diff options
Diffstat (limited to 'block-bochs.c')
| -rw-r--r-- | block-bochs.c | 34 |
1 files changed, 17 insertions, 17 deletions
diff --git a/block-bochs.c b/block-bochs.c index 35e2a6cf0..ca95ae84e 100644 --- a/block-bochs.c +++ b/block-bochs.c @@ -1,9 +1,9 @@ /* * Block driver for the various disk image formats used by Bochs * Currently only for "growing" type in read-only mode - * + * * Copyright (c) 2005 Alex Beregszaszi - * + * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights @@ -44,7 +44,7 @@ struct bochs_header_v1 { char subtype[16]; // "Undoable" / "Volatile" / "Growing" uint32_t version; uint32_t header; // size of header - + union { struct { uint32_t catalog; // num of entries @@ -64,7 +64,7 @@ struct bochs_header { char subtype[16]; // "Undoable" / "Volatile" / "Growing" uint32_t version; uint32_t header; // size of header - + union { struct { uint32_t catalog; // num of entries @@ -83,9 +83,9 @@ typedef struct BDRVBochsState { uint32_t *catalog_bitmap; int catalog_size; - + int data_offset; - + int bitmap_blocks; int extent_blocks; int extent_size; @@ -94,7 +94,7 @@ typedef struct BDRVBochsState { static int bochs_probe(const uint8_t *buf, int buf_size, const char *filename) { const struct bochs_header *bochs = (const void *)buf; - + if (buf_size < HEADER_SIZE) return 0; @@ -121,9 +121,9 @@ static int bochs_open(BlockDriverState *bs, const char *filename, int flags) if (fd < 0) return -1; } - + bs->read_only = 1; // no write support yet - + s->fd = fd; if (read(fd, &bochs, sizeof(bochs)) != sizeof(bochs)) { @@ -161,7 +161,7 @@ static int bochs_open(BlockDriverState *bs, const char *filename, int flags) s->bitmap_blocks = 1 + (le32_to_cpu(bochs.extra.redolog.bitmap) - 1) / 512; s->extent_blocks = 1 + (le32_to_cpu(bochs.extra.redolog.extent) - 1) / 512; - + s->extent_size = le32_to_cpu(bochs.extra.redolog.extent); return 0; @@ -180,7 +180,7 @@ static inline int seek_to_sector(BlockDriverState *bs, int64_t sector_num) // seek to sector extent_index = offset / s->extent_size; extent_offset = (offset % s->extent_size) / 512; - + if (s->catalog_bitmap[extent_index] == 0xffffffff) { // fprintf(stderr, "page not allocated [%x - %x:%x]\n", @@ -191,17 +191,17 @@ static inline int seek_to_sector(BlockDriverState *bs, int64_t sector_num) bitmap_offset = s->data_offset + (512 * s->catalog_bitmap[extent_index] * (s->extent_blocks + s->bitmap_blocks)); block_offset = bitmap_offset + (512 * (s->bitmap_blocks + extent_offset)); - + // fprintf(stderr, "sect: %x [ext i: %x o: %x] -> %x bitmap: %x block: %x\n", // sector_num, extent_index, extent_offset, // le32_to_cpu(s->catalog_bitmap[extent_index]), // bitmap_offset, block_offset); - + // read in bitmap for current extent lseek(s->fd, bitmap_offset + (extent_offset / 8), SEEK_SET); - + read(s->fd, &bitmap_entry, 1); - + if (!((bitmap_entry >> (extent_offset % 8)) & 1)) { // fprintf(stderr, "sector (%x) in bitmap not allocated\n", @@ -210,11 +210,11 @@ static inline int seek_to_sector(BlockDriverState *bs, int64_t sector_num) } lseek(s->fd, block_offset, SEEK_SET); - + return 0; } -static int bochs_read(BlockDriverState *bs, int64_t sector_num, +static int bochs_read(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, int nb_sectors) { BDRVBochsState *s = bs->opaque; |