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https://github.com/versity/scoutfs.git
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12067e99ab
Now that the item cache is bearing the load of high frequency item calls, we can remove all the item granular work that the forest was trying to do. The item cache amortizes the cost of the forest so its remaining methods can go straight to the btrees and don't need complicated state to reduce the overhead of item calls. Signed-off-by: Zach Brown <zab@versity.com>
106 lines
3.5 KiB
C
106 lines
3.5 KiB
C
#ifndef _SCOUTFS_LOCK_H_
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#define _SCOUTFS_LOCK_H_
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#include "key.h"
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#include "tseq.h"
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#define SCOUTFS_LKF_REFRESH_INODE 0x01 /* update stale inode from item */
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#define SCOUTFS_LKF_NONBLOCK 0x02 /* only use already held locks */
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#define SCOUTFS_LKF_INVALID (~((SCOUTFS_LKF_NONBLOCK << 1) - 1))
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#define SCOUTFS_LOCK_NR_MODES SCOUTFS_LOCK_INVALID
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/*
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* A few fields (start, end, refresh_gen, write_version, granted_mode)
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* are referenced by code outside lock.c.
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*/
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struct scoutfs_lock {
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struct super_block *sb;
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struct scoutfs_key start;
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struct scoutfs_key end;
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struct rb_node node;
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struct rb_node range_node;
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u64 refresh_gen;
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u64 write_version;
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u64 dirty_trans_seq;
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struct scoutfs_net_roots roots;
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struct list_head lru_head;
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wait_queue_head_t waitq;
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ktime_t grace_deadline;
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unsigned long request_pending:1,
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invalidate_pending:1;
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struct list_head grant_head;
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struct scoutfs_net_lock_grant_response grant_resp;
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struct list_head inv_head;
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struct scoutfs_net_lock inv_nl;
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u64 inv_net_id;
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struct list_head shrink_head;
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spinlock_t cov_list_lock;
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struct list_head cov_list;
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int mode;
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unsigned int waiters[SCOUTFS_LOCK_NR_MODES];
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unsigned int users[SCOUTFS_LOCK_NR_MODES];
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struct scoutfs_tseq_entry tseq_entry;
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/* the forest tracks which log tree last saw bloom bit updates */
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atomic64_t forest_bloom_nr;
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};
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struct scoutfs_lock_coverage {
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spinlock_t cov_lock;
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struct scoutfs_lock *lock;
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struct list_head head;
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};
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int scoutfs_lock_grant_response(struct super_block *sb,
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struct scoutfs_net_lock_grant_response *gr);
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int scoutfs_lock_invalidate_request(struct super_block *sb, u64 net_id,
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struct scoutfs_net_lock *nl);
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int scoutfs_lock_recover_request(struct super_block *sb, u64 net_id,
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struct scoutfs_key *key);
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int scoutfs_lock_inode(struct super_block *sb, int mode, int flags,
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struct inode *inode, struct scoutfs_lock **ret_lock);
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int scoutfs_lock_ino(struct super_block *sb, int mode, int flags, u64 ino,
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struct scoutfs_lock **ret_lock);
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void scoutfs_lock_get_index_item_range(u8 type, u64 major, u64 ino,
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struct scoutfs_key *start,
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struct scoutfs_key *end);
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int scoutfs_lock_inode_index(struct super_block *sb, int mode,
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u8 type, u64 major, u64 ino,
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struct scoutfs_lock **ret_lock);
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int scoutfs_lock_inodes(struct super_block *sb, int mode, int flags,
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struct inode *a, struct scoutfs_lock **a_lock,
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struct inode *b, struct scoutfs_lock **b_lock,
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struct inode *c, struct scoutfs_lock **c_lock,
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struct inode *d, struct scoutfs_lock **D_lock);
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int scoutfs_lock_rename(struct super_block *sb, int mode, int flags,
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struct scoutfs_lock **lock);
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int scoutfs_lock_rid(struct super_block *sb, int mode, int flags,
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u64 rid, struct scoutfs_lock **lock);
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void scoutfs_unlock(struct super_block *sb, struct scoutfs_lock *lock,
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int level);
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void scoutfs_lock_init_coverage(struct scoutfs_lock_coverage *cov);
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void scoutfs_lock_add_coverage(struct super_block *sb,
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struct scoutfs_lock *lock,
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struct scoutfs_lock_coverage *cov);
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bool scoutfs_lock_is_covered(struct super_block *sb,
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struct scoutfs_lock_coverage *cov);
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void scoutfs_lock_del_coverage(struct super_block *sb,
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struct scoutfs_lock_coverage *cov);
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bool scoutfs_lock_protected(struct scoutfs_lock *lock, struct scoutfs_key *key,
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int mode);
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void scoutfs_free_unused_locks(struct super_block *sb, unsigned long nr);
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int scoutfs_lock_setup(struct super_block *sb);
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void scoutfs_lock_shutdown(struct super_block *sb);
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void scoutfs_lock_destroy(struct super_block *sb);
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#endif
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