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Add basic sysfs support so that information about the mounted filesystem and various tuning parameters can be accessed via /sys/fs/ext4/<dev>/*. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
162 lines
4.8 KiB
C
162 lines
4.8 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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unsigned int s_inode_readahead_blks;
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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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int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
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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 percpu_counter s_dirtyblocks_counter;
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struct blockgroup_lock *s_blockgroup_lock;
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struct proc_dir_entry *s_proc;
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struct kobject s_kobj;
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struct completion s_kobj_unregister;
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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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u32 s_max_batch_time;
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u32 s_min_batch_time;
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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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spinlock_t s_md_lock;
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tid_t s_last_transaction;
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unsigned short *s_mb_offsets;
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unsigned int *s_mb_maxs;
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/* tunables */
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unsigned long s_stripe;
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unsigned int s_mb_stream_request;
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unsigned int s_mb_max_to_scan;
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unsigned int s_mb_min_to_scan;
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unsigned int s_mb_stats;
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unsigned int s_mb_order2_reqs;
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unsigned int 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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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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/* for write statistics */
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unsigned long s_sectors_written_start;
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u64 s_kbytes_written;
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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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static inline spinlock_t *
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sb_bgl_lock(struct ext4_sb_info *sbi, unsigned int block_group)
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{
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return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
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}
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#endif /* _EXT4_SB */
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