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Message-ID: <174787198505.1484996.12562805540320275647.stgit@frogsfrogsfrogs> Date: Wed, 21 May 2025 17:11:53 -0700 From: "Darrick J. Wong" <djwong@...nel.org> To: tytso@....edu Cc: John@...ves.net, linux-ext4@...r.kernel.org, miklos@...redi.hu, joannelkoong@...il.com, bernd@...ernd.com, linux-fsdevel@...r.kernel.org Subject: [PATCH 04/16] fuse2fs: implement directio file reads From: Darrick J. Wong <djwong@...nel.org> Implement file reads via iomap. Currently only directio is supported. Signed-off-by: "Darrick J. Wong" <djwong@...nel.org> --- misc/fuse2fs.c | 26 +++++++++++++++++++++++++- 1 file changed, 25 insertions(+), 1 deletion(-) diff --git a/misc/fuse2fs.c b/misc/fuse2fs.c index 91c0da096bef9c..b1f3002ec8c481 100644 --- a/misc/fuse2fs.c +++ b/misc/fuse2fs.c @@ -1103,6 +1103,11 @@ static void *op_init(struct fuse_conn_info *conn goto mount_fail; } +#if defined(HAVE_FUSE_IOMAP) && defined(FUSE_CAP_IOMAP_DIRECTIO) + if (iomap_enabled(ff)) + fuse_set_feature_flag(conn, FUSE_CAP_IOMAP_DIRECTIO); +#endif + /* Clear the valid flag so that an unclean shutdown forces a fsck */ if (ff->writable) { fs->super->s_mnt_count++; @@ -4942,7 +4947,26 @@ static int fuse_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 extent_iomap_begin(ff, ino, inode, pos, count, opflags, + read_iomap); + + return indirect_iomap_begin(ff, ino, inode, pos, count, opflags, + read_iomap); } static int fuse_iomap_begin_write(struct fuse2fs *ff, ext2_ino_t ino,
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