Commit b2580103 authored by Mark Fasheh's avatar Mark Fasheh
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ocfs2: Support xfs style space reservation ioctls 



We re-use the RESVSP/UNRESVSP ioctls from xfs which allow the user to
allocate and deallocate regions to a file without zeroing data or changing
i_size.

Though renamed, the structure passed in from user is identical to struct
xfs_flock64. The three fields that are actually used right now are l_whence,
l_start and l_len.

This should get ocfs2 immediate compatibility with userspace software using
the pre-existing xfs ioctls.

Signed-off-by: default avatarMark Fasheh <mark.fasheh@oracle.com>
parent 063c4561

fs/ocfs2/file.c

+169 −13
Original line number Diff line number Diff line
@@ -1111,17 +1111,16 @@ out: 
	return ret;

}



static int ocfs2_write_remove_suid(struct inode *inode)

static int __ocfs2_write_remove_suid(struct inode *inode,

				     struct buffer_head *bh)

{

	int ret;

	struct buffer_head *bh = NULL;

	struct ocfs2_inode_info *oi = OCFS2_I(inode);

	handle_t *handle;

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

	struct ocfs2_dinode *di;



	mlog_entry("(Inode %llu, mode 0%o)\n",

		   (unsigned long long)oi->ip_blkno, inode->i_mode);

		   (unsigned long long)OCFS2_I(inode)->ip_blkno, inode->i_mode);



	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);

	if (handle == NULL) {
@@ -1130,17 +1129,11 @@ static int ocfs2_write_remove_suid(struct inode *inode) 
		goto out;

	}



	ret = ocfs2_read_block(osb, oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode);

	if (ret < 0) {

		mlog_errno(ret);

		goto out_trans;

	}



	ret = ocfs2_journal_access(handle, inode, bh,

				   OCFS2_JOURNAL_ACCESS_WRITE);

	if (ret < 0) {

		mlog_errno(ret);

		goto out_bh;

		goto out_trans;

	}



	inode->i_mode &= ~S_ISUID;
@@ -1153,8 +1146,7 @@ static int ocfs2_write_remove_suid(struct inode *inode) 
	ret = ocfs2_journal_dirty(handle, bh);

	if (ret < 0)

		mlog_errno(ret);

out_bh:

	brelse(bh);



out_trans:

	ocfs2_commit_trans(osb, handle);

out:
@@ -1200,6 +1192,25 @@ out: 
	return ret;

}



static int ocfs2_write_remove_suid(struct inode *inode)

{

	int ret;

	struct buffer_head *bh = NULL;

	struct ocfs2_inode_info *oi = OCFS2_I(inode);



	ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),

			       oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode);

	if (ret < 0) {

		mlog_errno(ret);

		goto out;

	}



	ret =  __ocfs2_write_remove_suid(inode, bh);

out:

	brelse(bh);

	return ret;

}



/*

 * Allocate enough extents to cover the region starting at byte offset

 * start for len bytes. Existing extents are skipped, any extents
@@ -1490,6 +1501,151 @@ out: 
	return ret;

}



/*

 * Parts of this function taken from xfs_change_file_space()

 */

int ocfs2_change_file_space(struct file *file, unsigned int cmd,

			    struct ocfs2_space_resv *sr)

{

	int ret;

	s64 llen;

	struct inode *inode = file->f_path.dentry->d_inode;

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

	struct buffer_head *di_bh = NULL;

	handle_t *handle;

	unsigned long long max_off = ocfs2_max_file_offset(inode->i_sb->s_blocksize_bits);



	if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&

	    !ocfs2_writes_unwritten_extents(osb))

		return -ENOTTY;

	else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&

		 !ocfs2_sparse_alloc(osb))

		return -ENOTTY;



	if (!S_ISREG(inode->i_mode))

		return -EINVAL;



	if (!(file->f_mode & FMODE_WRITE))

		return -EBADF;



	if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))

		return -EROFS;



	mutex_lock(&inode->i_mutex);



	/*

	 * This prevents concurrent writes on other nodes

	 */

	ret = ocfs2_rw_lock(inode, 1);

	if (ret) {

		mlog_errno(ret);

		goto out;

	}



	ret = ocfs2_meta_lock(inode, &di_bh, 1);

	if (ret) {

		mlog_errno(ret);

		goto out_rw_unlock;

	}



	if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {

		ret = -EPERM;

		goto out_meta_unlock;

	}



	switch (sr->l_whence) {

	case 0: /*SEEK_SET*/

		break;

	case 1: /*SEEK_CUR*/

		sr->l_start += file->f_pos;

		break;

	case 2: /*SEEK_END*/

		sr->l_start += i_size_read(inode);

		break;

	default:

		ret = -EINVAL;

		goto out_meta_unlock;

	}

	sr->l_whence = 0;



	llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len;



	if (sr->l_start < 0

	    || sr->l_start > max_off

	    || (sr->l_start + llen) < 0

	    || (sr->l_start + llen) > max_off) {

		ret = -EINVAL;

		goto out_meta_unlock;

	}



	if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) {

		if (sr->l_len <= 0) {

			ret = -EINVAL;

			goto out_meta_unlock;

		}

	}



	if (should_remove_suid(file->f_path.dentry)) {

		ret = __ocfs2_write_remove_suid(inode, di_bh);

		if (ret) {

			mlog_errno(ret);

			goto out_meta_unlock;

		}

	}



	down_write(&OCFS2_I(inode)->ip_alloc_sem);

	switch (cmd) {

	case OCFS2_IOC_RESVSP:

	case OCFS2_IOC_RESVSP64:

		/*

		 * This takes unsigned offsets, but the signed ones we

		 * pass have been checked against overflow above.

		 */

		ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,

						       sr->l_len);

		break;

	case OCFS2_IOC_UNRESVSP:

	case OCFS2_IOC_UNRESVSP64:

		ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,

					       sr->l_len);

		break;

	default:

		ret = -EINVAL;

	}

	up_write(&OCFS2_I(inode)->ip_alloc_sem);

	if (ret) {

		mlog_errno(ret);

		goto out_meta_unlock;

	}



	/*

	 * We update c/mtime for these changes

	 */

	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);

	if (IS_ERR(handle)) {

		ret = PTR_ERR(handle);

		mlog_errno(ret);

		goto out_meta_unlock;

	}



	inode->i_ctime = inode->i_mtime = CURRENT_TIME;

	ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);

	if (ret < 0)

		mlog_errno(ret);



	ocfs2_commit_trans(osb, handle);



out_meta_unlock:

	brelse(di_bh);

	ocfs2_meta_unlock(inode, 1);

out_rw_unlock:

	ocfs2_rw_unlock(inode, 1);



	mutex_unlock(&inode->i_mutex);

out:

	return ret;

}



static int ocfs2_prepare_inode_for_write(struct dentry *dentry,

					 loff_t *ppos,

					 size_t count,

fs/ocfs2/file.h

+3 −0
Original line number Diff line number Diff line
@@ -62,4 +62,7 @@ int ocfs2_should_update_atime(struct inode *inode, 
int ocfs2_update_inode_atime(struct inode *inode,

			     struct buffer_head *bh);



int ocfs2_change_file_space(struct file *file, unsigned int cmd,

			    struct ocfs2_space_resv *sr);



#endif /* OCFS2_FILE_H */

fs/ocfs2/ioctl.c

+15 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 
#include "ocfs2.h"

#include "alloc.h"

#include "dlmglue.h"

#include "file.h"

#include "inode.h"

#include "journal.h"
@@ -115,6 +116,7 @@ int ocfs2_ioctl(struct inode * inode, struct file * filp, 
{

	unsigned int flags;

	int status;

	struct ocfs2_space_resv sr;



	switch (cmd) {

	case OCFS2_IOC_GETFLAGS:
@@ -130,6 +132,14 @@ int ocfs2_ioctl(struct inode * inode, struct file * filp, 


		return ocfs2_set_inode_attr(inode, flags,

			OCFS2_FL_MODIFIABLE);

	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);

	default:

		return -ENOTTY;

	}
@@ -148,6 +158,11 @@ long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg) 
	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:

		break;

	default:

		return -ENOIOCTLCMD;

	}

fs/ocfs2/ocfs2_fs.h

+26 −0
Original line number Diff line number Diff line
@@ -174,6 +174,32 @@ 
#define OCFS2_IOC32_GETFLAGS	_IOR('f', 1, int)

#define OCFS2_IOC32_SETFLAGS	_IOW('f', 2, int)



/*

 * Space reservation / allocation / free ioctls and argument structure

 * are designed to be compatible with XFS.

 *

 * ALLOCSP* and FREESP* are not and will never be supported, but are

 * included here for completeness.

 */

struct ocfs2_space_resv {

	__s16		l_type;

	__s16		l_whence;

	__s64		l_start;

	__s64		l_len;		/* len == 0 means until end of file */

	__s32		l_sysid;

	__u32		l_pid;

	__s32		l_pad[4];	/* reserve area			    */

};



#define OCFS2_IOC_ALLOCSP		_IOW ('X', 10, struct ocfs2_space_resv)

#define OCFS2_IOC_FREESP		_IOW ('X', 11, struct ocfs2_space_resv)

#define OCFS2_IOC_RESVSP		_IOW ('X', 40, struct ocfs2_space_resv)

#define OCFS2_IOC_UNRESVSP	_IOW ('X', 41, struct ocfs2_space_resv)

#define OCFS2_IOC_ALLOCSP64	_IOW ('X', 36, struct ocfs2_space_resv)

#define OCFS2_IOC_FREESP64	_IOW ('X', 37, struct ocfs2_space_resv)

#define OCFS2_IOC_RESVSP64	_IOW ('X', 42, struct ocfs2_space_resv)

#define OCFS2_IOC_UNRESVSP64	_IOW ('X', 43, struct ocfs2_space_resv)



/*

 * Journal Flags (ocfs2_dinode.id1.journal1.i_flags)

 */

fs/ocfs2/super.c

+1 −3
Original line number Diff line number Diff line
@@ -115,8 +115,6 @@ static void ocfs2_write_super(struct super_block *sb); 
static struct inode *ocfs2_alloc_inode(struct super_block *sb);

static void ocfs2_destroy_inode(struct inode *inode);



static unsigned long long ocfs2_max_file_offset(unsigned int blockshift);



static const struct super_operations ocfs2_sops = {

	.statfs		= ocfs2_statfs,

	.alloc_inode	= ocfs2_alloc_inode,
@@ -321,7 +319,7 @@ static void ocfs2_destroy_inode(struct inode *inode) 
/* From xfs_super.c:xfs_max_file_offset

 * Copyright (c) 2000-2004 Silicon Graphics, Inc.

 */

static unsigned long long ocfs2_max_file_offset(unsigned int blockshift)

unsigned long long ocfs2_max_file_offset(unsigned int blockshift)

{

	unsigned int pagefactor = 1;

	unsigned int bitshift = BITS_PER_LONG - 1;

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