From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Check that the number of mirrors, and the mirror information matches
before deciding to merge layout segments in pNFS/flexfiles.
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
---
fs/nfs/flexfilelayout/flexfilelayout.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
index d37883a2b51f..3221001f2ea1 100644
--- a/fs/nfs/flexfilelayout/flexfilelayout.c
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -283,6 +283,23 @@ static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
}
}
+static bool
+ff_lseg_match_mirrors(struct pnfs_layout_segment *l1,
+ struct pnfs_layout_segment *l2)
+{
+ const struct nfs4_ff_layout_segment *fl1 = FF_LAYOUT_LSEG(l1);
+ const struct nfs4_ff_layout_segment *fl2 = FF_LAYOUT_LSEG(l1);
+ u32 i;
+
+ if (fl1->mirror_array_cnt != fl2->mirror_array_cnt)
+ return false;
+ for (i = 0; i < fl1->mirror_array_cnt; i++) {
+ if (fl1->mirror_array[i] != fl2->mirror_array[i])
+ return false;
+ }
+ return true;
+}
+
static bool
ff_lseg_range_is_after(const struct pnfs_layout_range *l1,
const struct pnfs_layout_range *l2)
@@ -318,6 +335,8 @@ ff_lseg_merge(struct pnfs_layout_segment *new,
new->pls_range.length);
if (new_end < old->pls_range.offset)
return false;
+ if (!ff_lseg_match_mirrors(new, old))
+ return false;
/* Mergeable: copy info from 'old' to 'new' */
if (new_end < old_end)
--
2.25.1
