| Message ID | 7c05a2d1-e9aa-7c5c-0f99-912d29b7c583@redhat.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | [V2] mkfs.xfs: fix ASSERT on too-small device with stripe geometry | expand |
On Mon, Sep 14, 2020 at 02:00:52PM -0500, Eric Sandeen wrote: > When a too-small device is created with stripe geometry, we hit an > assert in align_ag_geometry(): > > # truncate --size=10444800 testfile > # mkfs.xfs -dsu=65536,sw=1 testfile > mkfs.xfs: xfs_mkfs.c:2834: align_ag_geometry: Assertion `cfg->agcount != 0' failed. > > This is because align_ag_geometry() finds that the size of the last > (only) AG is too small, and attempts to trim it off. Obviously 0 > AGs is invalid, and we hit the ASSERT. > > Fix this by skipping the last-ag-trim if there is only one AG, and > add a new test to validate_ag_geometry() which offers a very specific, > clear warning if the device (in dblocks) is smaller than the minimum > allowed AG size. > > Reported-by: Zdenek Kabelac <zkabelac@redhat.com> > Signed-off-by: Eric Sandeen <sandeen@redhat.com> Seems fine to me, Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> --D > --- > > V2: remove stray printf, sorry > > diff --git a/mkfs/xfs_mkfs.c b/mkfs/xfs_mkfs.c > index a687f385..2139aedb 100644 > --- a/mkfs/xfs_mkfs.c > +++ b/mkfs/xfs_mkfs.c > @@ -1038,6 +1038,15 @@ validate_ag_geometry( > uint64_t agsize, > uint64_t agcount) > { > + /* Is this device simply too small? */ > + if (dblocks < XFS_AG_MIN_BLOCKS(blocklog)) { > + fprintf(stderr, > + _("device (%lld blocks) too small, need at least %lld blocks\n"), > + (long long)dblocks, > + (long long)XFS_AG_MIN_BLOCKS(blocklog)); > + usage(); > + } > + > if (agsize < XFS_AG_MIN_BLOCKS(blocklog)) { > fprintf(stderr, > _("agsize (%lld blocks) too small, need at least %lld blocks\n"), > @@ -2827,11 +2836,11 @@ validate: > * and drop the blocks. > */ > if (cfg->dblocks % cfg->agsize != 0 && > + cfg->agcount > 1 && > (cfg->dblocks % cfg->agsize < XFS_AG_MIN_BLOCKS(cfg->blocklog))) { > ASSERT(!cli_opt_set(&dopts, D_AGCOUNT)); > cfg->dblocks = (xfs_rfsblock_t)((cfg->agcount - 1) * cfg->agsize); > cfg->agcount--; > - ASSERT(cfg->agcount != 0); > } > > validate_ag_geometry(cfg->blocklog, cfg->dblocks, > >
diff --git a/mkfs/xfs_mkfs.c b/mkfs/xfs_mkfs.c index a687f385..2139aedb 100644 --- a/mkfs/xfs_mkfs.c +++ b/mkfs/xfs_mkfs.c @@ -1038,6 +1038,15 @@ validate_ag_geometry( uint64_t agsize, uint64_t agcount) { + /* Is this device simply too small? */ + if (dblocks < XFS_AG_MIN_BLOCKS(blocklog)) { + fprintf(stderr, + _("device (%lld blocks) too small, need at least %lld blocks\n"), + (long long)dblocks, + (long long)XFS_AG_MIN_BLOCKS(blocklog)); + usage(); + } + if (agsize < XFS_AG_MIN_BLOCKS(blocklog)) { fprintf(stderr, _("agsize (%lld blocks) too small, need at least %lld blocks\n"), @@ -2827,11 +2836,11 @@ validate: * and drop the blocks. */ if (cfg->dblocks % cfg->agsize != 0 && + cfg->agcount > 1 && (cfg->dblocks % cfg->agsize < XFS_AG_MIN_BLOCKS(cfg->blocklog))) { ASSERT(!cli_opt_set(&dopts, D_AGCOUNT)); cfg->dblocks = (xfs_rfsblock_t)((cfg->agcount - 1) * cfg->agsize); cfg->agcount--; - ASSERT(cfg->agcount != 0); } validate_ag_geometry(cfg->blocklog, cfg->dblocks,
When a too-small device is created with stripe geometry, we hit an assert in align_ag_geometry(): # truncate --size=10444800 testfile # mkfs.xfs -dsu=65536,sw=1 testfile mkfs.xfs: xfs_mkfs.c:2834: align_ag_geometry: Assertion `cfg->agcount != 0' failed. This is because align_ag_geometry() finds that the size of the last (only) AG is too small, and attempts to trim it off. Obviously 0 AGs is invalid, and we hit the ASSERT. Fix this by skipping the last-ag-trim if there is only one AG, and add a new test to validate_ag_geometry() which offers a very specific, clear warning if the device (in dblocks) is smaller than the minimum allowed AG size. Reported-by: Zdenek Kabelac <zkabelac@redhat.com> Signed-off-by: Eric Sandeen <sandeen@redhat.com> --- V2: remove stray printf, sorry