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Linux Systems Field Manual

linux/fs/read-write.c

Imported from _research/manual-study-linux/file-notes/linux__fs__read_write.c.md.

File Notes: fs/read_write.c

Status: reviewed.

Purpose: read/write syscall path and file operation dispatch.

Evidence

  • rw_verify_area() at line 453 checks request boundaries before dispatch.
  • new_sync_read() at line 483 and new_sync_write() at line 585 adapt common synchronous file operations.
  • vfs_read() at line 554 and vfs_write() at line 667 are the generic VFS dispatch points.
  • ksys_read() appears at line 705, followed by SYSCALL_DEFINE3(read) at line 723.
  • ksys_write() appears at line 728, followed by SYSCALL_DEFINE3(write) at line 747.

Design Notes

The syscall wrappers do not know every file implementation. They validate the request and dispatch through file operations. Rust should mirror this with a small syscall/handle layer and trait-backed object behavior.