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author | Miklos Szeredi <miklos@szeredi.hu> | 2006-04-11 15:14:26 -0400 |
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committer | Miklos Szeredi <miklos@szeredi.hu> | 2006-04-11 15:14:26 -0400 |
commit | 73ce8355c243a434524a34c05cc417dd0467996e (patch) | |
tree | a5bc5bfb31c41a5806caf763533943e7411e6543 /net/ipv4/ip_sockglue.c | |
parent | 2514395ef88b46e895726a8d40966cb83de7940c (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>
Diffstat (limited to 'net/ipv4/ip_sockglue.c')
0 files changed, 0 insertions, 0 deletions