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main: attempt an inode free on releasedir

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if the reference held by the directory is the last one, it would miss
to clean up the inode.  Fix it by calling do_forget.

Closes: https://github.com/containers/fuse-overlayfs/issues/238

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
This commit is contained in:
Giuseppe Scrivano 2020-10-06 09:33:28 +02:00
parent e9cdbc444c
commit 6e2675593c
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GPG Key ID: E4730F97F60286ED
1 changed files with 9 additions and 13 deletions
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22
main.c
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@ -948,18 +948,14 @@ drop_node_from_ino (Hash_table *inodes, struct ovl_node *node)
{ {
struct ovl_ino *ino; struct ovl_ino *ino;
struct ovl_node *it, *prev = NULL; struct ovl_node *it, *prev = NULL;
size_t len = 0;
ino = node->ino; ino = node->ino;
for (it = ino->node; it; it = it->next_link) /* If it is the only node referenced by the inode, do not destroy it. */
len++; if (ino->node == node && node->next_link == NULL)
if (len == 1 && node->ino->lookups > 0)
return; return;
node->ino = NULL; node->ino = NULL;
ino->lookups -= node->node_lookups;
for (it = ino->node; it; it = it->next_link) for (it = ino->node; it; it = it->next_link)
{ {
@ -1161,17 +1157,17 @@ register_inode (struct ovl_data *lo, struct ovl_node *n, mode_t mode)
return ino->node; return ino->node;
} }
static void static bool
do_forget (struct ovl_data *lo, fuse_ino_t ino, uint64_t nlookup) do_forget (struct ovl_data *lo, fuse_ino_t ino, uint64_t nlookup)
{ {
struct ovl_ino *i; struct ovl_ino *i;
if (ino == FUSE_ROOT_ID || ino == 0) if (ino == FUSE_ROOT_ID || ino == 0)
return; return false;
i = lookup_inode (lo, ino); i = lookup_inode (lo, ino);
if (i == NULL) if (i == NULL || i == &dummy_ino)
return; return false;
i->lookups -= nlookup; i->lookups -= nlookup;
if (i->lookups <= 0) if (i->lookups <= 0)
@ -1179,6 +1175,7 @@ do_forget (struct ovl_data *lo, fuse_ino_t ino, uint64_t nlookup)
hash_delete (lo->inodes, i); hash_delete (lo->inodes, i);
inode_free (i); inode_free (i);
} }
return true;
} }
static void static void
@ -2338,6 +2335,7 @@ ovl_releasedir (fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi)
cleanup_lock int l = enter_big_lock (); cleanup_lock int l = enter_big_lock ();
size_t s; size_t s;
struct ovl_dirp *d = ovl_dirp (fi); struct ovl_dirp *d = ovl_dirp (fi);
struct ovl_data *lo = ovl_data (req);
if (UNLIKELY (ovl_debug (req))) if (UNLIKELY (ovl_debug (req)))
fprintf (stderr, "ovl_releasedir(ino=%" PRIu64 ")\n", ino); fprintf (stderr, "ovl_releasedir(ino=%" PRIu64 ")\n", ino);
@ -2345,9 +2343,7 @@ ovl_releasedir (fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi)
for (s = 2; s < d->tbl_size; s++) for (s = 2; s < d->tbl_size; s++)
{ {
d->tbl[s]->node_lookups--; d->tbl[s]->node_lookups--;
if (d->tbl[s]->ino) if (! do_forget (lo, (fuse_ino_t) d->tbl[s]->ino, 1))
d->tbl[s]->ino->lookups--;
else
{ {
if (d->tbl[s]->node_lookups == 0) if (d->tbl[s]->node_lookups == 0)
node_free (d->tbl[s]); node_free (d->tbl[s]);