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v=2.4 cv=IKYyzAvG c=1 sm=1 tr=0 ts=6a61e0d8 cx=c_pps a=OOZaFjgC48PWsiFpTAqLcw==:117 a=OOZaFjgC48PWsiFpTAqLcw==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=RAioF0-LDSMA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=jiCTI4zE5U7BLdzWsZGv:22 a=EIcjfB9IiI4px24ztqRk:22 a=yPCof4ZbAAAA:8 a=S0-NFRiyq58gb8qD-mcA:9 X-Proofpoint-ORIG-GUID: vGrjhrWw095H2DTG4j2ql8WO7KDdilXz X-Proofpoint-GUID: vGrjhrWw095H2DTG4j2ql8WO7KDdilXz X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzIzMDA5NSBTYWx0ZWRfX/ME65A3vNBH9 VyhHNaNrGPK4L6sX486ijth3CAuRVa6mHZBwXiudBk4/UvFP9Lb7QEKr6ViGZucCmrgSX6f5M9v xswNuBZ3KOO5VAROeqxbYxgdzksYqmuMkQ3AIojbN1O2Q3l2kiKzW0/HhZDULbCdDZqw/zaaQ91 tD1zMmmNcJxumTH7+ptja0PLjOFsHZAvluAEniYdzNXBFMK2+9bDthF4CsrVM1jsSMOuYq1BaQS oe1K7HdoPxChqYPD05WBVWhWl3MymqvFw974xiz99s7BL8oEfFYDz7nYMRVRlWKWMjsAZmnt6kD 1e7P5KGsD0UR2PK83nyVVFow4Rp/0DcbauQ7GTK9yx/00OG3X03poo5yVXCVrLzcRO2urlBhnV8 0dPFBhjwbvMYslM37R5DxKBZ1IJf9/e52aiDsScd4gw7b0SpDFFTnv8l+uFpsJsSI+DCNcl8A5f taL1a/Hf8Ntcb+YfQug== Add support in core code for delayed disk removal support. In this, the callback calls into the scsi_driver to do the necessary removal work. The scsi_disk driver (sd) must ensure that the scsi_mpath_device does not go away while the delayed removal work is active, i.e. it must keep a reference. No reference to the scsi_disk multipath structures are kept outside that driver, so that driver needs to provide a scsi_driver.mpath_remove_head callback to do the necessary work. Signed-off-by: John Garry --- drivers/scsi/scsi_multipath.c | 18 ++++++++++++++++++ include/scsi/scsi_driver.h | 4 ++++ 2 files changed, 22 insertions(+) diff --git a/drivers/scsi/scsi_multipath.c b/drivers/scsi/scsi_multipath.c index 6c50fdde70d65..056b9c35d1144 100644 --- a/drivers/scsi/scsi_multipath.c +++ b/drivers/scsi/scsi_multipath.c @@ -362,7 +362,25 @@ static bool scsi_mpath_available_path(struct mpath_device *mpath_device) return false; } +static int scsi_mpath_remove_head_drv(struct device_driver *drv, void *data) +{ + struct scsi_mpath_head *scsi_mpath_head = data; + struct scsi_driver *scsi_driver = to_scsi_driver(drv); + + if (scsi_driver->mpath_remove_head) + scsi_driver->mpath_remove_head(scsi_mpath_head); + + return 0; +} + +static void scsi_mpath_remove_head_work(struct mpath_head *mpath_head) +{ + bus_for_each_drv(&scsi_bus_type, NULL, to_scsi_mpath_head(mpath_head), + scsi_mpath_remove_head_drv); +} + static struct mpath_head_template smpdt = { + .remove_head = scsi_mpath_remove_head_work, .is_disabled = scsi_mpath_is_disabled, .is_optimized = scsi_mpath_is_optimized, .available_path = scsi_mpath_available_path, diff --git a/include/scsi/scsi_driver.h b/include/scsi/scsi_driver.h index 249cea724abd1..d92b63d357f2a 100644 --- a/include/scsi/scsi_driver.h +++ b/include/scsi/scsi_driver.h @@ -8,6 +8,7 @@ struct module; struct request; +struct scsi_mpath_head; struct scsi_driver { struct device_driver gendrv; @@ -22,6 +23,9 @@ struct scsi_driver { int (*done)(struct scsi_cmnd *); int (*eh_action)(struct scsi_cmnd *, int); void (*eh_reset)(struct scsi_cmnd *); + #ifdef CONFIG_SCSI_MULTIPATH + void (*mpath_remove_head)(struct scsi_mpath_head *); + #endif }; #define to_scsi_driver(drv) \ container_of((drv), struct scsi_driver, gendrv) -- 2.43.7