#include <linux/module.h>
+#include <linux/buffer_head.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
#include <linux/string.h>
#include <linux/smp_lock.h>
#include <linux/backing-dev.h>
+#include <linux/mpage.h>
+#include <linux/swap.h>
+#include <linux/writeback.h>
#include "ctree.h"
+#include "disk-io.h"
+#include "transaction.h"
+#include "btrfs_inode.h"
#define BTRFS_SUPER_MAGIC 0x9123682E
+
+static struct inode_operations btrfs_dir_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);
+ int ret;
+
+ path = btrfs_alloc_path();
+ BUG_ON(!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);
+ if (ret) {
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ make_bad_inode(inode);
+ return;
+ }
+ check_inode(inode);
+ inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
+ path->slots[0],
+ struct btrfs_inode_item);
+
+ inode->i_mode = btrfs_inode_mode(inode_item);
+ inode->i_nlink = btrfs_inode_nlink(inode_item);
+ inode->i_uid = btrfs_inode_uid(inode_item);
+ inode->i_gid = btrfs_inode_gid(inode_item);
+ inode->i_size = btrfs_inode_size(inode_item);
+ inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime);
+ inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime);
+ inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime);
+ inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime);
+ inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime);
+ inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime);
+ inode->i_blocks = btrfs_inode_nblocks(inode_item);
+ inode->i_generation = btrfs_inode_generation(inode_item);
+
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
+ inode_item = NULL;
+
+ mutex_unlock(&root->fs_info->fs_mutex);
+ check_inode(inode);
+ switch (inode->i_mode & S_IFMT) {
#if 0
-/* some random number */
+ default:
+ init_special_inode(inode, inode->i_mode,
+ btrfs_inode_rdev(inode_item));
+ break;
+#endif
+ case S_IFREG:
+ inode->i_mapping->a_ops = &btrfs_aops;
+ inode->i_fop = &btrfs_file_operations;
+ 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;
+ break;
+ case S_IFLNK:
+ // inode->i_op = &page_symlink_inode_operations;
+ break;
+ }
+ check_inode(inode);
+ return;
+}
-static struct super_operations ramfs_ops;
-static struct inode_operations ramfs_dir_inode_operations;
+static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct inode *dir,
+ struct dentry *dentry)
+{
+ struct btrfs_path *path;
+ const char *name = dentry->d_name.name;
+ int name_len = dentry->d_name.len;
+ int ret;
+ u64 objectid;
+ struct btrfs_dir_item *di;
-static struct backing_dev_info ramfs_backing_dev_info = {
- .ra_pages = 0, /* No readahead */
- .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK |
- BDI_CAP_MAP_DIRECT | BDI_CAP_MAP_COPY |
- BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP,
-};
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ btrfs_init_path(path);
+ ret = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
+ name, name_len, -1);
+ if (ret < 0)
+ goto err;
+ if (ret > 0) {
+ 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);
-struct inode *ramfs_get_inode(struct super_block *sb, int mode, dev_t dev)
-{
- struct inode * inode = new_inode(sb);
-
- if (inode) {
- inode->i_mode = mode;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
- inode->i_blocks = 0;
- inode->i_mapping->a_ops = &ramfs_aops;
- inode->i_mapping->backing_dev_info = &ramfs_backing_dev_info;
- inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
- switch (mode & S_IFMT) {
- default:
- init_special_inode(inode, mode, dev);
- break;
- case S_IFREG:
- inode->i_op = &ramfs_file_inode_operations;
- inode->i_fop = &ramfs_file_operations;
+ ret = btrfs_del_item(trans, root, path);
+ BUG_ON(ret);
+
+ btrfs_release_path(root, path);
+ ret = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
+ objectid, -1);
+ BUG_ON(ret);
+ ret = btrfs_del_item(trans, root, path);
+ BUG_ON(ret);
+ dentry->d_inode->i_ctime = dir->i_ctime;
+err:
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
+ if (ret == 0) {
+ inode_dec_link_count(dentry->d_inode);
+ dir->i_size -= name_len * 2;
+ mark_inode_dirty(dir);
+ }
+ return ret;
+}
+
+static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
+{
+ struct btrfs_root *root;
+ struct btrfs_trans_handle *trans;
+ int ret;
+
+ root = btrfs_sb(dir->i_sb);
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ ret = btrfs_unlink_trans(trans, root, dir, dentry);
+ btrfs_end_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return ret;
+}
+
+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_path *path;
+ struct btrfs_key key;
+ struct btrfs_trans_handle *trans;
+ struct btrfs_key found_key;
+ int found_type;
+ struct btrfs_leaf *leaf;
+ char *goodnames = "..";
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ btrfs_init_path(path);
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ key.objectid = inode->i_ino;
+ key.offset = (u64)-1;
+ key.flags = (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);
+
+ if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1)
break;
- case S_IFDIR:
- inode->i_op = &ramfs_dir_inode_operations;
- inode->i_fop = &simple_dir_operations;
+ btrfs_release_path(root, path);
+ }
+ ret = 0;
+ btrfs_release_path(root, path);
+
+ /* now the directory is empty */
+ err = btrfs_unlink_trans(trans, root, dir, dentry);
+ if (!err) {
+ inode->i_size = 0;
+ }
+out:
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ ret = btrfs_end_transaction(trans, root);
+ if (ret && !err)
+ err = ret;
+ return err;
+}
+
+static int btrfs_free_inode(struct btrfs_trans_handle *trans,
+ 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;
- /* directory inodes start off with i_nlink == 2 (for "." entry) */
- inc_nlink(inode);
+ 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);
+ 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;
+}
+
+static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct inode *inode)
+{
+ int ret;
+ struct btrfs_path *path;
+ struct btrfs_key key;
+ struct btrfs_disk_key *found_key;
+ struct btrfs_leaf *leaf;
+ struct btrfs_file_extent_item *fi = NULL;
+ u64 extent_start = 0;
+ u64 extent_num_blocks = 0;
+ int found_extent;
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ /* FIXME, add redo link to tree so we don't leak on crash */
+ key.objectid = inode->i_ino;
+ key.offset = (u64)-1;
+ key.flags = 0;
+ /*
+ * use BTRFS_CSUM_ITEM_KEY because it is larger than inline keys
+ * or extent data
+ */
+ btrfs_set_key_type(&key, BTRFS_CSUM_ITEM_KEY);
+ while(1) {
+ btrfs_init_path(path);
+ ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
+ if (ret < 0) {
+ goto error;
+ }
+ if (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)
break;
- case S_IFLNK:
- inode->i_op = &page_symlink_inode_operations;
+ 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;
+ if (btrfs_disk_key_type(found_key) == BTRFS_EXTENT_DATA_KEY) {
+ fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
+ path->slots[0],
+ struct btrfs_file_extent_item);
+ extent_start = btrfs_file_extent_disk_blocknr(fi);
+ extent_num_blocks =
+ btrfs_file_extent_disk_num_blocks(fi);
+ inode->i_blocks -=
+ btrfs_file_extent_num_blocks(fi) >> 9;
+ found_extent = 1;
+ } else {
+ found_extent = 0;
+ }
+ ret = btrfs_del_item(trans, root, path);
+ BUG_ON(ret);
+ btrfs_release_path(root, path);
+ if (found_extent) {
+ ret = btrfs_free_extent(trans, root, extent_start,
+ extent_num_blocks, 0);
+ BUG_ON(ret);
}
}
- return inode;
+ ret = 0;
+error:
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
+ return ret;
}
-/*
- * File creation. Allocate an inode, and we're done..
- */
-/* SMP-safe */
-static int
-ramfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
+static void btrfs_delete_inode(struct inode *inode)
{
- struct inode * inode = ramfs_get_inode(dir->i_sb, mode, dev);
- int error = -ENOSPC;
+ struct btrfs_trans_handle *trans;
+ struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ int ret;
- if (inode) {
- if (dir->i_mode & S_ISGID) {
- inode->i_gid = dir->i_gid;
- if (S_ISDIR(mode))
- inode->i_mode |= S_ISGID;
- }
- d_instantiate(dentry, inode);
- dget(dentry); /* Extra count - pin the dentry in core */
- error = 0;
- dir->i_mtime = dir->i_ctime = CURRENT_TIME;
+ truncate_inode_pages(&inode->i_data, 0);
+ if (is_bad_inode(inode)) {
+ goto no_delete;
}
- return error;
+ 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_free_inode(trans, root, inode);
+ btrfs_end_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return;
+no_delete:
+ clear_inode(inode);
}
-static int ramfs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
+static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
+ ino_t *ino)
{
- int retval = ramfs_mknod(dir, dentry, mode | S_IFDIR, 0);
- if (!retval)
- inc_nlink(dir);
- return retval;
+ 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);
+ 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,
+ namelen, 0);
+ if (ret || !btrfs_match_dir_item_name(root, path, name, namelen)) {
+ *ino = 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);
+out:
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
+ check_inode(dir);
+ return ret;
}
-static int ramfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
+static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
+ struct nameidata *nd)
{
- return ramfs_mknod(dir, dentry, mode | S_IFREG, 0);
+ struct inode * inode;
+ struct btrfs_root *root = btrfs_sb(dir->i_sb);
+ ino_t ino;
+ 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);
+ 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 (!inode)
+ return ERR_PTR(-EACCES);
+ check_inode(inode);
+ }
+ check_inode(dir);
+ return d_splice_alias(inode, dentry);
}
-static int ramfs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
+static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
- struct inode *inode;
- int error = -ENOSPC;
-
- inode = ramfs_get_inode(dir->i_sb, S_IFLNK|S_IRWXUGO, 0);
- if (inode) {
- int l = strlen(symname)+1;
- error = page_symlink(inode, symname, l);
- if (!error) {
- if (dir->i_mode & S_ISGID)
- inode->i_gid = dir->i_gid;
- d_instantiate(dentry, inode);
- dget(dentry);
- dir->i_mtime = dir->i_ctime = CURRENT_TIME;
- } else
- iput(inode);
- }
- return error;
-}
-
-static struct inode_operations ramfs_dir_inode_operations = {
- .create = ramfs_create,
- .lookup = simple_lookup,
- .link = simple_link,
- .unlink = simple_unlink,
- .symlink = ramfs_symlink,
- .mkdir = ramfs_mkdir,
- .rmdir = simple_rmdir,
- .mknod = ramfs_mknod,
- .rename = simple_rename,
-};
-#endif
+ struct inode *inode = filp->f_path.dentry->d_inode;
+ struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_item *item;
+ struct btrfs_dir_item *di;
+ struct btrfs_key key;
+ struct btrfs_path *path;
+ int ret;
+ u32 nritems;
+ struct btrfs_leaf *leaf;
+ int slot;
+ int advance;
+ unsigned char d_type = DT_UNKNOWN;
+ int over = 0;
-struct inode *btrfs_get_inode(struct super_block *sb, int mode, dev_t dev)
-{
- struct inode * inode = new_inode(sb);
+ mutex_lock(&root->fs_info->fs_mutex);
+ key.objectid = inode->i_ino;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
+ 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) {
+ goto err;
+ }
+ advance = 0;
+ 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) {
+ ret = btrfs_next_leaf(root, path);
+ if (ret)
+ break;
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
+ nritems = btrfs_header_nritems(&leaf->header);
+ slot = path->slots[0];
+ } else {
+ slot++;
+ path->slots[0]++;
+ }
+ }
+ advance = 1;
+ item = leaf->items + slot;
+ if (btrfs_disk_key_objectid(&item->key) != key.objectid)
+ break;
+ if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_INDEX_KEY)
+ continue;
+ if (btrfs_disk_key_offset(&item->key) < filp->f_pos)
+ continue;
- if (inode) {
- inode->i_mode = mode;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
- inode->i_blocks = 0;
- inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+ advance = 1;
+ di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
+ over = filldir(dirent, (const char *)(di + 1),
+ btrfs_dir_name_len(di),
+ btrfs_disk_key_offset(&item->key),
+ btrfs_dir_objectid(di), d_type);
+ if (over) {
+ filp->f_pos = btrfs_disk_key_offset(&item->key);
+ break;
+ }
+ filp->f_pos = btrfs_disk_key_offset(&item->key) + 1;
}
- return inode;
+ ret = 0;
+err:
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return ret;
}
-static struct super_operations btrfs_ops = {
- .statfs = simple_statfs,
- .drop_inode = generic_delete_inode,
-};
+static void btrfs_put_super (struct super_block * sb)
+{
+ struct btrfs_root *root = btrfs_sb(sb);
+ int ret;
+
+ ret = close_ctree(root);
+ if (ret) {
+ printk("close ctree returns %d\n", ret);
+ }
+ sb->s_fs_info = NULL;
+}
static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
{
struct inode * inode;
- struct dentry * root;
+ struct dentry * root_dentry;
+ struct btrfs_super_block *disk_super;
+ struct btrfs_root *root;
sb->s_maxbytes = MAX_LFS_FILESIZE;
- sb->s_blocksize = PAGE_CACHE_SIZE;
- sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
sb->s_magic = BTRFS_SUPER_MAGIC;
- sb->s_op = &btrfs_ops;
+ sb->s_op = &btrfs_super_ops;
sb->s_time_gran = 1;
- inode = btrfs_get_inode(sb, S_IFDIR | 0755, 0);
+
+ root = open_ctree(sb);
+
+ if (!root) {
+ printk("btrfs: open_ctree failed\n");
+ return -EIO;
+ }
+ sb->s_fs_info = root;
+ disk_super = 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));
if (!inode)
return -ENOMEM;
+ if (inode->i_state & I_NEW) {
+ btrfs_read_locked_inode(inode);
+ unlock_new_inode(inode);
+ }
- root = d_alloc_root(inode);
- if (!root) {
+ root_dentry = d_alloc_root(inode);
+ if (!root_dentry) {
iput(inode);
return -ENOMEM;
}
- sb->s_root = root;
+ sb->s_root = root_dentry;
+
+ return 0;
+}
+
+static void fill_inode_item(struct btrfs_inode_item *item,
+ struct inode *inode)
+{
+ btrfs_set_inode_uid(item, inode->i_uid);
+ btrfs_set_inode_gid(item, inode->i_gid);
+ btrfs_set_inode_size(item, inode->i_size);
+ btrfs_set_inode_mode(item, inode->i_mode);
+ btrfs_set_inode_nlink(item, inode->i_nlink);
+ btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec);
+ btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec);
+ btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec);
+ btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec);
+ btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec);
+ 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,
+ struct btrfs_root *root,
+ struct inode *inode)
+{
+ struct btrfs_inode_item *inode_item;
+ struct btrfs_path *path;
+ int ret;
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ btrfs_init_path(path);
+
+ ret = btrfs_lookup_inode(trans, root, path, inode->i_ino, 1);
+ if (ret) {
+ if (ret > 0)
+ ret = -ENOENT;
+ goto failed;
+ }
+
+ inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
+ path->slots[0],
+ struct btrfs_inode_item);
+
+ fill_inode_item(inode_item, inode);
+ btrfs_mark_buffer_dirty(path->nodes[0]);
+failed:
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
+ check_inode(inode);
+ return 0;
+}
+
+static int btrfs_write_inode(struct inode *inode, int wait)
+{
+ struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ 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);
+ 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 inode *inode;
+ struct btrfs_inode_item inode_item;
+ struct btrfs_root *root = btrfs_sb(dir->i_sb);
+ struct btrfs_key key;
+ int ret;
+ u64 objectid;
+
+ inode = new_inode(dir->i_sb);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+
+ check_inode(inode);
+ ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
+ BUG_ON(ret);
+
+ 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;
+ 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);
+
+ ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
+ BUG_ON(ret);
+
+ insert_inode_hash(inode);
+ check_inode(inode);
+ check_inode(dir);
+ return inode;
+}
+
+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),
+ dentry->d_name.name, dentry->d_name.len,
+ dentry->d_parent->d_inode->i_ino,
+ inode->i_ino, 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),
+ dentry->d_parent->d_inode);
+ }
+ check_inode(inode);
+ check_inode(dentry->d_parent->d_inode);
+ return ret;
+}
+
+static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
+ struct dentry *dentry, struct inode *inode)
+{
+ int err = btrfs_add_link(trans, dentry, inode);
+ if (!err) {
+ d_instantiate(dentry, inode);
+ return 0;
+ }
+ if (err > 0)
+ err = -EEXIST;
+ check_inode(inode);
+ return err;
+}
+
+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 inode *inode;
+ int err;
+ int drop_inode = 0;
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ inode = btrfs_new_inode(trans, dir, mode);
+ err = PTR_ERR(inode);
+ if (IS_ERR(inode))
+ goto out_unlock;
+ // FIXME mark the inode dirty
+ 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;
+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);
+ iput(inode);
+ }
+ return err;
+}
+
+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);
+ int ret;
+ char buf[2];
+ buf[0] = '.';
+ buf[1] = '.';
+
+ ret = btrfs_insert_dir_item(trans, root, buf, 1, inode->i_ino,
+ inode->i_ino, 1);
+ if (ret)
+ goto error;
+ ret = btrfs_insert_dir_item(trans, root, buf, 2, inode->i_ino,
+ dir->i_ino, 1);
+ if (ret)
+ goto error;
+ inode->i_size = 6;
+ ret = btrfs_update_inode(trans, root, inode);
+error:
+ return ret;
+}
+
+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);
+ int err = 0;
+ int drop_on_err = 0;
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ if (IS_ERR(trans)) {
+ err = PTR_ERR(trans);
+ goto out_unlock;
+ }
+ inode = btrfs_new_inode(trans, dir, 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;
+
+ err = btrfs_make_empty_dir(trans, inode, dir);
+ if (err)
+ goto out_fail;
+ err = btrfs_add_link(trans, dentry, inode);
+ if (err)
+ goto out_fail;
+ d_instantiate(dentry, inode);
+ drop_on_err = 0;
+
+out_fail:
+ btrfs_end_transaction(trans, root);
+out_unlock:
+ mutex_unlock(&root->fs_info->fs_mutex);
+ if (drop_on_err)
+ iput(inode);
+ return err;
+}
+
+static int btrfs_sync_fs(struct super_block *sb, int wait)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_root *root;
+ int ret;
+ root = btrfs_sb(sb);
+
+ sb->s_dirt = 0;
+ if (!wait) {
+ 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);
+ sb->s_dirt = 0;
+ BUG_ON(ret);
+printk("btrfs sync_fs\n");
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return 0;
+}
+
+#if 0
+static int btrfs_get_block_inline(struct inode *inode, sector_t iblock,
+ struct buffer_head *result, int create)
+{
+ struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_path *path;
+ struct btrfs_key key;
+ struct btrfs_leaf *leaf;
+ int num_bytes = result->b_size;
+ int item_size;
+ int ret;
+ u64 pos;
+ char *ptr;
+ int copy_size;
+ int err = 0;
+ char *safe_ptr;
+ char *data_ptr;
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+
+ WARN_ON(create);
+ if (create) {
+ return 0;
+ }
+ pos = iblock << inode->i_blkbits;
+ key.objectid = inode->i_ino;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_INLINE_DATA_KEY);
+ ptr = kmap(result->b_page);
+ safe_ptr = ptr;
+ ptr += (pos & (PAGE_CACHE_SIZE -1));
+again:
+ key.offset = pos;
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ if (ret) {
+ if (ret < 0)
+ err = ret;
+ else
+ err = 0;
+ goto out;
+ }
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
+ item_size = btrfs_item_size(leaf->items + path->slots[0]);
+ copy_size = min(num_bytes, item_size);
+ data_ptr = btrfs_item_ptr(leaf, path->slots[0], char);
+ WARN_ON(safe_ptr + PAGE_CACHE_SIZE < ptr + copy_size);
+ memcpy(ptr, data_ptr, copy_size);
+ pos += copy_size;
+ num_bytes -= copy_size;
+ WARN_ON(num_bytes < 0);
+ ptr += copy_size;
+ btrfs_release_path(root, path);
+ if (num_bytes != 0) {
+ if (pos >= i_size_read(inode))
+ memset(ptr, 0, num_bytes);
+ else
+ goto again;
+ }
+ set_buffer_uptodate(result);
+ map_bh(result, inode->i_sb, 0);
+ err = 0;
+out:
+ btrfs_free_path(path);
+ kunmap(result->b_page);
+ return err;
+}
+#endif
+
+static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
+ struct buffer_head *result, int create)
+{
+ int ret;
+ int err = 0;
+ u64 blocknr;
+ u64 extent_start = 0;
+ u64 extent_end = 0;
+ u64 objectid = inode->i_ino;
+ struct btrfs_path *path;
+ struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_trans_handle *trans = NULL;
+ 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);
+
+ ret = btrfs_lookup_file_extent(trans, root, path,
+ inode->i_ino,
+ iblock << inode->i_blkbits, 0);
+ if (ret < 0) {
+ err = ret;
+ goto out;
+ }
+
+ if (ret != 0) {
+ if (path->slots[0] == 0) {
+ btrfs_release_path(root, path);
+ goto allocate;
+ }
+ path->slots[0]--;
+ }
+
+ item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
+ struct btrfs_file_extent_item);
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
+ 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;
+ if (btrfs_disk_key_objectid(found_key) != objectid ||
+ btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) {
+ extent_end = 0;
+ extent_start = 0;
+ btrfs_release_path(root, path);
+ 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;
+ }
+ 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;
+}
+
+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);
+ mutex_lock(&root->fs_info->fs_mutex);
+ err = btrfs_get_block_lock(inode, iblock, result, create);
+ // err = btrfs_get_block_inline(inode, iblock, result, create);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return err;
+}
+
+static int btrfs_prepare_write(struct file *file, struct page *page,
+ unsigned from, unsigned to)
+{
+ 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)
+{
+ return nobh_commit_write(file, page, from, to);
+}
+
+static void btrfs_write_super(struct super_block *sb)
+{
+ btrfs_sync_fs(sb, 1);
+}
+
+static int btrfs_readpage(struct file *file, struct page *page)
+{
+ 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)
+{
+ return mpage_readpages(mapping, pages, nr_pages, btrfs_get_block);
+}
+
+static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
+{
+ return nobh_writepage(page, btrfs_get_block, wbc);
+}
+
+static void btrfs_truncate(struct inode *inode)
+{
+ struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ int ret;
+ struct btrfs_trans_handle *trans;
+
+ if (!S_ISREG(inode->i_mode))
+ return;
+ if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
+ return;
+
+ nobh_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);
+ ret = btrfs_truncate_in_trans(trans, root, inode);
+ BUG_ON(ret);
+ ret = btrfs_end_transaction(trans, root);
+ BUG_ON(ret);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ mark_inode_dirty(inode);
+}
+
+static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes,
+ struct page **prepared_pages,
+ const char __user * buf)
+{
+ long page_fault = 0;
+ int i;
+ int offset = pos & (PAGE_CACHE_SIZE - 1);
+
+ for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) {
+ size_t count = min_t(size_t,
+ PAGE_CACHE_SIZE - offset, write_bytes);
+ struct page *page = prepared_pages[i];
+ fault_in_pages_readable(buf, count);
+
+ /* Copy data from userspace to the current page */
+ kmap(page);
+ page_fault = __copy_from_user(page_address(page) + offset,
+ buf, count);
+ /* Flush processor's dcache for this page */
+ flush_dcache_page(page);
+ kunmap(page);
+ buf += count;
+ write_bytes -= count;
+
+ if (page_fault)
+ break;
+ }
+ return page_fault ? -EFAULT : 0;
+}
+
+static void btrfs_drop_pages(struct page **pages, size_t num_pages)
+{
+ size_t i;
+ for (i = 0; i < num_pages; i++) {
+ if (!pages[i])
+ break;
+ unlock_page(pages[i]);
+ mark_page_accessed(pages[i]);
+ page_cache_release(pages[i]);
+ }
+}
+static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct file *file,
+ struct page **pages,
+ size_t num_pages,
+ loff_t pos,
+ size_t write_bytes)
+{
+ int i;
+ int offset;
+ int err = 0;
+ int ret;
+ int this_write;
+ struct inode *inode = file->f_path.dentry->d_inode;
+
+ for (i = 0; i < num_pages; i++) {
+ offset = pos & (PAGE_CACHE_SIZE -1);
+ this_write = min(PAGE_CACHE_SIZE - offset, write_bytes);
+ /* FIXME, one block at a time */
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_csum_file_block(trans, root, inode->i_ino,
+ pages[i]->index << PAGE_CACHE_SHIFT,
+ kmap(pages[i]), PAGE_CACHE_SIZE);
+ kunmap(pages[i]);
+ SetPageChecked(pages[i]);
+ ret = btrfs_end_transaction(trans, root);
+ BUG_ON(ret);
+ mutex_unlock(&root->fs_info->fs_mutex);
+
+ ret = nobh_commit_write(file, pages[i], offset,
+ offset + this_write);
+ pos += this_write;
+ if (ret) {
+ err = ret;
+ goto failed;
+ }
+ WARN_ON(this_write > write_bytes);
+ write_bytes -= this_write;
+ }
+failed:
+ return err;
+}
+
+static int prepare_pages(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct file *file,
+ struct page **pages,
+ size_t num_pages,
+ loff_t pos,
+ size_t write_bytes)
+{
+ 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;
+ loff_t isize = i_size_read(inode);
+
+ memset(pages, 0, num_pages * sizeof(struct page *));
+
+ for (i = 0; i < num_pages; i++) {
+ pages[i] = grab_cache_page(inode->i_mapping, index + i);
+ if (!pages[i]) {
+ err = -ENOMEM;
+ goto failed_release;
+ }
+ 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);
+ pos += this_write;
+ if (ret) {
+ err = ret;
+ goto failed_truncate;
+ }
+ WARN_ON(this_write > write_bytes);
+ write_bytes -= this_write;
+ }
+ return 0;
+
+failed_release:
+ btrfs_drop_pages(pages, num_pages);
+ return err;
+
+failed_truncate:
+ btrfs_drop_pages(pages, num_pages);
+ if (pos > isize)
+ vmtruncate(inode, isize);
+ return err;
+}
+
+static ssize_t btrfs_file_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);
+ struct page *pages[1];
+
+ 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);
+ 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);
+
+ buf += write_bytes;
+ count -= write_bytes;
+ pos += write_bytes;
+ num_written += write_bytes;
+
+ balance_dirty_pages_ratelimited(inode->i_mapping);
+ cond_resched();
+ }
+ mutex_unlock(&inode->i_mutex);
+out:
+ *ppos = pos;
+ current->backing_dev_info = NULL;
+ return num_written ? num_written : err;
+}
+
+#if 0
+static ssize_t inline_one_page(struct btrfs_root *root, struct inode *inode,
+ struct page *page, loff_t pos,
+ size_t offset, size_t write_bytes)
+{
+ struct btrfs_path *path;
+ struct btrfs_trans_handle *trans;
+ struct btrfs_key key;
+ struct btrfs_leaf *leaf;
+ struct btrfs_key found_key;
+ int ret;
+ size_t copy_size = 0;
+ char *dst = NULL;
+ int err = 0;
+ size_t num_written = 0;
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ key.objectid = inode->i_ino;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_INLINE_DATA_KEY);
+
+again:
+ key.offset = pos;
+ ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
+ if (ret < 0) {
+ err = ret;
+ goto out;
+ }
+ if (ret == 0) {
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
+ btrfs_disk_key_to_cpu(&found_key,
+ &leaf->items[path->slots[0]].key);
+ copy_size = btrfs_item_size(leaf->items + path->slots[0]);
+ dst = btrfs_item_ptr(leaf, path->slots[0], char);
+ copy_size = min(write_bytes, copy_size);
+ goto copyit;
+ } else {
+ int slot = path->slots[0];
+ if (slot > 0) {
+ slot--;
+ }
+ // FIXME find max key
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
+ btrfs_disk_key_to_cpu(&found_key,
+ &leaf->items[slot].key);
+ if (found_key.objectid != inode->i_ino)
+ goto insert;
+ if (btrfs_key_type(&found_key) != BTRFS_INLINE_DATA_KEY)
+ goto insert;
+ copy_size = btrfs_item_size(leaf->items + slot);
+ if (found_key.offset + copy_size <= pos)
+ goto insert;
+ dst = btrfs_item_ptr(leaf, path->slots[0], char);
+ dst += pos - found_key.offset;
+ copy_size = copy_size - (pos - found_key.offset);
+ BUG_ON(copy_size < 0);
+ copy_size = min(write_bytes, copy_size);
+ WARN_ON(copy_size == 0);
+ goto copyit;
+ }
+insert:
+ btrfs_release_path(root, path);
+ copy_size = min(write_bytes,
+ (size_t)BTRFS_LEAF_DATA_SIZE(root) -
+ sizeof(struct btrfs_item) * 4);
+ ret = btrfs_insert_empty_item(trans, root, path, &key, copy_size);
+ BUG_ON(ret);
+ dst = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
+ path->slots[0], char);
+copyit:
+ WARN_ON(copy_size == 0);
+ WARN_ON(dst + copy_size >
+ btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
+ path->slots[0], char) +
+ btrfs_item_size(btrfs_buffer_leaf(path->nodes[0])->items +
+ path->slots[0]));
+ btrfs_memcpy(root, path->nodes[0]->b_data, dst,
+ page_address(page) + offset, copy_size);
+ mark_buffer_dirty(path->nodes[0]);
+ btrfs_release_path(root, path);
+ pos += copy_size;
+ offset += copy_size;
+ num_written += copy_size;
+ write_bytes -= copy_size;
+ if (write_bytes)
+ goto again;
+out:
+ btrfs_free_path(path);
+ ret = btrfs_end_transaction(trans, root);
+ BUG_ON(ret);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return num_written ? num_written : err;
+}
+
+static ssize_t btrfs_file_inline_write(struct file *file,
+ const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ loff_t pos;
+ size_t num_written = 0;
+ int err = 0;
+ int ret = 0;
+ struct inode *inode = file->f_path.dentry->d_inode;
+ struct btrfs_root *root = btrfs_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;
+
+ page_index = pos >> PAGE_CACHE_SHIFT;
+ page = grab_cache_page(inode->i_mapping, page_index);
+ if (!PageUptodate(page)) {
+ ret = mpage_readpage(page, btrfs_get_block);
+ BUG_ON(ret);
+ lock_page(page);
+ }
+ ret = btrfs_copy_from_user(pos, 1,
+ write_bytes, &page, buf);
+ BUG_ON(ret);
+ write_bytes = inline_one_page(root, inode, page, pos,
+ offset, write_bytes);
+ SetPageUptodate(page);
+ if (write_bytes > 0 && pos + write_bytes > inode->i_size) {
+ i_size_write(inode, pos + write_bytes);
+ mark_inode_dirty(inode);
+ }
+ page_cache_release(page);
+ unlock_page(page);
+ if (write_bytes < 0)
+ goto out_unlock;
+ buf += write_bytes;
+ count -= write_bytes;
+ pos += write_bytes;
+ num_written += write_bytes;
+
+ balance_dirty_pages_ratelimited(inode->i_mapping);
+ cond_resched();
+ }
+out_unlock:
+ mutex_unlock(&inode->i_mutex);
+out:
+ *ppos = pos;
+ current->backing_dev_info = NULL;
+ return num_written ? num_written : err;
+}
+#endif
+
+static int btrfs_read_actor(read_descriptor_t *desc, struct page *page,
+ unsigned long offset, unsigned long size)
+{
+ char *kaddr;
+ unsigned long left, count = desc->count;
+
+ if (size > count)
+ size = count;
+
+ if (!PageChecked(page)) {
+ /* FIXME, do it per block */
+ struct btrfs_root *root = btrfs_sb(page->mapping->host->i_sb);
+ int ret = btrfs_csum_verify_file_block(root,
+ page->mapping->host->i_ino,
+ page->index << PAGE_CACHE_SHIFT,
+ kmap(page), PAGE_CACHE_SIZE);
+ if (ret) {
+ printk("failed to verify ino %lu page %lu\n",
+ page->mapping->host->i_ino,
+ page->index);
+ memset(page_address(page), 0, PAGE_CACHE_SIZE);
+ }
+ SetPageChecked(page);
+ kunmap(page);
+ }
+ /*
+ * Faults on the destination of a read are common, so do it before
+ * taking the kmap.
+ */
+ if (!fault_in_pages_writeable(desc->arg.buf, size)) {
+ kaddr = kmap_atomic(page, KM_USER0);
+ left = __copy_to_user_inatomic(desc->arg.buf,
+ kaddr + offset, size);
+ kunmap_atomic(kaddr, KM_USER0);
+ if (left == 0)
+ goto success;
+ }
+
+ /* Do it the slow way */
+ kaddr = kmap(page);
+ left = __copy_to_user(desc->arg.buf, kaddr + offset, size);
+ kunmap(page);
+
+ if (left) {
+ size -= left;
+ desc->error = -EFAULT;
+ }
+success:
+ desc->count = count - size;
+ desc->written += size;
+ desc->arg.buf += size;
+ return size;
+}
+
+/**
+ * btrfs_file_aio_read - filesystem read routine
+ * @iocb: kernel I/O control block
+ * @iov: io vector request
+ * @nr_segs: number of segments in the iovec
+ * @pos: current file position
+ */
+static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos)
+{
+ struct file *filp = iocb->ki_filp;
+ ssize_t retval;
+ unsigned long seg;
+ size_t count;
+ loff_t *ppos = &iocb->ki_pos;
+
+ count = 0;
+ for (seg = 0; seg < nr_segs; seg++) {
+ const struct iovec *iv = &iov[seg];
+
+ /*
+ * If any segment has a negative length, or the cumulative
+ * length ever wraps negative then return -EINVAL.
+ */
+ count += iv->iov_len;
+ if (unlikely((ssize_t)(count|iv->iov_len) < 0))
+ return -EINVAL;
+ if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len))
+ continue;
+ if (seg == 0)
+ return -EFAULT;
+ nr_segs = seg;
+ count -= iv->iov_len; /* This segment is no good */
+ break;
+ }
+ retval = 0;
+ if (count) {
+ for (seg = 0; seg < nr_segs; seg++) {
+ read_descriptor_t desc;
+
+ desc.written = 0;
+ desc.arg.buf = iov[seg].iov_base;
+ desc.count = iov[seg].iov_len;
+ if (desc.count == 0)
+ continue;
+ desc.error = 0;
+ do_generic_file_read(filp, ppos, &desc,
+ btrfs_read_actor);
+ retval += desc.written;
+ if (desc.error) {
+ retval = retval ?: desc.error;
+ break;
+ }
+ }
+ }
+ return retval;
+}
+
+static struct kmem_cache *btrfs_inode_cachep;
+struct kmem_cache *btrfs_trans_handle_cachep;
+struct kmem_cache *btrfs_transaction_cachep;
+struct kmem_cache *btrfs_bit_radix_cachep;
+struct kmem_cache *btrfs_path_cachep;
+
+/*
+ * Called inside transaction, so use GFP_NOFS
+ */
+static struct inode *btrfs_alloc_inode(struct super_block *sb)
+{
+ struct btrfs_inode *ei;
+
+ ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
+ if (!ei)
+ return NULL;
+ 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));
+}
+
+static void init_once(void * foo, struct kmem_cache * cachep,
+ unsigned long flags)
+{
+ struct btrfs_inode *ei = (struct btrfs_inode *) foo;
+
+ if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+ SLAB_CTOR_CONSTRUCTOR) {
+ inode_init_once(&ei->vfs_inode);
+ }
+}
+
+static int init_inodecache(void)
+{
+ btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache",
+ sizeof(struct btrfs_inode),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ init_once, NULL);
+ btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache",
+ sizeof(struct btrfs_trans_handle),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ NULL, NULL);
+ btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache",
+ sizeof(struct btrfs_transaction),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ NULL, NULL);
+ btrfs_path_cachep = kmem_cache_create("btrfs_path_cache",
+ sizeof(struct btrfs_transaction),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ NULL, NULL);
+ btrfs_bit_radix_cachep = kmem_cache_create("btrfs_radix",
+ 256,
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD |
+ SLAB_DESTROY_BY_RCU),
+ NULL, NULL);
+ if (btrfs_inode_cachep == NULL || btrfs_trans_handle_cachep == NULL ||
+ btrfs_transaction_cachep == NULL || btrfs_bit_radix_cachep == NULL)
+ return -ENOMEM;
return 0;
}
+static void destroy_inodecache(void)
+{
+ kmem_cache_destroy(btrfs_inode_cachep);
+ kmem_cache_destroy(btrfs_trans_handle_cachep);
+ kmem_cache_destroy(btrfs_transaction_cachep);
+ kmem_cache_destroy(btrfs_bit_radix_cachep);
+ kmem_cache_destroy(btrfs_path_cachep);
+}
+
static int btrfs_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
.fs_flags = FS_REQUIRES_DEV,
};
+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,
+ .alloc_inode = btrfs_alloc_inode,
+ .destroy_inode = btrfs_destroy_inode,
+};
+
+static struct inode_operations btrfs_dir_inode_operations = {
+ .lookup = btrfs_lookup,
+ .create = btrfs_create,
+ .unlink = btrfs_unlink,
+ .mkdir = btrfs_mkdir,
+ .rmdir = btrfs_rmdir,
+};
+
+static struct file_operations btrfs_dir_file_operations = {
+ .llseek = generic_file_llseek,
+ .read = generic_read_dir,
+ .readdir = btrfs_readdir,
+};
+
+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,
+ .commit_write = btrfs_commit_write,
+};
+
+static struct inode_operations btrfs_file_inode_operations = {
+ .truncate = btrfs_truncate,
+};
+
+static struct file_operations btrfs_file_operations = {
+ .llseek = generic_file_llseek,
+ .read = do_sync_read,
+ .aio_read = btrfs_file_aio_read,
+ .write = btrfs_file_write,
+ .mmap = generic_file_mmap,
+ .open = generic_file_open,
+};
+
static int __init init_btrfs_fs(void)
{
+ int err;
printk("btrfs loaded!\n");
+ err = init_inodecache();
+ if (err)
+ return err;
return register_filesystem(&btrfs_fs_type);
}
static void __exit exit_btrfs_fs(void)
{
+ destroy_inodecache();
unregister_filesystem(&btrfs_fs_type);
printk("btrfs unloaded\n");
}
projects / deliverable / linux.git / blobdiff