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Remove zfs_vdev_elevator module option

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As described in commit f81d5ef6 the zfs_vdev_elevator module
option is being removed.  Users who require this functionality
should update their systems to set the disk scheduler using a
udev rule.

Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: loli10K <ezomori.nozomu@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #8664
Closes #9417
Closes #9609
This commit is contained in:
Brian Behlendorf
2019-11-27 10:35:49 -08:00
committed by GitHub
parent 3c819a2c7d
commit 9e17e6f254
5 changed files with 19 additions and 161 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/os/linux/zfs/vdev_disk.c
+19 -111
View File
@@ -37,7 +37,6 @@
#include <linux/msdos_fs.h>
#include <linux/vfs_compat.h>
char *zfs_vdev_scheduler = VDEV_SCHEDULER;
static void *zfs_vdev_holder = VDEV_HOLDER;
/* size of the "reserved" partition, in blocks */
@@ -141,75 +140,6 @@ vdev_disk_error(zio_t *zio)
zio->io_flags);
}
/*
* Use the Linux 'noop' elevator for zfs managed block devices. This
* strikes the ideal balance by allowing the zfs elevator to do all
* request ordering and prioritization. While allowing the Linux
* elevator to do the maximum front/back merging allowed by the
* physical device. This yields the largest possible requests for
* the device with the lowest total overhead.
*/
static void
vdev_elevator_switch(vdev_t *v, char *elevator)
{
vdev_disk_t *vd = v->vdev_tsd;
struct request_queue *q;
char *device;
int error;
for (int c = 0; c < v->vdev_children; c++)
vdev_elevator_switch(v->vdev_child[c], elevator);
if (!v->vdev_ops->vdev_op_leaf || vd->vd_bdev == NULL)
return;
q = bdev_get_queue(vd->vd_bdev);
device = vd->vd_bdev->bd_disk->disk_name;
/*
* Skip devices which are not whole disks (partitions).
* Device-mapper devices are excepted since they may be whole
* disks despite the vdev_wholedisk flag, in which case we can
* and should switch the elevator. If the device-mapper device
* does not have an elevator (i.e. dm-raid, dm-crypt, etc.) the
* "Skip devices without schedulers" check below will fail.
*/
if (!v->vdev_wholedisk && strncmp(device, "dm-", 3) != 0)
return;
/* Leave existing scheduler when set to "none" */
if ((strncmp(elevator, "none", 4) == 0) && (strlen(elevator) == 4))
return;
/*
* The elevator_change() function was available in kernels from
* 2.6.36 to 4.11. When not available fall back to using the user
* mode helper functionality to set the elevator via sysfs. This
* requires /bin/echo and sysfs to be mounted which may not be true
* early in the boot process.
*/
#ifdef HAVE_ELEVATOR_CHANGE
error = elevator_change(q, elevator);
#else
#define SET_SCHEDULER_CMD \
"exec 0</dev/null " \
" 1>/sys/block/%s/queue/scheduler " \
" 2>/dev/null; " \
"echo %s"
char *argv[] = { "/bin/sh", "-c", NULL, NULL };
char *envp[] = { NULL };
argv[2] = kmem_asprintf(SET_SCHEDULER_CMD, device, elevator);
error = call_usermodehelper(argv[0], argv, envp, UMH_NO_WAIT);
kmem_strfree(argv[2]);
#endif /* HAVE_ELEVATOR_CHANGE */
if (error) {
zfs_dbgmsg("Unable to set \"%s\" scheduler for %s (%s): %d",
elevator, v->vdev_path, device, error);
}
}
static int
vdev_disk_open(vdev_t *v, uint64_t *psize, uint64_t *max_psize,
uint64_t *ashift)
@@ -343,9 +273,6 @@ vdev_disk_open(vdev_t *v, uint64_t *psize, uint64_t *max_psize,
/* Based on the minimum sector size set the block size */
*ashift = highbit64(MAX(block_size, SPA_MINBLOCKSIZE)) - 1;
/* Try to set the io scheduler elevator algorithm */
(void) vdev_elevator_switch(v, zfs_vdev_scheduler);
return (0);
}
@@ -857,44 +784,6 @@ vdev_disk_rele(vdev_t *vd)
/* XXX: Implement me as a vnode rele for the device */
}
static int
param_set_vdev_scheduler(const char *val, zfs_kernel_param_t *kp)
{
spa_t *spa = NULL;
char *p;
if (val == NULL)
return (SET_ERROR(-EINVAL));
if ((p = strchr(val, '\n')) != NULL)
*p = '\0';
if (spa_mode_global != SPA_MODE_UNINIT) {
mutex_enter(&spa_namespace_lock);
while ((spa = spa_next(spa)) != NULL) {
if (spa_state(spa) != POOL_STATE_ACTIVE ||
!spa_writeable(spa) || spa_suspended(spa))
continue;
spa_open_ref(spa, FTAG);
mutex_exit(&spa_namespace_lock);
vdev_elevator_switch(spa->spa_root_vdev, (char *)val);
mutex_enter(&spa_namespace_lock);
spa_close(spa, FTAG);
}
mutex_exit(&spa_namespace_lock);
}
int error = param_set_charp(val, kp);
if (error == 0) {
printk(KERN_INFO "The 'zfs_vdev_scheduler' module option "
"will be removed in a future release.\n");
}
return (error);
}
vdev_ops_t vdev_disk_ops = {
.vdev_op_open = vdev_disk_open,
.vdev_op_close = vdev_disk_close,
@@ -911,6 +800,25 @@ vdev_ops_t vdev_disk_ops = {
.vdev_op_leaf = B_TRUE /* leaf vdev */
};
/*
* The zfs_vdev_scheduler module option has been deprecated. Setting this
* value no longer has any effect. It has not yet been entirely removed
* to allow the module to be loaded if this option is specified in the
* /etc/modprobe.d/zfs.conf file. The following warning will be logged.
*/
static int
param_set_vdev_scheduler(const char *val, zfs_kernel_param_t *kp)
{
int error = param_set_charp(val, kp);
if (error == 0) {
printk(KERN_INFO "The 'zfs_vdev_scheduler' module option "
"is not supported.\n");
}
return (error);
}
char *zfs_vdev_scheduler = "unused";
module_param_call(zfs_vdev_scheduler, param_set_vdev_scheduler,
param_get_charp, &zfs_vdev_scheduler, 0644);
MODULE_PARM_DESC(zfs_vdev_scheduler, "I/O scheduler");