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 #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 list_head        ei_vfs_inode_list;
  17         unsigned long           ei_flags;
  18
  19         struct mutex            ei_update_lock;
  20         u64                     ei_quota_reserved;
  21         unsigned long           ei_last_dirtied;
  22         two_state_lock_t        ei_pagecache_lock;
  23
  24         struct mutex            ei_quota_lock;
  25         struct bch_qid          ei_qid;
  26
  27         u32                     ei_subvol;
  28
  29         /*
  30          * When we've been doing nocow writes we'll need to issue flushes to the
  31          * underlying block devices
  32          *
  33          * XXX: a device may have had a flush issued by some other codepath. It
  34          * would be better to keep for each device a sequence number that's
  35          * incremented when we isusue a cache flush, and track here the sequence
  36          * number that needs flushing.
  37          */
  38         struct bch_devs_mask    ei_devs_need_flush;
  39
  40         /* copy of inode in btree: */
  41         struct bch_inode_unpacked ei_inode;
  42 };
  43
  44 #define bch2_pagecache_add_put(i)       bch2_two_state_unlock(&i->ei_pagecache_lock, 0)
  45 #define bch2_pagecache_add_tryget(i)    bch2_two_state_trylock(&i->ei_pagecache_lock, 0)
  46 #define bch2_pagecache_add_get(i)       bch2_two_state_lock(&i->ei_pagecache_lock, 0)
  47
  48 #define bch2_pagecache_block_put(i)     bch2_two_state_unlock(&i->ei_pagecache_lock, 1)
  49 #define bch2_pagecache_block_get(i)     bch2_two_state_lock(&i->ei_pagecache_lock, 1)
  50
  51 static inline subvol_inum inode_inum(struct bch_inode_info *inode)
  52 {
  53         return (subvol_inum) {
  54                 .subvol = inode->ei_subvol,
  55                 .inum   = inode->ei_inode.bi_inum,
  56         };
  57 }
  58
  59 /*
  60  * Set if we've gotten a btree error for this inode, and thus the vfs inode and
  61  * btree inode may be inconsistent:
  62  */
  63 #define EI_INODE_ERROR                  0
  64
  65 /*
  66  * Set in the inode is in a snapshot subvolume - we don't do quota accounting in
  67  * those:
  68  */
  69 #define EI_INODE_SNAPSHOT               1
  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_LOCK              = (1U << 0),
  81         INODE_PAGECACHE_BLOCK   = (1U << 1),
  82         INODE_UPDATE_LOCK       = (1U << 2),
  83 };
  84
  85 #define bch2_lock_inodes(_locks, ...)                                   \
  86 do {                                                                    \
  87         struct bch_inode_info *a[] = { NULL, __VA_ARGS__ };             \
  88         unsigned i;                                                     \
  89                                                                         \
  90         bubble_sort(&a[1], ARRAY_SIZE(a) - 1, ptrcmp);                  \
  91                                                                         \
  92         for (i = 1; i < ARRAY_SIZE(a); i++)                             \
  93                 if (a[i] != a[i - 1]) {                                 \
  94                         if ((_locks) & INODE_LOCK)                      \
  95                                 down_write_nested(&a[i]->v.i_rwsem, i); \
  96                         if ((_locks) & INODE_PAGECACHE_BLOCK)           \
  97                                 bch2_pagecache_block_get(a[i]);\
  98                         if ((_locks) & INODE_UPDATE_LOCK)                       \
  99                                 mutex_lock_nested(&a[i]->ei_update_lock, i);\
 100                 }                                                       \
 101 } while (0)
 102
 103 #define bch2_unlock_inodes(_locks, ...)                                 \
 104 do {                                                                    \
 105         struct bch_inode_info *a[] = { NULL, __VA_ARGS__ };             \
 106         unsigned i;                                                     \
 107                                                                         \
 108         bubble_sort(&a[1], ARRAY_SIZE(a) - 1, ptrcmp);                  \
 109                                                                         \
 110         for (i = 1; i < ARRAY_SIZE(a); i++)                             \
 111                 if (a[i] != a[i - 1]) {                                 \
 112                         if ((_locks) & INODE_LOCK)                      \
 113                                 up_write(&a[i]->v.i_rwsem);             \
 114                         if ((_locks) & INODE_PAGECACHE_BLOCK)           \
 115                                 bch2_pagecache_block_put(a[i]);\
 116                         if ((_locks) & INODE_UPDATE_LOCK)                       \
 117                                 mutex_unlock(&a[i]->ei_update_lock);    \
 118                 }                                                       \
 119 } while (0)
 120
 121 static inline struct bch_inode_info *file_bch_inode(struct file *file)
 122 {
 123         return to_bch_ei(file_inode(file));
 124 }
 125
 126 static inline bool inode_attr_changing(struct bch_inode_info *dir,
 127                                 struct bch_inode_info *inode,
 128                                 enum inode_opt_id id)
 129 {
 130         return !(inode->ei_inode.bi_fields_set & (1 << id)) &&
 131                 bch2_inode_opt_get(&dir->ei_inode, id) !=
 132                 bch2_inode_opt_get(&inode->ei_inode, id);
 133 }
 134
 135 static inline bool inode_attrs_changing(struct bch_inode_info *dir,
 136                                  struct bch_inode_info *inode)
 137 {
 138         unsigned id;
 139
 140         for (id = 0; id < Inode_opt_nr; id++)
 141                 if (inode_attr_changing(dir, inode, id))
 142                         return true;
 143
 144         return false;
 145 }
 146
 147 struct bch_inode_unpacked;
 148
 149 #ifndef NO_BCACHEFS_FS
 150
 151 struct bch_inode_info *
 152 __bch2_create(struct mnt_idmap *, struct bch_inode_info *,
 153               struct dentry *, umode_t, dev_t, subvol_inum, unsigned);
 154
 155 int bch2_fs_quota_transfer(struct bch_fs *,
 156                            struct bch_inode_info *,
 157                            struct bch_qid,
 158                            unsigned,
 159                            enum quota_acct_mode);
 160
 161 static inline int bch2_set_projid(struct bch_fs *c,
 162                                   struct bch_inode_info *inode,
 163                                   u32 projid)
 164 {
 165         struct bch_qid qid = inode->ei_qid;
 166
 167         qid.q[QTYP_PRJ] = projid;
 168
 169         return bch2_fs_quota_transfer(c, inode, qid,
 170                                       1 << QTYP_PRJ,
 171                                       KEY_TYPE_QUOTA_PREALLOC);
 172 }
 173
 174 struct inode *bch2_vfs_inode_get(struct bch_fs *, subvol_inum);
 175
 176 /* returns 0 if we want to do the update, or error is passed up */
 177 typedef int (*inode_set_fn)(struct bch_inode_info *,
 178                             struct bch_inode_unpacked *, void *);
 179
 180 void bch2_inode_update_after_write(struct btree_trans *,
 181                                    struct bch_inode_info *,
 182                                    struct bch_inode_unpacked *,
 183                                    unsigned);
 184 int __must_check bch2_write_inode(struct bch_fs *, struct bch_inode_info *,
 185                                   inode_set_fn, void *, unsigned);
 186
 187 int bch2_setattr_nonsize(struct mnt_idmap *,
 188                          struct bch_inode_info *,
 189                          struct iattr *);
 190 int __bch2_unlink(struct inode *, struct dentry *, bool);
 191
 192 void bch2_evict_subvolume_inodes(struct bch_fs *, snapshot_id_list *);
 193
 194 void bch2_vfs_exit(void);
 195 int bch2_vfs_init(void);
 196
 197 #else
 198
 199 static inline void bch2_evict_subvolume_inodes(struct bch_fs *c,
 200                                                snapshot_id_list *s) {}
 201 static inline void bch2_vfs_exit(void) {}
 202 static inline int bch2_vfs_init(void) { return 0; }
 203
 204 #endif /* NO_BCACHEFS_FS */
 205
 206 #endif /* _BCACHEFS_FS_H */