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take descriptor-related part of close() to file.c 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-08-19 12:04:24 -04:00
parent 0ee8cdfe6a
commit 483ce1d4b8
4 changed files with 31 additions and 53 deletions
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34
drivers/staging/android/binder.c
View File

@ -390,43 +390,17 @@ static void task_fd_install(
__fd_install(proc->files, fd, file);
}
/*
* copied from __put_unused_fd in open.c
*/
static void __put_unused_fd(struct files_struct *files, unsigned int fd)
{
struct fdtable *fdt = files_fdtable(files);
__clear_open_fd(fd, fdt);
if (fd < files->next_fd)
files->next_fd = fd;
}
/*
* copied from sys_close
*/
static long task_close_fd(struct binder_proc *proc, unsigned int fd)
{
struct file *filp;
struct files_struct *files = proc->files;
struct fdtable *fdt;
int retval;
if (files == NULL)
if (proc->files == NULL)
return -ESRCH;
spin_lock(&files->file_lock);
fdt = files_fdtable(files);
if (fd >= fdt->max_fds)
goto out_unlock;
filp = fdt->fd[fd];
if (!filp)
goto out_unlock;
rcu_assign_pointer(fdt->fd[fd], NULL);
__clear_close_on_exec(fd, fdt);
__put_unused_fd(files, fd);
spin_unlock(&files->file_lock);
retval = filp_close(filp, files);
retval = __close_fd(proc->files, fd);
/* can't restart close syscall because file table entry was cleared */
if (unlikely(retval == -ERESTARTSYS ||
retval == -ERESTARTNOINTR ||
@ -435,10 +409,6 @@ static long task_close_fd(struct binder_proc *proc, unsigned int fd)
retval = -EINTR;
return retval;
out_unlock:
spin_unlock(&files->file_lock);
return -EBADF;
}
static void binder_set_nice(long nice)

26
fs/file.c
View File

@ -626,6 +626,32 @@ void fd_install(unsigned int fd, struct file *file)
EXPORT_SYMBOL(fd_install);
/*
* The same warnings as for __alloc_fd()/__fd_install() apply here...
*/
int __close_fd(struct files_struct *files, unsigned fd)
{
struct file *file;
struct fdtable *fdt;
spin_lock(&files->file_lock);
fdt = files_fdtable(files);
if (fd >= fdt->max_fds)
goto out_unlock;
file = fdt->fd[fd];
if (!file)
goto out_unlock;
rcu_assign_pointer(fdt->fd[fd], NULL);
__clear_close_on_exec(fd, fdt);
__put_unused_fd(files, fd);
spin_unlock(&files->file_lock);
return filp_close(file, files);
out_unlock:
spin_unlock(&files->file_lock);
return -EBADF;
}
struct file *fget(unsigned int fd)
{
struct file *file;

22
fs/open.c
View File

@ -994,23 +994,7 @@ EXPORT_SYMBOL(filp_close);
*/
SYSCALL_DEFINE1(close, unsigned int, fd)
{
struct file * filp;
struct files_struct *files = current->files;
struct fdtable *fdt;
int retval;
spin_lock(&files->file_lock);
fdt = files_fdtable(files);
if (fd >= fdt->max_fds)
goto out_unlock;
filp = fdt->fd[fd];
if (!filp)
goto out_unlock;
rcu_assign_pointer(fdt->fd[fd], NULL);
__clear_close_on_exec(fd, fdt);
__put_unused_fd(files, fd);
spin_unlock(&files->file_lock);
retval = filp_close(filp, files);
int retval = __close_fd(current->files, fd);
/* can't restart close syscall because file table entry was cleared */
if (unlikely(retval == -ERESTARTSYS ||
@ -1020,10 +1004,6 @@ SYSCALL_DEFINE1(close, unsigned int, fd)
retval = -EINTR;
return retval;
out_unlock:
spin_unlock(&files->file_lock);
return -EBADF;
}
EXPORT_SYMBOL(sys_close);

2
include/linux/fdtable.h
View File

@ -123,6 +123,8 @@ extern int __alloc_fd(struct files_struct *files,
unsigned start, unsigned end, unsigned flags);
extern void __fd_install(struct files_struct *files,
unsigned int fd, struct file *file);
extern int __close_fd(struct files_struct *files,
unsigned int fd);
extern struct kmem_cache *files_cachep;