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authorSteven Whitehouse <swhiteho@redhat.com>2010-06-14 10:01:30 +0100
committerSteven Whitehouse <swhiteho@redhat.com>2010-07-29 09:36:35 +0100
commitba6e93645f039bd357e04b7b9d18f4e67757725e (patch)
tree11d2d4491255cd9a298fe098f6ec52e0f3d8b577 /Documentation/kvm
parent30116ff6c6d140bc696cc624e6d8e38f018c886e (diff)
GFS2: Wait for journal id on mount if not specified on mount command line
This patch implements a wait for the journal id in the case that it has not been specified on the command line. This is to allow the future removal of the mount.gfs2 helper. The journal id would instead be directly communicated by gfs_controld to the file system. Here is a comparison of the two systems: Current: 1. mount calls mount.gfs2 2. mount.gfs2 connects to gfs_controld to retrieve the journal id 3. mount.gfs2 adds the journal id to the mount command line and calls the mount system call 4. gfs_controld receives the status of the mount request via a uevent Proposed: 1. mount calls the mount system call (no mount.gfs2 helper) 2. gfs_controld receives a uevent for a gfs2 fs which it doesn't know about already 3. gfs_controld assigns a journal id to it via sysfs 4. the mount system call then completes as normal (sending a uevent according to status) The advantage of the proposed system is that it is completely backward compatible with the current system both at the kernel and at the userland levels. The "first" parameter can also be set the same way, with the restriction that it must be set before the journal id is assigned. In addition, if mount becomes stuck waiting for a reply from gfs_controld which never arrives, then it is killable and will abort the mount gracefully. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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