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>
38 #include <linux/backing-dev.h>
39 #include <linux/pnfs_osd_xdr.h>
42 #define EXOFS_ERR(fmt, a...) printk(KERN_ERR "exofs: " fmt, ##a)
44 #ifdef CONFIG_EXOFS_DEBUG
45 #define EXOFS_DBGMSG(fmt, a...) \
46 printk(KERN_NOTICE "exofs @%s:%d: " fmt, __func__, __LINE__, ##a)
48 #define EXOFS_DBGMSG(fmt, a...) \
49 do { if (0) printk(fmt, ##a); } while (0)
52 /* u64 has problems with printk this will cast it to unsigned long long */
53 #define _LLU(x) (unsigned long long)(x)
56 osd_id s_pid
; /* partition ID of file system*/
58 /* Our way of looking at the data_map */
66 enum exofs_inode_layout_gen_functions lay_func
;
68 unsigned s_numdevs
; /* Num of devices in array */
69 struct osd_dev
**s_ods
; /* osd_dev array */
73 * our extension to the in-memory superblock
75 struct exofs_sb_info
{
76 struct backing_dev_info bdi
; /* register our bdi with VFS */
77 struct exofs_sb_stats s_ess
; /* 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 layout
; /* Default files layout */
90 struct osd_dev
*_min_one_dev
[1]; /* Place holder for one dev */
94 * our extension to the in-memory inode
97 struct inode vfs_inode
; /* normal in-memory inode */
98 wait_queue_head_t i_wq
; /* wait queue for inode */
99 unsigned long i_flags
; /* various atomic flags */
100 uint32_t i_data
[EXOFS_IDATA
];/*short symlink names and device #s*/
101 uint32_t i_dir_start_lookup
; /* which page to start lookup */
102 uint64_t i_commit_size
; /* the object's written length */
103 uint8_t i_cred
[OSD_CAP_LEN
];/* all-powerful credential */
106 static inline osd_id
exofs_oi_objno(struct exofs_i_info
*oi
)
108 return oi
->vfs_inode
.i_ino
+ EXOFS_OBJ_OFF
;
111 struct exofs_io_state
;
112 typedef void (*exofs_io_done_fn
)(struct exofs_io_state
*ios
, void *private);
114 struct exofs_io_state
{
118 exofs_io_done_fn done
;
120 struct exofs_layout
*layout
;
121 struct osd_obj_id obj
;
124 /* Global read/write IO*/
126 unsigned long length
;
132 unsigned pages_consumed
;
135 unsigned in_attr_len
;
136 struct osd_attr
*in_attr
;
137 unsigned out_attr_len
;
138 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 static inline struct osd_dev
*exofs_ios_od(struct exofs_io_state
*ios
,
210 unsigned layout_index
)
212 return ios
->layout
->s_ods
[
213 exofs_layout_od_id(ios
->layout
, ios
->obj
.id
, layout_index
)];
217 * Maximum count of links to a file
219 #define EXOFS_LINK_MAX 32000
221 /*************************
222 * function declarations *
223 *************************/
226 int exofs_get_rw_state(struct exofs_layout
*layout
, bool is_reading
,
227 u64 offset
, u64 length
, struct exofs_io_state
**ios
);
228 int exofs_get_io_state(struct exofs_layout
*layout
,
229 struct exofs_io_state
**ios
);
230 void exofs_put_io_state(struct exofs_io_state
*ios
);
232 int exofs_check_io(struct exofs_io_state
*ios
, u64
*resid
);
234 int exofs_sbi_create(struct exofs_io_state
*ios
);
235 int exofs_sbi_remove(struct exofs_io_state
*ios
);
236 int exofs_sbi_write(struct exofs_io_state
*ios
);
237 int exofs_sbi_read(struct exofs_io_state
*ios
);
239 int extract_attr_from_ios(struct exofs_io_state
*ios
, struct osd_attr
*attr
);
240 extern const struct osd_attr g_attr_logical_length
;
242 int exofs_oi_truncate(struct exofs_i_info
*oi
, u64 new_len
);
243 static inline int exofs_oi_write(struct exofs_i_info
*oi
,
244 struct exofs_io_state
*ios
)
246 ios
->obj
.id
= exofs_oi_objno(oi
);
247 ios
->cred
= oi
->i_cred
;
248 return exofs_sbi_write(ios
);
251 static inline int exofs_oi_read(struct exofs_i_info
*oi
,
252 struct exofs_io_state
*ios
)
254 ios
->obj
.id
= exofs_oi_objno(oi
);
255 ios
->cred
= oi
->i_cred
;
256 return exofs_sbi_read(ios
);
260 unsigned exofs_max_io_pages(struct exofs_layout
*layout
,
261 unsigned expected_pages
);
262 int exofs_setattr(struct dentry
*, struct iattr
*);
263 int exofs_write_begin(struct file
*file
, struct address_space
*mapping
,
264 loff_t pos
, unsigned len
, unsigned flags
,
265 struct page
**pagep
, void **fsdata
);
266 extern struct inode
*exofs_iget(struct super_block
*, unsigned long);
267 struct inode
*exofs_new_inode(struct inode
*, int);
268 extern int exofs_write_inode(struct inode
*, struct writeback_control
*wbc
);
269 extern void exofs_evict_inode(struct inode
*);
272 int exofs_add_link(struct dentry
*, struct inode
*);
273 ino_t
exofs_inode_by_name(struct inode
*, struct dentry
*);
274 int exofs_delete_entry(struct exofs_dir_entry
*, struct page
*);
275 int exofs_make_empty(struct inode
*, struct inode
*);
276 struct exofs_dir_entry
*exofs_find_entry(struct inode
*, struct dentry
*,
278 int exofs_empty_dir(struct inode
*);
279 struct exofs_dir_entry
*exofs_dotdot(struct inode
*, struct page
**);
280 ino_t
exofs_parent_ino(struct dentry
*child
);
281 int exofs_set_link(struct inode
*, struct exofs_dir_entry
*, struct page
*,
285 void exofs_make_credential(u8 cred_a
[OSD_CAP_LEN
],
286 const struct osd_obj_id
*obj
);
287 int exofs_sbi_write_stats(struct exofs_sb_info
*sbi
);
289 /*********************
290 * operation vectors *
291 *********************/
293 extern const struct file_operations exofs_dir_operations
;
296 extern const struct inode_operations exofs_file_inode_operations
;
297 extern const struct file_operations exofs_file_operations
;
300 extern const struct address_space_operations exofs_aops
;
303 extern const struct inode_operations exofs_dir_inode_operations
;
304 extern const struct inode_operations exofs_special_inode_operations
;
307 extern const struct inode_operations exofs_symlink_inode_operations
;
308 extern const struct inode_operations exofs_fast_symlink_inode_operations
;