From: Darrick J. Wong <djwong@xxxxxxxxxx>
When iomap is in use for the page cache, the kernel will take care of
all the file data block IO for us, including zeroing of punched ranges
and post-EOF bytes. fuse2fs only needs to do IO for inline data.
Therefore, set the NOBLOCKIO ext2_file flag so that libext2fs will not
do any regular file IO to or from disk blocks at all.
Signed-off-by: "Darrick J. Wong" <djwong@xxxxxxxxxx>
---
misc/fuse2fs.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/misc/fuse2fs.c b/misc/fuse2fs.c
index aeb2b6fbc28401..842ea3a191fa44 100644
--- a/misc/fuse2fs.c
+++ b/misc/fuse2fs.c
@@ -2863,9 +2863,14 @@ static int truncate_helper(struct fuse2fs *ff, ext2_ino_t ino, off_t new_size)
ext2_file_t file;
__u64 old_isize;
errcode_t err;
+ int flags = EXT2_FILE_WRITE;
int ret = 0;
- err = ext2fs_file_open(fs, ino, EXT2_FILE_WRITE, &file);
+ /* the kernel handles all eof zeroing for us in iomap mode */
+ if (iomap_does_fileio(ff))
+ flags |= EXT2_FILE_NOBLOCKIO;
+
+ err = ext2fs_file_open(fs, ino, flags, &file);
if (err)
return translate_error(fs, ino, err);
@@ -2987,6 +2992,9 @@ static int __op_open(struct fuse2fs *ff, const char *path,
file->open_flags |= EXT2_FILE_WRITE;
break;
}
+ /* the kernel handles all block IO for us in iomap mode */
+ if (iomap_does_fileio(ff))
+ file->open_flags |= EXT2_FILE_NOBLOCKIO;
if (fp->flags & O_APPEND) {
/* the kernel doesn't allow truncation of an append-only file */
if (fp->flags & O_TRUNC) {
