ struct ext3_free_extent *gex = &ac->ac_g_ex;
-+ struct ext3_free_extent ex;
-+ int max;
-+
-+ /*
-+ * We don't want to scan for a whole year
-+ */
-+ if (ac->ac_found > sbi->s_mb_max_to_scan &&
-+ !(ac->ac_flags & EXT3_MB_HINT_FIRST)) {
-+ ac->ac_status = AC_STATUS_BREAK;
-+ return;
-+ }
-+
-+ /*
-+ * Haven't found good chunk so far, let's continue
-+ */
-+ if (bex->fe_len < gex->fe_len)
-+ return;
-+
-+ if ((finish_group || ac->ac_found > sbi->s_mb_min_to_scan)
-+ && bex->fe_group == e3b->bd_group) {
-+ /* recheck chunk's availability - we don't know
-+ * when it was found (within this lock-unlock
-+ * period or not) */
-+ max = mb_find_extent(e3b, 0, bex->fe_start, gex->fe_len, &ex);
-+ if (max >= gex->fe_len) {
-+ ext3_mb_use_best_found(ac, e3b);
-+ return;
-+ }
-+ }
-+}
-+
-+/*
-+ * The routine checks whether found extent is good enough. If it is,
-+ * then the extent gets marked used and flag is set to the context
-+ * to stop scanning. Otherwise, the extent is compared with the
-+ * previous found extent and if new one is better, then it's stored
-+ * in the context. Later, the best found extent will be used, if
-+ * mballoc can't find good enough extent.
-+ *
-+ * FIXME: real allocation policy is to be designed yet!
-+ */
-+static void ext3_mb_measure_extent(struct ext3_allocation_context *ac,
-+ struct ext3_free_extent *ex,
-+ struct ext3_buddy *e3b)
-+{
-+ struct ext3_free_extent *bex = &ac->ac_b_ex;
-+ struct ext3_free_extent *gex = &ac->ac_g_ex;
-+
-+ BUG_ON(ex->fe_len <= 0);
-+ BUG_ON(ex->fe_len >= EXT3_BLOCKS_PER_GROUP(ac->ac_sb));
-+ BUG_ON(ex->fe_start >= EXT3_BLOCKS_PER_GROUP(ac->ac_sb));
-+ BUG_ON(ac->ac_status != AC_STATUS_CONTINUE);
-+
-+ ac->ac_found++;
-+
-+ /*
-+ * The special case - take what you catch first
-+ */
-+ if (unlikely(ac->ac_flags & EXT3_MB_HINT_FIRST)) {
-+ *bex = *ex;
-+ ext3_mb_use_best_found(ac, e3b);
-+ return;
-+ }
-+
-+ /*
-+ * Let's check whether the chuck is good enough
-+ */
-+ if (ex->fe_len == gex->fe_len) {
-+ *bex = *ex;
-+ ext3_mb_use_best_found(ac, e3b);
-+ return;
-+ }
-+
-+ /*
-+ * If this is first found extent, just store it in the context
-+ */
-+ if (bex->fe_len == 0) {
-+ *bex = *ex;
-+ return;
-+ }
-+
-+ /*
-+ * If new found extent is better, store it in the context
-+ */
-+ if (bex->fe_len < gex->fe_len) {
-+ /* if the request isn't satisfied, any found extent
-+ * larger than previous best one is better */
-+ if (ex->fe_len > bex->fe_len)
-+ *bex = *ex;
-+ } else if (ex->fe_len > gex->fe_len) {
-+ /* if the request is satisfied, then we try to find
-+ * an extent that still satisfy the request, but is
-+ * smaller than previous one */
-+ *bex = *ex;
-+ }
-+
-+ ext3_mb_check_limits(ac, e3b, 0);
-+}
-+
-+static int ext3_mb_try_best_found(struct ext3_allocation_context *ac,
-+ struct ext3_buddy *e3b)
-+{
-+ struct ext3_free_extent ex = ac->ac_b_ex;
-+ int group = ex.fe_group, max, err;
-+
-+ BUG_ON(ex.fe_len <= 0);
-+ err = ext3_mb_load_buddy(ac->ac_sb, group, e3b);
-+ if (err)
-+ return err;
-+
-+ ext3_lock_group(ac->ac_sb, group);
-+ max = mb_find_extent(e3b, 0, ex.fe_start, ex.fe_len, &ex);
-+
-+ if (max > 0) {
-+ ac->ac_b_ex = ex;
-+ ext3_mb_use_best_found(ac, e3b);
-+ }
-+
-+ ext3_unlock_group(ac->ac_sb, group);
-+ ext3_mb_release_desc(e3b);
-+
-+ return 0;
-+}
-+
-+static int ext3_mb_find_by_goal(struct ext3_allocation_context *ac,
-+ struct ext3_buddy *e3b)
-+{
-+ int group = ac->ac_g_ex.fe_group, max, err;
-+ struct ext3_sb_info *sbi = EXT3_SB(ac->ac_sb);
-+ struct ext3_super_block *es = sbi->s_es;
-+ struct ext3_free_extent ex;
-+
-+ err = ext3_mb_load_buddy(ac->ac_sb, group, e3b);
-+ if (err)
-+ return err;
-+
-+ ext3_lock_group(ac->ac_sb, group);
-+ max = mb_find_extent(e3b, 0, ac->ac_g_ex.fe_start,
-+ ac->ac_g_ex.fe_len, &ex);
-+
-+ if (max >= ac->ac_g_ex.fe_len && ac->ac_g_ex.fe_len == sbi->s_stripe) {
-+ unsigned long start;
-+ start = (e3b->bd_group * EXT3_BLOCKS_PER_GROUP(ac->ac_sb) +
-+ ex.fe_start + le32_to_cpu(es->s_first_data_block));
-+ if (start % sbi->s_stripe == 0) {
-+ ac->ac_found++;
-+ ac->ac_b_ex = ex;
-+ ext3_mb_use_best_found(ac, e3b);
-+ }
-+ } else if (max >= ac->ac_g_ex.fe_len) {
-+ BUG_ON(ex.fe_len <= 0);
-+ BUG_ON(ex.fe_group != ac->ac_g_ex.fe_group);
-+ BUG_ON(ex.fe_start != ac->ac_g_ex.fe_start);
-+ ac->ac_found++;
-+ ac->ac_b_ex = ex;
-+ ext3_mb_use_best_found(ac, e3b);
-+ } else if (max > 0 && (ac->ac_flags & EXT3_MB_HINT_MERGE)) {
-+ /* Sometimes, caller may want to merge even small
-+ * number of blocks to an existing extent */
-+ BUG_ON(ex.fe_len <= 0);
-+ BUG_ON(ex.fe_group != ac->ac_g_ex.fe_group);
-+ BUG_ON(ex.fe_start != ac->ac_g_ex.fe_start);
-+ ac->ac_found++;
-+ ac->ac_b_ex = ex;
-+ ext3_mb_use_best_found(ac, e3b);
-+ }
-+ ext3_unlock_group(ac->ac_sb, group);
-+ ext3_mb_release_desc(e3b);
-+
-+ return 0;
-+}
-+
-+/*
-+ * The routine scans buddy structures (not bitmap!) from given order
-+ * to max order and tries to find big enough chunk to satisfy the req
-+ */
-+static void ext3_mb_simple_scan_group(struct ext3_allocation_context *ac,
-+ struct ext3_buddy *e3b)
-+{
-+ struct super_block *sb = ac->ac_sb;
-+ struct ext3_group_info *grp = e3b->bd_info;
-+ void *buddy;
-+ int i, k, max;
-+
-+ BUG_ON(ac->ac_2order <= 0);
-+ for (i = ac->ac_2order; i <= sb->s_blocksize_bits + 1; i++) {
-+ if (grp->bb_counters[i] == 0)
-+ continue;
-+
-+ buddy = mb_find_buddy(e3b, i, &max);
-+ BUG_ON(buddy == NULL);
-+
-+ k = mb_find_next_zero_bit(buddy, max, 0);
-+ BUG_ON(k >= max);
-+
-+ ac->ac_found++;
-+
-+ ac->ac_b_ex.fe_len = 1 << i;
-+ ac->ac_b_ex.fe_start = k << i;
-+ ac->ac_b_ex.fe_group = e3b->bd_group;
-+
-+ ext3_mb_use_best_found(ac, e3b);
-+
-+ BUG_ON(ac->ac_b_ex.fe_len != ac->ac_g_ex.fe_len);
-+
-+ if (EXT3_SB(sb)->s_mb_stats)
-+ atomic_inc(&EXT3_SB(sb)->s_bal_2orders);
-+
-+ break;
-+ }
-+}
-+
-+/*
-+ * The routine scans the group and measures all found extents.
-+ * In order to optimize scanning, caller must pass number of
-+ * free blocks in the group, so the routine can know upper limit.
-+ */
-+static void ext3_mb_complex_scan_group(struct ext3_allocation_context *ac,
-+ struct ext3_buddy *e3b)
-+{
-+ struct super_block *sb = ac->ac_sb;
-+ void *bitmap = EXT3_MB_BITMAP(e3b);
-+ struct ext3_free_extent ex;
-+ int i, free;
-+
-+ free = e3b->bd_info->bb_free;
-+ BUG_ON(free <= 0);
-+
-+ i = e3b->bd_info->bb_first_free;
-+
-+ while (free && ac->ac_status == AC_STATUS_CONTINUE) {
-+ i = mb_find_next_zero_bit(bitmap, EXT3_BLOCKS_PER_GROUP(sb), i);
-+ if (i >= EXT3_BLOCKS_PER_GROUP(sb)) {
-+ BUG_ON(free != 0);
-+ break;
-+ }
-+
-+ mb_find_extent(e3b, 0, i, ac->ac_g_ex.fe_len, &ex);
-+ BUG_ON(ex.fe_len <= 0);
-+ BUG_ON(free < ex.fe_len);
-+
-+ ext3_mb_measure_extent(ac, &ex, e3b);
-+
-+ i += ex.fe_len;
-+ free -= ex.fe_len;
-+ }
-+
-+ ext3_mb_check_limits(ac, e3b, 1);
-+}
-+
-+/*
-+ * This is a special case for storages like raid5
-+ * we try to find stripe-aligned chunks for stripe-size requests
-+ */
-+static void ext3_mb_scan_aligned(struct ext3_allocation_context *ac,
-+ struct ext3_buddy *e3b)
-+{
-+ struct super_block *sb = ac->ac_sb;
-+ struct ext3_sb_info *sbi = EXT3_SB(sb);
-+ void *bitmap = EXT3_MB_BITMAP(e3b);
-+ struct ext3_free_extent ex;
-+ unsigned long i, max;
-+
-+ BUG_ON(sbi->s_stripe == 0);
-+
-+ /* find first stripe-aligned block */
-+ i = e3b->bd_group * EXT3_BLOCKS_PER_GROUP(sb)
-+ + le32_to_cpu(sbi->s_es->s_first_data_block);
-+ i = ((i + sbi->s_stripe - 1) / sbi->s_stripe) * sbi->s_stripe;
-+ i = (i - le32_to_cpu(sbi->s_es->s_first_data_block))
-+ % EXT3_BLOCKS_PER_GROUP(sb);
-+
-+ while (i < EXT3_BLOCKS_PER_GROUP(sb)) {
-+ if (!mb_test_bit(i, bitmap)) {
-+ max = mb_find_extent(e3b, 0, i, sbi->s_stripe, &ex);
-+ if (max >= sbi->s_stripe) {
-+ ac->ac_found++;
-+ ac->ac_b_ex = ex;
-+ ext3_mb_use_best_found(ac, e3b);
-+ break;
-+ }
-+ }
-+ i += sbi->s_stripe;
-+ }
-+}
-+
-+static int ext3_mb_good_group(struct ext3_allocation_context *ac,
-+ int group, int cr)
-+{
-+ struct ext3_group_info *grp = EXT3_GROUP_INFO(ac->ac_sb, group);
-+ unsigned free, fragments, i, bits;
-+
-+ BUG_ON(cr < 0 || cr >= 4);
-+ BUG_ON(EXT3_MB_GRP_NEED_INIT(grp));
-+
-+ free = grp->bb_free;
-+ fragments = grp->bb_fragments;
-+ if (free == 0)
-+ return 0;
-+ if (fragments == 0)
-+ return 0;
-+
-+ switch (cr) {
-+ case 0:
-+ BUG_ON(ac->ac_2order == 0);
-+ bits = ac->ac_sb->s_blocksize_bits + 1;
-+ for (i = ac->ac_2order; i <= bits; i++)
-+ if (grp->bb_counters[i] > 0)
-+ return 1;
-+ break;
-+ case 1:
-+ if ((free / fragments) >= ac->ac_g_ex.fe_len)
-+ return 1;
-+ break;
-+ case 2:
-+ if (free >= ac->ac_g_ex.fe_len)
-+ return 1;
-+ break;
-+ case 3:
-+ return 1;
-+ default:
-+ BUG();
-+ }
-+
-+ return 0;
-+}
-+
-+int ext3_mb_regular_allocator(struct ext3_allocation_context *ac)
-+{
-+ int group, i, cr, err = 0;
-+ struct ext3_sb_info *sbi;
-+ struct super_block *sb;
-+ struct ext3_buddy e3b;
-+
-+ sb = ac->ac_sb;
-+ sbi = EXT3_SB(sb);
-+ BUG_ON(ac->ac_status == AC_STATUS_FOUND);
-+
-+ /* first, try the goal */
-+ err = ext3_mb_find_by_goal(ac, &e3b);
-+ if (err || ac->ac_status == AC_STATUS_FOUND)
-+ goto out;
-+
-+ if (unlikely(ac->ac_flags & EXT3_MB_HINT_GOAL_ONLY))
-+ goto out;
-+
-+ i = ffs(ac->ac_g_ex.fe_len);
-+ ac->ac_2order = 0;
-+ if (i >= sbi->s_mb_order2_reqs) {
-+ i--;
-+ if ((ac->ac_g_ex.fe_len & (~(1 << i))) == 0)
-+ ac->ac_2order = i;
-+ }
-+
-+ group = ac->ac_g_ex.fe_group;
-+
-+ /* Let's just scan groups to find more-less suitable blocks */
-+ cr = ac->ac_2order ? 0 : 1;
-+repeat:
-+ for (; cr < 4 && ac->ac_status == AC_STATUS_CONTINUE; cr++) {
-+ ac->ac_criteria = cr;
-+ for (i = 0; i < EXT3_SB(sb)->s_groups_count; group++, i++) {
-+ struct ext3_group_info *grp;
-+
-+ if (group == EXT3_SB(sb)->s_groups_count)
-+ group = 0;
-+
-+ /* quick check to skip empty groups */
-+ grp = EXT3_GROUP_INFO(ac->ac_sb, group);
-+ if (grp->bb_free == 0)
-+ continue;
-+
-+ if (EXT3_MB_GRP_NEED_INIT(EXT3_GROUP_INFO(sb, group))) {
-+ /* we need full data about the group
-+ * to make a good selection */
-+ err = ext3_mb_load_buddy(sb, group, &e3b);
-+ if (err)
-+ goto out;
-+ ext3_mb_release_desc(&e3b);
-+ }
-+
-+ /* check is group good for our criteries */
-+ if (!ext3_mb_good_group(ac, group, cr))
-+ continue;
-+
-+ err = ext3_mb_load_buddy(sb, group, &e3b);
-+ if (err)
-+ goto out;
-+
-+ ext3_lock_group(sb, group);
-+ if (!ext3_mb_good_group(ac, group, cr)) {
-+ /* someone did allocation from this group */
-+ ext3_unlock_group(sb, group);
-+ ext3_mb_release_desc(&e3b);
-+ continue;
-+ }
-+
-+ ac->ac_groups_scanned++;
-+ if (cr == 0)
-+ ext3_mb_simple_scan_group(ac, &e3b);
-+ else if (cr == 1 && ac->ac_g_ex.fe_len == sbi->s_stripe)
-+ ext3_mb_scan_aligned(ac, &e3b);
-+ else
-+ ext3_mb_complex_scan_group(ac, &e3b);
-+
-+ ext3_unlock_group(sb, group);
-+ ext3_mb_release_desc(&e3b);
-+
-+ if (ac->ac_status != AC_STATUS_CONTINUE)
-+ break;
-+ }
-+ }
-+
-+ if (ac->ac_b_ex.fe_len > 0 && ac->ac_status != AC_STATUS_FOUND &&
-+ !(ac->ac_flags & EXT3_MB_HINT_FIRST)) {
-+ /*
-+ * We've been searching too long. Let's try to allocate
-+ * the best chunk we've found so far
-+ */
-+
-+ ext3_mb_try_best_found(ac, &e3b);
-+ if (ac->ac_status != AC_STATUS_FOUND) {
-+ /*
-+ * Someone more lucky has already allocated it.
-+ * The only thing we can do is just take first
-+ * found block(s)
-+ printk(KERN_DEBUG "EXT3-fs: someone won our chunk\n");
-+ */
-+ ac->ac_b_ex.fe_group = 0;
-+ ac->ac_b_ex.fe_start = 0;
-+ ac->ac_b_ex.fe_len = 0;
-+ ac->ac_status = AC_STATUS_CONTINUE;
-+ ac->ac_flags |= EXT3_MB_HINT_FIRST;
-+ cr = 3;
-+ atomic_inc(&sbi->s_mb_lost_chunks);
-+ goto repeat;
-+ }
-+ }
-+out:
-+ return err;
-+}
-+
-+#ifdef EXT3_MB_HISTORY
-+struct ext3_mb_proc_session {
-+ struct ext3_mb_history *history;
-+ struct super_block *sb;
-+ int start;
-+ int max;
-+};
-+
-+static void *ext3_mb_history_skip_empty(struct ext3_mb_proc_session *s,
-+ struct ext3_mb_history *hs,
-+ int first)
-+{
-+ if (hs == s->history + s->max)
-+ hs = s->history;
-+ if (!first && hs == s->history + s->start)
-+ return NULL;
-+ while (hs->orig.fe_len == 0) {
-+ hs++;
-+ if (hs == s->history + s->max)
-+ hs = s->history;
-+ if (hs == s->history + s->start)
-+ return NULL;
-+ }
-+ return hs;
-+}
-+
-+static void *ext3_mb_seq_history_start(struct seq_file *seq, loff_t *pos)
-+{
-+ struct ext3_mb_proc_session *s = seq->private;
-+ struct ext3_mb_history *hs;
-+ int l = *pos;
-+
-+ if (l == 0)
-+ return SEQ_START_TOKEN;
-+ hs = ext3_mb_history_skip_empty(s, s->history + s->start, 1);
-+ if (!hs)
-+ return NULL;
-+ while (--l && (hs = ext3_mb_history_skip_empty(s, ++hs, 0)) != NULL);
-+ return hs;
-+}
-+
-+static void *ext3_mb_seq_history_next(struct seq_file *seq, void *v, loff_t *pos)
-+{
-+ struct ext3_mb_proc_session *s = seq->private;
-+ struct ext3_mb_history *hs = v;
-+
-+ ++*pos;
-+ if (v == SEQ_START_TOKEN)
-+ return ext3_mb_history_skip_empty(s, s->history + s->start, 1);
-+ else
-+ return ext3_mb_history_skip_empty(s, ++hs, 0);
-+}
-+
-+static int ext3_mb_seq_history_show(struct seq_file *seq, void *v)
-+{
-+ char buf[25], buf2[25], buf3[25], *fmt;
-+ struct ext3_mb_history *hs = v;
-+
-+ if (v == SEQ_START_TOKEN) {
-+ seq_printf(seq, "%-5s %-8s %-23s %-23s %-23s %-5s "
-+ "%-5s %-2s %-5s %-5s %-5s %-6s\n",
-+ "pid", "inode", "original", "goal", "result","found",
-+ "grps", "cr", "flags", "merge", "tail", "broken");
-+ return 0;
-+ }
-+
-+ if (hs->op == EXT3_MB_HISTORY_ALLOC) {
-+ fmt = "%-5u %-8u %-23s %-23s %-23s %-5u %-5u %-2u "
-+ "%-5u %-5s %-5u %-6u\n";
-+ sprintf(buf2, "%lu/%lu/%lu@%lu", hs->result.fe_group,
-+ hs->result.fe_start, hs->result.fe_len,
-+ hs->result.fe_logical);
-+ sprintf(buf, "%lu/%lu/%lu@%lu", hs->orig.fe_group,
-+ hs->orig.fe_start, hs->orig.fe_len,
-+ hs->orig.fe_logical);
-+ sprintf(buf3, "%lu/%lu/%lu@%lu", 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,
-+ hs->found, hs->groups, hs->cr, hs->flags,
-+ hs->merged ? "M" : "", hs->tail,
-+ hs->buddy ? 1 << hs->buddy : 0);
-+ } else if (hs->op == EXT3_MB_HISTORY_PREALLOC) {
-+ fmt = "%-5u %-8u %-23s %-23s %-23s\n";
-+ sprintf(buf2, "%lu/%lu/%lu@%lu", hs->result.fe_group,
-+ hs->result.fe_start, hs->result.fe_len,
-+ hs->result.fe_logical);
-+ sprintf(buf, "%lu/%lu/%lu@%lu", 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 == EXT3_MB_HISTORY_DISCARD) {
-+ sprintf(buf2, "%lu/%lu/%lu", 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 == EXT3_MB_HISTORY_FREE) {
-+ sprintf(buf2, "%lu/%lu/%lu", 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);
-+ }
-+ return 0;
-+}
-+
-+static void ext3_mb_seq_history_stop(struct seq_file *seq, void *v)
-+{
-+}
-+
-+static struct seq_operations ext3_mb_seq_history_ops = {
-+ .start = ext3_mb_seq_history_start,
-+ .next = ext3_mb_seq_history_next,
-+ .stop = ext3_mb_seq_history_stop,
-+ .show = ext3_mb_seq_history_show,
-+};
-+
-+static int ext3_mb_seq_history_open(struct inode *inode, struct file *file)
-+{
-+ struct super_block *sb = PDE(inode)->data;
-+ struct ext3_sb_info *sbi = EXT3_SB(sb);
-+ struct ext3_mb_proc_session *s;
-+ int rc, size;
-+
-+ s = kmalloc(sizeof(*s), GFP_KERNEL);
-+ if (s == NULL)
-+ return -ENOMEM;
-+ s->sb = sb;
-+ size = sizeof(struct ext3_mb_history) * sbi->s_mb_history_max;
-+ s->history = kmalloc(size, GFP_KERNEL);
-+ if (s->history == NULL) {
-+ kfree(s);
-+ return -ENOMEM;
-+ }
-+
-+ spin_lock(&sbi->s_mb_history_lock);
-+ memcpy(s->history, sbi->s_mb_history, size);
-+ s->max = sbi->s_mb_history_max;
-+ s->start = sbi->s_mb_history_cur % s->max;
-+ spin_unlock(&sbi->s_mb_history_lock);
-+
-+ rc = seq_open(file, &ext3_mb_seq_history_ops);
-+ if (rc == 0) {
-+ struct seq_file *m = (struct seq_file *)file->private_data;
-+ m->private = s;
-+ } else {
-+ kfree(s->history);
-+ kfree(s);
-+ }
-+ return rc;
-+
-+}
-+
-+static int ext3_mb_seq_history_release(struct inode *inode, struct file *file)
-+{
-+ struct seq_file *seq = (struct seq_file *)file->private_data;
-+ struct ext3_mb_proc_session *s = seq->private;
-+ kfree(s->history);
-+ kfree(s);
-+ return seq_release(inode, file);
-+}
-+
-+static ssize_t ext3_mb_seq_history_write(struct file *file,
-+ const char __user *buffer,
-+ size_t count, loff_t *ppos)
-+{
-+ struct seq_file *seq = (struct seq_file *)file->private_data;
-+ struct ext3_mb_proc_session *s = seq->private;
-+ struct super_block *sb = s->sb;
-+ char str[32];
-+ int value;
-+
-+ if (count >= sizeof(str)) {
-+ printk(KERN_ERR "EXT3-fs: %s string too long, max %u bytes\n",
-+ "mb_history", (int)sizeof(str));
-+ return -EOVERFLOW;
-+ }
-+
-+ if (copy_from_user(str, buffer, count))
-+ return -EFAULT;
-+
-+ value = simple_strtol(str, NULL, 0);
-+ if (value < 0)
-+ return -ERANGE;
-+ EXT3_SB(sb)->s_mb_history_filter = value;
-+
-+ return count;
-+}
-+
-+static struct file_operations ext3_mb_seq_history_fops = {
-+ .owner = THIS_MODULE,
-+ .open = ext3_mb_seq_history_open,
-+ .read = seq_read,
-+ .write = ext3_mb_seq_history_write,
-+ .llseek = seq_lseek,
-+ .release = ext3_mb_seq_history_release,
-+};
-+
-+static void *ext3_mb_seq_groups_start(struct seq_file *seq, loff_t *pos)
-+{
-+ struct super_block *sb = seq->private;
-+ struct ext3_sb_info *sbi = EXT3_SB(sb);
-+ long group;
-+
-+ if (*pos < 0 || *pos >= sbi->s_groups_count)
-+ return NULL;
-+
-+ group = *pos + 1;
-+ return (void *) group;
-+}
-+
-+static void *ext3_mb_seq_groups_next(struct seq_file *seq, void *v, loff_t *pos)
-+{
-+ struct super_block *sb = seq->private;
-+ struct ext3_sb_info *sbi = EXT3_SB(sb);
-+ long group;
-+
-+ ++*pos;
-+ if (*pos < 0 || *pos >= sbi->s_groups_count)
-+ return NULL;
-+ group = *pos + 1;
-+ return (void *) group;;
-+}
-+
-+static int ext3_mb_seq_groups_show(struct seq_file *seq, void *v)
-+{
-+ struct super_block *sb = seq->private;
-+ long group = (long) v;
-+ int i, err;
-+ struct ext3_buddy e3b;
-+ struct sg {
-+ struct ext3_group_info info;
-+ unsigned short counters[16];
-+ } sg;
-+
-+ group--;
-+ if (group == 0)
-+ seq_printf(seq, "#%-5s: %-5s %-5s %-5s "
-+ "[ %-5s %-5s %-5s %-5s %-5s %-5s %-5s "
-+ "%-5s %-5s %-5s %-5s %-5s %-5s %-5s ]\n",
-+ "group", "free", "frags", "first",
-+ "2^0", "2^1", "2^2", "2^3", "2^4", "2^5","2^6",
-+ "2^7", "2^8", "2^9", "2^10", "2^11", "2^12", "2^13");
-+
-+ i = (sb->s_blocksize_bits + 2) * sizeof(sg.info.bb_counters[0]) +
-+ sizeof(struct ext3_group_info);
-+ err = ext3_mb_load_buddy(sb, group, &e3b);
-+ if (err) {
-+ seq_printf(seq, "#%-5lu: I/O error\n", group);
-+ return 0;
-+ }
-+ ext3_lock_group(sb, group);
-+ memcpy(&sg, EXT3_GROUP_INFO(sb, group), i);
-+ ext3_unlock_group(sb, group);
-+ ext3_mb_release_desc(&e3b);
-+
-+ seq_printf(seq, "#%-5lu: %-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 ?
-+ sg.info.bb_counters[i] : 0);
-+ seq_printf(seq, " ]\n");
-+
-+ return 0;
-+}
-+
-+static void ext3_mb_seq_groups_stop(struct seq_file *seq, void *v)
-+{
-+}
-+
-+static struct seq_operations ext3_mb_seq_groups_ops = {
-+ .start = ext3_mb_seq_groups_start,
-+ .next = ext3_mb_seq_groups_next,
-+ .stop = ext3_mb_seq_groups_stop,
-+ .show = ext3_mb_seq_groups_show,
-+};
-+
-+static int ext3_mb_seq_groups_open(struct inode *inode, struct file *file)
-+{
-+ struct super_block *sb = PDE(inode)->data;
-+ int rc;
-+
-+ rc = seq_open(file, &ext3_mb_seq_groups_ops);
-+ if (rc == 0) {
-+ struct seq_file *m = (struct seq_file *)file->private_data;
-+ m->private = sb;
-+ }
-+ return rc;
-+
-+}
-+
-+static struct file_operations ext3_mb_seq_groups_fops = {
-+ .owner = THIS_MODULE,
-+ .open = ext3_mb_seq_groups_open,
-+ .read = seq_read,
-+ .llseek = seq_lseek,
-+ .release = seq_release,
-+};
-+
-+static void ext3_mb_history_release(struct super_block *sb)
-+{
-+ struct ext3_sb_info *sbi = EXT3_SB(sb);
-+
-+ remove_proc_entry("mb_groups", sbi->s_mb_proc);
-+ remove_proc_entry("mb_history", sbi->s_mb_proc);
-+
-+ if (sbi->s_mb_history)
-+ kfree(sbi->s_mb_history);
-+}
-+
-+static void ext3_mb_history_init(struct super_block *sb)
-+{
-+ struct ext3_sb_info *sbi = EXT3_SB(sb);
-+ int i;
-+
-+ if (sbi->s_mb_proc != NULL) {
-+ struct proc_dir_entry *p;
-+ p = create_proc_entry("mb_history", S_IRUGO, sbi->s_mb_proc);
-+ if (p) {
-+ p->proc_fops = &ext3_mb_seq_history_fops;
-+ p->data = sb;
-+ }
-+ p = create_proc_entry("mb_groups", S_IRUGO, sbi->s_mb_proc);
-+ if (p) {
-+ p->proc_fops = &ext3_mb_seq_groups_fops;
-+ p->data = sb;
-+ }
-+ }
-+
-+ sbi->s_mb_history_max = 1000;
-+ sbi->s_mb_history_cur = 0;
-+ spin_lock_init(&sbi->s_mb_history_lock);
-+ i = sbi->s_mb_history_max * sizeof(struct ext3_mb_history);
-+ sbi->s_mb_history = kmalloc(i, GFP_KERNEL);
-+ if (likely(sbi->s_mb_history != NULL))
-+ memset(sbi->s_mb_history, 0, i);
-+ /* if we can't allocate history, then we simple won't use it */
-+}
-+
-+static void
-+ext3_mb_store_history(struct ext3_allocation_context *ac)
-+{
-+ struct ext3_sb_info *sbi = EXT3_SB(ac->ac_sb);
-+ struct ext3_mb_history h;
-+
-+ if (unlikely(sbi->s_mb_history == NULL))
-+ return;
-+
-+ if (!(ac->ac_op & sbi->s_mb_history_filter))
-+ return;
-+
-+ h.op = ac->ac_op;
-+ h.pid = current->pid;
-+ h.ino = ac->ac_inode ? ac->ac_inode->i_ino : 0;
-+ h.orig = ac->ac_o_ex;
-+ h.result = ac->ac_b_ex;
-+ h.flags = ac->ac_flags;
-+ h.merged = 0;
-+ if (ac->ac_op == EXT3_MB_HISTORY_ALLOC) {
-+ if (ac->ac_g_ex.fe_start == ac->ac_b_ex.fe_start &&
-+ ac->ac_g_ex.fe_group == ac->ac_b_ex.fe_group)
-+ h.merged = 1;
-+ h.goal = ac->ac_g_ex;
-+ h.result = ac->ac_f_ex;
-+ }
-+
-+ spin_lock(&sbi->s_mb_history_lock);
-+ memcpy(sbi->s_mb_history + sbi->s_mb_history_cur, &h, sizeof(h));
-+ if (++sbi->s_mb_history_cur >= sbi->s_mb_history_max)
-+ sbi->s_mb_history_cur = 0;
-+ spin_unlock(&sbi->s_mb_history_lock);
-+}
-+
-+#else
-+#define ext3_mb_history_release(sb)
-+#define ext3_mb_history_init(sb)
-+#endif
-+
-+int ext3_mb_init_backend(struct super_block *sb)
-+{
-+ struct ext3_sb_info *sbi = EXT3_SB(sb);
-+ int i, j, len, metalen;
-+ int num_meta_group_infos =
-+ (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) >>
-+ EXT3_DESC_PER_BLOCK_BITS(sb);
-+ struct ext3_group_info **meta_group_info;
-+
-+ /* An 8TB filesystem with 64-bit pointers requires a 4096 byte
-+ * kmalloc. A 128kb malloc should suffice for a 256TB filesystem.
-+ * So a two level scheme suffices for now. */
-+ sbi->s_group_info = kmalloc(sizeof(*sbi->s_group_info) *
-+ num_meta_group_infos, GFP_KERNEL);
-+ if (sbi->s_group_info == NULL) {
-+ printk(KERN_ERR "EXT3-fs: can't allocate buddy meta group\n");
-+ return -ENOMEM;
-+ }
-+ sbi->s_buddy_cache = new_inode(sb);
-+ if (sbi->s_buddy_cache == NULL) {
-+ printk(KERN_ERR "EXT3-fs: can't get new inode\n");
-+ goto err_freesgi;
-+ }
-+ EXT3_I(sbi->s_buddy_cache)->i_disksize = 0;
-+
-+ metalen = sizeof(*meta_group_info) << EXT3_DESC_PER_BLOCK_BITS(sb);
-+ for (i = 0; i < num_meta_group_infos; i++) {
-+ if ((i + 1) == num_meta_group_infos)
-+ metalen = sizeof(*meta_group_info) *
-+ (sbi->s_groups_count -
-+ (i << EXT3_DESC_PER_BLOCK_BITS(sb)));
-+ meta_group_info = kmalloc(metalen, GFP_KERNEL);
-+ if (meta_group_info == NULL) {
-+ printk(KERN_ERR "EXT3-fs: can't allocate mem for a "
-+ "buddy group\n");
-+ goto err_freemeta;
-+ }
-+ sbi->s_group_info[i] = meta_group_info;
-+ }
-+
-+ /*
-+ * calculate needed size. if change bb_counters size,
-+ * don't forget about ext3_mb_generate_buddy()
-+ */
-+ len = sizeof(struct ext3_group_info);
-+ len += sizeof(unsigned short) * (sb->s_blocksize_bits + 2);
-+ for (i = 0; i < sbi->s_groups_count; i++) {
-+ struct ext3_group_desc * desc;
-+
-+ meta_group_info =
-+ sbi->s_group_info[i >> EXT3_DESC_PER_BLOCK_BITS(sb)];
-+ j = i & (EXT3_DESC_PER_BLOCK(sb) - 1);
-+
-+ meta_group_info[j] = kmalloc(len, GFP_KERNEL);
-+ if (meta_group_info[j] == NULL) {
-+ printk(KERN_ERR "EXT3-fs: can't allocate buddy mem\n");
-+ i--;
-+ goto err_freebuddy;
-+ }
-+ desc = ext3_get_group_desc(sb, i, NULL);
-+ if (desc == NULL) {
-+ printk(KERN_ERR"EXT3-fs: can't read descriptor %u\n",i);
-+ goto err_freebuddy;
-+ }
-+ memset(meta_group_info[j], 0, len);
-+ set_bit(EXT3_GROUP_INFO_NEED_INIT_BIT,
-+ &meta_group_info[j]->bb_state);
-+
-+ /* initialize bb_free to be able to skip
-+ * empty groups without initialization */
-+ meta_group_info[j]->bb_free =
-+ le16_to_cpu(desc->bg_free_blocks_count);
-+
-+ INIT_LIST_HEAD(&meta_group_info[j]->bb_prealloc_list);
-+
-+#ifdef DOUBLE_CHECK
-+ {
-+ struct buffer_head *bh;
-+ meta_group_info[j]->bb_bitmap =
-+ kmalloc(sb->s_blocksize, GFP_KERNEL);
-+ BUG_ON(meta_group_info[j]->bb_bitmap == NULL);
-+ bh = read_block_bitmap(sb, i);
-+ BUG_ON(bh == NULL);
-+ memcpy(meta_group_info[j]->bb_bitmap, bh->b_data,
-+ sb->s_blocksize);
-+ brelse(bh);
-+ }
-+#endif
-+
-+ }
-+
-+ return 0;
-+
-+err_freebuddy:
-+ while (i >= 0) {
-+ kfree(EXT3_GROUP_INFO(sb, i));
-+ i--;
-+ }
-+ i = num_meta_group_infos;
-+err_freemeta:
-+ while (--i >= 0)
-+ kfree(sbi->s_group_info[i]);
-+ iput(sbi->s_buddy_cache);
-+err_freesgi:
-+ kfree(sbi->s_group_info);
-+ return -ENOMEM;
-+}
-+
-+int ext3_mb_init(struct super_block *sb, int needs_recovery)
-+{
-+ struct ext3_sb_info *sbi = EXT3_SB(sb);
-+ unsigned i, offset, max;
-+
-+ if (!test_opt(sb, MBALLOC))
-+ return 0;
-+
-+ i = (sb->s_blocksize_bits + 2) * sizeof(unsigned short);
-+
-+ sbi->s_mb_offsets = kmalloc(i, GFP_KERNEL);
-+ if (sbi->s_mb_offsets == NULL) {
-+ clear_opt(sbi->s_mount_opt, MBALLOC);
-+ return -ENOMEM;
-+ }
-+ sbi->s_mb_maxs = kmalloc(i, GFP_KERNEL);
-+ if (sbi->s_mb_maxs == NULL) {
-+ clear_opt(sbi->s_mount_opt, MBALLOC);
-+ kfree(sbi->s_mb_maxs);
-+ return -ENOMEM;
-+ }
-+
-+ /* order 0 is regular bitmap */
-+ sbi->s_mb_maxs[0] = sb->s_blocksize << 3;
-+ sbi->s_mb_offsets[0] = 0;
-+
-+ i = 1;
-+ offset = 0;
-+ max = sb->s_blocksize << 2;
-+ do {
-+ sbi->s_mb_offsets[i] = offset;
-+ sbi->s_mb_maxs[i] = max;
-+ offset += 1 << (sb->s_blocksize_bits - i);
-+ max = max >> 1;
-+ i++;
-+ } while (i <= sb->s_blocksize_bits + 1);
-+
-+ /* init file for buddy data */
-+ if ((i = ext3_mb_init_backend(sb))) {
-+ clear_opt(sbi->s_mount_opt, MBALLOC);
-+ kfree(sbi->s_mb_offsets);
-+ kfree(sbi->s_mb_maxs);
-+ return i;
-+ }
-+
-+ spin_lock_init(&sbi->s_md_lock);
-+ INIT_LIST_HEAD(&sbi->s_active_transaction);
-+ INIT_LIST_HEAD(&sbi->s_closed_transaction);
-+ INIT_LIST_HEAD(&sbi->s_committed_transaction);
-+ spin_lock_init(&sbi->s_bal_lock);
-+
-+ sbi->s_mb_max_to_scan = MB_DEFAULT_MAX_TO_SCAN;
-+ sbi->s_mb_min_to_scan = MB_DEFAULT_MIN_TO_SCAN;
-+ sbi->s_mb_max_groups_to_scan = MB_DEFAULT_MAX_GROUPS_TO_SCAN;
-+ sbi->s_mb_stats = MB_DEFAULT_STATS;
-+ sbi->s_mb_stream_request = MB_DEFAULT_STREAM_THRESHOLD;
-+ sbi->s_mb_order2_reqs = MB_DEFAULT_ORDER2_REQS;
-+ sbi->s_mb_history_filter = EXT3_MB_HISTORY_DEFAULT;
-+
-+ i = sizeof(struct ext3_locality_group) * NR_CPUS;
-+ sbi->s_locality_groups = kmalloc(i, GFP_NOFS);
-+ if (sbi->s_locality_groups == NULL) {
-+ clear_opt(sbi->s_mount_opt, MBALLOC);
-+ kfree(sbi->s_mb_offsets);
-+ kfree(sbi->s_mb_maxs);
-+ return -ENOMEM;
-+ }
-+ for (i = 0; i < NR_CPUS; i++) {
-+ struct ext3_locality_group *lg;
-+ lg = &sbi->s_locality_groups[i];
-+ sema_init(&lg->lg_sem, 1);
-+ INIT_LIST_HEAD(&lg->lg_prealloc_list);
-+ spin_lock_init(&lg->lg_prealloc_lock);
-+ }
-+
-+ ext3_mb_init_per_dev_proc(sb);
-+ ext3_mb_history_init(sb);
-+
-+ printk("EXT3-fs: mballoc enabled\n");
-+ return 0;
-+}
-+
-+void ext3_mb_cleanup_pa(struct ext3_group_info *grp)
-+{
-+ struct ext3_prealloc_space *pa;
-+ struct list_head *cur, *tmp;
-+ int count = 0;
-+
-+ list_for_each_safe(cur, tmp, &grp->bb_prealloc_list) {
-+ pa = list_entry(cur, struct ext3_prealloc_space, pa_group_list);
-+ list_del_rcu(&pa->pa_group_list);
-+ count++;
-+ kfree(pa);
-+ }
-+ if (count)
-+ mb_debug("mballoc: %u PAs left\n", count);
-+
-+}
-+
-+int ext3_mb_release(struct super_block *sb)
-+{
-+ struct ext3_sb_info *sbi = EXT3_SB(sb);
-+ int i, num_meta_group_infos;
-+
-+ if (!test_opt(sb, MBALLOC))
-+ return 0;
-+
-+ /* release freed, non-committed blocks */
-+ spin_lock(&sbi->s_md_lock);
-+ list_splice_init(&sbi->s_closed_transaction,
-+ &sbi->s_committed_transaction);
-+ list_splice_init(&sbi->s_active_transaction,
-+ &sbi->s_committed_transaction);
-+ spin_unlock(&sbi->s_md_lock);
-+ ext3_mb_free_committed_blocks(sb);
-+
-+ if (sbi->s_group_info) {
-+ for (i = 0; i < sbi->s_groups_count; i++) {
-+#ifdef DOUBLE_CHECK
-+ if (EXT3_GROUP_INFO(sb, i)->bb_bitmap)
-+ kfree(EXT3_GROUP_INFO(sb, i)->bb_bitmap);
-+#endif
-+ ext3_mb_cleanup_pa(EXT3_GROUP_INFO(sb, i));
-+ kfree(EXT3_GROUP_INFO(sb, i));
-+ }
-+ num_meta_group_infos = (sbi->s_groups_count +
-+ EXT3_DESC_PER_BLOCK(sb) - 1) >>
-+ EXT3_DESC_PER_BLOCK_BITS(sb);
-+ for (i = 0; i < num_meta_group_infos; i++)
-+ kfree(sbi->s_group_info[i]);
-+ kfree(sbi->s_group_info);
-+ }
-+ if (sbi->s_mb_offsets)
-+ kfree(sbi->s_mb_offsets);
-+ if (sbi->s_mb_maxs)
-+ kfree(sbi->s_mb_maxs);
-+ if (sbi->s_buddy_cache)
-+ iput(sbi->s_buddy_cache);
-+ if (sbi->s_mb_stats) {
-+ printk("EXT3-fs: mballoc: %u blocks %u reqs (%u success)\n",
-+ atomic_read(&sbi->s_bal_allocated),
-+ atomic_read(&sbi->s_bal_reqs),
-+ atomic_read(&sbi->s_bal_success));
-+ printk("EXT3-fs: mballoc: %u extents scanned, %u goal hits, "
-+ "%u 2^N hits, %u breaks, %u lost\n",
-+ atomic_read(&sbi->s_bal_ex_scanned),
-+ atomic_read(&sbi->s_bal_goals),
-+ atomic_read(&sbi->s_bal_2orders),
-+ atomic_read(&sbi->s_bal_breaks),
-+ atomic_read(&sbi->s_mb_lost_chunks));
-+ printk("EXT3-fs: mballoc: %lu generated and it took %Lu\n",
-+ sbi->s_mb_buddies_generated++,
-+ sbi->s_mb_generation_time);
-+ printk("EXT3-fs: mballoc: %u preallocated, %u discarded\n",
-+ atomic_read(&sbi->s_mb_preallocated),
-+ atomic_read(&sbi->s_mb_discarded));
-+ }
-+
-+ if (sbi->s_locality_groups)
-+ kfree(sbi->s_locality_groups);
-+
-+ ext3_mb_history_release(sb);
-+ ext3_mb_destroy_per_dev_proc(sb);
-+
-+ return 0;
-+}
-+
-+void ext3_mb_free_committed_blocks(struct super_block *sb)
-+{
-+ struct ext3_sb_info *sbi = EXT3_SB(sb);
-+ int err, i, count = 0, count2 = 0;
-+ struct ext3_free_metadata *md;
-+ struct ext3_buddy e3b;
-+
-+ if (list_empty(&sbi->s_committed_transaction))
-+ return;
-+
-+ /* there is committed blocks to be freed yet */
-+ do {
-+ /* get next array of blocks */
-+ md = NULL;
-+ spin_lock(&sbi->s_md_lock);
-+ if (!list_empty(&sbi->s_committed_transaction)) {
-+ md = list_entry(sbi->s_committed_transaction.next,
-+ struct ext3_free_metadata, list);
-+ list_del(&md->list);
-+ }
-+ spin_unlock(&sbi->s_md_lock);
-+
-+ if (md == NULL)
-+ break;
-+
-+ mb_debug("gonna free %u blocks in group %u (0x%p):",
-+ md->num, md->group, md);
-+
-+ err = ext3_mb_load_buddy(sb, md->group, &e3b);
-+ /* we expect to find existing buddy because it's pinned */
-+ BUG_ON(err != 0);
-+
-+ /* there are blocks to put in buddy to make them really free */
-+ count += md->num;
-+ count2++;
-+ ext3_lock_group(sb, md->group);
-+ for (i = 0; i < md->num; i++) {
-+ mb_debug(" %u", md->blocks[i]);
-+ err = mb_free_blocks(NULL, &e3b, md->blocks[i], 1);
-+ BUG_ON(err != 0);
-+ }
-+ mb_debug("\n");
-+ ext3_unlock_group(sb, md->group);
-+
-+ /* balance refcounts from ext3_mb_free_metadata() */
-+ page_cache_release(e3b.bd_buddy_page);
-+ page_cache_release(e3b.bd_bitmap_page);
-+
-+ kfree(md);
-+ ext3_mb_release_desc(&e3b);
-+
-+ } while (md);
-+
-+ mb_debug("freed %u blocks in %u structures\n", count, count2);
-+}
-+
-+#define EXT3_ROOT "ext3"
-+#define EXT3_MB_STATS_NAME "stats"
-+#define EXT3_MB_MAX_TO_SCAN_NAME "max_to_scan"
-+#define EXT3_MB_MIN_TO_SCAN_NAME "min_to_scan"
-+#define EXT3_MB_ORDER2_REQ "order2_req"
-+#define EXT3_MB_STREAM_REQ "stream_req"
-+
-+static int ext3_mb_stats_read(char *page, char **start, off_t off,
-+ int count, int *eof, void *data)
-+{
-+ struct ext3_sb_info *sbi = data;
-+ int len;
-+
-+ *eof = 1;
-+ if (off != 0)
-+ return 0;
-+
-+ len = sprintf(page, "%ld\n", sbi->s_mb_stats);
-+ *start = page;
-+ return len;
-+}
-+
-+static int ext3_mb_stats_write(struct file *file, const char *buffer,
-+ unsigned long count, void *data)
-+{
-+ struct ext3_sb_info *sbi = data;
-+ char str[32];
-+
-+ if (count >= sizeof(str)) {
-+ printk(KERN_ERR "EXT3-fs: %s string too long, max %u bytes\n",
-+ EXT3_MB_STATS_NAME, (int)sizeof(str));
-+ return -EOVERFLOW;
-+ }
-+
-+ if (copy_from_user(str, buffer, count))
-+ return -EFAULT;
-+
-+ /* Only set to 0 or 1 respectively; zero->0; non-zero->1 */
-+ sbi->s_mb_stats = (simple_strtol(str, NULL, 0) != 0);
-+ return count;
-+}
-+
-+static int ext3_mb_max_to_scan_read(char *page, char **start, off_t off,
-+ int count, int *eof, void *data)
-+{
-+ struct ext3_sb_info *sbi = data;
-+ int len;
-+
-+ *eof = 1;
-+ if (off != 0)
-+ return 0;
-+
-+ len = sprintf(page, "%ld\n", sbi->s_mb_max_to_scan);
-+ *start = page;
-+ return len;
-+}
-+
-+static int ext3_mb_max_to_scan_write(struct file *file, const char *buffer,
-+ unsigned long count, void *data)
-+{
-+ struct ext3_sb_info *sbi = data;
-+ char str[32];
-+ long value;
-+
-+ if (count >= sizeof(str)) {
-+ printk(KERN_ERR "EXT3-fs: %s string too long, max %u bytes\n",
-+ EXT3_MB_MAX_TO_SCAN_NAME, (int)sizeof(str));
-+ return -EOVERFLOW;
-+ }
-+
-+ if (copy_from_user(str, buffer, count))
-+ return -EFAULT;
-+
-+ /* Only set to 0 or 1 respectively; zero->0; non-zero->1 */
-+ value = simple_strtol(str, NULL, 0);
-+ if (value <= 0)
-+ return -ERANGE;
-+
-+ sbi->s_mb_max_to_scan = value;
-+
-+ return count;
-+}
-+
-+static int ext3_mb_min_to_scan_read(char *page, char **start, off_t off,
-+ int count, int *eof, void *data)
-+{
-+ struct ext3_sb_info *sbi = data;
-+ int len;
-+
-+ *eof = 1;
-+ if (off != 0)
-+ return 0;
-+
-+ len = sprintf(page, "%ld\n", sbi->s_mb_min_to_scan);
-+ *start = page;
-+ return len;
-+}
-+
-+static int ext3_mb_order2_req_write(struct file *file, const char *buffer,
-+ unsigned long count, void *data)
-+{
-+ struct ext3_sb_info *sbi = data;
-+ char str[32];
-+ long value;
-+
-+ if (count >= sizeof(str)) {
-+ printk(KERN_ERR "EXT3-fs: %s string too long, max %u bytes\n",
-+ EXT3_MB_MIN_TO_SCAN_NAME, (int)sizeof(str));
-+ return -EOVERFLOW;
-+ }
-+
-+ if (copy_from_user(str, buffer, count))
-+ return -EFAULT;
-+
-+ /* Only set to 0 or 1 respectively; zero->0; non-zero->1 */
-+ value = simple_strtol(str, NULL, 0);
-+ if (value <= 0)
-+ return -ERANGE;
-+
-+ sbi->s_mb_order2_reqs = value;
-+
-+ return count;
-+}
-+
-+static int ext3_mb_order2_req_read(char *page, char **start, off_t off,
-+ int count, int *eof, void *data)
-+{
-+ struct ext3_sb_info *sbi = data;
-+ int len;
-+
-+ *eof = 1;
-+ if (off != 0)
-+ return 0;
-+
-+ len = sprintf(page, "%ld\n", sbi->s_mb_order2_reqs);
-+ *start = page;
-+ return len;
-+}
-+
-+static int ext3_mb_min_to_scan_write(struct file *file, const char *buffer,
-+ unsigned long count, void *data)
-+{
-+ struct ext3_sb_info *sbi = data;
-+ char str[32];
-+ long value;
-+
-+ if (count >= sizeof(str)) {
-+ printk(KERN_ERR "EXT3-fs: %s string too long, max %u bytes\n",
-+ EXT3_MB_MIN_TO_SCAN_NAME, (int)sizeof(str));
-+ return -EOVERFLOW;
-+ }
-+
-+ if (copy_from_user(str, buffer, count))
-+ return -EFAULT;
-+
-+ /* Only set to 0 or 1 respectively; zero->0; non-zero->1 */
-+ value = simple_strtol(str, NULL, 0);
-+ if (value <= 0)
-+ return -ERANGE;
-+
-+ sbi->s_mb_min_to_scan = value;
-+
-+ return count;
-+}
-+
-+static int ext3_mb_stream_req_read(char *page, char **start, off_t off,
-+ int count, int *eof, void *data)
-+{
-+ struct ext3_sb_info *sbi = data;
-+ int len;
-+
-+ *eof = 1;
-+ if (off != 0)
-+ return 0;
-+
-+ len = sprintf(page, "%ld\n", sbi->s_mb_stream_request);
-+ *start = page;
-+ return len;
-+}
-+
-+static int ext3_mb_stream_req_write(struct file *file, const char *buffer,
-+ unsigned long count, void *data)
-+{
-+ struct ext3_sb_info *sbi = data;
-+ char str[32];
-+ long value;
-+
-+ if (count >= sizeof(str)) {
-+ printk(KERN_ERR "EXT3-fs: %s string too long, max %u bytes\n",
-+ EXT3_MB_STREAM_REQ, (int)sizeof(str));
-+ return -EOVERFLOW;
-+ }
-+
-+ if (copy_from_user(str, buffer, count))
-+ return -EFAULT;
-+
-+ /* Only set to 0 or 1 respectively; zero->0; non-zero->1 */
-+ value = simple_strtol(str, NULL, 0);
-+ if (value <= 0)
-+ return -ERANGE;
-+
-+ sbi->s_mb_stream_request = value;
-+
-+ return count;
-+}
-+
-+int ext3_mb_init_per_dev_proc(struct super_block *sb)
-+{
-+ mode_t mode = S_IFREG | S_IRUGO | S_IWUSR;
-+ struct ext3_sb_info *sbi = EXT3_SB(sb);
-+ struct proc_dir_entry *proc;
-+ char devname[64], *name;
-+
-+ snprintf(devname, sizeof(devname) - 1, "%s",
-+ bdevname(sb->s_bdev, devname));
-+ sbi->s_mb_proc = proc_mkdir(devname, proc_root_ext3);
-+
-+ name = EXT3_MB_STATS_NAME;
-+ proc = create_proc_entry(name, mode, sbi->s_mb_proc);
-+ if (proc == NULL)
-+ goto err_out;
-+ proc->data = sbi;
-+ proc->read_proc = ext3_mb_stats_read;
-+ proc->write_proc = ext3_mb_stats_write;
-+
-+ name = EXT3_MB_MAX_TO_SCAN_NAME;
-+ proc = create_proc_entry(name, mode, sbi->s_mb_proc);
-+ if (proc == NULL)
-+ goto err_out;
-+ proc->data = sbi;
-+ proc->read_proc = ext3_mb_max_to_scan_read;
-+ proc->write_proc = ext3_mb_max_to_scan_write;
-+
-+ name = EXT3_MB_MIN_TO_SCAN_NAME;
-+ proc = create_proc_entry(name, mode, sbi->s_mb_proc);
-+ if (proc == NULL)
-+ goto err_out;
-+ proc->data = sbi;
-+ proc->read_proc = ext3_mb_min_to_scan_read;
-+ proc->write_proc = ext3_mb_min_to_scan_write;
-+
-+ name = EXT3_MB_ORDER2_REQ;
-+ proc = create_proc_entry(name, mode, sbi->s_mb_proc);
-+ if (proc == NULL)
-+ goto err_out;
-+ proc->data = sbi;
-+ proc->read_proc = ext3_mb_order2_req_read;
-+ proc->write_proc = ext3_mb_order2_req_write;
-+
-+ name = EXT3_MB_STREAM_REQ;
-+ proc = create_proc_entry(name, mode, sbi->s_mb_proc);
-+ if (proc == NULL)
-+ goto err_out;
-+ proc->data = sbi;
-+ proc->read_proc = ext3_mb_stream_req_read;
-+ proc->write_proc = ext3_mb_stream_req_write;
-+
-+ return 0;
-+
-+err_out:
-+ printk(KERN_ERR "EXT3-fs: Unable to create %s\n", name);
-+ remove_proc_entry(EXT3_MB_STREAM_REQ, sbi->s_mb_proc);
-+ remove_proc_entry(EXT3_MB_ORDER2_REQ, sbi->s_mb_proc);
-+ remove_proc_entry(EXT3_MB_MIN_TO_SCAN_NAME, sbi->s_mb_proc);
-+ remove_proc_entry(EXT3_MB_MAX_TO_SCAN_NAME, sbi->s_mb_proc);
-+ remove_proc_entry(EXT3_MB_STATS_NAME, sbi->s_mb_proc);
-+ remove_proc_entry(devname, proc_root_ext3);
-+ sbi->s_mb_proc = NULL;
-+
-+ return -ENOMEM;
-+}
-+
-+int ext3_mb_destroy_per_dev_proc(struct super_block *sb)
-+{
-+ struct ext3_sb_info *sbi = EXT3_SB(sb);
-+ char devname[64];
-+
-+ if (sbi->s_mb_proc == NULL)
-+ return -EINVAL;
-+
-+ snprintf(devname, sizeof(devname) - 1, "%s",
-+ bdevname(sb->s_bdev, devname));
-+ remove_proc_entry(EXT3_MB_STREAM_REQ, sbi->s_mb_proc);
-+ remove_proc_entry(EXT3_MB_ORDER2_REQ, sbi->s_mb_proc);
-+ remove_proc_entry(EXT3_MB_MIN_TO_SCAN_NAME, sbi->s_mb_proc);
-+ remove_proc_entry(EXT3_MB_MAX_TO_SCAN_NAME, sbi->s_mb_proc);
-+ remove_proc_entry(EXT3_MB_STATS_NAME, sbi->s_mb_proc);
-+ remove_proc_entry(devname, proc_root_ext3);
-+
-+ return 0;
-+}
-+
-+int __init init_ext3_proc(void)
-+{
-+ ext3_pspace_cachep =
-+ kmem_cache_create("ext3_prealloc_space",
-+ sizeof(struct ext3_prealloc_space),
-+ 0, SLAB_RECLAIM_ACCOUNT, NULL, NULL);
-+ if (ext3_pspace_cachep == NULL)
-+ return -ENOMEM;
-+
-+ proc_root_ext3 = proc_mkdir(EXT3_ROOT, proc_root_fs);
-+ if (proc_root_ext3 == NULL)
-+ printk(KERN_ERR "EXT3-fs: Unable to create %s\n", EXT3_ROOT);
-+
-+ return 0;
-+}
-+
-+void exit_ext3_proc(void)
-+{
-+ /* XXX: synchronize_rcu(); */
-+ kmem_cache_destroy(ext3_pspace_cachep);
-+ remove_proc_entry(EXT3_ROOT, proc_root_fs);
-+}
-+
-+
-+/*
-+ * Check quota and mark choosed space (ac->ac_b_ex) non-free in bitmaps
-+ * Returns 0 if success or error code
-+ */
-+int ext3_mb_mark_diskspace_used(struct ext3_allocation_context *ac, handle_t *handle)
-+{
-+ struct buffer_head *bitmap_bh = NULL;
-+ struct ext3_super_block *es;
-+ struct ext3_group_desc *gdp;
-+ struct buffer_head *gdp_bh;
-+ struct ext3_sb_info *sbi;
-+ struct super_block *sb;
-+ sector_t block;
-+ int err;
-+
-+ BUG_ON(ac->ac_status != AC_STATUS_FOUND);
-+ BUG_ON(ac->ac_b_ex.fe_len <= 0);
-+
-+ sb = ac->ac_sb;
-+ sbi = EXT3_SB(sb);
-+ es = sbi->s_es;
-+
-+ ext3_debug("using block group %d(%d)\n", ac->ac_b_group.group,
-+ gdp->bg_free_blocks_count);
-+
-+ err = -EIO;
-+ bitmap_bh = read_block_bitmap(sb, ac->ac_b_ex.fe_group);
-+ if (!bitmap_bh)
-+ goto out_err;
-+
-+ err = ext3_journal_get_write_access(handle, bitmap_bh);
-+ if (err)
-+ goto out_err;
-+
-+ err = -EIO;
-+ gdp = ext3_get_group_desc(sb, ac->ac_b_ex.fe_group, &gdp_bh);
-+ if (!gdp)
-+ goto out_err;
-+
-+ err = ext3_journal_get_write_access(handle, gdp_bh);
-+ if (err)
-+ goto out_err;
-+
-+ block = ac->ac_b_ex.fe_group * EXT3_BLOCKS_PER_GROUP(sb)
-+ + ac->ac_b_ex.fe_start
-+ + le32_to_cpu(es->s_first_data_block);
-+
-+ if (block == le32_to_cpu(gdp->bg_block_bitmap) ||
-+ block == le32_to_cpu(gdp->bg_inode_bitmap) ||
-+ in_range(block, le32_to_cpu(gdp->bg_inode_table),
-+ EXT3_SB(sb)->s_itb_per_group))
-+ ext3_error(sb, __FUNCTION__,
-+ "Allocating block in system zone - block = %lu",
-+ (unsigned long) block);
-+#ifdef AGGRESSIVE_CHECK
-+ {
-+ int i;
-+ for (i = 0; i < ac->ac_b_ex.fe_len; i++) {
-+ BUG_ON(mb_test_bit(ac->ac_b_ex.fe_start + i,
-+ bitmap_bh->b_data));
-+ }
-+ }
-+#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));
-+ gdp->bg_free_blocks_count =
-+ cpu_to_le16(le16_to_cpu(gdp->bg_free_blocks_count)
-+ - ac->ac_b_ex.fe_len);
-+ spin_unlock(sb_bgl_lock(sbi, ac->ac_b_ex.fe_group));
-+ percpu_counter_mod(&sbi->s_freeblocks_counter, - ac->ac_b_ex.fe_len);
-+
-+ err = ext3_journal_dirty_metadata(handle, bitmap_bh);
-+ if (err)
-+ goto out_err;
-+ err = ext3_journal_dirty_metadata(handle, gdp_bh);
-+
-+out_err:
-+ sb->s_dirt = 1;
-+ brelse(bitmap_bh);
-+ return err;
-+}
-+
-+/*
-+ * here we normalize request for locality group
-+ * XXX: should we try to preallocate more than the group has now?
-+ */
-+void ext3_mb_normalize_group_request(struct ext3_allocation_context *ac)
-+{
-+ struct super_block *sb = ac->ac_sb;
-+ struct ext3_locality_group *lg = ac->ac_lg;
-+
-+ BUG_ON(lg == NULL);
-+ if (EXT3_SB(sb)->s_stripe)
-+ ac->ac_g_ex.fe_len = EXT3_SB(sb)->s_stripe;
-+ else
-+ ac->ac_g_ex.fe_len = (1024 * 1024) >> sb->s_blocksize_bits;
-+
-+ mb_debug("#%u: goal %u blocks for locality group\n",
-+ current->pid, ac->ac_g_ex.fe_len);
-+}
-+
-+/*
-+ * Normalization means making request better in terms of
-+ * size and alignment
-+ */
-+void ext3_mb_normalize_request(struct ext3_allocation_context *ac,
-+ struct ext3_allocation_request *ar)
-+{
-+ struct ext3_inode_info *ei = EXT3_I(ac->ac_inode);
-+ loff_t start, end, size, orig_size, orig_start;
-+ struct list_head *cur;
-+ int bsbits, max;
-+
-+ /* do normalize only data requests, metadata requests
-+ do not need preallocation */
-+ if (!(ac->ac_flags & EXT3_MB_HINT_DATA))
-+ return;
-+
-+ /* sometime caller may want exact blocks */
-+ if (unlikely(ac->ac_flags & EXT3_MB_HINT_GOAL_ONLY))
-+ return;
-+
-+ /* caller may indicate that preallocation isn't
-+ * required (it's a tail, for example) */
-+ if (ac->ac_flags & EXT3_MB_HINT_NOPREALLOC)
-+ return;
-+
-+ if (ac->ac_flags & EXT3_MB_HINT_GROUP_ALLOC)
-+ return ext3_mb_normalize_group_request(ac);
-+
-+ bsbits = ac->ac_sb->s_blocksize_bits;
-+
-+ /* first, let's learn actual file size
-+ * given current request is allocated */
-+ size = ac->ac_o_ex.fe_logical + ac->ac_o_ex.fe_len;
-+ size = size << bsbits;
-+ if (size < i_size_read(ac->ac_inode))
-+ size = i_size_read(ac->ac_inode);
-+
-+ /* max available blocks in a free group */
-+ max = EXT3_BLOCKS_PER_GROUP(ac->ac_sb) - 1 - 1
-+ - EXT3_SB(ac->ac_sb)->s_itb_per_group;
-+
-+#define NRL_CHECK_SIZE(req,size,max,bits) \
-+ (req <= (size) || max <= ((size) >> bits))
-+
-+ /* first, try to predict filesize */
-+ /* XXX: should this table be tunable? */
-+ start = 0;
-+ if (size <= 16 * 1024) {
-+ size = 16 * 1024;
-+ } else if (size <= 32 * 1024) {
-+ size = 32 * 1024;
-+ } else if (size <= 64 * 1024) {
-+ size = 64 * 1024;
-+ } else if (size <= 128 * 1024) {
-+ size = 128 * 1024;
-+ } else if (size <= 256 * 1024) {
-+ size = 256 * 1024;
-+ } else if (size <= 512 * 1024) {
-+ size = 512 * 1024;
-+ } else if (size <= 1024 * 1024) {
-+ size = 1024 * 1024;
-+ } else if (NRL_CHECK_SIZE(size, 4 * 1024 * 1024, max, bsbits)) {
-+ start = ac->ac_o_ex.fe_logical << bsbits;
-+ start = (start / (1024 * 1024)) * (1024 * 1024);
-+ size = 1024 * 1024;
-+ } else if (NRL_CHECK_SIZE(size, 8 * 1024 * 1024, max, bsbits)) {
-+ start = ac->ac_o_ex.fe_logical << bsbits;
-+ start = (start / (4 * (1024 * 1024))) * 4 * (1024 * 1024);
-+ size = 4 * 1024 * 1024;
-+ } else if(NRL_CHECK_SIZE(ac->ac_o_ex.fe_len,(8<<20)>>bsbits,max,bsbits)){
-+ start = ac->ac_o_ex.fe_logical;
-+ start = start << bsbits;
-+ start = (start / (8 * (1024 * 1024))) * 8 * (1024 * 1024);
-+ size = 8 * 1024 * 1024;
-+ } else {
-+ start = ac->ac_o_ex.fe_logical;
-+ start = start << bsbits;
-+ size = ac->ac_o_ex.fe_len << bsbits;
-+ }
-+ orig_size = size = size >> bsbits;
-+ orig_start = start = start >> bsbits;
-+
-+ /* don't cover already allocated blocks in selected range */
-+ if (ar->pleft && start <= ar->lleft) {
-+ size -= ar->lleft + 1 - start;
-+ start = ar->lleft + 1;
-+ }
-+ if (ar->pright && start + size - 1 >= ar->lright)
-+ size -= start + size - ar->lright;
-+
-+ end = start + size;
-+
-+ /* check we don't cross already preallocated blocks */
-+ rcu_read_lock();
-+ list_for_each_rcu(cur, &ei->i_prealloc_list) {
-+ struct ext3_prealloc_space *pa;
-+ unsigned long pa_end;
-+
-+ pa = list_entry(cur, struct ext3_prealloc_space, pa_inode_list);
-+
-+ if (pa->pa_deleted)
-+ continue;
-+ spin_lock(&pa->pa_lock);
-+ if (pa->pa_deleted) {
-+ spin_unlock(&pa->pa_lock);
-+ continue;
-+ }
-+
-+ pa_end = pa->pa_lstart + pa->pa_len;
-+
-+ /* PA must not overlap original request */
-+ BUG_ON(!(ac->ac_o_ex.fe_logical >= pa_end ||
-+ ac->ac_o_ex.fe_logical < pa->pa_lstart));
-+
-+ /* skip PA normalized request doesn't overlap with */
-+ if (pa->pa_lstart >= end) {
-+ spin_unlock(&pa->pa_lock);
-+ continue;
-+ }
-+ if (pa_end <= start) {
-+ spin_unlock(&pa->pa_lock);
-+ continue;
-+ }
-+ BUG_ON(pa->pa_lstart <= start && pa_end >= end);
-+
-+ if (pa_end <= ac->ac_o_ex.fe_logical) {
-+ BUG_ON(pa_end < start);
-+ start = pa_end;
-+ }
-+
-+ if (pa->pa_lstart > ac->ac_o_ex.fe_logical) {
-+ BUG_ON(pa->pa_lstart > end);
-+ end = pa->pa_lstart;
-+ }
-+ spin_unlock(&pa->pa_lock);
-+ }
-+ rcu_read_unlock();
-+ size = end - start;
-+
-+ /* XXX: extra loop to check we really don't overlap preallocations */
-+ rcu_read_lock();
-+ list_for_each_rcu(cur, &ei->i_prealloc_list) {
-+ struct ext3_prealloc_space *pa;
-+ unsigned long pa_end;
-+ pa = list_entry(cur, struct ext3_prealloc_space, pa_inode_list);
-+ spin_lock(&pa->pa_lock);
-+ if (pa->pa_deleted == 0) {
-+ pa_end = pa->pa_lstart + pa->pa_len;
-+ BUG_ON(!(start >= pa_end || end <= pa->pa_lstart));
-+ }
-+ spin_unlock(&pa->pa_lock);
-+ }
-+ rcu_read_unlock();
-+
-+ if (start + size <= ac->ac_o_ex.fe_logical &&
-+ start > ac->ac_o_ex.fe_logical) {
-+ printk("start %lu, size %lu, fe_logical %lu\n",
-+ (unsigned long) start, (unsigned long) size,
-+ (unsigned long) ac->ac_o_ex.fe_logical);
-+ }
-+ BUG_ON(start + size <= ac->ac_o_ex.fe_logical &&
-+ start > ac->ac_o_ex.fe_logical);
-+
-+ /* now prepare goal request */
-+ BUG_ON(size <= 0 || size >= EXT3_BLOCKS_PER_GROUP(ac->ac_sb));
-+ if (size < ac->ac_o_ex.fe_len) {
-+ /* XXX: don't normalize tails? */
-+ }
-+
-+ /* XXX: is it better to align blocks WRT to logical placement
-+ * or satisfy big request as is */
-+ ac->ac_g_ex.fe_logical = start;
-+ ac->ac_g_ex.fe_len = size;
-+
-+ mb_debug("goal: %u(was %u) blocks at %u\n", (unsigned) size,
-+ (unsigned) orig_size, (unsigned) start);
-+}
-+
-+void ext3_mb_collect_stats(struct ext3_allocation_context *ac)
-+{
-+ struct ext3_sb_info *sbi = EXT3_SB(ac->ac_sb);
-+
-+ if (sbi->s_mb_stats && ac->ac_g_ex.fe_len > 1) {
-+ atomic_inc(&sbi->s_bal_reqs);
-+ atomic_add(ac->ac_b_ex.fe_len, &sbi->s_bal_allocated);
-+ if (ac->ac_o_ex.fe_len >= ac->ac_g_ex.fe_len)
-+ atomic_inc(&sbi->s_bal_success);
-+ atomic_add(ac->ac_found, &sbi->s_bal_ex_scanned);
-+ if (ac->ac_g_ex.fe_start == ac->ac_b_ex.fe_start &&
-+ ac->ac_g_ex.fe_group == ac->ac_b_ex.fe_group)
-+ atomic_inc(&sbi->s_bal_goals);
-+ if (ac->ac_found > sbi->s_mb_max_to_scan)
-+ atomic_inc(&sbi->s_bal_breaks);
-+ }
-+
-+ ext3_mb_store_history(ac);
-+}
-+
-+/*
-+ * use blocks preallocated to inode
-+ */
-+void ext3_mb_use_inode_pa(struct ext3_allocation_context *ac,
-+ struct ext3_prealloc_space *pa)
-+{
-+ unsigned long start, len;
-+
-+ /* found preallocated blocks, use them */
-+ start = pa->pa_pstart + (ac->ac_o_ex.fe_logical - pa->pa_lstart);
-+ len = min(pa->pa_pstart + pa->pa_len, start + ac->ac_o_ex.fe_len);
-+ len = len - start;
-+ ext3_get_group_no_and_offset(ac->ac_sb, start, &ac->ac_b_ex.fe_group,
-+ &ac->ac_b_ex.fe_start);
-+ ac->ac_b_ex.fe_len = len;
-+ ac->ac_status = AC_STATUS_FOUND;
-+ ac->ac_pa = pa;
-+
-+ BUG_ON(start < pa->pa_pstart);
-+ BUG_ON(start + len > pa->pa_pstart + pa->pa_len);
-+ BUG_ON(pa->pa_free < len);
-+ pa->pa_free -= len;
-+
-+ mb_debug("use %lu/%lu from inode pa %p\n", start, len, pa);
-+}
-+
-+/*
-+ * use blocks preallocated to locality group
-+ */
-+void ext3_mb_use_group_pa(struct ext3_allocation_context *ac,
-+ struct ext3_prealloc_space *pa)
-+{
-+ unsigned len = ac->ac_o_ex.fe_len;
-+
-+ ext3_get_group_no_and_offset(ac->ac_sb, pa->pa_pstart,
-+ &ac->ac_b_ex.fe_group,
-+ &ac->ac_b_ex.fe_start);
-+ ac->ac_b_ex.fe_len = len;
-+ ac->ac_status = AC_STATUS_FOUND;
-+ ac->ac_pa = pa;
-+
-+ /* we don't correct pa_pstart or pa_plen here to avoid
-+ * possible race when tte group is being loaded concurrently
-+ * instead we correct pa later, after blocks are marked
-+ * in on-disk bitmap -- see ext3_mb_release_context() */
-+ mb_debug("use %lu/%lu from group pa %p\n", pa->pa_lstart-len, len, pa);
-+}
-+
-+/*
-+ * search goal blocks in preallocated space
-+ */
-+int ext3_mb_use_preallocated(struct ext3_allocation_context *ac)
-+{
-+ struct ext3_inode_info *ei = EXT3_I(ac->ac_inode);
-+ struct ext3_locality_group *lg;
-+ struct ext3_prealloc_space *pa;
-+ struct list_head *cur;
-+
-+ /* only data can be preallocated */
-+ if (!(ac->ac_flags & EXT3_MB_HINT_DATA))
-+ return 0;
-+
-+ /* first, try per-file preallocation */
-+ rcu_read_lock();
-+ list_for_each_rcu(cur, &ei->i_prealloc_list) {
-+ pa = list_entry(cur, struct ext3_prealloc_space, pa_inode_list);
-+
-+ /* all fields in this condition don't change,
-+ * so we can skip locking for them */
-+ if (ac->ac_o_ex.fe_logical < pa->pa_lstart ||
-+ ac->ac_o_ex.fe_logical >= pa->pa_lstart + pa->pa_len)
-+ continue;
-+
-+ /* found preallocated blocks, use them */
-+ spin_lock(&pa->pa_lock);
-+ if (pa->pa_deleted == 0 && pa->pa_free) {
-+ atomic_inc(&pa->pa_count);
-+ ext3_mb_use_inode_pa(ac, pa);
-+ spin_unlock(&pa->pa_lock);
-+ ac->ac_criteria = 10;
-+ rcu_read_unlock();
-+ return 1;
-+ }
-+ spin_unlock(&pa->pa_lock);
-+ }
-+ rcu_read_unlock();
-+
-+ /* can we use group allocation? */
-+ if (!(ac->ac_flags & EXT3_MB_HINT_GROUP_ALLOC))
-+ return 0;
-+
-+ /* inode may have no locality group for some reason */
-+ lg = ac->ac_lg;
-+ if (lg == NULL)
-+ return 0;
-+
-+ rcu_read_lock();
-+ list_for_each_rcu(cur, &lg->lg_prealloc_list) {
-+ pa = list_entry(cur, struct ext3_prealloc_space, pa_inode_list);
-+ spin_lock(&pa->pa_lock);
-+ if (pa->pa_deleted == 0 && pa->pa_free >= ac->ac_o_ex.fe_len) {
-+ atomic_inc(&pa->pa_count);
-+ ext3_mb_use_group_pa(ac, pa);
-+ spin_unlock(&pa->pa_lock);
-+ ac->ac_criteria = 20;
-+ rcu_read_unlock();
-+ return 1;
-+ }
-+ spin_unlock(&pa->pa_lock);
-+ }
-+ rcu_read_unlock();
-+
-+ return 0;
-+}
-+
-+/*
-+ * the function goes through all preallocation in this group and marks them
-+ * used in in-core bitmap. buddy must be generated from this bitmap
-+ */
-+void ext3_mb_generate_from_pa(struct super_block *sb, void *bitmap, int group)
-+{
-+ struct ext3_group_info *grp = EXT3_GROUP_INFO(sb, group);
-+ struct ext3_prealloc_space *pa;
-+ struct list_head *cur;
-+ unsigned long groupnr;
-+ unsigned long start;
-+ int preallocated = 0, count = 0, len;
-+
-+ /* all form of preallocation discards first load group,
-+ * so the only competing code is preallocation use.
-+ * we don't need any locking here
-+ * notice we do NOT ignore preallocations with pa_deleted
-+ * otherwise we could leave used blocks available for
-+ * allocation in buddy when concurrent ext3_mb_put_pa()
-+ * is dropping preallocation
-+ */
-+ list_for_each_rcu(cur, &grp->bb_prealloc_list) {
-+ pa = list_entry(cur, struct ext3_prealloc_space, pa_group_list);
-+ spin_lock(&pa->pa_lock);
-+ ext3_get_group_no_and_offset(sb, pa->pa_pstart, &groupnr, &start);
-+ len = pa->pa_len;
-+ spin_unlock(&pa->pa_lock);
-+ if (unlikely(len == 0))
-+ continue;
-+ BUG_ON(groupnr != group && len != 0);
-+ mb_set_bits(sb_bgl_lock(EXT3_SB(sb), group), bitmap, start,len);
-+ preallocated += len;
-+ count++;
-+ }
-+ mb_debug("prellocated %u for group %u\n", preallocated, group);
-+}
-+
-+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,5)
-+static void ext3_mb_pa_callback(struct rcu_head *head)
-+{
-+ struct ext3_prealloc_space *pa;
-+ pa = container_of(head, struct ext3_prealloc_space, u.pa_rcu);
-+ kmem_cache_free(ext3_pspace_cachep, pa);
-+}
-+#define mb_call_rcu(__pa) call_rcu(&(__pa)->u.pa_rcu, ext3_mb_pa_callback)
-+#else
-+static void ext3_mb_pa_callback(void *pa)
-+{
-+ kmem_cache_free(ext3_pspace_cachep, pa);
-+}
-+#define mb_call_rcu(__pa) call_rcu(&(__pa)->u.pa_rcu, ext3_mb_pa_callback, pa)
-+#endif
-+
-+/*
-+ * drops a reference to preallocated space descriptor
-+ * if this was the last reference and the space is consumed
-+ */
-+void ext3_mb_put_pa(struct ext3_allocation_context *ac,
-+ struct super_block *sb, struct ext3_prealloc_space *pa)
-+{
-+ unsigned long grp;
-+
-+ if (!atomic_dec_and_test(&pa->pa_count) || pa->pa_free != 0)
-+ return;
-+
-+ /* in this short window concurrent discard can set pa_deleted */
-+ spin_lock(&pa->pa_lock);
-+ if (pa->pa_deleted == 0) {
-+ spin_unlock(&pa->pa_lock);
-+ return;
-+ }
-+
-+ pa->pa_deleted = 1;
-+ spin_unlock(&pa->pa_lock);
-+
-+ /* -1 is to protect from crossing allocation group */
-+ ext3_get_group_no_and_offset(sb, pa->pa_pstart - 1, &grp, NULL);
-+
-+ /*
-+ * possible race:
-+ *
-+ * P1 (buddy init) P2 (regular allocation)
-+ * find block B in PA
-+ * copy on-disk bitmap to buddy
-+ * mark B in on-disk bitmap
-+ * drop PA from group
-+ * mark all PAs in buddy
-+ *
-+ * thus, P1 initializes buddy with B available. to prevent this
-+ * we make "copy" and "mark all PAs" atomic and serialize "drop PA"
-+ * against that pair
-+ */
-+ ext3_lock_group(sb, grp);
-+ list_del_rcu(&pa->pa_group_list);
-+ ext3_unlock_group(sb, grp);
-+
-+ spin_lock(pa->pa_obj_lock);
-+ list_del_rcu(&pa->pa_inode_list);
-+ spin_unlock(pa->pa_obj_lock);
-+
-+ mb_call_rcu(pa);
-+}
-+
-+/*
-+ * creates new preallocated space for given inode
-+ */
-+int ext3_mb_new_inode_pa(struct ext3_allocation_context *ac)
-+{
-+ struct super_block *sb = ac->ac_sb;
-+ struct ext3_prealloc_space *pa;
-+ struct ext3_group_info *grp;
-+ struct ext3_inode_info *ei;
-+
-+ /* preallocate only when found space is larger then requested */
-+ BUG_ON(ac->ac_o_ex.fe_len >= ac->ac_b_ex.fe_len);
-+ BUG_ON(ac->ac_status != AC_STATUS_FOUND);
-+ BUG_ON(!S_ISREG(ac->ac_inode->i_mode));
-+
-+ pa = kmem_cache_alloc(ext3_pspace_cachep, GFP_NOFS);
-+ if (pa == NULL)
-+ return -ENOMEM;
-+
-+ if (ac->ac_b_ex.fe_len < ac->ac_g_ex.fe_len) {
-+ int winl, wins, win, offs;
-+
-+ /* we can't allocate as much as normalizer wants.
-+ * so, found space must get proper lstart
-+ * to cover original request */
-+ BUG_ON(ac->ac_g_ex.fe_logical > ac->ac_o_ex.fe_logical);
-+ BUG_ON(ac->ac_g_ex.fe_len < ac->ac_o_ex.fe_len);
-+
-+ /* we're limited by original request in that
-+ * logical block must be covered any way
-+ * winl is window we can move our chunk within */
-+ winl = ac->ac_o_ex.fe_logical - ac->ac_g_ex.fe_logical;
-+
-+ /* also, we should cover whole original request */
-+ wins = ac->ac_b_ex.fe_len - ac->ac_o_ex.fe_len;
-+
-+ /* the smallest one defines real window */
-+ win = min(winl, wins);
-+
-+ offs = ac->ac_o_ex.fe_logical % ac->ac_b_ex.fe_len;
-+ if (offs && offs < win)
-+ win = offs;
-+
-+ ac->ac_b_ex.fe_logical = ac->ac_o_ex.fe_logical - win;
-+ BUG_ON(ac->ac_o_ex.fe_logical < ac->ac_b_ex.fe_logical);
-+ BUG_ON(ac->ac_o_ex.fe_len > ac->ac_b_ex.fe_len);
-+ }
-+
-+ /* preallocation can change ac_b_ex, thus we store actually
-+ * allocated blocks for history */
-+ ac->ac_f_ex = ac->ac_b_ex;
-+
-+ pa->pa_lstart = ac->ac_b_ex.fe_logical;
-+ pa->pa_pstart = ext3_grp_offs_to_block(sb, &ac->ac_b_ex);
-+ pa->pa_len = ac->ac_b_ex.fe_len;
-+ pa->pa_free = pa->pa_len;
-+ atomic_set(&pa->pa_count, 1);
-+ spin_lock_init(&pa->pa_lock);
-+ pa->pa_deleted = 0;
-+ pa->pa_linear = 0;
-+
-+ mb_debug("new inode pa %p: %lu/%lu for %lu\n", pa,
-+ pa->pa_pstart, pa->pa_len, pa->pa_lstart);
-+
-+ ext3_mb_use_inode_pa(ac, pa);
-+ atomic_add(pa->pa_free, &EXT3_SB(sb)->s_mb_preallocated);
-+
-+ ei = EXT3_I(ac->ac_inode);
-+ grp = EXT3_GROUP_INFO(sb, ac->ac_b_ex.fe_group);
-+
-+ pa->pa_obj_lock = &ei->i_prealloc_lock;
-+ pa->pa_inode = ac->ac_inode;
-+
-+ ext3_lock_group(sb, ac->ac_b_ex.fe_group);
-+ list_add_rcu(&pa->pa_group_list, &grp->bb_prealloc_list);
-+ ext3_unlock_group(sb, ac->ac_b_ex.fe_group);
-+
-+ spin_lock(pa->pa_obj_lock);
-+ list_add_rcu(&pa->pa_inode_list, &ei->i_prealloc_list);
-+ spin_unlock(pa->pa_obj_lock);
-+
-+ return 0;
-+}
-+
-+/*
-+ * creates new preallocated space for locality group inodes belongs to
-+ */
-+int ext3_mb_new_group_pa(struct ext3_allocation_context *ac)
-+{
-+ struct super_block *sb = ac->ac_sb;
-+ struct ext3_locality_group *lg;
-+ struct ext3_prealloc_space *pa;
-+ struct ext3_group_info *grp;
-+
-+ /* preallocate only when found space is larger then requested */
-+ BUG_ON(ac->ac_o_ex.fe_len >= ac->ac_b_ex.fe_len);
-+ BUG_ON(ac->ac_status != AC_STATUS_FOUND);
-+ BUG_ON(!S_ISREG(ac->ac_inode->i_mode));
-+
-+ BUG_ON(ext3_pspace_cachep == NULL);
-+ pa = kmem_cache_alloc(ext3_pspace_cachep, GFP_NOFS);
-+ if (pa == NULL)
-+ return -ENOMEM;
-+
-+ /* preallocation can change ac_b_ex, thus we store actually
-+ * allocated blocks for history */
-+ ac->ac_f_ex = ac->ac_b_ex;
-+
-+ pa->pa_pstart = ext3_grp_offs_to_block(sb, &ac->ac_b_ex);
-+ pa->pa_lstart = pa->pa_pstart;
-+ pa->pa_len = ac->ac_b_ex.fe_len;
-+ pa->pa_free = pa->pa_len;
-+ atomic_set(&pa->pa_count, 1);
-+ spin_lock_init(&pa->pa_lock);
-+ pa->pa_deleted = 0;
-+ pa->pa_linear = 1;
-+
-+ mb_debug("new group pa %p: %lu/%lu for %lu\n", pa,
-+ pa->pa_pstart, pa->pa_len, pa->pa_lstart);
-+
-+ ext3_mb_use_group_pa(ac, pa);
-+ atomic_add(pa->pa_free, &EXT3_SB(sb)->s_mb_preallocated);
-+
-+ grp = EXT3_GROUP_INFO(sb, ac->ac_b_ex.fe_group);
-+ lg = ac->ac_lg;
-+ BUG_ON(lg == NULL);
-+
-+ pa->pa_obj_lock = &lg->lg_prealloc_lock;
-+ pa->pa_inode = NULL;
-+
-+ ext3_lock_group(sb, ac->ac_b_ex.fe_group);
-+ list_add_rcu(&pa->pa_group_list, &grp->bb_prealloc_list);
-+ ext3_unlock_group(sb, ac->ac_b_ex.fe_group);
-+
-+ spin_lock(pa->pa_obj_lock);
-+ list_add_tail_rcu(&pa->pa_inode_list, &lg->lg_prealloc_list);
-+ spin_unlock(pa->pa_obj_lock);
-+
-+ return 0;
-+}
-+
-+int ext3_mb_new_preallocation(struct ext3_allocation_context *ac)
-+{
-+ int err;
-+
-+ if (ac->ac_flags & EXT3_MB_HINT_GROUP_ALLOC)
-+ err = ext3_mb_new_group_pa(ac);
-+ else
-+ err = ext3_mb_new_inode_pa(ac);
-+ return err;
-+}
-+
-+/*
-+ * finds all unused blocks in on-disk bitmap, frees them in
-+ * in-core bitmap and buddy.
-+ * @pa must be unlinked from inode and group lists, so that
-+ * nobody else can find/use it.
-+ * the caller MUST hold group/inode locks.
-+ * TODO: optimize the case when there are no in-core structures yet
-+ */
-+int ext3_mb_release_inode_pa(struct ext3_buddy *e3b,
-+ struct buffer_head *bitmap_bh,
-+ struct ext3_prealloc_space *pa)
-+{
-+ struct ext3_allocation_context ac;
-+ struct super_block *sb = e3b->bd_sb;
-+ struct ext3_sb_info *sbi = EXT3_SB(sb);
-+ unsigned long bit, end, next, group;
-+ sector_t start;
-+ int err = 0, free = 0;
-+
-+ BUG_ON(pa->pa_deleted == 0);
-+ ext3_get_group_no_and_offset(sb, pa->pa_pstart, &group, &bit);
-+ BUG_ON(group != e3b->bd_group && pa->pa_len != 0);
-+ end = bit + pa->pa_len;
-+
-+ ac.ac_sb = sb;
-+ ac.ac_inode = pa->pa_inode;
-+ ac.ac_op = EXT3_MB_HISTORY_DISCARD;
-+
-+ while (bit < end) {
-+ bit = mb_find_next_zero_bit(bitmap_bh->b_data, end, bit);
-+ if (bit >= end)
-+ break;
-+ next = mb_find_next_bit(bitmap_bh->b_data, end, bit);
-+ if (next > end)
-+ next = end;
-+ start = group * EXT3_BLOCKS_PER_GROUP(sb) + bit +
-+ le32_to_cpu(sbi->s_es->s_first_data_block);
-+ mb_debug(" free preallocated %u/%u in group %u\n",
-+ (unsigned) start, (unsigned) next - bit,
-+ (unsigned) group);
-+ free += next - bit;
-+
-+ ac.ac_b_ex.fe_group = group;
-+ ac.ac_b_ex.fe_start = bit;
-+ ac.ac_b_ex.fe_len = next - bit;
-+ ac.ac_b_ex.fe_logical = 0;
-+ ext3_mb_store_history(&ac);
-+
-+ mb_free_blocks(pa->pa_inode, e3b, bit, next - bit);
-+ bit = next + 1;
-+ }
-+ if (free != pa->pa_free) {
-+ printk("pa %p: logic %lu, phys. %lu, len %lu\n",
-+ pa, (unsigned long) pa->pa_lstart,
-+ (unsigned long) pa->pa_pstart,
-+ (unsigned long) pa->pa_len);
-+ printk("free %u, pa_free %u\n", free, pa->pa_free);
-+ }
-+ BUG_ON(free != pa->pa_free);
-+ atomic_add(free, &sbi->s_mb_discarded);
-+
-+ return err;
-+}
-+
-+int ext3_mb_release_group_pa(struct ext3_buddy *e3b,
-+ struct ext3_prealloc_space *pa)
-+{
-+ struct ext3_allocation_context ac;
-+ struct super_block *sb = e3b->bd_sb;
-+ unsigned long bit, group;
-+
-+ ac.ac_op = EXT3_MB_HISTORY_DISCARD;
-+
-+ BUG_ON(pa->pa_deleted == 0);
-+ ext3_get_group_no_and_offset(sb, pa->pa_pstart, &group, &bit);
-+ BUG_ON(group != e3b->bd_group && pa->pa_len != 0);
-+ mb_free_blocks(pa->pa_inode, e3b, bit, pa->pa_len);
-+ atomic_add(pa->pa_len, &EXT3_SB(sb)->s_mb_discarded);
-+
-+ ac.ac_sb = sb;
-+ ac.ac_inode = NULL;
-+ ac.ac_b_ex.fe_group = group;
-+ ac.ac_b_ex.fe_start = bit;
-+ ac.ac_b_ex.fe_len = pa->pa_len;
-+ ac.ac_b_ex.fe_logical = 0;
-+ ext3_mb_store_history(&ac);
-+
-+ return 0;
-+}
-+
-+/*
-+ * releases all preallocations in given group
-+ *
-+ * first, we need to decide discard policy:
-+ * - when do we discard
-+ * 1) ENOSPC
-+ * - how many do we discard
-+ * 1) how many requested
-+ */
-+int ext3_mb_discard_group_preallocations(struct super_block *sb,
-+ int group, int needed)
-+{
-+ struct ext3_group_info *grp = EXT3_GROUP_INFO(sb, group);
-+ struct buffer_head *bitmap_bh = NULL;
-+ struct ext3_prealloc_space *pa, *tmp;
-+ struct list_head list;
-+ struct ext3_buddy e3b;
-+ int err, busy, free = 0;
-+
-+ mb_debug("discard preallocation for group %lu\n", group);
-+
-+ if (list_empty(&grp->bb_prealloc_list))
-+ return 0;
-+
-+ bitmap_bh = read_block_bitmap(sb, group);
-+ if (bitmap_bh == NULL) {
-+ /* error handling here */
-+ ext3_mb_release_desc(&e3b);
-+ BUG_ON(bitmap_bh == NULL);
-+ }
-+
-+ err = ext3_mb_load_buddy(sb, group, &e3b);
-+ BUG_ON(err != 0); /* error handling here */
-+
-+ if (needed == 0)
-+ needed = EXT3_BLOCKS_PER_GROUP(sb) + 1;
-+
-+ grp = EXT3_GROUP_INFO(sb, group);
-+ INIT_LIST_HEAD(&list);
-+
-+repeat:
-+ busy = 0;
-+ ext3_lock_group(sb, group);
-+ list_for_each_entry_safe (pa, tmp, &grp->bb_prealloc_list, pa_group_list) {
-+ spin_lock(&pa->pa_lock);
-+ if (atomic_read(&pa->pa_count)) {
-+ spin_unlock(&pa->pa_lock);
-+ printk("uh! busy PA\n");
-+ dump_stack();
-+ busy = 1;
-+ continue;
-+ }
-+ if (pa->pa_deleted) {
-+ spin_unlock(&pa->pa_lock);
-+ continue;
-+ }
-+
-+ /* seems this one can be freed ... */
-+ pa->pa_deleted = 1;
-+
-+ /* we can trust pa_free ... */
-+ free += pa->pa_free;
-+
-+ spin_unlock(&pa->pa_lock);
-+
-+ list_del_rcu(&pa->pa_group_list);
-+ list_add(&pa->u.pa_tmp_list, &list);
-+ }
-+
-+ /* if we still need more blocks and some PAs were used, try again */
-+ if (free < needed && busy) {
-+ ext3_unlock_group(sb, group);
-+ goto repeat;
-+ }
-+
-+ /* found anything to free? */
-+ if (list_empty(&list)) {
-+ BUG_ON(free != 0);
-+ goto out;
-+ }
-+
-+ /* now free all selected PAs */
-+ list_for_each_entry_safe(pa, tmp, &list, u.pa_tmp_list) {
-+
-+ /* remove from object (inode or locality group) */
-+ spin_lock(pa->pa_obj_lock);
-+ list_del_rcu(&pa->pa_inode_list);
-+ spin_unlock(pa->pa_obj_lock);
-+
-+ if (pa->pa_linear)
-+ ext3_mb_release_group_pa(&e3b, pa);
-+ else
-+ ext3_mb_release_inode_pa(&e3b, bitmap_bh, pa);
-+
-+ list_del(&pa->u.pa_tmp_list);
-+ mb_call_rcu(pa);
-+ }
-+
-+out:
-+ ext3_unlock_group(sb, group);
-+ ext3_mb_release_desc(&e3b);
-+ brelse(bitmap_bh);
-+ return free;
-+}
-+
-+/*
-+ * releases all non-used preallocated blocks for given inode
-+ */
-+void ext3_mb_discard_inode_preallocations(struct inode *inode)
-+{
-+ struct ext3_inode_info *ei = EXT3_I(inode);
-+ struct super_block *sb = inode->i_sb;
-+ struct buffer_head *bitmap_bh = NULL;
-+ struct ext3_prealloc_space *pa, *tmp;
-+ unsigned long group = 0;
-+ struct list_head list;
-+ struct ext3_buddy e3b;
-+ int err;
-+
-+ if (!test_opt(sb, MBALLOC) || !S_ISREG(inode->i_mode)) {
-+ /*BUG_ON(!list_empty(&ei->i_prealloc_list));*/
-+ return;
-+ }
-+
-+ mb_debug("discard preallocation for inode %lu\n", inode->i_ino);
-+
-+ INIT_LIST_HEAD(&list);
-+
-+repeat:
-+ /* first, collect all pa's in the inode */
-+ spin_lock(&ei->i_prealloc_lock);
-+ while (!list_empty(&ei->i_prealloc_list)) {
-+ pa = list_entry(ei->i_prealloc_list.next,
-+ struct ext3_prealloc_space, pa_inode_list);
-+ BUG_ON(pa->pa_obj_lock != &ei->i_prealloc_lock);
-+ spin_lock(&pa->pa_lock);
-+ if (atomic_read(&pa->pa_count)) {
-+ /* this shouldn't happen often - nobody should
-+ * use preallocation while we're discarding it */
-+ spin_unlock(&pa->pa_lock);
-+ spin_unlock(&ei->i_prealloc_lock);
-+ printk("uh-oh! used pa while discarding\n");
-+ dump_stack();
-+ current->state = TASK_UNINTERRUPTIBLE;
-+ schedule_timeout(HZ);
-+ goto repeat;
-+
-+ }
-+ if (pa->pa_deleted == 0) {
-+ pa->pa_deleted = 1;
-+ spin_unlock(&pa->pa_lock);
-+ list_del_rcu(&pa->pa_inode_list);
-+ list_add(&pa->u.pa_tmp_list, &list);
-+ continue;
-+ }
-+
-+ /* someone is deleting pa right now */
-+ spin_unlock(&pa->pa_lock);
-+ spin_unlock(&ei->i_prealloc_lock);
-+
-+ /* we have to wait here because pa_deleted
-+ * doesn't mean pa is already unlinked from
-+ * the list. as we might be called from
-+ * ->clear_inode() the inode will get freed
-+ * and concurrent thread which is unlinking
-+ * pa from inode's list may access already
-+ * freed memory, bad-bad-bad */
-+
-+ /* XXX: if this happens too often, we can
-+ * add a flag to force wait only in case
-+ * of ->clear_inode(), but not in case of
-+ * regular truncate */
-+ printk("uh-oh! some one just deleted it\n");
-+ dump_stack();
-+ current->state = TASK_UNINTERRUPTIBLE;
-+ schedule_timeout(HZ);
-+ goto repeat;
-+ }
-+ spin_unlock(&ei->i_prealloc_lock);
-+
-+ list_for_each_entry_safe(pa, tmp, &list, u.pa_tmp_list) {
-+ BUG_ON(pa->pa_linear != 0);
-+ ext3_get_group_no_and_offset(sb, pa->pa_pstart, &group, NULL);
-+
-+ err = ext3_mb_load_buddy(sb, group, &e3b);
-+ BUG_ON(err != 0); /* error handling here */
-+
-+ bitmap_bh = read_block_bitmap(sb, group);
-+ if (bitmap_bh == NULL) {
-+ /* error handling here */
-+ ext3_mb_release_desc(&e3b);
-+ BUG_ON(bitmap_bh == NULL);
-+ }
-+
-+ ext3_lock_group(sb, group);
-+ list_del_rcu(&pa->pa_group_list);
-+ ext3_mb_release_inode_pa(&e3b, bitmap_bh, pa);
-+ ext3_unlock_group(sb, group);
-+
-+ ext3_mb_release_desc(&e3b);
-+ brelse(bitmap_bh);
-+
-+ list_del(&pa->u.pa_tmp_list);
-+ mb_call_rcu(pa);
-+ }
-+}
-+
-+/*
-+ * finds all preallocated spaces and return blocks being freed to them
-+ * if preallocated space becomes full (no block is used from the space)
-+ * then the function frees space in buddy
-+ * XXX: at the moment, truncate (which is the only way to free blocks)
-+ * discards all preallocations
-+ */
-+void ext3_mb_return_to_preallocation(struct inode *inode, struct ext3_buddy *e3b,
-+ sector_t block, int count)
-+{
-+ BUG_ON(!list_empty(&EXT3_I(inode)->i_prealloc_list));
-+}
-+
-+void ext3_mb_show_ac(struct ext3_allocation_context *ac)
-+{
-+#if 0
-+ struct super_block *sb = ac->ac_sb;
-+ int i;
-+
-+ printk(KERN_ERR "EXT3-fs: can't allocate: status %d flags %d\n",
-+ ac->ac_status, ac->ac_flags);
-+ printk(KERN_ERR "EXT3-fs: orig %lu/%lu/%lu@%lu, goal %lu/%lu/%lu@%lu, "
-+ "best %lu/%lu/%lu@%lu cr %d\n",
-+ ac->ac_o_ex.fe_group, ac->ac_o_ex.fe_start,
-+ ac->ac_o_ex.fe_len, ac->ac_o_ex.fe_logical,
-+ ac->ac_g_ex.fe_group, ac->ac_g_ex.fe_start,
-+ ac->ac_g_ex.fe_len, ac->ac_g_ex.fe_logical,
-+ ac->ac_b_ex.fe_group, ac->ac_b_ex.fe_start,
-+ ac->ac_b_ex.fe_len, ac->ac_b_ex.fe_logical,
-+ ac->ac_criteria);
-+ printk(KERN_ERR "EXT3-fs: %lu scanned, %d found\n", ac->ac_ex_scanned,
-+ ac->ac_found);
-+ printk("EXT3-fs: groups: ");
-+ for (i = 0; i < EXT3_SB(sb)->s_groups_count; i++) {
-+ struct ext3_group_info *grp = EXT3_GROUP_INFO(sb, i);
-+ struct ext3_prealloc_space *pa;
-+ unsigned long start;
-+ struct list_head *cur;
-+ list_for_each_rcu(cur, &grp->bb_prealloc_list) {
-+ pa = list_entry(cur, struct ext3_prealloc_space,
-+ pa_group_list);
-+ spin_lock(&pa->pa_lock);
-+ ext3_get_group_no_and_offset(sb, pa->pa_pstart, NULL, &start);
-+ spin_unlock(&pa->pa_lock);
-+ printk("PA:%u:%lu:%u ", i, start, pa->pa_len);
-+ }
-+
-+ if (grp->bb_free == 0)
-+ continue;
-+ printk("%d: %d/%d ", i, grp->bb_free, grp->bb_fragments);
-+ }
-+ printk("\n");
-+ //dump_stack();
-+#endif
-+}
-+
-+void ext3_mb_group_or_file(struct ext3_allocation_context *ac)
-+{
-+ struct ext3_sb_info *sbi = EXT3_SB(ac->ac_sb);
-+ int bsbits = ac->ac_sb->s_blocksize_bits;
-+ loff_t size, isize;
-+
-+ if (!(ac->ac_flags & EXT3_MB_HINT_DATA))
-+ return;
-+
-+ size = ac->ac_o_ex.fe_logical + ac->ac_o_ex.fe_len;
-+ isize = i_size_read(ac->ac_inode) >> bsbits;
-+ if (size < isize)
-+ size = isize;
-+
-+ /* don't use group allocation for large files */
-+ if (size >= sbi->s_mb_stream_request)
-+ return;
-+
-+ if (unlikely(ac->ac_flags & EXT3_MB_HINT_GOAL_ONLY))
-+ return;
-+
-+ BUG_ON(ac->ac_lg != NULL);
-+ ac->ac_lg = &sbi->s_locality_groups[smp_processor_id()];
-+
-+ /* we're going to use group allocation */
-+ ac->ac_flags |= EXT3_MB_HINT_GROUP_ALLOC;
-+
-+ /* serialize all allocations in the group */
-+ down(&ac->ac_lg->lg_sem);
-+}
-+
-+int ext3_mb_initialize_context(struct ext3_allocation_context *ac,
-+ struct ext3_allocation_request *ar)
-+{
-+ struct super_block *sb = ar->inode->i_sb;
-+ struct ext3_sb_info *sbi = EXT3_SB(sb);
-+ struct ext3_super_block *es = sbi->s_es;
-+ unsigned long group, len, goal;
-+ unsigned long block;
-+
-+ /* we can't allocate > group size */
-+ len = ar->len;
-+ if (len >= EXT3_BLOCKS_PER_GROUP(sb) - 10)
-+ len = EXT3_BLOCKS_PER_GROUP(sb) - 10;
-+
-+ /* start searching from the goal */
-+ goal = ar->goal;
-+ if (goal < le32_to_cpu(es->s_first_data_block) ||
-+ goal >= le32_to_cpu(es->s_blocks_count))
-+ goal = le32_to_cpu(es->s_first_data_block);
-+ ext3_get_group_no_and_offset(sb, goal, &group, &block);
-+
-+ /* set up allocation goals */
-+ ac->ac_b_ex.fe_logical = ar->logical;
-+ ac->ac_b_ex.fe_group = 0;
-+ ac->ac_b_ex.fe_start = 0;
-+ ac->ac_b_ex.fe_len = 0;
-+ ac->ac_status = AC_STATUS_CONTINUE;
-+ ac->ac_groups_scanned = 0;
-+ ac->ac_ex_scanned = 0;
-+ ac->ac_found = 0;
-+ ac->ac_sb = sb;
-+ ac->ac_inode = ar->inode;
-+ ac->ac_o_ex.fe_logical = ar->logical;
-+ ac->ac_o_ex.fe_group = group;
-+ ac->ac_o_ex.fe_start = block;
-+ ac->ac_o_ex.fe_len = len;
-+ ac->ac_g_ex.fe_logical = ar->logical;
-+ ac->ac_g_ex.fe_group = group;
-+ ac->ac_g_ex.fe_start = block;
-+ ac->ac_g_ex.fe_len = len;
-+ ac->ac_f_ex.fe_len = 0;
-+ ac->ac_flags = ar->flags;
-+ ac->ac_2order = 0;
-+ ac->ac_criteria = 0;
-+ ac->ac_pa = NULL;
-+ ac->ac_bitmap_page = NULL;
-+ ac->ac_buddy_page = NULL;
-+ ac->ac_lg = NULL;
-+
-+ /* we have to define context: we'll we work with a file or
-+ * locality group. this is a policy, actually */
-+ ext3_mb_group_or_file(ac);
-+
-+ mb_debug("init ac: %u blocks @ %llu, goal %llu, flags %x, 2^%d, "
-+ "left: %llu/%llu, right %llu/%llu to %swritable\n",
-+ (unsigned) ar->len, (unsigned) ar->logical,
-+ (unsigned) ar->goal, ac->ac_flags, ac->ac_2order,
-+ (unsigned) ar->lleft, (unsigned) ar->pleft,
-+ (unsigned) ar->lright, (unsigned) ar->pright,
-+ atomic_read(&ar->inode->i_writecount) ? "" : "non-");
-+ return 0;
-+
-+}
-+
-+/*
-+ * release all resource we used in allocation
-+ */
-+int ext3_mb_release_context(struct ext3_allocation_context *ac)
-+{
-+ if (ac->ac_pa) {
-+ if (ac->ac_pa->pa_linear) {
-+ /* see comment in ext3_mb_use_group_pa() */
-+ spin_lock(&ac->ac_pa->pa_lock);
-+ ac->ac_pa->pa_pstart += ac->ac_b_ex.fe_len;
-+ ac->ac_pa->pa_lstart += ac->ac_b_ex.fe_len;
-+ ac->ac_pa->pa_free -= ac->ac_b_ex.fe_len;
-+ ac->ac_pa->pa_len -= ac->ac_b_ex.fe_len;
-+ spin_unlock(&ac->ac_pa->pa_lock);
-+ }
-+ ext3_mb_put_pa(ac, ac->ac_sb, ac->ac_pa);
-+ }
-+ if (ac->ac_bitmap_page)
-+ page_cache_release(ac->ac_bitmap_page);
-+ if (ac->ac_buddy_page)
-+ page_cache_release(ac->ac_buddy_page);
-+ if (ac->ac_flags & EXT3_MB_HINT_GROUP_ALLOC)
-+ up(&ac->ac_lg->lg_sem);
-+ ext3_mb_collect_stats(ac);
-+ return 0;
-+}
-+
-+int ext3_mb_discard_preallocations(struct super_block *sb, int needed)
-+{
-+ int i, ret, freed = 0;
-+
-+ for (i = 0; i < EXT3_SB(sb)->s_groups_count && needed > 0; i++) {
-+ ret = ext3_mb_discard_group_preallocations(sb, i, needed);
-+ freed += ret;
-+ needed -= ret;
-+ }
-+
-+ return freed;
-+}
-+
-+/*
-+ * Main entry point into mballoc to allocate blocks
-+ * it tries to use preallocation first, then falls back
-+ * to usual allocation
-+ */
-+unsigned long ext3_mb_new_blocks(handle_t *handle,
-+ struct ext3_allocation_request *ar, int *errp)
-+{
-+ struct ext3_allocation_context ac;
-+ struct ext3_sb_info *sbi;
-+ struct super_block *sb;
-+ unsigned long block = 0;
-+ int freed, inquota;
-+
-+ sb = ar->inode->i_sb;
-+ sbi = EXT3_SB(sb);
-+
-+ if (!test_opt(sb, MBALLOC)) {
-+ static int ext3_mballoc_warning = 0;
-+ if (ext3_mballoc_warning++ == 0)
-+ printk(KERN_ERR "EXT3-fs: multiblock request with "
-+ "mballoc disabled!\n");
-+ ar->len = 1;
-+ block = ext3_new_block_old(handle, ar->inode, ar->goal, errp);
-+ return block;
-+ }
-+
-+ while (ar->len && DQUOT_ALLOC_BLOCK(ar->inode, ar->len)) {
-+ ar->flags |= EXT3_MB_HINT_NOPREALLOC;
-+ ar->len--;
-+ }
-+ if (ar->len == 0) {
-+ *errp = -EDQUOT;
-+ return 0;
-+ }
-+ inquota = ar->len;
-+
-+ ext3_mb_poll_new_transaction(sb, handle);
-+
-+ if ((*errp = ext3_mb_initialize_context(&ac, ar))) {
-+ ar->len = 0;
-+ goto out;
-+ }
-+
-+ ac.ac_op = EXT3_MB_HISTORY_PREALLOC;
-+ if (!ext3_mb_use_preallocated(&ac)) {
-+
-+ ac.ac_op = EXT3_MB_HISTORY_ALLOC;
-+ ext3_mb_normalize_request(&ac, ar);
-+
-+repeat:
-+ /* allocate space in core */
-+ ext3_mb_regular_allocator(&ac);
-+
-+ /* as we've just preallocated more space than
-+ * user requested orinally, we store allocated
-+ * space in a special descriptor */
-+ if (ac.ac_status == AC_STATUS_FOUND &&
-+ ac.ac_o_ex.fe_len < ac.ac_b_ex.fe_len)
-+ ext3_mb_new_preallocation(&ac);
-+ }
-+
-+ if (likely(ac.ac_status == AC_STATUS_FOUND)) {
-+ ext3_mb_mark_diskspace_used(&ac, handle);
-+ *errp = 0;
-+ block = ext3_grp_offs_to_block(sb, &ac.ac_b_ex);
-+ ar->len = ac.ac_b_ex.fe_len;
-+ } else {
-+ freed = ext3_mb_discard_preallocations(sb, ac.ac_o_ex.fe_len);
-+ if (freed)
-+ goto repeat;
-+ *errp = -ENOSPC;
-+ ac.ac_b_ex.fe_len = 0;
-+ ar->len = 0;
-+ ext3_mb_show_ac(&ac);
-+ }
-+
-+ ext3_mb_release_context(&ac);
-+
-+out:
-+ if (ar->len < inquota)
-+ DQUOT_FREE_BLOCK(ar->inode, inquota - ar->len);
-+
-+ return block;
-+}
-+EXPORT_SYMBOL(ext3_mb_new_blocks);
-+
-+int ext3_new_block(handle_t *handle, struct inode *inode,
-+ unsigned long goal, int *errp)
-+{
-+ struct ext3_allocation_request ar;
-+ unsigned long ret;
-+
-+ if (!test_opt(inode->i_sb, MBALLOC)) {
-+ ret = ext3_new_block_old(handle, inode, goal, errp);
-+ return ret;
-+ }
-+
-+ ar.inode = inode;
-+ ar.goal = goal;
-+ ar.len = 1;
-+ ar.logical = 0;
-+ ar.lleft = 0;
-+ ar.pleft = 0;
-+ ar.lright = 0;
-+ ar.pright = 0;
-+ ar.flags = 0;
-+ ret = ext3_mb_new_blocks(handle, &ar, errp);
-+ return ret;
-+}
-+
-+void ext3_mb_poll_new_transaction(struct super_block *sb, handle_t *handle)
-+{
-+ struct ext3_sb_info *sbi = EXT3_SB(sb);
-+
-+ if (sbi->s_last_transaction == handle->h_transaction->t_tid)
-+ return;
-+
-+ /* new transaction! time to close last one and free blocks for
-+ * committed transaction. we know that only transaction can be
-+ * active, so previos transaction can be being logged and we
-+ * know that transaction before previous is known to be already
-+ * logged. this means that now we may free blocks freed in all
-+ * transactions before previous one. hope I'm clear enough ... */
-+
-+ spin_lock(&sbi->s_md_lock);
-+ if (sbi->s_last_transaction != handle->h_transaction->t_tid) {
-+ mb_debug("new transaction %lu, old %lu\n",
-+ (unsigned long) handle->h_transaction->t_tid,
-+ (unsigned long) sbi->s_last_transaction);
-+ list_splice_init(&sbi->s_closed_transaction,
-+ &sbi->s_committed_transaction);
-+ list_splice_init(&sbi->s_active_transaction,
-+ &sbi->s_closed_transaction);
-+ sbi->s_last_transaction = handle->h_transaction->t_tid;
-+ }
-+ spin_unlock(&sbi->s_md_lock);
-+
-+ ext3_mb_free_committed_blocks(sb);
-+}
-+
-+int ext3_mb_free_metadata(handle_t *handle, struct ext3_buddy *e3b,
-+ int group, int block, int count)
-+{
-+ struct ext3_group_info *db = e3b->bd_info;
-+ struct super_block *sb = e3b->bd_sb;
-+ struct ext3_sb_info *sbi = EXT3_SB(sb);
-+ struct ext3_free_metadata *md;
-+ int i;
-+
-+ BUG_ON(e3b->bd_bitmap_page == NULL);
-+ BUG_ON(e3b->bd_buddy_page == NULL);
-+
-+ ext3_lock_group(sb, group);
-+ for (i = 0; i < count; i++) {
-+ md = db->bb_md_cur;
-+ if (md && db->bb_tid != handle->h_transaction->t_tid) {
-+ db->bb_md_cur = NULL;
-+ md = NULL;
-+ }
-+
-+ if (md == NULL) {
-+ ext3_unlock_group(sb, group);
-+ md = kmalloc(sizeof(*md), GFP_KERNEL);
-+ if (md == NULL)
-+ return -ENOMEM;
-+ md->num = 0;
-+ md->group = group;
-+
-+ ext3_lock_group(sb, group);
-+ if (db->bb_md_cur == NULL) {
-+ spin_lock(&sbi->s_md_lock);
-+ list_add(&md->list, &sbi->s_active_transaction);
-+ spin_unlock(&sbi->s_md_lock);
-+ /* protect buddy cache from being freed,
-+ * otherwise we'll refresh it from
-+ * on-disk bitmap and lose not-yet-available
-+ * blocks */
-+ page_cache_get(e3b->bd_buddy_page);
-+ page_cache_get(e3b->bd_bitmap_page);
-+ db->bb_md_cur = md;
-+ db->bb_tid = handle->h_transaction->t_tid;
-+ mb_debug("new md 0x%p for group %u\n",
-+ md, md->group);
-+ } else {
-+ kfree(md);
-+ md = db->bb_md_cur;
-+ }
-+ }
-+
-+ BUG_ON(md->num >= EXT3_BB_MAX_BLOCKS);
-+ md->blocks[md->num] = block + i;
-+ md->num++;
-+ if (md->num == EXT3_BB_MAX_BLOCKS) {
-+ /* no more space, put full container on a sb's list */
-+ db->bb_md_cur = NULL;
-+ }
-+ }
-+ ext3_unlock_group(sb, group);
-+ return 0;
-+}
-+
-+/*
-+ * Main entry point into mballoc to free blocks
-+ */
-+void ext3_mb_free_blocks(handle_t *handle, struct inode *inode,
-+ unsigned long block, unsigned long count,
-+ int metadata, int *freed)
-+{
-+ struct buffer_head *bitmap_bh = NULL;
-+ struct super_block *sb = inode->i_sb;
-+ struct ext3_allocation_context ac;
-+ struct ext3_group_desc *gdp;
-+ struct ext3_super_block *es;
-+ unsigned long bit, overflow;
-+ struct buffer_head *gd_bh;
-+ unsigned long block_group;
-+ struct ext3_sb_info *sbi;
-+ struct ext3_buddy e3b;
-+ int err = 0, ret;
-+
-+ *freed = 0;
-+
-+ ext3_mb_poll_new_transaction(sb, handle);
-+
-+ sbi = EXT3_SB(sb);
-+ es = EXT3_SB(sb)->s_es;
-+ if (block < le32_to_cpu(es->s_first_data_block) ||
-+ block + count < block ||
-+ block + count > le32_to_cpu(es->s_blocks_count)) {
-+ ext3_error (sb, __FUNCTION__,
-+ "Freeing blocks not in datazone - "
-+ "block = %lu, count = %lu", block, count);
-+ goto error_return;
-+ }
-+
-+ ext3_debug("freeing block %lu\n", block);
-+
-+ ac.ac_op = EXT3_MB_HISTORY_FREE;
-+ ac.ac_inode = inode;
-+ ac.ac_sb = sb;
-+
-+do_more:
-+ overflow = 0;
-+ ext3_get_group_no_and_offset(sb, block, &block_group, &bit);
-+
-+ /*
-+ * Check to see if we are freeing blocks across a group
-+ * boundary.
-+ */
-+ if (bit + count > EXT3_BLOCKS_PER_GROUP(sb)) {
-+ overflow = bit + count - EXT3_BLOCKS_PER_GROUP(sb);
-+ count -= overflow;
-+ }
-+ brelse(bitmap_bh);
-+ bitmap_bh = read_block_bitmap(sb, block_group);
-+ if (!bitmap_bh)
-+ goto error_return;
-+ gdp = ext3_get_group_desc (sb, block_group, &gd_bh);
-+ if (!gdp)
-+ goto error_return;
-+
-+ if (in_range (le32_to_cpu(gdp->bg_block_bitmap), block, count) ||
-+ in_range (le32_to_cpu(gdp->bg_inode_bitmap), block, count) ||
-+ in_range (block, le32_to_cpu(gdp->bg_inode_table),
-+ EXT3_SB(sb)->s_itb_per_group) ||
-+ in_range (block + count - 1, le32_to_cpu(gdp->bg_inode_table),
-+ EXT3_SB(sb)->s_itb_per_group))
-+ ext3_error(sb, __FUNCTION__,
-+ "Freeing blocks in system zone - "
-+ "Block = %lu, count = %lu", block, count);
-+
-+ BUFFER_TRACE(bitmap_bh, "getting write access");
-+ err = ext3_journal_get_write_access(handle, bitmap_bh);
-+ if (err)
-+ goto error_return;
-+
-+ /*
-+ * We are about to modify some metadata. Call the journal APIs
-+ * to unshare ->b_data if a currently-committing transaction is
-+ * using it
-+ */
-+ BUFFER_TRACE(gd_bh, "get_write_access");
-+ err = ext3_journal_get_write_access(handle, gd_bh);
-+ if (err)
-+ goto error_return;
-+
-+ err = ext3_mb_load_buddy(sb, block_group, &e3b);
-+ if (err)
-+ goto error_return;
-+
-+#ifdef AGGRESSIVE_CHECK
-+ {
-+ int i;
-+ for (i = 0; i < count; i++)
-+ 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 = ext3_journal_dirty_metadata(handle, bitmap_bh);
-+
-+ ac.ac_b_ex.fe_group = block_group;
-+ ac.ac_b_ex.fe_start = bit;
-+ ac.ac_b_ex.fe_len = count;
-+ ext3_mb_store_history(&ac);
-+
-+ if (metadata) {
-+ /* blocks being freed are metadata. these blocks shouldn't
-+ * be used until this transaction is committed */
-+ ext3_mb_free_metadata(handle, &e3b, block_group, bit, count);
-+ } else {
-+ ext3_lock_group(sb, block_group);
-+ err = mb_free_blocks(inode, &e3b, bit, count);
-+ ext3_mb_return_to_preallocation(inode, &e3b, block, count);
-+ ext3_unlock_group(sb, block_group);
-+ BUG_ON(err != 0);
-+ }
-+
-+ spin_lock(sb_bgl_lock(sbi, block_group));
-+ gdp->bg_free_blocks_count =
-+ cpu_to_le16(le16_to_cpu(gdp->bg_free_blocks_count) + count);
-+ spin_unlock(sb_bgl_lock(sbi, block_group));
-+ percpu_counter_mod(&sbi->s_freeblocks_counter, count);
-+
-+ ext3_mb_release_desc(&e3b);
-+
-+ *freed += count;
-+
-+ /* And the group descriptor block */
-+ BUFFER_TRACE(gd_bh, "dirtied group descriptor block");
-+ ret = ext3_journal_dirty_metadata(handle, gd_bh);
-+ if (!err) err = ret;
-+
-+ if (overflow && !err) {
-+ block += count;
-+ count = overflow;
-+ goto do_more;
-+ }
-+ sb->s_dirt = 1;
-+error_return:
-+ brelse(bitmap_bh);
-+ ext3_std_error(sb, err);
-+ return;
-+}
--
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