Commit 3e5db17d authored by Tristan Ye's avatar Tristan Ye
Browse files

Ocfs2: Add a new code 'OCFS2_INFO_FREEINODE' for o2info ioctl. 



The new code is dedicated to calculate free inodes number of all inode_allocs,
then return the info to userpace in terms of an array.

Specially, flag 'OCFS2_INFO_FL_NON_COHERENT', manipulated by '--cluster-coherent'
from userspace, is now going to be involved. setting the flag on means no cluster
coherency considered, usually, userspace tools choose none-coherency strategy by
default for the sake of performace.

Signed-off-by: default avatarTristan Ye <tristan.ye@oracle.com>
parent 8aa1fa36

fs/ocfs2/ioctl.c

+128 −0
Original line number Diff line number Diff line
@@ -22,6 +22,9 @@ 
#include "ioctl.h"

#include "resize.h"

#include "refcounttree.h"

#include "sysfile.h"

#include "dir.h"

#include "buffer_head_io.h"



#include <linux/ext2_fs.h>
@@ -52,6 +55,11 @@ static inline void o2info_clear_request_filled(struct ocfs2_info_request *req) 
	req->ir_flags &= ~OCFS2_INFO_FL_FILLED;

}



static inline int o2info_coherent(struct ocfs2_info_request *req)

{

	return (!(req->ir_flags & OCFS2_INFO_FL_NON_COHERENT));

}



static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)

{

	int status;
@@ -309,6 +317,122 @@ bail: 
	return status;

}



int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb,

				struct inode *inode_alloc, u64 blkno,

				struct ocfs2_info_freeinode *fi, u32 slot)

{

	int status = 0, unlock = 0;



	struct buffer_head *bh = NULL;

	struct ocfs2_dinode *dinode_alloc = NULL;



	if (inode_alloc)

		mutex_lock(&inode_alloc->i_mutex);



	if (o2info_coherent(&fi->ifi_req)) {

		status = ocfs2_inode_lock(inode_alloc, &bh, 0);

		if (status < 0) {

			mlog_errno(status);

			goto bail;

		}

		unlock = 1;

	} else {

		status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);

		if (status < 0) {

			mlog_errno(status);

			goto bail;

		}

	}



	dinode_alloc = (struct ocfs2_dinode *)bh->b_data;



	fi->ifi_stat[slot].lfi_total =

		le32_to_cpu(dinode_alloc->id1.bitmap1.i_total);

	fi->ifi_stat[slot].lfi_free =

		le32_to_cpu(dinode_alloc->id1.bitmap1.i_total) -

		le32_to_cpu(dinode_alloc->id1.bitmap1.i_used);



bail:

	if (unlock)

		ocfs2_inode_unlock(inode_alloc, 0);



	if (inode_alloc)

		mutex_unlock(&inode_alloc->i_mutex);



	brelse(bh);



	return status;

}



int ocfs2_info_handle_freeinode(struct inode *inode,

				struct ocfs2_info_request __user *req)

{

	u32 i;

	u64 blkno = -1;

	char namebuf[40];

	int status = -EFAULT, type = INODE_ALLOC_SYSTEM_INODE;

	struct ocfs2_info_freeinode *oifi = NULL;

	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	struct inode *inode_alloc = NULL;



	oifi = kzalloc(sizeof(struct ocfs2_info_freeinode), GFP_KERNEL);

	if (!oifi) {

		status = -ENOMEM;

		mlog_errno(status);

		goto bail;

	}



	if (o2info_from_user(*oifi, req))

		goto bail;



	oifi->ifi_slotnum = osb->max_slots;



	for (i = 0; i < oifi->ifi_slotnum; i++) {

		if (o2info_coherent(&oifi->ifi_req)) {

			inode_alloc = ocfs2_get_system_file_inode(osb, type, i);

			if (!inode_alloc) {

				mlog(ML_ERROR, "unable to get alloc inode in "

				    "slot %u\n", i);

				status = -EIO;

				goto bail;

			}

		} else {

			ocfs2_sprintf_system_inode_name(namebuf,

							sizeof(namebuf),

							type, i);

			status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,

							    namebuf,

							    strlen(namebuf),

							    &blkno);

			if (status < 0) {

				status = -ENOENT;

				goto bail;

			}

		}



		status = ocfs2_info_scan_inode_alloc(osb, inode_alloc, blkno, oifi, i);

		if (status < 0)

			goto bail;



		iput(inode_alloc);

		inode_alloc = NULL;

	}



	o2info_set_request_filled(&oifi->ifi_req);



	if (o2info_to_user(*oifi, req))

		goto bail;



	status = 0;

bail:

	if (status)

		o2info_set_request_error(&oifi->ifi_req, req);



	kfree(oifi);



	return status;

}



int ocfs2_info_handle_unknown(struct inode *inode,

			      struct ocfs2_info_request __user *req)

{
@@ -380,6 +504,10 @@ int ocfs2_info_handle_request(struct inode *inode, 
		if (oir.ir_size == sizeof(struct ocfs2_info_journal_size))

			status = ocfs2_info_handle_journal_size(inode, req);

		break;

	case OCFS2_INFO_FREEINODE:

		if (oir.ir_size == sizeof(struct ocfs2_info_freeinode))

			status = ocfs2_info_handle_freeinode(inode, req);

		break;

	default:

		status = ocfs2_info_handle_unknown(inode, req);

		break;

fs/ocfs2/ocfs2_ioctl.h

+11 −0
Original line number Diff line number Diff line
@@ -142,6 +142,16 @@ struct ocfs2_info_journal_size { 
	__u64 ij_journal_size;

};



struct ocfs2_info_freeinode {

	struct ocfs2_info_request ifi_req;

	struct ocfs2_info_local_freeinode {

		__u64 lfi_total;

		__u64 lfi_free;

	} ifi_stat[OCFS2_MAX_SLOTS];

	__u32 ifi_slotnum; /* out */

	__u32 ifi_pad;

};



/* Codes for ocfs2_info_request */

enum ocfs2_info_type {

	OCFS2_INFO_CLUSTERSIZE = 1,
@@ -151,6 +161,7 @@ enum ocfs2_info_type { 
	OCFS2_INFO_UUID,

	OCFS2_INFO_FS_FEATURES,

	OCFS2_INFO_JOURNAL_SIZE,

	OCFS2_INFO_FREEINODE,

	OCFS2_INFO_NUM_TYPES

};

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