/*
* __rename_file --
* WT_SESSION::rename for a file.
*/
static int
__rename_file(
WT_SESSION_IMPL *session, const char *uri, const char *newuri)
{
WT_DECL_RET;
bool exist;
const char *filename, *newfile;
char *newvalue, *oldvalue;
newvalue = oldvalue = NULL;
filename = uri;
newfile = newuri;
if (!WT_PREFIX_SKIP(filename, "file:") ||
!WT_PREFIX_SKIP(newfile, "file:"))
return (EINVAL);
/* Close any btree handles in the file. */
WT_WITH_HANDLE_LIST_LOCK(session,
ret = __wt_conn_dhandle_close_all(session, uri, false));
WT_ERR(ret);
/*
* First, check if the file being renamed exists in the system. Doing
* this check first matches the table rename behavior because we return
* WT_NOTFOUND when the renamed file doesn't exist (subsequently mapped
* to ENOENT by the session layer).
*/
WT_ERR(__wt_metadata_search(session, uri, &oldvalue));
/*
* Check to see if the proposed name is already in use, in either the
* metadata or the filesystem.
*/
switch (ret = __wt_metadata_search(session, newuri, &newvalue)) {
case 0:
WT_ERR_MSG(session, EEXIST, "%s", newuri);
/* NOTREACHED */
case WT_NOTFOUND:
break;
default:
WT_ERR(ret);
}
WT_ERR(__wt_fs_exist(session, newfile, &exist));
if (exist)
WT_ERR_MSG(session, EEXIST, "%s", newfile);
/* Replace the old file entries with new file entries. */
WT_ERR(__wt_metadata_remove(session, uri));
WT_ERR(__wt_metadata_insert(session, newuri, oldvalue));
/* Rename the underlying file. */
WT_ERR(__wt_fs_rename(session, filename, newfile, false));
if (WT_META_TRACKING(session))
WT_ERR(__wt_meta_track_fileop(session, uri, newuri));
err: __wt_free(session, newvalue);
__wt_free(session, oldvalue);
return (ret);
}
/*
* __drop_file --
* Drop a file.
*/
static int
__drop_file(
WT_SESSION_IMPL *session, const char *uri, bool force, const char *cfg[])
{
WT_CONFIG_ITEM cval;
WT_DECL_RET;
bool remove_files;
const char *filename;
WT_RET(__wt_config_gets(session, cfg, "remove_files", &cval));
remove_files = cval.val != 0;
filename = uri;
if (!WT_PREFIX_SKIP(filename, "file:"))
return (EINVAL);
/* Close all btree handles associated with this file. */
WT_WITH_HANDLE_LIST_LOCK(session,
ret = __wt_conn_dhandle_close_all(session, uri, force));
WT_RET(ret);
/* Remove the metadata entry (ignore missing items). */
WT_TRET(__wt_metadata_remove(session, uri));
if (!remove_files)
return (ret);
/*
* Schedule the remove of the underlying physical file when the drop
* completes.
*/
WT_TRET(__wt_meta_track_drop(session, filename));
return (ret);
}
/*
* __truncate_file --
* WT_SESSION::truncate for a file.
*/
static int
__truncate_file(WT_SESSION_IMPL *session, const char *name)
{
WT_DECL_RET;
const char *filename;
uint32_t allocsize;
filename = name;
if (!WT_PREFIX_SKIP(filename, "file:"))
return (EINVAL);
/* Open and lock the file. */
WT_RET(__wt_session_get_btree(
session, name, NULL, NULL, WT_DHANDLE_EXCLUSIVE));
/* Get the allocation size. */
allocsize = S2BT(session)->allocsize;
WT_RET(__wt_session_release_btree(session));
/* Close any btree handles in the file. */
WT_WITH_DHANDLE_LOCK(session,
ret = __wt_conn_dhandle_close_all(session, name, 0));
WT_RET(ret);
/* Delete the root address and truncate the file. */
WT_RET(__wt_meta_checkpoint_clear(session, name));
WT_RET(__wt_block_manager_truncate(session, filename, allocsize));
return (0);
}
/*
* __wt_exclusive_handle_operation --
* Get exclusive access to a file and apply a function.
*/
int
__wt_exclusive_handle_operation(WT_SESSION_IMPL *session,
const char *uri,
int (*file_func)(WT_SESSION_IMPL *, const char *[]),
const char *cfg[], uint32_t open_flags)
{
WT_DECL_RET;
/*
* If the operation requires exclusive access, close
* any open file handles, including checkpoints.
*/
if (FLD_ISSET(open_flags, WT_DHANDLE_EXCLUSIVE)) {
WT_WITH_HANDLE_LIST_WRITE_LOCK(session,
ret = __wt_conn_dhandle_close_all(
session, uri, false, false));
WT_RET(ret);
}
WT_RET(__wt_session_get_btree_ckpt(session, uri, cfg, open_flags));
WT_SAVE_DHANDLE(session, ret = file_func(session, cfg));
WT_TRET(__wt_session_release_dhandle(session));
return (ret);
}
/*修改文件名操作*/
static int __rename_file(WT_SESSION_IMPL* session, const char* uri, const char* newuri)
{
WT_DECL_RET;
int exist;
const char *filename, *newfile;
char *newvalue, *oldvalue;
newvalue = oldvalue = NULL;
filename = uri;
newfile = newuri;
if (!WT_PREFIX_SKIP(filename, "file:") || !WT_PREFIX_SKIP(newfile, "file:"))
return (EINVAL);
/*关闭这个文件对应的data source handler*/
WT_WITH_DHANDLE_LOCK(session, ret = __wt_conn_dhandle_close_all(session, uri, 0));
WT_ERR(ret);
/*
* First, check if the file being renamed exists in the system. Doing
* this check first matches the table rename behavior because we return
* WT_NOTFOUND when the renamed file doesn't exist (subsequently mapped
* to ENOENT by the session layer).
*/
/*先查出旧的文件名uri对应的meta 信息，再用新的文件名uri旧版本的meta信息*/
WT_ERR(__wt_metadata_search(session, uri, &oldvalue));
switch (ret = __wt_metadata_search(session, newuri, &newvalue)) {
case 0:
WT_ERR_MSG(session, EEXIST, "%s", newuri);
/* NOTREACHED */
case WT_NOTFOUND:
break;
default:
WT_ERR(ret);
}
WT_ERR(__wt_exist(session, newfile, &exist));
if (exist)
WT_ERR_MSG(session, EEXIST, "%s", newfile);
/* Replace the old file entries with new file entries. */
WT_ERR(__wt_metadata_remove(session, uri));
WT_ERR(__wt_metadata_insert(session, newuri, oldvalue));
WT_ERR(__wt_rename(session, filename, newfile));
if(WT_META_TRACKING(session))
WT_ERR(__wt_meta_track_fileop(session, uri, newuri));
err:
__wt_free(session, newvalue);
__wt_free(session, oldvalue);
return ret;
}
/*
* __drop_file --
* Drop a file.
*/
static int
__drop_file(
WT_SESSION_IMPL *session, const char *uri, int force, const char *cfg[])
{
WT_CONFIG_ITEM cval;
WT_DECL_RET;
int exist, remove_files;
const char *filename;
WT_RET(__wt_config_gets(session, cfg, "remove_files", &cval));
remove_files = (cval.val != 0);
filename = uri;
if (!WT_PREFIX_SKIP(filename, "file:"))
return (EINVAL);
/* Close all btree handles associated with this file. */
WT_WITH_DHANDLE_LOCK(session,
ret = __wt_conn_dhandle_close_all(session, uri, force));
WT_RET(ret);
/* Remove the metadata entry (ignore missing items). */
WT_TRET(__wt_metadata_remove(session, uri));
if (!remove_files)
return (ret);
/* Remove the underlying physical file. */
exist = 0;
WT_TRET(__wt_exist(session, filename, &exist));
if (exist) {
/*
* There is no point tracking this operation: there is no going
* back from here.
*/
WT_TRET(__wt_remove(session, filename));
}
return (ret);
}
