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         u32                     ei_subvol;
  49
  50         /* copy of inode in btree: */
  51         struct bch_inode_unpacked ei_inode;
  52 };
  53
  54 static inline subvol_inum inode_inum(struct bch_inode_info *inode)
  55 {
  56         return (subvol_inum) {
  57                 .subvol = inode->ei_subvol,
  58                 .inum   = inode->ei_inode.bi_inum,
  59         };
  60 }
  61
  62 /*
  63  * Set if we've gotten a btree error for this inode, and thus the vfs inode and
  64  * btree inode may be inconsistent:
  65  */
  66 #define EI_INODE_ERROR                  0
  67
  68 #define to_bch_ei(_inode)                                       \
  69         container_of_or_null(_inode, struct bch_inode_info, v)
  70
  71 static inline int ptrcmp(void *l, void *r)
  72 {
  73         return cmp_int(l, r);
  74 }
  75
  76 enum bch_inode_lock_op {
  77         INODE_LOCK              = (1U << 0),
  78         INODE_PAGECACHE_BLOCK   = (1U << 1),
  79         INODE_UPDATE_LOCK       = (1U << 2),
  80 };
  81
  82 #define bch2_lock_inodes(_locks, ...)                                   \
  83 do {                                                                    \
  84         struct bch_inode_info *a[] = { NULL, __VA_ARGS__ };             \
  85         unsigned i;                                                     \
  86                                                                         \
  87         bubble_sort(&a[1], ARRAY_SIZE(a) - 1, ptrcmp);                  \
  88                                                                         \
  89         for (i = 1; i < ARRAY_SIZE(a); i++)                             \
  90                 if (a[i] != a[i - 1]) {                                 \
  91                         if ((_locks) & INODE_LOCK)                      \
  92                                 down_write_nested(&a[i]->v.i_rwsem, i); \
  93                         if ((_locks) & INODE_PAGECACHE_BLOCK)           \
  94                                 bch2_pagecache_block_get(&a[i]->ei_pagecache_lock);\
  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_LOCK)                      \
 110                                 up_write(&a[i]->v.i_rwsem);             \
 111                         if ((_locks) & INODE_PAGECACHE_BLOCK)           \
 112                                 bch2_pagecache_block_put(&a[i]->ei_pagecache_lock);\
 113                         if ((_locks) & INODE_UPDATE_LOCK)                       \
 114                                 mutex_unlock(&a[i]->ei_update_lock);    \
 115                 }                                                       \
 116 } while (0)
 117
 118 static inline struct bch_inode_info *file_bch_inode(struct file *file)
 119 {
 120         return to_bch_ei(file_inode(file));
 121 }
 122
 123 static inline bool inode_attr_changing(struct bch_inode_info *dir,
 124                                 struct bch_inode_info *inode,
 125                                 enum inode_opt_id id)
 126 {
 127         return !(inode->ei_inode.bi_fields_set & (1 << id)) &&
 128                 bch2_inode_opt_get(&dir->ei_inode, id) !=
 129                 bch2_inode_opt_get(&inode->ei_inode, id);
 130 }
 131
 132 static inline bool inode_attrs_changing(struct bch_inode_info *dir,
 133                                  struct bch_inode_info *inode)
 134 {
 135         unsigned id;
 136
 137         for (id = 0; id < Inode_opt_nr; id++)
 138                 if (inode_attr_changing(dir, inode, id))
 139                         return true;
 140
 141         return false;
 142 }
 143
 144 struct bch_inode_unpacked;
 145
 146 #ifndef NO_BCACHEFS_FS
 147
 148 struct bch_inode_info *
 149 __bch2_create(struct user_namespace *, struct bch_inode_info *,
 150               struct dentry *, umode_t, dev_t, subvol_inum, unsigned);
 151
 152 int bch2_fs_quota_transfer(struct bch_fs *,
 153                            struct bch_inode_info *,
 154                            struct bch_qid,
 155                            unsigned,
 156                            enum quota_acct_mode);
 157
 158 static inline int bch2_set_projid(struct bch_fs *c,
 159                                   struct bch_inode_info *inode,
 160                                   u32 projid)
 161 {
 162         struct bch_qid qid = inode->ei_qid;
 163
 164         qid.q[QTYP_PRJ] = projid;
 165
 166         return bch2_fs_quota_transfer(c, inode, qid,
 167                                       1 << QTYP_PRJ,
 168                                       KEY_TYPE_QUOTA_PREALLOC);
 169 }
 170
 171 struct inode *bch2_vfs_inode_get(struct bch_fs *, subvol_inum);
 172
 173 /* returns 0 if we want to do the update, or error is passed up */
 174 typedef int (*inode_set_fn)(struct bch_inode_info *,
 175                             struct bch_inode_unpacked *, void *);
 176
 177 void bch2_inode_update_after_write(struct bch_fs *,
 178                                    struct bch_inode_info *,
 179                                    struct bch_inode_unpacked *,
 180                                    unsigned);
 181 int __must_check bch2_write_inode(struct bch_fs *, struct bch_inode_info *,
 182                                   inode_set_fn, void *, unsigned);
 183
 184 int bch2_setattr_nonsize(struct user_namespace *,
 185                          struct bch_inode_info *,
 186                          struct iattr *);
 187 int __bch2_unlink(struct inode *, struct dentry *, bool);
 188
 189 void bch2_evict_subvolume_inodes(struct bch_fs *, struct snapshot_id_list *);
 190
 191 void bch2_vfs_exit(void);
 192 int bch2_vfs_init(void);
 193
 194 #else
 195
 196 static inline void bch2_evict_subvolume_inodes(struct bch_fs *c,
 197                                                struct snapshot_id_list *s) {}
 198 static inline void bch2_vfs_exit(void) {}
 199 static inline int bch2_vfs_init(void) { return 0; }
 200
 201 #endif /* NO_BCACHEFS_FS */
 202
 203 #endif /* _BCACHEFS_FS_H */