fs/exofs/exofs.h

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