fs/bcachefs/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 #include "two_state_shared_lock.h"
  10
  11 #include <linux/seqlock.h>
  12 #include <linux/stat.h>
  13
  14 struct bch_inode_info {
  15         struct inode            v;
  16         struct rhash_head       hash;
  17         struct rhlist_head      by_inum_hash;
  18         subvol_inum             ei_inum;
  19
  20         struct list_head        ei_vfs_inode_list;
  21         unsigned long           ei_flags;
  22
  23         struct mutex            ei_update_lock;
  24         u64                     ei_quota_reserved;
  25         unsigned long           ei_last_dirtied;
  26         two_state_lock_t        ei_pagecache_lock;
  27
  28         struct mutex            ei_quota_lock;
  29         struct bch_qid          ei_qid;
  30
  31         /*
  32          * When we've been doing nocow writes we'll need to issue flushes to the
  33          * underlying block devices
  34          *
  35          * XXX: a device may have had a flush issued by some other codepath. It
  36          * would be better to keep for each device a sequence number that's
  37          * incremented when we isusue a cache flush, and track here the sequence
  38          * number that needs flushing.
  39          */
  40         struct bch_devs_mask    ei_devs_need_flush;
  41
  42         /* copy of inode in btree: */
  43         struct bch_inode_unpacked ei_inode;
  44 };
  45
  46 #define bch2_pagecache_add_put(i)       bch2_two_state_unlock(&i->ei_pagecache_lock, 0)
  47 #define bch2_pagecache_add_tryget(i)    bch2_two_state_trylock(&i->ei_pagecache_lock, 0)
  48 #define bch2_pagecache_add_get(i)       bch2_two_state_lock(&i->ei_pagecache_lock, 0)
  49
  50 #define bch2_pagecache_block_put(i)     bch2_two_state_unlock(&i->ei_pagecache_lock, 1)
  51 #define bch2_pagecache_block_get(i)     bch2_two_state_lock(&i->ei_pagecache_lock, 1)
  52
  53 static inline subvol_inum inode_inum(struct bch_inode_info *inode)
  54 {
  55         return inode->ei_inum;
  56 }
  57
  58 /*
  59  * Set if we've gotten a btree error for this inode, and thus the vfs inode and
  60  * btree inode may be inconsistent:
  61  */
  62 #define EI_INODE_ERROR                  0
  63
  64 /*
  65  * Set in the inode is in a snapshot subvolume - we don't do quota accounting in
  66  * those:
  67  */
  68 #define EI_INODE_SNAPSHOT               1
  69 #define EI_INODE_HASHED                 2
  70
  71 #define to_bch_ei(_inode)                                       \
  72         container_of_or_null(_inode, struct bch_inode_info, v)
  73
  74 static inline int ptrcmp(void *l, void *r)
  75 {
  76         return cmp_int(l, r);
  77 }
  78
  79 enum bch_inode_lock_op {
  80         INODE_PAGECACHE_BLOCK   = (1U << 0),
  81         INODE_UPDATE_LOCK       = (1U << 1),
  82 };
  83
  84 #define bch2_lock_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_PAGECACHE_BLOCK)           \
  94                                 bch2_pagecache_block_get(a[i]);\
  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_PAGECACHE_BLOCK)           \
 110                                 bch2_pagecache_block_put(a[i]);\
 111                         if ((_locks) & INODE_UPDATE_LOCK)                       \
 112                                 mutex_unlock(&a[i]->ei_update_lock);    \
 113                 }                                                       \
 114 } while (0)
 115
 116 static inline struct bch_inode_info *file_bch_inode(struct file *file)
 117 {
 118         return to_bch_ei(file_inode(file));
 119 }
 120
 121 static inline bool inode_attr_changing(struct bch_inode_info *dir,
 122                                 struct bch_inode_info *inode,
 123                                 enum inode_opt_id id)
 124 {
 125         return !(inode->ei_inode.bi_fields_set & (1 << id)) &&
 126                 bch2_inode_opt_get(&dir->ei_inode, id) !=
 127                 bch2_inode_opt_get(&inode->ei_inode, id);
 128 }
 129
 130 static inline bool inode_attrs_changing(struct bch_inode_info *dir,
 131                                  struct bch_inode_info *inode)
 132 {
 133         unsigned id;
 134
 135         for (id = 0; id < Inode_opt_nr; id++)
 136                 if (inode_attr_changing(dir, inode, id))
 137                         return true;
 138
 139         return false;
 140 }
 141
 142 struct bch_inode_unpacked;
 143
 144 #ifndef NO_BCACHEFS_FS
 145
 146 struct bch_inode_info *
 147 __bch2_create(struct mnt_idmap *, struct bch_inode_info *,
 148               struct dentry *, umode_t, dev_t, subvol_inum, unsigned);
 149
 150 int bch2_inode_or_descendents_is_open(struct btree_trans *trans, struct bpos p);
 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 btree_trans *,
 175                             struct bch_inode_info *,
 176                             struct bch_inode_unpacked *, void *);
 177
 178 void bch2_inode_update_after_write(struct btree_trans *,
 179                                    struct bch_inode_info *,
 180                                    struct bch_inode_unpacked *,
 181                                    unsigned);
 182 int __must_check bch2_write_inode(struct bch_fs *, struct bch_inode_info *,
 183                                   inode_set_fn, void *, unsigned);
 184
 185 int bch2_setattr_nonsize(struct mnt_idmap *,
 186                          struct bch_inode_info *,
 187                          struct iattr *);
 188 int __bch2_unlink(struct inode *, struct dentry *, bool);
 189
 190 void bch2_evict_subvolume_inodes(struct bch_fs *, snapshot_id_list *);
 191
 192 void bch2_fs_vfs_exit(struct bch_fs *);
 193 int bch2_fs_vfs_init(struct bch_fs *);
 194
 195 void bch2_vfs_exit(void);
 196 int bch2_vfs_init(void);
 197
 198 #else
 199
 200 #define bch2_inode_update_after_write(_trans, _inode, _inode_u, _fields)        ({ do {} while (0); })
 201
 202 static inline int bch2_inode_or_descendents_is_open(struct btree_trans *trans, struct bpos p) { return 0; }
 203
 204 static inline void bch2_evict_subvolume_inodes(struct bch_fs *c,
 205                                                snapshot_id_list *s) {}
 206
 207 static inline void bch2_fs_vfs_exit(struct bch_fs *c) {}
 208 static inline int bch2_fs_vfs_init(struct bch_fs *c) { return 0; }
 209
 210 static inline void bch2_vfs_exit(void) {}
 211 static inline int bch2_vfs_init(void) { return 0; }
 212
 213 #endif /* NO_BCACHEFS_FS */
 214
 215 #endif /* _BCACHEFS_FS_H */