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exofs: Add SYSFS info for autologin/pNFS export
Introduce sysfs infrastructure for exofs cluster filesystem. Each OSD target shows up as below in the sysfs hierarchy: /sys/fs/exofs/<osdname>_<partition_id>/devX Where <osdname>_<partition_id> is the unique identification of a Superblock. Where devX: 0 <= X < device_table_size. They are ordered in device-table order as specified to the mkfs.exofs command Each OSD device devX has following attributes : osdname - ReadOnly systemid - ReadOnly uri - Read/Write It is up to user-mode to update devX/uri for support of autologin. These sysfs information are used both for autologin as well as support for exporting exofs via a pNFSD server in user-mode. (.eg NFS-Ganesha) Signed-off-by: Sachin Bhamare <[email protected]> Signed-off-by: Boaz Harrosh <[email protected]>
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Sachin Bhamare
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Boaz Harrosh
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May 21, 2012
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,200 @@ | ||
| /* | ||
| * Copyright (C) 2012 | ||
| * Sachin Bhamare <[email protected]> | ||
| * Boaz Harrosh <[email protected]> | ||
| * | ||
| * 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 <[email protected]> | ||
| */ | ||
|
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| #include <linux/kobject.h> | ||
| #include <linux/device.h> | ||
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| #include "exofs.h" | ||
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| struct odev_attr { | ||
| struct attribute attr; | ||
| ssize_t (*show)(struct exofs_dev *, char *); | ||
| ssize_t (*store)(struct exofs_dev *, const char *, size_t); | ||
| }; | ||
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| 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); | ||
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| return a->show ? a->show(edp, buf) : 0; | ||
| } | ||
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| 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); | ||
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| return a->store ? a->store(edp, buf, len) : len; | ||
| } | ||
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| static const struct sysfs_ops odev_attr_ops = { | ||
| .show = odev_attr_show, | ||
| .store = odev_attr_store, | ||
| }; | ||
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|
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| static struct kset *exofs_kset; | ||
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| 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); | ||
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| return snprintf(buf, odi->osdname_len + 1, "%s", odi->osdname); | ||
| } | ||
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| 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); | ||
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| memcpy(buf, odi->systemid, odi->systemid_len); | ||
| return odi->systemid_len; | ||
| } | ||
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| static ssize_t uri_show(struct exofs_dev *edp, char *buf) | ||
| { | ||
| return snprintf(buf, edp->urilen, "%s", edp->uri); | ||
| } | ||
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| 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; | ||
| } | ||
|
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| #define OSD_ATTR(name, mode, show, store) \ | ||
| static struct odev_attr odev_attr_##name = \ | ||
| __ATTR(name, mode, show, store) | ||
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| 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); | ||
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| static struct attribute *odev_attrs[] = { | ||
| &odev_attr_osdname.attr, | ||
| &odev_attr_systemid.attr, | ||
| &odev_attr_uri.attr, | ||
| NULL, | ||
| }; | ||
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| static struct kobj_type odev_ktype = { | ||
| .default_attrs = odev_attrs, | ||
| .sysfs_ops = &odev_attr_ops, | ||
| }; | ||
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| static struct kobj_type uuid_ktype = { | ||
| }; | ||
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| void exofs_sysfs_dbg_print() | ||
| { | ||
| #ifdef CONFIG_EXOFS_DEBUG | ||
| struct kobject *k_name, *k_tmp; | ||
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| 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; | ||
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| 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); | ||
| } | ||
|
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| /* | ||
| * 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; | ||
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| /* 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; | ||
| } | ||
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| int exofs_sysfs_odev_add(struct exofs_dev *edev, struct exofs_sb_info *sbi) | ||
| { | ||
| struct kobject *d_kobj; | ||
| int retval = 0; | ||
|
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| /* 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; | ||
| } | ||
|
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| 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; | ||
| } | ||
|
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| void exofs_sysfs_uninit(void) | ||
| { | ||
| kset_unregister(exofs_kset); | ||
| } |