inode_query_iversion(9)

💖 inode_query_iversion(9) 💖

okay so bestie, welcome to the Kernel API Manual — today's main character is inode_query_iversion, and honestly? she's giving "quietly essential" and we're obsessed. ✨

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🌸 NAME 🌸

inode_query_iversion — read i_version for later use 🫶

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✨ SYNOPSIS ✨

u64 inode_query_iversion (struct inode *inode );

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🎀 ARGUMENTS 🎀

• inode — the inode you're pulling the i_version from, no cap 🌈

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🦋 DESCRIPTION 🦋

So here's the vibe: you read the inode's i_version counter. That's it. That's the function. 💅

This is the one you want if you're a caller who's planning to store the returned i_version so you can compare against it later. Because that's the whole point, bestie — this guarantees that if you query the i_version again later, you'll get a different value if literally anything has changed. Fr fr, that's the promise. 👑

Now into the implementation, because it's lowkey iconic: we fetch the current value, set the QUERIED flag, and then try to swap it into place with a cmpxchg — but only if it wasn't already set. If that swap fails? No stress, we just try again with the newly fetched value from the cmpxchg. Retry era. 🔥

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💜 SEE ALSO 💜

Under the Kernel file ./fs/libfs.c, we've got the whole friend group:

• simple_offset_init(9)
• simple_offset_add(9)
• simple_offset_remove(9)
• simple_offset_rename(9)
• simple_offset_rename_exchange(9)
• simple_offset_destroy(9)
• offset_dir_llseek(9)
• offset_readdir(9)
• simple_rename_timestamp(9)
• simple_setattr(9)
• simple_write_end(9)
• simple_read_from_buffer(9)
• simple_write_to_buffer(9)
• memory_read_from_buffer(9)
• generic_encode_ino32_fh(9)
• generic_fh_to_dentry(9)
• generic_fh_to_parent(9)
• simple_fsync_noflush(9)
• simple_fsync(9)
• generic_check_addressable(9)
• simple_get_link(9)
• generic_ci_d_compare(9)
• generic_ci_d_hash(9)
• generic_ci_match(9)
• generic_set_sb_d_ops(9)
• inode_maybe_inc_iversion(9)
• simple_inode_init_ts(9)
• path_from_stashed(9)
• simple_start_creating(9)

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and that's the page, bestie 🧚💖 sign-off time: this one lives over in ./fs, dated October 2026, and it's inode_query_iversion(9) — periodt. 🌸🎀🦋