From 618e21d5957c88c5ea346dfd7d1dbac96410fc5b Mon Sep 17 00:00:00 2001
From: Josef Bacik <jwhiter@redhat.com>
Date: Wed, 11 Jul 2007 10:18:17 -0400
Subject: [PATCH] Btrfs: Implement mknod
Signed-off-by: Chris Mason <chris.mason@oracle.com>
---
fs/btrfs/inode.c | 72 ++++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 66 insertions(+), 6 deletions(-)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index d75ca5cf59b1..f95cf5d4a69d 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -46,6 +46,7 @@ struct btrfs_iget_args {
static struct inode_operations btrfs_dir_inode_operations;
static struct inode_operations btrfs_symlink_inode_operations;
static struct inode_operations btrfs_dir_ro_inode_operations;
+static struct inode_operations btrfs_special_inode_operations;
static struct inode_operations btrfs_file_inode_operations;
static struct address_space_operations btrfs_aops;
static struct address_space_operations btrfs_symlink_aops;
@@ -75,6 +76,7 @@ void btrfs_read_locked_inode(struct inode *inode)
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_key location;
u64 alloc_group_block;
+ u32 rdev;
int ret;
path = btrfs_alloc_path();
@@ -104,6 +106,8 @@ void btrfs_read_locked_inode(struct inode *inode)
inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime);
inode->i_blocks = btrfs_inode_nblocks(inode_item);
inode->i_generation = btrfs_inode_generation(inode_item);
+ inode->i_rdev = 0;
+ rdev = btrfs_inode_rdev(inode_item);
alloc_group_block = btrfs_inode_block_group(inode_item);
BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
alloc_group_block);
@@ -114,12 +118,6 @@ void btrfs_read_locked_inode(struct inode *inode)
mutex_unlock(&root->fs_info->fs_mutex);
switch (inode->i_mode & S_IFMT) {
-#if 0
- default:
- init_special_inode(inode, inode->i_mode,
- btrfs_inode_rdev(inode_item));
- break;
-#endif
case S_IFREG:
inode->i_mapping->a_ops = &btrfs_aops;
inode->i_fop = &btrfs_file_operations;
@@ -136,6 +134,9 @@ void btrfs_read_locked_inode(struct inode *inode)
inode->i_op = &btrfs_symlink_inode_operations;
inode->i_mapping->a_ops = &btrfs_symlink_aops;
break;
+ default:
+ init_special_inode(inode, inode->i_mode, rdev);
+ break;
}
return;
@@ -162,6 +163,7 @@ static void fill_inode_item(struct btrfs_inode_item *item,
btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec);
btrfs_set_inode_nblocks(item, inode->i_blocks);
btrfs_set_inode_generation(item, inode->i_generation);
+ btrfs_set_inode_rdev(item, inode->i_rdev);
btrfs_set_inode_block_group(item,
BTRFS_I(inode)->block_group->key.objectid);
}
@@ -1070,6 +1072,58 @@ static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
return err;
}
+static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
+ int mode, dev_t rdev)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_root *root = BTRFS_I(dir)->root;
+ struct inode *inode;
+ int err;
+ int drop_inode = 0;
+ u64 objectid;
+
+ if (!new_valid_dev(rdev))
+ return -EINVAL;
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, dir);
+
+ err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
+ if (err) {
+ err = -ENOSPC;
+ goto out_unlock;
+ }
+
+ inode = btrfs_new_inode(trans, root, objectid,
+ BTRFS_I(dir)->block_group, mode);
+ err = PTR_ERR(inode);
+ if (IS_ERR(inode))
+ goto out_unlock;
+
+ btrfs_set_trans_block_group(trans, inode);
+ err = btrfs_add_nondir(trans, dentry, inode);
+ if (err)
+ drop_inode = 1;
+ else {
+ inode->i_op = &btrfs_special_inode_operations;
+ init_special_inode(inode, inode->i_mode, rdev);
+ }
+ dir->i_sb->s_dirt = 1;
+ btrfs_update_inode_block_group(trans, inode);
+ btrfs_update_inode_block_group(trans, dir);
+out_unlock:
+ btrfs_end_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+
+ if (drop_inode) {
+ inode_dec_link_count(inode);
+ iput(inode);
+ }
+ btrfs_btree_balance_dirty(root);
+ return err;
+}
+
static int btrfs_create(struct inode *dir, struct dentry *dentry,
int mode, struct nameidata *nd)
{
@@ -2526,6 +2580,7 @@ static struct inode_operations btrfs_dir_inode_operations = {
.rename = btrfs_rename,
.symlink = btrfs_symlink,
.setattr = btrfs_setattr,
+ .mknod = btrfs_mknod,
};
static struct inode_operations btrfs_dir_ro_inode_operations = {
@@ -2562,6 +2617,11 @@ static struct inode_operations btrfs_file_inode_operations = {
.setattr = btrfs_setattr,
};
+static struct inode_operations btrfs_special_inode_operations = {
+ .getattr = btrfs_getattr,
+ .setattr = btrfs_setattr,
+};
+
static struct inode_operations btrfs_symlink_inode_operations = {
.readlink = generic_readlink,
.follow_link = page_follow_link_light,
--
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