diff options
Diffstat (limited to 'mkfs.ubifs/mkfs.ubifs.c')
| -rw-r--r-- | mkfs.ubifs/mkfs.ubifs.c | 22 |
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); } |