Commit 99b6436b authored by Zhi Yong Wu's avatar Zhi Yong Wu Committed by Ben Myers
Browse files

xfs: add O_TMPFILE support 



Add two functions xfs_create_tmpfile() and xfs_vn_tmpfile()
to support O_TMPFILE file creation.

In contrast to xfs_create(), xfs_create_tmpfile() has a different
log reservation to the regular file creation because there is no
directory modification, and doesn't check if an entry can be added
to the directory, but the reservation quotas is required appropriately,
and finally its inode is added to the unlinked list.

xfs_vn_tmpfile() add one O_TMPFILE method to VFS interface and directly
invoke xfs_create_tmpfile().

Signed-off-by: default avatarZhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Reviewed-by: default avatarDave Chinner <dchinner@redhat.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarBen Myers <bpm@sgi.com>
parent 163467d3

fs/xfs/xfs_inode.c

+107 −0
Original line number Diff line number Diff line
@@ -1332,6 +1332,113 @@ xfs_create( 
	return error;

}



int

xfs_create_tmpfile(

	struct xfs_inode	*dp,

	struct dentry		*dentry,

	umode_t			mode)

{

	struct xfs_mount	*mp = dp->i_mount;

	struct xfs_inode	*ip = NULL;

	struct xfs_trans	*tp = NULL;

	int			error;

	uint			cancel_flags = XFS_TRANS_RELEASE_LOG_RES;

	prid_t                  prid;

	struct xfs_dquot	*udqp = NULL;

	struct xfs_dquot	*gdqp = NULL;

	struct xfs_dquot	*pdqp = NULL;

	struct xfs_trans_res	*tres;

	uint			resblks;



	if (XFS_FORCED_SHUTDOWN(mp))

		return XFS_ERROR(EIO);



	prid = xfs_get_initial_prid(dp);



	/*

	 * Make sure that we have allocated dquot(s) on disk.

	 */

	error = xfs_qm_vop_dqalloc(dp, xfs_kuid_to_uid(current_fsuid()),

				xfs_kgid_to_gid(current_fsgid()), prid,

				XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,

				&udqp, &gdqp, &pdqp);

	if (error)

		return error;



	resblks = XFS_IALLOC_SPACE_RES(mp);

	tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE_TMPFILE);



	tres = &M_RES(mp)->tr_create_tmpfile;

	error = xfs_trans_reserve(tp, tres, resblks, 0);

	if (error == ENOSPC) {

		/* No space at all so try a "no-allocation" reservation */

		resblks = 0;

		error = xfs_trans_reserve(tp, tres, 0, 0);

	}

	if (error) {

		cancel_flags = 0;

		goto out_trans_cancel;

	}



	error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp,

						pdqp, resblks, 1, 0);

	if (error)

		goto out_trans_cancel;



	error = xfs_dir_ialloc(&tp, dp, mode, 1, 0,

				prid, resblks > 0, &ip, NULL);

	if (error) {

		if (error == ENOSPC)

			goto out_trans_cancel;

		goto out_trans_abort;

	}



	if (mp->m_flags & XFS_MOUNT_WSYNC)

		xfs_trans_set_sync(tp);



	/*

	 * Attach the dquot(s) to the inodes and modify them incore.

	 * These ids of the inode couldn't have changed since the new

	 * inode has been locked ever since it was created.

	 */

	xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);



	ip->i_d.di_nlink--;

	d_tmpfile(dentry, VFS_I(ip));

	error = xfs_iunlink(tp, ip);

	if (error)

		goto out_trans_abort;



	error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);

	if (error)

		goto out_release_inode;



	xfs_qm_dqrele(udqp);

	xfs_qm_dqrele(gdqp);

	xfs_qm_dqrele(pdqp);



	return 0;



 out_trans_abort:

	cancel_flags |= XFS_TRANS_ABORT;

 out_trans_cancel:

	xfs_trans_cancel(tp, cancel_flags);

 out_release_inode:

	/*

	 * Wait until after the current transaction is aborted to

	 * release the inode.  This prevents recursive transactions

	 * and deadlocks from xfs_inactive.

	 */

	if (ip)

		IRELE(ip);



	xfs_qm_dqrele(udqp);

	xfs_qm_dqrele(gdqp);

	xfs_qm_dqrele(pdqp);



	return error;

}



int

xfs_link(

	xfs_inode_t		*tdp,

fs/xfs/xfs_inode.h

+2 −0
Original line number Diff line number Diff line
@@ -333,6 +333,8 @@ int xfs_lookup(struct xfs_inode *dp, struct xfs_name *name, 
			   struct xfs_inode **ipp, struct xfs_name *ci_name);

int		xfs_create(struct xfs_inode *dp, struct xfs_name *name,

			   umode_t mode, xfs_dev_t rdev, struct xfs_inode **ipp);

int		xfs_create_tmpfile(struct xfs_inode *dp, struct dentry *dentry,

			   umode_t mode);

int		xfs_remove(struct xfs_inode *dp, struct xfs_name *name,

			   struct xfs_inode *ip);

int		xfs_link(struct xfs_inode *tdp, struct xfs_inode *sip,

fs/xfs/xfs_iops.c

+16 −0
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ 
#include "xfs_da_btree.h"

#include "xfs_dir2_priv.h"

#include "xfs_dinode.h"

#include "xfs_trans_space.h"



#include <linux/capability.h>

#include <linux/xattr.h>
@@ -1043,6 +1044,19 @@ xfs_vn_fiemap( 
	return 0;

}



STATIC int

xfs_vn_tmpfile(

	struct inode	*dir,

	struct dentry	*dentry,

	umode_t		mode)

{

	int		error;



	error = xfs_create_tmpfile(XFS_I(dir), dentry, mode);



	return -error;

}



static const struct inode_operations xfs_inode_operations = {

	.get_acl		= xfs_get_acl,

	.getattr		= xfs_vn_getattr,
@@ -1079,6 +1093,7 @@ static const struct inode_operations xfs_dir_inode_operations = { 
	.removexattr		= generic_removexattr,

	.listxattr		= xfs_vn_listxattr,

	.update_time		= xfs_vn_update_time,

	.tmpfile		= xfs_vn_tmpfile,

};



static const struct inode_operations xfs_dir_ci_inode_operations = {
@@ -1105,6 +1120,7 @@ static const struct inode_operations xfs_dir_ci_inode_operations = { 
	.removexattr		= generic_removexattr,

	.listxattr		= xfs_vn_listxattr,

	.update_time		= xfs_vn_update_time,

	.tmpfile		= xfs_vn_tmpfile,

};



static const struct inode_operations xfs_symlink_inode_operations = {

fs/xfs/xfs_shared.h

+3 −1
Original line number Diff line number Diff line
@@ -104,7 +104,8 @@ extern const struct xfs_buf_ops xfs_symlink_buf_ops; 
#define	XFS_TRANS_SB_COUNT		41

#define	XFS_TRANS_CHECKPOINT		42

#define	XFS_TRANS_ICREATE		43

#define	XFS_TRANS_TYPE_MAX		43

#define	XFS_TRANS_CREATE_TMPFILE	44

#define	XFS_TRANS_TYPE_MAX		44

/* new transaction types need to be reflected in xfs_logprint(8) */



#define XFS_TRANS_TYPES \
@@ -112,6 +113,7 @@ extern const struct xfs_buf_ops xfs_symlink_buf_ops; 
	{ XFS_TRANS_SETATTR_SIZE,	"SETATTR_SIZE" }, \

	{ XFS_TRANS_INACTIVE,		"INACTIVE" }, \

	{ XFS_TRANS_CREATE,		"CREATE" }, \

	{ XFS_TRANS_CREATE_TMPFILE,	"CREATE_TMPFILE" }, \

	{ XFS_TRANS_CREATE_TRUNC,	"CREATE_TRUNC" }, \

	{ XFS_TRANS_TRUNCATE_FILE,	"TRUNCATE_FILE" }, \

	{ XFS_TRANS_REMOVE,		"REMOVE" }, \

fs/xfs/xfs_trans_resv.c

+34 −2
Original line number Diff line number Diff line
@@ -228,6 +228,18 @@ xfs_calc_link_reservation( 
				      XFS_FSB_TO_B(mp, 1))));

}



/*

 * For adding an inode to unlinked list we can modify:

 *    the agi hash list: sector size

 *    the unlinked inode: inode size

 */

STATIC uint

xfs_calc_iunlink_add_reservation(xfs_mount_t *mp)

{

	return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +

		xfs_calc_inode_res(mp, 1);

}



/*

 * For removing a directory entry we can modify:

 *    the parent directory inode: inode size
@@ -245,10 +257,11 @@ xfs_calc_remove_reservation( 
	struct xfs_mount	*mp)

{

	return XFS_DQUOT_LOGRES(mp) +

		MAX((xfs_calc_inode_res(mp, 2) +

		xfs_calc_iunlink_add_reservation(mp) +

		MAX((xfs_calc_inode_res(mp, 1) +

		     xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp),

				      XFS_FSB_TO_B(mp, 1))),

		    (xfs_calc_buf_res(5, mp->m_sb.sb_sectsize) +

		    (xfs_calc_buf_res(4, mp->m_sb.sb_sectsize) +

		     xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 2),

				      XFS_FSB_TO_B(mp, 1))));

}
@@ -343,6 +356,20 @@ xfs_calc_create_reservation( 


}



STATIC uint

xfs_calc_create_tmpfile_reservation(

	struct xfs_mount        *mp)

{

	uint	res = XFS_DQUOT_LOGRES(mp);



	if (xfs_sb_version_hascrc(&mp->m_sb))

		res += xfs_calc_icreate_resv_alloc(mp);

	else

		res += xfs_calc_create_resv_alloc(mp);



	return res + xfs_calc_iunlink_add_reservation(mp);

}



/*

 * Making a new directory is the same as creating a new file.

 */
@@ -729,6 +756,11 @@ xfs_trans_resv_calc( 
	resp->tr_create.tr_logcount = XFS_CREATE_LOG_COUNT;

	resp->tr_create.tr_logflags |= XFS_TRANS_PERM_LOG_RES;



	resp->tr_create_tmpfile.tr_logres =

			xfs_calc_create_tmpfile_reservation(mp);

	resp->tr_create_tmpfile.tr_logcount = XFS_CREATE_TMPFILE_LOG_COUNT;

	resp->tr_create_tmpfile.tr_logflags |= XFS_TRANS_PERM_LOG_RES;



	resp->tr_mkdir.tr_logres = xfs_calc_mkdir_reservation(mp);

	resp->tr_mkdir.tr_logcount = XFS_MKDIR_LOG_COUNT;

	resp->tr_mkdir.tr_logflags |= XFS_TRANS_PERM_LOG_RES;

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