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-rw-r--r--fs/nilfs2/nilfs.h323
-rw-r--r--fs/nilfs2/sb.h102
-rw-r--r--fs/nilfs2/the_nilfs.h290
3 files changed, 715 insertions, 0 deletions
diff --git a/fs/nilfs2/nilfs.h b/fs/nilfs2/nilfs.h
new file mode 100644
index 000000000000..17458ad4a809
--- /dev/null
+++ b/fs/nilfs2/nilfs.h
@@ -0,0 +1,323 @@
1/*
2 * nilfs.h - NILFS local header file.
3 *
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Written by Koji Sato <koji@osrg.net>
21 * Ryusuke Konishi <ryusuke@osrg.net>
22 */
23
24#ifndef _NILFS_H
25#define _NILFS_H
26
27#include <linux/kernel.h>
28#include <linux/buffer_head.h>
29#include <linux/spinlock.h>
30#include <linux/blkdev.h>
31#include <linux/nilfs2_fs.h>
32#include "the_nilfs.h"
33#include "sb.h"
34#include "bmap.h"
35#include "bmap_union.h"
36
37/*
38 * NILFS filesystem version
39 */
40#define NILFS_VERSION "2.0.5"
41
42/*
43 * nilfs inode data in memory
44 */
45struct nilfs_inode_info {
46 __u32 i_flags;
47 unsigned long i_state; /* Dynamic state flags */
48 struct nilfs_bmap *i_bmap;
49 union nilfs_bmap_union i_bmap_union;
50 __u64 i_xattr; /* sector_t ??? */
51 __u32 i_dtime;
52 __u32 i_dir_start_lookup;
53 __u64 i_cno; /* check point number for GC inode */
54 struct address_space i_btnode_cache;
55 struct list_head i_dirty; /* List for connecting dirty files */
56
57#ifdef CONFIG_NILFS_XATTR
58 /*
59 * Extended attributes can be read independently of the main file
60 * data. Taking i_sem even when reading would cause contention
61 * between readers of EAs and writers of regular file data, so
62 * instead we synchronize on xattr_sem when reading or changing
63 * EAs.
64 */
65 struct rw_semaphore xattr_sem;
66#endif
67#ifdef CONFIG_NILFS_POSIX_ACL
68 struct posix_acl *i_acl;
69 struct posix_acl *i_default_acl;
70#endif
71 struct buffer_head *i_bh; /* i_bh contains a new or dirty
72 disk inode */
73 struct inode vfs_inode;
74};
75
76static inline struct nilfs_inode_info *NILFS_I(const struct inode *inode)
77{
78 return container_of(inode, struct nilfs_inode_info, vfs_inode);
79}
80
81static inline struct nilfs_inode_info *
82NILFS_BMAP_I(const struct nilfs_bmap *bmap)
83{
84 return container_of((union nilfs_bmap_union *)bmap,
85 struct nilfs_inode_info,
86 i_bmap_union);
87}
88
89static inline struct inode *NILFS_BTNC_I(struct address_space *btnc)
90{
91 struct nilfs_inode_info *ii =
92 container_of(btnc, struct nilfs_inode_info, i_btnode_cache);
93 return &ii->vfs_inode;
94}
95
96static inline struct inode *NILFS_AS_I(struct address_space *mapping)
97{
98 return (mapping->host) ? :
99 container_of(mapping, struct inode, i_data);
100}
101
102/*
103 * Dynamic state flags of NILFS on-memory inode (i_state)
104 */
105enum {
106 NILFS_I_NEW = 0, /* Inode is newly created */
107 NILFS_I_DIRTY, /* The file is dirty */
108 NILFS_I_QUEUED, /* inode is in dirty_files list */
109 NILFS_I_BUSY, /* inode is grabbed by a segment
110 constructor */
111 NILFS_I_COLLECTED, /* All dirty blocks are collected */
112 NILFS_I_UPDATED, /* The file has been written back */
113 NILFS_I_INODE_DIRTY, /* write_inode is requested */
114 NILFS_I_BMAP, /* has bmap and btnode_cache */
115 NILFS_I_GCINODE, /* inode for GC, on memory only */
116 NILFS_I_GCDAT, /* shadow DAT, on memory only */
117};
118
119/*
120 * Macros to check inode numbers
121 */
122#define NILFS_MDT_INO_BITS \
123 ((unsigned int)(1 << NILFS_DAT_INO | 1 << NILFS_CPFILE_INO | \
124 1 << NILFS_SUFILE_INO | 1 << NILFS_IFILE_INO | \
125 1 << NILFS_ATIME_INO | 1 << NILFS_SKETCH_INO))
126
127#define NILFS_SYS_INO_BITS \
128 ((unsigned int)(1 << NILFS_ROOT_INO) | NILFS_MDT_INO_BITS)
129
130#define NILFS_FIRST_INO(sb) (NILFS_SB(sb)->s_nilfs->ns_first_ino)
131
132#define NILFS_MDT_INODE(sb, ino) \
133 ((ino) < NILFS_FIRST_INO(sb) && (NILFS_MDT_INO_BITS & (1 << (ino))))
134#define NILFS_VALID_INODE(sb, ino) \
135 ((ino) >= NILFS_FIRST_INO(sb) || (NILFS_SYS_INO_BITS & (1 << (ino))))
136
137/**
138 * struct nilfs_transaction_info: context information for synchronization
139 * @ti_magic: Magic number
140 * @ti_save: Backup of journal_info field of task_struct
141 * @ti_flags: Flags
142 * @ti_count: Nest level
143 * @ti_garbage: List of inode to be put when releasing semaphore
144 */
145struct nilfs_transaction_info {
146 u32 ti_magic;
147 void *ti_save;
148 /* This should never used. If this happens,
149 one of other filesystems has a bug. */
150 unsigned short ti_flags;
151 unsigned short ti_count;
152 struct list_head ti_garbage;
153};
154
155/* ti_magic */
156#define NILFS_TI_MAGIC 0xd9e392fb
157
158/* ti_flags */
159#define NILFS_TI_DYNAMIC_ALLOC 0x0001 /* Allocated from slab */
160#define NILFS_TI_SYNC 0x0002 /* Force to construct segment at the
161 end of transaction. */
162#define NILFS_TI_GC 0x0004 /* GC context */
163#define NILFS_TI_COMMIT 0x0008 /* Change happened or not */
164#define NILFS_TI_WRITER 0x0010 /* Constructor context */
165
166
167int nilfs_transaction_begin(struct super_block *,
168 struct nilfs_transaction_info *, int);
169int nilfs_transaction_end(struct super_block *, int);
170
171static inline void nilfs_set_transaction_flag(unsigned int flag)
172{
173 struct nilfs_transaction_info *ti = current->journal_info;
174
175 BUG_ON(!ti);
176 ti->ti_flags |= flag;
177}
178
179static inline int nilfs_test_transaction_flag(unsigned int flag)
180{
181 struct nilfs_transaction_info *ti = current->journal_info;
182
183 if (ti == NULL || ti->ti_magic != NILFS_TI_MAGIC)
184 return 0;
185 return !!(ti->ti_flags & flag);
186}
187
188static inline int nilfs_doing_gc(void)
189{
190 return nilfs_test_transaction_flag(NILFS_TI_GC);
191}
192
193static inline int nilfs_doing_construction(void)
194{
195 return nilfs_test_transaction_flag(NILFS_TI_WRITER);
196}
197
198static inline struct inode *nilfs_dat_inode(const struct the_nilfs *nilfs)
199{
200 return nilfs_doing_gc() ? nilfs->ns_gc_dat : nilfs->ns_dat;
201}
202
203/*
204 * function prototype
205 */
206#ifdef CONFIG_NILFS_POSIX_ACL
207#error "NILFS: not yet supported POSIX ACL"
208extern int nilfs_permission(struct inode *, int, struct nameidata *);
209extern int nilfs_acl_chmod(struct inode *);
210extern int nilfs_init_acl(struct inode *, struct inode *);
211#else
212#define nilfs_permission NULL
213
214static inline int nilfs_acl_chmod(struct inode *inode)
215{
216 return 0;
217}
218
219static inline int nilfs_init_acl(struct inode *inode, struct inode *dir)
220{
221 inode->i_mode &= ~current_umask();
222 return 0;
223}
224#endif
225
226#define NILFS_ATIME_DISABLE
227
228/* dir.c */
229extern int nilfs_add_link(struct dentry *, struct inode *);
230extern ino_t nilfs_inode_by_name(struct inode *, struct dentry *);
231extern int nilfs_make_empty(struct inode *, struct inode *);
232extern struct nilfs_dir_entry *
233nilfs_find_entry(struct inode *, struct dentry *, struct page **);
234extern int nilfs_delete_entry(struct nilfs_dir_entry *, struct page *);
235extern int nilfs_empty_dir(struct inode *);
236extern struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct page **);
237extern void nilfs_set_link(struct inode *, struct nilfs_dir_entry *,
238 struct page *, struct inode *);
239
240/* file.c */
241extern int nilfs_sync_file(struct file *, struct dentry *, int);
242
243/* ioctl.c */
244int nilfs_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
245long nilfs_compat_ioctl(struct file *, unsigned int, unsigned long);
246int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, void __user *);
247
248/* inode.c */
249extern struct inode *nilfs_new_inode(struct inode *, int);
250extern void nilfs_free_inode(struct inode *);
251extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
252extern void nilfs_set_inode_flags(struct inode *);
253extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *);
254extern void nilfs_write_inode_common(struct inode *, struct nilfs_inode *, int);
255extern struct inode *nilfs_iget(struct super_block *, unsigned long);
256extern void nilfs_update_inode(struct inode *, struct buffer_head *);
257extern void nilfs_truncate(struct inode *);
258extern void nilfs_delete_inode(struct inode *);
259extern int nilfs_setattr(struct dentry *, struct iattr *);
260extern int nilfs_load_inode_block(struct nilfs_sb_info *, struct inode *,
261 struct buffer_head **);
262extern int nilfs_inode_dirty(struct inode *);
263extern int nilfs_set_file_dirty(struct nilfs_sb_info *, struct inode *,
264 unsigned);
265extern int nilfs_mark_inode_dirty(struct inode *);
266extern void nilfs_dirty_inode(struct inode *);
267
268/* namei.c */
269extern struct dentry *nilfs_get_parent(struct dentry *);
270
271/* super.c */
272extern struct inode *nilfs_alloc_inode(struct super_block *);
273extern void nilfs_destroy_inode(struct inode *);
274extern void nilfs_error(struct super_block *, const char *, const char *, ...)
275 __attribute__ ((format (printf, 3, 4)));
276extern void nilfs_warning(struct super_block *, const char *, const char *, ...)
277 __attribute__ ((format (printf, 3, 4)));
278extern struct nilfs_super_block *
279nilfs_load_super_block(struct super_block *, struct buffer_head **);
280extern struct nilfs_super_block *
281nilfs_reload_super_block(struct super_block *, struct buffer_head **, int);
282extern int nilfs_store_magic_and_option(struct super_block *,
283 struct nilfs_super_block *, char *);
284extern void nilfs_update_last_segment(struct nilfs_sb_info *, int);
285extern int nilfs_commit_super(struct nilfs_sb_info *);
286extern int nilfs_attach_checkpoint(struct nilfs_sb_info *, __u64);
287extern void nilfs_detach_checkpoint(struct nilfs_sb_info *);
288
289/* gcinode.c */
290int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64,
291 struct buffer_head **);
292int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64,
293 struct buffer_head **);
294int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *);
295int nilfs_init_gccache(struct the_nilfs *);
296void nilfs_destroy_gccache(struct the_nilfs *);
297void nilfs_clear_gcinode(struct inode *);
298struct inode *nilfs_gc_iget(struct the_nilfs *, ino_t, __u64);
299void nilfs_remove_all_gcinode(struct the_nilfs *);
300
301/* gcdat.c */
302int nilfs_init_gcdat_inode(struct the_nilfs *);
303void nilfs_commit_gcdat_inode(struct the_nilfs *);
304void nilfs_clear_gcdat_inode(struct the_nilfs *);
305
306/*
307 * Inodes and files operations
308 */
309extern struct file_operations nilfs_dir_operations;
310extern struct inode_operations nilfs_file_inode_operations;
311extern struct file_operations nilfs_file_operations;
312extern struct address_space_operations nilfs_aops;
313extern struct inode_operations nilfs_dir_inode_operations;
314extern struct inode_operations nilfs_special_inode_operations;
315extern struct inode_operations nilfs_symlink_inode_operations;
316
317/*
318 * filesystem type
319 */
320extern struct file_system_type nilfs_fs_type;
321
322
323#endif /* _NILFS_H */
diff --git a/fs/nilfs2/sb.h b/fs/nilfs2/sb.h
new file mode 100644
index 000000000000..adccd4fc654e
--- /dev/null
+++ b/fs/nilfs2/sb.h
@@ -0,0 +1,102 @@
1/*
2 * sb.h - NILFS on-memory super block structure.
3 *
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Written by Ryusuke Konishi <ryusuke@osrg.net>
21 *
22 */
23
24#ifndef _NILFS_SB
25#define _NILFS_SB
26
27#include <linux/types.h>
28#include <linux/fs.h>
29
30/*
31 * Mount options
32 */
33struct nilfs_mount_options {
34 unsigned long mount_opt;
35 __u64 snapshot_cno;
36};
37
38struct the_nilfs;
39struct nilfs_sc_info;
40
41/*
42 * NILFS super-block data in memory
43 */
44struct nilfs_sb_info {
45 /* Snapshot status */
46 __u64 s_snapshot_cno; /* Checkpoint number */
47 atomic_t s_inodes_count;
48 atomic_t s_blocks_count; /* Reserved (might be deleted) */
49
50 /* Mount options */
51 unsigned long s_mount_opt;
52 uid_t s_resuid;
53 gid_t s_resgid;
54
55 unsigned long s_interval; /* construction interval */
56 unsigned long s_watermark; /* threshold of data amount
57 for the segment construction */
58
59 /* Fundamental members */
60 struct super_block *s_super; /* reverse pointer to super_block */
61 struct the_nilfs *s_nilfs;
62 struct list_head s_list; /* list head for nilfs->ns_supers */
63
64 /* Segment constructor */
65 struct list_head s_dirty_files; /* dirty files list */
66 struct nilfs_sc_info *s_sc_info; /* segment constructor info */
67 spinlock_t s_inode_lock; /* Lock for the nilfs inode.
68 It covers s_dirty_files list */
69
70 /* Metadata files */
71 struct inode *s_ifile; /* index file inode */
72
73 /* Inode allocator */
74 spinlock_t s_next_gen_lock;
75 u32 s_next_generation;
76};
77
78static inline struct nilfs_sb_info *NILFS_SB(struct super_block *sb)
79{
80 return sb->s_fs_info;
81}
82
83static inline struct nilfs_sc_info *NILFS_SC(struct nilfs_sb_info *sbi)
84{
85 return sbi->s_sc_info;
86}
87
88/*
89 * Bit operations for the mount option
90 */
91#define nilfs_clear_opt(sbi, opt) \
92 do { (sbi)->s_mount_opt &= ~NILFS_MOUNT_##opt; } while (0)
93#define nilfs_set_opt(sbi, opt) \
94 do { (sbi)->s_mount_opt |= NILFS_MOUNT_##opt; } while (0)
95#define nilfs_test_opt(sbi, opt) ((sbi)->s_mount_opt & NILFS_MOUNT_##opt)
96#define nilfs_write_opt(sbi, mask, opt) \
97 do { (sbi)->s_mount_opt = \
98 (((sbi)->s_mount_opt & ~NILFS_MOUNT_##mask) | \
99 NILFS_MOUNT_##opt); \
100 } while (0)
101
102#endif /* _NILFS_SB */
diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h
new file mode 100644
index 000000000000..dee8d83e0549
--- /dev/null
+++ b/fs/nilfs2/the_nilfs.h
@@ -0,0 +1,290 @@
1/*
2 * the_nilfs.h - the_nilfs shared structure.
3 *
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Written by Ryusuke Konishi <ryusuke@osrg.net>
21 *
22 */
23
24#ifndef _THE_NILFS_H
25#define _THE_NILFS_H
26
27#include <linux/types.h>
28#include <linux/buffer_head.h>
29#include <linux/fs.h>
30#include <linux/blkdev.h>
31#include <linux/backing-dev.h>
32#include "sb.h"
33
34/* the_nilfs struct */
35enum {
36 THE_NILFS_INIT = 0, /* Information from super_block is set */
37 THE_NILFS_LOADED, /* Roll-back/roll-forward has done and
38 the latest checkpoint was loaded */
39 THE_NILFS_DISCONTINUED, /* 'next' pointer chain has broken */
40 THE_NILFS_COND_NONGC_WRITE, /* Condition to wake up cleanerd */
41};
42
43/**
44 * struct the_nilfs - struct to supervise multiple nilfs mount points
45 * @ns_flags: flags
46 * @ns_count: reference count
47 * @ns_bdev: block device
48 * @ns_bdi: backing dev info
49 * @ns_writer: back pointer to writable nilfs_sb_info
50 * @ns_sem: semaphore for shared states
51 * @ns_writer_mutex: mutex protecting ns_writer attach/detach
52 * @ns_writer_refcount: number of referrers on ns_writer
53 * @ns_sbh: buffer head of the on-disk super block
54 * @ns_sbp: pointer to the super block data
55 * @ns_used_segments: list of full segments in volatile active state
56 * @ns_supers: list of nilfs super block structs
57 * @ns_seg_seq: segment sequence counter
58 * @ns_segnum: index number of the latest full segment.
59 * @ns_nextnum: index number of the full segment index to be used next
60 * @ns_pseg_offset: offset of next partial segment in the current full segment
61 * @ns_cno: next checkpoint number
62 * @ns_ctime: write time of the last segment
63 * @ns_nongc_ctime: write time of the last segment not for cleaner operation
64 * @ns_ndirtyblks: Number of dirty data blocks
65 * @ns_last_segment_lock: lock protecting fields for the latest segment
66 * @ns_last_pseg: start block number of the latest segment
67 * @ns_last_seq: sequence value of the latest segment
68 * @ns_last_cno: checkpoint number of the latest segment
69 * @ns_free_segments_count: counter of free segments
70 * @ns_segctor_sem: segment constructor semaphore
71 * @ns_dat: DAT file inode
72 * @ns_cpfile: checkpoint file inode
73 * @ns_sufile: segusage file inode
74 * @ns_gc_dat: shadow inode of the DAT file inode for GC
75 * @ns_gc_inodes: dummy inodes to keep live blocks
76 * @ns_gc_inodes_h: hash list to keep dummy inode holding live blocks
77 * @ns_cleanerd_wq: wait queue for cleanerd
78 * @ns_blocksize_bits: bit length of block size
79 * @ns_nsegments: number of segments in filesystem
80 * @ns_blocks_per_segment: number of blocks per segment
81 * @ns_r_segments_percentage: reserved segments percentage
82 * @ns_nrsvsegs: number of reserved segments
83 * @ns_first_data_block: block number of first data block
84 * @ns_inode_size: size of on-disk inode
85 * @ns_first_ino: first not-special inode number
86 * @ns_crc_seed: seed value of CRC32 calculation
87 */
88struct the_nilfs {
89 unsigned long ns_flags;
90 atomic_t ns_count;
91
92 struct block_device *ns_bdev;
93 struct backing_dev_info *ns_bdi;
94 struct nilfs_sb_info *ns_writer;
95 struct rw_semaphore ns_sem;
96 struct mutex ns_writer_mutex;
97 atomic_t ns_writer_refcount;
98
99 /*
100 * used for
101 * - loading the latest checkpoint exclusively.
102 * - allocating a new full segment.
103 * - protecting s_dirt in the super_block struct
104 * (see nilfs_write_super) and the following fields.
105 */
106 struct buffer_head *ns_sbh;
107 struct nilfs_super_block *ns_sbp;
108 struct list_head ns_used_segments;
109 unsigned ns_mount_state;
110 struct list_head ns_supers;
111
112 /*
113 * Following fields are dedicated to a writable FS-instance.
114 * Except for the period seeking checkpoint, code outside the segment
115 * constructor must lock a segment semaphore with transaction_begin()
116 * and transaction_end(), when accessing these fields.
117 * The writable FS-instance is sole during a lifetime of the_nilfs.
118 */
119 u64 ns_seg_seq;
120 __u64 ns_segnum;
121 __u64 ns_nextnum;
122 unsigned long ns_pseg_offset;
123 __u64 ns_cno;
124 time_t ns_ctime;
125 time_t ns_nongc_ctime;
126 atomic_t ns_ndirtyblks;
127
128 /*
129 * The following fields hold information on the latest partial segment
130 * written to disk with a super root. These fields are protected by
131 * ns_last_segment_lock.
132 */
133 spinlock_t ns_last_segment_lock;
134 sector_t ns_last_pseg;
135 u64 ns_last_seq;
136 __u64 ns_last_cno;
137 unsigned long ns_free_segments_count;
138
139 struct rw_semaphore ns_segctor_sem;
140
141 /*
142 * Following fields are lock free except for the period before
143 * the_nilfs is initialized.
144 */
145 struct inode *ns_dat;
146 struct inode *ns_cpfile;
147 struct inode *ns_sufile;
148 struct inode *ns_gc_dat;
149
150 /* GC inode list and hash table head */
151 struct list_head ns_gc_inodes;
152 struct hlist_head *ns_gc_inodes_h;
153
154 /* cleanerd */
155 wait_queue_head_t ns_cleanerd_wq;
156
157 /* Disk layout information (static) */
158 unsigned int ns_blocksize_bits;
159 unsigned long ns_nsegments;
160 unsigned long ns_blocks_per_segment;
161 unsigned long ns_r_segments_percentage;
162 unsigned long ns_nrsvsegs;
163 unsigned long ns_first_data_block;
164 int ns_inode_size;
165 int ns_first_ino;
166 u32 ns_crc_seed;
167};
168
169#define NILFS_GCINODE_HASH_BITS 8
170#define NILFS_GCINODE_HASH_SIZE (1<<NILFS_GCINODE_HASH_BITS)
171
172#define THE_NILFS_FNS(bit, name) \
173static inline void set_nilfs_##name(struct the_nilfs *nilfs) \
174{ \
175 set_bit(THE_NILFS_##bit, &(nilfs)->ns_flags); \
176} \
177static inline void clear_nilfs_##name(struct the_nilfs *nilfs) \
178{ \
179 clear_bit(THE_NILFS_##bit, &(nilfs)->ns_flags); \
180} \
181static inline int nilfs_##name(struct the_nilfs *nilfs) \
182{ \
183 return test_bit(THE_NILFS_##bit, &(nilfs)->ns_flags); \
184}
185
186THE_NILFS_FNS(INIT, init)
187THE_NILFS_FNS(LOADED, loaded)
188THE_NILFS_FNS(DISCONTINUED, discontinued)
189THE_NILFS_FNS(COND_NONGC_WRITE, cond_nongc_write)
190
191void nilfs_set_last_segment(struct the_nilfs *, sector_t, u64, __u64);
192struct the_nilfs *alloc_nilfs(struct block_device *);
193void put_nilfs(struct the_nilfs *);
194int init_nilfs(struct the_nilfs *, struct nilfs_sb_info *, char *);
195int load_nilfs(struct the_nilfs *, struct nilfs_sb_info *);
196int nilfs_count_free_blocks(struct the_nilfs *, sector_t *);
197void nilfs_dispose_used_segments(struct the_nilfs *);
198int nilfs_checkpoint_is_mounted(struct the_nilfs *, __u64, int);
199int nilfs_near_disk_full(struct the_nilfs *);
200
201
202static inline void get_nilfs(struct the_nilfs *nilfs)
203{
204 /* Caller must have at least one reference of the_nilfs. */
205 atomic_inc(&nilfs->ns_count);
206}
207
208static inline struct nilfs_sb_info *nilfs_get_writer(struct the_nilfs *nilfs)
209{
210 if (atomic_inc_and_test(&nilfs->ns_writer_refcount))
211 mutex_lock(&nilfs->ns_writer_mutex);
212 return nilfs->ns_writer;
213}
214
215static inline void nilfs_put_writer(struct the_nilfs *nilfs)
216{
217 if (atomic_add_negative(-1, &nilfs->ns_writer_refcount))
218 mutex_unlock(&nilfs->ns_writer_mutex);
219}
220
221static inline void
222nilfs_attach_writer(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi)
223{
224 mutex_lock(&nilfs->ns_writer_mutex);
225 nilfs->ns_writer = sbi;
226 mutex_unlock(&nilfs->ns_writer_mutex);
227}
228
229static inline void
230nilfs_detach_writer(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi)
231{
232 mutex_lock(&nilfs->ns_writer_mutex);
233 if (sbi == nilfs->ns_writer)
234 nilfs->ns_writer = NULL;
235 mutex_unlock(&nilfs->ns_writer_mutex);
236}
237
238static inline void
239nilfs_get_segment_range(struct the_nilfs *nilfs, __u64 segnum,
240 sector_t *seg_start, sector_t *seg_end)
241{
242 *seg_start = (sector_t)nilfs->ns_blocks_per_segment * segnum;
243 *seg_end = *seg_start + nilfs->ns_blocks_per_segment - 1;
244 if (segnum == 0)
245 *seg_start = nilfs->ns_first_data_block;
246}
247
248static inline sector_t
249nilfs_get_segment_start_blocknr(struct the_nilfs *nilfs, __u64 segnum)
250{
251 return (segnum == 0) ? nilfs->ns_first_data_block :
252 (sector_t)nilfs->ns_blocks_per_segment * segnum;
253}
254
255static inline __u64
256nilfs_get_segnum_of_block(struct the_nilfs *nilfs, sector_t blocknr)
257{
258 sector_t segnum = blocknr;
259
260 sector_div(segnum, nilfs->ns_blocks_per_segment);
261 return segnum;
262}
263
264static inline void
265nilfs_terminate_segment(struct the_nilfs *nilfs, sector_t seg_start,
266 sector_t seg_end)
267{
268 /* terminate the current full segment (used in case of I/O-error) */
269 nilfs->ns_pseg_offset = seg_end - seg_start + 1;
270}
271
272static inline void nilfs_shift_to_next_segment(struct the_nilfs *nilfs)
273{
274 /* move forward with a full segment */
275 nilfs->ns_segnum = nilfs->ns_nextnum;
276 nilfs->ns_pseg_offset = 0;
277 nilfs->ns_seg_seq++;
278}
279
280static inline __u64 nilfs_last_cno(struct the_nilfs *nilfs)
281{
282 __u64 cno;
283
284 spin_lock(&nilfs->ns_last_segment_lock);
285 cno = nilfs->ns_last_cno;
286 spin_unlock(&nilfs->ns_last_segment_lock);
287 return cno;
288}
289
290#endif /* _THE_NILFS_H */
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-05 01:43:05 -0500