On Tue, Mar 8, 2011 at 10:26 PM, Joseph D. Wagner <[email protected] > wrote:
> Are you sure it's capital T and not lowercase t? > > From man: > -t fs-type > Specify the filesystem type (i.e., ext2, ext3, ext4, etc.) > that is to be created. If this option is not > specified, mke2fs will pick a default either via how the > command was run (for example, using a name of the > form mkfs.ext2, mkfs.ext3, etc.) or via a default as defined > by the /etc/mke2fs.conf(5) file. This option > controls which filesystem options are used by default, > based on the fstypes configuration stanza in > /etc/mke2fs.conf(5). > > If the -O option is used to explicitly add or remove > filesystem options that should be set in the newly > created filesystem, the resulting filesystem may not be > supported by the requested fs-type. (e.g., "mke2fs > -t ext3 -O extents /dev/sdXX" will create a filesystem that is > not supported by the ext3 implementation as > found in the Linux kernel; and "mke2fs -t ext3 -O > ^has_journal /dev/hdXX" will create a filesystem that > does not have a journal and hence will not be supported by the > ext3 filesystem code in the Linux kernel.) > > -T usage-type[,...] > Specify how the filesystem is going to be used, so that mke2fs > can choose optimal filesystem parameters for > that use. The usage types that are supported are defined > in the configuration file /etc/mke2fs.conf(5). > The user may specify one or more usage types using a comma > separated list. > > If this option is is not specified, mke2fs will pick a single > default usage type based on the size of the > filesystem to be created. If the filesystem size is less than > or equal to 3 megabytes, mke2fs will use the > filesystem type floppy. If the filesystem size is greater > than 3 but less than or equal to 512 megabytes, > mke2fs(8) will use the filesystem small. Otherwise, > mke2fs(8) will use the default filesystem type > default. Below are the reports from dumpe2fs 1.41.12 (17-May-2010) on Fedora-14 (2.6.35.11-83.fc14.x86_64) of a 200 MiB image file. The block sizes are 4096 bytes with -T and 1024 with -t. Which would be preferred? -T (mke2fs -F -j -T ext4 home.img): Filesystem volume name: <none> Last mounted on: <not available> Filesystem UUID: eb1e7223-73bf-46db-a84e-6c2a53120d65 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize Filesystem flags: signed_directory_hash Default mount options: user_xattr acl Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 12800 Block count: 51200 Reserved block count: 2560 Free blocks: 46266 Free inodes: 12789 First block: 0 Block size: 4096 Fragment size: 4096 Reserved GDT blocks: 12 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 6400 Inode blocks per group: 400 Flex block group size: 16 Filesystem created: Wed Mar 9 19:20:44 2011 Last mount time: Wed Mar 9 19:23:05 2011 Last write time: Wed Mar 9 19:23:05 2011 Mount count: 1 Maximum mount count: -1 Last checked: Wed Mar 9 19:20:44 2011 Check interval: 0 (<none>) Lifetime writes: 19 MB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Required extra isize: 28 Desired extra isize: 28 Journal inode: 8 Default directory hash: half_md4 Directory Hash Seed: 27707648-c600-48df-b579-421863a91e4b Journal backup: inode blocks Journal features: (none) Journal size: 16M Journal length: 4096 Journal sequence: 0x00000001 Journal start: 0 Group 0: (Blocks 0-32767) [ITABLE_ZEROED] Checksum 0xce3c, unused inodes 6389 Primary superblock at 0, Group descriptors at 1-1 Reserved GDT blocks at 2-13 Block bitmap at 14 (+14), Inode bitmap at 30 (+30) Inode table at 46-445 (+46) 27848 free blocks, 6389 free inodes, 2 directories, 6389 unused inodes Free blocks: 4920-32767 Free inodes: 12-6400 Group 1: (Blocks 32768-51199) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0x9331, unused inodes 6400 Backup superblock at 32768, Group descriptors at 32769-32769 Reserved GDT blocks at 32770-32781 Block bitmap at 15 (+4294934543), Inode bitmap at 31 (+4294934559) Inode table at 446-845 (+4294934974) 18418 free blocks, 6400 free inodes, 0 directories, 6400 unused inodes Free blocks: 32782-51199 Free inodes: 6401-12800 -t (mke2fs -F -j -t ext4 home.img): Filesystem volume name: <none> Last mounted on: <not available> Filesystem UUID: 1d70ce7d-b457-4fbd-9215-1963daa24b0d Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super huge_file uninit_bg dir_nlink extra_isize Filesystem flags: signed_directory_hash Default mount options: user_xattr acl Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 51200 Block count: 204800 Reserved block count: 10240 Free blocks: 192691 Free inodes: 51189 First block: 1 Block size: 1024 Fragment size: 1024 Reserved GDT blocks: 256 Blocks per group: 8192 Fragments per group: 8192 Inodes per group: 2048 Inode blocks per group: 256 Flex block group size: 16 Filesystem created: Wed Mar 9 19:34:33 2011 Last mount time: Wed Mar 9 19:46:29 2011 Last write time: Wed Mar 9 19:46:29 2011 Mount count: 1 Maximum mount count: -1 Last checked: Wed Mar 9 19:34:33 2011 Check interval: 0 (<none>) Lifetime writes: 11 MB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 128 Journal inode: 8 Default directory hash: half_md4 Directory Hash Seed: 454298cc-952e-46d6-8d74-8ea471649240 Journal backup: inode blocks Journal features: (none) Journal size: 4096k Journal length: 4096 Journal sequence: 0x00000001 Journal start: 0 Group 0: (Blocks 1-8192) [ITABLE_ZEROED] Checksum 0x2df2, unused inodes 2037 Primary superblock at 1, Group descriptors at 2-2 Reserved GDT blocks at 3-258 Block bitmap at 259 (+258), Inode bitmap at 275 (+274) Inode table at 291-546 (+290) 3792 free blocks, 2037 free inodes, 2 directories, 2037 unused inodes Free blocks: 4401-8192 Free inodes: 12-2048 Group 1: (Blocks 8193-16384) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0xde7f, unused inodes 2048 Backup superblock at 8193, Group descriptors at 8194-8194 Reserved GDT blocks at 8195-8450 Block bitmap at 260 (+4294959363), Inode bitmap at 276 (+4294959379) Inode table at 547-802 (+4294959650) 7934 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 8451-16384 Free inodes: 2049-4096 Group 2: (Blocks 16385-24576) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED] Checksum 0xa44e, unused inodes 2048 Block bitmap at 261 (+4294951172), Inode bitmap at 277 (+4294951188) Inode table at 803-1058 (+4294951714) 8192 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 16385-24576 Free inodes: 4097-6144 Group 3: (Blocks 24577-32768) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0x3de9, unused inodes 2048 Backup superblock at 24577, Group descriptors at 24578-24578 Reserved GDT blocks at 24579-24834 Block bitmap at 262 (+4294942981), Inode bitmap at 278 (+4294942997) Inode table at 1059-1314 (+4294943778) 7934 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 24835-32768 Free inodes: 6145-8192 Group 4: (Blocks 32769-40960) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED] Checksum 0x33d9, unused inodes 2048 Block bitmap at 263 (+4294934790), Inode bitmap at 279 (+4294934806) Inode table at 1315-1570 (+4294935842) 8192 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 32769-40960 Free inodes: 8193-10240 Group 5: (Blocks 40961-49152) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0x6e1d, unused inodes 2048 Backup superblock at 40961, Group descriptors at 40962-40962 Reserved GDT blocks at 40963-41218 Block bitmap at 264 (+4294926599), Inode bitmap at 280 (+4294926615) Inode table at 1571-1826 (+4294927906) 7934 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 41219-49152 Free inodes: 10241-12288 Group 6: (Blocks 49153-57344) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED] Checksum 0x142c, unused inodes 2048 Block bitmap at 265 (+4294918408), Inode bitmap at 281 (+4294918424) Inode table at 1827-2082 (+4294919970) 8192 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 49153-57344 Free inodes: 12289-14336 Group 7: (Blocks 57345-65536) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0xc502, unused inodes 2048 Backup superblock at 57345, Group descriptors at 57346-57346 Reserved GDT blocks at 57347-57602 Block bitmap at 266 (+4294910217), Inode bitmap at 282 (+4294910233) Inode table at 2083-2338 (+4294912034) 7934 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 57603-65536 Free inodes: 14337-16384 Group 8: (Blocks 65537-73728) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED] Checksum 0x2330, unused inodes 2048 Block bitmap at 267 (+4294902026), Inode bitmap at 283 (+4294902042) Inode table at 2339-2594 (+4294904098) 8192 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 65537-73728 Free inodes: 16385-18432 Group 9: (Blocks 73729-81920) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0x0130, unused inodes 2048 Backup superblock at 73729, Group descriptors at 73730-73730 Reserved GDT blocks at 73731-73986 Block bitmap at 268 (+4294893835), Inode bitmap at 284 (+4294893851) Inode table at 2595-2850 (+4294896162) 7934 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 73987-81920 Free inodes: 18433-20480 Group 10: (Blocks 81921-90112) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED] Checksum 0x7b01, unused inodes 2048 Block bitmap at 269 (+4294885644), Inode bitmap at 285 (+4294885660) Inode table at 2851-3106 (+4294888226) 8192 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 81921-90112 Free inodes: 20481-22528 Group 11: (Blocks 90113-98304) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0x5993, unused inodes 2048 Block bitmap at 270 (+4294877453), Inode bitmap at 286 (+4294877469) Inode table at 3107-3362 (+4294880290) 4096 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 94209-98304 Free inodes: 22529-24576 Group 12: (Blocks 98305-106496) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED] Checksum 0xec96, unused inodes 2048 Block bitmap at 271 (+4294869262), Inode bitmap at 287 (+4294869278) Inode table at 3363-3618 (+4294872354) 8192 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 98305-106496 Free inodes: 24577-26624 Group 13: (Blocks 106497-114688) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED] Checksum 0x8229, unused inodes 2048 Block bitmap at 272 (+4294861071), Inode bitmap at 288 (+4294861087) Inode table at 3619-3874 (+4294864418) 8192 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 106497-114688 Free inodes: 26625-28672 Group 14: (Blocks 114689-122880) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED] Checksum 0x8bc0, unused inodes 2048 Block bitmap at 273 (+4294852880), Inode bitmap at 289 (+4294852896) Inode table at 3875-4130 (+4294856482) 8192 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 114689-122880 Free inodes: 28673-30720 Group 15: (Blocks 122881-131072) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED] Checksum 0xb824, unused inodes 2048 Block bitmap at 274 (+4294844689), Inode bitmap at 290 (+4294844705) Inode table at 4131-4386 (+4294848546) 8192 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 122881-131072 Free inodes: 30721-32768 Group 16: (Blocks 131073-139264) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0x3f30, unused inodes 2048 Block bitmap at 131073 (+0), Inode bitmap at 131089 (+16) Inode table at 131105-131360 (+32) 5870 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 131082-131088, 131098-131104, 133409-139264 Free inodes: 32769-34816 Group 17: (Blocks 139265-147456) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED] Checksum 0xc772, unused inodes 2048 Block bitmap at 131074 (+4294959105), Inode bitmap at 131090 (+4294959121) Inode table at 131361-131616 (+4294959392) 8192 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 139265-147456 Free inodes: 34817-36864 Group 18: (Blocks 147457-155648) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED] Checksum 0x2cb8, unused inodes 2048 Block bitmap at 131075 (+4294950914), Inode bitmap at 131091 (+4294950930) Inode table at 131617-131872 (+4294951456) 8192 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 147457-155648 Free inodes: 36865-38912 Group 19: (Blocks 155649-163840) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED] Checksum 0x9f43, unused inodes 2048 Block bitmap at 131076 (+4294942723), Inode bitmap at 131092 (+4294942739) Inode table at 131873-132128 (+4294943520) 8192 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 155649-163840 Free inodes: 38913-40960 Group 20: (Blocks 163841-172032) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED] Checksum 0x84cd, unused inodes 2048 Block bitmap at 131077 (+4294934532), Inode bitmap at 131093 (+4294934548) Inode table at 132129-132384 (+4294935584) 8192 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 163841-172032 Free inodes: 40961-43008 Group 21: (Blocks 172033-180224) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED] Checksum 0x08d4, unused inodes 2048 Block bitmap at 131078 (+4294926341), Inode bitmap at 131094 (+4294926357) Inode table at 132385-132640 (+4294927648) 8192 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 172033-180224 Free inodes: 43009-45056 Group 22: (Blocks 180225-188416) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED] Checksum 0xe31e, unused inodes 2048 Block bitmap at 131079 (+4294918150), Inode bitmap at 131095 (+4294918166) Inode table at 132641-132896 (+4294919712) 8192 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 180225-188416 Free inodes: 45057-47104 Group 23: (Blocks 188417-196608) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED] Checksum 0x2f21, unused inodes 2048 Block bitmap at 131080 (+4294909959), Inode bitmap at 131096 (+4294909975) Inode table at 132897-133152 (+4294911776) 8192 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 188417-196608 Free inodes: 47105-49152 Group 24: (Blocks 196609-204799) [INODE_UNINIT, ITABLE_ZEROED] Checksum 0x8bfc, unused inodes 2048 Block bitmap at 131081 (+4294901768), Inode bitmap at 131097 (+4294901784) Inode table at 133153-133408 (+4294903840) 8191 free blocks, 2048 free inodes, 0 directories, 2048 unused inodes Free blocks: 196609-204799 Free inodes: 49153-51200
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