Contributors: 26
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Al Viro |
121 |
23.09% |
7 |
11.11% |
| Linus Torvalds |
69 |
13.17% |
5 |
7.94% |
| Linus Torvalds (pre-git) |
59 |
11.26% |
11 |
17.46% |
| David Howells |
40 |
7.63% |
2 |
3.17% |
| Christian Brauner |
33 |
6.30% |
4 |
6.35% |
| Eric W. Biedermann |
27 |
5.15% |
8 |
12.70% |
| Dipankar Sarma |
23 |
4.39% |
2 |
3.17% |
| Oleg Nesterov |
21 |
4.01% |
1 |
1.59% |
| Eric Dumazet |
18 |
3.44% |
2 |
3.17% |
| Paul E. McKenney |
15 |
2.86% |
4 |
6.35% |
| Janak Desai |
14 |
2.67% |
1 |
1.59% |
| Vadim Lobanov |
12 |
2.29% |
1 |
1.59% |
| Dan J Williams |
10 |
1.91% |
1 |
1.59% |
| Dave Hansen |
9 |
1.72% |
1 |
1.59% |
| Ingo Molnar |
9 |
1.72% |
2 |
3.17% |
| Emese Revfy |
8 |
1.53% |
1 |
1.59% |
| Todd Kjos |
7 |
1.34% |
1 |
1.59% |
| Christoph Lameter |
6 |
1.15% |
1 |
1.59% |
| Sargun Dhillon |
5 |
0.95% |
1 |
1.59% |
| Harvey Harrison |
5 |
0.95% |
1 |
1.59% |
| Alexey Dobriyan |
3 |
0.57% |
1 |
1.59% |
| Andrew Morton |
3 |
0.57% |
1 |
1.59% |
| Arnd Bergmann |
3 |
0.57% |
1 |
1.59% |
| Daniel Jacobowitz |
2 |
0.38% |
1 |
1.59% |
| Arun Sharma |
1 |
0.19% |
1 |
1.59% |
| Greg Kroah-Hartman |
1 |
0.19% |
1 |
1.59% |
| Total |
524 |
|
63 |
|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* descriptor table internals; you almost certainly want file.h instead.
*/
#ifndef __LINUX_FDTABLE_H
#define __LINUX_FDTABLE_H
#include <linux/posix_types.h>
#include <linux/compiler.h>
#include <linux/spinlock.h>
#include <linux/rcupdate.h>
#include <linux/nospec.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/atomic.h>
/*
* The default fd array needs to be at least BITS_PER_LONG,
* as this is the granularity returned by copy_fdset().
*/
#define NR_OPEN_DEFAULT BITS_PER_LONG
#define NR_OPEN_MAX ~0U
struct fdtable {
unsigned int max_fds;
struct file __rcu **fd; /* current fd array */
unsigned long *close_on_exec;
unsigned long *open_fds;
unsigned long *full_fds_bits;
struct rcu_head rcu;
};
static inline bool close_on_exec(unsigned int fd, const struct fdtable *fdt)
{
return test_bit(fd, fdt->close_on_exec);
}
static inline bool fd_is_open(unsigned int fd, const struct fdtable *fdt)
{
return test_bit(fd, fdt->open_fds);
}
/*
* Open file table structure
*/
struct files_struct {
/*
* read mostly part
*/
atomic_t count;
bool resize_in_progress;
wait_queue_head_t resize_wait;
struct fdtable __rcu *fdt;
struct fdtable fdtab;
/*
* written part on a separate cache line in SMP
*/
spinlock_t file_lock ____cacheline_aligned_in_smp;
unsigned int next_fd;
unsigned long close_on_exec_init[1];
unsigned long open_fds_init[1];
unsigned long full_fds_bits_init[1];
struct file __rcu * fd_array[NR_OPEN_DEFAULT];
};
struct file_operations;
struct vfsmount;
struct dentry;
#define rcu_dereference_check_fdtable(files, fdtfd) \
rcu_dereference_check((fdtfd), lockdep_is_held(&(files)->file_lock))
#define files_fdtable(files) \
rcu_dereference_check_fdtable((files), (files)->fdt)
/*
* The caller must ensure that fd table isn't shared or hold rcu or file lock
*/
static inline struct file *files_lookup_fd_raw(struct files_struct *files, unsigned int fd)
{
struct fdtable *fdt = rcu_dereference_raw(files->fdt);
unsigned long mask = array_index_mask_nospec(fd, fdt->max_fds);
struct file *needs_masking;
/*
* 'mask' is zero for an out-of-bounds fd, all ones for ok.
* 'fd&mask' is 'fd' for ok, or 0 for out of bounds.
*
* Accessing fdt->fd[0] is ok, but needs masking of the result.
*/
needs_masking = rcu_dereference_raw(fdt->fd[fd&mask]);
return (struct file *)(mask & (unsigned long)needs_masking);
}
static inline struct file *files_lookup_fd_locked(struct files_struct *files, unsigned int fd)
{
RCU_LOCKDEP_WARN(!lockdep_is_held(&files->file_lock),
"suspicious rcu_dereference_check() usage");
return files_lookup_fd_raw(files, fd);
}
struct file *lookup_fdget_rcu(unsigned int fd);
struct file *task_lookup_fdget_rcu(struct task_struct *task, unsigned int fd);
struct file *task_lookup_next_fdget_rcu(struct task_struct *task, unsigned int *fd);
struct task_struct;
void put_files_struct(struct files_struct *fs);
int unshare_files(void);
struct files_struct *dup_fd(struct files_struct *, unsigned, int *) __latent_entropy;
void do_close_on_exec(struct files_struct *);
int iterate_fd(struct files_struct *, unsigned,
int (*)(const void *, struct file *, unsigned),
const void *);
extern int close_fd(unsigned int fd);
extern int __close_range(unsigned int fd, unsigned int max_fd, unsigned int flags);
extern struct file *file_close_fd(unsigned int fd);
extern int unshare_fd(unsigned long unshare_flags, unsigned int max_fds,
struct files_struct **new_fdp);
extern struct kmem_cache *files_cachep;
#endif /* __LINUX_FDTABLE_H */