On Wed, Apr 29, 2009 at 05:56:26PM -0400, Kevin Coffman wrote:
> From: Olga Kornievskaia <aglo@xxxxxxxxxxxxxx>
>
> Add support for handling upcalls on the new "nfsd4_cb" directory pipes.
> Only new kernels (2.6.29) have support for this new pipe directory.
> (The need for this new pipe directory will go away with NFSv4.1 where
> the callback can be done on the same connection as the fore-channel.)
My only complaint is that the code would be robust (and more
future-proof) if instead of specifically looking for "nfs" and
"nfsd4_cb", we just look at all top-level rpc_pipefs directories and
handed directories under any of them in the same way.
--b.
>
> Signed-off-by: Olga Kornievskaia <aglo@xxxxxxxxxxxxxx>
> Signed-off-by: Kevin Coffman <kwc@xxxxxxxxxxxxxx>
> ---
>
> utils/gssd/gssd.c | 5 +++
> utils/gssd/gssd.h | 2 +
> utils/gssd/gssd_main_loop.c | 18 ++++++++++-
> utils/gssd/gssd_proc.c | 73 +++++++++++++++++++++++++++++--------------
> 4 files changed, 74 insertions(+), 24 deletions(-)
>
> diff --git a/utils/gssd/gssd.c b/utils/gssd/gssd.c
> index f6949db..7a23362 100644
> --- a/utils/gssd/gssd.c
> +++ b/utils/gssd/gssd.c
> @@ -57,6 +57,7 @@
>
> char pipefs_dir[PATH_MAX] = GSSD_PIPEFS_DIR;
> char pipefs_nfsdir[PATH_MAX] = GSSD_PIPEFS_DIR;
> +char pipefs_nfscbdir[PATH_MAX] = GSSD_PIPEFS_DIR;
> char keytabfile[PATH_MAX] = GSSD_DEFAULT_KEYTAB_FILE;
> char ccachedir[PATH_MAX] = GSSD_DEFAULT_CRED_DIR;
> char *ccachesearch[GSSD_MAX_CCACHE_SEARCH + 1];
> @@ -163,6 +164,10 @@ main(int argc, char *argv[])
> pipefs_dir, GSSD_SERVICE_NAME);
> if (pipefs_nfsdir[sizeof(pipefs_nfsdir)-1] != '\0')
> errx(1, "pipefs_nfsdir path name too long");
> + snprintf(pipefs_nfscbdir, sizeof(pipefs_nfscbdir), "%s/%s",
> + pipefs_dir, GSSD_NFSCB_NAME);
> + if (pipefs_nfscbdir[sizeof(pipefs_nfscbdir)-1] != '\0')
> + errx(1, "pipefs_nfscbdir path name too long");
>
> if ((progname = strrchr(argv[0], '/')))
> progname++;
> diff --git a/utils/gssd/gssd.h b/utils/gssd/gssd.h
> index 3c52f46..ef2ac54 100644
> --- a/utils/gssd/gssd.h
> +++ b/utils/gssd/gssd.h
> @@ -49,6 +49,7 @@
> #define GSSD_DEFAULT_MACHINE_CRED_SUFFIX "machine"
> #define GSSD_DEFAULT_KEYTAB_FILE "/etc/krb5.keytab"
> #define GSSD_SERVICE_NAME "nfs"
> +#define GSSD_NFSCB_NAME "nfsd4_cb"
> #define GSSD_SERVICE_NAME_LEN 3
> #define GSSD_MAX_CCACHE_SEARCH 16
>
> @@ -61,6 +62,7 @@ enum {AUTHTYPE_KRB5, AUTHTYPE_SPKM3, AUTHTYPE_LIPKEY};
>
> extern char pipefs_dir[PATH_MAX];
> extern char pipefs_nfsdir[PATH_MAX];
> +extern char pipefs_nfscbdir[PATH_MAX];
> extern char keytabfile[PATH_MAX];
> extern char *ccachesearch[];
> extern int use_memcache;
> diff --git a/utils/gssd/gssd_main_loop.c b/utils/gssd/gssd_main_loop.c
> index 397fd14..1c1ff4f 100644
> --- a/utils/gssd/gssd_main_loop.c
> +++ b/utils/gssd/gssd_main_loop.c
> @@ -103,7 +103,7 @@ gssd_run()
> {
> int ret;
> struct sigaction dn_act;
> - int fd;
> + int fd, fd_cb;
> sigset_t set;
>
> /* Taken from linux/Documentation/dnotify.txt: */
> @@ -125,6 +125,20 @@ gssd_run()
> fcntl(fd, F_SETSIG, DNOTIFY_SIGNAL);
> fcntl(fd, F_NOTIFY, DN_CREATE|DN_DELETE|DN_MODIFY|DN_MULTISHOT);
>
> + /* Attempt to open new callback pipe. If the open fails,
> + * don't try to process it. */
> + if ((fd_cb = open(pipefs_nfscbdir, O_RDONLY)) == -1) {
> + /* could be an older kernel or a newer one doing NFS 4.1 */
> + if (errno != ENOENT)
> + printerr(0, "WARNING: failed to open %s: %s\n",
> + pipefs_nfscbdir, strerror(errno));
> + memset(pipefs_nfscbdir, '\0', sizeof(pipefs_nfscbdir));
> + } else {
> + fcntl(fd_cb, F_SETSIG, DNOTIFY_SIGNAL);
> + fcntl(fd_cb, F_NOTIFY,
> + DN_CREATE|DN_DELETE|DN_MODIFY|DN_MULTISHOT);
> + }
> +
> init_client_list();
>
> printerr(1, "beginning poll\n");
> @@ -151,5 +165,7 @@ gssd_run()
> }
> }
> close(fd);
> + if (fd_cb != -1)
> + close(fd_cb);
> return;
> }
> diff --git a/utils/gssd/gssd_proc.c b/utils/gssd/gssd_proc.c
> index 0fc0c42..969d113 100644
> --- a/utils/gssd/gssd_proc.c
> +++ b/utils/gssd/gssd_proc.c
> @@ -232,11 +232,19 @@ read_service_info(char *info_file_name, char **servicename, char **servername,
> sscanf(p, "port: %127s\n", cb_port);
>
> /* check service, program, and version */
> - if(memcmp(service, "nfs", 3)) return -1;
> + if (memcmp(service, "nfs", 3) != 0)
> + return -1;
> *prog = atoi(program + 1); /* skip open paren */
> *vers = atoi(version);
> - if((*prog != 100003) || ((*vers != 2) && (*vers != 3) && (*vers != 4)))
> - goto fail;
> +
> + if (strlen(service) == 3 ) {
> + if ((*prog != 100003) || ((*vers != 2) && (*vers != 3) &&
> + (*vers != 4)))
> + goto fail;
> + } else if (memcmp(service, "nfs4_cb", 7) == 0) {
> + if (*vers != 1)
> + goto fail;
> + }
>
> if (cb_port[0] != '\0') {
> port = atoi(cb_port);
> @@ -315,19 +323,18 @@ out:
> static int
> process_clnt_dir_files(struct clnt_info * clp)
> {
> - char kname[32];
> - char sname[32];
> - char info_file_name[32];
> + char name[PATH_MAX];
> + char info_file_name[PATH_MAX];
>
> if (clp->krb5_fd == -1) {
> - snprintf(kname, sizeof(kname), "%s/krb5", clp->dirname);
> - clp->krb5_fd = open(kname, O_RDWR);
> + snprintf(name, sizeof(name), "%s/krb5", clp->dirname);
> + clp->krb5_fd = open(name, O_RDWR);
> }
> if (clp->spkm3_fd == -1) {
> - snprintf(sname, sizeof(sname), "%s/spkm3", clp->dirname);
> - clp->spkm3_fd = open(sname, O_RDWR);
> + snprintf(name, sizeof(name), "%s/spkm3", clp->dirname);
> + clp->spkm3_fd = open(name, O_RDWR);
> }
> - if((clp->krb5_fd == -1) && (clp->spkm3_fd == -1))
> + if ((clp->krb5_fd == -1) && (clp->spkm3_fd == -1))
> return -1;
> snprintf(info_file_name, sizeof(info_file_name), "%s/info",
> clp->dirname);
> @@ -384,17 +391,18 @@ insert_clnt_poll(struct clnt_info *clp)
> }
>
> static void
> -process_clnt_dir(char *dir)
> +process_clnt_dir(char *dir, char *pdir)
> {
> struct clnt_info * clp;
>
> if (!(clp = insert_new_clnt()))
> goto fail_destroy_client;
>
> - if (!(clp->dirname = calloc(strlen(dir) + 1, 1))) {
> + /* An extra for the '/', and an extra for the null */
> + if (!(clp->dirname = calloc(strlen(dir) + strlen(pdir) + 2, 1))) {
> goto fail_destroy_client;
> }
> - memcpy(clp->dirname, dir, strlen(dir));
> + sprintf(clp->dirname, "%s/%s", pdir, dir);
> if ((clp->dir_fd = open(clp->dirname, O_RDONLY)) == -1) {
> printerr(0, "ERROR: can't open %s: %s\n",
> clp->dirname, strerror(errno));
> @@ -438,16 +446,24 @@ init_client_list(void)
> * directories, since the DNOTIFY could have been in there.
> */
> static void
> -update_old_clients(struct dirent **namelist, int size)
> +update_old_clients(struct dirent **namelist, int size, char *pdir)
> {
> struct clnt_info *clp;
> void *saveprev;
> int i, stillhere;
> + char fname[PATH_MAX];
>
> for (clp = clnt_list.tqh_first; clp != NULL; clp = clp->list.tqe_next) {
> + /* only compare entries in the global list that are from the
> + * same pipefs parent directory as "pdir"
> + */
> + if (strncmp(clp->dirname, pdir, strlen(pdir)) != 0) continue;
> +
> stillhere = 0;
> for (i=0; i < size; i++) {
> - if (!strcmp(clp->dirname, namelist[i]->d_name)) {
> + snprintf(fname, sizeof(fname), "%s/%s",
> + pdir, namelist[i]->d_name);
> + if (strcmp(clp->dirname, fname) == 0) {
> stillhere = 1;
> break;
> }
> @@ -468,13 +484,16 @@ update_old_clients(struct dirent **namelist, int size)
>
> /* Search for a client by directory name, return 1 if found, 0 otherwise */
> static int
> -find_client(char *dirname)
> +find_client(char *dirname, char *pdir)
> {
> struct clnt_info *clp;
> + char fname[PATH_MAX];
>
> - for (clp = clnt_list.tqh_first; clp != NULL; clp = clp->list.tqe_next)
> - if (!strcmp(clp->dirname, dirname))
> + for (clp = clnt_list.tqh_first; clp != NULL; clp = clp->list.tqe_next) {
> + snprintf(fname, sizeof(fname), "%s/%s", pdir, dirname);
> + if (strcmp(clp->dirname, fname) == 0)
> return 1;
> + }
> return 0;
> }
>
> @@ -497,12 +516,12 @@ process_pipedir(char *pipe_name)
> return -1;
> }
>
> - update_old_clients(namelist, j);
> + update_old_clients(namelist, j, pipe_name);
> for (i=0; i < j; i++) {
> if (i < FD_ALLOC_BLOCK
> && !strncmp(namelist[i]->d_name, "clnt", 4)
> - && !find_client(namelist[i]->d_name))
> - process_clnt_dir(namelist[i]->d_name);
> + && !find_client(namelist[i]->d_name, pipe_name))
> + process_clnt_dir(namelist[i]->d_name, pipe_name);
> free(namelist[i]);
> }
>
> @@ -510,7 +529,6 @@ process_pipedir(char *pipe_name)
>
> return 0;
> }
> -
> /* Used to read (and re-read) list of clients, set up poll array. */
> int
> update_client_list(void)
> @@ -521,6 +539,15 @@ update_client_list(void)
> if (retval)
> printerr(0, "ERROR: processing %s\n", pipefs_nfsdir);
>
> + /* If we successfully processed nfsdir and callback directory exists
> + * process any events in the callback directory
> + */
> + if (retval == 0 && pipefs_nfscbdir[0] != '\0') {
> + retval = process_pipedir(pipefs_nfscbdir);
> + if (retval)
> + printerr(0, "ERROR: processing %s\n", pipefs_nfscbdir);
> + }
> +
> return retval;
> }
>
>
> --
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