[PATCH 02/21] NFSv4/flexfiles: Use the full 64-bit offset for read DS selection

The read data-server selection helpers declared their offset parameter
as u32, truncating the file offset before nfs4_ff_layout_calc_dss_id()
computes the stripe index.  For striped reads at offsets >= 4 GiB this
probes DS availability and sizes coalescing against the wrong stripe's
data server; the read itself recomputes dss_id from the full offset, so
data is not corrupted.  The write path already uses the full offset.

Widen the offset parameter to u64 in the five read-selection helpers.

Fixes: 4934ccbeaed3 ("NFSv4/flexfiles: Read path updates for striped layouts")
Cc: [email protected]
Assisted-by: Claude:claude-opus-4-8
Signed-off-by: Benjamin Coddington <bcodding-F/[email protected]>
---
 fs/nfs/flexfilelayout/flexfilelayout.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
index c4aa995026f6..cce56faa8b70 100644
--- a/fs/nfs/flexfilelayout/flexfilelayout.c
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -878,7 +878,7 @@ ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, u32 idx, u32 dss_i
 static struct nfs4_pnfs_ds *
 ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg,
 			     u32 start_idx, u32 *best_idx,
-			     u32 offset, u32 *dss_id,
+			     u64 offset, u32 *dss_id,
 			     bool check_device)
 {
 	struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
@@ -914,7 +914,7 @@ ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg,
 static struct nfs4_pnfs_ds *
 ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg,
 				 u32 start_idx, u32 *best_idx,
-				 u32 offset, u32 *dss_id)
+				 u64 offset, u32 *dss_id)
 {
 	return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx,
 					    offset, dss_id, false);
@@ -923,7 +923,7 @@ ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg,
 static struct nfs4_pnfs_ds *
 ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg,
 				   u32 start_idx, u32 *best_idx,
-				   u32 offset, u32 *dss_id)
+				   u64 offset, u32 *dss_id)
 {
 	return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx,
 					    offset, dss_id, true);
@@ -932,7 +932,7 @@ ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg,
 static struct nfs4_pnfs_ds *
 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
 				  u32 start_idx, u32 *best_idx,
-				  u32 offset, u32 *dss_id)
+				  u64 offset, u32 *dss_id)
 {
 	struct nfs4_pnfs_ds *ds;
 
@@ -947,7 +947,7 @@ ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
 static struct nfs4_pnfs_ds *
 ff_layout_get_ds_for_read(struct nfs_pageio_descriptor *pgio,
 			  u32 *best_idx,
-			  u32 offset,
+			  u64 offset,
 			  u32 *dss_id)
 {
 	struct pnfs_layout_segment *lseg = pgio->pg_lseg;
-- 
2.53.0