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linux/fs/exofs/exofs.h
Boaz Harrosh 1cea312ad4 exofs: Write sbi->s_nextid as part of the Create command 
Before when creating a new inode, we'd set the sb->s_dirt flag,
and sometime later the system would write out s_nextid as part
of the sb_info. Also on inode sync we would force the sb sync
as well.

Define the s_nextid as a new partition attribute and set it
every time we create a new object.
At mount we read it from it's new place.

We now never set sb->s_dirt anywhere in exofs. write_super
is actually never called. The call to exofs_write_super from
exofs_put_super is also removed because the VFS always calls
->sync_fs before calling ->put_super twice.

To stay backward-and-forward compatible we also write the old
s_nextid in the super_block object at unmount, and support zero
length attribute on mount.

This also fixes a BUG where in layouts when group_width was not
a divisor of EXOFS_SUPER_ID (0x10000) the s_nextid was not read
from the device it was written to. Because of the sliding window
layout trick, and because the read was always done from the 0
device but the write was done via the raid engine that might slide
the device view. Now we read and write through the raid engine.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
2011-03-15 15:02:51 +02:00

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/*
* Copyright (C) 2005, 2006
* Avishay Traeger (avishay@gmail.com)
* Copyright (C) 2008, 2009
* Boaz Harrosh <bharrosh@panasas.com>
*
* Copyrights for code taken from ext2:
* Copyright (C) 1992, 1993, 1994, 1995
* Remy Card (card@masi.ibp.fr)
* Laboratoire MASI - Institut Blaise Pascal
* Universite Pierre et Marie Curie (Paris VI)
* from
* linux/fs/minix/inode.c
* Copyright (C) 1991, 1992 Linus Torvalds
*
* This file is part of exofs.
*
* exofs is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation. Since it is based on ext2, and the only
* valid version of GPL for the Linux kernel is version 2, the only valid
* version of GPL for exofs is version 2.
*
* exofs 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 exofs; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __EXOFS_H__
#define __EXOFS_H__
#include <linux/fs.h>
#include <linux/time.h>
#include <linux/backing-dev.h>
#include "common.h"
/* FIXME: Remove once pnfs hits mainline
* #include <linux/exportfs/pnfs_osd_xdr.h>
*/
#include "pnfs.h"
#define EXOFS_ERR(fmt, a...) printk(KERN_ERR "exofs: " fmt, ##a)
#ifdef CONFIG_EXOFS_DEBUG
#define EXOFS_DBGMSG(fmt, a...) \
printk(KERN_NOTICE "exofs @%s:%d: " fmt, __func__, __LINE__, ##a)
#else
#define EXOFS_DBGMSG(fmt, a...) \
do { if (0) printk(fmt, ##a); } while (0)
#endif
/* u64 has problems with printk this will cast it to unsigned long long */
#define _LLU(x) (unsigned long long)(x)
struct exofs_layout {
osd_id s_pid; /* partition ID of file system*/
/* Our way of looking at the data_map */
unsigned stripe_unit;
unsigned mirrors_p1;
unsigned group_width;
u64 group_depth;
unsigned group_count;
enum exofs_inode_layout_gen_functions lay_func;
unsigned s_numdevs; /* Num of devices in array */
struct osd_dev *s_ods[0]; /* Variable length */
};
/*
* our extension to the in-memory superblock
*/
struct exofs_sb_info {
struct exofs_sb_stats s_ess; /* Written often, pre-allocate*/
int s_timeout; /* timeout for OSD operations */
uint64_t s_nextid; /* highest object ID used */
uint32_t s_numfiles; /* number of files on fs */
spinlock_t s_next_gen_lock; /* spinlock for gen # update */
u32 s_next_generation; /* next gen # to use */
atomic_t s_curr_pending; /* number of pending commands */
uint8_t s_cred[OSD_CAP_LEN]; /* credential for the fscb */
struct backing_dev_info bdi; /* register our bdi with VFS */
struct pnfs_osd_data_map data_map; /* Default raid to use
* FIXME: Needed ?
*/
/* struct exofs_layout dir_layout;*/ /* Default dir layout */
struct exofs_layout layout; /* Default files layout,
* contains the variable osd_dev
* array. Keep last */
struct osd_dev *_min_one_dev[1]; /* Place holder for one dev */
};
/*
* our extension to the in-memory inode
*/
struct exofs_i_info {
struct inode vfs_inode; /* normal in-memory inode */
wait_queue_head_t i_wq; /* wait queue for inode */
unsigned long i_flags; /* various atomic flags */
uint32_t i_data[EXOFS_IDATA];/*short symlink names and device #s*/
uint32_t i_dir_start_lookup; /* which page to start lookup */
uint64_t i_commit_size; /* the object's written length */
uint8_t i_cred[OSD_CAP_LEN];/* all-powerful credential */
};
static inline osd_id exofs_oi_objno(struct exofs_i_info *oi)
{
return oi->vfs_inode.i_ino + EXOFS_OBJ_OFF;
}
struct exofs_io_state;
typedef void (*exofs_io_done_fn)(struct exofs_io_state *or, void *private);
struct exofs_io_state {
struct kref kref;
void *private;
exofs_io_done_fn done;
struct exofs_layout *layout;
struct osd_obj_id obj;
u8 *cred;
/* Global read/write IO*/
loff_t offset;
unsigned long length;
void *kern_buff;
struct page **pages;
unsigned nr_pages;
unsigned pgbase;
unsigned pages_consumed;
/* Attributes */
unsigned in_attr_len;
struct osd_attr *in_attr;
unsigned out_attr_len;
struct osd_attr *out_attr;
/* Variable array of size numdevs */
unsigned numdevs;
struct exofs_per_dev_state {
struct osd_request *or;
struct bio *bio;
loff_t offset;
unsigned length;
unsigned dev;
} per_dev[];
};
static inline unsigned exofs_io_state_size(unsigned numdevs)
{
return sizeof(struct exofs_io_state) +
sizeof(struct exofs_per_dev_state) * numdevs;
}
/*
* our inode flags
*/
#define OBJ_2BCREATED 0 /* object will be created soon*/
#define OBJ_CREATED 1 /* object has been created on the osd*/
static inline int obj_2bcreated(struct exofs_i_info *oi)
{
return test_bit(OBJ_2BCREATED, &oi->i_flags);
}
static inline void set_obj_2bcreated(struct exofs_i_info *oi)
{
set_bit(OBJ_2BCREATED, &oi->i_flags);
}
static inline int obj_created(struct exofs_i_info *oi)
{
return test_bit(OBJ_CREATED, &oi->i_flags);
}
static inline void set_obj_created(struct exofs_i_info *oi)
{
set_bit(OBJ_CREATED, &oi->i_flags);
}
int __exofs_wait_obj_created(struct exofs_i_info *oi);
static inline int wait_obj_created(struct exofs_i_info *oi)
{
if (likely(obj_created(oi)))
return 0;
return __exofs_wait_obj_created(oi);
}
/*
* get to our inode from the vfs inode
*/
static inline struct exofs_i_info *exofs_i(struct inode *inode)
{
return container_of(inode, struct exofs_i_info, vfs_inode);
}
/*
* Given a layout, object_number and stripe_index return the associated global
* dev_index
*/
unsigned exofs_layout_od_id(struct exofs_layout *layout,
osd_id obj_no, unsigned layout_index);
/*
* Maximum count of links to a file
*/
#define EXOFS_LINK_MAX 32000
/*************************
* function declarations *
*************************/
/* ios.c */
void exofs_make_credential(u8 cred_a[OSD_CAP_LEN],
const struct osd_obj_id *obj);
int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj,
u64 offset, void *p, unsigned length);
int exofs_get_io_state(struct exofs_layout *layout,
struct exofs_io_state **ios);
void exofs_put_io_state(struct exofs_io_state *ios);
int exofs_check_io(struct exofs_io_state *ios, u64 *resid);
int exofs_sbi_create(struct exofs_io_state *ios);
int exofs_sbi_remove(struct exofs_io_state *ios);
int exofs_sbi_write(struct exofs_io_state *ios);
int exofs_sbi_read(struct exofs_io_state *ios);
int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr);
int exofs_oi_truncate(struct exofs_i_info *oi, u64 new_len);
static inline int exofs_oi_write(struct exofs_i_info *oi,
struct exofs_io_state *ios)
{
ios->obj.id = exofs_oi_objno(oi);
ios->cred = oi->i_cred;
return exofs_sbi_write(ios);
}
static inline int exofs_oi_read(struct exofs_i_info *oi,
struct exofs_io_state *ios)
{
ios->obj.id = exofs_oi_objno(oi);
ios->cred = oi->i_cred;
return exofs_sbi_read(ios);
}
/* inode.c */
unsigned exofs_max_io_pages(struct exofs_layout *layout,
unsigned expected_pages);
int exofs_setattr(struct dentry *, struct iattr *);
int exofs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata);
extern struct inode *exofs_iget(struct super_block *, unsigned long);
struct inode *exofs_new_inode(struct inode *, int);
extern int exofs_write_inode(struct inode *, struct writeback_control *wbc);
extern void exofs_evict_inode(struct inode *);
/* dir.c: */
int exofs_add_link(struct dentry *, struct inode *);
ino_t exofs_inode_by_name(struct inode *, struct dentry *);
int exofs_delete_entry(struct exofs_dir_entry *, struct page *);
int exofs_make_empty(struct inode *, struct inode *);
struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *,
struct page **);
int exofs_empty_dir(struct inode *);
struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **);
ino_t exofs_parent_ino(struct dentry *child);
int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *,
struct inode *);
/* super.c */
int exofs_sbi_write_stats(struct exofs_sb_info *sbi);
/*********************
* operation vectors *
*********************/
/* dir.c: */
extern const struct file_operations exofs_dir_operations;
/* file.c */
extern const struct inode_operations exofs_file_inode_operations;
extern const struct file_operations exofs_file_operations;
/* inode.c */
extern const struct address_space_operations exofs_aops;
extern const struct osd_attr g_attr_logical_length;
/* namei.c */
extern const struct inode_operations exofs_dir_inode_operations;
extern const struct inode_operations exofs_special_inode_operations;
/* symlink.c */
extern const struct inode_operations exofs_symlink_inode_operations;
extern const struct inode_operations exofs_fast_symlink_inode_operations;
#endif
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