772cb7c83b
This patch mostly controls the way inode are allocated in order to make ialloc aware of flex_bg block group grouping. It achieves this by bypassing the Orlov allocator when block group meta-data are packed toghether through mke2fs. Since the impact on the block allocator is minimal, this patch should have little or no effect on other block allocation algorithms. By controlling the inode allocation, it can basically control where the initial search for new block begins and thus indirectly manipulate the block allocator. This allocator favors data and meta-data locality so the disk will gradually be filled from block group zero upward. This helps improve performance by reducing seek time. Since the group of inode tables within one flex_bg are treated as one giant inode table, uninitialized block groups would not need to partially initialize as many inode table as with Orlov which would help fsck time as the filesystem usage goes up. Signed-off-by: Jose R. Santos <jrs@us.ibm.com> Signed-off-by: Valerie Clement <valerie.clement@bull.net> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
152 lines
4.6 KiB
C
152 lines
4.6 KiB
C
/*
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* ext4_sb.h
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/include/linux/minix_fs_sb.h
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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#ifndef _EXT4_SB
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#define _EXT4_SB
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#ifdef __KERNEL__
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#include <linux/timer.h>
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#include <linux/wait.h>
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#include <linux/blockgroup_lock.h>
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#include <linux/percpu_counter.h>
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#endif
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#include <linux/rbtree.h>
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/*
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* fourth extended-fs super-block data in memory
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*/
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struct ext4_sb_info {
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unsigned long s_desc_size; /* Size of a group descriptor in bytes */
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unsigned long s_inodes_per_block;/* Number of inodes per block */
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unsigned long s_blocks_per_group;/* Number of blocks in a group */
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unsigned long s_inodes_per_group;/* Number of inodes in a group */
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unsigned long s_itb_per_group; /* Number of inode table blocks per group */
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unsigned long s_gdb_count; /* Number of group descriptor blocks */
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unsigned long s_desc_per_block; /* Number of group descriptors per block */
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ext4_group_t s_groups_count; /* Number of groups in the fs */
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unsigned long s_overhead_last; /* Last calculated overhead */
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unsigned long s_blocks_last; /* Last seen block count */
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loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
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struct buffer_head * s_sbh; /* Buffer containing the super block */
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struct ext4_super_block * s_es; /* Pointer to the super block in the buffer */
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struct buffer_head ** s_group_desc;
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unsigned long s_mount_opt;
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ext4_fsblk_t s_sb_block;
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uid_t s_resuid;
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gid_t s_resgid;
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unsigned short s_mount_state;
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unsigned short s_pad;
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int s_addr_per_block_bits;
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int s_desc_per_block_bits;
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int s_inode_size;
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int s_first_ino;
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spinlock_t s_next_gen_lock;
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u32 s_next_generation;
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u32 s_hash_seed[4];
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int s_def_hash_version;
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struct percpu_counter s_freeblocks_counter;
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struct percpu_counter s_freeinodes_counter;
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struct percpu_counter s_dirs_counter;
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struct blockgroup_lock s_blockgroup_lock;
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/* root of the per fs reservation window tree */
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spinlock_t s_rsv_window_lock;
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struct rb_root s_rsv_window_root;
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struct ext4_reserve_window_node s_rsv_window_head;
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/* Journaling */
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struct inode * s_journal_inode;
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struct journal_s * s_journal;
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struct list_head s_orphan;
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unsigned long s_commit_interval;
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struct block_device *journal_bdev;
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#ifdef CONFIG_JBD2_DEBUG
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struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
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wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
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#endif
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#ifdef CONFIG_QUOTA
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char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
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int s_jquota_fmt; /* Format of quota to use */
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#endif
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unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
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#ifdef EXTENTS_STATS
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/* ext4 extents stats */
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unsigned long s_ext_min;
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unsigned long s_ext_max;
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unsigned long s_depth_max;
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spinlock_t s_ext_stats_lock;
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unsigned long s_ext_blocks;
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unsigned long s_ext_extents;
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#endif
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/* for buddy allocator */
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struct ext4_group_info ***s_group_info;
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struct inode *s_buddy_cache;
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long s_blocks_reserved;
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spinlock_t s_reserve_lock;
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struct list_head s_active_transaction;
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struct list_head s_closed_transaction;
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struct list_head s_committed_transaction;
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spinlock_t s_md_lock;
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tid_t s_last_transaction;
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unsigned short *s_mb_offsets, *s_mb_maxs;
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/* tunables */
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unsigned long s_stripe;
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unsigned long s_mb_stream_request;
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unsigned long s_mb_max_to_scan;
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unsigned long s_mb_min_to_scan;
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unsigned long s_mb_stats;
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unsigned long s_mb_order2_reqs;
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unsigned long s_mb_group_prealloc;
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/* where last allocation was done - for stream allocation */
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unsigned long s_mb_last_group;
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unsigned long s_mb_last_start;
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/* history to debug policy */
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struct ext4_mb_history *s_mb_history;
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int s_mb_history_cur;
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int s_mb_history_max;
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int s_mb_history_num;
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struct proc_dir_entry *s_mb_proc;
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spinlock_t s_mb_history_lock;
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int s_mb_history_filter;
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/* stats for buddy allocator */
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spinlock_t s_mb_pa_lock;
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atomic_t s_bal_reqs; /* number of reqs with len > 1 */
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atomic_t s_bal_success; /* we found long enough chunks */
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atomic_t s_bal_allocated; /* in blocks */
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atomic_t s_bal_ex_scanned; /* total extents scanned */
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atomic_t s_bal_goals; /* goal hits */
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atomic_t s_bal_breaks; /* too long searches */
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atomic_t s_bal_2orders; /* 2^order hits */
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spinlock_t s_bal_lock;
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unsigned long s_mb_buddies_generated;
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unsigned long long s_mb_generation_time;
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atomic_t s_mb_lost_chunks;
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atomic_t s_mb_preallocated;
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atomic_t s_mb_discarded;
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/* locality groups */
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struct ext4_locality_group *s_locality_groups;
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unsigned int s_log_groups_per_flex;
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struct flex_groups *s_flex_groups;
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};
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#endif /* _EXT4_SB */
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