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authorAndreas Gruenbacher <agruenba@redhat.com>2016-09-29 18:48:42 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2016-10-08 03:10:44 +0300
commit5d6c31910bc0713e37628dc0ce677dcb13c8ccf4 (patch)
treea28f96e71f09da2fbbde50882d56e5d5657c0ede /fs/xattr.c
parentf5c244383725a6de06bc62fa7c54c0ea0d942eec (diff)
downloadlinux-5d6c31910bc0713e37628dc0ce677dcb13c8ccf4.tar.xz
xattr: Add __vfs_{get,set,remove}xattr helpers
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 <agruenba@redhat.com> Acked-by: James Morris <james.l.morris@oracle.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/xattr.c')
-rw-r--r--fs/xattr.c44
1 files changed, 33 insertions, 11 deletions
diff --git a/fs/xattr.c b/fs/xattr.c
index 1f5d0b48422a..54a411519127 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -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,
@@ -275,6 +285,16 @@ vfs_getxattr_alloc(struct dentry *dentry, const char *name, char **xattr_value,
}
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)
{
struct inode *inode = dentry->d_inode;
@@ -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);
@@ -332,13 +346,21 @@ vfs_listxattr(struct dentry *d, char *list, size_t size)
EXPORT_SYMBOL_GPL(vfs_listxattr);
int
-vfs_removexattr(struct dentry *dentry, const char *name)
+__vfs_removexattr(struct dentry *dentry, const char *name)
{
struct inode *inode = dentry->d_inode;
- int error;
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;
error = xattr_permission(inode, name, MAY_WRITE);
if (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);