static void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode) { struct bin_attribute *bin_attr; struct sysfs_inode_attrs *iattrs; inode->i_private = sysfs_get(sd); inode->i_mapping->a_ops = &sysfs_aops; inode->i_mapping->backing_dev_info = &sysfs_backing_dev_info; inode->i_op = &sysfs_inode_operations; inode->i_ino = sd->s_ino; lockdep_set_class(&inode->i_mutex, &sysfs_inode_imutex_key); iattrs = sd->s_iattr; if (iattrs) { /* sysfs_dirent has non-default attributes * get them for the new inode from persistent copy * in sysfs_dirent */ set_inode_attr(inode, &iattrs->ia_iattr); if (iattrs->ia_secdata) security_inode_notifysecctx(inode, iattrs->ia_secdata, iattrs->ia_secdata_len); } else set_default_inode_attr(inode, sd->s_mode); /* initialize inode according to type */ switch (sysfs_type(sd)) { case SYSFS_DIR: inode->i_op = &sysfs_dir_inode_operations; inode->i_fop = &sysfs_dir_operations; inode->i_nlink = sysfs_count_nlink(sd); break; case SYSFS_KOBJ_ATTR: inode->i_size = PAGE_SIZE; inode->i_fop = &sysfs_file_operations; break; case SYSFS_KOBJ_BIN_ATTR: bin_attr = sd->s_bin_attr.bin_attr; inode->i_size = bin_attr->size; inode->i_fop = &bin_fops; break; case SYSFS_KOBJ_LINK: inode->i_op = &sysfs_symlink_inode_operations; break; default: BUG(); } unlock_new_inode(inode); }
static void sysfs_refresh_inode(struct sysfs_dirent *sd, struct inode *inode) { struct sysfs_inode_attrs *iattrs = sd->s_iattr; inode->i_mode = sd->s_mode; if (iattrs) { /* sysfs_dirent has non-default attributes * get them from persistent copy in sysfs_dirent */ set_inode_attr(inode, &iattrs->ia_iattr); security_inode_notifysecctx(inode, iattrs->ia_secdata, iattrs->ia_secdata_len); } if (sysfs_type(sd) == SYSFS_DIR) inode->i_nlink = sysfs_count_nlink(sd); }
static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) { struct dentry *ret = NULL; struct sysfs_dirent * parent_sd = dentry->d_parent->d_fsdata; struct sysfs_dirent * sd; struct bin_attribute *bin_attr; struct inode *inode; int found = 0; mutex_lock(&sysfs_mutex); for (sd = parent_sd->s_children; sd; sd = sd->s_sibling) { if (sysfs_type(sd) && !strcmp(sd->s_name, dentry->d_name.name)) { found = 1; break; } } /* no such entry */ if (!found) goto out_unlock; /* attach dentry and inode */ inode = sysfs_get_inode(sd); if (!inode) { ret = ERR_PTR(-ENOMEM); goto out_unlock; } if (inode->i_state & I_NEW) { /* initialize inode according to type */ switch (sysfs_type(sd)) { case SYSFS_DIR: inode->i_op = &sysfs_dir_inode_operations; inode->i_fop = &sysfs_dir_operations; inode->i_nlink = sysfs_count_nlink(sd); break; case SYSFS_KOBJ_ATTR: inode->i_size = PAGE_SIZE; inode->i_fop = &sysfs_file_operations; break; case SYSFS_KOBJ_BIN_ATTR: bin_attr = sd->s_elem.bin_attr.bin_attr; inode->i_size = bin_attr->size; inode->i_fop = &bin_fops; break; case SYSFS_KOBJ_LINK: inode->i_op = &sysfs_symlink_inode_operations; break; default: BUG(); } } sysfs_instantiate(dentry, inode); sysfs_attach_dentry(sd, dentry); out_unlock: mutex_unlock(&sysfs_mutex); return ret; }