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         unsigned long           ei_flags;
  37
  38         struct mutex            ei_update_lock;
  39         u64                     ei_journal_seq;
  40         u64                     ei_quota_reserved;
  41         unsigned long           ei_last_dirtied;
  42
  43         struct pagecache_lock   ei_pagecache_lock;
  44
  45         struct mutex            ei_quota_lock;
  46         struct bch_qid          ei_qid;
  47
  48         /* copy of inode in btree: */
  49         struct bch_inode_unpacked ei_inode;
  50 };
  51
  52 /*
  53  * Set if we've gotten a btree error for this inode, and thus the vfs inode and
  54  * btree inode may be inconsistent:
  55  */
  56 #define EI_INODE_ERROR                  0
  57
  58 #define to_bch_ei(_inode)                                       \
  59         container_of_or_null(_inode, struct bch_inode_info, v)
  60
  61 static inline int ptrcmp(void *l, void *r)
  62 {
  63         return cmp_int(l, r);
  64 }
  65
  66 enum bch_inode_lock_op {
  67         INODE_LOCK              = (1U << 0),
  68         INODE_PAGECACHE_BLOCK   = (1U << 1),
  69         INODE_UPDATE_LOCK       = (1U << 2),
  70 };
  71
  72 #define bch2_lock_inodes(_locks, ...)                                   \
  73 do {                                                                    \
  74         struct bch_inode_info *a[] = { NULL, __VA_ARGS__ };             \
  75         unsigned i;                                                     \
  76                                                                         \
  77         bubble_sort(&a[1], ARRAY_SIZE(a) - 1, ptrcmp);                  \
  78                                                                         \
  79         for (i = 1; i < ARRAY_SIZE(a); i++)                             \
  80                 if (a[i] != a[i - 1]) {                                 \
  81                         if ((_locks) & INODE_LOCK)                      \
  82                                 down_write_nested(&a[i]->v.i_rwsem, i); \
  83                         if ((_locks) & INODE_PAGECACHE_BLOCK)           \
  84                                 bch2_pagecache_block_get(&a[i]->ei_pagecache_lock);\
  85                         if ((_locks) & INODE_UPDATE_LOCK)                       \
  86                                 mutex_lock_nested(&a[i]->ei_update_lock, i);\
  87                 }                                                       \
  88 } while (0)
  89
  90 #define bch2_unlock_inodes(_locks, ...)                                 \
  91 do {                                                                    \
  92         struct bch_inode_info *a[] = { NULL, __VA_ARGS__ };             \
  93         unsigned i;                                                     \
  94                                                                         \
  95         bubble_sort(&a[1], ARRAY_SIZE(a) - 1, ptrcmp);                  \
  96                                                                         \
  97         for (i = 1; i < ARRAY_SIZE(a); i++)                             \
  98                 if (a[i] != a[i - 1]) {                                 \
  99                         if ((_locks) & INODE_LOCK)                      \
 100                                 up_write(&a[i]->v.i_rwsem);             \
 101                         if ((_locks) & INODE_PAGECACHE_BLOCK)           \
 102                                 bch2_pagecache_block_put(&a[i]->ei_pagecache_lock);\
 103                         if ((_locks) & INODE_UPDATE_LOCK)                       \
 104                                 mutex_unlock(&a[i]->ei_update_lock);    \
 105                 }                                                       \
 106 } while (0)
 107
 108 static inline struct bch_inode_info *file_bch_inode(struct file *file)
 109 {
 110         return to_bch_ei(file_inode(file));
 111 }
 112
 113 static inline bool inode_attr_changing(struct bch_inode_info *dir,
 114                                 struct bch_inode_info *inode,
 115                                 enum inode_opt_id id)
 116 {
 117         return !(inode->ei_inode.bi_fields_set & (1 << id)) &&
 118                 bch2_inode_opt_get(&dir->ei_inode, id) !=
 119                 bch2_inode_opt_get(&inode->ei_inode, id);
 120 }
 121
 122 static inline bool inode_attrs_changing(struct bch_inode_info *dir,
 123                                  struct bch_inode_info *inode)
 124 {
 125         unsigned id;
 126
 127         for (id = 0; id < Inode_opt_nr; id++)
 128                 if (inode_attr_changing(dir, inode, id))
 129                         return true;
 130
 131         return false;
 132 }
 133
 134 struct bch_inode_unpacked;
 135
 136 #ifndef NO_BCACHEFS_FS
 137
 138 int bch2_fs_quota_transfer(struct bch_fs *,
 139                            struct bch_inode_info *,
 140                            struct bch_qid,
 141                            unsigned,
 142                            enum quota_acct_mode);
 143
 144 static inline int bch2_set_projid(struct bch_fs *c,
 145                                   struct bch_inode_info *inode,
 146                                   u32 projid)
 147 {
 148         struct bch_qid qid = inode->ei_qid;
 149
 150         qid.q[QTYP_PRJ] = projid;
 151
 152         return bch2_fs_quota_transfer(c, inode, qid,
 153                                       1 << QTYP_PRJ,
 154                                       KEY_TYPE_QUOTA_PREALLOC);
 155 }
 156
 157 struct inode *bch2_vfs_inode_get(struct bch_fs *, u64);
 158
 159 /* returns 0 if we want to do the update, or error is passed up */
 160 typedef int (*inode_set_fn)(struct bch_inode_info *,
 161                             struct bch_inode_unpacked *, void *);
 162
 163 void bch2_inode_update_after_write(struct bch_fs *,
 164                                    struct bch_inode_info *,
 165                                    struct bch_inode_unpacked *,
 166                                    unsigned);
 167 int __must_check bch2_write_inode(struct bch_fs *, struct bch_inode_info *,
 168                                   inode_set_fn, void *, unsigned);
 169
 170 int bch2_setattr_nonsize(struct user_namespace *,
 171                          struct bch_inode_info *,
 172                          struct iattr *);
 173
 174 void bch2_vfs_exit(void);
 175 int bch2_vfs_init(void);
 176
 177 #else
 178
 179 static inline void bch2_vfs_exit(void) {}
 180 static inline int bch2_vfs_init(void) { return 0; }
 181
 182 #endif /* NO_BCACHEFS_FS */
 183
 184 #endif /* _BCACHEFS_FS_H */