[mirror_ubuntu-zesty-kernel.git] / fs / ocfs2 / ioctl.c

/*
 * linux/fs/ocfs2/ioctl.c
 *
 * Copyright (C) 2006 Herbert Poetzl
 * adapted from Remy Card's ext2/ioctl.c
 */

#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/compat.h>

#include <cluster/masklog.h>

#include "ocfs2.h"
#include "alloc.h"
#include "dlmglue.h"
#include "file.h"
#include "inode.h"
#include "journal.h"

#include "ocfs2_fs.h"
#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>

#define o2info_from_user(a, b)	\
		copy_from_user(&(a), (b), sizeof(a))
#define o2info_to_user(a, b)	\
		copy_to_user((typeof(a) __user *)b, &(a), sizeof(a))

/*
 * This call is void because we are already reporting an error that may
 * be -EFAULT.  The error will be returned from the ioctl(2) call.  It's
 * just a best-effort to tell userspace that this request caused the error.
 */
static inline void o2info_set_request_error(struct ocfs2_info_request *kreq,
					struct ocfs2_info_request __user *req)
{
	kreq->ir_flags |= OCFS2_INFO_FL_ERROR;
	(void)put_user(kreq->ir_flags, (__u32 __user *)&(req->ir_flags));
}

static inline void o2info_set_request_filled(struct ocfs2_info_request *req)
{
	req->ir_flags |= OCFS2_INFO_FL_FILLED;
}

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;

	status = ocfs2_inode_lock(inode, NULL, 0);
	if (status < 0) {
		mlog_errno(status);
		return status;
	}
	ocfs2_get_inode_flags(OCFS2_I(inode));
	*flags = OCFS2_I(inode)->ip_attr;
	ocfs2_inode_unlock(inode, 0);

	return status;
}

static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
				unsigned mask)
{
	struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	handle_t *handle = NULL;
	struct buffer_head *bh = NULL;
	unsigned oldflags;
	int status;

	mutex_lock(&inode->i_mutex);

	status = ocfs2_inode_lock(inode, &bh, 1);
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}

	status = -EACCES;
	if (!inode_owner_or_capable(inode))
		goto bail_unlock;

	if (!S_ISDIR(inode->i_mode))
		flags &= ~OCFS2_DIRSYNC_FL;

	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
	if (IS_ERR(handle)) {
		status = PTR_ERR(handle);
		mlog_errno(status);
		goto bail_unlock;
	}

	oldflags = ocfs2_inode->ip_attr;
	flags = flags & mask;
	flags |= oldflags & ~mask;

	/*
	 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
	 * the relevant capability.
	 */
	status = -EPERM;
	if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) &
		(OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) {
		if (!capable(CAP_LINUX_IMMUTABLE))
			goto bail_unlock;
	}

	ocfs2_inode->ip_attr = flags;
	ocfs2_set_inode_flags(inode);

	status = ocfs2_mark_inode_dirty(handle, inode, bh);
	if (status < 0)
		mlog_errno(status);

	ocfs2_commit_trans(osb, handle);
bail_unlock:
	ocfs2_inode_unlock(inode, 1);
bail:
	mutex_unlock(&inode->i_mutex);

	brelse(bh);

	return status;
}

int ocfs2_info_handle_blocksize(struct inode *inode,
				struct ocfs2_info_request __user *req)
{
	int status = -EFAULT;
	struct ocfs2_info_blocksize oib;

	if (o2info_from_user(oib, req))
		goto bail;

	oib.ib_blocksize = inode->i_sb->s_blocksize;

	o2info_set_request_filled(&oib.ib_req);

	if (o2info_to_user(oib, req))
		goto bail;

	status = 0;
bail:
	if (status)
		o2info_set_request_error(&oib.ib_req, req);

	return status;
}

int ocfs2_info_handle_clustersize(struct inode *inode,
				  struct ocfs2_info_request __user *req)
{
	int status = -EFAULT;
	struct ocfs2_info_clustersize oic;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	if (o2info_from_user(oic, req))
		goto bail;

	oic.ic_clustersize = osb->s_clustersize;

	o2info_set_request_filled(&oic.ic_req);

	if (o2info_to_user(oic, req))
		goto bail;

	status = 0;
bail:
	if (status)
		o2info_set_request_error(&oic.ic_req, req);

	return status;
}

int ocfs2_info_handle_maxslots(struct inode *inode,
			       struct ocfs2_info_request __user *req)
{
	int status = -EFAULT;
	struct ocfs2_info_maxslots oim;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	if (o2info_from_user(oim, req))
		goto bail;

	oim.im_max_slots = osb->max_slots;

	o2info_set_request_filled(&oim.im_req);

	if (o2info_to_user(oim, req))
		goto bail;

	status = 0;
bail:
	if (status)
		o2info_set_request_error(&oim.im_req, req);

	return status;
}

int ocfs2_info_handle_label(struct inode *inode,
			    struct ocfs2_info_request __user *req)
{
	int status = -EFAULT;
	struct ocfs2_info_label oil;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	if (o2info_from_user(oil, req))
		goto bail;

	memcpy(oil.il_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN);

	o2info_set_request_filled(&oil.il_req);

	if (o2info_to_user(oil, req))
		goto bail;

	status = 0;
bail:
	if (status)
		o2info_set_request_error(&oil.il_req, req);

	return status;
}

int ocfs2_info_handle_uuid(struct inode *inode,
			   struct ocfs2_info_request __user *req)
{
	int status = -EFAULT;
	struct ocfs2_info_uuid oiu;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	if (o2info_from_user(oiu, req))
		goto bail;

	memcpy(oiu.iu_uuid_str, osb->uuid_str, OCFS2_TEXT_UUID_LEN + 1);

	o2info_set_request_filled(&oiu.iu_req);

	if (o2info_to_user(oiu, req))
		goto bail;

	status = 0;
bail:
	if (status)
		o2info_set_request_error(&oiu.iu_req, req);

	return status;
}

int ocfs2_info_handle_fs_features(struct inode *inode,
				  struct ocfs2_info_request __user *req)
{
	int status = -EFAULT;
	struct ocfs2_info_fs_features oif;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	if (o2info_from_user(oif, req))
		goto bail;

	oif.if_compat_features = osb->s_feature_compat;
	oif.if_incompat_features = osb->s_feature_incompat;
	oif.if_ro_compat_features = osb->s_feature_ro_compat;

	o2info_set_request_filled(&oif.if_req);

	if (o2info_to_user(oif, req))
		goto bail;

	status = 0;
bail:
	if (status)
		o2info_set_request_error(&oif.if_req, req);

	return status;
}

int ocfs2_info_handle_journal_size(struct inode *inode,
				   struct ocfs2_info_request __user *req)
{
	int status = -EFAULT;
	struct ocfs2_info_journal_size oij;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	if (o2info_from_user(oij, req))
		goto bail;

	oij.ij_journal_size = osb->journal->j_inode->i_size;

	o2info_set_request_filled(&oij.ij_req);

	if (o2info_to_user(oij, req))
		goto bail;

	status = 0;
bail:
	if (status)
		o2info_set_request_error(&oij.ij_req, req);

	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)
{
	int status = -EFAULT;
	struct ocfs2_info_request oir;

	if (o2info_from_user(oir, req))
		goto bail;

	o2info_clear_request_filled(&oir);

	if (o2info_to_user(oir, req))
		goto bail;

	status = 0;
bail:
	if (status)
		o2info_set_request_error(&oir, req);

	return status;
}

/*
 * Validate and distinguish OCFS2_IOC_INFO requests.
 *
 * - validate the magic number.
 * - distinguish different requests.
 * - validate size of different requests.
 */
int ocfs2_info_handle_request(struct inode *inode,
			      struct ocfs2_info_request __user *req)
{
	int status = -EFAULT;
	struct ocfs2_info_request oir;

	if (o2info_from_user(oir, req))
		goto bail;

	status = -EINVAL;
	if (oir.ir_magic != OCFS2_INFO_MAGIC)
		goto bail;

	switch (oir.ir_code) {
	case OCFS2_INFO_BLOCKSIZE:
		if (oir.ir_size == sizeof(struct ocfs2_info_blocksize))
			status = ocfs2_info_handle_blocksize(inode, req);
		break;
	case OCFS2_INFO_CLUSTERSIZE:
		if (oir.ir_size == sizeof(struct ocfs2_info_clustersize))
			status = ocfs2_info_handle_clustersize(inode, req);
		break;
	case OCFS2_INFO_MAXSLOTS:
		if (oir.ir_size == sizeof(struct ocfs2_info_maxslots))
			status = ocfs2_info_handle_maxslots(inode, req);
		break;
	case OCFS2_INFO_LABEL:
		if (oir.ir_size == sizeof(struct ocfs2_info_label))
			status = ocfs2_info_handle_label(inode, req);
		break;
	case OCFS2_INFO_UUID:
		if (oir.ir_size == sizeof(struct ocfs2_info_uuid))
			status = ocfs2_info_handle_uuid(inode, req);
		break;
	case OCFS2_INFO_FS_FEATURES:
		if (oir.ir_size == sizeof(struct ocfs2_info_fs_features))
			status = ocfs2_info_handle_fs_features(inode, req);
		break;
	case OCFS2_INFO_JOURNAL_SIZE:
		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;
	}

bail:
	return status;
}

int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx,
			  u64 *req_addr, int compat_flag)
{
	int status = -EFAULT;
	u64 __user *bp = NULL;

	if (compat_flag) {
#ifdef CONFIG_COMPAT
		/*
		 * pointer bp stores the base address of a pointers array,
		 * which collects all addresses of separate request.
		 */
		bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests);
#else
		BUG();
#endif
	} else
		bp = (u64 __user *)(unsigned long)(info->oi_requests);

	if (o2info_from_user(*req_addr, bp + idx))
		goto bail;

	status = 0;
bail:
	return status;
}

/*
 * OCFS2_IOC_INFO handles an array of requests passed from userspace.
 *
 * ocfs2_info_handle() recevies a large info aggregation, grab and
 * validate the request count from header, then break it into small
 * pieces, later specific handlers can handle them one by one.
 *
 * Idea here is to make each separate request small enough to ensure
 * a better backward&forward compatibility, since a small piece of
 * request will be less likely to be broken if disk layout get changed.
 */
int ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info,
		      int compat_flag)
{
	int i, status = 0;
	u64 req_addr;
	struct ocfs2_info_request __user *reqp;

	if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) ||
	    (!info->oi_requests)) {
		status = -EINVAL;
		goto bail;
	}

	for (i = 0; i < info->oi_count; i++) {

		status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag);
		if (status)
			break;

		reqp = (struct ocfs2_info_request *)(unsigned long)req_addr;
		if (!reqp) {
			status = -EINVAL;
			goto bail;
		}

		status = ocfs2_info_handle_request(inode, reqp);
		if (status)
			break;
	}

bail:
	return status;
}

long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	struct inode *inode = filp->f_path.dentry->d_inode;
	unsigned int flags;
	int new_clusters;
	int status;
	struct ocfs2_space_resv sr;
	struct ocfs2_new_group_input input;
	struct reflink_arguments args;
	const char *old_path, *new_path;
	bool preserve;
	struct ocfs2_info info;

	switch (cmd) {
	case OCFS2_IOC_GETFLAGS:
		status = ocfs2_get_inode_attr(inode, &flags);
		if (status < 0)
			return status;

		flags &= OCFS2_FL_VISIBLE;
		return put_user(flags, (int __user *) arg);
	case OCFS2_IOC_SETFLAGS:
		if (get_user(flags, (int __user *) arg))
			return -EFAULT;

		status = mnt_want_write(filp->f_path.mnt);
		if (status)
			return status;
		status = ocfs2_set_inode_attr(inode, flags,
			OCFS2_FL_MODIFIABLE);
		mnt_drop_write(filp->f_path.mnt);
		return status;
	case OCFS2_IOC_RESVSP:
	case OCFS2_IOC_RESVSP64:
	case OCFS2_IOC_UNRESVSP:
	case OCFS2_IOC_UNRESVSP64:
		if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
			return -EFAULT;

		return ocfs2_change_file_space(filp, cmd, &sr);
	case OCFS2_IOC_GROUP_EXTEND:
		if (!capable(CAP_SYS_RESOURCE))
			return -EPERM;

		if (get_user(new_clusters, (int __user *)arg))
			return -EFAULT;

		return ocfs2_group_extend(inode, new_clusters);
	case OCFS2_IOC_GROUP_ADD:
	case OCFS2_IOC_GROUP_ADD64:
		if (!capable(CAP_SYS_RESOURCE))
			return -EPERM;

		if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
			return -EFAULT;

		return ocfs2_group_add(inode, &input);
	case OCFS2_IOC_REFLINK:
		if (copy_from_user(&args, (struct reflink_arguments *)arg,
				   sizeof(args)))
			return -EFAULT;
		old_path = (const char *)(unsigned long)args.old_path;
		new_path = (const char *)(unsigned long)args.new_path;
		preserve = (args.preserve != 0);

		return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
	case OCFS2_IOC_INFO:
		if (copy_from_user(&info, (struct ocfs2_info __user *)arg,
				   sizeof(struct ocfs2_info)))
			return -EFAULT;

		return ocfs2_info_handle(inode, &info, 0);
	default:
		return -ENOTTY;
	}
}

#ifdef CONFIG_COMPAT
long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
{
	bool preserve;
	struct reflink_arguments args;
	struct inode *inode = file->f_path.dentry->d_inode;
	struct ocfs2_info info;

	switch (cmd) {
	case OCFS2_IOC32_GETFLAGS:
		cmd = OCFS2_IOC_GETFLAGS;
		break;
	case OCFS2_IOC32_SETFLAGS:
		cmd = OCFS2_IOC_SETFLAGS;
		break;
	case OCFS2_IOC_RESVSP:
	case OCFS2_IOC_RESVSP64:
	case OCFS2_IOC_UNRESVSP:
	case OCFS2_IOC_UNRESVSP64:
	case OCFS2_IOC_GROUP_EXTEND:
	case OCFS2_IOC_GROUP_ADD:
	case OCFS2_IOC_GROUP_ADD64:
		break;
	case OCFS2_IOC_REFLINK:
		if (copy_from_user(&args, (struct reflink_arguments *)arg,
				   sizeof(args)))
			return -EFAULT;
		preserve = (args.preserve != 0);

		return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
					   compat_ptr(args.new_path), preserve);
	case OCFS2_IOC_INFO:
		if (copy_from_user(&info, (struct ocfs2_info __user *)arg,
				   sizeof(struct ocfs2_info)))
			return -EFAULT;

		return ocfs2_info_handle(inode, &info, 1);
	default:
		return -ENOIOCTLCMD;
	}

	return ocfs2_ioctl(file, cmd, arg);
}
#endif
Commit	Line	Data
ca4d147e HP	1	/*
	2	* linux/fs/ocfs2/ioctl.c
	3	*
	4	* Copyright (C) 2006 Herbert Poetzl
	5	* adapted from Remy Card's ext2/ioctl.c
	6	*/
	7
	8	#include <linux/fs.h>
	9	#include <linux/mount.h>
34e6c59a	10	#include <linux/compat.h>
ca4d147e	11
ca4d147e HP	12	#include <cluster/masklog.h>
	13
	14	#include "ocfs2.h"
	15	#include "alloc.h"
	16	#include "dlmglue.h"
b2580103	17	#include "file.h"
ca4d147e HP	18	#include "inode.h"
	19	#include "journal.h"
	20
	21	#include "ocfs2_fs.h"
2d562518	22	#include "ioctl.h"
d659072f	23	#include "resize.h"
bd50873d	24	#include "refcounttree.h"
3e5db17d TY	25	#include "sysfile.h"
	26	#include "dir.h"
	27	#include "buffer_head_io.h"
2d562518	28
ca4d147e HP	29	#include <linux/ext2_fs.h>
ca4d147e HP	30
ddee5cdb TY	31	#define o2info_from_user(a, b) \
	32	copy_from_user(&(a), (b), sizeof(a))
	33	#define o2info_to_user(a, b) \
	34	copy_to_user((typeof(a) __user *)b, &(a), sizeof(a))
	35
	36	/*
	37	* This call is void because we are already reporting an error that may
	38	* be -EFAULT. The error will be returned from the ioctl(2) call. It's
	39	* just a best-effort to tell userspace that this request caused the error.
	40	*/
8aa1fa36	41	static inline void o2info_set_request_error(struct ocfs2_info_request *kreq,
ddee5cdb TY	42	struct ocfs2_info_request __user *req)
	43	{
	44	kreq->ir_flags \|= OCFS2_INFO_FL_ERROR;
	45	(void)put_user(kreq->ir_flags, (__u32 __user *)&(req->ir_flags));
	46	}
	47
8aa1fa36	48	static inline void o2info_set_request_filled(struct ocfs2_info_request *req)
1936a267 TY	49	{
	50	req->ir_flags \|= OCFS2_INFO_FL_FILLED;
	51	}
	52
8aa1fa36	53	static inline void o2info_clear_request_filled(struct ocfs2_info_request *req)
1936a267 TY	54	{
	55	req->ir_flags &= ~OCFS2_INFO_FL_FILLED;
	56	}
	57
3e5db17d TY	58	static inline int o2info_coherent(struct ocfs2_info_request *req)
	59	{
	60	return (!(req->ir_flags & OCFS2_INFO_FL_NON_COHERENT));
	61	}
	62
ca4d147e HP	63	static int ocfs2_get_inode_attr(struct inode inode, unsigned flags)
	64	{
	65	int status;
	66
e63aecb6	67	status = ocfs2_inode_lock(inode, NULL, 0);
ca4d147e HP	68	if (status < 0) {
	69	mlog_errno(status);
	70	return status;
	71	}
6e4b0d56	72	ocfs2_get_inode_flags(OCFS2_I(inode));
ca4d147e	73	*flags = OCFS2_I(inode)->ip_attr;
e63aecb6	74	ocfs2_inode_unlock(inode, 0);
ca4d147e	75
ca4d147e HP	76	return status;
	77	}
	78
	79	static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
	80	unsigned mask)
	81	{
	82	struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
	83	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1fabe148	84	handle_t *handle = NULL;
ca4d147e HP	85	struct buffer_head *bh = NULL;
	86	unsigned oldflags;
	87	int status;
	88
	89	mutex_lock(&inode->i_mutex);
	90
e63aecb6	91	status = ocfs2_inode_lock(inode, &bh, 1);
ca4d147e HP	92	if (status < 0) {
	93	mlog_errno(status);
	94	goto bail;
	95	}
	96
ca4d147e	97	status = -EACCES;
2e149670	98	if (!inode_owner_or_capable(inode))
ca4d147e HP	99	goto bail_unlock;
	100
	101	if (!S_ISDIR(inode->i_mode))
	102	flags &= ~OCFS2_DIRSYNC_FL;
	103
65eff9cc	104	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
ca4d147e HP	105	if (IS_ERR(handle)) {
	106	status = PTR_ERR(handle);
	107	mlog_errno(status);
	108	goto bail_unlock;
	109	}
	110
	111	oldflags = ocfs2_inode->ip_attr;
	112	flags = flags & mask;
	113	flags \|= oldflags & ~mask;
	114
	115	/*
	116	* The IMMUTABLE and APPEND_ONLY flags can only be changed by
	117	* the relevant capability.
	118	*/
	119	status = -EPERM;
	120	if ((oldflags & OCFS2_IMMUTABLE_FL) \|\| ((flags ^ oldflags) &
	121	(OCFS2_APPEND_FL \| OCFS2_IMMUTABLE_FL))) {
	122	if (!capable(CAP_LINUX_IMMUTABLE))
	123	goto bail_unlock;
	124	}
	125
	126	ocfs2_inode->ip_attr = flags;
	127	ocfs2_set_inode_flags(inode);
	128
	129	status = ocfs2_mark_inode_dirty(handle, inode, bh);
	130	if (status < 0)
	131	mlog_errno(status);
	132
02dc1af4	133	ocfs2_commit_trans(osb, handle);
ca4d147e	134	bail_unlock:
e63aecb6	135	ocfs2_inode_unlock(inode, 1);
ca4d147e HP	136	bail:
	137	mutex_unlock(&inode->i_mutex);
	138
a81cb88b	139	brelse(bh);
ca4d147e	140
ca4d147e HP	141	return status;
	142	}
	143
ddee5cdb TY	144	int ocfs2_info_handle_blocksize(struct inode *inode,
	145	struct ocfs2_info_request __user *req)
	146	{
	147	int status = -EFAULT;
	148	struct ocfs2_info_blocksize oib;
	149
	150	if (o2info_from_user(oib, req))
	151	goto bail;
	152
	153	oib.ib_blocksize = inode->i_sb->s_blocksize;
1936a267	154
8aa1fa36	155	o2info_set_request_filled(&oib.ib_req);
ddee5cdb TY	156
	157	if (o2info_to_user(oib, req))
	158	goto bail;
	159
	160	status = 0;
	161	bail:
	162	if (status)
8aa1fa36	163	o2info_set_request_error(&oib.ib_req, req);
ddee5cdb TY	164
	165	return status;
	166	}
	167
	168	int ocfs2_info_handle_clustersize(struct inode *inode,
	169	struct ocfs2_info_request __user *req)
	170	{
	171	int status = -EFAULT;
	172	struct ocfs2_info_clustersize oic;
	173	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	174
	175	if (o2info_from_user(oic, req))
	176	goto bail;
	177
	178	oic.ic_clustersize = osb->s_clustersize;
1936a267	179
8aa1fa36	180	o2info_set_request_filled(&oic.ic_req);
ddee5cdb TY	181
	182	if (o2info_to_user(oic, req))
	183	goto bail;
	184
	185	status = 0;
	186	bail:
	187	if (status)
8aa1fa36	188	o2info_set_request_error(&oic.ic_req, req);
ddee5cdb TY	189
	190	return status;
	191	}
	192
	193	int ocfs2_info_handle_maxslots(struct inode *inode,
	194	struct ocfs2_info_request __user *req)
	195	{
	196	int status = -EFAULT;
	197	struct ocfs2_info_maxslots oim;
	198	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	199
	200	if (o2info_from_user(oim, req))
	201	goto bail;
	202
	203	oim.im_max_slots = osb->max_slots;
1936a267	204
8aa1fa36	205	o2info_set_request_filled(&oim.im_req);
ddee5cdb TY	206
	207	if (o2info_to_user(oim, req))
	208	goto bail;
	209
	210	status = 0;
	211	bail:
	212	if (status)
8aa1fa36	213	o2info_set_request_error(&oim.im_req, req);
ddee5cdb TY	214
	215	return status;
	216	}
	217
	218	int ocfs2_info_handle_label(struct inode *inode,
	219	struct ocfs2_info_request __user *req)
	220	{
	221	int status = -EFAULT;
	222	struct ocfs2_info_label oil;
	223	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	224
	225	if (o2info_from_user(oil, req))
	226	goto bail;
	227
	228	memcpy(oil.il_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN);
1936a267	229
8aa1fa36	230	o2info_set_request_filled(&oil.il_req);
ddee5cdb TY	231
	232	if (o2info_to_user(oil, req))
	233	goto bail;
	234
	235	status = 0;
	236	bail:
	237	if (status)
8aa1fa36	238	o2info_set_request_error(&oil.il_req, req);
ddee5cdb TY	239
	240	return status;
	241	}
	242
	243	int ocfs2_info_handle_uuid(struct inode *inode,
	244	struct ocfs2_info_request __user *req)
	245	{
	246	int status = -EFAULT;
	247	struct ocfs2_info_uuid oiu;
	248	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	249
	250	if (o2info_from_user(oiu, req))
	251	goto bail;
	252
	253	memcpy(oiu.iu_uuid_str, osb->uuid_str, OCFS2_TEXT_UUID_LEN + 1);
1936a267	254
8aa1fa36	255	o2info_set_request_filled(&oiu.iu_req);
ddee5cdb TY	256
	257	if (o2info_to_user(oiu, req))
	258	goto bail;
	259
	260	status = 0;
	261	bail:
	262	if (status)
8aa1fa36	263	o2info_set_request_error(&oiu.iu_req, req);
ddee5cdb TY	264
	265	return status;
	266	}
	267
	268	int ocfs2_info_handle_fs_features(struct inode *inode,
	269	struct ocfs2_info_request __user *req)
	270	{
	271	int status = -EFAULT;
	272	struct ocfs2_info_fs_features oif;
	273	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	274
	275	if (o2info_from_user(oif, req))
	276	goto bail;
	277
	278	oif.if_compat_features = osb->s_feature_compat;
	279	oif.if_incompat_features = osb->s_feature_incompat;
	280	oif.if_ro_compat_features = osb->s_feature_ro_compat;
1936a267	281
8aa1fa36	282	o2info_set_request_filled(&oif.if_req);
ddee5cdb TY	283
	284	if (o2info_to_user(oif, req))
	285	goto bail;
	286
	287	status = 0;
	288	bail:
	289	if (status)
8aa1fa36	290	o2info_set_request_error(&oif.if_req, req);
ddee5cdb TY	291
	292	return status;
	293	}
	294
	295	int ocfs2_info_handle_journal_size(struct inode *inode,
	296	struct ocfs2_info_request __user *req)
	297	{
	298	int status = -EFAULT;
	299	struct ocfs2_info_journal_size oij;
	300	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	301
	302	if (o2info_from_user(oij, req))
	303	goto bail;
	304
	305	oij.ij_journal_size = osb->journal->j_inode->i_size;
	306
8aa1fa36	307	o2info_set_request_filled(&oij.ij_req);
ddee5cdb TY	308
	309	if (o2info_to_user(oij, req))
	310	goto bail;
	311
	312	status = 0;
	313	bail:
	314	if (status)
8aa1fa36	315	o2info_set_request_error(&oij.ij_req, req);
ddee5cdb TY	316
	317	return status;
	318	}
	319
3e5db17d TY	320	int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb,
	321	struct inode *inode_alloc, u64 blkno,
	322	struct ocfs2_info_freeinode *fi, u32 slot)
	323	{
	324	int status = 0, unlock = 0;
	325
	326	struct buffer_head *bh = NULL;
	327	struct ocfs2_dinode *dinode_alloc = NULL;
	328
	329	if (inode_alloc)
	330	mutex_lock(&inode_alloc->i_mutex);
	331
	332	if (o2info_coherent(&fi->ifi_req)) {
	333	status = ocfs2_inode_lock(inode_alloc, &bh, 0);
	334	if (status < 0) {
	335	mlog_errno(status);
	336	goto bail;
	337	}
	338	unlock = 1;
	339	} else {
	340	status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
	341	if (status < 0) {
	342	mlog_errno(status);
	343	goto bail;
	344	}
	345	}
	346
	347	dinode_alloc = (struct ocfs2_dinode *)bh->b_data;
	348
	349	fi->ifi_stat[slot].lfi_total =
	350	le32_to_cpu(dinode_alloc->id1.bitmap1.i_total);
	351	fi->ifi_stat[slot].lfi_free =
	352	le32_to_cpu(dinode_alloc->id1.bitmap1.i_total) -
	353	le32_to_cpu(dinode_alloc->id1.bitmap1.i_used);
	354
	355	bail:
	356	if (unlock)
	357	ocfs2_inode_unlock(inode_alloc, 0);
	358
	359	if (inode_alloc)
	360	mutex_unlock(&inode_alloc->i_mutex);
	361
	362	brelse(bh);
	363
	364	return status;
	365	}
	366
	367	int ocfs2_info_handle_freeinode(struct inode *inode,
	368	struct ocfs2_info_request __user *req)
	369	{
	370	u32 i;
	371	u64 blkno = -1;
	372	char namebuf[40];
	373	int status = -EFAULT, type = INODE_ALLOC_SYSTEM_INODE;
	374	struct ocfs2_info_freeinode *oifi = NULL;
	375	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	376	struct inode *inode_alloc = NULL;
	377
	378	oifi = kzalloc(sizeof(struct ocfs2_info_freeinode), GFP_KERNEL);
	379	if (!oifi) {
	380	status = -ENOMEM;
	381	mlog_errno(status);
	382	goto bail;
	383	}
384
385	if (o2info_from_user(*oifi, req))
386	goto bail;
387
388	oifi->ifi_slotnum = osb->max_slots;
389
390	for (i = 0; i < oifi->ifi_slotnum; i++) {
391	if (o2info_coherent(&oifi->ifi_req)) {
392	inode_alloc = ocfs2_get_system_file_inode(osb, type, i);
393	if (!inode_alloc) {
394	mlog(ML_ERROR, "unable to get alloc inode in "
395	"slot %u\n", i);
396	status = -EIO;
397	goto bail;
398	}
399	} else {
400	ocfs2_sprintf_system_inode_name(namebuf,
401	sizeof(namebuf),
402	type, i);
403	status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
404	namebuf,
405	strlen(namebuf),
406	&blkno);
407	if (status < 0) {
408	status = -ENOENT;
409	goto bail;
410	}
411	}
412
413	status = ocfs2_info_scan_inode_alloc(osb, inode_alloc, blkno, oifi, i);
414	if (status < 0)
415	goto bail;
416
417	iput(inode_alloc);
418	inode_alloc = NULL;
419	}
420
421	o2info_set_request_filled(&oifi->ifi_req);
422
423	if (o2info_to_user(*oifi, req))
424	goto bail;
425
426	status = 0;
427	bail:
428	if (status)
429	o2info_set_request_error(&oifi->ifi_req, req);
430
431	kfree(oifi);
432
433	return status;
434	}
435
ddee5cdb TY	436	int ocfs2_info_handle_unknown(struct inode *inode,
	437	struct ocfs2_info_request __user *req)
	438	{
	439	int status = -EFAULT;
	440	struct ocfs2_info_request oir;
	441
	442	if (o2info_from_user(oir, req))
	443	goto bail;
	444
8aa1fa36	445	o2info_clear_request_filled(&oir);
ddee5cdb TY	446
	447	if (o2info_to_user(oir, req))
	448	goto bail;
	449
	450	status = 0;
	451	bail:
	452	if (status)
8aa1fa36	453	o2info_set_request_error(&oir, req);
ddee5cdb TY	454
	455	return status;
	456	}
	457
	458	/*
	459	* Validate and distinguish OCFS2_IOC_INFO requests.
	460	*
	461	* - validate the magic number.
	462	* - distinguish different requests.
	463	* - validate size of different requests.
	464	*/
	465	int ocfs2_info_handle_request(struct inode *inode,
	466	struct ocfs2_info_request __user *req)
	467	{
	468	int status = -EFAULT;
	469	struct ocfs2_info_request oir;
	470
	471	if (o2info_from_user(oir, req))
	472	goto bail;
	473
	474	status = -EINVAL;
	475	if (oir.ir_magic != OCFS2_INFO_MAGIC)
	476	goto bail;
	477
	478	switch (oir.ir_code) {
	479	case OCFS2_INFO_BLOCKSIZE:
	480	if (oir.ir_size == sizeof(struct ocfs2_info_blocksize))
	481	status = ocfs2_info_handle_blocksize(inode, req);
	482	break;
	483	case OCFS2_INFO_CLUSTERSIZE:
	484	if (oir.ir_size == sizeof(struct ocfs2_info_clustersize))
	485	status = ocfs2_info_handle_clustersize(inode, req);
	486	break;
	487	case OCFS2_INFO_MAXSLOTS:
	488	if (oir.ir_size == sizeof(struct ocfs2_info_maxslots))
	489	status = ocfs2_info_handle_maxslots(inode, req);
	490	break;
	491	case OCFS2_INFO_LABEL:
	492	if (oir.ir_size == sizeof(struct ocfs2_info_label))
	493	status = ocfs2_info_handle_label(inode, req);
	494	break;
	495	case OCFS2_INFO_UUID:
	496	if (oir.ir_size == sizeof(struct ocfs2_info_uuid))
	497	status = ocfs2_info_handle_uuid(inode, req);
	498	break;
	499	case OCFS2_INFO_FS_FEATURES:
	500	if (oir.ir_size == sizeof(struct ocfs2_info_fs_features))
	501	status = ocfs2_info_handle_fs_features(inode, req);
	502	break;
	503	case OCFS2_INFO_JOURNAL_SIZE:
	504	if (oir.ir_size == sizeof(struct ocfs2_info_journal_size))
	505	status = ocfs2_info_handle_journal_size(inode, req);
	506	break;
3e5db17d TY	507	case OCFS2_INFO_FREEINODE:
	508	if (oir.ir_size == sizeof(struct ocfs2_info_freeinode))
	509	status = ocfs2_info_handle_freeinode(inode, req);
	510	break;
ddee5cdb TY	511	default:
	512	status = ocfs2_info_handle_unknown(inode, req);
	513	break;
	514	}
	515
	516	bail:
	517	return status;
	518	}
	519
	520	int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx,
	521	u64 *req_addr, int compat_flag)
	522	{
	523	int status = -EFAULT;
	524	u64 __user *bp = NULL;
	525
	526	if (compat_flag) {
	527	#ifdef CONFIG_COMPAT
	528	/*
	529	* pointer bp stores the base address of a pointers array,
	530	* which collects all addresses of separate request.
	531	*/
	532	bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests);
	533	#else
	534	BUG();
	535	#endif
	536	} else
	537	bp = (u64 __user *)(unsigned long)(info->oi_requests);
	538
	539	if (o2info_from_user(*req_addr, bp + idx))
	540	goto bail;
	541
	542	status = 0;
	543	bail:
	544	return status;
	545	}
	546
	547	/*
	548	* OCFS2_IOC_INFO handles an array of requests passed from userspace.
	549	*
	550	* ocfs2_info_handle() recevies a large info aggregation, grab and
	551	* validate the request count from header, then break it into small
	552	* pieces, later specific handlers can handle them one by one.
	553	*
	554	* Idea here is to make each separate request small enough to ensure
	555	* a better backward&forward compatibility, since a small piece of
	556	* request will be less likely to be broken if disk layout get changed.
	557	*/
	558	int ocfs2_info_handle(struct inode inode, struct ocfs2_info info,
	559	int compat_flag)
	560	{
	561	int i, status = 0;
	562	u64 req_addr;
	563	struct ocfs2_info_request __user *reqp;
	564
	565	if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) \|\|
	566	(!info->oi_requests)) {
	567	status = -EINVAL;
	568	goto bail;
	569	}
	570
	571	for (i = 0; i < info->oi_count; i++) {
	572
	573	status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag);
	574	if (status)
575	break;
576
577	reqp = (struct ocfs2_info_request *)(unsigned long)req_addr;
578	if (!reqp) {
579	status = -EINVAL;
580	goto bail;
581	}
582
583	status = ocfs2_info_handle_request(inode, reqp);
584	if (status)
585	break;
586	}
587
588	bail:
589	return status;
590	}
591
c9ec1488	592	long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
ca4d147e	593	{
c9ec1488	594	struct inode *inode = filp->f_path.dentry->d_inode;
ca4d147e	595	unsigned int flags;
d659072f	596	int new_clusters;
ca4d147e	597	int status;
b2580103	598	struct ocfs2_space_resv sr;
7909f2bf	599	struct ocfs2_new_group_input input;
bd50873d TM	600	struct reflink_arguments args;
	601	const char old_path, new_path;
	602	bool preserve;
ddee5cdb	603	struct ocfs2_info info;
ca4d147e HP	604
	605	switch (cmd) {
	606	case OCFS2_IOC_GETFLAGS:
	607	status = ocfs2_get_inode_attr(inode, &flags);
	608	if (status < 0)
	609	return status;
	610
	611	flags &= OCFS2_FL_VISIBLE;
	612	return put_user(flags, (int __user *) arg);
	613	case OCFS2_IOC_SETFLAGS:
	614	if (get_user(flags, (int __user *) arg))
	615	return -EFAULT;
	616
42a74f20 DH	617	status = mnt_want_write(filp->f_path.mnt);
	618	if (status)
	619	return status;
	620	status = ocfs2_set_inode_attr(inode, flags,
ca4d147e	621	OCFS2_FL_MODIFIABLE);
42a74f20 DH	622	mnt_drop_write(filp->f_path.mnt);
42a74f20 DH	623	return status;
b2580103 MF	624	case OCFS2_IOC_RESVSP:
	625	case OCFS2_IOC_RESVSP64:
	626	case OCFS2_IOC_UNRESVSP:
	627	case OCFS2_IOC_UNRESVSP64:
	628	if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
	629	return -EFAULT;
	630
	631	return ocfs2_change_file_space(filp, cmd, &sr);
d659072f	632	case OCFS2_IOC_GROUP_EXTEND:
0957f007 MF	633	if (!capable(CAP_SYS_RESOURCE))
	634	return -EPERM;
	635
d659072f TM	636	if (get_user(new_clusters, (int __user *)arg))
	637	return -EFAULT;
	638
	639	return ocfs2_group_extend(inode, new_clusters);
7909f2bf TM	640	case OCFS2_IOC_GROUP_ADD:
7909f2bf TM	641	case OCFS2_IOC_GROUP_ADD64:
0957f007 MF	642	if (!capable(CAP_SYS_RESOURCE))
	643	return -EPERM;
	644
7909f2bf TM	645	if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
	646	return -EFAULT;
	647
	648	return ocfs2_group_add(inode, &input);
bd50873d TM	649	case OCFS2_IOC_REFLINK:
	650	if (copy_from_user(&args, (struct reflink_arguments *)arg,
	651	sizeof(args)))
	652	return -EFAULT;
	653	old_path = (const char *)(unsigned long)args.old_path;
	654	new_path = (const char *)(unsigned long)args.new_path;
	655	preserve = (args.preserve != 0);
	656
	657	return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
ddee5cdb TY	658	case OCFS2_IOC_INFO:
	659	if (copy_from_user(&info, (struct ocfs2_info __user *)arg,
	660	sizeof(struct ocfs2_info)))
	661	return -EFAULT;
	662
	663	return ocfs2_info_handle(inode, &info, 0);
ca4d147e HP	664	default:
	665	return -ENOTTY;
	666	}
	667	}
	668
586d232b MF	669	#ifdef CONFIG_COMPAT
	670	long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
	671	{
34e6c59a TM	672	bool preserve;
	673	struct reflink_arguments args;
	674	struct inode *inode = file->f_path.dentry->d_inode;
ddee5cdb	675	struct ocfs2_info info;
34e6c59a	676
586d232b MF	677	switch (cmd) {
	678	case OCFS2_IOC32_GETFLAGS:
	679	cmd = OCFS2_IOC_GETFLAGS;
	680	break;
	681	case OCFS2_IOC32_SETFLAGS:
	682	cmd = OCFS2_IOC_SETFLAGS;
	683	break;
b2580103 MF	684	case OCFS2_IOC_RESVSP:
	685	case OCFS2_IOC_RESVSP64:
	686	case OCFS2_IOC_UNRESVSP:
	687	case OCFS2_IOC_UNRESVSP64:
d659072f	688	case OCFS2_IOC_GROUP_EXTEND:
7909f2bf TM	689	case OCFS2_IOC_GROUP_ADD:
7909f2bf TM	690	case OCFS2_IOC_GROUP_ADD64:
b2580103	691	break;
34e6c59a TM	692	case OCFS2_IOC_REFLINK:
	693	if (copy_from_user(&args, (struct reflink_arguments *)arg,
	694	sizeof(args)))
	695	return -EFAULT;
	696	preserve = (args.preserve != 0);
	697
	698	return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
	699	compat_ptr(args.new_path), preserve);
ddee5cdb TY	700	case OCFS2_IOC_INFO:
	701	if (copy_from_user(&info, (struct ocfs2_info __user *)arg,
	702	sizeof(struct ocfs2_info)))
	703	return -EFAULT;
	704
	705	return ocfs2_info_handle(inode, &info, 1);
586d232b MF	706	default:
	707	return -ENOIOCTLCMD;
	708	}
	709
c9ec1488	710	return ocfs2_ioctl(file, cmd, arg);
586d232b MF	711	}
586d232b MF	712	#endif