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Commit 11bcac89 authored by Chris Mason's avatar Chris Mason
Browse files

Revert "btrfs: add ioctl to export size of global metadata reservation" 



This reverts commit 01e219e8.

David Sterba found a different way to provide these features without adding a new
ioctl.  We haven't released any progs with this ioctl yet, so I'm taking this out
for now until we finalize things.

Signed-off-by: default avatarChris Mason <clm@fb.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.cz>
CC: Jeff Mahoney <jeffm@suse.com>
parent a2aa75e1

fs/btrfs/ioctl.c

+0 −16
Original line number Diff line number Diff line
@@ -3559,20 +3559,6 @@ static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 
	return ret;

}



static long btrfs_ioctl_global_rsv(struct btrfs_root *root, void __user *arg)

{

	struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv;

	u64 reserved;



	spin_lock(&block_rsv->lock);

	reserved = block_rsv->reserved;

	spin_unlock(&block_rsv->lock);



	if (arg && copy_to_user(arg, &reserved, sizeof(reserved)))

		return -EFAULT;

	return 0;

}



/*

 * there are many ways the trans_start and trans_end ioctls can lead

 * to deadlocks.  They should only be used by applications that
@@ -4779,8 +4765,6 @@ long btrfs_ioctl(struct file *file, unsigned int 
		return btrfs_ioctl_logical_to_ino(root, argp);

	case BTRFS_IOC_SPACE_INFO:

		return btrfs_ioctl_space_info(root, argp);

	case BTRFS_IOC_GLOBAL_RSV:

		return btrfs_ioctl_global_rsv(root, argp);

	case BTRFS_IOC_SYNC: {

		int ret;

include/uapi/linux/btrfs.h

+0 −1
Original line number Diff line number Diff line
@@ -558,7 +558,6 @@ static inline char *btrfs_err_str(enum btrfs_err_code err_code) 
#define BTRFS_IOC_DEFAULT_SUBVOL _IOW(BTRFS_IOCTL_MAGIC, 19, __u64)

#define BTRFS_IOC_SPACE_INFO _IOWR(BTRFS_IOCTL_MAGIC, 20, \

				    struct btrfs_ioctl_space_args)

#define BTRFS_IOC_GLOBAL_RSV _IOR(BTRFS_IOCTL_MAGIC, 20, __u64)

#define BTRFS_IOC_START_SYNC _IOR(BTRFS_IOCTL_MAGIC, 24, __u64)

#define BTRFS_IOC_WAIT_SYNC  _IOW(BTRFS_IOCTL_MAGIC, 22, __u64)

#define BTRFS_IOC_SNAP_CREATE_V2 _IOW(BTRFS_IOCTL_MAGIC, 23, \