emo/thin-provisioning-tools
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This commit is contained in:
Joe Thornber
2014-07-29 11:34:26 +01:00
parent d482a76bda
commit f06a2673c5
12 changed files with 122 additions and 80 deletions
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1
persistent-data/block.h
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@@ -135,6 +135,7 @@ namespace persistent_data {
bool is_locked(block_address b) const;
private:
int open_or_create_block_file(std::string const &path, off_t file_size, mode m);
void check(block_address b) const;
int fd_;

26
persistent-data/block.tcc
View File

@@ -84,10 +84,9 @@ namespace {
int fd = open_file(path, O_CREAT | O_RDWR);
// fallocate didn't seem to work
int r = ::lseek(fd, file_size, SEEK_SET);
int r = ::ftruncate(fd, file_size);
if (r < 0)
syscall_failed("lseek");
syscall_failed("ftruncate");
return fd;
}
@@ -179,11 +178,30 @@ namespace persistent_data {
block_address nr_blocks,
unsigned max_concurrent_blocks,
mode m)
: fd_(open_block_file(path, nr_blocks * BlockSize, m == READ_WRITE)),
: fd_(open_or_create_block_file(path, nr_blocks * BlockSize, m)),
bc_(fd_, BlockSize >> SECTOR_SHIFT, nr_blocks, 1024u * 1024u * 16)
{
}
template <uint32_t BlockSize>
int
block_manager<BlockSize>::open_or_create_block_file(string const &path, off_t file_size, mode m)
{
switch (m) {
case READ_ONLY:
return open_block_file(path, file_size, false);
case READ_WRITE:
return open_block_file(path, file_size, true);
case CREATE:
return create_block_file(path, file_size);
default:
throw std::runtime_error("unsupported mode");
}
}
template <uint32_t BlockSize>
typename block_manager<BlockSize>::read_ref
block_manager<BlockSize>::read_lock(block_address location,