contrib: add ext4-ioc.c

Add a debugging program which allows calling ext4-specific ioctls on
files.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/contrib/ext4-ioc.c b/contrib/ext4-ioc.c
new file mode 100644 (file)
index 0000000..42f022d
--- /dev/null
+++ b/contrib/ext4-ioc.c
@@ -0,0 +1,98 @@
+/*
+ * Test program to trigger various ext4 ioctl's
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+#if (!defined(EXT4_IOC_ALLOC_DA_BLKS) && defined(__linux__))
+#define EXT4_IOC_ALLOC_DA_BLKS         _IO('f', 12)
+#endif
+
+#if (!defined(EXT4_IOC_SWAP_BOOT) && defined(__linux__))
+#define EXT4_IOC_SWAP_BOOT             _IO('f', 17)
+#endif
+
+#if (!defined(EXT4_IOC_PRECACHE_EXTENTS) && defined(__linux__))
+#define EXT4_IOC_PRECACHE_EXTENTS      _IO('f', 18)
+#endif
+
+#if (!defined(EXT4_IOC_CLEAR_ES_CACHE) && defined(__linux__))
+#define EXT4_IOC_CLEAR_ES_CACHE                _IO('f', 40)
+#endif
+
+
+#define EXT4_F_RW      0x0001
+
+struct cmd {
+       const char      *cmd;
+       unsigned long   ioc;
+       int             flags;
+};
+
+struct cmd cmds[] = {
+       { "alloc_da_blks", EXT4_IOC_ALLOC_DA_BLKS, EXT4_F_RW },
+       { "precache", EXT4_IOC_PRECACHE_EXTENTS, 0 },
+       { "swap_boot", EXT4_IOC_SWAP_BOOT, EXT4_F_RW },
+       { "clear_es_cache", EXT4_IOC_CLEAR_ES_CACHE, EXT4_F_RW },
+       { NULL, 0 }
+};
+
+const char *progname;
+
+void usage()
+{
+       struct cmd *p;
+
+       fprintf(stderr, "Usage: %s <cmd> <file>\n\n", progname);
+       fprintf(stderr, "Available commands:\n");
+       for (p = cmds; p->cmd; p++) {
+               fprintf(stderr, "\t%s\n", p->cmd);
+       }
+       exit(1);
+}
+
+int do_single_cmd(const char *fn, struct cmd *p)
+{
+       int     fd;
+       int     oflags = O_RDONLY;
+
+       if (p->flags & EXT4_F_RW)
+               oflags = O_RDWR;
+       fd = open(fn, oflags, 0);
+       if (fd < 0) {
+               perror("open");
+               return 1;
+       }
+       if (ioctl(fd, p->ioc) < 0) {
+               perror("ioctl");
+               return 1;
+       }
+       close(fd);
+       return 0;
+}
+
+int main(int argc, char **argv)
+{
+       int     i, fails = 0;
+       struct cmd *p;
+
+       progname = argv[0];
+       if (argc < 3 || strcmp(argv[1], "help") == 0)
+               usage();
+       for (p = cmds; p->cmd; p++) {
+               if (strcmp(argv[1], p->cmd) == 0)
+                       break;
+       }
+       if (p->cmd == NULL) {
+               fprintf(stderr, "Invalid command: %s\n", argv[1]);
+               usage();
+       }
+       for (i = 2; i < argc; i++)
+               fails += do_single_cmd(argv[i], p);
+       return fails;
+}