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mke2fs: further updates for mke2fs(8) man page 

The mke2fs(8) man page was updated in 4727c67dc2, but needs some
more clear descriptions for extra_isize and metadta_csum features.
The uninit_bg feature is supported by all ext4-capable kernels,
and does have a slow e2fsck pass for newly-formatted filesystems,
so remove the caveat.

Signed-off-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
debian-1.42.9
Andreas Dilger 2013-12-23 16:09:49 -05:00 committed by Theodore Ts'o
parent 2bc3041754
commit b769aaec1a
1 changed files with 22 additions and 14 deletions
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36
misc/mke2fs.8.in
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@ -210,8 +210,8 @@ in earlier versions of
.BR mke2fs .
The
.B \-R
option is still accepted for backwards compatibility. The
following extended options are supported:
option is still accepted for backwards compatibility, but is deprecated.
The following extended options are supported:
.RS 1.2i
.TP
.BI mmp_update_interval= interval
@ -548,7 +548,7 @@ of e2fsprogs will not support file systems with this feature enabled.
.TP
.B bigalloc
.br
This feature enables clustered allocation, so that the unit of
This feature enables clustered block allocation, so that the unit of
allocation is a power of two number of blocks. That is, each bit in the
what had traditionally been known as the block allocation bitmap now
indicates whether a cluster is in use or not, where a cluster is by
@ -570,7 +570,7 @@ features be enabled.
.TP
.B dir_index
.br
Use hashed b-trees to speed up lookups in large directories.
Use hashed b-trees to speed up name lookups in large directories.
.TP
.B dir_nlink
.br
@ -590,8 +590,15 @@ historical/backwards compatibility reasons.)
.TP
.B extra_isize
.br
This feature enables storage of nanosecond timestamps and creation
time, if the inode size is larger than 256 bytes or larger.
This feature reserves a specific amount of space in each inode for
extended metadata such as nanosecond timestamps and file creation time,
even if the current kernel does not current need to reserve this much
space. Without this feature, the kernel will reserve the amount of
space for features currently it currently needs, and the rest may be
consumed by extended attributes.
For this feature to be useful the inode size must be 256 bytes in size
or larger.
.TP
.B ext_attr
.br
@ -649,10 +656,16 @@ set this feature automatically when a file > 2GiB is created.)
.\" .TP
.\" .B metadata_csum
.\" .br
.\" Filesystem supports metadata checksumming. This feature enables a
.\" superset of the functionality of the
.\" Filesystem supports metadata checksumming. This feature stores
.\" checksums for all of the filesystem metadata (superblock, group
.\" descriptor blocks, inode and block bitmaps, directories, and
.\" extent tree blocks). The checksum algorithm used for the metadata
.\" blocks is different than the one used for group descriptors with the
.\" .B uninit_bg
.\" feature.
.\" feature, these two features are incompatible and
.\" .B metadata_csum
.\" will be used preferentially instead of
.\" .BR uninit_bg .
.\" .br
.\" .B Future feature, available in e2fsprogs 1.43-WIP
.TP
@ -719,11 +732,6 @@ and keep a high watermark for the unused inodes in a filesystem, to reduce
.BR e2fsck (8)
time. The result is that it can speed up filesystem creation time noticeably
(if lazy_itable_init is enabled).
.IP
This first e2fsck run after enabling this feature will take the
full time, but subsequent e2fsck runs will take only a fraction of the
original time, depending on how full the file system is.
It is only supported by the ext4 filesystem in recent Linux kernels.
.RE
.TP
.B \-q