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c11fb47 |
commit ec08843916d07c28045398e5b17e7347a8fa0135
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c11fb47 |
Author: Steve Dickson <steved@redhat.com>
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c11fb47 |
Date: Fri May 11 12:13:06 2007 -0400
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c11fb47 |
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c11fb47 |
nfs-utils: have mountd hold open etab file to force inode number to change
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c11fb47 |
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c11fb47 |
This patch changes mountd to hold the etab file open so that when it's
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c11fb47 |
changed by exportfs, the inode number should change. We then change
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c11fb47 |
auth_reload to reload the file based on whether st_ino is different
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c11fb47 |
from the last time it was checked. It also changes auth_reload to
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c11fb47 |
maintain a static counter value and return it instead of a timestamp
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c11fb47 |
and fixes up get_exportlist accordingly. Finally, it adds some
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c11fb47 |
comments to xtab_write to warn people about editing the etab in place.
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c11fb47 |
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c11fb47 |
Signed-off-by: Jeff Layton <jlayton@redhat.com>
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c11fb47 |
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c11fb47 |
Signed-off-by: Steve Dickson <steved@redhat.com>
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c11fb47 |
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c11fb47 |
diff --git a/support/export/xtab.c b/support/export/xtab.c
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c11fb47 |
index 0ddb251..292087b 100644
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c11fb47 |
--- a/support/export/xtab.c
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c11fb47 |
+++ b/support/export/xtab.c
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c11fb47 |
@@ -80,6 +80,12 @@ xtab_export_read(void)
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c11fb47 |
return xtab_read(_PATH_ETAB, 1);
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c11fb47 |
}
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c11fb47 |
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c11fb47 |
+/*
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c11fb47 |
+ * mountd now keeps an open fd for the etab at all times to make sure that the
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c11fb47 |
+ * inode number changes when the xtab_export_write is done. If you change the
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c11fb47 |
+ * routine below such that the files are edited in place, then you'll need to
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c11fb47 |
+ * fix the auth_reload logic as well...
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c11fb47 |
+ */
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c11fb47 |
static int
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c11fb47 |
xtab_write(char *xtab, char *xtabtmp, int is_export)
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c11fb47 |
{
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c11fb47 |
diff --git a/utils/mountd/auth.c b/utils/mountd/auth.c
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c11fb47 |
index 183c9ea..f7fe23d 100644
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c11fb47 |
--- a/utils/mountd/auth.c
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c11fb47 |
+++ b/utils/mountd/auth.c
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c11fb47 |
@@ -14,6 +14,7 @@
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c11fb47 |
#include <netinet/in.h>
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c11fb47 |
#include <arpa/inet.h>
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c11fb47 |
#include <errno.h>
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c11fb47 |
+#include <unistd.h>
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c11fb47 |
#include "misc.h"
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c11fb47 |
#include "nfslib.h"
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c11fb47 |
#include "exportfs.h"
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c11fb47 |
@@ -46,24 +47,34 @@ auth_init(char *exports)
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c11fb47 |
xtab_mount_write();
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c11fb47 |
}
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c11fb47 |
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c11fb47 |
-time_t
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c11fb47 |
+unsigned int
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c11fb47 |
auth_reload()
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c11fb47 |
{
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c11fb47 |
struct stat stb;
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c11fb47 |
- static time_t last_modified = 0;
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c11fb47 |
-
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c11fb47 |
- if (stat(_PATH_ETAB, &stb) < 0)
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c11fb47 |
+ static ino_t last_inode;
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c11fb47 |
+ static int last_fd;
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c11fb47 |
+ static unsigned int counter;
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c11fb47 |
+ int fd;
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c11fb47 |
+
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c11fb47 |
+ if ((fd = open(_PATH_ETAB, O_RDONLY)) < 0) {
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c11fb47 |
+ xlog(L_FATAL, "couldn't open %s", _PATH_ETAB);
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c11fb47 |
+ } else if (fstat(fd, &stb) < 0) {
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c11fb47 |
xlog(L_FATAL, "couldn't stat %s", _PATH_ETAB);
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c11fb47 |
- if (stb.st_mtime == last_modified)
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c11fb47 |
- return last_modified;
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c11fb47 |
- last_modified = stb.st_mtime;
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c11fb47 |
+ } else if (stb.st_ino == last_inode) {
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c11fb47 |
+ close(fd);
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c11fb47 |
+ return counter;
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c11fb47 |
+ } else {
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c11fb47 |
+ close(last_fd);
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c11fb47 |
+ last_fd = fd;
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c11fb47 |
+ last_inode = stb.st_ino;
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c11fb47 |
+ }
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c11fb47 |
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c11fb47 |
export_freeall();
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c11fb47 |
memset(&my_client, 0, sizeof(my_client));
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c11fb47 |
- // export_read(export_file);
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c11fb47 |
xtab_export_read();
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c11fb47 |
+ ++counter;
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c11fb47 |
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c11fb47 |
- return last_modified;
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c11fb47 |
+ return counter;
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}
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static nfs_export *
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diff --git a/utils/mountd/mountd.c b/utils/mountd/mountd.c
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index fc9a73c..09cab84 100644
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--- a/utils/mountd/mountd.c
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+++ b/utils/mountd/mountd.c
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@@ -465,18 +465,18 @@ static exports
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get_exportlist(void)
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![](https://seccdn.libravatar.org/avatar/79dde3aae8e74a087a9437286a490898715b52e98b8655cac3f971ab0a473044?s=16&d=retro) |
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{
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static exports elist = NULL;
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- static time_t etime = 0;
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- time_t atime;
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struct exportnode *e, *ne;
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struct groupnode *g, *ng, *c, **cp;
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nfs_export *exp;
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int i;
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+ static unsigned int ecounter;
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+ unsigned int acounter;
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- atime = auth_reload();
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- if (elist && atime == etime)
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+ acounter = auth_reload();
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+ if (elist && acounter == ecounter)
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return elist;
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- etime = atime;
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+ ecounter = acounter;
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for (e = elist; e != NULL; e = ne) {
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ne = e->ex_next;
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diff --git a/utils/mountd/mountd.h b/utils/mountd/mountd.h
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index b539278..31bacb5 100644
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--- a/utils/mountd/mountd.h
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+++ b/utils/mountd/mountd.h
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@@ -40,7 +40,7 @@ bool_t mount_mnt_3_svc(struct svc_req *, dirpath *, mountres3 *);
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void mount_dispatch(struct svc_req *, SVCXPRT *);
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void auth_init(char *export_file);
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-time_t auth_reload(void);
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+unsigned int auth_reload(void);
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nfs_export * auth_authenticate(char *what, struct sockaddr_in *sin,
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char *path);
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void auth_export(nfs_export *exp);
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