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b14f8ab2 BH |
1 | /* |
2 | * Copyright (C) 2005, 2006 | |
27d2e149 | 3 | * Avishay Traeger (avishay@gmail.com) |
b14f8ab2 | 4 | * Copyright (C) 2008, 2009 |
aa281ac6 | 5 | * Boaz Harrosh <ooo@electrozaur.com> |
b14f8ab2 BH |
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 | */ | |
06886a5a BH |
33 | #ifndef __EXOFS_H__ |
34 | #define __EXOFS_H__ | |
b14f8ab2 BH |
35 | |
36 | #include <linux/fs.h> | |
37 | #include <linux/time.h> | |
b3d0ab7e | 38 | #include <linux/backing-dev.h> |
8ff660ab BH |
39 | #include <scsi/osd_ore.h> |
40 | ||
b14f8ab2 BH |
41 | #include "common.h" |
42 | ||
b14f8ab2 BH |
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 | ||
d866d875 BH |
56 | struct exofs_dev { |
57 | struct ore_dev ored; | |
58 | unsigned did; | |
8b56a30c SB |
59 | unsigned urilen; |
60 | uint8_t *uri; | |
61 | struct kobject ed_kobj; | |
d866d875 | 62 | }; |
b14f8ab2 BH |
63 | /* |
64 | * our extension to the in-memory superblock | |
65 | */ | |
66 | struct exofs_sb_info { | |
1cea312a | 67 | struct exofs_sb_stats s_ess; /* Written often, pre-allocate*/ |
b14f8ab2 BH |
68 | int s_timeout; /* timeout for OSD operations */ |
69 | uint64_t s_nextid; /* highest object ID used */ | |
70 | uint32_t s_numfiles; /* number of files on fs */ | |
71 | spinlock_t s_next_gen_lock; /* spinlock for gen # update */ | |
72 | u32 s_next_generation; /* next gen # to use */ | |
73 | atomic_t s_curr_pending; /* number of pending commands */ | |
04dc1e88 | 74 | |
8ff660ab BH |
75 | struct ore_layout layout; /* Default files layout */ |
76 | struct ore_comp one_comp; /* id & cred of partition id=0*/ | |
5bf696da | 77 | struct ore_components oc; /* comps for the partition */ |
8b56a30c | 78 | struct kobject s_kobj; /* holds per-sbi kobject */ |
b14f8ab2 BH |
79 | }; |
80 | ||
81 | /* | |
82 | * our extension to the in-memory inode | |
83 | */ | |
84 | struct exofs_i_info { | |
518f167a BH |
85 | struct inode vfs_inode; /* normal in-memory inode */ |
86 | wait_queue_head_t i_wq; /* wait queue for inode */ | |
b14f8ab2 BH |
87 | unsigned long i_flags; /* various atomic flags */ |
88 | uint32_t i_data[EXOFS_IDATA];/*short symlink names and device #s*/ | |
89 | uint32_t i_dir_start_lookup; /* which page to start lookup */ | |
b14f8ab2 | 90 | uint64_t i_commit_size; /* the object's written length */ |
8ff660ab | 91 | struct ore_comp one_comp; /* same component for all devices */ |
5bf696da | 92 | struct ore_components oc; /* inode view of the device table */ |
b14f8ab2 BH |
93 | }; |
94 | ||
06886a5a BH |
95 | static inline osd_id exofs_oi_objno(struct exofs_i_info *oi) |
96 | { | |
97 | return oi->vfs_inode.i_ino + EXOFS_OBJ_OFF; | |
98 | } | |
99 | ||
b14f8ab2 BH |
100 | /* |
101 | * our inode flags | |
102 | */ | |
103 | #define OBJ_2BCREATED 0 /* object will be created soon*/ | |
104 | #define OBJ_CREATED 1 /* object has been created on the osd*/ | |
105 | ||
106 | static inline int obj_2bcreated(struct exofs_i_info *oi) | |
107 | { | |
108 | return test_bit(OBJ_2BCREATED, &oi->i_flags); | |
109 | } | |
110 | ||
111 | static inline void set_obj_2bcreated(struct exofs_i_info *oi) | |
112 | { | |
113 | set_bit(OBJ_2BCREATED, &oi->i_flags); | |
114 | } | |
115 | ||
116 | static inline int obj_created(struct exofs_i_info *oi) | |
117 | { | |
118 | return test_bit(OBJ_CREATED, &oi->i_flags); | |
119 | } | |
120 | ||
121 | static inline void set_obj_created(struct exofs_i_info *oi) | |
122 | { | |
123 | set_bit(OBJ_CREATED, &oi->i_flags); | |
124 | } | |
125 | ||
126 | int __exofs_wait_obj_created(struct exofs_i_info *oi); | |
127 | static inline int wait_obj_created(struct exofs_i_info *oi) | |
128 | { | |
129 | if (likely(obj_created(oi))) | |
130 | return 0; | |
131 | ||
132 | return __exofs_wait_obj_created(oi); | |
133 | } | |
134 | ||
135 | /* | |
136 | * get to our inode from the vfs inode | |
137 | */ | |
138 | static inline struct exofs_i_info *exofs_i(struct inode *inode) | |
139 | { | |
140 | return container_of(inode, struct exofs_i_info, vfs_inode); | |
141 | } | |
142 | ||
e6af00f1 BH |
143 | /* |
144 | * Maximum count of links to a file | |
145 | */ | |
146 | #define EXOFS_LINK_MAX 32000 | |
147 | ||
e8062719 BH |
148 | /************************* |
149 | * function declarations * | |
150 | *************************/ | |
06886a5a | 151 | |
e8062719 | 152 | /* inode.c */ |
8ff660ab | 153 | unsigned exofs_max_io_pages(struct ore_layout *layout, |
66cd6cad | 154 | unsigned expected_pages); |
e8062719 | 155 | int exofs_setattr(struct dentry *, struct iattr *); |
beaec07b BH |
156 | int exofs_write_begin(struct file *file, struct address_space *mapping, |
157 | loff_t pos, unsigned len, unsigned flags, | |
158 | struct page **pagep, void **fsdata); | |
e6af00f1 | 159 | extern struct inode *exofs_iget(struct super_block *, unsigned long); |
bef41c26 | 160 | struct inode *exofs_new_inode(struct inode *, umode_t); |
a9185b41 | 161 | extern int exofs_write_inode(struct inode *, struct writeback_control *wbc); |
4ec70c9b | 162 | extern void exofs_evict_inode(struct inode *); |
e6af00f1 BH |
163 | |
164 | /* dir.c: */ | |
165 | int exofs_add_link(struct dentry *, struct inode *); | |
166 | ino_t exofs_inode_by_name(struct inode *, struct dentry *); | |
167 | int exofs_delete_entry(struct exofs_dir_entry *, struct page *); | |
168 | int exofs_make_empty(struct inode *, struct inode *); | |
169 | struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *, | |
170 | struct page **); | |
171 | int exofs_empty_dir(struct inode *); | |
172 | struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **); | |
8cf74b39 | 173 | ino_t exofs_parent_ino(struct dentry *child); |
e6af00f1 BH |
174 | int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *, |
175 | struct inode *); | |
e8062719 | 176 | |
baaf94cd | 177 | /* super.c */ |
85e44df4 BH |
178 | void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], |
179 | const struct osd_obj_id *obj); | |
1cea312a | 180 | int exofs_sbi_write_stats(struct exofs_sb_info *sbi); |
baaf94cd | 181 | |
8b56a30c SB |
182 | /* sys.c */ |
183 | int exofs_sysfs_init(void); | |
184 | void exofs_sysfs_uninit(void); | |
185 | int exofs_sysfs_sb_add(struct exofs_sb_info *sbi, | |
186 | struct exofs_dt_device_info *dt_dev); | |
187 | void exofs_sysfs_sb_del(struct exofs_sb_info *sbi); | |
188 | int exofs_sysfs_odev_add(struct exofs_dev *edev, | |
189 | struct exofs_sb_info *sbi); | |
190 | void exofs_sysfs_dbg_print(void); | |
191 | ||
e8062719 BH |
192 | /********************* |
193 | * operation vectors * | |
194 | *********************/ | |
e6af00f1 BH |
195 | /* dir.c: */ |
196 | extern const struct file_operations exofs_dir_operations; | |
197 | ||
e8062719 BH |
198 | /* file.c */ |
199 | extern const struct inode_operations exofs_file_inode_operations; | |
200 | extern const struct file_operations exofs_file_operations; | |
201 | ||
beaec07b BH |
202 | /* inode.c */ |
203 | extern const struct address_space_operations exofs_aops; | |
204 | ||
e6af00f1 BH |
205 | /* namei.c */ |
206 | extern const struct inode_operations exofs_dir_inode_operations; | |
207 | extern const struct inode_operations exofs_special_inode_operations; | |
208 | ||
8ff660ab BH |
209 | /* exofs_init_comps will initialize an ore_components device array |
210 | * pointing to a single ore_comp struct, and a round-robin view | |
9e9db456 BH |
211 | * of the device table. |
212 | * The first device of each inode is the [inode->ino % num_devices] | |
213 | * and the rest of the devices sequentially following where the | |
214 | * first device is after the last device. | |
215 | * It is assumed that the global device array at @sbi is twice | |
216 | * bigger and that the device table repeats twice. | |
217 | * See: exofs_read_lookup_dev_table() | |
218 | */ | |
5bf696da | 219 | static inline void exofs_init_comps(struct ore_components *oc, |
8ff660ab | 220 | struct ore_comp *one_comp, |
9e9db456 BH |
221 | struct exofs_sb_info *sbi, osd_id oid) |
222 | { | |
223 | unsigned dev_mod = (unsigned)oid, first_dev; | |
224 | ||
225 | one_comp->obj.partition = sbi->one_comp.obj.partition; | |
226 | one_comp->obj.id = oid; | |
227 | exofs_make_credential(one_comp->cred, &one_comp->obj); | |
228 | ||
3bd98568 | 229 | oc->first_dev = 0; |
d866d875 BH |
230 | oc->numdevs = sbi->layout.group_width * sbi->layout.mirrors_p1 * |
231 | sbi->layout.group_count; | |
5bf696da BH |
232 | oc->single_comp = EC_SINGLE_COMP; |
233 | oc->comps = one_comp; | |
9e9db456 BH |
234 | |
235 | /* Round robin device view of the table */ | |
5bf696da | 236 | first_dev = (dev_mod * sbi->layout.mirrors_p1) % sbi->oc.numdevs; |
d866d875 | 237 | oc->ods = &sbi->oc.ods[first_dev]; |
9e9db456 BH |
238 | } |
239 | ||
b14f8ab2 | 240 | #endif |