From: Taotao Chen <chentaotao@xxxxxxxxxxxxxx>
Set FOP_DONTCACHE in ext4_file_operations to declare support for
uncached buffered I/O.
To handle this flag, add processing for IOCB_DONTCACHE in
ext4_write_begin() and ext4_da_write_begin() by passing FGP_DONTCACHE
to page cache lookups.
Part of a series refactoring address_space_operations write_begin and
write_end callbacks to use struct kiocb for passing write context and
flags.
Signed-off-by: Taotao Chen <chentaotao@xxxxxxxxxxxxxx>
---
fs/ext4/file.c | 3 ++-
fs/ext4/inode.c | 6 ++++++
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 21df81347147..274b41a476c8 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -977,7 +977,8 @@ const struct file_operations ext4_file_operations = {
.splice_write = iter_file_splice_write,
.fallocate = ext4_fallocate,
.fop_flags = FOP_MMAP_SYNC | FOP_BUFFER_RASYNC |
- FOP_DIO_PARALLEL_WRITE,
+ FOP_DIO_PARALLEL_WRITE |
+ FOP_DONTCACHE,
};
const struct inode_operations ext4_file_inode_operations = {
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 08c10200d6fe..639e2e231c4b 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1270,6 +1270,9 @@ static int ext4_write_begin(const struct kiocb *iocb,
if (unlikely(ret))
return ret;
+ if (iocb->ki_flags & IOCB_DONTCACHE)
+ fgp |= FGP_DONTCACHE;
+
trace_ext4_write_begin(inode, pos, len);
/*
* Reserve one block more for addition to orphan list in case
@@ -3068,6 +3071,9 @@ static int ext4_da_write_begin(const struct kiocb *iocb,
return 0;
}
+ if (iocb->ki_flags & IOCB_DONTCACHE)
+ fgp |= FGP_DONTCACHE;
+
retry:
fgp |= fgf_set_order(len);
folio = __filemap_get_folio(mapping, index, fgp,
--
2.34.1
