diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/ocfs2/reservations.h')
| -rw-r--r-- | ANDROID_3.4.5/fs/ocfs2/reservations.h | 159 |
1 files changed, 0 insertions, 159 deletions
diff --git a/ANDROID_3.4.5/fs/ocfs2/reservations.h b/ANDROID_3.4.5/fs/ocfs2/reservations.h deleted file mode 100644 index 42c2b804..00000000 --- a/ANDROID_3.4.5/fs/ocfs2/reservations.h +++ /dev/null @@ -1,159 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * reservations.h - * - * Allocation reservations function prototypes and structures. - * - * Copyright (C) 2010 Novell. All rights reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public - * License version 2 as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will 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. - */ - -#ifndef OCFS2_RESERVATIONS_H -#define OCFS2_RESERVATIONS_H - -#include <linux/rbtree.h> - -#define OCFS2_DEFAULT_RESV_LEVEL 2 -#define OCFS2_MAX_RESV_LEVEL 9 -#define OCFS2_MIN_RESV_LEVEL 0 - -struct ocfs2_alloc_reservation { - struct rb_node r_node; - - unsigned int r_start; /* Beginning of current window */ - unsigned int r_len; /* Length of the window */ - - unsigned int r_last_len; /* Length of most recent alloc */ - unsigned int r_last_start; /* Start of most recent alloc */ - struct list_head r_lru; /* LRU list head */ - - unsigned int r_flags; -}; - -#define OCFS2_RESV_FLAG_INUSE 0x01 /* Set when r_node is part of a btree */ -#define OCFS2_RESV_FLAG_TMP 0x02 /* Temporary reservation, will be - * destroyed immedately after use */ -#define OCFS2_RESV_FLAG_DIR 0x04 /* Reservation is for an unindexed - * directory btree */ - -struct ocfs2_reservation_map { - struct rb_root m_reservations; - char *m_disk_bitmap; - - struct ocfs2_super *m_osb; - - /* The following are not initialized to meaningful values until a disk - * bitmap is provided. */ - u32 m_bitmap_len; /* Number of valid - * bits available */ - - struct list_head m_lru; /* LRU of reservations - * structures. */ - -}; - -void ocfs2_resv_init_once(struct ocfs2_alloc_reservation *resv); - -#define OCFS2_RESV_TYPES (OCFS2_RESV_FLAG_TMP|OCFS2_RESV_FLAG_DIR) -void ocfs2_resv_set_type(struct ocfs2_alloc_reservation *resv, - unsigned int flags); - -int ocfs2_dir_resv_allowed(struct ocfs2_super *osb); - -/** - * ocfs2_resv_discard() - truncate a reservation - * @resmap: - * @resv: the reservation to truncate. - * - * After this function is called, the reservation will be empty, and - * unlinked from the rbtree. - */ -void ocfs2_resv_discard(struct ocfs2_reservation_map *resmap, - struct ocfs2_alloc_reservation *resv); - - -/** - * ocfs2_resmap_init() - Initialize fields of a reservations bitmap - * @resmap: struct ocfs2_reservation_map to initialize - * @obj: unused for now - * @ops: unused for now - * @max_bitmap_bytes: Maximum size of the bitmap (typically blocksize) - * - * Only possible return value other than '0' is -ENOMEM for failure to - * allocation mirror bitmap. - */ -int ocfs2_resmap_init(struct ocfs2_super *osb, - struct ocfs2_reservation_map *resmap); - -/** - * ocfs2_resmap_restart() - "restart" a reservation bitmap - * @resmap: reservations bitmap - * @clen: Number of valid bits in the bitmap - * @disk_bitmap: the disk bitmap this resmap should refer to. - * - * Re-initialize the parameters of a reservation bitmap. This is - * useful for local alloc window slides. - * - * This function will call ocfs2_trunc_resv against all existing - * reservations. A future version will recalculate existing - * reservations based on the new bitmap. - */ -void ocfs2_resmap_restart(struct ocfs2_reservation_map *resmap, - unsigned int clen, char *disk_bitmap); - -/** - * ocfs2_resmap_uninit() - uninitialize a reservation bitmap structure - * @resmap: the struct ocfs2_reservation_map to uninitialize - */ -void ocfs2_resmap_uninit(struct ocfs2_reservation_map *resmap); - -/** - * ocfs2_resmap_resv_bits() - Return still-valid reservation bits - * @resmap: reservations bitmap - * @resv: reservation to base search from - * @cstart: start of proposed allocation - * @clen: length (in clusters) of proposed allocation - * - * Using the reservation data from resv, this function will compare - * resmap and resmap->m_disk_bitmap to determine what part (if any) of - * the reservation window is still clear to use. If resv is empty, - * this function will try to allocate a window for it. - * - * On success, zero is returned and the valid allocation area is set in cstart - * and clen. - * - * Returns -ENOSPC if reservations are disabled. - */ -int ocfs2_resmap_resv_bits(struct ocfs2_reservation_map *resmap, - struct ocfs2_alloc_reservation *resv, - int *cstart, int *clen); - -/** - * ocfs2_resmap_claimed_bits() - Tell the reservation code that bits were used. - * @resmap: reservations bitmap - * @resv: optional reservation to recalulate based on new bitmap - * @cstart: start of allocation in clusters - * @clen: end of allocation in clusters. - * - * Tell the reservation code that bits were used to fulfill allocation in - * resmap. The bits don't have to have been part of any existing - * reservation. But we must always call this function when bits are claimed. - * Internally, the reservations code will use this information to mark the - * reservations bitmap. If resv is passed, it's next allocation window will be - * calculated. It also expects that 'cstart' is the same as we passed back - * from ocfs2_resmap_resv_bits(). - */ -void ocfs2_resmap_claimed_bits(struct ocfs2_reservation_map *resmap, - struct ocfs2_alloc_reservation *resv, - u32 cstart, u32 clen); - -#endif /* OCFS2_RESERVATIONS_H */ |