From 1a63143dc18b2c6a2233d1c5afce95205d2676f4 Mon Sep 17 00:00:00 2001 From: Hans van Kranenburg Date: Tue, 6 Jun 2017 00:20:32 +0200 Subject: [PATCH] Btrfs: btrfs_ioctl_search_key documentation A programmer who is trying to implement calling the btrfs SEARCH or SEARCH_V2 ioctl will probably soon end up reading this struct definition. Properly document the input fields to prevent common misconceptions: 1. The search space is linear, not 3 dimensional. The invidual min/max values for objectid, type and offset cannot be used to filter the result, they only define the endpoints of an interval. 2. The transaction id (a.k.a. generation) filter applies only on transaction id of the last COW operation on a whole metadata page, not on individual items. Ad 1. The first misunderstanding was helped by the previous misleading comments on min/max type and offset: "keys returned will be >= min and <= max". Ad 2. For example, running btrfs balance will happily cause rewriting of metadata pages that contain a filesystem tree of a read only subvolume, causing transids to be increased. Also, improve descriptions of tree_id and nr_items and add in/out annotations. Signed-off-by: Hans van Kranenburg Signed-off-by: David Sterba --- include/uapi/linux/btrfs.h | 63 ++++++++++++++++++++++++++------------ 1 file changed, 43 insertions(+), 20 deletions(-) diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h index a456e5309238..9aa74f317747 100644 --- a/include/uapi/linux/btrfs.h +++ b/include/uapi/linux/btrfs.h @@ -426,31 +426,54 @@ struct btrfs_ioctl_ino_lookup_args { char name[BTRFS_INO_LOOKUP_PATH_MAX]; }; +/* Search criteria for the btrfs SEARCH ioctl family. */ struct btrfs_ioctl_search_key { - /* which root are we searching. 0 is the tree of tree roots */ - __u64 tree_id; - - /* keys returned will be >= min and <= max */ - __u64 min_objectid; - __u64 max_objectid; - - /* keys returned will be >= min and <= max */ - __u64 min_offset; - __u64 max_offset; - - /* max and min transids to search for */ - __u64 min_transid; - __u64 max_transid; + /* + * The tree we're searching in. 1 is the tree of tree roots, 2 is the + * extent tree, etc... + * + * A special tree_id value of 0 will cause a search in the subvolume + * tree that the inode which is passed to the ioctl is part of. + */ + __u64 tree_id; /* in */ - /* keys returned will be >= min and <= max */ - __u32 min_type; - __u32 max_type; + /* + * When doing a tree search, we're actually taking a slice from a + * linear search space of 136-bit keys. + * + * A full 136-bit tree key is composed as: + * (objectid << 72) + (type << 64) + offset + * + * The individual min and max values for objectid, type and offset + * define the min_key and max_key values for the search range. All + * metadata items with a key in the interval [min_key, max_key] will be + * returned. + * + * Additionally, we can filter the items returned on transaction id of + * the metadata block they're stored in by specifying a transid range. + * Be aware that this transaction id only denotes when the metadata + * page that currently contains the item got written the last time as + * result of a COW operation. The number does not have any meaning + * related to the transaction in which an individual item that is being + * returned was created or changed. + */ + __u64 min_objectid; /* in */ + __u64 max_objectid; /* in */ + __u64 min_offset; /* in */ + __u64 max_offset; /* in */ + __u64 min_transid; /* in */ + __u64 max_transid; /* in */ + __u32 min_type; /* in */ + __u32 max_type; /* in */ /* - * how many items did userland ask for, and how many are we - * returning + * input: The maximum amount of results desired. + * output: The actual amount of items returned, restricted by any of: + * - reaching the upper bound of the search range + * - reaching the input nr_items amount of items + * - completely filling the supplied memory buffer */ - __u32 nr_items; + __u32 nr_items; /* in/out */ /* align to 64 bits */ __u32 unused; -- 2.30.2