ovl: store real inode pointer in ->i_private

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To get from overlay inode to real inode we currently use 'struct
ovl_entry', which has lifetime connected to overlay dentry.  This is okay,
since each overlay dentry had a new overlay inode allocated.

Following patch will break that assumption, so need to leave out ovl_entry.
This patch stores the real inode directly in i_private, with the lowest bit
used to indicate whether the inode is upper or lower.

Lifetime rules remain, using ovl_inode_real() must only be done while
caller holds ref on overlay dentry (and hence on real dentry), or within
RCU protected regions.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

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This commit is contained in:

Miklos Szeredi 2016-07-29 12:05:24 +02:00

parent a999d7e161

commit 39b681f802

5 changed files with 40 additions and 37 deletions

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1

fs/overlayfs/copy_up.c

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3

fs/overlayfs/dir.c

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11

fs/overlayfs/inode.c

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18

fs/overlayfs/overlayfs.h

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44

fs/overlayfs/super.c

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