git.sesse.net Git - bcachefs-tools-debian/blob - libbcachefs/fs.h

   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
  10 #include <linux/seqlock.h>
  11 #include <linux/stat.h>
  12
  13 /*
  14  * Two-state lock - can be taken for add or block - both states are shared,
  15  * like read side of rwsem, but conflict with other state:
  16  */
  17 struct pagecache_lock {
  18         atomic_long_t           v;
  19         wait_queue_head_t       wait;
  20 };
  21
  22 static inline void pagecache_lock_init(struct pagecache_lock *lock)
  23 {
  24         atomic_long_set(&lock->v, 0);
  25         init_waitqueue_head(&lock->wait);
  26 }
  27
  28 void bch2_pagecache_add_put(struct pagecache_lock *);
  29 bool bch2_pagecache_add_tryget(struct pagecache_lock *);
  30 void bch2_pagecache_add_get(struct pagecache_lock *);
  31 void bch2_pagecache_block_put(struct pagecache_lock *);
  32 void bch2_pagecache_block_get(struct pagecache_lock *);
  33
  34 struct bch_inode_info {
  35         struct inode            v;
  36
  37         struct mutex            ei_update_lock;
  38         u64                     ei_journal_seq;
  39         u64                     ei_quota_reserved;
  40         unsigned long           ei_last_dirtied;
  41
  42         struct pagecache_lock   ei_pagecache_lock;
  43
  44         struct mutex            ei_quota_lock;
  45         struct bch_qid          ei_qid;
  46
  47         struct bch_hash_info    ei_str_hash;
  48
  49         /* copy of inode in btree: */
  50         struct bch_inode_unpacked ei_inode;
  51 };
  52
  53 #define to_bch_ei(_inode)                                       \
  54         container_of_or_null(_inode, struct bch_inode_info, v)
  55
  56 static inline int ptrcmp(void *l, void *r)
  57 {
  58         return cmp_int(l, r);
  59 }
  60
  61 enum bch_inode_lock_op {
  62         INODE_LOCK              = (1U << 0),
  63         INODE_PAGECACHE_BLOCK   = (1U << 1),
  64         INODE_UPDATE_LOCK       = (1U << 2),
  65 };
  66
  67 #define bch2_lock_inodes(_locks, ...)                                   \
  68 do {                                                                    \
  69         struct bch_inode_info *a[] = { NULL, __VA_ARGS__ };             \
  70         unsigned i;                                                     \
  71                                                                         \
  72         bubble_sort(&a[1], ARRAY_SIZE(a) - 1, ptrcmp);                  \
  73                                                                         \
  74         for (i = 1; i < ARRAY_SIZE(a); i++)                             \
  75                 if (a[i] != a[i - 1]) {                                 \
  76                         if ((_locks) & INODE_LOCK)                      \
  77                                 down_write_nested(&a[i]->v.i_rwsem, i); \
  78                         if ((_locks) & INODE_PAGECACHE_BLOCK)           \
  79                                 bch2_pagecache_block_get(&a[i]->ei_pagecache_lock);\
  80                         if ((_locks) & INODE_UPDATE_LOCK)                       \
  81                                 mutex_lock_nested(&a[i]->ei_update_lock, i);\
  82                 }                                                       \
  83 } while (0)
  84
  85 #define bch2_unlock_inodes(_locks, ...)                                 \
  86 do {                                                                    \
  87         struct bch_inode_info *a[] = { NULL, __VA_ARGS__ };             \
  88         unsigned i;                                                     \
  89                                                                         \
  90         bubble_sort(&a[1], ARRAY_SIZE(a) - 1, ptrcmp);                  \
  91                                                                         \
  92         for (i = 1; i < ARRAY_SIZE(a); i++)                             \
  93                 if (a[i] != a[i - 1]) {                                 \
  94                         if ((_locks) & INODE_LOCK)                      \
  95                                 up_write(&a[i]->v.i_rwsem);             \
  96                         if ((_locks) & INODE_PAGECACHE_BLOCK)           \
  97                                 bch2_pagecache_block_put(&a[i]->ei_pagecache_lock);\
  98                         if ((_locks) & INODE_UPDATE_LOCK)                       \
  99                                 mutex_unlock(&a[i]->ei_update_lock);    \
 100                 }                                                       \
 101 } while (0)
 102
 103 static inline struct bch_inode_info *file_bch_inode(struct file *file)
 104 {
 105         return to_bch_ei(file_inode(file));
 106 }
 107
 108 static inline bool inode_attr_changing(struct bch_inode_info *dir,
 109                                 struct bch_inode_info *inode,
 110                                 enum inode_opt_id id)
 111 {
 112         return !(inode->ei_inode.bi_fields_set & (1 << id)) &&
 113                 bch2_inode_opt_get(&dir->ei_inode, id) !=
 114                 bch2_inode_opt_get(&inode->ei_inode, id);
 115 }
 116
 117 static inline bool inode_attrs_changing(struct bch_inode_info *dir,
 118                                  struct bch_inode_info *inode)
 119 {
 120         unsigned id;
 121
 122         for (id = 0; id < Inode_opt_nr; id++)
 123                 if (inode_attr_changing(dir, inode, id))
 124                         return true;
 125
 126         return false;
 127 }
 128
 129 struct bch_inode_unpacked;
 130
 131 #ifndef NO_BCACHEFS_FS
 132
 133 int bch2_fs_quota_transfer(struct bch_fs *,
 134                            struct bch_inode_info *,
 135                            struct bch_qid,
 136                            unsigned,
 137                            enum quota_acct_mode);
 138
 139 static inline int bch2_set_projid(struct bch_fs *c,
 140                                   struct bch_inode_info *inode,
 141                                   u32 projid)
 142 {
 143         struct bch_qid qid = inode->ei_qid;
 144
 145         qid.q[QTYP_PRJ] = projid;
 146
 147         return bch2_fs_quota_transfer(c, inode, qid,
 148                                       1 << QTYP_PRJ,
 149                                       KEY_TYPE_QUOTA_PREALLOC);
 150 }
 151
 152 struct inode *bch2_vfs_inode_get(struct bch_fs *, u64);
 153
 154 /* returns 0 if we want to do the update, or error is passed up */
 155 typedef int (*inode_set_fn)(struct bch_inode_info *,
 156                             struct bch_inode_unpacked *, void *);
 157
 158 void bch2_inode_update_after_write(struct bch_fs *,
 159                                    struct bch_inode_info *,
 160                                    struct bch_inode_unpacked *,
 161                                    unsigned);
 162 int __must_check bch2_write_inode(struct bch_fs *, struct bch_inode_info *,
 163                                   inode_set_fn, void *, unsigned);
 164
 165 void bch2_vfs_exit(void);
 166 int bch2_vfs_init(void);
 167
 168 #else
 169
 170 static inline void bch2_vfs_exit(void) {}
 171 static inline int bch2_vfs_init(void) { return 0; }
 172
 173 #endif /* NO_BCACHEFS_FS */
 174
 175 #endif /* _BCACHEFS_FS_H */