[PATCH 3/8] dumpseg: support opening mounted filesystem by directory pathname

[dexen deVries]

---
 bin/dumpseg.c |   35 +++++++++++++++++++++++++++++------
 1 files changed, 29 insertions(+), 6 deletions(-)

diff --git a/bin/dumpseg.c b/bin/dumpseg.c
index 0ee6aee..1910296 100644
--- a/bin/dumpseg.c
+++ b/bin/dumpseg.c
@@ -28,6 +28,14 @@
 #include "config.h"
 #endif /* HAVE_CONFIG_H */
 
+#if HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif /* HAVE_SYS_TYPES_H */
+
+#if HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif /* HAVE_SYS_STAT_H */
+
 #include <stdio.h>
 
 #if HAVE_STDLIB_H
@@ -169,17 +177,19 @@ static void dumpseg_print_segment(struct nilfs *nilfs,
 int main(int argc, char *argv[])
 {
        struct nilfs *nilfs;
+       struct stat statbuf;
        __u64 segnum;
-       char *dev, *endptr, *progname;
+       char *dev, *dir, *pathname, *endptr, *progname;
        void *seg;
        ssize_t segsize;
-       int c, i, status;
+       int c, i, status, ret;
        unsigned long val;
 #ifdef _GNU_SOURCE
        int option_index;
 #endif /* _GNU_SOURCE */
 
        opterr = 0;
+       dev = dir = NULL;
 
        if ((progname = strrchr(argv[0], '/')) == NULL)
                progname = argv[0];
@@ -214,14 +224,27 @@ int main(int argc, char *argv[])
        } else {
                val = strtoul(argv[optind], &endptr, DUMPSEG_BASE);
                if (*endptr == '\0')
-                       dev = NULL;
+                       pathname = NULL;
                else
-                       dev = argv[optind++];
+                       pathname = argv[optind++];
        }
 
-       nilfs = nilfs_open(dev, NULL, NILFS_OPEN_RAW);
+
+       if (pathname) {
+               ret = stat(pathname, &statbuf);
+               if (ret == -1) {
+                       fprintf(stderr, "%s: cannot open %s: %s\n",
+                               progname, pathname, strerror(errno));
+                       exit(EXIT_FAILURE);
+               }
+               if (S_ISDIR(statbuf.st_mode))
+                       dir = pathname;
+               else
+                       dev = pathname;
+       }
+       nilfs = nilfs_open(dev, dir, NILFS_OPEN_RAW);
        if (nilfs == NULL) {
-               fprintf(stderr, "%s: %s: cannot open NILFS\n", progname, dev);
+               fprintf(stderr, "%s: %s: cannot open NILFS\n", progname, 
pathname);
                exit(1);
        }
 
-- 
1.7.4.1

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