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Message-Id: <1157031578.3384.807.camel@quoit.chygwyn.com>
Date: Thu, 31 Aug 2006 14:39:38 +0100
From: Steven Whitehouse <swhiteho@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: Russell Cattelan <cattelan@...hat.com>,
David Teigland <teigland@...hat.com>,
Ingo Molnar <mingo@...e.hu>, hch@...radead.org
Subject: [PATCH 12/16] GFS2: Mounting & sysfs interface
[PATCH 12/16] GFS2: Mounting & sysfs interface
Mount/umount routines and GFS2's sysfs interface.
Signed-off-by: Steven Whitehouse <swhiteho@...hat.com>
Signed-off-by: David Teigland <teigland@...hat.com>
fs/gfs2/mount.c | 214 ++++++++++++++++++++
fs/gfs2/mount.h | 15 +
fs/gfs2/sys.c | 579 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/gfs2/sys.h | 24 ++
4 files changed, 832 insertions(+)
--- /dev/null
+++ b/fs/gfs2/sys.c
@@ -0,0 +1,579 @@
+/*
+ * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+ * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License v.2.
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <linux/module.h>
+#include <linux/kobject.h>
+#include <linux/gfs2_ondisk.h>
+#include <asm/uaccess.h>
+
+#include "gfs2.h"
+#include "lm_interface.h"
+#include "incore.h"
+#include "lm.h"
+#include "sys.h"
+#include "super.h"
+#include "glock.h"
+#include "quota.h"
+#include "util.h"
+
+char *gfs2_sys_margs;
+spinlock_t gfs2_sys_margs_lock;
+
+static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
+{
+ return sprintf(buf, "%s\n", sdp->sd_vfs->s_id);
+}
+
+static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
+{
+ return sprintf(buf, "%s\n", sdp->sd_fsname);
+}
+
+static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
+{
+ unsigned int count;
+
+ mutex_lock(&sdp->sd_freeze_lock);
+ count = sdp->sd_freeze_count;
+ mutex_unlock(&sdp->sd_freeze_lock);
+
+ return sprintf(buf, "%u\n", count);
+}
+
+static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
+{
+ ssize_t ret = len;
+ int error = 0;
+ int n = simple_strtol(buf, NULL, 0);
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ switch (n) {
+ case 0:
+ gfs2_unfreeze_fs(sdp);
+ break;
+ case 1:
+ error = gfs2_freeze_fs(sdp);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ if (error)
+ fs_warn(sdp, "freeze %d error %d", n, error);
+
+ return ret;
+}
+
+static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
+{
+ unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
+ return sprintf(buf, "%u\n", b);
+}
+
+static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
+{
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (simple_strtol(buf, NULL, 0) != 1)
+ return -EINVAL;
+
+ gfs2_lm_withdraw(sdp,
+ "GFS2: fsid=%s: withdrawing from cluster at user's request\n",
+ sdp->sd_fsname);
+ return len;
+}
+
+static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
+ size_t len)
+{
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (simple_strtol(buf, NULL, 0) != 1)
+ return -EINVAL;
+
+ gfs2_statfs_sync(sdp);
+ return len;
+}
+
+static ssize_t shrink_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
+{
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (simple_strtol(buf, NULL, 0) != 1)
+ return -EINVAL;
+
+ gfs2_gl_hash_clear(sdp, NO_WAIT);
+ return len;
+}
+
+static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
+ size_t len)
+{
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (simple_strtol(buf, NULL, 0) != 1)
+ return -EINVAL;
+
+ gfs2_quota_sync(sdp);
+ return len;
+}
+
+static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
+ size_t len)
+{
+ uint32_t id;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ id = simple_strtoul(buf, NULL, 0);
+
+ gfs2_quota_refresh(sdp, 1, id);
+ return len;
+}
+
+static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
+ size_t len)
+{
+ uint32_t id;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ id = simple_strtoul(buf, NULL, 0);
+
+ gfs2_quota_refresh(sdp, 0, id);
+ return len;
+}
+
+struct gfs2_attr {
+ struct attribute attr;
+ ssize_t (*show)(struct gfs2_sbd *, char *);
+ ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
+};
+
+#define GFS2_ATTR(name, mode, show, store) \
+static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
+
+GFS2_ATTR(id, 0444, id_show, NULL);
+GFS2_ATTR(fsname, 0444, fsname_show, NULL);
+GFS2_ATTR(freeze, 0644, freeze_show, freeze_store);
+GFS2_ATTR(shrink, 0200, NULL, shrink_store);
+GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
+GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store);
+GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store);
+GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store);
+GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store);
+
+static struct attribute *gfs2_attrs[] = {
+ &gfs2_attr_id.attr,
+ &gfs2_attr_fsname.attr,
+ &gfs2_attr_freeze.attr,
+ &gfs2_attr_shrink.attr,
+ &gfs2_attr_withdraw.attr,
+ &gfs2_attr_statfs_sync.attr,
+ &gfs2_attr_quota_sync.attr,
+ &gfs2_attr_quota_refresh_user.attr,
+ &gfs2_attr_quota_refresh_group.attr,
+ NULL,
+};
+
+static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
+ char *buf)
+{
+ struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
+ struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
+ return a->show ? a->show(sdp, buf) : 0;
+}
+
+static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
+ const char *buf, size_t len)
+{
+ struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
+ struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
+ return a->store ? a->store(sdp, buf, len) : len;
+}
+
+static struct sysfs_ops gfs2_attr_ops = {
+ .show = gfs2_attr_show,
+ .store = gfs2_attr_store,
+};
+
+static struct kobj_type gfs2_ktype = {
+ .default_attrs = gfs2_attrs,
+ .sysfs_ops = &gfs2_attr_ops,
+};
+
+static struct kset gfs2_kset = {
+ .subsys = &fs_subsys,
+ .kobj = {.name = "gfs2",},
+ .ktype = &gfs2_ktype,
+};
+
+/*
+ * display struct lm_lockstruct fields
+ */
+
+struct lockstruct_attr {
+ struct attribute attr;
+ ssize_t (*show)(struct gfs2_sbd *, char *);
+};
+
+#define LOCKSTRUCT_ATTR(name, fmt) \
+static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
+{ \
+ return sprintf(buf, fmt, sdp->sd_lockstruct.ls_##name); \
+} \
+static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name)
+
+LOCKSTRUCT_ATTR(jid, "%u\n");
+LOCKSTRUCT_ATTR(first, "%u\n");
+LOCKSTRUCT_ATTR(lvb_size, "%u\n");
+LOCKSTRUCT_ATTR(flags, "%d\n");
+
+static struct attribute *lockstruct_attrs[] = {
+ &lockstruct_attr_jid.attr,
+ &lockstruct_attr_first.attr,
+ &lockstruct_attr_lvb_size.attr,
+ &lockstruct_attr_flags.attr,
+ NULL
+};
+
+/*
+ * display struct gfs2_args fields
+ */
+
+struct args_attr {
+ struct attribute attr;
+ ssize_t (*show)(struct gfs2_sbd *, char *);
+};
+
+#define ARGS_ATTR(name, fmt) \
+static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
+{ \
+ return sprintf(buf, fmt, sdp->sd_args.ar_##name); \
+} \
+static struct args_attr args_attr_##name = __ATTR_RO(name)
+
+ARGS_ATTR(lockproto, "%s\n");
+ARGS_ATTR(locktable, "%s\n");
+ARGS_ATTR(hostdata, "%s\n");
+ARGS_ATTR(spectator, "%d\n");
+ARGS_ATTR(ignore_local_fs, "%d\n");
+ARGS_ATTR(localcaching, "%d\n");
+ARGS_ATTR(localflocks, "%d\n");
+ARGS_ATTR(debug, "%d\n");
+ARGS_ATTR(upgrade, "%d\n");
+ARGS_ATTR(num_glockd, "%u\n");
+ARGS_ATTR(posix_acl, "%d\n");
+ARGS_ATTR(quota, "%u\n");
+ARGS_ATTR(suiddir, "%d\n");
+ARGS_ATTR(data, "%d\n");
+
+/* one oddball doesn't fit the macro mold */
+static ssize_t noatime_show(struct gfs2_sbd *sdp, char *buf)
+{
+ return sprintf(buf, "%d\n", !!test_bit(SDF_NOATIME, &sdp->sd_flags));
+}
+static struct args_attr args_attr_noatime = __ATTR_RO(noatime);
+
+static struct attribute *args_attrs[] = {
+ &args_attr_lockproto.attr,
+ &args_attr_locktable.attr,
+ &args_attr_hostdata.attr,
+ &args_attr_spectator.attr,
+ &args_attr_ignore_local_fs.attr,
+ &args_attr_localcaching.attr,
+ &args_attr_localflocks.attr,
+ &args_attr_debug.attr,
+ &args_attr_upgrade.attr,
+ &args_attr_num_glockd.attr,
+ &args_attr_posix_acl.attr,
+ &args_attr_quota.attr,
+ &args_attr_suiddir.attr,
+ &args_attr_data.attr,
+ &args_attr_noatime.attr,
+ NULL
+};
+
+/*
+ * display counters from superblock
+ */
+
+struct counters_attr {
+ struct attribute attr;
+ ssize_t (*show)(struct gfs2_sbd *, char *);
+};
+
+#define COUNTERS_ATTR(name, fmt) \
+static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
+{ \
+ return sprintf(buf, fmt, (unsigned int)atomic_read(&sdp->sd_##name)); \
+} \
+static struct counters_attr counters_attr_##name = __ATTR_RO(name)
+
+COUNTERS_ATTR(glock_count, "%u\n");
+COUNTERS_ATTR(glock_held_count, "%u\n");
+COUNTERS_ATTR(inode_count, "%u\n");
+COUNTERS_ATTR(reclaimed, "%u\n");
+
+static struct attribute *counters_attrs[] = {
+ &counters_attr_glock_count.attr,
+ &counters_attr_glock_held_count.attr,
+ &counters_attr_inode_count.attr,
+ &counters_attr_reclaimed.attr,
+ NULL
+};
+
+/*
+ * get and set struct gfs2_tune fields
+ */
+
+static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
+{
+ return sprintf(buf, "%u %u\n", sdp->sd_tune.gt_quota_scale_num,
+ sdp->sd_tune.gt_quota_scale_den);
+}
+
+static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
+ size_t len)
+{
+ struct gfs2_tune *gt = &sdp->sd_tune;
+ unsigned int x, y;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
+ return -EINVAL;
+
+ spin_lock(>->gt_spin);
+ gt->gt_quota_scale_num = x;
+ gt->gt_quota_scale_den = y;
+ spin_unlock(>->gt_spin);
+ return len;
+}
+
+static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
+ int check_zero, const char *buf, size_t len)
+{
+ struct gfs2_tune *gt = &sdp->sd_tune;
+ unsigned int x;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ x = simple_strtoul(buf, NULL, 0);
+
+ if (check_zero && !x)
+ return -EINVAL;
+
+ spin_lock(>->gt_spin);
+ *field = x;
+ spin_unlock(>->gt_spin);
+ return len;
+}
+
+struct tune_attr {
+ struct attribute attr;
+ ssize_t (*show)(struct gfs2_sbd *, char *);
+ ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
+};
+
+#define TUNE_ATTR_3(name, show, store) \
+static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store)
+
+#define TUNE_ATTR_2(name, store) \
+static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
+{ \
+ return sprintf(buf, "%u\n", sdp->sd_tune.gt_##name); \
+} \
+TUNE_ATTR_3(name, name##_show, store)
+
+#define TUNE_ATTR(name, check_zero) \
+static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
+{ \
+ return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \
+} \
+TUNE_ATTR_2(name, name##_store)
+
+#define TUNE_ATTR_DAEMON(name, process) \
+static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
+{ \
+ ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len); \
+ wake_up_process(sdp->sd_##process); \
+ return r; \
+} \
+TUNE_ATTR_2(name, name##_store)
+
+TUNE_ATTR(ilimit, 0);
+TUNE_ATTR(ilimit_tries, 0);
+TUNE_ATTR(ilimit_min, 0);
+TUNE_ATTR(demote_secs, 0);
+TUNE_ATTR(incore_log_blocks, 0);
+TUNE_ATTR(log_flush_secs, 0);
+TUNE_ATTR(jindex_refresh_secs, 0);
+TUNE_ATTR(quota_warn_period, 0);
+TUNE_ATTR(quota_quantum, 0);
+TUNE_ATTR(atime_quantum, 0);
+TUNE_ATTR(max_readahead, 0);
+TUNE_ATTR(complain_secs, 0);
+TUNE_ATTR(reclaim_limit, 0);
+TUNE_ATTR(prefetch_secs, 0);
+TUNE_ATTR(statfs_slow, 0);
+TUNE_ATTR(new_files_jdata, 0);
+TUNE_ATTR(new_files_directio, 0);
+TUNE_ATTR(quota_simul_sync, 1);
+TUNE_ATTR(quota_cache_secs, 1);
+TUNE_ATTR(max_atomic_write, 1);
+TUNE_ATTR(stall_secs, 1);
+TUNE_ATTR(entries_per_readdir, 1);
+TUNE_ATTR(greedy_default, 1);
+TUNE_ATTR(greedy_quantum, 1);
+TUNE_ATTR(greedy_max, 1);
+TUNE_ATTR(statfs_quantum, 1);
+TUNE_ATTR_DAEMON(scand_secs, scand_process);
+TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process);
+TUNE_ATTR_DAEMON(logd_secs, logd_process);
+TUNE_ATTR_DAEMON(quotad_secs, quotad_process);
+TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
+
+static struct attribute *tune_attrs[] = {
+ &tune_attr_ilimit.attr,
+ &tune_attr_ilimit_tries.attr,
+ &tune_attr_ilimit_min.attr,
+ &tune_attr_demote_secs.attr,
+ &tune_attr_incore_log_blocks.attr,
+ &tune_attr_log_flush_secs.attr,
+ &tune_attr_jindex_refresh_secs.attr,
+ &tune_attr_quota_warn_period.attr,
+ &tune_attr_quota_quantum.attr,
+ &tune_attr_atime_quantum.attr,
+ &tune_attr_max_readahead.attr,
+ &tune_attr_complain_secs.attr,
+ &tune_attr_reclaim_limit.attr,
+ &tune_attr_prefetch_secs.attr,
+ &tune_attr_statfs_slow.attr,
+ &tune_attr_quota_simul_sync.attr,
+ &tune_attr_quota_cache_secs.attr,
+ &tune_attr_max_atomic_write.attr,
+ &tune_attr_stall_secs.attr,
+ &tune_attr_entries_per_readdir.attr,
+ &tune_attr_greedy_default.attr,
+ &tune_attr_greedy_quantum.attr,
+ &tune_attr_greedy_max.attr,
+ &tune_attr_statfs_quantum.attr,
+ &tune_attr_scand_secs.attr,
+ &tune_attr_recoverd_secs.attr,
+ &tune_attr_logd_secs.attr,
+ &tune_attr_quotad_secs.attr,
+ &tune_attr_quota_scale.attr,
+ &tune_attr_new_files_jdata.attr,
+ &tune_attr_new_files_directio.attr,
+ NULL
+};
+
+static struct attribute_group lockstruct_group = {
+ .name = "lockstruct",
+ .attrs = lockstruct_attrs
+};
+
+static struct attribute_group counters_group = {
+ .name = "counters",
+ .attrs = counters_attrs
+};
+
+static struct attribute_group args_group = {
+ .name = "args",
+ .attrs = args_attrs
+};
+
+static struct attribute_group tune_group = {
+ .name = "tune",
+ .attrs = tune_attrs
+};
+
+int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
+{
+ int error;
+
+ sdp->sd_kobj.kset = &gfs2_kset;
+ sdp->sd_kobj.ktype = &gfs2_ktype;
+
+ error = kobject_set_name(&sdp->sd_kobj, "%s", sdp->sd_table_name);
+ if (error)
+ goto fail;
+
+ error = kobject_register(&sdp->sd_kobj);
+ if (error)
+ goto fail;
+
+ error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group);
+ if (error)
+ goto fail_reg;
+
+ error = sysfs_create_group(&sdp->sd_kobj, &counters_group);
+ if (error)
+ goto fail_lockstruct;
+
+ error = sysfs_create_group(&sdp->sd_kobj, &args_group);
+ if (error)
+ goto fail_counters;
+
+ error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
+ if (error)
+ goto fail_args;
+
+ return 0;
+
+ fail_args:
+ sysfs_remove_group(&sdp->sd_kobj, &args_group);
+ fail_counters:
+ sysfs_remove_group(&sdp->sd_kobj, &counters_group);
+ fail_lockstruct:
+ sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
+ fail_reg:
+ kobject_unregister(&sdp->sd_kobj);
+ fail:
+ return error;
+}
+
+void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
+{
+ sysfs_remove_group(&sdp->sd_kobj, &tune_group);
+ sysfs_remove_group(&sdp->sd_kobj, &args_group);
+ sysfs_remove_group(&sdp->sd_kobj, &counters_group);
+ sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
+ kobject_unregister(&sdp->sd_kobj);
+}
+
+int gfs2_sys_init(void)
+{
+ gfs2_sys_margs = NULL;
+ spin_lock_init(&gfs2_sys_margs_lock);
+ return kset_register(&gfs2_kset);
+}
+
+void gfs2_sys_uninit(void)
+{
+ kfree(gfs2_sys_margs);
+ kset_unregister(&gfs2_kset);
+}
+
--- /dev/null
+++ b/fs/gfs2/sys.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+ * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License v.2.
+ */
+
+#ifndef __SYS_DOT_H__
+#define __SYS_DOT_H__
+
+/* Allow args to be passed to GFS2 when using an initial ram disk */
+extern char *gfs2_sys_margs;
+extern spinlock_t gfs2_sys_margs_lock;
+
+int gfs2_sys_fs_add(struct gfs2_sbd *sdp);
+void gfs2_sys_fs_del(struct gfs2_sbd *sdp);
+
+int gfs2_sys_init(void);
+void gfs2_sys_uninit(void);
+
+#endif /* __SYS_DOT_H__ */
+
--- /dev/null
+++ b/fs/gfs2/mount.c
@@ -0,0 +1,214 @@
+/*
+ * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+ * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License v.2.
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <linux/gfs2_ondisk.h>
+
+#include "gfs2.h"
+#include "lm_interface.h"
+#include "incore.h"
+#include "mount.h"
+#include "sys.h"
+#include "util.h"
+
+/**
+ * gfs2_mount_args - Parse mount options
+ * @sdp:
+ * @data:
+ *
+ * Return: errno
+ */
+
+int gfs2_mount_args(struct gfs2_sbd *sdp, char *data_arg, int remount)
+{
+ struct gfs2_args *args = &sdp->sd_args;
+ char *data = data_arg;
+ char *options, *o, *v;
+ int error = 0;
+
+ if (!remount) {
+ /* If someone preloaded options, use those instead */
+ spin_lock(&gfs2_sys_margs_lock);
+ if (gfs2_sys_margs) {
+ data = gfs2_sys_margs;
+ gfs2_sys_margs = NULL;
+ }
+ spin_unlock(&gfs2_sys_margs_lock);
+
+ /* Set some defaults */
+ args->ar_num_glockd = GFS2_GLOCKD_DEFAULT;
+ args->ar_quota = GFS2_QUOTA_DEFAULT;
+ args->ar_data = GFS2_DATA_DEFAULT;
+ }
+
+ /* Split the options into tokens with the "," character and
+ process them */
+
+ for (options = data; (o = strsep(&options, ",")); ) {
+ if (!*o)
+ continue;
+
+ v = strchr(o, '=');
+ if (v)
+ *v++ = 0;
+
+ if (!strcmp(o, "lockproto")) {
+ if (!v)
+ goto need_value;
+ if (remount && strcmp(v, args->ar_lockproto))
+ goto cant_remount;
+ strncpy(args->ar_lockproto, v, GFS2_LOCKNAME_LEN);
+ args->ar_lockproto[GFS2_LOCKNAME_LEN - 1] = 0;
+ }
+
+ else if (!strcmp(o, "locktable")) {
+ if (!v)
+ goto need_value;
+ if (remount && strcmp(v, args->ar_locktable))
+ goto cant_remount;
+ strncpy(args->ar_locktable, v, GFS2_LOCKNAME_LEN);
+ args->ar_locktable[GFS2_LOCKNAME_LEN - 1] = 0;
+ }
+
+ else if (!strcmp(o, "hostdata")) {
+ if (!v)
+ goto need_value;
+ if (remount && strcmp(v, args->ar_hostdata))
+ goto cant_remount;
+ strncpy(args->ar_hostdata, v, GFS2_LOCKNAME_LEN);
+ args->ar_hostdata[GFS2_LOCKNAME_LEN - 1] = 0;
+ }
+
+ else if (!strcmp(o, "spectator")) {
+ if (remount && !args->ar_spectator)
+ goto cant_remount;
+ args->ar_spectator = 1;
+ sdp->sd_vfs->s_flags |= MS_RDONLY;
+ }
+
+ else if (!strcmp(o, "ignore_local_fs")) {
+ if (remount && !args->ar_ignore_local_fs)
+ goto cant_remount;
+ args->ar_ignore_local_fs = 1;
+ }
+
+ else if (!strcmp(o, "localflocks")) {
+ if (remount && !args->ar_localflocks)
+ goto cant_remount;
+ args->ar_localflocks = 1;
+ }
+
+ else if (!strcmp(o, "localcaching")) {
+ if (remount && !args->ar_localcaching)
+ goto cant_remount;
+ args->ar_localcaching = 1;
+ }
+
+ else if (!strcmp(o, "debug"))
+ args->ar_debug = 1;
+
+ else if (!strcmp(o, "nodebug"))
+ args->ar_debug = 0;
+
+ else if (!strcmp(o, "upgrade")) {
+ if (remount && !args->ar_upgrade)
+ goto cant_remount;
+ args->ar_upgrade = 1;
+ }
+
+ else if (!strcmp(o, "num_glockd")) {
+ unsigned int x;
+ if (!v)
+ goto need_value;
+ sscanf(v, "%u", &x);
+ if (remount && x != args->ar_num_glockd)
+ goto cant_remount;
+ if (!x || x > GFS2_GLOCKD_MAX) {
+ fs_info(sdp, "0 < num_glockd <= %u (not %u)\n",
+ GFS2_GLOCKD_MAX, x);
+ error = -EINVAL;
+ break;
+ }
+ args->ar_num_glockd = x;
+ }
+
+ else if (!strcmp(o, "acl")) {
+ args->ar_posix_acl = 1;
+ sdp->sd_vfs->s_flags |= MS_POSIXACL;
+ }
+
+ else if (!strcmp(o, "noacl")) {
+ args->ar_posix_acl = 0;
+ sdp->sd_vfs->s_flags &= ~MS_POSIXACL;
+ }
+
+ else if (!strcmp(o, "quota")) {
+ if (!v)
+ goto need_value;
+ if (!strcmp(v, "off"))
+ args->ar_quota = GFS2_QUOTA_OFF;
+ else if (!strcmp(v, "account"))
+ args->ar_quota = GFS2_QUOTA_ACCOUNT;
+ else if (!strcmp(v, "on"))
+ args->ar_quota = GFS2_QUOTA_ON;
+ else {
+ fs_info(sdp, "invalid value for quota\n");
+ error = -EINVAL;
+ break;
+ }
+ }
+
+ else if (!strcmp(o, "suiddir"))
+ args->ar_suiddir = 1;
+
+ else if (!strcmp(o, "nosuiddir"))
+ args->ar_suiddir = 0;
+
+ else if (!strcmp(o, "data")) {
+ if (!v)
+ goto need_value;
+ if (!strcmp(v, "writeback"))
+ args->ar_data = GFS2_DATA_WRITEBACK;
+ else if (!strcmp(v, "ordered"))
+ args->ar_data = GFS2_DATA_ORDERED;
+ else {
+ fs_info(sdp, "invalid value for data\n");
+ error = -EINVAL;
+ break;
+ }
+ }
+
+ else {
+ fs_info(sdp, "unknown option: %s\n", o);
+ error = -EINVAL;
+ break;
+ }
+ }
+
+ if (error)
+ fs_info(sdp, "invalid mount option(s)\n");
+
+ if (data != data_arg)
+ kfree(data);
+
+ return error;
+
+ need_value:
+ fs_info(sdp, "need value for option %s\n", o);
+ return -EINVAL;
+
+ cant_remount:
+ fs_info(sdp, "can't remount with option %s\n", o);
+ return -EINVAL;
+}
+
--- /dev/null
+++ b/fs/gfs2/mount.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+ * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License v.2.
+ */
+
+#ifndef __MOUNT_DOT_H__
+#define __MOUNT_DOT_H__
+
+int gfs2_mount_args(struct gfs2_sbd *sdp, char *data_arg, int remount);
+
+#endif /* __MOUNT_DOT_H__ */
-
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