safe_hardlink_source(9)

🎀 safe_hardlink_source(9) 🎀

okay so this is the Kernel API Manual page for safe_hardlink_source(9), and it is literally about checking for safe hardlink conditions. Bestie, we’re doing this with full facts and full sparkle. 💅✨

🌸 NAME 🌸

safe_hardlink_source — check for safe hardlink conditions. That’s the whole assignment. 💖

✨ SYNOPSIS ✨

Here’s the signature, exactly as it is:

bool safe_hardlink_source (struct mnt_idmap *idmap , struct inode *inode
);

It returns a bool, so yes/no energy only. 🎀

🦋 ARGUMENTS 🦋

• idmap — idmap of the mount the inode was found from. tracking the mount origin, iconic.
• inode — the source inode to hardlink from. the source inode, front and center.

💜 DESCRIPTION 💜

It returns false if at least one of these conditions applies, bestie — not a drill:

• inode is not a regular file
• inode is setuid
• inode is setgid and group-exec
• access failure for read and write

Otherwise it returns true. slay, that’s the whole decision tree. ✨

🌈 SEE ALSO 🌈

Kernel file ./fs/namei.c is named here, and the whole reference squad follows — every single one, in order, no skips: 💫

• Kernel file ./fs/namei.c: check_acl(9), acl_permission_check(9), generic_permission(9), do_inode_permission(9), sb_permission(9), inode_permission(9), path_get(9), path_put(9), path_connected(9), try_to_unlazy(9), try_to_unlazy_next(9), complete_walk(9).
• may_follow_link(9), may_linkat(9), may_create_in_sticky(9), lookup_fast(9), start_dirop(9), end_dirop(9), kern_path_parent(9), vfs_path_parent_lookup(9), vfs_path_lookup(9), try_lookup_noperm(9), lookup_noperm(9), lookup_one(9), lookup_one_unlocked(9).
• lookup_one_positive_killable(9), lookup_one_positive_unlocked(9), lookup_noperm_unlocked(9), start_creating(9), start_removing(9), start_creating_killable(9), start_removing_killable(9), start_creating_noperm(9), start_removing_noperm(9), start_creating_dentry(9), start_removing_dentry(9), __start_renaming(9).
• start_renaming(9), start_renaming_dentry(9), start_renaming_two_dentries(9), vfs_prepare_mode(9), vfs_create(9), atomic_open(9), vfs_lookup_open(9), vfs_tmpfile(9), kernel_tmpfile_open(9), end_creating_path(9), dentry_create(9).
• vfs_mknod(9), vfs_mkdir(9), vfs_rmdir(9), vfs_unlink(9), vfs_symlink(9), vfs_link(9), vfs_rename(9), vfs_readlink(9), vfs_get_link(9), page_get_link(9), page_put_link(9).

source/version: ./fs • date: October 2026 — that’s the cute sign-off, bestie, mwah 💋🎀💖