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authorMiklos Szeredi <miklos@szeredi.hu>2006-04-11 21:14:26 +0200
committerMiklos Szeredi <miklos@szeredi.hu>2006-04-11 21:14:26 +0200
commit73ce8355c243a434524a34c05cc417dd0467996e (patch)
treea5bc5bfb31c41a5806caf763533943e7411e6543 /arch/powerpc/kernel/vmlinux.lds.S
parent2514395ef88b46e895726a8d40966cb83de7940c (diff)
[fuse] fix deadlock between fuse_put_super() and request_end()
A deadlock was possible, when the last reference to the superblock was held due to a background request containing a file reference. Releasing the file would release the vfsmount which in turn would release the superblock. Since sbput_sem is held during the fput() and fuse_put_super() tries to acquire this same semaphore, a deadlock results. The chosen soltuion is to get rid of sbput_sem, and instead use the spinlock to ensure the referenced inodes/file are released only once. Since the actual release may sleep, defer these outside the locked region, but using local variables instead of the structure members. This is a much more rubust solution. Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
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