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Btrfs: Set the btree inode i_size to OFFSET_MAX

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-04-18 14:17:20 -04:00
parent a40a90a042
commit 0afbaf8c82
1 changed files with 26 additions and 7 deletions
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33
fs/btrfs/disk-io.c
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@ -88,19 +88,35 @@ struct extent_map *btree_get_extent(struct inode *inode, struct page *page,
goto out; goto out;
} }
em->start = 0; em->start = 0;
em->len = i_size_read(inode); em->len = (u64)-1;
em->block_start = 0; em->block_start = 0;
em->bdev = inode->i_sb->s_bdev; em->bdev = inode->i_sb->s_bdev;
spin_lock(&em_tree->lock); spin_lock(&em_tree->lock);
ret = add_extent_mapping(em_tree, em); ret = add_extent_mapping(em_tree, em);
if (ret == -EEXIST) { if (ret == -EEXIST) {
u64 failed_start = em->start;
u64 failed_len = em->len;
printk("failed to insert %Lu %Lu -> %Lu into tree\n",
em->start, em->len, em->block_start);
free_extent_map(em); free_extent_map(em);
em = lookup_extent_mapping(em_tree, start, len); em = lookup_extent_mapping(em_tree, start, len);
if (em) if (em) {
printk("after failing, found %Lu %Lu %Lu\n",
em->start, em->len, em->block_start);
ret = 0; ret = 0;
else } else {
em = lookup_extent_mapping(em_tree, failed_start,
failed_len);
if (em) {
printk("double failure lookup gives us "
"%Lu %Lu -> %Lu\n", em->start,
em->len, em->block_start);
free_extent_map(em);
}
ret = -EIO; ret = -EIO;
}
} else if (ret) { } else if (ret) {
free_extent_map(em); free_extent_map(em);
em = NULL; em = NULL;
@ -1108,7 +1124,13 @@ struct btrfs_root *open_ctree(struct super_block *sb,
fs_info->btree_inode = new_inode(sb); fs_info->btree_inode = new_inode(sb);
fs_info->btree_inode->i_ino = 1; fs_info->btree_inode->i_ino = 1;
fs_info->btree_inode->i_nlink = 1; fs_info->btree_inode->i_nlink = 1;
fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size;
/*
* we set the i_size on the btree inode to the max possible int.
* the real end of the address space is determined by all of
* the devices in the system
*/
fs_info->btree_inode->i_size = OFFSET_MAX;
fs_info->btree_inode->i_mapping->a_ops = &btree_aops; fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi; fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi;
@ -1196,9 +1218,6 @@ struct btrfs_root *open_ctree(struct super_block *sb,
tree_root->stripesize = stripesize; tree_root->stripesize = stripesize;
sb_set_blocksize(sb, sectorsize); sb_set_blocksize(sb, sectorsize);
i_size_write(fs_info->btree_inode,
btrfs_super_total_bytes(disk_super));
if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC, if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
sizeof(disk_super->magic))) { sizeof(disk_super->magic))) {
printk("btrfs: valid FS not found on %s\n", sb->s_id); printk("btrfs: valid FS not found on %s\n", sb->s_id);