booster: Add stat API

Signed-off-by: Anand V. Avati <avati@amp.gluster.com>

3 files changed, 153 insertions, 2 deletions

diff --git a/booster/src/Makefile.am b/booster/src/Makefile.am
index 9b6e77f95..1b3be737e 100644
--- a/booster/src/Makefile.am
+++ b/booster/src/Makefile.am
@@ -2,7 +2,7 @@ xlatordir = $(libdir)/glusterfs/$(PACKAGE_VERSION)/xlator/performance
 
 ldpreload_PROGRAMS = glusterfs-booster.so
 ldpreloaddir = $(libdir)/glusterfs/
-glusterfs_booster_so_SOURCES = booster.c 
+glusterfs_booster_so_SOURCES = booster.c booster_stat.c
 glusterfs_booster_so_CFLAGS = -I$(top_srcdir)/libglusterfsclient/src/ -D_GNU_SOURCE -D$(GF_HOST_OS) -fPIC -Wall \
 	-pthread $(GF_BOOSTER_CFLAGS)
 glusterfs_booster_so_CPPFLAGS = -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE  \
diff --git a/booster/src/booster.c b/booster/src/booster.c
index ef866cb89..2c2ff0c96 100644
--- a/booster/src/booster.c
+++ b/booster/src/booster.c
@@ -24,7 +24,6 @@
 
 #include <dlfcn.h>
 #include <sys/types.h>
-#include <sys/stat.h>
 #include <sys/uio.h>
 #include <stdio.h>
 #include <stdarg.h>
@@ -171,6 +170,10 @@ static char * (*real_realpath) (const char *path, char *resolved);
 static DIR * (*real_opendir) (const char *path);
 static struct dirent * (*real_readdir) (DIR *dir);
 static int (*real_closedir) (DIR *dh);
+static int (*real___xstat) (int ver, const char *path, struct stat *buf);
+static int (*real___xstat64) (int ver, const char *path, struct stat64 *buf);
+static int (*real_stat) (const char *path, struct stat *buf);
+static int (*real_stat64) (const char *path, struct stat64 *buf);
 
 #define RESOLVE(sym) do {                                       \
                 if (!real_##sym)                                \
@@ -1597,6 +1600,95 @@ out:
         return ret;
 }
 
+/* The real stat functions reside in booster_stat.c to
+ * prevent clash with the statX prototype and functions
+ * declared from sys/stat.h
+ */
+int
+booster_xstat (int ver, const char *path, void *buf)
+{
+        struct stat     *sbuf = (struct stat *)buf;
+        int             ret = -1;
+
+        ret = glusterfs_stat (path, sbuf);
+        if (((ret == -1) && (errno != ENODEV)) || (ret == 0))
+                goto out;
+
+        if (real___xstat == NULL) {
+                ret = -1;
+                errno = ENOSYS;
+                goto out;
+        }
+
+        ret = real___xstat (ver, path, sbuf);
+out:
+        return ret;
+}
+
+int
+booster_xstat64 (int ver, const char *path, void *buf)
+{
+        int             ret = -1;
+        struct stat64   *sbuf = (struct stat64 *)buf;
+
+        ret = glusterfs_stat (path, (struct stat *)sbuf);
+        if (((ret == -1) && (errno != ENODEV)) || (ret == 0))
+                goto out;
+
+        if (real___xstat64 == NULL) {
+                errno = ENOSYS;
+                ret = -1;
+                goto out;
+        }
+
+        ret = real___xstat64 (ver, path, sbuf);
+out:
+        return ret;
+}
+
+int
+booster_stat (const char *path, void *buf)
+{
+        struct stat     *sbuf = (struct stat *)buf;
+        int             ret = -1;
+
+        ret = glusterfs_stat (path, sbuf);
+        if (((ret == -1) && (errno != ENODEV)) || (ret == 0))
+                goto out;
+
+        if (real_stat == NULL) {
+                errno = ENOSYS;
+                ret = -1;
+                goto out;
+        }
+
+        ret = real_stat (path, sbuf);
+
+out:
+        return ret;
+}
+
+int
+booster_stat64 (const char *path, void *buf)
+{
+        int             ret = -1;
+        struct stat64   *sbuf = (struct stat64 *)buf;
+
+        ret = glusterfs_stat (path, (struct stat *)sbuf);
+        if (((ret == -1) && (errno != ENODEV)) || (ret == 0))
+                goto out;
+
+        if (real_stat64 == NULL) {
+                errno = ENOSYS;
+                ret = -1;
+                goto out;
+        }
+
+        ret = real_stat64 (path, sbuf);
+out:
+        return ret;
+}
+
 pid_t 
 fork (void)
 {
@@ -1667,6 +1759,10 @@ _init (void)
         RESOLVE (opendir);
         RESOLVE (readdir);
         RESOLVE (closedir);
+        RESOLVE (__xstat);
+        RESOLVE (__xstat64);
+        RESOLVE (stat);
+        RESOLVE (stat64);
 
         /* This must be called after resolving real functions
          * above so that the socket based IO calls in libglusterfsclient
diff --git a/booster/src/booster_stat.c b/booster/src/booster_stat.c
new file mode 100644
index 000000000..cdf9230e6
--- /dev/null
+++ b/booster/src/booster_stat.c
@@ -0,0 +1,55 @@
+/*
+   Copyright (c) 2007-2009 Z RESEARCH, Inc. <http://www.zresearch.com>
+   This file is part of GlusterFS.
+
+   GlusterFS is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published
+   by the Free Software Foundation; either version 3 of the License,
+   or (at your option) any later version.
+
+   GlusterFS is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see
+   <http://www.gnu.org/licenses/>.
+*/
+
+
+extern int
+booster_stat (const char *path, void *buf);
+
+extern int
+booster_stat64 (const char *path, void *buf);
+
+extern int
+booster_xstat (int ver, const char *path, void *buf);
+
+extern int
+booster_xstat64 (int ver, const char *path, void *buf);
+
+int
+stat (const char *path, void *buf)
+{
+        return booster_stat (path, buf);
+}
+
+int
+stat64 (const char *path, void *buf)
+{
+        return booster_stat64 (path, buf);
+}
+
+int
+__xstat (int ver, const char *path, void *buf)
+{
+        return booster_xstat (ver, path, buf);
+}
+
+int
+__xstat64 (int ver, const char *path, void *buf)
+{
+        return booster_xstat64 (ver, path, buf);
+}