| | 1 | /* |
| | 2 | * Wrapper functions for accessing the file_struct fd array. |
| | 3 | */ |
| | 4 | |
| | 5 | #ifndef __LINUX_FILE_H |
| | 6 | #define __LINUX_FILE_H |
| | 7 | |
| | 8 | #include <linux/compiler.h> |
| | 9 | #include <linux/types.h> |
| | 10 | #include <linux/posix_types.h> |
| | 11 | |
| | 12 | struct file; |
| | 13 | |
| | 14 | extern void fput(struct file *); |
| | 15 | |
| | 16 | struct file_operations; |
| | 17 | struct vfsmount; |
| | 18 | struct dentry; |
| | 19 | struct path; |
| | 20 | extern struct file *alloc_file(const struct path *, fmode_t mode, |
| | 21 | const struct file_operations *fop); |
| | 22 | extern struct file *get_empty_filp(void); |
| | 23 | |
| | 24 | static inline void fput_light(struct file *file, int fput_needed) |
| | 25 | { |
| | 26 | if (fput_needed) |
| | 27 | fput(file); |
| | 28 | } |
| | 29 | |
| | 30 | struct fd { |
| | 31 | struct file *file; |
| | 32 | unsigned int flags; |
| | 33 | }; |
| | 34 | #define FDPUT_FPUT 1 |
| | 35 | #define FDPUT_POS_UNLOCK 2 |
| | 36 | |
| | 37 | static inline void fdput(struct fd fd) |
| | 38 | { |
| | 39 | if (fd.flags & FDPUT_FPUT) |
| | 40 | fput(fd.file); |
| | 41 | } |
| | 42 | |
| | 43 | extern struct file *fget(unsigned int fd); |
| | 44 | extern struct file *fget_raw(unsigned int fd); |
| | 45 | extern unsigned long __fdget(unsigned int fd); |
| | 46 | extern unsigned long __fdget_raw(unsigned int fd); |
| | 47 | extern unsigned long __fdget_pos(unsigned int fd); |
| | 48 | extern void __f_unlock_pos(struct file *); |
| | 49 | |
| | 50 | static inline struct fd __to_fd(unsigned long v) |
| | 51 | { |
| | 52 | return (struct fd){(struct file *)(v & ~3),v & 3}; |
| | 53 | } |
| | 54 | |
| | 55 | static inline struct fd fdget(unsigned int fd) |
| | 56 | { |
| | 57 | return __to_fd(__fdget(fd)); |
| | 58 | } |
| | 59 | |
| | 60 | static inline struct fd fdget_raw(unsigned int fd) |
| | 61 | { |
| | 62 | return __to_fd(__fdget_raw(fd)); |
| | 63 | } |
| | 64 | |
| | 65 | static inline struct fd fdget_pos(int fd) |
| | 66 | { |
| | 67 | return __to_fd(__fdget_pos(fd)); |
| | 68 | } |
| | 69 | |
| | 70 | static inline void fdput_pos(struct fd f) |
| | 71 | { |
| | 72 | if (f.flags & FDPUT_POS_UNLOCK) |
| | 73 | __f_unlock_pos(f.file); |
| | 74 | fdput(f); |
| | 75 | } |
| | 76 | |
| | 77 | extern int f_dupfd(unsigned int from, struct file *file, unsigned flags); |
| | 78 | extern int replace_fd(unsigned fd, struct file *file, unsigned flags); |
| | 79 | extern void set_close_on_exec(unsigned int fd, int flag); |
| | 80 | extern bool get_close_on_exec(unsigned int fd); |
| | 81 | extern void put_filp(struct file *); |
| | 82 | extern int get_unused_fd_flags(unsigned flags); |
| | 83 | extern void put_unused_fd(unsigned int fd); |
| | 84 | |
| | 85 | extern void fd_install(unsigned int fd, struct file *file); |
| | 86 | |
| | 87 | extern void flush_delayed_fput(void); |
| | 88 | extern void __fput_sync(struct file *); |
| | 89 | |
| | 90 | #endif /* __LINUX_FILE_H */ |
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