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authorJeremy Kerr <jk@ozlabs.org>2007-11-15 21:32:23 -0500
committerPaul Mackerras <paulus@samba.org>2007-11-20 00:10:20 -0500
commitc443acab2eebf12dce7e78fe29e76786f55ad1be (patch)
treec740b3e4ee8c75ade937b2c8fc9fcbeb7f87cfe6 /arch/powerpc
parenta2b51812a4dc5db09ab4d4638d4d8ed456e2457e (diff)
[POWERPC] spufs: Fix context destroy vs /spu readdir race
We can currently cause an oops by repeatedly creating and destroying contexts, while doing getdents() calls on the "/spu" directory. This is due to the context's top-level dentry remaining hashed while the context is being destroyed. Fix this by unhashing the context's dentry with the dentry->d_inode->i_mutex held. This way, we'll hit the check for d_unhashed in dentry_readdir, and won't be included in the list of subdirs for /spu. test: spufs-testsuite:tests/01-spu_create/07-destroy-vs-readdir-race Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/platforms/cell/spufs/inode.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/cell/spufs/inode.c b/arch/powerpc/platforms/cell/spufs/inode.c
index 0966d093db43..c0e968a4c211 100644
--- a/arch/powerpc/platforms/cell/spufs/inode.c
+++ b/arch/powerpc/platforms/cell/spufs/inode.c
@@ -171,6 +171,7 @@ static int spufs_rmdir(struct inode *parent, struct dentry *dir)
171{ 171{
172 /* remove all entries */ 172 /* remove all entries */
173 spufs_prune_dir(dir); 173 spufs_prune_dir(dir);
174 d_drop(dir);
174 175
175 return simple_rmdir(parent, dir); 176 return simple_rmdir(parent, dir);
176} 177}