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_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         u32                     ei_subvol;
  48
  49         /* copy of inode in btree: */
  50         struct bch_inode_unpacked ei_inode;
  51 };
  52
  53 static inline subvol_inum inode_inum(struct bch_inode_info *inode)
  54 {
  55         return (subvol_inum) {
  56                 .subvol = inode->ei_subvol,
  57                 .inum   = inode->ei_inode.bi_inum,
  58         };
  59 }
  60
  61 /*
  62  * Set if we've gotten a btree error for this inode, and thus the vfs inode and
  63  * btree inode may be inconsistent:
  64  */
  65 #define EI_INODE_ERROR                  0
  66
  67 #define to_bch_ei(_inode)                                       \
  68         container_of_or_null(_inode, struct bch_inode_info, v)
  69
  70 static inline int ptrcmp(void *l, void *r)
  71 {
  72         return cmp_int(l, r);
  73 }
  74
  75 enum bch_inode_lock_op {
  76         INODE_LOCK              = (1U << 0),
  77         INODE_PAGECACHE_BLOCK   = (1U << 1),
  78         INODE_UPDATE_LOCK       = (1U << 2),
  79 };
  80
  81 #define bch2_lock_inodes(_locks, ...)                                   \
  82 do {                                                                    \
  83         struct bch_inode_info *a[] = { NULL, __VA_ARGS__ };             \
  84         unsigned i;                                                     \
  85                                                                         \
  86         bubble_sort(&a[1], ARRAY_SIZE(a) - 1, ptrcmp);                  \
  87                                                                         \
  88         for (i = 1; i < ARRAY_SIZE(a); i++)                             \
  89                 if (a[i] != a[i - 1]) {                                 \
  90                         if ((_locks) & INODE_LOCK)                      \
  91                                 down_write_nested(&a[i]->v.i_rwsem, i); \
  92                         if ((_locks) & INODE_PAGECACHE_BLOCK)           \
  93                                 bch2_pagecache_block_get(&a[i]->ei_pagecache_lock);\
  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, ...)                                 \
 100 do {                                                                    \
 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_LOCK)                      \
 109                                 up_write(&a[i]->v.i_rwsem);             \
 110                         if ((_locks) & INODE_PAGECACHE_BLOCK)           \
 111                                 bch2_pagecache_block_put(&a[i]->ei_pagecache_lock);\
 112                         if ((_locks) & INODE_UPDATE_LOCK)                       \
 113                                 mutex_unlock(&a[i]->ei_update_lock);    \
 114                 }                                                       \
 115 } while (0)
 116
 117 static inline struct bch_inode_info *file_bch_inode(struct file *file)
 118 {
 119         return to_bch_ei(file_inode(file));
 120 }
 121
 122 static inline bool inode_attr_changing(struct bch_inode_info *dir,
 123                                 struct bch_inode_info *inode,
 124                                 enum inode_opt_id id)
 125 {
 126         return !(inode->ei_inode.bi_fields_set & (1 << id)) &&
 127                 bch2_inode_opt_get(&dir->ei_inode, id) !=
 128                 bch2_inode_opt_get(&inode->ei_inode, id);
 129 }
 130
 131 static inline bool inode_attrs_changing(struct bch_inode_info *dir,
 132                                  struct bch_inode_info *inode)
 133 {
 134         unsigned id;
 135
 136         for (id = 0; id < Inode_opt_nr; id++)
 137                 if (inode_attr_changing(dir, inode, id))
 138                         return true;
 139
 140         return false;
 141 }
 142
 143 struct bch_inode_unpacked;
 144
 145 #ifndef NO_BCACHEFS_FS
 146
 147 struct bch_inode_info *
 148 __bch2_create(struct user_namespace *, struct bch_inode_info *,
 149               struct dentry *, umode_t, dev_t, subvol_inum, unsigned);
 150
 151 int bch2_fs_quota_transfer(struct bch_fs *,
 152                            struct bch_inode_info *,
 153                            struct bch_qid,
 154                            unsigned,
 155                            enum quota_acct_mode);
 156
 157 static 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
 170 struct 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 */
 173 typedef int (*inode_set_fn)(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 user_namespace *,
 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 *, struct snapshot_id_list *);
 189
 190 void bch2_vfs_exit(void);
 191 int bch2_vfs_init(void);
 192
 193 #else
 194
 195 static inline void bch2_evict_subvolume_inodes(struct bch_fs *c,
 196                                                struct snapshot_id_list *s) {}
 197 static inline void bch2_vfs_exit(void) {}
 198 static inline int bch2_vfs_init(void) { return 0; }
 199
 200 #endif /* NO_BCACHEFS_FS */
 201
 202 #endif /* _BCACHEFS_FS_H */