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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_types.h"
21 #include "xfs_log.h"
22 #include "xfs_inum.h"
23 #include "xfs_trans.h"
24 #include "xfs_sb.h"
25 #include "xfs_ag.h"
26 #include "xfs_mount.h"
27 #include "xfs_trans_priv.h"
28 #include "xfs_extfree_item.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  */
36 xfs_efi_log_item_t *
xfs_trans_get_efi(xfs_trans_t * tp,uint nextents)37 xfs_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  */
60 void
xfs_trans_log_efi_extent(xfs_trans_t * tp,xfs_efi_log_item_t * efip,xfs_fsblock_t start_block,xfs_extlen_t ext_len)61 xfs_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  */
91 xfs_efd_log_item_t *
xfs_trans_get_efd(xfs_trans_t * tp,xfs_efi_log_item_t * efip,uint nextents)92 xfs_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  * This routine is called to indicate that the described
113  * extent is to be logged as having been freed.  It should
114  * be called once for each extent freed.
115  */
116 void
xfs_trans_log_efd_extent(xfs_trans_t * tp,xfs_efd_log_item_t * efdp,xfs_fsblock_t start_block,xfs_extlen_t ext_len)117 xfs_trans_log_efd_extent(xfs_trans_t		*tp,
118 			 xfs_efd_log_item_t	*efdp,
119 			 xfs_fsblock_t		start_block,
120 			 xfs_extlen_t		ext_len)
121 {
122 	uint			next_extent;
123 	xfs_extent_t		*extp;
124 
125 	tp->t_flags |= XFS_TRANS_DIRTY;
126 	efdp->efd_item.li_desc->lid_flags |= XFS_LID_DIRTY;
127 
128 	next_extent = efdp->efd_next_extent;
129 	ASSERT(next_extent < efdp->efd_format.efd_nextents);
130 	extp = &(efdp->efd_format.efd_extents[next_extent]);
131 	extp->ext_start = start_block;
132 	extp->ext_len = ext_len;
133 	efdp->efd_next_extent++;
134 }
135