git: 55b80e2ca52c - main - fusefs: fix invalid value for st_birthtime.tv_nsec
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Date: Sun, 04 Feb 2024 21:02:53 UTC
The branch main has been updated by asomers: URL: https://cgit.FreeBSD.org/src/commit/?id=55b80e2ca52c4b27c4920d372a6e71ac9ab7da9e commit 55b80e2ca52c4b27c4920d372a6e71ac9ab7da9e Author: Alan Somers <asomers@FreeBSD.org> AuthorDate: 2024-01-25 15:19:37 +0000 Commit: Alan Somers <asomers@FreeBSD.org> CommitDate: 2024-02-04 21:01:06 +0000 fusefs: fix invalid value for st_birthtime.tv_nsec If a file system's on-disk format does not support st_birthtime, it isn't clear what value it should return in stat(2). Neither our man page nor the OpenGroup specifies. But our convention for UFS and msdosfs is to return { .tv_sec = -1, .tv_nsec = 0 }. fusefs is different. It returns { .tv_sec = -1, .tv_nsec = -1 }. It's done that ever since the initial import in SVN r241519. Most software apparently handles this just fine. It must, because we've had no complaints. But the Rust standard library will panic when reading such a timestamp during std::fs::metadata, even if the caller doesn't care about that particular value. That's a separate bug, and should be fixed. Change our invalid value to match msdosfs and ufs, pacifying the Rust standard library. PR: 276602 MFC after: 1 week Sponsored by: Axcient Reviewed by: emaste Differential Revision: https://reviews.freebsd.org/D43590 --- sys/fs/fuse/fuse_internal.c | 1 - sys/fs/fuse/fuse_node.c | 7 +++++++ tests/sys/fs/fusefs/getattr.cc | 15 +++++++++------ tests/sys/fs/fusefs/lookup.cc | 15 +++++++++------ 4 files changed, 25 insertions(+), 13 deletions(-) diff --git a/sys/fs/fuse/fuse_internal.c b/sys/fs/fuse/fuse_internal.c index f4a2e7efc908..ffbf1f9bcc40 100644 --- a/sys/fs/fuse/fuse_internal.c +++ b/sys/fs/fuse/fuse_internal.c @@ -325,7 +325,6 @@ fuse_internal_cache_attrs(struct vnode *vp, struct fuse_attr *attr, else return; - vattr_null(vp_cache_at); vp_cache_at->va_fsid = mp->mnt_stat.f_fsid.val[0]; vp_cache_at->va_fileid = attr->ino; vp_cache_at->va_mode = attr->mode & ~S_IFMT; diff --git a/sys/fs/fuse/fuse_node.c b/sys/fs/fuse/fuse_node.c index ecff94cf6dd9..13c2b59c7c97 100644 --- a/sys/fs/fuse/fuse_node.c +++ b/sys/fs/fuse/fuse_node.c @@ -155,7 +155,14 @@ fuse_vnode_init(struct vnode *vp, struct fuse_vnode_data *fvdat, { fvdat->nid = nodeid; LIST_INIT(&fvdat->handles); + vattr_null(&fvdat->cached_attrs); + fvdat->cached_attrs.va_birthtime.tv_sec = -1; + fvdat->cached_attrs.va_birthtime.tv_nsec = 0; + fvdat->cached_attrs.va_fsid = VNOVAL; + fvdat->cached_attrs.va_gen = 0; + fvdat->cached_attrs.va_rdev = NODEV; + if (nodeid == FUSE_ROOT_ID) { vp->v_vflag |= VV_ROOT; } diff --git a/tests/sys/fs/fusefs/getattr.cc b/tests/sys/fs/fusefs/getattr.cc index 1795f29a5d76..98a757fdff94 100644 --- a/tests/sys/fs/fusefs/getattr.cc +++ b/tests/sys/fs/fusefs/getattr.cc @@ -246,12 +246,15 @@ TEST_F(Getattr, ok) EXPECT_EQ(ino, sb.st_ino); EXPECT_EQ(S_IFREG | 0644, sb.st_mode); - //st_birthtim and st_flags are not supported by protocol 7.8. They're - //only supported as OS-specific extensions to OSX. - //EXPECT_EQ(, sb.st_birthtim); - //EXPECT_EQ(, sb.st_flags); - - //FUSE can't set st_blksize until protocol 7.9 + /* + * st_birthtim and st_flags are not supported by the fuse protocol. + * They're only supported as OS-specific extensions to OSX. For + * birthtime, the convention for "not supported" is "negative one + * second". + */ + EXPECT_EQ(-1, sb.st_birthtim.tv_sec); + EXPECT_EQ(0, sb.st_birthtim.tv_nsec); + EXPECT_EQ(0u, sb.st_flags); } /* diff --git a/tests/sys/fs/fusefs/lookup.cc b/tests/sys/fs/fusefs/lookup.cc index 549df0369fa7..6d506c1ab700 100644 --- a/tests/sys/fs/fusefs/lookup.cc +++ b/tests/sys/fs/fusefs/lookup.cc @@ -112,12 +112,15 @@ TEST_F(Lookup, attr_cache) // fuse(4) does not _yet_ support inode generations //EXPECT_EQ(generation, sb.st_gen); - //st_birthtim and st_flags are not supported by protocol 7.8. They're - //only supported as OS-specific extensions to OSX. - //EXPECT_EQ(, sb.st_birthtim); - //EXPECT_EQ(, sb.st_flags); - - //FUSE can't set st_blksize until protocol 7.9 + /* + * st_birthtim and st_flags are not supported by the fuse protocol. + * They're only supported as OS-specific extensions to OSX. For + * birthtime, the convention for "not supported" is "negative one + * second". + */ + EXPECT_EQ(-1, sb.st_birthtim.tv_sec); + EXPECT_EQ(0, sb.st_birthtim.tv_nsec); + EXPECT_EQ(0u, sb.st_flags); } /*