e3a9e1fd62
The current caching layer only has a single buffer for writing and reading. The FAT driver often accesses the fat and then data again, which currently can't be cached. Reimplement this with a list of cached chunks. The number of chunks and their sizes are currently hardcoded, but that could be easily made configurable. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
35 lines
765 B
C
35 lines
765 B
C
#ifndef __BLOCK_H
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#define __BLOCK_H
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#include <driver.h>
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struct block_device;
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struct block_device_ops {
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int (*read)(struct block_device *, void *buf, int block, int num_blocks);
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int (*write)(struct block_device *, const void *buf, int block, int num_blocks);
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int (*read_start)(struct block_device *, void *buf, int block, int num_blocks);
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int (*read_done)(struct block_device *);
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};
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struct chunk;
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struct block_device {
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struct device_d *dev;
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struct block_device_ops *ops;
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int blockbits;
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int num_blocks;
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int rdbufsize;
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int blkmask;
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struct list_head buffered_blocks;
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struct list_head idle_blocks;
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struct cdev cdev;
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};
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int blockdevice_register(struct block_device *blk);
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int blockdevice_unregister(struct block_device *blk);
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#endif /* __BLOCK_H */
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