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 */ 216