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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2024-09-19 06:33:18 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2024-09-19 06:33:18 +0200 |
| commit | 45d986d11313ff2d8ed2cf6a34e2aefdc4639a99 (patch) | |
| tree | 2248b9a1b28fa288a3ec8260d9d63cbbb2ea08c5 /Documentation/filesystems | |
| parent | 4a39ac5b7d62679c07a3e3d12b0f6982377d8a7d (diff) | |
| parent | 6c4a5f96450415735c31ed70ff354f0ee5cbf67b (diff) | |
Merge tag 'ovl-update-6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs
Pull overlayfs updates from Amir Goldstein:
- Increase robustness of overlayfs to crashes in the case of underlying
filesystems that to not guarantee metadata ordering to persistent
storage (problem was reported with ubifs).
- Deny mount inside container with features that require root
privileges to work properly, instead of failing operations later.
- Some clarifications to overlayfs documentation.
* tag 'ovl-update-6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs:
ovl: fail if trusted xattrs are needed but caller lacks permission
overlayfs.rst: update metacopy section in overlayfs documentation
ovl: fsync after metadata copy-up
ovl: don't set the superblock's errseq_t manually
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/overlayfs.rst | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/Documentation/filesystems/overlayfs.rst b/Documentation/filesystems/overlayfs.rst index 165514401441..343644712340 100644 --- a/Documentation/filesystems/overlayfs.rst +++ b/Documentation/filesystems/overlayfs.rst @@ -367,8 +367,11 @@ Metadata only copy up When the "metacopy" feature is enabled, overlayfs will only copy up metadata (as opposed to whole file), when a metadata specific operation -like chown/chmod is performed. Full file will be copied up later when -file is opened for WRITE operation. +like chown/chmod is performed. An upper file in this state is marked with +"trusted.overlayfs.metacopy" xattr which indicates that the upper file +contains no data. The data will be copied up later when file is opened for +WRITE operation. After the lower file's data is copied up, +the "trusted.overlayfs.metacopy" xattr is removed from the upper file. In other words, this is delayed data copy up operation and data is copied up when there is a need to actually modify data. |