The unlink option allows the created file to be externally deleted after QEMU is terminated.
- unlink=on|off - default on, unlink the file after opening it Signed-off-by: Antonios Motakis <a.mota...@virtualopensystems.com> Signed-off-by: Nikolay Nikolaev <n.nikol...@virtualopensystems.com> --- exec.c | 18 +++++++++++++----- qemu-options.hx | 7 ++++--- vl.c | 4 ++++ 3 files changed, 21 insertions(+), 8 deletions(-) diff --git a/exec.c b/exec.c index 1c40a0d..30f4019 100644 --- a/exec.c +++ b/exec.c @@ -999,7 +999,7 @@ static void *file_ram_alloc(RAMBlock *block, int flags; unsigned long hpagesize; QemuOpts *opts; - unsigned int mem_prealloc = 0, mem_share = 0; + unsigned int mem_prealloc = 0, mem_share = 0, mem_unlink = 1; hpagesize = gethugepagesize(path); if (!hpagesize) { @@ -1020,6 +1020,7 @@ static void *file_ram_alloc(RAMBlock *block, if (opts) { mem_prealloc = qemu_opt_get_bool(opts, "prealloc", 0); mem_share = qemu_opt_get_bool(opts, "share", 0); + mem_unlink = qemu_opt_get_bool(opts, "unlink", 1); } /* Make name safe to use with mkstemp by replacing '/' with '_'. */ @@ -1029,18 +1030,25 @@ static void *file_ram_alloc(RAMBlock *block, *c = '_'; } - filename = g_strdup_printf("%s/qemu_back_mem.%s.XXXXXX", path, - sanitized_name); + filename = g_strdup_printf("%s/qemu_back_mem.%s%s", path, sanitized_name, + (mem_unlink) ? ".XXXXXX" : ""); g_free(sanitized_name); - fd = mkstemp(filename); + if (mem_unlink) { + fd = mkstemp(filename); + } else { + fd = open(filename, O_CREAT | O_RDWR | O_EXCL, + S_IRWXU | S_IRWXG | S_IRWXO); + } if (fd < 0) { perror("unable to create guest RAM backing store"); g_free(filename); return NULL; } - unlink(filename); + if (mem_unlink) { + unlink(filename); + } g_free(filename); memory = (memory + hpagesize - 1) & ~(hpagesize - 1); diff --git a/qemu-options.hx b/qemu-options.hx index 60ecc95..a12af97 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -221,14 +221,15 @@ gigabytes respectively. ETEXI DEF("mem-path", HAS_ARG, QEMU_OPTION_mempath, - "-mem-path [path=]path[,prealloc=on|off][,share=on|off]\n" + "-mem-path [path=]path[,prealloc=on|off][,share=on|off][,unlink=on|off]\n" " provide backing storage for guest RAM\n" " path= a directory path for the backing store\n" " prealloc= preallocate guest memory [default disabled]\n" - " share= enable mmap share flag [default disabled]\n", + " share= enable mmap share flag [default disabled]\n" + " unlink= enable unlinking the guest RAM files [default enabled]\n", QEMU_ARCH_ALL) STEXI -@item -mem-path [path=]@var{path}[,prealloc=on|off][,share=on|off] +@item -mem-path [path=]@var{path}[,prealloc=on|off][,share=on|off][,unlink=on|off] @findex -mem-path Allocate guest RAM from a temporarily created file in @var{path}. ETEXI diff --git a/vl.c b/vl.c index e98abc8..5034bb6 100644 --- a/vl.c +++ b/vl.c @@ -546,6 +546,10 @@ static QemuOptsList qemu_mem_path_opts = { .name = "share", .type = QEMU_OPT_BOOL, }, + { + .name = "unlink", + .type = QEMU_OPT_BOOL, + }, { /* end of list */ } }, }; -- 1.8.3.2