From: "Eric W. Biederman" <ebiederm@xmission.com>
To: linux-kernel@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org, criu@openvz.org,
bpf@vger.kernel.org,
"Linus Torvalds" <torvalds@linux-foundation.org>,
"Alexander Viro" <viro@zeniv.linux.org.uk>,
"Christian Brauner" <christian.brauner@ubuntu.com>,
"Oleg Nesterov" <oleg@redhat.com>,
"Cyrill Gorcunov" <gorcunov@gmail.com>,
"Jann Horn" <jann@thejh.net>, "Kees Cook" <keescook@chromium.org>,
"Daniel P. Berrangé" <berrange@redhat.com>,
"Jeff Layton" <jlayton@redhat.com>,
"Miklos Szeredi" <miklos@szeredi.hu>,
"Matthew Wilcox" <willy@debian.org>,
"J. Bruce Fields" <bfields@fieldses.org>,
"Matthew Wilcox" <matthew@wil.cx>,
"Trond Myklebust" <trond.myklebust@fys.uio.no>,
"Chris Wright" <chrisw@redhat.com>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Martin KaFai Lau" <kafai@fb.com>,
"Song Liu" <songliubraving@fb.com>, "Yonghong Song" <yhs@fb.com>,
"Andrii Nakryiko" <andriin@fb.com>,
"John Fastabend" <john.fastabend@gmail.com>,
"KP Singh" <kpsingh@chromium.org>,
"Eric W. Biederman" <ebiederm@xmission.com>
Subject: [PATCH 17/17] file: Rename __close_fd to close_fd and remove the files parameter
Date: Mon, 17 Aug 2020 17:04:25 -0500 [thread overview]
Message-ID: <20200817220425.9389-17-ebiederm@xmission.com> (raw)
In-Reply-To: <87ft8l6ic3.fsf@x220.int.ebiederm.org>
The function __close_fd was added to support binder[1]. Now that
binder has been fixed to no longer need __close_fd[2] and
get_files_struct has been removed it is no longer possible to
correctly call __close_fd with anything current->files pass as it's
files parameter.
Therefore transform the files parameter into a local variable
initialized to current->files, and rename __close_fd to close_fd to
reflect this change, and keep it in sync with the similar changes to
__alloc_fd, and __fd_install.
This removes the need for callers to care about the extra care that
needs to be take if anything except current->files is passed, by
limiting the callers to only operation on current->files.
[1] 483ce1d4b8c3 ("take descriptor-related part of close() to file.c")
[2] 44d8047f1d87 ("binder: use standard functions to allocate fds")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
fs/file.c | 10 ++++------
fs/open.c | 2 +-
include/linux/fdtable.h | 3 +--
include/linux/syscalls.h | 6 +++---
4 files changed, 9 insertions(+), 12 deletions(-)
diff --git a/fs/file.c b/fs/file.c
index 221fc4f97f61..b06b04d65070 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -614,11 +614,9 @@ static struct file *pick_file(struct files_struct *files, unsigned fd)
return file;
}
-/*
- * The same warnings as for __alloc_fd()/__fd_install() apply here...
- */
-int __close_fd(struct files_struct *files, unsigned fd)
+int close_fd(unsigned fd)
{
+ struct files_struct *files = current->files;
struct file *file;
file = pick_file(files, fd);
@@ -627,7 +625,7 @@ int __close_fd(struct files_struct *files, unsigned fd)
return filp_close(file, files);
}
-EXPORT_SYMBOL(__close_fd); /* for ksys_close() */
+EXPORT_SYMBOL(close_fd); /* for ksys_close() */
/**
* __close_range() - Close all file descriptors in a given range.
@@ -1010,7 +1008,7 @@ int replace_fd(unsigned fd, struct file *file, unsigned flags)
struct files_struct *files = current->files;
if (!file)
- return __close_fd(files, fd);
+ return close_fd(fd);
if (fd >= rlimit(RLIMIT_NOFILE))
return -EBADF;
diff --git a/fs/open.c b/fs/open.c
index 9af548fb841b..581a674d7eee 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -1292,7 +1292,7 @@ EXPORT_SYMBOL(filp_close);
*/
SYSCALL_DEFINE1(close, unsigned int, fd)
{
- int retval = __close_fd(current->files, fd);
+ int retval = close_fd(fd);
/* can't restart close syscall because file table entry was cleared */
if (unlikely(retval == -ERESTARTSYS ||
diff --git a/include/linux/fdtable.h b/include/linux/fdtable.h
index d8f6c4921d85..d1b8f3d85493 100644
--- a/include/linux/fdtable.h
+++ b/include/linux/fdtable.h
@@ -116,8 +116,7 @@ int iterate_fd(struct files_struct *, unsigned,
int (*)(const void *, struct file *, unsigned),
const void *);
-extern int __close_fd(struct files_struct *files,
- unsigned int fd);
+extern int close_fd(unsigned int fd);
extern int __close_range(unsigned int fd, unsigned int max_fd, unsigned int flags);
extern int __close_fd_get_file(unsigned int fd, struct file **res);
extern int unshare_fd(unsigned long unshare_flags, unsigned int max_fds,
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 75ac7f8ae93c..a3f48cf49206 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -1293,16 +1293,16 @@ static inline long ksys_ftruncate(unsigned int fd, loff_t length)
return do_sys_ftruncate(fd, length, 1);
}
-extern int __close_fd(struct files_struct *files, unsigned int fd);
+extern int close_fd(unsigned int fd);
/*
* In contrast to sys_close(), this stub does not check whether the syscall
* should or should not be restarted, but returns the raw error codes from
- * __close_fd().
+ * close_fd().
*/
static inline int ksys_close(unsigned int fd)
{
- return __close_fd(current->files, fd);
+ return close_fd(fd);
}
extern long do_sys_truncate(const char __user *pathname, loff_t length);
--
2.25.0
next prev parent reply other threads:[~2020-08-17 22:13 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-17 22:03 exec: Move unshare_files and guarantee files_struct.count is correct Eric W. Biederman
2020-08-17 22:04 ` [PATCH 01/17] exec: Move unshare_files to fix posix file locking during exec Eric W. Biederman
2020-08-18 10:04 ` Christian Brauner
2020-08-17 22:04 ` [PATCH 02/17] exec: Simplify unshare_files Eric W. Biederman
2020-08-18 10:08 ` Christian Brauner
2020-08-17 22:04 ` [PATCH 03/17] exec: Remove reset_files_struct Eric W. Biederman
2020-08-18 10:09 ` Christian Brauner
2020-08-17 22:04 ` [PATCH 04/17] kcmp: In kcmp_epoll_target use fget_task Eric W. Biederman
2020-08-20 21:45 ` Cyrill Gorcunov
2020-08-17 22:04 ` [PATCH 05/17] bpf: In bpf_task_fd_query " Eric W. Biederman
2020-08-17 22:04 ` [PATCH 06/17] file: Implement fcheck_task Eric W. Biederman
2020-08-18 10:37 ` Christian Brauner
2020-08-17 22:04 ` [PATCH 07/17] proc/fd: In tid_fd_mode use fcheck_task Eric W. Biederman
2020-08-18 10:36 ` Christian Brauner
2020-08-17 22:04 ` [PATCH 08/17] proc/fd: In proc_fd_link " Eric W. Biederman
2020-08-18 10:36 ` Christian Brauner
2020-08-17 22:04 ` [PATCH 09/17] file: Implement fnext_task Eric W. Biederman
2020-08-17 23:54 ` Linus Torvalds
[not found] ` <875z9g7oln.fsf@x220.int.ebiederm.org>
2020-08-18 1:17 ` Linus Torvalds
2020-08-18 11:05 ` Christian Brauner
[not found] ` <87pn7m22kn.fsf@x220.int.ebiederm.org>
2020-08-19 15:54 ` Alexei Starovoitov
[not found] ` <871rk0t45v.fsf@x220.int.ebiederm.org>
2020-08-21 16:17 ` Alexei Starovoitov
2020-08-19 18:32 ` Linus Torvalds
2020-08-20 21:50 ` Cyrill Gorcunov
2020-08-17 22:04 ` [PATCH 10/17] proc/fd: In proc_readfd_common use fnext_task Eric W. Biederman
2020-08-18 2:22 ` Al Viro
[not found] ` <87sgck4o23.fsf@x220.int.ebiederm.org>
2020-08-18 4:59 ` Alexei Starovoitov
2020-08-17 22:04 ` [PATCH 11/17] bpf/task_iter: In task_file_seq_get_next " Eric W. Biederman
2020-08-18 5:39 ` kernel test robot
2020-08-18 12:54 ` Eric W. Biederman
2020-08-17 22:04 ` [PATCH 12/17] proc/fd: In fdinfo seq_show don't use get_files_struct Eric W. Biederman
2020-08-18 0:08 ` Linus Torvalds
[not found] ` <87v9hg69ph.fsf@x220.int.ebiederm.org>
2020-08-18 1:21 ` Linus Torvalds
2020-08-18 10:43 ` Christian Brauner
2020-08-17 22:04 ` [PATCH 13/17] file: Remove get_files_struct Eric W. Biederman
2020-08-18 10:39 ` Christian Brauner
2020-08-17 22:04 ` [PATCH 14/17] file: Merge __fd_install into fd_install Eric W. Biederman
2020-08-18 10:15 ` Christian Brauner
2020-08-17 22:04 ` [PATCH 15/17] file: In f_dupfd read RLIMIT_NOFILE once Eric W. Biederman
2020-08-18 10:12 ` Christian Brauner
2020-08-17 22:04 ` [PATCH 16/17] file: Merge __alloc_fd into alloc_fd Eric W. Biederman
2020-08-18 10:17 ` Christian Brauner
2020-08-17 22:04 ` Eric W. Biederman [this message]
2020-08-18 10:19 ` [PATCH 17/17] file: Rename __close_fd to close_fd and remove the files parameter Christian Brauner
2020-08-18 11:20 ` Christoph Hellwig
2020-08-18 12:48 ` Eric W. Biederman
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