ac8e9819d7
The search ioctl is a generic tool for doing btree searches from userland applications. The first user of the search ioctl is a subvolume listing feature, but we'll also use it to find new files in a subvolume. The search ioctl allows you to specify min and max keys to search for, along with min and max transid. It returns the items along with a header that includes the item key. Signed-off-by: Chris Mason <chris.mason@oracle.com>
136 lines
3.8 KiB
C
136 lines
3.8 KiB
C
/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef __IOCTL_
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#define __IOCTL_
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#include <linux/ioctl.h>
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#define BTRFS_IOCTL_MAGIC 0x94
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#define BTRFS_VOL_NAME_MAX 255
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#define BTRFS_PATH_NAME_MAX 4087
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/* this should be 4k */
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struct btrfs_ioctl_vol_args {
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__s64 fd;
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char name[BTRFS_PATH_NAME_MAX + 1];
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};
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#define BTRFS_INO_LOOKUP_PATH_MAX 4080
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struct btrfs_ioctl_ino_lookup_args {
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__u64 treeid;
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__u64 objectid;
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char name[BTRFS_INO_LOOKUP_PATH_MAX];
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};
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struct btrfs_ioctl_search_key {
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/* which root are we searching. 0 is the tree of tree roots */
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__u64 tree_id;
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/* keys returned will be >= min and <= max */
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__u64 min_objectid;
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__u64 max_objectid;
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/* keys returned will be >= min and <= max */
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__u64 min_offset;
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__u64 max_offset;
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/* max and min transids to search for */
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__u64 min_transid;
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__u64 max_transid;
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/* keys returned will be >= min and <= max */
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__u32 min_type;
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__u32 max_type;
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/*
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* how many items did userland ask for, and how many are we
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* returning
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*/
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__u32 nr_items;
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/* align to 64 bits */
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__u32 unused;
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/* some extra for later */
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__u64 unused1;
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__u64 unused2;
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__u64 unused3;
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__u64 unused4;
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};
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struct btrfs_ioctl_search_header {
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__u64 transid;
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__u64 objectid;
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__u64 offset;
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__u32 type;
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__u32 len;
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};
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#define BTRFS_SEARCH_ARGS_BUFSIZE (4096 - sizeof(struct btrfs_ioctl_search_key))
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/*
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* the buf is an array of search headers where
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* each header is followed by the actual item
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* the type field is expanded to 32 bits for alignment
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*/
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struct btrfs_ioctl_search_args {
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struct btrfs_ioctl_search_key key;
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char buf[BTRFS_SEARCH_ARGS_BUFSIZE];
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};
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struct btrfs_ioctl_clone_range_args {
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__s64 src_fd;
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__u64 src_offset, src_length;
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__u64 dest_offset;
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};
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#define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
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struct btrfs_ioctl_vol_args)
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#define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
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struct btrfs_ioctl_vol_args)
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#define BTRFS_IOC_RESIZE _IOW(BTRFS_IOCTL_MAGIC, 3, \
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struct btrfs_ioctl_vol_args)
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#define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 4, \
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struct btrfs_ioctl_vol_args)
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/* trans start and trans end are dangerous, and only for
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* use by applications that know how to avoid the
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* resulting deadlocks
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*/
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#define BTRFS_IOC_TRANS_START _IO(BTRFS_IOCTL_MAGIC, 6)
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#define BTRFS_IOC_TRANS_END _IO(BTRFS_IOCTL_MAGIC, 7)
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#define BTRFS_IOC_SYNC _IO(BTRFS_IOCTL_MAGIC, 8)
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#define BTRFS_IOC_CLONE _IOW(BTRFS_IOCTL_MAGIC, 9, int)
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#define BTRFS_IOC_ADD_DEV _IOW(BTRFS_IOCTL_MAGIC, 10, \
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struct btrfs_ioctl_vol_args)
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#define BTRFS_IOC_RM_DEV _IOW(BTRFS_IOCTL_MAGIC, 11, \
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struct btrfs_ioctl_vol_args)
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#define BTRFS_IOC_BALANCE _IOW(BTRFS_IOCTL_MAGIC, 12, \
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struct btrfs_ioctl_vol_args)
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#define BTRFS_IOC_CLONE_RANGE _IOW(BTRFS_IOCTL_MAGIC, 13, \
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struct btrfs_ioctl_clone_range_args)
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#define BTRFS_IOC_SUBVOL_CREATE _IOW(BTRFS_IOCTL_MAGIC, 14, \
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struct btrfs_ioctl_vol_args)
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#define BTRFS_IOC_SNAP_DESTROY _IOW(BTRFS_IOCTL_MAGIC, 15, \
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struct btrfs_ioctl_vol_args)
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#define BTRFS_IOC_TREE_SEARCH _IOWR(BTRFS_IOCTL_MAGIC, 17, \
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struct btrfs_ioctl_search_args)
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#define BTRFS_IOC_INO_LOOKUP _IOWR(BTRFS_IOCTL_MAGIC, 18, \
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struct btrfs_ioctl_ino_lookup_args)
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#endif
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