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file: Rename __close_fd to close_fd and remove the files parameter

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The function __close_fd was added to support binder[1].  Now that
binder has been fixed to no longer need __close_fd[2] all calls
to __close_fd pass current->files.

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] 483ce1d4b8 ("take descriptor-related part of close() to file.c")
[2] 44d8047f1d ("binder: use standard functions to allocate fds")
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
v1: https://lkml.kernel.org/r/20200817220425.9389-17-ebiederm@xmission.com
Link: https://lkml.kernel.org/r/20201120231441.29911-21-ebiederm@xmission.com
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2020-11-20 17:14:38 -06:00
parent aa384d10f3
commit 8760c909f5
4 changed files with 9 additions and 12 deletions
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10
fs/file.c
View File

@ -629,11 +629,9 @@ static struct file *pick_file(struct files_struct *files, unsigned fd)
return file; return file;
} }
/* int close_fd(unsigned fd)
* The same warnings as for __alloc_fd()/__fd_install() apply here...
*/
int __close_fd(struct files_struct *files, unsigned fd)
{ {
struct files_struct *files = current->files;
struct file *file; struct file *file;
file = pick_file(files, fd); file = pick_file(files, fd);
@ -642,7 +640,7 @@ int __close_fd(struct files_struct *files, unsigned fd)
return filp_close(file, files); 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. * __close_range() - Close all file descriptors in a given range.
@ -1027,7 +1025,7 @@ int replace_fd(unsigned fd, struct file *file, unsigned flags)
struct files_struct *files = current->files; struct files_struct *files = current->files;
if (!file) if (!file)
return __close_fd(files, fd); return close_fd(fd);
if (fd >= rlimit(RLIMIT_NOFILE)) if (fd >= rlimit(RLIMIT_NOFILE))
return -EBADF; return -EBADF;

2
fs/open.c
View File

@ -1292,7 +1292,7 @@ EXPORT_SYMBOL(filp_close);
*/ */
SYSCALL_DEFINE1(close, unsigned int, fd) 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 */ /* can't restart close syscall because file table entry was cleared */
if (unlikely(retval == -ERESTARTSYS || if (unlikely(retval == -ERESTARTSYS ||

3
include/linux/fdtable.h
View File

@ -124,8 +124,7 @@ int iterate_fd(struct files_struct *, unsigned,
int (*)(const void *, struct file *, unsigned), int (*)(const void *, struct file *, unsigned),
const void *); const void *);
extern int __close_fd(struct files_struct *files, extern int close_fd(unsigned int fd);
unsigned int fd);
extern int __close_range(unsigned int fd, unsigned int max_fd, unsigned int flags); 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 __close_fd_get_file(unsigned int fd, struct file **res);
extern int unshare_fd(unsigned long unshare_flags, unsigned int max_fds, extern int unshare_fd(unsigned long unshare_flags, unsigned int max_fds,

6
include/linux/syscalls.h
View File

@ -1295,16 +1295,16 @@ static inline long ksys_ftruncate(unsigned int fd, loff_t length)
return do_sys_ftruncate(fd, length, 1); 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 * 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 * 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) 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); extern long do_sys_truncate(const char __user *pathname, loff_t length);