From 0e9b10a90f1c30f25dd6f130130240745ab14010 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 23 Feb 2013 15:22:43 -0500
Subject: [PATCH] target: writev() on single-element vector is pointless
... in other news:
filp_open() can't return a struct file with NULL dentry
filp_open() can't return a struct file negative dentry
filp_close() of something that never had been in any descriptor
tables is pointless - fput() is all you need
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
drivers/target/target_core_alua.c | 35 ++++++++-----------------------
drivers/target/target_core_pr.c | 27 +++++++-----------------
2 files changed, 17 insertions(+), 45 deletions(-)
diff --git a/drivers/target/target_core_alua.c b/drivers/target/target_core_alua.c
index 7d4ec02e29a97..ff1c5ee352cb9 100644
--- a/drivers/target/target_core_alua.c
+++ b/drivers/target/target_core_alua.c
@@ -27,6 +27,7 @@
#include <linux/spinlock.h>
#include <linux/configfs.h>
#include <linux/export.h>
+#include <linux/file.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <asm/unaligned.h>
@@ -715,36 +716,18 @@ static int core_alua_write_tpg_metadata(
unsigned char *md_buf,
u32 md_buf_len)
{
- mm_segment_t old_fs;
- struct file *file;
- struct iovec iov[1];
- int flags = O_RDWR | O_CREAT | O_TRUNC, ret;
-
- memset(iov, 0, sizeof(struct iovec));
+ struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
+ int ret;
- file = filp_open(path, flags, 0600);
- if (IS_ERR(file) || !file || !file->f_dentry) {
- pr_err("filp_open(%s) for ALUA metadata failed\n",
- path);
+ if (IS_ERR(file)) {
+ pr_err("filp_open(%s) for ALUA metadata failed\n", path);
return -ENODEV;
}
-
- iov[0].iov_base = &md_buf[0];
- iov[0].iov_len = md_buf_len;
-
- old_fs = get_fs();
- set_fs(get_ds());
- ret = vfs_writev(file, &iov[0], 1, &file->f_pos);
- set_fs(old_fs);
-
- if (ret < 0) {
+ ret = kernel_write(file, md_buf, md_buf_len, 0);
+ if (ret < 0)
pr_err("Error writing ALUA metadata file: %s\n", path);
- filp_close(file, NULL);
- return -EIO;
- }
- filp_close(file, NULL);
-
- return 0;
+ fput(file);
+ return ret ? -EIO : 0;
}
/*
diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c
index 8e0290b38e431..3240f2cc81efe 100644
--- a/drivers/target/target_core_pr.c
+++ b/drivers/target/target_core_pr.c
@@ -27,6 +27,7 @@
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/list.h>
+#include <linux/file.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <asm/unaligned.h>
@@ -1957,13 +1958,10 @@ static int __core_scsi3_write_aptpl_to_file(
{
struct t10_wwn *wwn = &dev->t10_wwn;
struct file *file;
- struct iovec iov[1];
- mm_segment_t old_fs;
int flags = O_RDWR | O_CREAT | O_TRUNC;
char path[512];
int ret;
- memset(iov, 0, sizeof(struct iovec));
memset(path, 0, 512);
if (strlen(&wwn->unit_serial[0]) >= 512) {
@@ -1974,31 +1972,22 @@ static int __core_scsi3_write_aptpl_to_file(
snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
file = filp_open(path, flags, 0600);
- if (IS_ERR(file) || !file || !file->f_dentry) {
+ if (IS_ERR(file)) {
pr_err("filp_open(%s) for APTPL metadata"
" failed\n", path);
- return IS_ERR(file) ? PTR_ERR(file) : -ENOENT;
+ return PTR_ERR(file);
}
- iov[0].iov_base = &buf[0];
if (!pr_aptpl_buf_len)
- iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */
- else
- iov[0].iov_len = pr_aptpl_buf_len;
+ pr_aptpl_buf_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */
- old_fs = get_fs();
- set_fs(get_ds());
- ret = vfs_writev(file, &iov[0], 1, &file->f_pos);
- set_fs(old_fs);
+ ret = kernel_write(file, buf, pr_aptpl_buf_len, 0);
- if (ret < 0) {
+ if (ret < 0)
pr_debug("Error writing APTPL metadata file: %s\n", path);
- filp_close(file, NULL);
- return -EIO;
- }
- filp_close(file, NULL);
+ fput(file);
- return 0;
+ return ret ? -EIO : 0;
}
static int
--
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