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new helper: iterate_fd()

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iterates through the opened files in given descriptor table,
calling a supplied function; we stop once non-zero is returned.
Callback gets struct file *, descriptor number and const void *
argument passed to iterator.  It is called with files->file_lock
held, so it is not allowed to block.

tty_io, netprio_cgroup and selinux flush_unauthorized_files()
converted to its use.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2012-08-21 22:32:06 -04:00
parent ad47bd7252
commit c3c073f808
5 changed files with 71 additions and 84 deletions
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21
fs/file.c
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@ -979,3 +979,24 @@ int f_dupfd(unsigned int from, struct file *file, unsigned flags)
}
return err;
}
int iterate_fd(struct files_struct *files, unsigned n,
int (*f)(const void *, struct file *, unsigned),
const void *p)
{
struct fdtable *fdt;
struct file *file;
int res = 0;
if (!files)
return 0;
spin_lock(&files->file_lock);
fdt = files_fdtable(files);
while (!res && n < fdt->max_fds) {
file = rcu_dereference_check_fdtable(files, fdt->fd[n++]);
if (file)
res = f(p, file, n);
}
spin_unlock(&files->file_lock);
return res;
}
EXPORT_SYMBOL(iterate_fd);