[PATCH v2 10/18] btrfs: add fs context handling functions

Josef Bacik
2023-11-08T19:09:29Z

We are going to use the fs context to hold the mount options, so
allocate the btrfs_fs_context when we're asked to init the fs context,
and free it in the free callback.

Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
fs/btrfs/super.c | 36 +++++++++++++++++++++++++++++++++++-
1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 2f7ee78edd11..facea4632a8d 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -2641,10 +2641,44 @@ static void btrfs_kill_super(struct super_block *sb)
btrfs_free_fs_info(fs_info);
}

-static const struct fs_context_operations btrfs_fs_context_ops __maybe_unused = {
+static void btrfs_free_fs_context(struct fs_context *fc)
+{
+ struct btrfs_fs_context *ctx = fc->fs_private;
+
+ if (!ctx)
+ return;
+
+ kfree(ctx->subvol_name);
+ kfree(ctx);
+}
+
+static const struct fs_context_operations btrfs_fs_context_ops = {
.parse_param = btrfs_parse_param,
+ .free = btrfs_free_fs_context,
};

+static int __maybe_unused btrfs_init_fs_context(struct fs_context *fc)
+{
+ struct btrfs_fs_context *ctx;
+
+ ctx = kzalloc(sizeof(struct btrfs_fs_context), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ctx->thread_pool_size = min_t(unsigned long, num_online_cpus() + 2, 8);
+ ctx->max_inline = BTRFS_DEFAULT_MAX_INLINE;
+ ctx->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
+ ctx->subvol_objectid = BTRFS_FS_TREE_OBJECTID;
+#ifndef CONFIG_BTRFS_FS_POSIX_ACL
+ ctx->noacl = true;
+#endif
+
+ fc->fs_private = ctx;
+ fc->ops = &btrfs_fs_context_ops;
+
+ return 0;
+}
+
static struct file_system_type btrfs_fs_type = {
.owner = THIS_MODULE,
.name = "btrfs",
--
2.41.0