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-rw-r--r--fs/exofs/sys.c200
1 files changed, 200 insertions, 0 deletions
diff --git a/fs/exofs/sys.c b/fs/exofs/sys.c
new file mode 100644
index 00000000000..5a7b691e748
--- /dev/null
+++ b/fs/exofs/sys.c
@@ -0,0 +1,200 @@
+/*
+ * Copyright (C) 2012
+ * Sachin Bhamare <sbhamare@panasas.com>
+ * Boaz Harrosh <bharrosh@panasas.com>
+ *
+ * This file is part of exofs.
+ *
+ * exofs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License 2 as published by
+ * the Free Software Foundation.
+ *
+ * exofs is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with exofs; if not, write to the:
+ * Free Software Foundation <licensing@fsf.org>
+ */
+
+#include <linux/kobject.h>
+#include <linux/device.h>
+
+#include "exofs.h"
+
+struct odev_attr {
+ struct attribute attr;
+ ssize_t (*show)(struct exofs_dev *, char *);
+ ssize_t (*store)(struct exofs_dev *, const char *, size_t);
+};
+
+static ssize_t odev_attr_show(struct kobject *kobj, struct attribute *attr,
+ char *buf)
+{
+ struct exofs_dev *edp = container_of(kobj, struct exofs_dev, ed_kobj);
+ struct odev_attr *a = container_of(attr, struct odev_attr, attr);
+
+ return a->show ? a->show(edp, buf) : 0;
+}
+
+static ssize_t odev_attr_store(struct kobject *kobj, struct attribute *attr,
+ const char *buf, size_t len)
+{
+ struct exofs_dev *edp = container_of(kobj, struct exofs_dev, ed_kobj);
+ struct odev_attr *a = container_of(attr, struct odev_attr, attr);
+
+ return a->store ? a->store(edp, buf, len) : len;
+}
+
+static const struct sysfs_ops odev_attr_ops = {
+ .show = odev_attr_show,
+ .store = odev_attr_store,
+};
+
+
+static struct kset *exofs_kset;
+
+static ssize_t osdname_show(struct exofs_dev *edp, char *buf)
+{
+ struct osd_dev *odev = edp->ored.od;
+ const struct osd_dev_info *odi = osduld_device_info(odev);
+
+ return snprintf(buf, odi->osdname_len + 1, "%s", odi->osdname);
+}
+
+static ssize_t systemid_show(struct exofs_dev *edp, char *buf)
+{
+ struct osd_dev *odev = edp->ored.od;
+ const struct osd_dev_info *odi = osduld_device_info(odev);
+
+ memcpy(buf, odi->systemid, odi->systemid_len);
+ return odi->systemid_len;
+}
+
+static ssize_t uri_show(struct exofs_dev *edp, char *buf)
+{
+ return snprintf(buf, edp->urilen, "%s", edp->uri);
+}
+
+static ssize_t uri_store(struct exofs_dev *edp, const char *buf, size_t len)
+{
+ edp->urilen = strlen(buf) + 1;
+ edp->uri = krealloc(edp->uri, edp->urilen, GFP_KERNEL);
+ strncpy(edp->uri, buf, edp->urilen);
+ return edp->urilen;
+}
+
+#define OSD_ATTR(name, mode, show, store) \
+ static struct odev_attr odev_attr_##name = \
+ __ATTR(name, mode, show, store)
+
+OSD_ATTR(osdname, S_IRUGO, osdname_show, NULL);
+OSD_ATTR(systemid, S_IRUGO, systemid_show, NULL);
+OSD_ATTR(uri, S_IRWXU, uri_show, uri_store);
+
+static struct attribute *odev_attrs[] = {
+ &odev_attr_osdname.attr,
+ &odev_attr_systemid.attr,
+ &odev_attr_uri.attr,
+ NULL,
+};
+
+static struct kobj_type odev_ktype = {
+ .default_attrs = odev_attrs,
+ .sysfs_ops = &odev_attr_ops,
+};
+
+static struct kobj_type uuid_ktype = {
+};
+
+void exofs_sysfs_dbg_print(void)
+{
+#ifdef CONFIG_EXOFS_DEBUG
+ struct kobject *k_name, *k_tmp;
+
+ list_for_each_entry_safe(k_name, k_tmp, &exofs_kset->list, entry) {
+ printk(KERN_INFO "%s: name %s ref %d\n",
+ __func__, kobject_name(k_name),
+ (int)atomic_read(&k_name->kref.refcount));
+ }
+#endif
+}
+/*
+ * This function removes all kobjects under exofs_kset
+ * At the end of it, exofs_kset kobject will have a refcount
+ * of 1 which gets decremented only on exofs module unload
+ */
+void exofs_sysfs_sb_del(struct exofs_sb_info *sbi)
+{
+ struct kobject *k_name, *k_tmp;
+ struct kobject *s_kobj = &sbi->s_kobj;
+
+ list_for_each_entry_safe(k_name, k_tmp, &exofs_kset->list, entry) {
+ /* Remove all that are children of this SBI */
+ if (k_name->parent == s_kobj)
+ kobject_put(k_name);
+ }
+ kobject_put(s_kobj);
+}
+
+/*
+ * This function creates sysfs entries to hold the current exofs cluster
+ * instance (uniquely identified by osdname,pid tuple).
+ * This function gets called once per exofs mount instance.
+ */
+int exofs_sysfs_sb_add(struct exofs_sb_info *sbi,
+ struct exofs_dt_device_info *dt_dev)
+{
+ struct kobject *s_kobj;
+ int retval = 0;
+ uint64_t pid = sbi->one_comp.obj.partition;
+
+ /* allocate new uuid dirent */
+ s_kobj = &sbi->s_kobj;
+ s_kobj->kset = exofs_kset;
+ retval = kobject_init_and_add(s_kobj, &uuid_ktype,
+ &exofs_kset->kobj, "%s_%llx", dt_dev->osdname, pid);
+ if (retval) {
+ EXOFS_ERR("ERROR: Failed to create sysfs entry for "
+ "uuid-%s_%llx => %d\n", dt_dev->osdname, pid, retval);
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+int exofs_sysfs_odev_add(struct exofs_dev *edev, struct exofs_sb_info *sbi)
+{
+ struct kobject *d_kobj;
+ int retval = 0;
+
+ /* create osd device group which contains following attributes
+ * osdname, systemid & uri
+ */
+ d_kobj = &edev->ed_kobj;
+ d_kobj->kset = exofs_kset;
+ retval = kobject_init_and_add(d_kobj, &odev_ktype,
+ &sbi->s_kobj, "dev%u", edev->did);
+ if (retval) {
+ EXOFS_ERR("ERROR: Failed to create sysfs entry for "
+ "device dev%u\n", edev->did);
+ return retval;
+ }
+ return 0;
+}
+
+int exofs_sysfs_init(void)
+{
+ exofs_kset = kset_create_and_add("exofs", NULL, fs_kobj);
+ if (!exofs_kset) {
+ EXOFS_ERR("ERROR: kset_create_and_add exofs failed\n");
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+void exofs_sysfs_uninit(void)
+{
+ kset_unregister(exofs_kset);
+}