linux/fs/xfs/xfs_rtalloc.h
Darrick J. Wong 2d5f216b77 xfs: convert rt extent numbers to xfs_rtxnum_t
Further disambiguate the xfs_rtblock_t uses by creating a new type,
xfs_rtxnum_t, to store the position of an extent within the realtime
section, in units of rtextents.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
2023-10-17 16:24:22 -07:00

97 lines
2.7 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
* All Rights Reserved.
*/
#ifndef __XFS_RTALLOC_H__
#define __XFS_RTALLOC_H__
/* kernel only definitions and functions */
struct xfs_mount;
struct xfs_trans;
#ifdef CONFIG_XFS_RT
/*
* Function prototypes for exported functions.
*/
/*
* Allocate an extent in the realtime subvolume, with the usual allocation
* parameters. The length units are all in realtime extents, as is the
* result block number.
*/
int /* error */
xfs_rtallocate_extent(
struct xfs_trans *tp, /* transaction pointer */
xfs_rtxnum_t start, /* starting rtext number to allocate */
xfs_rtxlen_t minlen, /* minimum length to allocate */
xfs_rtxlen_t maxlen, /* maximum length to allocate */
xfs_rtxlen_t *len, /* out: actual length allocated */
int wasdel, /* was a delayed allocation extent */
xfs_rtxlen_t prod, /* extent product factor */
xfs_rtxnum_t *rtblock); /* out: start rtext allocated */
/*
* Initialize realtime fields in the mount structure.
*/
int /* error */
xfs_rtmount_init(
struct xfs_mount *mp); /* file system mount structure */
void
xfs_rtunmount_inodes(
struct xfs_mount *mp);
/*
* Get the bitmap and summary inodes into the mount structure
* at mount time.
*/
int /* error */
xfs_rtmount_inodes(
struct xfs_mount *mp); /* file system mount structure */
/*
* Pick an extent for allocation at the start of a new realtime file.
* Use the sequence number stored in the atime field of the bitmap inode.
* Translate this to a fraction of the rtextents, and return the product
* of rtextents and the fraction.
* The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
*/
int /* error */
xfs_rtpick_extent(
struct xfs_mount *mp, /* file system mount point */
struct xfs_trans *tp, /* transaction pointer */
xfs_rtxlen_t len, /* allocation length (rtextents) */
xfs_rtxnum_t *pick); /* result rt extent */
/*
* Grow the realtime area of the filesystem.
*/
int
xfs_growfs_rt(
struct xfs_mount *mp, /* file system mount structure */
xfs_growfs_rt_t *in); /* user supplied growfs struct */
int xfs_rtalloc_reinit_frextents(struct xfs_mount *mp);
#else
# define xfs_rtallocate_extent(t,b,min,max,l,f,p,rb) (-ENOSYS)
# define xfs_rtpick_extent(m,t,l,rb) (-ENOSYS)
# define xfs_growfs_rt(mp,in) (-ENOSYS)
# define xfs_rtalloc_reinit_frextents(m) (0)
static inline int /* error */
xfs_rtmount_init(
xfs_mount_t *mp) /* file system mount structure */
{
if (mp->m_sb.sb_rblocks == 0)
return 0;
xfs_warn(mp, "Not built with CONFIG_XFS_RT");
return -ENOSYS;
}
# define xfs_rtmount_inodes(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (-ENOSYS))
# define xfs_rtunmount_inodes(m)
#endif /* CONFIG_XFS_RT */
#endif /* __XFS_RTALLOC_H__ */