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Revert "[fuse] fix deadlock between fuse_put_super() and request_end()"

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This reverts 73ce8355c2 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>
This commit is contained in:
Miklos Szeredi
2006-04-26 10:48:55 +02:00
parent 4d5c34ec7b
commit 5a5fb1ea74
3 changed files with 31 additions and 36 deletions
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28
fs/fuse/dev.c
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@@ -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);
}
}