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b605407c29
Add infrastructure for working with extents. Callers provide callbacks which operate on their extent storage while this code performs the fiddly splitting and merging of extents. This layer doesn't have any persitent structures itself, it only operates on native structs in memory. Signed-off-by: Zach Brown <zab@versity.com>
36 lines
1.2 KiB
C
36 lines
1.2 KiB
C
#ifndef _SCOUTFS_EXT_H_
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#define _SCOUTFS_EXT_H_
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struct scoutfs_extent {
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u64 start;
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u64 len;
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u64 map;
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u8 flags;
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};
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struct scoutfs_ext_ops {
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int (*next)(struct super_block *sb, void *arg,
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u64 start, u64 len, struct scoutfs_extent *ext);
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int (*insert)(struct super_block *sb, void *arg,
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u64 start, u64 len, u64 map, u8 flags);
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int (*remove)(struct super_block *sb, void *arg, u64 start, u64 len,
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u64 map, u8 flags);
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};
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bool scoutfs_ext_can_merge(struct scoutfs_extent *left,
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struct scoutfs_extent *right);
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int scoutfs_ext_next(struct super_block *sb, struct scoutfs_ext_ops *ops,
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void *arg, u64 start, u64 len, struct scoutfs_extent *ext);
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int scoutfs_ext_insert(struct super_block *sb, struct scoutfs_ext_ops *ops,
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void *arg, u64 start, u64 len, u64 map, u8 flags);
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int scoutfs_ext_remove(struct super_block *sb, struct scoutfs_ext_ops *ops,
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void *arg, u64 start, u64 len);
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int scoutfs_ext_alloc(struct super_block *sb, struct scoutfs_ext_ops *ops,
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void *arg, u64 start, u64 len, u64 limit,
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struct scoutfs_extent *ext);
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int scoutfs_ext_set(struct super_block *sb, struct scoutfs_ext_ops *ops,
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void *arg, u64 start, u64 len, u64 map, u8 flags);
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#endif
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