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xattr: Add __vfs_{get,set,remove}xattr helpers

Browse source 
Right now, various places in the kernel check for the existence of
getxattr, setxattr, and removexattr inode operations and directly call
those operations.  Switch to helper functions and test for the IOP_XATTR
flag instead.

Signed-off-by: Andreas Gruenbacher <[email protected]>
Acked-by: James Morris <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Andreas Gruenbacher 2016-09-29 17:48:42 +02:00 • committed by Al Viro
commit 5d6c31910b
14 changed files with 97 additions and 85 deletions
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46
fs/xattr.c
View file

@ -136,6 +136,16 @@ xattr_permission(struct inode *inode, const char *name, int mask)
return inode_permission(inode, mask);
}
int
__vfs_setxattr(struct dentry *dentry, struct inode *inode, const char *name,
const void *value, size_t size, int flags)
{
if (!inode->i_op->setxattr)
return -EOPNOTSUPP;
return inode->i_op->setxattr(dentry, inode, name, value, size, flags);
}
EXPORT_SYMBOL(__vfs_setxattr);
/**
* __vfs_setxattr_noperm - perform setxattr operation without performing
* permission checks.
@ -163,7 +173,7 @@ int __vfs_setxattr_noperm(struct dentry *dentry, const char *name,
if (issec)
inode->i_flags &= ~S_NOSEC;
if (inode->i_op->setxattr) {
error = inode->i_op->setxattr(dentry, inode, name, value, size, flags);
error = __vfs_setxattr(dentry, inode, name, value, size, flags);
if (!error) {
fsnotify_xattr(dentry);
security_inode_post_setxattr(dentry, name, value,
@ -274,6 +284,16 @@ vfs_getxattr_alloc(struct dentry *dentry, const char *name, char **xattr_value,
return error;
}
ssize_t
__vfs_getxattr(struct dentry *dentry, struct inode *inode, const char *name,
void *value, size_t size)
{
if (!inode->i_op->getxattr)
return -EOPNOTSUPP;
return inode->i_op->getxattr(dentry, inode, name, value, size);
}
EXPORT_SYMBOL(__vfs_getxattr);
ssize_t
vfs_getxattr(struct dentry *dentry, const char *name, void *value, size_t size)
{
@ -301,13 +321,7 @@ vfs_getxattr(struct dentry *dentry, const char *name, void *value, size_t size)
return ret;
}
nolsm:
if (inode->i_op->getxattr)
error = inode->i_op->getxattr(dentry, inode, name, value, size);
else
error = -EOPNOTSUPP;
return error;
return __vfs_getxattr(dentry, inode, name, value, size);
}
EXPORT_SYMBOL_GPL(vfs_getxattr);
@ -331,15 +345,23 @@ vfs_listxattr(struct dentry *d, char *list, size_t size)
}
EXPORT_SYMBOL_GPL(vfs_listxattr);
int
__vfs_removexattr(struct dentry *dentry, const char *name)
{
struct inode *inode = dentry->d_inode;
if (!inode->i_op->removexattr)
return -EOPNOTSUPP;
return inode->i_op->removexattr(dentry, name);
}
EXPORT_SYMBOL(__vfs_removexattr);
int
vfs_removexattr(struct dentry *dentry, const char *name)
{
struct inode *inode = dentry->d_inode;
int error;
if (!inode->i_op->removexattr)
return -EOPNOTSUPP;
error = xattr_permission(inode, name, MAY_WRITE);
if (error)
return error;
@ -349,7 +371,7 @@ vfs_removexattr(struct dentry *dentry, const char *name)
if (error)
goto out;
error = inode->i_op->removexattr(dentry, name);
error = __vfs_removexattr(dentry, name);
if (!error) {
fsnotify_xattr(dentry);