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Btrfs: start of support for many FS volumes 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-04-06 15:37:36 -04:00 committed by David Woodhouse
parent 3eb0314dc1
commit d6e4a428eb
9 changed files with 242 additions and 79 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
fs/btrfs/TODO
View File

@ -19,3 +19,10 @@
* fsck
* Scrub & defrag
---
metata FS ideas:
mount metadata FS on /sys/fs/btrfs/dev/
subvolumes in /sys/fs/btrfs/dev/fs/
snapshots in /sys/fs/btrfs/dev/fs/snapshots
mount -o bind
ioctl to create a snapshot

2
fs/btrfs/btrfs_inode.h
View File

@ -3,6 +3,8 @@
struct btrfs_inode {
u32 magic;
struct btrfs_root *root;
struct btrfs_key location;
struct inode vfs_inode;
u32 magic2;
};

36
fs/btrfs/ctree.h
View File

@ -3,6 +3,7 @@
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/kobject.h>
#include "bit-radix.h"
struct btrfs_trans_handle;
@ -183,13 +184,15 @@ struct btrfs_inline_data_item {
} __attribute__ ((__packed__));
struct btrfs_dir_item {
__le64 objectid;
struct btrfs_disk_key location;
__le16 flags;
__le16 name_len;
u8 type;
} __attribute__ ((__packed__));
struct btrfs_root_item {
struct btrfs_inode_item inode;
__le64 root_dirid;
__le64 blocknr;
__le32 flags;
__le64 block_limit;
@ -249,6 +252,7 @@ struct btrfs_fs_info {
struct mutex fs_mutex;
struct crypto_hash *hash_tfm;
spinlock_t hash_lock;
struct kobject kobj;
};
/*
@ -504,16 +508,6 @@ static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
item->size = cpu_to_le16(val);
}
static inline u64 btrfs_dir_objectid(struct btrfs_dir_item *d)
{
return le64_to_cpu(d->objectid);
}
static inline void btrfs_set_dir_objectid(struct btrfs_dir_item *d, u64 val)
{
d->objectid = cpu_to_le64(val);
}
static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
{
return le16_to_cpu(d->flags);
@ -724,6 +718,16 @@ static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
item->blocknr = cpu_to_le64(val);
}
static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
{
return le64_to_cpu(item->root_dirid);
}
static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
{
item->root_dirid = cpu_to_le64(val);
}
static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
{
return le32_to_cpu(item->refs);
@ -950,8 +954,8 @@ int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
btrfs_root_item *item, struct btrfs_key *key);
/* dir-item.c */
int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
*root, const char *name, int name_len, u64 dir, u64
objectid, u8 type);
*root, const char *name, int name_len, u64 dir,
struct btrfs_key *location, u8 type);
int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, u64 dir,
const char *name, int name_len, int mod);
@ -978,7 +982,8 @@ int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
*root, u64 objectid, struct btrfs_inode_item
*inode_item);
int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, u64 objectid, int mod);
*root, struct btrfs_path *path,
struct btrfs_key *location, int mod);
/* file-item.c */
int btrfs_alloc_file_extent(struct btrfs_trans_handle *trans,
@ -997,4 +1002,7 @@ int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
int btrfs_csum_verify_file_block(struct btrfs_root *root,
u64 objectid, u64 offset,
char *data, size_t len);
/* super.c */
extern struct subsystem btrfs_subsys;
#endif

14
fs/btrfs/dir-item.c
View File

@ -25,8 +25,8 @@ int insert_with_overflow(struct btrfs_trans_handle *trans, struct btrfs_root
}
int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
*root, const char *name, int name_len, u64 dir, u64
objectid, u8 type)
*root, const char *name, int name_len, u64 dir,
struct btrfs_key *location, u8 type)
{
int ret = 0;
struct btrfs_path *path;
@ -50,17 +50,21 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
dir_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
path->slots[0],
struct btrfs_dir_item);
btrfs_set_dir_objectid(dir_item, objectid);
btrfs_cpu_key_to_disk(&dir_item->location, location);
btrfs_set_dir_type(dir_item, type);
btrfs_set_dir_flags(dir_item, 0);
btrfs_set_dir_name_len(dir_item, name_len);
name_ptr = (char *)(dir_item + 1);
/* FIXME, use some real flag for selecting the extra index */
if (root == root->fs_info->tree_root)
goto out;
btrfs_memcpy(root, path->nodes[0]->b_data, name_ptr, name, name_len);
btrfs_mark_buffer_dirty(path->nodes[0]);
btrfs_release_path(root, path);
btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
key.offset = objectid;
key.offset = location->objectid;
ret = insert_with_overflow(trans, root, path, &key, data_size);
// FIXME clear the dirindex bit
if (ret)
@ -69,7 +73,7 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
dir_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
path->slots[0],
struct btrfs_dir_item);
btrfs_set_dir_objectid(dir_item, objectid);
btrfs_cpu_key_to_disk(&dir_item->location, location);
btrfs_set_dir_type(dir_item, type);
btrfs_set_dir_flags(dir_item, 0);
btrfs_set_dir_name_len(dir_item, name_len);

7
fs/btrfs/disk-io.c
View File

@ -338,7 +338,6 @@ struct btrfs_root *open_ctree(struct super_block *sb)
sb->s_blocksize);
if (!fs_info->sb_buffer) {
printk("failed2\n");
return NULL;
}
disk_super = (struct btrfs_super_block *)fs_info->sb_buffer->b_data;
@ -369,6 +368,10 @@ printk("failed2\n");
ret = btrfs_find_highest_inode(root, &root->fs_info->last_inode_alloc);
if (ret == 0)
fs_info->highest_inode = fs_info->last_inode_alloc;
memset(&fs_info->kobj, 0, sizeof(fs_info->kobj));
kobj_set_kset_s(fs_info, btrfs_subsys);
kobject_set_name(&fs_info->kobj, "%s", sb->s_id);
kobject_register(&fs_info->kobj);
mutex_unlock(&fs_info->fs_mutex);
return root;
}
@ -430,7 +433,7 @@ int close_ctree(struct btrfs_root *root)
kfree(root->fs_info->extent_root);
kfree(root->fs_info->inode_root);
kfree(root->fs_info->tree_root);
kfree(root->fs_info);
kobject_unregister(&root->fs_info->kobj);
kfree(root);
return 0;
}

26
fs/btrfs/inode-item.c
View File

@ -26,15 +26,27 @@ int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
}
int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, u64 objectid, int mod)
*root, struct btrfs_path *path,
struct btrfs_key *location, int mod)
{
struct btrfs_key key;
int ins_len = mod < 0 ? -1 : 0;
int cow = mod != 0;
int ret;
int slot;
struct btrfs_leaf *leaf;
struct btrfs_key found_key;
key.objectid = objectid;
key.flags = 0;
btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
key.offset = 0;
return btrfs_search_slot(trans, root, &key, path, ins_len, cow);
ret = btrfs_search_slot(trans, root, location, path, ins_len, cow);
if (ret > 0 && btrfs_key_type(location) == BTRFS_ROOT_ITEM_KEY &&
location->offset == (u64)-1 && path->slots[0] != 0) {
slot = path->slots[0] - 1;
leaf = btrfs_buffer_leaf(path->nodes[0]);
btrfs_disk_key_to_cpu(&found_key, &leaf->items[slot].key);
if (found_key.objectid == location->objectid &&
btrfs_key_type(&found_key) == btrfs_key_type(location)) {
path->slots[0]--;
return 0;
}
}
return ret;
}

2
fs/btrfs/print-tree.c
View File

@ -38,7 +38,7 @@ void btrfs_print_leaf(struct btrfs_root *root, struct btrfs_leaf *l)
case BTRFS_DIR_ITEM_KEY:
di = btrfs_item_ptr(l, i, struct btrfs_dir_item);
printk("\t\tdir oid %Lu flags %u type %u\n",
btrfs_dir_objectid(di),
btrfs_disk_key_objectid(&di->location),
btrfs_dir_flags(di),
btrfs_dir_type(di));
printk("\t\tname %.*s\n",

218
fs/btrfs/super.c
View File

@ -16,9 +16,23 @@
#include "transaction.h"
#include "btrfs_inode.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,
};
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;
@ -37,7 +51,8 @@ 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();
@ -46,13 +61,12 @@ static void btrfs_read_locked_inode(struct inode *inode)
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]),
@ -73,7 +87,6 @@ static void btrfs_read_locked_inode(struct inode *inode)
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;
@ -92,8 +105,11 @@ static void btrfs_read_locked_inode(struct inode *inode)
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;
@ -101,6 +117,12 @@ static void btrfs_read_locked_inode(struct inode *inode)
}
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,
@ -128,7 +150,7 @@ static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
}
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);
BUG_ON(ret);
@ -157,7 +179,7 @@ static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
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);
@ -171,7 +193,7 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *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;
@ -268,7 +290,8 @@ static int btrfs_free_inode(struct btrfs_trans_handle *trans,
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);
@ -355,7 +378,7 @@ error:
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);
@ -378,13 +401,13 @@ no_delete:
}
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();
@ -393,13 +416,13 @@ static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
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;
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);
@ -407,26 +430,76 @@ out:
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;
int ret;
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);
ret = btrfs_lookup_inode(NULL, root, path, location, 0);
if (ret)
goto out;
ri = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
path->slots[0],
struct btrfs_root_item);
location->objectid = btrfs_root_dirid(ri);
location->flags = 0;
btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
location->offset = 0;
/* FIXME properly select the root */
*sub_root = root->fs_info->fs_root;
out:
btrfs_free_path(path);
mutex_unlock(&root->fs_info->fs_mutex);
return ret;
}
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 = iget_locked(dir->i_sb, location.objectid);
if (!inode)
return ERR_PTR(-EACCES);
if (inode->i_state & I_NEW) {
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(inode);
}
check_inode(dir);
@ -436,7 +509,7 @@ static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *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;
@ -448,11 +521,16 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
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_INDEX_KEY);
btrfs_set_key_type(&key, key_type);
key.offset = filp->f_pos;
path = btrfs_alloc_path();
btrfs_init_path(path);
@ -482,10 +560,11 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
item = leaf->items + slot;
if (btrfs_disk_key_objectid(&item->key) != key.objectid)
break;
if (btrfs_disk_key_offset(&item->key) >
if (key_type == BTRFS_DIR_INDEX_KEY &&
btrfs_disk_key_offset(&item->key) >
root->fs_info->highest_inode)
break;
if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_INDEX_KEY)
if (btrfs_disk_key_type(&item->key) != key_type)
continue;
if (btrfs_disk_key_offset(&item->key) < filp->f_pos)
continue;
@ -495,7 +574,7 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
over = filldir(dirent, (const char *)(di + 1),
btrfs_dir_name_len(di),
btrfs_disk_key_offset(&item->key),
btrfs_dir_objectid(di), d_type);
btrfs_disk_key_objectid(&di->location), d_type);
if (over)
goto nopos;
}
@ -527,6 +606,7 @@ static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
struct dentry * root_dentry;
struct btrfs_super_block *disk_super;
struct btrfs_root *root;
struct btrfs_inode *bi;
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_magic = BTRFS_SUPER_MAGIC;
@ -546,6 +626,13 @@ static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
btrfs_super_root_dir(disk_super));
inode = iget_locked(sb, btrfs_super_root_dir(disk_super));
bi = BTRFS_I(inode);
bi->location.objectid = inode->i_ino;
bi->location.offset = 0;
bi->location.flags = 0;
bi->root = root->fs_info->tree_root;
btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY);
if (!inode)
return -ENOMEM;
if (inode->i_state & I_NEW) {
@ -594,7 +681,8 @@ static int btrfs_update_inode(struct btrfs_trans_handle *trans,
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;
@ -616,7 +704,7 @@ failed:
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;
@ -637,8 +725,8 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
{
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 *key;
int ret;
u64 objectid;
@ -646,6 +734,8 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
if (!inode)
return ERR_PTR(-ENOMEM);
BTRFS_I(inode)->root = BTRFS_I(dir)->root;
key = &BTRFS_I(inode)->location;
check_inode(inode);
ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
BUG_ON(ret);
@ -658,11 +748,11 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
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);
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);
ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
@ -678,13 +768,20 @@ static int btrfs_add_link(struct btrfs_trans_handle *trans,
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 * 2;
ret = btrfs_update_inode(trans, btrfs_sb(inode->i_sb),
ret = btrfs_update_inode(trans, root,
dentry->d_parent->d_inode);
}
check_inode(inode);
@ -710,7 +807,7 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
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;
@ -747,18 +844,26 @@ out_unlock:
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 = 6;
@ -771,7 +876,7 @@ static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
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;
@ -910,7 +1015,7 @@ static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
u64 extent_end = 0;
u64 objectid = inode->i_ino;
struct btrfs_path *path;
struct btrfs_root *root = btrfs_sb(inode->i_sb);
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans = NULL;
struct btrfs_file_extent_item *item;
struct btrfs_leaf *leaf;
@ -999,7 +1104,7 @@ static int btrfs_get_block(struct inode *inode, sector_t iblock,
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);
@ -1041,7 +1146,7 @@ static int btrfs_writepage(struct page *page, struct writeback_control *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;
@ -1208,7 +1313,7 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
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 btrfs_root *root = BTRFS_I(inode)->root;
struct page *pages[1];
if (file->f_flags & O_DIRECT)
@ -1365,7 +1470,7 @@ static ssize_t btrfs_file_inline_write(struct file *file,
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 btrfs_root *root = BTRFS_I(inode)->root;
unsigned long page_index;
if (file->f_flags & O_DIRECT)
@ -1432,13 +1537,14 @@ static int btrfs_read_actor(read_descriptor_t *desc, struct page *page,
{
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,
@ -1662,6 +1768,10 @@ 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,
@ -1697,13 +1807,21 @@ 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");
}

9
fs/btrfs/transaction.c
View File

@ -52,6 +52,8 @@ struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS);
int ret;
/* FIXME, use the right root */
root = root->fs_info->fs_root;
mutex_lock(&root->fs_info->trans_mutex);
ret = join_transaction(root);
BUG_ON(ret);
@ -69,6 +71,10 @@ int btrfs_end_transaction(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
struct btrfs_transaction *cur_trans;
/* FIXME, use the right root */
root = root->fs_info->fs_root;
WARN_ON(trans->magic != TRANS_MAGIC);
WARN_ON(trans->magic2 != TRANS_MAGIC);
mutex_lock(&root->fs_info->trans_mutex);
@ -148,6 +154,9 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
struct btrfs_transaction *cur_trans;
DEFINE_WAIT(wait);
/* FIXME, use the right root */
root = root->fs_info->fs_root;
mutex_lock(&root->fs_info->trans_mutex);
if (trans->transaction->in_commit) {
printk("already in commit!, waiting\n");