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Bound zvol_threads module option

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The zvol_threads module option should be bounded to a reasonable
range.  The taskq must have at least 1 thread and shouldn't have
more than 1,024 at most.  The default value of 32 is a reasonable
default.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3614
This commit is contained in:
Brian Behlendorf 2015-07-27 11:55:03 -07:00
parent 21a96fb635
commit 6339c1b9dc
2 changed files with 5 additions and 4 deletions
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2
man/man5/zfs-module-parameters.5
View File

@ -1567,7 +1567,7 @@ Default value: \fB16,384\fR.
\fBzvol_threads\fR (uint)
.ad
.RS 12n
Number of threads for zvol device
Max number of threads to handle zvol I/O requests
.sp
Default value: \fB32\fR.
.RE

7
module/zfs/zvol.c
View File

@ -1624,6 +1624,7 @@ zvol_set_snapdev(const char *dsname, uint64_t snapdev) {
int
zvol_init(void)
{
int threads = MIN(MAX(zvol_threads, 1), 1024);
int error;
list_create(&zvol_state_list, sizeof (zvol_state_t),
@ -1631,8 +1632,8 @@ zvol_init(void)
mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL);
zvol_taskq = taskq_create(ZVOL_DRIVER, zvol_threads, maxclsyspri,
zvol_threads * 2, INT_MAX, TASKQ_PREPOPULATE | TASKQ_DYNAMIC);
zvol_taskq = taskq_create(ZVOL_DRIVER, threads, maxclsyspri,
threads * 2, INT_MAX, TASKQ_PREPOPULATE | TASKQ_DYNAMIC);
if (zvol_taskq == NULL) {
printk(KERN_INFO "ZFS: taskq_create() failed\n");
error = -ENOMEM;
@ -1677,7 +1678,7 @@ module_param(zvol_major, uint, 0444);
MODULE_PARM_DESC(zvol_major, "Major number for zvol device");
module_param(zvol_threads, uint, 0444);
MODULE_PARM_DESC(zvol_threads, "Number of threads for zvol device");
MODULE_PARM_DESC(zvol_threads, "Max number of threads to handle I/O requests");
module_param(zvol_max_discard_blocks, ulong, 0444);
MODULE_PARM_DESC(zvol_max_discard_blocks, "Max number of blocks to discard");