#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
+#include "btrfs_inode.h"
+#include "ioctl.h"
+
+void btrfs_fsinfo_release(struct kobject *obj)
+{
+ struct btrfs_fs_info *fsinfo = container_of(obj,
+ struct btrfs_fs_info, kobj);
+ kfree(fsinfo);
+}
+
+struct kobj_type btrfs_fsinfo_ktype = {
+ .release = btrfs_fsinfo_release,
+};
+
+struct btrfs_iget_args {
+ u64 ino;
+ struct btrfs_root *root;
+};
+
+decl_subsys(btrfs, &btrfs_fsinfo_ktype, NULL);
#define BTRFS_SUPER_MAGIC 0x9123682E
static struct inode_operations btrfs_dir_inode_operations;
+static struct inode_operations btrfs_dir_ro_inode_operations;
static struct super_operations btrfs_super_ops;
static struct file_operations btrfs_dir_file_operations;
static struct inode_operations btrfs_file_inode_operations;
static void btrfs_read_locked_inode(struct inode *inode)
{
- struct btrfs_path path;
+ struct btrfs_path *path;
struct btrfs_inode_item *inode_item;
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct btrfs_key location;
int ret;
- btrfs_init_path(&path);
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ btrfs_init_path(path);
mutex_lock(&root->fs_info->fs_mutex);
- ret = btrfs_lookup_inode(NULL, root, &path, inode->i_ino, 0);
+ memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
+ ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
if (ret) {
- btrfs_release_path(root, &path);
- mutex_unlock(&root->fs_info->fs_mutex);
- make_bad_inode(inode);
- return;
+ btrfs_free_path(path);
+ goto make_bad;
}
- inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
- path.slots[0],
+ inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
+ path->slots[0],
struct btrfs_inode_item);
inode->i_mode = btrfs_inode_mode(inode_item);
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);
- btrfs_release_path(root, &path);
+
+ btrfs_free_path(path);
+ inode_item = NULL;
+
mutex_unlock(&root->fs_info->fs_mutex);
+
switch (inode->i_mode & S_IFMT) {
#if 0
default:
inode->i_op = &btrfs_file_inode_operations;
break;
case S_IFDIR:
- inode->i_op = &btrfs_dir_inode_operations;
inode->i_fop = &btrfs_dir_file_operations;
+ if (root == root->fs_info->tree_root)
+ inode->i_op = &btrfs_dir_ro_inode_operations;
+ else
+ inode->i_op = &btrfs_dir_inode_operations;
break;
case S_IFLNK:
// inode->i_op = &page_symlink_inode_operations;
break;
}
return;
+
+make_bad:
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ make_bad_inode(inode);
}
static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
struct inode *dir,
struct dentry *dentry)
{
- struct btrfs_path path;
+ struct btrfs_path *path;
const char *name = dentry->d_name.name;
int name_len = dentry->d_name.len;
int ret;
u64 objectid;
struct btrfs_dir_item *di;
- btrfs_init_path(&path);
- ret = btrfs_lookup_dir_item(trans, root, &path, dir->i_ino,
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ btrfs_init_path(path);
+ ret = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
name, name_len, -1);
if (ret < 0)
goto err;
ret = -ENOENT;
goto err;
}
- di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
+ di = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
struct btrfs_dir_item);
- objectid = btrfs_dir_objectid(di);
+ objectid = btrfs_disk_key_objectid(&di->location);
- ret = btrfs_del_item(trans, root, &path);
+ ret = btrfs_del_item(trans, root, path);
+ BUG_ON(ret);
+
+ btrfs_release_path(root, path);
+ ret = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
+ objectid, -1);
+ BUG_ON(ret);
+ ret = btrfs_del_item(trans, root, path);
BUG_ON(ret);
dentry->d_inode->i_ctime = dir->i_ctime;
err:
- btrfs_release_path(root, &path);
- if (ret == 0)
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
+ if (ret == 0) {
inode_dec_link_count(dentry->d_inode);
+ dir->i_size -= name_len * 2;
+ mark_inode_dirty(dir);
+ }
return ret;
}
struct btrfs_trans_handle *trans;
int ret;
- root = btrfs_sb(dir->i_sb);
+ root = BTRFS_I(dir)->root;
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
ret = btrfs_unlink_trans(trans, root, dir, dentry);
struct inode *inode = dentry->d_inode;
int err;
int ret;
- struct btrfs_root *root = btrfs_sb(dir->i_sb);
- struct btrfs_path path;
+ struct btrfs_root *root = BTRFS_I(dir)->root;
+ struct btrfs_path *path;
struct btrfs_key key;
struct btrfs_trans_handle *trans;
- struct btrfs_disk_key *found_key;
+ struct btrfs_key found_key;
+ int found_type;
struct btrfs_leaf *leaf;
+ char *goodnames = "..";
- btrfs_init_path(&path);
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ btrfs_init_path(path);
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
key.objectid = inode->i_ino;
key.offset = (u64)-1;
- key.flags = 0;
- btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
- ret = btrfs_search_slot(trans, root, &key, &path, -1, 1);
- if (ret < 0) {
- err = ret;
- goto out;
- }
+ key.flags = (u32)-1;
+ while(1) {
+ ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
+ if (ret < 0) {
+ err = ret;
+ goto out;
+ }
+ BUG_ON(ret == 0);
+ if (path->slots[0] == 0) {
+ err = -ENOENT;
+ goto out;
+ }
+ path->slots[0]--;
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
+ btrfs_disk_key_to_cpu(&found_key,
+ &leaf->items[path->slots[0]].key);
+ found_type = btrfs_key_type(&found_key);
+ if (found_key.objectid != inode->i_ino) {
+ err = -ENOENT;
+ goto out;
+ }
+ if ((found_type != BTRFS_DIR_ITEM_KEY &&
+ found_type != BTRFS_DIR_INDEX_KEY) ||
+ (!btrfs_match_dir_item_name(root, path, goodnames, 2) &&
+ !btrfs_match_dir_item_name(root, path, goodnames, 1))) {
+ err = -ENOTEMPTY;
+ goto out;
+ }
+ ret = btrfs_del_item(trans, root, path);
+ BUG_ON(ret);
- BUG_ON(ret == 0);
- BUG_ON(path.slots[0] == 0);
- path.slots[0]--;
- leaf = btrfs_buffer_leaf(path.nodes[0]);
- found_key = &leaf->items[path.slots[0]].key;
- if (btrfs_disk_key_objectid(found_key) != inode->i_ino) {
- err = -ENOENT;
- goto out;
- }
- if (btrfs_disk_key_type(found_key) != BTRFS_DIR_ITEM_KEY ||
- btrfs_disk_key_offset(found_key) != 2) {
- err = -ENOTEMPTY;
- goto out;
- }
- ret = btrfs_del_item(trans, root, &path);
- BUG_ON(ret);
- btrfs_release_path(root, &path);
- key.offset = 1;
- ret = btrfs_search_slot(trans, root, &key, &path, -1, 1);
- if (ret < 0) {
- err = ret;
- goto out;
- }
- if (ret > 0) {
- err = -ENOTEMPTY;
- goto out;
- }
- ret = btrfs_del_item(trans, root, &path);
- if (ret) {
- err = ret;
- goto out;
+ if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1)
+ break;
+ btrfs_release_path(root, path);
}
- btrfs_release_path(root, &path);
+ ret = 0;
+ btrfs_release_path(root, path);
/* now the directory is empty */
err = btrfs_unlink_trans(trans, root, dir, dentry);
inode->i_size = 0;
}
out:
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
mutex_unlock(&root->fs_info->fs_mutex);
ret = btrfs_end_transaction(trans, root);
if (ret && !err)
struct btrfs_root *root,
struct inode *inode)
{
- u64 objectid = inode->i_ino;
- struct btrfs_path path;
- struct btrfs_inode_map_item *map;
- struct btrfs_key stat_data_key;
+ struct btrfs_path *path;
int ret;
+
clear_inode(inode);
- btrfs_init_path(&path);
- ret = btrfs_lookup_inode_map(trans, root, &path, objectid, -1);
- if (ret) {
- if (ret > 0)
- ret = -ENOENT;
- btrfs_release_path(root, &path);
- goto error;
- }
- map = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
- struct btrfs_inode_map_item);
- btrfs_disk_key_to_cpu(&stat_data_key, &map->key);
- ret = btrfs_del_item(trans, root->fs_info->inode_root, &path);
- BUG_ON(ret);
- btrfs_release_path(root, &path);
- btrfs_init_path(&path);
- ret = btrfs_lookup_inode(trans, root, &path, objectid, -1);
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ btrfs_init_path(path);
+ ret = btrfs_lookup_inode(trans, root, path,
+ &BTRFS_I(inode)->location, -1);
BUG_ON(ret);
- ret = btrfs_del_item(trans, root, &path);
+ ret = btrfs_del_item(trans, root, path);
BUG_ON(ret);
- btrfs_release_path(root, &path);
-error:
+ btrfs_free_path(path);
return ret;
}
struct inode *inode)
{
int ret;
- struct btrfs_path path;
+ struct btrfs_path *path;
struct btrfs_key key;
struct btrfs_disk_key *found_key;
struct btrfs_leaf *leaf;
- struct btrfs_file_extent_item *fi;
- u64 extent_start;
- u64 extent_num_blocks;
+ struct btrfs_file_extent_item *fi = NULL;
+ u64 extent_start = 0;
+ u64 extent_num_blocks = 0;
+ int found_extent;
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
/* FIXME, add redo link to tree so we don't leak on crash */
key.objectid = inode->i_ino;
key.offset = (u64)-1;
key.flags = 0;
- btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
+ /*
+ * use BTRFS_CSUM_ITEM_KEY because it is larger than inline keys
+ * or extent data
+ */
+ btrfs_set_key_type(&key, BTRFS_CSUM_ITEM_KEY);
while(1) {
- btrfs_init_path(&path);
- ret = btrfs_search_slot(trans, root, &key, &path, -1, 1);
+ btrfs_init_path(path);
+ ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret < 0) {
- btrfs_release_path(root, &path);
goto error;
}
if (ret > 0) {
- BUG_ON(path.slots[0] == 0);
- path.slots[0]--;
+ BUG_ON(path->slots[0] == 0);
+ path->slots[0]--;
}
- leaf = btrfs_buffer_leaf(path.nodes[0]);
- found_key = &leaf->items[path.slots[0]].key;
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
+ found_key = &leaf->items[path->slots[0]].key;
if (btrfs_disk_key_objectid(found_key) != inode->i_ino)
break;
- if (btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY)
+ if (btrfs_disk_key_type(found_key) != BTRFS_CSUM_ITEM_KEY &&
+ btrfs_disk_key_type(found_key) != BTRFS_INLINE_DATA_KEY &&
+ btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY)
break;
if (btrfs_disk_key_offset(found_key) < inode->i_size)
break;
- fi = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
- path.slots[0],
- struct btrfs_file_extent_item);
- extent_start = btrfs_file_extent_disk_blocknr(fi);
- extent_num_blocks = btrfs_file_extent_disk_num_blocks(fi);
- key.offset = btrfs_disk_key_offset(found_key) - 1;
- ret = btrfs_del_item(trans, root, &path);
- BUG_ON(ret);
- inode->i_blocks -= btrfs_file_extent_num_blocks(fi) >> 9;
- btrfs_release_path(root, &path);
- ret = btrfs_free_extent(trans, root, extent_start,
- extent_num_blocks, 0);
+ if (btrfs_disk_key_type(found_key) == BTRFS_EXTENT_DATA_KEY) {
+ fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
+ path->slots[0],
+ struct btrfs_file_extent_item);
+ extent_start = btrfs_file_extent_disk_blocknr(fi);
+ extent_num_blocks =
+ btrfs_file_extent_disk_num_blocks(fi);
+ inode->i_blocks -=
+ btrfs_file_extent_num_blocks(fi) >> 9;
+ found_extent = 1;
+ } else {
+ found_extent = 0;
+ }
+ ret = btrfs_del_item(trans, root, path);
BUG_ON(ret);
- if (key.offset + 1 == 0)
- break;
+ btrfs_release_path(root, path);
+ if (found_extent) {
+ ret = btrfs_free_extent(trans, root, extent_start,
+ extent_num_blocks, 0);
+ BUG_ON(ret);
+ }
}
- btrfs_release_path(root, &path);
ret = 0;
error:
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
return ret;
}
static void btrfs_delete_inode(struct inode *inode)
{
struct btrfs_trans_handle *trans;
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_root *root = BTRFS_I(inode)->root;
int ret;
truncate_inode_pages(&inode->i_data, 0);
}
static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
- ino_t *ino)
+ struct btrfs_key *location)
{
const char *name = dentry->d_name.name;
int namelen = dentry->d_name.len;
struct btrfs_dir_item *di;
- struct btrfs_path path;
- struct btrfs_root *root = btrfs_sb(dir->i_sb);
+ struct btrfs_path *path;
+ struct btrfs_root *root = BTRFS_I(dir)->root;
int ret;
- btrfs_init_path(&path);
- ret = btrfs_lookup_dir_item(NULL, root, &path, dir->i_ino, name,
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ btrfs_init_path(path);
+ ret = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
namelen, 0);
- if (ret || !btrfs_match_dir_item_name(root, &path, name, namelen)) {
- *ino = 0;
+ if (ret || !btrfs_match_dir_item_name(root, path, name, namelen)) {
+ location->objectid = 0;
+ ret = 0;
goto out;
}
- di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
+ di = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
struct btrfs_dir_item);
- *ino = btrfs_dir_objectid(di);
+ btrfs_disk_key_to_cpu(location, &di->location);
out:
- btrfs_release_path(root, &path);
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
return ret;
}
+int fixup_tree_root_location(struct btrfs_root *root,
+ struct btrfs_key *location,
+ struct btrfs_root **sub_root)
+{
+ struct btrfs_path *path;
+ struct btrfs_root_item *ri;
+
+ if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
+ return 0;
+ if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
+ return 0;
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ mutex_lock(&root->fs_info->fs_mutex);
+
+ *sub_root = btrfs_read_fs_root(root->fs_info, location);
+ if (IS_ERR(*sub_root))
+ return PTR_ERR(*sub_root);
+
+ ri = &(*sub_root)->root_item;
+ location->objectid = btrfs_root_dirid(ri);
+ location->flags = 0;
+ btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
+ location->offset = 0;
+
+ btrfs_free_path(path);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return 0;
+}
+
+int btrfs_init_locked_inode(struct inode *inode, void *p)
+{
+ struct btrfs_iget_args *args = p;
+ inode->i_ino = args->ino;
+ BTRFS_I(inode)->root = args->root;
+ return 0;
+}
+
+int btrfs_find_actor(struct inode *inode, void *opaque)
+{
+ struct btrfs_iget_args *args = opaque;
+ return (args->ino == inode->i_ino &&
+ args->root == BTRFS_I(inode)->root);
+}
+
+struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
+ struct btrfs_root *root)
+{
+ struct inode *inode;
+ struct btrfs_iget_args args;
+ args.ino = objectid;
+ args.root = root;
+
+ inode = iget5_locked(s, objectid, btrfs_find_actor,
+ btrfs_init_locked_inode,
+ (void *)&args);
+ return inode;
+}
+
static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
{
struct inode * inode;
- ino_t ino;
+ struct btrfs_inode *bi = BTRFS_I(dir);
+ struct btrfs_root *root = bi->root;
+ struct btrfs_root *sub_root = root;
+ struct btrfs_key location;
int ret;
if (dentry->d_name.len > BTRFS_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
-
- ret = btrfs_inode_by_name(dir, dentry, &ino);
+ mutex_lock(&root->fs_info->fs_mutex);
+ ret = btrfs_inode_by_name(dir, dentry, &location);
+ mutex_unlock(&root->fs_info->fs_mutex);
if (ret < 0)
return ERR_PTR(ret);
inode = NULL;
- if (ino) {
- inode = iget(dir->i_sb, ino);
+ if (location.objectid) {
+ ret = fixup_tree_root_location(root, &location, &sub_root);
+ if (ret < 0)
+ return ERR_PTR(ret);
+ if (ret > 0)
+ return ERR_PTR(-ENOENT);
+ inode = btrfs_iget_locked(dir->i_sb, location.objectid,
+ sub_root);
if (!inode)
return ERR_PTR(-EACCES);
+ if (inode->i_state & I_NEW) {
+ if (sub_root != root) {
+ ret = radix_tree_insert(
+ &root->fs_info->fs_roots_radix,
+ (unsigned long)sub_root,
+ sub_root);
+printk("adding new root for inode %lu root %p (found %p)\n", inode->i_ino, sub_root, BTRFS_I(inode)->root);
+ igrab(inode);
+ sub_root->inode = inode;
+ }
+ BTRFS_I(inode)->root = sub_root;
+ memcpy(&BTRFS_I(inode)->location, &location,
+ sizeof(location));
+ btrfs_read_locked_inode(inode);
+ unlock_new_inode(inode);
+ }
}
return d_splice_alias(inode, dentry);
}
static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
struct inode *inode = filp->f_path.dentry->d_inode;
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_item *item;
struct btrfs_dir_item *di;
struct btrfs_key key;
- struct btrfs_path path;
+ struct btrfs_path *path;
int ret;
u32 nritems;
struct btrfs_leaf *leaf;
int advance;
unsigned char d_type = DT_UNKNOWN;
int over = 0;
+ int key_type = BTRFS_DIR_INDEX_KEY;
+ /* FIXME, use a real flag for deciding about the key type */
+ if (root->fs_info->tree_root == root)
+ key_type = BTRFS_DIR_ITEM_KEY;
+ mutex_lock(&root->fs_info->fs_mutex);
key.objectid = inode->i_ino;
key.flags = 0;
- btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
+ btrfs_set_key_type(&key, key_type);
key.offset = filp->f_pos;
- btrfs_init_path(&path);
- ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
- if (ret < 0) {
+ path = btrfs_alloc_path();
+ btrfs_init_path(path);
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ if (ret < 0)
goto err;
- }
advance = 0;
while(1) {
- leaf = btrfs_buffer_leaf(path.nodes[0]);
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
nritems = btrfs_header_nritems(&leaf->header);
- slot = path.slots[0];
+ slot = path->slots[0];
if (advance || slot >= nritems) {
if (slot >= nritems -1) {
- ret = btrfs_next_leaf(root, &path);
+ ret = btrfs_next_leaf(root, path);
if (ret)
break;
- leaf = btrfs_buffer_leaf(path.nodes[0]);
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
nritems = btrfs_header_nritems(&leaf->header);
- slot = path.slots[0];
+ slot = path->slots[0];
} else {
slot++;
- path.slots[0]++;
+ path->slots[0]++;
}
}
advance = 1;
item = leaf->items + slot;
if (btrfs_disk_key_objectid(&item->key) != key.objectid)
break;
- if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_ITEM_KEY)
+ if (key_type == BTRFS_DIR_INDEX_KEY &&
+ btrfs_disk_key_offset(&item->key) > root->highest_inode)
+ break;
+ if (btrfs_disk_key_type(&item->key) != key_type)
continue;
if (btrfs_disk_key_offset(&item->key) < filp->f_pos)
continue;
-
+ filp->f_pos = btrfs_disk_key_offset(&item->key);
advance = 1;
di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
over = filldir(dirent, (const char *)(di + 1),
btrfs_dir_name_len(di),
btrfs_disk_key_offset(&item->key),
- btrfs_dir_objectid(di), d_type);
- if (over) {
- filp->f_pos = btrfs_disk_key_offset(&item->key);
- break;
- }
- filp->f_pos = btrfs_disk_key_offset(&item->key) + 1;
+ btrfs_disk_key_objectid(&di->location), d_type);
+ if (over)
+ goto nopos;
}
+ filp->f_pos++;
+nopos:
ret = 0;
err:
- btrfs_release_path(root, &path);
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
+ mutex_unlock(&root->fs_info->fs_mutex);
return ret;
}
struct inode * inode;
struct dentry * root_dentry;
struct btrfs_super_block *disk_super;
- struct buffer_head *bh;
- struct btrfs_root *root;
+ struct btrfs_root *tree_root;
+ struct btrfs_inode *bi;
sb->s_maxbytes = MAX_LFS_FILESIZE;
- sb->s_blocksize = PAGE_CACHE_SIZE;
- sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
sb->s_magic = BTRFS_SUPER_MAGIC;
sb->s_op = &btrfs_super_ops;
sb->s_time_gran = 1;
- bh = sb_bread(sb, BTRFS_SUPER_INFO_OFFSET / sb->s_blocksize);
- if (!bh) {
- printk("btrfs: unable to read on disk super\n");
- return -EIO;
- }
- disk_super = (struct btrfs_super_block *)bh->b_data;
- root = open_ctree(sb, bh, disk_super);
+ tree_root = open_ctree(sb);
- if (!root) {
+ if (!tree_root) {
printk("btrfs: open_ctree failed\n");
return -EIO;
}
- sb->s_fs_info = root;
- disk_super = root->fs_info->disk_super;
+ sb->s_fs_info = tree_root;
+ disk_super = tree_root->fs_info->disk_super;
printk("read in super total blocks %Lu root %Lu\n",
btrfs_super_total_blocks(disk_super),
btrfs_super_root_dir(disk_super));
- inode = iget_locked(sb, btrfs_super_root_dir(disk_super));
+ inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super),
+ tree_root);
+ bi = BTRFS_I(inode);
+ bi->location.objectid = inode->i_ino;
+ bi->location.offset = 0;
+ bi->location.flags = 0;
+ bi->root = tree_root;
+ btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY);
+
if (!inode)
return -ENOMEM;
if (inode->i_state & I_NEW) {
struct inode *inode)
{
struct btrfs_inode_item *inode_item;
- struct btrfs_path path;
+ struct btrfs_path *path;
int ret;
- btrfs_init_path(&path);
-
- ret = btrfs_lookup_inode(trans, root, &path, inode->i_ino, 1);
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ btrfs_init_path(path);
+ ret = btrfs_lookup_inode(trans, root, path,
+ &BTRFS_I(inode)->location, 1);
if (ret) {
if (ret > 0)
ret = -ENOENT;
goto failed;
}
- inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
- path.slots[0],
+ inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
+ path->slots[0],
struct btrfs_inode_item);
fill_inode_item(inode_item, inode);
- mark_buffer_dirty(path.nodes[0]);
+ btrfs_mark_buffer_dirty(path->nodes[0]);
+ ret = 0;
failed:
- btrfs_release_path(root, &path);
- return 0;
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
+ return ret;
}
static int btrfs_write_inode(struct inode *inode, int wait)
{
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans;
int ret;
{
struct inode *inode;
struct btrfs_inode_item inode_item;
- struct btrfs_root *root = btrfs_sb(dir->i_sb);
- struct btrfs_key key;
+ struct btrfs_root *root = BTRFS_I(dir)->root;
+ struct btrfs_key *location;
int ret;
u64 objectid;
if (!inode)
return ERR_PTR(-ENOMEM);
+ BTRFS_I(inode)->root = BTRFS_I(dir)->root;
ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
BUG_ON(ret);
inode->i_mode = mode;
inode->i_ino = objectid;
inode->i_blocks = 0;
- inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
+ inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
fill_inode_item(&inode_item, inode);
-
- key.objectid = objectid;
- key.flags = 0;
- key.offset = 0;
- btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
- ret = btrfs_insert_inode_map(trans, root, objectid, &key);
- BUG_ON(ret);
+ location = &BTRFS_I(inode)->location;
+ location->objectid = objectid;
+ location->flags = 0;
+ location->offset = 0;
+ btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
BUG_ON(ret);
struct dentry *dentry, struct inode *inode)
{
int ret;
- ret = btrfs_insert_dir_item(trans, btrfs_sb(inode->i_sb),
+ struct btrfs_key key;
+ struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
+ key.objectid = inode->i_ino;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
+ key.offset = 0;
+
+ ret = btrfs_insert_dir_item(trans, root,
dentry->d_name.name, dentry->d_name.len,
dentry->d_parent->d_inode->i_ino,
- inode->i_ino, 0);
+ &key, 0);
if (ret == 0) {
- dentry->d_parent->d_inode->i_size += dentry->d_name.len;
- ret = btrfs_update_inode(trans, btrfs_sb(inode->i_sb),
+ dentry->d_parent->d_inode->i_size += dentry->d_name.len * 2;
+ ret = btrfs_update_inode(trans, root,
dentry->d_parent->d_inode);
}
-
return ret;
}
d_instantiate(dentry, inode);
return 0;
}
+ if (err > 0)
+ err = -EEXIST;
return err;
}
int mode, struct nameidata *nd)
{
struct btrfs_trans_handle *trans;
- struct btrfs_root *root = btrfs_sb(dir->i_sb);
+ struct btrfs_root *root = BTRFS_I(dir)->root;
struct inode *inode;
int err;
int drop_inode = 0;
inode->i_op = &btrfs_file_inode_operations;
}
dir->i_sb->s_dirt = 1;
- btrfs_end_transaction(trans, root);
out_unlock:
+ btrfs_end_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
+
if (drop_inode) {
inode_dec_link_count(inode);
iput(inode);
static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans,
struct inode *inode, struct inode *dir)
{
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_root *root = BTRFS_I(dir)->root;
int ret;
char buf[2];
+ struct btrfs_key key;
+
buf[0] = '.';
buf[1] = '.';
+ key.objectid = inode->i_ino;
+ key.offset = 0;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
+
ret = btrfs_insert_dir_item(trans, root, buf, 1, inode->i_ino,
- inode->i_ino, 1);
+ &key, 1);
if (ret)
goto error;
+ key.objectid = dir->i_ino;
ret = btrfs_insert_dir_item(trans, root, buf, 2, inode->i_ino,
- dir->i_ino, 1);
+ &key, 1);
if (ret)
goto error;
- inode->i_size = 3;
+ inode->i_size = 6;
ret = btrfs_update_inode(trans, root, inode);
error:
return ret;
{
struct inode *inode;
struct btrfs_trans_handle *trans;
- struct btrfs_root *root = btrfs_sb(dir->i_sb);
+ struct btrfs_root *root = BTRFS_I(dir)->root;
int err = 0;
int drop_on_err = 0;
return 0;
}
filemap_write_and_wait(root->fs_info->btree_inode->i_mapping);
-
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
ret = btrfs_commit_transaction(trans, root);
return 0;
}
+#if 0
+static int btrfs_get_block_inline(struct inode *inode, sector_t iblock,
+ struct buffer_head *result, int create)
+{
+ struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_path *path;
+ struct btrfs_key key;
+ struct btrfs_leaf *leaf;
+ int num_bytes = result->b_size;
+ int item_size;
+ int ret;
+ u64 pos;
+ char *ptr;
+ int copy_size;
+ int err = 0;
+ char *safe_ptr;
+ char *data_ptr;
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+
+ WARN_ON(create);
+ if (create) {
+ return 0;
+ }
+ pos = iblock << inode->i_blkbits;
+ key.objectid = inode->i_ino;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_INLINE_DATA_KEY);
+ ptr = kmap(result->b_page);
+ safe_ptr = ptr;
+ ptr += (pos & (PAGE_CACHE_SIZE -1));
+again:
+ key.offset = pos;
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ if (ret) {
+ if (ret < 0)
+ err = ret;
+ else
+ err = 0;
+ goto out;
+ }
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
+ item_size = btrfs_item_size(leaf->items + path->slots[0]);
+ copy_size = min(num_bytes, item_size);
+ data_ptr = btrfs_item_ptr(leaf, path->slots[0], char);
+ WARN_ON(safe_ptr + PAGE_CACHE_SIZE < ptr + copy_size);
+ memcpy(ptr, data_ptr, copy_size);
+ pos += copy_size;
+ num_bytes -= copy_size;
+ WARN_ON(num_bytes < 0);
+ ptr += copy_size;
+ btrfs_release_path(root, path);
+ if (num_bytes != 0) {
+ if (pos >= i_size_read(inode))
+ memset(ptr, 0, num_bytes);
+ else
+ goto again;
+ }
+ set_buffer_uptodate(result);
+ map_bh(result, inode->i_sb, 0);
+ err = 0;
+out:
+ btrfs_free_path(path);
+ kunmap(result->b_page);
+ return err;
+}
+#endif
+
static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
struct buffer_head *result, int create)
{
u64 extent_start = 0;
u64 extent_end = 0;
u64 objectid = inode->i_ino;
- struct btrfs_path path;
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_path *path;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans = NULL;
struct btrfs_file_extent_item *item;
struct btrfs_leaf *leaf;
struct btrfs_disk_key *found_key;
- btrfs_init_path(&path);
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ btrfs_init_path(path);
if (create)
trans = btrfs_start_transaction(root, 1);
-
- ret = btrfs_lookup_file_extent(trans, root, &path,
+ ret = btrfs_lookup_file_extent(trans, root, path,
inode->i_ino,
iblock << inode->i_blkbits, 0);
if (ret < 0) {
- btrfs_release_path(root, &path);
err = ret;
goto out;
}
if (ret != 0) {
- if (path.slots[0] == 0) {
- btrfs_release_path(root, &path);
+ if (path->slots[0] == 0) {
+ btrfs_release_path(root, path);
goto allocate;
}
- path.slots[0]--;
+ path->slots[0]--;
}
- item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
+ item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
struct btrfs_file_extent_item);
- leaf = btrfs_buffer_leaf(path.nodes[0]);
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
blocknr = btrfs_file_extent_disk_blocknr(item);
blocknr += btrfs_file_extent_offset(item);
if (ret == 0) {
err = 0;
map_bh(result, inode->i_sb, blocknr);
- btrfs_release_path(root, &path);
goto out;
}
/* are we inside the extent that was found? */
- found_key = &leaf->items[path.slots[0]].key;
+ found_key = &leaf->items[path->slots[0]].key;
if (btrfs_disk_key_objectid(found_key) != objectid ||
btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) {
extent_end = 0;
extent_start = 0;
- btrfs_release_path(root, &path);
+ btrfs_release_path(root, path);
goto allocate;
}
- extent_start = btrfs_disk_key_offset(&leaf->items[path.slots[0]].key);
+ extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key);
extent_start = extent_start >> inode->i_blkbits;
extent_start += btrfs_file_extent_offset(item);
extent_end = extent_start + btrfs_file_extent_num_blocks(item);
- btrfs_release_path(root, &path);
if (iblock >= extent_start && iblock < extent_end) {
err = 0;
map_bh(result, inode->i_sb, blocknr + iblock - extent_start);
map_bh(result, inode->i_sb, blocknr);
out:
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
if (trans)
btrfs_end_transaction(trans, root);
return err;
struct buffer_head *result, int create)
{
int err;
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_root *root = BTRFS_I(inode)->root;
mutex_lock(&root->fs_info->fs_mutex);
err = btrfs_get_block_lock(inode, iblock, result, create);
+ // err = btrfs_get_block_inline(inode, iblock, result, create);
mutex_unlock(&root->fs_info->fs_mutex);
return err;
}
static int btrfs_prepare_write(struct file *file, struct page *page,
unsigned from, unsigned to)
{
- WARN_ON(1);
return nobh_prepare_write(page, from, to, btrfs_get_block);
}
static int btrfs_commit_write(struct file *file, struct page *page,
unsigned from, unsigned to)
{
- WARN_ON(1);
return nobh_commit_write(file, page, from, to);
}
static void btrfs_truncate(struct inode *inode)
{
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_root *root = BTRFS_I(inode)->root;
int ret;
struct btrfs_trans_handle *trans;
int err = 0;
int ret;
int this_write;
+ struct inode *inode = file->f_path.dentry->d_inode;
for (i = 0; i < num_pages; i++) {
offset = pos & (PAGE_CACHE_SIZE -1);
this_write = min(PAGE_CACHE_SIZE - offset, write_bytes);
+ /* FIXME, one block at a time */
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_csum_file_block(trans, root, inode->i_ino,
+ pages[i]->index << PAGE_CACHE_SHIFT,
+ kmap(pages[i]), PAGE_CACHE_SIZE);
+ kunmap(pages[i]);
+ SetPageChecked(pages[i]);
+ ret = btrfs_end_transaction(trans, root);
+ BUG_ON(ret);
+ mutex_unlock(&root->fs_info->fs_mutex);
+
ret = nobh_commit_write(file, pages[i], offset,
offset + this_write);
pos += this_write;
this_write = min(PAGE_CACHE_SIZE - offset, write_bytes);
ret = nobh_prepare_write(pages[i], offset,
offset + this_write,
- btrfs_get_block_lock);
+ btrfs_get_block);
pos += this_write;
if (ret) {
err = ret;
size_t num_written = 0;
int err = 0;
int ret = 0;
- struct btrfs_trans_handle *trans;
struct inode *inode = file->f_path.dentry->d_inode;
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_root *root = BTRFS_I(inode)->root;
struct page *pages[1];
if (file->f_flags & O_DIRECT)
size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset);
size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >>
PAGE_CACHE_SHIFT;
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
-
- ret = prepare_pages(trans, root, file, pages, num_pages,
+ ret = prepare_pages(NULL, root, file, pages, num_pages,
pos, write_bytes);
BUG_ON(ret);
ret = btrfs_copy_from_user(pos, num_pages,
write_bytes, pages, buf);
BUG_ON(ret);
- mutex_unlock(&root->fs_info->fs_mutex);
-
- ret = dirty_and_release_pages(trans, root, file, pages,
+ ret = dirty_and_release_pages(NULL, root, file, pages,
num_pages, pos, write_bytes);
BUG_ON(ret);
btrfs_drop_pages(pages, num_pages);
- ret = btrfs_end_transaction(trans, root);
+ buf += write_bytes;
+ count -= write_bytes;
+ pos += write_bytes;
+ num_written += write_bytes;
+
+ balance_dirty_pages_ratelimited(inode->i_mapping);
+ cond_resched();
+ }
+ mutex_unlock(&inode->i_mutex);
+out:
+ *ppos = pos;
+ current->backing_dev_info = NULL;
+ return num_written ? num_written : err;
+}
+
+#if 0
+static ssize_t inline_one_page(struct btrfs_root *root, struct inode *inode,
+ struct page *page, loff_t pos,
+ size_t offset, size_t write_bytes)
+{
+ struct btrfs_path *path;
+ struct btrfs_trans_handle *trans;
+ struct btrfs_key key;
+ struct btrfs_leaf *leaf;
+ struct btrfs_key found_key;
+ int ret;
+ size_t copy_size = 0;
+ char *dst = NULL;
+ int err = 0;
+ size_t num_written = 0;
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ key.objectid = inode->i_ino;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_INLINE_DATA_KEY);
+
+again:
+ key.offset = pos;
+ ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
+ if (ret < 0) {
+ err = ret;
+ goto out;
+ }
+ if (ret == 0) {
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
+ btrfs_disk_key_to_cpu(&found_key,
+ &leaf->items[path->slots[0]].key);
+ copy_size = btrfs_item_size(leaf->items + path->slots[0]);
+ dst = btrfs_item_ptr(leaf, path->slots[0], char);
+ copy_size = min(write_bytes, copy_size);
+ goto copyit;
+ } else {
+ int slot = path->slots[0];
+ if (slot > 0) {
+ slot--;
+ }
+ // FIXME find max key
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
+ btrfs_disk_key_to_cpu(&found_key,
+ &leaf->items[slot].key);
+ if (found_key.objectid != inode->i_ino)
+ goto insert;
+ if (btrfs_key_type(&found_key) != BTRFS_INLINE_DATA_KEY)
+ goto insert;
+ copy_size = btrfs_item_size(leaf->items + slot);
+ if (found_key.offset + copy_size <= pos)
+ goto insert;
+ dst = btrfs_item_ptr(leaf, path->slots[0], char);
+ dst += pos - found_key.offset;
+ copy_size = copy_size - (pos - found_key.offset);
+ BUG_ON(copy_size < 0);
+ copy_size = min(write_bytes, copy_size);
+ WARN_ON(copy_size == 0);
+ goto copyit;
+ }
+insert:
+ btrfs_release_path(root, path);
+ copy_size = min(write_bytes,
+ (size_t)BTRFS_LEAF_DATA_SIZE(root) -
+ sizeof(struct btrfs_item) * 4);
+ ret = btrfs_insert_empty_item(trans, root, path, &key, copy_size);
+ BUG_ON(ret);
+ dst = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
+ path->slots[0], char);
+copyit:
+ WARN_ON(copy_size == 0);
+ WARN_ON(dst + copy_size >
+ btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
+ path->slots[0], char) +
+ btrfs_item_size(btrfs_buffer_leaf(path->nodes[0])->items +
+ path->slots[0]));
+ btrfs_memcpy(root, path->nodes[0]->b_data, dst,
+ page_address(page) + offset, copy_size);
+ mark_buffer_dirty(path->nodes[0]);
+ btrfs_release_path(root, path);
+ pos += copy_size;
+ offset += copy_size;
+ num_written += copy_size;
+ write_bytes -= copy_size;
+ if (write_bytes)
+ goto again;
+out:
+ btrfs_free_path(path);
+ ret = btrfs_end_transaction(trans, root);
+ BUG_ON(ret);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return num_written ? num_written : err;
+}
+static ssize_t btrfs_file_inline_write(struct file *file,
+ const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ loff_t pos;
+ size_t num_written = 0;
+ int err = 0;
+ int ret = 0;
+ struct inode *inode = file->f_path.dentry->d_inode;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ unsigned long page_index;
+
+ if (file->f_flags & O_DIRECT)
+ return -EINVAL;
+ pos = *ppos;
+
+ vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
+ current->backing_dev_info = inode->i_mapping->backing_dev_info;
+ err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
+ if (err)
+ goto out;
+ if (count == 0)
+ goto out;
+ err = remove_suid(file->f_path.dentry);
+ if (err)
+ goto out;
+ file_update_time(file);
+ mutex_lock(&inode->i_mutex);
+ while(count > 0) {
+ size_t offset = pos & (PAGE_CACHE_SIZE - 1);
+ size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset);
+ struct page *page;
+
+ page_index = pos >> PAGE_CACHE_SHIFT;
+ page = grab_cache_page(inode->i_mapping, page_index);
+ if (!PageUptodate(page)) {
+ ret = mpage_readpage(page, btrfs_get_block);
+ BUG_ON(ret);
+ lock_page(page);
+ }
+ ret = btrfs_copy_from_user(pos, 1,
+ write_bytes, &page, buf);
+ BUG_ON(ret);
+ write_bytes = inline_one_page(root, inode, page, pos,
+ offset, write_bytes);
+ SetPageUptodate(page);
+ if (write_bytes > 0 && pos + write_bytes > inode->i_size) {
+ i_size_write(inode, pos + write_bytes);
+ mark_inode_dirty(inode);
+ }
+ page_cache_release(page);
+ unlock_page(page);
+ if (write_bytes < 0)
+ goto out_unlock;
buf += write_bytes;
count -= write_bytes;
pos += write_bytes;
balance_dirty_pages_ratelimited(inode->i_mapping);
cond_resched();
}
+out_unlock:
mutex_unlock(&inode->i_mutex);
out:
*ppos = pos;
current->backing_dev_info = NULL;
return num_written ? num_written : err;
}
+#endif
+
+static int btrfs_read_actor(read_descriptor_t *desc, struct page *page,
+ unsigned long offset, unsigned long size)
+{
+ char *kaddr;
+ unsigned long left, count = desc->count;
+ struct inode *inode = page->mapping->host;
+
+ if (size > count)
+ size = count;
+
+ if (!PageChecked(page)) {
+ /* FIXME, do it per block */
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ int ret = btrfs_csum_verify_file_block(root,
+ page->mapping->host->i_ino,
+ page->index << PAGE_CACHE_SHIFT,
+ kmap(page), PAGE_CACHE_SIZE);
+ if (ret) {
+ printk("failed to verify ino %lu page %lu\n",
+ page->mapping->host->i_ino,
+ page->index);
+ memset(page_address(page), 0, PAGE_CACHE_SIZE);
+ }
+ SetPageChecked(page);
+ kunmap(page);
+ }
+ /*
+ * Faults on the destination of a read are common, so do it before
+ * taking the kmap.
+ */
+ if (!fault_in_pages_writeable(desc->arg.buf, size)) {
+ kaddr = kmap_atomic(page, KM_USER0);
+ left = __copy_to_user_inatomic(desc->arg.buf,
+ kaddr + offset, size);
+ kunmap_atomic(kaddr, KM_USER0);
+ if (left == 0)
+ goto success;
+ }
+
+ /* Do it the slow way */
+ kaddr = kmap(page);
+ left = __copy_to_user(desc->arg.buf, kaddr + offset, size);
+ kunmap(page);
+
+ if (left) {
+ size -= left;
+ desc->error = -EFAULT;
+ }
+success:
+ desc->count = count - size;
+ desc->written += size;
+ desc->arg.buf += size;
+ return size;
+}
+
+/**
+ * btrfs_file_aio_read - filesystem read routine
+ * @iocb: kernel I/O control block
+ * @iov: io vector request
+ * @nr_segs: number of segments in the iovec
+ * @pos: current file position
+ */
+static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos)
+{
+ struct file *filp = iocb->ki_filp;
+ ssize_t retval;
+ unsigned long seg;
+ size_t count;
+ loff_t *ppos = &iocb->ki_pos;
+
+ count = 0;
+ for (seg = 0; seg < nr_segs; seg++) {
+ const struct iovec *iv = &iov[seg];
+
+ /*
+ * If any segment has a negative length, or the cumulative
+ * length ever wraps negative then return -EINVAL.
+ */
+ count += iv->iov_len;
+ if (unlikely((ssize_t)(count|iv->iov_len) < 0))
+ return -EINVAL;
+ if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len))
+ continue;
+ if (seg == 0)
+ return -EFAULT;
+ nr_segs = seg;
+ count -= iv->iov_len; /* This segment is no good */
+ break;
+ }
+ retval = 0;
+ if (count) {
+ for (seg = 0; seg < nr_segs; seg++) {
+ read_descriptor_t desc;
+
+ desc.written = 0;
+ desc.arg.buf = iov[seg].iov_base;
+ desc.count = iov[seg].iov_len;
+ if (desc.count == 0)
+ continue;
+ desc.error = 0;
+ do_generic_file_read(filp, ppos, &desc,
+ btrfs_read_actor);
+ retval += desc.written;
+ if (desc.error) {
+ retval = retval ?: desc.error;
+ break;
+ }
+ }
+ }
+ return retval;
+}
+
+static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_key key;
+ struct btrfs_root_item new_root_item;
+ int ret;
+ u64 objectid;
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ BUG_ON(!trans);
+
+ ret = btrfs_update_inode(trans, root, root->inode);
+ BUG_ON(ret);
+
+ ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
+ 0, &objectid);
+ BUG_ON(ret);
+
+ memset(&new_root_item, 0, sizeof(new_root_item));
+ memcpy(&new_root_item, &root->root_item,
+ sizeof(new_root_item));
+
+ key.objectid = objectid;
+ key.offset = 1;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
+ btrfs_set_root_blocknr(&new_root_item, root->node->b_blocknr);
+
+ ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
+ &new_root_item);
+ BUG_ON(ret);
+
+printk("adding snapshot name %.*s root %Lu %Lu %u\n", namelen, name, key.objectid, key.offset, key.flags);
+
+ /*
+ * insert the directory item
+ */
+ key.offset = (u64)-1;
+ ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
+ name, namelen,
+ root->fs_info->sb->s_root->d_inode->i_ino,
+ &key, 0);
+
+ BUG_ON(ret);
+
+ ret = btrfs_inc_root_ref(trans, root);
+ BUG_ON(ret);
+
+ ret = btrfs_commit_transaction(trans, root);
+ BUG_ON(ret);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return 0;
+}
+
+static int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int
+ cmd, unsigned long arg)
+{
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct btrfs_ioctl_vol_args vol_args;
+ int ret;
+ int namelen;
+
+ if (!root->ref_cows)
+ return -EINVAL;
+ switch (cmd) {
+ case BTRFS_IOC_SNAP_CREATE:
+ if (copy_from_user(&vol_args,
+ (struct btrfs_ioctl_vol_args __user *)arg,
+ sizeof(vol_args)))
+ return -EFAULT;
+ namelen = strlen(vol_args.name);
+ if (namelen > BTRFS_VOL_NAME_MAX)
+ return -EINVAL;
+ ret = create_snapshot(root, vol_args.name, namelen);
+ WARN_ON(ret);
+ break;
+ default:
+ return -ENOTTY;
+ }
+ return 0;
+}
+
+static struct kmem_cache *btrfs_inode_cachep;
+struct kmem_cache *btrfs_trans_handle_cachep;
+struct kmem_cache *btrfs_transaction_cachep;
+struct kmem_cache *btrfs_bit_radix_cachep;
+struct kmem_cache *btrfs_path_cachep;
+
+/*
+ * Called inside transaction, so use GFP_NOFS
+ */
+static struct inode *btrfs_alloc_inode(struct super_block *sb)
+{
+ struct btrfs_inode *ei;
+
+ ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
+ if (!ei)
+ return NULL;
+ return &ei->vfs_inode;
+}
+
+static void btrfs_destroy_inode(struct inode *inode)
+{
+ WARN_ON(!list_empty(&inode->i_dentry));
+ WARN_ON(inode->i_data.nrpages);
+
+ kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
+}
+
+static void init_once(void * foo, struct kmem_cache * cachep,
+ unsigned long flags)
+{
+ struct btrfs_inode *ei = (struct btrfs_inode *) foo;
+
+ if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+ SLAB_CTOR_CONSTRUCTOR) {
+ inode_init_once(&ei->vfs_inode);
+ }
+}
+
+static int init_inodecache(void)
+{
+ btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache",
+ sizeof(struct btrfs_inode),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ init_once, NULL);
+ btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache",
+ sizeof(struct btrfs_trans_handle),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ NULL, NULL);
+ btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache",
+ sizeof(struct btrfs_transaction),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ NULL, NULL);
+ btrfs_path_cachep = kmem_cache_create("btrfs_path_cache",
+ sizeof(struct btrfs_transaction),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ NULL, NULL);
+ btrfs_bit_radix_cachep = kmem_cache_create("btrfs_radix",
+ 256,
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD |
+ SLAB_DESTROY_BY_RCU),
+ NULL, NULL);
+ if (btrfs_inode_cachep == NULL || btrfs_trans_handle_cachep == NULL ||
+ btrfs_transaction_cachep == NULL || btrfs_bit_radix_cachep == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+static void destroy_inodecache(void)
+{
+ kmem_cache_destroy(btrfs_inode_cachep);
+ kmem_cache_destroy(btrfs_trans_handle_cachep);
+ kmem_cache_destroy(btrfs_transaction_cachep);
+ kmem_cache_destroy(btrfs_bit_radix_cachep);
+ kmem_cache_destroy(btrfs_path_cachep);
+}
static int btrfs_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
.write_super = btrfs_write_super,
.sync_fs = btrfs_sync_fs,
.write_inode = btrfs_write_inode,
+ .alloc_inode = btrfs_alloc_inode,
+ .destroy_inode = btrfs_destroy_inode,
};
static struct inode_operations btrfs_dir_inode_operations = {
.rmdir = btrfs_rmdir,
};
+static struct inode_operations btrfs_dir_ro_inode_operations = {
+ .lookup = btrfs_lookup,
+};
+
static struct file_operations btrfs_dir_file_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
.readdir = btrfs_readdir,
+ .ioctl = btrfs_ioctl,
};
static struct address_space_operations btrfs_aops = {
static struct file_operations btrfs_file_operations = {
.llseek = generic_file_llseek,
.read = do_sync_read,
- .aio_read = generic_file_aio_read,
+ .aio_read = btrfs_file_aio_read,
.write = btrfs_file_write,
.mmap = generic_file_mmap,
.open = generic_file_open,
+ .ioctl = btrfs_ioctl,
};
static int __init init_btrfs_fs(void)
{
+ int err;
printk("btrfs loaded!\n");
+ err = init_inodecache();
+ if (err)
+ return err;
+ kset_set_kset_s(&btrfs_subsys, fs_subsys);
+ err = subsystem_register(&btrfs_subsys);
+ if (err)
+ goto out;
return register_filesystem(&btrfs_fs_type);
+out:
+ destroy_inodecache();
+ return err;
}
static void __exit exit_btrfs_fs(void)
{
+ destroy_inodecache();
unregister_filesystem(&btrfs_fs_type);
+ subsystem_unregister(&btrfs_subsys);
printk("btrfs unloaded\n");
}
projects / deliverable / linux.git / blobdiff