ovl: lookup indexed ancestor of lower dir

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ovl_lookup_real() in lower layer walks back lower parents to find the
topmost indexed parent. If an indexed ancestor is found before reaching
lower layer root, ovl_lookup_real() is called recursively with upper
layer to walk back from indexed upper to the topmost connected/hashed
upper parent (or up to root).

ovl_lookup_real() in upper layer then walks forward to connect the topmost
upper overlay dir dentry and ovl_lookup_real() in lower layer continues to
walk forward to connect the decoded lower overlay dir dentry.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

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Amir Goldstein 2018-01-17 14:40:27 +02:00 • committed by Miklos Szeredi

parent 4b91c30a5a

commit 0617015403

3 changed files with 56 additions and 7 deletions

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41

fs/overlayfs/export.c

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20

fs/overlayfs/namei.c

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2

fs/overlayfs/overlayfs.h

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