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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#ifndef __EXOFS_H__
34#define __EXOFS_H__
35
36#include <linux/fs.h>
37#include <linux/time.h>
38#include <linux/backing-dev.h>
39#include <scsi/osd_ore.h>
40
41#include "common.h"
42
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
56/*
57 * our extension to the in-memory superblock
58 */
59struct exofs_sb_info {
60 struct backing_dev_info bdi; /* register our bdi with VFS */
61 struct exofs_sb_stats s_ess; /* Written often, pre-allocate*/
62 int s_timeout; /* timeout for OSD operations */
63 uint64_t s_nextid; /* highest object ID used */
64 uint32_t s_numfiles; /* number of files on fs */
65 spinlock_t s_next_gen_lock; /* spinlock for gen # update */
66 u32 s_next_generation; /* next gen # to use */
67 atomic_t s_curr_pending; /* number of pending commands */
68
69 struct pnfs_osd_data_map data_map; /* Default raid to use
70 * FIXME: Needed ?
71 */
72 struct ore_layout layout; /* Default files layout */
73 struct ore_comp one_comp; /* id & cred of partition id=0*/
74 struct ore_components comps; /* comps for the partition */
75 struct osd_dev *_min_one_dev[1]; /* Place holder for one dev */
76};
77
78/*
79 * our extension to the in-memory inode
80 */
81struct exofs_i_info {
82 struct inode vfs_inode; /* normal in-memory inode */
83 wait_queue_head_t i_wq; /* wait queue for inode */
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 */
87 uint64_t i_commit_size; /* the object's written length */
88 struct ore_comp one_comp; /* same component for all devices */
89 struct ore_components comps; /* inode view of the device table */
90};
91
92static inline osd_id exofs_oi_objno(struct exofs_i_info *oi)
93{
94 return oi->vfs_inode.i_ino + EXOFS_OBJ_OFF;
95}
96
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
103static inline int obj_2bcreated(struct exofs_i_info *oi)
104{
105 return test_bit(OBJ_2BCREATED, &oi->i_flags);
106}
107
108static inline void set_obj_2bcreated(struct exofs_i_info *oi)
109{
110 set_bit(OBJ_2BCREATED, &oi->i_flags);
111}
112
113static inline int obj_created(struct exofs_i_info *oi)
114{
115 return test_bit(OBJ_CREATED, &oi->i_flags);
116}
117
118static inline void set_obj_created(struct exofs_i_info *oi)
119{
120 set_bit(OBJ_CREATED, &oi->i_flags);
121}
122
123int __exofs_wait_obj_created(struct exofs_i_info *oi);
124static 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 */
135static inline struct exofs_i_info *exofs_i(struct inode *inode)
136{
137 return container_of(inode, struct exofs_i_info, vfs_inode);
138}
139
140/*
141 * Maximum count of links to a file
142 */
143#define EXOFS_LINK_MAX 32000
144
145/*************************
146 * function declarations *
147 *************************/
148
149/* inode.c */
150unsigned exofs_max_io_pages(struct ore_layout *layout,
151 unsigned expected_pages);
152int exofs_setattr(struct dentry *, struct iattr *);
153int exofs_write_begin(struct file *file, struct address_space *mapping,
154 loff_t pos, unsigned len, unsigned flags,
155 struct page **pagep, void **fsdata);
156extern struct inode *exofs_iget(struct super_block *, unsigned long);
157struct inode *exofs_new_inode(struct inode *, int);
158extern int exofs_write_inode(struct inode *, struct writeback_control *wbc);
159extern void exofs_evict_inode(struct inode *);
160
161/* dir.c: */
162int exofs_add_link(struct dentry *, struct inode *);
163ino_t exofs_inode_by_name(struct inode *, struct dentry *);
164int exofs_delete_entry(struct exofs_dir_entry *, struct page *);
165int exofs_make_empty(struct inode *, struct inode *);
166struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *,
167 struct page **);
168int exofs_empty_dir(struct inode *);
169struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **);
170ino_t exofs_parent_ino(struct dentry *child);
171int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *,
172 struct inode *);
173
174/* super.c */
175void exofs_make_credential(u8 cred_a[OSD_CAP_LEN],
176 const struct osd_obj_id *obj);
177int exofs_sbi_write_stats(struct exofs_sb_info *sbi);
178
179/*********************
180 * operation vectors *
181 *********************/
182/* dir.c: */
183extern const struct file_operations exofs_dir_operations;
184
185/* file.c */
186extern const struct inode_operations exofs_file_inode_operations;
187extern const struct file_operations exofs_file_operations;
188
189/* inode.c */
190extern const struct address_space_operations exofs_aops;
191
192/* namei.c */
193extern const struct inode_operations exofs_dir_inode_operations;
194extern const struct inode_operations exofs_special_inode_operations;
195
196/* symlink.c */
197extern const struct inode_operations exofs_symlink_inode_operations;
198extern const struct inode_operations exofs_fast_symlink_inode_operations;
199
200/* exofs_init_comps will initialize an ore_components device array
201 * pointing to a single ore_comp struct, and a round-robin view
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 */
210static inline void exofs_init_comps(struct ore_components *comps,
211 struct ore_comp *one_comp,
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
220 comps->numdevs = sbi->comps.numdevs;
221 comps->single_comp = EC_SINGLE_COMP;
222 comps->comps = one_comp;
223
224 /* Round robin device view of the table */
225 first_dev = (dev_mod * sbi->layout.mirrors_p1) % sbi->comps.numdevs;
226 comps->ods = sbi->comps.ods + first_dev;
227}
228
229#endif