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give readdir(2)/getdents(2)/etc. uniform exclusion with lseek()

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same as read() on regular files has, and for the same reason.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2016-04-20 17:08:21 -04:00
parent 9902af79c0
commit 63b6df1413
7 changed files with 33 additions and 27 deletions
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13
include/linux/file.h
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@@ -44,6 +44,7 @@ extern struct file *fget_raw(unsigned int fd);
extern unsigned long __fdget(unsigned int fd);
extern unsigned long __fdget_raw(unsigned int fd);
extern unsigned long __fdget_pos(unsigned int fd);
extern void __f_unlock_pos(struct file *);
static inline struct fd __to_fd(unsigned long v)
{
@@ -60,6 +61,18 @@ static inline struct fd fdget_raw(unsigned int fd)
return __to_fd(__fdget_raw(fd));
}
static inline struct fd fdget_pos(int fd)
{
return __to_fd(__fdget_pos(fd));
}
static inline void fdput_pos(struct fd f)
{
if (f.flags & FDPUT_POS_UNLOCK)
__f_unlock_pos(f.file);
fdput(f);
}
extern int f_dupfd(unsigned int from, struct file *file, unsigned flags);
extern int replace_fd(unsigned fd, struct file *file, unsigned flags);
extern void set_close_on_exec(unsigned int fd, int flag);