[PATCH 42/44] btrfs: move fs_info init work into it's own helper function

Josef Bacik
2019-12-06T14:46:57Z

open_ctree mixes initialization of fs stuff and fs_info stuff, which
makes it confusing when doing things like adding the root leak
detection. Make a separate function that init's all the static
structures inside of the fs_info needed for the fs to operate, and then
call that before we start setting up the fs_info to be mounted.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
fs/btrfs/disk-io.c | 164 +++++++++++++++++++++++----------------------
1 file changed, 83 insertions(+), 81 deletions(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index c7163229effc..6151c828a311 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2649,68 +2649,9 @@ static int __cold init_tree_roots(struct btrfs_fs_info *fs_info)
return ret;
}

-int __cold open_ctree(struct super_block *sb,
- struct btrfs_fs_devices *fs_devices,
- char *options)
+static int init_fs_info(struct btrfs_fs_info *fs_info, struct super_block *sb)
{
- u32 sectorsize;
- u32 nodesize;
- u32 stripesize;
- u64 generation;
- u64 features;
- u16 csum_type;
- struct btrfs_key location;
- struct buffer_head *bh;
- struct btrfs_super_block *disk_super;
- struct btrfs_fs_info *fs_info = btrfs_sb(sb);
- struct btrfs_root *tree_root;
- struct btrfs_root *chunk_root;
int ret;
- int err = -EINVAL;
- int clear_free_space_tree = 0;
- int level;
-
- tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info,
- BTRFS_ROOT_TREE_OBJECTID, GFP_KERNEL);
- chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info,
- BTRFS_CHUNK_TREE_OBJECTID, GFP_KERNEL);
- if (!tree_root || !chunk_root) {
- err = -ENOMEM;
- goto fail;
- }
-
- ret = init_srcu_struct(&fs_info->subvol_srcu);
- if (ret) {
- err = ret;
- goto fail;
- }
-
- ret = percpu_counter_init(&fs_info->dio_bytes, 0, GFP_KERNEL);
- if (ret) {
- err = ret;
- goto fail_srcu;
- }
-
- ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0, GFP_KERNEL);
- if (ret) {
- err = ret;
- goto fail_srcu;
- }
- fs_info->dirty_metadata_batch = PAGE_SIZE *
- (1 + ilog2(nr_cpu_ids));
-
- ret = percpu_counter_init(&fs_info->delalloc_bytes, 0, GFP_KERNEL);
- if (ret) {
- err = ret;
- goto fail_srcu;
- }
-
- ret = percpu_counter_init(&fs_info->dev_replace.bio_counter, 0,
- GFP_KERNEL);
- if (ret) {
- err = ret;
- goto fail_srcu;
- }

INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC);
@@ -2774,21 +2715,6 @@ int __cold open_ctree(struct super_block *sb,
INIT_LIST_HEAD(&fs_info->ordered_roots);
spin_lock_init(&fs_info->ordered_root_lock);

- fs_info->btree_inode = new_inode(sb);
- if (!fs_info->btree_inode) {
- err = -ENOMEM;
- goto fail_srcu;
- }
- mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
-
- fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root),
- GFP_KERNEL);
- if (!fs_info->delayed_root) {
- err = -ENOMEM;
- goto fail_iput;
- }
- btrfs_init_delayed_root(fs_info->delayed_root);
-
btrfs_init_scrub(fs_info);
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
fs_info->check_integrity_print_mask = 0;
@@ -2799,8 +2725,6 @@ int __cold open_ctree(struct super_block *sb,
sb->s_blocksize = BTRFS_BDEV_BLOCKSIZE;
sb->s_blocksize_bits = blksize_bits(BTRFS_BDEV_BLOCKSIZE);

- btrfs_init_btree_inode(fs_info);
-
spin_lock_init(&fs_info->block_group_cache_lock);
fs_info->block_group_cache_tree = RB_ROOT;
fs_info->first_logical_byte = (u64)-1;
@@ -2845,12 +2769,91 @@ int __cold open_ctree(struct super_block *sb,

fs_info->send_in_progress = 0;

+ ret = init_srcu_struct(&fs_info->subvol_srcu);
+ if (ret)
+ return ret;
+
+ ret = percpu_counter_init(&fs_info->dio_bytes, 0, GFP_KERNEL);
+ if (ret)
+ goto fail;
+
+ ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0, GFP_KERNEL);
+ if (ret)
+ goto fail;
+
+ fs_info->dirty_metadata_batch = PAGE_SIZE *
+ (1 + ilog2(nr_cpu_ids));
+
+ ret = percpu_counter_init(&fs_info->delalloc_bytes, 0, GFP_KERNEL);
+ if (ret)
+ goto fail;
+
+ ret = percpu_counter_init(&fs_info->dev_replace.bio_counter, 0,
+ GFP_KERNEL);
+ if (ret)
+ goto fail;
+
+ fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root),
+ GFP_KERNEL);
+ if (!fs_info->delayed_root) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+ btrfs_init_delayed_root(fs_info->delayed_root);
+
ret = btrfs_alloc_stripe_hash_table(fs_info);
- if (ret) {
- err = ret;
- goto fail_alloc;
+ if (ret)
+ goto fail;
+
+ return 0;
+fail:
+ cleanup_srcu_struct(&fs_info->subvol_srcu);
+ return ret;
+}
+
+int __cold open_ctree(struct super_block *sb,
+ struct btrfs_fs_devices *fs_devices,
+ char *options)
+{
+ u32 sectorsize;
+ u32 nodesize;
+ u32 stripesize;
+ u64 generation;
+ u64 features;
+ u16 csum_type;
+ struct btrfs_key location;
+ struct buffer_head *bh;
+ struct btrfs_super_block *disk_super;
+ struct btrfs_fs_info *fs_info = btrfs_sb(sb);
+ struct btrfs_root *tree_root;
+ struct btrfs_root *chunk_root;
+ int ret;
+ int err = -EINVAL;
+ int clear_free_space_tree = 0;
+ int level;
+
+ err = init_fs_info(fs_info, sb);
+ if (err)
+ goto fail;
+
+ /* These need to be init'ed before we start creating inodes and such. */
+ tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info,
+ BTRFS_ROOT_TREE_OBJECTID, GFP_KERNEL);
+ chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info,
+ BTRFS_CHUNK_TREE_OBJECTID, GFP_KERNEL);
+ if (!tree_root || !chunk_root) {
+ err = -ENOMEM;
+ goto fail_srcu;
}

+ fs_info->btree_inode = new_inode(sb);
+ if (!fs_info->btree_inode) {
+ err = -ENOMEM;
+ goto fail_srcu;
+ }
+ mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
+ btrfs_init_btree_inode(fs_info);
+
invalidate_bdev(fs_devices->latest_bdev);

/*
@@ -3357,7 +3360,6 @@ int __cold open_ctree(struct super_block *sb,
btrfs_stop_all_workers(fs_info);
btrfs_free_block_groups(fs_info);
fail_alloc:
-fail_iput:
btrfs_mapping_tree_free(&fs_info->mapping_tree);

iput(fs_info->btree_inode);
--
2.23.0