From: Darrick J. Wong <djwong@xxxxxxxxxx>
Implement file reads via iomap. Currently only directio is supported.
Signed-off-by: "Darrick J. Wong" <djwong@xxxxxxxxxx>
---
misc/fuse2fs.c | 25 ++++++++++++++++++++++++-
1 file changed, 24 insertions(+), 1 deletion(-)
diff --git a/misc/fuse2fs.c b/misc/fuse2fs.c
index 72b9ec837209ca..209858aeb9307c 100644
--- a/misc/fuse2fs.c
+++ b/misc/fuse2fs.c
@@ -1274,6 +1274,10 @@ static void *op_init(struct fuse_conn_info *conn
goto mount_fail;
}
#endif
+#if defined(HAVE_FUSE_IOMAP) && defined(FUSE_CAP_IOMAP_DIRECTIO)
+ if (fuse2fs_iomap_enabled(ff))
+ fuse_set_feature_flag(conn, FUSE_CAP_IOMAP_DIRECTIO);
+#endif
/*
* If we're mounting in iomap mode, we need to unmount in op_destroy
@@ -5165,7 +5169,26 @@ static int fuse2fs_iomap_begin_read(struct fuse2fs *ff, ext2_ino_t ino,
uint64_t count, uint32_t opflags,
struct fuse_iomap *read_iomap)
{
- return -ENOSYS;
+ errcode_t err;
+
+ if (!(opflags & FUSE_IOMAP_OP_DIRECT))
+ return -ENOSYS;
+
+ /* fall back to slow path for inline data reads */
+ if (inode->i_flags & EXT4_INLINE_DATA_FL)
+ return -ENOSYS;
+
+ /* flush dirty io_channel buffers to disk before iomap reads them */
+ err = io_channel_flush(ff->fs->io);
+ if (err)
+ return translate_error(ff->fs, ino, err);
+
+ if (inode->i_flags & EXT4_EXTENTS_FL)
+ return fuse2fs_iomap_begin_extent(ff, ino, inode, pos, count,
+ opflags, read_iomap);
+
+ return fuse2fs_iomap_begin_indirect(ff, ino, inode, pos, count,
+ opflags, read_iomap);
}
static int fuse2fs_iomap_begin_write(struct fuse2fs *ff, ext2_ino_t ino,
