fiemap_prep(9)

✨ NAME ✨

fiemap_prep(9) from the Kernel API Manual — okay bestie, this one is all about checking the validity of requested flags for fiemap. It's giving flag-bouncer-at-the-club energy 💅.

🎀 SYNOPSIS 🎀

int fiemap_prep (struct inode *inode , struct fiemap_extent_info
*fieinfo , u64 start , u64 *len , u32 supported_flags );

🌸 ARGUMENTS 🌸

• inode — the inode to operate on 🫶.
• fieinfo — the fiemap context passed into ->fiemap ✨.
• start — start of the mapped range 🌈.
• len — length of the mapped range, and yes, it can be truncated by this function 👀.
• supported_flags — the set of fiemap flags that the file system understands 💖.

🔥 DESCRIPTION 🔥

Okay so this function must be called from each ->fiemap instance to validate the fiemap request against the file system parameters. Mandatory behavior, no cap 😌.

It returns 0 on success, or a negative error on failure. That's the whole vibe 💀✨.

🦋 SEE ALSO 🦋

• Kernel file ./fs/ioctl.c — plus vfs_ioctl(9), fiemap_fill_next_extent(9), and compat_ptr_ioctl(9) 🎀.

mwah 💋 — this iconic page is sourced from ./fs, dated October 2026, and it's literally titled fiemap_prep(9). periodt 🧚💜