1/* 2 * Copyright (C) 2005, 2006 3 * Avishay Traeger (avishay@gmail.com) 4 * Copyright (C) 2008, 2009 5 * Boaz Harrosh <ooo@electrozaur.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 <scsi/osd_ore.h> 40 41#include "common.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_dev { 57 struct ore_dev ored; 58 unsigned did; 59 unsigned urilen; 60 uint8_t *uri; 61 struct kobject ed_kobj; 62}; 63/* 64 * our extension to the in-memory superblock 65 */ 66struct exofs_sb_info { 67 struct backing_dev_info bdi; /* register our bdi with VFS */ 68 struct exofs_sb_stats s_ess; /* Written often, pre-allocate*/ 69 int s_timeout; /* timeout for OSD operations */ 70 uint64_t s_nextid; /* highest object ID used */ 71 uint32_t s_numfiles; /* number of files on fs */ 72 spinlock_t s_next_gen_lock; /* spinlock for gen # update */ 73 u32 s_next_generation; /* next gen # to use */ 74 atomic_t s_curr_pending; /* number of pending commands */ 75 76 struct ore_layout layout; /* Default files layout */ 77 struct ore_comp one_comp; /* id & cred of partition id=0*/ 78 struct ore_components oc; /* comps for the partition */ 79 struct kobject s_kobj; /* holds per-sbi kobject */ 80}; 81 82/* 83 * our extension to the in-memory inode 84 */ 85struct exofs_i_info { 86 struct inode vfs_inode; /* normal in-memory inode */ 87 wait_queue_head_t i_wq; /* wait queue for inode */ 88 unsigned long i_flags; /* various atomic flags */ 89 uint32_t i_data[EXOFS_IDATA];/*short symlink names and device #s*/ 90 uint32_t i_dir_start_lookup; /* which page to start lookup */ 91 uint64_t i_commit_size; /* the object's written length */ 92 struct ore_comp one_comp; /* same component for all devices */ 93 struct ore_components oc; /* inode view of the device table */ 94}; 95 96static inline osd_id exofs_oi_objno(struct exofs_i_info *oi) 97{ 98 return oi->vfs_inode.i_ino + EXOFS_OBJ_OFF; 99} 100 101/* 102 * our inode flags 103 */ 104#define OBJ_2BCREATED 0 /* object will be created soon*/ 105#define OBJ_CREATED 1 /* object has been created on the osd*/ 106 107static inline int obj_2bcreated(struct exofs_i_info *oi) 108{ 109 return test_bit(OBJ_2BCREATED, &oi->i_flags); 110} 111 112static inline void set_obj_2bcreated(struct exofs_i_info *oi) 113{ 114 set_bit(OBJ_2BCREATED, &oi->i_flags); 115} 116 117static inline int obj_created(struct exofs_i_info *oi) 118{ 119 return test_bit(OBJ_CREATED, &oi->i_flags); 120} 121 122static inline void set_obj_created(struct exofs_i_info *oi) 123{ 124 set_bit(OBJ_CREATED, &oi->i_flags); 125} 126 127int __exofs_wait_obj_created(struct exofs_i_info *oi); 128static inline int wait_obj_created(struct exofs_i_info *oi) 129{ 130 if (likely(obj_created(oi))) 131 return 0; 132 133 return __exofs_wait_obj_created(oi); 134} 135 136/* 137 * get to our inode from the vfs inode 138 */ 139static inline struct exofs_i_info *exofs_i(struct inode *inode) 140{ 141 return container_of(inode, struct exofs_i_info, vfs_inode); 142} 143 144/* 145 * Maximum count of links to a file 146 */ 147#define EXOFS_LINK_MAX 32000 148 149/************************* 150 * function declarations * 151 *************************/ 152 153/* inode.c */ 154unsigned exofs_max_io_pages(struct ore_layout *layout, 155 unsigned expected_pages); 156int exofs_setattr(struct dentry *, struct iattr *); 157int exofs_write_begin(struct file *file, struct address_space *mapping, 158 loff_t pos, unsigned len, unsigned flags, 159 struct page **pagep, void **fsdata); 160extern struct inode *exofs_iget(struct super_block *, unsigned long); 161struct inode *exofs_new_inode(struct inode *, umode_t); 162extern int exofs_write_inode(struct inode *, struct writeback_control *wbc); 163extern void exofs_evict_inode(struct inode *); 164 165/* dir.c: */ 166int exofs_add_link(struct dentry *, struct inode *); 167ino_t exofs_inode_by_name(struct inode *, struct dentry *); 168int exofs_delete_entry(struct exofs_dir_entry *, struct page *); 169int exofs_make_empty(struct inode *, struct inode *); 170struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *, 171 struct page **); 172int exofs_empty_dir(struct inode *); 173struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **); 174ino_t exofs_parent_ino(struct dentry *child); 175int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *, 176 struct inode *); 177 178/* super.c */ 179void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], 180 const struct osd_obj_id *obj); 181int exofs_sbi_write_stats(struct exofs_sb_info *sbi); 182 183/* sys.c */ 184int exofs_sysfs_init(void); 185void exofs_sysfs_uninit(void); 186int exofs_sysfs_sb_add(struct exofs_sb_info *sbi, 187 struct exofs_dt_device_info *dt_dev); 188void exofs_sysfs_sb_del(struct exofs_sb_info *sbi); 189int exofs_sysfs_odev_add(struct exofs_dev *edev, 190 struct exofs_sb_info *sbi); 191void exofs_sysfs_dbg_print(void); 192 193/********************* 194 * operation vectors * 195 *********************/ 196/* dir.c: */ 197extern const struct file_operations exofs_dir_operations; 198 199/* file.c */ 200extern const struct inode_operations exofs_file_inode_operations; 201extern const struct file_operations exofs_file_operations; 202 203/* inode.c */ 204extern const struct address_space_operations exofs_aops; 205 206/* namei.c */ 207extern const struct inode_operations exofs_dir_inode_operations; 208extern const struct inode_operations exofs_special_inode_operations; 209 210/* symlink.c */ 211extern const struct inode_operations exofs_symlink_inode_operations; 212extern const struct inode_operations exofs_fast_symlink_inode_operations; 213 214/* exofs_init_comps will initialize an ore_components device array 215 * pointing to a single ore_comp struct, and a round-robin view 216 * of the device table. 217 * The first device of each inode is the [inode->ino % num_devices] 218 * and the rest of the devices sequentially following where the 219 * first device is after the last device. 220 * It is assumed that the global device array at @sbi is twice 221 * bigger and that the device table repeats twice. 222 * See: exofs_read_lookup_dev_table() 223 */ 224static inline void exofs_init_comps(struct ore_components *oc, 225 struct ore_comp *one_comp, 226 struct exofs_sb_info *sbi, osd_id oid) 227{ 228 unsigned dev_mod = (unsigned)oid, first_dev; 229 230 one_comp->obj.partition = sbi->one_comp.obj.partition; 231 one_comp->obj.id = oid; 232 exofs_make_credential(one_comp->cred, &one_comp->obj); 233 234 oc->first_dev = 0; 235 oc->numdevs = sbi->layout.group_width * sbi->layout.mirrors_p1 * 236 sbi->layout.group_count; 237 oc->single_comp = EC_SINGLE_COMP; 238 oc->comps = one_comp; 239 240 /* Round robin device view of the table */ 241 first_dev = (dev_mod * sbi->layout.mirrors_p1) % sbi->oc.numdevs; 242 oc->ods = &sbi->oc.ods[first_dev]; 243} 244 245#endif 246