Release 4.16 include/linux/fdtable.h
/* 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
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);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
David Howells | 26 | 96.30% | 2 | 66.67% |
Alexey Dobriyan | 1 | 3.70% | 1 | 33.33% |
Total | 27 | 100.00% | 3 | 100.00% |
static inline bool fd_is_open(unsigned int fd, const struct fdtable *fdt)
{
return test_bit(fd, fdt->open_fds);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
David Howells | 26 | 96.30% | 2 | 66.67% |
Alexey Dobriyan | 1 | 3.70% | 1 | 33.33% |
Total | 27 | 100.00% | 3 | 100.00% |
/*
* 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 *__fcheck_files(struct files_struct *files, unsigned int fd)
{
struct fdtable *fdt = rcu_dereference_raw(files->fdt);
if (fd < fdt->max_fds) {
fd = array_index_nospec(fd, fdt->max_fds);
return rcu_dereference_raw(fdt->fd[fd]);
}
return NULL;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Al Viro | 42 | 64.62% | 1 | 33.33% |
Dan J Williams | 13 | 20.00% | 1 | 33.33% |
Oleg Nesterov | 10 | 15.38% | 1 | 33.33% |
Total | 65 | 100.00% | 3 | 100.00% |
static inline struct file *fcheck_files(struct files_struct *files, unsigned int fd)
{
RCU_LOCKDEP_WARN(!rcu_read_lock_held() &&
!lockdep_is_held(&files->file_lock),
"suspicious rcu_dereference_check() usage");
return __fcheck_files(files, fd);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Oleg Nesterov | 37 | 84.09% | 1 | 33.33% |
Paul E. McKenney | 4 | 9.09% | 1 | 33.33% |
Al Viro | 3 | 6.82% | 1 | 33.33% |
Total | 44 | 100.00% | 3 | 100.00% |
/*
* Check whether the specified fd has an open file.
*/
#define fcheck(fd) fcheck_files(current->files, fd)
struct task_struct;
struct files_struct *get_files_struct(struct task_struct *);
void put_files_struct(struct files_struct *fs);
void reset_files_struct(struct files_struct *);
int unshare_files(struct files_struct **);
struct files_struct *dup_fd(struct files_struct *, 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 __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;
#endif /* __LINUX_FDTABLE_H */
Overall Contributors
Person | Tokens | Prop | Commits | CommitProp |
Al Viro | 298 | 60.57% | 7 | 33.33% |
Oleg Nesterov | 66 | 13.41% | 1 | 4.76% |
David Howells | 66 | 13.41% | 2 | 9.52% |
Dan J Williams | 16 | 3.25% | 1 | 4.76% |
Linus Torvalds | 12 | 2.44% | 1 | 4.76% |
Emese Revfy | 8 | 1.63% | 1 | 4.76% |
Paul E. McKenney | 7 | 1.42% | 2 | 9.52% |
Eric Dumazet | 6 | 1.22% | 1 | 4.76% |
Ingo Molnar | 5 | 1.02% | 1 | 4.76% |
Alexey Dobriyan | 3 | 0.61% | 1 | 4.76% |
Arnd Bergmann | 3 | 0.61% | 1 | 4.76% |
Greg Kroah-Hartman | 1 | 0.20% | 1 | 4.76% |
Arun Sharma | 1 | 0.20% | 1 | 4.76% |
Total | 492 | 100.00% | 21 | 100.00% |
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