From 3335b2583490f10c3f273391b48e1e2987022f4c Mon Sep 17 00:00:00 2001 From: Hallvard Furuseth Date: Mon, 23 Sep 2013 20:07:29 +0200 Subject: [PATCH] ITS#7682 mdb_env_copy(): Avoid Linux O_DIRECT bug. Use fcntl() to set the flag. Linux open(,O_DIRECT...) can create the file even on failure, if the filesystem lacks O_DIRECT support. --- libraries/liblmdb/mdb.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c index e30d85c476..46dea53c87 100644 --- a/libraries/liblmdb/mdb.c +++ b/libraries/liblmdb/mdb.c @@ -4246,14 +4246,6 @@ mdb_env_copy(MDB_env *env, const char *path) newfd = CreateFile(lpath, GENERIC_WRITE, 0, NULL, CREATE_NEW, FILE_FLAG_NO_BUFFERING|FILE_FLAG_WRITE_THROUGH, NULL); #else -#ifdef O_DIRECT - /* The OS supports O_DIRECT, try with it */ - newfd = open(lpath, O_WRONLY|O_CREAT|O_EXCL|O_DIRECT, 0666); - /* But open can fail if O_DIRECT isn't supported by the file system - * so retry without the flag - */ - if (newfd == INVALID_HANDLE_VALUE && ErrCode() == EINVAL) -#endif newfd = open(lpath, O_WRONLY|O_CREAT|O_EXCL, 0666); #endif if (newfd == INVALID_HANDLE_VALUE) { @@ -4261,6 +4253,11 @@ mdb_env_copy(MDB_env *env, const char *path) goto leave; } +#ifdef O_DIRECT + /* Set O_DIRECT if the file system supports it */ + if ((rc = fcntl(newfd, F_GETFL)) != -1) + (void) fcntl(newfd, F_SETFL, rc | O_DIRECT); +#endif #ifdef F_NOCACHE /* __APPLE__ */ rc = fcntl(newfd, F_NOCACHE, 1); if (rc) { -- 2.39.2