[PATCH 2/3] bcachefs: Use our own splice_read implementation

splice_read will read file data to the page cache, to prevent cache
coherency issure from happening, we need to lock ei_pagecache_lock
around it. Therefore, use our own splice_read implementation.

This also solves one deadlock issue, which locks the folio first when
bch2_readahead is invoked from splice_read path, but fail to lock
ei_pagecache_lock, which was already locked by the direct I/O path
or fallocate path, when the DIO path tries to invalidate the page cache,
a deadlock happens.

Signed-off-by: Alan Huang <[email protected]>
---
 fs/bcachefs/fs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/bcachefs/fs.c b/fs/bcachefs/fs.c
index 0425238a83ee..6d8830345538 100644
--- a/fs/bcachefs/fs.c
+++ b/fs/bcachefs/fs.c
@@ -1716,7 +1716,7 @@ static const struct file_operations bch_file_operations = {
 	.mmap		= bch2_mmap,
 	.get_unmapped_area = thp_get_unmapped_area,
 	.fsync		= bch2_fsync,
-	.splice_read	= filemap_splice_read,
+	.splice_read	= bch2_splice_read,
 	.splice_write	= iter_file_splice_write,
 	.fallocate	= bch2_fallocate_dispatch,
 	.unlocked_ioctl = bch2_fs_file_ioctl,
-- 
2.49.0