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  */
  57 struct 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  */
  72 struct 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
  88 static inline int obj_2bcreated(struct exofs_i_info *oi)
  89 {
  90         return test_bit(OBJ_2BCREATED, &oi->i_flags);
  91 }
  92
  93 static inline void set_obj_2bcreated(struct exofs_i_info *oi)
  94 {
  95         set_bit(OBJ_2BCREATED, &oi->i_flags);
  96 }
  97
  98 static inline int obj_created(struct exofs_i_info *oi)
  99 {
 100         return test_bit(OBJ_CREATED, &oi->i_flags);
 101 }
 102
 103 static inline void set_obj_created(struct exofs_i_info *oi)
 104 {
 105         set_bit(OBJ_CREATED, &oi->i_flags);
 106 }
 107
 108 int __exofs_wait_obj_created(struct exofs_i_info *oi);
 109 static 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  */
 120 static 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               */
 134 void exofs_truncate(struct inode *inode);
 135 int exofs_setattr(struct dentry *, struct iattr *);
 136 int exofs_write_begin(struct file *file, struct address_space *mapping,
 137                 loff_t pos, unsigned len, unsigned flags,
 138                 struct page **pagep, void **fsdata);
 139 extern struct inode *exofs_iget(struct super_block *, unsigned long);
 140 struct inode *exofs_new_inode(struct inode *, int);
 141 extern int exofs_write_inode(struct inode *, int);
 142 extern void exofs_delete_inode(struct inode *);
 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 ino_t exofs_parent_ino(struct dentry *child);
 154 int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *,
 155                     struct inode *);
 156
 157 /* super.c               */
 158 int exofs_sync_fs(struct super_block *sb, int wait);
 159
 160 /*********************
 161  * operation vectors *
 162  *********************/
 163 /* dir.c:            */
 164 extern const struct file_operations exofs_dir_operations;
 165
 166 /* file.c            */
 167 extern const struct inode_operations exofs_file_inode_operations;
 168 extern const struct file_operations exofs_file_operations;
 169
 170 /* inode.c           */
 171 extern const struct address_space_operations exofs_aops;
 172
 173 /* namei.c           */
 174 extern const struct inode_operations exofs_dir_inode_operations;
 175 extern const struct inode_operations exofs_special_inode_operations;
 176
 177 /* symlink.c         */
 178 extern const struct inode_operations exofs_symlink_inode_operations;
 179 extern const struct inode_operations exofs_fast_symlink_inode_operations;
 180
 181 #endif