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-rw-r--r--fs/fuse/inode.c81
1 files changed, 75 insertions, 6 deletions
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 74d4f09d5827..2a6d44f91729 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -68,6 +68,24 @@ struct fuse_forget_link *fuse_alloc_forget(void)
return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL_ACCOUNT);
}
+static struct fuse_submount_lookup *fuse_alloc_submount_lookup(void)
+{
+ struct fuse_submount_lookup *sl;
+
+ sl = kzalloc(sizeof(struct fuse_submount_lookup), GFP_KERNEL_ACCOUNT);
+ if (!sl)
+ return NULL;
+ sl->forget = fuse_alloc_forget();
+ if (!sl->forget)
+ goto out_free;
+
+ return sl;
+
+out_free:
+ kfree(sl);
+ return NULL;
+}
+
static struct inode *fuse_alloc_inode(struct super_block *sb)
{
struct fuse_inode *fi;
@@ -83,6 +101,7 @@ static struct inode *fuse_alloc_inode(struct super_block *sb)
fi->attr_version = 0;
fi->orig_ino = 0;
fi->state = 0;
+ fi->submount_lookup = NULL;
mutex_init(&fi->mutex);
spin_lock_init(&fi->lock);
fi->forget = fuse_alloc_forget();
@@ -113,6 +132,17 @@ static void fuse_free_inode(struct inode *inode)
kmem_cache_free(fuse_inode_cachep, fi);
}
+static void fuse_cleanup_submount_lookup(struct fuse_conn *fc,
+ struct fuse_submount_lookup *sl)
+{
+ if (!refcount_dec_and_test(&sl->count))
+ return;
+
+ fuse_queue_forget(fc, sl->forget, sl->nodeid, 1);
+ sl->forget = NULL;
+ kfree(sl);
+}
+
static void fuse_evict_inode(struct inode *inode)
{
struct fuse_inode *fi = get_fuse_inode(inode);
@@ -132,6 +162,11 @@ static void fuse_evict_inode(struct inode *inode)
fi->nlookup);
fi->forget = NULL;
}
+
+ if (fi->submount_lookup) {
+ fuse_cleanup_submount_lookup(fc, fi->submount_lookup);
+ fi->submount_lookup = NULL;
+ }
}
if (S_ISREG(inode->i_mode) && !fuse_is_bad(inode)) {
WARN_ON(!list_empty(&fi->write_files));
@@ -330,6 +365,13 @@ void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
fuse_dax_dontcache(inode, attr->flags);
}
+static void fuse_init_submount_lookup(struct fuse_submount_lookup *sl,
+ u64 nodeid)
+{
+ sl->nodeid = nodeid;
+ refcount_set(&sl->count, 1);
+}
+
static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr,
struct fuse_conn *fc)
{
@@ -392,12 +434,22 @@ struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
*/
if (fc->auto_submounts && (attr->flags & FUSE_ATTR_SUBMOUNT) &&
S_ISDIR(attr->mode)) {
+ struct fuse_inode *fi;
+
inode = new_inode(sb);
if (!inode)
return NULL;
fuse_init_inode(inode, attr, fc);
- get_fuse_inode(inode)->nodeid = nodeid;
+ fi = get_fuse_inode(inode);
+ fi->nodeid = nodeid;
+ fi->submount_lookup = fuse_alloc_submount_lookup();
+ if (!fi->submount_lookup) {
+ iput(inode);
+ return NULL;
+ }
+ /* Sets nlookup = 1 on fi->submount_lookup->nlookup */
+ fuse_init_submount_lookup(fi->submount_lookup, nodeid);
inode->i_flags |= S_AUTOMOUNT;
goto done;
}
@@ -420,11 +472,11 @@ retry:
iput(inode);
goto retry;
}
-done:
fi = get_fuse_inode(inode);
spin_lock(&fi->lock);
fi->nlookup++;
spin_unlock(&fi->lock);
+done:
fuse_change_attributes(inode, attr, NULL, attr_valid, attr_version);
return inode;
@@ -1230,8 +1282,8 @@ static void process_init_reply(struct fuse_mount *fm, struct fuse_args *args,
fc->init_security = 1;
if (flags & FUSE_CREATE_SUPP_GROUP)
fc->create_supp_group = 1;
- if (flags & FUSE_DIRECT_IO_RELAX)
- fc->direct_io_relax = 1;
+ if (flags & FUSE_DIRECT_IO_ALLOW_MMAP)
+ fc->direct_io_allow_mmap = 1;
} else {
ra_pages = fc->max_read / PAGE_SIZE;
fc->no_lock = 1;
@@ -1278,7 +1330,7 @@ void fuse_send_init(struct fuse_mount *fm)
FUSE_NO_OPENDIR_SUPPORT | FUSE_EXPLICIT_INVAL_DATA |
FUSE_HANDLE_KILLPRIV_V2 | FUSE_SETXATTR_EXT | FUSE_INIT_EXT |
FUSE_SECURITY_CTX | FUSE_CREATE_SUPP_GROUP |
- FUSE_HAS_EXPIRE_ONLY | FUSE_DIRECT_IO_RELAX;
+ FUSE_HAS_EXPIRE_ONLY | FUSE_DIRECT_IO_ALLOW_MMAP;
#ifdef CONFIG_FUSE_DAX
if (fm->fc->dax)
flags |= FUSE_MAP_ALIGNMENT;
@@ -1465,6 +1517,8 @@ static int fuse_fill_super_submount(struct super_block *sb,
struct super_block *parent_sb = parent_fi->inode.i_sb;
struct fuse_attr root_attr;
struct inode *root;
+ struct fuse_submount_lookup *sl;
+ struct fuse_inode *fi;
fuse_sb_defaults(sb);
fm->sb = sb;
@@ -1487,12 +1541,27 @@ static int fuse_fill_super_submount(struct super_block *sb,
* its nlookup should not be incremented. fuse_iget() does
* that, though, so undo it here.
*/
- get_fuse_inode(root)->nlookup--;
+ fi = get_fuse_inode(root);
+ fi->nlookup--;
+
sb->s_d_op = &fuse_dentry_operations;
sb->s_root = d_make_root(root);
if (!sb->s_root)
return -ENOMEM;
+ /*
+ * Grab the parent's submount_lookup pointer and take a
+ * reference on the shared nlookup from the parent. This is to
+ * prevent the last forget for this nodeid from getting
+ * triggered until all users have finished with it.
+ */
+ sl = parent_fi->submount_lookup;
+ WARN_ON(!sl);
+ if (sl) {
+ refcount_inc(&sl->count);
+ fi->submount_lookup = sl;
+ }
+
return 0;
}