#include <linux/mpage.h>
#include <linux/swap.h>
#include <linux/writeback.h>
+#include <linux/statfs.h>
#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 struct address_space_operations btrfs_aops;
static struct file_operations btrfs_file_operations;
-static int check_inode(struct inode *inode)
-{
- struct btrfs_inode *ei = BTRFS_I(inode);
- WARN_ON(ei->magic != 0xDEADBEEF);
- WARN_ON(ei->magic2 != 0xDEADBEAF);
- return 0;
-}
-
static void btrfs_read_locked_inode(struct inode *inode)
{
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;
path = btrfs_alloc_path();
btrfs_init_path(path);
mutex_lock(&root->fs_info->fs_mutex);
- check_inode(inode);
- 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);
btrfs_free_path(path);
- mutex_unlock(&root->fs_info->fs_mutex);
- make_bad_inode(inode);
- return;
+ goto make_bad;
}
- check_inode(inode);
inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
path->slots[0],
struct btrfs_inode_item);
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);
- check_inode(inode);
+
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;
}
- check_inode(inode);
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 btrfs_path *path;
const char *name = dentry->d_name.name;
int name_len = dentry->d_name.len;
- int ret;
+ int ret = 0;
u64 objectid;
struct btrfs_dir_item *di;
path = btrfs_alloc_path();
BUG_ON(!path);
btrfs_init_path(path);
- ret = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
+ di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
name, name_len, -1);
- if (ret < 0)
+ if (IS_ERR(di)) {
+ ret = PTR_ERR(di);
goto err;
- if (ret > 0) {
+ }
+ if (!di) {
ret = -ENOENT;
goto err;
}
- 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_delete_one_dir_name(trans, root, path, di);
+ BUG_ON(ret);
+ btrfs_release_path(root, path);
- ret = btrfs_del_item(trans, root, path);
+ di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
+ objectid, name, name_len, -1);
+ if (IS_ERR(di)) {
+ ret = PTR_ERR(di);
+ goto err;
+ }
+ if (!di) {
+ ret = -ENOENT;
+ goto err;
+ }
+ ret = btrfs_delete_one_dir_name(trans, root, path, di);
BUG_ON(ret);
+
dentry->d_inode->i_ctime = dir->i_ctime;
err:
- btrfs_release_path(root, path);
btrfs_free_path(path);
- if (ret == 0)
+ 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_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 = "..";
path = btrfs_alloc_path();
BUG_ON(!path);
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);
}
+ ret = 0;
btrfs_release_path(root, path);
/* now the directory is empty */
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;
int ret;
clear_inode(inode);
path = btrfs_alloc_path();
BUG_ON(!path);
btrfs_init_path(path);
- ret = btrfs_lookup_inode_map(trans, root, path, objectid, -1);
- if (ret) {
- if (ret > 0)
- ret = -ENOENT;
- 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);
-
- ret = btrfs_lookup_inode(trans, root, path, objectid, -1);
+ ret = btrfs_lookup_inode(trans, root, path,
+ &BTRFS_I(inode)->location, -1);
BUG_ON(ret);
ret = btrfs_del_item(trans, root, path);
BUG_ON(ret);
-error:
- btrfs_release_path(root, path);
btrfs_free_path(path);
return ret;
}
key.objectid = inode->i_ino;
key.offset = (u64)-1;
key.flags = 0;
+ /*
+ * 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);
if (btrfs_disk_key_objectid(found_key) != inode->i_ino)
break;
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;
+ found_extent = 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;
+ if (btrfs_file_extent_type(fi) !=
+ BTRFS_FILE_EXTENT_INLINE) {
+ extent_start =
+ btrfs_file_extent_disk_blocknr(fi);
+ extent_num_blocks =
+ btrfs_file_extent_disk_num_blocks(fi);
+ /* FIXME blocksize != 4096 */
+ inode->i_blocks -=
+ btrfs_file_extent_num_blocks(fi) << 3;
+ found_extent = 1;
+ }
}
ret = btrfs_del_item(trans, root, path);
BUG_ON(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_root *root = BTRFS_I(dir)->root;
int ret;
path = btrfs_alloc_path();
BUG_ON(!path);
btrfs_init_path(path);
- ret = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
+ di = 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 (!di || IS_ERR(di)) {
+ location->objectid = 0;
ret = 0;
goto out;
}
- 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_free_path(path);
- check_inode(dir);
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;
- struct btrfs_root *root = btrfs_sb(dir->i_sb);
- 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);
mutex_lock(&root->fs_info->fs_mutex);
- ret = btrfs_inode_by_name(dir, dentry, &ino);
+ 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);
- check_inode(inode);
+ if (inode->i_state & I_NEW) {
+ if (sub_root != 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);
+ }
}
- check_inode(dir);
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;
int advance;
unsigned char d_type = DT_UNKNOWN;
int over = 0;
-
+ u32 di_cur;
+ u32 di_total;
+ u32 di_len;
+ 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;
path = btrfs_alloc_path();
btrfs_init_path(path);
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
- if (ret < 0) {
+ if (ret < 0)
goto err;
- }
advance = 0;
while(1) {
leaf = btrfs_buffer_leaf(path->nodes[0]);
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)
- continue;
+ if (btrfs_disk_key_type(&item->key) != key_type)
+ break;
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;
+ di_cur = 0;
+ di_total = btrfs_item_size(leaf->items + slot);
+ while(di_cur < di_total) {
+ over = filldir(dirent, (const char *)(di + 1),
+ btrfs_dir_name_len(di),
+ btrfs_disk_key_offset(&item->key),
+ btrfs_disk_key_objectid(&di->location),
+ d_type);
+ if (over)
+ goto nopos;
+ di_len = btrfs_dir_name_len(di) + sizeof(*di);
+ di_cur += di_len;
+ di = (struct btrfs_dir_item *)((char *)di + di_len);
}
- filp->f_pos = btrfs_disk_key_offset(&item->key) + 1;
}
+ filp->f_pos++;
+nopos:
ret = 0;
err:
btrfs_release_path(root, path);
struct inode * inode;
struct dentry * root_dentry;
struct btrfs_super_block *disk_super;
- struct btrfs_root *root;
+ struct btrfs_root *tree_root;
+ struct btrfs_inode *bi;
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_magic = BTRFS_SUPER_MAGIC;
sb->s_op = &btrfs_super_ops;
sb->s_time_gran = 1;
- root = open_ctree(sb);
+ 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) {
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);
- check_inode(inode);
}
static int btrfs_update_inode(struct btrfs_trans_handle *trans,
path = btrfs_alloc_path();
BUG_ON(!path);
btrfs_init_path(path);
-
- ret = btrfs_lookup_inode(trans, root, path, inode->i_ino, 1);
+ ret = btrfs_lookup_inode(trans, root, path,
+ &BTRFS_I(inode)->location, 1);
if (ret) {
if (ret > 0)
ret = -ENOENT;
fill_inode_item(inode_item, inode);
btrfs_mark_buffer_dirty(path->nodes[0]);
+ ret = 0;
failed:
btrfs_release_path(root, path);
btrfs_free_path(path);
- check_inode(inode);
- return 0;
+ 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 = 0;
+
+ if (wait) {
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ ret = btrfs_commit_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ }
+ return ret;
+}
+
+static void btrfs_dirty_inode(struct inode *inode)
+{
+ struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans;
- int ret;
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
- ret = btrfs_update_inode(trans, root, inode);
- if (wait)
- btrfs_commit_transaction(trans, root);
- else
- btrfs_end_transaction(trans, root);
+ btrfs_update_inode(trans, root, inode);
+ btrfs_end_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
- check_inode(inode);
- return ret;
}
static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
- struct inode *dir, int mode)
+ struct btrfs_root *root,
+ u64 objectid, int mode)
{
struct inode *inode;
struct btrfs_inode_item inode_item;
- struct btrfs_root *root = btrfs_sb(dir->i_sb);
- struct btrfs_key key;
+ struct btrfs_key *location;
int ret;
- u64 objectid;
- inode = new_inode(dir->i_sb);
+ inode = new_inode(root->fs_info->sb);
if (!inode)
return ERR_PTR(-ENOMEM);
- check_inode(inode);
- ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
- BUG_ON(ret);
+ BTRFS_I(inode)->root = root;
inode->i_uid = current->fsuid;
inode->i_gid = current->fsgid;
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);
insert_inode_hash(inode);
- check_inode(inode);
- check_inode(dir);
return inode;
}
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);
}
- check_inode(inode);
- check_inode(dentry->d_parent->d_inode);
return ret;
}
}
if (err > 0)
err = -EEXIST;
- check_inode(inode);
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;
+ u64 objectid;
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
- inode = btrfs_new_inode(trans, dir, mode);
+
+ 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, mode);
err = PTR_ERR(inode);
if (IS_ERR(inode))
goto out_unlock;
out_unlock:
btrfs_end_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
- check_inode(inode);
- check_inode(dir);
if (drop_inode) {
inode_dec_link_count(inode);
}
static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans,
- struct inode *inode, struct inode *dir)
+ struct btrfs_root *root,
+ u64 objectid, u64 dirid)
{
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
int ret;
char buf[2];
+ struct btrfs_key key;
+
buf[0] = '.';
buf[1] = '.';
- ret = btrfs_insert_dir_item(trans, root, buf, 1, inode->i_ino,
- inode->i_ino, 1);
+ key.objectid = objectid;
+ key.offset = 0;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
+
+ ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid,
+ &key, 1);
if (ret)
goto error;
- ret = btrfs_insert_dir_item(trans, root, buf, 2, inode->i_ino,
- dir->i_ino, 1);
+ key.objectid = dirid;
+ ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid,
+ &key, 1);
if (ret)
goto error;
- inode->i_size = 3;
- 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;
+ u64 objectid;
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
err = PTR_ERR(trans);
goto out_unlock;
}
- inode = btrfs_new_inode(trans, dir, S_IFDIR | mode);
+
+ 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, S_IFDIR | mode);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
goto out_fail;
inode->i_op = &btrfs_dir_inode_operations;
inode->i_fop = &btrfs_dir_file_operations;
- err = btrfs_make_empty_dir(trans, inode, dir);
+ err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino);
+ if (err)
+ goto out_fail;
+
+ inode->i_size = 6;
+ err = btrfs_update_inode(trans, root, inode);
if (err)
goto out_fail;
err = btrfs_add_link(trans, dentry, inode);
return err;
}
+static int btrfs_sync_file(struct file *file,
+ struct dentry *dentry, int datasync)
+{
+ struct inode *inode = dentry->d_inode;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ int ret;
+ struct btrfs_trans_handle *trans;
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ if (!trans) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ ret = btrfs_commit_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+out:
+ return ret > 0 ? EIO : ret;
+}
+
static int btrfs_sync_fs(struct super_block *sb, int wait)
{
struct btrfs_trans_handle *trans;
return 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;
-}
-
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;
+ u32 found_type;
struct btrfs_path *path;
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
- struct btrfs_trans_handle *trans = NULL;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_file_extent_item *item;
struct btrfs_leaf *leaf;
struct btrfs_disk_key *found_key;
path = btrfs_alloc_path();
BUG_ON(!path);
btrfs_init_path(path);
- if (create)
- trans = btrfs_start_transaction(root, 1);
-
+ if (create) {
+ WARN_ON(1);
+ }
- ret = btrfs_lookup_file_extent(trans, root, path,
+ ret = btrfs_lookup_file_extent(NULL, root, path,
inode->i_ino,
iblock << inode->i_blkbits, 0);
if (ret < 0) {
if (ret != 0) {
if (path->slots[0] == 0) {
btrfs_release_path(root, path);
- goto allocate;
+ goto out;
}
path->slots[0]--;
}
blocknr = btrfs_file_extent_disk_blocknr(item);
blocknr += btrfs_file_extent_offset(item);
- /* exact match found, use it */
- if (ret == 0) {
- err = 0;
- map_bh(result, inode->i_sb, blocknr);
- goto out;
- }
-
/* are we inside the extent that was found? */
found_key = &leaf->items[path->slots[0]].key;
+ found_type = btrfs_disk_key_type(found_key);
if (btrfs_disk_key_objectid(found_key) != objectid ||
- btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) {
+ found_type != BTRFS_EXTENT_DATA_KEY) {
extent_end = 0;
extent_start = 0;
btrfs_release_path(root, path);
- goto allocate;
- }
-
- 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);
- if (iblock >= extent_start && iblock < extent_end) {
- err = 0;
- map_bh(result, inode->i_sb, blocknr + iblock - extent_start);
goto out;
}
-allocate:
- /* ok, create a new extent */
- if (!create) {
- err = 0;
- goto out;
- }
- ret = btrfs_alloc_file_extent(trans, root, objectid,
- iblock << inode->i_blkbits,
- 1, extent_end, &blocknr);
- if (ret) {
- err = ret;
- goto out;
+ found_type = btrfs_file_extent_type(item);
+ extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key);
+ if (found_type == BTRFS_FILE_EXTENT_REG) {
+ extent_start = extent_start >> inode->i_blkbits;
+ extent_end = extent_start + btrfs_file_extent_num_blocks(item);
+ if (iblock >= extent_start && iblock < extent_end) {
+ err = 0;
+ btrfs_map_bh_to_logical(root, result, blocknr +
+ iblock - extent_start);
+ goto out;
+ }
+ } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
+ char *ptr;
+ char *map;
+ u32 size;
+ size = btrfs_file_extent_inline_len(leaf->items +
+ path->slots[0]);
+ extent_end = (extent_start + size) >> inode->i_blkbits;
+ extent_start >>= inode->i_blkbits;
+ if (iblock < extent_start || iblock > extent_end) {
+ goto out;
+ }
+ ptr = btrfs_file_extent_inline_start(item);
+ map = kmap(result->b_page);
+ memcpy(map, ptr, size);
+ memset(map + size, 0, PAGE_CACHE_SIZE - size);
+ flush_dcache_page(result->b_page);
+ kunmap(result->b_page);
+ set_buffer_uptodate(result);
+ SetPageChecked(result->b_page);
+ btrfs_map_bh_to_logical(root, result, 0);
}
- inode->i_blocks += inode->i_sb->s_blocksize >> 9;
- set_buffer_new(result);
- 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);
+ err = btrfs_get_block_lock(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_write_super(struct super_block *sb)
{
return mpage_readpage(page, btrfs_get_block);
}
-static int btrfs_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+/*
+ * While block_write_full_page is writing back the dirty buffers under
+ * the page lock, whoever dirtied the buffers may decide to clean them
+ * again at any time. We handle that by only looking at the buffer
+ * state inside lock_buffer().
+ *
+ * If block_write_full_page() is called for regular writeback
+ * (wbc->sync_mode == WB_SYNC_NONE) then it will redirty a page which has a
+ * locked buffer. This only can happen if someone has written the buffer
+ * directly, with submit_bh(). At the address_space level PageWriteback
+ * prevents this contention from occurring.
+ */
+static int __btrfs_write_full_page(struct inode *inode, struct page *page,
+ struct writeback_control *wbc)
{
- return mpage_readpages(mapping, pages, nr_pages, btrfs_get_block);
+ int err;
+ sector_t block;
+ sector_t last_block;
+ struct buffer_head *bh, *head;
+ const unsigned blocksize = 1 << inode->i_blkbits;
+ int nr_underway = 0;
+
+ BUG_ON(!PageLocked(page));
+
+ last_block = (i_size_read(inode) - 1) >> inode->i_blkbits;
+
+ if (!page_has_buffers(page)) {
+ create_empty_buffers(page, blocksize,
+ (1 << BH_Dirty)|(1 << BH_Uptodate));
+ }
+
+ /*
+ * Be very careful. We have no exclusion from __set_page_dirty_buffers
+ * here, and the (potentially unmapped) buffers may become dirty at
+ * any time. If a buffer becomes dirty here after we've inspected it
+ * then we just miss that fact, and the page stays dirty.
+ *
+ * Buffers outside i_size may be dirtied by __set_page_dirty_buffers;
+ * handle that here by just cleaning them.
+ */
+
+ block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
+ head = page_buffers(page);
+ bh = head;
+
+ /*
+ * Get all the dirty buffers mapped to disk addresses and
+ * handle any aliases from the underlying blockdev's mapping.
+ */
+ do {
+ if (block > last_block) {
+ /*
+ * mapped buffers outside i_size will occur, because
+ * this page can be outside i_size when there is a
+ * truncate in progress.
+ */
+ /*
+ * The buffer was zeroed by block_write_full_page()
+ */
+ clear_buffer_dirty(bh);
+ set_buffer_uptodate(bh);
+ } else if (!buffer_mapped(bh) && buffer_dirty(bh)) {
+ WARN_ON(bh->b_size != blocksize);
+ err = btrfs_get_block(inode, block, bh, 0);
+ if (err)
+ goto recover;
+ if (buffer_new(bh)) {
+ /* blockdev mappings never come here */
+ clear_buffer_new(bh);
+ unmap_underlying_metadata(bh->b_bdev,
+ bh->b_blocknr);
+ }
+ }
+ bh = bh->b_this_page;
+ block++;
+ } while (bh != head);
+
+ do {
+ if (!buffer_mapped(bh))
+ continue;
+ /*
+ * If it's a fully non-blocking write attempt and we cannot
+ * lock the buffer then redirty the page. Note that this can
+ * potentially cause a busy-wait loop from pdflush and kswapd
+ * activity, but those code paths have their own higher-level
+ * throttling.
+ */
+ if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) {
+ lock_buffer(bh);
+ } else if (test_set_buffer_locked(bh)) {
+ redirty_page_for_writepage(wbc, page);
+ continue;
+ }
+ if (test_clear_buffer_dirty(bh) && bh->b_blocknr != 0) {
+ mark_buffer_async_write(bh);
+ } else {
+ unlock_buffer(bh);
+ }
+ } while ((bh = bh->b_this_page) != head);
+
+ /*
+ * The page and its buffers are protected by PageWriteback(), so we can
+ * drop the bh refcounts early.
+ */
+ BUG_ON(PageWriteback(page));
+ set_page_writeback(page);
+
+ do {
+ struct buffer_head *next = bh->b_this_page;
+ if (buffer_async_write(bh)) {
+ submit_bh(WRITE, bh);
+ nr_underway++;
+ }
+ bh = next;
+ } while (bh != head);
+ unlock_page(page);
+
+ err = 0;
+done:
+ if (nr_underway == 0) {
+ /*
+ * The page was marked dirty, but the buffers were
+ * clean. Someone wrote them back by hand with
+ * ll_rw_block/submit_bh. A rare case.
+ */
+ int uptodate = 1;
+ do {
+ if (!buffer_uptodate(bh)) {
+ uptodate = 0;
+ break;
+ }
+ bh = bh->b_this_page;
+ } while (bh != head);
+ if (uptodate)
+ SetPageUptodate(page);
+ end_page_writeback(page);
+ /*
+ * The page and buffer_heads can be released at any time from
+ * here on.
+ */
+ wbc->pages_skipped++; /* We didn't write this page */
+ }
+ return err;
+
+recover:
+ /*
+ * ENOSPC, or some other error. We may already have added some
+ * blocks to the file, so we need to write these out to avoid
+ * exposing stale data.
+ * The page is currently locked and not marked for writeback
+ */
+ bh = head;
+ /* Recovery: lock and submit the mapped buffers */
+ do {
+ if (buffer_mapped(bh) && buffer_dirty(bh)) {
+ lock_buffer(bh);
+ mark_buffer_async_write(bh);
+ } else {
+ /*
+ * The buffer may have been set dirty during
+ * attachment to a dirty page.
+ */
+ clear_buffer_dirty(bh);
+ }
+ } while ((bh = bh->b_this_page) != head);
+ SetPageError(page);
+ BUG_ON(PageWriteback(page));
+ set_page_writeback(page);
+ do {
+ struct buffer_head *next = bh->b_this_page;
+ if (buffer_async_write(bh)) {
+ clear_buffer_dirty(bh);
+ submit_bh(WRITE, bh);
+ nr_underway++;
+ }
+ bh = next;
+ } while (bh != head);
+ unlock_page(page);
+ goto done;
}
+/*
+ * The generic ->writepage function for buffer-backed address_spaces
+ */
static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
{
- return nobh_writepage(page, btrfs_get_block, wbc);
+ struct inode * const inode = page->mapping->host;
+ loff_t i_size = i_size_read(inode);
+ const pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
+ unsigned offset;
+ void *kaddr;
+
+ /* Is the page fully inside i_size? */
+ if (page->index < end_index)
+ return __btrfs_write_full_page(inode, page, wbc);
+
+ /* Is the page fully outside i_size? (truncate in progress) */
+ offset = i_size & (PAGE_CACHE_SIZE-1);
+ if (page->index >= end_index+1 || !offset) {
+ /*
+ * The page may have dirty, unmapped buffers. For example,
+ * they may have been added in ext3_writepage(). Make them
+ * freeable here, so the page does not leak.
+ */
+ block_invalidatepage(page, 0);
+ unlock_page(page);
+ return 0; /* don't care */
+ }
+
+ /*
+ * The page straddles i_size. It must be zeroed out on each and every
+ * writepage invokation because it may be mmapped. "A file is mapped
+ * in multiples of the page size. For a file that is not a multiple of
+ * the page size, the remaining memory is zeroed when mapped, and
+ * writes to that region are not written out to the file."
+ */
+ kaddr = kmap_atomic(page, KM_USER0);
+ memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
+ flush_dcache_page(page);
+ kunmap_atomic(kaddr, KM_USER0);
+ return __btrfs_write_full_page(inode, page, wbc);
}
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;
mark_inode_dirty(inode);
}
+/*
+ * Make sure any changes to nobh_commit_write() are reflected in
+ * nobh_truncate_page(), since it doesn't call commit_write().
+ */
+static int btrfs_commit_write(struct file *file, struct page *page,
+ unsigned from, unsigned to)
+{
+ struct inode *inode = page->mapping->host;
+ struct buffer_head *bh;
+ loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
+
+ SetPageUptodate(page);
+ bh = page_buffers(page);
+ if (buffer_mapped(bh) && bh->b_blocknr != 0) {
+ set_page_dirty(page);
+ }
+ if (pos > inode->i_size) {
+ i_size_write(inode, pos);
+ mark_inode_dirty(inode);
+ }
+ return 0;
+}
+
static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes,
struct page **prepared_pages,
const char __user * buf)
int ret;
int this_write;
struct inode *inode = file->f_path.dentry->d_inode;
+ struct buffer_head *bh;
+ struct btrfs_file_extent_item *ei;
for (i = 0; i < num_pages; i++) {
offset = pos & (PAGE_CACHE_SIZE -1);
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
- btrfs_csum_file_block(trans, root, inode->i_ino,
+
+ bh = page_buffers(pages[i]);
+ if (buffer_mapped(bh) && bh->b_blocknr == 0) {
+ struct btrfs_key key;
+ struct btrfs_path *path;
+ char *ptr;
+ u32 datasize;
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ key.objectid = inode->i_ino;
+ key.offset = pages[i]->index << PAGE_CACHE_SHIFT;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
+ BUG_ON(write_bytes >= PAGE_CACHE_SIZE);
+ datasize = offset +
+ btrfs_file_extent_calc_inline_size(write_bytes);
+ ret = btrfs_insert_empty_item(trans, root, path, &key,
+ datasize);
+ BUG_ON(ret);
+ ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
+ path->slots[0], struct btrfs_file_extent_item);
+ btrfs_set_file_extent_generation(ei, trans->transid);
+ btrfs_set_file_extent_type(ei,
+ BTRFS_FILE_EXTENT_INLINE);
+ ptr = btrfs_file_extent_inline_start(ei);
+ memcpy(ptr, bh->b_data, offset + write_bytes);
+ mark_buffer_dirty(path->nodes[0]);
+ btrfs_free_path(path);
+ } else {
+ btrfs_csum_file_block(trans, root, inode->i_ino,
pages[i]->index << PAGE_CACHE_SHIFT,
kmap(pages[i]), PAGE_CACHE_SIZE);
- kunmap(pages[i]);
+ 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,
+ ret = btrfs_commit_write(file, pages[i], offset,
offset + this_write);
pos += this_write;
if (ret) {
return err;
}
-static int prepare_pages(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
+static int drop_extents(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct inode *inode,
+ u64 start, u64 end)
+{
+ int ret;
+ struct btrfs_key key;
+ struct btrfs_leaf *leaf;
+ int slot;
+ struct btrfs_file_extent_item *extent;
+ u64 extent_end = 0;
+ int keep;
+ struct btrfs_file_extent_item old;
+ struct btrfs_path *path;
+ u64 search_start = start;
+ int bookend;
+ int found_type;
+ int found_extent;
+ int found_inline;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+ while(1) {
+ btrfs_release_path(root, path);
+ ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino,
+ search_start, -1);
+ if (ret < 0)
+ goto out;
+ if (ret > 0) {
+ if (path->slots[0] == 0) {
+ ret = 0;
+ goto out;
+ }
+ path->slots[0]--;
+ }
+ keep = 0;
+ bookend = 0;
+ found_extent = 0;
+ found_inline = 0;
+ extent = NULL;
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
+ slot = path->slots[0];
+ btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key);
+ if (key.offset >= end || key.objectid != inode->i_ino) {
+ ret = 0;
+ goto out;
+ }
+ if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) {
+ ret = 0;
+ goto out;
+ }
+ extent = btrfs_item_ptr(leaf, slot,
+ struct btrfs_file_extent_item);
+ found_type = btrfs_file_extent_type(extent);
+ if (found_type == BTRFS_FILE_EXTENT_REG) {
+ extent_end = key.offset +
+ (btrfs_file_extent_num_blocks(extent) <<
+ inode->i_blkbits);
+ found_extent = 1;
+ } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
+ found_inline = 1;
+ extent_end = key.offset +
+ btrfs_file_extent_inline_len(leaf->items + slot);
+ }
+
+ if (!found_extent && !found_inline) {
+ ret = 0;
+ goto out;
+ }
+
+ if (search_start >= extent_end) {
+ ret = 0;
+ goto out;
+ }
+
+ search_start = extent_end;
+
+ if (end < extent_end && end >= key.offset) {
+ if (found_extent) {
+ memcpy(&old, extent, sizeof(old));
+ ret = btrfs_inc_extent_ref(trans, root,
+ btrfs_file_extent_disk_blocknr(&old),
+ btrfs_file_extent_disk_num_blocks(&old));
+ BUG_ON(ret);
+ }
+ WARN_ON(found_inline);
+ bookend = 1;
+ }
+
+ if (start > key.offset) {
+ u64 new_num;
+ u64 old_num;
+ /* truncate existing extent */
+ keep = 1;
+ WARN_ON(start & (root->blocksize - 1));
+ if (found_extent) {
+ new_num = (start - key.offset) >>
+ inode->i_blkbits;
+ old_num = btrfs_file_extent_num_blocks(extent);
+ inode->i_blocks -= (old_num - new_num) << 3;
+ btrfs_set_file_extent_num_blocks(extent,
+ new_num);
+ mark_buffer_dirty(path->nodes[0]);
+ } else {
+ WARN_ON(1);
+ /*
+ ret = btrfs_truncate_item(trans, root, path,
+ start - key.offset);
+ BUG_ON(ret);
+ */
+ }
+ }
+ if (!keep) {
+ u64 disk_blocknr = 0;
+ u64 disk_num_blocks = 0;
+ u64 extent_num_blocks = 0;
+ if (found_extent) {
+ disk_blocknr =
+ btrfs_file_extent_disk_blocknr(extent);
+ disk_num_blocks =
+ btrfs_file_extent_disk_num_blocks(extent);
+ extent_num_blocks =
+ btrfs_file_extent_num_blocks(extent);
+ }
+ ret = btrfs_del_item(trans, root, path);
+ BUG_ON(ret);
+ btrfs_release_path(root, path);
+ if (found_extent) {
+ inode->i_blocks -=
+ btrfs_file_extent_num_blocks(extent) << 3;
+ ret = btrfs_free_extent(trans, root,
+ disk_blocknr,
+ disk_num_blocks, 0);
+ }
+
+ BUG_ON(ret);
+ if (!bookend && search_start >= end) {
+ ret = 0;
+ goto out;
+ }
+ if (!bookend)
+ continue;
+ }
+ if (bookend && found_extent) {
+ /* create bookend */
+ struct btrfs_key ins;
+ ins.objectid = inode->i_ino;
+ ins.offset = end;
+ ins.flags = 0;
+ btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY);
+
+ btrfs_release_path(root, path);
+ ret = btrfs_insert_empty_item(trans, root, path, &ins,
+ sizeof(*extent));
+ BUG_ON(ret);
+ extent = btrfs_item_ptr(
+ btrfs_buffer_leaf(path->nodes[0]),
+ path->slots[0],
+ struct btrfs_file_extent_item);
+ btrfs_set_file_extent_disk_blocknr(extent,
+ btrfs_file_extent_disk_blocknr(&old));
+ btrfs_set_file_extent_disk_num_blocks(extent,
+ btrfs_file_extent_disk_num_blocks(&old));
+
+ btrfs_set_file_extent_offset(extent,
+ btrfs_file_extent_offset(&old) +
+ ((end - key.offset) >> inode->i_blkbits));
+ WARN_ON(btrfs_file_extent_num_blocks(&old) <
+ (end - key.offset) >> inode->i_blkbits);
+ btrfs_set_file_extent_num_blocks(extent,
+ btrfs_file_extent_num_blocks(&old) -
+ ((end - key.offset) >> inode->i_blkbits));
+
+ btrfs_set_file_extent_type(extent,
+ BTRFS_FILE_EXTENT_REG);
+ btrfs_set_file_extent_generation(extent,
+ btrfs_file_extent_generation(&old));
+ btrfs_mark_buffer_dirty(path->nodes[0]);
+ inode->i_blocks +=
+ btrfs_file_extent_num_blocks(extent) << 3;
+ ret = 0;
+ goto out;
+ }
+ }
+out:
+ btrfs_free_path(path);
+ return ret;
+}
+
+static int prepare_pages(struct btrfs_root *root,
struct file *file,
struct page **pages,
size_t num_pages,
loff_t pos,
- size_t write_bytes)
+ unsigned long first_index,
+ unsigned long last_index,
+ size_t write_bytes,
+ u64 alloc_extent_start)
{
int i;
unsigned long index = pos >> PAGE_CACHE_SHIFT;
struct inode *inode = file->f_path.dentry->d_inode;
int offset;
int err = 0;
- int ret;
int this_write;
+ struct buffer_head *bh;
+ struct buffer_head *head;
loff_t isize = i_size_read(inode);
memset(pages, 0, num_pages * sizeof(struct page *));
}
offset = pos & (PAGE_CACHE_SIZE -1);
this_write = min(PAGE_CACHE_SIZE - offset, write_bytes);
- ret = nobh_prepare_write(pages[i], offset,
- offset + this_write,
- btrfs_get_block);
+ create_empty_buffers(pages[i], root->fs_info->sb->s_blocksize,
+ (1 << BH_Uptodate));
+ head = page_buffers(pages[i]);
+ bh = head;
+ do {
+ err = btrfs_map_bh_to_logical(root, bh,
+ alloc_extent_start);
+ BUG_ON(err);
+ if (err)
+ goto failed_truncate;
+ bh = bh->b_this_page;
+ if (alloc_extent_start)
+ alloc_extent_start++;
+ } while (bh != head);
pos += this_write;
- if (ret) {
- err = ret;
- goto failed_truncate;
- }
WARN_ON(this_write > write_bytes);
write_bytes -= this_write;
}
int err = 0;
int ret = 0;
struct inode *inode = file->f_path.dentry->d_inode;
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
- struct page *pages[1];
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct page *pages[8];
+ struct page *pinned[2] = { NULL, NULL };
+ unsigned long first_index;
+ unsigned long last_index;
+ u64 start_pos;
+ u64 num_blocks;
+ u64 alloc_extent_start;
+ struct btrfs_trans_handle *trans;
+ struct btrfs_key ins;
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;
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);
- size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >>
- PAGE_CACHE_SHIFT;
- 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);
- ret = dirty_and_release_pages(NULL, root, file, pages,
- num_pages, pos, write_bytes);
- BUG_ON(ret);
- btrfs_drop_pages(pages, num_pages);
+ start_pos = pos & ~((u64)PAGE_CACHE_SIZE - 1);
+ num_blocks = (count + pos - start_pos + root->blocksize - 1) >>
+ inode->i_blkbits;
- buf += write_bytes;
- count -= write_bytes;
- pos += write_bytes;
- num_written += write_bytes;
-
- balance_dirty_pages_ratelimited(inode->i_mapping);
- cond_resched();
+ mutex_lock(&inode->i_mutex);
+ first_index = pos >> PAGE_CACHE_SHIFT;
+ last_index = (pos + count) >> PAGE_CACHE_SHIFT;
+
+ if ((first_index << PAGE_CACHE_SHIFT) < inode->i_size &&
+ (pos & (PAGE_CACHE_SIZE - 1))) {
+ pinned[0] = grab_cache_page(inode->i_mapping, first_index);
+ if (!PageUptodate(pinned[0])) {
+ ret = mpage_readpage(pinned[0], btrfs_get_block);
+ BUG_ON(ret);
+ } else {
+ unlock_page(pinned[0]);
+ }
+ }
+ if (first_index != last_index &&
+ (last_index << PAGE_CACHE_SHIFT) < inode->i_size &&
+ (count & (PAGE_CACHE_SIZE - 1))) {
+ pinned[1] = grab_cache_page(inode->i_mapping, last_index);
+ if (!PageUptodate(pinned[1])) {
+ ret = mpage_readpage(pinned[1], btrfs_get_block);
+ BUG_ON(ret);
+ } else {
+ unlock_page(pinned[1]);
+ }
}
- mutex_unlock(&inode->i_mutex);
-out:
- *ppos = pos;
- current->backing_dev_info = NULL;
- return num_written ? num_written : err;
-}
-
-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 (!trans) {
+ err = -ENOMEM;
+ mutex_unlock(&root->fs_info->fs_mutex);
+ goto out_unlock;
}
- 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;
+ /* FIXME blocksize != 4096 */
+ inode->i_blocks += num_blocks << 3;
+ if (start_pos < inode->i_size) {
+ /* FIXME blocksize != pagesize */
+ ret = drop_extents(trans, root, inode,
+ start_pos,
+ (pos + count + root->blocksize -1) &
+ ~((u64)root->blocksize - 1));
+ BUG_ON(ret);
+ }
+ if (inode->i_size >= PAGE_CACHE_SIZE || pos + count < inode->i_size ||
+ pos + count - start_pos > BTRFS_MAX_INLINE_DATA_SIZE(root)) {
+ ret = btrfs_alloc_extent(trans, root, inode->i_ino,
+ BTRFS_EXTENT_FILE, num_blocks, 1,
+ (u64)-1, &ins);
+ BUG_ON(ret);
+ ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
+ start_pos, ins.objectid, ins.offset);
+ BUG_ON(ret);
} 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;
+ ins.offset = 0;
+ ins.objectid = 0;
}
-insert:
- btrfs_release_path(root, path);
- copy_size = min(write_bytes, (size_t)512);
- 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);
+ alloc_extent_start = ins.objectid;
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_sb(inode->i_sb);
- 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;
+ size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >>
+ PAGE_CACHE_SHIFT;
- 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);
+ memset(pages, 0, sizeof(pages));
+ ret = prepare_pages(root, file, pages, num_pages,
+ pos, first_index, last_index,
+ write_bytes, alloc_extent_start);
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;
+
+ /* FIXME blocks != pagesize */
+ if (alloc_extent_start)
+ alloc_extent_start += num_pages;
+ ret = btrfs_copy_from_user(pos, num_pages,
+ write_bytes, pages, buf);
+ BUG_ON(ret);
+
+ ret = dirty_and_release_pages(NULL, root, file, pages,
+ num_pages, pos, write_bytes);
+ BUG_ON(ret);
+ btrfs_drop_pages(pages, num_pages);
+
buf += write_bytes;
count -= write_bytes;
pos += write_bytes;
out_unlock:
mutex_unlock(&inode->i_mutex);
out:
+ if (pinned[0])
+ page_cache_release(pinned[0]);
+ if (pinned[1])
+ page_cache_release(pinned[1]);
*ppos = pos;
current->backing_dev_info = NULL;
+ mark_inode_dirty(inode);
return num_written ? num_written : err;
}
{
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_sb(page->mapping->host->i_sb);
+ 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);
+ 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,
return retval;
}
+static int create_subvol(struct btrfs_root *root, char *name, int namelen)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_key key;
+ struct btrfs_root_item root_item;
+ struct btrfs_inode_item *inode_item;
+ struct buffer_head *subvol;
+ struct btrfs_leaf *leaf;
+ struct btrfs_root *new_root;
+ struct inode *inode;
+ int ret;
+ u64 objectid;
+ u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ BUG_ON(!trans);
+
+ subvol = btrfs_alloc_free_block(trans, root);
+ if (subvol == NULL)
+ return -ENOSPC;
+ leaf = btrfs_buffer_leaf(subvol);
+ btrfs_set_header_nritems(&leaf->header, 0);
+ btrfs_set_header_level(&leaf->header, 0);
+ btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol));
+ btrfs_set_header_generation(&leaf->header, trans->transid);
+ btrfs_set_header_owner(&leaf->header, root->root_key.objectid);
+ memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid,
+ sizeof(leaf->header.fsid));
+ mark_buffer_dirty(subvol);
+
+ inode_item = &root_item.inode;
+ memset(inode_item, 0, sizeof(*inode_item));
+ btrfs_set_inode_generation(inode_item, 1);
+ btrfs_set_inode_size(inode_item, 3);
+ btrfs_set_inode_nlink(inode_item, 1);
+ btrfs_set_inode_nblocks(inode_item, 1);
+ btrfs_set_inode_mode(inode_item, S_IFDIR | 0755);
+
+ btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol));
+ btrfs_set_root_refs(&root_item, 1);
+ brelse(subvol);
+ subvol = NULL;
+
+ ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
+ 0, &objectid);
+ BUG_ON(ret);
+
+ btrfs_set_root_dirid(&root_item, new_dirid);
+
+ key.objectid = objectid;
+ key.offset = 1;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
+ ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
+ &root_item);
+ BUG_ON(ret);
+
+ /*
+ * 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_commit_transaction(trans, root);
+ BUG_ON(ret);
+
+ new_root = btrfs_read_fs_root(root->fs_info, &key);
+ BUG_ON(!new_root);
+
+ trans = btrfs_start_transaction(new_root, 1);
+ BUG_ON(!trans);
+
+ inode = btrfs_new_inode(trans, new_root, new_dirid, S_IFDIR | 0700);
+ inode->i_op = &btrfs_dir_inode_operations;
+ inode->i_fop = &btrfs_dir_file_operations;
+
+ ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid);
+ BUG_ON(ret);
+
+ inode->i_nlink = 1;
+ inode->i_size = 6;
+ ret = btrfs_update_inode(trans, new_root, inode);
+ BUG_ON(ret);
+
+ ret = btrfs_commit_transaction(trans, new_root);
+ BUG_ON(ret);
+
+ iput(inode);
+
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return 0;
+}
+
+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;
+
+ if (!root->ref_cows)
+ return -EINVAL;
+
+ 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);
+
+ 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, bh_blocknr(root->node));
+
+ ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
+ &new_root_item);
+ BUG_ON(ret);
+
+ /*
+ * 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 add_disk(struct btrfs_root *root, char *name, int namelen)
+{
+ struct block_device *bdev;
+ struct btrfs_path *path;
+ struct super_block *sb = root->fs_info->sb;
+ struct btrfs_root *dev_root = root->fs_info->dev_root;
+ struct btrfs_trans_handle *trans;
+ struct btrfs_device_item *dev_item;
+ struct btrfs_key key;
+ u16 item_size;
+ u64 num_blocks;
+ u64 new_blocks;
+ u64 device_id;
+ int ret;
+
+printk("adding disk %s\n", name);
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+ num_blocks = btrfs_super_total_blocks(root->fs_info->disk_super);
+ bdev = open_bdev_excl(name, O_RDWR, sb);
+ if (IS_ERR(bdev)) {
+ ret = PTR_ERR(bdev);
+printk("open bdev excl failed ret %d\n", ret);
+ goto out_nolock;
+ }
+ set_blocksize(bdev, sb->s_blocksize);
+ new_blocks = bdev->bd_inode->i_size >> sb->s_blocksize_bits;
+ key.objectid = num_blocks;
+ key.offset = new_blocks;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_DEV_ITEM_KEY);
+
+ mutex_lock(&dev_root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(dev_root, 1);
+ item_size = sizeof(*dev_item) + namelen;
+printk("insert empty on %Lu %Lu %u size %d\n", num_blocks, new_blocks, key.flags, item_size);
+ ret = btrfs_insert_empty_item(trans, dev_root, path, &key, item_size);
+ if (ret) {
+printk("insert failed %d\n", ret);
+ close_bdev_excl(bdev);
+ if (ret > 0)
+ ret = -EEXIST;
+ goto out;
+ }
+ dev_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
+ path->slots[0], struct btrfs_device_item);
+ btrfs_set_device_pathlen(dev_item, namelen);
+ memcpy(dev_item + 1, name, namelen);
+
+ device_id = btrfs_super_last_device_id(root->fs_info->disk_super) + 1;
+ btrfs_set_super_last_device_id(root->fs_info->disk_super, device_id);
+ btrfs_set_device_id(dev_item, device_id);
+ mark_buffer_dirty(path->nodes[0]);
+
+ ret = btrfs_insert_dev_radix(root, bdev, device_id, num_blocks,
+ new_blocks);
+
+ if (!ret) {
+ btrfs_set_super_total_blocks(root->fs_info->disk_super,
+ num_blocks + new_blocks);
+ i_size_write(root->fs_info->btree_inode,
+ (num_blocks + new_blocks) <<
+ root->fs_info->btree_inode->i_blkbits);
+ }
+
+out:
+ ret = btrfs_commit_transaction(trans, dev_root);
+ BUG_ON(ret);
+ mutex_unlock(&root->fs_info->fs_mutex);
+out_nolock:
+ btrfs_free_path(path);
+
+ return ret;
+}
+
+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 = 0;
+ struct btrfs_dir_item *di;
+ int namelen;
+ struct btrfs_path *path;
+ u64 root_dirid;
+
+ 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;
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+ root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
+ mutex_lock(&root->fs_info->fs_mutex);
+ di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
+ path, root_dirid,
+ vol_args.name, namelen, 0);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ btrfs_free_path(path);
+ if (di && !IS_ERR(di))
+ return -EEXIST;
+
+ if (root == root->fs_info->tree_root)
+ ret = create_subvol(root, vol_args.name, namelen);
+ else
+ ret = create_snapshot(root, vol_args.name, namelen);
+ WARN_ON(ret);
+ break;
+ case BTRFS_IOC_ADD_DISK:
+ 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;
+ vol_args.name[namelen] = '\0';
+ ret = add_disk(root, vol_args.name, namelen);
+ break;
+ default:
+ return -ENOTTY;
+ }
+ return ret;
+}
+
static struct kmem_cache *btrfs_inode_cachep;
struct kmem_cache *btrfs_trans_handle_cachep;
struct kmem_cache *btrfs_transaction_cachep;
ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
if (!ei)
return NULL;
- ei->magic = 0xDEADBEEF;
- ei->magic2 = 0xDEADBEAF;
return &ei->vfs_inode;
}
static void btrfs_destroy_inode(struct inode *inode)
{
- struct btrfs_inode *ei = BTRFS_I(inode);
- WARN_ON(ei->magic != 0xDEADBEEF);
- WARN_ON(ei->magic2 != 0xDEADBEAF);
WARN_ON(!list_empty(&inode->i_dentry));
WARN_ON(inode->i_data.nrpages);
- ei->magic = 0;
- ei->magic2 = 0;
kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
}
btrfs_fill_super, mnt);
}
+
+static int btrfs_getattr(struct vfsmount *mnt,
+ struct dentry *dentry, struct kstat *stat)
+{
+ struct inode *inode = dentry->d_inode;
+ generic_fillattr(inode, stat);
+ stat->blksize = 256 * 1024;
+ return 0;
+}
+
+static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ struct btrfs_root *root = btrfs_sb(dentry->d_sb);
+ struct btrfs_super_block *disk_super = root->fs_info->disk_super;
+
+ buf->f_namelen = BTRFS_NAME_LEN;
+ buf->f_blocks = btrfs_super_total_blocks(disk_super);
+ buf->f_bfree = buf->f_blocks - btrfs_super_blocks_used(disk_super);
+ buf->f_bavail = buf->f_bfree;
+ buf->f_bsize = dentry->d_sb->s_blocksize;
+ buf->f_type = BTRFS_SUPER_MAGIC;
+ return 0;
+}
+
static struct file_system_type btrfs_fs_type = {
.owner = THIS_MODULE,
.name = "btrfs",
};
static struct super_operations btrfs_super_ops = {
- .statfs = simple_statfs,
.delete_inode = btrfs_delete_inode,
.put_super = btrfs_put_super,
.read_inode = btrfs_read_locked_inode,
.write_super = btrfs_write_super,
.sync_fs = btrfs_sync_fs,
.write_inode = btrfs_write_inode,
+ .dirty_inode = btrfs_dirty_inode,
.alloc_inode = btrfs_alloc_inode,
.destroy_inode = btrfs_destroy_inode,
+ .statfs = btrfs_statfs,
};
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 = {
.readpage = btrfs_readpage,
- // .readpages = btrfs_readpages,
.writepage = btrfs_writepage,
.sync_page = block_sync_page,
.prepare_write = btrfs_prepare_write,
static struct inode_operations btrfs_file_inode_operations = {
.truncate = btrfs_truncate,
+ .getattr = btrfs_getattr,
};
static struct file_operations btrfs_file_operations = {
.llseek = generic_file_llseek,
.read = do_sync_read,
- .aio_read = generic_file_aio_read,
- .write = btrfs_file_inline_write,
+ .aio_read = btrfs_file_aio_read,
+ .write = btrfs_file_write,
.mmap = generic_file_mmap,
.open = generic_file_open,
+ .ioctl = btrfs_ioctl,
+ .fsync = btrfs_sync_file,
};
static int __init init_btrfs_fs(void)
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