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>
38 #include <linux/backing-dev.h>
41 /* FIXME: Remove once pnfs hits mainline
42 * #include <linux/exportfs/pnfs_osd_xdr.h>
46 #define EXOFS_ERR(fmt, a...) printk(KERN_ERR "exofs: " fmt, ##a)
48 #ifdef CONFIG_EXOFS_DEBUG
49 #define EXOFS_DBGMSG(fmt, a...) \
50 printk(KERN_NOTICE "exofs @%s:%d: " fmt, __func__, __LINE__, ##a)
52 #define EXOFS_DBGMSG(fmt, a...) \
53 do { if (0) printk(fmt, ##a); } while (0)
56 /* u64 has problems with printk this will cast it to unsigned long long */
57 #define _LLU(x) (unsigned long long)(x)
60 osd_id s_pid; /* partition ID of file system*/
62 /* Our way of looking at the data_map */
70 enum exofs_inode_layout_gen_functions lay_func;
72 unsigned s_numdevs; /* Num of devices in array */
73 struct osd_dev *s_ods[0]; /* Variable length */
77 * our extension to the in-memory superblock
79 struct exofs_sb_info {
80 struct exofs_fscb s_fscb; /* Written often, pre-allocate*/
81 int s_timeout; /* timeout for OSD operations */
82 uint64_t s_nextid; /* highest object ID used */
83 uint32_t s_numfiles; /* number of files on fs */
84 spinlock_t s_next_gen_lock; /* spinlock for gen # update */
85 u32 s_next_generation; /* next gen # to use */
86 atomic_t s_curr_pending; /* number of pending commands */
87 uint8_t s_cred[OSD_CAP_LEN]; /* credential for the fscb */
88 struct backing_dev_info bdi; /* register our bdi with VFS */
90 struct pnfs_osd_data_map data_map; /* Default raid to use
93 /* struct exofs_layout dir_layout;*/ /* Default dir layout */
94 struct exofs_layout layout; /* Default files layout,
95 * contains the variable osd_dev
97 struct osd_dev *_min_one_dev[1]; /* Place holder for one dev */
101 * our extension to the in-memory inode
103 struct exofs_i_info {
104 struct inode vfs_inode; /* normal in-memory inode */
105 wait_queue_head_t i_wq; /* wait queue for inode */
106 unsigned long i_flags; /* various atomic flags */
107 uint32_t i_data[EXOFS_IDATA];/*short symlink names and device #s*/
108 uint32_t i_dir_start_lookup; /* which page to start lookup */
109 uint64_t i_commit_size; /* the object's written length */
110 uint8_t i_cred[OSD_CAP_LEN];/* all-powerful credential */
113 static inline osd_id exofs_oi_objno(struct exofs_i_info *oi)
115 return oi->vfs_inode.i_ino + EXOFS_OBJ_OFF;
118 struct exofs_io_state;
119 typedef void (*exofs_io_done_fn)(struct exofs_io_state *or, void *private);
121 struct exofs_io_state {
125 exofs_io_done_fn done;
127 struct exofs_layout *layout;
128 struct osd_obj_id obj;
131 /* Global read/write IO*/
133 unsigned long length;
139 unsigned pages_consumed;
142 unsigned in_attr_len;
143 struct osd_attr *in_attr;
144 unsigned out_attr_len;
145 struct osd_attr *out_attr;
147 /* Variable array of size numdevs */
149 struct exofs_per_dev_state {
150 struct osd_request *or;
158 static inline unsigned exofs_io_state_size(unsigned numdevs)
160 return sizeof(struct exofs_io_state) +
161 sizeof(struct exofs_per_dev_state) * numdevs;
167 #define OBJ_2BCREATED 0 /* object will be created soon*/
168 #define OBJ_CREATED 1 /* object has been created on the osd*/
170 static inline int obj_2bcreated(struct exofs_i_info *oi)
172 return test_bit(OBJ_2BCREATED, &oi->i_flags);
175 static inline void set_obj_2bcreated(struct exofs_i_info *oi)
177 set_bit(OBJ_2BCREATED, &oi->i_flags);
180 static inline int obj_created(struct exofs_i_info *oi)
182 return test_bit(OBJ_CREATED, &oi->i_flags);
185 static inline void set_obj_created(struct exofs_i_info *oi)
187 set_bit(OBJ_CREATED, &oi->i_flags);
190 int __exofs_wait_obj_created(struct exofs_i_info *oi);
191 static inline int wait_obj_created(struct exofs_i_info *oi)
193 if (likely(obj_created(oi)))
196 return __exofs_wait_obj_created(oi);
200 * get to our inode from the vfs inode
202 static inline struct exofs_i_info *exofs_i(struct inode *inode)
204 return container_of(inode, struct exofs_i_info, vfs_inode);
208 * Given a layout, object_number and stripe_index return the associated global
211 unsigned exofs_layout_od_id(struct exofs_layout *layout,
212 osd_id obj_no, unsigned layout_index);
214 * Maximum count of links to a file
216 #define EXOFS_LINK_MAX 32000
218 /*************************
219 * function declarations *
220 *************************/
223 void exofs_make_credential(u8 cred_a[OSD_CAP_LEN],
224 const struct osd_obj_id *obj);
225 int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj,
226 u64 offset, void *p, unsigned length);
228 int exofs_get_io_state(struct exofs_layout *layout,
229 struct exofs_io_state **ios);
230 void exofs_put_io_state(struct exofs_io_state *ios);
232 int exofs_check_io(struct exofs_io_state *ios, u64 *resid);
234 int exofs_sbi_create(struct exofs_io_state *ios);
235 int exofs_sbi_remove(struct exofs_io_state *ios);
236 int exofs_sbi_write(struct exofs_io_state *ios);
237 int exofs_sbi_read(struct exofs_io_state *ios);
239 int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr);
241 int exofs_oi_truncate(struct exofs_i_info *oi, u64 new_len);
242 static inline int exofs_oi_write(struct exofs_i_info *oi,
243 struct exofs_io_state *ios)
245 ios->obj.id = exofs_oi_objno(oi);
246 ios->cred = oi->i_cred;
247 return exofs_sbi_write(ios);
250 static inline int exofs_oi_read(struct exofs_i_info *oi,
251 struct exofs_io_state *ios)
253 ios->obj.id = exofs_oi_objno(oi);
254 ios->cred = oi->i_cred;
255 return exofs_sbi_read(ios);
259 int exofs_setattr(struct dentry *, struct iattr *);
260 int exofs_write_begin(struct file *file, struct address_space *mapping,
261 loff_t pos, unsigned len, unsigned flags,
262 struct page **pagep, void **fsdata);
263 extern struct inode *exofs_iget(struct super_block *, unsigned long);
264 struct inode *exofs_new_inode(struct inode *, int);
265 extern int exofs_write_inode(struct inode *, struct writeback_control *wbc);
266 extern void exofs_evict_inode(struct inode *);
269 int exofs_add_link(struct dentry *, struct inode *);
270 ino_t exofs_inode_by_name(struct inode *, struct dentry *);
271 int exofs_delete_entry(struct exofs_dir_entry *, struct page *);
272 int exofs_make_empty(struct inode *, struct inode *);
273 struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *,
275 int exofs_empty_dir(struct inode *);
276 struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **);
277 ino_t exofs_parent_ino(struct dentry *child);
278 int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *,
282 int exofs_sync_fs(struct super_block *sb, int wait);
284 /*********************
285 * operation vectors *
286 *********************/
288 extern const struct file_operations exofs_dir_operations;
291 extern const struct inode_operations exofs_file_inode_operations;
292 extern const struct file_operations exofs_file_operations;
295 extern const struct address_space_operations exofs_aops;
296 extern const struct osd_attr g_attr_logical_length;
299 extern const struct inode_operations exofs_dir_inode_operations;
300 extern const struct inode_operations exofs_special_inode_operations;
303 extern const struct inode_operations exofs_symlink_inode_operations;
304 extern const struct inode_operations exofs_fast_symlink_inode_operations;