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| author | Denys Vlasenko | 2009-10-17 23:13:31 +0200 |
|---|---|---|
| committer | Denys Vlasenko | 2009-10-17 23:13:31 +0200 |
| commit | 45887751827cb6316218536937ac846b1b062661 (patch) | |
| tree | 0323abd66015b5dbfb1de7c2c8274056590255cc | |
| parent | 823b4e6f260137bcd72a8b96587ef85a9bd7eac7 (diff) | |
| download | busybox-45887751827cb6316218536937ac846b1b062661.zip busybox-45887751827cb6316218536937ac846b1b062661.tar.gz | |
mkfs_ext2: shrink
function old new delta
has_super 28 25 -3
mkfs_ext2_main 2011 1980 -31
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| -rw-r--r-- | util-linux/mkfs_ext2.c | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/util-linux/mkfs_ext2.c b/util-linux/mkfs_ext2.c index 0f5e014..e4c3e17 100644 --- a/util-linux/mkfs_ext2.c +++ b/util-linux/mkfs_ext2.c @@ -95,14 +95,14 @@ static bool is_power_of(uint32_t x, uint16_t n) return (z == (int)z); } -static bool has_super(uint32_t x) +static uint32_t has_super(uint32_t x) { return (0 == x || 1 == x || is_power_of(x, 3) || is_power_of(x, 5) || is_power_of(x, 7)); } #else -static bool has_super(uint32_t x) +static uint32_t has_super(uint32_t x) { static const uint32_t supers[] = { 0, 1, 3, 5, 7, 9, 25, 27, 49, 81, 125, 243, 343, 625, 729, @@ -112,7 +112,8 @@ static bool has_super(uint32_t x) 48828125, 129140163, 244140625, 282475249, 387420489, 1162261467, 1220703125, 1977326743, 3486784401/* >2^31 */, }; - for (int i = sizeof(supers)/sizeof(supers[0]); --i >= 0; ) + unsigned i; + for (i = ARRAY_SIZE(supers); --i >= 0;) if (x == supers[i]) return 1; return 0; @@ -358,7 +359,7 @@ int mkfs_ext2_main(int argc UNUSED_PARAM, char **argv) i < ngroups; i++, pos += nblocks_per_group, n -= nblocks_per_group ) { - uint32_t overhead = pos + has_super(i) * (1/*sb*/ + gdtsz + rgdtsz); + uint32_t overhead = pos + (has_super(i) ? (1/*sb*/ + gdtsz + rgdtsz) : 0); gd[i].bg_block_bitmap = overhead + 0; gd[i].bg_inode_bitmap = overhead + 1; gd[i].bg_inode_table = overhead + 2; @@ -384,19 +385,21 @@ int mkfs_ext2_main(int argc UNUSED_PARAM, char **argv) // dump filesystem skeleton structures buf = xmalloc(blocksize); for (i = 0, pos = first_data_block; i < ngroups; i++, pos += nblocks_per_group) { - uint32_t overhead = has_super(i) * (1/*sb*/ + gdtsz + rgdtsz); - uint32_t start;// = has_super(i) * (1/*sb*/ + gdtsz + rgdtsz); + uint32_t overhead = has_super(i) ? (1/*sb*/ + gdtsz + rgdtsz) : 0; + uint32_t start;// = has_super(i) ? (1/*sb*/ + gdtsz + rgdtsz) : 0; uint32_t end; // dump superblock and group descriptors and their backups if (overhead) { // N.B. in fact, we want (has_super(i)) condition, but it is equal to (overhead != 0) and is cheaper //bb_info_msg("SUPER@[%d]", pos); // N.B. 1024 byte blocks are special - PUT(blocksize * pos + 1024 * (0 == i && 0 == first_data_block), sb, blocksize); + PUT(blocksize * pos + ((0 == i && 0 == first_data_block) ? 1024 : 0), sb, blocksize); PUT(blocksize * pos + blocksize, gd, (gdtsz + rgdtsz) * blocksize); } - start = overhead + 1/*bbmp*/ + 1/*ibmp*/ + itsz + (0 == i) * 2; // +2: /, /lost+found + start = overhead + 1/*bbmp*/ + 1/*ibmp*/ + itsz; + if (i == 0) + start += 2; // for / and /lost+found end = nblocks_per_group - (start + gd[i].bg_free_blocks_count); // mark preallocated blocks as allocated allocate(buf, blocksize, start, end); |