1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _BCACHEFS_FS_IO_PAGECACHE_H 3 #define _BCACHEFS_FS_IO_PAGECACHE_H 4 5 #include <linux/pagemap.h> 6 7 typedef DARRAY(struct folio *) folios; 8 9 int bch2_filemap_get_contig_folios_d(struct address_space *, loff_t, 10 u64, fgf_t, gfp_t, folios *); 11 int bch2_write_invalidate_inode_pages_range(struct address_space *, loff_t, loff_t); 12 13 /* 14 * Use u64 for the end pos and sector helpers because if the folio covers the 15 * max supported range of the mapping, the start offset of the next folio 16 * overflows loff_t. This breaks much of the range based processing in the 17 * buffered write path. 18 */ 19 static inline u64 folio_end_pos(struct folio *folio) 20 { 21 return folio_pos(folio) + folio_size(folio); 22 } 23 24 static inline size_t folio_sectors(struct folio *folio) 25 { 26 return PAGE_SECTORS << folio_order(folio); 27 } 28 29 static inline loff_t folio_sector(struct folio *folio) 30 { 31 return folio_pos(folio) >> 9; 32 } 33 34 static inline u64 folio_end_sector(struct folio *folio) 35 { 36 return folio_end_pos(folio) >> 9; 37 } 38 39 #define BCH_FOLIO_SECTOR_STATE() \ 40 x(unallocated) \ 41 x(reserved) \ 42 x(dirty) \ 43 x(dirty_reserved) \ 44 x(allocated) 45 46 enum bch_folio_sector_state { 47 #define x(n) SECTOR_##n, 48 BCH_FOLIO_SECTOR_STATE() 49 #undef x 50 }; 51 52 struct bch_folio_sector { 53 /* Uncompressed, fully allocated replicas (or on disk reservation): */ 54 u8 nr_replicas:4, 55 /* Owns PAGE_SECTORS * replicas_reserved sized in memory reservation: */ 56 replicas_reserved:4; 57 u8 state; 58 }; 59 60 struct bch_folio { 61 spinlock_t lock; 62 atomic_t write_count; 63 /* 64 * Is the sector state up to date with the btree? 65 * (Not the data itself) 66 */ 67 bool uptodate; 68 struct bch_folio_sector s[]; 69 }; 70 71 /* Helper for when we need to add debug instrumentation: */ 72 static inline void bch2_folio_sector_set(struct folio *folio, 73 struct bch_folio *s, 74 unsigned i, unsigned n) 75 { 76 s->s[i].state = n; 77 } 78 79 /* file offset (to folio offset) to bch_folio_sector index */ 80 static inline int folio_pos_to_s(struct folio *folio, loff_t pos) 81 { 82 u64 f_offset = pos - folio_pos(folio); 83 84 BUG_ON(pos < folio_pos(folio) || pos >= folio_end_pos(folio)); 85 return f_offset >> SECTOR_SHIFT; 86 } 87 88 /* for newly allocated folios: */ 89 static inline void __bch2_folio_release(struct folio *folio) 90 { 91 kfree(folio_detach_private(folio)); 92 } 93 94 static inline void bch2_folio_release(struct folio *folio) 95 { 96 EBUG_ON(!folio_test_locked(folio)); 97 __bch2_folio_release(folio); 98 } 99 100 static inline struct bch_folio *__bch2_folio(struct folio *folio) 101 { 102 return folio_has_private(folio) 103 ? (struct bch_folio *) folio_get_private(folio) 104 : NULL; 105 } 106 107 static inline struct bch_folio *bch2_folio(struct folio *folio) 108 { 109 EBUG_ON(!folio_test_locked(folio)); 110 111 return __bch2_folio(folio); 112 } 113 114 struct bch_folio *__bch2_folio_create(struct folio *, gfp_t); 115 struct bch_folio *bch2_folio_create(struct folio *, gfp_t); 116 117 struct bch2_folio_reservation { 118 struct disk_reservation disk; 119 struct quota_res quota; 120 }; 121 122 static inline unsigned inode_nr_replicas(struct bch_fs *c, struct bch_inode_info *inode) 123 { 124 /* XXX: this should not be open coded */ 125 return inode->ei_inode.bi_data_replicas 126 ? inode->ei_inode.bi_data_replicas - 1 127 : c->opts.data_replicas; 128 } 129 130 static inline void bch2_folio_reservation_init(struct bch_fs *c, 131 struct bch_inode_info *inode, 132 struct bch2_folio_reservation *res) 133 { 134 memset(res, 0, sizeof(*res)); 135 136 res->disk.nr_replicas = inode_nr_replicas(c, inode); 137 } 138 139 int bch2_folio_set(struct bch_fs *, subvol_inum, struct folio **, unsigned); 140 void bch2_bio_page_state_set(struct bio *, struct bkey_s_c); 141 142 void bch2_mark_pagecache_unallocated(struct bch_inode_info *, u64, u64); 143 int bch2_mark_pagecache_reserved(struct bch_inode_info *, u64 *, u64, bool); 144 145 int bch2_get_folio_disk_reservation(struct bch_fs *, 146 struct bch_inode_info *, 147 struct folio *, bool); 148 149 void bch2_folio_reservation_put(struct bch_fs *, 150 struct bch_inode_info *, 151 struct bch2_folio_reservation *); 152 int bch2_folio_reservation_get(struct bch_fs *, 153 struct bch_inode_info *, 154 struct folio *, 155 struct bch2_folio_reservation *, 156 size_t, size_t); 157 ssize_t bch2_folio_reservation_get_partial(struct bch_fs *, 158 struct bch_inode_info *, 159 struct folio *, 160 struct bch2_folio_reservation *, 161 size_t, size_t); 162 163 void bch2_set_folio_dirty(struct bch_fs *, 164 struct bch_inode_info *, 165 struct folio *, 166 struct bch2_folio_reservation *, 167 unsigned, unsigned); 168 169 vm_fault_t bch2_page_fault(struct vm_fault *); 170 vm_fault_t bch2_page_mkwrite(struct vm_fault *); 171 void bch2_invalidate_folio(struct folio *, size_t, size_t); 172 bool bch2_release_folio(struct folio *, gfp_t); 173 174 loff_t bch2_seek_pagecache_data(struct inode *, loff_t, loff_t, unsigned, bool); 175 loff_t bch2_seek_pagecache_hole(struct inode *, loff_t, loff_t, unsigned, bool); 176 int bch2_clamp_data_hole(struct inode *, u64 *, u64 *, unsigned, bool); 177 178 #endif /* _BCACHEFS_FS_IO_PAGECACHE_H */ 179