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-rw-r--r--fs/ext4/mballoc.h304
1 files changed, 304 insertions, 0 deletions
diff --git a/fs/ext4/mballoc.h b/fs/ext4/mballoc.h
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--- /dev/null
+++ b/fs/ext4/mballoc.h
@@ -0,0 +1,304 @@
+/*
+ * fs/ext4/mballoc.h
+ *
+ * Written by: Alex Tomas <alex@clusterfs.com>
+ *
+ */
+#ifndef _EXT4_MBALLOC_H
+#define _EXT4_MBALLOC_H
+
+#include <linux/time.h>
+#include <linux/fs.h>
+#include <linux/namei.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>
+#include "ext4_jbd2.h"
+#include "ext4.h"
+#include "group.h"
+
+/*
+ * 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 EXT4_MB_HISTORY mballoc stores last N allocations in memory
+ * and you can monitor it in /proc/fs/ext4/<dev>/mb_history
+ */
+#define EXT4_MB_HISTORY
+#define EXT4_MB_HISTORY_ALLOC 1 /* allocation */
+#define EXT4_MB_HISTORY_PREALLOC 2 /* preallocated blocks used */
+#define EXT4_MB_HISTORY_DISCARD 4 /* preallocation discarded */
+#define EXT4_MB_HISTORY_FREE 8 /* free */
+
+#define EXT4_MB_HISTORY_DEFAULT (EXT4_MB_HISTORY_ALLOC | \
+ EXT4_MB_HISTORY_PREALLOC)
+
+/*
+ * 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 'ext4_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
+ * We use locality group prealloc space for stream request.
+ * We can tune the same via /proc/fs/ext4/<parition>/stream_req
+ */
+#define MB_DEFAULT_STREAM_THRESHOLD 16 /* 64K */
+
+/*
+ * for which requests use 2^N search using buddies
+ */
+#define MB_DEFAULT_ORDER2_REQS 2
+
+/*
+ * default group prealloc size 512 blocks
+ */
+#define MB_DEFAULT_GROUP_PREALLOC 512
+
+static struct kmem_cache *ext4_pspace_cachep;
+static struct kmem_cache *ext4_ac_cachep;
+
+#ifdef EXT4_BB_MAX_BLOCKS
+#undef EXT4_BB_MAX_BLOCKS
+#endif
+#define EXT4_BB_MAX_BLOCKS 30
+
+struct ext4_free_metadata {
+ ext4_group_t group;
+ unsigned short num;
+ ext4_grpblk_t blocks[EXT4_BB_MAX_BLOCKS];
+ struct list_head list;
+};
+
+struct ext4_group_info {
+ unsigned long bb_state;
+ unsigned long bb_tid;
+ struct ext4_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 EXT4_GROUP_INFO_NEED_INIT_BIT 0
+#define EXT4_GROUP_INFO_LOCKED_BIT 1
+
+#define EXT4_MB_GRP_NEED_INIT(grp) \
+ (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
+
+
+struct ext4_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;
+ ext4_fsblk_t pa_pstart; /* phys. block */
+ ext4_lblk_t 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 grp prealloc */
+ spinlock_t *pa_obj_lock;
+ struct inode *pa_inode; /* hack, for history only */
+};
+
+
+struct ext4_free_extent {
+ ext4_lblk_t fe_logical;
+ ext4_grpblk_t fe_start;
+ ext4_group_t fe_group;
+ int fe_len;
+};
+
+/*
+ * Locality group:
+ * we try to group all related changes together
+ * so that writeback can flush/allocate them together as well
+ */
+struct ext4_locality_group {
+ /* for allocator */
+ struct mutex lg_mutex; /* to serialize allocates */
+ struct list_head lg_prealloc_list;/* list of preallocations */
+ spinlock_t lg_prealloc_lock;
+};
+
+struct ext4_allocation_context {
+ struct inode *ac_inode;
+ struct super_block *ac_sb;
+
+ /* original request */
+ struct ext4_free_extent ac_o_ex;
+
+ /* goal request (after normalization) */
+ struct ext4_free_extent ac_g_ex;
+
+ /* the best found extent */
+ struct ext4_free_extent ac_b_ex;
+
+ /* copy of the bext found extent taken before preallocation efforts */
+ struct ext4_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 ext4_prealloc_space *ac_pa;
+ struct ext4_locality_group *ac_lg;
+};
+
+#define AC_STATUS_CONTINUE 1
+#define AC_STATUS_FOUND 2
+#define AC_STATUS_BREAK 3
+
+struct ext4_mb_history {
+ struct ext4_free_extent orig; /* orig allocation */
+ struct ext4_free_extent goal; /* goal allocation */
+ struct ext4_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 ext4_buddy {
+ struct page *bd_buddy_page;
+ void *bd_buddy;
+ struct page *bd_bitmap_page;
+ void *bd_bitmap;
+ struct ext4_group_info *bd_info;
+ struct super_block *bd_sb;
+ __u16 bd_blkbits;
+ ext4_group_t bd_group;
+};
+#define EXT4_MB_BITMAP(e4b) ((e4b)->bd_bitmap)
+#define EXT4_MB_BUDDY(e4b) ((e4b)->bd_buddy)
+
+#ifndef EXT4_MB_HISTORY
+static inline void ext4_mb_store_history(struct ext4_allocation_context *ac)
+{
+ return;
+}
+#else
+static void ext4_mb_store_history(struct ext4_allocation_context *ac);
+#endif
+
+#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
+
+static struct proc_dir_entry *proc_root_ext4;
+struct buffer_head *read_block_bitmap(struct super_block *, ext4_group_t);
+
+static void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap,
+ ext4_group_t group);
+static void ext4_mb_poll_new_transaction(struct super_block *, handle_t *);
+static void ext4_mb_free_committed_blocks(struct super_block *);
+static void ext4_mb_return_to_preallocation(struct inode *inode,
+ struct ext4_buddy *e4b, sector_t block,
+ int count);
+static void ext4_mb_put_pa(struct ext4_allocation_context *,
+ struct super_block *, struct ext4_prealloc_space *pa);
+static int ext4_mb_init_per_dev_proc(struct super_block *sb);
+static int ext4_mb_destroy_per_dev_proc(struct super_block *sb);
+
+
+static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
+{
+ struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
+
+ bit_spin_lock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state));
+}
+
+static inline void ext4_unlock_group(struct super_block *sb,
+ ext4_group_t group)
+{
+ struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
+
+ bit_spin_unlock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state));
+}
+
+static inline int ext4_is_group_locked(struct super_block *sb,
+ ext4_group_t group)
+{
+ struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
+
+ return bit_spin_is_locked(EXT4_GROUP_INFO_LOCKED_BIT,
+ &(grinfo->bb_state));
+}
+
+static ext4_fsblk_t ext4_grp_offs_to_block(struct super_block *sb,
+ struct ext4_free_extent *fex)
+{
+ ext4_fsblk_t block;
+
+ block = (ext4_fsblk_t) fex->fe_group * EXT4_BLOCKS_PER_GROUP(sb)
+ + fex->fe_start
+ + le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
+ return block;
+}
+#endif
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