fs/f2fs/iostat.h

File Facts

System

Linux kernel

Corpus path

fs/f2fs/iostat.h

Extension

.h

Size

2971 bytes

Lines

90

Domain

Core OS

Bucket

VFS And Filesystem Core

Inferred role

Core OS: implementation source

Status

source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

• Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• struct bio_post_read_ctx
• struct iostat_lat_info
• struct bio_iostat_ctx
• enum iostat_lat_type
• function iostat_update_submit_ctx
• function f2fs_update_iostat
• function f2fs_init_iostat_processing
• function f2fs_destroy_iostat_processing
• function f2fs_destroy_iostat

Annotated Snippet

struct iostat_lat_info {
	unsigned long sum_lat[MAX_IO_TYPE][NR_PAGE_TYPE];	/* sum of io latencies */
	unsigned long peak_lat[MAX_IO_TYPE][NR_PAGE_TYPE];	/* peak io latency */
	unsigned int bio_cnt[MAX_IO_TYPE][NR_PAGE_TYPE];	/* bio count */
};

extern int __maybe_unused iostat_info_seq_show(struct seq_file *seq,
			void *offset);
extern void f2fs_reset_iostat(struct f2fs_sb_info *sbi);
extern void f2fs_update_iostat(struct f2fs_sb_info *sbi, struct inode *inode,
			enum iostat_type type, unsigned long long io_bytes);
extern void f2fs_update_read_folio_count(struct f2fs_sb_info *sbi,
			struct folio *folio);

struct bio_iostat_ctx {
	struct f2fs_sb_info *sbi;
	unsigned long submit_ts;
	enum page_type type;
	struct bio_post_read_ctx *post_read_ctx;
};

static inline void iostat_update_submit_ctx(struct bio *bio,
			enum page_type type)
{
	struct bio_iostat_ctx *iostat_ctx = bio->bi_private;

	iostat_ctx->submit_ts = jiffies;
	iostat_ctx->type = type;
}

static inline struct bio_post_read_ctx *get_post_read_ctx(struct bio *bio)
{
	struct bio_iostat_ctx *iostat_ctx = bio->bi_private;

	return iostat_ctx->post_read_ctx;
}

extern void iostat_update_and_unbind_ctx(struct bio *bio);
extern void iostat_alloc_and_bind_ctx(struct f2fs_sb_info *sbi,
		struct bio *bio, struct bio_post_read_ctx *ctx);
extern int f2fs_init_iostat_processing(void);
extern void f2fs_destroy_iostat_processing(void);
extern int f2fs_init_iostat(struct f2fs_sb_info *sbi);
extern void f2fs_destroy_iostat(struct f2fs_sb_info *sbi);
#else
static inline void f2fs_update_iostat(struct f2fs_sb_info *sbi, struct inode *inode,
		enum iostat_type type, unsigned long long io_bytes) {}
static inline void f2fs_update_read_folio_count(struct f2fs_sb_info *sbi,
		struct folio *folio) {}
static inline void iostat_update_and_unbind_ctx(struct bio *bio) {}
static inline void iostat_alloc_and_bind_ctx(struct f2fs_sb_info *sbi,
		struct bio *bio, struct bio_post_read_ctx *ctx) {}
static inline void iostat_update_submit_ctx(struct bio *bio,
		enum page_type type) {}
static inline struct bio_post_read_ctx *get_post_read_ctx(struct bio *bio)
{
	return bio->bi_private;
}
static inline int f2fs_init_iostat_processing(void) { return 0; }
static inline void f2fs_destroy_iostat_processing(void) {}
static inline int f2fs_init_iostat(struct f2fs_sb_info *sbi) { return 0; }
static inline void f2fs_destroy_iostat(struct f2fs_sb_info *sbi) {}
#endif
#endif /* __F2FS_IOSTAT_H__ */

Annotation

• Detected declarations: `struct bio_post_read_ctx`, `struct iostat_lat_info`, `struct bio_iostat_ctx`, `enum iostat_lat_type`, `function iostat_update_submit_ctx`, `function f2fs_update_iostat`, `function f2fs_init_iostat_processing`, `function f2fs_destroy_iostat_processing`, `function f2fs_destroy_iostat`.
• Atlas domain: Core OS / VFS And Filesystem Core.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.