* @data: something that the caller will want to get to later on
* @is_freed: Flag set if the eventfs is on its way to be freed
* @mode: the permission that the file or directory should have
+ * @uid: saved uid if changed
+ * @gid: saved gid if changed
*/
struct eventfs_file {
const char *name;
void *data;
unsigned int is_freed:1;
unsigned int mode:31;
+ kuid_t uid;
+ kgid_t gid;
};
static DEFINE_MUTEX(eventfs_mutex);
DEFINE_STATIC_SRCU(eventfs_srcu);
+/* Mode is unsigned short, use the upper bits for flags */
+enum {
+ EVENTFS_SAVE_MODE = BIT(16),
+ EVENTFS_SAVE_UID = BIT(17),
+ EVENTFS_SAVE_GID = BIT(18),
+};
+
+#define EVENTFS_MODE_MASK (EVENTFS_SAVE_MODE - 1)
+
static struct dentry *eventfs_root_lookup(struct inode *dir,
struct dentry *dentry,
unsigned int flags);
static int dcache_readdir_wrapper(struct file *file, struct dir_context *ctx);
static int eventfs_release(struct inode *inode, struct file *file);
+static void update_attr(struct eventfs_file *ef, struct iattr *iattr)
+{
+ unsigned int ia_valid = iattr->ia_valid;
+
+ if (ia_valid & ATTR_MODE) {
+ ef->mode = (ef->mode & ~EVENTFS_MODE_MASK) |
+ (iattr->ia_mode & EVENTFS_MODE_MASK) |
+ EVENTFS_SAVE_MODE;
+ }
+ if (ia_valid & ATTR_UID) {
+ ef->mode |= EVENTFS_SAVE_UID;
+ ef->uid = iattr->ia_uid;
+ }
+ if (ia_valid & ATTR_GID) {
+ ef->mode |= EVENTFS_SAVE_GID;
+ ef->gid = iattr->ia_gid;
+ }
+}
+
+static int eventfs_set_attr(struct mnt_idmap *idmap, struct dentry *dentry,
+ struct iattr *iattr)
+{
+ struct eventfs_file *ef;
+ int ret;
+
+ mutex_lock(&eventfs_mutex);
+ ef = dentry->d_fsdata;
+ /* The LSB is set when the eventfs_inode is being freed */
+ if (((unsigned long)ef & 1UL) || ef->is_freed) {
+ /* Do not allow changes if the event is about to be removed. */
+ mutex_unlock(&eventfs_mutex);
+ return -ENODEV;
+ }
+
+ ret = simple_setattr(idmap, dentry, iattr);
+ if (!ret)
+ update_attr(ef, iattr);
+ mutex_unlock(&eventfs_mutex);
+ return ret;
+}
+
static const struct inode_operations eventfs_root_dir_inode_operations = {
.lookup = eventfs_root_lookup,
+ .setattr = eventfs_set_attr,
+};
+
+static const struct inode_operations eventfs_file_inode_operations = {
+ .setattr = eventfs_set_attr,
};
static const struct file_operations eventfs_file_operations = {
.release = eventfs_release,
};
+static void update_inode_attr(struct inode *inode, struct eventfs_file *ef)
+{
+ inode->i_mode = ef->mode & EVENTFS_MODE_MASK;
+
+ if (ef->mode & EVENTFS_SAVE_UID)
+ inode->i_uid = ef->uid;
+
+ if (ef->mode & EVENTFS_SAVE_GID)
+ inode->i_gid = ef->gid;
+}
+
/**
* create_file - create a file in the tracefs filesystem
- * @name: the name of the file to create.
- * @mode: the permission that the file should have.
+ * @ef: the eventfs_file
* @parent: parent dentry for this file.
* @data: something that the caller will want to get to later on.
* @fop: struct file_operations that should be used for this file.
* If tracefs is not enabled in the kernel, the value -%ENODEV will be
* returned.
*/
-static struct dentry *create_file(const char *name, umode_t mode,
+static struct dentry *create_file(struct eventfs_file *ef,
struct dentry *parent, void *data,
const struct file_operations *fop)
{
struct dentry *dentry;
struct inode *inode;
- if (!(mode & S_IFMT))
- mode |= S_IFREG;
+ if (!(ef->mode & S_IFMT))
+ ef->mode |= S_IFREG;
- if (WARN_ON_ONCE(!S_ISREG(mode)))
+ if (WARN_ON_ONCE(!S_ISREG(ef->mode)))
return NULL;
- dentry = eventfs_start_creating(name, parent);
+ dentry = eventfs_start_creating(ef->name, parent);
if (IS_ERR(dentry))
return dentry;
if (unlikely(!inode))
return eventfs_failed_creating(dentry);
- inode->i_mode = mode;
+ /* If the user updated the directory's attributes, use them */
+ update_inode_attr(inode, ef);
+
+ inode->i_op = &eventfs_file_inode_operations;
inode->i_fop = fop;
inode->i_private = data;
/**
* create_dir - create a dir in the tracefs filesystem
- * @name: the name of the file to create.
+ * @ei: the eventfs_inode that represents the directory to create
* @parent: parent dentry for this file.
* @data: something that the caller will want to get to later on.
*
* If tracefs is not enabled in the kernel, the value -%ENODEV will be
* returned.
*/
-static struct dentry *create_dir(const char *name, struct dentry *parent, void *data)
+static struct dentry *create_dir(struct eventfs_file *ef,
+ struct dentry *parent, void *data)
{
struct tracefs_inode *ti;
struct dentry *dentry;
struct inode *inode;
- dentry = eventfs_start_creating(name, parent);
+ dentry = eventfs_start_creating(ef->name, parent);
if (IS_ERR(dentry))
return dentry;
if (unlikely(!inode))
return eventfs_failed_creating(dentry);
- inode->i_mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO;
+ update_inode_attr(inode, ef);
+
inode->i_op = &eventfs_root_dir_inode_operations;
inode->i_fop = &eventfs_file_operations;
inode->i_private = data;
inode_lock(parent->d_inode);
if (ef->ei)
- dentry = create_dir(ef->name, parent, ef->data);
+ dentry = create_dir(ef, parent, ef->data);
else
- dentry = create_file(ef->name, ef->mode, parent,
- ef->data, ef->fop);
+ dentry = create_file(ef, parent, ef->data, ef->fop);
if (!lookup)
inode_unlock(parent->d_inode);
if (d) {
struct dentry **tmp;
+
tmp = krealloc(dentries, sizeof(d) * (cnt + 2), GFP_KERNEL);
if (!tmp)
break;
return ERR_PTR(-ENOMEM);
}
INIT_LIST_HEAD(&ef->ei->e_top_files);
+ ef->mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO;
} else {
ef->ei = NULL;
+ ef->mode = mode;
}
ef->iop = iop;
ef->fop = fop;
- ef->mode = mode;
ef->data = data;
return ef;
}
projects / platform / kernel / linux-starfive.git / blobdiff