diff options
Diffstat (limited to 'fs/Kconfig')
| -rw-r--r-- | fs/Kconfig | 48 |
1 files changed, 40 insertions, 8 deletions
@@ -143,24 +143,24 @@ config EXT3_FS_SECURITY config EXT4DEV_FS tristate "Ext4dev/ext4 extended fs support development (EXPERIMENTAL)" depends on EXPERIMENTAL - select JBD - help + select JBD2 + help Ext4dev is a predecessor filesystem of the next generation extended fs ext4, based on ext3 filesystem code. It will be renamed ext4 fs later, once ext4dev is mature and stabilized. - Unlike the change from ext2 filesystem to ext3 filesystem, - the on-disk format of ext4dev is not the same as ext3 any more: + Unlike the change from ext2 filesystem to ext3 filesystem, + the on-disk format of ext4dev is not the same as ext3 any more: it is based on extent maps and it supports 48-bit physical block - numbers. These combined on-disk format changes will allow + numbers. These combined on-disk format changes will allow ext4dev/ext4 to handle more than 16 TB filesystem volumes -- a hard limit that ext3 cannot overcome without changing the - on-disk format. + on-disk format. Other than extent maps and 48-bit block numbers, ext4dev also is - likely to have other new features such as persistent preallocation, + likely to have other new features such as persistent preallocation, high resolution time stamps, and larger file support etc. These - features will be added to ext4dev gradually. + features will be added to ext4dev gradually. To compile this file system support as a module, choose M here. The module will be called ext4dev. Be aware, however, that the filesystem @@ -239,6 +239,38 @@ config JBD_DEBUG generated. To turn debugging off again, do "echo 0 > /proc/sys/fs/jbd-debug". +config JBD2 + tristate + help + This is a generic journaling layer for block devices that support + both 32-bit and 64-bit block numbers. It is currently used by + the ext4dev/ext4 filesystem, but it could also be used to add + journal support to other file systems or block devices such + as RAID or LVM. + + If you are using ext4dev/ext4, you need to say Y here. If you are not + using ext4dev/ext4 then you will probably want to say N. + + To compile this device as a module, choose M here. The module will be + called jbd2. If you are compiling ext4dev/ext4 into the kernel, + you cannot compile this code as a module. + +config JBD2_DEBUG + bool "JBD2 (ext4dev/ext4) debugging support" + depends on JBD2 + help + If you are using the ext4dev/ext4 journaled file system (or + potentially any other filesystem/device using JBD2), this option + allows you to enable debugging output while the system is running, + in order to help track down any problems you are having. + By default, the debugging output will be turned off. + + If you select Y here, then you will be able to turn on debugging + with "echo N > /proc/sys/fs/jbd2-debug", where N is a number between + 1 and 5. The higher the number, the more debugging output is + generated. To turn debugging off again, do + "echo 0 > /proc/sys/fs/jbd2-debug". + config FS_MBCACHE # Meta block cache for Extended Attributes (ext2/ext3/ext4) tristate |
