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sanitize xattr handler prototypes

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Add a flags argument to struct xattr_handler and pass it to all xattr
handler methods.  This allows using the same methods for multiple
handlers, e.g. for the ACL methods which perform exactly the same action
for the access and default ACLs, just using a different underlying
attribute.  With a little more groundwork it'll also allow sharing the
methods for the regular user/trusted/secure handlers in extN, ocfs2 and
jffs2 like it's already done for xfs in this patch.

Also change the inode argument to the handlers to a dentry to allow
using the handlers mechnism for filesystems that require it later,
e.g. cifs.

[with GFS2 bits updated by Steven Whitehouse <[email protected]>]

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: James Morris <[email protected]>
Acked-by: Joel Becker <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Christoph Hellwig 2009-11-13 09:52:56 +00:00 • committed by Al Viro
commit 431547b3c4
39 changed files with 533 additions and 815 deletions
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28
fs/xattr.c
View file

@ -615,12 +615,11 @@ ssize_t
generic_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t size)
{
struct xattr_handler *handler;
struct inode *inode = dentry->d_inode;
handler = xattr_resolve_name(inode->i_sb->s_xattr, &name);
handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name);
if (!handler)
return -EOPNOTSUPP;
return handler->get(inode, name, buffer, size);
return handler->get(dentry, name, buffer, size, handler->flags);
}
/*
@ -630,18 +629,20 @@ generic_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t s
ssize_t
generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
{
struct inode *inode = dentry->d_inode;
struct xattr_handler *handler, **handlers = inode->i_sb->s_xattr;
struct xattr_handler *handler, **handlers = dentry->d_sb->s_xattr;
unsigned int size = 0;
if (!buffer) {
for_each_xattr_handler(handlers, handler)
size += handler->list(inode, NULL, 0, NULL, 0);
for_each_xattr_handler(handlers, handler) {
size += handler->list(dentry, NULL, 0, NULL, 0,
handler->flags);
}
} else {
char *buf = buffer;
for_each_xattr_handler(handlers, handler) {
size = handler->list(inode, buf, buffer_size, NULL, 0);
size = handler->list(dentry, buf, buffer_size,
NULL, 0, handler->flags);
if (size > buffer_size)
return -ERANGE;
buf += size;
@ -659,14 +660,13 @@ int
generic_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags)
{
struct xattr_handler *handler;
struct inode *inode = dentry->d_inode;
if (size == 0)
value = ""; /* empty EA, do not remove */
handler = xattr_resolve_name(inode->i_sb->s_xattr, &name);
handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name);
if (!handler)
return -EOPNOTSUPP;
return handler->set(inode, name, value, size, flags);
return handler->set(dentry, name, value, size, 0, handler->flags);
}
/*
@ -677,12 +677,12 @@ int
generic_removexattr(struct dentry *dentry, const char *name)
{
struct xattr_handler *handler;
struct inode *inode = dentry->d_inode;
handler = xattr_resolve_name(inode->i_sb->s_xattr, &name);
handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name);
if (!handler)
return -EOPNOTSUPP;
return handler->set(inode, name, NULL, 0, XATTR_REPLACE);
return handler->set(dentry, name, NULL, 0,
XATTR_REPLACE, handler->flags);
}
EXPORT_SYMBOL(generic_getxattr);