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 void bch2_pagecache_add_get(struct pagecache_lock *);
  30 void bch2_pagecache_block_put(struct pagecache_lock *);
  31 void bch2_pagecache_block_get(struct pagecache_lock *);
  32
  33 struct bch_inode_info {
  34         struct inode            v;
  35
  36         struct mutex            ei_update_lock;
  37         u64                     ei_journal_seq;
  38         u64                     ei_quota_reserved;
  39         unsigned long           ei_last_dirtied;
  40
  41         struct pagecache_lock   ei_pagecache_lock;
  42
  43         struct mutex            ei_quota_lock;
  44         struct bch_qid          ei_qid;
  45
  46         struct bch_hash_info    ei_str_hash;
  47
  48         /* copy of inode in btree: */
  49         struct bch_inode_unpacked ei_inode;
  50 };
  51
  52 #define to_bch_ei(_inode)                                       \
  53         container_of_or_null(_inode, struct bch_inode_info, v)
  54
  55 static inline int ptrcmp(void *l, void *r)
  56 {
  57         return cmp_int(l, r);
  58 }
  59
  60 enum bch_inode_lock_op {
  61         INODE_LOCK              = (1U << 0),
  62         INODE_PAGECACHE_BLOCK   = (1U << 1),
  63         INODE_UPDATE_LOCK       = (1U << 2),
  64 };
  65
  66 #define bch2_lock_inodes(_locks, ...)                                   \
  67 do {                                                                    \
  68         struct bch_inode_info *a[] = { NULL, __VA_ARGS__ };             \
  69         unsigned i;                                                     \
  70                                                                         \
  71         bubble_sort(&a[1], ARRAY_SIZE(a) - 1, ptrcmp);                  \
  72                                                                         \
  73         for (i = 1; i < ARRAY_SIZE(a); i++)                             \
  74                 if (a[i] != a[i - 1]) {                                 \
  75                         if ((_locks) & INODE_LOCK)                      \
  76                                 down_write_nested(&a[i]->v.i_rwsem, i); \
  77                         if ((_locks) & INODE_PAGECACHE_BLOCK)           \
  78                                 bch2_pagecache_block_get(&a[i]->ei_pagecache_lock);\
  79                         if ((_locks) & INODE_UPDATE_LOCK)                       \
  80                                 mutex_lock_nested(&a[i]->ei_update_lock, i);\
  81                 }                                                       \
  82 } while (0)
  83
  84 #define bch2_unlock_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_LOCK)                      \
  94                                 up_write(&a[i]->v.i_rwsem);             \
  95                         if ((_locks) & INODE_PAGECACHE_BLOCK)           \
  96                                 bch2_pagecache_block_put(&a[i]->ei_pagecache_lock);\
  97                         if ((_locks) & INODE_UPDATE_LOCK)                       \
  98                                 mutex_unlock(&a[i]->ei_update_lock);    \
  99                 }                                                       \
 100 } while (0)
 101
 102 static inline struct bch_inode_info *file_bch_inode(struct file *file)
 103 {
 104         return to_bch_ei(file_inode(file));
 105 }
 106
 107 static inline bool inode_attr_changing(struct bch_inode_info *dir,
 108                                 struct bch_inode_info *inode,
 109                                 enum inode_opt_id id)
 110 {
 111         return !(inode->ei_inode.bi_fields_set & (1 << id)) &&
 112                 bch2_inode_opt_get(&dir->ei_inode, id) !=
 113                 bch2_inode_opt_get(&inode->ei_inode, id);
 114 }
 115
 116 static inline bool inode_attrs_changing(struct bch_inode_info *dir,
 117                                  struct bch_inode_info *inode)
 118 {
 119         unsigned id;
 120
 121         for (id = 0; id < Inode_opt_nr; id++)
 122                 if (inode_attr_changing(dir, inode, id))
 123                         return true;
 124
 125         return false;
 126 }
 127
 128 struct bch_inode_unpacked;
 129
 130 #ifndef NO_BCACHEFS_FS
 131
 132 int bch2_fs_quota_transfer(struct bch_fs *,
 133                            struct bch_inode_info *,
 134                            struct bch_qid,
 135                            unsigned,
 136                            enum quota_acct_mode);
 137
 138 static inline int bch2_set_projid(struct bch_fs *c,
 139                                   struct bch_inode_info *inode,
 140                                   u32 projid)
 141 {
 142         struct bch_qid qid = inode->ei_qid;
 143
 144         qid.q[QTYP_PRJ] = projid;
 145
 146         return bch2_fs_quota_transfer(c, inode, qid,
 147                                       1 << QTYP_PRJ,
 148                                       KEY_TYPE_QUOTA_PREALLOC);
 149 }
 150
 151 struct inode *bch2_vfs_inode_get(struct bch_fs *, u64);
 152
 153 /* returns 0 if we want to do the update, or error is passed up */
 154 typedef int (*inode_set_fn)(struct bch_inode_info *,
 155                             struct bch_inode_unpacked *, void *);
 156
 157 void bch2_inode_update_after_write(struct bch_fs *,
 158                                    struct bch_inode_info *,
 159                                    struct bch_inode_unpacked *,
 160                                    unsigned);
 161 int __must_check bch2_write_inode(struct bch_fs *, struct bch_inode_info *,
 162                                   inode_set_fn, void *, unsigned);
 163
 164 void bch2_vfs_exit(void);
 165 int bch2_vfs_init(void);
 166
 167 #else
 168
 169 static inline void bch2_vfs_exit(void) {}
 170 static inline int bch2_vfs_init(void) { return 0; }
 171
 172 #endif /* NO_BCACHEFS_FS */
 173
 174 #endif /* _BCACHEFS_FS_H */