----- Original Message ----- > On 15.09.2015 19:07, marcandre.lur...@redhat.com wrote: > > From: Marc-André Lureau <marcandre.lur...@redhat.com> > > > > As pointed out on the ML by Andrew Jones, glibc no longer permits > > creating POSIX shm on hugetlbfs directly. When given a hugetlbfs path, > > create a shareable file there. > > > > Signed-off-by: Marc-André Lureau <marcandre.lur...@redhat.com> > > --- > > contrib/ivshmem-server/ivshmem-server.c | 40 > > ++++++++++++++++++++++++++++++++- > > contrib/ivshmem-server/ivshmem-server.h | 3 +-- > > contrib/ivshmem-server/main.c | 5 ++--- > > 3 files changed, 42 insertions(+), 6 deletions(-) > > > > diff --git a/contrib/ivshmem-server/ivshmem-server.c > > b/contrib/ivshmem-server/ivshmem-server.c > > index 972fda2..51264b4 100644 > > --- a/contrib/ivshmem-server/ivshmem-server.c > > +++ b/contrib/ivshmem-server/ivshmem-server.c > > @@ -11,6 +11,7 @@ > > #include <sys/socket.h> > > #include <sys/un.h> > > #include <sys/eventfd.h> > > +#include <sys/vfs.h> > > > > #include "qemu-common.h" > > #include "qemu/queue.h" > > @@ -271,15 +272,52 @@ ivshmem_server_init(IvshmemServer *server, const char > > *unix_sock_path, > > return 0; > > } > > > > +#define HUGETLBFS_MAGIC 0x958458f6 > > + > > +static long gethugepagesize(const char *path) > > +{ > > + struct statfs fs; > > + int ret; > > + > > + do { > > + ret = statfs(path, &fs); > > + } while (ret != 0 && errno == EINTR); > > + > > + if (ret != 0) { > > + if (errno != ENOENT) { > > + fprintf(stderr, "cannot stat shm file %s: %s\n", path, > > + strerror(errno)); > > + } > > + return -1; > > + } > > + > > + if (fs.f_type != HUGETLBFS_MAGIC) { > > should it be silent?
Well, the same given path may be shm name or a hugefs. I guess we could use a different argument instead and make sure that it is hugefs. At the minimum, I understand we may want a warning here. > > + return -1; > > + } > > + > > + return fs.f_bsize; > > +} > > + > > /* open shm, create and bind to the unix socket */ > > int > > ivshmem_server_start(IvshmemServer *server) > > { > > struct sockaddr_un sun; > > int shm_fd, sock_fd, ret; > > + long hpagesize; > > + gchar *filename; > > > > /* open shm file */ > > - shm_fd = shm_open(server->shm_path, O_CREAT|O_RDWR, S_IRWXU); > > + hpagesize = gethugepagesize(server->shm_path); > > + if (hpagesize > 0) { > > filename is used only in this block, it may be defined here. ok > > > + filename = g_strdup_printf("%s/ivshmem.XXXXXX", server->shm_path); > > + shm_fd = mkstemp(filename); > > + unlink(filename); > > + g_free(filename); > > + } else { > > + shm_fd = shm_open(server->shm_path, O_CREAT|O_RDWR, S_IRWXU); > > + } > > + > > if (shm_fd < 0) { > > fprintf(stderr, "cannot open shm file %s: %s\n", > > server->shm_path, > > strerror(errno)); > > diff --git a/contrib/ivshmem-server/ivshmem-server.h > > b/contrib/ivshmem-server/ivshmem-server.h > > index 2176d5e..e9b0e7a 100644 > > --- a/contrib/ivshmem-server/ivshmem-server.h > > +++ b/contrib/ivshmem-server/ivshmem-server.h > > @@ -81,8 +81,7 @@ typedef struct IvshmemServer { > > * @server: A pointer to an uninitialized IvshmemServer structure > > * @unix_sock_path: The pointer to the unix socket file name > > * @shm_path: Path to the shared memory. The path corresponds to a > > POSIX > > - * shm name. To use a real file, for instance in a > > hugetlbfs, > > - * it is possible to use /../../abspath/to/file. > > + * shm name or a hugetlbfs mount point. > > * @shm_size: Size of shared memory > > * @n_vectors: Number of interrupt vectors per client > > * @verbose: True to enable verbose mode > > diff --git a/contrib/ivshmem-server/main.c b/contrib/ivshmem-server/main.c > > index 84ffc4d..cd8d9ed 100644 > > --- a/contrib/ivshmem-server/main.c > > +++ b/contrib/ivshmem-server/main.c > > @@ -47,9 +47,8 @@ ivshmem_server_usage(const char *name, int code) > > " to listen to.\n" > > " Default=%s\n", > > IVSHMEM_SERVER_DEFAULT_UNIX_SOCK_PATH); > > fprintf(stderr, " -m <shm_path>: path to the shared memory.\n" > > - " The path corresponds to a POSIX shm name. To use > > a\n" > > - " real file, for instance in a hugetlbfs, use\n" > > - " /../../abspath/to/file.\n" > > + " The path corresponds to a POSIX shm name or a\n" > > + " hugetlbfs mount point.\n" > > " default=%s\n", > > IVSHMEM_SERVER_DEFAULT_SHM_PATH); > > fprintf(stderr, " -l <size>: size of shared memory in bytes. The > > suffix\n" > > " K, M and G can be used (ex: 1K means 1024).\n" > > > -- > Best regards, > Vladimir > * now, @virtuozzo.com instead of @parallels.com. Sorry for this > inconvenience. > >