forked from luck/tmp_suning_uos_patched
d24a10b9f8
This new code is a bit more complicated than former ones, the goal is to
show user all statistics required to take a deep insight into filesystem
on how the disk is being fragmentaed.
The goal is achieved by scaning global bitmap from (cluster)group to group
to figure out following factors in the filesystem:
- How many free chunks in a fixed size as user requested.
- How many real free chunks in all size.
- Min/Max/Avg size(in) clusters of free chunks.
- How do free chunks distribute(in size) in terms of a histogram,
just like following:
---------------------------------------------------------
Extent Size Range : Free extents Free Clusters Percent
32K... 64K- : 1 1 0.00%
1M... 2M- : 9 288 0.03%
8M... 16M- : 2 831 0.09%
32M... 64M- : 1 2047 0.23%
128M... 256M- : 1 8191 0.92%
256M... 512M- : 2 21706 2.43%
512M... 1024M- : 27 858623 96.29%
---------------------------------------------------------
Userspace ioctl() call eventually gets the above info returned by passing
a 'struct ocfs2_info_freefrag' with the chunk_size being specified first.
Signed-off-by: Tristan Ye <tristan.ye@oracle.com>
209 lines
5.8 KiB
C
209 lines
5.8 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* ocfs2_ioctl.h
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*
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* Defines OCFS2 ioctls.
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*
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* Copyright (C) 2010 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, version 2, 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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#ifndef OCFS2_IOCTL_H
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#define OCFS2_IOCTL_H
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/*
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* ioctl commands
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*/
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#define OCFS2_IOC_GETFLAGS FS_IOC_GETFLAGS
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#define OCFS2_IOC_SETFLAGS FS_IOC_SETFLAGS
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#define OCFS2_IOC32_GETFLAGS FS_IOC32_GETFLAGS
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#define OCFS2_IOC32_SETFLAGS FS_IOC32_SETFLAGS
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/*
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* Space reservation / allocation / free ioctls and argument structure
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* are designed to be compatible with XFS.
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*
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* ALLOCSP* and FREESP* are not and will never be supported, but are
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* included here for completeness.
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*/
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struct ocfs2_space_resv {
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__s16 l_type;
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__s16 l_whence;
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__s64 l_start;
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__s64 l_len; /* len == 0 means until end of file */
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__s32 l_sysid;
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__u32 l_pid;
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__s32 l_pad[4]; /* reserve area */
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};
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#define OCFS2_IOC_ALLOCSP _IOW ('X', 10, struct ocfs2_space_resv)
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#define OCFS2_IOC_FREESP _IOW ('X', 11, struct ocfs2_space_resv)
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#define OCFS2_IOC_RESVSP _IOW ('X', 40, struct ocfs2_space_resv)
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#define OCFS2_IOC_UNRESVSP _IOW ('X', 41, struct ocfs2_space_resv)
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#define OCFS2_IOC_ALLOCSP64 _IOW ('X', 36, struct ocfs2_space_resv)
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#define OCFS2_IOC_FREESP64 _IOW ('X', 37, struct ocfs2_space_resv)
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#define OCFS2_IOC_RESVSP64 _IOW ('X', 42, struct ocfs2_space_resv)
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#define OCFS2_IOC_UNRESVSP64 _IOW ('X', 43, struct ocfs2_space_resv)
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/* Used to pass group descriptor data when online resize is done */
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struct ocfs2_new_group_input {
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__u64 group; /* Group descriptor's blkno. */
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__u32 clusters; /* Total number of clusters in this group */
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__u32 frees; /* Total free clusters in this group */
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__u16 chain; /* Chain for this group */
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__u16 reserved1;
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__u32 reserved2;
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};
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#define OCFS2_IOC_GROUP_EXTEND _IOW('o', 1, int)
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#define OCFS2_IOC_GROUP_ADD _IOW('o', 2,struct ocfs2_new_group_input)
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#define OCFS2_IOC_GROUP_ADD64 _IOW('o', 3,struct ocfs2_new_group_input)
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/* Used to pass 2 file names to reflink. */
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struct reflink_arguments {
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__u64 old_path;
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__u64 new_path;
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__u64 preserve;
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};
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#define OCFS2_IOC_REFLINK _IOW('o', 4, struct reflink_arguments)
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/* Following definitions dedicated for ocfs2_info_request ioctls. */
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#define OCFS2_INFO_MAX_REQUEST (50)
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#define OCFS2_TEXT_UUID_LEN (OCFS2_VOL_UUID_LEN * 2)
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/* Magic number of all requests */
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#define OCFS2_INFO_MAGIC (0x4F32494E)
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/*
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* Always try to separate info request into small pieces to
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* guarantee the backward&forward compatibility.
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*/
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struct ocfs2_info {
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__u64 oi_requests; /* Array of __u64 pointers to requests */
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__u32 oi_count; /* Number of requests in info_requests */
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__u32 oi_pad;
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};
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struct ocfs2_info_request {
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/*00*/ __u32 ir_magic; /* Magic number */
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__u32 ir_code; /* Info request code */
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__u32 ir_size; /* Size of request */
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__u32 ir_flags; /* Request flags */
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/*10*/ /* Request specific fields */
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};
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struct ocfs2_info_clustersize {
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struct ocfs2_info_request ic_req;
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__u32 ic_clustersize;
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__u32 ic_pad;
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};
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struct ocfs2_info_blocksize {
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struct ocfs2_info_request ib_req;
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__u32 ib_blocksize;
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__u32 ib_pad;
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};
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struct ocfs2_info_maxslots {
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struct ocfs2_info_request im_req;
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__u32 im_max_slots;
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__u32 im_pad;
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};
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struct ocfs2_info_label {
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struct ocfs2_info_request il_req;
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__u8 il_label[OCFS2_MAX_VOL_LABEL_LEN];
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} __attribute__ ((packed));
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struct ocfs2_info_uuid {
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struct ocfs2_info_request iu_req;
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__u8 iu_uuid_str[OCFS2_TEXT_UUID_LEN + 1];
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} __attribute__ ((packed));
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struct ocfs2_info_fs_features {
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struct ocfs2_info_request if_req;
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__u32 if_compat_features;
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__u32 if_incompat_features;
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__u32 if_ro_compat_features;
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__u32 if_pad;
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};
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struct ocfs2_info_journal_size {
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struct ocfs2_info_request ij_req;
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__u64 ij_journal_size;
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};
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struct ocfs2_info_freeinode {
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struct ocfs2_info_request ifi_req;
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struct ocfs2_info_local_freeinode {
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__u64 lfi_total;
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__u64 lfi_free;
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} ifi_stat[OCFS2_MAX_SLOTS];
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__u32 ifi_slotnum; /* out */
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__u32 ifi_pad;
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};
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#define OCFS2_INFO_MAX_HIST (32)
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struct ocfs2_info_freefrag {
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struct ocfs2_info_request iff_req;
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struct ocfs2_info_freefrag_stats { /* (out) */
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struct ocfs2_info_free_chunk_list {
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__u32 fc_chunks[OCFS2_INFO_MAX_HIST];
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__u32 fc_clusters[OCFS2_INFO_MAX_HIST];
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} ffs_fc_hist;
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__u32 ffs_clusters;
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__u32 ffs_free_clusters;
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__u32 ffs_free_chunks;
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__u32 ffs_free_chunks_real;
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__u32 ffs_min; /* Minimum free chunksize in clusters */
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__u32 ffs_max;
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__u32 ffs_avg;
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__u32 ffs_pad;
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} iff_ffs;
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__u32 iff_chunksize; /* chunksize in clusters(in) */
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__u32 iff_pad;
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};
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/* Codes for ocfs2_info_request */
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enum ocfs2_info_type {
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OCFS2_INFO_CLUSTERSIZE = 1,
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OCFS2_INFO_BLOCKSIZE,
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OCFS2_INFO_MAXSLOTS,
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OCFS2_INFO_LABEL,
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OCFS2_INFO_UUID,
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OCFS2_INFO_FS_FEATURES,
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OCFS2_INFO_JOURNAL_SIZE,
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OCFS2_INFO_FREEINODE,
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OCFS2_INFO_FREEFRAG,
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OCFS2_INFO_NUM_TYPES
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};
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/* Flags for struct ocfs2_info_request */
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/* Filled by the caller */
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#define OCFS2_INFO_FL_NON_COHERENT (0x00000001) /* Cluster coherency not
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required. This is a hint.
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It is up to ocfs2 whether
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the request can be fulfilled
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without locking. */
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/* Filled by ocfs2 */
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#define OCFS2_INFO_FL_FILLED (0x40000000) /* Filesystem understood
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this request and
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filled in the answer */
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#define OCFS2_INFO_FL_ERROR (0x80000000) /* Error happened during
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request handling. */
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#define OCFS2_IOC_INFO _IOR('o', 5, struct ocfs2_info)
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#endif /* OCFS2_IOCTL_H */
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