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author | Al Viro <viro@zeniv.linux.org.uk> | 2012-08-22 04:32:06 +0200 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-09-27 03:09:59 +0200 |
commit | c3c073f808b22dfae15ef8412b6f7b998644139a (patch) | |
tree | 3369bcbe414738d90e6ccfe257f6ce3e72f6a5ae /fs | |
parent | make expand_files() and alloc_fd() static (diff) | |
download | linux-c3c073f808b22dfae15ef8412b6f7b998644139a.tar.xz linux-c3c073f808b22dfae15ef8412b6f7b998644139a.zip |
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')
-rw-r--r-- | fs/file.c | 21 |
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); |