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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
18#ifndef __XFS_EXTFREE_ITEM_H__
19#define __XFS_EXTFREE_ITEM_H__
20
Dave Chinner9fbe24d2013-08-12 20:49:25 +100021/* kernel only EFI/EFD definitions */
22
Linus Torvalds1da177e2005-04-16 15:20:36 -070023struct xfs_mount;
24struct kmem_zone;
25
Linus Torvalds1da177e2005-04-16 15:20:36 -070026/*
27 * Max number of extents in fast allocation path.
28 */
29#define XFS_EFI_MAX_FAST_EXTENTS 16
30
31/*
Dave Chinnerb199c8a2010-12-20 11:59:49 +110032 * Define EFI flag bits. Manipulated by set/clear/test_bit operators.
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 */
Dave Chinnerb199c8a2010-12-20 11:59:49 +110034#define XFS_EFI_RECOVERED 1
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36/*
Dave Chinner666d6442013-04-03 14:09:21 +110037 * This is the "extent free intention" log item. It is used to log the fact
38 * that some extents need to be free. It is used in conjunction with the
39 * "extent free done" log item described below.
40 *
41 * The EFI is reference counted so that it is not freed prior to both the EFI
Brian Foster8d99fe92015-08-19 09:51:16 +100042 * and EFD being committed and unpinned. This ensures the EFI is inserted into
43 * the AIL even in the event of out of order EFI/EFD processing. In other words,
44 * an EFI is born with two references:
45 *
46 * 1.) an EFI held reference to track EFI AIL insertion
47 * 2.) an EFD held reference to track EFD commit
48 *
49 * On allocation, both references are the responsibility of the caller. Once the
50 * EFI is added to and dirtied in a transaction, ownership of reference one
51 * transfers to the transaction. The reference is dropped once the EFI is
52 * inserted to the AIL or in the event of failure along the way (e.g., commit
53 * failure, log I/O error, etc.). Note that the caller remains responsible for
54 * the EFD reference under all circumstances to this point. The caller has no
55 * means to detect failure once the transaction is committed, however.
56 * Therefore, an EFD is required after this point, even in the event of
57 * unrelated failure.
58 *
59 * Once an EFD is allocated and dirtied in a transaction, reference two
60 * transfers to the transaction. The EFD reference is dropped once it reaches
61 * the unpin handler. Similar to the EFI, the reference also drops in the event
62 * of commit failure or log I/O errors. Note that the EFD is not inserted in the
63 * AIL, so at this point both the EFI and EFD are freed.
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 */
65typedef struct xfs_efi_log_item {
66 xfs_log_item_t efi_item;
Dave Chinner666d6442013-04-03 14:09:21 +110067 atomic_t efi_refcount;
Dave Chinnerb199c8a2010-12-20 11:59:49 +110068 atomic_t efi_next_extent;
69 unsigned long efi_flags; /* misc flags */
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 xfs_efi_log_format_t efi_format;
71} xfs_efi_log_item_t;
72
73/*
74 * This is the "extent free done" log item. It is used to log
75 * the fact that some extents earlier mentioned in an efi item
76 * have been freed.
77 */
78typedef struct xfs_efd_log_item {
79 xfs_log_item_t efd_item;
80 xfs_efi_log_item_t *efd_efip;
81 uint efd_next_extent;
82 xfs_efd_log_format_t efd_format;
83} xfs_efd_log_item_t;
84
85/*
86 * Max number of extents in fast allocation path.
87 */
88#define XFS_EFD_MAX_FAST_EXTENTS 16
89
90extern struct kmem_zone *xfs_efi_zone;
91extern struct kmem_zone *xfs_efd_zone;
92
93xfs_efi_log_item_t *xfs_efi_init(struct xfs_mount *, uint);
94xfs_efd_log_item_t *xfs_efd_init(struct xfs_mount *, xfs_efi_log_item_t *,
95 uint);
Tim Shimmin6d192a92006-06-09 14:55:38 +100096int xfs_efi_copy_format(xfs_log_iovec_t *buf,
97 xfs_efi_log_format_t *dst_efi_fmt);
Christoph Hellwig7d795ca2005-06-21 15:41:19 +100098void xfs_efi_item_free(xfs_efi_log_item_t *);
Brian Foster5e4b5382015-08-19 09:50:12 +100099void xfs_efi_release(struct xfs_efi_log_item *);
Christoph Hellwig7d795ca2005-06-21 15:41:19 +1000100
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101#endif /* __XFS_EXTFREE_ITEM_H__ */