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Revert r355833

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While it works on nda, it fails on ada and/or da for at least zfs with a modify
after free issue on a trim BIO. Revert while I rework it to fix those devices.
This commit is contained in:
Warner Losh 2019-12-17 21:53:22 +00:00
parent a2c770294a
commit ece56614c8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=355865
1 changed files with 11 additions and 8 deletions
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19
sys/cam/cam_iosched.c
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@ -281,8 +281,6 @@ struct cam_iosched_softc {
int trim_ticks; /* Max ticks to hold trims */
int last_trim_tick; /* Last 'tick' time ld a trim */
int queued_trims; /* Number of trims in the queue */
int max_trims; /* Maximum number of trims pending at once */
int pend_trims; /* Number of pending trims now */
#ifdef CAM_IOSCHED_DYNAMIC
int read_bias; /* Read bias setting */
int current_read_bias; /* Current read bias state */
@ -709,6 +707,11 @@ cam_iosched_cl_maybe_steer(struct control_loop *clp)
}
#endif
/*
* Trim or similar currently pending completion. Should only be set for
* those drivers wishing only one Trim active at a time.
*/
#define CAM_IOSCHED_FLAG_TRIM_ACTIVE (1ul << 0)
/* Callout active, and needs to be torn down */
#define CAM_IOSCHED_FLAG_CALLOUT_ACTIVE (1ul << 1)
@ -781,7 +784,8 @@ cam_iosched_has_more_trim(struct cam_iosched_softc *isc)
return false;
}
return isc->pend_trims <= isc->max_trims && bp != NULL;
/* NB: Should perhaps have a max trim active independent of I/O limiters */
return !(isc->flags & CAM_IOSCHED_FLAG_TRIM_ACTIVE) && bp != NULL;
}
#define cam_iosched_sort_queue(isc) ((isc)->sort_io_queue >= 0 ? \
@ -1105,7 +1109,6 @@ cam_iosched_init(struct cam_iosched_softc **iscp, struct cam_periph *periph)
(*iscp)->sort_io_queue = -1;
bioq_init(&(*iscp)->bio_queue);
bioq_init(&(*iscp)->trim_queue);
(*iscp)->max_trims = 1;
#ifdef CAM_IOSCHED_DYNAMIC
if (do_dynamic_iosched) {
bioq_init(&(*iscp)->write_queue);
@ -1641,7 +1644,7 @@ void
cam_iosched_trim_done(struct cam_iosched_softc *isc)
{
isc->pend_trims--;
isc->flags &= ~CAM_IOSCHED_FLAG_TRIM_ACTIVE;
}
/*
@ -1709,7 +1712,7 @@ void
cam_iosched_submit_trim(struct cam_iosched_softc *isc)
{
isc->pend_trims++;
isc->flags |= CAM_IOSCHED_FLAG_TRIM_ACTIVE;
}
/*
@ -1954,8 +1957,8 @@ DB_SHOW_COMMAND(iosched, cam_iosched_db_show)
db_printf("Trim Q len %d\n", biolen(&isc->trim_queue));
db_printf("read_bias: %d\n", isc->read_bias);
db_printf("current_read_bias: %d\n", isc->current_read_bias);
db_printf("Trims active %d\n", isc->pend_trims);
db_printf("Max trims active %d\n", isc->max_trims);
db_printf("Trim active? %s\n",
(isc->flags & CAM_IOSCHED_FLAG_TRIM_ACTIVE) ? "yes" : "no");
}
#endif
#endif