Btrfs: early fsync support
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
parent
7e38180e20
commit
8fd17795b2
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@ -7,6 +7,7 @@
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* Get rid of struct ctree_path, limiting tree levels held at one time
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* Add generation number to key pointer in nodes
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* Add parent pointer back to extent map.
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* Implement real list of pending transactions
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* Release
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* Do real tree locking
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* Add extent mirroring (backup copies of blocks)
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@ -256,6 +256,7 @@ struct btrfs_fs_info {
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struct inode *btree_inode;
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struct mutex trans_mutex;
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struct mutex fs_mutex;
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struct list_head trans_list;
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struct crypto_hash *hash_tfm;
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spinlock_t hash_lock;
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struct kobject kobj;
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@ -528,6 +528,7 @@ struct btrfs_root *open_ctree(struct super_block *sb)
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init_bit_radix(&fs_info->pending_del_radix);
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INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS);
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INIT_RADIX_TREE(&fs_info->dev_radix, GFP_NOFS);
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INIT_LIST_HEAD(&fs_info->trans_list);
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sb_set_blocksize(sb, 4096);
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fs_info->running_transaction = NULL;
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fs_info->tree_root = tree_root;
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@ -100,7 +100,6 @@ int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
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BUG_ON(refs == 0);
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if (refs == 1) {
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ret = btrfs_del_item(trans, root, path);
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printk("deleting root %Lu %Lu %u\n", key->objectid, key->offset, key->flags);
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} else {
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btrfs_set_root_refs(ri, refs - 1);
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printk("ref now %u root %Lu %Lu %u\n", refs -1, key->objectid, key->offset, key->flags);
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@ -11,6 +11,7 @@
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#include <linux/mpage.h>
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#include <linux/swap.h>
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#include <linux/writeback.h>
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#include <linux/statfs.h>
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#include "ctree.h"
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#include "disk-io.h"
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#include "transaction.h"
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@ -932,6 +933,26 @@ out_unlock:
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return err;
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}
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static int btrfs_sync_file(struct file *file,
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struct dentry *dentry, int datasync)
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{
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struct inode *inode = dentry->d_inode;
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struct btrfs_root *root = BTRFS_I(inode)->root;
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int ret;
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struct btrfs_trans_handle *trans;
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mutex_lock(&root->fs_info->fs_mutex);
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trans = btrfs_start_transaction(root, 1);
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if (!trans) {
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ret = -ENOMEM;
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goto out;
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}
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ret = btrfs_commit_transaction(trans, root);
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mutex_unlock(&root->fs_info->fs_mutex);
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out:
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return ret > 0 ? EIO : ret;
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}
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static int btrfs_sync_fs(struct super_block *sb, int wait)
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{
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struct btrfs_trans_handle *trans;
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@ -2353,6 +2374,19 @@ static int btrfs_getattr(struct vfsmount *mnt,
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return 0;
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}
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static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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struct btrfs_root *root = btrfs_sb(dentry->d_sb);
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struct btrfs_super_block *disk_super = root->fs_info->disk_super;
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buf->f_namelen = BTRFS_NAME_LEN;
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buf->f_blocks = btrfs_super_total_blocks(disk_super);
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buf->f_bfree = buf->f_blocks - btrfs_super_blocks_used(disk_super);
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buf->f_bavail = buf->f_bfree;
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buf->f_bsize = dentry->d_sb->s_blocksize;
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buf->f_type = BTRFS_SUPER_MAGIC;
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return 0;
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}
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static struct file_system_type btrfs_fs_type = {
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.owner = THIS_MODULE,
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.name = "btrfs",
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@ -2362,7 +2396,6 @@ static struct file_system_type btrfs_fs_type = {
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};
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static struct super_operations btrfs_super_ops = {
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.statfs = simple_statfs,
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.delete_inode = btrfs_delete_inode,
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.put_super = btrfs_put_super,
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.read_inode = btrfs_read_locked_inode,
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@ -2371,6 +2404,7 @@ static struct super_operations btrfs_super_ops = {
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.write_inode = btrfs_write_inode,
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.alloc_inode = btrfs_alloc_inode,
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.destroy_inode = btrfs_destroy_inode,
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.statfs = btrfs_statfs,
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};
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static struct inode_operations btrfs_dir_inode_operations = {
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@ -2413,6 +2447,7 @@ static struct file_operations btrfs_file_operations = {
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.mmap = generic_file_mmap,
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.open = generic_file_open,
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.ioctl = btrfs_ioctl,
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.fsync = btrfs_sync_file,
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};
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static int __init init_btrfs_fs(void)
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@ -19,6 +19,7 @@ static void put_transaction(struct btrfs_transaction *transaction)
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if (transaction->use_count == 0) {
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WARN_ON(total_trans == 0);
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total_trans--;
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list_del_init(&transaction->list);
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memset(transaction, 0, sizeof(*transaction));
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kmem_cache_free(btrfs_transaction_cachep, transaction);
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}
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@ -43,6 +44,7 @@ static int join_transaction(struct btrfs_root *root)
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cur_trans->in_commit = 0;
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cur_trans->use_count = 1;
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cur_trans->commit_done = 0;
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list_add_tail(&cur_trans->list, &root->fs_info->trans_list);
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}
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cur_trans->num_writers++;
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return 0;
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@ -236,6 +238,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
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{
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int ret = 0;
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struct btrfs_transaction *cur_trans;
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struct btrfs_transaction *prev_trans = NULL;
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struct list_head dirty_fs_roots;
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DEFINE_WAIT(wait);
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@ -272,13 +275,29 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
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BUG_ON(ret);
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cur_trans = root->fs_info->running_transaction;
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root->fs_info->running_transaction = NULL;
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btrfs_set_super_generation(root->fs_info->disk_super,
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root->fs_info->generation + 1);
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if (cur_trans->list.prev != &root->fs_info->trans_list) {
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prev_trans = list_entry(cur_trans->list.prev,
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struct btrfs_transaction, list);
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if (prev_trans->commit_done)
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prev_trans = NULL;
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else
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prev_trans->use_count++;
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}
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mutex_unlock(&root->fs_info->trans_mutex);
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mutex_unlock(&root->fs_info->fs_mutex);
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ret = btrfs_write_and_wait_transaction(trans, root);
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if (prev_trans) {
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mutex_lock(&root->fs_info->trans_mutex);
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wait_for_commit(root, prev_trans);
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put_transaction(prev_trans);
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mutex_unlock(&root->fs_info->trans_mutex);
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}
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btrfs_set_super_generation(root->fs_info->disk_super,
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cur_trans->transid);
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BUG_ON(ret);
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write_ctree_super(trans, root);
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mutex_lock(&root->fs_info->fs_mutex);
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btrfs_finish_extent_commit(trans, root);
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mutex_lock(&root->fs_info->trans_mutex);
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cur_trans->commit_done = 1;
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@ -8,6 +8,7 @@ struct btrfs_transaction {
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int use_count;
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int commit_done;
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int magic;
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struct list_head list;
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wait_queue_head_t writer_wait;
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wait_queue_head_t commit_wait;
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};
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