+++ /dev/null
-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
- * proc_lustre.c manages /proc/lustre
- *
- * Copyright (c) 2001 Rumi Zahir <rumi.zahir@intel.com>
- *
- * This file is part of Lustre, http://www.lustre.org.
- *
- * Lustre is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- *
- * Lustre 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 Lustre; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-/* OBD devices materialize in /proc as a directory:
- * /proc/lustre/obd/<number>
- * when /dev/obd<number> is opened. When the device is closed, the
- * directory entry disappears.
- *
- * For each open OBD device, code in this file also creates a file
- * named <status>. "cat /proc/lustre/obd/<number>/status" gives
- * information about the OBD device's configuration.
- * The class driver manages the "status" entry.
- *
- * Other logical drivers can create their own entries. For example,
- * the obdtrace driver creates /proc/lustre/obd/<obdid>/stats entry.
- *
- * This file defines three functions
- * proc_lustre_register_obd_device() - called at device attach time
- * proc_lustre_release_obd_device() - called at detach
- * proc_lustre_remove_obd_entry()
- * that dynamically create/delete /proc/lustre/obd entries:
- *
- * proc_lustre_register_obd_device() registers an obd device,
- * and, if this is the first OBD device, creates /proc/lustre/obd.
- *
- * proc_lustre_release_obd_device() removes device information
- * from /proc/lustre/obd, and if this is the last OBD device
- * removes /proc/lustre/obd.
- *
- * proc_lustre_remove_obd_entry() removes a
- * /proc/lustre/obd/<obdid>/ entry by name. This is the only
- * function that is exported to other modules.
- */
-
-#define EXPORT_SYMTAB
-#include <linux/config.h>
-#include <linux/module.h>
-#include <linux/version.h>
-#include <linux/proc_fs.h>
-
-#define DEBUG_SUBSYSTEM S_CLASS
-
-#include <linux/obd_support.h>
-#include <linux/obd_class.h>
-
-#ifdef CONFIG_PROC_FS
-extern struct proc_dir_entry proc_root;
-static struct proc_dir_entry *proc_lustre_dir_entry = NULL;
-static struct proc_dir_entry *proc_lustre_obd_dir_entry = NULL;
-
-static int read_lustre_status(char *page, char **start, off_t offset,
- int count, int *eof, void *data)
-{
- struct obd_device * obddev = (struct obd_device *)data;
- int p;
-
-#warning FIXME: This function is madness, completely unsafe, a disaster waiting to happen.
-
- p = sprintf(&page[0], "device=%d\n", obddev->obd_minor);
- p += sprintf(&page[p], "name=%s\n", MKSTR(obddev->obd_name));
- p += sprintf(&page[p], "uuid=%s\n", obddev->obd_uuid);
- p += sprintf(&page[p], "attached=1\n");
- p += sprintf(&page[p], "type=%s\n", MKSTR(obddev->obd_type->typ_name));
-
- if (obddev->obd_flags & OBD_SET_UP)
- p += sprintf(&page[p], "setup=1\n");
-
- /* print exports */
- {
- struct list_head *lh;
- struct obd_export *export = NULL;
-
- lh = &obddev->obd_exports;
- while ((lh = lh->next) != &obddev->obd_exports) {
- p += sprintf(&page[p],
- ((export == NULL) ? ", connections(" : ",") );
- export = list_entry(lh, struct obd_export,
- exp_obd_chain);
- p += sprintf(&page[p], "%p", export);
- }
- if (export != 0) { /* there was at least one export */
- p += sprintf(&page[p], ")");
- }
- }
-
- p += sprintf(&page[p], "\n");
-
- /* Compute eof and return value */
- if (offset + count >= p) {
- *eof = 1;
- return (p - offset);
- }
- return count;
-}
-
-struct proc_dir_entry *proc_lustre_register_obd_device(struct obd_device *obd)
-{
- struct proc_dir_entry *obd_dir;
- struct proc_dir_entry *obd_status = NULL;
-
- if (!proc_lustre_dir_entry) {
- proc_lustre_dir_entry = proc_mkdir("lustre", &proc_root);
- if (IS_ERR(proc_lustre_dir_entry))
- return 0;
-
- proc_lustre_obd_dir_entry =
- proc_mkdir("devices", proc_lustre_dir_entry);
- if (IS_ERR(proc_lustre_obd_dir_entry))
- return 0;
- }
- obd_dir = proc_mkdir(obd->obd_name, proc_lustre_obd_dir_entry);
-
- if (obd_dir)
- obd_status = create_proc_entry("status", S_IRUSR | S_IFREG,
- obd_dir);
-
- if (obd_status) {
- obd_status->read_proc = read_lustre_status;
- obd_status->data = (void *)obd;
- }
-
- return obd_dir;
-}
-
-void proc_lustre_remove_obd_entry(const char *name, struct obd_device *obd)
-{
- struct proc_dir_entry *obd_entry = NULL;
- struct proc_dir_entry *obd_dir = obd->obd_proc_entry;
-
- remove_proc_entry(name, obd_dir);
-
- while (obd_dir->subdir == NULL) {
- /* if we removed last entry in this directory, then
- * remove parent directory unless this is /proc itself */
- if (obd_dir == &proc_root)
- break;
-
- obd_entry = obd_dir;
- obd_dir = obd_dir->parent;
-
- /* If /proc/lustre/obd/foo or /proc/lustre/obd or
- * /proc/lustre is being removed, then reset internal
- * variables */
-
- if (obd_entry == obd->obd_proc_entry)
- obd->obd_proc_entry = NULL; /* /proc/lustre/obd/foo */
- else if (obd_entry == proc_lustre_obd_dir_entry)
- proc_lustre_obd_dir_entry = NULL; /* /proc/lustre/obd */
- else if (obd_entry == proc_lustre_dir_entry)
- proc_lustre_dir_entry = NULL; /* /proc/lustre */
-
- remove_proc_entry(obd_entry->name, obd_dir);
- }
- obd->obd_proc_entry = NULL;
-}
-
-void proc_lustre_release_obd_device(struct obd_device *obd)
-{
- proc_lustre_remove_obd_entry("status", obd);
-}
-
-
-#else /* CONFIG_PROC_FS */
-
-struct proc_dir_entry *proc_lustre_register_obd_device(struct obd_device *obd)
-{
- return 0;
-}
-
-void proc_lustre_remove_obd_entry(const char* name, struct obd_device *obd)
-{
-}
-
-void proc_lustre_release_obd_device(struct obd_device *obd)
-{
-}
-
-#endif /* CONFIG_PROC_FS */
-
-EXPORT_SYMBOL(proc_lustre_remove_obd_entry);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff