diff options
Diffstat (limited to 'kernel/fs/exofs/sys.c')
| -rw-r--r-- | kernel/fs/exofs/sys.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/kernel/fs/exofs/sys.c b/kernel/fs/exofs/sys.c new file mode 100644 index 000000000..5e6a2c0a1 --- /dev/null +++ b/kernel/fs/exofs/sys.c @@ -0,0 +1,205 @@ +/* + * Copyright (C) 2012 + * Sachin Bhamare <sbhamare@panasas.com> + * Boaz Harrosh <ooo@electrozaur.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) +{ + uint8_t *new_uri; + + edp->urilen = strlen(buf) + 1; + new_uri = krealloc(edp->uri, edp->urilen, GFP_KERNEL); + if (new_uri == NULL) + return -ENOMEM; + edp->uri = new_uri; + 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); +} |