linux/fs/bcachefs/fs-io-pagecache.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _BCACHEFS_FS_IO_PAGECACHE_H
#define _BCACHEFS_FS_IO_PAGECACHE_H

#include <linux/pagemap.h>

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)
{ … }

static inline size_t folio_sectors(struct folio *folio)
{ … }

static inline loff_t folio_sector(struct folio *folio)
{ … }

static inline u64 folio_end_sector(struct folio *folio)
{ … }

#define BCH_FOLIO_SECTOR_STATE() …

enum bch_folio_sector_state { … };

struct bch_folio_sector { … };

struct bch_folio { … };

/* 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)
{ … }

/* file offset (to folio offset) to bch_folio_sector index */
static inline int folio_pos_to_s(struct folio *folio, loff_t pos)
{ … }

/* for newly allocated folios: */
static inline void __bch2_folio_release(struct folio *folio)
{ … }

static inline void bch2_folio_release(struct folio *folio)
{ … }

static inline struct bch_folio *__bch2_folio(struct folio *folio)
{ … }

static inline struct bch_folio *bch2_folio(struct 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 { … };

static inline unsigned inode_nr_replicas(struct bch_fs *c, struct bch_inode_info *inode)
{ … }

static inline void bch2_folio_reservation_init(struct bch_fs *c,
			struct bch_inode_info *inode,
			struct bch2_folio_reservation *res)
{ … }

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 */