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authorAlexey Dobriyan <adobriyan@gmail.com>2009-03-25 22:48:06 +0300
committerAlexey Dobriyan <adobriyan@gmail.com>2009-03-31 01:14:44 +0400
commit99b76233803beab302123d243eea9e41149804f3 (patch)
tree398178210fe66845ccd6fa4258ba762a87e023ad /fs/reiserfs
parent3dec7f59c370c7b58184d63293c3dc984d475840 (diff)
downloadop-kernel-dev-99b76233803beab302123d243eea9e41149804f3.zip
op-kernel-dev-99b76233803beab302123d243eea9e41149804f3.tar.gz
proc 2/2: remove struct proc_dir_entry::owner
Setting ->owner as done currently (pde->owner = THIS_MODULE) is racy as correctly noted at bug #12454. Someone can lookup entry with NULL ->owner, thus not pinning enything, and release it later resulting in module refcount underflow. We can keep ->owner and supply it at registration time like ->proc_fops and ->data. But this leaves ->owner as easy-manipulative field (just one C assignment) and somebody will forget to unpin previous/pin current module when switching ->owner. ->proc_fops is declared as "const" which should give some thoughts. ->read_proc/->write_proc were just fixed to not require ->owner for protection. rmmod'ed directories will be empty and return "." and ".." -- no harm. And directories with tricky enough readdir and lookup shouldn't be modular. We definitely don't want such modular code. Removing ->owner will also make PDE smaller. So, let's nuke it. Kudos to Jeff Layton for reminding about this, let's say, oversight. http://bugzilla.kernel.org/show_bug.cgi?id=12454 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Diffstat (limited to 'fs/reiserfs')
-rw-r--r--fs/reiserfs/procfs.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/fs/reiserfs/procfs.c b/fs/reiserfs/procfs.c
index d506640..9229e55 100644
--- a/fs/reiserfs/procfs.c
+++ b/fs/reiserfs/procfs.c
@@ -492,7 +492,6 @@ int reiserfs_proc_info_init(struct super_block *sb)
spin_lock_init(&__PINFO(sb).lock);
REISERFS_SB(sb)->procdir = proc_mkdir(b, proc_info_root);
if (REISERFS_SB(sb)->procdir) {
- REISERFS_SB(sb)->procdir->owner = THIS_MODULE;
REISERFS_SB(sb)->procdir->data = sb;
add_file(sb, "version", show_version);
add_file(sb, "super", show_super);
@@ -556,9 +555,7 @@ int reiserfs_proc_info_global_init(void)
{
if (proc_info_root == NULL) {
proc_info_root = proc_mkdir(proc_info_root_name, NULL);
- if (proc_info_root) {
- proc_info_root->owner = THIS_MODULE;
- } else {
+ if (!proc_info_root) {
reiserfs_warning(NULL, "cannot create /proc/%s",
proc_info_root_name);
return 1;
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