diff options
Diffstat (limited to 'freebsd/sys/sys/aio.h')
| -rw-r--r-- | freebsd/sys/sys/aio.h | 148 |
1 files changed, 135 insertions, 13 deletions
diff --git a/freebsd/sys/sys/aio.h b/freebsd/sys/sys/aio.h index 02e34a85..ab6f766f 100644 --- a/freebsd/sys/sys/aio.h +++ b/freebsd/sys/sys/aio.h @@ -21,6 +21,11 @@ #include <sys/types.h> #include <sys/signal.h> +#ifdef _KERNEL +#include <sys/queue.h> +#include <sys/event.h> +#include <sys/signalvar.h> +#endif /* * Returned by aio_cancel: @@ -37,6 +42,7 @@ #define LIO_READ 0x2 #ifdef _KERNEL #define LIO_SYNC 0x3 +#define LIO_MLOCK 0x4 #endif /* @@ -45,10 +51,30 @@ #define LIO_NOWAIT 0x0 #define LIO_WAIT 0x1 +#ifndef __rtems__ /* * Maximum number of allowed LIO operations */ #define AIO_LISTIO_MAX 16 +#endif /* __rtems__ */ + +#ifdef _KERNEL + +/* Default values of tunables for the AIO worker pool. */ + +#ifndef MAX_AIO_PROCS +#define MAX_AIO_PROCS 32 +#endif + +#ifndef TARGET_AIO_PROCS +#define TARGET_AIO_PROCS 4 +#endif + +#ifndef AIOD_LIFETIME_DEFAULT +#define AIOD_LIFETIME_DEFAULT (30 * hz) +#endif + +#endif /* * Private members for aiocb -- don't access @@ -78,7 +104,105 @@ typedef struct aiocb { #endif } aiocb_t; -#ifndef _KERNEL +#ifdef _KERNEL + +typedef void aio_cancel_fn_t(struct kaiocb *); +typedef void aio_handle_fn_t(struct kaiocb *); + +/* + * Kernel version of an I/O control block. + * + * Locking key: + * * - need not protected + * a - locked by kaioinfo lock + * b - locked by backend lock + * c - locked by aio_job_mtx + */ +struct kaiocb { + TAILQ_ENTRY(kaiocb) list; /* (b) backend-specific list of jobs */ + TAILQ_ENTRY(kaiocb) plist; /* (a) lists of pending / done jobs */ + TAILQ_ENTRY(kaiocb) allist; /* (a) list of all jobs in proc */ + int jobflags; /* (a) job flags */ + int inblock; /* (*) input blocks */ + int outblock; /* (*) output blocks */ + int msgsnd; /* (*) messages sent */ + int msgrcv; /* (*) messages received */ + struct proc *userproc; /* (*) user process */ + struct ucred *cred; /* (*) active credential when created */ + struct file *fd_file; /* (*) pointer to file structure */ + struct aioliojob *lio; /* (*) optional lio job */ + struct aiocb *ujob; /* (*) pointer in userspace of aiocb */ + struct knlist klist; /* (a) list of knotes */ + struct aiocb uaiocb; /* (*) copy of user I/O control block */ + ksiginfo_t ksi; /* (a) realtime signal info */ + uint64_t seqno; /* (*) job number */ + aio_cancel_fn_t *cancel_fn; /* (a) backend cancel function */ + aio_handle_fn_t *handle_fn; /* (c) backend handle function */ + union { /* Backend-specific data fields */ + struct { /* BIO backend */ + struct bio *bp; /* (*) BIO pointer */ + struct buf *pbuf; /* (*) buffer pointer */ + struct vm_page *pages[btoc(MAXPHYS)+1]; /* (*) */ + int npages; /* (*) number of pages */ + }; + struct { /* fsync() requests */ + int pending; /* (a) number of pending I/O */ + }; + struct { + void *backend1; + void *backend2; + long backend3; + int backend4; + }; + }; +}; + +struct socket; +struct sockbuf; + +/* + * AIO backends should permit cancellation of queued requests waiting to + * be serviced by installing a cancel routine while the request is + * queued. The cancellation routine should dequeue the request if + * necessary and cancel it. Care must be used to handle races between + * queueing and dequeueing requests and cancellation. + * + * When queueing a request somewhere such that it can be cancelled, the + * caller should: + * + * 1) Acquire lock that protects the associated queue. + * 2) Call aio_set_cancel_function() to install the cancel routine. + * 3) If that fails, the request has a pending cancel and should be + * cancelled via aio_cancel(). + * 4) Queue the request. + * + * When dequeueing a request to service it or hand it off to somewhere else, + * the caller should: + * + * 1) Acquire the lock that protects the associated queue. + * 2) Dequeue the request. + * 3) Call aio_clear_cancel_function() to clear the cancel routine. + * 4) If that fails, the cancel routine is about to be called. The + * caller should ignore the request. + * + * The cancel routine should: + * + * 1) Acquire the lock that protects the associated queue. + * 2) Call aio_cancel_cleared() to determine if the request is already + * dequeued due to a race with dequeueing thread. + * 3) If that fails, dequeue the request. + * 4) Cancel the request via aio_cancel(). + */ + +bool aio_cancel_cleared(struct kaiocb *job); +void aio_cancel(struct kaiocb *job); +bool aio_clear_cancel_function(struct kaiocb *job); +void aio_complete(struct kaiocb *job, long status, int error); +void aio_schedule(struct kaiocb *job, aio_handle_fn_t *func); +bool aio_set_cancel_function(struct kaiocb *job, aio_cancel_fn_t *func); +void aio_switch_vmspace(struct kaiocb *job); + +#else /* !_KERNEL */ struct timespec; @@ -99,7 +223,8 @@ int aio_write(struct aiocb *); * "acb_list" is an array of "nacb_listent" I/O control blocks. * when all I/Os are complete, the optional signal "sig" is sent. */ -int lio_listio(int, struct aiocb * const [], int, struct sigevent *); +int lio_listio(int, struct aiocb *__restrict const *__restrict, int, + struct sigevent *); /* * Get completion status @@ -126,21 +251,18 @@ int aio_cancel(int, struct aiocb *); */ int aio_suspend(const struct aiocb * const[], int, const struct timespec *); +/* + * Asynchronous mlock + */ +int aio_mlock(struct aiocb *); + #ifdef __BSD_VISIBLE -int aio_waitcomplete(struct aiocb **, struct timespec *); +ssize_t aio_waitcomplete(struct aiocb **, struct timespec *); #endif int aio_fsync(int op, struct aiocb *aiocbp); __END_DECLS -#else +#endif /* !_KERNEL */ -/* Forward declarations for prototypes below. */ -struct socket; -struct sockbuf; - -extern void (*aio_swake)(struct socket *, struct sockbuf *); - -#endif - -#endif +#endif /* !_SYS_AIO_H_ */ |