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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> |
26ae93c2 | 39 | #include <linux/pnfs_osd_xdr.h> |
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40 | #include "common.h" |
41 | ||
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42 | #define EXOFS_ERR(fmt, a...) printk(KERN_ERR "exofs: " fmt, ##a) |
43 | ||
44 | #ifdef CONFIG_EXOFS_DEBUG | |
45 | #define EXOFS_DBGMSG(fmt, a...) \ | |
46 | printk(KERN_NOTICE "exofs @%s:%d: " fmt, __func__, __LINE__, ##a) | |
47 | #else | |
48 | #define EXOFS_DBGMSG(fmt, a...) \ | |
49 | do { if (0) printk(fmt, ##a); } while (0) | |
50 | #endif | |
51 | ||
52 | /* u64 has problems with printk this will cast it to unsigned long long */ | |
53 | #define _LLU(x) (unsigned long long)(x) | |
54 | ||
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55 | struct exofs_layout { |
56 | osd_id s_pid; /* partition ID of file system*/ | |
57 | ||
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58 | /* Our way of looking at the data_map */ |
59 | unsigned stripe_unit; | |
60 | unsigned mirrors_p1; | |
61 | ||
62 | unsigned group_width; | |
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63 | u64 group_depth; |
64 | unsigned group_count; | |
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65 | |
66 | enum exofs_inode_layout_gen_functions lay_func; | |
67 | ||
45d3abcb | 68 | unsigned s_numdevs; /* Num of devices in array */ |
6d4073e8 | 69 | struct osd_dev **s_ods; /* osd_dev array */ |
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70 | }; |
71 | ||
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72 | /* |
73 | * our extension to the in-memory superblock | |
74 | */ | |
75 | struct exofs_sb_info { | |
6d4073e8 | 76 | struct backing_dev_info bdi; /* register our bdi with VFS */ |
1cea312a | 77 | struct exofs_sb_stats s_ess; /* Written often, pre-allocate*/ |
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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 */ | |
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84 | uint8_t s_cred[OSD_CAP_LEN]; /* credential for the fscb */ |
85 | ||
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86 | struct pnfs_osd_data_map data_map; /* Default raid to use |
87 | * FIXME: Needed ? | |
88 | */ | |
6d4073e8 | 89 | struct exofs_layout layout; /* Default files layout */ |
45d3abcb | 90 | struct osd_dev *_min_one_dev[1]; /* Place holder for one dev */ |
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91 | }; |
92 | ||
93 | /* | |
94 | * our extension to the in-memory inode | |
95 | */ | |
96 | struct exofs_i_info { | |
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97 | struct inode vfs_inode; /* normal in-memory inode */ |
98 | wait_queue_head_t i_wq; /* wait queue for inode */ | |
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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 */ | |
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102 | uint64_t i_commit_size; /* the object's written length */ |
103 | uint8_t i_cred[OSD_CAP_LEN];/* all-powerful credential */ | |
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104 | }; |
105 | ||
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106 | static inline osd_id exofs_oi_objno(struct exofs_i_info *oi) |
107 | { | |
108 | return oi->vfs_inode.i_ino + EXOFS_OBJ_OFF; | |
109 | } | |
110 | ||
111 | struct exofs_io_state; | |
e1042ba0 | 112 | typedef void (*exofs_io_done_fn)(struct exofs_io_state *ios, void *private); |
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113 | |
114 | struct exofs_io_state { | |
115 | struct kref kref; | |
116 | ||
117 | void *private; | |
118 | exofs_io_done_fn done; | |
119 | ||
45d3abcb | 120 | struct exofs_layout *layout; |
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121 | struct osd_obj_id obj; |
122 | u8 *cred; | |
123 | ||
124 | /* Global read/write IO*/ | |
125 | loff_t offset; | |
126 | unsigned long length; | |
127 | void *kern_buff; | |
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128 | |
129 | struct page **pages; | |
130 | unsigned nr_pages; | |
131 | unsigned pgbase; | |
50a76fd3 | 132 | unsigned pages_consumed; |
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133 | |
134 | /* Attributes */ | |
135 | unsigned in_attr_len; | |
136 | struct osd_attr *in_attr; | |
137 | unsigned out_attr_len; | |
138 | struct osd_attr *out_attr; | |
139 | ||
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140 | bool reading; |
141 | ||
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142 | /* Variable array of size numdevs */ |
143 | unsigned numdevs; | |
144 | struct exofs_per_dev_state { | |
145 | struct osd_request *or; | |
146 | struct bio *bio; | |
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147 | loff_t offset; |
148 | unsigned length; | |
149 | unsigned dev; | |
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150 | } per_dev[]; |
151 | }; | |
152 | ||
153 | static 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 | ||
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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 | ||
165 | static inline int obj_2bcreated(struct exofs_i_info *oi) | |
166 | { | |
167 | return test_bit(OBJ_2BCREATED, &oi->i_flags); | |
168 | } | |
169 | ||
170 | static inline void set_obj_2bcreated(struct exofs_i_info *oi) | |
171 | { | |
172 | set_bit(OBJ_2BCREATED, &oi->i_flags); | |
173 | } | |
174 | ||
175 | static inline int obj_created(struct exofs_i_info *oi) | |
176 | { | |
177 | return test_bit(OBJ_CREATED, &oi->i_flags); | |
178 | } | |
179 | ||
180 | static inline void set_obj_created(struct exofs_i_info *oi) | |
181 | { | |
182 | set_bit(OBJ_CREATED, &oi->i_flags); | |
183 | } | |
184 | ||
185 | int __exofs_wait_obj_created(struct exofs_i_info *oi); | |
186 | static 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 | */ | |
197 | static inline struct exofs_i_info *exofs_i(struct inode *inode) | |
198 | { | |
199 | return container_of(inode, struct exofs_i_info, vfs_inode); | |
200 | } | |
201 | ||
d9c740d2 BH |
202 | /* |
203 | * Given a layout, object_number and stripe_index return the associated global | |
204 | * dev_index | |
205 | */ | |
206 | unsigned exofs_layout_od_id(struct exofs_layout *layout, | |
207 | osd_id obj_no, unsigned layout_index); | |
e6af00f1 BH |
208 | /* |
209 | * Maximum count of links to a file | |
210 | */ | |
211 | #define EXOFS_LINK_MAX 32000 | |
212 | ||
e8062719 BH |
213 | /************************* |
214 | * function declarations * | |
215 | *************************/ | |
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216 | |
217 | /* ios.c */ | |
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); | |
222 | ||
e1042ba0 BH |
223 | int exofs_get_rw_state(struct exofs_layout *layout, bool is_reading, |
224 | u64 offset, u64 length, struct exofs_io_state **ios); | |
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225 | int exofs_get_io_state(struct exofs_layout *layout, |
226 | struct exofs_io_state **ios); | |
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227 | void exofs_put_io_state(struct exofs_io_state *ios); |
228 | ||
229 | int exofs_check_io(struct exofs_io_state *ios, u64 *resid); | |
230 | ||
231 | int exofs_sbi_create(struct exofs_io_state *ios); | |
232 | int exofs_sbi_remove(struct exofs_io_state *ios); | |
233 | int exofs_sbi_write(struct exofs_io_state *ios); | |
234 | int exofs_sbi_read(struct exofs_io_state *ios); | |
235 | ||
236 | int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr); | |
237 | ||
238 | int exofs_oi_truncate(struct exofs_i_info *oi, u64 new_len); | |
239 | static inline int exofs_oi_write(struct exofs_i_info *oi, | |
240 | struct exofs_io_state *ios) | |
241 | { | |
242 | ios->obj.id = exofs_oi_objno(oi); | |
243 | ios->cred = oi->i_cred; | |
244 | return exofs_sbi_write(ios); | |
245 | } | |
246 | ||
247 | static inline int exofs_oi_read(struct exofs_i_info *oi, | |
248 | struct exofs_io_state *ios) | |
249 | { | |
250 | ios->obj.id = exofs_oi_objno(oi); | |
251 | ios->cred = oi->i_cred; | |
252 | return exofs_sbi_read(ios); | |
253 | } | |
254 | ||
e8062719 | 255 | /* inode.c */ |
66cd6cad | 256 | unsigned exofs_max_io_pages(struct exofs_layout *layout, |
257 | unsigned expected_pages); | |
e8062719 | 258 | int exofs_setattr(struct dentry *, struct iattr *); |
beaec07b BH |
259 | int exofs_write_begin(struct file *file, struct address_space *mapping, |
260 | loff_t pos, unsigned len, unsigned flags, | |
261 | struct page **pagep, void **fsdata); | |
e6af00f1 BH |
262 | extern struct inode *exofs_iget(struct super_block *, unsigned long); |
263 | struct inode *exofs_new_inode(struct inode *, int); | |
a9185b41 | 264 | extern int exofs_write_inode(struct inode *, struct writeback_control *wbc); |
4ec70c9b | 265 | extern void exofs_evict_inode(struct inode *); |
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266 | |
267 | /* dir.c: */ | |
268 | int exofs_add_link(struct dentry *, struct inode *); | |
269 | ino_t exofs_inode_by_name(struct inode *, struct dentry *); | |
270 | int exofs_delete_entry(struct exofs_dir_entry *, struct page *); | |
271 | int exofs_make_empty(struct inode *, struct inode *); | |
272 | struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *, | |
273 | struct page **); | |
274 | int exofs_empty_dir(struct inode *); | |
275 | struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **); | |
8cf74b39 | 276 | ino_t exofs_parent_ino(struct dentry *child); |
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277 | int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *, |
278 | struct inode *); | |
e8062719 | 279 | |
baaf94cd | 280 | /* super.c */ |
1cea312a | 281 | int exofs_sbi_write_stats(struct exofs_sb_info *sbi); |
baaf94cd | 282 | |
e8062719 BH |
283 | /********************* |
284 | * operation vectors * | |
285 | *********************/ | |
e6af00f1 BH |
286 | /* dir.c: */ |
287 | extern const struct file_operations exofs_dir_operations; | |
288 | ||
e8062719 BH |
289 | /* file.c */ |
290 | extern const struct inode_operations exofs_file_inode_operations; | |
291 | extern const struct file_operations exofs_file_operations; | |
292 | ||
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293 | /* inode.c */ |
294 | extern const struct address_space_operations exofs_aops; | |
06886a5a | 295 | extern const struct osd_attr g_attr_logical_length; |
beaec07b | 296 | |
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297 | /* namei.c */ |
298 | extern const struct inode_operations exofs_dir_inode_operations; | |
299 | extern const struct inode_operations exofs_special_inode_operations; | |
300 | ||
982980d7 BH |
301 | /* symlink.c */ |
302 | extern const struct inode_operations exofs_symlink_inode_operations; | |
303 | extern const struct inode_operations exofs_fast_symlink_inode_operations; | |
304 | ||
b14f8ab2 | 305 | #endif |