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authorMiklos Szeredi <miklos@szeredi.hu>2006-04-26 10:48:55 +0200
committerMiklos Szeredi <miklos@szeredi.hu>2006-04-26 10:48:55 +0200
commit5a5fb1ea74d8b82ca1461b885a1334fb21e037be (patch)
treef6e823d4a8e09ce0780d891f8f38f033ccbd7da2 /fs/fuse/dev.c
parent[PATCH] Alpha: strncpy() fix (diff)
downloadlinux-5a5fb1ea74d8b82ca1461b885a1334fb21e037be.tar.xz
linux-5a5fb1ea74d8b82ca1461b885a1334fb21e037be.zip
Revert "[fuse] fix deadlock between fuse_put_super() and request_end()"
This reverts 73ce8355c243a434524a34c05cc417dd0467996e commit. It was wrong, because it didn't take into account the requirement, that iput() for background requests must be performed synchronously with ->put_super(), otherwise active inodes may remain after unmount. The right solution is to keep the sbput_sem and perform iput() within the locked region, but move fput() outside sbput_sem. Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Diffstat (limited to 'fs/fuse/dev.c')
-rw-r--r--fs/fuse/dev.c28
1 files changed, 12 insertions, 16 deletions
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index cc750c68fe70..4967bd40b953 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -128,14 +128,20 @@ void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req)
}
}
-void fuse_remove_background(struct fuse_conn *fc, struct fuse_req *req)
+void fuse_release_background(struct fuse_conn *fc, struct fuse_req *req)
{
- list_del_init(&req->bg_entry);
+ iput(req->inode);
+ iput(req->inode2);
+ if (req->file)
+ fput(req->file);
+ spin_lock(&fc->lock);
+ list_del(&req->bg_entry);
if (fc->num_background == FUSE_MAX_BACKGROUND) {
fc->blocked = 0;
wake_up_all(&fc->blocked_waitq);
}
fc->num_background--;
+ spin_unlock(&fc->lock);
}
/*
@@ -165,27 +171,17 @@ static void request_end(struct fuse_conn *fc, struct fuse_req *req)
wake_up(&req->waitq);
fuse_put_request(fc, req);
} else {
- struct inode *inode = req->inode;
- struct inode *inode2 = req->inode2;
- struct file *file = req->file;
void (*end) (struct fuse_conn *, struct fuse_req *) = req->end;
req->end = NULL;
- req->inode = NULL;
- req->inode2 = NULL;
- req->file = NULL;
- if (!list_empty(&req->bg_entry))
- fuse_remove_background(fc, req);
spin_unlock(&fc->lock);
-
+ down_read(&fc->sbput_sem);
+ if (fc->mounted)
+ fuse_release_background(fc, req);
+ up_read(&fc->sbput_sem);
if (end)
end(fc, req);
else
fuse_put_request(fc, req);
-
- if (file)
- fput(file);
- iput(inode);
- iput(inode2);
}
}