inode.c 75.5 KB
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/*
 * Copyright (C) 2007 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

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#include <linux/buffer_head.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
#include <linux/time.h>
#include <linux/init.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 <linux/statfs.h>
#include <linux/compat.h>
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#include <linux/bit_spinlock.h>
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#include <linux/version.h>
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#include <linux/xattr.h>
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#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
#include "btrfs_inode.h"
#include "ioctl.h"
#include "print-tree.h"

struct btrfs_iget_args {
	u64 ino;
	struct btrfs_root *root;
};

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;
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static struct inode_operations btrfs_special_inode_operations;
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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_dir_file_operations;
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static struct extent_io_ops btrfs_extent_io_ops;
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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;

#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,
};

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int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
			   int for_del)
{
	u64 total = btrfs_super_total_bytes(&root->fs_info->super_copy);
	u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy);
	u64 thresh;
	int ret = 0;

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	return 0;

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	if (for_del)
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		thresh = total * 90;
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	else
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		thresh = total * 85;

	do_div(thresh, 100);
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	spin_lock(&root->fs_info->delalloc_lock);
	if (used + root->fs_info->delalloc_bytes + num_required > thresh)
		ret = -ENOSPC;
	spin_unlock(&root->fs_info->delalloc_lock);
	return ret;
}

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static int cow_file_range(struct inode *inode, u64 start, u64 end)
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{
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_trans_handle *trans;
	u64 alloc_hint = 0;
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	u64 num_bytes;
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	u64 cur_alloc_size;
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	u64 blocksize = root->sectorsize;
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	u64 orig_start = start;
	u64 orig_num_bytes;
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	struct btrfs_key ins;
	int ret;
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	trans = btrfs_start_transaction(root, 1);
	BUG_ON(!trans);
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	btrfs_set_trans_block_group(trans, inode);

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	num_bytes = (end - start + blocksize) & ~(blocksize - 1);
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	num_bytes = max(blocksize,  num_bytes);
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	ret = btrfs_drop_extents(trans, root, inode,
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				 start, start + num_bytes, start, &alloc_hint);
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	orig_num_bytes = num_bytes;
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	if (alloc_hint == EXTENT_MAP_INLINE)
		goto out;

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	while(num_bytes > 0) {
		cur_alloc_size = min(num_bytes, root->fs_info->max_extent);
		ret = btrfs_alloc_extent(trans, root, cur_alloc_size,
					 root->root_key.objectid,
					 trans->transid,
					 inode->i_ino, start, 0,
					 alloc_hint, (u64)-1, &ins, 1);
		if (ret) {
			WARN_ON(1);
			goto out;
		}
		ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
					       start, ins.objectid, ins.offset,
					       ins.offset);
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		btrfs_check_file(root, inode);
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		num_bytes -= cur_alloc_size;
		alloc_hint = ins.objectid + ins.offset;
		start += cur_alloc_size;
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	}
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	btrfs_drop_extent_cache(inode, orig_start,
				orig_start + orig_num_bytes - 1);
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	btrfs_add_ordered_inode(inode);
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out:
	btrfs_end_transaction(trans, root);
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	return ret;
}

static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end)
{
	u64 extent_start;
	u64 extent_end;
	u64 bytenr;
	u64 cow_end;
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	u64 loops = 0;
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	u64 total_fs_bytes;
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	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct extent_buffer *leaf;
	int found_type;
	struct btrfs_path *path;
	struct btrfs_file_extent_item *item;
	int ret;
	int err;
	struct btrfs_key found_key;

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	total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
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	path = btrfs_alloc_path();
	BUG_ON(!path);
again:
	ret = btrfs_lookup_file_extent(NULL, root, path,
				       inode->i_ino, start, 0);
	if (ret < 0) {
		btrfs_free_path(path);
		return ret;
	}

	cow_end = end;
	if (ret != 0) {
		if (path->slots[0] == 0)
			goto not_found;
		path->slots[0]--;
	}

	leaf = path->nodes[0];
	item = btrfs_item_ptr(leaf, path->slots[0],
			      struct btrfs_file_extent_item);

	/* are we inside the extent that was found? */
	btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
	found_type = btrfs_key_type(&found_key);
	if (found_key.objectid != inode->i_ino ||
	    found_type != BTRFS_EXTENT_DATA_KEY) {
		goto not_found;
	}

	found_type = btrfs_file_extent_type(leaf, item);
	extent_start = found_key.offset;
	if (found_type == BTRFS_FILE_EXTENT_REG) {
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		u64 extent_num_bytes;

		extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item);
		extent_end = extent_start + extent_num_bytes;
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		err = 0;

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		if (loops && start != extent_start)
			goto not_found;

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		if (start < extent_start || start >= extent_end)
			goto not_found;

		cow_end = min(end, extent_end - 1);
		bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
		if (bytenr == 0)
			goto not_found;

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		/*
		 * we may be called by the resizer, make sure we're inside
		 * the limits of the FS
		 */
		if (bytenr + extent_num_bytes > total_fs_bytes)
			goto not_found;

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		if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) {
			goto not_found;
		}

		start = extent_end;
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	} else {
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		goto not_found;
	}
loop:
	if (start > end) {
		btrfs_free_path(path);
		return 0;
	}
	btrfs_release_path(root, path);
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	loops++;
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	goto again;

not_found:
	cow_file_range(inode, start, cow_end);
	start = cow_end + 1;
	goto loop;
}

static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
{
	struct btrfs_root *root = BTRFS_I(inode)->root;
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	u64 num_bytes;
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	int ret;
	mutex_lock(&root->fs_info->fs_mutex);
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	if (btrfs_test_opt(root, NODATACOW) ||
	    btrfs_test_flag(inode, NODATACOW))
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		ret = run_delalloc_nocow(inode, start, end);
	else
		ret = cow_file_range(inode, start, end);
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	spin_lock(&root->fs_info->delalloc_lock);
	num_bytes = end + 1 - start;
	if (root->fs_info->delalloc_bytes < num_bytes) {
		printk("delalloc accounting error total %llu sub %llu\n",
		       root->fs_info->delalloc_bytes, num_bytes);
	} else {
		root->fs_info->delalloc_bytes -= num_bytes;
	}
	spin_unlock(&root->fs_info->delalloc_lock);

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	mutex_unlock(&root->fs_info->fs_mutex);
	return ret;
}

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int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end)
{
	struct inode *inode = page->mapping->host;
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_trans_handle *trans;
	char *kaddr;
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	int ret = 0;
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	u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
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	size_t offset = start - page_start;
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	if (btrfs_test_opt(root, NODATASUM) ||
	    btrfs_test_flag(inode, NODATASUM))
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		return 0;
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	mutex_lock(&root->fs_info->fs_mutex);
	trans = btrfs_start_transaction(root, 1);
	btrfs_set_trans_block_group(trans, inode);
	kaddr = kmap(page);
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	btrfs_csum_file_block(trans, root, inode, inode->i_ino,
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			      start, kaddr + offset, end - start + 1);
	kunmap(page);
	ret = btrfs_end_transaction(trans, root);
	BUG_ON(ret);
	mutex_unlock(&root->fs_info->fs_mutex);
	return ret;
}

int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
{
	int ret = 0;
	struct inode *inode = page->mapping->host;
	struct btrfs_root *root = BTRFS_I(inode)->root;
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	struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
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	struct btrfs_csum_item *item;
	struct btrfs_path *path = NULL;
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	u32 csum;
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	if (btrfs_test_opt(root, NODATASUM) ||
	    btrfs_test_flag(inode, NODATASUM))
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		return 0;
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	mutex_lock(&root->fs_info->fs_mutex);
	path = btrfs_alloc_path();
	item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
	if (IS_ERR(item)) {
		ret = PTR_ERR(item);
		/* a csum that isn't present is a preallocated region. */
		if (ret == -ENOENT || ret == -EFBIG)
			ret = 0;
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		csum = 0;
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		goto out;
	}
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	read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
			   BTRFS_CRC32_SIZE);
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	set_state_private(io_tree, start, csum);
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out:
	if (path)
		btrfs_free_path(path);
	mutex_unlock(&root->fs_info->fs_mutex);
	return ret;
}

int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end)
{
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	size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
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	struct inode *inode = page->mapping->host;
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	struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
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	char *kaddr;
	u64 private;
	int ret;
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	struct btrfs_root *root = BTRFS_I(inode)->root;
	u32 csum = ~(u32)0;
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	unsigned long flags;
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	if (btrfs_test_opt(root, NODATASUM) ||
	    btrfs_test_flag(inode, NODATASUM))
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		return 0;
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	ret = get_state_private(io_tree, start, &private);
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	local_irq_save(flags);
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	kaddr = kmap_atomic(page, KM_IRQ0);
	if (ret) {
		goto zeroit;
	}
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	csum = btrfs_csum_data(root, kaddr + offset, csum,  end - start + 1);
	btrfs_csum_final(csum, (char *)&csum);
	if (csum != private) {
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		goto zeroit;
	}
	kunmap_atomic(kaddr, KM_IRQ0);
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	local_irq_restore(flags);
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	return 0;

zeroit:
	printk("btrfs csum failed ino %lu off %llu\n",
	       page->mapping->host->i_ino, (unsigned long long)start);
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	memset(kaddr + offset, 1, end - start + 1);
	flush_dcache_page(page);
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	kunmap_atomic(kaddr, KM_IRQ0);
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	local_irq_restore(flags);
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	return 0;
}
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void btrfs_read_locked_inode(struct inode *inode)
{
	struct btrfs_path *path;
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	struct extent_buffer *leaf;
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	struct btrfs_inode_item *inode_item;
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	struct btrfs_inode_timespec *tspec;
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	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_key location;
	u64 alloc_group_block;
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	u32 rdev;
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	int ret;

	path = btrfs_alloc_path();
	BUG_ON(!path);
	mutex_lock(&root->fs_info->fs_mutex);
	memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
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	ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
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	if (ret)
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		goto make_bad;

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	leaf = path->nodes[0];
	inode_item = btrfs_item_ptr(leaf, path->slots[0],
				    struct btrfs_inode_item);

	inode->i_mode = btrfs_inode_mode(leaf, inode_item);
	inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
	inode->i_uid = btrfs_inode_uid(leaf, inode_item);
	inode->i_gid = btrfs_inode_gid(leaf, inode_item);
	inode->i_size = btrfs_inode_size(leaf, inode_item);

	tspec = btrfs_inode_atime(inode_item);
	inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
	inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);

	tspec = btrfs_inode_mtime(inode_item);
	inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
	inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);

	tspec = btrfs_inode_ctime(inode_item);
	inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
	inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);

	inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
	inode->i_generation = btrfs_inode_generation(leaf, inode_item);
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	inode->i_rdev = 0;
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	rdev = btrfs_inode_rdev(leaf, inode_item);

	alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
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	BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
						       alloc_group_block);
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	BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
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	if (!BTRFS_I(inode)->block_group) {
		BTRFS_I(inode)->block_group = btrfs_find_block_group(root,
						         NULL, 0, 0, 0);
	}
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	btrfs_free_path(path);
	inode_item = NULL;

	mutex_unlock(&root->fs_info->fs_mutex);

	switch (inode->i_mode & S_IFMT) {
	case S_IFREG:
		inode->i_mapping->a_ops = &btrfs_aops;
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		BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
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		inode->i_fop = &btrfs_file_operations;
		inode->i_op = &btrfs_file_inode_operations;
		break;
	case S_IFDIR:
		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 = &btrfs_symlink_inode_operations;
		inode->i_mapping->a_ops = &btrfs_symlink_aops;
		break;
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	default:
		init_special_inode(inode, inode->i_mode, rdev);
		break;
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	}
	return;

make_bad:
	btrfs_release_path(root, path);
	btrfs_free_path(path);
	mutex_unlock(&root->fs_info->fs_mutex);
	make_bad_inode(inode);
}

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static void fill_inode_item(struct extent_buffer *leaf,
			    struct btrfs_inode_item *item,
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			    struct inode *inode)
{
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	btrfs_set_inode_uid(leaf, item, inode->i_uid);
	btrfs_set_inode_gid(leaf, item, inode->i_gid);
	btrfs_set_inode_size(leaf, item, inode->i_size);
	btrfs_set_inode_mode(leaf, item, inode->i_mode);
	btrfs_set_inode_nlink(leaf, item, inode->i_nlink);

	btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
			       inode->i_atime.tv_sec);
	btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
				inode->i_atime.tv_nsec);

	btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
			       inode->i_mtime.tv_sec);
	btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
				inode->i_mtime.tv_nsec);

	btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
			       inode->i_ctime.tv_sec);
	btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
				inode->i_ctime.tv_nsec);

	btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
	btrfs_set_inode_generation(leaf, item, inode->i_generation);
	btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
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	btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);
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	btrfs_set_inode_block_group(leaf, item,
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				    BTRFS_I(inode)->block_group->key.objectid);
}

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int btrfs_update_inode(struct btrfs_trans_handle *trans,
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			      struct btrfs_root *root,
			      struct inode *inode)
{
	struct btrfs_inode_item *inode_item;
	struct btrfs_path *path;
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	struct extent_buffer *leaf;
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	int ret;

	path = btrfs_alloc_path();
	BUG_ON(!path);
	ret = btrfs_lookup_inode(trans, root, path,
				 &BTRFS_I(inode)->location, 1);
	if (ret) {
		if (ret > 0)
			ret = -ENOENT;
		goto failed;
	}

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	leaf = path->nodes[0];
	inode_item = btrfs_item_ptr(leaf, path->slots[0],
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				  struct btrfs_inode_item);

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	fill_inode_item(leaf, inode_item, inode);
	btrfs_mark_buffer_dirty(leaf);
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	btrfs_set_inode_last_trans(trans, inode);
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	ret = 0;
failed:
	btrfs_release_path(root, path);
	btrfs_free_path(path);
	return ret;
}


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 = 0;
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	struct extent_buffer *leaf;
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	struct btrfs_dir_item *di;
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	struct btrfs_key key;
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	path = btrfs_alloc_path();
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	if (!path) {
		ret = -ENOMEM;
		goto err;
	}

C
Chris Mason 已提交
552 553 554 555 556 557 558 559 560 561
	di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
				    name, name_len, -1);
	if (IS_ERR(di)) {
		ret = PTR_ERR(di);
		goto err;
	}
	if (!di) {
		ret = -ENOENT;
		goto err;
	}
562 563
	leaf = path->nodes[0];
	btrfs_dir_item_key_to_cpu(leaf, di, &key);
C
Chris Mason 已提交
564
	ret = btrfs_delete_one_dir_name(trans, root, path, di);
565 566
	if (ret)
		goto err;
C
Chris Mason 已提交
567 568 569
	btrfs_release_path(root, path);

	di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
570
					 key.objectid, name, name_len, -1);
C
Chris Mason 已提交
571 572 573 574 575 576 577 578 579 580 581
	if (IS_ERR(di)) {
		ret = PTR_ERR(di);
		goto err;
	}
	if (!di) {
		ret = -ENOENT;
		goto err;
	}
	ret = btrfs_delete_one_dir_name(trans, root, path, di);

	dentry->d_inode->i_ctime = dir->i_ctime;
582 583 584 585 586 587 588 589
	ret = btrfs_del_inode_ref(trans, root, name, name_len,
				  dentry->d_inode->i_ino,
				  dentry->d_parent->d_inode->i_ino);
	if (ret) {
		printk("failed to delete reference to %.*s, "
		       "inode %lu parent %lu\n", name_len, name,
		       dentry->d_inode->i_ino,
		       dentry->d_parent->d_inode->i_ino);
590
	}
C
Chris Mason 已提交
591 592 593 594
err:
	btrfs_free_path(path);
	if (!ret) {
		dir->i_size -= name_len * 2;
595
		dir->i_mtime = dir->i_ctime = CURRENT_TIME;
C
Chris Mason 已提交
596
		btrfs_update_inode(trans, root, dir);
597 598 599
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
		dentry->d_inode->i_nlink--;
#else
C
Chris Mason 已提交
600
		drop_nlink(dentry->d_inode);
601
#endif
602
		ret = btrfs_update_inode(trans, root, dentry->d_inode);
C
Chris Mason 已提交
603 604 605 606 607 608 609 610 611
		dir->i_sb->s_dirt = 1;
	}
	return ret;
}

static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
{
	struct btrfs_root *root;
	struct btrfs_trans_handle *trans;
612
	struct inode *inode = dentry->d_inode;
C
Chris Mason 已提交
613
	int ret;
614
	unsigned long nr = 0;
C
Chris Mason 已提交
615 616 617

	root = BTRFS_I(dir)->root;
	mutex_lock(&root->fs_info->fs_mutex);
618 619 620 621 622

	ret = btrfs_check_free_space(root, 1, 1);
	if (ret)
		goto fail;

C
Chris Mason 已提交
623
	trans = btrfs_start_transaction(root, 1);
624

C
Chris Mason 已提交
625 626
	btrfs_set_trans_block_group(trans, dir);
	ret = btrfs_unlink_trans(trans, root, dir, dentry);
627
	nr = trans->blocks_used;
628

629 630 631 632 633 634 635 636 637 638 639 640
	if (inode->i_nlink == 0) {
		int found;
		/* if the inode isn't linked anywhere,
		 * we don't need to worry about
		 * data=ordered
		 */
		found = btrfs_del_ordered_inode(inode);
		if (found == 1) {
			atomic_dec(&inode->i_count);
		}
	}

C
Chris Mason 已提交
641
	btrfs_end_transaction(trans, root);
642
fail:
C
Chris Mason 已提交
643
	mutex_unlock(&root->fs_info->fs_mutex);
644
	btrfs_btree_balance_dirty(root, nr);
645
	btrfs_throttle(root);
C
Chris Mason 已提交
646 647 648 649 650 651
	return ret;
}

static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
{
	struct inode *inode = dentry->d_inode;
652
	int err = 0;
C
Chris Mason 已提交
653 654 655
	int ret;
	struct btrfs_root *root = BTRFS_I(dir)->root;
	struct btrfs_trans_handle *trans;
656
	unsigned long nr = 0;
C
Chris Mason 已提交
657

Y
Yan 已提交
658 659 660
	if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
		return -ENOTEMPTY;

C
Chris Mason 已提交
661
	mutex_lock(&root->fs_info->fs_mutex);
662 663 664 665
	ret = btrfs_check_free_space(root, 1, 1);
	if (ret)
		goto fail;

C
Chris Mason 已提交
666 667 668 669 670 671 672 673
	trans = btrfs_start_transaction(root, 1);
	btrfs_set_trans_block_group(trans, dir);

	/* now the directory is empty */
	err = btrfs_unlink_trans(trans, root, dir, dentry);
	if (!err) {
		inode->i_size = 0;
	}
674

675
	nr = trans->blocks_used;
C
Chris Mason 已提交
676
	ret = btrfs_end_transaction(trans, root);
677
fail:
Y
Yan 已提交
678
	mutex_unlock(&root->fs_info->fs_mutex);
679
	btrfs_btree_balance_dirty(root, nr);
680
	btrfs_throttle(root);
681

C
Chris Mason 已提交
682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699
	if (ret && !err)
		err = ret;
	return err;
}

static int btrfs_free_inode(struct btrfs_trans_handle *trans,
			    struct btrfs_root *root,
			    struct inode *inode)
{
	struct btrfs_path *path;
	int ret;

	clear_inode(inode);

	path = btrfs_alloc_path();
	BUG_ON(!path);
	ret = btrfs_lookup_inode(trans, root, path,
				 &BTRFS_I(inode)->location, -1);
700 701 702 703
	if (ret > 0)
		ret = -ENOENT;
	if (!ret)
		ret = btrfs_del_item(trans, root, path);
C
Chris Mason 已提交
704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722
	btrfs_free_path(path);
	return ret;
}

/*
 * this can truncate away extent items, csum items and directory items.
 * It starts at a high offset and removes keys until it can't find
 * any higher than i_size.
 *
 * csum items that cross the new i_size are truncated to the new size
 * as well.
 */
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;
723
	struct btrfs_key found_key;
C
Chris Mason 已提交
724
	u32 found_type;
725
	struct extent_buffer *leaf;
C
Chris Mason 已提交
726 727
	struct btrfs_file_extent_item *fi;
	u64 extent_start = 0;
728
	u64 extent_num_bytes = 0;
C
Chris Mason 已提交
729
	u64 item_end = 0;
730
	u64 root_gen = 0;
731
	u64 root_owner = 0;
C
Chris Mason 已提交
732 733
	int found_extent;
	int del_item;
734
	int extent_type = -1;
C
Chris Mason 已提交
735

736
	btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1);
C
Chris Mason 已提交
737
	path = btrfs_alloc_path();
738
	path->reada = -1;
C
Chris Mason 已提交
739
	BUG_ON(!path);
740

C
Chris Mason 已提交
741 742 743
	/* FIXME, add redo link to tree so we don't leak on crash */
	key.objectid = inode->i_ino;
	key.offset = (u64)-1;
744 745
	key.type = (u8)-1;

C
Chris Mason 已提交
746 747 748 749 750 751 752 753 754 755 756
	while(1) {
		btrfs_init_path(path);
		fi = NULL;
		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]--;
		}
757 758 759
		leaf = path->nodes[0];
		btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
		found_type = btrfs_key_type(&found_key);
C
Chris Mason 已提交
760

761
		if (found_key.objectid != inode->i_ino)
C
Chris Mason 已提交
762
			break;
763

C
Chris Mason 已提交
764 765 766 767 768 769
		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;

770
		item_end = found_key.offset;
C
Chris Mason 已提交
771
		if (found_type == BTRFS_EXTENT_DATA_KEY) {
772
			fi = btrfs_item_ptr(leaf, path->slots[0],
C
Chris Mason 已提交
773
					    struct btrfs_file_extent_item);
774 775
			extent_type = btrfs_file_extent_type(leaf, fi);
			if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
776
				item_end +=
777
				    btrfs_file_extent_num_bytes(leaf, fi);
778 779 780 781 782
			} else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
				struct btrfs_item *item = btrfs_item_nr(leaf,
							        path->slots[0]);
				item_end += btrfs_file_extent_inline_len(leaf,
									 item);
C
Chris Mason 已提交
783
			}
784
			item_end--;
C
Chris Mason 已提交
785 786 787 788 789 790
		}
		if (found_type == BTRFS_CSUM_ITEM_KEY) {
			ret = btrfs_csum_truncate(trans, root, path,
						  inode->i_size);
			BUG_ON(ret);
		}
791
		if (item_end < inode->i_size) {
792 793 794 795 796 797 798 799
			if (found_type == BTRFS_DIR_ITEM_KEY) {
				found_type = BTRFS_INODE_ITEM_KEY;
			} else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
				found_type = BTRFS_CSUM_ITEM_KEY;
			} else if (found_type) {
				found_type--;
			} else {
				break;
C
Chris Mason 已提交
800
			}
801
			btrfs_set_key_type(&key, found_type);
Y
Yan 已提交
802
			btrfs_release_path(root, path);
803
			continue;
C
Chris Mason 已提交
804
		}
805
		if (found_key.offset >= inode->i_size)
C
Chris Mason 已提交
806 807 808 809 810 811
			del_item = 1;
		else
			del_item = 0;
		found_extent = 0;

		/* FIXME, shrink the extent if the ref count is only 1 */
812 813 814 815
		if (found_type != BTRFS_EXTENT_DATA_KEY)
			goto delete;

		if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
C
Chris Mason 已提交
816
			u64 num_dec;
817
			extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
C
Chris Mason 已提交
818
			if (!del_item) {
819 820 821
				u64 orig_num_bytes =
					btrfs_file_extent_num_bytes(leaf, fi);
				extent_num_bytes = inode->i_size -
822
					found_key.offset + root->sectorsize - 1;
823 824 825 826
				btrfs_set_file_extent_num_bytes(leaf, fi,
							 extent_num_bytes);
				num_dec = (orig_num_bytes -
					   extent_num_bytes) >> 9;
827 828 829
				if (extent_start != 0) {
					inode->i_blocks -= num_dec;
				}
830
				btrfs_mark_buffer_dirty(leaf);
C
Chris Mason 已提交
831
			} else {
832 833 834
				extent_num_bytes =
					btrfs_file_extent_disk_num_bytes(leaf,
									 fi);
C
Chris Mason 已提交
835
				/* FIXME blocksize != 4096 */
836 837
				num_dec = btrfs_file_extent_num_bytes(leaf,
								       fi) >> 9;
C
Chris Mason 已提交
838 839 840 841
				if (extent_start != 0) {
					found_extent = 1;
					inode->i_blocks -= num_dec;
				}
842 843
				root_gen = btrfs_header_generation(leaf);
				root_owner = btrfs_header_owner(leaf);
C
Chris Mason 已提交
844
			}
845 846 847 848 849 850 851
		} else if (extent_type == BTRFS_FILE_EXTENT_INLINE &&
			   !del_item) {
			u32 newsize = inode->i_size - found_key.offset;
			newsize = btrfs_file_extent_calc_inline_size(newsize);
			ret = btrfs_truncate_item(trans, root, path,
						  newsize, 1);
			BUG_ON(ret);
C
Chris Mason 已提交
852
		}
853
delete:
C
Chris Mason 已提交
854 855
		if (del_item) {
			ret = btrfs_del_item(trans, root, path);
856 857
			if (ret)
				goto error;
C
Chris Mason 已提交
858 859 860 861 862 863
		} else {
			break;
		}
		btrfs_release_path(root, path);
		if (found_extent) {
			ret = btrfs_free_extent(trans, root, extent_start,
864
						extent_num_bytes,
865
						root_owner,
866 867
						root_gen, inode->i_ino,
						found_key.offset, 0);
C
Chris Mason 已提交
868 869 870 871 872 873 874 875 876 877 878
			BUG_ON(ret);
		}
	}
	ret = 0;
error:
	btrfs_release_path(root, path);
	btrfs_free_path(path);
	inode->i_sb->s_dirt = 1;
	return ret;
}

879
static int btrfs_cow_one_page(struct inode *inode, struct page *page,
880 881 882
			      size_t zero_start)
{
	char *kaddr;
883
	struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
884
	struct btrfs_root *root = BTRFS_I(inode)->root;
885
	u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
886
	u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
887 888 889
	u64 existing_delalloc;
	u64 delalloc_start;
	int ret = 0;
890

891
	WARN_ON(!PageLocked(page));
892
	set_page_extent_mapped(page);
893

894
	lock_extent(io_tree, page_start, page_end, GFP_NOFS);
895
	delalloc_start = page_start;
896
	existing_delalloc = count_range_bits(&BTRFS_I(inode)->io_tree,
897 898
					     &delalloc_start, page_end,
					     PAGE_CACHE_SIZE, EXTENT_DELALLOC);
899
	set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start,
900
			    page_end, GFP_NOFS);
901 902 903 904 905

	spin_lock(&root->fs_info->delalloc_lock);
	root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE - existing_delalloc;
	spin_unlock(&root->fs_info->delalloc_lock);

906
	if (zero_start != PAGE_CACHE_SIZE) {
907
		kaddr = kmap(page);
908 909
		memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
		flush_dcache_page(page);
910
		kunmap(page);
911
	}
912
	set_page_dirty(page);
913
	unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
914 915 916 917

	return ret;
}

C
Chris Mason 已提交
918 919 920 921 922 923 924
/*
 * taken from block_truncate_page, but does cow as it zeros out
 * any bytes left in the last page in the file.
 */
static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
{
	struct inode *inode = mapping->host;
925 926
	struct btrfs_root *root = BTRFS_I(inode)->root;
	u32 blocksize = root->sectorsize;
C
Chris Mason 已提交
927 928 929 930
	pgoff_t index = from >> PAGE_CACHE_SHIFT;
	unsigned offset = from & (PAGE_CACHE_SIZE-1);
	struct page *page;
	int ret = 0;
931
	u64 page_start;
C
Chris Mason 已提交
932 933 934 935 936 937 938 939 940

	if ((offset & (blocksize - 1)) == 0)
		goto out;

	ret = -ENOMEM;
	page = grab_cache_page(mapping, index);
	if (!page)
		goto out;
	if (!PageUptodate(page)) {
C
Chris Mason 已提交
941
		ret = btrfs_readpage(NULL, page);
C
Chris Mason 已提交
942 943 944 945 946 947
		lock_page(page);
		if (!PageUptodate(page)) {
			ret = -EIO;
			goto out;
		}
	}
948
	page_start = (u64)page->index << PAGE_CACHE_SHIFT;
949

950
	ret = btrfs_cow_one_page(inode, page, offset);
C
Chris Mason 已提交
951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970

	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;
971
		struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
C
Chris Mason 已提交
972

973
		u64 mask = root->sectorsize - 1;
C
Chris Mason 已提交
974
		u64 pos = (inode->i_size + mask) & ~mask;
C
Chris Mason 已提交
975
		u64 block_end = attr->ia_size | mask;
976
		u64 hole_start;
C
Chris Mason 已提交
977
		u64 hole_size;
978
		u64 alloc_hint = 0;
C
Chris Mason 已提交
979 980 981 982

		if (attr->ia_size <= pos)
			goto out;

983 984 985 986 987
		if (pos != inode->i_size)
			hole_start = pos + root->sectorsize;
		else
			hole_start = pos;

988 989 990 991 992 993
		mutex_lock(&root->fs_info->fs_mutex);
		err = btrfs_check_free_space(root, 1, 0);
		mutex_unlock(&root->fs_info->fs_mutex);
		if (err)
			goto fail;

C
Chris Mason 已提交
994 995
		btrfs_truncate_page(inode->i_mapping, inode->i_size);

996
		lock_extent(io_tree, pos, block_end, GFP_NOFS);
997
		hole_size = block_end - hole_start;
C
Chris Mason 已提交
998 999 1000 1001

		mutex_lock(&root->fs_info->fs_mutex);
		trans = btrfs_start_transaction(root, 1);
		btrfs_set_trans_block_group(trans, inode);
C
Chris Mason 已提交
1002
		err = btrfs_drop_extents(trans, root, inode,
1003
					 pos, block_end, pos,
1004
					 &alloc_hint);
C
Chris Mason 已提交
1005

1006 1007 1008
		if (alloc_hint != EXTENT_MAP_INLINE) {
			err = btrfs_insert_file_extent(trans, root,
						       inode->i_ino,
1009 1010
						       hole_start, 0, 0,
						       hole_size);
1011 1012
			btrfs_drop_extent_cache(inode, hole_start,
						hole_size - 1);
1013
			btrfs_check_file(root, inode);
1014
		}
C
Chris Mason 已提交
1015 1016
		btrfs_end_transaction(trans, root);
		mutex_unlock(&root->fs_info->fs_mutex);
1017
		unlock_extent(io_tree, pos, block_end, GFP_NOFS);
1018 1019
		if (err)
			return err;
C
Chris Mason 已提交
1020 1021 1022
	}
out:
	err = inode_setattr(inode, attr);
1023
fail:
C
Chris Mason 已提交
1024 1025
	return err;
}
1026

1027
void btrfs_put_inode(struct inode *inode)
1028
{
1029 1030 1031
	int ret;

	if (!BTRFS_I(inode)->ordered_trans) {
1032 1033
		return;
	}
1034 1035 1036 1037 1038 1039 1040 1041 1042

	if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
	    mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK))
		return;

	ret = btrfs_del_ordered_inode(inode);
	if (ret == 1) {
		atomic_dec(&inode->i_count);
	}
1043 1044
}

C
Chris Mason 已提交
1045 1046 1047 1048
void btrfs_delete_inode(struct inode *inode)
{
	struct btrfs_trans_handle *trans;
	struct btrfs_root *root = BTRFS_I(inode)->root;
1049
	unsigned long nr;
C
Chris Mason 已提交
1050 1051 1052 1053 1054 1055
	int ret;

	truncate_inode_pages(&inode->i_data, 0);
	if (is_bad_inode(inode)) {
		goto no_delete;
	}
1056

C
Chris Mason 已提交
1057 1058 1059
	inode->i_size = 0;
	mutex_lock(&root->fs_info->fs_mutex);
	trans = btrfs_start_transaction(root, 1);
1060

C
Chris Mason 已提交
1061 1062
	btrfs_set_trans_block_group(trans, inode);
	ret = btrfs_truncate_in_trans(trans, root, inode);
J
Josef Bacik 已提交
1063 1064 1065
	if (ret)
		goto no_delete_lock;
	ret = btrfs_delete_xattrs(trans, root, inode);
1066 1067 1068 1069 1070
	if (ret)
		goto no_delete_lock;
	ret = btrfs_free_inode(trans, root, inode);
	if (ret)
		goto no_delete_lock;
1071
	nr = trans->blocks_used;
1072

C
Chris Mason 已提交
1073 1074
	btrfs_end_transaction(trans, root);
	mutex_unlock(&root->fs_info->fs_mutex);
1075
	btrfs_btree_balance_dirty(root, nr);
1076
	btrfs_throttle(root);
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1077
	return;
1078 1079

no_delete_lock:
1080
	nr = trans->blocks_used;
1081 1082
	btrfs_end_transaction(trans, root);
	mutex_unlock(&root->fs_info->fs_mutex);
1083
	btrfs_btree_balance_dirty(root, nr);
1084
	btrfs_throttle(root);
C
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1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100
no_delete:
	clear_inode(inode);
}

/*
 * this returns the key found in the dir entry in the location pointer.
 * If no dir entries were found, location->objectid is 0.
 */
static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
			       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_I(dir)->root;
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	int ret = 0;
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1103 1104 1105 1106 1107 1108
	if (namelen == 1 && strcmp(name, ".") == 0) {
		location->objectid = dir->i_ino;
		location->type = BTRFS_INODE_ITEM_KEY;
		location->offset = 0;
		return 0;
	}
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1109 1110
	path = btrfs_alloc_path();
	BUG_ON(!path);
1111

1112
	if (namelen == 2 && strcmp(name, "..") == 0) {
1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141
		struct btrfs_key key;
		struct extent_buffer *leaf;
		u32 nritems;
		int slot;

		key.objectid = dir->i_ino;
		btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
		key.offset = 0;
		ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
		BUG_ON(ret == 0);
		ret = 0;

		leaf = path->nodes[0];
		slot = path->slots[0];
		nritems = btrfs_header_nritems(leaf);
		if (slot >= nritems)
			goto out_err;

		btrfs_item_key_to_cpu(leaf, &key, slot);
		if (key.objectid != dir->i_ino ||
		    key.type != BTRFS_INODE_REF_KEY) {
			goto out_err;
		}
		location->objectid = key.offset;
		location->type = BTRFS_INODE_ITEM_KEY;
		location->offset = 0;
		goto out;
	}

C
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1142 1143
	di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
				    namelen, 0);
Y
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1144 1145
	if (IS_ERR(di))
		ret = PTR_ERR(di);
C
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1146
	if (!di || IS_ERR(di)) {
1147
		goto out_err;
C
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1148
	}
1149
	btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
C
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1150 1151 1152
out:
	btrfs_free_path(path);
	return ret;
1153 1154 1155
out_err:
	location->objectid = 0;
	goto out;
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1156 1157 1158 1159 1160 1161 1162 1163 1164
}

/*
 * when we hit a tree root in a directory, the btrfs part of the inode
 * needs to be changed to reflect the root directory of the tree root.  This
 * is kind of like crossing a mount point.
 */
static int fixup_tree_root_location(struct btrfs_root *root,
			     struct btrfs_key *location,
1165 1166
			     struct btrfs_root **sub_root,
			     struct dentry *dentry)
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1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179
{
	struct btrfs_path *path;
	struct btrfs_root_item *ri;

	if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
		return 0;
	if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
		return 0;

	path = btrfs_alloc_path();
	BUG_ON(!path);
	mutex_lock(&root->fs_info->fs_mutex);

1180 1181 1182
	*sub_root = btrfs_read_fs_root(root->fs_info, location,
					dentry->d_name.name,
					dentry->d_name.len);
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1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200
	if (IS_ERR(*sub_root))
		return PTR_ERR(*sub_root);

	ri = &(*sub_root)->root_item;
	location->objectid = btrfs_root_dirid(ri);
	btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
	location->offset = 0;

	btrfs_free_path(path);
	mutex_unlock(&root->fs_info->fs_mutex);
	return 0;
}

static int btrfs_init_locked_inode(struct inode *inode, void *p)
{
	struct btrfs_iget_args *args = p;
	inode->i_ino = args->ino;
	BTRFS_I(inode)->root = args->root;
1201 1202
	extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
	extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1203
			     inode->i_mapping, GFP_NOFS);
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1204 1205 1206 1207 1208 1209 1210 1211 1212 1213
	return 0;
}

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);
}

C
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1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226
struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
			    u64 root_objectid)
{
	struct btrfs_iget_args args;
	args.ino = objectid;
	args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid);

	if (!args.root)
		return NULL;

	return ilookup5(s, objectid, btrfs_find_actor, (void *)&args);
}

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1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252
struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
				struct btrfs_root *root)
{
	struct inode *inode;
	struct btrfs_iget_args args;
	args.ino = objectid;
	args.root = root;

	inode = iget5_locked(s, objectid, btrfs_find_actor,
			     btrfs_init_locked_inode,
			     (void *)&args);
	return inode;
}

static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
				   struct nameidata *nd)
{
	struct inode * inode;
	struct btrfs_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);
1253

C
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1254 1255 1256
	mutex_lock(&root->fs_info->fs_mutex);
	ret = btrfs_inode_by_name(dir, dentry, &location);
	mutex_unlock(&root->fs_info->fs_mutex);
1257

C
Chris Mason 已提交
1258 1259
	if (ret < 0)
		return ERR_PTR(ret);
1260

C
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1261 1262
	inode = NULL;
	if (location.objectid) {
1263 1264
		ret = fixup_tree_root_location(root, &location, &sub_root,
						dentry);
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1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294
		if (ret < 0)
			return ERR_PTR(ret);
		if (ret > 0)
			return ERR_PTR(-ENOENT);
		inode = btrfs_iget_locked(dir->i_sb, location.objectid,
					  sub_root);
		if (!inode)
			return ERR_PTR(-EACCES);
		if (inode->i_state & I_NEW) {
			/* the inode and parent dir are two different roots */
			if (sub_root != root) {
				igrab(inode);
				sub_root->inode = inode;
			}
			BTRFS_I(inode)->root = sub_root;
			memcpy(&BTRFS_I(inode)->location, &location,
			       sizeof(location));
			btrfs_read_locked_inode(inode);
			unlock_new_inode(inode);
		}
	}
	return d_splice_alias(inode, dentry);
}

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)
{
1295
	struct inode *inode = filp->f_dentry->d_inode;
C
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1296 1297 1298 1299
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_item *item;
	struct btrfs_dir_item *di;
	struct btrfs_key key;
1300
	struct btrfs_key found_key;
C
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1301 1302 1303
	struct btrfs_path *path;
	int ret;
	u32 nritems;
1304
	struct extent_buffer *leaf;
C
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1305 1306 1307 1308 1309 1310 1311 1312
	int slot;
	int advance;
	unsigned char d_type;
	int over = 0;
	u32 di_cur;
	u32 di_total;
	u32 di_len;
	int key_type = BTRFS_DIR_INDEX_KEY;
1313 1314 1315
	char tmp_name[32];
	char *name_ptr;
	int name_len;
C
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1316 1317 1318 1319

	/* FIXME, use a real flag for deciding about the key type */
	if (root->fs_info->tree_root == root)
		key_type = BTRFS_DIR_ITEM_KEY;
1320

1321 1322 1323 1324 1325 1326 1327 1328 1329 1330
	/* special case for "." */
	if (filp->f_pos == 0) {
		over = filldir(dirent, ".", 1,
			       1, inode->i_ino,
			       DT_DIR);
		if (over)
			return 0;
		filp->f_pos = 1;
	}

C
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1331 1332
	mutex_lock(&root->fs_info->fs_mutex);
	key.objectid = inode->i_ino;
1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361
	path = btrfs_alloc_path();
	path->reada = 2;

	/* special case for .., just use the back ref */
	if (filp->f_pos == 1) {
		btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
		key.offset = 0;
		ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
		BUG_ON(ret == 0);
		leaf = path->nodes[0];
		slot = path->slots[0];
		nritems = btrfs_header_nritems(leaf);
		if (slot >= nritems) {
			btrfs_release_path(root, path);
			goto read_dir_items;
		}
		btrfs_item_key_to_cpu(leaf, &found_key, slot);
		btrfs_release_path(root, path);
		if (found_key.objectid != key.objectid ||
		    found_key.type != BTRFS_INODE_REF_KEY)
			goto read_dir_items;
		over = filldir(dirent, "..", 2,
			       2, found_key.offset, DT_DIR);
		if (over)
			goto nopos;
		filp->f_pos = 2;
	}

read_dir_items:
C
Chris Mason 已提交
1362 1363
	btrfs_set_key_type(&key, key_type);
	key.offset = filp->f_pos;
1364

C
Chris Mason 已提交
1365 1366 1367 1368 1369
	ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
	if (ret < 0)
		goto err;
	advance = 0;
	while(1) {
1370 1371
		leaf = path->nodes[0];
		nritems = btrfs_header_nritems(leaf);
C
Chris Mason 已提交
1372 1373 1374 1375 1376 1377
		slot = path->slots[0];
		if (advance || slot >= nritems) {
			if (slot >= nritems -1) {
				ret = btrfs_next_leaf(root, path);
				if (ret)
					break;
1378 1379
				leaf = path->nodes[0];
				nritems = btrfs_header_nritems(leaf);
C
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1380 1381 1382 1383 1384 1385 1386
				slot = path->slots[0];
			} else {
				slot++;
				path->slots[0]++;
			}
		}
		advance = 1;
1387 1388 1389 1390
		item = btrfs_item_nr(leaf, slot);
		btrfs_item_key_to_cpu(leaf, &found_key, slot);

		if (found_key.objectid != key.objectid)
C
Chris Mason 已提交
1391
			break;
1392
		if (btrfs_key_type(&found_key) != key_type)
C
Chris Mason 已提交
1393
			break;
1394
		if (found_key.offset < filp->f_pos)
C
Chris Mason 已提交
1395
			continue;
1396 1397

		filp->f_pos = found_key.offset;
C
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1398 1399 1400
		advance = 1;
		di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
		di_cur = 0;
1401
		di_total = btrfs_item_size(leaf, item);
C
Chris Mason 已提交
1402
		while(di_cur < di_total) {
1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419
			struct btrfs_key location;

			name_len = btrfs_dir_name_len(leaf, di);
			if (name_len < 32) {
				name_ptr = tmp_name;
			} else {
				name_ptr = kmalloc(name_len, GFP_NOFS);
				BUG_ON(!name_ptr);
			}
			read_extent_buffer(leaf, name_ptr,
					   (unsigned long)(di + 1), name_len);

			d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
			btrfs_dir_item_key_to_cpu(leaf, di, &location);
			over = filldir(dirent, name_ptr, name_len,
				       found_key.offset,
				       location.objectid,
C
Chris Mason 已提交
1420
				       d_type);
1421 1422 1423 1424

			if (name_ptr != tmp_name)
				kfree(name_ptr);

C
Chris Mason 已提交
1425 1426
			if (over)
				goto nopos;
J
Josef Bacik 已提交
1427 1428
			di_len = btrfs_dir_name_len(leaf, di) +
				btrfs_dir_data_len(leaf, di) +sizeof(*di);
C
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1429 1430 1431 1432
			di_cur += di_len;
			di = (struct btrfs_dir_item *)((char *)di + di_len);
		}
	}
1433
	filp->f_pos = INT_LIMIT(typeof(filp->f_pos));
C
Chris Mason 已提交
1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459
nopos:
	ret = 0;
err:
	btrfs_release_path(root, path);
	btrfs_free_path(path);
	mutex_unlock(&root->fs_info->fs_mutex);
	return ret;
}

int btrfs_write_inode(struct inode *inode, int wait)
{
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_trans_handle *trans;
	int ret = 0;

	if (wait) {
		mutex_lock(&root->fs_info->fs_mutex);
		trans = btrfs_start_transaction(root, 1);
		btrfs_set_trans_block_group(trans, inode);
		ret = btrfs_commit_transaction(trans, root);
		mutex_unlock(&root->fs_info->fs_mutex);
	}
	return ret;
}

/*
1460
 * This is somewhat expensive, updating the tree every time the
C
Chris Mason 已提交
1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484
 * inode changes.  But, it is most likely to find the inode in cache.
 * FIXME, needs more benchmarking...there are no reasons other than performance
 * to keep or drop this code.
 */
void btrfs_dirty_inode(struct inode *inode)
{
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_trans_handle *trans;

	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);
}

static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
				     struct btrfs_root *root,
				     u64 objectid,
				     struct btrfs_block_group_cache *group,
				     int mode)
{
	struct inode *inode;
1485
	struct btrfs_inode_item *inode_item;
C
Chris Mason 已提交
1486
	struct btrfs_key *location;
1487
	struct btrfs_path *path;
C
Chris Mason 已提交
1488 1489 1490
	int ret;
	int owner;

1491 1492 1493
	path = btrfs_alloc_path();
	BUG_ON(!path);

C
Chris Mason 已提交
1494 1495 1496 1497
	inode = new_inode(root->fs_info->sb);
	if (!inode)
		return ERR_PTR(-ENOMEM);

1498 1499
	extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
	extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1500
			     inode->i_mapping, GFP_NOFS);
C
Chris Mason 已提交
1501
	BTRFS_I(inode)->root = root;
1502

C
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1503 1504 1505 1506 1507 1508
	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;
Y
Yan 已提交
1509
	BTRFS_I(inode)->flags = 0;
1510 1511 1512 1513
	ret = btrfs_insert_empty_inode(trans, root, path, objectid);
	if (ret)
		goto fail;

C
Chris Mason 已提交
1514 1515 1516 1517 1518 1519
	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;
1520 1521 1522 1523 1524 1525
	inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
				  struct btrfs_inode_item);
	fill_inode_item(path->nodes[0], inode_item, inode);
	btrfs_mark_buffer_dirty(path->nodes[0]);
	btrfs_free_path(path);

C
Chris Mason 已提交
1526 1527 1528 1529 1530 1531 1532
	location = &BTRFS_I(inode)->location;
	location->objectid = objectid;
	location->offset = 0;
	btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);

	insert_inode_hash(inode);
	return inode;
1533 1534 1535
fail:
	btrfs_free_path(path);
	return ERR_PTR(ret);
C
Chris Mason 已提交
1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548
}

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)
{
	int ret;
	struct btrfs_key key;
	struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
1549
	struct inode *parent_inode;
1550

C
Chris Mason 已提交
1551 1552 1553 1554 1555 1556 1557 1558 1559
	key.objectid = inode->i_ino;
	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,
				    &key, btrfs_inode_type(inode));
	if (ret == 0) {
1560 1561 1562 1563 1564
		ret = btrfs_insert_inode_ref(trans, root,
				     dentry->d_name.name,
				     dentry->d_name.len,
				     inode->i_ino,
				     dentry->d_parent->d_inode->i_ino);
1565 1566 1567
		parent_inode = dentry->d_parent->d_inode;
		parent_inode->i_size += dentry->d_name.len * 2;
		parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
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1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586
		ret = btrfs_update_inode(trans, root,
					 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;
	return err;
}

J
Josef Bacik 已提交
1587 1588 1589 1590 1591
static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
			int mode, dev_t rdev)
{
	struct btrfs_trans_handle *trans;
	struct btrfs_root *root = BTRFS_I(dir)->root;
1592
	struct inode *inode = NULL;
J
Josef Bacik 已提交
1593 1594 1595
	int err;
	int drop_inode = 0;
	u64 objectid;
1596
	unsigned long nr = 0;
J
Josef Bacik 已提交
1597 1598 1599 1600 1601

	if (!new_valid_dev(rdev))
		return -EINVAL;

	mutex_lock(&root->fs_info->fs_mutex);
1602 1603 1604 1605
	err = btrfs_check_free_space(root, 1, 0);
	if (err)
		goto fail;

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1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627
	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, mode);
	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_op = &btrfs_special_inode_operations;
		init_special_inode(inode, inode->i_mode, rdev);
1628
		btrfs_update_inode(trans, root, inode);
J
Josef Bacik 已提交
1629 1630 1631 1632 1633
	}
	dir->i_sb->s_dirt = 1;
	btrfs_update_inode_block_group(trans, inode);
	btrfs_update_inode_block_group(trans, dir);
out_unlock:
1634
	nr = trans->blocks_used;
J
Josef Bacik 已提交
1635
	btrfs_end_transaction(trans, root);
1636
fail:
J
Josef Bacik 已提交
1637 1638 1639 1640 1641 1642
	mutex_unlock(&root->fs_info->fs_mutex);

	if (drop_inode) {
		inode_dec_link_count(inode);
		iput(inode);
	}
1643
	btrfs_btree_balance_dirty(root, nr);
1644
	btrfs_throttle(root);
J
Josef Bacik 已提交
1645 1646 1647
	return err;
}

C
Chris Mason 已提交
1648 1649 1650 1651 1652
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_I(dir)->root;
1653
	struct inode *inode = NULL;
C
Chris Mason 已提交
1654 1655
	int err;
	int drop_inode = 0;
1656
	unsigned long nr = 0;
C
Chris Mason 已提交
1657 1658 1659
	u64 objectid;

	mutex_lock(&root->fs_info->fs_mutex);
1660 1661 1662
	err = btrfs_check_free_space(root, 1, 0);
	if (err)
		goto fail;
C
Chris Mason 已提交
1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685
	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, mode);
	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;
1686 1687
		extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
		extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1688
				     inode->i_mapping, GFP_NOFS);
1689
		BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
C
Chris Mason 已提交
1690 1691 1692 1693 1694
	}
	dir->i_sb->s_dirt = 1;
	btrfs_update_inode_block_group(trans, inode);
	btrfs_update_inode_block_group(trans, dir);
out_unlock:
1695
	nr = trans->blocks_used;
C
Chris Mason 已提交
1696
	btrfs_end_transaction(trans, root);
1697
fail:
C
Chris Mason 已提交
1698 1699 1700 1701 1702 1703
	mutex_unlock(&root->fs_info->fs_mutex);

	if (drop_inode) {
		inode_dec_link_count(inode);
		iput(inode);
	}
1704
	btrfs_btree_balance_dirty(root, nr);
1705
	btrfs_throttle(root);
C
Chris Mason 已提交
1706 1707 1708 1709 1710 1711 1712 1713 1714
	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;
1715
	unsigned long nr = 0;
C
Chris Mason 已提交
1716 1717 1718 1719 1720 1721
	int err;
	int drop_inode = 0;

	if (inode->i_nlink == 0)
		return -ENOENT;

1722 1723 1724
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
	inode->i_nlink++;
#else
C
Chris Mason 已提交
1725
	inc_nlink(inode);
1726
#endif
C
Chris Mason 已提交
1727
	mutex_lock(&root->fs_info->fs_mutex);
1728 1729 1730
	err = btrfs_check_free_space(root, 1, 0);
	if (err)
		goto fail;
C
Chris Mason 已提交
1731
	trans = btrfs_start_transaction(root, 1);
1732

C
Chris Mason 已提交
1733 1734 1735
	btrfs_set_trans_block_group(trans, dir);
	atomic_inc(&inode->i_count);
	err = btrfs_add_nondir(trans, dentry, inode);
1736

C
Chris Mason 已提交
1737 1738
	if (err)
		drop_inode = 1;
1739

C
Chris Mason 已提交
1740 1741
	dir->i_sb->s_dirt = 1;
	btrfs_update_inode_block_group(trans, dir);
1742
	err = btrfs_update_inode(trans, root, inode);
1743

1744 1745
	if (err)
		drop_inode = 1;
C
Chris Mason 已提交
1746

1747
	nr = trans->blocks_used;
C
Chris Mason 已提交
1748
	btrfs_end_transaction(trans, root);
1749
fail:
C
Chris Mason 已提交
1750 1751 1752 1753 1754 1755
	mutex_unlock(&root->fs_info->fs_mutex);

	if (drop_inode) {
		inode_dec_link_count(inode);
		iput(inode);
	}
1756
	btrfs_btree_balance_dirty(root, nr);
1757
	btrfs_throttle(root);
C
Chris Mason 已提交
1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768
	return err;
}

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_I(dir)->root;
	int err = 0;
	int drop_on_err = 0;
	u64 objectid;
1769
	unsigned long nr = 1;
C
Chris Mason 已提交
1770 1771

	mutex_lock(&root->fs_info->fs_mutex);
1772 1773 1774 1775
	err = btrfs_check_free_space(root, 1, 0);
	if (err)
		goto out_unlock;

C
Chris Mason 已提交
1776 1777
	trans = btrfs_start_transaction(root, 1);
	btrfs_set_trans_block_group(trans, dir);
1778

C
Chris Mason 已提交
1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795
	if (IS_ERR(trans)) {
		err = PTR_ERR(trans);
		goto out_unlock;
	}

	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_IFDIR | mode);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		goto out_fail;
	}
1796

C
Chris Mason 已提交
1797 1798 1799 1800 1801
	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);

1802
	inode->i_size = 0;
C
Chris Mason 已提交
1803 1804 1805
	err = btrfs_update_inode(trans, root, inode);
	if (err)
		goto out_fail;
1806

C
Chris Mason 已提交
1807 1808 1809
	err = btrfs_add_link(trans, dentry, inode);
	if (err)
		goto out_fail;
1810

C
Chris Mason 已提交
1811 1812 1813 1814 1815 1816 1817
	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:
1818
	nr = trans->blocks_used;
C
Chris Mason 已提交
1819
	btrfs_end_transaction(trans, root);
1820

C
Chris Mason 已提交
1821 1822 1823 1824
out_unlock:
	mutex_unlock(&root->fs_info->fs_mutex);
	if (drop_on_err)
		iput(inode);
1825
	btrfs_btree_balance_dirty(root, nr);
1826
	btrfs_throttle(root);
C
Chris Mason 已提交
1827 1828 1829
	return err;
}

1830
struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1831
				    size_t page_offset, u64 start, u64 len,
1832 1833 1834 1835
				    int create)
{
	int ret;
	int err = 0;
1836
	u64 bytenr;
1837 1838 1839 1840 1841 1842 1843
	u64 extent_start = 0;
	u64 extent_end = 0;
	u64 objectid = inode->i_ino;
	u32 found_type;
	struct btrfs_path *path;
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_file_extent_item *item;
1844 1845
	struct extent_buffer *leaf;
	struct btrfs_key found_key;
1846 1847
	struct extent_map *em = NULL;
	struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1848
	struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1849 1850 1851 1852 1853 1854 1855
	struct btrfs_trans_handle *trans = NULL;

	path = btrfs_alloc_path();
	BUG_ON(!path);
	mutex_lock(&root->fs_info->fs_mutex);

again:
1856 1857 1858 1859
	spin_lock(&em_tree->lock);
	em = lookup_extent_mapping(em_tree, start, len);
	spin_unlock(&em_tree->lock);

1860
	if (em) {
1861
		if (em->start > start) {
1862 1863
			printk("get_extent lookup [%Lu %Lu] em [%Lu %Lu]\n",
			       start, len, em->start, em->len);
1864 1865
			WARN_ON(1);
		}
1866 1867
		goto out;
	}
1868
	em = alloc_extent_map(GFP_NOFS);
1869
	if (!em) {
1870 1871
		err = -ENOMEM;
		goto out;
1872
	}
1873 1874 1875

	em->start = EXTENT_MAP_HOLE;
	em->len = (u64)-1;
1876
	em->bdev = inode->i_sb->s_bdev;
1877 1878
	ret = btrfs_lookup_file_extent(trans, root, path,
				       objectid, start, trans != NULL);
1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889
	if (ret < 0) {
		err = ret;
		goto out;
	}

	if (ret != 0) {
		if (path->slots[0] == 0)
			goto not_found;
		path->slots[0]--;
	}

1890 1891
	leaf = path->nodes[0];
	item = btrfs_item_ptr(leaf, path->slots[0],
1892 1893
			      struct btrfs_file_extent_item);
	/* are we inside the extent that was found? */
1894 1895 1896
	btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
	found_type = btrfs_key_type(&found_key);
	if (found_key.objectid != objectid ||
1897 1898 1899 1900
	    found_type != BTRFS_EXTENT_DATA_KEY) {
		goto not_found;
	}

1901 1902
	found_type = btrfs_file_extent_type(leaf, item);
	extent_start = found_key.offset;
1903 1904
	if (found_type == BTRFS_FILE_EXTENT_REG) {
		extent_end = extent_start +
1905
		       btrfs_file_extent_num_bytes(leaf, item);
1906
		err = 0;
1907
		if (start < extent_start || start >= extent_end) {
1908 1909
			em->start = start;
			if (start < extent_start) {
1910
				if (start + len <= extent_start)
1911
					goto not_found;
1912
				em->len = extent_end - extent_start;
1913
			} else {
1914
				em->len = len;
1915 1916 1917
			}
			goto not_found_em;
		}
1918 1919
		bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
		if (bytenr == 0) {
1920
			em->start = extent_start;
1921
			em->len = extent_end - extent_start;
1922
			em->block_start = EXTENT_MAP_HOLE;
1923 1924
			goto insert;
		}
1925 1926
		bytenr += btrfs_file_extent_offset(leaf, item);
		em->block_start = bytenr;
1927
		em->start = extent_start;
1928
		em->len = extent_end - extent_start;
1929 1930
		goto insert;
	} else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
1931
		unsigned long ptr;
1932
		char *map;
1933 1934 1935
		size_t size;
		size_t extent_offset;
		size_t copy_size;
1936

1937 1938
		size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
						    path->slots[0]));
1939 1940
		extent_end = (extent_start + size + root->sectorsize - 1) &
			~((u64)root->sectorsize - 1);
1941
		if (start < extent_start || start >= extent_end) {
1942 1943
			em->start = start;
			if (start < extent_start) {
1944
				if (start + len <= extent_start)
1945
					goto not_found;
1946
				em->len = extent_end - extent_start;
1947
			} else {
1948
				em->len = len;
1949 1950 1951
			}
			goto not_found_em;
		}
1952 1953 1954 1955
		em->block_start = EXTENT_MAP_INLINE;

		if (!page) {
			em->start = extent_start;
1956
			em->len = size;
1957 1958
			goto out;
		}
1959

1960
		extent_offset = ((u64)page->index << PAGE_CACHE_SHIFT) -
1961
			extent_start + page_offset;
J
Jens Axboe 已提交
1962
		copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset,
1963 1964
				size - extent_offset);
		em->start = extent_start + extent_offset;
1965
		em->len = copy_size;
1966 1967
		map = kmap(page);
		ptr = btrfs_file_extent_inline_start(item) + extent_offset;
1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983
		if (create == 0 && !PageUptodate(page)) {
			read_extent_buffer(leaf, map + page_offset, ptr,
					   copy_size);
			flush_dcache_page(page);
		} else if (create && PageUptodate(page)) {
			if (!trans) {
				kunmap(page);
				free_extent_map(em);
				em = NULL;
				btrfs_release_path(root, path);
				trans = btrfs_start_transaction(root, 1);
				goto again;
			}
			write_extent_buffer(leaf, map + page_offset, ptr,
					    copy_size);
			btrfs_mark_buffer_dirty(leaf);
1984 1985
		}
		kunmap(page);
1986 1987
		set_extent_uptodate(io_tree, em->start,
				    extent_map_end(em) - 1, GFP_NOFS);
1988 1989 1990 1991 1992 1993 1994
		goto insert;
	} else {
		printk("unkknown found_type %d\n", found_type);
		WARN_ON(1);
	}
not_found:
	em->start = start;
1995
	em->len = len;
1996
not_found_em:
1997
	em->block_start = EXTENT_MAP_HOLE;
1998 1999
insert:
	btrfs_release_path(root, path);
2000 2001
	if (em->start > start || extent_map_end(em) <= start) {
		printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len);
2002 2003 2004
		err = -EIO;
		goto out;
	}
2005 2006 2007

	err = 0;
	spin_lock(&em_tree->lock);
2008 2009 2010
	ret = add_extent_mapping(em_tree, em);
	if (ret == -EEXIST) {
		free_extent_map(em);
2011 2012
		em = lookup_extent_mapping(em_tree, start, len);
		if (!em) {
2013
			err = -EIO;
2014
			printk("failing to insert %Lu %Lu\n", start, len);
2015 2016
		}
	}
2017
	spin_unlock(&em_tree->lock);
2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033
out:
	btrfs_free_path(path);
	if (trans) {
		ret = btrfs_end_transaction(trans, root);
		if (!err)
			err = ret;
	}
	mutex_unlock(&root->fs_info->fs_mutex);
	if (err) {
		free_extent_map(em);
		WARN_ON(1);
		return ERR_PTR(err);
	}
	return em;
}

2034
static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
C
Chris Mason 已提交
2035
{
2036
	return extent_bmap(mapping, iblock, btrfs_get_extent);
C
Chris Mason 已提交
2037 2038
}

2039
int btrfs_readpage(struct file *file, struct page *page)
C
Chris Mason 已提交
2040
{
2041 2042
	struct extent_io_tree *tree;
	tree = &BTRFS_I(page->mapping->host)->io_tree;
2043
	return extent_read_full_page(tree, page, btrfs_get_extent);
C
Chris Mason 已提交
2044
}
2045

2046
static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
C
Chris Mason 已提交
2047
{
2048
	struct extent_io_tree *tree;
2049 2050 2051 2052 2053 2054 2055


	if (current->flags & PF_MEMALLOC) {
		redirty_page_for_writepage(wbc, page);
		unlock_page(page);
		return 0;
	}
2056
	tree = &BTRFS_I(page->mapping->host)->io_tree;
2057
	return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
C
Chris Mason 已提交
2058 2059
}

C
Chris Mason 已提交
2060 2061 2062
static int btrfs_writepages(struct address_space *mapping,
			    struct writeback_control *wbc)
{
2063 2064
	struct extent_io_tree *tree;
	tree = &BTRFS_I(mapping->host)->io_tree;
C
Chris Mason 已提交
2065 2066 2067
	return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
}

C
Chris Mason 已提交
2068 2069 2070 2071
static int
btrfs_readpages(struct file *file, struct address_space *mapping,
		struct list_head *pages, unsigned nr_pages)
{
2072 2073
	struct extent_io_tree *tree;
	tree = &BTRFS_I(mapping->host)->io_tree;
C
Chris Mason 已提交
2074 2075 2076 2077
	return extent_readpages(tree, mapping, pages, nr_pages,
				btrfs_get_extent);
}

2078
static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
C
Chris Mason 已提交
2079
{
2080 2081
	struct extent_io_tree *tree;
	struct extent_map_tree *map;
2082
	int ret;
2083

2084 2085 2086
	tree = &BTRFS_I(page->mapping->host)->io_tree;
	map = &BTRFS_I(page->mapping->host)->extent_tree;
	ret = try_release_extent_mapping(map, tree, page);
2087 2088 2089 2090
	if (ret == 1) {
		ClearPagePrivate(page);
		set_page_private(page, 0);
		page_cache_release(page);
C
Chris Mason 已提交
2091
	}
2092
	return ret;
C
Chris Mason 已提交
2093 2094
}

2095
static void btrfs_invalidatepage(struct page *page, unsigned long offset)
C
Chris Mason 已提交
2096
{
2097
	struct extent_io_tree *tree;
C
Chris Mason 已提交
2098

2099
	tree = &BTRFS_I(page->mapping->host)->io_tree;
2100 2101
	extent_invalidatepage(tree, page, offset);
	btrfs_releasepage(page, GFP_NOFS);
C
Chris Mason 已提交
2102 2103
}

C
Chris Mason 已提交
2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120
/*
 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
 * called from a page fault handler when a page is first dirtied. Hence we must
 * be careful to check for EOF conditions here. We set the page up correctly
 * for a written page which means we get ENOSPC checking when writing into
 * holes and correct delalloc and unwritten extent mapping on filesystems that
 * support these features.
 *
 * We are not allowed to take the i_mutex here so we have to play games to
 * protect against truncate races as the page could now be beyond EOF.  Because
 * vmtruncate() writes the inode size before removing pages, once we have the
 * page lock we can determine safely if the page is beyond EOF. If it is not
 * beyond EOF, then the page is guaranteed safe against truncation until we
 * unlock the page.
 */
int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
{
2121
	struct inode *inode = fdentry(vma->vm_file)->d_inode;
2122
	struct btrfs_root *root = BTRFS_I(inode)->root;
C
Chris Mason 已提交
2123 2124
	unsigned long end;
	loff_t size;
2125
	int ret;
2126
	u64 page_start;
C
Chris Mason 已提交
2127

2128 2129
	mutex_lock(&root->fs_info->fs_mutex);
	ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
2130
	mutex_unlock(&root->fs_info->fs_mutex);
2131 2132 2133 2134 2135
	if (ret)
		goto out;

	ret = -EINVAL;

C
Chris Mason 已提交
2136 2137 2138
	lock_page(page);
	wait_on_page_writeback(page);
	size = i_size_read(inode);
2139
	page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2140

C
Chris Mason 已提交
2141
	if ((page->mapping != inode->i_mapping) ||
2142
	    (page_start > size)) {
C
Chris Mason 已提交
2143 2144 2145 2146 2147
		/* page got truncated out from underneath us */
		goto out_unlock;
	}

	/* page is wholly or partially inside EOF */
2148
	if (page_start + PAGE_CACHE_SIZE > size)
C
Chris Mason 已提交
2149 2150 2151 2152
		end = size & ~PAGE_CACHE_MASK;
	else
		end = PAGE_CACHE_SIZE;

2153
	ret = btrfs_cow_one_page(inode, page, end);
C
Chris Mason 已提交
2154 2155 2156

out_unlock:
	unlock_page(page);
2157
out:
C
Chris Mason 已提交
2158 2159 2160
	return ret;
}

C
Chris Mason 已提交
2161 2162 2163 2164 2165
static void btrfs_truncate(struct inode *inode)
{
	struct btrfs_root *root = BTRFS_I(inode)->root;
	int ret;
	struct btrfs_trans_handle *trans;
2166
	unsigned long nr;
C
Chris Mason 已提交
2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181

	if (!S_ISREG(inode->i_mode))
		return;
	if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
		return;

	btrfs_truncate_page(inode->i_mapping, inode->i_size);

	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);
	btrfs_update_inode(trans, root, inode);
2182
	nr = trans->blocks_used;
2183

C
Chris Mason 已提交
2184 2185 2186
	ret = btrfs_end_transaction(trans, root);
	BUG_ON(ret);
	mutex_unlock(&root->fs_info->fs_mutex);
2187
	btrfs_btree_balance_dirty(root, nr);
2188
	btrfs_throttle(root);
C
Chris Mason 已提交
2189 2190
}

2191 2192
static int noinline create_subvol(struct btrfs_root *root, char *name,
				  int namelen)
C
Chris Mason 已提交
2193 2194 2195 2196 2197
{
	struct btrfs_trans_handle *trans;
	struct btrfs_key key;
	struct btrfs_root_item root_item;
	struct btrfs_inode_item *inode_item;
2198
	struct extent_buffer *leaf;
C
Chris Mason 已提交
2199
	struct btrfs_root *new_root = root;
C
Chris Mason 已提交
2200 2201 2202
	struct inode *inode;
	struct inode *dir;
	int ret;
2203
	int err;
C
Chris Mason 已提交
2204 2205
	u64 objectid;
	u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
2206
	unsigned long nr = 1;
C
Chris Mason 已提交
2207 2208

	mutex_lock(&root->fs_info->fs_mutex);
2209 2210 2211 2212
	ret = btrfs_check_free_space(root, 1, 0);
	if (ret)
		goto fail_commit;

C
Chris Mason 已提交
2213 2214 2215
	trans = btrfs_start_transaction(root, 1);
	BUG_ON(!trans);

2216 2217 2218 2219 2220 2221 2222 2223
	ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
				       0, &objectid);
	if (ret)
		goto fail;

	leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
					objectid, trans->transid, 0, 0,
					0, 0);
2224 2225 2226 2227 2228
	if (IS_ERR(leaf))
		return PTR_ERR(leaf);

	btrfs_set_header_nritems(leaf, 0);
	btrfs_set_header_level(leaf, 0);
2229
	btrfs_set_header_bytenr(leaf, leaf->start);
2230
	btrfs_set_header_generation(leaf, trans->transid);
2231 2232
	btrfs_set_header_owner(leaf, objectid);

2233 2234 2235 2236
	write_extent_buffer(leaf, root->fs_info->fsid,
			    (unsigned long)btrfs_header_fsid(leaf),
			    BTRFS_FSID_SIZE);
	btrfs_mark_buffer_dirty(leaf);
C
Chris Mason 已提交
2237 2238 2239

	inode_item = &root_item.inode;
	memset(inode_item, 0, sizeof(*inode_item));
2240 2241 2242 2243 2244
	inode_item->generation = cpu_to_le64(1);
	inode_item->size = cpu_to_le64(3);
	inode_item->nlink = cpu_to_le32(1);
	inode_item->nblocks = cpu_to_le64(1);
	inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
C
Chris Mason 已提交
2245

2246 2247
	btrfs_set_root_bytenr(&root_item, leaf->start);
	btrfs_set_root_level(&root_item, 0);
C
Chris Mason 已提交
2248
	btrfs_set_root_refs(&root_item, 1);
2249 2250
	btrfs_set_root_used(&root_item, 0);

2251 2252
	memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
	root_item.drop_level = 0;
2253 2254 2255

	free_extent_buffer(leaf);
	leaf = NULL;
C
Chris Mason 已提交
2256 2257 2258 2259 2260 2261 2262 2263

	btrfs_set_root_dirid(&root_item, new_dirid);

	key.objectid = objectid;
	key.offset = 1;
	btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
	ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
				&root_item);
2264 2265
	if (ret)
		goto fail;
C
Chris Mason 已提交
2266 2267 2268 2269 2270 2271 2272 2273 2274

	/*
	 * 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, dir->i_ino, &key,
				    BTRFS_FT_DIR);
2275 2276
	if (ret)
		goto fail;
C
Chris Mason 已提交
2277

2278 2279 2280 2281 2282 2283
	ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
			     name, namelen, objectid,
			     root->fs_info->sb->s_root->d_inode->i_ino);
	if (ret)
		goto fail;

C
Chris Mason 已提交
2284
	ret = btrfs_commit_transaction(trans, root);
2285 2286
	if (ret)
		goto fail_commit;
C
Chris Mason 已提交
2287

2288
	new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
C
Chris Mason 已提交
2289 2290 2291 2292 2293 2294 2295
	BUG_ON(!new_root);

	trans = btrfs_start_transaction(new_root, 1);
	BUG_ON(!trans);

	inode = btrfs_new_inode(trans, new_root, new_dirid,
				BTRFS_I(dir)->block_group, S_IFDIR | 0700);
2296 2297
	if (IS_ERR(inode))
		goto fail;
C
Chris Mason 已提交
2298 2299
	inode->i_op = &btrfs_dir_inode_operations;
	inode->i_fop = &btrfs_dir_file_operations;
C
Chris Mason 已提交
2300
	new_root->inode = inode;
C
Chris Mason 已提交
2301

2302 2303
	ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
				     new_dirid);
C
Chris Mason 已提交
2304
	inode->i_nlink = 1;
2305
	inode->i_size = 0;
C
Chris Mason 已提交
2306
	ret = btrfs_update_inode(trans, new_root, inode);
2307 2308 2309
	if (ret)
		goto fail;
fail:
2310
	nr = trans->blocks_used;
C
Chris Mason 已提交
2311
	err = btrfs_commit_transaction(trans, new_root);
2312 2313 2314
	if (err && !ret)
		ret = err;
fail_commit:
C
Chris Mason 已提交
2315
	mutex_unlock(&root->fs_info->fs_mutex);
2316
	btrfs_btree_balance_dirty(root, nr);
2317
	btrfs_throttle(root);
2318
	return ret;
C
Chris Mason 已提交
2319 2320 2321 2322
}

static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
{
2323
	struct btrfs_pending_snapshot *pending_snapshot;
C
Chris Mason 已提交
2324 2325
	struct btrfs_trans_handle *trans;
	int ret;
2326
	int err;
2327
	unsigned long nr = 0;
C
Chris Mason 已提交
2328 2329 2330 2331 2332

	if (!root->ref_cows)
		return -EINVAL;

	mutex_lock(&root->fs_info->fs_mutex);
2333 2334 2335 2336
	ret = btrfs_check_free_space(root, 1, 0);
	if (ret)
		goto fail_unlock;

2337 2338 2339 2340 2341
	pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
	if (!pending_snapshot) {
		ret = -ENOMEM;
		goto fail_unlock;
	}
Y
Yan 已提交
2342
	pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
2343 2344 2345 2346 2347
	if (!pending_snapshot->name) {
		ret = -ENOMEM;
		kfree(pending_snapshot);
		goto fail_unlock;
	}
Y
Yan 已提交
2348 2349
	memcpy(pending_snapshot->name, name, namelen);
	pending_snapshot->name[namelen] = '\0';
C
Chris Mason 已提交
2350 2351
	trans = btrfs_start_transaction(root, 1);
	BUG_ON(!trans);
2352 2353 2354
	pending_snapshot->root = root;
	list_add(&pending_snapshot->list,
		 &trans->transaction->pending_snapshots);
C
Chris Mason 已提交
2355
	ret = btrfs_update_inode(trans, root, root->inode);
2356
	err = btrfs_commit_transaction(trans, root);
2357

2358
fail_unlock:
C
Chris Mason 已提交
2359
	mutex_unlock(&root->fs_info->fs_mutex);
2360
	btrfs_btree_balance_dirty(root, nr);
2361
	btrfs_throttle(root);
2362
	return ret;
C
Chris Mason 已提交
2363 2364
}

2365
unsigned long btrfs_force_ra(struct address_space *mapping,
2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382
			      struct file_ra_state *ra, struct file *file,
			      pgoff_t offset, pgoff_t last_index)
{
	pgoff_t req_size;

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
	req_size = last_index - offset + 1;
	offset = page_cache_readahead(mapping, ra, file, offset, req_size);
	return offset;
#else
	req_size = min(last_index - offset + 1, (pgoff_t)128);
	page_cache_sync_readahead(mapping, ra, file, offset, req_size);
	return offset + req_size;
#endif
}

int btrfs_defrag_file(struct file *file) {
2383
	struct inode *inode = fdentry(file)->d_inode;
2384
	struct btrfs_root *root = BTRFS_I(inode)->root;
2385
	struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2386 2387 2388 2389 2390
	struct page *page;
	unsigned long last_index;
	unsigned long ra_index = 0;
	u64 page_start;
	u64 page_end;
2391 2392
	u64 delalloc_start;
	u64 existing_delalloc;
2393
	unsigned long i;
2394 2395 2396 2397 2398 2399 2400
	int ret;

	mutex_lock(&root->fs_info->fs_mutex);
	ret = btrfs_check_free_space(root, inode->i_size, 0);
	mutex_unlock(&root->fs_info->fs_mutex);
	if (ret)
		return -ENOSPC;
2401 2402 2403 2404 2405

	mutex_lock(&inode->i_mutex);
	last_index = inode->i_size >> PAGE_CACHE_SHIFT;
	for (i = 0; i <= last_index; i++) {
		if (i == ra_index) {
2406 2407 2408
			ra_index = btrfs_force_ra(inode->i_mapping,
						  &file->f_ra,
						  file, ra_index, last_index);
2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421
		}
		page = grab_cache_page(inode->i_mapping, i);
		if (!page)
			goto out_unlock;
		if (!PageUptodate(page)) {
			btrfs_readpage(NULL, page);
			lock_page(page);
			if (!PageUptodate(page)) {
				unlock_page(page);
				page_cache_release(page);
				goto out_unlock;
			}
		}
2422
		page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2423 2424
		page_end = page_start + PAGE_CACHE_SIZE - 1;

2425
		lock_extent(io_tree, page_start, page_end, GFP_NOFS);
2426 2427
		delalloc_start = page_start;
		existing_delalloc =
2428
			count_range_bits(&BTRFS_I(inode)->io_tree,
2429 2430
					 &delalloc_start, page_end,
					 PAGE_CACHE_SIZE, EXTENT_DELALLOC);
2431
		set_extent_delalloc(io_tree, page_start,
2432
				    page_end, GFP_NOFS);
2433 2434 2435 2436 2437 2438

		spin_lock(&root->fs_info->delalloc_lock);
		root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE -
						 existing_delalloc;
		spin_unlock(&root->fs_info->delalloc_lock);

2439
		unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450
		set_page_dirty(page);
		unlock_page(page);
		page_cache_release(page);
		balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
	}

out_unlock:
	mutex_unlock(&inode->i_mutex);
	return 0;
}

2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515
static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
{
	u64 new_size;
	u64 old_size;
	struct btrfs_ioctl_vol_args *vol_args;
	struct btrfs_trans_handle *trans;
	char *sizestr;
	int ret = 0;
	int namelen;
	int mod = 0;

	vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);

	if (!vol_args)
		return -ENOMEM;

	if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
		ret = -EFAULT;
		goto out;
	}
	namelen = strlen(vol_args->name);
	if (namelen > BTRFS_VOL_NAME_MAX) {
		ret = -EINVAL;
		goto out;
	}

	sizestr = vol_args->name;
	if (!strcmp(sizestr, "max"))
		new_size = root->fs_info->sb->s_bdev->bd_inode->i_size;
	else {
		if (sizestr[0] == '-') {
			mod = -1;
			sizestr++;
		} else if (sizestr[0] == '+') {
			mod = 1;
			sizestr++;
		}
		new_size = btrfs_parse_size(sizestr);
		if (new_size == 0) {
			ret = -EINVAL;
			goto out;
		}
	}

	mutex_lock(&root->fs_info->fs_mutex);
	old_size = btrfs_super_total_bytes(&root->fs_info->super_copy);

	if (mod < 0) {
		if (new_size > old_size) {
			ret = -EINVAL;
			goto out_unlock;
		}
		new_size = old_size - new_size;
	} else if (mod > 0) {
		new_size = old_size + new_size;
	}

	if (new_size < 256 * 1024 * 1024) {
		ret = -EINVAL;
		goto out_unlock;
	}
	if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) {
		ret = -EFBIG;
		goto out_unlock;
	}
2516 2517 2518

	do_div(new_size, root->sectorsize);
	new_size *= root->sectorsize;
2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535

printk("new size is %Lu\n", new_size);
	if (new_size > old_size) {
		trans = btrfs_start_transaction(root, 1);
		ret = btrfs_grow_extent_tree(trans, root, new_size);
		btrfs_commit_transaction(trans, root);
	} else {
		ret = btrfs_shrink_extent_tree(root, new_size);
	}

out_unlock:
	mutex_unlock(&root->fs_info->fs_mutex);
out:
	kfree(vol_args);
	return ret;
}

2536 2537
static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root,
					    void __user *arg)
C
Chris Mason 已提交
2538
{
2539
	struct btrfs_ioctl_vol_args *vol_args;
C
Chris Mason 已提交
2540 2541 2542
	struct btrfs_dir_item *di;
	struct btrfs_path *path;
	u64 root_dirid;
2543 2544
	int namelen;
	int ret;
C
Chris Mason 已提交
2545

2546
	vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2547

2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564
	if (!vol_args)
		return -ENOMEM;

	if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
		ret = -EFAULT;
		goto out;
	}

	namelen = strlen(vol_args->name);
	if (namelen > BTRFS_VOL_NAME_MAX) {
		ret = -EINVAL;
		goto out;
	}
	if (strchr(vol_args->name, '/')) {
		ret = -EINVAL;
		goto out;
	}
C
Christoph Hellwig 已提交
2565 2566

	path = btrfs_alloc_path();
2567 2568 2569 2570
	if (!path) {
		ret = -ENOMEM;
		goto out;
	}
C
Christoph Hellwig 已提交
2571 2572 2573 2574 2575

	root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
	mutex_lock(&root->fs_info->fs_mutex);
	di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
			    path, root_dirid,
2576
			    vol_args->name, namelen, 0);
C
Christoph Hellwig 已提交
2577 2578
	mutex_unlock(&root->fs_info->fs_mutex);
	btrfs_free_path(path);
2579 2580 2581 2582 2583 2584 2585 2586 2587 2588

	if (di && !IS_ERR(di)) {
		ret = -EEXIST;
		goto out;
	}

	if (IS_ERR(di)) {
		ret = PTR_ERR(di);
		goto out;
	}
C
Christoph Hellwig 已提交
2589 2590

	if (root == root->fs_info->tree_root)
2591 2592 2593 2594 2595 2596
		ret = create_subvol(root, vol_args->name, namelen);
	else
		ret = create_snapshot(root, vol_args->name, namelen);
out:
	kfree(vol_args);
	return ret;
C
Christoph Hellwig 已提交
2597 2598 2599 2600
}

static int btrfs_ioctl_defrag(struct file *file)
{
2601
	struct inode *inode = fdentry(file)->d_inode;
C
Christoph Hellwig 已提交
2602 2603 2604 2605
	struct btrfs_root *root = BTRFS_I(inode)->root;

	switch (inode->i_mode & S_IFMT) {
	case S_IFDIR:
C
Chris Mason 已提交
2606
		mutex_lock(&root->fs_info->fs_mutex);
C
Christoph Hellwig 已提交
2607 2608
		btrfs_defrag_root(root, 0);
		btrfs_defrag_root(root->fs_info->extent_root, 0);
C
Chris Mason 已提交
2609 2610
		mutex_unlock(&root->fs_info->fs_mutex);
		break;
C
Christoph Hellwig 已提交
2611 2612 2613 2614 2615 2616 2617
	case S_IFREG:
		btrfs_defrag_file(file);
		break;
	}

	return 0;
}
2618

C
Christoph Hellwig 已提交
2619 2620 2621
long btrfs_ioctl(struct file *file, unsigned int
		cmd, unsigned long arg)
{
2622
	struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
C
Christoph Hellwig 已提交
2623 2624 2625 2626

	switch (cmd) {
	case BTRFS_IOC_SNAP_CREATE:
		return btrfs_ioctl_snap_create(root, (void __user *)arg);
2627
	case BTRFS_IOC_DEFRAG:
C
Christoph Hellwig 已提交
2628
		return btrfs_ioctl_defrag(file);
2629 2630
	case BTRFS_IOC_RESIZE:
		return btrfs_ioctl_resize(root, (void __user *)arg);
C
Chris Mason 已提交
2631
	}
C
Christoph Hellwig 已提交
2632 2633

	return -ENOTTY;
C
Chris Mason 已提交
2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645
}

/*
 * Called inside transaction, so use GFP_NOFS
 */
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;
2646
	ei->last_trans = 0;
C
Chris Mason 已提交
2647
	ei->ordered_trans = 0;
C
Chris Mason 已提交
2648 2649 2650 2651 2652 2653 2654 2655
	return &ei->vfs_inode;
}

void btrfs_destroy_inode(struct inode *inode)
{
	WARN_ON(!list_empty(&inode->i_dentry));
	WARN_ON(inode->i_data.nrpages);

2656
	btrfs_drop_extent_cache(inode, 0, (u64)-1);
C
Chris Mason 已提交
2657 2658 2659
	kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
}

2660 2661 2662
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
static void init_once(struct kmem_cache * cachep, void *foo)
#else
C
Chris Mason 已提交
2663 2664
static void init_once(void * foo, struct kmem_cache * cachep,
		      unsigned long flags)
2665
#endif
C
Chris Mason 已提交
2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685
{
	struct btrfs_inode *ei = (struct btrfs_inode *) foo;

	inode_init_once(&ei->vfs_inode);
}

void btrfs_destroy_cachep(void)
{
	if (btrfs_inode_cachep)
		kmem_cache_destroy(btrfs_inode_cachep);
	if (btrfs_trans_handle_cachep)
		kmem_cache_destroy(btrfs_trans_handle_cachep);
	if (btrfs_transaction_cachep)
		kmem_cache_destroy(btrfs_transaction_cachep);
	if (btrfs_bit_radix_cachep)
		kmem_cache_destroy(btrfs_bit_radix_cachep);
	if (btrfs_path_cachep)
		kmem_cache_destroy(btrfs_path_cachep);
}

2686
struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
2687
				       unsigned long extra_flags,
2688 2689 2690
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
				       void (*ctor)(struct kmem_cache *, void *)
#else
2691
				       void (*ctor)(void *, struct kmem_cache *,
2692 2693 2694
						    unsigned long)
#endif
				     )
2695 2696 2697 2698 2699 2700 2701 2702 2703
{
	return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
				 SLAB_MEM_SPREAD | extra_flags), ctor
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
				 ,NULL
#endif
				);
}

C
Chris Mason 已提交
2704 2705
int btrfs_init_cachep(void)
{
2706
	btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
2707 2708
					  sizeof(struct btrfs_inode),
					  0, init_once);
C
Chris Mason 已提交
2709 2710
	if (!btrfs_inode_cachep)
		goto fail;
2711 2712 2713 2714
	btrfs_trans_handle_cachep =
			btrfs_cache_create("btrfs_trans_handle_cache",
					   sizeof(struct btrfs_trans_handle),
					   0, NULL);
C
Chris Mason 已提交
2715 2716
	if (!btrfs_trans_handle_cachep)
		goto fail;
2717
	btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
C
Chris Mason 已提交
2718
					     sizeof(struct btrfs_transaction),
2719
					     0, NULL);
C
Chris Mason 已提交
2720 2721
	if (!btrfs_transaction_cachep)
		goto fail;
2722
	btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
2723
					 sizeof(struct btrfs_path),
2724
					 0, NULL);
C
Chris Mason 已提交
2725 2726
	if (!btrfs_path_cachep)
		goto fail;
2727
	btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
2728
					      SLAB_DESTROY_BY_RCU, NULL);
C
Chris Mason 已提交
2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741
	if (!btrfs_bit_radix_cachep)
		goto fail;
	return 0;
fail:
	btrfs_destroy_cachep();
	return -ENOMEM;
}

static int btrfs_getattr(struct vfsmount *mnt,
			 struct dentry *dentry, struct kstat *stat)
{
	struct inode *inode = dentry->d_inode;
	generic_fillattr(inode, stat);
C
Chris Mason 已提交
2742
	stat->blksize = PAGE_CACHE_SIZE;
C
Chris Mason 已提交
2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760
	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;
	int ret;

	if (S_ISDIR(old_inode->i_mode) && new_inode &&
	    new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
		return -ENOTEMPTY;
	}
2761

C
Chris Mason 已提交
2762
	mutex_lock(&root->fs_info->fs_mutex);
2763 2764 2765 2766
	ret = btrfs_check_free_space(root, 1, 0);
	if (ret)
		goto out_unlock;

C
Chris Mason 已提交
2767
	trans = btrfs_start_transaction(root, 1);
2768

C
Chris Mason 已提交
2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779
	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;
2780

C
Chris Mason 已提交
2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797
	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;
	}
	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);
2798
out_unlock:
C
Chris Mason 已提交
2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809
	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;
2810
	struct inode *inode = NULL;
C
Chris Mason 已提交
2811 2812 2813 2814 2815
	int err;
	int drop_inode = 0;
	u64 objectid;
	int name_len;
	int datasize;
2816
	unsigned long ptr;
C
Chris Mason 已提交
2817
	struct btrfs_file_extent_item *ei;
2818
	struct extent_buffer *leaf;
2819
	unsigned long nr = 0;
C
Chris Mason 已提交
2820 2821 2822 2823

	name_len = strlen(symname) + 1;
	if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
		return -ENAMETOOLONG;
2824

C
Chris Mason 已提交
2825
	mutex_lock(&root->fs_info->fs_mutex);
2826 2827 2828 2829
	err = btrfs_check_free_space(root, 1, 0);
	if (err)
		goto out_fail;

C
Chris Mason 已提交
2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852
	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;
2853 2854
		extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
		extent_io_tree_init(&BTRFS_I(inode)->io_tree,
2855
				     inode->i_mapping, GFP_NOFS);
2856
		BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
C
Chris Mason 已提交
2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871
	}
	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;
	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);
2872 2873 2874 2875
	if (err) {
		drop_inode = 1;
		goto out_unlock;
	}
2876 2877 2878 2879 2880
	leaf = path->nodes[0];
	ei = btrfs_item_ptr(leaf, path->slots[0],
			    struct btrfs_file_extent_item);
	btrfs_set_file_extent_generation(leaf, ei, trans->transid);
	btrfs_set_file_extent_type(leaf, ei,
C
Chris Mason 已提交
2881 2882
				   BTRFS_FILE_EXTENT_INLINE);
	ptr = btrfs_file_extent_inline_start(ei);
2883 2884
	write_extent_buffer(leaf, symname, ptr, name_len);
	btrfs_mark_buffer_dirty(leaf);
C
Chris Mason 已提交
2885
	btrfs_free_path(path);
2886

C
Chris Mason 已提交
2887 2888 2889
	inode->i_op = &btrfs_symlink_inode_operations;
	inode->i_mapping->a_ops = &btrfs_symlink_aops;
	inode->i_size = name_len - 1;
2890 2891 2892
	err = btrfs_update_inode(trans, root, inode);
	if (err)
		drop_inode = 1;
C
Chris Mason 已提交
2893 2894

out_unlock:
2895
	nr = trans->blocks_used;
C
Chris Mason 已提交
2896
	btrfs_end_transaction(trans, root);
2897
out_fail:
C
Chris Mason 已提交
2898 2899 2900 2901 2902
	mutex_unlock(&root->fs_info->fs_mutex);
	if (drop_inode) {
		inode_dec_link_count(inode);
		iput(inode);
	}
2903
	btrfs_btree_balance_dirty(root, nr);
2904
	btrfs_throttle(root);
C
Chris Mason 已提交
2905 2906
	return err;
}
Y
Yan 已提交
2907 2908 2909 2910 2911 2912 2913
static int btrfs_permission(struct inode *inode, int mask,
			    struct nameidata *nd)
{
	if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
		return -EACCES;
	return generic_permission(inode, mask, NULL);
}
C
Chris Mason 已提交
2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924

static struct inode_operations btrfs_dir_inode_operations = {
	.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,
J
Josef Bacik 已提交
2925
	.mknod		= btrfs_mknod,
J
Josef Bacik 已提交
2926 2927 2928 2929
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.listxattr	= btrfs_listxattr,
	.removexattr	= generic_removexattr,
Y
Yan 已提交
2930
	.permission	= btrfs_permission,
C
Chris Mason 已提交
2931 2932 2933
};
static struct inode_operations btrfs_dir_ro_inode_operations = {
	.lookup		= btrfs_lookup,
Y
Yan 已提交
2934
	.permission	= btrfs_permission,
C
Chris Mason 已提交
2935 2936 2937 2938 2939
};
static struct file_operations btrfs_dir_file_operations = {
	.llseek		= generic_file_llseek,
	.read		= generic_read_dir,
	.readdir	= btrfs_readdir,
C
Christoph Hellwig 已提交
2940
	.unlocked_ioctl	= btrfs_ioctl,
C
Chris Mason 已提交
2941
#ifdef CONFIG_COMPAT
C
Christoph Hellwig 已提交
2942
	.compat_ioctl	= btrfs_ioctl,
C
Chris Mason 已提交
2943 2944 2945
#endif
};

2946
static struct extent_io_ops btrfs_extent_io_ops = {
2947 2948 2949 2950 2951 2952
	.fill_delalloc = run_delalloc_range,
	.writepage_io_hook = btrfs_writepage_io_hook,
	.readpage_io_hook = btrfs_readpage_io_hook,
	.readpage_end_io_hook = btrfs_readpage_end_io_hook,
};

C
Chris Mason 已提交
2953 2954 2955
static struct address_space_operations btrfs_aops = {
	.readpage	= btrfs_readpage,
	.writepage	= btrfs_writepage,
C
Chris Mason 已提交
2956
	.writepages	= btrfs_writepages,
C
Chris Mason 已提交
2957
	.readpages	= btrfs_readpages,
C
Chris Mason 已提交
2958 2959
	.sync_page	= block_sync_page,
	.bmap		= btrfs_bmap,
2960 2961 2962
	.invalidatepage = btrfs_invalidatepage,
	.releasepage	= btrfs_releasepage,
	.set_page_dirty	= __set_page_dirty_nobuffers,
C
Chris Mason 已提交
2963 2964 2965 2966 2967
};

static struct address_space_operations btrfs_symlink_aops = {
	.readpage	= btrfs_readpage,
	.writepage	= btrfs_writepage,
C
Chris Mason 已提交
2968 2969
	.invalidatepage = btrfs_invalidatepage,
	.releasepage	= btrfs_releasepage,
C
Chris Mason 已提交
2970 2971 2972 2973 2974 2975
};

static struct inode_operations btrfs_file_inode_operations = {
	.truncate	= btrfs_truncate,
	.getattr	= btrfs_getattr,
	.setattr	= btrfs_setattr,
J
Josef Bacik 已提交
2976 2977 2978 2979
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.listxattr      = btrfs_listxattr,
	.removexattr	= generic_removexattr,
Y
Yan 已提交
2980
	.permission	= btrfs_permission,
C
Chris Mason 已提交
2981
};
J
Josef Bacik 已提交
2982 2983 2984
static struct inode_operations btrfs_special_inode_operations = {
	.getattr	= btrfs_getattr,
	.setattr	= btrfs_setattr,
Y
Yan 已提交
2985
	.permission	= btrfs_permission,
J
Josef Bacik 已提交
2986
};
C
Chris Mason 已提交
2987 2988 2989 2990
static struct inode_operations btrfs_symlink_inode_operations = {
	.readlink	= generic_readlink,
	.follow_link	= page_follow_link_light,
	.put_link	= page_put_link,
Y
Yan 已提交
2991
	.permission	= btrfs_permission,
C
Chris Mason 已提交
2992
};