A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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fix ITER_PIPE interaction with direct_IO

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by making sure we call iov_iter_advance() on original
iov_iter even if direct_IO (done on its copy) has returned 0.
It's a no-op for old iov_iter flavours and does the right thing
(== truncation of the stuff we'd allocated, but not filled) in
ITER_PIPE case.  Failures (e.g. -EIO) get caught and dealt with
by cleanup in generic_file_read_iter().

Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Al Viro 2016-10-10 13:26:27 -04:00
commit c3a6902404
3 changed files with 5 additions and 11 deletions
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2
fs/xfs/xfs_file.c
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@ -317,7 +317,7 @@ xfs_file_dio_aio_read(
data = *to;
ret = __blockdev_direct_IO(iocb, inode, target->bt_bdev, &data,
xfs_get_blocks_direct, NULL, NULL, 0);
if (ret > 0) {
if (ret >= 0) {
iocb->ki_pos += ret;
iov_iter_advance(to, ret);
}