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authorGreg Edwards <gedwards@ddn.com>2017-10-24 11:21:48 -0600
committerJens Axboe <axboe@kernel.dk>2017-11-10 19:55:57 -0700
commit67f2519fe2903c4041c0e94394d14d372fe51399 (patch)
treefc98b82e0148eeb551b38084057a6b2bf2ac1e4e /fs/buffer.c
parent0e78eccc552b6a9e9ce158aee72e95ae41e0e171 (diff)
downloadlinux-67f2519fe2903c4041c0e94394d14d372fe51399.tar.bz2
fs: guard_bio_eod() needs to consider partitions
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") Cc: stable@vger.kernel.org # v4.13 Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Greg Edwards <gedwards@ddn.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/buffer.c')
-rw-r--r--fs/buffer.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/fs/buffer.c b/fs/buffer.c
index bff571dc7bc3..bcabb69e7462 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -3015,8 +3015,16 @@ 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;
+
+ rcu_read_lock();
+ 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);
+ rcu_read_unlock();
- maxsector = get_capacity(bio->bi_disk);
if (!maxsector)
return;