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| author | Andreas Dilger <adilger@whamcloud.com> | 2011-09-24 13:48:55 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2011-09-25 01:55:23 -0400 |
| commit | 0f5eba7501f467f757792ee449d16c9259b994fd (patch) | |
| tree | 017ff4ababf519440760ecb49bcc43a5cd618d15 /misc/util.h | |
| parent | 6747ac86b9b4eac864af768a2fa09b8a22e363a5 (diff) | |
| download | android_external_e2fsprogs-0f5eba7501f467f757792ee449d16c9259b994fd.tar.gz android_external_e2fsprogs-0f5eba7501f467f757792ee449d16c9259b994fd.tar.bz2 android_external_e2fsprogs-0f5eba7501f467f757792ee449d16c9259b994fd.zip | |
ext2fs: add multi-mount protection (INCOMPAT_MMP)
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>
Diffstat (limited to 'misc/util.h')
| -rw-r--r-- | misc/util.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/misc/util.h b/misc/util.h index d05f17e4..56a77656 100644 --- a/misc/util.h +++ b/misc/util.h @@ -24,3 +24,4 @@ extern void parse_journal_opts(const char *opts); extern void check_mount(const char *device, int force, const char *type); extern unsigned int figure_journal_size(int size, ext2_filsys fs); extern void print_check_message(unsigned int, unsigned int); +extern void dump_mmp_msg(struct mmp_struct *mmp, const char *msg); |