Btrfs: prevent loops in the directory tree when creating snapshots

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For a directory tree:

/mnt/subvolA/subvolB

btrfsctl -s /mnt/subvolA/subvolB /mnt

Will create a directory loop with subvolA under subvolB.  This
commit uses the forward refs for each subvol and snapshot to error out
before creating the loop.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

...

This commit is contained in:

Chris Mason 2008-11-17 21:14:24 -05:00

parent 0660b5af3f

commit ea9e8b11bd

4 changed files with 73 additions and 1 deletions

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3

fs/btrfs/ctree.h

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5

fs/btrfs/disk-io.c

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50

fs/btrfs/ioctl.c

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16

fs/btrfs/root-tree.c

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