On Thu, May 14, 2015 at 06:00:51PM -0500, Eric Sandeen wrote:
> This adds a new superblock field, sb_meta_uuid. If set, along with
> a new incompat flag, the code will use that field on a V5 filesystem
> to compare to metadata UUIDs, which allows us to change the user-
> visible UUID at will. Userspace handles the setting and clearing
> of the incompat flag as appropriate, as the UUID gets changed; i.e.
> setting the user-visible UUID back to the original UUID (as stored in
> the new field) will remove the incompatible feature flag.
>
> If the incompat flag is not set, this copies the user-visible UUID into
> into the meta_uuid slot in memory when the superblock is read from disk;
> the meta_uuid field is not written back to disk in this case.
>
> The remainder of this patch simply switches verifiers, initializers,
> etc to use the new sb_meta_uuid field.
>
> Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
> ---
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
>
> V5: bools and structs and xfs_copy()s to match kernelspace...
>
>
> diff --git a/copy/xfs_copy.c b/copy/xfs_copy.c
> index 279527c..5cef8d2 100644
> --- a/copy/xfs_copy.c
> +++ b/copy/xfs_copy.c
> @@ -466,6 +466,37 @@ write_wbuf(void)
> sighold(SIGCHLD);
> }
>
> +void
> +sb_update_uuid(
> + xfs_sb_t *sb,
> + ag_header_t *ag_hdr,
> + thread_args *tcarg)
> +{
> + /*
> + * If this filesystem has CRCs, the original UUID is stamped into
> + * all metadata. If the new UUID is different, We need to copy the
> + * original UUID into the meta_uuid slot and set the incompat flag
> + * if that hasn't already been done.
> + */
> + if (xfs_sb_version_hascrc(sb) &&
> + platform_uuid_compare(&tcarg->uuid, &ag_hdr->xfs_sb->sb_uuid) &&
> + !xfs_sb_version_hasmetauuid(sb)) {
> + __be32 feat;
> +
> + feat = be32_to_cpu(ag_hdr->xfs_sb->sb_features_incompat);
> + feat |= XFS_SB_FEAT_INCOMPAT_META_UUID;
> + ag_hdr->xfs_sb->sb_features_incompat = cpu_to_be32(feat);
> + platform_uuid_copy(&ag_hdr->xfs_sb->sb_meta_uuid,
> + &ag_hdr->xfs_sb->sb_uuid);
> + }
> +
> + platform_uuid_copy(&ag_hdr->xfs_sb->sb_uuid, &tcarg->uuid);
> +
> + /* We might have changed the UUID, so update the superblock CRC */
> + if (xfs_sb_version_hascrc(sb))
> + xfs_update_cksum((char *)ag_hdr->xfs_sb, sb->sb_sectsize,
> + XFS_SB_CRC_OFF);
> +}
>
> int
> main(int argc, char **argv)
> @@ -659,16 +690,6 @@ main(int argc, char **argv)
> sb = &mbuf.m_sb;
> libxfs_sb_from_disk(sb, XFS_BUF_TO_SBP(sbp));
>
> - /*
> - * For now, V5 superblock filesystems are not supported without -d;
> - * we do not have the infrastructure yet to fix CRCs when a new UUID
> - * is generated.
> - */
> - if (xfs_sb_version_hascrc(sb) && !duplicate) {
> - do_log(_("%s: Cannot yet copy V5 fs without '-d'\n"), progname);
> - exit(1);
> - }
> -
> mp = libxfs_mount(&mbuf, sb, xargs.ddev, xargs.logdev, xargs.rtdev, 0);
> if (mp == NULL) {
> do_log(_("%s: %s filesystem failed to initialize\n"
> @@ -1127,8 +1148,7 @@ main(int argc, char **argv)
> /* do each thread in turn, each has its own UUID */
>
> for (j = 0, tcarg = targ; j < num_targets; j++) {
> - platform_uuid_copy(&ag_hdr.xfs_sb->sb_uuid,
> - &tcarg->uuid);
> + sb_update_uuid(sb, &ag_hdr, tcarg);
> do_write(tcarg);
> tcarg++;
> }
> diff --git a/db/sb.c b/db/sb.c
> index cd12f83..a1dd039 100644
> --- a/db/sb.c
> +++ b/db/sb.c
> @@ -29,6 +29,8 @@
> #include "output.h"
> #include "init.h"
>
> +#define uuid_equal(s,d) (platform_uuid_compare((s),(d)) == 0)
> +
> static int sb_f(int argc, char **argv);
> static void sb_help(void);
> static int uuid_f(int argc, char **argv);
> @@ -121,6 +123,7 @@ const field_t sb_flds[] = {
> { "crc", FLDT_CRC, OI(OFF(crc)), C1, 0, TYP_NONE },
> { "pquotino", FLDT_INO, OI(OFF(pquotino)), C1, 0, TYP_INODE },
> { "lsn", FLDT_UINT64X, OI(OFF(lsn)), C1, 0, TYP_NONE },
> + { "meta_uuid", FLDT_UUID, OI(OFF(meta_uuid)), C1, 0, TYP_NONE },
> { NULL }
> };
>
> @@ -334,6 +337,32 @@ do_uuid(xfs_agnumber_t agno, uuid_t *uuid)
> return &uu;
> }
> /* set uuid */
> + if (!xfs_sb_version_hascrc(&tsb))
> + goto write;
> + /*
> + * If we have CRCs, and this UUID differs from that stamped in the
> + * metadata, set the incompat flag and copy the old one to the
> + * metadata-specific location.
> + *
> + * If we are setting the user-visible UUID back to match the metadata
> + * UUID, clear the metadata-specific location and the incompat flag.
> + */
> + if (!xfs_sb_version_hasmetauuid(&tsb) &&
> + !uuid_equal(uuid, &mp->m_sb.sb_meta_uuid)) {
> + mp->m_sb.sb_features_incompat |= XFS_SB_FEAT_INCOMPAT_META_UUID;
> + tsb.sb_features_incompat |= XFS_SB_FEAT_INCOMPAT_META_UUID;
> + memcpy(&tsb.sb_meta_uuid, &tsb.sb_uuid, sizeof(uuid_t));
> + } else if (xfs_sb_version_hasmetauuid(&tsb) &&
> + uuid_equal(uuid, &mp->m_sb.sb_meta_uuid)) {
> + memset(&tsb.sb_meta_uuid, 0, sizeof(uuid_t));
> + /* Write those zeros now; it's ignored once we clear the flag */
> + libxfs_sb_to_disk(iocur_top->data, &tsb);
> + mp->m_sb.sb_features_incompat &=
> + ~XFS_SB_FEAT_INCOMPAT_META_UUID;
> + tsb.sb_features_incompat &= ~XFS_SB_FEAT_INCOMPAT_META_UUID;
> + }
> +
> +write:
> memcpy(&tsb.sb_uuid, uuid, sizeof(uuid_t));
> libxfs_sb_to_disk(iocur_top->data, &tsb);
> write_cur();
> @@ -363,18 +392,6 @@ uuid_f(
> return 0;
> }
>
> - /*
> - * For now, changing the UUID of V5 superblock filesystems is
> - * not supported; we do not have the infrastructure to fix all
> - * other metadata when a new superblock UUID is generated.
> - */
> - if (xfs_sb_version_hascrc(&mp->m_sb) &&
> - strcasecmp(argv[1], "rewrite")) {
> - dbprintf(_("%s: only 'rewrite' supported on V5 fs\n"),
> - progname);
> - return 0;
> - }
> -
> if (!strcasecmp(argv[1], "generate")) {
> platform_uuid_generate(&uu);
> } else if (!strcasecmp(argv[1], "nil")) {
> @@ -388,6 +405,17 @@ uuid_f(
> memcpy(&uu, uup, sizeof(uuid_t));
> platform_uuid_unparse(&uu, bp);
> dbprintf(_("old UUID = %s\n"), bp);
> + } else if (!strcasecmp(argv[1], "restore")) {
> + xfs_sb_t tsb;
> +
> + if (!get_sb(0, &tsb))
> + return 0;
> +
> + /* Not set; nothing to do. Success! */
> + if (!xfs_sb_version_hasmetauuid(&tsb))
> + return 0;
> +
> + memcpy(&uu, mp->m_sb.sb_meta_uuid, sizeof(uuid_t));
> } else {
> if (platform_uuid_parse(argv[1], &uu)) {
> dbprintf(_("invalid UUID\n"));
> @@ -660,6 +688,8 @@ version_string(
> strcat(s, ",CRC");
> if (xfs_sb_version_hasftype(sbp))
> strcat(s, ",FTYPE");
> + if (xfs_sb_version_hasmetauuid(sbp))
> + strcat(s, ",META_UUID");
> return s;
> }
>
> diff --git a/libxfs/xfs_alloc.c b/libxfs/xfs_alloc.c
> index 23e3c53..62dce1e 100644
> --- a/libxfs/xfs_alloc.c
> +++ b/libxfs/xfs_alloc.c
> @@ -446,7 +446,7 @@ xfs_agfl_verify(
> struct xfs_agfl *agfl = XFS_BUF_TO_AGFL(bp);
> int i;
>
> - if (!uuid_equal(&agfl->agfl_uuid, &mp->m_sb.sb_uuid))
> + if (!uuid_equal(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid))
> return false;
> if (be32_to_cpu(agfl->agfl_magicnum) != XFS_AGFL_MAGIC)
> return false;
> @@ -2199,7 +2199,7 @@ xfs_agf_verify(
> struct xfs_agf *agf = XFS_BUF_TO_AGF(bp);
>
> if (xfs_sb_version_hascrc(&mp->m_sb) &&
> - !uuid_equal(&agf->agf_uuid, &mp->m_sb.sb_uuid))
> + !uuid_equal(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid))
> return false;
>
> if (!(agf->agf_magicnum == cpu_to_be32(XFS_AGF_MAGIC) &&
> diff --git a/libxfs/xfs_alloc_btree.c b/libxfs/xfs_alloc_btree.c
> index 7fd72af..e60538a 100644
> --- a/libxfs/xfs_alloc_btree.c
> +++ b/libxfs/xfs_alloc_btree.c
> @@ -293,7 +293,7 @@ xfs_allocbt_verify(
> case cpu_to_be32(XFS_ABTB_CRC_MAGIC):
> if (!xfs_sb_version_hascrc(&mp->m_sb))
> return false;
> - if (!uuid_equal(&block->bb_u.s.bb_uuid, &mp->m_sb.sb_uuid))
> + if (!uuid_equal(&block->bb_u.s.bb_uuid, &mp->m_sb.sb_meta_uuid))
> return false;
> if (block->bb_u.s.bb_blkno != cpu_to_be64(bp->b_bn))
> return false;
> @@ -311,7 +311,7 @@ xfs_allocbt_verify(
> case cpu_to_be32(XFS_ABTC_CRC_MAGIC):
> if (!xfs_sb_version_hascrc(&mp->m_sb))
> return false;
> - if (!uuid_equal(&block->bb_u.s.bb_uuid, &mp->m_sb.sb_uuid))
> + if (!uuid_equal(&block->bb_u.s.bb_uuid, &mp->m_sb.sb_meta_uuid))
> return false;
> if (block->bb_u.s.bb_blkno != cpu_to_be64(bp->b_bn))
> return false;
> diff --git a/libxfs/xfs_attr_leaf.c b/libxfs/xfs_attr_leaf.c
> index 200bd30..69b6af3 100644
> --- a/libxfs/xfs_attr_leaf.c
> +++ b/libxfs/xfs_attr_leaf.c
> @@ -258,7 +258,7 @@ xfs_attr3_leaf_verify(
> if (ichdr.magic != XFS_ATTR3_LEAF_MAGIC)
> return false;
>
> - if (!uuid_equal(&hdr3->info.uuid, &mp->m_sb.sb_uuid))
> + if (!uuid_equal(&hdr3->info.uuid, &mp->m_sb.sb_meta_uuid))
> return false;
> if (be64_to_cpu(hdr3->info.blkno) != bp->b_bn)
> return false;
> @@ -1052,7 +1052,7 @@ xfs_attr3_leaf_create(
>
> hdr3->blkno = cpu_to_be64(bp->b_bn);
> hdr3->owner = cpu_to_be64(dp->i_ino);
> - uuid_copy(&hdr3->uuid, &mp->m_sb.sb_uuid);
> + uuid_copy(&hdr3->uuid, &mp->m_sb.sb_meta_uuid);
>
> ichdr.freemap[0].base = sizeof(struct xfs_attr3_leaf_hdr);
> } else {
> diff --git a/libxfs/xfs_attr_remote.c b/libxfs/xfs_attr_remote.c
> index 4f492c1..5feaf55 100644
> --- a/libxfs/xfs_attr_remote.c
> +++ b/libxfs/xfs_attr_remote.c
> @@ -95,7 +95,7 @@ xfs_attr3_rmt_verify(
> return false;
> if (rmt->rm_magic != cpu_to_be32(XFS_ATTR3_RMT_MAGIC))
> return false;
> - if (!uuid_equal(&rmt->rm_uuid, &mp->m_sb.sb_uuid))
> + if (!uuid_equal(&rmt->rm_uuid, &mp->m_sb.sb_meta_uuid))
> return false;
> if (be64_to_cpu(rmt->rm_blkno) != bno)
> return false;
> @@ -212,7 +212,7 @@ xfs_attr3_rmt_hdr_set(
> rmt->rm_magic = cpu_to_be32(XFS_ATTR3_RMT_MAGIC);
> rmt->rm_offset = cpu_to_be32(offset);
> rmt->rm_bytes = cpu_to_be32(size);
> - uuid_copy(&rmt->rm_uuid, &mp->m_sb.sb_uuid);
> + uuid_copy(&rmt->rm_uuid, &mp->m_sb.sb_meta_uuid);
> rmt->rm_owner = cpu_to_be64(ino);
> rmt->rm_blkno = cpu_to_be64(bno);
>
> diff --git a/libxfs/xfs_bmap_btree.c b/libxfs/xfs_bmap_btree.c
> index 2fd04e0..f42bc2d 100644
> --- a/libxfs/xfs_bmap_btree.c
> +++ b/libxfs/xfs_bmap_btree.c
> @@ -346,7 +346,8 @@ xfs_bmbt_to_bmdr(
>
> if (xfs_sb_version_hascrc(&mp->m_sb)) {
> ASSERT(rblock->bb_magic == cpu_to_be32(XFS_BMAP_CRC_MAGIC));
> - ASSERT(uuid_equal(&rblock->bb_u.l.bb_uuid, &mp->m_sb.sb_uuid));
> + ASSERT(uuid_equal(&rblock->bb_u.l.bb_uuid,
> + &mp->m_sb.sb_meta_uuid));
> ASSERT(rblock->bb_u.l.bb_blkno ==
> cpu_to_be64(XFS_BUF_DADDR_NULL));
> } else
> @@ -644,7 +645,7 @@ xfs_bmbt_verify(
> case cpu_to_be32(XFS_BMAP_CRC_MAGIC):
> if (!xfs_sb_version_hascrc(&mp->m_sb))
> return false;
> - if (!uuid_equal(&block->bb_u.l.bb_uuid, &mp->m_sb.sb_uuid))
> + if (!uuid_equal(&block->bb_u.l.bb_uuid, &mp->m_sb.sb_meta_uuid))
> return false;
> if (be64_to_cpu(block->bb_u.l.bb_blkno) != bp->b_bn)
> return false;
> diff --git a/libxfs/xfs_btree.c b/libxfs/xfs_btree.c
> index 203e7d2..a16ae7d 100644
> --- a/libxfs/xfs_btree.c
> +++ b/libxfs/xfs_btree.c
> @@ -62,7 +62,8 @@ xfs_btree_check_lblock(
>
> if (xfs_sb_version_hascrc(&mp->m_sb)) {
> lblock_ok = lblock_ok &&
> - uuid_equal(&block->bb_u.l.bb_uuid, &mp->m_sb.sb_uuid) &&
> + uuid_equal(&block->bb_u.l.bb_uuid,
> + &mp->m_sb.sb_meta_uuid) &&
> block->bb_u.l.bb_blkno == cpu_to_be64(
> bp ? bp->b_bn : XFS_BUF_DADDR_NULL);
> }
> @@ -112,7 +113,8 @@ xfs_btree_check_sblock(
>
> if (xfs_sb_version_hascrc(&mp->m_sb)) {
> sblock_ok = sblock_ok &&
> - uuid_equal(&block->bb_u.s.bb_uuid, &mp->m_sb.sb_uuid) &&
> + uuid_equal(&block->bb_u.s.bb_uuid,
> + &mp->m_sb.sb_meta_uuid) &&
> block->bb_u.s.bb_blkno == cpu_to_be64(
> bp ? bp->b_bn : XFS_BUF_DADDR_NULL);
> }
> @@ -997,7 +999,7 @@ xfs_btree_init_block_int(
> if (flags & XFS_BTREE_CRC_BLOCKS) {
> buf->bb_u.l.bb_blkno = cpu_to_be64(blkno);
> buf->bb_u.l.bb_owner = cpu_to_be64(owner);
> - uuid_copy(&buf->bb_u.l.bb_uuid, &mp->m_sb.sb_uuid);
> + uuid_copy(&buf->bb_u.l.bb_uuid, &mp->m_sb.sb_meta_uuid);
> buf->bb_u.l.bb_pad = 0;
> buf->bb_u.l.bb_lsn = 0;
> }
> @@ -1010,7 +1012,7 @@ xfs_btree_init_block_int(
> if (flags & XFS_BTREE_CRC_BLOCKS) {
> buf->bb_u.s.bb_blkno = cpu_to_be64(blkno);
> buf->bb_u.s.bb_owner = cpu_to_be32(__owner);
> - uuid_copy(&buf->bb_u.s.bb_uuid, &mp->m_sb.sb_uuid);
> + uuid_copy(&buf->bb_u.s.bb_uuid, &mp->m_sb.sb_meta_uuid);
> buf->bb_u.s.bb_lsn = 0;
> }
> }
> diff --git a/libxfs/xfs_da_btree.c b/libxfs/xfs_da_btree.c
> index 441bef4..3de4cd3 100644
> --- a/libxfs/xfs_da_btree.c
> +++ b/libxfs/xfs_da_btree.c
> @@ -142,7 +142,7 @@ xfs_da3_node_verify(
> if (ichdr.magic != XFS_DA3_NODE_MAGIC)
> return false;
>
> - if (!uuid_equal(&hdr3->info.uuid, &mp->m_sb.sb_uuid))
> + if (!uuid_equal(&hdr3->info.uuid, &mp->m_sb.sb_meta_uuid))
> return false;
> if (be64_to_cpu(hdr3->info.blkno) != bp->b_bn)
> return false;
> @@ -320,7 +320,7 @@ xfs_da3_node_create(
> ichdr.magic = XFS_DA3_NODE_MAGIC;
> hdr3->info.blkno = cpu_to_be64(bp->b_bn);
> hdr3->info.owner = cpu_to_be64(args->dp->i_ino);
> - uuid_copy(&hdr3->info.uuid, &mp->m_sb.sb_uuid);
> + uuid_copy(&hdr3->info.uuid, &mp->m_sb.sb_meta_uuid);
> } else {
> ichdr.magic = XFS_DA_NODE_MAGIC;
> }
> diff --git a/libxfs/xfs_dir2_block.c b/libxfs/xfs_dir2_block.c
> index f061a99..489f301 100644
> --- a/libxfs/xfs_dir2_block.c
> +++ b/libxfs/xfs_dir2_block.c
> @@ -64,7 +64,7 @@ xfs_dir3_block_verify(
> if (xfs_sb_version_hascrc(&mp->m_sb)) {
> if (hdr3->magic != cpu_to_be32(XFS_DIR3_BLOCK_MAGIC))
> return false;
> - if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_uuid))
> + if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_meta_uuid))
> return false;
> if (be64_to_cpu(hdr3->blkno) != bp->b_bn)
> return false;
> @@ -154,7 +154,7 @@ xfs_dir3_block_init(
> hdr3->magic = cpu_to_be32(XFS_DIR3_BLOCK_MAGIC);
> hdr3->blkno = cpu_to_be64(bp->b_bn);
> hdr3->owner = cpu_to_be64(dp->i_ino);
> - uuid_copy(&hdr3->uuid, &mp->m_sb.sb_uuid);
> + uuid_copy(&hdr3->uuid, &mp->m_sb.sb_meta_uuid);
> return;
>
> }
> diff --git a/libxfs/xfs_dir2_data.c b/libxfs/xfs_dir2_data.c
> index 609c097..c475ba8 100644
> --- a/libxfs/xfs_dir2_data.c
> +++ b/libxfs/xfs_dir2_data.c
> @@ -218,7 +218,7 @@ xfs_dir3_data_verify(
> if (xfs_sb_version_hascrc(&mp->m_sb)) {
> if (hdr3->magic != cpu_to_be32(XFS_DIR3_DATA_MAGIC))
> return false;
> - if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_uuid))
> + if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_meta_uuid))
> return false;
> if (be64_to_cpu(hdr3->blkno) != bp->b_bn)
> return false;
> @@ -602,7 +602,7 @@ xfs_dir3_data_init(
> hdr3->magic = cpu_to_be32(XFS_DIR3_DATA_MAGIC);
> hdr3->blkno = cpu_to_be64(bp->b_bn);
> hdr3->owner = cpu_to_be64(dp->i_ino);
> - uuid_copy(&hdr3->uuid, &mp->m_sb.sb_uuid);
> + uuid_copy(&hdr3->uuid, &mp->m_sb.sb_meta_uuid);
>
> } else
> hdr->magic = cpu_to_be32(XFS_DIR2_DATA_MAGIC);
> diff --git a/libxfs/xfs_dir2_leaf.c b/libxfs/xfs_dir2_leaf.c
> index c2dba8a..80d03b3 100644
> --- a/libxfs/xfs_dir2_leaf.c
> +++ b/libxfs/xfs_dir2_leaf.c
> @@ -158,7 +158,7 @@ xfs_dir3_leaf_verify(
>
> if (leaf3->info.hdr.magic != cpu_to_be16(magic3))
> return false;
> - if (!uuid_equal(&leaf3->info.uuid, &mp->m_sb.sb_uuid))
> + if (!uuid_equal(&leaf3->info.uuid, &mp->m_sb.sb_meta_uuid))
> return false;
> if (be64_to_cpu(leaf3->info.blkno) != bp->b_bn)
> return false;
> @@ -308,7 +308,7 @@ xfs_dir3_leaf_init(
> : cpu_to_be16(XFS_DIR3_LEAFN_MAGIC);
> leaf3->info.blkno = cpu_to_be64(bp->b_bn);
> leaf3->info.owner = cpu_to_be64(owner);
> - uuid_copy(&leaf3->info.uuid, &mp->m_sb.sb_uuid);
> + uuid_copy(&leaf3->info.uuid, &mp->m_sb.sb_meta_uuid);
> } else {
> memset(leaf, 0, sizeof(*leaf));
> leaf->hdr.info.magic = cpu_to_be16(type);
> diff --git a/libxfs/xfs_dir2_node.c b/libxfs/xfs_dir2_node.c
> index 3b71e9e..581d648 100644
> --- a/libxfs/xfs_dir2_node.c
> +++ b/libxfs/xfs_dir2_node.c
> @@ -91,7 +91,7 @@ xfs_dir3_free_verify(
>
> if (hdr3->magic != cpu_to_be32(XFS_DIR3_FREE_MAGIC))
> return false;
> - if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_uuid))
> + if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_meta_uuid))
> return false;
> if (be64_to_cpu(hdr3->blkno) != bp->b_bn)
> return false;
> @@ -224,7 +224,7 @@ xfs_dir3_free_get_buf(
>
> hdr3->hdr.blkno = cpu_to_be64(bp->b_bn);
> hdr3->hdr.owner = cpu_to_be64(dp->i_ino);
> - uuid_copy(&hdr3->hdr.uuid, &mp->m_sb.sb_uuid);
> + uuid_copy(&hdr3->hdr.uuid, &mp->m_sb.sb_meta_uuid);
> } else
> hdr.magic = XFS_DIR2_FREE_MAGIC;
> dp->d_ops->free_hdr_to_disk(bp->b_addr, &hdr);
> diff --git a/libxfs/xfs_dquot_buf.c b/libxfs/xfs_dquot_buf.c
> index 2e0484a..1a2546b 100644
> --- a/libxfs/xfs_dquot_buf.c
> +++ b/libxfs/xfs_dquot_buf.c
> @@ -171,7 +171,7 @@ xfs_dqcheck(
> d->dd_diskdq.d_id = cpu_to_be32(id);
>
> if (xfs_sb_version_hascrc(&mp->m_sb)) {
> - uuid_copy(&d->dd_uuid, &mp->m_sb.sb_uuid);
> + uuid_copy(&d->dd_uuid, &mp->m_sb.sb_meta_uuid);
> xfs_update_cksum((char *)d, sizeof(struct xfs_dqblk),
> XFS_DQUOT_CRC_OFF);
> }
> @@ -206,7 +206,7 @@ xfs_dquot_buf_verify_crc(
> if (!xfs_verify_cksum((char *)d, sizeof(struct xfs_dqblk),
> XFS_DQUOT_CRC_OFF))
> return false;
> - if (!uuid_equal(&d->dd_uuid, &mp->m_sb.sb_uuid))
> + if (!uuid_equal(&d->dd_uuid, &mp->m_sb.sb_meta_uuid))
> return false;
> }
> return true;
> diff --git a/libxfs/xfs_format.h b/libxfs/xfs_format.h
> index 4d313d3..12ddcf9 100644
> --- a/libxfs/xfs_format.h
> +++ b/libxfs/xfs_format.h
> @@ -100,7 +100,7 @@ typedef struct xfs_sb {
> xfs_rfsblock_t sb_dblocks; /* number of data blocks */
> xfs_rfsblock_t sb_rblocks; /* number of realtime blocks */
> xfs_rtblock_t sb_rextents; /* number of realtime extents */
> - uuid_t sb_uuid; /* file system unique id */
> + uuid_t sb_uuid; /* user-visible file system unique id */
> xfs_fsblock_t sb_logstart; /* starting block of log if internal */
> xfs_ino_t sb_rootino; /* root inode number */
> xfs_ino_t sb_rbmino; /* bitmap inode for realtime extents */
> @@ -174,6 +174,7 @@ typedef struct xfs_sb {
>
> xfs_ino_t sb_pquotino; /* project quota inode */
> xfs_lsn_t sb_lsn; /* last write sequence */
> + uuid_t sb_meta_uuid; /* metadata file system unique id */
>
> /* must be padded to 64 bit alignment */
> } xfs_sb_t;
> @@ -190,7 +191,7 @@ typedef struct xfs_dsb {
> __be64 sb_dblocks; /* number of data blocks */
> __be64 sb_rblocks; /* number of realtime blocks */
> __be64 sb_rextents; /* number of realtime extents */
> - uuid_t sb_uuid; /* file system unique id */
> + uuid_t sb_uuid; /* user-visible file system unique id */
> __be64 sb_logstart; /* starting block of log if internal */
> __be64 sb_rootino; /* root inode number */
> __be64 sb_rbmino; /* bitmap inode for realtime extents */
> @@ -260,6 +261,7 @@ typedef struct xfs_dsb {
>
> __be64 sb_pquotino; /* project quota inode */
> __be64 sb_lsn; /* last write sequence */
> + uuid_t sb_meta_uuid; /* metadata file system unique id */
>
> /* must be padded to 64 bit alignment */
> } xfs_dsb_t;
> @@ -457,8 +459,10 @@ xfs_sb_has_ro_compat_feature(
> }
>
> #define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */
> +#define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 1) /* metadata UUID */
> #define XFS_SB_FEAT_INCOMPAT_ALL \
> - (XFS_SB_FEAT_INCOMPAT_FTYPE)
> + (XFS_SB_FEAT_INCOMPAT_FTYPE | \
> + XFS_SB_FEAT_INCOMPAT_META_UUID)
>
> #define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL
> static inline bool
> @@ -507,6 +511,18 @@ static inline int xfs_sb_version_hasfinobt(xfs_sb_t *sbp)
> }
>
> /*
> + * XFS_SB_FEAT_INCOMPAT_META_UUID indicates that the metadata UUID
> + * is stored separately from the user-visible UUID; this allows the
> + * user-visible UUID to be changed on V5 filesystems which have a
> + * filesystem UUID stamped into every piece of metadata.
> + */
> +static inline bool xfs_sb_version_hasmetauuid(struct xfs_sb *sbp)
> +{
> + return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) &&
> + (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID);
> +}
> +
> +/*
> * end of superblock version macros
> */
>
> diff --git a/libxfs/xfs_ialloc.c b/libxfs/xfs_ialloc.c
> index 2b4e4e0..71af28e 100644
> --- a/libxfs/xfs_ialloc.c
> +++ b/libxfs/xfs_ialloc.c
> @@ -302,7 +302,8 @@ xfs_ialloc_inode_init(
> if (version == 3) {
> free->di_ino = cpu_to_be64(ino);
> ino++;
> - uuid_copy(&free->di_uuid, &mp->m_sb.sb_uuid);
> + uuid_copy(&free->di_uuid,
> + &mp->m_sb.sb_meta_uuid);
> xfs_dinode_calc_crc(mp, free);
> } else if (tp) {
> /* just log the inode core */
> @@ -2044,7 +2045,7 @@ xfs_agi_verify(
> struct xfs_agi *agi = XFS_BUF_TO_AGI(bp);
>
> if (xfs_sb_version_hascrc(&mp->m_sb) &&
> - !uuid_equal(&agi->agi_uuid, &mp->m_sb.sb_uuid))
> + !uuid_equal(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid))
> return false;
> /*
> * Validate the magic number of the agi block.
> diff --git a/libxfs/xfs_ialloc_btree.c b/libxfs/xfs_ialloc_btree.c
> index 9ac143a..e8ec5e7 100644
> --- a/libxfs/xfs_ialloc_btree.c
> +++ b/libxfs/xfs_ialloc_btree.c
> @@ -229,7 +229,7 @@ xfs_inobt_verify(
> case cpu_to_be32(XFS_FIBT_CRC_MAGIC):
> if (!xfs_sb_version_hascrc(&mp->m_sb))
> return false;
> - if (!uuid_equal(&block->bb_u.s.bb_uuid, &mp->m_sb.sb_uuid))
> + if (!uuid_equal(&block->bb_u.s.bb_uuid, &mp->m_sb.sb_meta_uuid))
> return false;
> if (block->bb_u.s.bb_blkno != cpu_to_be64(bp->b_bn))
> return false;
> diff --git a/libxfs/xfs_inode_buf.c b/libxfs/xfs_inode_buf.c
> index fd48f04..3f20303 100644
> --- a/libxfs/xfs_inode_buf.c
> +++ b/libxfs/xfs_inode_buf.c
> @@ -304,7 +304,7 @@ xfs_dinode_verify(
> return false;
> if (be64_to_cpu(dip->di_ino) != ino)
> return false;
> - if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_uuid))
> + if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_meta_uuid))
> return false;
> return true;
> }
> @@ -366,7 +366,7 @@ xfs_iread(
> if (xfs_sb_version_hascrc(&mp->m_sb)) {
> ip->i_d.di_version = 3;
> ip->i_d.di_ino = ip->i_ino;
> - uuid_copy(&ip->i_d.di_uuid, &mp->m_sb.sb_uuid);
> + uuid_copy(&ip->i_d.di_uuid, &mp->m_sb.sb_meta_uuid);
> } else
> ip->i_d.di_version = 2;
> return 0;
> diff --git a/libxfs/xfs_sb.c b/libxfs/xfs_sb.c
> index 6844cd8..0ffc497 100644
> --- a/libxfs/xfs_sb.c
> +++ b/libxfs/xfs_sb.c
> @@ -360,6 +360,14 @@ __xfs_sb_from_disk(
> to->sb_pad = 0;
> to->sb_pquotino = be64_to_cpu(from->sb_pquotino);
> to->sb_lsn = be64_to_cpu(from->sb_lsn);
> + /*
> + * sb_meta_uuid is only on disk if it differs from sb_uuid and the
> + * feature flag is set; if not set we keep it only in memory.
> + */
> + if (xfs_sb_version_hasmetauuid(to))
> + uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid);
> + else
> + uuid_copy(&to->sb_meta_uuid, &from->sb_uuid);
> /* Convert on-disk flags to in-memory flags? */
> if (convert_xquota)
> xfs_sb_quota_from_disk(to);
> @@ -501,6 +509,8 @@ xfs_sb_to_disk(
> cpu_to_be32(from->sb_features_log_incompat);
> to->sb_pad = 0;
> to->sb_lsn = cpu_to_be64(from->sb_lsn);
> + if (xfs_sb_version_hasmetauuid(from))
> + uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid);
> }
> }
>
> diff --git a/libxfs/xfs_symlink_remote.c b/libxfs/xfs_symlink_remote.c
> index 6bc5af5..7d46d9e 100644
> --- a/libxfs/xfs_symlink_remote.c
> +++ b/libxfs/xfs_symlink_remote.c
> @@ -60,7 +60,7 @@ xfs_symlink_hdr_set(
> dsl->sl_magic = cpu_to_be32(XFS_SYMLINK_MAGIC);
> dsl->sl_offset = cpu_to_be32(offset);
> dsl->sl_bytes = cpu_to_be32(size);
> - uuid_copy(&dsl->sl_uuid, &mp->m_sb.sb_uuid);
> + uuid_copy(&dsl->sl_uuid, &mp->m_sb.sb_meta_uuid);
> dsl->sl_owner = cpu_to_be64(ino);
> dsl->sl_blkno = cpu_to_be64(bp->b_bn);
> bp->b_ops = &xfs_symlink_buf_ops;
> @@ -104,7 +104,7 @@ xfs_symlink_verify(
> return false;
> if (dsl->sl_magic != cpu_to_be32(XFS_SYMLINK_MAGIC))
> return false;
> - if (!uuid_equal(&dsl->sl_uuid, &mp->m_sb.sb_uuid))
> + if (!uuid_equal(&dsl->sl_uuid, &mp->m_sb.sb_meta_uuid))
> return false;
> if (bp->b_bn != be64_to_cpu(dsl->sl_blkno))
> return false;
> diff --git a/libxlog/util.c b/libxlog/util.c
> index 053cf04..fd1011f 100644
> --- a/libxlog/util.c
> +++ b/libxlog/util.c
> @@ -29,8 +29,10 @@ header_check_uuid(xfs_mount_t *mp, xlog_rec_header_t *head)
> {
> char uu_log[64], uu_sb[64];
>
> - if (print_skip_uuid) return 0;
> - if (!platform_uuid_compare(&mp->m_sb.sb_uuid, &head->h_fs_uuid)) return 0;
> + if (print_skip_uuid)
> + return 0;
> + if (!platform_uuid_compare(&mp->m_sb.sb_uuid, &head->h_fs_uuid))
> + return 0;
>
> platform_uuid_unparse(&mp->m_sb.sb_uuid, uu_sb);
> platform_uuid_unparse(&head->h_fs_uuid, uu_log);
> diff --git a/man/man8/xfs_admin.8 b/man/man8/xfs_admin.8
> index b393d74..c17b35e 100644
> --- a/man/man8/xfs_admin.8
> +++ b/man/man8/xfs_admin.8
> @@ -98,7 +98,12 @@ The
> .I uuid
> may also be
> .BR generate ,
> -which will generate a new UUID for the filesystem.
> +which will generate a new UUID for the filesystem. Note that on CRC-enabled
> +filesystems, this will set an incompatible flag such that older kernels will
> +not be able to mount the filesystem. To remove this incompatible flag, use
> +.BR restore ,
> +which will restore the original UUID and remove the incompatible
> +feature flag as needed.
> .TP
> .B \-V
> Prints the version number and exits.
> diff --git a/man/man8/xfs_db.8 b/man/man8/xfs_db.8
> index d527230..df54bb7 100644
> --- a/man/man8/xfs_db.8
> +++ b/man/man8/xfs_db.8
> @@ -664,7 +664,7 @@ The possible data types are:
> .BR sb ", " symlink " and " text .
> See the TYPES section below for more information on these data types.
> .TP
> -.BI "uuid [" uuid " | " generate " | " rewrite ]
> +.BI "uuid [" uuid " | " generate " | " rewrite " | " restore ]
> Set the filesystem universally unique identifier (UUID).
> The filesystem UUID can be used by
> .BR mount (8)
> @@ -675,7 +675,12 @@ can be set directly to the desired UUID, or it can
> be automatically generated using the
> .B generate
> option. These options will both write the UUID into every copy of the
> -superblock in the filesystem.
> +superblock in the filesystem. On a CRC-enabled filesystem, this will
> +set an incompatible superblock flag, and the filesystem will not be
> +mountable with older kernels. This can be reverted with the
> +.B restore
> +option, which will copy the original UUID back into place and clear
> +the incompatible flag as needed.
> .B rewrite
> copies the current UUID from the primary superblock
> to all secondary copies of the superblock.
> diff --git a/mkfs/xfs_mkfs.c b/mkfs/xfs_mkfs.c
> index 1770666..cb9f7f5 100644
> --- a/mkfs/xfs_mkfs.c
> +++ b/mkfs/xfs_mkfs.c
> @@ -2598,6 +2598,8 @@ _("size %s specified for log subvolume is too large, maximum is %lld blocks\n"),
> sbp->sb_rextents = rtextents;
> platform_uuid_generate(&uuid);
> platform_uuid_copy(&sbp->sb_uuid, &uuid);
> + /* Only in memory; libxfs expects this as if read from disk */
> + platform_uuid_copy(&sbp->sb_meta_uuid, &uuid);
> sbp->sb_logstart = logstart;
> sbp->sb_rootino = sbp->sb_rbmino = sbp->sb_rsumino = NULLFSINO;
> sbp->sb_rextsize = rtextblocks;
> diff --git a/repair/agheader.c b/repair/agheader.c
> index 9ae2deb..cfca529 100644
> --- a/repair/agheader.c
> +++ b/repair/agheader.c
> @@ -112,7 +112,7 @@ verify_set_agf(xfs_mount_t *mp, xfs_agf_t *agf, xfs_agnumber_t i)
> if (!xfs_sb_version_hascrc(&mp->m_sb))
> return retval;
>
> - if (platform_uuid_compare(&agf->agf_uuid, &mp->m_sb.sb_uuid)) {
> + if (platform_uuid_compare(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid)) {
> char uu[64];
>
> retval = XR_AG_AGF;
> @@ -120,7 +120,8 @@ verify_set_agf(xfs_mount_t *mp, xfs_agf_t *agf, xfs_agnumber_t i)
> do_warn(_("bad uuid %s for agf %d\n"), uu, i);
>
> if (!no_modify)
> - platform_uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_uuid);
> + platform_uuid_copy(&agf->agf_uuid,
> + &mp->m_sb.sb_meta_uuid);
> }
> return retval;
> }
> @@ -190,7 +191,7 @@ verify_set_agi(xfs_mount_t *mp, xfs_agi_t *agi, xfs_agnumber_t agno)
> if (!xfs_sb_version_hascrc(&mp->m_sb))
> return retval;
>
> - if (platform_uuid_compare(&agi->agi_uuid, &mp->m_sb.sb_uuid)) {
> + if (platform_uuid_compare(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid)) {
> char uu[64];
>
> retval = XR_AG_AGI;
> @@ -198,7 +199,8 @@ verify_set_agi(xfs_mount_t *mp, xfs_agi_t *agi, xfs_agnumber_t agno)
> do_warn(_("bad uuid %s for agi %d\n"), uu, agno);
>
> if (!no_modify)
> - platform_uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_uuid);
> + platform_uuid_copy(&agi->agi_uuid,
> + &mp->m_sb.sb_meta_uuid);
> }
>
> return retval;
> @@ -245,7 +247,7 @@ compare_sb(xfs_mount_t *mp, xfs_sb_t *sb)
> * superblocks, not just the secondary superblocks.
> */
> static int
> -secondary_sb_wack(
> +secondary_sb_whack(
> struct xfs_mount *mp,
> struct xfs_buf *sbuf,
> struct xfs_sb *sb,
> @@ -267,7 +269,10 @@ secondary_sb_wack(
> *
> * size is the size of data which is valid for this sb.
> */
> - if (xfs_sb_version_hascrc(sb))
> + if (xfs_sb_version_hasmetauuid(sb))
> + size = offsetof(xfs_sb_t, sb_meta_uuid)
> + + sizeof(sb->sb_meta_uuid);
> + else if (xfs_sb_version_hascrc(sb))
> size = offsetof(xfs_sb_t, sb_lsn)
> + sizeof(sb->sb_lsn);
> else if (xfs_sb_version_hasmorebits(sb))
> @@ -511,7 +516,7 @@ verify_set_agheader(xfs_mount_t *mp, xfs_buf_t *sbuf, xfs_sb_t *sb,
> rval |= XR_AG_SB;
> }
>
> - rval |= secondary_sb_wack(mp, sbuf, sb, i);
> + rval |= secondary_sb_whack(mp, sbuf, sb, i);
>
> rval |= verify_set_agf(mp, agf, i);
> rval |= verify_set_agi(mp, agi, i);
> diff --git a/repair/agheader.h b/repair/agheader.h
> index 5541fb9..6b2974c 100644
> --- a/repair/agheader.h
> +++ b/repair/agheader.h
> @@ -24,7 +24,6 @@ typedef struct fs_geometry {
> xfs_rfsblock_t sb_dblocks; /* # data blocks */
> xfs_rfsblock_t sb_rblocks; /* # realtime blocks */
> xfs_rtblock_t sb_rextents; /* # realtime extents */
> - uuid_t sb_uuid; /* fs uuid */
> xfs_fsblock_t sb_logstart; /* starting log block # */
> xfs_agblock_t sb_rextsize; /* realtime extent size (blocks )*/
> xfs_agblock_t sb_agblocks; /* # of blocks per ag */
> diff --git a/repair/dinode.c b/repair/dinode.c
> index 179203e..0ea5a9e 100644
> --- a/repair/dinode.c
> +++ b/repair/dinode.c
> @@ -207,9 +207,9 @@ clear_dinode_core(struct xfs_mount *mp, xfs_dinode_t *dinoc, xfs_ino_t ino_num)
> dinoc->di_ino = cpu_to_be64(ino_num);
> }
>
> - if (platform_uuid_compare(&dinoc->di_uuid, &mp->m_sb.sb_uuid)) {
> + if (platform_uuid_compare(&dinoc->di_uuid, &mp->m_sb.sb_meta_uuid)) {
> __dirty_no_modify_ret(dirty);
> - platform_uuid_copy(&dinoc->di_uuid, &mp->m_sb.sb_uuid);
> + platform_uuid_copy(&dinoc->di_uuid, &mp->m_sb.sb_meta_uuid);
> }
>
> for (i = 0; i < sizeof(dinoc->di_pad2)/sizeof(dinoc->di_pad2[0]); i++) {
> @@ -2287,7 +2287,8 @@ _("inode identifier %llu mismatch on inode %" PRIu64 "\n"),
> return 1;
> goto clear_bad_out;
> }
> - if (platform_uuid_compare(&dino->di_uuid, &mp->m_sb.sb_uuid)) {
> + if (platform_uuid_compare(&dino->di_uuid,
> + &mp->m_sb.sb_meta_uuid)) {
> if (!uncertain)
> do_warn(
> _("UUID mismatch on inode %" PRIu64 "\n"), lino);
> diff --git a/repair/phase5.c b/repair/phase5.c
> index 1ce57a1..d40b71d 100644
> --- a/repair/phase5.c
> +++ b/repair/phase5.c
> @@ -1119,7 +1119,7 @@ build_agi(xfs_mount_t *mp, xfs_agnumber_t agno, bt_status_t *btree_curs,
> agi->agi_unlinked[i] = cpu_to_be32(NULLAGINO);
>
> if (xfs_sb_version_hascrc(&mp->m_sb))
> - platform_uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_uuid);
> + platform_uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid);
>
> if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
> agi->agi_free_root = cpu_to_be32(finobt_curs->root);
> @@ -1360,7 +1360,7 @@ build_agf_agfl(xfs_mount_t *mp,
> #endif
>
> if (xfs_sb_version_hascrc(&mp->m_sb))
> - platform_uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_uuid);
> + platform_uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid);
>
> /* initialise the AGFL, then fill it if there are blocks left over. */
> agfl_buf = libxfs_getbuf(mp->m_dev,
> @@ -1374,7 +1374,7 @@ build_agf_agfl(xfs_mount_t *mp,
> if (xfs_sb_version_hascrc(&mp->m_sb)) {
> agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
> agfl->agfl_seqno = cpu_to_be32(agno);
> - platform_uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_uuid);
> + platform_uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid);
> for (i = 0; i < XFS_AGFL_SIZE(mp); i++)
> agfl->agfl_bno[i] = cpu_to_be32(NULLAGBLOCK);
> }
> diff --git a/repair/phase6.c b/repair/phase6.c
> index 7902be9..5148693 100644
> --- a/repair/phase6.c
> +++ b/repair/phase6.c
> @@ -527,7 +527,7 @@ mk_rbmino(xfs_mount_t *mp)
> ip->i_d.di_flags2 = 0;
> ip->i_d.di_ino = mp->m_sb.sb_rbmino;
> memset(&(ip->i_d.di_pad2[0]), 0, sizeof(ip->i_d.di_pad2));
> - platform_uuid_copy(&ip->i_d.di_uuid, &mp->m_sb.sb_uuid);
> + platform_uuid_copy(&ip->i_d.di_uuid, &mp->m_sb.sb_meta_uuid);
> times |= XFS_ICHGTIME_CREATE;
> }
> libxfs_trans_ichgtime(tp, ip, times);
> @@ -783,7 +783,7 @@ mk_rsumino(xfs_mount_t *mp)
> ip->i_d.di_flags2 = 0;
> ip->i_d.di_ino = mp->m_sb.sb_rsumino;
> memset(&(ip->i_d.di_pad2[0]), 0, sizeof(ip->i_d.di_pad2));
> - platform_uuid_copy(&ip->i_d.di_uuid, &mp->m_sb.sb_uuid);
> + platform_uuid_copy(&ip->i_d.di_uuid, &mp->m_sb.sb_meta_uuid);
> times |= XFS_ICHGTIME_CREATE;
> }
> libxfs_trans_ichgtime(tp, ip, times);
> @@ -897,7 +897,7 @@ mk_root_dir(xfs_mount_t *mp)
> ip->i_d.di_flags2 = 0;
> ip->i_d.di_ino = mp->m_sb.sb_rootino;
> memset(&(ip->i_d.di_pad2[0]), 0, sizeof(ip->i_d.di_pad2));
> - platform_uuid_copy(&ip->i_d.di_uuid, &mp->m_sb.sb_uuid);
> + platform_uuid_copy(&ip->i_d.di_uuid, &mp->m_sb.sb_meta_uuid);
> times |= XFS_ICHGTIME_CREATE;
> }
> libxfs_trans_ichgtime(tp, ip, times);
>
> _______________________________________________
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> http://oss.sgi.com/mailman/listinfo/xfs
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