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scst: Export scst_tgt->sg_tablesize via sysfs

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This value is available in initiator mode via
/sys/class/scsi_host/hostN/sg_tablesize; make it available in target
mode as well.  Userspace code may use it when making decisions about
buffer sizes.

Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
This commit is contained in:
Tony Battersby
2025-09-08 16:10:42 +03:00
committed by Gleb Chesnokov
parent 70e0d81436
commit f8bfa638b6
1 changed files with 21 additions and 0 deletions
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21
scst/src/scst_sysfs.c
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@@ -2718,6 +2718,26 @@ out:
static struct kobj_attribute scst_tgt_comment =
__ATTR(comment, 0644, scst_tgt_comment_show, scst_tgt_comment_store);
static ssize_t scst_tgt_sg_tablesize_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct scst_tgt *tgt;
int ret;
TRACE_ENTRY();
tgt = container_of(kobj, struct scst_tgt, tgt_kobj);
ret = sysfs_emit(buf, "%d\n", tgt->sg_tablesize);
TRACE_EXIT_RES(ret);
return ret;
}
static struct kobj_attribute scst_tgt_sg_tablesize =
__ATTR(sg_tablesize, 0444, scst_tgt_sg_tablesize_show, NULL);
/*
* Creates an attribute entry for one target. Allows for target driver to
* create an attribute that is not for every target.
@@ -2910,6 +2930,7 @@ static struct attribute *scst_tgt_attrs[] = {
&scst_tgt_aen_disabled.attr,
&scst_tgt_forwarding.attr,
&scst_tgt_comment.attr,
&scst_tgt_sg_tablesize.attr,
&scst_tgt_addr_method.attr,
&scst_tgt_io_grouping_type.attr,
&scst_tgt_black_hole.attr,