Differential D21287 Diff 61388 head/sys/fs/fuse/fuse_vnops.c

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head/sys/fs/fuse/fuse_vnops.c

Show First 20 Lines • Show All 2,219 Lines • ▼ Show 20 Lines	while (pos < list_len && list[pos] != '\0') {

pos += dist_to_next;		pos += dist_to_next;
}		}

return (0);		return (0);
}		}

/*		/*
		* List extended attributes
		*
		* The FUSE_LISTXATTR operation is based on Linux's listxattr(2) syscall, which
		* has a number of differences compared to its FreeBSD equivalent,
		* extattr_list_file:
		*
		* - FUSE_LISTXATTR returns all extended attributes across all namespaces,
		* whereas listxattr(2) only returns attributes for a single namespace
		* - FUSE_LISTXATTR prepends each attribute name with "namespace."
		* - If the provided buffer is not large enough to hold the result,
		* FUSE_LISTXATTR should return ERANGE, whereas listxattr is expected to
		* return as many results as will fit.
		*/
		/*
struct vop_listextattr_args {		struct vop_listextattr_args {
struct vop_generic_args a_gen;		struct vop_generic_args a_gen;
struct vnode *a_vp;		struct vnode *a_vp;
int a_attrnamespace;		int a_attrnamespace;
struct uio *a_uio;		struct uio *a_uio;
size_t *a_size;		size_t *a_size;
struct ucred *a_cred;		struct ucred *a_cred;
struct thread *a_td;		struct thread *a_td;
▲ Show 20 Lines • Show All 62 Lines • ▼ Show 20 Lines	if (linux_list_len == 0) {
goto out;		goto out;
}		}

/*		/*
* Retrieve Linux / FUSE compatible list values.		* Retrieve Linux / FUSE compatible list values.
*/		*/
fdisp_refresh_vp(&fdi, FUSE_LISTXATTR, vp, td, cred);		fdisp_refresh_vp(&fdi, FUSE_LISTXATTR, vp, td, cred);
list_xattr_in = fdi.indata;		list_xattr_in = fdi.indata;
list_xattr_in->size = linux_list_len + sizeof(*list_xattr_out);		list_xattr_in->size = linux_list_len;

err = fdisp_wait_answ(&fdi);		err = fdisp_wait_answ(&fdi);
if (err != 0)		if (err == ERANGE) {
		/*
		* Race detected. The attribute list must've grown since the
		* first FUSE_LISTXATTR call. Start over. Go all the way back
		* to userland so we can process signals, if necessary, before
		* restarting.
		*/
		err = ERESTART;
goto out;		goto out;
		} else if (err != 0)
		goto out;

linux_list = fdi.answ;		linux_list = fdi.answ;
		/* FUSE doesn't allow the server to return more data than requested */
		if (fdi.iosize > linux_list_len) {
		printf("WARNING: FUSE protocol violation. Server returned "
		"more extended attribute data than requested; "
		"should've returned ERANGE instead");
		} else {
		/* But returning less data is fine */
linux_list_len = fdi.iosize;		linux_list_len = fdi.iosize;
		}

/*		/*
* Retrieve the BSD compatible list values.		* Retrieve the BSD compatible list values.
* The Linux / FUSE attribute list format isn't the same		* The Linux / FUSE attribute list format isn't the same
* as FreeBSD's format. So we need to transform it into		* as FreeBSD's format. So we need to transform it into
* FreeBSD's format before giving it to the user.		* FreeBSD's format before giving it to the user.
*/		*/
bsd_list = malloc(linux_list_len, M_TEMP, M_WAITOK);		bsd_list = malloc(linux_list_len, M_TEMP, M_WAITOK);
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