Submit #2767 ยป 0001-sys-vfs-hammer-make-description-on-low-level-storage.patch
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* 64K X-bufs are used for blocks >= a file's 1MB mark.
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*
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* Per-volume storage limit: 52 bits 4096 TB
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* Per-Zone storage limit: 59 bits 512 KTB (due to blockmap)
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* Per-Zone storage limit: 60 bits 1 MTB
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* Per-filesystem storage limit: 60 bits 1 MTB
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*/
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#define HAMMER_BUFSIZE 16384
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*
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* Hammer offsets are used for FIFO indexing and embed a cycle counter
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* and volume number in addition to the offset. Most offsets are required
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* to be 64-byte aligned.
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* to be 16 KB aligned.
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*/
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typedef u_int64_t hammer_tid_t;
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typedef u_int64_t hammer_off_t;
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* zone 8 (z,v,o): B-Tree - actually zone-2 address
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* zone 9 (z,v,o): Record - actually zone-2 address
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* zone 10 (z,v,o): Large-data - actually zone-2 address
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* zone 11 (z,v,o): Small-data - actually zone-2 address
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* zone 15: reserved for sanity
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*
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* layer1/layer2 direct map:
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* Large-Block backing store
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*
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* A blockmap is a two-level map which translates a blockmap-backed zone
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* offset into a raw zone 2 offset. Each layer handles 18 bits. The 8M
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* large-block size is 23 bits so two layers gives us 23+18+18 = 59 bits
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* of address space.
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* offset into a raw zone 2 offset. The layer 1 handles 18 bits and the
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* layer 2 handles 19 bits. The 8M large-block size is 23 bits so two
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* layers gives us 18+19+23 = 60 bits of address space.
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*
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* When using hinting for a blockmap lookup, the hint is lost when the
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* scan leaves the HINTBLOCK, which is typically several LARGEBLOCK's.
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* thus any space allocated via the freemap can be directly translated
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* to a zone:2 (or zone:8-15) address.
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*
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* zone-X blockmap offset: [z:4][layer1:18][layer2:19][bigblock:23]
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* zone-X blockmap offset: [zone:4][layer1:18][layer2:19][bigblock:23]
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*/
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struct hammer_blockmap_layer1 {
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hammer_off_t blocks_free; /* big-blocks free */
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#define HAMMER_BLOCKMAP_RADIX2_PERBUFFER \
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(HAMMER_BLOCKMAP_RADIX2 / (HAMMER_LARGEBLOCK_SIZE / HAMMER_BUFSIZE))
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#define HAMMER_BLOCKMAP_LAYER1 /* 18+19+23 */ \
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#define HAMMER_BLOCKMAP_LAYER1 /* 18+19+23 - 1EB */ \
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(HAMMER_BLOCKMAP_RADIX1 * HAMMER_BLOCKMAP_LAYER2)
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#define HAMMER_BLOCKMAP_LAYER2 /* 19+23 - 4TB */ \
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(HAMMER_BLOCKMAP_RADIX2 * HAMMER_LARGEBLOCK_SIZE64)
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