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/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* This program 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 version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
* GPL HEADER END
*/
/*
* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2012, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*
* lustre/include/linux/lustre_fsfilt.h
*
* Filesystem interface helper.
*/
#ifndef _LINUX_LUSTRE_FSFILT_H
#define _LINUX_LUSTRE_FSFILT_H
#ifndef _LUSTRE_FSFILT_H
#error Do not #include this file directly. #include <lustre_fsfilt.h> instead
#endif
#include "../obd.h"
#include "../obd_class.h"
typedef void (*fsfilt_cb_t)(struct obd_device *obd, __u64 last_rcvd,
void *data, int error);
struct fsfilt_operations {
struct list_head fs_list;
struct module *fs_owner;
char *fs_type;
char *(* fs_getlabel)(struct super_block *sb);
void *(* fs_start)(struct inode *inode, int op, void *desc_private,
int logs);
int (* fs_commit)(struct inode *inode, void *handle,int force_sync);
int (* fs_map_inode_pages)(struct inode *inode, struct page **page,
int pages, unsigned long *blocks,
int create, struct mutex *sem);
int (* fs_write_record)(struct file *, void *, int size, loff_t *,
int force_sync);
int (* fs_read_record)(struct file *, void *, int size, loff_t *);
int (* fs_setup)(struct super_block *sb);
};
extern int fsfilt_register_ops(struct fsfilt_operations *fs_ops);
extern void fsfilt_unregister_ops(struct fsfilt_operations *fs_ops);
extern struct fsfilt_operations *fsfilt_get_ops(const char *type);
extern void fsfilt_put_ops(struct fsfilt_operations *fs_ops);
static inline char *fsfilt_get_label(struct obd_device *obd,
struct super_block *sb)
{
if (obd->obd_fsops->fs_getlabel == NULL)
return NULL;
if (obd->obd_fsops->fs_getlabel(sb)[0] == '\0')
return NULL;
return obd->obd_fsops->fs_getlabel(sb);
}
#define FSFILT_OP_UNLINK 1
#define FSFILT_OP_CANCEL_UNLINK 10
#define __fsfilt_check_slow(obd, start, msg) \
do { \
if (time_before(jiffies, start + 15 * HZ)) \
break; \
else if (time_before(jiffies, start + 30 * HZ)) \
CDEBUG(D_VFSTRACE, "%s: slow %s %lus\n", obd->obd_name, \
msg, (jiffies-start) / HZ); \
else if (time_before(jiffies, start + DISK_TIMEOUT * HZ)) \
CWARN("%s: slow %s %lus\n", obd->obd_name, msg, \
(jiffies - start) / HZ); \
else \
CERROR("%s: slow %s %lus\n", obd->obd_name, msg, \
(jiffies - start) / HZ); \
} while (0)
#define fsfilt_check_slow(obd, start, msg) \
do { \
__fsfilt_check_slow(obd, start, msg); \
start = jiffies; \
} while (0)
static inline void *fsfilt_start_log(struct obd_device *obd,
struct inode *inode, int op,
struct obd_trans_info *oti, int logs)
{
unsigned long now = jiffies;
void *parent_handle = oti ? oti->oti_handle : NULL;
void *handle;
handle = obd->obd_fsops->fs_start(inode, op, parent_handle, logs);
CDEBUG(D_INFO, "started handle %p (%p)\n", handle, parent_handle);
if (oti != NULL) {
if (parent_handle == NULL) {
oti->oti_handle = handle;
} else if (handle != parent_handle) {
CERROR("mismatch: parent %p, handle %p, oti %p\n",
parent_handle, handle, oti);
LBUG();
}
}
fsfilt_check_slow(obd, now, "journal start");
return handle;
}
static inline int fsfilt_commit(struct obd_device *obd, struct inode *inode,
void *handle, int force_sync)
{
unsigned long now = jiffies;
int rc = obd->obd_fsops->fs_commit(inode, handle, force_sync);
CDEBUG(D_INFO, "committing handle %p\n", handle);
fsfilt_check_slow(obd, now, "journal start");
return rc;
}
static inline int fsfilt_read_record(struct obd_device *obd, struct file *file,
void *buf, loff_t size, loff_t *offs)
{
return obd->obd_fsops->fs_read_record(file, buf, size, offs);
}
static inline int fsfilt_write_record(struct obd_device *obd, struct file *file,
void *buf, loff_t size, loff_t *offs,
int force_sync)
{
return obd->obd_fsops->fs_write_record(file, buf, size,offs,force_sync);
}
static inline int fsfilt_setup(struct obd_device *obd, struct super_block *fs)
{
if (obd->obd_fsops->fs_setup)
return obd->obd_fsops->fs_setup(fs);
return 0;
}
#endif
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