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btrfs: add fs context handling functions

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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>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik
2023-11-22 12:17:46 -05:00
committed by David Sterba
parent 17b3612022
commit 0f85e244df
1 changed files with 35 additions and 1 deletions
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36
fs/btrfs/super.c
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@@ -2642,10 +2642,44 @@ 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",