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fs-verity: add the hook for file ->setattr()

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Add a function fsverity_prepare_setattr() which filesystems that support
fs-verity must call to deny truncates of verity files.

Reviewed-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
This commit is contained in:
Eric Biggers 2019-07-22 09:26:22 -07:00
parent fd2d1acfca
commit c1d9b584e2
2 changed files with 28 additions and 0 deletions
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7
include/linux/fsverity.h
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@ -46,6 +46,7 @@ static inline struct fsverity_info *fsverity_get_info(const struct inode *inode)
/* open.c */
extern int fsverity_file_open(struct inode *inode, struct file *filp);
extern int fsverity_prepare_setattr(struct dentry *dentry, struct iattr *attr);
extern void fsverity_cleanup_inode(struct inode *inode);
#else /* !CONFIG_FS_VERITY */
@ -62,6 +63,12 @@ static inline int fsverity_file_open(struct inode *inode, struct file *filp)
return IS_VERITY(inode) ? -EOPNOTSUPP : 0;
}
static inline int fsverity_prepare_setattr(struct dentry *dentry,
struct iattr *attr)
{
return IS_VERITY(d_inode(dentry)) ? -EOPNOTSUPP : 0;
}
static inline void fsverity_cleanup_inode(struct inode *inode)
{
}