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OpenCloudOS-Kernel
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generic_file_direct_write(): make use of iov_iter_revert() 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-04-13 14:10:15 -04:00
parent c63ed807d1
commit 639a93a521
1 changed files with 3 additions and 4 deletions
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7
mm/filemap.c
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@ -2704,7 +2704,6 @@ generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from)
ssize_t written;
size_t write_len;
pgoff_t end;
struct iov_iter data;
write_len = iov_iter_count(from);
end = (pos + write_len - 1) >> PAGE_SHIFT;
@ -2733,8 +2732,7 @@ generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from)
}
}
data = *from;
written = mapping->a_ops->direct_IO(iocb, &data);
written = mapping->a_ops->direct_IO(iocb, from);
/*
* Finally, try again to invalidate clean pages which might have been
@ -2751,13 +2749,14 @@ generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from)
if (written > 0) {
pos += written;
iov_iter_advance(from, written);
write_len -= written;
if (pos > i_size_read(inode) && !S_ISBLK(inode->i_mode)) {
i_size_write(inode, pos);
mark_inode_dirty(inode);
}
iocb->ki_pos = pos;
}
iov_iter_revert(from, write_len - iov_iter_count(from));
out:
return written;
}