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2c935bc572
Since we need to change the implementation, stop exposing internals. Provide kref_read() to read the current reference count; typically used for debug messages. Kills two anti-patterns: atomic_read(&kref->refcount) kref->refcount.counter Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
206 lines
5.3 KiB
C
206 lines
5.3 KiB
C
/*
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* Copyright (C) 2012
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* Sachin Bhamare <sbhamare@panasas.com>
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* Boaz Harrosh <ooo@electrozaur.com>
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*
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* This file is part of exofs.
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*
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* exofs is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License 2 as published by
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* the Free Software Foundation.
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*
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* exofs is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with exofs; if not, write to the:
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* Free Software Foundation <licensing@fsf.org>
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*/
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#include <linux/kobject.h>
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#include <linux/device.h>
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#include "exofs.h"
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struct odev_attr {
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struct attribute attr;
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ssize_t (*show)(struct exofs_dev *, char *);
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ssize_t (*store)(struct exofs_dev *, const char *, size_t);
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};
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static ssize_t odev_attr_show(struct kobject *kobj, struct attribute *attr,
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char *buf)
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{
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struct exofs_dev *edp = container_of(kobj, struct exofs_dev, ed_kobj);
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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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}
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static ssize_t odev_attr_store(struct kobject *kobj, struct attribute *attr,
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const char *buf, size_t len)
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{
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struct exofs_dev *edp = container_of(kobj, struct exofs_dev, ed_kobj);
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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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}
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static const struct sysfs_ops odev_attr_ops = {
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.show = odev_attr_show,
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.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)
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{
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struct osd_dev *odev = edp->ored.od;
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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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}
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static ssize_t systemid_show(struct exofs_dev *edp, char *buf)
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{
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struct osd_dev *odev = edp->ored.od;
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const struct osd_dev_info *odi = osduld_device_info(odev);
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memcpy(buf, odi->systemid, odi->systemid_len);
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return odi->systemid_len;
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}
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static ssize_t uri_show(struct exofs_dev *edp, char *buf)
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{
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return snprintf(buf, edp->urilen, "%s", edp->uri);
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}
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static ssize_t uri_store(struct exofs_dev *edp, const char *buf, size_t len)
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{
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uint8_t *new_uri;
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edp->urilen = strlen(buf) + 1;
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new_uri = krealloc(edp->uri, edp->urilen, GFP_KERNEL);
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if (new_uri == NULL)
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return -ENOMEM;
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edp->uri = new_uri;
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strncpy(edp->uri, buf, edp->urilen);
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return edp->urilen;
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}
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#define OSD_ATTR(name, mode, show, store) \
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static struct odev_attr odev_attr_##name = \
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__ATTR(name, mode, show, store)
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OSD_ATTR(osdname, S_IRUGO, osdname_show, NULL);
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OSD_ATTR(systemid, S_IRUGO, systemid_show, NULL);
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OSD_ATTR(uri, S_IRWXU, uri_show, uri_store);
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static struct attribute *odev_attrs[] = {
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&odev_attr_osdname.attr,
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&odev_attr_systemid.attr,
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&odev_attr_uri.attr,
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NULL,
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};
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static struct kobj_type odev_ktype = {
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.default_attrs = odev_attrs,
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.sysfs_ops = &odev_attr_ops,
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};
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static struct kobj_type uuid_ktype = {
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};
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void exofs_sysfs_dbg_print(void)
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{
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#ifdef CONFIG_EXOFS_DEBUG
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struct kobject *k_name, *k_tmp;
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list_for_each_entry_safe(k_name, k_tmp, &exofs_kset->list, entry) {
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printk(KERN_INFO "%s: name %s ref %d\n",
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__func__, kobject_name(k_name),
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(int)kref_read(&k_name->kref));
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}
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#endif
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}
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/*
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* This function removes all kobjects under exofs_kset
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* At the end of it, exofs_kset kobject will have a refcount
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* of 1 which gets decremented only on exofs module unload
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*/
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void exofs_sysfs_sb_del(struct exofs_sb_info *sbi)
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{
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struct kobject *k_name, *k_tmp;
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struct kobject *s_kobj = &sbi->s_kobj;
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list_for_each_entry_safe(k_name, k_tmp, &exofs_kset->list, entry) {
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/* Remove all that are children of this SBI */
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if (k_name->parent == s_kobj)
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kobject_put(k_name);
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}
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kobject_put(s_kobj);
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}
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/*
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* This function creates sysfs entries to hold the current exofs cluster
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* instance (uniquely identified by osdname,pid tuple).
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* This function gets called once per exofs mount instance.
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*/
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int exofs_sysfs_sb_add(struct exofs_sb_info *sbi,
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struct exofs_dt_device_info *dt_dev)
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{
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struct kobject *s_kobj;
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int retval = 0;
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uint64_t pid = sbi->one_comp.obj.partition;
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/* allocate new uuid dirent */
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s_kobj = &sbi->s_kobj;
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s_kobj->kset = exofs_kset;
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retval = kobject_init_and_add(s_kobj, &uuid_ktype,
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&exofs_kset->kobj, "%s_%llx", dt_dev->osdname, pid);
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if (retval) {
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EXOFS_ERR("ERROR: Failed to create sysfs entry for "
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"uuid-%s_%llx => %d\n", dt_dev->osdname, pid, retval);
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return -ENOMEM;
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}
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return 0;
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}
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int exofs_sysfs_odev_add(struct exofs_dev *edev, struct exofs_sb_info *sbi)
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{
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struct kobject *d_kobj;
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int retval = 0;
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/* create osd device group which contains following attributes
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* osdname, systemid & uri
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*/
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d_kobj = &edev->ed_kobj;
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d_kobj->kset = exofs_kset;
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retval = kobject_init_and_add(d_kobj, &odev_ktype,
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&sbi->s_kobj, "dev%u", edev->did);
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if (retval) {
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EXOFS_ERR("ERROR: Failed to create sysfs entry for "
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"device dev%u\n", edev->did);
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return retval;
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}
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return 0;
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}
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int exofs_sysfs_init(void)
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{
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exofs_kset = kset_create_and_add("exofs", NULL, fs_kobj);
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if (!exofs_kset) {
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EXOFS_ERR("ERROR: kset_create_and_add exofs failed\n");
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return -ENOMEM;
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}
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return 0;
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}
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void exofs_sysfs_uninit(void)
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{
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kset_unregister(exofs_kset);
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}
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