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         unsigned long           ei_flags;
  17
  18         struct mutex            ei_update_lock;
  19         u64                     ei_quota_reserved;
  20         unsigned long           ei_last_dirtied;
  21         two_state_lock_t        ei_pagecache_lock;
  22
  23         struct mutex            ei_quota_lock;
  24         struct bch_qid          ei_qid;
  25
  26         u32                     ei_subvol;
  27
  28         /*
  29          * When we've been doing nocow writes we'll need to issue flushes to the
  30          * underlying block devices
  31          *
  32          * XXX: a device may have had a flush issued by some other codepath. It
  33          * would be better to keep for each device a sequence number that's
  34          * incremented when we isusue a cache flush, and track here the sequence
  35          * number that needs flushing.
  36          */
  37         struct bch_devs_mask    ei_devs_need_flush;
  38
  39         /* copy of inode in btree: */
  40         struct bch_inode_unpacked ei_inode;
  41 };
  42
  43 #define bch2_pagecache_add_put(i)       bch2_two_state_unlock(&i->ei_pagecache_lock, 0)
  44 #define bch2_pagecache_add_tryget(i)    bch2_two_state_trylock(&i->ei_pagecache_lock, 0)
  45 #define bch2_pagecache_add_get(i)       bch2_two_state_lock(&i->ei_pagecache_lock, 0)
  46
  47 #define bch2_pagecache_block_put(i)     bch2_two_state_unlock(&i->ei_pagecache_lock, 1)
  48 #define bch2_pagecache_block_get(i)     bch2_two_state_lock(&i->ei_pagecache_lock, 1)
  49
  50 static inline subvol_inum inode_inum(struct bch_inode_info *inode)
  51 {
  52         return (subvol_inum) {
  53                 .subvol = inode->ei_subvol,
  54                 .inum   = inode->ei_inode.bi_inum,
  55         };
  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
  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_LOCK              = (1U << 0),
  80         INODE_PAGECACHE_BLOCK   = (1U << 1),
  81         INODE_UPDATE_LOCK       = (1U << 2),
  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_LOCK)                      \
  94                                 down_write_nested(&a[i]->v.i_rwsem, i); \
  95                         if ((_locks) & INODE_PAGECACHE_BLOCK)           \
  96                                 bch2_pagecache_block_get(a[i]);\
  97                         if ((_locks) & INODE_UPDATE_LOCK)                       \
  98                                 mutex_lock_nested(&a[i]->ei_update_lock, i);\
  99                 }                                                       \
 100 } while (0)
 101
 102 #define bch2_unlock_inodes(_locks, ...)                                 \
 103 do {                                                                    \
 104         struct bch_inode_info *a[] = { NULL, __VA_ARGS__ };             \
 105         unsigned i;                                                     \
 106                                                                         \
 107         bubble_sort(&a[1], ARRAY_SIZE(a) - 1, ptrcmp);                  \
 108                                                                         \
 109         for (i = 1; i < ARRAY_SIZE(a); i++)                             \
 110                 if (a[i] != a[i - 1]) {                                 \
 111                         if ((_locks) & INODE_LOCK)                      \
 112                                 up_write(&a[i]->v.i_rwsem);             \
 113                         if ((_locks) & INODE_PAGECACHE_BLOCK)           \
 114                                 bch2_pagecache_block_put(a[i]);\
 115                         if ((_locks) & INODE_UPDATE_LOCK)                       \
 116                                 mutex_unlock(&a[i]->ei_update_lock);    \
 117                 }                                                       \
 118 } while (0)
 119
 120 static inline struct bch_inode_info *file_bch_inode(struct file *file)
 121 {
 122         return to_bch_ei(file_inode(file));
 123 }
 124
 125 static inline bool inode_attr_changing(struct bch_inode_info *dir,
 126                                 struct bch_inode_info *inode,
 127                                 enum inode_opt_id id)
 128 {
 129         return !(inode->ei_inode.bi_fields_set & (1 << id)) &&
 130                 bch2_inode_opt_get(&dir->ei_inode, id) !=
 131                 bch2_inode_opt_get(&inode->ei_inode, id);
 132 }
 133
 134 static inline bool inode_attrs_changing(struct bch_inode_info *dir,
 135                                  struct bch_inode_info *inode)
 136 {
 137         unsigned id;
 138
 139         for (id = 0; id < Inode_opt_nr; id++)
 140                 if (inode_attr_changing(dir, inode, id))
 141                         return true;
 142
 143         return false;
 144 }
 145
 146 struct bch_inode_unpacked;
 147
 148 #ifndef NO_BCACHEFS_FS
 149
 150 struct bch_inode_info *
 151 __bch2_create(struct user_namespace *, struct bch_inode_info *,
 152               struct dentry *, umode_t, dev_t, subvol_inum, unsigned);
 153
 154 int bch2_fs_quota_transfer(struct bch_fs *,
 155                            struct bch_inode_info *,
 156                            struct bch_qid,
 157                            unsigned,
 158                            enum quota_acct_mode);
 159
 160 static inline int bch2_set_projid(struct bch_fs *c,
 161                                   struct bch_inode_info *inode,
 162                                   u32 projid)
 163 {
 164         struct bch_qid qid = inode->ei_qid;
 165
 166         qid.q[QTYP_PRJ] = projid;
 167
 168         return bch2_fs_quota_transfer(c, inode, qid,
 169                                       1 << QTYP_PRJ,
 170                                       KEY_TYPE_QUOTA_PREALLOC);
 171 }
 172
 173 struct inode *bch2_vfs_inode_get(struct bch_fs *, subvol_inum);
 174
 175 /* returns 0 if we want to do the update, or error is passed up */
 176 typedef int (*inode_set_fn)(struct bch_inode_info *,
 177                             struct bch_inode_unpacked *, void *);
 178
 179 void bch2_inode_update_after_write(struct btree_trans *,
 180                                    struct bch_inode_info *,
 181                                    struct bch_inode_unpacked *,
 182                                    unsigned);
 183 int __must_check bch2_write_inode(struct bch_fs *, struct bch_inode_info *,
 184                                   inode_set_fn, void *, unsigned);
 185
 186 int bch2_setattr_nonsize(struct user_namespace *,
 187                          struct bch_inode_info *,
 188                          struct iattr *);
 189 int __bch2_unlink(struct inode *, struct dentry *, bool);
 190
 191 void bch2_evict_subvolume_inodes(struct bch_fs *, snapshot_id_list *);
 192
 193 void bch2_vfs_exit(void);
 194 int bch2_vfs_init(void);
 195
 196 #else
 197
 198 static inline void bch2_evict_subvolume_inodes(struct bch_fs *c,
 199                                                snapshot_id_list *s) {}
 200 static inline void bch2_vfs_exit(void) {}
 201 static inline int bch2_vfs_init(void) { return 0; }
 202
 203 #endif /* NO_BCACHEFS_FS */
 204
 205 #endif /* _BCACHEFS_FS_H */