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https://github.com/XTXMarkets/ternfs.git
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6addbdee6a
Initial version really by Pawel, but many changes in between. Big outstanding issues: * span cache reclamation (unbounded memory otherwise...) * bad block service detection and workarounds * corrupted blocks detection and workaround Co-authored-by: Paweł Dziepak <pawel.dziepak@xtxmarkets.com>
70 lines
2.1 KiB
C
70 lines
2.1 KiB
C
#ifndef _EGGSFS_SPANSIMPLE_H
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#define _EGGSFS_SPANSIMPLE_H
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#include <linux/kernel.h>
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#include "inode.h"
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struct eggsfs_span {
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struct rb_node node; // to look them up
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struct list_head lru; // to decide what to evict
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u64 start;
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u64 end;
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u8 storage_class; // used to determine which type of span this is enclosed in
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};
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struct eggsfs_inline_span {
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struct eggsfs_span span;
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u8 len;
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u8 body[255];
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};
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#define EGGSFS_INLINE_SPAN(_span) ({ \
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BUG_ON(_span->storage_class != EGGSFS_INLINE_STORAGE); \
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container_of(_span, struct eggsfs_inline_span, span); \
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})
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struct eggsfs_block {
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u64 id;
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struct eggsfs_block_service bs;
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u32 crc;
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};
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struct eggsfs_block_span {
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struct eggsfs_span span;
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struct xarray pages; // indexed by page number
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struct eggsfs_block blocks[EGGSFS_MAX_BLOCKS];
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struct eggsfs_latch stripe_latches[15];
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u32 cell_size;
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u32 stripes_crc[15];
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u8 stripes;
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u8 parity;
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};
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#define EGGSFS_BLOCK_SPAN(_span) ({ \
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BUG_ON(_span->storage_class == EGGSFS_EMPTY_STORAGE || _span->storage_class == EGGSFS_INLINE_STORAGE); \
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container_of(_span, struct eggsfs_block_span, span); \
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})
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// Fetches and caches the span if necessary. `offset` need not be the actual
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// span offset, the span containing the offset will be returned.
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//
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// If the offset is out of bounds, NULL will be returned. Errors might
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// be returned if we fail to fetch the span.
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struct eggsfs_span* eggsfs_get_span(struct eggsfs_inode* enode, u64 offset);
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// The page_ix is the page number inside the span.
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struct page* eggsfs_get_span_page(struct eggsfs_block_span* span, u32 page_ix);
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void eggsfs_file_spans_cb_span(void* data, u64 offset, u32 size, u32 crc, u8 storage_class, u8 parity, u8 stripes, u32 cell_size, const uint32_t* stripes_crcs);
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void eggsfs_file_spans_cb_block(
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void* data, int block_ix,
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// block service stuff
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u64 bs_id, u32 ip1, u16 port1, u32 ip2, u16 port2,
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// block stuff
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u64 block_id, u32 crc
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);
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void eggsfs_file_spans_cb_inline_span(void* data, u64 offset, u32 size, u8 len, const char* body);
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#endif
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