#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/file.h>
+#include <linux/fdtable.h>
#include <linux/capability.h>
#include <linux/dnotify.h>
-#include <linux/smp_lock.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/security.h>
* file_lock held for write.
*/
-static int locate_fd(struct files_struct *files,
- struct file *file, unsigned int orig_start)
+static int locate_fd(unsigned int orig_start, int cloexec)
{
+ struct files_struct *files = current->files;
unsigned int newfd;
unsigned int start;
int error;
struct fdtable *fdt;
+ spin_lock(&files->file_lock);
+
error = -EINVAL;
if (orig_start >= current->signal->rlim[RLIMIT_NOFILE].rlim_cur)
goto out;
if (error)
goto repeat;
- /*
- * We reacquired files_lock, so we are safe as long as
- * we reacquire the fdtable pointer and use it while holding
- * the lock, no one can free it during that time.
- */
if (start <= files->next_fd)
files->next_fd = newfd + 1;
+ FD_SET(newfd, fdt->open_fds);
+ if (cloexec)
+ FD_SET(newfd, fdt->close_on_exec);
+ else
+ FD_CLR(newfd, fdt->close_on_exec);
error = newfd;
-
+
out:
+ spin_unlock(&files->file_lock);
return error;
}
static int dupfd(struct file *file, unsigned int start, int cloexec)
{
- struct files_struct * files = current->files;
- struct fdtable *fdt;
- int fd;
-
- spin_lock(&files->file_lock);
- fd = locate_fd(files, file, start);
- if (fd >= 0) {
- /* locate_fd() may have expanded fdtable, load the ptr */
- fdt = files_fdtable(files);
- FD_SET(fd, fdt->open_fds);
- if (cloexec)
- FD_SET(fd, fdt->close_on_exec);
- else
- FD_CLR(fd, fdt->close_on_exec);
- spin_unlock(&files->file_lock);
+ int fd = locate_fd(start, cloexec);
+ if (fd >= 0)
fd_install(fd, file);
- } else {
- spin_unlock(&files->file_lock);
+ else
fput(file);
- }
return fd;
}
if (error)
return error;
- lock_kernel();
if ((arg ^ filp->f_flags) & FASYNC) {
if (filp->f_op && filp->f_op->fasync) {
error = filp->f_op->fasync(fd, filp, (arg & FASYNC) != 0);
filp->f_flags = (arg & SETFL_MASK) | (filp->f_flags & ~SETFL_MASK);
out:
- unlock_kernel();
return error;
}