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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _BCACHEFS_FS_IO_PAGECACHE_H
#define _BCACHEFS_FS_IO_PAGECACHE_H
#include <linux/pagemap.h>
typedef DARRAY(struct folio *) folios;
int bch2_filemap_get_contig_folios_d(struct address_space *, loff_t,
u64, fgf_t, gfp_t, folios *);
int bch2_write_invalidate_inode_pages_range(struct address_space *, loff_t, loff_t);
/*
* Use u64 for the end pos and sector helpers because if the folio covers the
* max supported range of the mapping, the start offset of the next folio
* overflows loff_t. This breaks much of the range based processing in the
* buffered write path.
*/
static inline u64 folio_end_pos(struct folio *folio)
{
return folio_pos(folio) + folio_size(folio);
}
static inline size_t folio_sectors(struct folio *folio)
{
return PAGE_SECTORS << folio_order(folio);
}
static inline loff_t folio_sector(struct folio *folio)
{
return folio_pos(folio) >> 9;
}
static inline u64 folio_end_sector(struct folio *folio)
{
return folio_end_pos(folio) >> 9;
}
#define BCH_FOLIO_SECTOR_STATE() \
x(unallocated) \
x(reserved) \
x(dirty) \
x(dirty_reserved) \
x(allocated)
enum bch_folio_sector_state {
#define x(n) SECTOR_##n,
BCH_FOLIO_SECTOR_STATE()
#undef x
};
struct bch_folio_sector {
/* Uncompressed, fully allocated replicas (or on disk reservation): */
u8 nr_replicas:4,
/* Owns PAGE_SECTORS * replicas_reserved sized in memory reservation: */
replicas_reserved:4;
u8 state;
};
struct bch_folio {
spinlock_t lock;
atomic_t write_count;
/*
* Is the sector state up to date with the btree?
* (Not the data itself)
*/
bool uptodate;
struct bch_folio_sector s[];
};
/* Helper for when we need to add debug instrumentation: */
static inline void bch2_folio_sector_set(struct folio *folio,
struct bch_folio *s,
unsigned i, unsigned n)
{
s->s[i].state = n;
}
/* file offset (to folio offset) to bch_folio_sector index */
static inline int folio_pos_to_s(struct folio *folio, loff_t pos)
{
u64 f_offset = pos - folio_pos(folio);
BUG_ON(pos < folio_pos(folio) || pos >= folio_end_pos(folio));
return f_offset >> SECTOR_SHIFT;
}
/* for newly allocated folios: */
static inline void __bch2_folio_release(struct folio *folio)
{
kfree(folio_detach_private(folio));
}
static inline void bch2_folio_release(struct folio *folio)
{
EBUG_ON(!folio_test_locked(folio));
__bch2_folio_release(folio);
}
static inline struct bch_folio *__bch2_folio(struct folio *folio)
{
return folio_get_private(folio);
}
static inline struct bch_folio *bch2_folio(struct folio *folio)
{
EBUG_ON(!folio_test_locked(folio));
return __bch2_folio(folio);
}
struct bch_folio *__bch2_folio_create(struct folio *, gfp_t);
struct bch_folio *bch2_folio_create(struct folio *, gfp_t);
struct bch2_folio_reservation {
struct disk_reservation disk;
struct quota_res quota;
};
static inline unsigned inode_nr_replicas(struct bch_fs *c, struct bch_inode_info *inode)
{
/* XXX: this should not be open coded */
return inode->ei_inode.bi_data_replicas
? inode->ei_inode.bi_data_replicas - 1
: c->opts.data_replicas;
}
static inline void bch2_folio_reservation_init(struct bch_fs *c,
struct bch_inode_info *inode,
struct bch2_folio_reservation *res)
{
memset(res, 0, sizeof(*res));
res->disk.nr_replicas = inode_nr_replicas(c, inode);
}
int bch2_folio_set(struct bch_fs *, subvol_inum, struct folio **, unsigned);
void bch2_bio_page_state_set(struct bio *, struct bkey_s_c);
void bch2_mark_pagecache_unallocated(struct bch_inode_info *, u64, u64);
int bch2_mark_pagecache_reserved(struct bch_inode_info *, u64 *, u64, bool);
int bch2_get_folio_disk_reservation(struct bch_fs *,
struct bch_inode_info *,
struct folio *, bool);
void bch2_folio_reservation_put(struct bch_fs *,
struct bch_inode_info *,
struct bch2_folio_reservation *);
int bch2_folio_reservation_get(struct bch_fs *,
struct bch_inode_info *,
struct folio *,
struct bch2_folio_reservation *,
size_t, size_t);
ssize_t bch2_folio_reservation_get_partial(struct bch_fs *,
struct bch_inode_info *,
struct folio *,
struct bch2_folio_reservation *,
size_t, size_t);
void bch2_set_folio_dirty(struct bch_fs *,
struct bch_inode_info *,
struct folio *,
struct bch2_folio_reservation *,
unsigned, unsigned);
vm_fault_t bch2_page_fault(struct vm_fault *);
vm_fault_t bch2_page_mkwrite(struct vm_fault *);
void bch2_invalidate_folio(struct folio *, size_t, size_t);
bool bch2_release_folio(struct folio *, gfp_t);
loff_t bch2_seek_pagecache_data(struct inode *, loff_t, loff_t, unsigned, bool);
loff_t bch2_seek_pagecache_hole(struct inode *, loff_t, loff_t, unsigned, bool);
int bch2_clamp_data_hole(struct inode *, u64 *, u64 *, unsigned, bool);
#endif /* _BCACHEFS_FS_IO_PAGECACHE_H */
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