MFC r275481:

Add to CTL support for threshold notifications for file-backed LUNs.

Previously it was supported only for ZVOL-backed LUNs, but now should work
for file-backed LUNs too.  Used value in this case is a space occupied by
the backing file, while available value is an available space on file
system.  Pool thresholds are still not implemented in this case.

Sponsored by:   iXsystems, Inc.

1 files changed, 28 insertions, 0 deletions

diff --git a/sys/cam/ctl/ctl_backend_block.c b/sys/cam/ctl/ctl_backend_block.c
index 3e33084..8f7c5d4 100644
--- a/sys/cam/ctl/ctl_backend_block.c
+++ b/sys/cam/ctl/ctl_backend_block.c
@@ -245,6 +245,8 @@ static void ctl_be_block_dispatch_file(struct ctl_be_block_lun *be_lun,
 				       struct ctl_be_block_io *beio);
 static void ctl_be_block_gls_file(struct ctl_be_block_lun *be_lun,
 				  struct ctl_be_block_io *beio);
+static uint64_t ctl_be_block_getattr_file(struct ctl_be_block_lun *be_lun,
+					 const char *attrname);
 static void ctl_be_block_flush_dev(struct ctl_be_block_lun *be_lun,
 				   struct ctl_be_block_io *beio);
 static void ctl_be_block_unmap_dev(struct ctl_be_block_lun *be_lun,
@@ -802,6 +804,31 @@ ctl_be_block_gls_file(struct ctl_be_block_lun *be_lun,
 	ctl_complete_beio(beio);
 }
 
+static uint64_t
+ctl_be_block_getattr_file(struct ctl_be_block_lun *be_lun, const char *attrname)
+{
+	struct vattr		vattr;
+	struct statfs		statfs;
+	int			error;
+
+	if (be_lun->vn == NULL)
+		return (UINT64_MAX);
+	if (strcmp(attrname, "blocksused") == 0) {
+		error = VOP_GETATTR(be_lun->vn, &vattr, curthread->td_ucred);
+		if (error != 0)
+			return (UINT64_MAX);
+		return (vattr.va_bytes >> be_lun->blocksize_shift);
+	}
+	if (strcmp(attrname, "blocksavail") == 0) {
+		error = VFS_STATFS(be_lun->vn->v_mount, &statfs);
+		if (error != 0)
+			return (UINT64_MAX);
+		return ((statfs.f_bavail * statfs.f_bsize) >>
+		    be_lun->blocksize_shift);
+	}
+	return (UINT64_MAX);
+}
+
 static void
 ctl_be_block_dispatch_zvol(struct ctl_be_block_lun *be_lun,
 			   struct ctl_be_block_io *beio)
@@ -1727,6 +1754,7 @@ ctl_be_block_open_file(struct ctl_be_block_lun *be_lun, struct ctl_lun_req *req)
 	be_lun->dispatch = ctl_be_block_dispatch_file;
 	be_lun->lun_flush = ctl_be_block_flush_file;
 	be_lun->get_lba_status = ctl_be_block_gls_file;
+	be_lun->getattr = ctl_be_block_getattr_file;
 
 	error = VOP_GETATTR(be_lun->vn, &vattr, curthread->td_ucred);
 	if (error != 0) {