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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> | |
38 | #include "common.h" | |
39 | ||
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40 | /* FIXME: Remove once pnfs hits mainline |
41 | * #include <linux/exportfs/pnfs_osd_xdr.h> | |
42 | */ | |
43 | #include "pnfs.h" | |
44 | ||
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45 | #define EXOFS_ERR(fmt, a...) printk(KERN_ERR "exofs: " fmt, ##a) |
46 | ||
47 | #ifdef CONFIG_EXOFS_DEBUG | |
48 | #define EXOFS_DBGMSG(fmt, a...) \ | |
49 | printk(KERN_NOTICE "exofs @%s:%d: " fmt, __func__, __LINE__, ##a) | |
50 | #else | |
51 | #define EXOFS_DBGMSG(fmt, a...) \ | |
52 | do { if (0) printk(fmt, ##a); } while (0) | |
53 | #endif | |
54 | ||
55 | /* u64 has problems with printk this will cast it to unsigned long long */ | |
56 | #define _LLU(x) (unsigned long long)(x) | |
57 | ||
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58 | struct exofs_layout { |
59 | osd_id s_pid; /* partition ID of file system*/ | |
60 | ||
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61 | /* Our way of looking at the data_map */ |
62 | unsigned stripe_unit; | |
63 | unsigned mirrors_p1; | |
64 | ||
65 | unsigned group_width; | |
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66 | u64 group_depth; |
67 | unsigned group_count; | |
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68 | |
69 | enum exofs_inode_layout_gen_functions lay_func; | |
70 | ||
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71 | unsigned s_numdevs; /* Num of devices in array */ |
72 | struct osd_dev *s_ods[0]; /* Variable length */ | |
73 | }; | |
74 | ||
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75 | /* |
76 | * our extension to the in-memory superblock | |
77 | */ | |
78 | struct exofs_sb_info { | |
06886a5a | 79 | struct exofs_fscb s_fscb; /* Written often, pre-allocate*/ |
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80 | int s_timeout; /* timeout for OSD operations */ |
81 | uint64_t s_nextid; /* highest object ID used */ | |
82 | uint32_t s_numfiles; /* number of files on fs */ | |
83 | spinlock_t s_next_gen_lock; /* spinlock for gen # update */ | |
84 | u32 s_next_generation; /* next gen # to use */ | |
85 | atomic_t s_curr_pending; /* number of pending commands */ | |
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86 | uint8_t s_cred[OSD_CAP_LEN]; /* credential for the fscb */ |
87 | ||
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88 | struct pnfs_osd_data_map data_map; /* Default raid to use |
89 | * FIXME: Needed ? | |
90 | */ | |
91 | /* struct exofs_layout dir_layout;*/ /* Default dir layout */ | |
92 | struct exofs_layout layout; /* Default files layout, | |
93 | * contains the variable osd_dev | |
94 | * array. Keep last */ | |
95 | struct osd_dev *_min_one_dev[1]; /* Place holder for one dev */ | |
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96 | }; |
97 | ||
98 | /* | |
99 | * our extension to the in-memory inode | |
100 | */ | |
101 | struct exofs_i_info { | |
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102 | struct inode vfs_inode; /* normal in-memory inode */ |
103 | wait_queue_head_t i_wq; /* wait queue for inode */ | |
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104 | unsigned long i_flags; /* various atomic flags */ |
105 | uint32_t i_data[EXOFS_IDATA];/*short symlink names and device #s*/ | |
106 | uint32_t i_dir_start_lookup; /* which page to start lookup */ | |
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107 | uint64_t i_commit_size; /* the object's written length */ |
108 | uint8_t i_cred[OSD_CAP_LEN];/* all-powerful credential */ | |
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109 | }; |
110 | ||
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111 | static inline osd_id exofs_oi_objno(struct exofs_i_info *oi) |
112 | { | |
113 | return oi->vfs_inode.i_ino + EXOFS_OBJ_OFF; | |
114 | } | |
115 | ||
116 | struct exofs_io_state; | |
117 | typedef void (*exofs_io_done_fn)(struct exofs_io_state *or, void *private); | |
118 | ||
119 | struct exofs_io_state { | |
120 | struct kref kref; | |
121 | ||
122 | void *private; | |
123 | exofs_io_done_fn done; | |
124 | ||
45d3abcb | 125 | struct exofs_layout *layout; |
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126 | struct osd_obj_id obj; |
127 | u8 *cred; | |
128 | ||
129 | /* Global read/write IO*/ | |
130 | loff_t offset; | |
131 | unsigned long length; | |
132 | void *kern_buff; | |
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133 | |
134 | struct page **pages; | |
135 | unsigned nr_pages; | |
136 | unsigned pgbase; | |
50a76fd3 | 137 | unsigned pages_consumed; |
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138 | |
139 | /* Attributes */ | |
140 | unsigned in_attr_len; | |
141 | struct osd_attr *in_attr; | |
142 | unsigned out_attr_len; | |
143 | struct osd_attr *out_attr; | |
144 | ||
145 | /* Variable array of size numdevs */ | |
146 | unsigned numdevs; | |
147 | struct exofs_per_dev_state { | |
148 | struct osd_request *or; | |
149 | struct bio *bio; | |
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150 | loff_t offset; |
151 | unsigned length; | |
152 | unsigned dev; | |
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153 | } per_dev[]; |
154 | }; | |
155 | ||
156 | static inline unsigned exofs_io_state_size(unsigned numdevs) | |
157 | { | |
158 | return sizeof(struct exofs_io_state) + | |
159 | sizeof(struct exofs_per_dev_state) * numdevs; | |
160 | } | |
161 | ||
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162 | /* |
163 | * our inode flags | |
164 | */ | |
165 | #define OBJ_2BCREATED 0 /* object will be created soon*/ | |
166 | #define OBJ_CREATED 1 /* object has been created on the osd*/ | |
167 | ||
168 | static inline int obj_2bcreated(struct exofs_i_info *oi) | |
169 | { | |
170 | return test_bit(OBJ_2BCREATED, &oi->i_flags); | |
171 | } | |
172 | ||
173 | static inline void set_obj_2bcreated(struct exofs_i_info *oi) | |
174 | { | |
175 | set_bit(OBJ_2BCREATED, &oi->i_flags); | |
176 | } | |
177 | ||
178 | static inline int obj_created(struct exofs_i_info *oi) | |
179 | { | |
180 | return test_bit(OBJ_CREATED, &oi->i_flags); | |
181 | } | |
182 | ||
183 | static inline void set_obj_created(struct exofs_i_info *oi) | |
184 | { | |
185 | set_bit(OBJ_CREATED, &oi->i_flags); | |
186 | } | |
187 | ||
188 | int __exofs_wait_obj_created(struct exofs_i_info *oi); | |
189 | static inline int wait_obj_created(struct exofs_i_info *oi) | |
190 | { | |
191 | if (likely(obj_created(oi))) | |
192 | return 0; | |
193 | ||
194 | return __exofs_wait_obj_created(oi); | |
195 | } | |
196 | ||
197 | /* | |
198 | * get to our inode from the vfs inode | |
199 | */ | |
200 | static inline struct exofs_i_info *exofs_i(struct inode *inode) | |
201 | { | |
202 | return container_of(inode, struct exofs_i_info, vfs_inode); | |
203 | } | |
204 | ||
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205 | /* |
206 | * Given a layout, object_number and stripe_index return the associated global | |
207 | * dev_index | |
208 | */ | |
209 | unsigned exofs_layout_od_id(struct exofs_layout *layout, | |
210 | osd_id obj_no, unsigned layout_index); | |
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211 | /* |
212 | * Maximum count of links to a file | |
213 | */ | |
214 | #define EXOFS_LINK_MAX 32000 | |
215 | ||
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216 | /************************* |
217 | * function declarations * | |
218 | *************************/ | |
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219 | |
220 | /* ios.c */ | |
221 | void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], | |
222 | const struct osd_obj_id *obj); | |
223 | int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj, | |
224 | u64 offset, void *p, unsigned length); | |
225 | ||
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226 | int exofs_get_io_state(struct exofs_layout *layout, |
227 | struct exofs_io_state **ios); | |
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228 | void exofs_put_io_state(struct exofs_io_state *ios); |
229 | ||
230 | int exofs_check_io(struct exofs_io_state *ios, u64 *resid); | |
231 | ||
232 | int exofs_sbi_create(struct exofs_io_state *ios); | |
233 | int exofs_sbi_remove(struct exofs_io_state *ios); | |
234 | int exofs_sbi_write(struct exofs_io_state *ios); | |
235 | int exofs_sbi_read(struct exofs_io_state *ios); | |
236 | ||
237 | int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr); | |
238 | ||
239 | int exofs_oi_truncate(struct exofs_i_info *oi, u64 new_len); | |
240 | static inline int exofs_oi_write(struct exofs_i_info *oi, | |
241 | struct exofs_io_state *ios) | |
242 | { | |
243 | ios->obj.id = exofs_oi_objno(oi); | |
244 | ios->cred = oi->i_cred; | |
245 | return exofs_sbi_write(ios); | |
246 | } | |
247 | ||
248 | static inline int exofs_oi_read(struct exofs_i_info *oi, | |
249 | struct exofs_io_state *ios) | |
250 | { | |
251 | ios->obj.id = exofs_oi_objno(oi); | |
252 | ios->cred = oi->i_cred; | |
253 | return exofs_sbi_read(ios); | |
254 | } | |
255 | ||
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256 | /* inode.c */ |
257 | void exofs_truncate(struct inode *inode); | |
258 | int exofs_setattr(struct dentry *, struct iattr *); | |
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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); | |
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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); |
ba9e5e98 | 265 | extern void exofs_delete_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 | |
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280 | /* super.c */ |
281 | int exofs_sync_fs(struct super_block *sb, int wait); | |
282 | ||
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283 | /********************* |
284 | * operation vectors * | |
285 | *********************/ | |
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286 | /* dir.c: */ |
287 | extern const struct file_operations exofs_dir_operations; | |
288 | ||
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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 | ||
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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 |