vfs_fsync_range(9)

💅 vfs_fsync_range(9) 💅

okay so this is the Kernel API Manual page for vfs_fsync_range, and it is literally a helper to sync a range of data & metadata to disk. bestie, it's giving “make sure your bytes are actually on disk” energy. ✨

🌸 NAME 🌸

vfs_fsync_range — helper to sync a range of data & metadata to disk 🫶

🦋 SYNOPSIS 🦋

int vfs_fsync_range (struct file *file , loff_t start , loff_t end , int datasync );

🎀 ARGUMENTS 🎀

• file — file to sync. like, the file you're syncing, no mystery there 💖
• start — offset in bytes of the beginning of data range to sync.
• end — offset in bytes of the end of data range (inclusive). yes, inclusive — the end byte is included, okay? 😭
• datasync — perform only datasync. that's it, that's the whole vibe for this one.

🔥 DESCRIPTION 🔥

Write back data in range start..end and metadata for file to disk. If datasync is set, only metadata needed to access modified file data is written. periodt. 💅

vibe check: keep start..end and the datasync behaviour exactly as written — end is inclusive, and datasync means only that specific metadata gets written. no extra lore, bestie. 🧚

🌈 SEE ALSO 🌈

Kernel file ./fs/sync.c, vfs_fsync(9) 👑

kisses from the ./fs source corner, October 2026, vfs_fsync_range(9) edition — mwah 💖