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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 */
Boaz Harrosh06886a52009-11-08 14:54:08 +020033#ifndef __EXOFS_H__
34#define __EXOFS_H__
Boaz Harroshb14f8ab2008-10-27 18:27:55 +020035
36#include <linux/fs.h>
37#include <linux/time.h>
Jens Axboeb3d0ab72010-04-22 12:26:04 +020038#include <linux/backing-dev.h>
Boaz Harrosh8ff660a2011-08-06 19:26:31 -070039#include <scsi/osd_ore.h>
40
Boaz Harroshb14f8ab2008-10-27 18:27:55 +020041#include "common.h"
42
Boaz Harroshb14f8ab2008-10-27 18:27:55 +020043#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
Boaz Harroshd866d872011-09-28 14:43:09 +030056struct exofs_dev {
57 struct ore_dev ored;
58 unsigned did;
59};
Boaz Harroshb14f8ab2008-10-27 18:27:55 +020060/*
61 * our extension to the in-memory superblock
62 */
63struct exofs_sb_info {
Boaz Harrosh6d4073e2011-07-27 17:51:53 -070064 struct backing_dev_info bdi; /* register our bdi with VFS */
Boaz Harrosh1cea3122011-02-03 17:53:25 +020065 struct exofs_sb_stats s_ess; /* Written often, pre-allocate*/
Boaz Harroshb14f8ab2008-10-27 18:27:55 +020066 int s_timeout; /* timeout for OSD operations */
67 uint64_t s_nextid; /* highest object ID used */
68 uint32_t s_numfiles; /* number of files on fs */
69 spinlock_t s_next_gen_lock; /* spinlock for gen # update */
70 u32 s_next_generation; /* next gen # to use */
71 atomic_t s_curr_pending; /* number of pending commands */
Boaz Harrosh04dc1e82009-11-16 16:03:05 +020072
Boaz Harrosh8ff660a2011-08-06 19:26:31 -070073 struct ore_layout layout; /* Default files layout */
74 struct ore_comp one_comp; /* id & cred of partition id=0*/
Boaz Harrosh5bf696d2011-09-28 11:39:59 +030075 struct ore_components oc; /* comps for the partition */
Boaz Harroshb14f8ab2008-10-27 18:27:55 +020076};
77
78/*
79 * our extension to the in-memory inode
80 */
81struct exofs_i_info {
Boaz Harrosh518f1672010-01-21 20:00:02 +020082 struct inode vfs_inode; /* normal in-memory inode */
83 wait_queue_head_t i_wq; /* wait queue for inode */
Boaz Harroshb14f8ab2008-10-27 18:27:55 +020084 unsigned long i_flags; /* various atomic flags */
85 uint32_t i_data[EXOFS_IDATA];/*short symlink names and device #s*/
86 uint32_t i_dir_start_lookup; /* which page to start lookup */
Boaz Harroshb14f8ab2008-10-27 18:27:55 +020087 uint64_t i_commit_size; /* the object's written length */
Boaz Harrosh8ff660a2011-08-06 19:26:31 -070088 struct ore_comp one_comp; /* same component for all devices */
Boaz Harrosh5bf696d2011-09-28 11:39:59 +030089 struct ore_components oc; /* inode view of the device table */
Boaz Harroshb14f8ab2008-10-27 18:27:55 +020090};
91
Boaz Harrosh06886a52009-11-08 14:54:08 +020092static inline osd_id exofs_oi_objno(struct exofs_i_info *oi)
93{
94 return oi->vfs_inode.i_ino + EXOFS_OBJ_OFF;
95}
96
Boaz Harroshb14f8ab2008-10-27 18:27:55 +020097/*
98 * our inode flags
99 */
100#define OBJ_2BCREATED 0 /* object will be created soon*/
101#define OBJ_CREATED 1 /* object has been created on the osd*/
102
103static inline int obj_2bcreated(struct exofs_i_info *oi)
104{
105 return test_bit(OBJ_2BCREATED, &oi->i_flags);
106}
107
108static inline void set_obj_2bcreated(struct exofs_i_info *oi)
109{
110 set_bit(OBJ_2BCREATED, &oi->i_flags);
111}
112
113static inline int obj_created(struct exofs_i_info *oi)
114{
115 return test_bit(OBJ_CREATED, &oi->i_flags);
116}
117
118static inline void set_obj_created(struct exofs_i_info *oi)
119{
120 set_bit(OBJ_CREATED, &oi->i_flags);
121}
122
123int __exofs_wait_obj_created(struct exofs_i_info *oi);
124static inline int wait_obj_created(struct exofs_i_info *oi)
125{
126 if (likely(obj_created(oi)))
127 return 0;
128
129 return __exofs_wait_obj_created(oi);
130}
131
132/*
133 * get to our inode from the vfs inode
134 */
135static inline struct exofs_i_info *exofs_i(struct inode *inode)
136{
137 return container_of(inode, struct exofs_i_info, vfs_inode);
138}
139
Boaz Harroshe6af00f2008-10-28 15:38:12 +0200140/*
141 * Maximum count of links to a file
142 */
143#define EXOFS_LINK_MAX 32000
144
Boaz Harroshe8062712008-10-27 18:37:02 +0200145/*************************
146 * function declarations *
147 *************************/
Boaz Harrosh06886a52009-11-08 14:54:08 +0200148
Boaz Harroshe8062712008-10-27 18:37:02 +0200149/* inode.c */
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700150unsigned exofs_max_io_pages(struct ore_layout *layout,
bharrosh@panasas.com66cd6ca2010-10-07 14:28:18 -0400151 unsigned expected_pages);
Boaz Harroshe8062712008-10-27 18:37:02 +0200152int exofs_setattr(struct dentry *, struct iattr *);
Boaz Harroshbeaec072008-10-27 19:31:34 +0200153int exofs_write_begin(struct file *file, struct address_space *mapping,
154 loff_t pos, unsigned len, unsigned flags,
155 struct page **pagep, void **fsdata);
Boaz Harroshe6af00f2008-10-28 15:38:12 +0200156extern struct inode *exofs_iget(struct super_block *, unsigned long);
157struct inode *exofs_new_inode(struct inode *, int);
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100158extern int exofs_write_inode(struct inode *, struct writeback_control *wbc);
Al Viro4ec70c92010-06-07 11:42:26 -0400159extern void exofs_evict_inode(struct inode *);
Boaz Harroshe6af00f2008-10-28 15:38:12 +0200160
161/* dir.c: */
162int exofs_add_link(struct dentry *, struct inode *);
163ino_t exofs_inode_by_name(struct inode *, struct dentry *);
164int exofs_delete_entry(struct exofs_dir_entry *, struct page *);
165int exofs_make_empty(struct inode *, struct inode *);
166struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *,
167 struct page **);
168int exofs_empty_dir(struct inode *);
169struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **);
Boaz Harrosh8cf74b32009-03-22 12:47:26 +0200170ino_t exofs_parent_ino(struct dentry *child);
Boaz Harroshe6af00f2008-10-28 15:38:12 +0200171int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *,
172 struct inode *);
Boaz Harroshe8062712008-10-27 18:37:02 +0200173
Boaz Harroshbaaf94c2009-06-14 16:52:10 +0300174/* super.c */
Boaz Harrosh85e44df2011-05-16 15:26:47 +0300175void exofs_make_credential(u8 cred_a[OSD_CAP_LEN],
176 const struct osd_obj_id *obj);
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200177int exofs_sbi_write_stats(struct exofs_sb_info *sbi);
Boaz Harroshbaaf94c2009-06-14 16:52:10 +0300178
Boaz Harroshe8062712008-10-27 18:37:02 +0200179/*********************
180 * operation vectors *
181 *********************/
Boaz Harroshe6af00f2008-10-28 15:38:12 +0200182/* dir.c: */
183extern const struct file_operations exofs_dir_operations;
184
Boaz Harroshe8062712008-10-27 18:37:02 +0200185/* file.c */
186extern const struct inode_operations exofs_file_inode_operations;
187extern const struct file_operations exofs_file_operations;
188
Boaz Harroshbeaec072008-10-27 19:31:34 +0200189/* inode.c */
190extern const struct address_space_operations exofs_aops;
191
Boaz Harroshe6af00f2008-10-28 15:38:12 +0200192/* namei.c */
193extern const struct inode_operations exofs_dir_inode_operations;
194extern const struct inode_operations exofs_special_inode_operations;
195
Boaz Harrosh982980d2008-10-27 19:04:34 +0200196/* symlink.c */
197extern const struct inode_operations exofs_symlink_inode_operations;
198extern const struct inode_operations exofs_fast_symlink_inode_operations;
199
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700200/* exofs_init_comps will initialize an ore_components device array
201 * pointing to a single ore_comp struct, and a round-robin view
Boaz Harrosh9e9db452011-08-05 15:06:04 -0700202 * of the device table.
203 * The first device of each inode is the [inode->ino % num_devices]
204 * and the rest of the devices sequentially following where the
205 * first device is after the last device.
206 * It is assumed that the global device array at @sbi is twice
207 * bigger and that the device table repeats twice.
208 * See: exofs_read_lookup_dev_table()
209 */
Boaz Harrosh5bf696d2011-09-28 11:39:59 +0300210static inline void exofs_init_comps(struct ore_components *oc,
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700211 struct ore_comp *one_comp,
Boaz Harrosh9e9db452011-08-05 15:06:04 -0700212 struct exofs_sb_info *sbi, osd_id oid)
213{
214 unsigned dev_mod = (unsigned)oid, first_dev;
215
216 one_comp->obj.partition = sbi->one_comp.obj.partition;
217 one_comp->obj.id = oid;
218 exofs_make_credential(one_comp->cred, &one_comp->obj);
219
Boaz Harrosh3bd98562011-09-28 12:04:23 +0300220 oc->first_dev = 0;
Boaz Harroshd866d872011-09-28 14:43:09 +0300221 oc->numdevs = sbi->layout.group_width * sbi->layout.mirrors_p1 *
222 sbi->layout.group_count;
Boaz Harrosh5bf696d2011-09-28 11:39:59 +0300223 oc->single_comp = EC_SINGLE_COMP;
224 oc->comps = one_comp;
Boaz Harrosh9e9db452011-08-05 15:06:04 -0700225
226 /* Round robin device view of the table */
Boaz Harrosh5bf696d2011-09-28 11:39:59 +0300227 first_dev = (dev_mod * sbi->layout.mirrors_p1) % sbi->oc.numdevs;
Boaz Harroshd866d872011-09-28 14:43:09 +0300228 oc->ods = &sbi->oc.ods[first_dev];
Boaz Harrosh9e9db452011-08-05 15:06:04 -0700229}
230
Boaz Harroshb14f8ab2008-10-27 18:27:55 +0200231#endif