guard_bio_eod() needs to look at the partition capacity, not just the
capacity of the whole device, when determining if truncation is
necessary.
[ 60.268688] attempt to access beyond end of device
[ 60.268690] unknown-block(9,1): rw=0, want=67103509, limit=67103506
[ 60.268693] buffer_io_error: 2 callbacks suppressed
[ 60.268696] Buffer I/O error on dev md1p7, logical block 4524305, async page read
Fixes: 74d46992e0d9 ("block: replace bi_bdev with a gendisk pointer and partitions index")
Signed-off-by: Greg Edwards <gedwards@xxxxxxx>
---
fs/buffer.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index 170df856bdb9..989d3b085efe 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -3055,8 +3055,15 @@ void guard_bio_eod(int op, struct bio *bio)
sector_t maxsector;
struct bio_vec *bvec = &bio->bi_io_vec[bio->bi_vcnt - 1];
unsigned truncated_bytes;
+ struct hd_struct *part;
+
+ part = disk_get_part(bio->bi_disk, bio->bi_partno);
+ if (part)
+ maxsector = part_nr_sects_read(part);
+ else
+ maxsector = get_capacity(bio->bi_disk);
+ disk_put_part(part);
- maxsector = get_capacity(bio->bi_disk);
if (!maxsector)
return;
--
2.13.6
