fuse: fix inode initialization race #81
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bsbernd
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bsbernd
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Fix a race between fuse_iget() and fuse_reverse_inval_inode() where invalidation can arrive while an inode is being initialized, causing the invalidation to be lost. Add a waitqueue to make fuse_reverse_inval_inode() wait when it encounters an inode with attr_version == 0 (still initializing). When fuse_change_attributes_common() completes initialization, it wakes waiting threads. The woken thread also wakes other waiters to handle multiple concurrent invalidations. This ensures invalidations are properly serialized with inode initialization, maintaining cache coherency. Signed-off-by: Horst Birthelmer <hbirthelmer@ddn.com>
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Fix a race between fuse_iget() and fuse_reverse_inval_inode() where invalidation can arrive while an inode is being initialized, causing the invalidation to be lost.
Add a waitqueue to make fuse_reverse_inval_inode() wait when it encounters an inode with attr_version == 0 (still initializing). When fuse_change_attributes_common() completes initialization, it wakes waiting threads. The woken thread also wakes other waiters to handle multiple concurrent invalidations.
This ensures invalidations are properly serialized with inode initialization, maintaining cache coherency.