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24 linhas
921 B
24 linhas
921 B
#ifndef __KERN_FS_IOBUF_H__
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#define __KERN_FS_IOBUF_H__
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#include <defs.h>
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/*
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* iobuf is a buffer Rd/Wr status record
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*/
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struct iobuf {
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void *io_base; // the base addr of buffer (used for Rd/Wr)
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off_t io_offset; // current Rd/Wr position in buffer, will have been incremented by the amount transferred
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size_t io_len; // the length of buffer (used for Rd/Wr)
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size_t io_resid; // current resident length need to Rd/Wr, will have been decremented by the amount transferred.
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};
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#define iobuf_used(iob) ((size_t)((iob)->io_len - (iob)->io_resid))
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struct iobuf *iobuf_init(struct iobuf *iob, void *base, size_t len, off_t offset);
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int iobuf_move(struct iobuf *iob, void *data, size_t len, bool m2b, size_t *copiedp);
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int iobuf_move_zeros(struct iobuf *iob, size_t len, size_t *copiedp);
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void iobuf_skip(struct iobuf *iob, size_t n);
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#endif /* !__KERN_FS_IOBUF_H__ */
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