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fs/xfs/xfs_extfree_item.h
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/* |
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* Copyright (c) 2000,2005 Silicon Graphics, Inc. * All Rights Reserved. |
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* |
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* This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation. * |
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* This program is distributed in the hope that it would be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License * along with this program; if not, write the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ #ifndef __XFS_EXTFREE_ITEM_H__ #define __XFS_EXTFREE_ITEM_H__ |
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/* kernel only EFI/EFD definitions */ |
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struct xfs_mount; struct kmem_zone; |
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/* * Max number of extents in fast allocation path. */ #define XFS_EFI_MAX_FAST_EXTENTS 16 /* |
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* Define EFI flag bits. Manipulated by set/clear/test_bit operators. |
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*/ |
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#define XFS_EFI_RECOVERED 1 |
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/* |
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* This is the "extent free intention" log item. It is used to log the fact * that some extents need to be free. It is used in conjunction with the * "extent free done" log item described below. * * The EFI is reference counted so that it is not freed prior to both the EFI |
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* and EFD being committed and unpinned. This ensures the EFI is inserted into * the AIL even in the event of out of order EFI/EFD processing. In other words, * an EFI is born with two references: * * 1.) an EFI held reference to track EFI AIL insertion * 2.) an EFD held reference to track EFD commit * * On allocation, both references are the responsibility of the caller. Once the * EFI is added to and dirtied in a transaction, ownership of reference one * transfers to the transaction. The reference is dropped once the EFI is * inserted to the AIL or in the event of failure along the way (e.g., commit * failure, log I/O error, etc.). Note that the caller remains responsible for * the EFD reference under all circumstances to this point. The caller has no * means to detect failure once the transaction is committed, however. * Therefore, an EFD is required after this point, even in the event of * unrelated failure. * * Once an EFD is allocated and dirtied in a transaction, reference two * transfers to the transaction. The EFD reference is dropped once it reaches * the unpin handler. Similar to the EFI, the reference also drops in the event * of commit failure or log I/O errors. Note that the EFD is not inserted in the * AIL, so at this point both the EFI and EFD are freed. |
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*/ typedef struct xfs_efi_log_item { xfs_log_item_t efi_item; |
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atomic_t efi_refcount; |
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atomic_t efi_next_extent; unsigned long efi_flags; /* misc flags */ |
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xfs_efi_log_format_t efi_format; } xfs_efi_log_item_t; /* * This is the "extent free done" log item. It is used to log * the fact that some extents earlier mentioned in an efi item * have been freed. */ typedef struct xfs_efd_log_item { xfs_log_item_t efd_item; xfs_efi_log_item_t *efd_efip; uint efd_next_extent; xfs_efd_log_format_t efd_format; } xfs_efd_log_item_t; /* * Max number of extents in fast allocation path. */ #define XFS_EFD_MAX_FAST_EXTENTS 16 extern struct kmem_zone *xfs_efi_zone; extern struct kmem_zone *xfs_efd_zone; xfs_efi_log_item_t *xfs_efi_init(struct xfs_mount *, uint); xfs_efd_log_item_t *xfs_efd_init(struct xfs_mount *, xfs_efi_log_item_t *, uint); |
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int xfs_efi_copy_format(xfs_log_iovec_t *buf, xfs_efi_log_format_t *dst_efi_fmt); |
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void xfs_efi_item_free(xfs_efi_log_item_t *); |
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void xfs_efi_release(struct xfs_efi_log_item *); |
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int xfs_efi_recover(struct xfs_mount *mp, struct xfs_efi_log_item *efip); |
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#endif /* __XFS_EXTFREE_ITEM_H__ */ |