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authorAl Viro <viro@zeniv.linux.org.uk>2015-04-07 11:35:14 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2015-04-11 22:29:48 -0400
commit7ec7b94a3339756dfbb88234e3e45a428e8c08fb (patch)
treee55fca1c1931e3ddaec1f7fbb3addcc2abaf5bf4
parent5f380c7fa7e01f15ca0816bd241ece9a64a73192 (diff)
downloadlinux-7ec7b94a3339756dfbb88234e3e45a428e8c08fb.tar.gz
blkdev_write_iter: expand generic_file_checks() call in there
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/block_dev.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c
index bcd7f97beab9..897ee0503932 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1595,18 +1595,21 @@ static long block_ioctl(struct file *file, unsigned cmd, unsigned long arg)
ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
struct file *file = iocb->ki_filp;
+ struct inode *bd_inode = file->f_mapping->host;
+ loff_t size = i_size_read(bd_inode);
struct blk_plug plug;
ssize_t ret;
- size_t count = iov_iter_count(from);
- ret = generic_write_checks(file, &iocb->ki_pos, &count, 1);
- if (ret)
- return ret;
+ if (bdev_read_only(I_BDEV(bd_inode)))
+ return -EPERM;
- if (count == 0)
+ if (!iov_iter_count(from))
return 0;
- iov_iter_truncate(from, count);
+ if (iocb->ki_pos >= size)
+ return -ENOSPC;
+
+ iov_iter_truncate(from, size - iocb->ki_pos);
blk_start_plug(&plug);
ret = __generic_file_write_iter(iocb, from);