Btrfs: Fix subvolume creation locking rules

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Creating a subvolume is in many ways like a normal VFS ->mkdir, and we
really need to play with the VFS topology locking rules.  So instead of
just creating the snapshot on disk and then later getting rid of
confliting aliases do it correctly from the start.  This will become
especially important once we allow for subvolumes anywhere in the tree,
and not just below a hidden root.

Note that snapshots will need the same treatment, but do to the delay
in creating them we can't do it currently.  Chris promised to fix that
issue, so I'll wait on that.

Signed-off-by: Christoph Hellwig <hch@lst.de>

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This commit is contained in:

Christoph Hellwig 2008-10-09 13:39:39 -04:00 • committed by Chris Mason

parent 833023e46c

commit cb8e70901d

3 changed files with 100 additions and 14 deletions

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2

fs/btrfs/ctree.h

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10

fs/btrfs/inode.c

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102

fs/btrfs/ioctl.c

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