On Tue, 2013-10-01 at 23:04 +0100, Al Viro wrote:
> On Tue, Oct 01, 2013 at 02:41:58PM -0700, Eric Dumazet wrote:
> > Maybe I am missing something obvious ?
>
> Yes. do_execve_common() starts with unshare_files(); there can be
> no other thread capable of modifying that descriptor table.
Hmm, then what's the point of using spin_lock() here ?
This gives wrong hints ;)
diff --git a/fs/file.c b/fs/file.c
index 4a78f98..cdbca0d 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -615,11 +615,10 @@ void do_close_on_exec(struct files_struct *files)
struct fdtable *fdt;
/* exec unshares first */
- spin_lock(&files->file_lock);
+ fdt = files_fdtable(files);
for (i = 0; ; i++) {
unsigned long set;
unsigned fd = i * BITS_PER_LONG;
- fdt = files_fdtable(files);
if (fd >= fdt->max_fds)
break;
set = fdt->close_on_exec[i];
@@ -635,14 +634,11 @@ void do_close_on_exec(struct files_struct *files)
continue;
rcu_assign_pointer(fdt->fd[fd], NULL);
__put_unused_fd(files, fd);
- spin_unlock(&files->file_lock);
filp_close(file, files);
cond_resched();
- spin_lock(&files->file_lock);
}
}
- spin_unlock(&files->file_lock);
}
struct file *fget(unsigned int fd)
--
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