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From: Stefan Hajnoczi <stefanha@redhat.com>
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Date: Mon, 27 Jan 2020 19:02:21 +0000
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Subject: [PATCH] virtiofsd: fix lo_destroy() resource leaks
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Now that lo_destroy() is serialized we can call unref_inode() so that
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all inode resources are freed.
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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(cherry picked from commit 28f7a3b026f231bfe8de5fed6a18a8d27b1dfcee)
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---
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tools/virtiofsd/passthrough_ll.c | 41 ++++++++++++++++----------------
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1 file changed, 20 insertions(+), 21 deletions(-)
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diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
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index 79b8b71a4f..eb001b9d1e 100644
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--- a/tools/virtiofsd/passthrough_ll.c
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+++ b/tools/virtiofsd/passthrough_ll.c
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@@ -1371,26 +1371,6 @@ static void unref_inode_lolocked(struct lo_data *lo, struct lo_inode *inode,
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}
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}
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-static int unref_all_inodes_cb(gpointer key, gpointer value, gpointer user_data)
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-{
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- struct lo_inode *inode = value;
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- struct lo_data *lo = user_data;
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-
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- inode->nlookup = 0;
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- lo_map_remove(&lo->ino_map, inode->fuse_ino);
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- close(inode->fd);
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- lo_inode_put(lo, &inode;; /* Drop our refcount from lo_do_lookup() */
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-
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- return TRUE;
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-}
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-
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-static void unref_all_inodes(struct lo_data *lo)
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-{
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- pthread_mutex_lock(&lo->mutex);
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- g_hash_table_foreach_remove(lo->inodes, unref_all_inodes_cb, lo);
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- pthread_mutex_unlock(&lo->mutex);
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-}
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-
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static void lo_forget_one(fuse_req_t req, fuse_ino_t ino, uint64_t nlookup)
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{
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struct lo_data *lo = lo_data(req);
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@@ -2477,7 +2457,26 @@ static void lo_lseek(fuse_req_t req, fuse_ino_t ino, off_t off, int whence,
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static void lo_destroy(void *userdata)
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{
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struct lo_data *lo = (struct lo_data *)userdata;
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- unref_all_inodes(lo);
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+
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+ /*
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+ * Normally lo->mutex must be taken when traversing lo->inodes but
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+ * lo_destroy() is a serialized request so no races are possible here.
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+ *
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+ * In addition, we cannot acquire lo->mutex since unref_inode() takes it
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+ * too and this would result in a recursive lock.
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+ */
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+ while (true) {
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+ GHashTableIter iter;
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+ gpointer key, value;
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+
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+ g_hash_table_iter_init(&iter, lo->inodes);
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+ if (!g_hash_table_iter_next(&iter, &key, &value)) {
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+ break;
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+ }
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+
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+ struct lo_inode *inode = value;
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+ unref_inode_lolocked(lo, inode, inode->nlookup);
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+ }
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}
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static struct fuse_lowlevel_ops lo_oper = {
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