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-rw-r--r--fs/btrfs/ioctl.c45
-rw-r--r--fs/btrfs/ioctl.h14
2 files changed, 58 insertions, 1 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 9aaba6e..9213d39 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1843,6 +1843,49 @@ static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
return 0;
}
+long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
+{
+ struct btrfs_ioctl_space_args space_args;
+ struct btrfs_ioctl_space_info space;
+ struct btrfs_ioctl_space_info *dest;
+ struct btrfs_space_info *info;
+ int ret = 0;
+
+ if (copy_from_user(&space_args,
+ (struct btrfs_ioctl_space_args __user *)arg,
+ sizeof(space_args)))
+ return -EFAULT;
+
+ space_args.total_spaces = 0;
+ dest = (struct btrfs_ioctl_space_info *)
+ (arg + sizeof(struct btrfs_ioctl_space_args));
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(info, &root->fs_info->space_info, list) {
+ if (!space_args.space_slots) {
+ space_args.total_spaces++;
+ continue;
+ }
+ if (space_args.total_spaces >= space_args.space_slots)
+ break;
+ space.flags = info->flags;
+ space.total_bytes = info->total_bytes;
+ space.used_bytes = info->bytes_used;
+ if (copy_to_user(dest, &space, sizeof(space))) {
+ ret = -EFAULT;
+ break;
+ }
+ dest++;
+ space_args.total_spaces++;
+ }
+ rcu_read_unlock();
+
+ if (copy_to_user(arg, &space_args, sizeof(space_args)))
+ ret = -EFAULT;
+
+ return ret;
+}
+
/*
* there are many ways the trans_start and trans_end ioctls can lead
* to deadlocks. They should only be used by applications that
@@ -1915,6 +1958,8 @@ long btrfs_ioctl(struct file *file, unsigned int
return btrfs_ioctl_tree_search(file, argp);
case BTRFS_IOC_INO_LOOKUP:
return btrfs_ioctl_ino_lookup(file, argp);
+ case BTRFS_IOC_SPACE_INFO:
+ return btrfs_ioctl_space_info(root, argp);
case BTRFS_IOC_SYNC:
btrfs_sync_fs(file->f_dentry->d_sb, 1);
return 0;
diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h
index 2d64a65..81eac0a 100644
--- a/fs/btrfs/ioctl.h
+++ b/fs/btrfs/ioctl.h
@@ -1,4 +1,3 @@
-
/*
* Copyright (C) 2007 Oracle. All rights reserved.
*
@@ -127,6 +126,17 @@ struct btrfs_ioctl_defrag_range_args {
__u32 unused[5];
};
+struct btrfs_ioctl_space_info {
+ u64 flags;
+ u64 total_bytes;
+ u64 used_bytes;
+};
+
+struct btrfs_ioctl_space_args {
+ u64 space_slots;
+ u64 total_spaces;
+ struct btrfs_ioctl_space_info spaces[0];
+};
#define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
struct btrfs_ioctl_vol_args)
@@ -166,4 +176,6 @@ struct btrfs_ioctl_defrag_range_args {
#define BTRFS_IOC_INO_LOOKUP _IOWR(BTRFS_IOCTL_MAGIC, 18, \
struct btrfs_ioctl_ino_lookup_args)
#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)
#endif
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