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Add user.dwarfs.driver.pid xattr to toplevel entry

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This helps identify the dwarfs driver process associated with
a mounted filesystem.
This commit is contained in:
Marcus Holland-Moritz 2021-04-12 18:55:32 +02:00
parent b2fc36e95d
commit 3d36f92b85
1 changed files with 33 additions and 1 deletions
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34
src/dwarfs.cpp
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@ -419,6 +419,38 @@ void op_statfs(fuse_req_t req, fuse_ino_t /*ino*/) {
fuse_reply_err(req, err);
}
template <typename LoggerPolicy>
void op_getxattr(fuse_req_t req, fuse_ino_t ino, char const* name,
size_t size) {
dUSERDATA;
LOG_PROXY(LoggerPolicy, userdata->lgr);
LOG_DEBUG << __func__ << "(" << ino << ", " << name << ", " << size << ")";
static constexpr std::string_view pid_xattr{"user.dwarfs.driver.pid"};
int err = ENODATA;
try {
if (ino == FUSE_ROOT_ID && name == pid_xattr) {
auto pidstr = std::to_string(::getpid());
if (size > 0) {
fuse_reply_buf(req, pidstr.data(), pidstr.size());
} else {
fuse_reply_xattr(req, pidstr.size());
}
return;
}
} catch (dwarfs::system_error const& e) {
LOG_ERROR << e.what();
err = e.get_errno();
} catch (std::exception const& e) {
LOG_ERROR << e.what();
err = EIO;
}
fuse_reply_err(req, err);
}
void usage(const char* progname) {
std::cerr
<< "dwarfs (" << PRJ_GIT_ID << ", fuse version " << FUSE_USE_VERSION
@ -495,7 +527,7 @@ void init_lowlevel_ops(struct fuse_lowlevel_ops& ops) {
ops.read = &op_read<LoggerPolicy>;
ops.readdir = &op_readdir<LoggerPolicy>;
ops.statfs = &op_statfs<LoggerPolicy>;
// ops.getxattr = &op_getxattr<LoggerPolicy>;
ops.getxattr = &op_getxattr<LoggerPolicy>;
// ops.listxattr = &op_listxattr<LoggerPolicy>;
}