SSL fdtable.h Interaktion und
PortierbarkeitC

/* 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;
};

/*
* 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);
}

static inline bool close_on_exec(unsigned int fd, const struct files_struct *files)
{
return test_bit(fd, files_fdtable(files)->close_on_exec);
}

struct task_struct;

void put_files_struct(struct files_struct *fs);
int unshare_files(void);
struct fd_range {
unsigned int from, to;
};
struct files_struct *dup_fd(struct files_struct *, struct fd_range *) __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 struct file *file_close_fd(unsigned int fd);

extern struct kmem_cache *files_cachep;

#endif /* __LINUX_FDTABLE_H */

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SSL fdtable.h Interaktion und PortierbarkeitC

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SSL fdtable.h Interaktion und
PortierbarkeitC