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