From: Darrick J. Wong <djwong@xxxxxxxxxx>
Teach the upper level fuse library about the iomap begin and end
operations, and connect it to the lower level. This is needed for
fuse2fs to start using iomap.
Signed-off-by: "Darrick J. Wong" <djwong@xxxxxxxxxx>
---
include/fuse.h | 19 ++++++++++
lib/fuse.c | 107 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 126 insertions(+)
diff --git a/include/fuse.h b/include/fuse.h
index b99004334c99f3..6b25586e768285 100644
--- a/include/fuse.h
+++ b/include/fuse.h
@@ -850,6 +850,25 @@ struct fuse_operations {
* Find next data or hole after the specified offset
*/
off_t (*lseek) (const char *, off_t off, int whence, struct fuse_file_info *);
+
+#if FUSE_USE_VERSION >= FUSE_MAKE_VERSION(3, 18)
+ /**
+ * Send a mapping to the kernel so that a file IO operation can run.
+ */
+ int (*iomap_begin) (const char *path, uint64_t nodeid,
+ uint64_t attr_ino, off_t pos_in,
+ uint64_t length_in, uint32_t opflags_in,
+ struct fuse_iomap *read_iomap_out,
+ struct fuse_iomap *write_iomap_out);
+
+ /**
+ * Respond to the outcome of a previous file mapping operation.
+ */
+ int (*iomap_end) (const char *path, uint64_t nodeid, uint64_t attr_ino,
+ off_t pos_in, uint64_t length_in,
+ uint32_t opflags_in, ssize_t written_in,
+ const struct fuse_iomap *iomap_in);
+#endif /* FUSE_USE_VERSION >= 318 */
};
/** Extra context that may be needed by some filesystems
diff --git a/lib/fuse.c b/lib/fuse.c
index 68b61ce6953d6f..aa4287e0896761 100644
--- a/lib/fuse.c
+++ b/lib/fuse.c
@@ -2737,6 +2737,45 @@ int fuse_fs_chmod(struct fuse_fs *fs, const char *path, mode_t mode,
return fs->op.chmod(path, mode, fi);
}
+static int fuse_fs_iomap_begin(struct fuse_fs *fs, const char *path,
+ fuse_ino_t nodeid, uint64_t attr_ino, off_t pos,
+ uint64_t count, uint32_t opflags,
+ struct fuse_iomap *read_iomap,
+ struct fuse_iomap *write_iomap)
+{
+ fuse_get_context()->private_data = fs->user_data;
+ if (!fs->op.iomap_begin)
+ return -ENOSYS;
+
+ if (fs->debug) {
+ fuse_log(FUSE_LOG_DEBUG,
+ "iomap_begin[%s] nodeid %llu attr_ino %llu pos %llu count %llu opflags 0x%x\n",
+ path, nodeid, attr_ino, pos, count, opflags);
+ }
+
+ return fs->op.iomap_begin(path, nodeid, attr_ino, pos, count, opflags,
+ read_iomap, write_iomap);
+}
+
+static int fuse_fs_iomap_end(struct fuse_fs *fs, const char *path,
+ fuse_ino_t nodeid, uint64_t attr_ino, off_t pos,
+ uint64_t count, uint32_t opflags, ssize_t written,
+ const struct fuse_iomap *iomap)
+{
+ fuse_get_context()->private_data = fs->user_data;
+ if (!fs->op.iomap_end)
+ return 0;
+
+ if (fs->debug) {
+ fuse_log(FUSE_LOG_DEBUG,
+ "iomap_end[%s] nodeid %llu attr_ino %llu pos %llu count %llu opflags 0x%x written %zd\n",
+ path, nodeid, attr_ino, pos, count, opflags, written);
+ }
+
+ return fs->op.iomap_end(path, nodeid, attr_ino, pos, count, opflags,
+ written, iomap);
+}
+
static void fuse_lib_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr,
int valid, struct fuse_file_info *fi)
{
@@ -4361,6 +4400,72 @@ static void fuse_lib_lseek(fuse_req_t req, fuse_ino_t ino, off_t off, int whence
reply_err(req, res);
}
+static void fuse_lib_iomap_begin(fuse_req_t req, fuse_ino_t nodeid,
+ uint64_t attr_ino, off_t pos, uint64_t count,
+ uint32_t opflags)
+{
+ struct fuse *f = req_fuse_prepare(req);
+ struct fuse_iomap read_iomap = {
+ .offset = pos,
+ .length = count,
+ .type = FUSE_IOMAP_TYPE_HOLE,
+ .dev = FUSE_IOMAP_DEV_NULL,
+ .addr = FUSE_IOMAP_NULL_ADDR,
+ };
+ struct fuse_iomap write_iomap = {
+ .offset = pos,
+ .length = count,
+ .type = FUSE_IOMAP_TYPE_PURE_OVERWRITE,
+ .dev = FUSE_IOMAP_DEV_NULL,
+ .addr = FUSE_IOMAP_NULL_ADDR,
+ };
+ struct fuse_intr_data d;
+ char *path;
+ int err;
+
+ err = get_path_nullok(f, nodeid, &path);
+ if (err) {
+ reply_err(req, err);
+ return;
+ }
+
+ fuse_prepare_interrupt(f, req, &d);
+ err = fuse_fs_iomap_begin(f->fs, path, nodeid, attr_ino, pos, count,
+ opflags, &read_iomap, &write_iomap);
+ fuse_finish_interrupt(f, req, &d);
+ free_path(f, nodeid, path);
+ if (err) {
+ reply_err(req, err);
+ return;
+ }
+
+ fuse_reply_iomap_begin(req, &read_iomap, &write_iomap);
+}
+
+static void fuse_lib_iomap_end(fuse_req_t req, fuse_ino_t nodeid,
+ uint64_t attr_ino, off_t pos, uint64_t count,
+ uint32_t opflags, ssize_t written,
+ const struct fuse_iomap *iomap)
+{
+ struct fuse *f = req_fuse_prepare(req);
+ struct fuse_intr_data d;
+ char *path;
+ int err;
+
+ err = get_path_nullok(f, nodeid, &path);
+ if (err) {
+ reply_err(req, err);
+ return;
+ }
+
+ fuse_prepare_interrupt(f, req, &d);
+ err = fuse_fs_iomap_end(f->fs, path, nodeid, attr_ino, pos, count,
+ opflags, written, iomap);
+ fuse_finish_interrupt(f, req, &d);
+ free_path(f, nodeid, path);
+ reply_err(req, err);
+}
+
static int clean_delay(struct fuse *f)
{
/*
@@ -4459,6 +4564,8 @@ static struct fuse_lowlevel_ops fuse_path_ops = {
.fallocate = fuse_lib_fallocate,
.copy_file_range = fuse_lib_copy_file_range,
.lseek = fuse_lib_lseek,
+ .iomap_begin = fuse_lib_iomap_begin,
+ .iomap_end = fuse_lib_iomap_end,
};
int fuse_notify_poll(struct fuse_pollhandle *ph)
