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1 | /* |
2 | * Copyright (C) 2005, 2006 | |
27d2e149 | 3 | * Avishay Traeger (avishay@gmail.com) |
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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 | ||
58 | /* | |
59 | * our extension to the in-memory superblock | |
60 | */ | |
61 | struct exofs_sb_info { | |
06886a5a | 62 | struct exofs_fscb s_fscb; /* Written often, pre-allocate*/ |
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63 | osd_id s_pid; /* partition ID of file system*/ |
64 | int s_timeout; /* timeout for OSD operations */ | |
65 | uint64_t s_nextid; /* highest object ID used */ | |
66 | uint32_t s_numfiles; /* number of files on fs */ | |
67 | spinlock_t s_next_gen_lock; /* spinlock for gen # update */ | |
68 | u32 s_next_generation; /* next gen # to use */ | |
69 | atomic_t s_curr_pending; /* number of pending commands */ | |
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70 | uint8_t s_cred[OSD_CAP_LEN]; /* credential for the fscb */ |
71 | ||
72 | struct pnfs_osd_data_map data_map; /* Default raid to use */ | |
73 | unsigned s_numdevs; /* Num of devices in array */ | |
74 | struct osd_dev *s_ods[1]; /* Variable length, minimum 1 */ | |
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75 | }; |
76 | ||
77 | /* | |
78 | * our extension to the in-memory inode | |
79 | */ | |
80 | struct exofs_i_info { | |
81 | unsigned long i_flags; /* various atomic flags */ | |
82 | uint32_t i_data[EXOFS_IDATA];/*short symlink names and device #s*/ | |
83 | uint32_t i_dir_start_lookup; /* which page to start lookup */ | |
84 | wait_queue_head_t i_wq; /* wait queue for inode */ | |
85 | uint64_t i_commit_size; /* the object's written length */ | |
86 | uint8_t i_cred[OSD_CAP_LEN];/* all-powerful credential */ | |
87 | struct inode vfs_inode; /* normal in-memory inode */ | |
88 | }; | |
89 | ||
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90 | static inline osd_id exofs_oi_objno(struct exofs_i_info *oi) |
91 | { | |
92 | return oi->vfs_inode.i_ino + EXOFS_OBJ_OFF; | |
93 | } | |
94 | ||
95 | struct exofs_io_state; | |
96 | typedef void (*exofs_io_done_fn)(struct exofs_io_state *or, void *private); | |
97 | ||
98 | struct exofs_io_state { | |
99 | struct kref kref; | |
100 | ||
101 | void *private; | |
102 | exofs_io_done_fn done; | |
103 | ||
104 | struct exofs_sb_info *sbi; | |
105 | struct osd_obj_id obj; | |
106 | u8 *cred; | |
107 | ||
108 | /* Global read/write IO*/ | |
109 | loff_t offset; | |
110 | unsigned long length; | |
111 | void *kern_buff; | |
112 | struct bio *bio; | |
113 | ||
114 | /* Attributes */ | |
115 | unsigned in_attr_len; | |
116 | struct osd_attr *in_attr; | |
117 | unsigned out_attr_len; | |
118 | struct osd_attr *out_attr; | |
119 | ||
120 | /* Variable array of size numdevs */ | |
121 | unsigned numdevs; | |
122 | struct exofs_per_dev_state { | |
123 | struct osd_request *or; | |
124 | struct bio *bio; | |
125 | } per_dev[]; | |
126 | }; | |
127 | ||
128 | static inline unsigned exofs_io_state_size(unsigned numdevs) | |
129 | { | |
130 | return sizeof(struct exofs_io_state) + | |
131 | sizeof(struct exofs_per_dev_state) * numdevs; | |
132 | } | |
133 | ||
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134 | /* |
135 | * our inode flags | |
136 | */ | |
137 | #define OBJ_2BCREATED 0 /* object will be created soon*/ | |
138 | #define OBJ_CREATED 1 /* object has been created on the osd*/ | |
139 | ||
140 | static inline int obj_2bcreated(struct exofs_i_info *oi) | |
141 | { | |
142 | return test_bit(OBJ_2BCREATED, &oi->i_flags); | |
143 | } | |
144 | ||
145 | static inline void set_obj_2bcreated(struct exofs_i_info *oi) | |
146 | { | |
147 | set_bit(OBJ_2BCREATED, &oi->i_flags); | |
148 | } | |
149 | ||
150 | static inline int obj_created(struct exofs_i_info *oi) | |
151 | { | |
152 | return test_bit(OBJ_CREATED, &oi->i_flags); | |
153 | } | |
154 | ||
155 | static inline void set_obj_created(struct exofs_i_info *oi) | |
156 | { | |
157 | set_bit(OBJ_CREATED, &oi->i_flags); | |
158 | } | |
159 | ||
160 | int __exofs_wait_obj_created(struct exofs_i_info *oi); | |
161 | static inline int wait_obj_created(struct exofs_i_info *oi) | |
162 | { | |
163 | if (likely(obj_created(oi))) | |
164 | return 0; | |
165 | ||
166 | return __exofs_wait_obj_created(oi); | |
167 | } | |
168 | ||
169 | /* | |
170 | * get to our inode from the vfs inode | |
171 | */ | |
172 | static inline struct exofs_i_info *exofs_i(struct inode *inode) | |
173 | { | |
174 | return container_of(inode, struct exofs_i_info, vfs_inode); | |
175 | } | |
176 | ||
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177 | /* |
178 | * Maximum count of links to a file | |
179 | */ | |
180 | #define EXOFS_LINK_MAX 32000 | |
181 | ||
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182 | /************************* |
183 | * function declarations * | |
184 | *************************/ | |
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185 | |
186 | /* ios.c */ | |
187 | void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], | |
188 | const struct osd_obj_id *obj); | |
189 | int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj, | |
190 | u64 offset, void *p, unsigned length); | |
191 | ||
192 | int exofs_get_io_state(struct exofs_sb_info *sbi, struct exofs_io_state** ios); | |
193 | void exofs_put_io_state(struct exofs_io_state *ios); | |
194 | ||
195 | int exofs_check_io(struct exofs_io_state *ios, u64 *resid); | |
196 | ||
197 | int exofs_sbi_create(struct exofs_io_state *ios); | |
198 | int exofs_sbi_remove(struct exofs_io_state *ios); | |
199 | int exofs_sbi_write(struct exofs_io_state *ios); | |
200 | int exofs_sbi_read(struct exofs_io_state *ios); | |
201 | ||
202 | int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr); | |
203 | ||
204 | int exofs_oi_truncate(struct exofs_i_info *oi, u64 new_len); | |
205 | static inline int exofs_oi_write(struct exofs_i_info *oi, | |
206 | struct exofs_io_state *ios) | |
207 | { | |
208 | ios->obj.id = exofs_oi_objno(oi); | |
209 | ios->cred = oi->i_cred; | |
210 | return exofs_sbi_write(ios); | |
211 | } | |
212 | ||
213 | static inline int exofs_oi_read(struct exofs_i_info *oi, | |
214 | struct exofs_io_state *ios) | |
215 | { | |
216 | ios->obj.id = exofs_oi_objno(oi); | |
217 | ios->cred = oi->i_cred; | |
218 | return exofs_sbi_read(ios); | |
219 | } | |
220 | ||
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221 | /* inode.c */ |
222 | void exofs_truncate(struct inode *inode); | |
223 | int exofs_setattr(struct dentry *, struct iattr *); | |
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224 | int exofs_write_begin(struct file *file, struct address_space *mapping, |
225 | loff_t pos, unsigned len, unsigned flags, | |
226 | struct page **pagep, void **fsdata); | |
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227 | extern struct inode *exofs_iget(struct super_block *, unsigned long); |
228 | struct inode *exofs_new_inode(struct inode *, int); | |
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229 | extern int exofs_write_inode(struct inode *, int); |
230 | extern void exofs_delete_inode(struct inode *); | |
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231 | |
232 | /* dir.c: */ | |
233 | int exofs_add_link(struct dentry *, struct inode *); | |
234 | ino_t exofs_inode_by_name(struct inode *, struct dentry *); | |
235 | int exofs_delete_entry(struct exofs_dir_entry *, struct page *); | |
236 | int exofs_make_empty(struct inode *, struct inode *); | |
237 | struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *, | |
238 | struct page **); | |
239 | int exofs_empty_dir(struct inode *); | |
240 | struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **); | |
8cf74b39 | 241 | ino_t exofs_parent_ino(struct dentry *child); |
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242 | int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *, |
243 | struct inode *); | |
e8062719 | 244 | |
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245 | /* super.c */ |
246 | int exofs_sync_fs(struct super_block *sb, int wait); | |
247 | ||
e8062719 BH |
248 | /********************* |
249 | * operation vectors * | |
250 | *********************/ | |
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251 | /* dir.c: */ |
252 | extern const struct file_operations exofs_dir_operations; | |
253 | ||
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254 | /* file.c */ |
255 | extern const struct inode_operations exofs_file_inode_operations; | |
256 | extern const struct file_operations exofs_file_operations; | |
257 | ||
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258 | /* inode.c */ |
259 | extern const struct address_space_operations exofs_aops; | |
06886a5a | 260 | extern const struct osd_attr g_attr_logical_length; |
beaec07b | 261 | |
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262 | /* namei.c */ |
263 | extern const struct inode_operations exofs_dir_inode_operations; | |
264 | extern const struct inode_operations exofs_special_inode_operations; | |
265 | ||
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266 | /* symlink.c */ |
267 | extern const struct inode_operations exofs_symlink_inode_operations; | |
268 | extern const struct inode_operations exofs_fast_symlink_inode_operations; | |
269 | ||
b14f8ab2 | 270 | #endif |