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Diffstat (limited to 'fs/proc/generic.c')
-rw-r--r--fs/proc/generic.c96
1 files changed, 62 insertions, 34 deletions
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index a3e22803cddf..26086a283672 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -112,11 +112,13 @@ static bool pde_subdir_insert(struct proc_dir_entry *dir,
/* Add new node and rebalance tree. */
rb_link_node(&de->subdir_node, parent, new);
rb_insert_color(&de->subdir_node, root);
+ if (S_ISDIR(de->mode))
+ dir->nlink++;
return true;
}
-static int proc_notify_change(struct mnt_idmap *idmap,
- struct dentry *dentry, struct iattr *iattr)
+static int proc_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
+ struct iattr *iattr)
{
struct inode *inode = d_inode(dentry);
struct proc_dir_entry *de = PDE(inode);
@@ -151,7 +153,7 @@ static int proc_getattr(struct mnt_idmap *idmap,
}
static const struct inode_operations proc_file_inode_operations = {
- .setattr = proc_notify_change,
+ .setattr = proc_setattr,
};
/*
@@ -254,8 +256,11 @@ struct dentry *proc_lookup_de(struct inode *dir, struct dentry *dentry,
inode = proc_get_inode(dir->i_sb, de);
if (!inode)
return ERR_PTR(-ENOMEM);
- d_set_d_op(dentry, de->proc_dops);
- return d_splice_alias(inode, dentry);
+ if (de->flags & PROC_ENTRY_FORCE_LOOKUP)
+ return d_splice_alias_ops(inode, dentry,
+ &proc_net_dentry_ops);
+ return d_splice_alias_ops(inode, dentry,
+ &proc_misc_dentry_ops);
}
read_unlock(&proc_subdir_lock);
return ERR_PTR(-ENOENT);
@@ -361,9 +366,28 @@ const struct dentry_operations proc_net_dentry_ops = {
static const struct inode_operations proc_dir_inode_operations = {
.lookup = proc_lookup,
.getattr = proc_getattr,
- .setattr = proc_notify_change,
+ .setattr = proc_setattr,
};
+static void pde_set_flags(struct proc_dir_entry *pde)
+{
+ const struct proc_ops *proc_ops = pde->proc_ops;
+
+ if (!proc_ops)
+ return;
+
+ if (proc_ops->proc_flags & PROC_ENTRY_PERMANENT)
+ pde->flags |= PROC_ENTRY_PERMANENT;
+ if (proc_ops->proc_read_iter)
+ pde->flags |= PROC_ENTRY_proc_read_iter;
+#ifdef CONFIG_COMPAT
+ if (proc_ops->proc_compat_ioctl)
+ pde->flags |= PROC_ENTRY_proc_compat_ioctl;
+#endif
+ if (proc_ops->proc_lseek)
+ pde->flags |= PROC_ENTRY_proc_lseek;
+}
+
/* returns the registered entry, or frees dp and returns NULL on failure */
struct proc_dir_entry *proc_register(struct proc_dir_entry *dir,
struct proc_dir_entry *dp)
@@ -371,6 +395,9 @@ struct proc_dir_entry *proc_register(struct proc_dir_entry *dir,
if (proc_alloc_inum(&dp->low_ino))
goto out_free_entry;
+ if (!S_ISDIR(dp->mode))
+ pde_set_flags(dp);
+
write_lock(&proc_subdir_lock);
dp->parent = dir;
if (pde_subdir_insert(dir, dp) == false) {
@@ -379,7 +406,6 @@ struct proc_dir_entry *proc_register(struct proc_dir_entry *dir,
write_unlock(&proc_subdir_lock);
goto out_free_inum;
}
- dir->nlink++;
write_unlock(&proc_subdir_lock);
return dp;
@@ -402,9 +428,13 @@ static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent,
if (xlate_proc_name(name, parent, &fn) != 0)
goto out;
qstr.name = fn;
- qstr.len = strlen(fn);
- if (qstr.len == 0 || qstr.len >= 256) {
- WARN(1, "name len %u\n", qstr.len);
+ qstr.len = strnlen(fn, NAME_MAX + 1);
+ if (qstr.len == 0) {
+ WARN(1, "empty name\n");
+ return NULL;
+ }
+ if (qstr.len > NAME_MAX) {
+ WARN(1, "name too long\n");
return NULL;
}
if (qstr.len == 1 && fn[0] == '.') {
@@ -448,9 +478,8 @@ static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent,
INIT_LIST_HEAD(&ent->pde_openers);
proc_set_user(ent, (*parent)->uid, (*parent)->gid);
- ent->proc_dops = &proc_misc_dentry_ops;
/* Revalidate everything under /proc/${pid}/net */
- if ((*parent)->proc_dops == &proc_net_dentry_ops)
+ if ((*parent)->flags & PROC_ENTRY_FORCE_LOOKUP)
pde_force_lookup(ent);
out:
@@ -559,18 +588,6 @@ struct proc_dir_entry *proc_create_reg(const char *name, umode_t mode,
return p;
}
-static void pde_set_flags(struct proc_dir_entry *pde)
-{
- if (pde->proc_ops->proc_flags & PROC_ENTRY_PERMANENT)
- pde->flags |= PROC_ENTRY_PERMANENT;
- if (pde->proc_ops->proc_read_iter)
- pde->flags |= PROC_ENTRY_proc_read_iter;
-#ifdef CONFIG_COMPAT
- if (pde->proc_ops->proc_compat_ioctl)
- pde->flags |= PROC_ENTRY_proc_compat_ioctl;
-#endif
-}
-
struct proc_dir_entry *proc_create_data(const char *name, umode_t mode,
struct proc_dir_entry *parent,
const struct proc_ops *proc_ops, void *data)
@@ -581,7 +598,6 @@ struct proc_dir_entry *proc_create_data(const char *name, umode_t mode,
if (!p)
return NULL;
p->proc_ops = proc_ops;
- pde_set_flags(p);
return proc_register(parent, p);
}
EXPORT_SYMBOL(proc_create_data);
@@ -632,7 +648,6 @@ struct proc_dir_entry *proc_create_seq_private(const char *name, umode_t mode,
p->proc_ops = &proc_seq_ops;
p->seq_ops = ops;
p->state_size = state_size;
- pde_set_flags(p);
return proc_register(parent, p);
}
EXPORT_SYMBOL(proc_create_seq_private);
@@ -663,7 +678,6 @@ struct proc_dir_entry *proc_create_single_data(const char *name, umode_t mode,
return NULL;
p->proc_ops = &proc_single_ops;
p->single_show = show;
- pde_set_flags(p);
return proc_register(parent, p);
}
EXPORT_SYMBOL(proc_create_single_data);
@@ -689,6 +703,14 @@ void pde_put(struct proc_dir_entry *pde)
}
}
+static void pde_erase(struct proc_dir_entry *pde, struct proc_dir_entry *parent)
+{
+ rb_erase(&pde->subdir_node, &parent->subdir);
+ RB_CLEAR_NODE(&pde->subdir_node);
+ if (S_ISDIR(pde->mode))
+ parent->nlink--;
+}
+
/*
* Remove a /proc entry and free it if it's not currently in use.
*/
@@ -711,9 +733,7 @@ void remove_proc_entry(const char *name, struct proc_dir_entry *parent)
WARN(1, "removing permanent /proc entry '%s'", de->name);
de = NULL;
} else {
- rb_erase(&de->subdir_node, &parent->subdir);
- if (S_ISDIR(de->mode))
- parent->nlink--;
+ pde_erase(de, parent);
}
}
write_unlock(&proc_subdir_lock);
@@ -755,7 +775,7 @@ int remove_proc_subtree(const char *name, struct proc_dir_entry *parent)
root->parent->name, root->name);
return -EINVAL;
}
- rb_erase(&root->subdir_node, &parent->subdir);
+ pde_erase(root, parent);
de = root;
while (1) {
@@ -767,13 +787,11 @@ int remove_proc_subtree(const char *name, struct proc_dir_entry *parent)
next->parent->name, next->name);
return -EINVAL;
}
- rb_erase(&next->subdir_node, &de->subdir);
+ pde_erase(next, de);
de = next;
continue;
}
next = de->parent;
- if (S_ISDIR(de->mode))
- next->nlink--;
write_unlock(&proc_subdir_lock);
proc_entry_rundown(de);
@@ -826,3 +844,13 @@ ssize_t proc_simple_write(struct file *f, const char __user *ubuf, size_t size,
kfree(buf);
return ret == 0 ? size : ret;
}
+
+/*
+ * Not exported to modules:
+ * modules' /proc files aren't permanent because modules aren't permanent.
+ */
+void impl_proc_make_permanent(struct proc_dir_entry *pde)
+{
+ if (pde)
+ pde_make_permanent(pde);
+}