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ovl: update documentation of inodes index feature

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Document that inode index feature solves breaking hard links on
copy up.

Simplify Kconfig backward compatibility disclaimer.

Signed-off-by: Amir Goldstein <[email protected]>
Signed-off-by: Miklos Szeredi <[email protected]>
This commit is contained in:
Amir Goldstein 2018-01-10 23:15:21 +02:00 • committed by Miklos Szeredi
commit 60b866420b
2 changed files with 6 additions and 9 deletions
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6
Documentation/filesystems/overlayfs.txt
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@ -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.