Commit 4db96b71 authored by Akinobu Mita's avatar Akinobu Mita Committed by Linus Torvalds

vfs: guard end of device for mpage interface

Add guard_bio_eod() check for mpage code in order to allow us to do IO
even on the odd last sectors of a device, even if the block size is some
multiple of the physical sector size.

Using mpage_readpages() for block device requires this guard check.
Signed-off-by: default avatarAkinobu Mita <>
Cc: Jens Axboe <>
Cc: Alexander Viro <>
Cc: Jeff Moyer <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 59d43914
......@@ -2966,7 +2966,7 @@ static void end_bio_bh_io_sync(struct bio *bio, int err)
* errors, this only handles the "we need to be able to
* do IO at the final sector" case.
static void guard_bio_eod(int rw, struct bio *bio)
void guard_bio_eod(int rw, struct bio *bio)
sector_t maxsector;
struct bio_vec *bvec = &bio->bi_io_vec[bio->bi_vcnt - 1];
......@@ -34,6 +34,11 @@ static inline int __sync_blockdev(struct block_device *bdev, int wait)
* buffer.c
extern void guard_bio_eod(int rw, struct bio *bio);
* char_dev.c
......@@ -28,6 +28,7 @@
#include <linux/backing-dev.h>
#include <linux/pagevec.h>
#include <linux/cleancache.h>
#include "internal.h"
* I/O completion handler for multipage BIOs.
......@@ -57,6 +58,7 @@ static void mpage_end_io(struct bio *bio, int err)
static struct bio *mpage_bio_submit(int rw, struct bio *bio)
bio->bi_end_io = mpage_end_io;
guard_bio_eod(rw, bio);
submit_bio(rw, bio);
return NULL;
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