-/* proc_lustre.c manages /proc/lustre/obd.
+/* -*- 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 code is issued under the GNU General Public License.
- * See the file COPYING in this distribution
+ * 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.
*
- * OBD devices materialize in /proc as a directory:
+ * 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.
- *
+ * 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
+ * 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()
- * proc_lustre_release_obd_device()
- * proc_lustre_remove_obd_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,
*
* 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.
+ * function that is exported to other modules.
*/
#define EXPORT_SYMTAB
#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 = 0;
-static struct proc_dir_entry *proc_lustre_obd_dir_entry = 0;
-
-static struct proc_dir_entry *
-proc_lustre_mkdir(const char* dname, struct proc_dir_entry *parent)
-{
- struct proc_dir_entry *child_dir_entry;
-
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2,3,0) /*0x20300 */
- child_dir_entry = proc_mkdir(dname, parent);
-#else
- child_dir_entry = create_proc_entry(dname,
- S_IFDIR | S_IRUGO | S_IXUGO,
- &proc_root);
-#endif
- if (!child_dir_entry)
- printk ("lustre: failed to create /proc entry %s\n", dname);
-
- return child_dir_entry;
-}
+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)
+ int count, int *eof, void *data)
{
- struct obd_device * obddev = (struct obd_device *) data;
- int p;
-
- p = sprintf(&page[0], "/dev/obd%d: ", obddev->obd_minor);
-
- if (obddev->obd_refcnt==0) {
- /* obd is unused */
- p += sprintf(&page[p], "open but unused\n");
- }
- else { /* obd in use */
- p += sprintf(&page[p], "refcnt(%d)", obddev->obd_refcnt);
-
- if (obddev->obd_flags & OBD_ATTACHED) {
- p += sprintf(&page[p], ", attached(%s)",
- obddev->obd_type->typ_name);
- }
-
- if (obddev->obd_flags & OBD_SET_UP) {
- struct dentry *my_dentry;
- struct vfsmount *root_mnt;
- char *path;
- char *pathpage;
-
- if (!(pathpage = (char*) __get_free_page(GFP_KERNEL)))
- return -ENOMEM;
-
- my_dentry = obddev->obd_fsname.dentry;
- root_mnt = mntget(current->fs->rootmnt);
- path = d_path(my_dentry,root_mnt,pathpage,PAGE_SIZE);
-
- p += sprintf(&page[p], ", setup(%s)", path);
-
- free_page((unsigned long) pathpage);
- }
-
- /* print connections */
- {
- struct list_head * lh;
- struct obd_client * cli=0;
-
- lh = &obddev->obd_gen_clients;
- while ((lh = lh->next) != &obddev->obd_gen_clients) {
- p += sprintf(&page[p],
- ((cli==0) ? ", connections(" : ",") );
- cli = list_entry(lh, struct obd_client, cli_chain);
- p += sprintf(&page[p], "%d", cli->cli_id);
- } /* while */
- if (cli!=0) { /* there was at least one client */
- 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 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 *proc_lustre_register_obd_device(struct obd_device *obd)
{
- char obdname[32];
- struct proc_dir_entry *obd_dir;
- struct proc_dir_entry *obd_status = 0;
-
- if (!proc_lustre_dir_entry) {
- proc_lustre_dir_entry =
- proc_lustre_mkdir("lustre", &proc_root);
- if (!proc_lustre_dir_entry)
- return 0;
-
- proc_lustre_obd_dir_entry =
- proc_lustre_mkdir("obd", proc_lustre_dir_entry);
- if (!proc_lustre_obd_dir_entry)
- return 0;
- }
-
- sprintf(obdname, "%d", obd->obd_minor);
-
- obd_dir = proc_lustre_mkdir(obdname, 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;
+ 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)
+void proc_lustre_remove_obd_entry(const char *name, struct obd_device *obd)
{
- struct proc_dir_entry *obd_entry = 0;
- struct proc_dir_entry *obd_dir = obd->obd_proc_entry;
-
- remove_proc_entry(name, obd_dir);
-
- while (obd_dir->subdir==0) {
- /* 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/XXX or /proc/lustre/obd or
- * /proc/lustre are being removed, then reset
- * internal variables
- */
-
- if (obd_entry == obd->obd_proc_entry)
- obd->obd_proc_entry=0; /* /proc/lustre/obd/XXX */
- else
- if (obd_entry == proc_lustre_obd_dir_entry)
- proc_lustre_obd_dir_entry=0;
- else
- if (obd_entry == proc_lustre_dir_entry)
- proc_lustre_dir_entry=0;
-
- remove_proc_entry(obd_entry->name, obd_dir);
- }
+ 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);
+ proc_lustre_remove_obd_entry("status", obd);
}
struct proc_dir_entry *proc_lustre_register_obd_device(struct obd_device *obd)
{
- return 0;
+ 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);
-
-
-
-
-
-
-
-
+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