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

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