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UPSTREAM: new helper: inode_wrong_type()

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commit 6e3e2c4362e41a2f18e3f7a5ad81bd2f49a47b85 upstream.

inode_wrong_type(inode, mode) returns true if setting inode->i_mode
to given value would've changed the inode type.  We have enough of
those checks open-coded to make a helper worthwhile.

Change-Id: I346cb7a2d1cec2ca16096962d8adc9d7f848fc94
Signed-off-by: Al Viro <[email protected]>
Signed-off-by: Amir Goldstein <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Al Viro 2021-03-01 20:37:10 -05:00 • committed by Alexander Martinz
commit 831d8c1175
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10 changed files with 22 additions and 18 deletions
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4
fs/overlayfs/namei.c
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@ -345,7 +345,7 @@ int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected,
return PTR_ERR(origin);
if (upperdentry && !ovl_is_whiteout(upperdentry) &&
((d_inode(origin)->i_mode ^ d_inode(upperdentry)->i_mode) & S_IFMT))
inode_wrong_type(d_inode(upperdentry), d_inode(origin)->i_mode))
goto invalid;
if (!*stackp)
@ -717,7 +717,7 @@ struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper,
index = ERR_PTR(-ESTALE);
goto out;
} else if (ovl_dentry_weird(index) || ovl_is_whiteout(index) ||
((inode->i_mode ^ d_inode(origin)->i_mode) & S_IFMT)) {
inode_wrong_type(inode, d_inode(origin)->i_mode)) {
/*
* Index should always be of the same file type as origin
* except for the case of a whiteout index. A whiteout