fs/ext2/ext2.h

File Facts

System

Linux kernel

Corpus path

fs/ext2/ext2.h

Extension

.h

Size

28078 bytes

Lines

817

Domain

Core OS

Bucket

VFS And Filesystem Core

Inferred role

Core OS: operation-table or driver-model contract

Status

pattern 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.
• Defines an operation table; this is where Linux turns generic core objects into subsystem-specific behavior.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/fs.h
• linux/ext2_fs.h
• linux/blockgroup_lock.h
• linux/percpu_counter.h
• linux/rbtree.h
• linux/mm.h
• linux/highmem.h

Detected Declarations

• struct ext2_reserve_window
• struct ext2_reserve_window_node
• struct ext2_block_alloc_info
• struct mb_cache
• struct ext2_sb_info
• struct ext2_group_desc
• struct ext2_inode
• struct ext2_super_block
• struct ext2_dir_entry
• struct ext2_dir_entry_2
• struct ext2_mount_options
• struct ext2_inode_info
• function sb_bgl_lock
• function flags
• function verify_offsets
• function ext2_group_first_block_no
• function ext2_group_last_block_no

Annotated Snippet

extern const struct file_operations ext2_dir_operations;

/* file.c */
extern int ext2_fsync(struct file *file, loff_t start, loff_t end,
		      int datasync);
extern const struct inode_operations ext2_file_inode_operations;
extern const struct file_operations ext2_file_operations;

/* inode.c */
extern void ext2_set_file_ops(struct inode *inode);
extern const struct address_space_operations ext2_aops;
extern const struct iomap_ops ext2_iomap_ops;

/* namei.c */
extern const struct inode_operations ext2_dir_inode_operations;
extern const struct inode_operations ext2_special_inode_operations;

/* symlink.c */
extern const struct inode_operations ext2_fast_symlink_inode_operations;
extern const struct inode_operations ext2_symlink_inode_operations;

static inline ext2_fsblk_t
ext2_group_first_block_no(struct super_block *sb, unsigned long group_no)
{
	return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) +
		le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block);
}

static inline ext2_fsblk_t
ext2_group_last_block_no(struct super_block *sb, unsigned long group_no)
{
	struct ext2_sb_info *sbi = EXT2_SB(sb);

	if (group_no == sbi->s_groups_count - 1)
		return le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
	else
		return ext2_group_first_block_no(sb, group_no) +
			EXT2_BLOCKS_PER_GROUP(sb) - 1;
}

#define ext2_set_bit	__test_and_set_bit_le
#define ext2_clear_bit	__test_and_clear_bit_le
#define ext2_test_bit	test_bit_le
#define ext2_find_first_zero_bit	find_first_zero_bit_le
#define ext2_find_next_zero_bit		find_next_zero_bit_le

Annotation

• Immediate include surface: `linux/fs.h`, `linux/ext2_fs.h`, `linux/blockgroup_lock.h`, `linux/percpu_counter.h`, `linux/rbtree.h`, `linux/mm.h`, `linux/highmem.h`.
• Detected declarations: `struct ext2_reserve_window`, `struct ext2_reserve_window_node`, `struct ext2_block_alloc_info`, `struct mb_cache`, `struct ext2_sb_info`, `struct ext2_group_desc`, `struct ext2_inode`, `struct ext2_super_block`, `struct ext2_dir_entry`, `struct ext2_dir_entry_2`.
• Atlas domain: Core OS / VFS And Filesystem Core.
• Implementation status: pattern 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.