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tune2fs.8.in: Add a description of the .journal file, why it

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is created, and how e2fsck converts it to an invisible
journal.  (Addresses Debian Bug #256760)
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Theodore Ts'o 2004-09-19 07:34:35 -04:00
parent 8667f7a211
commit 91d71c4147
2 changed files with 33 additions and 0 deletions
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6
misc/ChangeLog
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@ -1,3 +1,9 @@
2004-09-19 Theodore Ts'o <tytso@mit.edu>
* tune2fs.8.in: Add a description of the .journal file, why it
is created, and how e2fsck converts it to an invisible
journal. (Addresses Debian Bug #256760)
2004-09-18 Theodore Ts'o <tytso@mit.edu>
* e2initrd_helper.c: New program which allows initrd scripts to

27
misc/tune2fs.8.in
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@ -186,6 +186,33 @@ option is not specified, the default journal parameters will be used to create
an appropriately sized journal (given the size of the filesystem)
stored within the filesystem. Note that you must be using a kernel
which has ext3 support in order to actually make use of the journal.
.IP
If this option is used to create a journal on a mounted filesystem, an
immutable file,
.BR .journal ,
will be created in the top-level directory of the filesystem, as it is
the only safe way to create the journal inode while the filesystem is
mounted. While the ext3 journal is visible, it is not safe to
delete it, or modify it while the filesystem is mounted; for this
reason the file is marked immutable.
While checking unmounted filesystems,
.BR e2fsck (8)
will automatically move
.B .journal
files to the invisible, reserved journal inode. For all filesystems
except for the root filesystem, this should happen automatically and
naturally during the next reboot cycle. Since the root filesystem is
mounted read-only,
.BR e2fsck (8)
must be run from a rescue floppy in order to effect this transition.
.IP
On some distributions, such as Debian, if an initial ramdisk is used,
the initrd scripts will automatically convert an ext2 root filesystem
to ext3 if the
.BR /etc/fstab
file specifies the ext3 filesystem for the root filesystem in order to
avoid requiring the use of a rescue floppy to add an ext3 journal to
the root filesystem.
.TP
.BR \-J " journal-options"
Override the default ext3 journal parameters. Journal options are comma