xiaomi-sm8450/android_kernel_xiaomi_sm8450
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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>
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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3
fs/overlayfs/dir.c
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@@ -167,6 +167,7 @@ static void ovl_instantiate(struct dentry *dentry, struct inode *inode,
{
ovl_dentry_version_inc(dentry->d_parent);
ovl_dentry_update(dentry, newdentry);
ovl_inode_update(inode, d_inode(newdentry));
ovl_copyattr(newdentry->d_inode, inode);
d_instantiate(dentry, inode);
}
@@ -416,7 +417,7 @@ static int ovl_create_or_link(struct dentry *dentry, int mode, dev_t rdev,
};
err = -ENOMEM;
inode = ovl_new_inode(dentry->d_sb, mode, dentry->d_fsdata);
inode = ovl_new_inode(dentry->d_sb, mode);
if (!inode)
goto out;