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#ifndef __EXOFS_H__ 34#define __EXOFS_H__ 35 36#include <linux/fs.h> 37#include <linux/time.h> 38#include <linux/backing-dev.h> 39#include "common.h" 40 41#include "pnfs.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 56struct exofs_layout { 57 osd_id s_pid; /* partition ID of file system*/ 58 59 /* Our way of looking at the data_map */ 60 unsigned stripe_unit; 61 unsigned mirrors_p1; 62 63 unsigned group_width; 64 u64 group_depth; 65 unsigned group_count; 66 67 enum exofs_inode_layout_gen_functions lay_func; 68 69 unsigned s_numdevs; /* Num of devices in array */ 70 struct osd_dev *s_ods[0]; /* Variable length */ 71}; 72 73/* 74 * our extension to the in-memory superblock 75 */ 76struct exofs_sb_info { 77 struct exofs_fscb s_fscb; /* Written often, pre-allocate*/ 78 int s_timeout; /* timeout for OSD operations */ 79 uint64_t s_nextid; /* highest object ID used */ 80 uint32_t s_numfiles; /* number of files on fs */ 81 spinlock_t s_next_gen_lock; /* spinlock for gen # update */ 82 u32 s_next_generation; /* next gen # to use */ 83 atomic_t s_curr_pending; /* number of pending commands */ 84 uint8_t s_cred[OSD_CAP_LEN]; /* credential for the fscb */ 85 struct backing_dev_info bdi; /* register our bdi with VFS */ 86 87 struct pnfs_osd_data_map data_map; 88/* struct exofs_layout dir_layout;*/ /* Default dir layout */ 89 struct exofs_layout layout; /* Default files layout, 90 * contains the variable osd_dev 91 * array. Keep last */ 92 struct osd_dev *_min_one_dev[1]; /* Place holder for one dev */ 93}; 94 95/* 96 * our extension to the in-memory inode 97 */ 98struct exofs_i_info { 99 struct inode vfs_inode; /* normal in-memory inode */ 100 wait_queue_head_t i_wq; /* wait queue for inode */ 101 unsigned long i_flags; /* various atomic flags */ 102 uint32_t i_data[EXOFS_IDATA];/*short symlink names and device #s*/ 103 uint32_t i_dir_start_lookup; /* which page to start lookup */ 104 uint64_t i_commit_size; /* the object's written length */ 105 uint8_t i_cred[OSD_CAP_LEN];/* all-powerful credential */ 106}; 107 108static inline osd_id exofs_oi_objno(struct exofs_i_info *oi) 109{ 110 return oi->vfs_inode.i_ino + EXOFS_OBJ_OFF; 111} 112 113struct exofs_io_state; 114typedef void (*exofs_io_done_fn)(struct exofs_io_state *or, void *private); 115 116struct exofs_io_state { 117 struct kref kref; 118 119 void *private; 120 exofs_io_done_fn done; 121 122 struct exofs_layout *layout; 123 struct osd_obj_id obj; 124 u8 *cred; 125 126 /* Global read/write IO*/ 127 loff_t offset; 128 unsigned long length; 129 void *kern_buff; 130 131 struct page **pages; 132 unsigned nr_pages; 133 unsigned pgbase; 134 unsigned pages_consumed; 135 136 /* Attributes */ 137 unsigned in_attr_len; 138 struct osd_attr *in_attr; 139 unsigned out_attr_len; 140 struct osd_attr *out_attr; 141 142 /* Variable array of size numdevs */ 143 unsigned numdevs; 144 struct exofs_per_dev_state { 145 struct osd_request *or; 146 struct bio *bio; 147 loff_t offset; 148 unsigned length; 149 unsigned dev; 150 } per_dev[]; 151}; 152 153static inline unsigned exofs_io_state_size(unsigned numdevs) 154{ 155 return sizeof(struct exofs_io_state) + 156 sizeof(struct exofs_per_dev_state) * numdevs; 157} 158 159/* 160 * our inode flags 161 */ 162#define OBJ_2BCREATED 0 /* object will be created soon*/ 163#define OBJ_CREATED 1 /* object has been created on the osd*/ 164 165static inline int obj_2bcreated(struct exofs_i_info *oi) 166{ 167 return test_bit(OBJ_2BCREATED, &oi->i_flags); 168} 169 170static inline void set_obj_2bcreated(struct exofs_i_info *oi) 171{ 172 set_bit(OBJ_2BCREATED, &oi->i_flags); 173} 174 175static inline int obj_created(struct exofs_i_info *oi) 176{ 177 return test_bit(OBJ_CREATED, &oi->i_flags); 178} 179 180static inline void set_obj_created(struct exofs_i_info *oi) 181{ 182 set_bit(OBJ_CREATED, &oi->i_flags); 183} 184 185int __exofs_wait_obj_created(struct exofs_i_info *oi); 186static inline int wait_obj_created(struct exofs_i_info *oi) 187{ 188 if (likely(obj_created(oi))) 189 return 0; 190 191 return __exofs_wait_obj_created(oi); 192} 193 194/* 195 * get to our inode from the vfs inode 196 */ 197static inline struct exofs_i_info *exofs_i(struct inode *inode) 198{ 199 return container_of(inode, struct exofs_i_info, vfs_inode); 200} 201 202/* 203 * Given a layout, object_number and stripe_index return the associated global 204 * dev_index 205 */ 206unsigned exofs_layout_od_id(struct exofs_layout *layout, 207 osd_id obj_no, unsigned layout_index); 208/* 209 * Maximum count of links to a file 210 */ 211#define EXOFS_LINK_MAX 32000 212 213/************************* 214 * function declarations * 215 *************************/ 216 217/* ios.c */ 218void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], 219 const struct osd_obj_id *obj); 220int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj, 221 u64 offset, void *p, unsigned length); 222 223int exofs_get_io_state(struct exofs_layout *layout, 224 struct exofs_io_state **ios); 225void exofs_put_io_state(struct exofs_io_state *ios); 226 227int exofs_check_io(struct exofs_io_state *ios, u64 *resid); 228 229int exofs_sbi_create(struct exofs_io_state *ios); 230int exofs_sbi_remove(struct exofs_io_state *ios); 231int exofs_sbi_write(struct exofs_io_state *ios); 232int exofs_sbi_read(struct exofs_io_state *ios); 233 234int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr); 235 236int exofs_oi_truncate(struct exofs_i_info *oi, u64 new_len); 237static inline int exofs_oi_write(struct exofs_i_info *oi, 238 struct exofs_io_state *ios) 239{ 240 ios->obj.id = exofs_oi_objno(oi); 241 ios->cred = oi->i_cred; 242 return exofs_sbi_write(ios); 243} 244 245static inline int exofs_oi_read(struct exofs_i_info *oi, 246 struct exofs_io_state *ios) 247{ 248 ios->obj.id = exofs_oi_objno(oi); 249 ios->cred = oi->i_cred; 250 return exofs_sbi_read(ios); 251} 252 253/* inode.c */ 254int exofs_setattr(struct dentry *, struct iattr *); 255int exofs_write_begin(struct file *file, struct address_space *mapping, 256 loff_t pos, unsigned len, unsigned flags, 257 struct page **pagep, void **fsdata); 258extern struct inode *exofs_iget(struct super_block *, unsigned long); 259struct inode *exofs_new_inode(struct inode *, int); 260extern int exofs_write_inode(struct inode *, struct writeback_control *wbc); 261extern void exofs_evict_inode(struct inode *); 262 263/* dir.c: */ 264int exofs_add_link(struct dentry *, struct inode *); 265ino_t exofs_inode_by_name(struct inode *, struct dentry *); 266int exofs_delete_entry(struct exofs_dir_entry *, struct page *); 267int exofs_make_empty(struct inode *, struct inode *); 268struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *, 269 struct page **); 270int exofs_empty_dir(struct inode *); 271struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **); 272ino_t exofs_parent_ino(struct dentry *child); 273int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *, 274 struct inode *); 275 276/* super.c */ 277int exofs_sync_fs(struct super_block *sb, int wait); 278 279/********************* 280 * operation vectors * 281 *********************/ 282/* dir.c: */ 283extern const struct file_operations exofs_dir_operations; 284 285/* file.c */ 286extern const struct inode_operations exofs_file_inode_operations; 287extern const struct file_operations exofs_file_operations; 288 289/* inode.c */ 290extern const struct address_space_operations exofs_aops; 291extern const struct osd_attr g_attr_logical_length; 292 293/* namei.c */ 294extern const struct inode_operations exofs_dir_inode_operations; 295extern const struct inode_operations exofs_special_inode_operations; 296 297/* symlink.c */ 298extern const struct inode_operations exofs_symlink_inode_operations; 299extern const struct inode_operations exofs_fast_symlink_inode_operations; 300 301#endif 302