[PATCH 01/16] fuse2fs: implement bare minimum iomap for file mapping reporting

Darrick J. Wong
2025-05-22T00:11:07Z

Add enough of an iomap implementation that we can do FIEMAP and
SEEK_DATA and SEEK_HOLE.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
---
configure | 47 ++++++
configure.ac | 32 ++++
lib/config.h.in | 3
misc/fuse2fs.c | 453 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
4 files changed, 530 insertions(+), 5 deletions(-)

diff --git a/configure b/configure
index 1f7dbe24ee1ab1..c8b63dd448dca8 100755
--- a/configure
+++ b/configure
@@ -14545,6 +14545,53 @@ elif test -n "$FUSE_LIB"
then
FUSE_USE_VERSION=29
fi
+
+if test "$FUSE_LIB" = "-lfuse3"
+then
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for iomap_begin in libfuse" >&5
+printf %s "checking for iomap_begin in libfuse... " >&6; }
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+
+#define _GNU_SOURCE
+#define _FILE_OFFSET_BITS 64
+#define FUSE_USE_VERSION 318
+#include <fuse.h>
+
+int
+main (void)
+{
+
+struct fuse_operations fs_ops = {
+ .iomap_begin = NULL,
+ .iomap_end = NULL,
+};
+struct fuse_iomap narf = { };
+
+ ;
+ return 0;
+}
+
+_ACEOF
+if ac_fn_c_try_link "$LINENO"
+then :
+ have_fuse_iomap=yes
+ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+printf "%s\n" "yes" >&6; }
+else $as_nop
+ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
+printf "%s\n" "no" >&6; }
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam \
+ conftest$ac_exeext conftest.$ac_ext
+if test "$have_fuse_iomap" = yes; then
+ FUSE_USE_VERSION=318
+
+printf "%s\n" "#define HAVE_FUSE_IOMAP 1" >>confdefs.h
+
+fi
+fi
+
if test -n "$FUSE_USE_VERSION"
then

diff --git a/configure.ac b/configure.ac
index c7f193b4ed06bf..8b12ef3ee542e3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1429,6 +1429,38 @@ elif test -n "$FUSE_LIB"
then
FUSE_USE_VERSION=29
fi
+
+if test "$FUSE_LIB" = "-lfuse3"
+then
+dnl
+dnl see if fuse3 supports iomap
+dnl
+AC_MSG_CHECKING(for iomap_begin in libfuse)
+AC_LINK_IFELSE(
+[ AC_LANG_PROGRAM([[
+#define _GNU_SOURCE
+#define _FILE_OFFSET_BITS 64
+#define FUSE_USE_VERSION 318
+#include <fuse.h>
+ ]], [[
+struct fuse_operations fs_ops = {
+ .iomap_begin = NULL,
+ .iomap_end = NULL,
+};
+struct fuse_iomap narf = { };
+ ]])
+], have_fuse_iomap=yes
+ AC_MSG_RESULT(yes),
+ AC_MSG_RESULT(no))
+if test "$have_fuse_iomap" = yes; then
+ FUSE_USE_VERSION=318
+ AC_DEFINE(HAVE_FUSE_IOMAP, 1, [Define to 1 if fuse supports iomap])
+fi
+fi
+
+dnl
+dnl set FUSE_USE_VERSION now that we've done all the feature tests
+dnl
if test -n "$FUSE_USE_VERSION"
then
AC_DEFINE_UNQUOTED(FUSE_USE_VERSION, $FUSE_USE_VERSION,
diff --git a/lib/config.h.in b/lib/config.h.in
index 6cd9751baab9d1..850c5fa573bcf0 100644
--- a/lib/config.h.in
+++ b/lib/config.h.in
@@ -73,6 +73,9 @@
/* Define to 1 if PR_SET_IO_FLUSHER is present */
#undef HAVE_PR_SET_IO_FLUSHER

+/* Define to 1 if fuse supports iomap */
+#undef HAVE_FUSE_IOMAP
+
/* Define to 1 if you have the Mac OS X function
CFLocaleCopyPreferredLanguages in the CoreFoundation framework. */
#undef HAVE_CFLOCALECOPYPREFERREDLANGUAGES
diff --git a/misc/fuse2fs.c b/misc/fuse2fs.c
index 769bb5babd2738..f9eed078d91152 100644
--- a/misc/fuse2fs.c
+++ b/misc/fuse2fs.c
@@ -79,6 +79,8 @@
#define P_(singular, plural, n) ((n) == 1 ? (singular) : (plural))
#endif

+#define min(x, y) ((x) < (y) ? (y) : (x))
+
#define dbg_printf(fuse2fs, format, ...) \
while ((fuse2fs)->debug) { \
printf("FUSE2FS (%s): " format, (fuse2fs)->shortdev, ##__VA_ARGS__); \
@@ -144,6 +146,14 @@ struct fuse2fs_file_handle {
int open_flags;
};

+#ifdef HAVE_FUSE_IOMAP
+enum fuse2fs_iomap_state {
+ IOMAP_DISABLED,
+ IOMAP_UNKNOWN,
+ IOMAP_ENABLED,
+};
+#endif
+
/* Main program context */
#define FUSE2FS_MAGIC (0xEF53DEADUL)
struct fuse2fs {
@@ -167,6 +177,9 @@ struct fuse2fs {
uint8_t writable;

int blocklog;
+#ifdef HAVE_FUSE_IOMAP
+ enum fuse2fs_iomap_state iomap_state;
+#endif
unsigned int blockmask;
int retcode;
unsigned long offset;
@@ -694,7 +707,7 @@ static errcode_t open_fs(struct fuse2fs *ff, int libext2_flags)
{
char options[128];
int flags = EXT2_FLAG_64BITS | EXT2_FLAG_THREADS | EXT2_FLAG_RW |
- libext2_flags;
+ EXT2_FLAG_WRITE_FULL_SUPER | libext2_flags;
errcode_t err;

snprintf(options, sizeof(options) - 1, "offset=%lu", ff->offset);
@@ -945,6 +958,38 @@ static inline int fuse_set_feature_flag(struct fuse_conn_info *conn,
}
#endif

+#ifdef HAVE_FUSE_IOMAP
+static errcode_t confirm_iomap(struct fuse_conn_info *conn, struct fuse2fs *ff)
+{
+ int is_bdev;
+ errcode_t err;
+
+ switch (ff->iomap_state) {
+ case IOMAP_UNKNOWN:
+ ff->iomap_state = IOMAP_DISABLED;
+ /* fallthrough */;
+ case IOMAP_DISABLED:
+ return 0;
+ case IOMAP_ENABLED:
+ break;
+ }
+
+ err = fs_on_bdev(ff, &is_bdev);
+ if (err)
+ return err;
+
+ /* iomap only works with block devices */
+ if (!is_bdev) {
+ fuse_unset_feature_flag(conn, FUSE_CAP_IOMAP);
+ ff->iomap_state = IOMAP_DISABLED;
+ }
+
+ return 0;
+}
+#else
+# define confirm_iomap(...) (0)
+#endif
+
static void *op_init(struct fuse_conn_info *conn
#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 0)
, struct fuse_config *cfg EXT2FS_ATTR((unused))
@@ -972,6 +1017,12 @@ static void *op_init(struct fuse_conn_info *conn
#ifdef FUSE_CAP_NO_EXPORT_SUPPORT
fuse_set_feature_flag(conn, FUSE_CAP_NO_EXPORT_SUPPORT);
#endif
+#ifdef HAVE_FUSE_IOMAP
+ if (ff->iomap_state != IOMAP_DISABLED &&
+ fuse_set_feature_flag(conn, FUSE_CAP_IOMAP))
+ ff->iomap_state = IOMAP_ENABLED;
+#endif
+
#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 0)
conn->time_gran = 1;
cfg->use_ino = 1;
@@ -989,6 +1040,10 @@ static void *op_init(struct fuse_conn_info *conn
goto mount_fail;
fs = ff->fs;

+ err = confirm_iomap(conn, ff);
+ if (err)
+ goto mount_fail;
+
if (ff->cache_size) {
err = config_fs_cache(ff);
if (err)
@@ -1014,6 +1069,10 @@ static void *op_init(struct fuse_conn_info *conn
err = mount_fs(ff);
if (err)
goto mount_fail;
+ } else {
+ err = confirm_iomap(conn, ff);
+ if (err)
+ goto mount_fail;
}

/* Clear the valid flag so that an unclean shutdown forces a fsck */
@@ -4575,6 +4634,384 @@ static int op_fallocate(const char *path EXT2FS_ATTR((unused)), int mode,
# endif /* SUPPORT_FALLOCATE */
#endif /* FUSE 29 */

+#ifdef HAVE_FUSE_IOMAP
+static void handle_iomap_hole(struct fuse2fs *ff, struct fuse_iomap *iomap,
+ off_t pos, uint64_t count)
+{
+ iomap->dev = FUSE_IOMAP_DEV_FUSEBLK;
+ iomap->addr = FUSE_IOMAP_NULL_ADDR;
+ iomap->offset = pos;
+ iomap->length = count;
+ iomap->type = FUSE_IOMAP_TYPE_HOLE;
+}
+
+#define DEBUG_IOMAP
+#ifdef DEBUG_IOMAP
+# define __DUMP_EXTENT(ff, func, tag, startoff, err, extent) \
+ do { \
+ dbg_printf((ff), \
+ "%s: %s startoff 0x%llx err %ld lblk 0x%llx pblk 0x%llx len 0x%x flags 0x%x\n", \
+ (func), (tag), (startoff), (err), (extent)->e_lblk, \
+ (extent)->e_pblk, (extent)->e_len, \
+ (extent)->e_flags & EXT2_EXTENT_FLAGS_UNINIT); \
+ } while(0)
+# define DUMP_EXTENT(ff, tag, startoff, err, extent) \
+ __DUMP_EXTENT((ff), __func__, (tag), (startoff), (err), (extent))
+#else
+# define __DUMP_EXTENT(...) ((void)0)
+# define DUMP_EXTENT(...) ((void)0)
+#endif
+
+static inline errcode_t __get_mapping_at(struct fuse2fs *ff,
+ ext2_extent_handle_t handle,
+ blk64_t startoff,
+ struct ext2fs_extent *bmap,
+ const char *func)
+{
+ errcode_t err;
+
+ /*
+ * Find the file mapping at startoff. We don't check the return value
+ * of _goto because _get will error out if _goto failed. There's a
+ * subtlety to the outcome of _goto when startoff falls in a sparse
+ * hole however:
+ *
+ * Most of the time, _goto points the cursor at the mapping whose lblk
+ * is just to the left of startoff. The mapping may or may not overlap
+ * startoff; this is ok. In other words, the tree lookup behaves as if
+ * we asked it to use a less than or equals comparison.
+ *
+ * However, if startoff is to the left of the first mapping in the
+ * extent tree, _goto points the cursor at that first mapping because
+ * it doesn't know how to deal with this situation. In this case,
+ * the tree lookup behaves as if we asked it to use a greater than
+ * or equals comparison.
+ *
+ * Note: If _get() returns 'no current node', that means that there
+ * aren't any mappings at all.
+ */
+ ext2fs_extent_goto(handle, startoff);
+ err = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT, bmap);
+ __DUMP_EXTENT(ff, func, "lookup", startoff, err, bmap);
+ if (err == EXT2_ET_NO_CURRENT_NODE)
+ err = EXT2_ET_EXTENT_NOT_FOUND;
+ return err;
+}
+
+static inline errcode_t __get_next_mapping(struct fuse2fs *ff,
+ ext2_extent_handle_t handle,
+ blk64_t startoff,
+ struct ext2fs_extent *bmap,
+ const char *func)
+{
+ struct ext2fs_extent newex, errex;
+ errcode_t err;
+
+ err = ext2fs_extent_get(handle, EXT2_EXTENT_NEXT_LEAF, &newex);
+ DUMP_EXTENT(ff, "NEXT", startoff, err, &newex);
+ if (err == EXT2_ET_EXTENT_NO_NEXT)
+ return EXT2_ET_EXTENT_NOT_FOUND;
+ if (err)
+ return err;
+
+ /*
+ * Try to get the next leaf mapping. There's a weird and longstanding
+ * "feature" of EXT2_EXTENT_NEXT_LEAF where walking off the end of the
+ * mapping recordset causes it to wrap around to the beginning of the
+ * extent map and we end up with a mapping to the left of the one that
+ * was passed in.
+ *
+ * However, a corrupt extent tree could also have such a record. The
+ * only way to be sure is to retrieve the mapping for the extreme right
+ * edge of the tree and compare it to the mapping that the caller gave
+ * us. If they match, then we've hit the end. If not, something is
+ * corrupt in the ondisk metadata.
+ */
+ if (newex.e_lblk <= bmap->e_lblk + bmap->e_len) {
+ err = __get_mapping_at(ff, handle, ~0U, &errex, func);
+ if (err)
+ return err;
+
+ if (memcmp(bmap, &errex, sizeof(errex)) != 0)
+ return EXT2_ET_INODE_CORRUPTED;
+
+ return EXT2_ET_EXTENT_NOT_FOUND;
+ }
+
+ *bmap = newex;
+ return 0;
+}
+
+#define get_mapping_at(ff, handle, startoff, bmap) \
+ __get_mapping_at((ff), (handle), (startoff), (bmap), __func__)
+#define get_next_mapping(ff, handle, startoff, bmap) \
+ __get_next_mapping((ff), (handle), (startoff), (bmap), __func__)
+
+static errcode_t extent_iomap_begin(struct fuse2fs *ff, uint64_t ino,
+ struct ext2_inode_large *inode,
+ off_t pos, uint64_t count,
+ uint32_t opflags, struct fuse_iomap *iomap)
+{
+ ext2_extent_handle_t handle;
+ struct ext2fs_extent extent;
+ ext2_filsys fs = ff->fs;
+ const blk64_t startoff = FUSE2FS_B_TO_FSBT(ff, pos);
+ errcode_t err;
+ int ret = 0;
+
+ err = ext2fs_extent_open2(fs, ino, EXT2_INODE(inode), &handle);
+ if (err)
+ return translate_error(fs, ino, err);
+
+ err = get_mapping_at(ff, handle, startoff, &extent);
+ if (err == EXT2_ET_EXTENT_NOT_FOUND) {
+ /* No mappings at all; the whole range is a hole. */
+ handle_iomap_hole(ff, iomap, pos, count);
+ goto out_handle;
+ }
+ if (err) {
+ ret = translate_error(fs, ino, err);
+ goto out_handle;
+ }
+
+ if (startoff < extent.e_lblk) {
+ /*
+ * Mapping starts to the right of the current position.
+ * Synthesize a hole going to that next extent.
+ */
+ handle_iomap_hole(ff, iomap, FUSE2FS_FSB_TO_B(ff, startoff),
+ FUSE2FS_FSB_TO_B(ff, extent.e_lblk - startoff));
+ goto out_handle;
+ }
+
+ if (startoff >= extent.e_lblk + extent.e_len) {
+ /*
+ * Mapping ends to the left of the current position. Try to
+ * find the next mapping. If there is no next mapping, the
+ * whole range is in a hole.
+ */
+ err = get_next_mapping(ff, handle, startoff, &extent);
+ if (err == EXT2_ET_EXTENT_NOT_FOUND) {
+ handle_iomap_hole(ff, iomap, pos, count);
+ goto out_handle;
+ }
+
+ /*
+ * If the new mapping starts to the right of startoff, there's
+ * a hole from startoff to the start of the new mapping.
+ */
+ if (startoff < extent.e_lblk) {
+ handle_iomap_hole(ff, iomap,
+ FUSE2FS_FSB_TO_B(ff, startoff),
+ FUSE2FS_FSB_TO_B(ff, extent.e_lblk - startoff));
+ goto out_handle;
+ }
+
+ /*
+ * The new mapping starts at startoff. Something weird
+ * happened in the extent tree lookup, but we found a valid
+ * mapping so we'll run with it.
+ */
+ }
+
+ /* Mapping overlaps startoff, report this. */
+ iomap->dev = FUSE_IOMAP_DEV_FUSEBLK;
+ iomap->addr = FUSE2FS_FSB_TO_B(ff, extent.e_pblk);
+ iomap->offset = FUSE2FS_FSB_TO_B(ff, extent.e_lblk);
+ iomap->length = FUSE2FS_FSB_TO_B(ff, extent.e_len);
+ if (extent.e_flags & EXT2_EXTENT_FLAGS_UNINIT)
+ iomap->type = FUSE_IOMAP_TYPE_UNWRITTEN;
+ else
+ iomap->type = FUSE_IOMAP_TYPE_MAPPED;
+
+out_handle:
+ ext2fs_extent_free(handle);
+ return ret;
+}
+
+static int indirect_iomap_begin(struct fuse2fs *ff, uint64_t ino,
+ struct ext2_inode_large *inode, off_t pos,
+ uint64_t count, uint32_t opflags,
+ struct fuse_iomap *iomap)
+{
+ ext2_filsys fs = ff->fs;
+ blk64_t startoff = FUSE2FS_B_TO_FSBT(ff, pos);
+ uint64_t real_count = min(count, 131072);
+ const blk64_t endoff = FUSE2FS_B_TO_FSB(ff, pos + real_count);
+ blk64_t startblock;
+ errcode_t err;
+
+ err = ext2fs_bmap2(fs, ino, EXT2_INODE(inode), NULL, 0, startoff, NULL,
+ &startblock);
+ if (err)
+ return translate_error(fs, ino, err);
+
+ iomap->dev = FUSE_IOMAP_DEV_FUSEBLK;
+ iomap->offset = pos;
+ iomap->flags |= FUSE_IOMAP_F_MERGED;
+ if (startblock) {
+ iomap->addr = FUSE2FS_FSB_TO_B(ff, startblock);
+ iomap->type = FUSE_IOMAP_TYPE_MAPPED;
+ } else {
+ iomap->addr = FUSE_IOMAP_NULL_ADDR;
+ iomap->type = FUSE_IOMAP_TYPE_HOLE;
+ }
+ iomap->length = fs->blocksize;
+
+ /* See how long the mapping goes for. */
+ for (startoff++; startoff < endoff; startoff++) {
+ blk64_t prev_startblock = startblock;
+
+ err = ext2fs_bmap2(fs, ino, EXT2_INODE(inode), NULL, 0,
+ startoff, NULL, &startblock);
+ if (err)
+ break;
+
+ if (iomap->type == FUSE_IOMAP_TYPE_MAPPED) {
+ if (startblock == prev_startblock + 1)
+ iomap->length += fs->blocksize;
+ else
+ break;
+ } else {
+ if (startblock != 0)
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static int inline_iomap_begin(struct fuse2fs *ff, off_t pos, uint64_t count,
+ struct fuse_iomap *iomap)
+{
+ iomap->dev = FUSE_IOMAP_DEV_FUSEBLK;
+ iomap->addr = FUSE_IOMAP_NULL_ADDR;
+ iomap->offset = pos;
+ iomap->length = count;
+ iomap->type = FUSE_IOMAP_TYPE_INLINE;
+
+ return 0;
+}
+
+static int fuse_iomap_begin_report(struct fuse2fs *ff, ext2_ino_t ino,
+ struct ext2_inode_large *inode,
+ off_t pos, uint64_t count, uint32_t opflags,
+ struct fuse_iomap *read_iomap)
+{
+ if (inode->i_flags & EXT4_INLINE_DATA_FL)
+ return inline_iomap_begin(ff, pos, count, read_iomap);
+
+ 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_read(struct fuse2fs *ff, ext2_ino_t ino,
+ struct ext2_inode_large *inode, off_t pos,
+ uint64_t count, uint32_t opflags,
+ struct fuse_iomap *read_iomap)
+{
+ return -ENOSYS;
+}
+
+static int fuse_iomap_begin_write(struct fuse2fs *ff, ext2_ino_t ino,
+ struct ext2_inode_large *inode, off_t pos,
+ uint64_t count, uint32_t opflags,
+ struct fuse_iomap *read_iomap)
+{
+ return -ENOSYS;
+}
+
+static int op_iomap_begin(const char *path, uint64_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)
+{
+ struct fuse_context *ctxt = fuse_get_context();
+ struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
+ struct ext2_inode_large inode;
+ ext2_filsys fs;
+ errcode_t err;
+ int ret = 0;
+
+ FUSE2FS_CHECK_CONTEXT(ff);
+ fs = ff->fs;
+
+ pthread_mutex_lock(&ff->bfl);
+
+ dbg_printf(ff,
+ "%s: path=%s nodeid=%llu attr_ino=%llu pos=0x%llx count=0x%llx opflags=0x%x\n",
+ __func__, path,
+ (unsigned long long)nodeid,
+ (unsigned long long)attr_ino,
+ (unsigned long long)pos,
+ (unsigned long long)count,
+ opflags);
+
+ err = fuse2fs_read_inode(fs, attr_ino, &inode);
+ if (err) {
+ ret = translate_error(fs, attr_ino, err);
+ goto out_unlock;
+ }
+
+ if (opflags & FUSE_IOMAP_OP_REPORT)
+ ret = fuse_iomap_begin_report(ff, attr_ino, &inode, pos, count,
+ opflags, read_iomap);
+ else if (opflags & (FUSE_IOMAP_OP_WRITE | FUSE_IOMAP_OP_ZERO))
+ ret = fuse_iomap_begin_write(ff, attr_ino, &inode, pos, count,
+ opflags, read_iomap);
+ else
+ ret = fuse_iomap_begin_read(ff, attr_ino, &inode, pos, count,
+ opflags, read_iomap);
+ if (ret)
+ goto out_unlock;
+
+ dbg_printf(ff, "%s: nodeid=%llu attr_ino=%llu pos=0x%llx -> addr=0x%llx offset=0x%llx length=0x%llx type=%u\n",
+ __func__,
+ (unsigned long long)nodeid,
+ (unsigned long long)attr_ino,
+ (unsigned long long)pos,
+ (unsigned long long)read_iomap->addr,
+ (unsigned long long)read_iomap->offset,
+ (unsigned long long)read_iomap->length,
+ read_iomap->type);
+
+out_unlock:
+ if (ret < 0)
+ dbg_printf(ff, "%s: libfuse ret=%d\n", __func__, ret);
+ pthread_mutex_unlock(&ff->bfl);
+ return ret;
+}
+
+static int op_iomap_end(const char *path, uint64_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_context *ctxt = fuse_get_context();
+ struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
+
+ FUSE2FS_CHECK_CONTEXT(ff);
+
+ pthread_mutex_lock(&ff->bfl);
+ dbg_printf(ff,
+ "%s: path=%s nodeid=%llu attr_ino=%llu pos=0x%llx count=0x%llx opflags=0x%x written=0x%zx mapflags 0x%x\n",
+ __func__, path,
+ (unsigned long long)nodeid,
+ (unsigned long long)attr_ino,
+ (unsigned long long)pos,
+ (unsigned long long)count,
+ opflags,
+ written,
+ iomap->flags);
+ pthread_mutex_unlock(&ff->bfl);
+
+ return 0;
+}
+#endif /* HAVE_FUSE_IOMAP */
+
static struct fuse_operations fs_ops = {
.init = op_init,
.destroy = op_destroy,
@@ -4635,6 +5072,10 @@ static struct fuse_operations fs_ops = {
.fallocate = op_fallocate,
# endif
#endif
+#ifdef HAVE_FUSE_IOMAP
+ .iomap_begin = op_iomap_begin,
+ .iomap_end = op_iomap_end,
+#endif /* HAVE_FUSE_IOMAP */
};

static int get_random_bytes(void *p, size_t sz)
@@ -4840,7 +5281,12 @@ static void fuse2fs_com_err_proc(const char *whoami, errcode_t code,
int main(int argc, char *argv[])
{
struct fuse_args args = FUSE_ARGS_INIT(argc, argv);
- struct fuse2fs fctx;
+ struct fuse2fs fctx = {
+ .magic = FUSE2FS_MAGIC,
+#ifdef HAVE_FUSE_IOMAP
+ .iomap_state = IOMAP_UNKNOWN,
+#endif
+ };
errcode_t err;
FILE *orig_stderr = stderr;
char *logfile;
@@ -4849,9 +5295,6 @@ int main(int argc, char *argv[])
int is_bdev;
int ret = 0;

- memset(&fctx, 0, sizeof(fctx));
- fctx.magic = FUSE2FS_MAGIC;
-
fuse_opt_parse(&args, &fctx, fuse2fs_opts, fuse2fs_opt_proc);
if (fctx.device == NULL) {
fprintf(stderr, "Missing ext4 device/image\n");