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1 | /* |
2 | * Copyright (C) 2005, 2006 | |
27d2e149 | 3 | * Avishay Traeger (avishay@gmail.com) |
b14f8ab2 BH |
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 | */ | |
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33 | #ifndef __EXOFS_H__ |
34 | #define __EXOFS_H__ | |
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35 | |
36 | #include <linux/fs.h> | |
37 | #include <linux/time.h> | |
b3d0ab7e | 38 | #include <linux/backing-dev.h> |
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39 | #include "common.h" |
40 | ||
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41 | /* FIXME: Remove once pnfs hits mainline |
42 | * #include <linux/exportfs/pnfs_osd_xdr.h> | |
43 | */ | |
44 | #include "pnfs.h" | |
45 | ||
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46 | #define EXOFS_ERR(fmt, a...) printk(KERN_ERR "exofs: " fmt, ##a) |
47 | ||
48 | #ifdef CONFIG_EXOFS_DEBUG | |
49 | #define EXOFS_DBGMSG(fmt, a...) \ | |
50 | printk(KERN_NOTICE "exofs @%s:%d: " fmt, __func__, __LINE__, ##a) | |
51 | #else | |
52 | #define EXOFS_DBGMSG(fmt, a...) \ | |
53 | do { if (0) printk(fmt, ##a); } while (0) | |
54 | #endif | |
55 | ||
56 | /* u64 has problems with printk this will cast it to unsigned long long */ | |
57 | #define _LLU(x) (unsigned long long)(x) | |
58 | ||
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59 | struct exofs_layout { |
60 | osd_id s_pid; /* partition ID of file system*/ | |
61 | ||
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62 | /* Our way of looking at the data_map */ |
63 | unsigned stripe_unit; | |
64 | unsigned mirrors_p1; | |
65 | ||
66 | unsigned group_width; | |
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67 | u64 group_depth; |
68 | unsigned group_count; | |
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69 | |
70 | enum exofs_inode_layout_gen_functions lay_func; | |
71 | ||
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72 | unsigned s_numdevs; /* Num of devices in array */ |
73 | struct osd_dev *s_ods[0]; /* Variable length */ | |
74 | }; | |
75 | ||
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76 | /* |
77 | * our extension to the in-memory superblock | |
78 | */ | |
79 | struct exofs_sb_info { | |
06886a5a | 80 | struct exofs_fscb s_fscb; /* Written often, pre-allocate*/ |
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81 | int s_timeout; /* timeout for OSD operations */ |
82 | uint64_t s_nextid; /* highest object ID used */ | |
83 | uint32_t s_numfiles; /* number of files on fs */ | |
84 | spinlock_t s_next_gen_lock; /* spinlock for gen # update */ | |
85 | u32 s_next_generation; /* next gen # to use */ | |
86 | atomic_t s_curr_pending; /* number of pending commands */ | |
04dc1e88 | 87 | uint8_t s_cred[OSD_CAP_LEN]; /* credential for the fscb */ |
a36fed12 | 88 | struct backing_dev_info bdi; /* register our bdi with VFS */ |
04dc1e88 | 89 | |
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90 | struct pnfs_osd_data_map data_map; /* Default raid to use |
91 | * FIXME: Needed ? | |
92 | */ | |
93 | /* struct exofs_layout dir_layout;*/ /* Default dir layout */ | |
94 | struct exofs_layout layout; /* Default files layout, | |
95 | * contains the variable osd_dev | |
96 | * array. Keep last */ | |
97 | struct osd_dev *_min_one_dev[1]; /* Place holder for one dev */ | |
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98 | }; |
99 | ||
100 | /* | |
101 | * our extension to the in-memory inode | |
102 | */ | |
103 | struct exofs_i_info { | |
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104 | struct inode vfs_inode; /* normal in-memory inode */ |
105 | wait_queue_head_t i_wq; /* wait queue for inode */ | |
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106 | unsigned long i_flags; /* various atomic flags */ |
107 | uint32_t i_data[EXOFS_IDATA];/*short symlink names and device #s*/ | |
108 | uint32_t i_dir_start_lookup; /* which page to start lookup */ | |
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109 | uint64_t i_commit_size; /* the object's written length */ |
110 | uint8_t i_cred[OSD_CAP_LEN];/* all-powerful credential */ | |
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111 | }; |
112 | ||
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113 | static inline osd_id exofs_oi_objno(struct exofs_i_info *oi) |
114 | { | |
115 | return oi->vfs_inode.i_ino + EXOFS_OBJ_OFF; | |
116 | } | |
117 | ||
118 | struct exofs_io_state; | |
119 | typedef void (*exofs_io_done_fn)(struct exofs_io_state *or, void *private); | |
120 | ||
121 | struct exofs_io_state { | |
122 | struct kref kref; | |
123 | ||
124 | void *private; | |
125 | exofs_io_done_fn done; | |
126 | ||
45d3abcb | 127 | struct exofs_layout *layout; |
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128 | struct osd_obj_id obj; |
129 | u8 *cred; | |
130 | ||
131 | /* Global read/write IO*/ | |
132 | loff_t offset; | |
133 | unsigned long length; | |
134 | void *kern_buff; | |
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135 | |
136 | struct page **pages; | |
137 | unsigned nr_pages; | |
138 | unsigned pgbase; | |
50a76fd3 | 139 | unsigned pages_consumed; |
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140 | |
141 | /* Attributes */ | |
142 | unsigned in_attr_len; | |
143 | struct osd_attr *in_attr; | |
144 | unsigned out_attr_len; | |
145 | struct osd_attr *out_attr; | |
146 | ||
147 | /* Variable array of size numdevs */ | |
148 | unsigned numdevs; | |
149 | struct exofs_per_dev_state { | |
150 | struct osd_request *or; | |
151 | struct bio *bio; | |
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152 | loff_t offset; |
153 | unsigned length; | |
154 | unsigned dev; | |
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155 | } per_dev[]; |
156 | }; | |
157 | ||
158 | static inline unsigned exofs_io_state_size(unsigned numdevs) | |
159 | { | |
160 | return sizeof(struct exofs_io_state) + | |
161 | sizeof(struct exofs_per_dev_state) * numdevs; | |
162 | } | |
163 | ||
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164 | /* |
165 | * our inode flags | |
166 | */ | |
167 | #define OBJ_2BCREATED 0 /* object will be created soon*/ | |
168 | #define OBJ_CREATED 1 /* object has been created on the osd*/ | |
169 | ||
170 | static inline int obj_2bcreated(struct exofs_i_info *oi) | |
171 | { | |
172 | return test_bit(OBJ_2BCREATED, &oi->i_flags); | |
173 | } | |
174 | ||
175 | static inline void set_obj_2bcreated(struct exofs_i_info *oi) | |
176 | { | |
177 | set_bit(OBJ_2BCREATED, &oi->i_flags); | |
178 | } | |
179 | ||
180 | static inline int obj_created(struct exofs_i_info *oi) | |
181 | { | |
182 | return test_bit(OBJ_CREATED, &oi->i_flags); | |
183 | } | |
184 | ||
185 | static inline void set_obj_created(struct exofs_i_info *oi) | |
186 | { | |
187 | set_bit(OBJ_CREATED, &oi->i_flags); | |
188 | } | |
189 | ||
190 | int __exofs_wait_obj_created(struct exofs_i_info *oi); | |
191 | static inline int wait_obj_created(struct exofs_i_info *oi) | |
192 | { | |
193 | if (likely(obj_created(oi))) | |
194 | return 0; | |
195 | ||
196 | return __exofs_wait_obj_created(oi); | |
197 | } | |
198 | ||
199 | /* | |
200 | * get to our inode from the vfs inode | |
201 | */ | |
202 | static inline struct exofs_i_info *exofs_i(struct inode *inode) | |
203 | { | |
204 | return container_of(inode, struct exofs_i_info, vfs_inode); | |
205 | } | |
206 | ||
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207 | /* |
208 | * Given a layout, object_number and stripe_index return the associated global | |
209 | * dev_index | |
210 | */ | |
211 | unsigned exofs_layout_od_id(struct exofs_layout *layout, | |
212 | osd_id obj_no, unsigned layout_index); | |
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213 | /* |
214 | * Maximum count of links to a file | |
215 | */ | |
216 | #define EXOFS_LINK_MAX 32000 | |
217 | ||
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218 | /************************* |
219 | * function declarations * | |
220 | *************************/ | |
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221 | |
222 | /* ios.c */ | |
223 | void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], | |
224 | const struct osd_obj_id *obj); | |
225 | int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj, | |
226 | u64 offset, void *p, unsigned length); | |
227 | ||
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228 | int exofs_get_io_state(struct exofs_layout *layout, |
229 | struct exofs_io_state **ios); | |
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230 | void exofs_put_io_state(struct exofs_io_state *ios); |
231 | ||
232 | int exofs_check_io(struct exofs_io_state *ios, u64 *resid); | |
233 | ||
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); | |
238 | ||
239 | int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr); | |
240 | ||
241 | int exofs_oi_truncate(struct exofs_i_info *oi, u64 new_len); | |
242 | static inline int exofs_oi_write(struct exofs_i_info *oi, | |
243 | struct exofs_io_state *ios) | |
244 | { | |
245 | ios->obj.id = exofs_oi_objno(oi); | |
246 | ios->cred = oi->i_cred; | |
247 | return exofs_sbi_write(ios); | |
248 | } | |
249 | ||
250 | static inline int exofs_oi_read(struct exofs_i_info *oi, | |
251 | struct exofs_io_state *ios) | |
252 | { | |
253 | ios->obj.id = exofs_oi_objno(oi); | |
254 | ios->cred = oi->i_cred; | |
255 | return exofs_sbi_read(ios); | |
256 | } | |
257 | ||
e8062719 | 258 | /* inode.c */ |
e8062719 | 259 | int exofs_setattr(struct dentry *, struct iattr *); |
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260 | int exofs_write_begin(struct file *file, struct address_space *mapping, |
261 | loff_t pos, unsigned len, unsigned flags, | |
262 | struct page **pagep, void **fsdata); | |
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263 | extern struct inode *exofs_iget(struct super_block *, unsigned long); |
264 | struct inode *exofs_new_inode(struct inode *, int); | |
a9185b41 | 265 | extern int exofs_write_inode(struct inode *, struct writeback_control *wbc); |
4ec70c9b | 266 | extern void exofs_evict_inode(struct inode *); |
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267 | |
268 | /* dir.c: */ | |
269 | int exofs_add_link(struct dentry *, struct inode *); | |
270 | ino_t exofs_inode_by_name(struct inode *, struct dentry *); | |
271 | int exofs_delete_entry(struct exofs_dir_entry *, struct page *); | |
272 | int exofs_make_empty(struct inode *, struct inode *); | |
273 | struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *, | |
274 | struct page **); | |
275 | int exofs_empty_dir(struct inode *); | |
276 | struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **); | |
8cf74b39 | 277 | ino_t exofs_parent_ino(struct dentry *child); |
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278 | int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *, |
279 | struct inode *); | |
e8062719 | 280 | |
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281 | /* super.c */ |
282 | int exofs_sync_fs(struct super_block *sb, int wait); | |
283 | ||
e8062719 BH |
284 | /********************* |
285 | * operation vectors * | |
286 | *********************/ | |
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287 | /* dir.c: */ |
288 | extern const struct file_operations exofs_dir_operations; | |
289 | ||
e8062719 BH |
290 | /* file.c */ |
291 | extern const struct inode_operations exofs_file_inode_operations; | |
292 | extern const struct file_operations exofs_file_operations; | |
293 | ||
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294 | /* inode.c */ |
295 | extern const struct address_space_operations exofs_aops; | |
06886a5a | 296 | extern const struct osd_attr g_attr_logical_length; |
beaec07b | 297 | |
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298 | /* namei.c */ |
299 | extern const struct inode_operations exofs_dir_inode_operations; | |
300 | extern const struct inode_operations exofs_special_inode_operations; | |
301 | ||
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302 | /* symlink.c */ |
303 | extern const struct inode_operations exofs_symlink_inode_operations; | |
304 | extern const struct inode_operations exofs_fast_symlink_inode_operations; | |
305 | ||
b14f8ab2 | 306 | #endif |