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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.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Al Viro
2021-03-01 20:37:10 -05:00
committed by Greg Kroah-Hartman
parent ded9137fcf
commit 40ba433a85
10 changed files with 22 additions and 18 deletions
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5
include/linux/fs.h
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@@ -2768,6 +2768,11 @@ static inline bool execute_ok(struct inode *inode)
return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
}
static inline bool inode_wrong_type(const struct inode *inode, umode_t mode)
{
return (inode->i_mode ^ mode) & S_IFMT;
}
static inline void file_start_write(struct file *file)
{
if (!S_ISREG(file_inode(file)->i_mode))