fs/ext4/super.c

File Facts

System

Linux kernel

Corpus path

fs/ext4/super.c

Extension

.c

Size

216306 bytes

Lines

7614

Domain

Core OS

Bucket

VFS And Filesystem Core

Inferred role

Core OS: exported/initcall integration point

Status

integration 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.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• 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

• linux/module.h
• linux/string.h
• linux/fs.h
• linux/time.h
• linux/vmalloc.h
• linux/slab.h
• linux/init.h
• linux/blkdev.h
• linux/backing-dev.h
• linux/parser.h
• linux/buffer_head.h
• linux/exportfs.h
• linux/vfs.h
• linux/random.h
• linux/mount.h
• linux/namei.h
• linux/quotaops.h
• linux/seq_file.h
• linux/ctype.h
• linux/log2.h
• linux/crc16.h
• linux/dax.h
• linux/uaccess.h
• linux/iversion.h
• linux/unicode.h
• linux/part_stat.h
• linux/kthread.h
• linux/freezer.h
• linux/fsnotify.h
• linux/fs_context.h
• linux/fs_parser.h
• linux/fserror.h

Detected Declarations

• struct ext4_err_translation
• struct ext4_fs_context
• struct ext4_mount_options
• function __ext4_read_bh
• function ext4_read_bh_nowait
• function ext4_read_bh
• function ext4_read_bh_lock
• function __bread_gfp
• function ext4_sb_breadahead_unmovable
• function ext4_verify_csum_type
• function ext4_superblock_csum
• function ext4_superblock_csum_verify
• function ext4_superblock_csum_set
• function ext4_block_bitmap
• function ext4_inode_bitmap
• function ext4_inode_table
• function ext4_free_group_clusters
• function ext4_free_inodes_count
• function ext4_used_dirs_count
• function ext4_itable_unused_count
• function ext4_block_bitmap_set
• function ext4_inode_bitmap_set
• function ext4_inode_table_set
• function ext4_free_group_clusters_set
• function ext4_free_inodes_set
• function ext4_used_dirs_set
• function ext4_itable_unused_set
• function __ext4_update_tstamp
• function __ext4_get_tstamp
• function ktime_get_real_seconds
• function ext4_journal_commit_callback
• function ext4_journalled_writepage_needs_redirty
• function ext4_journalled_submit_inode_data_buffers
• function writeback_iter
• function ext4_journal_submit_inode_data_buffers
• function ext4_journal_finish_inode_data_buffers
• function system_going_down
• function ext4_errno_to_code
• function save_error_info
• function ext4_handle_error
• function update_super_work
• function ___ratelimit
• function __ext4_error_inode
• function __ext4_error_file
• function __ext4_std_error
• function __ext4_msg
• function ext4_warning_ratelimit
• function __ext4_warning

Annotated Snippet

module_init(ext4_init_fs)
module_exit(ext4_exit_fs)

Annotation

• Immediate include surface: `linux/module.h`, `linux/string.h`, `linux/fs.h`, `linux/time.h`, `linux/vmalloc.h`, `linux/slab.h`, `linux/init.h`, `linux/blkdev.h`.
• Detected declarations: `struct ext4_err_translation`, `struct ext4_fs_context`, `struct ext4_mount_options`, `function __ext4_read_bh`, `function ext4_read_bh_nowait`, `function ext4_read_bh`, `function ext4_read_bh_lock`, `function __bread_gfp`, `function ext4_sb_breadahead_unmovable`, `function ext4_verify_csum_type`.
• Atlas domain: Core OS / VFS And Filesystem Core.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

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.