#include "internal.h"
-static ssize_t proc_file_read(struct file *file, char __user *buf,
- size_t nbytes, loff_t *ppos);
-static ssize_t proc_file_write(struct file *file, const char __user *buffer,
- size_t count, loff_t *ppos);
-static loff_t proc_file_lseek(struct file *, loff_t, int);
-
DEFINE_SPINLOCK(proc_subdir_lock);
static int proc_match(int len, const char *name, struct proc_dir_entry *de)
return !memcmp(name, de->name, len);
}
-static const struct file_operations proc_file_operations = {
- .llseek = proc_file_lseek,
- .read = proc_file_read,
- .write = proc_file_write,
-};
-
/* buffer size is one page but our output routines use some slack for overruns */
#define PROC_BLOCK_SIZE (PAGE_SIZE - 1024)
return retval;
}
+static const struct file_operations proc_file_operations = {
+ .llseek = proc_file_lseek,
+ .read = proc_file_read,
+ .write = proc_file_write,
+};
+
static int proc_notify_change(struct dentry *dentry, struct iattr *iattr)
{
struct inode *inode = dentry->d_inode;
if (de->namelen != dentry->d_name.len)
continue;
if (!memcmp(dentry->d_name.name, de->name, de->namelen)) {
- unsigned int ino = de->low_ino;
+ unsigned int ino;
+ if (de->shadow_proc)
+ de = de->shadow_proc(current, de);
+ ino = de->low_ino;
de_get(de);
spin_unlock(&proc_subdir_lock);
error = -EINVAL;
inode = proc_get_inode(dir->i_sb, ino, de);
- spin_lock(&proc_subdir_lock);
- break;
+ goto out_unlock;
}
}
}
spin_unlock(&proc_subdir_lock);
+out_unlock:
unlock_kernel();
if (inode) {
static int proc_register(struct proc_dir_entry * dir, struct proc_dir_entry * dp)
{
unsigned int i;
+ struct proc_dir_entry *tmp;
i = get_inode_number();
if (i == 0)
}
spin_lock(&proc_subdir_lock);
+
+ for (tmp = dir->subdir; tmp; tmp = tmp->next)
+ if (strcmp(tmp->name, dp->name) == 0) {
+ printk(KERN_WARNING "proc_dir_entry '%s' already "
+ "registered\n", dp->name);
+ dump_stack();
+ break;
+ }
+
dp->next = dir->subdir;
dp->parent = dir;
dir->subdir = dp;
return 0;
}
-/*
- * Kill an inode that got unregistered..
- */
-static void proc_kill_inodes(struct proc_dir_entry *de)
-{
- struct list_head *p;
- struct super_block *sb;
-
- /*
- * Actually it's a partial revoke().
- */
- spin_lock(&sb_lock);
- list_for_each_entry(sb, &proc_fs_type.fs_supers, s_instances) {
- file_list_lock();
- list_for_each(p, &sb->s_files) {
- struct file *filp = list_entry(p, struct file,
- f_u.fu_list);
- struct dentry *dentry = filp->f_path.dentry;
- struct inode *inode;
- const struct file_operations *fops;
-
- if (dentry->d_op != &proc_dentry_operations)
- continue;
- inode = dentry->d_inode;
- if (PDE(inode) != de)
- continue;
- fops = filp->f_op;
- filp->f_op = NULL;
- fops_put(fops);
- }
- file_list_unlock();
- }
- spin_unlock(&sb_lock);
-}
-
-static struct proc_dir_entry *proc_create(struct proc_dir_entry **parent,
+static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent,
const char *name,
mode_t mode,
nlink_t nlink)
ent->namelen = len;
ent->mode = mode;
ent->nlink = nlink;
+ atomic_set(&ent->count, 1);
ent->pde_users = 0;
spin_lock_init(&ent->pde_unload_lock);
ent->pde_unload_completion = NULL;
{
struct proc_dir_entry *ent;
- ent = proc_create(&parent,name,
+ ent = __proc_create(&parent, name,
(S_IFLNK | S_IRUGO | S_IWUGO | S_IXUGO),1);
if (ent) {
{
struct proc_dir_entry *ent;
- ent = proc_create(&parent, name, S_IFDIR | mode, 2);
+ ent = __proc_create(&parent, name, S_IFDIR | mode, 2);
if (ent) {
if (proc_register(parent, ent) < 0) {
kfree(ent);
nlink = 1;
}
- ent = proc_create(&parent,name,mode,nlink);
+ ent = __proc_create(&parent, name, mode, nlink);
if (ent) {
if (proc_register(parent, ent) < 0) {
kfree(ent);
return ent;
}
+struct proc_dir_entry *proc_create(const char *name, mode_t mode,
+ struct proc_dir_entry *parent,
+ const struct file_operations *proc_fops)
+{
+ struct proc_dir_entry *pde;
+ nlink_t nlink;
+
+ if (S_ISDIR(mode)) {
+ if ((mode & S_IALLUGO) == 0)
+ mode |= S_IRUGO | S_IXUGO;
+ nlink = 2;
+ } else {
+ if ((mode & S_IFMT) == 0)
+ mode |= S_IFREG;
+ if ((mode & S_IALLUGO) == 0)
+ mode |= S_IRUGO;
+ nlink = 1;
+ }
+
+ pde = __proc_create(&parent, name, mode, nlink);
+ if (!pde)
+ goto out;
+ pde->proc_fops = proc_fops;
+ if (proc_register(parent, pde) < 0)
+ goto out_free;
+ return pde;
+out_free:
+ kfree(pde);
+out:
+ return NULL;
+}
+
void free_proc_entry(struct proc_dir_entry *de)
{
unsigned int ino = de->low_ino;
release_inode_number(ino);
- if (S_ISLNK(de->mode) && de->data)
+ if (S_ISLNK(de->mode))
kfree(de->data);
kfree(de);
}
/*
* Remove a /proc entry and free it if it's not currently in use.
- * If it is in use, we set the 'deleted' flag.
*/
void remove_proc_entry(const char *name, struct proc_dir_entry *parent)
{
continue_removing:
if (S_ISDIR(de->mode))
parent->nlink--;
- if (!S_ISREG(de->mode))
- proc_kill_inodes(de);
de->nlink = 0;
WARN_ON(de->subdir);
- if (!atomic_read(&de->count))
+ if (atomic_dec_and_test(&de->count))
free_proc_entry(de);
- else {
- de->deleted = 1;
- printk("remove_proc_entry: %s/%s busy, count=%d\n",
- parent->name, de->name, atomic_read(&de->count));
- }
break;
}
spin_unlock(&proc_subdir_lock);
projects / mv-sheeva.git / blobdiff