diff options
| author | Darrick J. Wong <djwong@kernel.org> | 2021-09-01 11:18:43 -0700 |
|---|---|---|
| committer | Darrick J. Wong <djwong@kernel.org> | 2021-10-22 16:41:08 -0700 |
| commit | c5750e66fc0a8af7e9e9a5180bb5dd1c0cb90808 (patch) | |
| tree | f27069170c00700077fe59a7deb7c0b310e8d181 /fs/xfs/libxfs | |
| parent | c700bf855784c9fee4053a4f1b24ad199062795e (diff) | |
xfs: compute rtrmap btree max levels when reflink enabled
Compute the maximum possible height of the realtime rmap btree when
reflink is enabled.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Diffstat (limited to 'fs/xfs/libxfs')
| -rw-r--r-- | fs/xfs/libxfs/xfs_rtrmap_btree.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_rtrmap_btree.c b/fs/xfs/libxfs/xfs_rtrmap_btree.c index eca0211f1c1d..a1584784991e 100644 --- a/fs/xfs/libxfs/xfs_rtrmap_btree.c +++ b/fs/xfs/libxfs/xfs_rtrmap_btree.c @@ -594,9 +594,17 @@ xfs_rtrmapbt_compute_maxlevels( * The realtime rmapbt lives on the data device, which means that its * maximum height is constrained by the size of the data device and * the height required to store one rmap record for each rt block. + * + * On a reflink filesystem, each rt block can have up to 2^32 (per the + * refcount record format) owners, which means that theoretically we + * could face up to 2^96 rmap records. This makes the computation of + * maxlevels based on record count meaningless, so we only consider the + * size of the data device. */ d_maxlevels = xfs_btree_compute_maxlevels_size(dblocks, mp->m_rtrmap_mnr[1]); + if (xfs_has_rtreflink(mp)) + return d_maxlevels + 1; r_maxlevels = xfs_btree_compute_maxlevels(mp->m_rtrmap_mnr, rblocks); /* Add one level to handle the inode root level. */ |