add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/scsi/qedf/qedf_debugfs.c
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@@ -8,6 +8,7 @@
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 #include <linux/uaccess.h>
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 #include <linux/debugfs.h>
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 #include <linux/module.h>
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+#include <linux/vmalloc.h>
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 #include "qedf.h"
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 #include "qedf_dbg.h"
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@@ -98,7 +99,9 @@
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 qedf_dbg_fp_int_cmd_read(struct file *filp, char __user *buffer, size_t count,
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 			 loff_t *ppos)
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 {
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+	ssize_t ret;
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 	size_t cnt = 0;
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+	char *cbuf;
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 	int id;
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 	struct qedf_fastpath *fp = NULL;
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 	struct qedf_dbg_ctx *qedf_dbg =
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@@ -108,19 +111,25 @@
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 	QEDF_INFO(qedf_dbg, QEDF_LOG_DEBUGFS, "entered\n");
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-	cnt = sprintf(buffer, "\nFastpath I/O completions\n\n");
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+	cbuf = vmalloc(QEDF_DEBUGFS_LOG_LEN);
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+	if (!cbuf)
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+		return 0;
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+
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+	cnt += scnprintf(cbuf + cnt, QEDF_DEBUGFS_LOG_LEN - cnt, "\nFastpath I/O completions\n\n");
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 	for (id = 0; id < qedf->num_queues; id++) {
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 		fp = &(qedf->fp_array[id]);
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 		if (fp->sb_id == QEDF_SB_ID_NULL)
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 			continue;
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-		cnt += sprintf((buffer + cnt), "#%d: %lu\n", id,
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-			       fp->completions);
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+		cnt += scnprintf(cbuf + cnt, QEDF_DEBUGFS_LOG_LEN - cnt,
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+				 "#%d: %lu\n", id, fp->completions);
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 	}
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-	cnt = min_t(int, count, cnt - *ppos);
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-	*ppos += cnt;
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-	return cnt;
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+	ret = simple_read_from_buffer(buffer, count, ppos, cbuf, cnt);
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+
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+	vfree(cbuf);
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+
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+	return ret;
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 }
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 static ssize_t
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@@ -138,15 +147,14 @@
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 			loff_t *ppos)
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 {
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 	int cnt;
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+	char cbuf[32];
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 	struct qedf_dbg_ctx *qedf_dbg =
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 				(struct qedf_dbg_ctx *)filp->private_data;
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 	QEDF_INFO(qedf_dbg, QEDF_LOG_DEBUGFS, "debug mask=0x%x\n", qedf_debug);
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-	cnt = sprintf(buffer, "debug mask = 0x%x\n", qedf_debug);
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+	cnt = scnprintf(cbuf, sizeof(cbuf), "debug mask = 0x%x\n", qedf_debug);
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-	cnt = min_t(int, count, cnt - *ppos);
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-	*ppos += cnt;
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-	return cnt;
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+	return simple_read_from_buffer(buffer, count, ppos, cbuf, cnt);
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 }
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 static ssize_t
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@@ -185,18 +193,17 @@
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 				   size_t count, loff_t *ppos)
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 {
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 	int cnt;
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+	char cbuf[7];
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 	struct qedf_dbg_ctx *qedf_dbg =
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 				(struct qedf_dbg_ctx *)filp->private_data;
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 	struct qedf_ctx *qedf = container_of(qedf_dbg,
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 	    struct qedf_ctx, dbg_ctx);
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 	QEDF_INFO(qedf_dbg, QEDF_LOG_DEBUGFS, "entered\n");
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-	cnt = sprintf(buffer, "%s\n",
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+	cnt = scnprintf(cbuf, sizeof(cbuf), "%s\n",
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 	    qedf->stop_io_on_error ? "true" : "false");
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-	cnt = min_t(int, count, cnt - *ppos);
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-	*ppos += cnt;
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-	return cnt;
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+	return simple_read_from_buffer(buffer, count, ppos, cbuf, cnt);
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 }
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 static ssize_t