#include <linux/namei.h>
#include <linux/bitops.h>
#include <linux/spinlock.h>
+#include <linux/completion.h>
#include <asm/uaccess.h>
#include "internal.h"
DEFINE_SPINLOCK(proc_subdir_lock);
-int proc_match(int len, const char *name, struct proc_dir_entry *de)
+static int proc_match(int len, const char *name, struct proc_dir_entry *de)
{
if (de->namelen != len)
return 0;
return !memcmp(name, de->name, len);
}
-static struct file_operations proc_file_operations = {
+static const struct file_operations proc_file_operations = {
.llseek = proc_file_lseek,
.read = proc_file_read,
.write = proc_file_write,
return 0;
}
-static struct inode_operations proc_file_inode_operations = {
+static const struct inode_operations proc_file_inode_operations = {
.setattr = proc_notify_change,
};
return NULL;
}
-static struct inode_operations proc_link_inode_operations = {
+static const struct inode_operations proc_link_inode_operations = {
.readlink = generic_readlink,
.follow_link = proc_follow_link,
};
if (!memcmp(dentry->d_name.name, de->name, de->namelen)) {
unsigned int ino = de->low_ino;
+ de_get(de);
spin_unlock(&proc_subdir_lock);
error = -EINVAL;
inode = proc_get_inode(dir->i_sb, ino, de);
d_add(dentry, inode);
return NULL;
}
+ de_put(de);
return ERR_PTR(error);
}
}
do {
+ struct proc_dir_entry *next;
+
/* filldir passes info to user space */
+ de_get(de);
spin_unlock(&proc_subdir_lock);
if (filldir(dirent, de->name, de->namelen, filp->f_pos,
- de->low_ino, de->mode >> 12) < 0)
+ de->low_ino, de->mode >> 12) < 0) {
+ de_put(de);
goto out;
+ }
spin_lock(&proc_subdir_lock);
filp->f_pos++;
- de = de->next;
+ next = de->next;
+ de_put(de);
+ de = next;
} while (de);
spin_unlock(&proc_subdir_lock);
}
* use the in-memory "struct proc_dir_entry" tree to parse
* the /proc directory.
*/
-static struct file_operations proc_dir_operations = {
+static const struct file_operations proc_dir_operations = {
.read = generic_read_dir,
.readdir = proc_readdir,
};
/*
* proc directories can do almost nothing..
*/
-static struct inode_operations proc_dir_inode_operations = {
+static const struct inode_operations proc_dir_inode_operations = {
.lookup = proc_lookup,
.getattr = proc_getattr,
.setattr = proc_notify_change,
return -EAGAIN;
dp->low_ino = i;
- spin_lock(&proc_subdir_lock);
- dp->next = dir->subdir;
- dp->parent = dir;
- dir->subdir = dp;
- spin_unlock(&proc_subdir_lock);
-
if (S_ISDIR(dp->mode)) {
if (dp->proc_iops == NULL) {
dp->proc_fops = &proc_dir_operations;
if (dp->proc_iops == NULL)
dp->proc_iops = &proc_file_inode_operations;
}
+
+ spin_lock(&proc_subdir_lock);
+ dp->next = dir->subdir;
+ dp->parent = dir;
+ dir->subdir = dp;
+ spin_unlock(&proc_subdir_lock);
+
return 0;
}
ent->namelen = len;
ent->mode = mode;
ent->nlink = nlink;
+ ent->pde_users = 0;
+ spin_lock_init(&ent->pde_unload_lock);
+ ent->pde_unload_completion = NULL;
out:
return ent;
}
ent = proc_create(&parent, name, S_IFDIR | mode, 2);
if (ent) {
- ent->proc_fops = &proc_dir_operations;
- ent->proc_iops = &proc_dir_inode_operations;
-
if (proc_register(parent, ent) < 0) {
kfree(ent);
ent = NULL;
ent = proc_create(&parent,name,mode,nlink);
if (ent) {
- if (S_ISDIR(mode)) {
- ent->proc_fops = &proc_dir_operations;
- ent->proc_iops = &proc_dir_inode_operations;
- }
if (proc_register(parent, ent) < 0) {
kfree(ent);
ent = NULL;
de = *p;
*p = de->next;
de->next = NULL;
+
+ spin_lock(&de->pde_unload_lock);
+ /*
+ * Stop accepting new callers into module. If you're
+ * dynamically allocating ->proc_fops, save a pointer somewhere.
+ */
+ de->proc_fops = NULL;
+ /* Wait until all existing callers into module are done. */
+ if (de->pde_users > 0) {
+ DECLARE_COMPLETION_ONSTACK(c);
+
+ if (!de->pde_unload_completion)
+ de->pde_unload_completion = &c;
+
+ spin_unlock(&de->pde_unload_lock);
+ spin_unlock(&proc_subdir_lock);
+
+ wait_for_completion(de->pde_unload_completion);
+
+ spin_lock(&proc_subdir_lock);
+ goto continue_removing;
+ }
+ spin_unlock(&de->pde_unload_lock);
+
+continue_removing:
if (S_ISDIR(de->mode))
parent->nlink--;
- proc_kill_inodes(de);
+ if (!S_ISREG(de->mode))
+ proc_kill_inodes(de);
de->nlink = 0;
WARN_ON(de->subdir);
if (!atomic_read(&de->count))