diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2019-06-06 12:31:15 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-06-06 12:31:15 -0700 |
| commit | 5d6b501fe5421c5df662e2935f55f5e3d2b5e012 (patch) | |
| tree | b585152e88b791047ca679eacdd958b70674cf7b /Documentation | |
| parent | 211758573b01f4cd27308464573d112ef85e0e1a (diff) | |
| parent | 5d3211b651a012bc77410ebf097b7271a7ce5c95 (diff) | |
Merge tag 'ovl-fixes-5.2-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
Pull overlayfs fixes from Miklos Szeredi:
"Here's one fix for a class of bugs triggered by syzcaller, and one
that makes xfstests fail less"
* tag 'ovl-fixes-5.2-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs:
ovl: doc: add non-standard corner cases
ovl: detect overlapping layers
ovl: support the FS_IOC_FS[SG]ETXATTR ioctls
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/filesystems/overlayfs.txt | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/Documentation/filesystems/overlayfs.txt b/Documentation/filesystems/overlayfs.txt index eef7d9d259e8..1da2f1668f08 100644 --- a/Documentation/filesystems/overlayfs.txt +++ b/Documentation/filesystems/overlayfs.txt @@ -336,8 +336,20 @@ the copied layers will fail the verification of the lower root file handle. Non-standard behavior --------------------- -Overlayfs can now act as a POSIX compliant filesystem with the following -features turned on: +Current version of overlayfs can act as a mostly POSIX compliant +filesystem. + +This is the list of cases that overlayfs doesn't currently handle: + +a) POSIX mandates updating st_atime for reads. This is currently not +done in the case when the file resides on a lower layer. + +b) If a file residing on a lower layer is opened for read-only and then +memory mapped with MAP_SHARED, then subsequent changes to the file are not +reflected in the memory mapping. + +The following options allow overlayfs to act more like a standards +compliant filesystem: 1) "redirect_dir" |