[git commit master] mkfs_ext2: e2fsck 1.14.4 compat
Denys Vlasenko
vda.linux at googlemail.com
Wed Oct 21 12:01:25 UTC 2009
commit: http://git.busybox.net/busybox/commit/?id=ece01ee8cac0318b96f55085da68799b516406a4
branch: http://git.busybox.net/busybox/commit/?id=refs/heads/master
Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
util-linux/mkfs_ext2.c | 11 ++++---
util-linux/mkfs_ext2.txt | 75 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 81 insertions(+), 5 deletions(-)
create mode 100644 util-linux/mkfs_ext2.txt
diff --git a/util-linux/mkfs_ext2.c b/util-linux/mkfs_ext2.c
index 5cd9238..06858ef 100644
--- a/util-linux/mkfs_ext2.c
+++ b/util-linux/mkfs_ext2.c
@@ -605,16 +605,17 @@ int mkfs_ext2_main(int argc UNUSED_PARAM, char **argv)
PUT(((uint64_t)FETCH_LE32(gd[0].bg_inode_table) * blocksize) + (EXT2_GOOD_OLD_FIRST_INO-1) * sizeof(*inode),
buf, sizeof(*inode));
- // zero the blocks for "/lost+found"
+ // dump directories
memset(buf, 0, blocksize);
+ dir = (struct ext2_dir *)buf;
+
+ // dump 2nd+ blocks of "/lost+found"
+ STORE_LE(dir->rec_len1, blocksize); // e2fsck 1.41.4 compat
for (i = 1; i < lost_and_found_blocks; ++i)
PUT((uint64_t)(FETCH_LE32(gd[0].bg_inode_table) + inode_table_blocks + 1+i) * blocksize,
buf, blocksize);
- // dump directories
- dir = (struct ext2_dir *)buf;
-
- // dump lost+found dir block
+ // dump 1st block of "/lost+found"
STORE_LE(dir->inode1, EXT2_GOOD_OLD_FIRST_INO);
STORE_LE(dir->rec_len1, 12);
STORE_LE(dir->name_len1, 1);
diff --git a/util-linux/mkfs_ext2.txt b/util-linux/mkfs_ext2.txt
new file mode 100644
index 0000000..1eb2d92
--- /dev/null
+++ b/util-linux/mkfs_ext2.txt
@@ -0,0 +1,75 @@
+Difference between bbox mke2fs and standard one (dumpe2fs comparison):
+
+Two significant differences:
+- standard mke2fs has resize_inode feature and thus has reserved GDT blocks,
+ which decreases free blocks;
+- inode size: 128/256 (since 679807k is >0.5G, standard mke2fs uses "big" inodes)
+ this affects inode table in block groups
+
+Filesystem volume name: <none> Filesystem volume name: <none>
+Last mounted on: <not available> Last mounted on: <not available>
+Filesystem UUID: f4839760-c89b-44b7-ac52-08b4e326c0b4 Filesystem UUID: 71179558-8c8e-4a56-ad54-018008f5c358
+Filesystem magic number: 0xEF53 Filesystem magic number: 0xEF53
+Filesystem revision #: 1 (dynamic) Filesystem revision #: 1 (dynamic)
+Filesystem features: ext_attr dir_index filetype sparse_super Filesystem features: ext_attr resize_inode dir_index filetype sparse_super large_file
+Filesystem flags: signed_directory_hash Filesystem flags: signed_directory_hash
+Default mount options: (none) Default mount options: (none)
+Filesystem state: clean Filesystem state: clean
+Errors behavior: Continue Errors behavior: Continue
+Filesystem OS type: Linux Filesystem OS type: Linux
+Inode count: 42624 Inode count: 42528
+Block count: 169951 Block count: 169951
+Reserved block count: 8497 Reserved block count: 8497
+Free blocks: 168594 Free blocks: 167103
+Free inodes: 42613 Free inodes: 42517
+First block: 0 First block: 0
+Block size: 4096 Block size: 4096
+Fragment size: 4096 Fragment size: 4096
+ Reserved GDT blocks: 41
+Blocks per group: 32768 Blocks per group: 32768
+Fragments per group: 32768 Fragments per group: 32768
+Inodes per group: 7104 Inodes per group: 7088
+Inode blocks per group: 222 Inode blocks per group: 443
+Filesystem created: Wed Oct 21 13:40:55 2009 Filesystem created: Wed Oct 21 13:40:55 2009
+Last mount time: n/a Last mount time: n/a
+Last write time: Wed Oct 21 13:40:55 2009 Last write time: Wed Oct 21 13:40:55 2009
+Mount count: 0 Mount count: 0
+Maximum mount count: 20 Maximum mount count: 37
+Last checked: Wed Oct 21 13:40:55 2009 Last checked: Wed Oct 21 13:40:55 2009
+Check interval: 15552000 (6 months) Check interval: 15552000 (6 months)
+Next check after: Mon Apr 19 13:40:55 2010 Next check after: Mon Apr 19 13:40:55 2010
+Reserved blocks uid: 0 (user root) Reserved blocks uid: 0 (user root)
+Reserved blocks gid: 0 (group root) Reserved blocks gid: 0 (group root)
+First inode: 11 First inode: 11
+Inode size: 128 Inode size: 256
+ Required extra isize: 28
+ Desired extra isize: 28
+Default directory hash: half_md4 Default directory hash: half_md4
+Directory Hash Seed: ff94d047-c9ca-4fe5-b553-937a76101a89 Directory Hash Seed: c270fd43-9868-4a92-ae99-050098e12835
+
+
+Group 0: (Blocks 0-32767) Group 0: (Blocks 0-32767)
+ Primary superblock at 0, Group descriptors at 1-1 Primary superblock at 0, Group descriptors at 1-1
+ Reserved GDT blocks at 2-42
+ Block bitmap at 2 (+2), Inode bitmap at 3 (+3) Block bitmap at 43 (+43), Inode bitmap at 44 (+44)
+ Inode table at 4-225 (+4) Inode table at 45-487 (+45)
+ 32537 free blocks, 7093 free inodes, 2 directories 32274 free blocks, 7077 free inodes, 2 directories
+ Free blocks: 231-32767 Free blocks: 494-32767
+ Free inodes: 12-7104 Free inodes: 12-7088
+
+Group 1: (Blocks 32768-65535) Group 1: (Blocks 32768-65535)
+ Backup superblock at 32768, Group descriptors at 32769-32769 Backup superblock at 32768, Group descriptors at 32769-32769
+ Reserved GDT blocks at 32770-32810
+ Block bitmap at 32770 (+2), Inode bitmap at 32771 (+3) Block bitmap at 32811 (+43), Inode bitmap at 32812 (+44)
+ Inode table at 32772-32993 (+4) Inode table at 32813-33255 (+45)
+ 32542 free blocks, 7104 free inodes, 0 directories 32280 free blocks, 7088 free inodes, 0 directories
+ Free blocks: 32994-65535 Free blocks: 33256-65535
+ Free inodes: 7105-14208 Free inodes: 7089-14176
+
+Group 2: (Blocks 65536-98303) Group 2: (Blocks 65536-98303)
+ Block bitmap at 65536 (+0), Inode bitmap at 65537 (+1) Block bitmap at 65536 (+0), Inode bitmap at 65537 (+1)
+ Inode table at 65538-65759 (+2) Inode table at 65538-65980 (+2)
+ 32544 free blocks, 7104 free inodes, 0 directories 32323 free blocks, 7088 free inodes, 0 directories
+ Free blocks: 65760-98303 Free blocks: 65981-98303
+ Free inodes: 14209-21312 Free inodes: 14177-21264
+...
--
1.6.3.3
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