From: Christoph Hellwig <hch@lst.de>
To: Al Viro <viro@zeniv.linux.org.uk>,
Michael Ellerman <mpe@ellerman.id.au>,
x86@kernel.org
Cc: Kees Cook <keescook@chromium.org>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-arch@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: [PATCH 01/11] mem: remove duplicate ops for /dev/zero and /dev/null
Date: Mon, 17 Aug 2020 09:32:02 +0200 [thread overview]
Message-ID: <20200817073212.830069-2-hch@lst.de> (raw)
In-Reply-To: <20200817073212.830069-1-hch@lst.de>
There is no good reason to implement both the traditional ->read and
->write as well as the iter based ops. So implement just the iter
based ones.
Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/char/mem.c | 16 ----------------
1 file changed, 16 deletions(-)
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 687d4af6945d36..14851f36787372 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -670,18 +670,6 @@ static ssize_t write_port(struct file *file, const char __user *buf,
return tmp-buf;
}
-static ssize_t read_null(struct file *file, char __user *buf,
- size_t count, loff_t *ppos)
-{
- return 0;
-}
-
-static ssize_t write_null(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- return count;
-}
-
static ssize_t read_iter_null(struct kiocb *iocb, struct iov_iter *to)
{
return 0;
@@ -872,7 +860,6 @@ static int open_port(struct inode *inode, struct file *filp)
#define zero_lseek null_lseek
#define full_lseek null_lseek
-#define write_zero write_null
#define write_iter_zero write_iter_null
#define open_mem open_port
#define open_kmem open_mem
@@ -903,8 +890,6 @@ static const struct file_operations __maybe_unused kmem_fops = {
static const struct file_operations null_fops = {
.llseek = null_lseek,
- .read = read_null,
- .write = write_null,
.read_iter = read_iter_null,
.write_iter = write_iter_null,
.splice_write = splice_write_null,
@@ -919,7 +904,6 @@ static const struct file_operations __maybe_unused port_fops = {
static const struct file_operations zero_fops = {
.llseek = zero_lseek,
- .write = write_zero,
.read_iter = read_iter_zero,
.write_iter = write_iter_zero,
.mmap = mmap_zero,
--
2.28.0
next prev parent reply other threads:[~2020-08-17 7:32 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-17 7:32 remove the last set_fs() in common code, and remove it for x86 and powerpc Christoph Hellwig
2020-08-17 7:32 ` Christoph Hellwig [this message]
2020-08-18 19:33 ` [PATCH 01/11] mem: remove duplicate ops for /dev/zero and /dev/null Kees Cook
2020-08-17 7:32 ` [PATCH 02/11] fs: don't allow kernel reads and writes without iter ops Christoph Hellwig
2020-08-18 19:34 ` Kees Cook
2020-08-17 7:32 ` [PATCH 03/11] fs: don't allow splice read/write without explicit ops Christoph Hellwig
2020-08-18 19:39 ` Kees Cook
2020-08-18 19:54 ` Christoph Hellwig
2020-08-18 19:58 ` Kees Cook
2020-08-18 20:07 ` Christoph Hellwig
2020-08-17 7:32 ` [PATCH 04/11] uaccess: add infrastructure for kernel builds with set_fs() Christoph Hellwig
2020-08-18 19:40 ` Kees Cook
2020-08-17 7:32 ` [PATCH 05/11] test_bitmap: skip user bitmap tests for !CONFIG_SET_FS Christoph Hellwig
2020-08-17 7:50 ` Christophe Leroy
2020-08-17 7:52 ` Christoph Hellwig
2020-08-18 19:43 ` Kees Cook
2020-08-17 7:32 ` [PATCH 06/11] lkdtm: disable set_fs-based " Christoph Hellwig
2020-08-18 19:32 ` Kees Cook
2020-08-17 7:32 ` [PATCH 07/11] x86: move PAGE_OFFSET, TASK_SIZE & friends to page_{32,64}_types.h Christoph Hellwig
2020-08-18 19:27 ` Kees Cook
2020-08-17 7:32 ` [PATCH 08/11] x86: make TASK_SIZE_MAX usable from assembly code Christoph Hellwig
2020-08-18 19:44 ` Kees Cook
2020-08-18 19:55 ` Christoph Hellwig
2020-08-18 19:59 ` Kees Cook
2020-08-18 20:00 ` Christoph Hellwig
2020-08-18 20:08 ` Kees Cook
2020-08-17 7:32 ` [PATCH 09/11] x86: remove address space overrides using set_fs() Christoph Hellwig
2020-08-17 8:23 ` David Laight
2020-08-27 9:37 ` 'Christoph Hellwig'
2020-08-18 19:46 ` Kees Cook
2020-08-17 7:32 ` [PATCH 10/11] powerpc: use non-set_fs based maccess routines Christoph Hellwig
2020-08-17 15:47 ` Christophe Leroy
2020-08-17 7:32 ` [PATCH 11/11] powerpc: remove address space overrides using set_fs() Christoph Hellwig
2020-08-17 7:39 ` remove the last set_fs() in common code, and remove it for x86 and powerpc Christoph Hellwig
2020-08-18 17:46 ` Christophe Leroy
2020-08-18 18:05 ` Christoph Hellwig
2020-08-18 18:23 ` Christophe Leroy
2020-08-19 7:16 ` Christophe Leroy
2020-08-19 7:22 ` iter and normal ops on /dev/zero & co, was " Christoph Hellwig
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