mirror of
https://github.com/versity/scoutfs.git
synced 2026-09-01 05:37:33 +00:00
Zach Brown
5f11cdbfe5
For each transaction we send a message to to the server asking for a unique sequence number to associate with the transaction. When we change metadata or data of an inode we store the current transaction seq in the inode and we index it with index items like the other inode fields. The server remembers the sequences it gives out. When we go to walk the inode sequence indexes we ask the server for the largest stable seq and limit results to that seq. This ensures that we never return seqs that are past dirty items so never have inodes and seqs appear in the past. Nodes use the sync timer to regularly cycle through seqs and ensure that inode seq index walks don't get stuck on their otherwise idle seq. Signed-off-by: Zach Brown <zab@versity.com>
76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
#ifndef _SCOUTFS_INODE_H_
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#define _SCOUTFS_INODE_H_
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#include "key.h"
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struct scoutfs_inode_info {
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/* read or initialized for each inode instance */
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u64 ino;
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u64 next_readdir_pos;
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u64 meta_seq;
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u64 data_seq;
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u64 data_version;
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bool have_item;
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u64 item_size;
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struct timespec item_ctime;
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struct timespec item_mtime;
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u64 item_meta_seq;
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u64 item_data_seq;
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/* initialized once for slab object */
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seqcount_t seqcount;
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bool staging; /* holder of i_mutex is staging */
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struct rw_semaphore xattr_rwsem;
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struct rb_node writeback_node;
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struct inode inode;
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};
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static inline struct scoutfs_inode_info *SCOUTFS_I(struct inode *inode)
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{
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return container_of(inode, struct scoutfs_inode_info, inode);
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}
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static inline u64 scoutfs_ino(struct inode *inode)
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{
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return SCOUTFS_I(inode)->ino;
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}
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void scoutfs_inode_init_key(struct scoutfs_key_buf *key,
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struct scoutfs_inode_key *ikey, u64 ino);
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struct inode *scoutfs_alloc_inode(struct super_block *sb);
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void scoutfs_destroy_inode(struct inode *inode);
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int scoutfs_drop_inode(struct inode *inode);
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void scoutfs_evict_inode(struct inode *inode);
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int scoutfs_orphan_inode(struct inode *inode);
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struct inode *scoutfs_iget(struct super_block *sb, u64 ino);
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int scoutfs_dirty_inode_item(struct inode *inode);
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void scoutfs_dirty_inode(struct inode *inode, int flags);
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void scoutfs_update_inode_item(struct inode *inode);
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void scoutfs_inode_fill_pool(struct super_block *sb, u64 ino, u64 nr);
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struct inode *scoutfs_new_inode(struct super_block *sb, struct inode *dir,
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umode_t mode, dev_t rdev);
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void scoutfs_inode_set_meta_seq(struct inode *inode);
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void scoutfs_inode_set_data_seq(struct inode *inode);
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void scoutfs_inode_inc_data_version(struct inode *inode);
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u64 scoutfs_inode_meta_seq(struct inode *inode);
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u64 scoutfs_inode_data_seq(struct inode *inode);
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u64 scoutfs_inode_data_version(struct inode *inode);
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int scoutfs_scan_orphans(struct super_block *sb);
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void scoutfs_inode_queue_writeback(struct inode *inode);
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int scoutfs_inode_walk_writeback(struct super_block *sb, bool write);
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u64 scoutfs_last_ino(struct super_block *sb);
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void scoutfs_inode_exit(void);
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int scoutfs_inode_init(void);
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int scoutfs_inode_setup(struct super_block *sb);
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void scoutfs_inode_destroy(struct super_block *sb);
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#endif
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