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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 | */ | |
33 | ||
34 | #include <linux/fs.h> | |
35 | #include <linux/time.h> | |
36 | #include "common.h" | |
37 | ||
38 | #ifndef __EXOFS_H__ | |
39 | #define __EXOFS_H__ | |
40 | ||
41 | #define EXOFS_ERR(fmt, a...) printk(KERN_ERR "exofs: " fmt, ##a) | |
42 | ||
43 | #ifdef CONFIG_EXOFS_DEBUG | |
44 | #define EXOFS_DBGMSG(fmt, a...) \ | |
45 | printk(KERN_NOTICE "exofs @%s:%d: " fmt, __func__, __LINE__, ##a) | |
46 | #else | |
47 | #define EXOFS_DBGMSG(fmt, a...) \ | |
48 | do { if (0) printk(fmt, ##a); } while (0) | |
49 | #endif | |
50 | ||
51 | /* u64 has problems with printk this will cast it to unsigned long long */ | |
52 | #define _LLU(x) (unsigned long long)(x) | |
53 | ||
54 | /* | |
55 | * our extension to the in-memory superblock | |
56 | */ | |
57 | struct exofs_sb_info { | |
58 | struct osd_dev *s_dev; /* returned by get_osd_dev */ | |
59 | osd_id s_pid; /* partition ID of file system*/ | |
60 | int s_timeout; /* timeout for OSD operations */ | |
61 | uint64_t s_nextid; /* highest object ID used */ | |
62 | uint32_t s_numfiles; /* number of files on fs */ | |
63 | spinlock_t s_next_gen_lock; /* spinlock for gen # update */ | |
64 | u32 s_next_generation; /* next gen # to use */ | |
65 | atomic_t s_curr_pending; /* number of pending commands */ | |
66 | uint8_t s_cred[OSD_CAP_LEN]; /* all-powerful credential */ | |
67 | }; | |
68 | ||
69 | /* | |
70 | * our extension to the in-memory inode | |
71 | */ | |
72 | struct exofs_i_info { | |
73 | unsigned long i_flags; /* various atomic flags */ | |
74 | uint32_t i_data[EXOFS_IDATA];/*short symlink names and device #s*/ | |
75 | uint32_t i_dir_start_lookup; /* which page to start lookup */ | |
76 | wait_queue_head_t i_wq; /* wait queue for inode */ | |
77 | uint64_t i_commit_size; /* the object's written length */ | |
78 | uint8_t i_cred[OSD_CAP_LEN];/* all-powerful credential */ | |
79 | struct inode vfs_inode; /* normal in-memory inode */ | |
80 | }; | |
81 | ||
82 | /* | |
83 | * our inode flags | |
84 | */ | |
85 | #define OBJ_2BCREATED 0 /* object will be created soon*/ | |
86 | #define OBJ_CREATED 1 /* object has been created on the osd*/ | |
87 | ||
88 | static inline int obj_2bcreated(struct exofs_i_info *oi) | |
89 | { | |
90 | return test_bit(OBJ_2BCREATED, &oi->i_flags); | |
91 | } | |
92 | ||
93 | static inline void set_obj_2bcreated(struct exofs_i_info *oi) | |
94 | { | |
95 | set_bit(OBJ_2BCREATED, &oi->i_flags); | |
96 | } | |
97 | ||
98 | static inline int obj_created(struct exofs_i_info *oi) | |
99 | { | |
100 | return test_bit(OBJ_CREATED, &oi->i_flags); | |
101 | } | |
102 | ||
103 | static inline void set_obj_created(struct exofs_i_info *oi) | |
104 | { | |
105 | set_bit(OBJ_CREATED, &oi->i_flags); | |
106 | } | |
107 | ||
108 | int __exofs_wait_obj_created(struct exofs_i_info *oi); | |
109 | static inline int wait_obj_created(struct exofs_i_info *oi) | |
110 | { | |
111 | if (likely(obj_created(oi))) | |
112 | return 0; | |
113 | ||
114 | return __exofs_wait_obj_created(oi); | |
115 | } | |
116 | ||
117 | /* | |
118 | * get to our inode from the vfs inode | |
119 | */ | |
120 | static inline struct exofs_i_info *exofs_i(struct inode *inode) | |
121 | { | |
122 | return container_of(inode, struct exofs_i_info, vfs_inode); | |
123 | } | |
124 | ||
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125 | /* |
126 | * Maximum count of links to a file | |
127 | */ | |
128 | #define EXOFS_LINK_MAX 32000 | |
129 | ||
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130 | /************************* |
131 | * function declarations * | |
132 | *************************/ | |
133 | /* inode.c */ | |
134 | void exofs_truncate(struct inode *inode); | |
135 | int exofs_setattr(struct dentry *, struct iattr *); | |
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136 | int exofs_write_begin(struct file *file, struct address_space *mapping, |
137 | loff_t pos, unsigned len, unsigned flags, | |
138 | struct page **pagep, void **fsdata); | |
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139 | extern struct inode *exofs_iget(struct super_block *, unsigned long); |
140 | struct inode *exofs_new_inode(struct inode *, int); | |
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141 | extern int exofs_write_inode(struct inode *, int); |
142 | extern void exofs_delete_inode(struct inode *); | |
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143 | |
144 | /* dir.c: */ | |
145 | int exofs_add_link(struct dentry *, struct inode *); | |
146 | ino_t exofs_inode_by_name(struct inode *, struct dentry *); | |
147 | int exofs_delete_entry(struct exofs_dir_entry *, struct page *); | |
148 | int exofs_make_empty(struct inode *, struct inode *); | |
149 | struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *, | |
150 | struct page **); | |
151 | int exofs_empty_dir(struct inode *); | |
152 | struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **); | |
8cf74b39 | 153 | ino_t exofs_parent_ino(struct dentry *child); |
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154 | int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *, |
155 | struct inode *); | |
e8062719 | 156 | |
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157 | /* super.c */ |
158 | int exofs_sync_fs(struct super_block *sb, int wait); | |
159 | ||
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160 | /********************* |
161 | * operation vectors * | |
162 | *********************/ | |
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163 | /* dir.c: */ |
164 | extern const struct file_operations exofs_dir_operations; | |
165 | ||
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166 | /* file.c */ |
167 | extern const struct inode_operations exofs_file_inode_operations; | |
168 | extern const struct file_operations exofs_file_operations; | |
169 | ||
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170 | /* inode.c */ |
171 | extern const struct address_space_operations exofs_aops; | |
172 | ||
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173 | /* namei.c */ |
174 | extern const struct inode_operations exofs_dir_inode_operations; | |
175 | extern const struct inode_operations exofs_special_inode_operations; | |
176 | ||
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177 | /* symlink.c */ |
178 | extern const struct inode_operations exofs_symlink_inode_operations; | |
179 | extern const struct inode_operations exofs_fast_symlink_inode_operations; | |
180 | ||
b14f8ab2 | 181 | #endif |