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Commit 2b3909f8 authored by Darrick J. Wong's avatar Darrick J. Wong Committed by Al Viro
Browse files

btrfs: use new dedupe data function pointer 



Now that the VFS encapsulates the dedupe ioctl, wire up btrfs to it.

Signed-off-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 54dbc151

fs/btrfs/ctree.h

+2 −0
Original line number Diff line number Diff line
@@ -4024,6 +4024,8 @@ void btrfs_get_block_group_info(struct list_head *groups_list, 
				struct btrfs_ioctl_space_info *space);

void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,

			       struct btrfs_ioctl_balance_args *bargs);

ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen,

			   struct file *dst_file, u64 dst_loff);



/* file.c */

int btrfs_auto_defrag_init(void);

fs/btrfs/file.c

+1 −0
Original line number Diff line number Diff line
@@ -2926,6 +2926,7 @@ const struct file_operations btrfs_file_operations = { 
#endif

	.copy_file_range = btrfs_copy_file_range,

	.clone_file_range = btrfs_clone_file_range,

	.dedupe_file_range = btrfs_dedupe_file_range,

};



void btrfs_auto_defrag_exit(void)

fs/btrfs/ioctl.c

+13 −97
Original line number Diff line number Diff line
@@ -2962,7 +2962,7 @@ static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, 
		flush_dcache_page(dst_page);



		if (memcmp(addr, dst_addr, cmp_len))

			ret = BTRFS_SAME_DATA_DIFFERS;

			ret = -EBADE;



		kunmap_atomic(addr);

		kunmap_atomic(dst_addr);
@@ -3098,53 +3098,16 @@ static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen, 


#define BTRFS_MAX_DEDUPE_LEN	(16 * 1024 * 1024)



static long btrfs_ioctl_file_extent_same(struct file *file,

			struct btrfs_ioctl_same_args __user *argp)

ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen,

				struct file *dst_file, u64 dst_loff)

{

	struct btrfs_ioctl_same_args *same = NULL;

	struct btrfs_ioctl_same_extent_info *info;

	struct inode *src = file_inode(file);

	u64 off;

	u64 len;

	int i;

	int ret;

	unsigned long size;

	struct inode *src = file_inode(src_file);

	struct inode *dst = file_inode(dst_file);

	u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;

	bool is_admin = capable(CAP_SYS_ADMIN);

	u16 count;



	if (!(file->f_mode & FMODE_READ))

		return -EINVAL;

	ssize_t res;



	ret = mnt_want_write_file(file);

	if (ret)

		return ret;



	if (get_user(count, &argp->dest_count)) {

		ret = -EFAULT;

		goto out;

	}



	size = offsetof(struct btrfs_ioctl_same_args __user, info[count]);



	same = memdup_user(argp, size);



	if (IS_ERR(same)) {

		ret = PTR_ERR(same);

		same = NULL;

		goto out;

	}



	off = same->logical_offset;

	len = same->length;



	/*

	 * Limit the total length we will dedupe for each operation.

	 * This is intended to bound the total time spent in this

	 * ioctl to something sane.

	 */

	if (len > BTRFS_MAX_DEDUPE_LEN)

		len = BTRFS_MAX_DEDUPE_LEN;

	if (olen > BTRFS_MAX_DEDUPE_LEN)

		olen = BTRFS_MAX_DEDUPE_LEN;



	if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) {

		/*
@@ -3152,58 +3115,13 @@ static long btrfs_ioctl_file_extent_same(struct file *file, 
		 * result, btrfs_cmp_data() won't correctly handle

		 * this situation without an update.

		 */

		ret = -EINVAL;

		goto out;

	}



	ret = -EISDIR;

	if (S_ISDIR(src->i_mode))

		goto out;



	ret = -EACCES;

	if (!S_ISREG(src->i_mode))

		goto out;



	/* pre-format output fields to sane values */

	for (i = 0; i < count; i++) {

		same->info[i].bytes_deduped = 0ULL;

		same->info[i].status = 0;

	}



	for (i = 0, info = same->info; i < count; i++, info++) {

		struct inode *dst;

		struct fd dst_file = fdget(info->fd);

		if (!dst_file.file) {

			info->status = -EBADF;

			continue;

		}

		dst = file_inode(dst_file.file);



		if (!(is_admin || (dst_file.file->f_mode & FMODE_WRITE))) {

			info->status = -EINVAL;

		} else if (file->f_path.mnt != dst_file.file->f_path.mnt) {

			info->status = -EXDEV;

		} else if (S_ISDIR(dst->i_mode)) {

			info->status = -EISDIR;

		} else if (!S_ISREG(dst->i_mode)) {

			info->status = -EACCES;

		} else {

			info->status = btrfs_extent_same(src, off, len, dst,

							info->logical_offset);

			if (info->status == 0)

				info->bytes_deduped += len;

		}

		fdput(dst_file);

		return -EINVAL;

	}



	ret = copy_to_user(argp, same, size);

	if (ret)

		ret = -EFAULT;



out:

	mnt_drop_write_file(file);

	kfree(same);

	return ret;

	res = btrfs_extent_same(src, loff, olen, dst, dst_loff);

	if (res)

		return res;

	return olen;

}



static int clone_finish_inode_update(struct btrfs_trans_handle *trans,
@@ -5536,8 +5454,6 @@ long btrfs_ioctl(struct file *file, unsigned int 
		return btrfs_ioctl_get_fslabel(file, argp);

	case BTRFS_IOC_SET_FSLABEL:

		return btrfs_ioctl_set_fslabel(file, argp);

	case BTRFS_IOC_FILE_EXTENT_SAME:

		return btrfs_ioctl_file_extent_same(file, argp);

	case BTRFS_IOC_GET_SUPPORTED_FEATURES:

		return btrfs_ioctl_get_supported_features(file, argp);

	case BTRFS_IOC_GET_FEATURES: