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Diffstat (limited to 'mkfs.ubifs/mkfs.ubifs.c')
-rw-r--r--mkfs.ubifs/mkfs.ubifs.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/mkfs.ubifs/mkfs.ubifs.c b/mkfs.ubifs/mkfs.ubifs.c
index a306dd6..e3ccb32 100644
--- a/mkfs.ubifs/mkfs.ubifs.c
+++ b/mkfs.ubifs/mkfs.ubifs.c
@@ -132,7 +132,7 @@ static struct inum_mapping **hash_table;
/* Inode creation sequence number */
static unsigned long long creat_sqnum;
-static const char *optstring = "d:r:m:o:D:h?vVe:c:g:f:p:k:x:X:j:R:l:j:UQq";
+static const char *optstring = "d:r:m:o:D:h?vVe:c:g:f:Fp:k:x:X:j:R:l:j:UQq";
static const struct option longopts[] = {
{"root", 1, NULL, 'r'},
@@ -150,6 +150,7 @@ static const struct option longopts[] = {
{"compr", 1, NULL, 'x'},
{"favor-percent", 1, NULL, 'X'},
{"fanout", 1, NULL, 'f'},
+ {"space-fixup", 0, NULL, 'F'},
{"keyhash", 1, NULL, 'k'},
{"log-lebs", 1, NULL, 'l'},
{"orph-lebs", 1, NULL, 'p'},
@@ -183,6 +184,8 @@ static const char *helptext =
" how many percent better zlib should compress to make\n"
" mkfs.ubifs use zlib instead of LZO (default 20%)\n"
"-f, --fanout=NUM fanout NUM (default: 8)\n"
+"-F, --space-fixup file-system free space has to be fixed up on first mount\n"
+" (requires kernel version 2.6.40 or greater)\n"
"-k, --keyhash=TYPE key hash type - \"r5\" or \"test\" (default: \"r5\")\n"
"-p, --orph-lebs=COUNT count of erase blocks for orphans (default: 1)\n"
"-D, --devtable=FILE use device table FILE\n"
@@ -221,7 +224,16 @@ static const char *helptext =
"options were introduced: --squash-rino-perm which preserves the old behavior and\n"
"--nosquash-rino-perm which makes mkfs.ubifs use the right permissions for the root\n"
"inode. Now these options are considered depricated and they will be removed later, so\n"
-"do not use them.\n";
+"do not use them.\n\n"
+"The -F parameter is used to set the \"fix up free space\" flag in the superblock,\n"
+"which forces UBIFS to \"fixup\" all the free space which it is going to use. This\n"
+"option is useful to work-around the problem of double free space programming: if the\n"
+"flasher program which flashes the UBI image is unable to skip NAND pages containing\n"
+"only 0xFF bytes, the effect is that some NAND pages are written to twice - first time\n"
+"when flashing the image and the second time when UBIFS is mounted and writes useful\n"
+"data there. A proper UBI-aware flasher should skip such NAND pages, though. Note, this\n"
+"flag may make the first mount very slow, because the \"free space fixup\" procedure\n"
+"takes time. This feature is supported by the Linux kernel starting from version 2.6.40.\n";
/**
* make_path - make a path name from a directory and a name.
@@ -610,6 +622,9 @@ static int get_options(int argc, char**argv)
if (*endp != '\0' || endp == optarg || c->fanout <= 0)
return err_msg("bad fanout %s", optarg);
break;
+ case 'F':
+ c->space_fixup = 1;
+ break;
case 'l':
c->log_lebs = strtol(optarg, &endp, 0);
if (*endp != '\0' || endp == optarg || c->log_lebs <= 0)
@@ -758,6 +773,7 @@ static int get_options(int argc, char**argv)
"r5" : "test");
printf("\tfanout: %d\n", c->fanout);
printf("\torph_lebs: %d\n", c->orph_lebs);
+ printf("\tspace_fixup: %d\n", c->space_fixup);
}
if (validate_options())
@@ -1997,6 +2013,8 @@ static int write_super(void)
}
if (c->big_lpt)
sup.flags |= cpu_to_le32(UBIFS_FLG_BIGLPT);
+ if (c->space_fixup)
+ sup.flags |= cpu_to_le32(UBIFS_FLG_SPACE_FIXUP);
return write_node(&sup, UBIFS_SB_NODE_SZ, UBIFS_SB_LNUM, UBI_LONGTERM);
}