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Date: Wed, 11 Nov 2015 02:16:33 +0100 From: Andreas Gruenbacher <agruenba@...hat.com> To: Alexander Viro <viro@...iv.linux.org.uk>, "Theodore Ts'o" <tytso@....edu>, Andreas Dilger <adilger.kernel@...ger.ca>, "J. Bruce Fields" <bfields@...ldses.org>, Jeff Layton <jlayton@...chiereds.net>, Trond Myklebust <trond.myklebust@...marydata.com>, Anna Schumaker <anna.schumaker@...app.com>, Dave Chinner <david@...morbit.com>, linux-ext4 <linux-ext4@...r.kernel.org>, XFS Developers <xfs@....sgi.com>, LKML <linux-kernel@...r.kernel.org>, linux-fsdevel <linux-fsdevel@...r.kernel.org>, Linux NFS Mailing List <linux-nfs@...r.kernel.org>, linux-cifs@...r.kernel.org, Linux API <linux-api@...r.kernel.org> Cc: Andreas Gruenbacher <agruenba@...hat.com> Subject: Re: [PATCH v15 19/22] richacl: Add richacl xattr handler On Mon, Nov 9, 2015 at 12:09 PM, Andreas Gruenbacher <agruenba@...hat.com> wrote: > Add richacl xattr handler implementing the xattr operations based on the > get_richacl and set_richacl inode operations. > > Signed-off-by: Andreas Gruenbacher <agruenba@...hat.com> > --- > fs/richacl_xattr.c | 78 +++++++++++++++++++++++++++++++++++++++++++ > include/linux/richacl_xattr.h | 2 ++ > 2 files changed, 80 insertions(+) > > diff --git a/fs/richacl_xattr.c b/fs/richacl_xattr.c > index 38473b6..767c1f7 100644 > --- a/fs/richacl_xattr.c > +++ b/fs/richacl_xattr.c > @@ -18,7 +18,9 @@ > #include <linux/fs.h> > #include <linux/slab.h> > #include <linux/module.h> > +#include <linux/xattr.h> > #include <linux/richacl_xattr.h> > +#include <uapi/linux/xattr.h> > > MODULE_LICENSE("GPL"); > > @@ -161,6 +163,82 @@ richacl_to_xattr(struct user_namespace *user_ns, > } > EXPORT_SYMBOL_GPL(richacl_to_xattr); > > +static size_t > +richacl_xattr_list(struct dentry *dentry, char *list, size_t list_len, > + const char *name, size_t name_len, int handler_flags) > +{ > + const size_t size = sizeof(XATTR_NAME_RICHACL); > + > + if (!IS_RICHACL(d_backing_inode(dentry))) > + return 0; > + if (list && size <= list_len) > + memcpy(list, XATTR_NAME_RICHACL, size); > + return size; > +} > + > +static int > +richacl_xattr_get(struct dentry *dentry, const char *name, void *buffer, > + size_t buffer_size, int handler_flags) > +{ > + struct inode *inode = d_backing_inode(dentry); > + struct richacl *acl; > + int error; > + > + if (strcmp(name, "") != 0) > + return -EINVAL; > + if (!IS_RICHACL(inode)) > + return EOPNOTSUPP; This should have been -EOPNOTSUPP instead. > + if (S_ISLNK(inode->i_mode)) > + return -EOPNOTSUPP; > + acl = get_richacl(inode); > + if (IS_ERR(acl)) > + return PTR_ERR(acl); > + if (acl == NULL) > + return -ENODATA; > + error = richacl_to_xattr(&init_user_ns, acl, buffer, buffer_size); > + richacl_put(acl); > + return error; > +} > + > +static int > +richacl_xattr_set(struct dentry *dentry, const char *name, > + const void *value, size_t size, int flags, int handler_flags) > +{ > + struct inode *inode = d_backing_inode(dentry); > + struct richacl *acl = NULL; > + int ret; > + > + if (strcmp(name, "") != 0) > + return -EINVAL; > + if (!IS_RICHACL(inode)) > + return -EOPNOTSUPP; > + if (!inode->i_op->set_richacl) > + return -EOPNOTSUPP; > + > + if (!uid_eq(current_fsuid(), inode->i_uid) && > + inode_permission(inode, MAY_CHMOD) && > + !capable(CAP_FOWNER)) > + return -EPERM; > + > + if (value) { > + acl = richacl_from_xattr(&init_user_ns, value, size); > + if (IS_ERR(acl)) > + return PTR_ERR(acl); > + } > + > + ret = inode->i_op->set_richacl(inode, acl); > + richacl_put(acl); > + return ret; > +} > + > +struct xattr_handler richacl_xattr_handler = { > + .prefix = XATTR_NAME_RICHACL, > + .list = richacl_xattr_list, > + .get = richacl_xattr_get, > + .set = richacl_xattr_set, > +}; > +EXPORT_SYMBOL(richacl_xattr_handler); > + > /* > * Fix up the uids and gids in richacl extended attributes in place. > */ > diff --git a/include/linux/richacl_xattr.h b/include/linux/richacl_xattr.h > index 7fc5ca8..45ec27a 100644 > --- a/include/linux/richacl_xattr.h > +++ b/include/linux/richacl_xattr.h > @@ -39,4 +39,6 @@ static inline void richacl_fix_xattr_to_user(void *value, size_t size) > } > #endif > > +extern struct xattr_handler richacl_xattr_handler; > + > #endif /* __RICHACL_XATTR_H */ > -- > 2.5.0 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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