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         subvol_inum             ei_inum;
  18
  19         struct list_head        ei_vfs_inode_list;
  20         unsigned long           ei_flags;
  21
  22         struct mutex            ei_update_lock;
  23         u64                     ei_quota_reserved;
  24         unsigned long           ei_last_dirtied;
  25         two_state_lock_t        ei_pagecache_lock;
  26
  27         struct mutex            ei_quota_lock;
  28         struct bch_qid          ei_qid;
  29
  30         /*
  31          * When we've been doing nocow writes we'll need to issue flushes to the
  32          * underlying block devices
  33          *
  34          * XXX: a device may have had a flush issued by some other codepath. It
  35          * would be better to keep for each device a sequence number that's
  36          * incremented when we isusue a cache flush, and track here the sequence
  37          * number that needs flushing.
  38          */
  39         struct bch_devs_mask    ei_devs_need_flush;
  40
  41         /* copy of inode in btree: */
  42         struct bch_inode_unpacked ei_inode;
  43 };
  44
  45 #define bch2_pagecache_add_put(i)       bch2_two_state_unlock(&i->ei_pagecache_lock, 0)
  46 #define bch2_pagecache_add_tryget(i)    bch2_two_state_trylock(&i->ei_pagecache_lock, 0)
  47 #define bch2_pagecache_add_get(i)       bch2_two_state_lock(&i->ei_pagecache_lock, 0)
  48
  49 #define bch2_pagecache_block_put(i)     bch2_two_state_unlock(&i->ei_pagecache_lock, 1)
  50 #define bch2_pagecache_block_get(i)     bch2_two_state_lock(&i->ei_pagecache_lock, 1)
  51
  52 static inline subvol_inum inode_inum(struct bch_inode_info *inode)
  53 {
  54         return inode->ei_inum;
  55 }
  56
  57 /*
  58  * Set if we've gotten a btree error for this inode, and thus the vfs inode and
  59  * btree inode may be inconsistent:
  60  */
  61 #define EI_INODE_ERROR                  0
  62
  63 /*
  64  * Set in the inode is in a snapshot subvolume - we don't do quota accounting in
  65  * those:
  66  */
  67 #define EI_INODE_SNAPSHOT               1
  68 #define EI_INODE_HASHED                 2
  69
  70 #define to_bch_ei(_inode)                                       \
  71         container_of_or_null(_inode, struct bch_inode_info, v)
  72
  73 static inline int ptrcmp(void *l, void *r)
  74 {
  75         return cmp_int(l, r);
  76 }
  77
  78 enum bch_inode_lock_op {
  79         INODE_PAGECACHE_BLOCK   = (1U << 0),
  80         INODE_UPDATE_LOCK       = (1U << 1),
  81 };
  82
  83 #define bch2_lock_inodes(_locks, ...)                                   \
  84 do {                                                                    \
  85         struct bch_inode_info *a[] = { NULL, __VA_ARGS__ };             \
  86         unsigned i;                                                     \
  87                                                                         \
  88         bubble_sort(&a[1], ARRAY_SIZE(a) - 1, ptrcmp);                  \
  89                                                                         \
  90         for (i = 1; i < ARRAY_SIZE(a); i++)                             \
  91                 if (a[i] != a[i - 1]) {                                 \
  92                         if ((_locks) & INODE_PAGECACHE_BLOCK)           \
  93                                 bch2_pagecache_block_get(a[i]);\
  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_PAGECACHE_BLOCK)           \
 109                                 bch2_pagecache_block_put(a[i]);\
 110                         if ((_locks) & INODE_UPDATE_LOCK)                       \
 111                                 mutex_unlock(&a[i]->ei_update_lock);    \
 112                 }                                                       \
 113 } while (0)
 114
 115 static inline struct bch_inode_info *file_bch_inode(struct file *file)
 116 {
 117         return to_bch_ei(file_inode(file));
 118 }
 119
 120 static inline bool inode_attr_changing(struct bch_inode_info *dir,
 121                                 struct bch_inode_info *inode,
 122                                 enum inode_opt_id id)
 123 {
 124         return !(inode->ei_inode.bi_fields_set & (1 << id)) &&
 125                 bch2_inode_opt_get(&dir->ei_inode, id) !=
 126                 bch2_inode_opt_get(&inode->ei_inode, id);
 127 }
 128
 129 static inline bool inode_attrs_changing(struct bch_inode_info *dir,
 130                                  struct bch_inode_info *inode)
 131 {
 132         unsigned id;
 133
 134         for (id = 0; id < Inode_opt_nr; id++)
 135                 if (inode_attr_changing(dir, inode, id))
 136                         return true;
 137
 138         return false;
 139 }
 140
 141 struct bch_inode_unpacked;
 142
 143 #ifndef NO_BCACHEFS_FS
 144
 145 struct bch_inode_info *
 146 __bch2_create(struct mnt_idmap *, struct bch_inode_info *,
 147               struct dentry *, umode_t, dev_t, subvol_inum, unsigned);
 148
 149 int bch2_inode_or_descendents_is_open(struct btree_trans *trans, struct bpos p);
 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 btree_trans *,
 174                             struct bch_inode_info *,
 175                             struct bch_inode_unpacked *, void *);
 176
 177 void bch2_inode_update_after_write(struct btree_trans *,
 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 mnt_idmap *,
 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 *, snapshot_id_list *);
 190
 191 void bch2_fs_vfs_exit(struct bch_fs *);
 192 int bch2_fs_vfs_init(struct bch_fs *);
 193
 194 void bch2_vfs_exit(void);
 195 int bch2_vfs_init(void);
 196
 197 #else
 198
 199 #define bch2_inode_update_after_write(_trans, _inode, _inode_u, _fields)        ({ do {} while (0); })
 200
 201 static inline int bch2_inode_or_descendents_is_open(struct btree_trans *trans, struct bpos p) { return 0; }
 202
 203 static inline void bch2_evict_subvolume_inodes(struct bch_fs *c,
 204                                                snapshot_id_list *s) {}
 205
 206 static inline void bch2_fs_vfs_exit(struct bch_fs *c) {}
 207 static inline int bch2_fs_vfs_init(struct bch_fs *c) { return 0; }
 208
 209 static inline void bch2_vfs_exit(void) {}
 210 static inline int bch2_vfs_init(void) { return 0; }
 211
 212 #endif /* NO_BCACHEFS_FS */
 213
 214 #endif /* _BCACHEFS_FS_H */