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Rev | Author | Line No. | Line |
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422 | giacomo | 1 | /* |
2 | * Wrapper functions for accessing the file_struct fd array. |
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3 | */ |
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4 | |||
5 | #ifndef __LINUX_FILE_H |
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6 | #define __LINUX_FILE_H |
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7 | |||
8 | #include <asm/atomic.h> |
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9 | #include <linux/posix_types.h> |
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10 | #include <linux/compiler.h> |
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11 | #include <linux/spinlock.h> |
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12 | |||
13 | /* |
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14 | * The default fd array needs to be at least BITS_PER_LONG, |
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15 | * as this is the granularity returned by copy_fdset(). |
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16 | */ |
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17 | #define NR_OPEN_DEFAULT BITS_PER_LONG |
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18 | |||
19 | /* |
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20 | * Open file table structure |
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21 | */ |
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22 | struct files_struct { |
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23 | atomic_t count; |
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24 | spinlock_t file_lock; /* Protects all the below members. Nests inside tsk->alloc_lock */ |
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25 | int max_fds; |
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26 | int max_fdset; |
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27 | int next_fd; |
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28 | struct file ** fd; /* current fd array */ |
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29 | fd_set *close_on_exec; |
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30 | fd_set *open_fds; |
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31 | fd_set close_on_exec_init; |
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32 | fd_set open_fds_init; |
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33 | struct file * fd_array[NR_OPEN_DEFAULT]; |
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34 | }; |
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35 | |||
36 | extern void FASTCALL(__fput(struct file *)); |
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37 | extern void FASTCALL(fput(struct file *)); |
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38 | |||
39 | static inline void fput_light(struct file *file, int fput_needed) |
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40 | { |
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41 | if (unlikely(fput_needed)) |
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42 | fput(file); |
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43 | } |
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44 | |||
45 | extern struct file * FASTCALL(fget(unsigned int fd)); |
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46 | extern struct file * FASTCALL(fget_light(unsigned int fd, int *fput_needed)); |
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47 | extern void FASTCALL(set_close_on_exec(unsigned int fd, int flag)); |
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48 | extern void put_filp(struct file *); |
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49 | extern int get_unused_fd(void); |
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50 | extern void FASTCALL(put_unused_fd(unsigned int fd)); |
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51 | struct kmem_cache_s; |
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52 | extern void filp_ctor(void * objp, struct kmem_cache_s *cachep, unsigned long cflags); |
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53 | extern void filp_dtor(void * objp, struct kmem_cache_s *cachep, unsigned long dflags); |
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54 | |||
55 | extern struct file ** alloc_fd_array(int); |
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56 | extern int expand_fd_array(struct files_struct *, int nr); |
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57 | extern void free_fd_array(struct file **, int); |
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58 | |||
59 | extern fd_set *alloc_fdset(int); |
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60 | extern int expand_fdset(struct files_struct *, int nr); |
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61 | extern void free_fdset(fd_set *, int); |
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62 | |||
63 | static inline struct file * fcheck_files(struct files_struct *files, unsigned int fd) |
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64 | { |
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65 | struct file * file = NULL; |
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66 | |||
67 | if (fd < files->max_fds) |
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68 | file = files->fd[fd]; |
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69 | return file; |
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70 | } |
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71 | |||
72 | /* |
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73 | * Check whether the specified fd has an open file. |
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74 | */ |
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75 | #define fcheck(fd) fcheck_files(current->files, fd) |
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76 | |||
77 | extern void FASTCALL(fd_install(unsigned int fd, struct file * file)); |
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78 | void FASTCALL(put_files_struct(struct files_struct *fs)); |
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79 | |||
80 | #endif /* __LINUX_FILE_H */ |