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fusefs: test that open(2) can return a writable fd for a readonly file

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Surprisingly, open(..., O_WRONLY | O_CREAT, 0444) should work.  POSIX
requires it.  But it didn't work in early FUSE implementations.  Add a
regression test so that our FUSE driver doesn't make the same mistake.

Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Alan Somers 2019-03-29 21:52:10 +00:00
parent 61c225f92c
commit 2d445be156
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/projects/fuse2/; revision=345717
1 changed files with 72 additions and 74 deletions
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146
tests/sys/fs/fusefs/create.cc
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@ -37,7 +37,23 @@ extern "C" {
using namespace testing;
class Create: public FuseTest {};
class Create: public FuseTest {
public:
void expect_create(const char *relpath, ProcessMockerT r)
{
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
const char *name = (const char*)in->body.bytes +
sizeof(fuse_open_in);
return (in->header.opcode == FUSE_CREATE &&
(0 == strcmp(relpath, name)));
}, Eq(true)),
_)
).WillOnce(Invoke(r));
}
};
/*
* If FUSE_CREATE sets the attr_valid, then subsequent GETATTRs should use the
@ -53,22 +69,13 @@ TEST_F(Create, DISABLED_attr_cache)
int fd;
EXPECT_LOOKUP(1, RELPATH).WillOnce(Invoke(ReturnErrno(ENOENT)));
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
const char *name = (const char*)in->body.bytes +
sizeof(fuse_open_in);
return (in->header.opcode == FUSE_CREATE &&
(0 == strcmp(RELPATH, name)));
}, Eq(true)),
_)
).WillOnce(Invoke(ReturnImmediate([=](auto in __unused, auto out) {
expect_create(RELPATH, ReturnImmediate([=](auto in __unused, auto out) {
SET_OUT_HEADER_LEN(out, create);
out->body.create.entry.attr.mode = S_IFREG | mode;
out->body.create.entry.nodeid = ino;
out->body.create.entry.entry_valid = UINT64_MAX;
out->body.create.entry.attr_valid = UINT64_MAX;
})));
}));
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
@ -95,16 +102,7 @@ TEST_F(Create, eexist)
mode_t mode = 0755;
EXPECT_LOOKUP(1, RELPATH).WillOnce(Invoke(ReturnErrno(ENOENT)));
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
const char *name = (const char*)in->body.bytes +
sizeof(fuse_open_in);
return (in->header.opcode == FUSE_CREATE &&
(0 == strcmp(RELPATH, name)));
}, Eq(true)),
_)
).WillOnce(Invoke(ReturnErrno(EEXIST)));
expect_create(RELPATH, ReturnErrno(EEXIST));
EXPECT_NE(0, open(FULLPATH, O_CREAT | O_EXCL, mode));
EXPECT_EQ(EEXIST, errno);
}
@ -122,16 +120,7 @@ TEST_F(Create, Enosys)
int fd;
EXPECT_LOOKUP(1, RELPATH).WillOnce(Invoke(ReturnErrno(ENOENT)));
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
const char *name = (const char*)in->body.bytes +
sizeof(fuse_open_in);
return (in->header.opcode == FUSE_CREATE &&
(0 == strcmp(RELPATH, name)));
}, Eq(true)),
_)
).WillOnce(Invoke(ReturnErrno(ENOSYS)));
expect_create(RELPATH, ReturnErrno(ENOSYS));
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
@ -199,22 +188,13 @@ TEST_F(Create, entry_cache_negative)
/* create will first do a LOOKUP, adding a negative cache entry */
EXPECT_LOOKUP(1, RELPATH).WillOnce(ReturnNegativeCache(&entry_valid));
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
const char *name = (const char*)in->body.bytes +
sizeof(fuse_open_in);
return (in->header.opcode == FUSE_CREATE &&
(0 == strcmp(RELPATH, name)));
}, Eq(true)),
_)
).WillOnce(Invoke(ReturnImmediate([=](auto i __unused, auto out) {
expect_create(RELPATH, ReturnImmediate([=](auto in __unused, auto out) {
SET_OUT_HEADER_LEN(out, create);
out->body.create.entry.attr.mode = S_IFREG | mode;
out->body.create.entry.nodeid = ino;
out->body.create.entry.entry_valid = UINT64_MAX;
out->body.create.entry.attr_valid = UINT64_MAX;
})));
}));
/* Until the attr cache is working, we may send an additional GETATTR */
EXPECT_CALL(*m_mock, process(
@ -252,20 +232,12 @@ TEST_F(Create, entry_cache_negative_purge)
.RetiresOnSaturation();
/* Then the CREATE should purge the negative cache entry */
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
const char *name = (const char*)in->body.bytes +
sizeof(fuse_open_in);
return (in->header.opcode == FUSE_CREATE &&
(0 == strcmp(RELPATH, name)));
}, Eq(true)),
_)
).WillOnce(Invoke(ReturnImmediate([=](auto i __unused, auto out) {
expect_create(RELPATH, ReturnImmediate([=](auto in __unused, auto out) {
SET_OUT_HEADER_LEN(out, create);
out->body.create.entry.attr.mode = S_IFREG | mode;
out->body.create.entry.nodeid = ino;
out->body.create.entry.attr_valid = UINT64_MAX;
})));
}));
/* Until the attr cache is working, we may send an additional GETATTR */
EXPECT_CALL(*m_mock, process(
@ -301,16 +273,8 @@ TEST_F(Create, eperm)
mode_t mode = 0755;
EXPECT_LOOKUP(1, RELPATH).WillOnce(Invoke(ReturnErrno(ENOENT)));
expect_create(RELPATH, ReturnErrno(EPERM));
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
const char *name = (const char*)in->body.bytes +
sizeof(fuse_open_in);
return (in->header.opcode == FUSE_CREATE &&
(0 == strcmp(RELPATH, name)));
}, Eq(true)),
_)
).WillOnce(Invoke(ReturnErrno(EPERM)));
EXPECT_NE(0, open(FULLPATH, O_CREAT | O_EXCL, mode));
EXPECT_EQ(EPERM, errno);
}
@ -324,22 +288,13 @@ TEST_F(Create, ok)
int fd;
EXPECT_LOOKUP(1, RELPATH).WillOnce(Invoke(ReturnErrno(ENOENT)));
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
const char *name = (const char*)in->body.bytes +
sizeof(fuse_open_in);
return (in->header.opcode == FUSE_CREATE &&
(0 == strcmp(RELPATH, name)));
}, Eq(true)),
_)
).WillOnce(Invoke(ReturnImmediate([=](auto i __unused, auto out) {
expect_create(RELPATH, ReturnImmediate([=](auto in __unused, auto out) {
SET_OUT_HEADER_LEN(out, create);
out->body.create.entry.attr.mode = S_IFREG | mode;
out->body.create.entry.nodeid = ino;
out->body.create.entry.entry_valid = UINT64_MAX;
out->body.create.entry.attr_valid = UINT64_MAX;
})));
}));
/* Until the attr cache is working, we may send an additional GETATTR */
EXPECT_CALL(*m_mock, process(
@ -351,10 +306,53 @@ TEST_F(Create, ok)
).WillRepeatedly(Invoke(ReturnImmediate([=](auto i __unused, auto out) {
SET_OUT_HEADER_LEN(out, attr);
out->body.attr.attr.ino = ino; // Must match nodeid
out->body.attr.attr.mode = S_IFREG | 0644;
out->body.attr.attr.mode = S_IFREG | mode;
})));
fd = open(FULLPATH, O_CREAT | O_EXCL, mode);
EXPECT_LE(0, fd) << strerror(errno);
/* Deliberately leak fd. close(2) will be tested in release.cc */
}
/*
* A regression test for a bug that affected old FUSE implementations:
* open(..., O_WRONLY | O_CREAT, 0444) should work despite the seeming
* contradiction between O_WRONLY and 0444
*
* For example:
* https://bugs.launchpad.net/ubuntu/+source/sshfs-fuse/+bug/44886
*/
TEST_F(Create, wronly_0444)
{
const char FULLPATH[] = "mountpoint/some_file.txt";
const char RELPATH[] = "some_file.txt";
mode_t mode = 0444;
uint64_t ino = 42;
int fd;
EXPECT_LOOKUP(1, RELPATH).WillOnce(Invoke(ReturnErrno(ENOENT)));
expect_create(RELPATH, ReturnImmediate([=](auto in __unused, auto out) {
SET_OUT_HEADER_LEN(out, create);
out->body.create.entry.attr.mode = S_IFREG | mode;
out->body.create.entry.nodeid = ino;
out->body.create.entry.entry_valid = UINT64_MAX;
out->body.create.entry.attr_valid = UINT64_MAX;
}));
/* Until the attr cache is working, we may send an additional GETATTR */
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
return (in->header.opcode == FUSE_GETATTR &&
in->header.nodeid == ino);
}, Eq(true)),
_)
).WillRepeatedly(Invoke(ReturnImmediate([=](auto i __unused, auto out) {
SET_OUT_HEADER_LEN(out, attr);
out->body.attr.attr.ino = ino; // Must match nodeid
out->body.attr.attr.mode = S_IFREG | mode;
})));
fd = open(FULLPATH, O_CREAT | O_WRONLY, mode);
EXPECT_LE(0, fd) << strerror(errno);
/* Deliberately leak fd. close(2) will be tested in release.cc */
}