diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/admin-guide/iostats.rst | 5 | ||||
| -rw-r--r-- | Documentation/block/capability.rst | 16 | ||||
| -rw-r--r-- | Documentation/scsi/scsi_mid_low_api.txt | 21 |
3 files changed, 8 insertions, 34 deletions
diff --git a/Documentation/admin-guide/iostats.rst b/Documentation/admin-guide/iostats.rst index df5b8345c41d..9b14b0c2c9c4 100644 --- a/Documentation/admin-guide/iostats.rst +++ b/Documentation/admin-guide/iostats.rst @@ -100,7 +100,7 @@ Field 10 -- # of milliseconds spent doing I/Os (unsigned int) Since 5.0 this field counts jiffies when at least one request was started or completed. If request runs more than 2 jiffies then some - I/O time will not be accounted unless there are other requests. + I/O time might be not accounted in case of concurrent requests. Field 11 -- weighted # of milliseconds spent doing I/Os (unsigned int) This field is incremented at each I/O start, I/O completion, I/O @@ -143,6 +143,9 @@ are summed (possibly overflowing the unsigned long variable they are summed to) and the result given to the user. There is no convenient user interface for accessing the per-CPU counters themselves. +Since 4.19 request times are measured with nanoseconds precision and +truncated to milliseconds before showing in this interface. + Disks vs Partitions ------------------- diff --git a/Documentation/block/capability.rst b/Documentation/block/capability.rst index 2cf258d64bbe..160a5148b915 100644 --- a/Documentation/block/capability.rst +++ b/Documentation/block/capability.rst @@ -2,17 +2,9 @@ Generic Block Device Capability =============================== -This file documents the sysfs file block/<disk>/capability +This file documents the sysfs file ``block/<disk>/capability``. -capability is a hex word indicating which capabilities a specific disk -supports. For more information on bits not listed here, see -include/linux/genhd.h +``capability`` is a bitfield, printed in hexadecimal, indicating which +capabilities a specific block device supports: -GENHD_FL_MEDIA_CHANGE_NOTIFY ----------------------------- - -Value: 4 - -When this bit is set, the disk supports Asynchronous Notification -of media change events. These events will be broadcast to user -space via kernel uevent. +.. kernel-doc:: include/linux/genhd.h diff --git a/Documentation/scsi/scsi_mid_low_api.txt b/Documentation/scsi/scsi_mid_low_api.txt index 2a4be1c3e6db..537f04728487 100644 --- a/Documentation/scsi/scsi_mid_low_api.txt +++ b/Documentation/scsi/scsi_mid_low_api.txt @@ -299,7 +299,6 @@ Summary: scsi_host_alloc - return a new scsi_host instance whose refcount==1 scsi_host_get - increments Scsi_Host instance's refcount scsi_host_put - decrements Scsi_Host instance's refcount (free if 0) - scsi_partsize - parse partition table into cylinders, heads + sectors scsi_register - create and register a scsi host adapter instance. scsi_remove_device - detach and remove a SCSI device scsi_remove_host - detach and remove all SCSI devices owned by host @@ -473,26 +472,6 @@ void scsi_host_put(struct Scsi_Host *shost) /** - * scsi_partsize - parse partition table into cylinders, heads + sectors - * @buf: pointer to partition table - * @capacity: size of (total) disk in 512 byte sectors - * @cyls: outputs number of cylinders calculated via this pointer - * @hds: outputs number of heads calculated via this pointer - * @secs: outputs number of sectors calculated via this pointer - * - * Returns 0 on success, -1 on failure - * - * Might block: no - * - * Notes: Caller owns memory returned (free with kfree() ) - * - * Defined in: drivers/scsi/scsicam.c - **/ -int scsi_partsize(unsigned char *buf, unsigned long capacity, - unsigned int *cyls, unsigned int *hds, unsigned int *secs) - - -/** * scsi_register - create and register a scsi host adapter instance. * @sht: pointer to scsi host template * @privsize: extra bytes to allocate in hostdata array (which is the |