ext4: Add support for blocksize < pagesize in dioread_nolock
This patch adds the support for blocksize < pagesize for
dioread_nolock feature.
Since in case of blocksize < pagesize, we can have multiple
small buffers of page as unwritten extents, we need to
maintain a vector of these unwritten extents which needs
the conversion after the IO is complete. Thus, we maintain
a list of tuple <offset, size> pair (io_end_vec) for this &
traverse this list to do the unwritten to written conversion.
Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
Link: https://lore.kernel.org/r/20191016073711.4141-5-riteshh@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 731e67c..cf6c5f6 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -5005,6 +5005,7 @@ int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
int ext4_convert_unwritten_io_end_vec(handle_t *handle, ext4_io_end_t *io_end)
{
int ret, err = 0;
+ struct ext4_io_end_vec *io_end_vec;
/*
* This is somewhat ugly but the idea is clear: When transaction is
@@ -5018,8 +5019,14 @@ int ext4_convert_unwritten_io_end_vec(handle_t *handle, ext4_io_end_t *io_end)
return PTR_ERR(handle);
}
- ret = ext4_convert_unwritten_extents(handle, io_end->inode,
- io_end->offset, io_end->size);
+ list_for_each_entry(io_end_vec, &io_end->list_vec, list) {
+ ret = ext4_convert_unwritten_extents(handle, io_end->inode,
+ io_end_vec->offset,
+ io_end_vec->size);
+ if (ret)
+ break;
+ }
+
if (handle)
err = ext4_journal_stop(handle);