dm: use i_size_read

Use i_size_read() instead of reading i_size.

If someone changes the size of the device simultaneously, i_size_read
is guaranteed to return a valid value (either the old one or the new one).

i_size can return some intermediate invalid value (on 32-bit computers
with 64-bit i_size, the reads to both halves of i_size can be interleaved
with updates to i_size, resulting in garbage being returned).

Cc: stable@kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

3 files changed, 4 insertions, 3 deletions

diff --git a/drivers/md/dm-exception-store.h b/drivers/md/dm-exception-store.h
index c92701dc5001..2442c8c07898 100644
--- a/drivers/md/dm-exception-store.h
+++ b/drivers/md/dm-exception-store.h
@@ -156,7 +156,7 @@ static inline void dm_consecutive_chunk_count_inc(struct dm_snap_exception *e)
  */
 static inline sector_t get_dev_size(struct block_device *bdev)
 {
-        return bdev->bd_inode->i_size >> SECTOR_SHIFT;
+        return i_size_read(bdev->bd_inode) >> SECTOR_SHIFT;
 }
 
 static inline chunk_t sector_to_chunk(struct dm_exception_store *store,
diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index 6fa8ccf91c70..6352a9ad4446 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -416,7 +416,7 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
                                        bitset_size,
                                        ti->limits.logical_block_size);
 
-                if (buf_size > dev->bdev->bd_inode->i_size) {
+                if (buf_size > i_size_read(dev->bdev->bd_inode)) {
                         DMWARN("log device %s too small: need %llu bytes",
                                 dev->name, (unsigned long long)buf_size);
                         kfree(lc);
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index e9a73bb242b0..0e2210c0c168 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -388,7 +388,8 @@ static void close_dev(struct dm_dev_internal *d, struct mapped_device *md)
 static int check_device_area(struct dm_dev_internal *dd, sector_t start,
                              sector_t len)
 {
-        sector_t dev_size = dd->dm_dev.bdev->bd_inode->i_size >> SECTOR_SHIFT;
+        sector_t dev_size = i_size_read(dd->dm_dev.bdev->bd_inode) >>
+                            SECTOR_SHIFT;
 
         if (!dev_size)
                 return 1;