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alistair23-linux/fs/gfs2/sys.c
Steven Whitehouse feaa7bba02 [GFS2] Fix unlinked file handling 
This patch fixes the way we have been dealing with unlinked,
but still open files. It removes all limits (other than memory
for inodes, as per every other filesystem) on numbers of these
which we can support on GFS2. It also means that (like other
fs) its the responsibility of the last process to close the file
to deallocate the storage, rather than the person who did the
unlinking. Note that with GFS2, those two events might take place
on different nodes.

Also there are a number of other changes:

 o We use the Linux inode subsystem as it was intended to be
used, wrt allocating GFS2 inodes
 o The Linux inode cache is now the point which we use for
local enforcement of only holding one copy of the inode in
core at once (previous to this we used the glock layer).
 o We no longer use the unlinked "special" file. We just ignore it
completely. This makes unlinking more efficient.
 o We now use the 4th block allocation state. The previously unused
state is used to track unlinked but still open inodes.
 o gfs2_inoded is no longer needed
 o Several fields are now no longer needed (and removed) from the in
core struct gfs2_inode
 o Several fields are no longer needed (and removed) from the in core
superblock

There are a number of future possible optimisations and clean ups
which have been made possible by this patch.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-06-14 15:32:57 -04:00

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/*
* 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->gt_spin);
gt->gt_quota_scale_num = x;
gt->gt_quota_scale_den = y;
spin_unlock(&gt->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->gt_spin);
*field = x;
spin_unlock(&gt->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);
}
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