git: 4a0c5d391f8a - stable/13 - fusefs: fix VOP_ADVLOCK with SEEK_END
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Date: Wed, 23 Nov 2022 20:55:26 UTC
The branch stable/13 has been updated by asomers: URL: https://cgit.FreeBSD.org/src/commit/?id=4a0c5d391f8a586ea0af4e18b6451ac2e84b6639 commit 4a0c5d391f8a586ea0af4e18b6451ac2e84b6639 Author: Alan Somers <asomers@FreeBSD.org> AuthorDate: 2022-10-11 23:00:07 +0000 Commit: Alan Somers <asomers@FreeBSD.org> CommitDate: 2022-11-23 20:55:15 +0000 fusefs: fix VOP_ADVLOCK with SEEK_END When the user specifies SEEK_END, unlike SEEK_CUR, VOP_ADVLOCK must adjust lock offsets itself. Sort-of related to bug 266886. Reviewed by: emaste Differential Revision: https://reviews.freebsd.org/D37040 (cherry picked from commit f6e5319550f60170840f1a07a9cbdd45b5014a21) --- sys/fs/fuse/fuse_vnops.c | 33 +++++++++++- tests/sys/fs/fusefs/locks.cc | 122 ++++++++++++++++++++++++++++++++++++++++++ tests/sys/fs/fusefs/mockfs.cc | 14 ++++- 3 files changed, 166 insertions(+), 3 deletions(-) diff --git a/sys/fs/fuse/fuse_vnops.c b/sys/fs/fuse/fuse_vnops.c index fb94be178743..eaace113d67e 100644 --- a/sys/fs/fuse/fuse_vnops.c +++ b/sys/fs/fuse/fuse_vnops.c @@ -476,7 +476,9 @@ fuse_vnop_advlock(struct vop_advlock_args *ap) struct fuse_dispatcher fdi; struct fuse_lk_in *fli; struct fuse_lk_out *flo; + struct vattr vattr; enum fuse_opcode op; + off_t size, start; int dataflags, err; int flags = ap->a_flags; @@ -511,6 +513,33 @@ fuse_vnop_advlock(struct vop_advlock_args *ap) vn_lock(vp, LK_SHARED | LK_RETRY); + switch (fl->l_whence) { + case SEEK_SET: + case SEEK_CUR: + /* + * Caller is responsible for adding any necessary offset + * when SEEK_CUR is used. + */ + start = fl->l_start; + break; + + case SEEK_END: + err = fuse_internal_getattr(vp, &vattr, cred, td); + if (err) + goto out; + size = vattr.va_size; + if (size > OFF_MAX || + (fl->l_start > 0 && size > OFF_MAX - fl->l_start)) { + err = EOVERFLOW; + goto out; + } + start = size + fl->l_start; + break; + + default: + return (EINVAL); + } + err = fuse_filehandle_get_anyflags(vp, &fufh, cred, pid); if (err) goto out; @@ -521,9 +550,9 @@ fuse_vnop_advlock(struct vop_advlock_args *ap) fli = fdi.indata; fli->fh = fufh->fh_id; fli->owner = td->td_proc->p_pid; - fli->lk.start = fl->l_start; + fli->lk.start = start; if (fl->l_len != 0) - fli->lk.end = fl->l_start + fl->l_len - 1; + fli->lk.end = start + fl->l_len - 1; else fli->lk.end = INT64_MAX; fli->lk.type = fl->l_type; diff --git a/tests/sys/fs/fusefs/locks.cc b/tests/sys/fs/fusefs/locks.cc index f637c65cff24..c7c652dd573b 100644 --- a/tests/sys/fs/fusefs/locks.cc +++ b/tests/sys/fs/fusefs/locks.cc @@ -420,6 +420,71 @@ TEST_F(Getlk, seek_cur) leak(fd); } +/* + * F_GETLK with SEEK_END + */ +TEST_F(Getlk, seek_end) +{ + const char FULLPATH[] = "mountpoint/some_file.txt"; + const char RELPATH[] = "some_file.txt"; + uint64_t ino = 42; + struct flock fl; + int fd; + pid_t pid = getpid(); + + expect_lookup(RELPATH, ino, 1024); + expect_open(ino, 0, 1); + EXPECT_CALL(*m_mock, process( + ResultOf([=](auto in) { + return (in.header.opcode == FUSE_GETLK && + in.header.nodeid == ino && + in.body.getlk.fh == FH && + /* + * Though it seems useless, libfuse expects the + * owner and pid fields to be set during + * FUSE_GETLK. + */ + in.body.getlk.owner == (uint32_t)pid && + in.body.getlk.lk.pid == (uint64_t)pid && + in.body.getlk.lk.start == 512 && + in.body.getlk.lk.end == 1023 && + in.body.getlk.lk.type == F_RDLCK); + }, Eq(true)), + _) + ).WillOnce(Invoke(ReturnImmediate([=](auto in __unused, auto& out) { + SET_OUT_HEADER_LEN(out, getlk); + out.body.getlk.lk.start = 400; + out.body.getlk.lk.end = 499; + out.body.getlk.lk.type = F_WRLCK; + out.body.getlk.lk.pid = (uint32_t)pid + 1; + }))); + + fd = open(FULLPATH, O_RDWR); + ASSERT_LE(0, fd) << strerror(errno); + ASSERT_NE(-1, lseek(fd, 500, SEEK_SET)); + + fl.l_start = -512; + fl.l_len = 512; + fl.l_pid = 42; + fl.l_type = F_RDLCK; + fl.l_whence = SEEK_END; + fl.l_sysid = 0; + ASSERT_NE(-1, fcntl(fd, F_GETLK, &fl)) << strerror(errno); + + /* + * After a successful F_GETLK request, the value of l_whence is + * SEEK_SET. + */ + EXPECT_EQ(F_WRLCK, fl.l_type); + EXPECT_EQ(fl.l_pid, pid + 1); + EXPECT_EQ(fl.l_start, 400); + EXPECT_EQ(fl.l_len, 100); + EXPECT_EQ(fl.l_whence, SEEK_SET); + ASSERT_EQ(fl.l_sysid, 0); + + leak(fd); +} + /* * If the fuse filesystem does not support posix file locks, then the kernel * should fall back to local locks. @@ -525,6 +590,63 @@ TEST_F(Setlk, set_eof) leak(fd); } +/* Set a new lock with FUSE_SETLK, using SEEK_CUR for l_whence */ +TEST_F(Setlk, set_seek_cur) +{ + const char FULLPATH[] = "mountpoint/some_file.txt"; + const char RELPATH[] = "some_file.txt"; + uint64_t ino = 42; + struct flock fl; + int fd; + pid_t pid = getpid(); + + expect_lookup(RELPATH, ino, 1024); + expect_open(ino, 0, 1); + expect_setlk(ino, pid, 500, 509, F_RDLCK, 0); + + fd = open(FULLPATH, O_RDWR); + ASSERT_LE(0, fd) << strerror(errno); + ASSERT_NE(-1, lseek(fd, 500, SEEK_SET)); + + fl.l_start = 0; + fl.l_len = 10; + fl.l_pid = 0; + fl.l_type = F_RDLCK; + fl.l_whence = SEEK_CUR; + fl.l_sysid = 0; + ASSERT_NE(-1, fcntl(fd, F_SETLK, &fl)) << strerror(errno); + + leak(fd); +} + +/* Set a new lock with FUSE_SETLK, using SEEK_END for l_whence */ +TEST_F(Setlk, set_seek_end) +{ + const char FULLPATH[] = "mountpoint/some_file.txt"; + const char RELPATH[] = "some_file.txt"; + uint64_t ino = 42; + struct flock fl; + int fd; + pid_t pid = getpid(); + + expect_lookup(RELPATH, ino, 1024); + expect_open(ino, 0, 1); + expect_setlk(ino, pid, 1000, 1009, F_RDLCK, 0); + + fd = open(FULLPATH, O_RDWR); + ASSERT_LE(0, fd) << strerror(errno); + + fl.l_start = -24; + fl.l_len = 10; + fl.l_pid = 0; + fl.l_type = F_RDLCK; + fl.l_whence = SEEK_END; + fl.l_sysid = 0; + ASSERT_NE(-1, fcntl(fd, F_SETLK, &fl)) << strerror(errno); + + leak(fd); +} + /* Fail to set a new lock with FUSE_SETLK due to a conflict */ TEST_F(Setlk, eagain) { diff --git a/tests/sys/fs/fusefs/mockfs.cc b/tests/sys/fs/fusefs/mockfs.cc index 9a197d8a80f0..e012df8c3488 100644 --- a/tests/sys/fs/fusefs/mockfs.cc +++ b/tests/sys/fs/fusefs/mockfs.cc @@ -229,6 +229,18 @@ void MockFS::debug_request(const mockfs_buf_in &in, ssize_t buflen) case FUSE_FSYNCDIR: printf(" flags=%#x", in.body.fsyncdir.fsync_flags); break; + case FUSE_GETLK: + printf(" fh=%#" PRIx64 + " type=%u pid=%u", + in.body.getlk.fh, + in.body.getlk.lk.type, + in.body.getlk.lk.pid); + if (verbosity >= 2) { + printf(" range=[%" PRIi64 ":%" PRIi64 "]", + in.body.getlk.lk.start, + in.body.getlk.lk.end); + } + break; case FUSE_INTERRUPT: printf(" unique=%" PRIu64, in.body.interrupt.unique); break; @@ -338,7 +350,7 @@ void MockFS::debug_request(const mockfs_buf_in &in, ssize_t buflen) in.body.setlk.lk.type, in.body.setlk.lk.pid); if (verbosity >= 2) { - printf(" range=[%" PRIu64 "-%" PRIu64 "]", + printf(" range=[%" PRIi64 ":%" PRIi64 "]", in.body.setlk.lk.start, in.body.setlk.lk.end); }