[PATCH 1/2] fuse2fs: implement freeze and shutdown requests
From: "Darrick J. Wong" <djwong@kernel.org>
Date: 2025-10-29 01:13:07
Also in:
linux-ext4
Subsystem:
the rest · Maintainer:
Linus Torvalds
From: Darrick J. Wong <djwong@kernel.org> Handle freezing and shutting down the filesystem if requested. Signed-off-by: "Darrick J. Wong" <djwong@kernel.org> --- fuse4fs/fuse4fs.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++++++++ misc/fuse2fs.c | 84 +++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 175 insertions(+)
diff --git a/fuse4fs/fuse4fs.c b/fuse4fs/fuse4fs.c
index 544ad9ecb06d45..26b9c6340b73a1 100644
--- a/fuse4fs/fuse4fs.c
+++ b/fuse4fs/fuse4fs.c@@ -228,6 +228,7 @@ struct fuse4fs_file_handle { enum fuse4fs_opstate { F4OP_READONLY, + F4OP_WRITABLE_FROZEN, F4OP_WRITABLE, F4OP_SHUTDOWN, };
@@ -6153,6 +6154,91 @@ static void op_fallocate(fuse_req_t req, fuse_ino_t fino EXT2FS_ATTR((unused)), } #endif /* SUPPORT_FALLOCATE */ +#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 99) +static void op_freezefs(fuse_req_t req, fuse_ino_t ino, uint64_t unlinked) +{ + struct fuse4fs *ff = fuse4fs_get(req); + ext2_filsys fs; + errcode_t err; + int ret = 0; + + FUSE4FS_CHECK_CONTEXT(req); + fs = fuse4fs_start(ff); + + if (ff->opstate == F4OP_WRITABLE) { + if (fs->super->s_error_count) + fs->super->s_state |= EXT2_ERROR_FS; + else if (!unlinked) + fs->super->s_state |= EXT2_VALID_FS; + ext2fs_mark_super_dirty(fs); + err = ext2fs_set_gdt_csum(fs); + if (err) { + ret = translate_error(fs, 0, err); + goto out_unlock; + } + + err = ext2fs_flush2(fs, 0); + if (err) { + ret = translate_error(fs, 0, err); + goto out_unlock; + } + + ff->opstate = F4OP_WRITABLE_FROZEN; + } + +out_unlock: + fs->super->s_state &= ~EXT2_VALID_FS; + fuse4fs_finish(ff, ret); + fuse_reply_err(req, -ret); +} + +static void op_unfreezefs(fuse_req_t req, fuse_ino_t ino) +{ + struct fuse4fs *ff = fuse4fs_get(req); + ext2_filsys fs; + errcode_t err; + int ret = 0; + + FUSE4FS_CHECK_CONTEXT(req); + fs = fuse4fs_start(ff); + + if (ff->opstate == F4OP_WRITABLE_FROZEN) { + if (fs->super->s_error_count) + fs->super->s_state |= EXT2_ERROR_FS; + fs->super->s_state &= ~EXT2_VALID_FS; + ext2fs_mark_super_dirty(fs); + err = ext2fs_set_gdt_csum(fs); + if (err) { + ret = translate_error(fs, 0, err); + goto out_unlock; + } + + err = ext2fs_flush2(fs, 0); + if (err) { + ret = translate_error(fs, 0, err); + goto out_unlock; + } + + ff->opstate = F4OP_WRITABLE; + } + +out_unlock: + fuse4fs_finish(ff, ret); + fuse_reply_err(req, -ret); +} + +static void op_shutdownfs(fuse_req_t req, fuse_ino_t ino, uint64_t flags) +{ + const struct fuse_ctx *ctxt = fuse_req_ctx(req); + struct fuse4fs *ff = fuse4fs_get(req); + int ret; + + ret = ioctl_shutdown(ff, ctxt, NULL, NULL, 0); + + fuse_reply_err(req, -ret); +} +#endif + #ifdef HAVE_FUSE_IOMAP static void fuse4fs_iomap_hole(struct fuse4fs *ff, struct fuse_file_iomap *iomap, off_t pos, uint64_t count)
@@ -7441,6 +7527,11 @@ static struct fuse_lowlevel_ops fs_ops = { #if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 18) .statx = op_statx, #endif +#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 99) + .freezefs = op_freezefs, + .unfreezefs = op_unfreezefs, + .shutdownfs = op_shutdownfs, +#endif #ifdef HAVE_FUSE_IOMAP .iomap_begin = op_iomap_begin, .iomap_end = op_iomap_end,
diff --git a/misc/fuse2fs.c b/misc/fuse2fs.c
index e6853a9be7dd03..763e1386bb54c8 100644
--- a/misc/fuse2fs.c
+++ b/misc/fuse2fs.c@@ -222,6 +222,7 @@ struct fuse2fs_file_handle { enum fuse2fs_opstate { F2OP_READONLY, + F2OP_WRITABLE_FROZEN, F2OP_WRITABLE, F2OP_SHUTDOWN, };
@@ -5687,6 +5688,86 @@ static int op_fallocate(const char *path EXT2FS_ATTR((unused)), int mode, } #endif /* SUPPORT_FALLOCATE */ +#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 99) +static int op_freezefs(const char *path, uint64_t unlinked) +{ + struct fuse2fs *ff = fuse2fs_get(); + ext2_filsys fs; + errcode_t err; + int ret = 0; + + FUSE2FS_CHECK_CONTEXT(ff); + fs = fuse2fs_start(ff); + + if (ff->opstate == F2OP_WRITABLE) { + if (fs->super->s_error_count) + fs->super->s_state |= EXT2_ERROR_FS; + else if (!unlinked) + fs->super->s_state |= EXT2_VALID_FS; + ext2fs_mark_super_dirty(fs); + err = ext2fs_set_gdt_csum(fs); + if (err) { + ret = translate_error(fs, 0, err); + goto out_unlock; + } + + err = ext2fs_flush2(fs, 0); + if (err) { + ret = translate_error(fs, 0, err); + goto out_unlock; + } + + ff->opstate = F2OP_WRITABLE_FROZEN; + } + +out_unlock: + fs->super->s_state &= ~EXT2_VALID_FS; + fuse2fs_finish(ff, ret); + return ret; +} + +static int op_unfreezefs(const char *path) +{ + struct fuse2fs *ff = fuse2fs_get(); + ext2_filsys fs; + errcode_t err; + int ret = 0; + + FUSE2FS_CHECK_CONTEXT(ff); + fs = fuse2fs_start(ff); + + if (ff->opstate == F2OP_WRITABLE_FROZEN) { + if (fs->super->s_error_count) + fs->super->s_state |= EXT2_ERROR_FS; + ext2fs_mark_super_dirty(fs); + err = ext2fs_set_gdt_csum(fs); + if (err) { + ret = translate_error(fs, 0, err); + goto out_unlock; + } + + err = ext2fs_flush2(fs, 0); + if (err) { + ret = translate_error(fs, 0, err); + goto out_unlock; + } + + ff->opstate = F2OP_WRITABLE; + } + +out_unlock: + fuse2fs_finish(ff, ret); + return ret; +} + +static int op_shutdownfs(const char *path, uint64_t flags) +{ + struct fuse2fs *ff = fuse2fs_get(); + + return ioctl_shutdown(ff, NULL, NULL); +} +#endif + #ifdef HAVE_FUSE_IOMAP static void fuse2fs_iomap_hole(struct fuse2fs *ff, struct fuse_file_iomap *iomap, off_t pos, uint64_t count)
@@ -6967,6 +7048,9 @@ static struct fuse_operations fs_ops = { #endif #if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 99) .getattr_iflags = op_getattr_iflags, + .freezefs = op_freezefs, + .unfreezefs = op_unfreezefs, + .shutdownfs = op_shutdownfs, #endif #ifdef HAVE_FUSE_IOMAP .iomap_begin = op_iomap_begin,