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https://github.com/versity/scoutfs.git
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Zach Brown
16abddb46a
Add the most basic ability to read items from log segment blocks. If an item isn't in the cache then we walk segments in the manifest and check for the item in each one. This is just the core fundamental code. There's still a lot to do: basic corruption validation, multi-block segments, bloom filters and arrays to optimize segment misses, and some day the ability to read file data items directly into page cache pages. The manifest locking is also super broken. But this is enough to let us mount and stat the root inode! Signed-off-by: Zach Brown <zab@versity.com>
41 lines
1.4 KiB
C
41 lines
1.4 KiB
C
#ifndef _SCOUTFS_ITEM_H_
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#define _SCOUTFS_ITEM_H_
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#include "format.h"
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struct scoutfs_item {
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struct rb_node node;
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struct rb_node dirty_node;
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atomic_t refcount;
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/* the key is constant for the life of the item */
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struct scoutfs_key key;
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/* the value can be changed by expansion or shrinking */
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unsigned int val_len;
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void *val;
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};
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struct scoutfs_item *scoutfs_item_create(struct super_block *sb,
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struct scoutfs_key *key,
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unsigned int val_len);
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struct scoutfs_item *scoutfs_clean_item(struct super_block *sb,
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struct scoutfs_key *key,
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unsigned int val_len);
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struct scoutfs_item *scoutfs_item_lookup(struct super_block *sb,
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struct scoutfs_key *key);
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struct scoutfs_item *scoutfs_item_next(struct super_block *sb,
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struct scoutfs_key *key);
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struct scoutfs_item *scoutfs_item_prev(struct super_block *sb,
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struct scoutfs_key *key);
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int scoutfs_item_expand(struct scoutfs_item *item, int off, int bytes);
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int scoutfs_item_shrink(struct scoutfs_item *item, int off, int bytes);
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void scoutfs_item_delete(struct super_block *sb, struct scoutfs_item *item);
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void scoutfs_item_mark_dirty(struct super_block *sb, struct scoutfs_item *item);
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struct scoutfs_item *scoutfs_item_next_dirty(struct super_block *sb,
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struct scoutfs_item *item);
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void scoutfs_item_all_clean(struct super_block *sb);
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void scoutfs_item_put(struct scoutfs_item *item);
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#endif
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