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Allow configuring partition offset and size for linux file device. #76

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Allow configuring partition offset and size for linux file device. #76

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24 changes: 22 additions & 2 deletions blockdev/linux/file_dev.c
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Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,12 @@
/**@brief Default filename.*/
static const char *fname = "ext2";

/**@brief Default partition offset.*/
static uint64_t part_offset = 0;

/**@brief Default partition. Zero means the rest of the file.*/
static uint64_t part_size = 0;

/**@brief Image block size.*/
#define EXT4_FILEDEV_BSIZE 512

Expand Down Expand Up @@ -73,8 +79,12 @@ static int file_dev_open(struct ext4_blockdev *bdev)
if (fseeko(dev_file, 0, SEEK_END))
return EFAULT;

file_dev.part_offset = 0;
file_dev.part_size = ftello(dev_file);
file_dev.part_offset = part_offset;
if (part_size) {
file_dev.part_size = part_size;
} else {
file_dev.part_size = ftello(dev_file) - part_offset;
}
file_dev.bdif->ph_bcnt = file_dev.part_size / file_dev.bdif->ph_bsize;

return EOK;
Expand Down Expand Up @@ -140,3 +150,13 @@ void file_dev_name_set(const char *n)
fname = n;
}
/******************************************************************************/
void file_dev_part_offset_set(const uint64_t n)
{
part_offset = n;
}
/******************************************************************************/
void file_dev_part_size_set(const uint64_t n)
{
part_size = n;
}
/******************************************************************************/
6 changes: 6 additions & 0 deletions blockdev/linux/file_dev.h
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Original file line number Diff line number Diff line change
Expand Up @@ -40,4 +40,10 @@ struct ext4_blockdev *file_dev_get(void);
/**@brief Set filename to open.*/
void file_dev_name_set(const char *n);

/**@brief Set partition offset .*/
void file_dev_part_offset_set(const uint64_t n);

/**@brief Set partition size .*/
void file_dev_part_size_set(const uint64_t n);

#endif /* FILE_DEV_H_ */