Shrinking Support: Difference between revisions
New page: Currently XFS Filesystems can't be shrunk. To suppor shrinking XFS filesystems a few thinks needs to be implemented, based on a list by Dave Chinner [http://marc.info/?l=linux-xfs&m=11913... |
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Currently XFS Filesystems can't be shrunk. | Currently XFS Filesystems can't be shrunk. | ||
To suppor shrinking XFS filesystems a few thinks needs to be implemented, based on a list by Dave Chinner [http://marc.info/?l=linux-xfs&m= | To suppor shrinking XFS filesystems a few thinks needs to be implemented, based on a list by Dave Chinner [http://marc.info/?l=linux-xfs&m=118091640624488&w=2]: | ||
* An ioctl or similar interface to prevent new allocations from a given allocation group. | * An ioctl or similar interface to prevent new allocations from a given allocation group. | ||
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get in the way. To fix that, we'll need to implement transactions | get in the way. To fix that, we'll need to implement transactions | ||
to move the log... | to move the log... | ||
== Available pieces == | |||
* A script from Ruben Porras to check if enough free space is available to support shrinking [[http://marc.info/?l=linux-xfs&m=118581682117599&w=2]] | |||
* A patch from Dave Chinner to allow / disallow allocation from an allocation group [http://marc.info/?l=linux-xfs&m=118181261313174&w=2] | |||
Revision as of 18:15, 21 December 2008
Currently XFS Filesystems can't be shrunk.
To suppor shrinking XFS filesystems a few thinks needs to be implemented, based on a list by Dave Chinner [1]:
- An ioctl or similar interface to prevent new allocations from a given allocation group.
- A variant of the xfs_reno tool to support moving inodes out of filesystem areas that go away.
- A variant of the xfs_fsr tool to support moving data out of the filesystem areas that go away.
- An ioctl or similar interface to prevent new allocations from a given allocation group
- Some way to move out orphan metadata out of the AGs truncated off
- A transaction to shrink the filesystem.
At that point, we'll got a "working" shrink that will allow shrinking to only 50% of the original size because the log will get in the way. To fix that, we'll need to implement transactions to move the log...
Available pieces
- A script from Ruben Porras to check if enough free space is available to support shrinking [[2]]
- A patch from Dave Chinner to allow / disallow allocation from an allocation group [3]