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| author | Mikulas Patocka <mpatocka@redhat.com> | 2009-06-22 10:12:14 +0100 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2009-06-22 10:12:14 +0100 |
| commit | 5657e8fa45cf230df278040c420fb80e06309d8f (patch) | |
| tree | 7817e1bd6c9b721be85fe54a1aec6ef971d7d96b /drivers/md/dm-exception-store.h | |
| parent | 8cbeb67ad50f7d68e5e83be2cb2284de8f9c03b5 (diff) | |
| download | linux-5657e8fa45cf230df278040c420fb80e06309d8f.tar.bz2 | |
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>
Diffstat (limited to 'drivers/md/dm-exception-store.h')
| -rw-r--r-- | drivers/md/dm-exception-store.h | 2 |
1 files changed, 1 insertions, 1 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, |