#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,
-};
+#include "print-tree.h"
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_symlink_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 address_space_operations btrfs_symlink_aops;
static struct file_operations btrfs_file_operations;
+static int drop_extents(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct inode *inode,
+ u64 start, u64 end, u64 *hint_block);
+static int btrfs_get_block(struct inode *inode, sector_t iblock,
+ struct buffer_head *result, int create);
+
+
+#define S_SHIFT 12
+static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
+ [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
+ [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
+ [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
+ [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
+ [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
+ [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
+ [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
+};
+
static void btrfs_read_locked_inode(struct inode *inode)
{
struct btrfs_path *path;
struct btrfs_inode_item *inode_item;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_key location;
+ struct btrfs_block_group_cache *alloc_group;
+ u64 alloc_group_block;
int ret;
path = btrfs_alloc_path();
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);
+ alloc_group_block = btrfs_inode_block_group(inode_item);
+ ret = radix_tree_gang_lookup(&root->fs_info->block_group_radix,
+ (void **)&alloc_group,
+ alloc_group_block, 1);
+ BUG_ON(!ret);
+ BTRFS_I(inode)->block_group = alloc_group;
btrfs_free_path(path);
inode_item = NULL;
inode->i_op = &btrfs_dir_inode_operations;
break;
case S_IFLNK:
- // inode->i_op = &page_symlink_inode_operations;
+ inode->i_op = &btrfs_symlink_inode_operations;
+ inode->i_mapping->a_ops = &btrfs_symlink_aops;
break;
}
return;
btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec);
btrfs_set_inode_nblocks(item, inode->i_blocks);
btrfs_set_inode_generation(item, inode->i_generation);
+ btrfs_set_inode_block_group(item,
+ BTRFS_I(inode)->block_group->key.objectid);
}
-
static int btrfs_update_inode(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct inode *inode)
root = BTRFS_I(dir)->root;
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, dir);
ret = btrfs_unlink_trans(trans, root, dir, dentry);
btrfs_end_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
+ btrfs_btree_balance_dirty(root);
return ret;
}
btrfs_init_path(path);
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, dir);
key.objectid = inode->i_ino;
key.offset = (u64)-1;
key.flags = (u32)-1;
btrfs_free_path(path);
mutex_unlock(&root->fs_info->fs_mutex);
ret = btrfs_end_transaction(trans, root);
+ btrfs_btree_balance_dirty(root);
if (ret && !err)
err = ret;
return err;
return ret;
}
+static void reada_truncate(struct btrfs_root *root, struct btrfs_path *path,
+ u64 objectid)
+{
+ struct btrfs_node *node;
+ int i;
+ int nritems;
+ u64 item_objectid;
+ u64 blocknr;
+ int slot;
+ int ret;
+
+ if (!path->nodes[1])
+ return;
+ node = btrfs_buffer_node(path->nodes[1]);
+ slot = path->slots[1];
+ if (slot == 0)
+ return;
+ nritems = btrfs_header_nritems(&node->header);
+ for (i = slot - 1; i >= 0; i--) {
+ item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key);
+ if (item_objectid != objectid)
+ break;
+ blocknr = btrfs_node_blockptr(node, i);
+ ret = readahead_tree_block(root, blocknr);
+ if (ret)
+ break;
+ }
+}
+
static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct inode *inode)
struct btrfs_path *path;
struct btrfs_key key;
struct btrfs_disk_key *found_key;
+ u32 found_type;
struct btrfs_leaf *leaf;
- struct btrfs_file_extent_item *fi = NULL;
+ struct btrfs_file_extent_item *fi;
u64 extent_start = 0;
u64 extent_num_blocks = 0;
+ u64 item_end = 0;
int found_extent;
+ int del_item;
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;
- /*
- * use BTRFS_CSUM_ITEM_KEY because it is larger than inline keys
- * or extent data
- */
- btrfs_set_key_type(&key, BTRFS_CSUM_ITEM_KEY);
+ key.flags = (u32)-1;
while(1) {
btrfs_init_path(path);
+ fi = NULL;
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret < 0) {
goto error;
BUG_ON(path->slots[0] == 0);
path->slots[0]--;
}
+ reada_truncate(root, path, inode->i_ino);
leaf = btrfs_buffer_leaf(path->nodes[0]);
found_key = &leaf->items[path->slots[0]].key;
+ found_type = btrfs_disk_key_type(found_key);
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_EXTENT_DATA_KEY)
+ if (found_type != BTRFS_CSUM_ITEM_KEY &&
+ found_type != BTRFS_DIR_ITEM_KEY &&
+ found_type != BTRFS_DIR_INDEX_KEY &&
+ found_type != 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) {
+ item_end = btrfs_disk_key_offset(found_key);
+ if (found_type == BTRFS_EXTENT_DATA_KEY) {
fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
path->slots[0],
struct btrfs_file_extent_item);
if (btrfs_file_extent_type(fi) !=
BTRFS_FILE_EXTENT_INLINE) {
+ item_end += btrfs_file_extent_num_blocks(fi) <<
+ inode->i_blkbits;
+ }
+ }
+ if (found_type == BTRFS_CSUM_ITEM_KEY) {
+ ret = btrfs_csum_truncate(trans, root, path,
+ inode->i_size);
+ BUG_ON(ret);
+ }
+ if (item_end < inode->i_size) {
+ if (found_type) {
+ btrfs_set_key_type(&key, found_type - 1);
+ continue;
+ }
+ break;
+ }
+ if (btrfs_disk_key_offset(found_key) >= inode->i_size)
+ del_item = 1;
+ else
+ del_item = 0;
+ found_extent = 0;
+
+ if (found_type == BTRFS_EXTENT_DATA_KEY &&
+ btrfs_file_extent_type(fi) !=
+ BTRFS_FILE_EXTENT_INLINE) {
+ u64 num_dec;
+ if (!del_item) {
+ u64 orig_num_blocks =
+ btrfs_file_extent_num_blocks(fi);
+ extent_num_blocks = inode->i_size -
+ btrfs_disk_key_offset(found_key) +
+ root->blocksize - 1;
+ extent_num_blocks >>= inode->i_blkbits;
+ btrfs_set_file_extent_num_blocks(fi,
+ extent_num_blocks);
+ inode->i_blocks -= (orig_num_blocks -
+ extent_num_blocks) << 3;
+ mark_buffer_dirty(path->nodes[0]);
+ } else {
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;
+ num_dec = btrfs_file_extent_num_blocks(fi) << 3;
+ if (extent_start != 0) {
+ found_extent = 1;
+ inode->i_blocks -= num_dec;
+ }
}
}
- ret = btrfs_del_item(trans, root, path);
- BUG_ON(ret);
+ if (del_item) {
+ ret = btrfs_del_item(trans, root, path);
+ BUG_ON(ret);
+ } else {
+ break;
+ }
btrfs_release_path(root, path);
if (found_extent) {
ret = btrfs_free_extent(trans, root, extent_start,
return ret;
}
+static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
+{
+ struct inode *inode = mapping->host;
+ unsigned blocksize = 1 << inode->i_blkbits;
+ pgoff_t index = from >> PAGE_CACHE_SHIFT;
+ unsigned offset = from & (PAGE_CACHE_SIZE-1);
+ struct page *page;
+ char *kaddr;
+ int ret = 0;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ u64 alloc_hint;
+ struct btrfs_key ins;
+ struct btrfs_trans_handle *trans;
+
+ if ((offset & (blocksize - 1)) == 0)
+ goto out;
+
+ ret = -ENOMEM;
+ page = grab_cache_page(mapping, index);
+ if (!page)
+ goto out;
+
+ if (!PageUptodate(page)) {
+ ret = mpage_readpage(page, btrfs_get_block);
+ lock_page(page);
+ if (!PageUptodate(page)) {
+ ret = -EIO;
+ goto out;
+ }
+ }
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, inode);
+
+ ret = drop_extents(trans, root, inode, page->index << PAGE_CACHE_SHIFT,
+ (page->index + 1) << PAGE_CACHE_SHIFT, &alloc_hint);
+ BUG_ON(ret);
+ ret = btrfs_alloc_extent(trans, root, inode->i_ino, 1,
+ alloc_hint, (u64)-1, &ins, 1);
+ BUG_ON(ret);
+ ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
+ page->index << PAGE_CACHE_SHIFT,
+ ins.objectid, 1, 1);
+ BUG_ON(ret);
+ SetPageChecked(page);
+ kaddr = kmap(page);
+ memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
+ flush_dcache_page(page);
+ btrfs_csum_file_block(trans, root, inode->i_ino,
+ page->index << PAGE_CACHE_SHIFT,
+ kaddr, PAGE_CACHE_SIZE);
+ kunmap(page);
+ btrfs_end_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+
+ set_page_dirty(page);
+ unlock_page(page);
+ page_cache_release(page);
+out:
+ return ret;
+}
+
+static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
+{
+ struct inode *inode = dentry->d_inode;
+ int err;
+
+ err = inode_change_ok(inode, attr);
+ if (err)
+ return err;
+
+ if (S_ISREG(inode->i_mode) &&
+ attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
+ struct btrfs_trans_handle *trans;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ u64 mask = root->blocksize - 1;
+ u64 pos = (inode->i_size + mask) & ~mask;
+ u64 hole_size;
+
+ if (attr->ia_size <= pos)
+ goto out;
+
+ btrfs_truncate_page(inode->i_mapping, inode->i_size);
+
+ hole_size = (attr->ia_size - pos + mask) & ~mask;
+ hole_size >>= inode->i_blkbits;
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, inode);
+ err = btrfs_insert_file_extent(trans, root, inode->i_ino,
+ pos, 0, 0, hole_size);
+ BUG_ON(err);
+ btrfs_end_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ }
+out:
+ err = inode_setattr(inode, attr);
+
+ return err;
+}
static void btrfs_delete_inode(struct inode *inode)
{
struct btrfs_trans_handle *trans;
inode->i_size = 0;
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
- if (S_ISREG(inode->i_mode)) {
- ret = btrfs_truncate_in_trans(trans, root, inode);
- BUG_ON(ret);
- }
+ btrfs_set_trans_block_group(trans, inode);
+ ret = btrfs_truncate_in_trans(trans, root, inode);
+ BUG_ON(ret);
btrfs_free_inode(trans, root, inode);
btrfs_end_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
+ btrfs_btree_balance_dirty(root);
return;
no_delete:
clear_inode(inode);
return ret;
}
-int fixup_tree_root_location(struct btrfs_root *root,
+static int fixup_tree_root_location(struct btrfs_root *root,
struct btrfs_key *location,
struct btrfs_root **sub_root)
{
return 0;
}
-int btrfs_init_locked_inode(struct inode *inode, void *p)
+static int btrfs_init_locked_inode(struct inode *inode, void *p)
{
struct btrfs_iget_args *args = p;
inode->i_ino = args->ino;
return 0;
}
-int btrfs_find_actor(struct inode *inode, void *opaque)
+static 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)
+static struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
+ struct btrfs_root *root)
{
struct inode *inode;
struct btrfs_iget_args args;
return d_splice_alias(inode, dentry);
}
+static void reada_leaves(struct btrfs_root *root, struct btrfs_path *path,
+ u64 objectid)
+{
+ struct btrfs_node *node;
+ int i;
+ u32 nritems;
+ u64 item_objectid;
+ u64 blocknr;
+ int slot;
+ int ret;
+
+ if (!path->nodes[1])
+ return;
+ node = btrfs_buffer_node(path->nodes[1]);
+ slot = path->slots[1];
+ nritems = btrfs_header_nritems(&node->header);
+ for (i = slot + 1; i < nritems; i++) {
+ item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key);
+ if (item_objectid != objectid)
+ break;
+ blocknr = btrfs_node_blockptr(node, i);
+ ret = readahead_tree_block(root, blocknr);
+ if (ret)
+ break;
+ }
+}
+static unsigned char btrfs_filetype_table[] = {
+ DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
+};
+
static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
struct inode *inode = filp->f_path.dentry->d_inode;
struct btrfs_leaf *leaf;
int slot;
int advance;
- unsigned char d_type = DT_UNKNOWN;
+ unsigned char d_type;
int over = 0;
u32 di_cur;
u32 di_total;
if (ret < 0)
goto err;
advance = 0;
+ reada_leaves(root, path, inode->i_ino);
while(1) {
leaf = btrfs_buffer_leaf(path->nodes[0]);
nritems = btrfs_header_nritems(&leaf->header);
slot = path->slots[0];
if (advance || slot >= nritems) {
if (slot >= nritems -1) {
+ reada_leaves(root, path, inode->i_ino);
ret = btrfs_next_leaf(root, path);
if (ret)
break;
di_cur = 0;
di_total = btrfs_item_size(leaf->items + slot);
while(di_cur < di_total) {
+ d_type = btrfs_filetype_table[btrfs_dir_type(di)];
over = filldir(dirent, (const char *)(di + 1),
btrfs_dir_name_len(di),
btrfs_disk_key_offset(&item->key),
if (wait) {
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, inode);
ret = btrfs_commit_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
}
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, inode);
btrfs_update_inode(trans, root, inode);
btrfs_end_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
+ btrfs_btree_balance_dirty(root);
}
static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
- u64 objectid, int mode)
+ u64 objectid,
+ struct btrfs_block_group_cache *group,
+ int mode)
{
struct inode *inode;
struct btrfs_inode_item inode_item;
struct btrfs_key *location;
int ret;
+ int owner;
inode = new_inode(root->fs_info->sb);
if (!inode)
return ERR_PTR(-ENOMEM);
BTRFS_I(inode)->root = root;
+ if (mode & S_IFDIR)
+ owner = 0;
+ else
+ owner = 1;
+ group = btrfs_find_block_group(root, group, 0, 0, owner);
+ BTRFS_I(inode)->block_group = group;
inode->i_uid = current->fsuid;
inode->i_gid = current->fsgid;
return inode;
}
+static inline u8 btrfs_inode_type(struct inode *inode)
+{
+ return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
+}
+
static int btrfs_add_link(struct btrfs_trans_handle *trans,
struct dentry *dentry, struct inode *inode)
{
ret = btrfs_insert_dir_item(trans, root,
dentry->d_name.name, dentry->d_name.len,
dentry->d_parent->d_inode->i_ino,
- &key, 0);
+ &key, btrfs_inode_type(inode));
if (ret == 0) {
dentry->d_parent->d_inode->i_size += dentry->d_name.len * 2;
ret = btrfs_update_inode(trans, root,
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, dir);
err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
if (err) {
goto out_unlock;
}
- inode = btrfs_new_inode(trans, root, objectid, mode);
+ inode = btrfs_new_inode(trans, root, objectid,
+ BTRFS_I(dir)->block_group, mode);
err = PTR_ERR(inode);
if (IS_ERR(inode))
goto out_unlock;
- // FIXME mark the inode dirty
+
+ btrfs_set_trans_block_group(trans, inode);
err = btrfs_add_nondir(trans, dentry, inode);
if (err)
drop_inode = 1;
inode->i_op = &btrfs_file_inode_operations;
}
dir->i_sb->s_dirt = 1;
+ btrfs_update_inode_block_group(trans, inode);
+ btrfs_update_inode_block_group(trans, dir);
out_unlock:
btrfs_end_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
inode_dec_link_count(inode);
iput(inode);
}
+ btrfs_btree_balance_dirty(root);
+ return err;
+}
+
+static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
+ struct dentry *dentry)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_root *root = BTRFS_I(dir)->root;
+ struct inode *inode = old_dentry->d_inode;
+ int err;
+ int drop_inode = 0;
+
+ if (inode->i_nlink == 0)
+ return -ENOENT;
+
+ inc_nlink(inode);
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, dir);
+ atomic_inc(&inode->i_count);
+ err = btrfs_add_nondir(trans, dentry, inode);
+ if (err)
+ drop_inode = 1;
+ dir->i_sb->s_dirt = 1;
+ btrfs_update_inode_block_group(trans, dir);
+ btrfs_update_inode(trans, root, inode);
+
+ btrfs_end_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+
+ if (drop_inode) {
+ inode_dec_link_count(inode);
+ iput(inode);
+ }
+ btrfs_btree_balance_dirty(root);
return err;
}
btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid,
- &key, 1);
+ &key, BTRFS_FT_DIR);
if (ret)
goto error;
key.objectid = dirid;
ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid,
- &key, 1);
+ &key, BTRFS_FT_DIR);
if (ret)
goto error;
error:
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, dir);
if (IS_ERR(trans)) {
err = PTR_ERR(trans);
goto out_unlock;
goto out_unlock;
}
- inode = btrfs_new_inode(trans, root, objectid, S_IFDIR | mode);
+ inode = btrfs_new_inode(trans, root, objectid,
+ BTRFS_I(dir)->block_group, S_IFDIR | mode);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
goto out_fail;
drop_on_err = 1;
inode->i_op = &btrfs_dir_inode_operations;
inode->i_fop = &btrfs_dir_file_operations;
+ btrfs_set_trans_block_group(trans, inode);
err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino);
if (err)
d_instantiate(dentry, inode);
drop_on_err = 0;
dir->i_sb->s_dirt = 1;
+ btrfs_update_inode_block_group(trans, inode);
+ btrfs_update_inode_block_group(trans, dir);
out_fail:
btrfs_end_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
if (drop_on_err)
iput(inode);
+ btrfs_btree_balance_dirty(root);
return err;
}
filemap_flush(root->fs_info->btree_inode->i_mapping);
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;
}
+#define BTRFS_GET_BLOCK_NO_CREATE 0
+#define BTRFS_GET_BLOCK_CREATE 1
+#define BTRFS_GET_BLOCK_NO_DIRECT 2
+
static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
struct buffer_head *result, int create)
{
u64 extent_end = 0;
u64 objectid = inode->i_ino;
u32 found_type;
+ u64 alloc_hint = 0;
struct btrfs_path *path;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_file_extent_item *item;
struct btrfs_leaf *leaf;
struct btrfs_disk_key *found_key;
+ struct btrfs_trans_handle *trans = NULL;
path = btrfs_alloc_path();
BUG_ON(!path);
btrfs_init_path(path);
- if (create) {
+ if (create & BTRFS_GET_BLOCK_CREATE) {
WARN_ON(1);
+ /* this almost but not quite works */
+ trans = btrfs_start_transaction(root, 1);
+ if (!trans) {
+ err = -ENOMEM;
+ goto out;
+ }
+ ret = drop_extents(trans, root, inode,
+ iblock << inode->i_blkbits,
+ (iblock + 1) << inode->i_blkbits,
+ &alloc_hint);
+ BUG_ON(ret);
}
ret = btrfs_lookup_file_extent(NULL, root, path,
if (ret != 0) {
if (path->slots[0] == 0) {
btrfs_release_path(root, path);
- goto out;
+ goto not_found;
}
path->slots[0]--;
}
found_type != BTRFS_EXTENT_DATA_KEY) {
extent_end = 0;
extent_start = 0;
- btrfs_release_path(root, path);
- goto out;
+ goto not_found;
}
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);
+ err = 0;
+ if (btrfs_file_extent_disk_blocknr(item) == 0)
+ goto out;
if (iblock >= extent_start && iblock < extent_end) {
- err = 0;
btrfs_map_bh_to_logical(root, result, blocknr +
iblock - extent_start);
goto out;
char *ptr;
char *map;
u32 size;
+
+ if (create & BTRFS_GET_BLOCK_NO_DIRECT) {
+ err = -EINVAL;
+ goto out;
+ }
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;
+ goto not_found;
}
ptr = btrfs_file_extent_inline_start(item);
map = kmap(result->b_page);
SetPageChecked(result->b_page);
btrfs_map_bh_to_logical(root, result, 0);
}
+not_found:
+ if (create & BTRFS_GET_BLOCK_CREATE) {
+ struct btrfs_key ins;
+ ret = btrfs_alloc_extent(trans, root, inode->i_ino,
+ 1, alloc_hint, (u64)-1,
+ &ins, 1);
+ BUG_ON(ret);
+ ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
+ iblock << inode->i_blkbits,
+ ins.objectid, ins.offset,
+ ins.offset);
+ BUG_ON(ret);
+ SetPageChecked(result->b_page);
+ btrfs_map_bh_to_logical(root, result, ins.objectid);
+ }
out:
- btrfs_release_path(root, path);
+ if (trans)
+ err = btrfs_end_transaction(trans, root);
btrfs_free_path(path);
return err;
}
return err;
}
+static int btrfs_get_block_bmap(struct inode *inode, sector_t iblock,
+ struct buffer_head *result, int create)
+{
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ mutex_lock(&root->fs_info->fs_mutex);
+ btrfs_get_block_lock(inode, iblock, result, BTRFS_GET_BLOCK_NO_DIRECT);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return 0;
+}
+
+static sector_t btrfs_bmap(struct address_space *as, sector_t block)
+{
+ return generic_block_bmap(as, block, btrfs_get_block_bmap);
+}
+
static int btrfs_prepare_write(struct file *file, struct page *page,
unsigned from, unsigned to)
{
- return nobh_prepare_write(page, from, to, btrfs_get_block);
+ return block_prepare_write(page, from, to, btrfs_get_block);
}
static void btrfs_write_super(struct super_block *sb)
} else if (!buffer_mapped(bh) && buffer_dirty(bh)) {
WARN_ON(bh->b_size != blocksize);
err = btrfs_get_block(inode, block, bh, 0);
- if (err)
+ if (err) {
+printk("writepage going to recovery err %d\n", 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;
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;
if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
return;
- nobh_truncate_page(inode->i_mapping, inode->i_size);
+ btrfs_truncate_page(inode->i_mapping, inode->i_size);
- /* FIXME, add redo link to tree so we don't leak on crash */
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, inode);
+
+ /* FIXME, add redo link to tree so we don't leak on crash */
ret = btrfs_truncate_in_trans(trans, root, inode);
BUG_ON(ret);
+ btrfs_update_inode(trans, root, inode);
ret = btrfs_end_transaction(trans, root);
BUG_ON(ret);
mutex_unlock(&root->fs_info->fs_mutex);
- mark_inode_dirty(inode);
+ btrfs_btree_balance_dirty(root);
}
-/*
- * 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)
{
SetPageUptodate(page);
bh = page_buffers(page);
+ set_buffer_uptodate(bh);
if (buffer_mapped(bh) && bh->b_blocknr != 0) {
set_page_dirty(page);
}
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, inode);
bh = page_buffers(pages[i]);
if (buffer_mapped(bh) && bh->b_blocknr == 0) {
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);
+ btrfs_memcpy(root, path->nodes[0]->b_data,
+ ptr, bh->b_data, offset + write_bytes);
mark_buffer_dirty(path->nodes[0]);
btrfs_free_path(path);
- } else {
+ } else if (buffer_mapped(bh)) {
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]);
+ // btrfs_update_inode_block_group(trans, inode);
ret = btrfs_end_transaction(trans, root);
BUG_ON(ret);
mutex_unlock(&root->fs_info->fs_mutex);
static int drop_extents(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct inode *inode,
- u64 start, u64 end)
+ u64 start, u64 end, u64 *hint_block)
{
int ret;
struct btrfs_key key;
goto out;
}
- search_start = extent_end;
+ if (found_inline) {
+ u64 mask = root->blocksize - 1;
+ search_start = (extent_end + mask) & ~mask;
+ } else
+ search_start = extent_end;
if (end < extent_end && end >= key.offset) {
if (found_extent) {
+ u64 disk_blocknr =
+ btrfs_file_extent_disk_blocknr(extent);
+ u64 disk_num_blocks =
+ btrfs_file_extent_disk_num_blocks(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);
+ if (disk_blocknr != 0) {
+ ret = btrfs_inc_extent_ref(trans, root,
+ disk_blocknr, disk_num_blocks);
+ BUG_ON(ret);
+ }
}
WARN_ON(found_inline);
bookend = 1;
new_num = (start - key.offset) >>
inode->i_blkbits;
old_num = btrfs_file_extent_num_blocks(extent);
- inode->i_blocks -= (old_num - new_num) << 3;
+ *hint_block =
+ btrfs_file_extent_disk_blocknr(extent);
+ if (btrfs_file_extent_disk_blocknr(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) {
btrfs_file_extent_disk_num_blocks(extent);
extent_num_blocks =
btrfs_file_extent_num_blocks(extent);
+ *hint_block =
+ btrfs_file_extent_disk_blocknr(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;
+ extent = NULL;
+ if (found_extent && disk_blocknr != 0) {
+ inode->i_blocks -= extent_num_blocks << 3;
ret = btrfs_free_extent(trans, root,
disk_blocknr,
disk_num_blocks, 0);
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);
+ (extent_end - end) >> inode->i_blkbits);
btrfs_set_file_extent_num_blocks(extent,
- btrfs_file_extent_num_blocks(&old) -
- ((end - key.offset) >> inode->i_blkbits));
+ (extent_end - end) >> 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;
+ if (btrfs_file_extent_disk_blocknr(&old) != 0) {
+ inode->i_blocks +=
+ btrfs_file_extent_num_blocks(extent) << 3;
+ }
ret = 0;
goto out;
}
err = -ENOMEM;
goto failed_release;
}
+ cancel_dirty_page(pages[i], PAGE_CACHE_SIZE);
+ wait_on_page_writeback(pages[i]);
offset = pos & (PAGE_CACHE_SIZE -1);
this_write = min(PAGE_CACHE_SIZE - offset, write_bytes);
- create_empty_buffers(pages[i], root->fs_info->sb->s_blocksize,
- (1 << BH_Uptodate));
+ if (!page_has_buffers(pages[i])) {
+ create_empty_buffers(pages[i],
+ root->fs_info->sb->s_blocksize,
+ (1 << BH_Uptodate));
+ }
head = page_buffers(pages[i]);
bh = head;
do {
struct inode *inode = file->f_path.dentry->d_inode;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct page *pages[8];
- struct page *pinned[2] = { NULL, NULL };
+ struct page *pinned[2];
unsigned long first_index;
unsigned long last_index;
u64 start_pos;
u64 num_blocks;
u64 alloc_extent_start;
+ u64 hint_block;
struct btrfs_trans_handle *trans;
struct btrfs_key ins;
-
+ pinned[0] = NULL;
+ pinned[1] = NULL;
if (file->f_flags & O_DIRECT)
return -EINVAL;
pos = *ppos;
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))) {
+ if ((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);
+ wait_on_page_locked(pinned[0]);
} else {
unlock_page(pinned[0]);
}
}
- if (first_index != last_index &&
- (last_index << PAGE_CACHE_SHIFT) < inode->i_size &&
- (count & (PAGE_CACHE_SIZE - 1))) {
+ if ((pos + 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);
+ wait_on_page_locked(pinned[1]);
} else {
unlock_page(pinned[1]);
}
mutex_unlock(&root->fs_info->fs_mutex);
goto out_unlock;
}
+ btrfs_set_trans_block_group(trans, inode);
/* FIXME blocksize != 4096 */
inode->i_blocks += num_blocks << 3;
+ hint_block = 0;
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));
+ ~((u64)root->blocksize - 1), &hint_block);
+ BUG_ON(ret);
+ }
+ if (inode->i_size < start_pos) {
+ u64 last_pos_in_file;
+ u64 hole_size;
+ u64 mask = root->blocksize - 1;
+ last_pos_in_file = (inode->i_size + mask) & ~mask;
+ hole_size = (start_pos - last_pos_in_file + mask) & ~mask;
+ hole_size >>= inode->i_blkbits;
+ if (last_pos_in_file < start_pos) {
+ ret = btrfs_insert_file_extent(trans, root,
+ inode->i_ino,
+ last_pos_in_file,
+ 0, 0, hole_size);
+ }
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,
- num_blocks, 1, (u64)-1, &ins);
+ num_blocks, hint_block, (u64)-1,
+ &ins, 1);
BUG_ON(ret);
ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
- start_pos, ins.objectid, ins.offset);
+ start_pos, ins.objectid, ins.offset,
+ ins.offset);
BUG_ON(ret);
} else {
ins.offset = 0;
}
BUG_ON(ret);
alloc_extent_start = ins.objectid;
+ // btrfs_update_inode_block_group(trans, inode);
ret = btrfs_end_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
num_written += write_bytes;
balance_dirty_pages_ratelimited(inode->i_mapping);
+ btrfs_btree_balance_dirty(root);
cond_resched();
}
out_unlock:
if (!PageChecked(page)) {
/* FIXME, do it per block */
struct btrfs_root *root = BTRFS_I(inode)->root;
+ int ret;
+ struct buffer_head *bh;
+
+ if (page_has_buffers(page)) {
+ bh = page_buffers(page);
+ if (!buffer_mapped(bh)) {
+ SetPageChecked(page);
+ goto checked;
+ }
+ }
- int ret = btrfs_csum_verify_file_block(root,
+ 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);
+ if (ret != -ENOENT) {
+ printk("failed to verify ino %lu page %lu ret %d\n",
+ page->mapping->host->i_ino,
+ page->index, ret);
+ memset(page_address(page), 1, PAGE_CACHE_SIZE);
+ flush_dcache_page(page);
+ }
}
SetPageChecked(page);
kunmap(page);
}
+checked:
/*
* Faults on the destination of a read are common, so do it before
* taking the kmap.
struct btrfs_leaf *leaf;
struct btrfs_root *new_root;
struct inode *inode;
+ struct inode *dir;
int ret;
u64 objectid;
u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
trans = btrfs_start_transaction(root, 1);
BUG_ON(!trans);
- subvol = btrfs_alloc_free_block(trans, root);
+ subvol = btrfs_alloc_free_block(trans, root, 0);
if (subvol == NULL)
return -ENOSPC;
leaf = btrfs_buffer_leaf(subvol);
* insert the directory item
*/
key.offset = (u64)-1;
+ dir = root->fs_info->sb->s_root->d_inode;
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);
+ name, namelen, dir->i_ino, &key,
+ BTRFS_FT_DIR);
BUG_ON(ret);
ret = btrfs_commit_transaction(trans, root);
trans = btrfs_start_transaction(new_root, 1);
BUG_ON(!trans);
- inode = btrfs_new_inode(trans, new_root, new_dirid, S_IFDIR | 0700);
+ inode = btrfs_new_inode(trans, new_root, new_dirid,
+ BTRFS_I(dir)->block_group, S_IFDIR | 0700);
inode->i_op = &btrfs_dir_inode_operations;
inode->i_fop = &btrfs_dir_file_operations;
iput(inode);
mutex_unlock(&root->fs_info->fs_mutex);
+ btrfs_btree_balance_dirty(root);
return 0;
}
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);
+ &key, BTRFS_FT_DIR);
BUG_ON(ret);
ret = btrfs_commit_transaction(trans, root);
BUG_ON(ret);
mutex_unlock(&root->fs_info->fs_mutex);
+ btrfs_btree_balance_dirty(root);
return 0;
}
mutex_unlock(&root->fs_info->fs_mutex);
out_nolock:
btrfs_free_path(path);
+ btrfs_btree_balance_dirty(root);
return ret;
}
{
struct btrfs_inode *ei = (struct btrfs_inode *) foo;
- if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+ if ((flags & (SLAB_CTOR_CONSTRUCTOR)) ==
SLAB_CTOR_CONSTRUCTOR) {
inode_init_once(&ei->vfs_inode);
}
btrfs_fill_super, mnt);
}
-
static int btrfs_getattr(struct vfsmount *mnt,
struct dentry *dentry, struct kstat *stat)
{
return 0;
}
+static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
+ struct inode * new_dir,struct dentry *new_dentry)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_root *root = BTRFS_I(old_dir)->root;
+ struct inode *new_inode = new_dentry->d_inode;
+ struct inode *old_inode = old_dentry->d_inode;
+ struct timespec ctime = CURRENT_TIME;
+ struct btrfs_path *path;
+ struct btrfs_dir_item *di;
+ int ret;
+
+ if (S_ISDIR(old_inode->i_mode) && new_inode &&
+ new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
+ return -ENOTEMPTY;
+ }
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, new_dir);
+ path = btrfs_alloc_path();
+ if (!path) {
+ ret = -ENOMEM;
+ goto out_fail;
+ }
+
+ old_dentry->d_inode->i_nlink++;
+ old_dir->i_ctime = old_dir->i_mtime = ctime;
+ new_dir->i_ctime = new_dir->i_mtime = ctime;
+ old_inode->i_ctime = ctime;
+ if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
+ struct btrfs_key *location = &BTRFS_I(new_dir)->location;
+ u64 old_parent_oid;
+ di = btrfs_lookup_dir_item(trans, root, path, old_inode->i_ino,
+ "..", 2, -1);
+ if (IS_ERR(di)) {
+ ret = PTR_ERR(di);
+ goto out_fail;
+ }
+ if (!di) {
+ ret = -ENOENT;
+ goto out_fail;
+ }
+ old_parent_oid = btrfs_disk_key_objectid(&di->location);
+ ret = btrfs_del_item(trans, root, path);
+ if (ret) {
+ ret = -EIO;
+ goto out_fail;
+ }
+ btrfs_release_path(root, path);
+
+ di = btrfs_lookup_dir_index_item(trans, root, path,
+ old_inode->i_ino,
+ old_parent_oid,
+ "..", 2, -1);
+ if (IS_ERR(di)) {
+ ret = PTR_ERR(di);
+ goto out_fail;
+ }
+ if (!di) {
+ ret = -ENOENT;
+ goto out_fail;
+ }
+ ret = btrfs_del_item(trans, root, path);
+ if (ret) {
+ ret = -EIO;
+ goto out_fail;
+ }
+ btrfs_release_path(root, path);
+
+ ret = btrfs_insert_dir_item(trans, root, "..", 2,
+ old_inode->i_ino, location,
+ BTRFS_FT_DIR);
+ if (ret)
+ goto out_fail;
+ }
+
+
+ ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
+ if (ret)
+ goto out_fail;
+
+ if (new_inode) {
+ new_inode->i_ctime = CURRENT_TIME;
+ ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
+ if (ret)
+ goto out_fail;
+ if (S_ISDIR(new_inode->i_mode))
+ clear_nlink(new_inode);
+ else
+ drop_nlink(new_inode);
+ btrfs_update_inode(trans, root, new_inode);
+ }
+ ret = btrfs_add_link(trans, new_dentry, old_inode);
+ if (ret)
+ goto out_fail;
+
+out_fail:
+ btrfs_free_path(path);
+ btrfs_end_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return ret;
+}
+
+static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
+ const char *symname)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_root *root = BTRFS_I(dir)->root;
+ struct btrfs_path *path;
+ struct btrfs_key key;
+ struct inode *inode;
+ int err;
+ int drop_inode = 0;
+ u64 objectid;
+ int name_len;
+ int datasize;
+ char *ptr;
+ struct btrfs_file_extent_item *ei;
+
+ name_len = strlen(symname) + 1;
+ if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
+ return -ENAMETOOLONG;
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, dir);
+
+ err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
+ if (err) {
+ err = -ENOSPC;
+ goto out_unlock;
+ }
+
+ inode = btrfs_new_inode(trans, root, objectid,
+ BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
+ err = PTR_ERR(inode);
+ if (IS_ERR(inode))
+ goto out_unlock;
+
+ btrfs_set_trans_block_group(trans, inode);
+ err = btrfs_add_nondir(trans, dentry, inode);
+ if (err)
+ drop_inode = 1;
+ else {
+ inode->i_mapping->a_ops = &btrfs_aops;
+ inode->i_fop = &btrfs_file_operations;
+ inode->i_op = &btrfs_file_inode_operations;
+ }
+ dir->i_sb->s_dirt = 1;
+ btrfs_update_inode_block_group(trans, inode);
+ btrfs_update_inode_block_group(trans, dir);
+ if (drop_inode)
+ goto out_unlock;
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ key.objectid = inode->i_ino;
+ key.offset = 0;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
+ datasize = btrfs_file_extent_calc_inline_size(name_len);
+ err = btrfs_insert_empty_item(trans, root, path, &key,
+ datasize);
+ BUG_ON(err);
+ 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);
+ btrfs_memcpy(root, path->nodes[0]->b_data,
+ ptr, symname, name_len);
+ mark_buffer_dirty(path->nodes[0]);
+ btrfs_free_path(path);
+ inode->i_op = &btrfs_symlink_inode_operations;
+ inode->i_mapping->a_ops = &btrfs_symlink_aops;
+ inode->i_size = name_len - 1;
+ btrfs_update_inode(trans, root, inode);
+ err = 0;
+
+out_unlock:
+ btrfs_end_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+
+ if (drop_inode) {
+ inode_dec_link_count(inode);
+ iput(inode);
+ }
+ btrfs_btree_balance_dirty(root);
+ return err;
+}
+
static struct file_system_type btrfs_fs_type = {
.owner = THIS_MODULE,
.name = "btrfs",
.lookup = btrfs_lookup,
.create = btrfs_create,
.unlink = btrfs_unlink,
+ .link = btrfs_link,
.mkdir = btrfs_mkdir,
.rmdir = btrfs_rmdir,
+ .rename = btrfs_rename,
+ .symlink = btrfs_symlink,
+ .setattr = btrfs_setattr,
};
static struct inode_operations btrfs_dir_ro_inode_operations = {
.sync_page = block_sync_page,
.prepare_write = btrfs_prepare_write,
.commit_write = btrfs_commit_write,
+ .bmap = btrfs_bmap,
+};
+
+static struct address_space_operations btrfs_symlink_aops = {
+ .readpage = btrfs_readpage,
+ .writepage = btrfs_writepage,
};
static struct inode_operations btrfs_file_inode_operations = {
.truncate = btrfs_truncate,
.getattr = btrfs_getattr,
+ .setattr = btrfs_setattr,
};
static struct file_operations btrfs_file_operations = {
.fsync = btrfs_sync_file,
};
+static struct inode_operations btrfs_symlink_inode_operations = {
+ .readlink = generic_readlink,
+ .follow_link = page_follow_link_light,
+ .put_link = page_put_link,
+};
+
static int __init init_btrfs_fs(void)
{
int err;
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;
}
{
destroy_inodecache();
unregister_filesystem(&btrfs_fs_type);
- subsystem_unregister(&btrfs_subsys);
printk("btrfs unloaded\n");
}
projects / linux-2.6-block.git / blobdiff