https://bugzilla.kernel.org/show_bug.cgi?id=47151 Summary: provide a file system block size of 8KB for certain SSDs. Product: File System Version: 2.5 Kernel Version: 3.4.6-2.10-default Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: enhancement Priority: P1 Component: ext4 AssignedTo: fs_ext4@xxxxxxxxxxxxxxxxxxxx ReportedBy: estellnb@xxxxxxxxxx Regression: No Sandisk support says that its 480GB SSDs have a block size of 8KB instead of the usual 4KB. Thus in order to use that SSD we would have to format with a block size of 8KB. As SSDs get bigger and bigger it is likely that also other vendors will sell SSDs with a block size of 8KB. Please look forward to supporting an ext4 blocksize of 8KB! # mkfs.ext4 -b 8192 test.disk Warning: blocksize 8192 not usable on most systems. mke2fs 1.42.4 (12-June-2012) test.disk is not a block special device. Proceed anyway? (y,n) y mkfs.ext4: 8192-byte blocks too big for system (max 4096) Proceed anyway? (y,n) y Warning: 8192-byte blocks too big for system (max 4096), forced to continue Discarding device blocks: done Filesystem label= OS type: Linux Block size=8192 (log=3) Fragment size=8192 (log=3) Stride=0 blocks, Stripe width=0 blocks 1280 inodes, 1280 blocks 64 blocks (5.00%) reserved for the super user First data block=0 1 block group 65528 blocks per group, 65528 fragments per group 1280 inodes per group Allocating group tables: done Writing inode tables: done Filesystem too small for a journal Writing superblocks and filesystem accounting information: done # mount -o loop test.disk /mnt/ mount: wrong fs type, bad option, bad superblock on /dev/loop0, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so # dmesg | tail [ 2020.657698] SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=33:33:00:00:00:fb:44:d8:84:61:8c:33:86:dd SRC=fe80:0000:0000:0000:46d8:84ff:fe61:8c33 DST=ff02:0000:0000:0000:0000:0000:0000:00fb LEN=227 TC=0 HOPLIMIT=255 FLOWLBL=0 PROTO=UDP SPT=5353 DPT=5353 LEN=187 [ 2020.657874] SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=33:33:00:00:00:fb:44:d8:84:61:8c:33:86:dd SRC=fe80:0000:0000:0000:46d8:84ff:fe61:8c33 DST=ff02:0000:0000:0000:0000:0000:0000:00fb LEN=227 TC=0 HOPLIMIT=255 FLOWLBL=0 PROTO=UDP SPT=5353 DPT=5353 LEN=187 [ 2020.696054] SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=33:33:00:00:00:fb:44:d8:84:61:8c:33:86:dd SRC=fe80:0000:0000:0000:46d8:84ff:fe61:8c33 DST=ff02:0000:0000:0000:0000:0000:0000:00fb LEN=227 TC=0 HOPLIMIT=255 FLOWLBL=0 PROTO=UDP SPT=5353 DPT=5353 LEN=187 [ 2020.992554] SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=33:33:00:00:00:fb:44:d8:84:61:8c:33:86:dd SRC=fe80:0000:0000:0000:46d8:84ff:fe61:8c33 DST=ff02:0000:0000:0000:0000:0000:0000:00fb LEN=431 TC=0 HOPLIMIT=255 FLOWLBL=0 PROTO=UDP SPT=5353 DPT=5353 LEN=391 [ 2045.224133] SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=33:33:00:00:00:fb:44:d8:84:61:8c:33:86:dd SRC=fe80:0000:0000:0000:46d8:84ff:fe61:8c33 DST=ff02:0000:0000:0000:0000:0000:0000:00fb LEN=142 TC=0 HOPLIMIT=255 FLOWLBL=0 PROTO=UDP SPT=5353 DPT=5353 LEN=102 [ 2188.427869] SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=33:33:00:00:00:fb:00:1b:63:2f:5e:93:86:dd SRC=fe80:0000:0000:0000:021b:63ff:fe2f:5e93 DST=ff02:0000:0000:0000:0000:0000:0000:00fb LEN=111 TC=0 HOPLIMIT=255 FLOWLBL=0 PROTO=UDP SPT=5353 DPT=5353 LEN=71 [ 2188.429149] SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=33:33:00:00:00:fb:00:80:77:d8:ee:7d:86:dd SRC=fe80:0000:0000:0000:0280:77ff:fed8:ee7d DST=ff02:0000:0000:0000:0000:0000:0000:00fb LEN=485 TC=0 HOPLIMIT=1 FLOWLBL=0 PROTO=UDP SPT=5353 DPT=5353 LEN=445 [ 2192.171020] EXT4-fs (loop0): bad block size 8192 [ 2193.769124] SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC= SRC=fe80:0000:0000:0000:02a0:ccff:fed9:b3da DST=ff02:0000:0000:0000:0000:0000:0000:00fb LEN=84 TC=0 HOPLIMIT=255 FLOWLBL=0 PROTO=UDP SPT=5353 DPT=5353 LEN=44 [ 2246.621356] EXT4-fs (loop0): bad block size 8192 -- Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are watching the assignee of the bug. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
