diff options
| -rw-r--r-- | fs/direct-io.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/fs/direct-io.c b/fs/direct-io.c index 5a674a0c714..1d55e7e6734 100644 --- a/fs/direct-io.c +++ b/fs/direct-io.c @@ -66,6 +66,7 @@ struct dio { struct bio *bio; /* bio under assembly */ struct inode *inode; int rw; + loff_t i_size; /* i_size when submitted */ int lock_type; /* doesn't change */ unsigned blkbits; /* doesn't change */ unsigned blkfactor; /* When we're using an alignment which @@ -230,17 +231,29 @@ static void finished_one_bio(struct dio *dio) spin_lock_irqsave(&dio->bio_lock, flags); if (dio->bio_count == 1) { if (dio->is_async) { + ssize_t transferred; + loff_t offset; + /* * Last reference to the dio is going away. * Drop spinlock and complete the DIO. */ spin_unlock_irqrestore(&dio->bio_lock, flags); - dio_complete(dio, dio->block_in_file << dio->blkbits, - dio->result); + + /* Check for short read case */ + transferred = dio->result; + offset = dio->iocb->ki_pos; + + if ((dio->rw == READ) && + ((offset + transferred) > dio->i_size)) + transferred = dio->i_size - offset; + + dio_complete(dio, offset, transferred); + /* Complete AIO later if falling back to buffered i/o */ if (dio->result == dio->size || ((dio->rw == READ) && dio->result)) { - aio_complete(dio->iocb, dio->result, 0); + aio_complete(dio->iocb, transferred, 0); kfree(dio); return; } else { @@ -951,6 +964,7 @@ direct_io_worker(int rw, struct kiocb *iocb, struct inode *inode, dio->page_errors = 0; dio->result = 0; dio->iocb = iocb; + dio->i_size = i_size_read(inode); /* * BIO completion state. |