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/*-
* Copyright (c) 2014-2016 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* __wt_filename --
* Build a file name in a scratch buffer, automatically calculate the
* length of the file name.
*/
int
__wt_filename(WT_SESSION_IMPL *session, const char *name, char **path)
{
return (__wt_nfilename(session, name, strlen(name), path));
}
/*
* __wt_nfilename --
* Build a file name in a scratch buffer. If the name is already an
* absolute path duplicate it, otherwise generate a path relative to the
* connection home directory.
* Needs to work with a NULL session handle - since this is called via
* the exists API which is used by the test utilities.
*/
int
__wt_nfilename(
WT_SESSION_IMPL *session, const char *name, size_t namelen, char **path)
{
size_t len;
char *buf;
*path = NULL;
if (session == NULL || __wt_absolute_path(name))
WT_RET(__wt_strndup(session, name, namelen, path));
else {
len = strlen(S2C(session)->home) + 1 + namelen + 1;
WT_RET(__wt_calloc(session, 1, len, &buf));
snprintf(buf, len, "%s%s%.*s", S2C(session)->home,
__wt_path_separator(), (int)namelen, name);
*path = buf;
}
return (0);
}
/*
* __wt_remove_if_exists --
* Remove a file if it exists.
*/
int
__wt_remove_if_exists(WT_SESSION_IMPL *session, const char *name)
{
bool exist;
WT_RET(__wt_exist(session, name, &exist));
if (exist)
WT_RET(__wt_remove(session, name));
return (0);
}
/*
* __wt_rename_and_sync_directory --
* Rename a file and sync the enclosing directory.
*/
int
__wt_rename_and_sync_directory(
WT_SESSION_IMPL *session, const char *from, const char *to)
{
const char *fp, *tp;
bool same_directory;
/* Rename the source file to the target. */
WT_RET(__wt_rename(session, from, to));
/*
* Flush the backing directory to guarantee the rename. My reading of
* POSIX 1003.1 is there's no guarantee flushing only one of the from
* or to directories, or flushing a common parent, is sufficient, and
* even if POSIX were to make that guarantee, existing filesystems are
* known to not provide the guarantee or only provide the guarantee
* with specific mount options. Flush both of the from/to directories
* until it's a performance problem.
*/
WT_RET(__wt_directory_sync(session, from));
/*
* In almost all cases, we're going to be renaming files in the same
* directory, we can at least fast-path that.
*/
fp = strrchr(from, '/');
tp = strrchr(to, '/');
same_directory = (fp == NULL && tp == NULL) ||
(fp != NULL && tp != NULL &&
fp - from == tp - to && memcmp(from, to, (size_t)(fp - from)) == 0);
return (same_directory ? 0 : __wt_directory_sync(session, to));
}
/*
* __wt_fh_sync_and_rename --
* Sync and close a file, and swap it into place.
*/
int
__wt_fh_sync_and_rename(
WT_SESSION_IMPL *session, WT_FH **fhp, const char *from, const char *to)
{
WT_DECL_RET;
WT_FH *fh;
fh = *fhp;
*fhp = NULL;
/* Flush to disk and close the handle. */
ret = __wt_fsync(session, fh);
WT_TRET(__wt_close(session, &fh));
WT_RET(ret);
return (__wt_rename_and_sync_directory(session, from, to));
}
/*
* __wt_sync_fp_and_rename --
* Sync and close a file, and swap it into place.
*/
int
__wt_sync_fp_and_rename(
WT_SESSION_IMPL *session, FILE **fpp, const char *from, const char *to)
{
FILE *fp;
fp = *fpp;
*fpp = NULL;
/* Flush to disk and close the handle. */
WT_RET(__wt_fclose(&fp, WT_FHANDLE_WRITE));
return (__wt_rename_and_sync_directory(session, from, to));
}
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