From 81a57679c20ac0ac9b48e313af75036132e3a5ad Mon Sep 17 00:00:00 2001 From: "M. Mohan Kumar" Date: Wed, 13 Nov 2013 22:44:43 +0530 Subject: bd: Add support to create clone, snapshot and merge of LV images. Special xattr names "clone" & "snapshot" can be used to create full and linked clone of the LV images. GFID of destination posix file (to be mapped) is passed as a value to the xattr. Destination posix file must exist before running this operation. These operations form a basis for offloading storage related operations from QEMU to GlusterFS. Syntax for full clone: xattr name: "clone" value: "gfid-of-dest-file" Syntax for linked clone: xattr name: "snapshot" value: "gfid-of-dest-file" Syntax for merging: xattr name: "merge" value: "path-to-snapshot-file" Example: setfattr -n clone -v /media/source setfattr -n snapshot -v /media/source setfattr -n merge -v "/media/sn" /media/sn Change-Id: Id9f984a709d4c2e52a64ae75bb12a8ecb01f8776 BUG: 1028672 Signed-off-by: M. Mohan Kumar Reviewed-on: http://review.gluster.org/5626 Tested-by: Gluster Build System Reviewed-by: Anand Avati --- xlators/mgmt/glusterd/src/glusterd-brick-ops.c | 3 +- xlators/mgmt/glusterd/src/glusterd-handler.c | 39 +++++++++++++++++++++++-- xlators/mgmt/glusterd/src/glusterd-volume-ops.c | 9 +++--- xlators/mgmt/glusterd/src/glusterd.h | 6 ++-- 4 files changed, 47 insertions(+), 10 deletions(-) (limited to 'xlators/mgmt/glusterd/src') diff --git a/xlators/mgmt/glusterd/src/glusterd-brick-ops.c b/xlators/mgmt/glusterd/src/glusterd-brick-ops.c index cc425353516..df6087659ef 100644 --- a/xlators/mgmt/glusterd/src/glusterd-brick-ops.c +++ b/xlators/mgmt/glusterd/src/glusterd-brick-ops.c @@ -1109,7 +1109,8 @@ glusterd_op_perform_add_bricks (glusterd_volinfo_t *volinfo, int32_t count, brick = strtok_r (brick_list+1, " \n", &saveptr); #ifdef HAVE_BD_XLATOR if (brickinfo->vg[0]) - caps = CAPS_BD | CAPS_THIN; + caps = CAPS_BD | CAPS_THIN | + CAPS_OFFLOAD_COPY | CAPS_OFFLOAD_SNAPSHOT; #endif while (i <= count) { diff --git a/xlators/mgmt/glusterd/src/glusterd-handler.c b/xlators/mgmt/glusterd/src/glusterd-handler.c index 181b8fcf1a9..fcffccc07b8 100644 --- a/xlators/mgmt/glusterd/src/glusterd-handler.c +++ b/xlators/mgmt/glusterd/src/glusterd-handler.c @@ -335,7 +335,7 @@ glusterd_add_volume_detail_to_dict (glusterd_volinfo_t *volinfo, char *volume_id_str = NULL; struct args_pack pack = {0,}; xlator_t *this = NULL; - + int caps = 0; GF_ASSERT (volinfo); GF_ASSERT (volumes); @@ -401,6 +401,7 @@ glusterd_add_volume_detail_to_dict (glusterd_volinfo_t *volinfo, #ifdef HAVE_BD_XLATOR if (volinfo->caps) { + caps = 0; snprintf (key, 256, "volume%d.xlator0", count); buf = GF_MALLOC (256, gf_common_mt_char); if (!buf) { @@ -416,7 +417,8 @@ glusterd_add_volume_detail_to_dict (glusterd_volinfo_t *volinfo, } if (volinfo->caps & CAPS_THIN) { - snprintf (key, 256, "volume%d.xlator0.caps0", count); + snprintf (key, 256, "volume%d.xlator0.caps%d", count, + caps++); buf = GF_MALLOC (256, gf_common_mt_char); if (!buf) { ret = ENOMEM; @@ -429,6 +431,39 @@ glusterd_add_volume_detail_to_dict (glusterd_volinfo_t *volinfo, goto out; } } + + if (volinfo->caps & CAPS_OFFLOAD_COPY) { + snprintf (key, 256, "volume%d.xlator0.caps%d", count, + caps++); + buf = GF_MALLOC (256, gf_common_mt_char); + if (!buf) { + ret = ENOMEM; + goto out; + } + snprintf (buf, 256, "offload_copy"); + ret = dict_set_dynstr (volumes, key, buf); + if (ret) { + GF_FREE (buf); + goto out; + } + } + + if (volinfo->caps & CAPS_OFFLOAD_SNAPSHOT) { + snprintf (key, 256, "volume%d.xlator0.caps%d", count, + caps++); + buf = GF_MALLOC (256, gf_common_mt_char); + if (!buf) { + ret = ENOMEM; + goto out; + } + snprintf (buf, 256, "offload_snapshot"); + ret = dict_set_dynstr (volumes, key, buf); + if (ret) { + GF_FREE (buf); + goto out; + } + } + } #endif diff --git a/xlators/mgmt/glusterd/src/glusterd-volume-ops.c b/xlators/mgmt/glusterd/src/glusterd-volume-ops.c index a2bd7334c93..561ff652d81 100644 --- a/xlators/mgmt/glusterd/src/glusterd-volume-ops.c +++ b/xlators/mgmt/glusterd/src/glusterd-volume-ops.c @@ -665,7 +665,7 @@ glusterd_is_valid_vg (glusterd_brickinfo_t *brick, int check_tag, char *msg) } next: - brick->caps = CAPS_BD; + brick->caps = CAPS_BD | CAPS_OFFLOAD_COPY | CAPS_OFFLOAD_SNAPSHOT; dm_lvlist = lvm_vg_list_lvs (vg); if (!dm_lvlist) @@ -953,7 +953,6 @@ glusterd_op_stage_start_volume (dict_t *dict, char **op_errstr) } } - list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) { ret = glusterd_resolve_brick (brickinfo); if (ret) { @@ -1011,8 +1010,8 @@ glusterd_op_stage_start_volume (dict_t *dict, char **op_errstr) } #ifdef HAVE_BD_XLATOR if (brickinfo->vg[0]) - caps = CAPS_BD | CAPS_THIN; - + caps = CAPS_BD | CAPS_THIN | + CAPS_OFFLOAD_COPY | CAPS_OFFLOAD_SNAPSHOT; /* Check for VG/thin pool if its BD volume */ if (brickinfo->vg[0]) { ret = glusterd_is_valid_vg (brickinfo, 0, msg); @@ -1602,7 +1601,7 @@ glusterd_op_create_volume (dict_t *dict, char **op_errstr) if (count) brick = strtok_r (brick_list+1, " \n", &saveptr); - caps = CAPS_BD | CAPS_THIN; + caps = CAPS_BD | CAPS_THIN | CAPS_OFFLOAD_COPY | CAPS_OFFLOAD_SNAPSHOT; while ( i <= count) { ret = glusterd_brickinfo_new_from_brick (brick, &brickinfo); diff --git a/xlators/mgmt/glusterd/src/glusterd.h b/xlators/mgmt/glusterd/src/glusterd.h index 6423d5a8154..ad63682e55e 100644 --- a/xlators/mgmt/glusterd/src/glusterd.h +++ b/xlators/mgmt/glusterd/src/glusterd.h @@ -234,8 +234,10 @@ struct _auth { typedef struct _auth auth_t; /* Capabilities of xlator */ -#define CAPS_BD 0x00000001 -#define CAPS_THIN 0x00000010 +#define CAPS_BD 0x00000001 +#define CAPS_THIN 0x00000002 +#define CAPS_OFFLOAD_COPY 0x00000004 +#define CAPS_OFFLOAD_SNAPSHOT 0x00000008 struct glusterd_rebalance_ { gf_defrag_status_t defrag_status; -- cgit