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If the enable_periodic_fsck option is false in /etc/mke2fs.conf (which
is also the default), s_max_mnt_count needs to be set to -1, instead
of 0. Kernels newer than 3.0 will interpret 0 to disable periodic
checks, but older kernels will print a warning message on each mount,
which will annoy users.
Addresses-Debian-Bug: #632637
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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Multi-mount protection is feature that allows mke2fs, e2fsck, and
others to detect if the filesystem is mounted on a remote node (on
SAN disks) and avoid corrupting the filesystem. For e2fsprogs this
means that it checks the MMP block to see if the filesystem is in use,
and marks the filesystem busy while e2fsck is running on the system.
This is useful on SAN disks that are shared between high-availability
servers, or accessible by multiple nodes that aren't in HA pairs. MMP
isn't intended to serve as a primary HA exclusion mechanism, but as a
failsafe to protect against user, software, or hardware errors.
There is no requirement that e2fsck updates the MMP block at regular
intervals, but e2fsck does this occasionally to provide useful
information to the sysadmin in case of a detected conflict.
For the kernel (since Linux 3.0) MMP adds a "heartbeat" mechanism to
periodically write to disk (every few seconds by default) to notify
other nodes that the filesystem is still in use and unsafe to modify.
Originally-by: Kalpak Shah <kalpak@clusterfs.com>
Signed-off-by: Johann Lombardi <johann@whamcloud.com>
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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We are doing ext2fs_flush() twice right now at the end of the mke2fs.
First by directly calling ext2fs_flush() which is intended to write
superblock and fs accounting information. And then it is invoked again
when we are calling ext2fs_close(), only this time, because the fs is
not dirty, we are writing out only superblock.
I think it is bad to call it twice because even when writing only super
block it takes some time on bigger file systems and moreover
ext2fs_close() can fail without any reasonable explanation for the user.
Also ext2fs_flush() is printing out progress and it is confusing for the
users.
Fix all this by removing the ext2fs_flush() and leaving it all to
ext2fs_close(). However we need to introduce new variables to store
check interval and max mount count, because fs structure is freed on
ext2fs_close() and we really want to print those information as the last
info for the user.
[ Fixed type mismatch in a printf format statement -tytso]
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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error message could be printed on an malloc() failure, and e2image
was optimized to avoid needless system calls by using the stashed
inode functions.
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tune2fs.c, mke2fs.c, util.c, util.h (print_check_message): Move the
message which displays how often the filesystem will be checked from
mke2fs into a utility subroutine. Then cause tune2fs to call that
function to display the message after adding a journal to a
filesystem.
mke2fs.8.in: Add manual page fixups and explanation for why it's good
to check filesystems periodically from Andreas Dilger.
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ke2fs.8.in, tune2fs.8.in: Change man paegs to document that the
journal must be bewteen 1024 and 10,240 file system blocks.
mke2fs.c, tune2fs.c: Change to use figure_journal_size()
util.c, util.h (figure_journal_size): Change journal_default_size into
routine which also converts the requested journal size into filesystem
blocks and does bounds checking to make sure the journal is sized
reasonably. Renamed function to journal_default_size.
parse_journal_opts): Remove bounds check for the journal size, since
this is now done in figure_journal_size, and based on the number of
filesystem blocks, as opposed to using the absolute size of the
journal.
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util.h, util.c (journal_default_size): New function from Andreas
Dilger to calculate an appropriate default journal size given a
filesystem size.
util.c (parse_journal_opts): Allow the creation of a journal as small
as 1MB.
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tune2fs.c (update_feature_set, add_journal): Moved to separate
functions. Added ability to add and remove the journal while the
filesystem is live. Added support for setting a time-based UUID.
Removed zero-initialized static variables.
mke2fs.c, util.c, util.h (strcasecmp, proceed_question,
check_plausibility, parse_journal_opts, check_mount): Moved functions
to util.c so they can be used by tune2fs.
mke2fs.c (main): Change ext2fs_add_journal_fs() to
ext2fs_add_journal_inode() to reflect function renaming.
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