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TOMOYO Linux Cross Reference
Linux/fs/exofs/exofs.h

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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 struct exofs_dev {
 57         struct ore_dev ored;
 58         unsigned did;
 59         unsigned urilen;
 60         uint8_t *uri;
 61         struct kobject ed_kobj;
 62 };
 63 /*
 64  * our extension to the in-memory superblock
 65  */
 66 struct exofs_sb_info {
 67         struct backing_dev_info bdi;            /* register our bdi with VFS  */
 68         struct exofs_sb_stats s_ess;            /* Written often, pre-allocate*/
 69         int             s_timeout;              /* timeout for OSD operations */
 70         uint64_t        s_nextid;               /* highest object ID used     */
 71         uint32_t        s_numfiles;             /* number of files on fs      */
 72         spinlock_t      s_next_gen_lock;        /* spinlock for gen # update  */
 73         u32             s_next_generation;      /* next gen # to use          */
 74         atomic_t        s_curr_pending;         /* number of pending commands */
 75 
 76         struct ore_layout       layout;         /* Default files layout       */
 77         struct ore_comp one_comp;               /* id & cred of partition id=0*/
 78         struct ore_components oc;               /* comps for the partition    */
 79         struct kobject  s_kobj;                 /* holds per-sbi kobject      */
 80 };
 81 
 82 /*
 83  * our extension to the in-memory inode
 84  */
 85 struct exofs_i_info {
 86         struct inode   vfs_inode;          /* normal in-memory inode          */
 87         wait_queue_head_t i_wq;            /* wait queue for inode            */
 88         unsigned long  i_flags;            /* various atomic flags            */
 89         uint32_t       i_data[EXOFS_IDATA];/*short symlink names and device #s*/
 90         uint32_t       i_dir_start_lookup; /* which page to start lookup      */
 91         uint64_t       i_commit_size;      /* the object's written length     */
 92         struct ore_comp one_comp;          /* same component for all devices  */
 93         struct ore_components oc;          /* inode view of the device table  */
 94 };
 95 
 96 static inline osd_id exofs_oi_objno(struct exofs_i_info *oi)
 97 {
 98         return oi->vfs_inode.i_ino + EXOFS_OBJ_OFF;
 99 }
100 
101 /*
102  * our inode flags
103  */
104 #define OBJ_2BCREATED   0       /* object will be created soon*/
105 #define OBJ_CREATED     1       /* object has been created on the osd*/
106 
107 static inline int obj_2bcreated(struct exofs_i_info *oi)
108 {
109         return test_bit(OBJ_2BCREATED, &oi->i_flags);
110 }
111 
112 static inline void set_obj_2bcreated(struct exofs_i_info *oi)
113 {
114         set_bit(OBJ_2BCREATED, &oi->i_flags);
115 }
116 
117 static inline int obj_created(struct exofs_i_info *oi)
118 {
119         return test_bit(OBJ_CREATED, &oi->i_flags);
120 }
121 
122 static inline void set_obj_created(struct exofs_i_info *oi)
123 {
124         set_bit(OBJ_CREATED, &oi->i_flags);
125 }
126 
127 int __exofs_wait_obj_created(struct exofs_i_info *oi);
128 static inline int wait_obj_created(struct exofs_i_info *oi)
129 {
130         if (likely(obj_created(oi)))
131                 return 0;
132 
133         return __exofs_wait_obj_created(oi);
134 }
135 
136 /*
137  * get to our inode from the vfs inode
138  */
139 static inline struct exofs_i_info *exofs_i(struct inode *inode)
140 {
141         return container_of(inode, struct exofs_i_info, vfs_inode);
142 }
143 
144 /*
145  * Maximum count of links to a file
146  */
147 #define EXOFS_LINK_MAX           32000
148 
149 /*************************
150  * function declarations *
151  *************************/
152 
153 /* inode.c               */
154 unsigned exofs_max_io_pages(struct ore_layout *layout,
155                             unsigned expected_pages);
156 int exofs_setattr(struct dentry *, struct iattr *);
157 int exofs_write_begin(struct file *file, struct address_space *mapping,
158                 loff_t pos, unsigned len, unsigned flags,
159                 struct page **pagep, void **fsdata);
160 extern struct inode *exofs_iget(struct super_block *, unsigned long);
161 struct inode *exofs_new_inode(struct inode *, umode_t);
162 extern int exofs_write_inode(struct inode *, struct writeback_control *wbc);
163 extern void exofs_evict_inode(struct inode *);
164 
165 /* dir.c:                */
166 int exofs_add_link(struct dentry *, struct inode *);
167 ino_t exofs_inode_by_name(struct inode *, struct dentry *);
168 int exofs_delete_entry(struct exofs_dir_entry *, struct page *);
169 int exofs_make_empty(struct inode *, struct inode *);
170 struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *,
171                                          struct page **);
172 int exofs_empty_dir(struct inode *);
173 struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **);
174 ino_t exofs_parent_ino(struct dentry *child);
175 int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *,
176                     struct inode *);
177 
178 /* super.c               */
179 void exofs_make_credential(u8 cred_a[OSD_CAP_LEN],
180                            const struct osd_obj_id *obj);
181 int exofs_sbi_write_stats(struct exofs_sb_info *sbi);
182 
183 /* sys.c                 */
184 int exofs_sysfs_init(void);
185 void exofs_sysfs_uninit(void);
186 int exofs_sysfs_sb_add(struct exofs_sb_info *sbi,
187                        struct exofs_dt_device_info *dt_dev);
188 void exofs_sysfs_sb_del(struct exofs_sb_info *sbi);
189 int exofs_sysfs_odev_add(struct exofs_dev *edev,
190                          struct exofs_sb_info *sbi);
191 void exofs_sysfs_dbg_print(void);
192 
193 /*********************
194  * operation vectors *
195  *********************/
196 /* dir.c:            */
197 extern const struct file_operations exofs_dir_operations;
198 
199 /* file.c            */
200 extern const struct inode_operations exofs_file_inode_operations;
201 extern const struct file_operations exofs_file_operations;
202 
203 /* inode.c           */
204 extern const struct address_space_operations exofs_aops;
205 
206 /* namei.c           */
207 extern const struct inode_operations exofs_dir_inode_operations;
208 extern const struct inode_operations exofs_special_inode_operations;
209 
210 /* symlink.c         */
211 extern const struct inode_operations exofs_symlink_inode_operations;
212 extern const struct inode_operations exofs_fast_symlink_inode_operations;
213 
214 /* exofs_init_comps will initialize an ore_components device array
215  * pointing to a single ore_comp struct, and a round-robin view
216  * of the device table.
217  * The first device of each inode is the [inode->ino % num_devices]
218  * and the rest of the devices sequentially following where the
219  * first device is after the last device.
220  * It is assumed that the global device array at @sbi is twice
221  * bigger and that the device table repeats twice.
222  * See: exofs_read_lookup_dev_table()
223  */
224 static inline void exofs_init_comps(struct ore_components *oc,
225                                     struct ore_comp *one_comp,
226                                     struct exofs_sb_info *sbi, osd_id oid)
227 {
228         unsigned dev_mod = (unsigned)oid, first_dev;
229 
230         one_comp->obj.partition = sbi->one_comp.obj.partition;
231         one_comp->obj.id = oid;
232         exofs_make_credential(one_comp->cred, &one_comp->obj);
233 
234         oc->first_dev = 0;
235         oc->numdevs = sbi->layout.group_width * sbi->layout.mirrors_p1 *
236                                                         sbi->layout.group_count;
237         oc->single_comp = EC_SINGLE_COMP;
238         oc->comps = one_comp;
239 
240         /* Round robin device view of the table */
241         first_dev = (dev_mod * sbi->layout.mirrors_p1) % sbi->oc.numdevs;
242         oc->ods = &sbi->oc.ods[first_dev];
243 }
244 
245 #endif
246 

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