LXR linux/fs/exofs/exofs.h

   1/*
   2 * Copyright (C) 2005, 2006
   3 * Avishay Traeger (avishay@gmail.com)
   4 * Copyright (C) 2008, 2009
   5 * Boaz Harrosh <bharrosh@panasas.com>
   6 *
   7 * Copyrights for code taken from ext2:
   8 *     Copyright (C) 1992, 1993, 1994, 1995
   9 *     Remy Card (card@masi.ibp.fr)
  10 *     Laboratoire MASI - Institut Blaise Pascal
  11 *     Universite Pierre et Marie Curie (Paris VI)
  12 *     from
  13 *     linux/fs/minix/inode.c
  14 *     Copyright (C) 1991, 1992  Linus Torvalds
  15 *
  16 * This file is part of exofs.
  17 *
  18 * exofs is free software; you can redistribute it and/or modify
  19 * it under the terms of the GNU General Public License as published by
  20 * the Free Software Foundation.  Since it is based on ext2, and the only
  21 * valid version of GPL for the Linux kernel is version 2, the only valid
  22 * version of GPL for exofs is version 2.
  23 *
  24 * exofs is distributed in the hope that it will be useful,
  25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27 * GNU General Public License for more details.
  28 *
  29 * You should have received a copy of the GNU General Public License
  30 * along with exofs; if not, write to the Free Software
  31 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  32 */
  33
  34#include <linux/fs.h>
  35#include <linux/time.h>
  36#include "common.h"
  37
  38#ifndef __EXOFS_H__
  39#define __EXOFS_H__
  40
  41#define EXOFS_ERR(fmt, a...) printk(KERN_ERR "exofs: " fmt, ##a)
  42
  43#ifdef CONFIG_EXOFS_DEBUG
  44#define EXOFS_DBGMSG(fmt, a...) \
  45        printk(KERN_NOTICE "exofs @%s:%d: " fmt, __func__, __LINE__, ##a)
  46#else
  47#define EXOFS_DBGMSG(fmt, a...) \
  48        do { if (0) printk(fmt, ##a); } while (0)
  49#endif
  50
  51/* u64 has problems with printk this will cast it to unsigned long long */
  52#define _LLU(x) (unsigned long long)(x)
  53
  54/*
  55 * our extension to the in-memory superblock
  56 */
  57struct exofs_sb_info {
  58        struct osd_dev  *s_dev;                 /* returned by get_osd_dev    */
  59        osd_id          s_pid;                  /* partition ID of file system*/
  60        int             s_timeout;              /* timeout for OSD operations */
  61        uint64_t        s_nextid;               /* highest object ID used     */
  62        uint32_t        s_numfiles;             /* number of files on fs      */
  63        spinlock_t      s_next_gen_lock;        /* spinlock for gen # update  */
  64        u32             s_next_generation;      /* next gen # to use          */
  65        atomic_t        s_curr_pending;         /* number of pending commands */
  66        uint8_t         s_cred[OSD_CAP_LEN];    /* all-powerful credential    */
  67};
  68
  69/*
  70 * our extension to the in-memory inode
  71 */
  72struct exofs_i_info {
  73        unsigned long  i_flags;            /* various atomic flags            */
  74        uint32_t       i_data[EXOFS_IDATA];/*short symlink names and device #s*/
  75        uint32_t       i_dir_start_lookup; /* which page to start lookup      */
  76        wait_queue_head_t i_wq;            /* wait queue for inode            */
  77        uint64_t       i_commit_size;      /* the object's written length     */
  78        uint8_t        i_cred[OSD_CAP_LEN];/* all-powerful credential         */
  79        struct inode   vfs_inode;          /* normal in-memory inode          */
  80};
  81
  82/*
  83 * our inode flags
  84 */
  85#define OBJ_2BCREATED   0       /* object will be created soon*/
  86#define OBJ_CREATED     1       /* object has been created on the osd*/
  87
  88static inline int obj_2bcreated(struct exofs_i_info *oi)
  89{
  90        return test_bit(OBJ_2BCREATED, &oi->i_flags);
  91}
  92
  93static inline void set_obj_2bcreated(struct exofs_i_info *oi)
  94{
  95        set_bit(OBJ_2BCREATED, &oi->i_flags);
  96}
  97
  98static inline int obj_created(struct exofs_i_info *oi)
  99{
 100        return test_bit(OBJ_CREATED, &oi->i_flags);
 101}
 102
 103static inline void set_obj_created(struct exofs_i_info *oi)
 104{
 105        set_bit(OBJ_CREATED, &oi->i_flags);
 106}
 107
 108int __exofs_wait_obj_created(struct exofs_i_info *oi);
 109static inline int wait_obj_created(struct exofs_i_info *oi)
 110{
 111        if (likely(obj_created(oi)))
 112                return 0;
 113
 114        return __exofs_wait_obj_created(oi);
 115}
 116
 117/*
 118 * get to our inode from the vfs inode
 119 */
 120static inline struct exofs_i_info *exofs_i(struct inode *inode)
 121{
 122        return container_of(inode, struct exofs_i_info, vfs_inode);
 123}
 124
 125/*
 126 * Maximum count of links to a file
 127 */
 128#define EXOFS_LINK_MAX           32000
 129
 130/*************************
 131 * function declarations *
 132 *************************/
 133/* inode.c               */
 134void exofs_truncate(struct inode *inode);
 135int exofs_setattr(struct dentry *, struct iattr *);
 136int exofs_write_begin(struct file *file, struct address_space *mapping,
 137                loff_t pos, unsigned len, unsigned flags,
 138                struct page **pagep, void **fsdata);
 139extern struct inode *exofs_iget(struct super_block *, unsigned long);
 140struct inode *exofs_new_inode(struct inode *, int);
 141extern int exofs_write_inode(struct inode *, int);
 142extern void exofs_delete_inode(struct inode *);
 143
 144/* dir.c:                */
 145int exofs_add_link(struct dentry *, struct inode *);
 146ino_t exofs_inode_by_name(struct inode *, struct dentry *);
 147int exofs_delete_entry(struct exofs_dir_entry *, struct page *);
 148int exofs_make_empty(struct inode *, struct inode *);
 149struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *,
 150                                         struct page **);
 151int exofs_empty_dir(struct inode *);
 152struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **);
 153ino_t exofs_parent_ino(struct dentry *child);
 154int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *,
 155                    struct inode *);
 156
 157/* super.c               */
 158int exofs_sync_fs(struct super_block *sb, int wait);
 159
 160/*********************
 161 * operation vectors *
 162 *********************/
 163/* dir.c:            */
 164extern const struct file_operations exofs_dir_operations;
 165
 166/* file.c            */
 167extern const struct inode_operations exofs_file_inode_operations;
 168extern const struct file_operations exofs_file_operations;
 169
 170/* inode.c           */
 171extern const struct address_space_operations exofs_aops;
 172
 173/* namei.c           */
 174extern const struct inode_operations exofs_dir_inode_operations;
 175extern const struct inode_operations exofs_special_inode_operations;
 176
 177/* symlink.c         */
 178extern const struct inode_operations exofs_symlink_inode_operations;
 179extern const struct inode_operations exofs_fast_symlink_inode_operations;
 180
 181#endif
 182