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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> |
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39 | #include <scsi/osd_ore.h> |
40 | ||
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41 | #include "common.h" |
42 | ||
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43 | #define EXOFS_ERR(fmt, a...) printk(KERN_ERR "exofs: " fmt, ##a) |
44 | ||
45 | #ifdef CONFIG_EXOFS_DEBUG | |
46 | #define EXOFS_DBGMSG(fmt, a...) \ | |
47 | printk(KERN_NOTICE "exofs @%s:%d: " fmt, __func__, __LINE__, ##a) | |
48 | #else | |
49 | #define EXOFS_DBGMSG(fmt, a...) \ | |
50 | do { if (0) printk(fmt, ##a); } while (0) | |
51 | #endif | |
52 | ||
53 | /* u64 has problems with printk this will cast it to unsigned long long */ | |
54 | #define _LLU(x) (unsigned long long)(x) | |
55 | ||
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56 | struct exofs_dev { |
57 | struct ore_dev ored; | |
58 | unsigned did; | |
59 | }; | |
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60 | /* |
61 | * our extension to the in-memory superblock | |
62 | */ | |
63 | struct exofs_sb_info { | |
6d4073e8 | 64 | struct backing_dev_info bdi; /* register our bdi with VFS */ |
1cea312a | 65 | struct exofs_sb_stats s_ess; /* Written often, pre-allocate*/ |
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66 | int s_timeout; /* timeout for OSD operations */ |
67 | uint64_t s_nextid; /* highest object ID used */ | |
68 | uint32_t s_numfiles; /* number of files on fs */ | |
69 | spinlock_t s_next_gen_lock; /* spinlock for gen # update */ | |
70 | u32 s_next_generation; /* next gen # to use */ | |
71 | atomic_t s_curr_pending; /* number of pending commands */ | |
04dc1e88 | 72 | |
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73 | struct ore_layout layout; /* Default files layout */ |
74 | struct ore_comp one_comp; /* id & cred of partition id=0*/ | |
5bf696da | 75 | struct ore_components oc; /* comps for the partition */ |
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76 | }; |
77 | ||
78 | /* | |
79 | * our extension to the in-memory inode | |
80 | */ | |
81 | struct exofs_i_info { | |
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82 | struct inode vfs_inode; /* normal in-memory inode */ |
83 | wait_queue_head_t i_wq; /* wait queue for inode */ | |
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84 | unsigned long i_flags; /* various atomic flags */ |
85 | uint32_t i_data[EXOFS_IDATA];/*short symlink names and device #s*/ | |
86 | uint32_t i_dir_start_lookup; /* which page to start lookup */ | |
b14f8ab2 | 87 | uint64_t i_commit_size; /* the object's written length */ |
8ff660ab | 88 | struct ore_comp one_comp; /* same component for all devices */ |
5bf696da | 89 | struct ore_components oc; /* inode view of the device table */ |
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90 | }; |
91 | ||
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92 | static inline osd_id exofs_oi_objno(struct exofs_i_info *oi) |
93 | { | |
94 | return oi->vfs_inode.i_ino + EXOFS_OBJ_OFF; | |
95 | } | |
96 | ||
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97 | /* |
98 | * our inode flags | |
99 | */ | |
100 | #define OBJ_2BCREATED 0 /* object will be created soon*/ | |
101 | #define OBJ_CREATED 1 /* object has been created on the osd*/ | |
102 | ||
103 | static inline int obj_2bcreated(struct exofs_i_info *oi) | |
104 | { | |
105 | return test_bit(OBJ_2BCREATED, &oi->i_flags); | |
106 | } | |
107 | ||
108 | static inline void set_obj_2bcreated(struct exofs_i_info *oi) | |
109 | { | |
110 | set_bit(OBJ_2BCREATED, &oi->i_flags); | |
111 | } | |
112 | ||
113 | static inline int obj_created(struct exofs_i_info *oi) | |
114 | { | |
115 | return test_bit(OBJ_CREATED, &oi->i_flags); | |
116 | } | |
117 | ||
118 | static inline void set_obj_created(struct exofs_i_info *oi) | |
119 | { | |
120 | set_bit(OBJ_CREATED, &oi->i_flags); | |
121 | } | |
122 | ||
123 | int __exofs_wait_obj_created(struct exofs_i_info *oi); | |
124 | static inline int wait_obj_created(struct exofs_i_info *oi) | |
125 | { | |
126 | if (likely(obj_created(oi))) | |
127 | return 0; | |
128 | ||
129 | return __exofs_wait_obj_created(oi); | |
130 | } | |
131 | ||
132 | /* | |
133 | * get to our inode from the vfs inode | |
134 | */ | |
135 | static inline struct exofs_i_info *exofs_i(struct inode *inode) | |
136 | { | |
137 | return container_of(inode, struct exofs_i_info, vfs_inode); | |
138 | } | |
139 | ||
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140 | /* |
141 | * Maximum count of links to a file | |
142 | */ | |
143 | #define EXOFS_LINK_MAX 32000 | |
144 | ||
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145 | /************************* |
146 | * function declarations * | |
147 | *************************/ | |
06886a5a | 148 | |
e8062719 | 149 | /* inode.c */ |
8ff660ab | 150 | unsigned exofs_max_io_pages(struct ore_layout *layout, |
66cd6cad | 151 | unsigned expected_pages); |
e8062719 | 152 | int exofs_setattr(struct dentry *, struct iattr *); |
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153 | int exofs_write_begin(struct file *file, struct address_space *mapping, |
154 | loff_t pos, unsigned len, unsigned flags, | |
155 | struct page **pagep, void **fsdata); | |
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156 | extern struct inode *exofs_iget(struct super_block *, unsigned long); |
157 | struct inode *exofs_new_inode(struct inode *, int); | |
a9185b41 | 158 | extern int exofs_write_inode(struct inode *, struct writeback_control *wbc); |
4ec70c9b | 159 | extern void exofs_evict_inode(struct inode *); |
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160 | |
161 | /* dir.c: */ | |
162 | int exofs_add_link(struct dentry *, struct inode *); | |
163 | ino_t exofs_inode_by_name(struct inode *, struct dentry *); | |
164 | int exofs_delete_entry(struct exofs_dir_entry *, struct page *); | |
165 | int exofs_make_empty(struct inode *, struct inode *); | |
166 | struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *, | |
167 | struct page **); | |
168 | int exofs_empty_dir(struct inode *); | |
169 | struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **); | |
8cf74b39 | 170 | ino_t exofs_parent_ino(struct dentry *child); |
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171 | int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *, |
172 | struct inode *); | |
e8062719 | 173 | |
baaf94cd | 174 | /* super.c */ |
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175 | void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], |
176 | const struct osd_obj_id *obj); | |
1cea312a | 177 | int exofs_sbi_write_stats(struct exofs_sb_info *sbi); |
baaf94cd | 178 | |
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179 | /********************* |
180 | * operation vectors * | |
181 | *********************/ | |
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182 | /* dir.c: */ |
183 | extern const struct file_operations exofs_dir_operations; | |
184 | ||
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185 | /* file.c */ |
186 | extern const struct inode_operations exofs_file_inode_operations; | |
187 | extern const struct file_operations exofs_file_operations; | |
188 | ||
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189 | /* inode.c */ |
190 | extern const struct address_space_operations exofs_aops; | |
191 | ||
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192 | /* namei.c */ |
193 | extern const struct inode_operations exofs_dir_inode_operations; | |
194 | extern const struct inode_operations exofs_special_inode_operations; | |
195 | ||
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196 | /* symlink.c */ |
197 | extern const struct inode_operations exofs_symlink_inode_operations; | |
198 | extern const struct inode_operations exofs_fast_symlink_inode_operations; | |
199 | ||
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200 | /* exofs_init_comps will initialize an ore_components device array |
201 | * pointing to a single ore_comp struct, and a round-robin view | |
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202 | * of the device table. |
203 | * The first device of each inode is the [inode->ino % num_devices] | |
204 | * and the rest of the devices sequentially following where the | |
205 | * first device is after the last device. | |
206 | * It is assumed that the global device array at @sbi is twice | |
207 | * bigger and that the device table repeats twice. | |
208 | * See: exofs_read_lookup_dev_table() | |
209 | */ | |
5bf696da | 210 | static inline void exofs_init_comps(struct ore_components *oc, |
8ff660ab | 211 | struct ore_comp *one_comp, |
9e9db456 BH |
212 | struct exofs_sb_info *sbi, osd_id oid) |
213 | { | |
214 | unsigned dev_mod = (unsigned)oid, first_dev; | |
215 | ||
216 | one_comp->obj.partition = sbi->one_comp.obj.partition; | |
217 | one_comp->obj.id = oid; | |
218 | exofs_make_credential(one_comp->cred, &one_comp->obj); | |
219 | ||
3bd98568 | 220 | oc->first_dev = 0; |
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221 | oc->numdevs = sbi->layout.group_width * sbi->layout.mirrors_p1 * |
222 | sbi->layout.group_count; | |
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223 | oc->single_comp = EC_SINGLE_COMP; |
224 | oc->comps = one_comp; | |
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225 | |
226 | /* Round robin device view of the table */ | |
5bf696da | 227 | first_dev = (dev_mod * sbi->layout.mirrors_p1) % sbi->oc.numdevs; |
d866d875 | 228 | oc->ods = &sbi->oc.ods[first_dev]; |
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229 | } |
230 | ||
b14f8ab2 | 231 | #endif |