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authorMiklos Szeredi <miklos@szeredi.hu>2006-04-26 08:48:55 (GMT)
committerMiklos Szeredi <miklos@szeredi.hu>2006-04-26 08:48:55 (GMT)
commit5a5fb1ea74d8b82ca1461b885a1334fb21e037be (patch)
treef6e823d4a8e09ce0780d891f8f38f033ccbd7da2 /fs/fuse/inode.c
parent4d5c34ec7b007cfb0771a36996b009f194acbb2f (diff)
downloadlinux-fsl-qoriq-5a5fb1ea74d8b82ca1461b885a1334fb21e037be.tar.xz
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/inode.c')
-rw-r--r--fs/fuse/inode.c27
1 files changed, 10 insertions, 17 deletions
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 43a6fc0..fd34037 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -204,26 +204,17 @@ static void fuse_put_super(struct super_block *sb)
{
struct fuse_conn *fc = get_fuse_conn_super(sb);
+ down_write(&fc->sbput_sem);
+ while (!list_empty(&fc->background))
+ fuse_release_background(fc,
+ list_entry(fc->background.next,
+ struct fuse_req, bg_entry));
+
spin_lock(&fc->lock);
+ fc->mounted = 0;
fc->connected = 0;
- while (!list_empty(&fc->background)) {
- struct fuse_req *req = list_entry(fc->background.next,
- struct fuse_req, bg_entry);
- struct inode *inode = req->inode;
- struct inode *inode2 = req->inode2;
-
- /* File would hold a reference to vfsmount */
- BUG_ON(req->file);
- req->inode = NULL;
- req->inode2 = NULL;
- fuse_remove_background(fc, req);
-
- spin_unlock(&fc->lock);
- iput(inode);
- iput(inode2);
- spin_lock(&fc->lock);
- }
spin_unlock(&fc->lock);
+ up_write(&fc->sbput_sem);
/* Flush all readers on this fs */
kill_fasync(&fc->fasync, SIGIO, POLL_IN);
wake_up_all(&fc->waitq);
@@ -395,6 +386,7 @@ static struct fuse_conn *new_conn(void)
INIT_LIST_HEAD(&fc->processing);
INIT_LIST_HEAD(&fc->io);
INIT_LIST_HEAD(&fc->background);
+ init_rwsem(&fc->sbput_sem);
kobj_set_kset_s(fc, connections_subsys);
kobject_init(&fc->kobj);
atomic_set(&fc->num_waiting, 0);
@@ -549,6 +541,7 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
goto err_free_req;
sb->s_root = root_dentry;
+ fc->mounted = 1;
fc->connected = 1;
kobject_get(&fc->kobj);
file->private_data = fc;