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| author | Amir Goldstein <amir73il@gmail.com> | 2018-01-11 00:15:21 +0300 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2018-01-24 12:20:02 +0300 |
| commit | 60b866420ba7ae0b6a8d338f49be21c601d19064 (patch) | |
| tree | eacffe3aa31d206868938bc2d92149dcb738e125 | |
| parent | 051224438af21047b34160b1e0ad1c5af45fdace (diff) | |
| download | linux-60b866420ba7ae0b6a8d338f49be21c601d19064.tar.xz | |
ovl: update documentation of inodes index feature
Document that inode index feature solves breaking hard links on
copy up.
Simplify Kconfig backward compatibility disclaimer.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
| -rw-r--r-- | Documentation/filesystems/overlayfs.txt | 6 | ||||
| -rw-r--r-- | fs/overlayfs/Kconfig | 9 |
2 files changed, 6 insertions, 9 deletions
diff --git a/Documentation/filesystems/overlayfs.txt b/Documentation/filesystems/overlayfs.txt index e6a5f4912b6d..213547cb6d36 100644 --- a/Documentation/filesystems/overlayfs.txt +++ b/Documentation/filesystems/overlayfs.txt @@ -281,9 +281,9 @@ filesystem, so both st_dev and st_ino of the file may change. Any open files referring to this inode will access the old data. -If a file with multiple hard links is copied up, then this will -"break" the link. Changes will not be propagated to other names -referring to the same inode. +Unless "inode index" feature is enabled, if a file with multiple hard +links is copied up, then this will "break" the link. Changes will not be +propagated to other names referring to the same inode. Unless "redirect_dir" feature is enabled, rename(2) on a lower or merged directory will fail with EXDEV. diff --git a/fs/overlayfs/Kconfig b/fs/overlayfs/Kconfig index 5ac415466861..9eac01c3e21e 100644 --- a/fs/overlayfs/Kconfig +++ b/fs/overlayfs/Kconfig @@ -47,9 +47,6 @@ config OVERLAY_FS_INDEX The inodes index feature prevents breaking of lower hardlinks on copy up. - Note, that the inodes index feature is read-only backward compatible. - That is, mounting an overlay which has an index dir on a kernel that - doesn't support this feature read-only, will not have any negative - outcomes. However, mounting the same overlay with an old kernel - read-write and then mounting it again with a new kernel, will have - unexpected results. + Note, that the inodes index feature is not backward compatible. + That is, mounting an overlay which has an inodes index on a kernel + that doesn't support this feature will have unexpected results. |