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| author | Amir Goldstein <amir73il@gmail.com> | 2017-04-25 17:28:31 +0300 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2017-05-05 12:38:59 +0300 |
| commit | 65f2673832d4647f6d46783d8d745d2b15d090c4 (patch) | |
| tree | 858adbc941fbe715299aba8dc928e517bbad541e /Documentation/filesystems/overlayfs.txt | |
| parent | 5b6c9053fb38a66fd5c6177fcf5022b24767811a (diff) | |
| download | linux-65f2673832d4647f6d46783d8d745d2b15d090c4.tar.xz | |
ovl: update documentation w.r.t. constant inode numbers
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'Documentation/filesystems/overlayfs.txt')
| -rw-r--r-- | Documentation/filesystems/overlayfs.txt | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/Documentation/filesystems/overlayfs.txt b/Documentation/filesystems/overlayfs.txt index 634d03e20c2d..c9e884b52698 100644 --- a/Documentation/filesystems/overlayfs.txt +++ b/Documentation/filesystems/overlayfs.txt @@ -21,12 +21,19 @@ from accessing the corresponding object from the original filesystem. This is most obvious from the 'st_dev' field returned by stat(2). While directories will report an st_dev from the overlay-filesystem, -all non-directory objects will report an st_dev from the lower or +non-directory objects may report an st_dev from the lower filesystem or upper filesystem that is providing the object. Similarly st_ino will only be unique when combined with st_dev, and both of these can change over the lifetime of a non-directory object. Many applications and tools ignore these values and will not be affected. +In the special case of all overlay layers on the same underlying +filesystem, all objects will report an st_dev from the overlay +filesystem and st_ino from the underlying filesystem. This will +make the overlay mount more compliant with filesystem scanners and +overlay objects will be distinguishable from the corresponding +objects in the original filesystem. + Upper and Lower --------------- |