1/* 2 * Copyright (c) 2000,2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it would be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18#include "xfs.h" 19#include "xfs_fs.h" 20#include "xfs_shared.h" 21#include "xfs_format.h" 22#include "xfs_log_format.h" 23#include "xfs_trans_resv.h" 24#include "xfs_mount.h" 25#include "xfs_trans.h" 26#include "xfs_trans_priv.h" 27#include "xfs_extfree_item.h" 28#include "xfs_alloc.h" 29 30/* 31 * This routine is called to allocate an "extent free intention" 32 * log item that will hold nextents worth of extents. The 33 * caller must use all nextents extents, because we are not 34 * flexible about this at all. 35 */ 36xfs_efi_log_item_t * 37xfs_trans_get_efi(xfs_trans_t *tp, 38 uint nextents) 39{ 40 xfs_efi_log_item_t *efip; 41 42 ASSERT(tp != NULL); 43 ASSERT(nextents > 0); 44 45 efip = xfs_efi_init(tp->t_mountp, nextents); 46 ASSERT(efip != NULL); 47 48 /* 49 * Get a log_item_desc to point at the new item. 50 */ 51 xfs_trans_add_item(tp, &efip->efi_item); 52 return efip; 53} 54 55/* 56 * This routine is called to indicate that the described 57 * extent is to be logged as needing to be freed. It should 58 * be called once for each extent to be freed. 59 */ 60void 61xfs_trans_log_efi_extent(xfs_trans_t *tp, 62 xfs_efi_log_item_t *efip, 63 xfs_fsblock_t start_block, 64 xfs_extlen_t ext_len) 65{ 66 uint next_extent; 67 xfs_extent_t *extp; 68 69 tp->t_flags |= XFS_TRANS_DIRTY; 70 efip->efi_item.li_desc->lid_flags |= XFS_LID_DIRTY; 71 72 /* 73 * atomic_inc_return gives us the value after the increment; 74 * we want to use it as an array index so we need to subtract 1 from 75 * it. 76 */ 77 next_extent = atomic_inc_return(&efip->efi_next_extent) - 1; 78 ASSERT(next_extent < efip->efi_format.efi_nextents); 79 extp = &(efip->efi_format.efi_extents[next_extent]); 80 extp->ext_start = start_block; 81 extp->ext_len = ext_len; 82} 83 84 85/* 86 * This routine is called to allocate an "extent free done" 87 * log item that will hold nextents worth of extents. The 88 * caller must use all nextents extents, because we are not 89 * flexible about this at all. 90 */ 91xfs_efd_log_item_t * 92xfs_trans_get_efd(xfs_trans_t *tp, 93 xfs_efi_log_item_t *efip, 94 uint nextents) 95{ 96 xfs_efd_log_item_t *efdp; 97 98 ASSERT(tp != NULL); 99 ASSERT(nextents > 0); 100 101 efdp = xfs_efd_init(tp->t_mountp, efip, nextents); 102 ASSERT(efdp != NULL); 103 104 /* 105 * Get a log_item_desc to point at the new item. 106 */ 107 xfs_trans_add_item(tp, &efdp->efd_item); 108 return efdp; 109} 110 111/* 112 * Free an extent and log it to the EFD. Note that the transaction is marked 113 * dirty regardless of whether the extent free succeeds or fails to support the 114 * EFI/EFD lifecycle rules. 115 */ 116int 117xfs_trans_free_extent( 118 struct xfs_trans *tp, 119 struct xfs_efd_log_item *efdp, 120 xfs_fsblock_t start_block, 121 xfs_extlen_t ext_len) 122{ 123 uint next_extent; 124 struct xfs_extent *extp; 125 int error; 126 127 error = xfs_free_extent(tp, start_block, ext_len); 128 129 /* 130 * Mark the transaction dirty, even on error. This ensures the 131 * transaction is aborted, which: 132 * 133 * 1.) releases the EFI and frees the EFD 134 * 2.) shuts down the filesystem 135 */ 136 tp->t_flags |= XFS_TRANS_DIRTY; 137 efdp->efd_item.li_desc->lid_flags |= XFS_LID_DIRTY; 138 139 next_extent = efdp->efd_next_extent; 140 ASSERT(next_extent < efdp->efd_format.efd_nextents); 141 extp = &(efdp->efd_format.efd_extents[next_extent]); 142 extp->ext_start = start_block; 143 extp->ext_len = ext_len; 144 efdp->efd_next_extent++; 145 146 return error; 147} 148