Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _BCACHEFS_FS_H
3#define _BCACHEFS_FS_H
4
5#include "inode.h"
6#include "opts.h"
7#include "str_hash.h"
8#include "quota_types.h"
9#include "two_state_shared_lock.h"
10
11#include <linux/seqlock.h>
12#include <linux/stat.h>
13
14struct bch_inode_info {
15 struct inode v;
16 struct rhash_head hash;
17 subvol_inum ei_inum;
18
19 struct list_head ei_vfs_inode_list;
20 unsigned long ei_flags;
21
22 struct mutex ei_update_lock;
23 u64 ei_quota_reserved;
24 unsigned long ei_last_dirtied;
25 two_state_lock_t ei_pagecache_lock;
26
27 struct mutex ei_quota_lock;
28 struct bch_qid ei_qid;
29
30 /*
31 * When we've been doing nocow writes we'll need to issue flushes to the
32 * underlying block devices
33 *
34 * XXX: a device may have had a flush issued by some other codepath. It
35 * would be better to keep for each device a sequence number that's
36 * incremented when we isusue a cache flush, and track here the sequence
37 * number that needs flushing.
38 */
39 struct bch_devs_mask ei_devs_need_flush;
40
41 /* copy of inode in btree: */
42 struct bch_inode_unpacked ei_inode;
43};
44
45#define bch2_pagecache_add_put(i) bch2_two_state_unlock(&i->ei_pagecache_lock, 0)
46#define bch2_pagecache_add_tryget(i) bch2_two_state_trylock(&i->ei_pagecache_lock, 0)
47#define bch2_pagecache_add_get(i) bch2_two_state_lock(&i->ei_pagecache_lock, 0)
48
49#define bch2_pagecache_block_put(i) bch2_two_state_unlock(&i->ei_pagecache_lock, 1)
50#define bch2_pagecache_block_get(i) bch2_two_state_lock(&i->ei_pagecache_lock, 1)
51
52static inline subvol_inum inode_inum(struct bch_inode_info *inode)
53{
54 return inode->ei_inum;
55}
56
57/*
58 * Set if we've gotten a btree error for this inode, and thus the vfs inode and
59 * btree inode may be inconsistent:
60 */
61#define EI_INODE_ERROR 0
62
63/*
64 * Set in the inode is in a snapshot subvolume - we don't do quota accounting in
65 * those:
66 */
67#define EI_INODE_SNAPSHOT 1
68#define EI_INODE_HASHED 2
69
70#define to_bch_ei(_inode) \
71 container_of_or_null(_inode, struct bch_inode_info, v)
72
73static inline int ptrcmp(void *l, void *r)
74{
75 return cmp_int(l, r);
76}
77
78enum bch_inode_lock_op {
79 INODE_PAGECACHE_BLOCK = (1U << 0),
80 INODE_UPDATE_LOCK = (1U << 1),
81};
82
83#define bch2_lock_inodes(_locks, ...) \
84do { \
85 struct bch_inode_info *a[] = { NULL, __VA_ARGS__ }; \
86 unsigned i; \
87 \
88 bubble_sort(&a[1], ARRAY_SIZE(a) - 1, ptrcmp); \
89 \
90 for (i = 1; i < ARRAY_SIZE(a); i++) \
91 if (a[i] != a[i - 1]) { \
92 if ((_locks) & INODE_PAGECACHE_BLOCK) \
93 bch2_pagecache_block_get(a[i]);\
94 if ((_locks) & INODE_UPDATE_LOCK) \
95 mutex_lock_nested(&a[i]->ei_update_lock, i);\
96 } \
97} while (0)
98
99#define bch2_unlock_inodes(_locks, ...) \
100do { \
101 struct bch_inode_info *a[] = { NULL, __VA_ARGS__ }; \
102 unsigned i; \
103 \
104 bubble_sort(&a[1], ARRAY_SIZE(a) - 1, ptrcmp); \
105 \
106 for (i = 1; i < ARRAY_SIZE(a); i++) \
107 if (a[i] != a[i - 1]) { \
108 if ((_locks) & INODE_PAGECACHE_BLOCK) \
109 bch2_pagecache_block_put(a[i]);\
110 if ((_locks) & INODE_UPDATE_LOCK) \
111 mutex_unlock(&a[i]->ei_update_lock); \
112 } \
113} while (0)
114
115static inline struct bch_inode_info *file_bch_inode(struct file *file)
116{
117 return to_bch_ei(file_inode(file));
118}
119
120static inline bool inode_attr_changing(struct bch_inode_info *dir,
121 struct bch_inode_info *inode,
122 enum inode_opt_id id)
123{
124 return !(inode->ei_inode.bi_fields_set & (1 << id)) &&
125 bch2_inode_opt_get(&dir->ei_inode, id) !=
126 bch2_inode_opt_get(&inode->ei_inode, id);
127}
128
129static inline bool inode_attrs_changing(struct bch_inode_info *dir,
130 struct bch_inode_info *inode)
131{
132 unsigned id;
133
134 for (id = 0; id < Inode_opt_nr; id++)
135 if (inode_attr_changing(dir, inode, id))
136 return true;
137
138 return false;
139}
140
141struct bch_inode_unpacked;
142
143#ifndef NO_BCACHEFS_FS
144
145struct bch_inode_info *
146__bch2_create(struct mnt_idmap *, struct bch_inode_info *,
147 struct dentry *, umode_t, dev_t, subvol_inum, unsigned);
148
149int bch2_inode_or_descendents_is_open(struct btree_trans *trans, struct bpos p);
150
151int bch2_fs_quota_transfer(struct bch_fs *,
152 struct bch_inode_info *,
153 struct bch_qid,
154 unsigned,
155 enum quota_acct_mode);
156
157static inline int bch2_set_projid(struct bch_fs *c,
158 struct bch_inode_info *inode,
159 u32 projid)
160{
161 struct bch_qid qid = inode->ei_qid;
162
163 qid.q[QTYP_PRJ] = projid;
164
165 return bch2_fs_quota_transfer(c, inode, qid,
166 1 << QTYP_PRJ,
167 KEY_TYPE_QUOTA_PREALLOC);
168}
169
170struct inode *bch2_vfs_inode_get(struct bch_fs *, subvol_inum);
171
172/* returns 0 if we want to do the update, or error is passed up */
173typedef int (*inode_set_fn)(struct btree_trans *,
174 struct bch_inode_info *,
175 struct bch_inode_unpacked *, void *);
176
177void bch2_inode_update_after_write(struct btree_trans *,
178 struct bch_inode_info *,
179 struct bch_inode_unpacked *,
180 unsigned);
181int __must_check bch2_write_inode(struct bch_fs *, struct bch_inode_info *,
182 inode_set_fn, void *, unsigned);
183
184int bch2_setattr_nonsize(struct mnt_idmap *,
185 struct bch_inode_info *,
186 struct iattr *);
187int __bch2_unlink(struct inode *, struct dentry *, bool);
188
189void bch2_evict_subvolume_inodes(struct bch_fs *, snapshot_id_list *);
190
191void bch2_fs_vfs_exit(struct bch_fs *);
192int bch2_fs_vfs_init(struct bch_fs *);
193
194void bch2_vfs_exit(void);
195int bch2_vfs_init(void);
196
197#else
198
199#define bch2_inode_update_after_write(_trans, _inode, _inode_u, _fields) ({ do {} while (0); })
200
201static inline int bch2_inode_or_descendents_is_open(struct btree_trans *trans, struct bpos p) { return 0; }
202
203static inline void bch2_evict_subvolume_inodes(struct bch_fs *c,
204 snapshot_id_list *s) {}
205
206static inline void bch2_fs_vfs_exit(struct bch_fs *c) {}
207static inline int bch2_fs_vfs_init(struct bch_fs *c) { return 0; }
208
209static inline void bch2_vfs_exit(void) {}
210static inline int bch2_vfs_init(void) { return 0; }
211
212#endif /* NO_BCACHEFS_FS */
213
214#endif /* _BCACHEFS_FS_H */