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1 | /* |
2 | * Copyright (C) 2005, 2006 |
3 | * Avishay Traeger (avishay@gmail.com) |
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 | |
125 | /* |
126 | * Maximum count of links to a file |
127 | */ |
128 | #define EXOFS_LINK_MAX 32000 |
129 | |
130 | /************************* |
131 | * function declarations * |
132 | *************************/ |
133 | /* inode.c */ |
134 | void exofs_truncate(struct inode *inode); |
135 | int exofs_setattr(struct dentry *, struct iattr *); |
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); |
139 | extern struct inode *exofs_iget(struct super_block *, unsigned long); |
140 | struct inode *exofs_new_inode(struct inode *, int); |
141 | extern int exofs_write_inode(struct inode *, int); |
142 | extern void exofs_delete_inode(struct inode *); |
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 **); |
153 | ino_t exofs_parent_ino(struct dentry *child); |
154 | int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *, |
155 | struct inode *); |
156 | |
157 | /* super.c */ |
158 | int exofs_sync_fs(struct super_block *sb, int wait); |
159 | |
160 | /********************* |
161 | * operation vectors * |
162 | *********************/ |
163 | /* dir.c: */ |
164 | extern const struct file_operations exofs_dir_operations; |
165 | |
166 | /* file.c */ |
167 | extern const struct inode_operations exofs_file_inode_operations; |
168 | extern const struct file_operations exofs_file_operations; |
169 | |
170 | /* inode.c */ |
171 | extern const struct address_space_operations exofs_aops; |
172 | |
173 | /* namei.c */ |
174 | extern const struct inode_operations exofs_dir_inode_operations; |
175 | extern const struct inode_operations exofs_special_inode_operations; |
176 | |
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 | |
181 | #endif |
182 |
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