diff options
| -rw-r--r-- | fs/block_dev.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c index a1e09b4fe1ba..ab3a456f6650 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1544,6 +1544,22 @@ ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov, } EXPORT_SYMBOL_GPL(blkdev_aio_write); +static ssize_t blkdev_aio_read(struct kiocb *iocb, const struct iovec *iov, + unsigned long nr_segs, loff_t pos) +{ + struct file *file = iocb->ki_filp; + struct inode *bd_inode = file->f_mapping->host; + loff_t size = i_size_read(bd_inode); + + if (pos >= size) + return 0; + + size -= pos; + if (size < INT_MAX) + nr_segs = iov_shorten((struct iovec *)iov, nr_segs, size); + return generic_file_aio_read(iocb, iov, nr_segs, pos); +} + /* * Try to release a page associated with block device when the system * is under memory pressure. @@ -1574,7 +1590,7 @@ const struct file_operations def_blk_fops = { .llseek = block_llseek, .read = do_sync_read, .write = do_sync_write, - .aio_read = generic_file_aio_read, + .aio_read = blkdev_aio_read, .aio_write = blkdev_aio_write, .mmap = generic_file_mmap, .fsync = blkdev_fsync, |