Win: Use POSIX rename semantics for std::fs::rename if available
#131072
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
…available Windows 10 1601 introduced `FileRenameInfoEx` as well as `FILE_RENAME_FLAG_POSIX_SEMANTICS`, allowing for atomic renaming. If it isn't supported, we fall back to `FileRenameInfo`. This commit also replicates `MoveFileExW`'s behavior of checking whether the source file is a mount point and moving the mount point instead of resolving the target path.
… opened and for renaming over a non-empty directory
|
r? @ChrisDenton rustbot has assigned @ChrisDenton. Use |
rustbot
added
O-windows
|
This looks good to me.
Yes, I'd prefer if we just did that. Doing so doesn't appear to require anything special and the less the |
ChrisDenton
reviewed
Oct 21, 2024
|
Thanks! @bors r+ |
bors
added
S-waiting-on-bors
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
4 participants
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Windows 10 1601 introduced
FileRenameInfoExas well asFILE_RENAME_FLAG_POSIX_SEMANTICS, allowing for atomic renaming and renaming if the target file is has already been opened withFILE_SHARE_DELETE, in which case the file gets renamed on disk while the open file handle still refers to the old file, just like in POSIX. This resolves #123985, where atomic renaming proved difficult to impossible due to race conditions.If
FileRenameInfoExisn't available due to missing support from the underlying filesystem or missing OS support, the renaming is retried withFileRenameInfo, which matches the behavior ofMoveFileEx.This PR also manually replicates parts of
MoveFileEx's internal logic, as reverse-engineered from the disassembly: If the source file is a reparse point and said reparse point is a mount point, the mount point itself gets renamed; otherwise the reparse point is resolved and the result renamed.Notes:
win7target doesn't bother withFileRenameInfoExat all; it's probably desirable to remove that special casing and tryFileRenameInfoExanyway if it doesn't exist, in case the binary is run on newer OS versions.Fixes #123985