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authorAl Viro <viro@zeniv.linux.org.uk>2012-08-21 22:32:06 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-09-26 21:09:59 -0400
commitc3c073f808b22dfae15ef8412b6f7b998644139a (patch)
tree3369bcbe414738d90e6ccfe257f6ce3e72f6a5ae /fs/file.c
parentad47bd7252bf402fe7dba92f5240b5ed16832ae7 (diff)
new helper: iterate_fd()
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>
Diffstat (limited to 'fs/file.c')
-rw-r--r--fs/file.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/fs/file.c b/fs/file.c
index 967bd0dadbe5..e6e418122587 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -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);