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-rw-r--r--block/blk-mq-sysfs.c25
1 files changed, 18 insertions, 7 deletions
diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c
index b79685e06b70..279c5d674edf 100644
--- a/block/blk-mq-sysfs.c
+++ b/block/blk-mq-sysfs.c
@@ -141,15 +141,26 @@ static ssize_t blk_mq_sysfs_completed_show(struct blk_mq_ctx *ctx, char *page)
static ssize_t sysfs_list_show(char *page, struct list_head *list, char *msg)
{
- char *start_page = page;
struct request *rq;
+ int len = snprintf(page, PAGE_SIZE - 1, "%s:\n", msg);
+
+ list_for_each_entry(rq, list, queuelist) {
+ const int rq_len = 2 * sizeof(rq) + 2;
+
+ /* if the output will be truncated */
+ if (PAGE_SIZE - 1 < len + rq_len) {
+ /* backspacing if it can't hold '\t...\n' */
+ if (PAGE_SIZE - 1 < len + 5)
+ len -= rq_len;
+ len += snprintf(page + len, PAGE_SIZE - 1 - len,
+ "\t...\n");
+ break;
+ }
+ len += snprintf(page + len, PAGE_SIZE - 1 - len,
+ "\t%p\n", rq);
+ }
- page += sprintf(page, "%s:\n", msg);
-
- list_for_each_entry(rq, list, queuelist)
- page += sprintf(page, "\t%p\n", rq);
-
- return page - start_page;
+ return len;
}
static ssize_t blk_mq_sysfs_rq_list_show(struct blk_mq_ctx *ctx, char *page)