blob: 5ec72e020b22bb8fcbb1f08d1df4af037ab179bd [file] [log] [blame]
Boaz Harroshb14f8ab2008-10-27 18:27:55 +02001/*
2 * Copyright (C) 2005, 2006
Boaz Harrosh27d2e142009-06-14 17:23:09 +03003 * Avishay Traeger (avishay@gmail.com)
Boaz Harroshb14f8ab2008-10-27 18:27:55 +02004 * 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 */
57struct 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 */
72struct 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
88static inline int obj_2bcreated(struct exofs_i_info *oi)
89{
90 return test_bit(OBJ_2BCREATED, &oi->i_flags);
91}
92
93static inline void set_obj_2bcreated(struct exofs_i_info *oi)
94{
95 set_bit(OBJ_2BCREATED, &oi->i_flags);
96}
97
98static inline int obj_created(struct exofs_i_info *oi)
99{
100 return test_bit(OBJ_CREATED, &oi->i_flags);
101}
102
103static inline void set_obj_created(struct exofs_i_info *oi)
104{
105 set_bit(OBJ_CREATED, &oi->i_flags);
106}
107
108int __exofs_wait_obj_created(struct exofs_i_info *oi);
109static 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 */
120static inline struct exofs_i_info *exofs_i(struct inode *inode)
121{
122 return container_of(inode, struct exofs_i_info, vfs_inode);
123}
124
Boaz Harroshe6af00f2008-10-28 15:38:12 +0200125/*
126 * Maximum count of links to a file
127 */
128#define EXOFS_LINK_MAX 32000
129
Boaz Harroshe8062712008-10-27 18:37:02 +0200130/*************************
131 * function declarations *
132 *************************/
133/* inode.c */
134void exofs_truncate(struct inode *inode);
135int exofs_setattr(struct dentry *, struct iattr *);
Boaz Harroshbeaec072008-10-27 19:31:34 +0200136int exofs_write_begin(struct file *file, struct address_space *mapping,
137 loff_t pos, unsigned len, unsigned flags,
138 struct page **pagep, void **fsdata);
Boaz Harroshe6af00f2008-10-28 15:38:12 +0200139extern struct inode *exofs_iget(struct super_block *, unsigned long);
140struct inode *exofs_new_inode(struct inode *, int);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200141extern int exofs_write_inode(struct inode *, int);
142extern void exofs_delete_inode(struct inode *);
Boaz Harroshe6af00f2008-10-28 15:38:12 +0200143
144/* dir.c: */
145int exofs_add_link(struct dentry *, struct inode *);
146ino_t exofs_inode_by_name(struct inode *, struct dentry *);
147int exofs_delete_entry(struct exofs_dir_entry *, struct page *);
148int exofs_make_empty(struct inode *, struct inode *);
149struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *,
150 struct page **);
151int exofs_empty_dir(struct inode *);
152struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **);
Boaz Harrosh8cf74b32009-03-22 12:47:26 +0200153ino_t exofs_parent_ino(struct dentry *child);
Boaz Harroshe6af00f2008-10-28 15:38:12 +0200154int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *,
155 struct inode *);
Boaz Harroshe8062712008-10-27 18:37:02 +0200156
Boaz Harroshbaaf94c2009-06-14 16:52:10 +0300157/* super.c */
158int exofs_sync_fs(struct super_block *sb, int wait);
159
Boaz Harroshe8062712008-10-27 18:37:02 +0200160/*********************
161 * operation vectors *
162 *********************/
Boaz Harroshe6af00f2008-10-28 15:38:12 +0200163/* dir.c: */
164extern const struct file_operations exofs_dir_operations;
165
Boaz Harroshe8062712008-10-27 18:37:02 +0200166/* file.c */
167extern const struct inode_operations exofs_file_inode_operations;
168extern const struct file_operations exofs_file_operations;
169
Boaz Harroshbeaec072008-10-27 19:31:34 +0200170/* inode.c */
171extern const struct address_space_operations exofs_aops;
172
Boaz Harroshe6af00f2008-10-28 15:38:12 +0200173/* namei.c */
174extern const struct inode_operations exofs_dir_inode_operations;
175extern const struct inode_operations exofs_special_inode_operations;
176
Boaz Harrosh982980d2008-10-27 19:04:34 +0200177/* symlink.c */
178extern const struct inode_operations exofs_symlink_inode_operations;
179extern const struct inode_operations exofs_fast_symlink_inode_operations;
180
Boaz Harroshb14f8ab2008-10-27 18:27:55 +0200181#endif