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virtiofsd: fix lo_destroy() resource leaks

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Now that lo_destroy() is serialized we can call unref_inode() so that
all inode resources are freed.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2019-08-01 17:54:08 +01:00 committed by Dr. David Alan Gilbert
parent cdc497c692
commit 28f7a3b026
1 changed files with 20 additions and 21 deletions
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41
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,
}
}
static int unref_all_inodes_cb(gpointer key, gpointer value, gpointer user_data)
{
struct lo_inode *inode = value;
struct lo_data *lo = user_data;
inode->nlookup = 0;
lo_map_remove(&lo->ino_map, inode->fuse_ino);
close(inode->fd);
lo_inode_put(lo, &inode); /* Drop our refcount from lo_do_lookup() */
return TRUE;
}
static void unref_all_inodes(struct lo_data *lo)
{
pthread_mutex_lock(&lo->mutex);
g_hash_table_foreach_remove(lo->inodes, unref_all_inodes_cb, lo);
pthread_mutex_unlock(&lo->mutex);
}
static void lo_forget_one(fuse_req_t req, fuse_ino_t ino, uint64_t nlookup)
{
struct lo_data *lo = lo_data(req);
@ -2477,7 +2457,26 @@ static void lo_lseek(fuse_req_t req, fuse_ino_t ino, off_t off, int whence,
static void lo_destroy(void *userdata)
{
struct lo_data *lo = (struct lo_data *)userdata;
unref_all_inodes(lo);
/*
* Normally lo->mutex must be taken when traversing lo->inodes but
* lo_destroy() is a serialized request so no races are possible here.
*
* In addition, we cannot acquire lo->mutex since unref_inode() takes it
* too and this would result in a recursive lock.
*/
while (true) {
GHashTableIter iter;
gpointer key, value;
g_hash_table_iter_init(&iter, lo->inodes);
if (!g_hash_table_iter_next(&iter, &key, &value)) {
break;
}
struct lo_inode *inode = value;
unref_inode_lolocked(lo, inode, inode->nlookup);
}
}
static struct fuse_lowlevel_ops lo_oper = {