2 * Copyright (C) 2005, 2006
3 * Avishay Traeger (avishay@gmail.com)
4 * Copyright (C) 2008, 2009
5 * Boaz Harrosh <bharrosh@panasas.com>
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)
13 * linux/fs/minix/inode.c
14 * Copyright (C) 1991, 1992 Linus Torvalds
16 * This file is part of exofs.
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.
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.
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
37 #include <linux/time.h>
40 /* FIXME: Remove once pnfs hits mainline
41 * #include <linux/exportfs/pnfs_osd_xdr.h>
45 #define EXOFS_ERR(fmt, a...) printk(KERN_ERR "exofs: " fmt, ##a)
47 #ifdef CONFIG_EXOFS_DEBUG
48 #define EXOFS_DBGMSG(fmt, a...) \
49 printk(KERN_NOTICE "exofs @%s:%d: " fmt, __func__, __LINE__, ##a)
51 #define EXOFS_DBGMSG(fmt, a...) \
52 do { if (0) printk(fmt, ##a); } while (0)
55 /* u64 has problems with printk this will cast it to unsigned long long */
56 #define _LLU(x) (unsigned long long)(x)
59 osd_id s_pid; /* partition ID of file system*/
61 /* Our way of looking at the data_map */
67 enum exofs_inode_layout_gen_functions lay_func;
69 unsigned s_numdevs; /* Num of devices in array */
70 struct osd_dev *s_ods[0]; /* Variable length */
74 * our extension to the in-memory superblock
76 struct 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 */
86 struct pnfs_osd_data_map data_map; /* Default raid to use
89 /* struct exofs_layout dir_layout;*/ /* Default dir layout */
90 struct exofs_layout layout; /* Default files layout,
91 * contains the variable osd_dev
93 struct osd_dev *_min_one_dev[1]; /* Place holder for one dev */
97 * our extension to the in-memory inode
100 struct inode vfs_inode; /* normal in-memory inode */
101 wait_queue_head_t i_wq; /* wait queue for inode */
102 unsigned long i_flags; /* various atomic flags */
103 uint32_t i_data[EXOFS_IDATA];/*short symlink names and device #s*/
104 uint32_t i_dir_start_lookup; /* which page to start lookup */
105 uint64_t i_commit_size; /* the object's written length */
106 uint8_t i_cred[OSD_CAP_LEN];/* all-powerful credential */
109 static inline osd_id exofs_oi_objno(struct exofs_i_info *oi)
111 return oi->vfs_inode.i_ino + EXOFS_OBJ_OFF;
114 struct exofs_io_state;
115 typedef void (*exofs_io_done_fn)(struct exofs_io_state *or, void *private);
117 struct exofs_io_state {
121 exofs_io_done_fn done;
123 struct exofs_layout *layout;
124 struct osd_obj_id obj;
127 /* Global read/write IO*/
129 unsigned long length;
137 unsigned in_attr_len;
138 struct osd_attr *in_attr;
139 unsigned out_attr_len;
140 struct osd_attr *out_attr;
142 /* Variable array of size numdevs */
144 struct exofs_per_dev_state {
145 struct osd_request *or;
153 static inline unsigned exofs_io_state_size(unsigned numdevs)
155 return sizeof(struct exofs_io_state) +
156 sizeof(struct exofs_per_dev_state) * numdevs;
162 #define OBJ_2BCREATED 0 /* object will be created soon*/
163 #define OBJ_CREATED 1 /* object has been created on the osd*/
165 static inline int obj_2bcreated(struct exofs_i_info *oi)
167 return test_bit(OBJ_2BCREATED, &oi->i_flags);
170 static inline void set_obj_2bcreated(struct exofs_i_info *oi)
172 set_bit(OBJ_2BCREATED, &oi->i_flags);
175 static inline int obj_created(struct exofs_i_info *oi)
177 return test_bit(OBJ_CREATED, &oi->i_flags);
180 static inline void set_obj_created(struct exofs_i_info *oi)
182 set_bit(OBJ_CREATED, &oi->i_flags);
185 int __exofs_wait_obj_created(struct exofs_i_info *oi);
186 static inline int wait_obj_created(struct exofs_i_info *oi)
188 if (likely(obj_created(oi)))
191 return __exofs_wait_obj_created(oi);
195 * get to our inode from the vfs inode
197 static inline struct exofs_i_info *exofs_i(struct inode *inode)
199 return container_of(inode, struct exofs_i_info, vfs_inode);
203 * Given a layout, object_number and stripe_index return the associated global
206 unsigned exofs_layout_od_id(struct exofs_layout *layout,
207 osd_id obj_no, unsigned layout_index);
209 * Maximum count of links to a file
211 #define EXOFS_LINK_MAX 32000
213 /*************************
214 * function declarations *
215 *************************/
218 void exofs_make_credential(u8 cred_a[OSD_CAP_LEN],
219 const struct osd_obj_id *obj);
220 int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj,
221 u64 offset, void *p, unsigned length);
223 int exofs_get_io_state(struct exofs_layout *layout,
224 struct exofs_io_state **ios);
225 void exofs_put_io_state(struct exofs_io_state *ios);
227 int exofs_check_io(struct exofs_io_state *ios, u64 *resid);
229 int exofs_sbi_create(struct exofs_io_state *ios);
230 int exofs_sbi_remove(struct exofs_io_state *ios);
231 int exofs_sbi_write(struct exofs_io_state *ios);
232 int exofs_sbi_read(struct exofs_io_state *ios);
234 int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr);
236 int exofs_oi_truncate(struct exofs_i_info *oi, u64 new_len);
237 static inline int exofs_oi_write(struct exofs_i_info *oi,
238 struct exofs_io_state *ios)
240 ios->obj.id = exofs_oi_objno(oi);
241 ios->cred = oi->i_cred;
242 return exofs_sbi_write(ios);
245 static inline int exofs_oi_read(struct exofs_i_info *oi,
246 struct exofs_io_state *ios)
248 ios->obj.id = exofs_oi_objno(oi);
249 ios->cred = oi->i_cred;
250 return exofs_sbi_read(ios);
254 void exofs_truncate(struct inode *inode);
255 int exofs_setattr(struct dentry *, struct iattr *);
256 int exofs_write_begin(struct file *file, struct address_space *mapping,
257 loff_t pos, unsigned len, unsigned flags,
258 struct page **pagep, void **fsdata);
259 extern struct inode *exofs_iget(struct super_block *, unsigned long);
260 struct inode *exofs_new_inode(struct inode *, int);
261 extern int exofs_write_inode(struct inode *, int);
262 extern void exofs_delete_inode(struct inode *);
265 int exofs_add_link(struct dentry *, struct inode *);
266 ino_t exofs_inode_by_name(struct inode *, struct dentry *);
267 int exofs_delete_entry(struct exofs_dir_entry *, struct page *);
268 int exofs_make_empty(struct inode *, struct inode *);
269 struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *,
271 int exofs_empty_dir(struct inode *);
272 struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **);
273 ino_t exofs_parent_ino(struct dentry *child);
274 int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *,
278 int exofs_sync_fs(struct super_block *sb, int wait);
280 /*********************
281 * operation vectors *
282 *********************/
284 extern const struct file_operations exofs_dir_operations;
287 extern const struct inode_operations exofs_file_inode_operations;
288 extern const struct file_operations exofs_file_operations;
291 extern const struct address_space_operations exofs_aops;
292 extern const struct osd_attr g_attr_logical_length;
295 extern const struct inode_operations exofs_dir_inode_operations;
296 extern const struct inode_operations exofs_special_inode_operations;
299 extern const struct inode_operations exofs_symlink_inode_operations;
300 extern const struct inode_operations exofs_fast_symlink_inode_operations;