From 48c40e1a42efe1b59126406084821947d139dd0e Mon Sep 17 00:00:00 2001 From: "M. Mohan Kumar" Date: Wed, 13 Nov 2013 22:44:42 +0530 Subject: bd: posix/multi-brick support to BD xlator Current BD xlator (block backend) has a few limitations such as * Creation of directories not supported * Supports only single brick * Does not use extended attributes (and client gfid) like posix xlator * Creation of special files (symbolic links, device nodes etc) not supported Basic limitation of not allowing directory creation is blocking oVirt/VDSM to consume BD xlator as part of Gluster domain since VDSM creates multi-level directories when GlusterFS is used as storage backend for storing VM images. To overcome these limitations a new BD xlator with following improvements is suggested. * New hybrid BD xlator that handles both regular files and block device files * The volume will have both POSIX and BD bricks. Regular files are created on POSIX bricks, block devices are created on the BD brick (VG) * BD xlator leverages exiting POSIX xlator for most POSIX calls and hence sits above the POSIX xlator * Block device file is differentiated from regular file by an extended attribute * The xattr 'user.glusterfs.bd' (BD_XATTR) plays a role in mapping a posix file to Logical Volume (LV). * When a client sends a request to set BD_XATTR on a posix file, a new LV is created and mapped to posix file. So every block device will have a representative file in POSIX brick with 'user.glusterfs.bd' (BD_XATTR) set. * Here after all operations on this file results in LV related operations. For example opening a file that has BD_XATTR set results in opening the LV block device, reading results in reading the corresponding LV block device. When BD xlator gets request to set BD_XATTR via setxattr call, it creates a LV and information about this LV is placed in the xattr of the posix file. xattr "user.glusterfs.bd" used to identify that posix file is mapped to BD. Usage: Server side: [root@host1 ~]# gluster volume create bdvol host1:/storage/vg1_info?vg1 host2:/storage/vg2_info?vg2 It creates a distributed gluster volume 'bdvol' with Volume Group vg1 using posix brick /storage/vg1_info in host1 and Volume Group vg2 using /storage/vg2_info in host2. [root@host1 ~]# gluster volume start bdvol Client side: [root@node ~]# mount -t glusterfs host1:/bdvol /media [root@node ~]# touch /media/posix It creates regular posix file 'posix' in either host1:/vg1 or host2:/vg2 brick [root@node ~]# mkdir /media/image [root@node ~]# touch /media/image/lv1 It also creates regular posix file 'lv1' in either host1:/vg1 or host2:/vg2 brick [root@node ~]# setfattr -n "user.glusterfs.bd" -v "lv" /media/image/lv1 [root@node ~]# Above setxattr results in creating a new LV in corresponding brick's VG and it sets 'user.glusterfs.bd' with value 'lv: --deltag > Changes from previous version V5: * Removed support for delayed deleting of LVs Changes from previous version V4: * Consolidated the patches * Removed usage of BD_XATTR_SIZE and consolidated it in BD_XATTR. Changes from previous version V3: * Added support in FUSE to support full/linked clone * Added support to merge snapshots and provide information about origin * bd_map xlator removed * iatt structure used in inode_ctx. iatt is cached and updated during fsync/flush * aio support * Type and capabilities of volume are exported through getxattr Changes from version 2: * Used inode_context for caching BD size and to check if loc/fd is BD or not. * Added GlusterFS server offloaded copy and snapshot through setfattr FOP. As part of this libgfapi is modified. * BD xlator supports stripe * During unlinking if a LV file is already opened, its added to delete list and bd_del_thread tries to delete from this list when a last reference to that file is closed. Changes from previous version: * gfid is used as name of LV * ? is used to specify VG name for creating BD volume in volume create, add-brick. gluster volume create volname host:/path?vg * open-behind issue is fixed * A replicate brick can be added dynamically and LVs from source brick are replicated to destination brick * A distribute brick can be added dynamically and rebalance operation distributes existing LVs/files to the new brick * Thin provisioning support added. * bd_map xlator support retained * setfattr -n user.glusterfs.bd -v "lv" creates a regular LV and setfattr -n user.glusterfs.bd -v "thin" creates thin LV * Capability and backend information added to gluster volume info (and --xml) so that management tools can exploit BD xlator. * tracing support for bd xlator added TODO: * Add support to display snapshots for a given LV * Display posix filename for list-origin instead of gfid Change-Id: I00d32dfbab3b7c806e0841515c86c3aa519332f2 BUG: 1028672 Signed-off-by: M. Mohan Kumar Reviewed-on: http://review.gluster.org/4809 Tested-by: Gluster Build System Reviewed-by: Anand Avati --- xlators/storage/bd/Makefile.am | 3 +++ 1 file changed, 3 insertions(+) create mode 100644 xlators/storage/bd/Makefile.am (limited to 'xlators/storage/bd/Makefile.am') diff --git a/xlators/storage/bd/Makefile.am b/xlators/storage/bd/Makefile.am new file mode 100644 index 00000000000..a985f42a877 --- /dev/null +++ b/xlators/storage/bd/Makefile.am @@ -0,0 +1,3 @@ +SUBDIRS = src + +CLEANFILES = -- cgit