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Matthew Fioravante
78ef2bb502
This patch adds posix io support (read,write,lseek) to block devices using blkfront. Signed-off-by: Matthew Fioravante <matthew.fioravante@jhuapl.edu> Acked-by: Samuel Thibault <samuel.thibault@ens-lyons.org> Committed-by: Ian Campbell <ian.campbell@citrix.com>
55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
#include <mini-os/wait.h>
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#include <xen/io/blkif.h>
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#include <mini-os/types.h>
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struct blkfront_dev;
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struct blkfront_aiocb
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{
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struct blkfront_dev *aio_dev;
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uint8_t *aio_buf;
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size_t aio_nbytes;
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off_t aio_offset;
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size_t total_bytes;
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uint8_t is_write;
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void *data;
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grant_ref_t gref[BLKIF_MAX_SEGMENTS_PER_REQUEST];
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int n;
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void (*aio_cb)(struct blkfront_aiocb *aiocb, int ret);
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};
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struct blkfront_info
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{
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uint64_t sectors;
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unsigned sector_size;
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int mode;
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int info;
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int barrier;
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int flush;
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};
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struct blkfront_dev *init_blkfront(char *nodename, struct blkfront_info *info);
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#ifdef HAVE_LIBC
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#include <sys/stat.h>
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/* POSIX IO functions:
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* use blkfront_open() to get a file descriptor to the block device
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* Don't use the other blkfront posix functions here directly, instead use
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* read(), write(), lseek() and fstat() on the file descriptor
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*/
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int blkfront_open(struct blkfront_dev *dev);
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int blkfront_posix_rwop(int fd, uint8_t* buf, size_t count, int write);
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#define blkfront_posix_write(fd, buf, count) blkfront_posix_rwop(fd, (uint8_t*)buf, count, 1)
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#define blkfront_posix_read(fd, buf, count) blkfront_posix_rwop(fd, (uint8_t*)buf, count, 0)
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int blkfront_posix_fstat(int fd, struct stat* buf);
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#endif
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void blkfront_aio(struct blkfront_aiocb *aiocbp, int write);
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#define blkfront_aio_read(aiocbp) blkfront_aio(aiocbp, 0)
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#define blkfront_aio_write(aiocbp) blkfront_aio(aiocbp, 1)
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void blkfront_io(struct blkfront_aiocb *aiocbp, int write);
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#define blkfront_read(aiocbp) blkfront_io(aiocbp, 0)
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#define blkfront_write(aiocbp) blkfront_io(aiocbp, 1)
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void blkfront_aio_push_operation(struct blkfront_aiocb *aiocbp, uint8_t op);
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int blkfront_aio_poll(struct blkfront_dev *dev);
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void blkfront_sync(struct blkfront_dev *dev);
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void shutdown_blkfront(struct blkfront_dev *dev);
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extern struct wait_queue_head blkfront_queue;
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