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[io_engine] Add exclusive flag to io_engine

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This commit is contained in:
Joe Thornber
2016-06-07 13:45:27 +01:00
parent df9f4d479d
commit 07f44e9c77
3 changed files with 13 additions and 7 deletions
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4
block-cache/io_engine.cc
View File

@@ -75,9 +75,11 @@ aio_engine::~aio_engine()
}
aio_engine::handle
aio_engine::open_file(std::string const &path, mode m)
aio_engine::open_file(std::string const &path, mode m, sharing s)
{
int flags = (m == READ_ONLY) ? O_RDONLY : O_RDWR;
if (s == EXCLUSIVE)
flags |= O_EXCL;
int fd = ::open(path.c_str(), O_DIRECT | flags);
if (fd < 0) {
ostringstream out;

10
block-cache/io_engine.h
View File

@@ -27,12 +27,17 @@ namespace bcache {
WRITE
};
enum sharing {
EXCLUSIVE,
SHARED
};
io_engine() {}
virtual ~io_engine() {}
using handle = unsigned;
virtual handle open_file(std::string const &path, mode m) = 0;
virtual handle open_file(std::string const &path, mode m, sharing s = EXCLUSIVE) = 0;
virtual void close_file(handle h) = 0;
// returns false if there are insufficient resources to
@@ -79,8 +84,7 @@ namespace bcache {
using handle = unsigned;
// FIXME: open exclusive?
virtual handle open_file(std::string const &path, mode m);
virtual handle open_file(std::string const &path, mode m, sharing s = EXCLUSIVE);
virtual void close_file(handle h);
// Returns false if queueing the io failed