2 * Copyright (C) 2005, 2006
3 * Avishay Traeger (avishay@gmail.com)
4 * Copyright (C) 2008, 2009
5 * Boaz Harrosh <bharrosh@panasas.com>
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)
13 * linux/fs/minix/inode.c
14 * Copyright (C) 1991, 1992 Linus Torvalds
16 * This file is part of exofs.
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.
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.
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
37 #include <linux/time.h>
40 #define EXOFS_ERR(fmt, a...) printk(KERN_ERR "exofs: " fmt, ##a)
42 #ifdef CONFIG_EXOFS_DEBUG
43 #define EXOFS_DBGMSG(fmt, a...) \
44 printk(KERN_NOTICE "exofs @%s:%d: " fmt, __func__, __LINE__, ##a)
46 #define EXOFS_DBGMSG(fmt, a...) \
47 do { if (0) printk(fmt, ##a); } while (0)
50 /* u64 has problems with printk this will cast it to unsigned long long */
51 #define _LLU(x) (unsigned long long)(x)
54 * our extension to the in-memory superblock
56 struct exofs_sb_info {
57 struct osd_dev *s_dev; /* returned by get_osd_dev */
58 struct exofs_fscb s_fscb; /* Written often, pre-allocate*/
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 */
70 * our extension to the in-memory inode
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 */
82 static inline osd_id exofs_oi_objno(struct exofs_i_info *oi)
84 return oi->vfs_inode.i_ino + EXOFS_OBJ_OFF;
87 struct exofs_io_state;
88 typedef void (*exofs_io_done_fn)(struct exofs_io_state *or, void *private);
90 struct exofs_io_state {
94 exofs_io_done_fn done;
96 struct exofs_sb_info *sbi;
97 struct osd_obj_id obj;
100 /* Global read/write IO*/
102 unsigned long length;
107 unsigned in_attr_len;
108 struct osd_attr *in_attr;
109 unsigned out_attr_len;
110 struct osd_attr *out_attr;
112 /* Variable array of size numdevs */
114 struct exofs_per_dev_state {
115 struct osd_request *or;
120 static inline unsigned exofs_io_state_size(unsigned numdevs)
122 return sizeof(struct exofs_io_state) +
123 sizeof(struct exofs_per_dev_state) * numdevs;
129 #define OBJ_2BCREATED 0 /* object will be created soon*/
130 #define OBJ_CREATED 1 /* object has been created on the osd*/
132 static inline int obj_2bcreated(struct exofs_i_info *oi)
134 return test_bit(OBJ_2BCREATED, &oi->i_flags);
137 static inline void set_obj_2bcreated(struct exofs_i_info *oi)
139 set_bit(OBJ_2BCREATED, &oi->i_flags);
142 static inline int obj_created(struct exofs_i_info *oi)
144 return test_bit(OBJ_CREATED, &oi->i_flags);
147 static inline void set_obj_created(struct exofs_i_info *oi)
149 set_bit(OBJ_CREATED, &oi->i_flags);
152 int __exofs_wait_obj_created(struct exofs_i_info *oi);
153 static inline int wait_obj_created(struct exofs_i_info *oi)
155 if (likely(obj_created(oi)))
158 return __exofs_wait_obj_created(oi);
162 * get to our inode from the vfs inode
164 static inline struct exofs_i_info *exofs_i(struct inode *inode)
166 return container_of(inode, struct exofs_i_info, vfs_inode);
170 * Maximum count of links to a file
172 #define EXOFS_LINK_MAX 32000
174 /*************************
175 * function declarations *
176 *************************/
179 void exofs_make_credential(u8 cred_a[OSD_CAP_LEN],
180 const struct osd_obj_id *obj);
181 int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj,
182 u64 offset, void *p, unsigned length);
184 int exofs_get_io_state(struct exofs_sb_info *sbi, struct exofs_io_state** ios);
185 void exofs_put_io_state(struct exofs_io_state *ios);
187 int exofs_check_io(struct exofs_io_state *ios, u64 *resid);
189 int exofs_sbi_create(struct exofs_io_state *ios);
190 int exofs_sbi_remove(struct exofs_io_state *ios);
191 int exofs_sbi_write(struct exofs_io_state *ios);
192 int exofs_sbi_read(struct exofs_io_state *ios);
194 int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr);
196 int exofs_oi_truncate(struct exofs_i_info *oi, u64 new_len);
197 static inline int exofs_oi_write(struct exofs_i_info *oi,
198 struct exofs_io_state *ios)
200 ios->obj.id = exofs_oi_objno(oi);
201 ios->cred = oi->i_cred;
202 return exofs_sbi_write(ios);
205 static inline int exofs_oi_read(struct exofs_i_info *oi,
206 struct exofs_io_state *ios)
208 ios->obj.id = exofs_oi_objno(oi);
209 ios->cred = oi->i_cred;
210 return exofs_sbi_read(ios);
214 void exofs_truncate(struct inode *inode);
215 int exofs_setattr(struct dentry *, struct iattr *);
216 int exofs_write_begin(struct file *file, struct address_space *mapping,
217 loff_t pos, unsigned len, unsigned flags,
218 struct page **pagep, void **fsdata);
219 extern struct inode *exofs_iget(struct super_block *, unsigned long);
220 struct inode *exofs_new_inode(struct inode *, int);
221 extern int exofs_write_inode(struct inode *, int);
222 extern void exofs_delete_inode(struct inode *);
225 int exofs_add_link(struct dentry *, struct inode *);
226 ino_t exofs_inode_by_name(struct inode *, struct dentry *);
227 int exofs_delete_entry(struct exofs_dir_entry *, struct page *);
228 int exofs_make_empty(struct inode *, struct inode *);
229 struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *,
231 int exofs_empty_dir(struct inode *);
232 struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **);
233 ino_t exofs_parent_ino(struct dentry *child);
234 int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *,
238 int exofs_sync_fs(struct super_block *sb, int wait);
240 /*********************
241 * operation vectors *
242 *********************/
244 extern const struct file_operations exofs_dir_operations;
247 extern const struct inode_operations exofs_file_inode_operations;
248 extern const struct file_operations exofs_file_operations;
251 extern const struct address_space_operations exofs_aops;
252 extern const struct osd_attr g_attr_logical_length;
255 extern const struct inode_operations exofs_dir_inode_operations;
256 extern const struct inode_operations exofs_special_inode_operations;
259 extern const struct inode_operations exofs_symlink_inode_operations;
260 extern const struct inode_operations exofs_fast_symlink_inode_operations;