1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. 4 * All Rights Reserved. 5 */ 6 #ifndef __XFS_RTALLOC_H__ 7 #define __XFS_RTALLOC_H__ 8 9 /* kernel only definitions and functions */ 10 11 struct xfs_mount; 12 struct xfs_trans; 13 14 #ifdef CONFIG_XFS_RT 15 /* 16 * Function prototypes for exported functions. 17 */ 18 19 /* 20 * Allocate an extent in the realtime subvolume, with the usual allocation 21 * parameters. The length units are all in realtime extents, as is the 22 * result block number. 23 */ 24 int /* error */ 25 xfs_rtallocate_extent( 26 struct xfs_trans *tp, /* transaction pointer */ 27 xfs_rtxnum_t start, /* starting rtext number to allocate */ 28 xfs_rtxlen_t minlen, /* minimum length to allocate */ 29 xfs_rtxlen_t maxlen, /* maximum length to allocate */ 30 xfs_rtxlen_t *len, /* out: actual length allocated */ 31 int wasdel, /* was a delayed allocation extent */ 32 xfs_rtxlen_t prod, /* extent product factor */ 33 xfs_rtxnum_t *rtblock); /* out: start rtext allocated */ 34 35 36 /* 37 * Initialize realtime fields in the mount structure. 38 */ 39 int /* error */ 40 xfs_rtmount_init( 41 struct xfs_mount *mp); /* file system mount structure */ 42 void 43 xfs_rtunmount_inodes( 44 struct xfs_mount *mp); 45 46 /* 47 * Get the bitmap and summary inodes into the mount structure 48 * at mount time. 49 */ 50 int /* error */ 51 xfs_rtmount_inodes( 52 struct xfs_mount *mp); /* file system mount structure */ 53 54 /* 55 * Pick an extent for allocation at the start of a new realtime file. 56 * Use the sequence number stored in the atime field of the bitmap inode. 57 * Translate this to a fraction of the rtextents, and return the product 58 * of rtextents and the fraction. 59 * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ... 60 */ 61 int /* error */ 62 xfs_rtpick_extent( 63 struct xfs_mount *mp, /* file system mount point */ 64 struct xfs_trans *tp, /* transaction pointer */ 65 xfs_rtxlen_t len, /* allocation length (rtextents) */ 66 xfs_rtxnum_t *pick); /* result rt extent */ 67 68 /* 69 * Grow the realtime area of the filesystem. 70 */ 71 int 72 xfs_growfs_rt( 73 struct xfs_mount *mp, /* file system mount structure */ 74 xfs_growfs_rt_t *in); /* user supplied growfs struct */ 75 76 int xfs_rtalloc_reinit_frextents(struct xfs_mount *mp); 77 #else 78 # define xfs_rtallocate_extent(t,b,min,max,l,f,p,rb) (-ENOSYS) 79 # define xfs_rtpick_extent(m,t,l,rb) (-ENOSYS) 80 # define xfs_growfs_rt(mp,in) (-ENOSYS) 81 # define xfs_rtalloc_reinit_frextents(m) (0) 82 static inline int /* error */ 83 xfs_rtmount_init( 84 xfs_mount_t *mp) /* file system mount structure */ 85 { 86 if (mp->m_sb.sb_rblocks == 0) 87 return 0; 88 89 xfs_warn(mp, "Not built with CONFIG_XFS_RT"); 90 return -ENOSYS; 91 } 92 # define xfs_rtmount_inodes(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (-ENOSYS)) 93 # define xfs_rtunmount_inodes(m) 94 #endif /* CONFIG_XFS_RT */ 95 96 #endif /* __XFS_RTALLOC_H__ */ 97