Re: [f2fs-dev] [PATCH] f2fs: reject overlapping move range after len expansion

Hello:

This patch was applied to jaegeuk/f2fs.git (dev)
by Jaegeuk Kim <[email protected]>:

On Wed,  8 Jul 2026 14:54:39 +0800 you wrote:
> F2FS_IOC_MOVE_RANGE treats a zero length as a request to move data
> from pos_in to EOF. However, the same-file overlap check runs before
> that expansion, so a request with len == 0 bypasses the overlap
> rejection added for same-file moves.
> 
> For example, with a four-block file, moving from block 0 to block 1
> with len == 0 is accepted by the old check because pos_in + len is
> still pos_in at that point. The code then expands len to cover the
> rest of the file and calls __exchange_data_block() on overlapping
> source and destination ranges in the same inode, which is the
> data-corruption case the overlap check was meant to reject.
> 
> [...]

Here is the summary with links:
  - [f2fs-dev] f2fs: reject overlapping move range after len expansion
    https://git.kernel.org/jaegeuk/f2fs/c/28c1ef094e7c

You are awesome, thank you!
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