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Diffstat (limited to 'src/spdk/lib/ftl/ftl_addr.h')
| -rw-r--r-- | src/spdk/lib/ftl/ftl_addr.h | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/src/spdk/lib/ftl/ftl_addr.h b/src/spdk/lib/ftl/ftl_addr.h new file mode 100644 index 000000000..36d2ffb00 --- /dev/null +++ b/src/spdk/lib/ftl/ftl_addr.h @@ -0,0 +1,76 @@ +/*- + * BSD LICENSE + * + * Copyright (c) Intel Corporation. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef FTL_ADDR_H +#define FTL_ADDR_H + +#include "spdk/stdinc.h" + +/* Marks address as invalid */ +#define FTL_ADDR_INVALID (-1) +/* Marks LBA as invalid */ +#define FTL_LBA_INVALID ((uint64_t)-1) +/* Smallest data unit size */ +#define FTL_BLOCK_SIZE 4096 + +/* This structure represents on-disk address. It can have one of the following */ +/* formats: */ +/* - offset inside the disk */ +/* - cache_offset inside the cache (indicated by the cached flag) */ +/* - packed version of the two formats above (can be only used when the */ +/* offset can be represented in less than 32 bits) */ +/* Packed format is used, when possible, to avoid wasting RAM on the L2P table. */ +struct ftl_addr { + union { + struct { + uint64_t cache_offset : 63; + uint64_t cached : 1; + }; + + struct { + union { + struct { + uint32_t cache_offset : 31; + uint32_t cached : 1; + }; + + uint32_t offset; + }; + uint32_t rsvd; + } pack; + + uint64_t offset; + }; +}; + +#endif /* FTL_ADDR_H */ |