[PATCH 00/29] fs: require filesystems to explicitly opt-in to nfsd export support
Jeff Layton <[email protected]>
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In recent years, a number of filesystems that can't present stable filehandles have grown struct export_operations. They've mostly done this for local use-cases (enabling open_by_handle_at() and the like). Unfortunately, having export_operations is generally sufficient to make a filesystem be considered exportable via nfsd, but that requires that the server present stable filehandles. This patchset declares a new EXPORT_OP_STABLE_HANDLES flag, adds it to all of the filesystems that have stable filehandles, and then adds a check in nfsd to ensure that that flag is set for any filesystem to which it has been presented a handle. When a filesystem doesn't have this flag, it will treat the filehandle as stale. Signed-off-by: Jeff Layton <[email protected]> --- Jeff Layton (29): exportfs: add new EXPORT_OP_STABLE_HANDLES flag tmpfs: add EXPORT_OP_STABLE_HANDLES flag to export operations ext4: add EXPORT_OP_STABLE_HANDLES flag to export operations ext2: add EXPORT_OP_STABLE_HANDLES flag to export operations erofs: add EXPORT_OP_STABLE_HANDLES flag to export operations efs: add EXPORT_OP_STABLE_HANDLES flag to export operations xfs: add EXPORT_OP_STABLE_HANDLES flag to export operations ceph: add EXPORT_OP_STABLE_HANDLES flag to export operations btrfs: add EXPORT_OP_STABLE_HANDLES flag to export operations befs: add EXPORT_OP_STABLE_HANDLES flag to export operations ufs: add EXPORT_OP_STABLE_HANDLES flag to export operations udf: add EXPORT_OP_STABLE_HANDLES flag to export operations affs: add EXPORT_OP_STABLE_HANDLES flag to export operations squashfs: add EXPORT_OP_STABLE_HANDLES flag to export operations smb/client: add EXPORT_OP_STABLE_HANDLES flag to export operations ovl: add EXPORT_OP_STABLE_HANDLES flag to export operations orangefs: add EXPORT_OP_STABLE_HANDLES flag to export operations ocfs2: add EXPORT_OP_STABLE_HANDLES flag to export operations ntfs3: add EXPORT_OP_STABLE_HANDLES flag to export operations nilfs2: add EXPORT_OP_STABLE_HANDLES flag to export operations nfs: add EXPORT_OP_STABLE_HANDLES flag to export operations jfs: add EXPORT_OP_STABLE_HANDLES flag to export operations jffs2: add EXPORT_OP_STABLE_HANDLES flag to export operations isofs: add EXPORT_OP_STABLE_HANDLES flag to export operations gfs2: add EXPORT_OP_STABLE_HANDLES flag to export operations fuse: add EXPORT_OP_STABLE_HANDLES flag to export operations fat: add EXPORT_OP_STABLE_HANDLES flag to export operations f2fs: add EXPORT_OP_STABLE_HANDLES flag to export operations nfsd: only allow filesystems that set EXPORT_OP_STABLE_HANDLES fs/affs/namei.c | 1 + fs/befs/linuxvfs.c | 1 + fs/btrfs/export.c | 1 + fs/ceph/export.c | 1 + fs/efs/super.c | 1 + fs/erofs/super.c | 1 + fs/ext2/super.c | 1 + fs/ext4/super.c | 1 + fs/f2fs/super.c | 1 + fs/fat/nfs.c | 2 ++ fs/fuse/inode.c | 2 ++ fs/gfs2/export.c | 1 + fs/isofs/export.c | 1 + fs/jffs2/super.c | 1 + fs/jfs/super.c | 1 + fs/nfs/export.c | 3 ++- fs/nfsd/nfsfh.c | 4 ++++ fs/nilfs2/namei.c | 1 + fs/ntfs3/super.c | 1 + fs/ocfs2/export.c | 1 + fs/orangefs/super.c | 1 + fs/overlayfs/export.c | 2 ++ fs/smb/client/export.c | 1 + fs/squashfs/export.c | 3 ++- fs/udf/namei.c | 1 + fs/ufs/super.c | 1 + fs/xfs/xfs_export.c | 1 + include/linux/exportfs.h | 16 +++++++++------- mm/shmem.c | 1 + 29 files changed, 45 insertions(+), 9 deletions(-) --- base-commit: c537e12daeecaecdcd322c56a5f70659d2de7bde change-id: 20260114-exportfs-nfsd-12515072e9a9 Best regards, -- Jeff Layton <[email protected]>