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-rw-r--r--mkfs.jffs2.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/mkfs.jffs2.c b/mkfs.jffs2.c
index 2228ee1..2f2c371 100644
--- a/mkfs.jffs2.c
+++ b/mkfs.jffs2.c
@@ -706,9 +706,9 @@ static unsigned char ffbuf[16] =
0xff, 0xff, 0xff, 0xff, 0xff
};
-/* We default to 4096, per x86. When building a fs for
- * 64-bit arches and whatnot, use the --pagesize=SIZE option */
-int page_size = 4096;
+/* We set this at start of main() using sysconf(), -1 means we don't know */
+/* When building an fs for non-native systems, use --pagesize=SIZE option */
+int page_size = -1;
#include "compr.h"
@@ -1660,9 +1660,16 @@ int main(int argc, char **argv)
struct filesystem_entry *root;
char *compr_name = NULL;
int compr_prior = -1;
+ int warn_page_size = 0;
jffs2_compressors_init();
+ page_size = sysconf(_SC_PAGESIZE);
+ if (page_size < 0) /* System doesn't know so ... */
+ page_size = 4096; /* ... we make an educated guess */
+ if (page_size != 4096)
+ warn_page_size = 1; /* warn user if page size not 4096 */
+
while ((opt = getopt_long(argc, argv,
"D:d:r:s:o:qUPfh?vVe:lbp::nc:m:x:X:Lty:i:", long_options, &c)) >= 0)
{
@@ -1685,6 +1692,7 @@ int main(int argc, char **argv)
case 's':
page_size = strtol(optarg, NULL, 0);
+ warn_page_size = 0; /* set by user, so don't need to warn */
break;
case 'o':
@@ -1843,6 +1851,10 @@ int main(int argc, char **argv)
#endif
}
}
+ if (warn_page_size) {
+ error_msg("Page size for this system is by default %d", page_size);
+ error_msg("Use the --pagesize=SIZE option if this is not what you want");
+ }
if (out_fd == -1) {
if (isatty(1)) {
error_msg_and_die(helptext);