Tools now open the metadata device in O_EXCL mode.
An attempt to stop people running the tools on active metadata.
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@ -52,7 +52,8 @@ namespace persistent_data {
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block_manager(std::string const &path,
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block_address nr_blocks,
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unsigned max_concurrent_locks,
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mode m);
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mode m,
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bool excl = true);
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class read_ref {
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public:
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@ -134,7 +135,8 @@ namespace persistent_data {
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bool is_locked(block_address b) const;
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private:
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int open_or_create_block_file(std::string const &path, off_t file_size, mode m);
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int open_or_create_block_file(std::string const &path, off_t file_size,
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mode m, bool excl);
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void check(block_address b) const;
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int fd_;
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@ -80,7 +80,7 @@ namespace {
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throw runtime_error(out.str());
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}
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int fd = open_file(path, O_CREAT | O_RDWR);
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int fd = open_file(path, O_CREAT | O_EXCL | O_RDWR);
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int r = ::ftruncate(fd, file_size);
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if (r < 0)
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@ -89,14 +89,18 @@ namespace {
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return fd;
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}
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int open_block_file(string const &path, off_t min_size, bool writeable) {
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int open_block_file(string const &path, off_t min_size, bool writeable, bool excl = true) {
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if (!file_exists(path)) {
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ostringstream out;
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out << __FUNCTION__ << ": file '" << path << "' doesn't exist";
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throw runtime_error(out.str());
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}
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return open_file(path, writeable ? O_RDWR : O_RDONLY);
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int flags = writeable ? O_RDWR : O_RDONLY;
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if (excl)
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flags |= O_EXCL;
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return open_file(path, flags);
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}
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};
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@ -208,8 +212,9 @@ namespace persistent_data {
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block_manager<BlockSize>::block_manager(std::string const &path,
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block_address nr_blocks,
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unsigned max_concurrent_blocks,
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mode m)
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: fd_(open_or_create_block_file(path, nr_blocks * BlockSize, m)),
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mode m,
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bool excl)
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: fd_(open_or_create_block_file(path, nr_blocks * BlockSize, m, excl)),
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bc_(fd_, BlockSize >> SECTOR_SHIFT, nr_blocks, 1024u * 1024u * 16),
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superblock_ref_count_(0)
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{
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@ -217,14 +222,14 @@ namespace persistent_data {
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template <uint32_t BlockSize>
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int
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block_manager<BlockSize>::open_or_create_block_file(string const &path, off_t file_size, mode m)
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block_manager<BlockSize>::open_or_create_block_file(string const &path, off_t file_size, mode m, bool excl)
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{
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switch (m) {
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case READ_ONLY:
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return open_block_file(path, file_size, false);
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return open_block_file(path, file_size, false, excl);
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case READ_WRITE:
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return open_block_file(path, file_size, true);
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return open_block_file(path, file_size, true, excl);
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case CREATE:
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return create_block_file(path, file_size);
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@ -48,10 +48,10 @@ persistent_data::get_nr_blocks(string const &path)
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}
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persistent_data::block_manager<>::ptr
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persistent_data::open_bm(std::string const &dev_path, block_manager<>::mode m)
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persistent_data::open_bm(std::string const &dev_path, block_manager<>::mode m, bool excl)
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{
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block_address nr_blocks = get_nr_blocks(dev_path);
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return block_manager<>::ptr(new block_manager<>(dev_path, nr_blocks, 1, m));
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return block_manager<>::ptr(new block_manager<>(dev_path, nr_blocks, 1, m, excl));
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}
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void
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@ -10,7 +10,8 @@
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// FIXME: move to a different unit
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namespace persistent_data {
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persistent_data::block_address get_nr_blocks(string const &path);
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block_manager<>::ptr open_bm(std::string const &dev_path, block_manager<>::mode m);
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block_manager<>::ptr open_bm(std::string const &dev_path,
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block_manager<>::mode m, bool excl = true);
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void check_file_exists(std::string const &file);
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}
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@ -118,7 +118,7 @@ metadata::metadata(std::string const &dev_path, open_type ot,
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metadata::metadata(std::string const &dev_path, block_address metadata_snap)
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{
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tm_ = open_tm(open_bm(dev_path, block_manager<>::READ_ONLY));
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tm_ = open_tm(open_bm(dev_path, block_manager<>::READ_ONLY, !metadata_snap));
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sb_ = read_superblock(tm_->get_bm(), metadata_snap);
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// We don't open the metadata sm for a held root
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@ -27,6 +27,7 @@
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#include "xml_format.h"
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#include "version.h"
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#include "thin-provisioning/commands.h"
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#include "persistent-data/file_utils.h"
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using namespace persistent_data;
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using namespace std;
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@ -38,24 +39,25 @@ struct flags {
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};
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namespace {
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block_address find_metadata_snap(string const &path)
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{
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superblock_detail::superblock sb = read_superblock(open_bm(path, block_manager<>::READ_ONLY, false), 0);
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uint64_t ms = sb.metadata_snap_;
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if (!ms) {
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cerr << "no metadata snapshot found!" << endl;
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exit(1);
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}
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return ms;
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}
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int dump_(string const &path, ostream &out, string const &format, struct flags &flags,
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block_address metadata_snap) {
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try {
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metadata::ptr md(new metadata(path, metadata_snap));
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emitter::ptr e;
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if (flags.find_metadata_snap) {
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uint64_t metadata_snap_root = md->sb_.metadata_snap_; /* FIXME: use thin_pool method? */
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if (metadata_snap_root) {
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md.reset();
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md = metadata::ptr(new metadata(path, metadata_snap_root));
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} else {
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cerr << "no metadata snapshot found!" << endl;
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exit(1);
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}
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}
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if (format == "xml")
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e = create_xml_emitter(out);
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else if (format == "human_readable")
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@ -164,6 +166,9 @@ int thin_dump_main(int argc, char **argv)
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return 1;
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}
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if (flags.find_metadata_snap)
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metadata_snap = find_metadata_snap(argv[optind]);
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return dump(argv[optind], output, format, flags, metadata_snap);
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}
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